JPH08197652A - Foamed slush molded shoe and its production - Google Patents

Abstract

PURPOSE: To provide a lightweight foamed slush molded shoe in which a part necessitating reinforcement such as a tiptoe part, a heel part and a sole part has sufficient strength and keeps the function of the shoe by constituting an outer layer of the thin filmlike heated gelled material of a plastisol and constituting an inner layer of the heated gelled material of a plastisol containing a foaming agent. CONSTITUTION: An inner layer 2 is constituted of a heated gelled material of plastisol. The inner layer 2 implys the part containing the whole from a hole part 3 of the lower part to a top part of the upper end. The inner layer 2 keeps strength and forms the framework of the body of a shoe and is constituted of the part 7 necessitating reinforcement such as a tiptoe part 5, a heel part 6 and a sole part 3 and of the other part 8. The inner layer 2 presents a foamed state in which a foaming agent contained in a plstisol is heated. Foaming is caused nearly uniformly in the whole part of the inner layer 2. An outer layer 10 is provided on the external surface of the inner layer 2. The outer layer 10 is constituted of the thin filmlike heated gelled material of the plastisol containing a polyvinyl chloride paste resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam slush molded shoe in which the whole or a part of a shoe body is foamed, and a method for producing the same.

[0002]

2. Description of the Related Art As shown in FIG. 11, a slush molded shoe made of polyvinyl chloride paste resin is first manufactured as an original model by making an actual shoe using a material such as leather or synthetic leather. A cylindrical slush molded shoe mold 31 having the shape of a shoe has been manufactured by an electroforming method in which the outer surface of the slab is metal-plated, and a polyvinyl chloride paste resin is poured into the slush molded shoe mold 31 thus manufactured. By heating the outer peripheral portion for a short time, a shoe gel-like semi-gelled product made of polyvinyl chloride paste resin is layered on the inner wall surface of the slush molded shoe mold 31, and then the ungelled material in the semi-gelated product is formed. The excess polyvinyl chloride paste resin in the activated state is discharged from the upper end opening 32 by inclining the slush molding shoe mold, for example. By heating to completely gelate the semi-gelled material in the slush molded shoe mold 31, so that the toe portion, the heel portion, the sole portion and the like need to be reinforced, and the other portions such as the shoe mouth portion and the tubular portion are A shoe main body (skin) 33 integrally formed with is manufactured.

After cooling and demolding, as shown in FIG. 12, a heel 35 manufactured in a separate process as an assembly component is attached to the heel portion of the shoe body 33 by, for example, bonding,
Further, a lining cloth (inner boot) sewn from a shoe lining material and parts such as an insole and a fastener are assembled to the shoe body 33 by sewing and adhering, and painting is performed to finish a slush molded shoe as a final product.

In the method of manufacturing a slush molded shoe shown in FIGS. 11 and 12, the heel 35 is mounted after the slush molding of the shoe body 33, but in addition to this, as shown in FIG. In the molding process, after discharging the surplus polyvinyl chloride paste resin in the ungelled state outside the slush molding mold, inject the heel paste into the inner heel of this semi-gelated product, and further the entire gelling temperature. There is also a manufacturing method in which the heel core 34 is integrally formed with the shoe body 33 by causing the semi-gelated product and the heel paste to gel together by heating above.

The slush-molded shoe manufactured in this manner was used on the inner surface of the slush-molded shoe mold because the slush-molded shoe mold manufactured by metal plating the outer surface of the original model was used. The material, stitches, and even the cut-out design are faithfully reproduced to give an excellent design expression, and since the shoe body is a complete tubular body with no seams or seams, it is highly waterproof and moisture-proof. Therefore, it has been commercialized in large quantities as cold boots such as boots.

By the way, the slush-molded shoe is heavy in weight because it uses a heat-gelled product of polyvinyl chloride paste resin in the shoe body, and the weight reduction is one of the most required requirements for footwear. There was a problem that it was difficult to achieve.

Therefore, various techniques for reducing the weight of slush molded shoes have been proposed so far.

For example, Japanese Patent Laid-Open No. 52-76151 discloses a mold for slush molded shoes by injecting a plastisol containing a polyvinyl chloride paste resin defoamed under reduced pressure into a heated slush molded shoe mold. The semi-gelled material is formed as an outer layer on the inner wall surface, the excess plastisol is discharged, and then the plastisol containing the mechanically foamed polyvinyl chloride paste resin is injected / discharged inside the semi-gelated material. A method has been proposed for producing a lightweight foam slush molded shoe having a two-layer structure including a solid outer layer and an inner layer containing air bubbles by forming an inner layer containing air bubbles and heating the whole.

Further, Japanese Patent Laid-Open No. 6-217801 discloses a vinyl chloride paste resin blended in an appropriate amount and a crosslinkable copolymer of a nitrile monomer and a methacrylic acid ester or an acrylic acid ester or an acrylic acid ester. A plastisol containing heat-expandable microcapsules is injected into a slush molding shoe mold, discharged and heated below the expansion temperature of the microcapsules to form a semi-gelling layer on the inner wall surface of the slush molding shoe mold. A method has been proposed for producing a foamed slush molded shoe in which each part of the shoe main body uniformly contains air bubbles by discharging excess plastisol and then heat-crosslinking the semi-gelled layer to a temperature above the expansion temperature of the microcapsules. .

[0010]

According to these conventional techniques, the foamed slush molded shoe contains air bubbles almost uniformly over the entire surface of the shoe body, so that the shoe body is lighter than the slush molded shoe having no air bubble in the shoe body. Can be realized.

[0011] However, in these conventional techniques, the reinforcement-requiring portions of the shoe body, such as the toes, the heel, and the sole, which require strength, are inevitably and unavoidably foamed, so that the reinforcement-requiring portions are formed. However, since air bubbles are included and the physical properties deteriorate, it is not possible to satisfy the required physical properties such as strength and wear resistance while reducing the weight.

It seems that it is easy to improve and secure the strength by increasing the wall thickness of the portion requiring reinforcement if a slight increase in weight is allowed. ， When the heating temperature is increased to thicken the portion requiring reinforcement of the semi-gelated product and slush molding is performed, the portion requiring reinforcement due to gelation due to the thickening at the time of heat gelation foaming has other portions requiring reinforcement. A larger amount of heat is required than the portion, and when a large amount of heat is applied, excessive foaming causes rough skin, open cells or collapse of bubbles, and the strength of the reinforcement-required portion rather decreases.

In addition to shoes, slush molding techniques for dolls and interior materials for automobiles are also known, but these have a foaming ratio of more than 500%, and when these are to be applied to shoes, The strength required for shoes cannot be maintained.

The present invention has been made in order to solve the problems of the prior art as described above, and the toe portion, the heel portion, and the sole portion of the shoe body, which require reinforcement, have sufficient strength. An object of the present invention is to provide a slush-molded shoe which has a function as a owned shoe and is light in weight, and a manufacturing method thereof.

[0015]

[Means for Solving the Problems] The inventors of the present invention have made extensive studies to solve the above problems, and in the case of performing slush molding using plastisol containing a polyvinyl chloride paste resin and a foaming agent, for slush molded shoes It was found that there is a difference between the heating conditions for sufficiently gelling the semi-gelled material formed on the inner wall surface of the mold and the heating conditions for thermally decomposing the foaming agent to generate gas. .

That is, in the usual case, the gelling temperature is 16
While the temperature is about 0 ° C., the decomposition temperature of the blowing agent of azo type, nitroso type, hydrazine type, etc. is about 200 ° C. Therefore, if the semi-gelled product is heated to a gelling temperature range below the foaming agent decomposition temperature, for example 160 to 180 ° C., even if it is above the gelling temperature, it is possible to perform sufficient gelation without foaming. On the other hand, if the temperature is equal to or higher than the decomposition temperature of the foaming agent, for example, 200 ° C. or higher, gelation naturally proceeds, and the foaming agent decomposes to generate gas even in a relatively short time. As described above, since foaming is completed in a relatively short period of time, but gelation proceeds slowly over a relatively long period of time, and therefore gelation and foaming are performed by heating to a high temperature region such as a foaming agent decomposition temperature or higher. If they are attempted to be performed at the same time, even if an appropriate foaming state is reached, gelation will be insufficient and the physical properties will deteriorate. Therefore, by supplementing this insufficient amount of gelation by heating in advance to a gelling temperature range where foaming does not occur, proper foaming can be performed without causing insufficient gelation. Furthermore, it is possible to adjust the temperature rate of foaming by using a stabilizer, a foaming accelerator, and a foaming inhibitor during compounding.

The inventors of the present invention have conducted further studies based on these findings or findings, and first of all, heat the semi-gelled material having a different wall thickness at each site to the gelling temperature range to advance the gelation, By partially controlling the heating temperature and the heating time after that, it was found that the foaming with a desired foaming ratio can be performed for each site, and the present invention was completed.

A foam slush molding shoe according to the present invention according to claim 1 includes an outer layer composed of a heat-gelled thin film of plastisol containing a polyvinyl chloride paste resin, the polyvinyl chloride paste resin and a foaming agent. A foam slush molded shoe in which a shoe body is composed of an inner layer composed of a heated gelation product of plastisol, wherein the inner layer is foamed, and the toe part, the heel part, the sole part, etc. of the inner layer are formed. It is characterized in that the thickness of the portion requiring reinforcement is greater than the thickness of other portions of the inner layer excluding the portion requiring reinforcement.

According to a second aspect of the present invention, there is provided a foamed slush molded shoe according to the first aspect of the present invention, wherein the outer layer is a reinforcement of the toe portion, the heel portion, the sole portion, etc. of the inner layer. It is characterized in that it is formed in a range that covers the necessary portion and the rear vertical wall surface.

A foam slush molded shoe according to a third aspect of the present invention is the foam slush molded shoe according to the first or second aspect, wherein the outer layer has a wall thickness of 0.5 mm or less. Is.

A foam slush molded shoe according to a fourth aspect of the present invention is the foam slush molded shoe according to any one of claims 1 to 3, wherein the plastisol constituting the outer layer contains a foaming agent. It is a feature.

A foam slush molded shoe according to a fifth aspect of the present invention is the foam slush molded shoe according to any one of the first to fourth aspects, wherein the inner layer has a foaming ratio of 200% or less. It is what

According to a sixth aspect of the present invention, there is provided a foam slush molded shoe according to any one of the first to fifth aspects, wherein the foaming slush molded shoe according to any one of the first to fifth aspects has a foaming ratio of all or a part of the necessary reinforcement portion. It is characterized by being smaller than the expansion ratio of the portion.

A foam slush molded shoe according to a seventh aspect of the present invention is the foam slush molded shoe according to any one of the first to sixth aspects, wherein the inner layer is injected into the inner heel portion in the slush molding step. In addition to having a heel core made of a heated gel of a paste for heels,
The foaming ratio of the bottom surface of the heel portion of the reinforcement-needed portion is smaller than the foaming ratio of the toe portion and the sole portion of the shoe, respectively.

According to an eighth aspect of the present invention, there is provided a foam slush molded shoe according to the seventh aspect, wherein the heel paste contains one or both of a heat-resistant hollow body and a foam inhibitor. It is characterized by containing.

In the method for producing a foam slush molded shoe according to a ninth aspect of the present invention, plastisol containing a polyvinyl chloride paste resin is injected into a slush molded shoe mold to a height required as a shoe body of the slush molded shoe. Then, by heating, the thin film-like semi-gelated product which is the outer layer is formed as a layer on the inner wall surface of the slush molding shoe mold, and the ungelled plastisol remaining on the inner surface of the semi-gelated product is discharged. In the first step, plastisol containing a polyvinyl chloride paste resin and a foaming agent is injected into the inside of the semi-gelled material to a height required as a shoe main body of a slush-molded shoe, and a portion to be the reinforcement required portion and the reinforcement required. By heating the parts other than the part with different heating conditions, the thickness of the part requiring reinforcement can be reduced. A shoe-gel-like semi-gelled product that is thicker than the other parts is layered as an inner layer on the inner wall surface of the semi-gelated product that is the outer layer, and the non-gelling that remains on the inner surface of the semi-gelated product that is the inner layer is formed. The second step of discharging the plastisol in the state, and heating the half-gelled substance as the inner layer and the half-gelled substance as the outer layer to a temperature range not lower than the gelling temperature and lower than the decomposition temperature of the foaming agent to progress gelation. The foaming agent is heated to a temperature above the decomposition temperature to cause foaming, and the outer layer formed by a thin gelled plastisol containing the polyvinyl chloride paste resin and the plastisol containing the polyvinyl chloride paste resin and the foaming agent are formed. The inner layer is made of a heat-gelated material, and the inner layer is foamed, and the thickness of the reinforcement-requiring portion is larger than that of the other portions. It is characterized in further comprising a third step of forming a shoe body.

