JP2008110176A - Shoe making method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shoe making method capable of integrally making a shoe having a strong shoe sole structure with ease. <P>SOLUTION: The method includes: a step of preparing a semimanufactured shoe sole having a volume 12 to 45% larger than a manufactured shoe sole through foaming, an upper, and a die having a last and a cavity is formed around the shoe die; a step of charging the upper and the semimanufactured shoe sole into the cavity of the die by placing the semimanufactured shoe sole on a surface combined with the shoe sole of the upper after covering the last with the upper; a step of softening the semimanufactured shoe sole so as to integrally bond with the upper according to the shape of the cavity by raising the temperature of the die at 110°C-150°C; and a step of cooling the die and contracting the semimanufactured shoe sole so as to be the volume of the manufactured shoe sole. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shoe manufacturing method, and more particularly to a shoe manufacturing method having a foamed sole.

  Patent Document 1 discloses an apparatus for integrally molding an outsole, an insole, and a welt on an upper. According to this apparatus, the thermoplastic material is injected into the cavity of the first mold, the welt molding cavity, and the insole molding cavity to form the outsole and the insole, and on the shoe mold that supports the upper. Also, a welt can be formed.

However, it is necessary to carry out foam molding of a thermoplastic material at a high temperature and high pressure by steam. In the shoe manufacturing method and apparatus by injection molding as described above, a resin is injected into the cavity, and the outsole and insole In order to obtain the expected shrinkage of the thermoplastic material, it is necessary to perform precise control while paying close attention to the steam exhaust system, molding pressure, and molding temperature. Also, problems such as lack of molding material and protrusion are likely to occur. In addition, it is an effective solution to use a large amount of molding material in order to prevent a shortage of molding material, but the waste of material becomes a conspicuous defect.
U.S. Pat. No. 4,960,374

  In view of the above, an object of the present invention is to provide a shoe manufacturing method capable of integrally manufacturing a shoe having a strong sole structure without controlling the molding pressure and molding temperature accurately.

  In order to achieve the above object, the present invention provides a semi-finished shoe sole that is foamed and has a volume 12% to 45% larger than the product shoe sole, an upper, a shoe mold, and a cavity around the shoe mold. A step of preparing a formed mold; and covering the upper with the shoe mold, and then placing the semi-finished shoe sole on one surface coupled to the shoe sole of the upper, thereby the upper and the semi-finished product. The step of inserting the shoe sole into the cavity of the mold, and the mold is heated to 110 ° C. to 150 ° C. to soften the semi-finished shoe sole, and to match the shape of the cavity, the upper And a step of causing the mold to cool again and shrinking the semi-finished shoe sole to the volume of the product shoe sole.

In the shoe manufacturing method, in the step of heating the mold, the shoe mold coated on the upper applies a pressure of 15 to 75 kg / cm ² to the semi-finished shoe sole, and the upper and the half It is preferable to firmly bond the product shoe sole.

  In the above shoe manufacturing method, it is preferable that a fence is formed extending upward on a surface of the semi-finished shoe sole that is bonded to the upper edge.

  In the shoe manufacturing method, the shoe mold is preferably heated and cooled together with the mold.

  In the said shoe manufacturing method, it is preferable to heat the said semi-finished shoe sole to 50 degreeC-120 degreeC before inserting in the said cavity.

  The shoe manufacturing method preferably includes a step of inserting an outsole into the mold cavity so as to sandwich the semi-finished shoe sole from both sides of the upper before the temperature of the mold is raised.

  Moreover, it is preferable that the outsole and the semi-finished shoe sole are bonded together in advance and then inserted into the mold cavity.

  The mold includes two side molds facing each other and a lower mold sandwiched between the two side molds facing the shoe mold, each of the two side molds and the lower mold It is preferable that a flow path is provided in the interior of the chamber so that the temperature of each mold can be adjusted via the flow path.

  In the above shoe manufacturing method, the outsole is preferably made of a thermoplastic material.

  The thermoplastic material is preferably one of EVA resin (ethylene-vinyl acetate copolymer resin), TPR resin (trans-1,5-polypentenemer rubber), and TPU resin (thermoplastic polyurethane resin).

