JPS6147081B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Conventionally manufactured shoe soles, particularly athletic shoe soles, have good abrasion resistance and anti-slip properties on the contact surface side that contacts the ground, floor surface, etc., and also have good wear resistance and anti-slip properties. was required to be lightweight and have good elasticity.

In order to meet the above-mentioned requirements, conventional shoe soles are made by bonding a foamed rubber or foamed resin material that is lightweight and has good elasticity to a solid rubber material that is crosslinked and has good abrasion resistance. A shoe sole bonded with an agent, or an uncured, unfoamed, lightweight and elastic cellular rubber or resin material, and an uncured, solid rubber or uncured, unfoamed sole with good abrasion resistance. Attempts have been made to manufacture shoe soles by integrally molding a cellular rubber material by heating, pressurizing, vulcanizing, or pressurizing reaction in a shoe sole mold. The conventional manufacturing method for shoe soles mentioned above, for example, is made by adhesively bonding a foamed foam material and a vulcanized solid rubber material to each other by heating and pressurizing and foaming them separately, and then bonding the surfaces with adhesive. After being applied, they are bonded under pressure and then cut and formed into the desired sole shape, which is time consuming and costly. Similarly, an unvulcanized rubber body material and an unvulcanized, unfoamed cellular rubber material, or a plurality of different unvulcanized, unfoamed rubber materials (consisting of different foaming ratio compositions) are delivered into the same mold. The product is then sealed and integrally heated, pressure vulcanized, foamed, etc.
However, since each sole member has different foaming conditions such as foaming rate and foaming pressure, the shape of the sole after foaming is different from the desired one, and the appearance is extremely poor. Alternatively, the soles of the conventional shoe soles mentioned above cannot have designs applied to the side surfaces of the soles, and are formed with a mixture of multiple layers that have an inferior appearance and are of inferior commercial value. It was not possible to contribute to the provision of shoes with high added value.

Furthermore, in place of the above-described manufacturing method for soles, an unvulcanized, unfoamed rubber material is placed inside a lower mold and an upper mold, each having a recess with a desired sole shape and bottom design, and a foamed rubber material is placed thereon. A thermoplastic foam resin material is placed therein, and a mold is heated and pressurized so that the unvulcanized rubber material conforms to the design on the bottom surface of the recess, and the rubber material is molded above it. By biting into and bonding to the cellular resin material, and since the cellular resin material is of good thermoplasticity such as EVA foam, its top, bottom and side surfaces can be formed into desired shapes by heat and pressure. Attempts have been made to manufacture shoe soles with shoe sole shapes and design patterns. (For example, the invention of Patent Application No. 205816 filed in 1982) According to the above-mentioned method for manufacturing shoe soles, a thin uncrosslinked rubber material, uncrosslinked, unfoamed cellular rubber, or cellular rubber material is placed in the mold of the sole. After supplying the resin material and a thick foamed and cross-linked cellular resin material thereon, these supplied materials are integrally molded at once, which significantly reduces the number of steps and allows for decorative patterns to be formed on a part of the outside. However, since the upper cross-linked member in the mold is foamy, the lower uncross-linked member cannot be pressed strongly enough, resulting in a concave part in the upper mold. Since it is only formed into an intermediate sole shape, it is not possible to clearly engrave the desired sole design (especially the uneven design for sliding) on the bottom (contact surface) side of the lower unfinished member, and the upper The upper member and the lower member do not have the specified thickness, and the joint surfaces of both members are jumbled, which not only spoils their appearance, but also does not provide sufficient cushioning, especially in certain parts of the upper member. However, there is a risk that the flexibility of the sole may not be achieved properly.

The manufacturing method of the sole of the present invention not only solves the above-mentioned defects in the manufacturing method of the sole, but also improves the thickness of the upper sole and the lower sole by making the thickness of the upper sole occupy a larger area. In order to improve the flexibility of the sole and make the design of the contact surface of the sole clear, the design of the contact surface of the shoe sole (concavity and convexity) is formed on the upper surface of the lower sole or within the recess on the upper surface side. In addition, a design (convex and concave portions) that corresponds to and meshes with the design (concave and convex portions) of the contact surface of the lower mold is provided on the lower surface of the design, and a lower sole of the shoe sole is provided between the designs of both the lower lid molds. After delivering the uncrosslinked lower bottom material to become the upper bottom material and crosslinking the lower material by heating and pressurizing it, in other words, after making it into a state where it is still somewhat sticky before crosslinking, The upper base material is delivered, and the upper base material and the lower base material are integrally connected between the upper mold and the lower mold, which have a concave portion shaped like the upper base. Since it has good flexibility, it can contribute to providing a sole for athletic shoes that is also comfortable.