According to a tenth aspect of the present invention, in the method for producing a foamed slush molded shoe, plastisol containing a polyvinyl chloride paste resin is placed inside the slush molded shoe mold, and the toe portion of the shoe body of the slush molded shoe is By injecting and heating to a height including a reinforcement required portion such as a heel portion and a shoe sole, a thin film semi-gelled product that is an outer layer is formed as a layer on the lower portion of the inner wall surface of the slush molded shoe mold, The first step of discharging the ungelled plastisol remaining on the inner surface of the semi-gelated product by tilting the slush molding shoe mold backward, and the plastisol containing the polyvinyl chloride paste resin and the foaming agent to the semi-gelated product. Injected into the inside of the slush molded shoe to the height required for the shoe body, and the portion that will become the reinforcement required portion, and the reinforcement required portion. Except that the heating conditions of the portions to be other portions are heated differently, whereby the thickness of the reinforcement-requiring portion is larger than the thickness of the other portion, and the semi-gelled product of the shoe body is the outer layer. The second step of forming a layer as an inner layer on the inner wall surface of the semi-gelated product and discharging the ungelled plastisol remaining on the inner surface of the semi-gelated product as the inner layer, and the semi-gelated product as the inner layer and the outer layer The semi-gelled product is a polyvinyl chloride paste resin, which is heated to a temperature range of a gelling temperature or higher and lower than a foaming agent decomposition temperature to promote gelation and then heated to a foaming agent decomposition temperature or higher for foaming. Consists of an outer layer composed of a thin gelled plastisol gel containing benzene and an inner layer composed of a heated gelled plastisol containing a polyvinyl chloride paste resin and a foaming agent The inner layer is foamed, the wall thickness of the reinforcement-requiring portion is larger than the wall thickness of the other portion, and the outer layer is the toe portion, heel portion, shoe sole portion, etc. of the inner layer. And a third step of forming a shoe main body formed in a range covering the reinforcement-required portion and the rear vertical wall surface.

In the foamed slush molded shoe according to the present invention as set forth in claim 11, plastisol containing polyvinyl chloride paste resin is injected into a mold for a slush molded shoe to a height required as a shoe main body of the slush molded shoe, and heated. By doing so, a thin film-like semi-gelled product that is an outer layer is formed as a layer on the inner wall surface of the slush molding shoe mold,
The first step of discharging the ungelled plastisol remaining on the inner surface of the semi-gelated product, and the plastisol containing the polyvinyl chloride paste resin and the foaming agent are required inside the semi-gelated product as the shoe body of the slush molded shoe. To a certain height, and by heating under different heating conditions for the portion that becomes the reinforcement-needed portion and the portion that becomes the other portion excluding the reinforcement-needed portion, the wall thickness of the reinforcement-needed portion becomes A semi-gelated product in the form of a shoe body having a thickness larger than the thickness of the part is formed as an inner layer on the inner wall surface of the semi-gelated product which is the outer layer, and the ungelled state which remains on the inner surface of the semi-gelated product which is the inner layer Second to discharge plastisol
Step, heating the semi-gelated product that is the inner layer and the semi-gelated product that is the outer layer to a temperature range not lower than the gelling temperature and lower than the decomposition temperature of the foaming agent to promote gelation, and then to reinforce the necessary reinforcement portion. By heating for a short period of time below the blowing agent decomposition temperature or above the blowing agent decomposition temperature and by heating the other portion above the above foaming agent decomposition temperature, a thin gelled gelled product of plastisol containing polyvinyl chloride paste resin is obtained. The outer layer is composed of an inner layer composed of a heat gelation product of plastisol containing a polyvinyl chloride paste resin and a foaming agent, wherein the inner layer has a foaming ratio higher than that of the other parts. The shoe body is formed by foaming so that the thickness of the necessary reinforcement portion is made larger than that of the other portions. That it is characterized in further comprising a third step.

In the foamed slush molded shoe according to the present invention as set forth in claim 12, a plastisol containing a polyvinyl chloride paste resin is placed inside a mold for a slush molded shoe, a toe portion, a heel portion and a shoe portion of the shoe body of the slush molded shoe. By injecting and heating to a height including a portion requiring reinforcement such as the sole of the shoe, the semi-gelled product in the form of a thin film that is an outer layer is formed as a layer on the lower part of the inner wall surface of the slush molded shoe mold, and the slush molded shoe is formed. The first step of discharging the ungelled plastisol remaining on the inner surface of the semi-gelated product by tilting the mold for casting backward, and plastisol containing a polyvinyl chloride paste resin and a foaming agent inside the semi-gelated product. Inject to the height required for the shoe body of the slush molded shoe, and remove the part that becomes the above-mentioned part requiring reinforcement and the part requiring reinforcement. By heating under different heating conditions for each of the other parts, the shoe-body-like semi-gelled product having the outer layer of the semi-gelled product in which the thickness of the reinforcement-required part is larger than the thickness of the other part Secondly, a layer is formed as an inner layer on the inner wall surface of the gelled product, and the ungelled plastisol remaining on the inner surface of the semi-gelated product which is the inner layer is discharged.
Step, heating the semi-gelated product that is the inner layer and the semi-gelated product that is the outer layer to a temperature range not lower than the gelling temperature and lower than the decomposition temperature of the foaming agent to promote gelation, and then to reinforce the necessary reinforcement portion. By heating for a short period of time below the blowing agent decomposition temperature or above the blowing agent decomposition temperature and by heating the other portion above the above foaming agent decomposition temperature, a thin gelled gelled product of plastisol containing polyvinyl chloride paste resin is obtained. The outer layer is composed of an inner layer composed of a heat gelation product of plastisol containing a polyvinyl chloride paste resin and a foaming agent, wherein the inner layer has a foaming ratio higher than that of the other parts. The thickness of the reinforcement-requiring portion is made larger than that of the other portion, and Includes a third step of forming a shoe main body formed in a range that covers a portion requiring reinforcement such as a toe portion, a heel portion, and a shoe sole portion of the inner layer and a rear vertical wall surface. is there.

According to a thirteenth aspect of the present invention, there is provided a method for producing a foam slush molded shoe according to any one of the ninth to twelfth aspects, wherein the plastisol constituting the outer layer is foamed. It is characterized by containing an agent.

According to a fourteenth aspect of the present invention, there is provided a method for producing a foam slush molded shoe according to a third aspect of the method for producing a foam slush molded shoe according to any one of the ninth to thirteenth aspects.
In the step, before heating the semi-gelated product to a temperature range not lower than the gelling temperature and lower than the foaming agent decomposition temperature, by injecting a heel paste into the inner heel of the semi-gelated product, the third step is performed. It is characterized in that the foaming ratio of the bottom surface of the heel part of the formed shoe body is made smaller than the foaming ratio of the toe part and the sole part of the shoe.

According to a fifteenth aspect of the present invention, there is provided a method for manufacturing a foam slush molded shoe according to the fourteenth aspect, wherein the heel paste is a heat-resistant hollow body and a foaming inhibitor. One or both are contained.

[0033]

First, the foamed slush molded shoe according to the present invention will be described in detail with reference to the attached drawings together with the operation and effect.

(1) Foam slush molding shoe according to claim 1 FIG. 1 is a longitudinal sectional view showing the structure of a foam slush molding shoe according to the present invention.

The foamed slush molded shoe 1 is made of a heat-gelated plastisol containing a polyvinyl chloride paste resin and a foaming agent, and has an inner layer 2 which functions as a shoe body.

The polyvinyl chloride paste resin used for the inner layer 2 is generally a resin obtained by a polymerization method such as emulsion polymerization or microsuspension of vinyl chloride monomer, vinyl chloride and vinyl acetate, vinylidene chloride, ethylene, A resin obtained by copolymerization with propylene or the like, or a polyvinyl chloride paste resin having a hydroxyl group (-OH) or a carboxyl group (-COOH) in the molecule and having a crosslinkability can be used, and the degree of polymerization is from 1000 to 20
An example is a paste resin of about 00.

The foaming agent is an azo compound such as azodicarbonamide, azobisformamide, azobisisobutyronitrile, azohexahydrobenzonitrile, diazoaminobenzene, dinitrosopentamethylenetetramine, N,
Nitroso compounds such as N'dinitroso-N, N'-dimethylterephthalamide, benzenesulfonylhydrazide, toluenesulfonylhydrazide, diphenylsulfone-3,3 '
-Disulfonyl hydrazide, diphenyl oxide-4,4 '
-Examples of hydrazide compounds such as disulfonyl hydrazide, organic chemical foaming agents such as terephthalazide, P-toluenesulfonyl semicarbazide, trihydrazinotriazine and inorganic chemical foaming agents such as sodium bicarbonate, ammonium bicarbonate and ammonium carbonate can do.

The above-mentioned plastisols are usually used in addition to these polyvinyl chloride paste resins and foaming agents,
Since they include a plasticizer, a stabilizer, and a pigment, these are also described.

As the plasticizer, DOP, DIDP, DH
Examples include various plasticizers such as phthalic acid ester-based compounds such as P and DBP, adipic acid ester-based compounds, polyester-based compounds, and epoxy-based compounds.

Examples of the stabilizer include organic tin-based stabilizers such as dibutyltin dilaurate and dibutyltin malate, tin mercapto-based, Ba-based, Zn-based, Ca-based and composites thereof. In addition, in the present invention, since it is used by being contained in a plastisol together with a foaming agent, depending on the kind of the metal element used for the stabilizer, it affects the foaming agent decomposition temperature and foamability in addition to the heat stability which is the original purpose of use. Therefore, care must be taken when selecting the metal element used for the stabilizer. Specifically, tin or Ba suppresses foaming, and Zn, P
Since b, Cd, etc. accelerate foaming and lower the decomposition temperature of the foaming agent, it is desirable to use a composite stabilizer mainly composed of Zn and mixed with other stabilizers.

The pigment is selected according to the color given to the shoe body, and examples thereof include inorganic pigments such as titanium oxide, red iron oxide, carbon black, and watching red, phthalocyanine, and azo organic pigments.

The composition of the plastisol containing these is
Foaming agent: 0.01 to 1.0 part by weight, plasticizer: 80 to 100 relative to 100 parts by weight of polyvinyl chloride paste resin
Parts by weight, stabilizer: 3 to 5 parts by weight, pigment: 1 to 3 parts by weight.

The inner layer 2 is composed of a heat-gelated plastisol having such a composition. Here, the inner layer 2 means a portion including everything from the bottom shoe sole 3 to the upper end mouth portion 4, and the inner layer 2 maintains the strength to form the skeleton of the shoe body, and the toe portion 5, The heel portion 6 and the sole portion 3 of the shoe sole 3 and the like need to be reinforced, and the other portion 8 excluding the reinforcement required portion 7 is included. The toe portion 5 means at least a portion including a hood covering from the tip of the shoe body to a line connecting the center points on the shin side to the calf side, and may further include a hood covering portion of the instep portion. The heel portion 6 means a portion including at least the heel point, and may further include an Achilles tendon equivalent portion or the like. Further, the shoe sole 3 means a portion including at least the entire area of the ground contacting surface, and may include the periphery of the shoe sole rising from the ground contacting surface. Further, the heel portion 6 also includes a heel portion having a stepped portion on the bottom surface for retrofitting a heel lift or a fitting spike for improving comfort and wear resistance.

The inner layer 2 exhibits a foamed state by heating the foaming agent contained in the plastisol. As for foaming, the entire part of the inner layer 2 is foamed substantially uniformly. That is, there is no great difference in the degree of foaming between the above-mentioned reinforcement-needed portion 7 and the other portion 8, and they are foamed to a substantially uniform degree.

Further, the toe portion 5 and the heel portion 6 of the inner layer 2
The wall thickness of the reinforcement-requiring portion 7 such as the shoe sole 3 is larger than the wall thickness of the other portion 8 of the inner layer 2 excluding the reinforcement-requiring portion 7. That is, in the foam slush molded shoe 1 according to claim 1, the inner layer 2 is foamed substantially uniformly regardless of the parts, and the overall weight is reduced, and the thickness of the reinforcement-requiring portion 7 of the inner layer 2 is increased. Necessary strength is maintained.

Incidentally, in order to make the thickness of the reinforcement-needed portion 7 larger than that of the other portions, it will be described in detail when the method of manufacturing the foamed slush molded shoe according to the present invention is described. As described above, in the semi-gelling step in the slush molding step, heating conditions (one or both of heating temperature and heating time) are changed between the reinforcement-requiring portion 7 and the other portion 8 within a specific range.

Further, in the foam slush molded shoe 1 shown in FIG. 1, an outer layer 10 made of a heat-gelled thin film of plastisol containing polyvinyl chloride paste resin is provided on the outer surface of the inner layer 2.

The polyvinyl chloride paste resin contained in the plastisol constituting the outer layer 10 is exactly the same as the above-mentioned polyvinyl chloride paste resin contained in the plastisol constituting the inner layer 2, that is, the inner layer 2 and the outer layer 10. It is desirable from the viewpoint of maintaining sufficient adhesion strength.