  According to the present invention, the semi-finished shoe sole that has been foamed in advance is combined with the upper while performing heat treatment for softening in the mold and then cooled to the volume of the product shoe sole. The shrinkage rate is easy to predict, and even if the molding pressure and molding temperature are not precisely controlled, the shrinkage rate error is small, so that it is possible to suppress the occurrence of insufficient molding materials and protrusion.

Furthermore, in the present invention, the mold is heated to 110 ° C. to 150 ° C., and while the semi-finished shoe sole whose volume is 12% to 45% larger than the product shoe sole is heated, 15 to 75 kg depending on the shoe mold. / Cm ² pressure is applied to the semi-finished shoe sole, so that the semi-finished shoe sole adheres to the upper while progressing its softening and shrinkage, so that the right-sized product shoe sole can be obtained, and the product sole Adhesion on both the upper and lower sides of the film will be strong.

  Therefore, according to the present invention, it is possible to effectively reduce the waste of the molding material for preventing the shortage of the molding material, and it is possible to manufacture a shoe having a strong sole structure by a simple method.

  Hereinafter, preferred embodiments of a shoe manufacturing method according to the present invention will be described with reference to the drawings. FIG. 1 is a flowchart of the present embodiment, FIG. 2 shows the configuration and installation relationship of each material and member, and FIG. 3 shows an outsole 10, a semi-finished insole 20, and an upper 30 as a mold. It is sectional drawing of the metal mold | die 50 when it inserts in 50 cavities. If each process is performed in the order shown in FIG. 1, a shoe capable of obtaining the effects of the present invention can be manufactured.

  Preparation steps such as outsole preparation, semi-finished shoe sole preparation, upper preparation, shoe mold and mold preparation in the present invention have no relationship before and after, and can be arbitrarily changed in order or prepared simultaneously. In this embodiment, an outsole is first prepared (S101). As shown in FIG. 2, the prepared outsole is a single piece, as shown in FIG. 4, a combination of front and rear parts 10a and 10b, or a combination of three parts and four parts. (Not shown) or the like can be used. For example, rubber can be used as the material. Also, thermoplastic resins such as EVA resin, TPR resin, and TPU resin can be used as the material for the outsole.

  The prepared semi-finished shoe sole 20 is made of thermoplastic EVA resin and has undergone foaming (S102). Referring to FIG. 2, the volume of the semi-finished shoe sole 20 prepared here is 12% to 45% larger than the product shoe sole, and extends upward from the upper surface 21, the lower surface 22, and the periphery of the upper surface 21. The fence 23 is formed.

  Subsequently, in the upper preparation step (S103), the upper 30 having the opening 31, the bottom surface 33, and the side surface 32 is manufactured by combining a plurality of upper materials with a sewing machine so as to include a space for accommodating the foot.

  In the step of preparing a shoe mold and a mold (S104), a mold 50 in which a cavity 53 having a shoe sole shape and a shoe mold 40 that can be inserted into the cavity 53 of the mold 50 are prepared. Referring to FIG. 2, the mold 50 includes two side molds 52 on both sides facing each other and a lower mold 51 facing the shoe mold 40 and sandwiched between the two side molds 52. The shape of the shoe sole is formed on the surface of the lower mold 51 on the shoe mold 40 side. Referring also to FIG. 3, a flow path 54 is provided in each of the two side molds 52, the lower mold 51, and the shoe mold 40 as temperature control means for adjusting the temperature of each mold. . If a heat medium such as hot water or a coolant such as cold water is injected into each channel 54, the temperature of each mold can be controlled and adjusted. Here, the flow path 54 penetrates the inside of the side mold 52, the lower mold 51, and the shoe mold 40, and is provided in pairs. However, the flow path 54 is provided in a meandering shape to improve the efficiency of temperature control and adjustment. can do. Incidentally, the temperature control means of the present invention is not limited to the flow path, and the mold can be heated using means capable of controlling the temperature, such as an infrared heating device or an electromagnetic wave heating device.

  When the above-described members are ready, the process proceeds to a step of manufacturing shoes by bonding the outsole 10, the semi-finished shoe sole 20 and the upper 30 together.

