KR20160133342A - A method for forming a cross-linked foam for shoe parts using this in a film-like base compound yibeuyi - Google Patents

Abstract

The present invention relates to a method for forming shoe parts by using ethylene vinyl acetate (EVA) copolymer having a film shape and used for crosslinking foaming, wherein the copolymer has a thickness of about 0.01 to 2 mm, preferably about 0.1 to 1.0 mm compared to conventionally used sheet type or pellet type having a thickness of not less than a predetermined thickness (usually 2.5 to 3.0 mm) and shoe parts produced thereby. The object of the present invention is to overcome the problems occurring in the prior art when producing shoe parts having different mechanical properties and colors by parts in a single molding body. Conventionally, when one shoe part has two or more kinds of physical properties, the shoe part is completely manufactured by respectively going through a foam molding process and a recombining process. However, the shoe parts having two or more kinds of physical properties of the present invention are easily manufactured through one-time foam molding process as a film which has less variation during processing and is easily processed is used in the production such that a manufacturing process is simplified, manufacturing costs are lowered, and the shoe parts have distinctive colors and properties, no additional joints between parts and clearly separated boundaries, and thus, shoe parts having excellent marketability can be manufactured.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method for forming a shoe part using a crosslinked foaming agent,

The present invention is not limited to a sheet-like or pellet-shaped (usually 3.0-4.0 mm in height, 4-5.0 mm in height) sheet having a thickness of at least a predetermined thickness (usually 2.5-3.0 mm) used conventionally and 0.01 to 2 mm, preferably 0.1 to 1.0 mm The present invention relates to a method for producing shoe parts such as shoe insole, midsole, midsole / outsole integral window and upper using an EVA base compound (ethylene vinyl acetate copolymer) The shoe parts obtained through this method can diversify the hue and appearance of each layer and / or each part of one molded body and can also be used for various mechanical properties such as density, hardness, abrasion, resiliency, compression set, and stiffness / flexibility can be designed and manufactured for each function.

When manufacturing a shoe part such as a unit-sole or the like as an EVA molded article, a EVA basic compound for crosslinking foaming having a hard sheet shape, pellet shape or chip shape having a thickness of 2.5 mm or more and having a nonuniform surface, (Primary process), or by compression molding (secondary process), in accordance with the method of the present invention.

A compression or injection foam molding process (primary process) and a compression molding process (secondary process) using an EVA basic compound for crosslinking foaming, such as a sheet shape used in the production of a conventional shoe part, will be described with reference to Fig. 1 As follows.

In Fig. 1, S denotes a step. Foam molding process (primary process)

(1) Compression Molding Process

A1) Material is selected and weighed in consideration of the volume, physical properties, and expansion ratio of shoe parts (SA1). The material is a cut sheet-type EVA basic compound or a pellet-type EVA basic compound.

B1) The above material is injected into a cavity of an opening / closing mold designed to be reduced in size at a ratio to the volume of the foamed molded product (SB1).

C1) The mold is pressurized and heated for a predetermined time (SC1).

D1) Pressing the mold is released and the mold is quickly opened (SD1).

The volume of the molded body obtained by the expansion of the gas (for example, N2, CO2, etc., differs depending on the chemical structure and type of the blowing agent) and the cell structure simultaneously with the opening of the mold differs depending on the use of the molded body Generally, in the case of the intermediate compact for secondary compression mold, it is about 120-140% of the final compact.

E1) The molded body is cooled in a pressure-removed space for a predetermined time (SE1). Such a process is intended to stabilize the structure and shape stability of individual microcells in a molded body, and to stabilize various aspects such as the volume and physical properties of the molded body to the product design standard dimensions. It is possible to use the molded body obtained in the step E1) as a shoe part through a subsequent processing step such as cutting and bonding, and otherwise, as an intermediate molded body necessary for a compression-re-molding step Is used.

These intermediate moldings have a density of 60-70% or a volume of 120-140% in comparison with the final molded article in preparation for the compression molding process.

(2) Injection molding process

The injection foaming molding process is mainly produced by the following process in the four-star predator molding process of Fig. 1 using a pellet-type EVA base compound.

A2) Pelletized materials are weighed in consideration of the volume, physical properties and expansion ratio of shoe parts (SA2).

B2) The material is introduced into a mold (SB2).

The subsequent process generally proceeds to the following SC2 to SE2 process, but in the special case, the material is softened in a material extruder at a mechanical temperature of about 80-90 DEG C, and then the material is injected into a cooling mold After the material is cooled so as not to be crosslinked and foamed, it is demolded (SB12) and then subjected to the SB1 to SE1 steps of the compression-molding type molding process, but examples thereof are not common.

C2) The mold is pressurized and heated for a predetermined time (SC2).

D1) Pressing the mold is released and the mold is quickly opened (SD2).