The plastisol constituting the outer layer 10 contains a plasticizer, a stabilizer, a pigment and the like in addition to the polyvinyl chloride paste resin. These compounding examples are based on 100 parts by weight of the polyvinyl chloride paste resin. Plasticizer: 80-1
00 parts by weight, stabilizer: 3 to 5 parts by weight, pigment: 1 to 3 parts by weight.

As described above, in the foam slush molded shoe 1 according to the present invention having the inner layer 2 and the outer layer 10, the inner layer 2 is foamed to reduce the weight and the foamed portion has a heat insulating effect. Therefore, the heat retention property is improved. In addition, foaming softens the feel and improves comfort. In addition, the inner layer 2 is foamed so that the inner layer 2
In addition to the leather pattern design on the surface of the leather, small wrinkles of leather calf are formed to give a high-class feeling, but since the inner layer 2 is protected by the outer layer 10 formed as a thin film on the outer surface, the surface of the inner layer 2 Scratch resistance of the leather pattern design and small wrinkles of leather calf that are formed on the surface is improved. Further, since the same material as that of the conventional slush molded shoe is formed by using the foaming agent, it can be manufactured at low cost.

In the foamed slush molded shoe 1 according to the first aspect of the present invention, the skeleton of the shoe body is the inner layer 2, and the outer layer 10 acts as a surface protective film (skin) of the inner layer 2. However, the increase in the wall thickness also has an effect of improving the strength of, for example, the rear vertical wall surface 11 of the shoe body, although the thickness is considerably small.

(2) Foam slush molding shoe according to claim 2 FIG. 2 is a longitudinal sectional view showing the structure of the foam slush molding shoe 1 ′ according to claim 2. The difference from the foam slush molded shoe 1 according to claim 1 shown in FIG. 1 is that the outer layer 10 is not formed on the entire outer surface of the inner layer 2, but the toe portion 5, the heel portion 6 and the shoe sole portion 3 of the inner layer 2. This is a point that is a range that covers the reinforcement required portion 7 and the rear vertical wall surface 11.

Here, the rear vertical wall surface 11 is an outer surface of the slush molded shoe 1'when the mold for the slush molded shoe is tilted backward in the slush molding step to discharge excess ungelled sol inside. The outer surface formed by the ungelled sol flowing and discharged into contact with the inner wall surface of the rear part of the slush molding shoe mold.

That is, in the foam slush molded shoe 1'shown in FIG. 2, compared with the foam slush molded shoe 1 shown in FIG. 1, the formation range of the outer layer 10 for protecting the inner layer 2 needs to improve scratch resistance. Is limited to a certain range. Further, the outer layer 10 is thin because it is a thin film, but due to the increased thickness, the toe part 5 and the heel part 6
Also, the effect of increasing the strength of the reinforcement required portion 7 such as the shoe sole 3 and the rear vertical wall surface 11 is achieved.

(3) Foam slush molded shoe according to claim 3 The foam slush molded shoe 1 according to claim 1 shown in FIG. 1 or the foam slush molded shoe 1 according to claim 2 shown in FIG.
In the case of ′, if the thickness of the outer layer 10 exceeds 0.5 mm, the weight reduction effect is reduced accordingly, and the leather pattern design and the small wrinkles of the leather kerf formed on the surface of the inner layer 2 are covered. Therefore, the thickness of the outer layer 10 is preferably 0.5 mm or less. From this point of view, it is not necessary to set the lower limit of the wall thickness of the outer layer 10, but if it is too thin, the protective effect of the inner layer 2 is insufficient, so the lower limit of the wall thickness of the outer layer 10 is 0.
It is preferably 1 mm or more. Here, the “wall thickness” of the outer layer 2 excludes, for example, the convex portion that constitutes the shoe sole design portion,
This means the so-called base thickness.

(4) Foam slush molded shoe according to claim 4 In the foam slush molded shoe according to any one of claims 1 to 3, from the viewpoint of further promoting the weight reduction, the plastisol constituting the outer layer 10 is formed. May contain a foaming agent.

The kind of the foaming agent may be the same as the foaming agent contained in the plastisol constituting the inner layer 2 described above, and the description thereof is omitted here. Polyvinyl chloride paste resin 10
When the content of the foaming agent exceeds 0.3 parts by weight with respect to 0 parts by weight, foaming on the surface of the outer layer 10 becomes remarkable and the inner layer 2
Therefore, the content of the foaming agent is preferably 0.3 parts by weight or less with respect to 100 parts by weight of the polyvinyl chloride paste resin, and is 0.1 parts by weight or less from the same viewpoint. Is desirable.

(5) Foamed slush molded shoe according to claim 5 The foaming ratio showing the degree of foaming is calculated by (thickness after foaming) / (thickness before foaming) × 100 (%). When the expansion ratio exceeds 200%, the weight-reducing effect is increased, but the strength of the inner layer 2 is significantly reduced, and the slush molded shoe 1
As a result, the necessary strength may not be maintained. Therefore, as in the foam slush molded shoe according to the fifth aspect, it is desirable that the expansion ratio is 200% or less. From the viewpoint of ensuring the strength required for the inner layer 2, it is not necessary to set a lower limit of the expansion ratio, but the weight reduction effect decreases as the expansion ratio decreases, so it is desirable not to set it to an extremely low value. . From this point of view, it is most desirable that the expansion ratio is, for example, 105% or more and 140% or less.

(6) Foam slush molded shoe according to claim 6 This foam slush molded shoe is the foam slush molded shoe according to any one of claims 1 to 5, for example, the claim 1 shown in FIG. Foam slush molding shoes 1
Alternatively, in the foam slush molded shoe 1 ′ according to claim 2 shown in FIG. 2, the expansion ratio of all or a part of the reinforcement-needed portion 7 is smaller than the expansion ratio of the other portion 8. That is, at least a part of the reinforcement-requiring portion 7 such as the toe portion 5, the heel portion 6, the shoe sole portion 3 and the like has a larger wall thickness and a smaller foaming ratio than the other portion 8, so that the strength is increased. Is significantly increased, and the inner layer 2 has a structure sufficiently provided with the required function.

(7) Foam slush molding shoe according to claim 7 Fig. 3 is a longitudinal sectional view showing the structure of the foam slush molding shoe according to claim 1 based on the foam slush molding shoe according to claim 1. FIG. 4 is a longitudinal sectional view showing the structure of the foam slush molded shoe 1 ′ ″ according to claim 7 based on the foam slush molded shoe according to claim 2.

The foam slush molded shoes 1 ″, 1 ′ ″ according to claim 7 are the above-mentioned claims 1 to 6.
In the foam slush molded shoe 1 according to any one of
The inner layer 2 includes a heel core 9 made of a heat-gelated product of the heel paste injected in the slush molding step on the inner surface heel portion.

The heel core 9 is formed on the inner surface of the semi-gelled material which becomes the inner layer 2 in the step of heat gelling the inner layer 2 (the third step of the manufacturing method according to any one of claims 9 to 12 described later). It is a heated gel of a heel paste that is poured into the bottom.

The composition of the heel paste may be appropriately determined in consideration of the hardness after heat gelation, the volume change rate due to heating, and the adhesion strength with the inner layer 2, and it is necessary to limit it to a specific type. There is no. As an example, with respect to 100 parts by weight of polyvinyl chloride paste resin, plasticizer: 70 parts by weight, thermosetting plasticizer: 20 parts by weight, catalyst: 0.2 parts by weight, stabilizer: 1 part by weight, pigment: 1 A weight part can be illustrated. Here, since the polyvinyl chloride paste resin, the plasticizer, the stabilizer, and the pigment are the same as those contained in the plastisol constituting the shoe body, the description thereof is omitted here and the thermosetting plastic is omitted. The agent and the catalyst will be described.

The following can be used as the thermosetting plasticizer used in the heel paste.

Allyl ester type thermosetting plasticizers: diallyl phthalate, allyl acrylate, triallyl tereate, diallyl maleate, dichloroallyl maleate, diallyl itaconic acid, diallyl sebacate, diallyl adipate, diallyl malonate, glycolic acid. Diallyl, triallyl aconitate, triallyl phosphate, etc.

Acrylic ester type thermosetting plasticizer Allyl methacrylate, diallyl fumarate, triethylene glycol dimethacrylate, ethylene glycol dimethacrylate, cyclohexyl methacrylate, tetraethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, butane 1,4 diol dimethacrylate, trimethylolpropane trimethacrylate,
Trimethylolpropane triacrylate, trimethylolpropane propylene oxide adduct triacrylate, dimethylaminoethyl methacrylate, 1,3 butylene glycol dimethacrylate, etc.

Unsaturated Polyester Thermosetting Plasticizer Radical polymerization is carried out by heating a linear polyester having some double bonds in the molecule.

Epoxy Thermosetting Plasticizer A curing agent such as an aliphatic amine or an acid anhydride is added to a long-chain or cyclic aliphatic epoxy resin to cure it.

In particular, an allyl ester type thermosetting plasticizer,
Acrylic ester-based thermosetting plasticizers include benzoyl peroxide (BPO), t-butyl perbenzoate (TBPB), dicumyl peroxide (DC) as polymerization catalysts.
PO), cumene hydroperoxide (CHPO), etc. are added and heated to radically polymerize and cure.

The thermosetting plasticizer and catalyst used in the heel paste may be appropriately selected from the above. In the examples described later, trimethylolpropane trimethacrylate is used as the thermosetting plasticizer and t-butyl is used as the catalyst. Perbenzoate (TBPB) was used.

Furthermore, the foam slush molded shoe 1 ″ shown in FIG. 3 or the foam slush molded shoe 1 ′ ″ shown in FIG.
The heel portion 6 of the reinforcement-requiring portion 7 with which the heel core 9 contacts
The foaming ratio of the bottom surface is smaller than that of each of the toe part 5 and the shoe sole part 3. Therefore, the expansion ratio of the bottom surface of the heel portion 6 of which the strength is particularly required is smaller than the expansion ratios of the toe portion 5 and the shoe sole portion 3 among the reinforcement necessary portions 7. Therefore, the expansion ratio of the bottom surface of the heel portion 6 of which the strength is particularly required can be made smaller than that of the toe portion 5 and the shoe sole portion 3 among the reinforcement-requiring portions 7, in other words, the expansion ratio of the bottom surface of the heel portion 6 is the inner layer. It can be made the smallest of the two, and the strength of the bottom surface of the heel portion 6 can be secured.

(8) Foam slush molded shoe according to claim 8 In this foam slush molded shoe according to claim 7, the heel paste constituting the heel core 9 has heat resistance in the foam slush molded shoe according to claim 7 described above. One or both of the hollow body and the foaming inhibitor are contained.

By including the hollow body, the weight of the heel core 9 which is a heat-gelled product of the heel paste can be reduced. As a means for reducing the weight of the heel core 9, it is possible to include a foaming agent in the heel paste,
When foaming by heating, the heel paste injected into the inner bottom surface of the semi-gelated product may expand in a convex shape, and it may not be possible to maintain the predetermined shape of the heel core 9 whose upper end surface is substantially linear. Further, as will be described later, when a foaming inhibitor is contained, there is a problem that foaming cannot be performed by the foaming agent. If it is a hollow body, such a problem does not occur.

On the other hand, by containing the foaming inhibitor, it is possible to suppress the foaming ratio of the bottom surface of the heel portion 6 of the inner layer 2 in contact with the heel paste, and further improve the strength of the heel portion 6. Like

Examples of the hollow body include shirasu balloon, silica balloon, glass balloon, carbon balloon, alumina balloon, vinylidene chloride balloon, phenol balloon and the like.

As the foaming inhibitor, maleic acid,
Organic acids such as fumaric acid and 1,2-phthalic acid Stearoyl chloride, halogenated organic acids such as phthaloyl chloride, maleic anhydride, phthalic anhydride, trimellitic anhydride, and other organic acid anhydrides; Nitrogen-containing substances such as alcohols, fatty acid amines, amides and oximes, sulfur-containing substances such as mercaptans, sulfides and isocyanates, phosphates such as phosphite chloride, tin compounds such as dibutyltin malate, tin chloride and tin sulfate. Other examples include hexachlorocyclopentadiene.

The composition of the heel paste containing the hollow body and the foaming inhibitor is, for example, plasticizer: 70 parts by weight, thermosetting plasticizer: 20 parts by weight, based on 100 parts by weight of polyvinyl chloride paste resin. Examples include catalyst: 0.2 parts by weight, stabilizer: 1 part by weight, hollow body: 10 parts by weight, foaming inhibitor: 5 parts by weight, pigment: 1 part by weight.

Next, a method for manufacturing the foamed slush molded shoe according to the present invention will be described in detail with reference to the attached drawings together with operational effects for each claim.

(9) Method for manufacturing foam slush molded shoe according to claim 9 Fig. 5 is an explanatory view schematically showing a method for manufacturing a foam slush molded shoe according to claim 9.