A method of manufacturing a shoe sole according to the present invention that can achieve the above objectives will be explained below with reference to the drawings.

First, the manufacturing method of the sole of the present invention is as follows: As shown in FIGS. As described above, an uncured rubber material or thermoplastic resin material, or an uncrosslinked, unfoamed cellular rubber material or cellular resin material b' is prepared as a slightly thin layer of the lower bottom material. The foamed thermoplastic foamed resin material a' and the uncrosslinked foamed resin material b', which serve as the upper sole material, are cut into the shape of the outer periphery of the sole.

The manufacturing method of the sole of the present invention includes an upper mold 3, a storage mold 2 and a lower mold 1, or a lower mold 1, a storage mold 2, left and right middle molds 4, 4 and A mold A consisting of an upper mold 3 is used. First, as shown in FIGS. 2 and 3 I, a design 7 corresponding to the design 13 of the contact surface of the lower sole 12 of the sole B is placed on the upper surface 5 or the recess 5' on the upper surface side from below. The lower molds 1 arranged in the outer peripheral shape of B are substantially flat, and the design 7 is formed on the lower surface side in the upper surface 5 of the lower mold 1 or in the recess 5' on the upper surface side.
A lid mold 2 in which designs 7' that engage with each other are arranged in the shape of the outer periphery of the sole B, and a recess 6 formed in the shape of the upper sole 11 of the sole B and formed in the shape of the outer periphery of the sole B. It has type 3.

Therefore, in the manufacturing method of the shoe sole B of this embodiment using the mold A, first, as shown in FIGS. Similarly, the lower sole 12 member of the sole B is placed on a design 7 that follows the design 13 of the ground contact surface of the sole B in the recess 5'. Slightly thin layer of uncrosslinked rubber material or thermoplastic resin material, uncrosslinked and unfoamed cellular rubber material, cellular thermoplastic resin material, etc.b' was delivered, and the cellular thermoplastic resin material was delivered. The lower mold 1 is covered and closed with the lid mold 2, heated and pressurized, and the foamed thermoplastic resin material b' sealed by the lower mold 1 and the lid mold 2 is applied to the design 7 on the lower surface side of the lid mold 2. ′ and the corresponding uneven parts such as the design 7 of the lower mold 1, and are bridged to the uneven parts of the design 13 on the ground surface of the lower sole 12 of the sole B, or are still somewhat sticky before cross-linking. The lid mold 2 is removed from the top of the upper mold 1 after the molding is made into a state in which it has a natural character. Cellular thermoplastic resin materials that have been crosslinked in this way or are still somewhat sticky before crosslinking, etc.
b' is heated and compressed by the corresponding design 7 of the lower mold 1 and the design 7' of the lid mold 2, so that the desired contact surface of the sole B is formed on both upper and lower surfaces, especially on the lower surface side. Since the irregularities of the shaped design 13 can be formed reliably and clearly, the appearance of the sole B is not impaired, and the lower sole 11 of the sole B has an effective anti-slip effect on the contact surface side. It is possible to form a design on the ground surface. In this case, the lower mold 1 has a transparent hole or an impermeable hole 10' formed in one corner other than the arrangement part of the design 7 provided in the groove 5' on the upper surface side, and the lid mold 2 has a transparent hole or an impermeable hole 10' in the lower mold 1. There is a protruding notch 10 that is inserted into the transparent hole or the impermeable hole 10'. Therefore, when covering and closing the lower mold 1 with the lid mold 2, the notch 10 of the lid mold 2 is inserted into the lower mold 1.
The lid mold 2 is inserted into the through hole or impermeable hole 10' of the lid mold 2.
and the lower mold 1 can be tightly connected. Furthermore, as shown in FIG. 4, the lid mold 2 and the lower mold 1 are provided with low stepped portions 9', 9' at the ends of each in the longitudinal direction (direction along the front-rear direction of the sole B). If the clamping parts 9, 9 having a U-shaped cross section provided separately are also fitted and connected, the above-mentioned two molds 1, 2 can be more strongly connected, and the above-mentioned uncrosslinked and unfoamed cellular thermoplastic resin material can be used. b can be made smoother by desired crosslinking or from a still somewhat sticky state before crosslinking.