  First, as shown in FIGS. 2 and 3, the upper 30 is covered with the shoe mold 40 through the opening 31, and an adhesive is applied to the outsole 10 and the upper 10. An adhesive application step (S105) is performed in which the adhesive pretreatment agent is applied to each of both surfaces. In this step, an adhesive is applied to the bottom surface 33 and the lower edge of the side surface 32 of the upper 30 and the surface of the outsole 10 to be bonded to the semi-finished shoe sole 20, and an adhesive pretreatment agent is applied to the outsole of the semi-finished shoe sole 20. 10 and upper and lower surfaces 21 and 22 to be bonded corresponding to the upper adhesive.

  Next, as shown in FIGS. 2 and 3, the outsole 10, the semi-finished shoe sole 20, and the shoe mold 40 covered with the upper 30 are arranged in the cavity 53 of the mold 50 from bottom to top in this order. A charging step (S106) is performed. In this charging step, the upper 30 and the semi-finished shoe sole 20 can be bonded in advance and then inserted into the cavity 53. In this embodiment, the outsole 10, the semi-finished shoe sole 20, and the shoe mold 40 covered with the upper 30 are inserted into the cavity 53 at room temperature. It is also possible to apply an adhesive or a pre-adhesive treatment agent after heating to 100 ° C. to 100 ° C. and insert it into the cavity 53.

Then, a heat medium is injected into each flow path 54 to raise the temperature of the mold 50 to 110 ° C. to 150 ° C., and at the same time, the pressure of 15 to 75 kg / cm ² is reduced by half by the shoe mold 40 covered with the upper 30. A softening bonding step (S107) is performed in which the semi-finished shoe sole 20 is softened by being hung on the product shoe sole 20 and bonded together with the outsole 10 and the upper 30 in accordance with the shape of the cavity 53.

  In this softening and bonding step, the semi-finished shoe sole 20 is heated by the mold 50 and softens, and at the same time, deforms in accordance with the shape of the cavity 53 and can be firmly bonded to the outsole 10. In addition, the pressure from the shoe mold 40 is applied to the semi-finished shoe sole 20 through the upper 30, and the fence 23 on the upper surface and upper peripheral edge of the upper half-finished shoe sole that has been softened and deformed with heat from each flow path 54 The upper 30 can be firmly attached to the bottom and side surfaces of the upper 30 and firmly bonded. In addition, if the bottom surface 31 of the upper 30 is previously formed in a fine hair shape or an uneven shape, there is an effect of further strengthening the adhesion between the semi-finished shoe sole and the upper 30.

  This softening and bonding step is performed for 1 to 7 minutes, and after completion, the supply of the heat medium is stopped, and instead a cooling step (S108) is performed to cool the mold 50 by injecting the refrigerant into each flow path 54, The semi-finished shoe sole 20 is cooled to the size of the product shoe sole.

  Finally, the shoe in which the outsole 10, the product shoe sole, and the upper 30 are integrated from the cavity 53 is taken out, and a finishing step (S 109) for removing the protrusion of the product shoe sole is executed to complete the shoe.

  By the way, in the above manufacturing method, the outsole 10 and the semi-finished shoe sole 20 are prepared and bonded to form a product shoe sole, but the semi-finished shoe sole 20 and the upper 30 are only made of gold without preparing the outsole 10. The semi-finished product sole 20 can be softened and contracted by being inserted into the cavity 53 of the mold 50 to form a product shoe sole.

  Further, in the shoe manufacturing method of the present invention, installation of reinforcing members such as reinforcing sheets and reinforcing strips can be added to the manufacturing method.

  Next, the advantages of the shoe manufacturing method of the present invention are summarized as follows.

  First, in the present invention, the shoe sole is inserted into the cavity 53 of the mold 50 in a foamed semi-finished product, and is softened into the cavity 53, and at the same time, is bonded to the outsole 10 and the upper 30. This method can be performed more easily than conventional injection molding of shoe soles, and problems such as lack of molding material and protrusion due to the mold exhaust system, molding pressure, and molding temperature are greatly eliminated.

Furthermore, the present invention increases the temperature of the mold 50 to 110 ° C. to 150 ° C., and heats the semi-finished shoe sole whose volume is 12% to 45% larger than the product shoe sole. Since a pressure of 75 kg / cm ² is applied to the semi-finished shoe sole, the semi-finished shoe sole adheres to the upper while progressing its softening and contraction, so that a product shoe sole of the right size can be obtained, and the product shoe Adhesion on both the top and bottom sides is also strong.