(First Step) First, as shown in FIG. 5A, the plastisol 12 as an outer layer containing the polyvinyl chloride paste resin having the composition described in the above (1) is placed inside the slush molding shoe mold 13. Inject the slush molded shoe to the required height as the shoe body. Normally, the required height is up to the vicinity of the upper end opening 14 of the slush molded shoe mold 13.

Then, as shown in FIG. 5B, after the injection, the entire injected plastisol 12 is heated substantially uniformly for a short time. For example, the heating conditions are 100 to 120 ° C × 10 to 3
0 seconds.

By performing the heating in this way, FIG.
As shown in (c), a semi-gelated product 15 in the form of a shoe body and in the form of a thin film is layered on the inner wall surface of the slush-molded shoe mold 13. The thickness of the semi-gelated material 15 will be described later.
Also in the method for manufacturing the foam slush molded shoe according to any one of claims 0 to 12, it is desirable that the foam slush molded shoe according to claim 3 has a thickness of 0.5 mm or less.

After that, inside the semi-gelated material 15,
Since the surplus plastisol 12 in an ungelled state remains, as shown in FIG. 5D, the surplus plastisol 12 is slush molded by an appropriate means such as tilting the slush molding shoe mold 13. Discharge to the outside of the shoe mold 13.

In FIG. 5 and FIGS. 7 and 9 to be described later, the surplus plastisol is discharged by inclining the slush-molding shoe mold 13 rearward.
Unlike FIG. 8 or FIG. 10, the discharging means does not require any limitation. For example, the slush molding shoe mold 13 is used.
The surplus plastisol may be discharged by inclining forward or sucking with a suction device. However, as shown in FIG. 6, FIG. 8 or FIG. 10, in the first step, when plastisol 12 is injected to the reinforcement-required portion of the shoe body of the slush-molded shoe, such as the toe, heel and shoe sole. As shown in FIG. 6, FIG. 8 or FIG. 10, by leaning the slush molded shoe mold 13 backward and discharging the surplus plastisol 12, a thin film semi-gelated product is also formed on the rear vertical wall of the slush molded shoe. It is desirable to form a layer.

(Second Step) Next, as shown in FIG. 5E, the plastisol 16 containing the polyvinyl chloride paste resin having the composition described in the above item (1) and the foaming agent is converted into a semi-gelated product 15. Pour inside to the height required for the shoe body of the slush molded shoe.

Then, as shown in FIG. 5 (f), after the injection, of the injected plastisol 16, a portion 16a which will be the toe portion of the shoe body, a portion 16b which will be the heel portion, a portion 16c which will be the sole portion, and the like. A portion 16d that is a portion that is a reinforcement-requiring portion, and a portion that is the other portion except the reinforcement-requiring portion
The heating conditions (one or both of the heating temperature and the heating time) are different, and heating is performed at a temperature higher than the semi-gelation temperature and lower than the gelation temperature so that a large amount of heat is supplied to the portion that is the reinforcement required portion. For example, the part that needs to be reinforced: 100
℃ × 5 to 7 minutes, other parts: 100 ℃ ×
It heats on the heating conditions for 1-2 minutes.

The means for heating with different heating conditions for the portion to be reinforced and the heating conditions for the other portions need not be limited to specific means. For example, a means for heating by appropriately adjusting the arrangement and temperature of the heating device provided on the furnace wall of the heating furnace for heating the slush molding shoe mold 13 into which the plastisol 16 is injected can be exemplified.

As described above, by heating under different heating conditions between the portion to be the reinforcement required portion and the portion to be the other portion, as shown in FIG. A shoe-gel-like semi-gelled material 19 having a wall thickness larger than that of the other portion 18 is layered on the inner wall surface of the semi-gelated material 15.

Thereafter, the inside of the semi-gelled material 19 is
Since the unplastified surplus plastisol 16 remains, as shown in FIG. 5 (h), the surplus plastisol 16 is treated with an appropriate means such as inclining the slush molding shoe mold 13 to form a half gel. Compound 19 is discharged to the outside.

(Third step) As shown in FIG. 5 (i), the shoe-body-like semi-gelated product 19 formed on the inner wall surface of the thin film-like semi-gelated product 15 is decomposed by the foaming agent at a temperature not lower than the gelling temperature. The gelation proceeds by heating to a temperature range below the temperature. The gelling may be completed, or may be completed only with the subsequent heating to the decomposition temperature range of the blowing agent.

That is, there is a difference between the gelling temperature at which the semi-gelled material 19 is sufficiently gelled and the decomposition temperature of the foaming agent at which the foaming agent is decomposed by heating to generate gas. In case of, gelation temperature: about 16
0 ° C, blowing agent decomposition temperature: about 180 ° C.

Therefore, by heating the semi-gelled material 19 in a temperature range not lower than the gelling temperature and lower than the decomposition temperature of the foaming agent, preferably for a long time, the amount of heat received by each part of the semi-gelled material 19 increases without the foaming agent foaming. The gel can then proceed.

The heating may be carried out under the same heating conditions for the entire semi-gelated product 19, but the thickness of the semi-gelated product 19 differs between the reinforcement-needed portion 17 and the other portion 18, and Since the amount of heat required for gelation in the thick portion 17 is naturally larger than that in the thin portion 18, for example, the reinforcement required portion 17: 170 ° C. for 3 to 4 minutes, the other portion 18:
160 ° C x 3-4 minutes, or part requiring reinforcement 17:17
0 ° C x 3-4 minutes, other part 18: 170 ° C x 2
It is desirable that the heating condition is such that the amount of heat supplied to the reinforcement-requiring portion 17 is large, such as 3 minutes. The means for making the heating conditions for the reinforcement-requiring portion 17 different from the heating conditions for the other portions 18 need not be limited to the specific means as described above.

In this way, as shown in FIG. 5 (j), the thin-film heat-gelated material 20 as the outer layer and the reinforcement-needed portion 17 are thicker than the other portions 18 and foam. An inner layer, which is not heated, is formed with the heated gelation product 21.

Next, as shown in FIGS. 5 (k) and 5 (l), by heating the inner layer to a temperature above the decomposition temperature of the foaming agent, preferably for a short time, when gelation is not completed, When the gelation is completed, the foaming agent is decomposed by heating to generate gas and foam. It should be noted that when the temperature of the reinforcement-requiring portion 17 reaches the foaming agent decomposition temperature, foaming begins, and when the temperature rises for a long time, the expansion ratio also increases in the reinforcement-requiring portion 17, eventually resulting in over-foaming and collapse of bubbles and rough skin. Since it becomes difficult to maintain the strength required as the inner layer, the heating temperature and the heating gel temperature are set so that the expansion ratio of the heat-gelated product 21 which is the inner layer is 200% or less like the foam slush molded shoe according to claim 5. It is desirable to adjust one or both of the heating times.

In this way, a thin film gelled product 2 of plastisol 12 containing polyvinyl chloride paste resin is obtained.
0 and an inner layer composed of a heated gelation product 21 of plastisol 16 containing a polyvinyl chloride paste resin and a foaming agent constitute a shoe body, and the inner layer is foamed and the toe of the inner layer is formed. The thickness of the reinforcement-requiring portion 17 such as the heel portion, the heel portion, and the sole of the shoe is made larger than the thickness of the other portion 18 of the inner layer excluding the reinforcement-requiring portion 17, Manufactured.

Thereafter, after cooling and demolding, a heel separately manufactured as one of the parts to be assembled is attached to the outer heel of the heat-gelated product 20 as the outer layer by, for example, adhesion, and then the shoe body is clothed with the shoe sole cloth. The slush molded shoe is the final product by assembling the back cloth sewn from the material and the parts such as the insole and the fastener by sewing and adhering, and painting.

(10) Method for manufacturing foam slush molded shoe according to claim 10 Fig. 6 is an explanatory view schematically showing a method for manufacturing a foam slush molded shoe according to claim 10.

(First Step) First, as shown in FIG. 6A, the plastisol 12 as an outer layer containing the polyvinyl chloride paste resin having the composition described in the above (1) is placed inside the slush molding shoe mold 13. Pour into the height of the shoe body of the slush-molded shoe, including the toes, heels, soles, and other parts that require reinforcement.

Then, as shown in FIG. 6B, after the injection, the entire injected plastisol 12 is heated substantially uniformly for a short time. For example, the heating conditions are 100 to 120 ° C × 10 to 3
0 seconds.

By performing the heating in this way, FIG.
As shown in (c), a semi-gelated product 15 in the form of a shoe body and in the form of a thin film is formed on the lower portion of the inner wall surface of the slush-molded shoe mold 13 as a layer.

After this, inside the semi-gelated material 15,
Since the unplastified surplus plastisol 12 remains, as shown in FIG. 5 (d), the surplus plastisol 12 is tilted backward to the slush molding shoe mold 13 to form a slush molding shoe mold. 13 Discharge to the outside. At this time, the surplus ungelled sol 12 which is fluidized and discharged by the backward inclination of the slush molding shoe mold 13 is
The thin gel semi-gel material 15 is formed on the rear vertical wall surface 15a of the rear upper part of the inner layer in contact with the rear inner wall surface of the slush molded shoe mold 13 in the heated state.

(Second Step and Third Step) The second step and the third step are exactly the same as the second step and the third step in the method for manufacturing a foam slush molded shoe according to claim 9 shown in FIG. Therefore, the description here is omitted.

Thus, as shown in FIG. 6 (l), the plastisol 1 containing the polyvinyl chloride paste resin was used.
The shoe body is composed of an outer layer composed of the heat-gelled material 20 in the form of a thin film 2 and an inner layer composed of the heat-gelled material 21 of plastisol 16 containing a polyvinyl chloride paste resin and a foaming agent, and the inner layer is foamed. Of the inner layer, the toe part 25, the heel part 24 and the shoe sole part 2
The thickness of the reinforcement-requiring portion 17 such as 6 is made thicker than the thickness of the other portion 18 of the inner layer excluding the reinforcement-requiring portion 17, and the heated gelation product 20 as the outer layer is the toe portion of the inner layer. 25, a shoe body constituting a foamed slush molded shoe formed in a range covering the reinforcement necessary portion 17 such as the heel portion 24 and the shoe sole portion 26 and the rear vertical wall surface 15a is manufactured.

Thereafter, after cooling and demolding, a heel separately manufactured as one of the parts to be assembled is attached to the outer surface heel of the heat-gelated material 20 which is the outer layer, for example, by adhesion, and then the shoe body is covered with a shoe cloth. The slush molded shoe is the final product by assembling the back cloth sewn from the material and the parts such as the insole and the fastener by sewing and adhering, and painting.

(11) Manufacturing method of foam slush molded shoe according to claim 11 Fig. 7 is an explanatory view schematically showing a manufacturing method of the foam slush molded shoe according to claim 11.

(First Step to Third Step (j)) The first step to the third step (j) are the first step to the third step of the foamed slush molded shoe according to the present invention according to claim 9 shown in FIG. Since it is exactly the same as the 3rd step (j), the description thereof is omitted here.

(Third step (k) and third step (l))
As shown in FIGS. 7 (k) and 7 (l), the toe part 25 and the heel part 2 of the inner layer 21 obtained in the third step (j) are used.
4 and the sole-requiring portion 17 such as the shoe sole 26 are heated for a short time below the blowing agent decomposition temperature or above the blowing agent decomposition temperature, and the other portion 18 of the inner layer 21 excluding the reinforcement-necessary decomposition temperature 18 is blown by the blowing agent decomposition temperature. More preferably, it is heated for a short time. As for the heating conditions, the reinforcement required part 17: 1
70-180 ° C x 2-3 minutes, other part 18:20
An example is 0 to 210 ° C. for 2 to 3 minutes.

The means for heating the heating condition of the reinforcement required portion 17 and the heating condition of the other portion 18 differently are not limited to specific means. For example, heating may be performed by appropriately adjusting the arrangement and temperature of the heating device on the furnace wall of the heating furnace that heats the slush-molding shoe mold 13 having the inner surface of which the gelled product is formed.

The reinforcement-needed portion 17 hardly foams because it is heated below the foaming agent decomposition temperature, while the other portion 18 foams when the foaming agent is thermally decomposed and gas is generated. In addition,
When the temperature of the reinforcement-requiring portion 17 reaches the foaming agent decomposition temperature, foaming starts, and when the temperature rises for a longer time, the expansion ratio increases, and eventually over-foaming results in collapse of the cells and rough skin, and the strength required for the inner layer. Since it may be difficult to maintain the above, it is desirable to adjust the heating time so that the expansion ratio of each part of the inner layer is 200% or less as in the foamed slush molded shoe according to the fifth aspect.