Next, the clamping parts 9, 9 that were used to strengthen the connection between the front lower mold 1 and the lid mold 2 that covers and closes it are attached to these lid molds 2.
is removed from the lower mold 1, and then the lid mold 2 is removed from above the lower mold 1, and the foamed thermoplastic resin material b' is placed on the foamed thermoplastic resin material b' on the lower mold 1 in advance. A slightly thick layer of cross-linked foamed thermoplastic resin material a such as EVA or RB is delivered, which will become the upper sole 11 of the shoe sole B, and an adhesive or the like is applied and adhered to the bonding surface with the lower mold 1. cellular thermoplastic resin material
b' and the thermoplastic resin body a are covered and closed with the upper mold 3 and heated and pressurized. In this case, the heating temperature may be 100 to 200 degrees Celsius, which is approximately the same temperature as the temperature at which the foamed thermoplastic resin material b' that will become the lower member 12 of the first sole B, but the heating time is Thermoplastic resin materials, etc.
The heating time for b' is about 5 minutes to less than 10 minutes.
Pressure can be applied for a time of less than a minute. At this time, the above-mentioned thermoplastic resin material a, which is sealed, heated and pressurized between the upper mold 3 and the lower mold 1, is a foamed and crosslinked material such as EVA or RB, which easily softens with heat. Sole B formed on the lower surface side of the upper mold 3
The foamed thermoplastic resin material b' is molded according to the outer circumferential shape of the upper bottom 11 and is pressed downward to fit into the recess 14 on the upper surface side of the above-mentioned cellular thermoplastic resin material b', and is coated and adhered to the bonding surface. Coupled with the fact that the adhesive and/or the foamed thermoplastic resin material b was still in a somewhat sticky state before crosslinking, the adhesive and/or the foamed thermoplastic resin material b were still in a somewhat sticky state, and the adhesive and/or the foamed thermoplastic resin material b' were strongly and integrally bonded to each other. join to. Thereafter, in the upper mold 3 and lower mold 1, the cross-linked foamed thermoplastic resin material a is molded to form the upper sole 11, which is the thick layer of the sole B. The lower bottom 12 is formed of a thin layer and has a design 13 in the form of a ground plane, and the upper bottom 11 and the lower bottom 12 are integrally connected, and a ground plane-like design 13 is formed on the ground plane side of the lower bottom 12. A sole B having the design 13 is crosslinked. After that, the lower mold 1 and the upper mold 3 of the mold A are cooled, and then the upper mold 3 that covers and closes the lower mold 1 is removed, and from inside the lower mold 1, as shown in FIG. The sole B is molded out. At this time, mold A
As shown in FIGS. 2 and 3, the lower mold 1 and the upper mold 3 that cover and close the lower mold 1 have the sides on which the design 7 is formed on the upper surface side of the lower mold 1, similar to the lid mold 2. Through hole or impermeable hole 10' provided in one corner except for:
Notches 10, 10 are provided to be fitted into the holes 9', 10' of the lower mold 1, and the holes 9', 10',
The notches 10, 10 of the upper mold 3 can be fitted into the upper mold 9' to firmly connect the upper and lower molds 1 and 3. Furthermore, the upper mold 3, as shown in FIGS. 4 and 4,
Lower stepped portions 9', similar to the bottom stepped portions 9', 9 provided on the lower mold 1 and lid mold 2, on both end sides in the longitudinal direction (direction along the front-rear direction of the sole B), respectively. 9′
Since the U-shaped holding parts 9, 9, which are also formed separately, fit and fix the lower stepped parts 9, 9 of the upper mold 3 and the lower mold 1, respectively. The bond between both types 1 and 3 can be further strengthened.
In the upper mold 3, lid mold 2, lower mold 1, and clamping parts 9, 9 of the mold A, there is a trademark such as a symbol or letter on the inner wall of the recess 5' of the lower mold 1 or the recess 6 of the upper mold 3, for example. Alternatively, if an uneven engraving 8 for forming the decorative design 14 is provided, when removing the upper mold 3 that covers and closes the lower mold 1, bubbles that have entered the convex part or the concave part of the engraving 8 of the upper mold 3 may be removed. It may be difficult to remove the upper mold 3 due to the molded product b made of thermoplastic resin material or the like.