Furthermore, the present invention applies a pressure of 15 to 75 kg / cm ² by the shoe mold 40 to the semi-finished shoe sole 20 while heating the semi-finished shoe sole by heating the mold 50 to 110 ° C. to 150 ° C. The semi-finished product sole 20 can be cooled and bonded to the outsole 10 and the upper 30 while the softening of the semi-finished product sole 20 is progressed. The fence 23 on the periphery of the upper surface of the product shoe sole can also be strongly attached to the upper 30.

  According to the above configuration, the shoe manufacturing method of the present invention combines the pre-foamed semi-finished shoe sole with the upper and the outsole while performing heat treatment for softening in the mold. The shrinkage rate is easy to predict, and even if the molding pressure and molding temperature are not precisely controlled, the shrinkage rate error is small, so that it is possible to suppress the occurrence of insufficient molding materials and protrusions.

Further, in the present invention, the mold 50 is heated to 110 ° C. to 150 ° C. to heat the semi-finished shoe sole whose volume is 12% to 45% larger than the product shoe sole. since applying pressure of ~75kg / cm ² in the semi-finished product sole products and semi-sole to obtain a product soles just the right size is cooled to adhere the outsole and upper while advancing the softened And the upper and lower surfaces of the product sole can be firmly bonded.

  Therefore, according to the present invention, it is possible to effectively reduce the waste of the molding material for preventing the shortage of the molding material, and it is possible to manufacture a shoe having a strong sole structure by a simple method.

It is a flowchart of the shoe manufacturing method of preferable embodiment of this invention. It is explanatory drawing which shows the structure and installation relationship of each member in this embodiment. It is sectional drawing of a metal mold | die when performing a softening adhesion process. In the case of an outsole combined by two front and rear parts, it is an explanatory diagram showing the configuration and installation relationship of each member.

Explanation of symbols

10 Outsole 10a, 10b Outsole component 20 Semi-finished shoe sole 21 Upper surface 22 Lower surface 23 Fence 30 Upper 31 Opening 32 Side surface 33 Bottom surface 40 Shoe mold 50 Mold 51 Lower mold 52 Side mold 53 Cavity 54 Flow path (Temperature control means )

Claims (10)

Providing a semi-finished shoe sole that is 12% to 45% larger in volume than the product shoe sole through foaming, an upper, and a mold having a shoe mold and having a cavity formed around the shoe mold;
After the upper is covered with the shoe mold, the semi-finished shoe sole is placed on one surface that is coupled to the shoe sole of the upper so that the upper and the semi-finished shoe sole are inserted into the cavity of the mold. And a process of
Softening the semi-finished shoe sole by heating the mold to 110 ° C. to 150 ° C., and bonding it integrally with the upper according to the shape of the cavity;
And a step of cooling the mold again to shrink the semi-finished shoe sole to a volume of the product shoe sole. In the step of raising the temperature of the mold, the shoe mold covered with the upper applies a pressure of 15 to 75 kg / cm ^{2 to} the semi-finished shoe sole to firmly connect the upper and the semi-finished shoe sole. The shoe manufacturing method according to claim 1, wherein the shoe manufacturing method is performed.   The shoe manufacturing method according to claim 1, wherein a fence is formed to extend upward on a surface of the semi-finished shoe sole that is bonded to the upper edge.   The shoe manufacturing method according to claim 1, wherein the shoe mold is heated and cooled together with the mold.   The shoe manufacturing method according to claim 1, wherein the semi-finished shoe sole is preheated to 50 to 120 ° C before being inserted into the cavity.   2. The method according to claim 1, further comprising a step of inserting an outsole into a cavity of the mold so as to sandwich the semi-finished shoe sole from both sides of the upper before the temperature of the mold is increased. Shoes manufacturing method.   The shoe manufacturing method according to claim 6, wherein the outsole and the semi-finished shoe sole are bonded in advance and then inserted into the cavity of the mold.   The mold includes two side molds facing each other and a lower mold sandwiched between the two side molds facing the shoe mold, each of the two side molds and the lower mold The shoe manufacturing method according to claim 1, wherein a flow path is provided in the interior, and the temperature of each mold can be adjusted via the flow path.   The shoe manufacturing method according to claim 6, wherein the outsole is made of a thermoplastic material.   The shoe manufacturing method according to claim 9, wherein the thermoplastic material is any one of EVA resin, TPR resin, and TPU resin.

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