As described above, by heating the reinforcing required portion 17 and the other portion 18 at different heating temperatures,
As shown in FIG. 7 (l), all or part of the reinforcement-requiring portion 17 such as the toe portion 25, the heel portion 24, and the shoe sole portion 26 is non-foamed (foaming ratio: 100%) or low foaming (foaming ratio: 100). % And 200% or less), and the other portion 18 is expanded to have a foaming ratio of more than 100% and 200% or less, and the foaming ratio (for example, 120%) of all or a part of the reinforcement-requiring portion 17 is the other portion 18. Is smaller than the expansion ratio (for example, 180%). Therefore, the strength of the reinforcement-requiring portion 17 is further improved together with the large wall thickness.

In this way, a thin film gelled product 2 of the plastisol 12 containing the polyvinyl chloride paste resin is obtained.
0 and an inner layer made of a heat-gelled plastisol 16 containing a polyvinyl chloride paste resin and a foaming agent, and the inner layer has a foaming ratio of all or a part of the reinforcement required portion 17 The portion 18 is expanded so that the expansion ratio is smaller than that of the portion 18, and the wall thickness of the reinforcement required portion 17 is
The shoe body constituting the slush-molded shoe according to claim 6, which is made thicker than the wall thickness of the shoe body.

Thereafter, after cooling and demolding, a heel separately manufactured as one of the parts to be assembled is attached to the outer heel of the heat-gelated material 20 which is the outer layer, for example, by adhesion, and then the shoe body is covered with a shoe cloth. The slush molded shoe is the final product by assembling the back cloth sewn from the material and the parts such as the insole and the fastener by sewing and adhering, and painting.

(12) Foam slush molded shoe according to claim 12 Fig. 8 is an explanatory view schematically showing a method for manufacturing a foam slush molded shoe according to claim 12.

(First Step to Third Step (j)) The first step to the third step (j) are shown in FIG.
Since the first to third steps (j) of the foamed slush molded shoe according to the present invention described are exactly the same, the description thereof is omitted here.

(Third step (k) and third step (l))
As shown in FIGS. 8 (k) and 8 (l), the toe part 25 and the heel part 2 of the inner layer 21 obtained in the third step (j)
4 and the sole-requiring portion 17 such as the shoe sole 26 are heated for a short time below the foaming agent decomposition temperature or above the foaming agent decomposition temperature, and the other portion 18 of the inner layer 21 excluding the reinforcement-requiring portion 17 is decomposed by the foaming agent decomposition temperature. More preferably, it is heated for a short time. As the heating condition, the reinforcement required portion 17:17
0-180 ℃ x 2-3 minutes, other parts 18: 200
It can be exemplified by 210 ° C for 2 to 3 minutes.

The means for heating the heating condition of the reinforcement required portion 17 and the heating condition of the other portion 18 differently are not limited to specific means. For example, heating may be performed by appropriately adjusting the arrangement and temperature of the heating device on the furnace wall of the heating furnace that heats the slush-molding shoe mold 13 having the inner surface of which the gelled product is formed.

The reinforcement-needed portion 17 hardly foams because it is heated below the blowing agent decomposition temperature, while the other portion 18 thermally decomposes the foaming agent to generate gas and foam. In addition,
When the temperature of the reinforcement-requiring portion 17 reaches the foaming agent decomposition temperature, foaming starts, and when the temperature rises for a longer time, the expansion ratio increases, and eventually over-foaming results in collapse of the cells and rough skin, and the strength required for the inner layer. Since it may be difficult to maintain the above, it is desirable to adjust the heating time so that the expansion ratio of each part of the inner layer is 200% or less as in the foamed slush molded shoe according to the fifth aspect.

As described above, by heating the reinforcing required portion 17 and the other portion 18 at different heating temperatures,
As shown in FIG. 8 (l), the reinforcement-needed portion 17 is non-foamed (foaming ratio: 100%) or low foaming (foaming ratio: 10).
More than 0% and less than 200%) and other parts 18
Is a foaming ratio: the foaming ratio is 100% or more and 200% or less, and the foaming ratio of all or a part of the reinforcement-requiring portion 17 (for example, 120%) is that of the other portion 18 (for example, 18).
0%). Therefore, the reinforcement required portion 17
The strength of is further improved together with the large thickness.

In this way, a thin film gelled product 2 of plastisol 12 containing a polyvinyl chloride paste resin is formed.
0 and an inner layer made of a heat-gelled plastisol 16 containing a polyvinyl chloride paste resin and a foaming agent, and the inner layer has a foaming ratio of all or a part of the reinforcement required portion 17 The portion 18 is expanded so that the expansion ratio is smaller than that of the portion 18, and the wall thickness of the reinforcement required portion 17 is
And the outer layer is formed in a range that covers the reinforcement necessary portion 17 such as the toe portion 25, the heel portion 24, and the shoe sole portion 26 of the inner layer and the rear vertical wall surface 15a. The shoe body constituting the slush molded shoe according to item 7 is manufactured.

Thereafter, after cooling and demolding, a heel separately manufactured as one of the parts to be assembled is attached to the outer surface heel of the heat-gelated material 20 which is the outer layer, for example, by adhesion, and then the shoe body is covered with a shoe cloth. The slush molded shoe is the final product by assembling the back cloth sewn from the material and the parts such as the insole and the fastener by sewing and adhering, and painting.

(13) Method for manufacturing foam slush molded shoe according to claim 13 In the method for manufacturing foam slush molded shoe according to any one of claims 9 to 12, from the viewpoint of further promoting weight reduction, The plastisol forming the outer layer may contain a foaming agent.

The type of the foaming agent may be the same as that of the foaming agent contained in the plastisol constituting the above-mentioned inner layer, which is the heated gelled material 21, and the description thereof is omitted here. When the content of the foaming agent exceeds 0.3 parts by weight with respect to 100 parts by weight of the polyvinyl chloride paste resin, the heat-gelated product as the outer layer 2
Since the foaming on the surface of No. 0 becomes remarkable and the protective function of the heated gelled material 21 which is the inner layer is lowered, the content of the foaming agent is 0.1% with respect to 100 parts by weight of the polyvinyl chloride paste resin.
The amount is preferably 3 parts by weight or less, and more preferably 0.1 parts by weight or less from the same viewpoint.

(14) Manufacturing method of foam slush molded shoe according to claim 14 In any of the manufacturing method of foam slush molded shoe according to claims 9 to 13, the method is manufactured as an assembly part after slush molding of the shoe body. Although the heel is attached to the outer heel, it is injected as the paste for the heel in the slush molding process into the inner surface of the bottom of the semi-gelated shoe body that is layered on the inner wall of the slush molding shoe mold,
There is also a method of constructing a heel core by heating it to a gelling temperature or higher, and by doing so, it is possible to further improve the strength and hardness of the heel portion, which is the most required strength and hardness of a shoe. Hereinafter, this manufacturing method will be described.

FIGS. 9 and 10 are explanatory views schematically showing an example of a method for manufacturing the foam slush molding shoe according to claim 14, and FIG. 9 is a foam slush molding according to claim 9 shown in FIG. FIG. 10 shows the case where the heel paste is injected in the slush molding step of the shoe manufacturing method.
13. The case of injecting a heel paste in the slush molding step of the method for producing a foamed slush molded shoe according to claim 12.

According to the method for producing a foam slush molded shoe according to claim 14, as shown in FIG. 9 (i) or FIG. 10 (i), the method for producing a foam slush molded shoe according to claim 9 or 12 is used. In the third step, the semi-gelated product 15 formed as a layer on the inner wall surface of the slush molded shoe mold 13
Before heating to a temperature range not lower than the gelling temperature and lower than the foaming agent decomposition temperature, the heel paste 22 is injected into the inner heel of the semi-gelated material 15.

The heel paste 22 is exactly the same as the heel paste described in detail in the foam slush molded shoe according to claim 7 described in (7), and therefore the description thereof is omitted here.

The temperature of the heel paste 22 to be injected is
The injection is performed at room temperature or at a temperature lower than room temperature, preferably at 10 ° C. or lower.

After that, the gelation proceeds as shown in FIG. 9 (k) or FIG. 10 (k) by the heating gelation in the third step, and further, in the heating to the foaming agent decomposition temperature or higher in the third step. In addition, since it is injected in a large amount to fill all the heel portion 24 and has a large heat capacity, the amount of heat supplied to the bottom portion of the heel portion 24 that comes into contact with the heated gelation material of the shoe body is taken away, and this heel portion 24 Suppresses the temperature rise at the bottom. Therefore, the temperature of the bottom portion of the heel portion 24 is suppressed as compared with the toe portion 25 and the shoe sole portion 26, and the foaming ratio of the bottom portion of the heel portion 24 has the toe portion 25 and the sole portion of the reinforcement required portion 17. As compared with 26, the strength is further suppressed, and the strength of the bottom of the heel portion 24 is increased.

Thus, according to the method for manufacturing a foamed slush molded shoe of the fourteenth aspect, the heel core 23 made of the heat-gelated paste 22 for the heel injected in the slush molding step is provided on the inner surface heel part. With
The bottom of the heel portion 24 has a foaming ratio of toe portion 25 and the sole portion 2 of the shoe.
6. The heat-gelled material 21 which is an inner layer having a smaller expansion ratio than each of the six expansion ratios, that is, the inner layer of the foam slush molded shoe according to claim 7, can be produced.

Thereafter, after cooling and demolding, the shoe body composed of the heated gelled substance 21 which is the inner layer and the heated gelled substance 20 which is the outer layer is attached to the back cloth and the insole which are sewn from the shoe cloth material. The final product is a foam slush molded shoe that is assembled by assembling with fasteners and other parts by sewing, bonding, etc., and then painted.

Further, as in the method for manufacturing the foam slush molded shoe according to claim 15, in the method for manufacturing the foam slush molded shoe according to claim 14, when the heel paste 22 contains a hollow body having heat resistance, It is possible to reduce the weight of the heel core 23, which is a heated gelation product of the heel paste 22. It is possible to include a foaming agent in the heel paste 22 as a means for reducing the weight of the heel core 23, but the heel paste 22 injected into the inner bottom surface of the semi-gelated product during foaming by heating is convex. Inflates like a
It may not be possible to maintain the predetermined shape of the heel core 23 whose upper end surface is substantially linear. Further, as will be described later, when the foaming inhibitor is contained in the heel paste, there is a problem that even if the foaming agent is contained, the foaming inhibitor cannot foam. If it is a hollow body, such a problem does not occur.

When the above-mentioned heel paste 22 contains a foaming inhibitor, the foaming ratio of the bottom surface of the heel portion 24 of the heat-gelled material 21 with which the heel paste 22 comes into contact can be further suppressed, and the heel portion can be further suppressed. The strength of the bottom surface of 24 can be further improved.

Since the hollow body and the foam suppressor are exactly the same as those of the foam slush molding shoe according to claim 8 described above, the description thereof is omitted here.

As described above, according to the method for producing the foam slush molded shoe of the fifteenth aspect, as compared with the foam slush molded shoe produced by the method for producing the foam slush molded shoe of the fourteenth aspect, the heel is When the paste 22 for heat contains a hollow body having heat resistance, weight reduction of the heel core 23 is performed, and when the paste 22 for heel contains a foaming inhibitor, foaming of the bottom surface of the heel portion 24 with which the heel core 23 is in contact. Further reduction of the magnification can be achieved respectively.

[0136]

EXAMPLES Further, the foam slush molded shoe and the method for producing the same according to the present invention will be described in detail with reference to Examples, but this is an example of the present invention and the present invention is not limited thereto. .

Example 1 A foam slush molded shoe was manufactured by the method for manufacturing a foam slush molded shoe according to the present invention shown in FIG.

That is, as the first step, as shown in FIG. 9 (a), the plastisol 12 containing a polyvinyl chloride paste resin having the composition shown in Table 1 as a main component and containing no foaming agent was used.
Is poured into the slush-molded shoe mold 13 up to the upper end opening 14, and as shown in FIG.
By heating under a heating condition of 00 ° C. for 10 to 30 seconds, as shown in FIG. 9C, a thin film-like semi-gelated product 15 having a shoe body shape with a thickness of about 0.2 mm is slush-molded. A layer is formed on the inner wall surface of the mold 13 for molding, and as shown in FIG. 9D, the surplus ungelled plastisol 12 remaining on the inner surface of the semi-gelated product 15 is tilted in the slush molding shoe mold 13. And discharged from the upper end opening 14.

[0139]

[Table 1]

Next, as a second step, as shown in FIG. 9E, the plastisol 16 containing the polyvinyl chloride paste resin having the composition shown in Table 1 and the foaming agent was applied to the inner wall surface of the slush molded shoe mold 13. 9 (f) is injected into the inside of the semi-gelated material 15 formed as a layer on the upper end opening 14.
As shown in, the toe part, the heel part and the sole part need to be reinforced under the heating condition of 100 ° C x 4 minutes, and the other part of the shoe body except the part that needs the reinforcement (thighs, tubular parts, etc.) As shown in FIG. 9 (g), the thickness of the reinforcement required portion 17 is about 2.0 mm and the thickness of the other portion 18 is about 1 mm by heating 100 ° C. for 2 minutes. 0.0 mm
The semi-gelated product 19 in the shape of the shoe body is layered on the inner wall surface of the slush-molded shoe mold 13, and as shown in FIG. The plastisol 16 in the liquefied state was discharged from the upper end opening 14 while inclining the slush molding shoe mold 13.