Therefore, the upper mold 3 is
As shown in the figures and FIG. 7, cut 3 the part of the sole B corresponding to the part where the trademark or decorative pattern 14 is to be displayed, such as the rear heel part or the outer part extending from the rear part of the heel to the arch part. ', 3' and an uneven design 8 forming the decorative pattern 14 of the sole B on the space corresponding to the cuts 3', 3', a part 6' of the recess 6, and the inner wall of a part of the recess 6. It may be used in combination with the side molds 4, 4 formed thereon. The upper mold 3 and the side molds 4, 4 combined therewith
In the first embodiment, the foamed thermoplastic resin material b on the upper surface 5 of the lower mold 1 or in the recess 5' on the upper surface side, which is still somewhat sticky before cross-linking or cross-linking, is transferred to the upper mold 3. After covering with , further side molds 4, 4
What is necessary is to slide it laterally to match the upper mold 8. At this time, the side molds 4, 4 are provided with a notch 10 and a part b' of the recess 6 on the lower surface side in the same way as the first upper mold 3.
10 is fitted into the through hole or impermeable hole 10' of the lower mold 1, and on the other hand, lower stepped portions 9', 9 are provided which are connected to the lower stepped portion 9 of the upper mold 3.
9' is fitted and fixed with the clamping parts 9, 9, and then pressurized at approximately the same heating temperature and for approximately the same time as in the manufacturing method of the sole B of the first embodiment. After the heating and pressing, the clamping parts Remove the side molds 4, 4 by sliding them laterally. In this case, the side molds 4, 4 are not removed in the same upward direction as the upper mold 3, so the convex portions or recesses of the decorative pattern 14 on the sole B etc. It will not be damaged by removal due to Next, the upper mold 3 is removed and the upper bottom 1
1 part and the lower sole part 2 are integrally molded, and a sole B expressing the desired decorative pattern 14 on the outer side of the heel side of the upper sole part 11 or the side from the heel part to the non-stepping part can be molded. can. Unlike conventional soles, the sole A is not only one of the most important soles for athletic shoes, as the design 13 of the unevenness on the surface of the sole is clearly and accurately expressed, and the appearance is very good. Not only does it have a sufficient anti-slip effect, but it also has good cushioning properties in the recess on the top side of the lower bottom 12.
Since the upper sole 11 parts made of EVA or RB are joined together by biting, it is possible to contribute to providing a shoe sole with many effects such as improved cushioning properties and a stronger connection between the two parts.

[Brief explanation of the drawing]

Figures 1 to 1 are schematic cross-sectional views of cross-linked thermoplastic cellular resin materials, in which sole members are used in the manufacturing method of the present invention, and figures 1 to 1 are cross-sectional diagrams of cross-linked thermoplastic cellular resin materials, and figures 1 to 1 are cross-sectional diagrams of cross-linked thermoplastic cellular resin materials, and figures 1 to 1 are schematic cross-sectional views of cross-linked thermoplastic cellular resin materials. 1 is a cross-sectional schematic diagram of a thermoplastic resin material. FIG. 2 is an illustration of a schematic cross-sectional view of a mold used in the manufacturing method of the present invention,
is a schematic diagram of an upper mold, a lid mold, and a lower mold used in the first embodiment, and is a schematic diagram of an upper mold, a side mold, and a lower mold used in another embodiment. FIG. 3 and FIG. 3 are schematic plan views of molds, and are the upper mold and storage mold showing the lower side used in the first embodiment, and the lower mold showing the upper surface. These are an upper mold and a side mold showing the lower surface side, and a lower mold showing the upper surface side used for. Figures 4 to 4 are examples of the overall schematic diagram of the mold used in the first embodiment, and are illustrations of the state in which both the upper and lower bottom members are delivered onto the lower mold and covered and closed with the upper mold. 1 is a schematic diagram of the slope, and 2 is a schematic front view of a state in which a bottom member for the lower bottom is placed on the lower mold and covered and closed with a lid mold.
Figures 5 to 5 are examples of overall schematic views of molds used in other embodiments, and are schematic diagrams of slopes in a state where both upper and lower bottom members are delivered onto the lower mold and covered and closed by the upper mold and both side molds. and are illustrations of the same front schematic view. 6 to 7 are schematic cross-sectional views showing the steps of a first embodiment of the manufacturing method of the present invention, and FIG. 7 is a schematic cross-sectional view of another embodiment of the manufacturing method of the present invention. FIGS. 8 to 8 are examples of soles manufactured by the manufacturing method of the present invention, and and are related to the first implementation, and and are related to other embodiments. Reference symbols in the drawings A...Mold, B...Sole, a...Crosslinked thermoplastic resin material, b, b'...Uncrosslinked cellular thermoplastic resin material, etc., 1...Lower mold, 2...Lid mold , 3...
Upper mold, 4... Side mold, 5... Upper surface, 5, 6, 14... Recess, 7, 7', 8, 13... Design, 9... Clamping product,
9'...lower stepped portion, 10...notch, 10'...through hole or impermeable hole, 11...upper bottom, 12...lower bottom.