Further, as a third step, as shown in FIG. 9 (i), the heel paste A having the composition shown in Table 2 is injected and filled into the recess forming the inner heel of the semi-gelated material 19, As shown in FIG. 9 (j), the above-mentioned reinforcement required portion 17
Was heated at 170 ° C. for 3 minutes and the other portion 18 was heated at 160 ° C. for 3 minutes, whereby gelation proceeded as shown in FIG. 9 (k).

[0142]

[Table 2]

Subsequently, in the third step, as shown in FIG. 9 (l), the inner layer 21 is heated under the heating condition of 200 ° C. × 2 minutes to obtain the heated gelled material 21 as shown in FIG. 9 (m). The heat-gelated product which becomes the shoe body of the slush-molded shoe according to claim 7, wherein the whole is completely gelled and foamed substantially uniformly, then cooled at room temperature for 6 minutes and then extracted from the slush-molded shoe mold 13. 20
And 21 were produced.

Heat-gelated product 2 thus produced
As can be seen from the foaming ratio of each part of the inner layer shown in Table 3, the shoe main body composed of 0 and 21 has the reinforcement required portion 17 and the other portion 18 foamed substantially uniformly, and the reinforcement required portion 17 has the other wall thickness. The thickness of the portion 18 is larger than that of the portion 18, and the outer surface of the inner layer is entirely covered with a thin film-shaped outer layer.

[0145]

[Table 3]

Therefore, the shoe main body is lightweight as a whole, and the strength of the reinforcement necessary portion 17 is maintained. Further, since each part of the heat-gelled material 21 which is the inner layer is foamed, the heat insulating property is excellent and the cushioning property (comfort) is also good. Further, leather foam-like crease-like small wrinkles are imparted to the surface of the heat-gelated material 21 by foaming, which can improve the sense of quality with respect to the conventional slush-molded shoes having a smooth surface, and the outer layer protects this surface. It was possible to improve the resistance to scratches and the like. Further, by injecting and heating the heel paste 22 before gelling which is a slush molding process, the heel core 23
Therefore, the foaming ratio of the bottom surface of the heel portion 24 of the heated gelled material 21 which is the inner layer in contact with the heel paste 22 can be suppressed to be smaller than that of the toe portion 25, the shoe sole portion 26, etc. It was possible to increase the strength of the bottom surface of the heel portion 24 of the gelled material 21, which is most required to have wear resistance.

In this example, azodicarbonamide (ADCA) was used as the foaming agent mixed in the plastisol 16.
And a composite additive of Zn and Ba was used as a stabilizer. The blowing agent decomposition temperature of the blowing agent azodicarbonamide is 195 ° C, but since Zn promotes foaming as described above, the blowing agent azodicarbonamide foams at about 180 ° C in plastisol.

Further, when heating the semi-gelled material 15 in the above-mentioned third step, a large amount of heat is required for the reinforcement-requiring portion 17 such as the toe portion, the heel portion and the shoe sole portion because the wall thickness is large. From the beginning, if you heat at high temperature for a long time,
An excessive amount of heat is received until sufficient gelation is obtained, resulting in excessive foaming or roughening of the surface of the heated gelled material 21 which is the inner layer.

Therefore, in this embodiment, since the other portion 18 (the mouth portion, the tubular portion, etc.) having a small wall thickness requires a small amount of heat for gelation, it is heated at a relatively low temperature of 160 ° C. for 3 minutes. On the other hand, since the reinforcement-required portion 17 having a large wall thickness requires a large amount of heat for gelation, it should be heated at a relatively high temperature of 170 ° C. × 3 minutes in the temperature range below the decomposition temperature of the foaming agent. Thus, after allowing gelation to proceed without foaming, heating at 200 ° C., which is higher than the decomposition temperature of the foaming agent, for a short time of 2 minutes prevented excessive foaming.

(Example 2) In the first step of Example 1, plastisol 12 was injected into the slush molded shoe mold 13 to a height including toes, heels, shoe soles, and other reinforcement-requiring parts. Slush molded shoe mold 1
7. Excessive plastisol is discharged by tilting 3 backward, and the blowing agent content of the plastisol constituting the inner layer is 0.5 parts by weight under exactly the same conditions as in Example 1; The foamed slush molded shoe described was produced.

The shoe body composed of the heat-gelled products 21 and 20 having a two-layer structure which forms the inner layer and the outer layer thus produced has a reinforcement-requiring portion 17 and a reinforcement-requiring portion 17 as shown in the expansion ratio of each portion of the inner layer shown in Table 4. The other portion 18 is foamed substantially uniformly, and the wall thickness of the reinforcement required portion 17 is configured to be larger than the wall thickness of the other portion 18, and the reinforcement required portion 17 and the rear vertical wall surface of the inner layer are It is completely covered with a thin film outer layer.

[0152]

[Table 4]

Therefore, the shoe main body is lightweight as a whole, and the strength of the reinforcement necessary portion 17 is maintained. Further, since each part of the heat-gelled material 21 which is the inner layer is foamed, the heat insulating property is excellent and the cushioning property (comfort) is also good. In addition, the heat-gelled material 21 has a small wrinkle like a leather pattern on the surface of the heat-gelated product 21 due to foaming, which can improve the sense of quality as compared with the conventional slush-molded shoes having a smooth surface, and the outer layer reinforces the inner layer. The surface of the necessary portion 17 could be protected and the resistance to scratches and the like could be improved. Further, since the heel core 23 is formed by injecting and heating the heel paste 22 before gelling which is the slush molding process, the heat-gelated product 2 which is the inner layer with which the heel paste 22 comes into contact.
The foaming ratio of the bottom surface of the heel portion 24 of 1 is the toe portion 25, the sole portion 2
It was possible to suppress it to be smaller than that of No. 6, etc., and it was possible to increase the strength of the heel portion 24 of the heated gelled material 21 which is the inner layer, where abrasion resistance is most required.

Example 3 A polyvinyl chloride paste resin and a foaming agent were added, and the content of the foaming agent azodicarbonamide (ADCA) in the plastisol constituting the inner layer was changed to 0.5 parts by weight, and the composition of Example 1 was changed. A foamed slush molded shoe was manufactured in exactly the same manner as.

As a result, the expansion ratio of the inner layer was 150%, and it was possible to obtain a foamed slush molded shoe in a favorable foamed state which was lightweight and maintained the required strength.

(Example 4) The third example of Example 1 shown in FIG. 9 was used, in which the content of the blowing agent azodicarbonamide (ADCA) in the plastisol constituting the inner layer was 0.5 parts by weight.
In the step, the heel paste B having a composition containing a heat-resistant hollow body shown in Table 2 is injected and filled, and in the same third step, the reinforcement necessary portion 17 of the heat gelation product 21 which is the inner layer is heated at 180 ° C. The slush molding shoe mold is heated under heating conditions of 2 minutes and the other part 18 of the gelled material 21 is heated under heating conditions of 200 ° C. for 2 minutes, and then cooled at room temperature for 6 minutes. The shoe body of the slush molded shoe according to claim 7 was manufactured by extracting the shoe body from No. 13.

[0157] A shoe body having a heated gelation product 21 of plastisol containing a polyvinyl chloride paste resin and a foaming agent as an inner layer and a heating gelation product 20 of plastisol containing a polyvinyl chloride paste resin as an outer layer has inner layers shown in Table 5 below. Reinforcement required part 17 as can be seen from the expansion ratio of each part
Is low and the other portion 18 is foamed with a high expansion ratio, and the wall thickness of the reinforcement-needed portion 17 is larger than the wall thickness of the other portion 18.

[0158]

[Table 5]

Therefore, the shoe main body is lightweight as a whole, and the strength of the reinforcement-requiring portion 17 is kept extremely sufficient. In addition, since each part of the inner layer was foamed at the expansion ratio shown in Table 5, the heat insulating property was excellent and the cushioning property (wearing comfort) was also good. In addition, the foaming imparts a leather pattern-like kerf-like small wrinkle on the surface, and the slush-molded shoes can be improved in a high-class feeling on the conventional smooth surface. In addition, since the heel core 23 is formed by injecting and heating the heel paste 22 before heating and gelling in the slush molding process, the heel paste 22 is formed.
The foaming ratio of the bottom surface of the heel portion 24 of the shoe body that is in contact with the shoe body can be suppressed to be smaller than that of the toe portion 25, the shoe sole portion 26, etc., and the strength of the bottom surface of the heel portion 24 of the shoe body where the wear resistance is most required. Could be increased. Further, since the heel core 23, which is a heat-gelated product of the heel paste 22, includes a hollow body and is lightweight, the weight of the shoe body can be further promoted.

Example 5 In the first step of Example 4, as shown in FIG. 9A, a plastisol 12 containing a polyvinyl chloride paste resin having a composition shown in Table 1 and containing no blowing agent was used. After pouring into the slush molded shoe mold 13 up to the upper end opening 14, as shown in FIG. 9 (b), the parts to be reinforced such as the toe part, the heel part and the sole part are 100 ° C. × 30. ~ 40 seconds, 100 ° C × 20 ~ the other parts such as the mouth and tube
By heating for 30 seconds, as shown in FIG. 9 (c), a thin film having a thickness of 0.4 mm in the portion to be reinforced and a thickness of 0.3 mm in the other portion is formed. The semi-gelated product 15 is layered, and the surplus ungelled plastisol 12 remaining on the inner surface of the semi-gelated product 15 is tilted backward to the slush molding shoe mold 13, as shown in FIG. 9D. And discharged from the upper opening 14.

Except for this, the foamed slush molded shoe of claim 7 was manufactured in exactly the same manner as in the second and third steps of Example 4.

For the foamed slush molded shoe according to the present invention obtained in Example 4, the heated gelled product 20 which is the outer layer covering the reinforcement necessary portion 17 of the heated gelled product 21 which is the inner layer obtained in this Example. And the thickness of the heat-gelled substance 21 which is the outer layer covering the other portion 18 of the heat-gelled substance 21 which is the inner layer becomes smaller,
By changing the thickness of the outer layer for each part, it was possible to improve the strength of the reinforcement-requiring part 17 and reduce the weight of the other part 18.

(Example 6) In the first step of Example 4, plastisol 12 containing a polyvinyl chloride paste resin having the composition shown in Table 1 and containing no foaming agent was placed inside a slush molded shoe mold 13. By pouring to the upper end opening 14 and heating the whole under heating conditions of 100 ° C. for 10 to 30 seconds, a thin gel semi-gelated material 15 in the form of a shoe body having a thickness of about 0.2 mm is slush-molded. A layer was formed on the inner wall surface of the mold 13 for use, and the surplus ungelled plastisol 12 remaining on the inner surface of the semi-gelated product 15 was discharged from the upper end opening 14 while inclining the slush molding shoe mold 13.

Further, in the third step of Example 4, the heel paste B having the composition containing the heat-resistant hollow body shown in Table 2 was injected, and the liquid temperature thereof was suppressed to 5 ° C. or lower than room temperature.

A foam slush molded shoe was manufactured in the same manner as in Example 4 except for the above conditions. Table 6 shows the expansion ratio of each part of the shoe body.

[0166]

[Table 6]

When the semi-gelled product 15 layered on the inner wall surface of the slush molding shoe mold 13 is poured into the concave part of the inner surface of the heel paste 22 with the liquid temperature of the heel paste 22 suppressed in this way, the heel part 24 In addition to the decrease in the temperature of the heel, the heel paste 22 absorbs the amount of heat supplied to the heel portion 24 by heating during the subsequent heat gelation, and the heel paste 22 increases the temperature of the heel portion 24 in the inner layer. Suppress.

Therefore, the toe portion 25 and the shoe sole portion 26 of the reinforcement-requiring portion 17 have a low foaming ratio, and the other portions 18 such as the crotch portion and the tubular portion are in a good foaming state, and the reinforcement-requiring portion 17 is required. The bottom surface of the heel portion 24 could be made to have an extremely low expansion ratio.

Therefore, it is possible to manufacture a foam slush molded shoe in which the strength of the bottom surface of the heel portion 24, which requires the most abrasion resistance among the inner layers, is increased. Further, since the heel paste 22 contains a hollow body, it is possible to reduce the weight of the heel core 23.

Example 7 A foam slush molded shoe was manufactured by partially modifying the third step of the method for manufacturing a foam slush molded shoe according to the present invention shown in FIG.

That is, as the first step, as shown in FIG. 9A, the plastisol 12 containing a polyvinyl chloride paste resin having the composition shown in Table 1 as a main component and containing no foaming agent.
Is poured into the slush-molded shoe mold 13 up to the upper end opening 14, and as shown in FIG.
By heating under a heating condition of 00 ° C. for 10 to 30 seconds, as shown in FIG. 9C, a thin film-like semi-gelated product 15 having a shoe body shape with a thickness of about 0.2 mm is slush-molded. A layer is formed on the inner wall surface of the molding mold 13, and the surplus ungelled plastisol 12 remaining on the inner surface of the semi-gelated product 15 is inclined by slash molding shoe mold 13 as shown in FIG. 9 (d). And discharged from the upper opening 14.

Next, as a second step, as shown in FIG. 9 (e), the plastisol 16 containing the polyvinyl chloride paste resin having the composition shown in Table 1 and the foaming agent was placed inside the slush molded shoe mold 13. 9F is injected into the upper end opening portion, and as shown in FIG. 9F, the reinforcement required portion 17 such as the toe portion, the heel portion, and the shoe sole portion is heated at 100 ° C. for 6 minutes, and the reinforcement required portion of the shoe body. By heating the other parts 18 (cuffs, cylinders, etc.) except 17 under the heating condition of 100 ° C. × 2 minutes, as shown in FIG. 9 (g), the thickness of the reinforcement required part 17 is about 3 mm. There are other parts 18
Is formed on the inner wall surface of the slush molding shoe mold 13 and has a thickness of about 1 mm and is left on the inner surface of the semi-gelated product 19 as shown in FIG. 9 (h). The surplus ungelled plastisol 16 was discharged from the upper end opening 14 while inclining the slush molding shoe mold 13.

Next, in the third step, as shown in FIG. 9 (i), the hollow body having heat resistance shown in Table 2 and the foaming inhibitor shown in Table 2 are placed in the recesses forming the inner heel of the semi-gelated product 19. A heel paste C having a composition containing is injected and filled, and FIG.
As shown in Fig. 9, by heating the above-mentioned reinforcement required portion 17 under heating conditions of 170 ° C x 3 minutes and the other portions 18 under heating conditions of 160 ° C x 3 minutes, as shown in Fig. 9 (k), The gelled product 19 was used as the heated gelled product 21.

Further, as the third step, in place of the third step shown in FIG. 9 (l) and FIG. 9 (m), the reinforcement necessary portion 17 of the heated gelated material 21 is heated at 170 ° C. for 4 minutes. The heating is performed under the conditions, and the other portion 18 of the heated gelated material 21 is heated under the heating conditions of 200 ° C. × 2 minutes, and then cooled at room temperature for 6 minutes, and then extracted from the slush molding shoe mold 13. A shoe body of the described slush molded shoe was produced. Table 7 shows the foaming ratio of each part of the inner layer constituting the shoe body.

[0175]

[Table 7]

As can be seen from the foaming ratio of each part of the inner layer shown in Table 7, the inner layer formed of the heat-gelled substance 21 of the plastisol 16 containing the polyvinyl chloride paste resin and the foaming agent has a low reinforcement required portion 17 and other portions 18 It is foamed with a high expansion ratio, and the wall thickness of the reinforcement required portion 17 is configured to be larger than the wall thickness of the other portion 18.

Therefore, the shoe main body is lightweight as a whole, and the strength of the reinforcement required portion 17 is maintained. Further, since each part of the inner layer was foamed at the expansion ratio shown in Table 7, the heat insulating property was excellent and the cushioning property (comfort) was also good. In addition, when it is bent by foaming, small wrinkles in the shape of a leather pattern are added to the surface, which makes it possible to improve the quality of the slush-molded shoes with the conventional smooth surface. Further, since the heel core 23 is formed by injecting and heating the heel paste 22 before gelling, which is the slush molding process, the foaming ratio of the bottom surface of the heel portion 24 of the inner layer with which the heel paste 22 comes into contact is set. Toe portion 25,
It can be suppressed to be smaller than that of the shoe sole portion 26 and the like, and the strength of the bottom surface of the heel portion of the inner layer where abrasion resistance is most required can be increased. Further, since the heel core 23, which is a heat-gelated product of the paste 22 for heel, includes a hollow body, it is lightweight, and the weight of the shoe body can be further promoted.

Further, since the heel paste 22 contains a foaming inhibitor, the inner surface heel portion of the inner layer which is in contact with the heel paste 22 is deprived of the heat amount by the heel paste 22 to cause another temperature rise. The foaming ratio is extremely suppressed by the synergistic effect of being suppressed more than the site and the foaming inhibitor suppressing foaming. Therefore, the strength of the bottom surface of the heel portion 24 of the inner layer can be sufficiently secured to be substantially equal to that of non-foaming.

[0179]

According to the first aspect of the present invention, there is provided a foam slush molded shoe having an outer layer formed by a thin gelled gelled product of plastisol containing a polyvinyl chloride paste resin, the polyvinyl chloride paste resin and a foaming agent. The shoe body is composed of an inner layer composed of a heated gelation product of plastisol containing, and the inner layer is foamed, and the wall thickness of the toe part, the heel part, the shoe sole part, etc., of the inner layer, which is necessary for reinforcement, is Since it is thicker than the wall thickness of the other portions excluding the reinforcement-required portion, it is lightweight as a whole and the reinforcement-required portion is kept by the thickness. Also,
Since each part of the inner layer is foamed, it has excellent heat insulation and cushioning properties (comfort). Further, the foaming imparts a leather pattern-like small wrinkle in a kerf tone to the surface to improve the high-class feeling. Furthermore, since the outer layer protects the inner layer, the resistance of the inner layer to scratches and the like is improved.

In the foamed slush molded shoe according to the second aspect of the present invention, the outer layer is formed in a range that covers the reinforcement required part such as the toe part, the heel part and the shoe sole part of the inner layer and the rear vertical wall surface. With the foamed slush molded shoe according to the first aspect, it is possible to promote the weight reduction and maintain the resistance to scratches and the like of the reinforcement required portion.

The foamed slush molded shoe according to the present invention of claim 3 is the foamed slush molded shoe of claim 1 or claim 2, wherein the outer layer has a wall thickness of 0.5 mm or less, and therefore the weight saving effect is maintained. It is possible to clearly express the leather pattern design and the small wrinkles in the leather calf that are formed on the surface.

The foamed slush molded shoe according to the present invention of claim 4 is the foamed slush molded shoe according to any one of claims 1 to 3, wherein the plastisol constituting the outer layer contains a foaming agent, so that the weight can be further reduced. Can be promoted.

A slush molded shoe according to a fifth aspect of the present invention is the foamed slush molded shoe according to any one of the first to fourth aspects, in which the foaming ratio of the inner layer is 200% or less, so that the shoe is lightweight as a whole. The strength of the part requiring reinforcement is maintained.

A foam slush molded shoe according to a sixth aspect of the present invention is the foam slush molded shoe according to any one of the first to fifth aspects, in which all or part of the reinforcement-needed portion has a foaming ratio of other portion. Since it is smaller than the magnification, it is lightweight as a whole and the strength of the portion requiring reinforcement is sufficiently maintained.

A foam slush molded shoe according to a seventh aspect of the present invention is the foam slush molded shoe according to any one of the first to sixth aspects, wherein the shoe body has a heel gel heated gel on the inner heel portion. 7. A heel core made of a compound is provided, and since the foaming ratio of the bottom surface of the heel part of the reinforcement-requiring part is smaller than the foaming ratio of the toe part and the shoe sole part, respectively. In addition to the effect of the foamed slush molded shoe, it is possible to maximize the strength of the bottom surface of the heel portion that requires the most abrasion resistance among the reinforcement-required portions.

The foamed slush molded shoe according to claim 8 of the present invention is the foamed slush molded shoe according to claim 7, wherein when the heel paste contains a hollow body having heat resistance, In addition to the effect of slush molded shoes, it is possible to reduce the weight of the heel core,
When the heel paste contains a foam suppressor, in addition to the effect of the foamed slush molded shoe according to the fourth aspect, the strength of the bottom surface of the heel part can be further improved.

According to a ninth aspect of the present invention, there is provided a method for producing a foamed slush molded shoe, wherein a semi-gelled product in the form of a thin film is laminated as an outer layer on the inner surface of the slush molded shoe mold, and then the inner surface of the semi-gelated product is formed. A semi-gelled product containing a foaming agent is layered on the two-layer structure, and the shoe body is foamed after heating the gelled product of the two-layer structure above the heating gelling temperature to below the foaming agent decomposition temperature to promote gelation. Therefore, the inner layer is protected by the outer layer, and the reinforcing portion of the inner layer is thicker than the other portions and is in a uniform low foaming state. That is,
Using a plastisol containing a polyvinyl chloride paste resin and a foaming agent, the inner layer is reinforced substantially uniformly so that the wall thickness of the inner layer needs to be increased more than that of the other part. It is possible to reduce the weight while ensuring the strength.

According to a tenth aspect of the present invention, there is provided a method for manufacturing a foamed slush molded shoe, wherein a thin film semi-gelled material is formed as an outer layer on the lower portion of the inner surface of the slush molded shoe mold, and then the semi-gelated material is formed. A semi-gelled product containing a foaming agent is layered on the inner surface, and the shoe body is foamed after heating the gelling material of these two-layered structures above the heating gelling temperature to below the foaming agent decomposition temperature to promote gelation. Therefore, the inner layer is protected by the outer layer, and the portion of the inner layer where reinforcement is required is thicker than the other portions and is in a uniform low foaming state. That is, by using a plastisol containing a polyvinyl chloride paste resin and a foaming agent, the inner layer is foamed substantially uniformly so that the wall thickness of the portion requiring reinforcement of the inner layer is larger than that of other portions, and thus the reinforcement of the obtained inner layer is performed. It is possible to reduce the weight while ensuring the strength of the necessary parts.

In the method for producing a foamed slush molded shoe according to the present invention as defined in claim 11, a thin gel semi-gelled product is formed as an outer layer on the inner surface of the slush molded shoe mold, and then the inner surface of the semi-gelated product is formed. A layer of semi-gelled material containing a foaming agent is formed on the inner layer, and the gelling is promoted by heating the half-gelated material of these two-layered structures to a temperature above the heating gelling temperature and below the decomposition temperature of the blowing agent, and then reinforcing the inner layer. Since the foaming ratio of the necessary portion is suppressed and foaming is performed, the reinforcing required portion is thicker than the other portions and has low foaming. That is, the inner layer is protected by the outer layer, and the thickness of the reinforcement-requiring portion of the inner layer is increased by using plastisol containing the polyvinyl chloride paste resin and the foaming agent, and the entire portion of the reinforcement-requiring portion is increased. Alternatively, since the inner layer is foamed such that the foaming ratio of one part is smaller than the foaming ratio of the other part, it is possible to reduce the weight while sufficiently securing the strength of the obtained shoe body where reinforcement is required.

In the method for producing a foamed slush molded shoe according to the twelfth aspect of the present invention, a thin film semi-gelled product is formed as an outer layer on the lower portion of the inner surface of the slush molded shoe mold, and then the semi-gelated product is formed. A semi-gelled product containing a foaming agent is layered on the inner surface, and the gelling proceeds by heating above the heating gelling temperature of the two-layered semi-gelated product to below the foaming agent decomposition temperature. Since the foaming ratio of the reinforcement-requiring portion is suppressed to cause the foaming, the reinforcement-requiring portion has a larger wall thickness than the other portions and has a low foaming ratio. That is, the inner layer is protected by the outer layer, and the thickness of the reinforcement-requiring portion of the inner layer is increased by using plastisol containing the polyvinyl chloride paste resin and the foaming agent, and the entire portion of the reinforcement-requiring portion is increased. Alternatively, since the inner layer is foamed such that the foaming ratio of one part is smaller than the foaming ratio of the other part, it is possible to reduce the weight while sufficiently securing the strength of the obtained shoe body where reinforcement is required.

In the method for producing a foamed slush molded shoe according to the twelfth aspect of the present invention, a thin gel semi-gelled product is formed as an outer layer on the lower portion of the inner surface of the slush molded shoe mold, and then the semi-gelated product is formed. A semi-gelled product containing a foaming agent is layered on the inner surface, and the gelling proceeds by heating above the heating gelling temperature of the two-layered semi-gelated product to below the foaming agent decomposition temperature. Since the foaming ratio of the reinforcement-requiring portion is suppressed to cause the foaming, the reinforcement-requiring portion has a larger wall thickness than the other portions and has a low foaming ratio. That is, the inner layer is protected by the outer layer, and the thickness of the reinforcement-requiring portion of the inner layer is increased by using plastisol containing the polyvinyl chloride paste resin and the foaming agent, and the entire portion of the reinforcement-requiring portion is increased. Alternatively, since the inner layer is foamed such that the foaming ratio of one part is smaller than the foaming ratio of the other part, it is possible to reduce the weight while sufficiently securing the strength of the obtained shoe body where reinforcement is required.

In the method for producing a foamed slush molded shoe according to the thirteenth aspect of the present invention, since the plastisol constituting the outer layer contains the foaming agent, the obtained foamed slush molded shoe can be made further lightweight. it can.