Claims (1)

[Claims] 1. A method for manufacturing a shoe sole in which an upper sole and a lower sole are molded into an integral shoe sole in a shoe sole mold, which has a lower sole shape and a sole B on the upper surface 5. A slightly thin layer of uncrosslinked rubber material, thermoplastic resin material, uncrosslinked unfoamed cellular rubber material, or A lower mold 1 containing the foamed thermoplastic resin material b' and the like is formed on the upper surface 5 of the lower mold 1 to form a contact surface of the sole B. After covering and closing with a cover mold 2 a lid mold 2 having a design 7′ that meshes with design 7 corresponding to design 13, heating and pressurizing the lid mold 2,
The cellular thermoplastic resin material b' is crosslinked or is not in a state where it is still somewhat sticky before crosslinking, and a design 13 in the shape of the ground plane of the lower sole 12 of the sole B is formed on the lower surface. , and then cross-linked on the upper surface 5 of the lower mold 1 or on the foamy thermoplastic resin material b which is still somewhat sticky before cross-linking and has a recess 15 formed on the upper surface side. Place a slightly thick layer of thermoplastic foam resin material a such as cross-linked foamed EVA or RB coated with an appropriate adhesive on the bonding surface with the foam thermoplastic resin material b′, and The lower mold 1 etc. is covered with the upper mold 3 having a recess 6 formed in the shape of the upper sole 11 of the shoe sole B, and heated and pressurized again. After these thermoplastic resin materials b and the foam resin material a are integrally combined so that a part of the lower surface of the foam resin material a bites into the upper mold 3
The lower mold 1 is cooled, and then the upper mold 3 is removed, and the upper bottom 11 and the lower bottom 12 are integrally joined from above the upper surface 5 of the lower mold 1, and a ground plane-like surface is formed on the lower surface side of the lower bottom 12. A method for manufacturing a shoe sole, comprising molding a shoe sole B having a design 13. 2. The upper mold 3 of the mold A has an engraving 8 on the inner surface of the recess 6 corresponding to the area where a trademark such as a symbol or letter or a decorative design such as a pattern is to be displayed on the outer surface of the shoe sole. A method for manufacturing a shoe sole according to claim 1, characterized in that a shoe sole manufacturing method is provided. 3 The upper mold 3 of the mold A has a deep surface that can be attached and removed by sliding horizontally mainly on the heel side or the area extending from the non-stepping part to the heel on the inner side corresponding to the side surface side of the sole B. It is characterized by a combination of side walls 4, 4 made of separate members forming a part 6' of the recess 6 and having an engraving 8 forming the trademark or decorative design 14 of the shoe sole B on the inner wall thereof. , a method for manufacturing a shoe sole according to claim 1 or 2. 4. Each of the molds 1, 2, 3, 4, and 4 of the mold A has a lower stepped portion 9' formed on the end side of the shoe sole in the front-rear direction, that is, in the longitudinal direction. A method for manufacturing a shoe sole according to any one of Items 1 to 3. 5 The lower mold 1, the lid mold 2, the upper mold 3, and the left and right side molds 4, 4 are provided with fixed frames 9, 9, which are separate members, provided at the end sides in the longitudinal direction and into which the respective lower stepped portions 9' are fitted. 5. The method for manufacturing a shoe sole according to any one of claims 1 to 4, wherein the soles are fitted with each other. 6. The lower mold 1 is characterized in that a design 7 corresponding to the design 13 of the ground contact surface of the lower sole 12 of the sole B is formed in the recess 5' on the upper surface side of the lower mold 1. A method for manufacturing a shoe sole according to any of paragraph 5.