In the method for producing a foam slush molded shoe according to claim 14, in the third step of the method for producing a foam slush molded shoe according to any one of claims 8 to 12, the inner surface heel part of the semi-gelated product is used. 13. The heel paste is injected into, and heated to a temperature above the gelation temperature and below the decomposition temperature of the foaming agent to progress gelation, and then heated above the decomposition temperature of the foaming agent for foaming. In addition to the effect of the method for producing a foamed slush molded shoe according to any one of items 1, the foaming ratio of the heel part of the inner layer can be made smaller than the foaming ratio of each of the toe part and the sole part, and the strength of the heel part is extremely improved. It becomes possible to manufacture foam slush molded shoes.

In the method for manufacturing a foam slush molded shoe according to claim 15, in the method for manufacturing a foam slush molded shoe according to claim 14, the heel paste contains a hollow body having heat resistance and / or a foaming inhibitor. Therefore, it is possible to reduce the weight of the shoe main body and / or increase the strength of the heel portion.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the structure of an embodiment of a foam slush molded shoe according to the present invention as set forth in claim 1.

FIG. 2 is a longitudinal sectional view showing the structure of an embodiment of a foam slush molded shoe according to the present invention as defined in claim 2;

FIG. 3 is a vertical cross-sectional view showing the structure of an embodiment of a foam slush molded shoe according to the present invention of claim 7.

FIG. 4 is a vertical cross-sectional view showing the structure of an embodiment of a foam slush molded shoe according to the present invention according to claim 7;

FIG. 5 is an explanatory view schematically showing a method of manufacturing a foam slush molded shoe according to the present invention of claim 9.

FIG. 6 is an explanatory view schematically showing a method of manufacturing a foam slush molded shoe according to the present invention of claim 10.

FIG. 7 is an explanatory view schematically showing a method for manufacturing a foamed slush molded shoe according to the present invention of claim 11.

FIG. 8 is an explanatory view schematically showing a method for manufacturing a foam slush molded shoe according to the present invention of claim 12.

FIG. 9 is an explanatory view schematically showing a method for manufacturing a foam slush molded shoe according to the present invention of claim 14.

FIG. 10 is an explanatory view schematically showing a method of manufacturing a foam slush molded shoe according to the present invention of claim 14.

FIG. 11 is an explanatory diagram showing a method of manufacturing a slush molded shoe.

FIG. 12 is an explanatory diagram showing a method of manufacturing a slush molded shoe.

FIG. 13 is an explanatory diagram showing a method of manufacturing a slush molded shoe.

[Explanation of symbols]

 1 Foamed Slush Molded Shoes 2 Inner Layer 3 Sole Bottom 4 Wearing Portion 5 Toe Part 6 Heel Part 7 Reinforcement Required Part 8 Other Part 9 Heel Core 10 Outer Layer 11 Rear Vertical Wall 12 Plastisol 13 Mold for Slash Molding Shoe 14 Top Opening 15 Thin-film semi-gelated product 16 Plastisol 17 Reinforcement required part 18 Other parts 19 Semi-gelled product 20 Heated gelled product (outer layer) 21 Heated gelled product (inner layer) 22 Heel paste 23 Heel core 24 Heel part 25 Toe part 26 Shoe bottom part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B29L 31:50

Claims (15)

[Claims] 1. A shoe comprising an outer layer made of a heat-gelled product of plastisol containing a polyvinyl chloride paste resin in a thin film form and an inner layer made of a heat-gelled product of plastisol containing a polyvinyl chloride paste resin and a foaming agent. A foamed slush molded shoe having a main body, wherein the inner layer is foamed, and the wall thickness of a portion of the inner layer that needs to be reinforced, such as a toe portion, a heel portion, and a shoe sole, is the thickness of the inner layer that is reinforced. A foamed slush molded shoe characterized by being made thicker than the wall thickness of other parts except the part. 2. The outer layer is a toe portion of the inner layer,
2. The foamed slush molded shoe according to claim 1, wherein the foamed slush molded shoe is formed in a range that covers reinforcement-required portions such as a heel portion and a shoe sole and a rear vertical wall surface. 3. The foam slush molded shoe according to claim 1, wherein the thickness of the outer layer is 0.5 mm or less. 4. The foamed slush molded shoe according to claim 1, wherein the plastisol constituting the outer layer contains a foaming agent. 5. The foam slush molded shoe according to claim 1, wherein the expansion ratio of the inner layer is 200% or less. 6. The foam slush molded shoe according to claim 1, wherein a foaming ratio of all or a part of the reinforcement required part is smaller than a foaming ratio of the other part. 7. The inner layer is provided with a heel core made of a heat-gelled product of a heel paste injected in a slush molding process on the inner heel portion, and the expansion ratio of the bottom surface of the heel portion of the reinforcement-requiring portion is the same. The foamed slush molded shoe according to any one of claims 1 to 6, which has a smaller expansion ratio than that of each of the toe part and the sole part. 8. The foamed slush molded shoe according to claim 7, wherein the heel paste contains a hollow body having heat resistance and / or a foaming inhibitor. 9. A semi-gelled product in the form of a thin film, which is an outer layer, by injecting a plastisol containing a polyvinyl chloride paste resin into a mold for slush molding shoes to a height required as a shoe body of the slush molding shoes and heating the plastisol. A first step of forming a layer on the inner wall surface of the slush molded shoe mold and discharging the ungelled plastisol remaining on the inner surface of the semi-gelated product; and a plastisol containing a polyvinyl chloride paste resin and a foaming agent. Is injected into the inside of the semi-gelated material to a height required for the shoe body of the slush-molded shoe, and the heating conditions of the portion that is the reinforcement required portion and the portion that is the other portion other than the reinforcement required portion are different. By heating, the outer layer of the semi-gelled product in the form of a shoe body, in which the thickness of the reinforcement-required portion is larger than the thickness of the other portions, A second step of forming a layer as an inner layer on the inner wall surface of the semi-gelated product, and discharging the ungelled plastisol remaining on the inner surface of the semi-gelated product as the inner layer; and the semi-gelated product as the inner layer. The semi-gelled product, which is the outer layer, is heated to a temperature range not lower than the gelling temperature and lower than the foaming agent decomposition temperature to promote gelation, and then heated to a temperature not lower than the foaming agent decomposition temperature for foaming to give polyvinyl chloride. An outer layer composed of a thin gelled plastisol containing a paste resin and an inner layer composed of a plastisol heated gelled product containing a polyvinyl chloride paste resin and a foaming agent, the inner layer being foamed. And a third step of forming a shoe main body in which the wall thickness of the reinforcement-required portion is made larger than the wall thickness of the other portion. Production method of shoe molding shoes. 10. A plastisol containing a polyvinyl chloride paste resin is injected into a mold for slush molding shoes to a height including a necessary reinforcement portion such as a toe portion, a heel portion and a shoe sole of a shoe body of the slush molding shoe. By heating to form a thin film-like semi-gelated product as an outer layer on the lower part of the inner wall surface of the slush-molded shoe mold, and by tilting the slush-molded shoe mold backward, The first step of discharging the ungelled plastisol remaining on the inner surface, and the plastisol containing the polyvinyl chloride paste resin and the foaming agent is injected into the inside of the semi-gelled material to a height required for the shoe body of the slush molded shoe. , Heating the part to be the reinforcement required part and the part other than the reinforcement required part with different heating conditions. By doing so, a shoe-gel-like semi-gelated material in which the thickness of the reinforcing required portion is larger than the thickness of the other portion is formed as an inner layer on the inner wall surface of the outer half-gelated material, and the inner layer is formed. Second discharging the ungelled plastisol remaining on the inner surface of the semi-gelated product
Step, heating the semi-gelled product which is the inner layer and the semi-gelated product which is the outer layer, to a temperature range not lower than the gelling temperature and lower than the foaming agent decomposition temperature to progress gelation and then to the foaming agent decomposition temperature or higher. An outer layer composed of a plastisol thin-film heat-gelled product containing polyvinyl chloride paste resin by heating and foaming, and an inner layer composed of a plastisol heat-gelled product containing polyvinyl chloride paste resin and a foaming agent. And the inner layer is foamed, the thickness of the reinforcement-requiring portion is greater than the thickness of the other portion, and the outer layer is a toe portion, a heel portion and a portion of the inner layer. Manufacture of a foam slush molded shoe, comprising a third step of forming a shoe main body formed in a range covering a reinforcement required part such as a shoe sole and a rear vertical wall surface. . 11. A thin gel semi-gelated product which is an outer layer by injecting plastisol containing a polyvinyl chloride paste resin into a mold for slush molding shoes to a height required for a shoe body of the slush molding shoes and heating the plastisol. To form a layer on the inner wall surface of the slush molded shoe mold,
The first step of discharging the ungelled plastisol remaining on the inner surface of the semi-gelated product, and the plastisol containing the polyvinyl chloride paste resin and the foaming agent are required inside the semi-gelated product as the shoe body of the slush molded shoe. To a certain height, and by heating under different heating conditions for the portion that becomes the reinforcement-needed portion and the portion that becomes the other portion excluding the reinforcement-needed portion, the wall thickness of the reinforcement-needed portion becomes A semi-gelated product in the form of a shoe body having a thickness larger than the thickness of the part is formed as an inner layer on the inner wall surface of the semi-gelated product which is the outer layer, and the ungelled state which remains on the inner surface of the semi-gelated product which is the inner layer Second to discharge plastisol
Step, heating the semi-gelated product that is the inner layer and the semi-gelated product that is the outer layer to a temperature range not lower than the gelling temperature and lower than the decomposition temperature of the foaming agent to promote gelation, and then to reinforce the necessary reinforcement portion. By heating for a short period of time below the blowing agent decomposition temperature or above the blowing agent decomposition temperature and by heating the other portion above the above foaming agent decomposition temperature, a thin gelled gelled product of plastisol containing polyvinyl chloride paste resin is obtained. The outer layer is composed of an inner layer composed of a heat gelation product of plastisol containing a polyvinyl chloride paste resin and a foaming agent, wherein the inner layer has a foaming ratio higher than that of the other parts. The shoe body is formed by foaming so that the thickness of the necessary reinforcement portion is made larger than that of the other portions. Preparation of foamed slush molding shoe, characterized in that it comprises a third step that. 12. A plastisol containing a polyvinyl chloride paste resin is injected into a mold for slush molded shoes to a height including a portion of the shoe body of the slush molded shoes, such as a toe portion, a heel portion, and a shoe sole portion, which requires reinforcement. By heating to form a thin film-like semi-gelated product as an outer layer on the lower part of the inner wall surface of the slush-molded shoe mold, and by tilting the slush-molded shoe mold backward, The first step of discharging the ungelled plastisol remaining on the inner surface, and the plastisol containing the polyvinyl chloride paste resin and the foaming agent is injected into the inside of the semi-gelled material to a height required for the shoe body of the slush molded shoe. , Heating the part to be the reinforcement required part and the part other than the reinforcement required part with different heating conditions. By doing so, a shoe-gel-like semi-gelated material in which the thickness of the reinforcing required portion is larger than the thickness of the other portion is formed as an inner layer on the inner wall surface of the outer half-gelated material, and the inner layer is formed. Second discharging the ungelled plastisol remaining on the inner surface of the semi-gelated product
Step, heating the semi-gelated product that is the inner layer and the semi-gelated product that is the outer layer to a temperature range not lower than the gelling temperature and lower than the decomposition temperature of the foaming agent to promote gelation, and then to reinforce the necessary reinforcement portion. By heating for a short period of time below the blowing agent decomposition temperature or above the blowing agent decomposition temperature and by heating the other portion above the above foaming agent decomposition temperature, a thin gelled gelled product of plastisol containing polyvinyl chloride paste resin is obtained. The outer layer is composed of an inner layer composed of a heat gelation product of plastisol containing a polyvinyl chloride paste resin and a foaming agent, wherein the inner layer has a foaming ratio higher than that of the other parts. The thickness of the reinforcement-requiring portion is made larger than that of the other portion, and A foam slush comprising a third step of forming a shoe main body formed in a range covering a portion requiring reinforcement such as a toe portion, a heel portion and a shoe sole portion of the inner layer and a rear vertical wall surface. Molded shoe manufacturing method. 13. The method for producing a foamed slush molded shoe according to claim 9, wherein the plastisol constituting the outer layer contains a foaming agent. 14. The heel paste is injected into the inner heel of the semi-gelated product before heating the semi-gelated product, which is the inner layer, in the third step to a temperature range not lower than the gelling temperature but lower than the decomposition temperature of the foaming agent. 14. The foaming ratio of the heel portion of the shoe main body formed in the third step is made smaller than the foaming ratios of the toe portion and the sole portion of the shoe body, respectively. A method for producing a foam slush molded shoe according to claim 1. 15. The heel paste contains a hollow body having heat resistance and / or a foaming inhibitor.
4. The method for producing a foam slush molded shoe according to 4.