E1) The molded body is cooled in the pressure-removed space for a predetermined time (SE2). Compression Re-molding Processes (Secondary Process)

(1) Heat / Cold Mold Compression Molding Process (Heat / Cold Mold Compression Re-molding)

This process is a process for converting the intermediate molded body into a desired final molded body by the compression or injection blow molding process as follows.

F1) The intermediate formed body is forced into the mold (SF1).

The cavity of the mold is designed according to the size and shape of the final formed body, and the material of the mold is usually made of an aluminum alloy material having excellent thermal conductivity.

G1) After the mold is closed, a predetermined temperature and pressure are applied (SG1).

H1) After the mold is cooled, it is demolded (SH1) to obtain a final molded article. The above processes F1) to H1) are heating / cooling-type compression molding molding processes, which are mainly a process of molding a shoe midsole, an outsole, a unit-sole, an insole, Etc. are widely used for thick parts

On the other hand, in the case of the upper part or the insole of the shoe in which the scale of the molded body is thin, a cooling metal type compression molding process is produced as follows.

(2) Cold Mold Compression Re-molding process

F2) The intermediate formed body is heated from the outside of the mold, and then charged into the cavity of the open type cooling mold (SF2).

G2) a predetermined pressure is applied through a core of the metal mold to cold-mold the material (SG2).

H2) pressure is released and the cooled molded article is demolded (SH2) and used as a final molded article. The crosslinked foamed EVA formed by the above primary and secondary processes has the following problems since the primary molded product is manufactured using a hard sheet or pellet.

First, the bottom part of the shoe is required to be differentiated according to its site, and has been proven through many conventional bio-mechanics researches and experiments. In this general example, the lateral side of the rear foot portion of the shoe has a low degree of hardness, a soft physical property, and an arch portion which are easy to absorb the pressure generated in the first contact at the time of walking / It is preferable to effectively arrange the mechanical properties of the material for each part with a hard material or a material for bending and forefoot cushioning in the first half.

However, in order to meet such a demand, EVA molded body materials of conventional shapes have had to use a method of molding each part having different physical properties and then re-joining them.

As shown in Fig. 2, the partially formed bodies A and B are manufactured through S1A to S5A and S1B to S5B, and they are bonded to each other in combination (S6 mu), or in the compression or foam molding step (S3A and S3B) The foamed molded bodies b were subjected to compression molding (S4AB) by mutual combination (S3AB) to obtain a final molded body. However, such a conventional method has a problem that the manufacturing process is complicated and not only the manufacturing cost is increased but also the unity of appearance and function of the bonded part is deteriorated due to the exposure of the bonding part, the penetration between the boundary parts, There was

Secondly, in order to diversify color and appearance design using conventional materials, it has been necessary to manufacture each part, then to join them together, or to solve parts by painting on the surface of the molded body, printing, and the like. However, this is not only limited in its application range, but also has problems such as durability, deterioration of productivity and cost increase.

Third, in order to improve the functions such as abrasion resistance, impact absorbability, stability, and comfortable grip, shoe has to differentiate the physical properties of each part, and to manufacture and join parts for each part in designing and manufacturing.

Fourth, as a conventional material, the selection range of the materials in the cross-linked foam molding process by integrating the midsole and the outsole is narrow, so that sufficient functionality can not be distinguished in each of the single molded articles. For example, it has been difficult to simultaneously realize weight reduction, abrasion resistance, density multiplication by site, and the like on a single molded article at the same time.

Fifth, if a conventional sheet-like or pelletized crosslinked EVA basic compound is used, the manufacturing cost is increased due to an additional manufacturing process and an increase in the number of molds, it is difficult to diversify the physical properties of each part of the molded product, I could not.

Sixth, particularly when a sheet-like material is used, the surface is nonuniform and the deviation of the scale usually has a large deviation (for example, 2.5mm-3.0mm) above a certain thickness, It has been difficult to ensure color reproducibility and consistency for mass production in order to prevent mutual invasion of color / physical properties.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a crosslinked EVA basic compound having a thickness of 0.01 to 2.0 mm, preferably 0.1 to 1.0 mm, It is an object of the present invention to provide a controllable simplified process for manufacturing shoe parts.

Second, it is possible to design / manufacture the necessary physical properties of the shoe part parts that a specific part of the foot reaches through the simplified process, and to improve the functionality and product durability and stability by diversifying various mechanical properties on one final molded body And a method for producing the same.

Third, the present invention aims at solving the limitations of the prior art by enabling various colors and designs for each shoe part, and improving the durability and the merchantability of the product by simplifying the decorative process.

Fourth, it is an object of the present invention to provide a manufacturing method that enables a shoe to have functionality such as abrasion resistance, shock absorbability, and torsion prevention through a simpler process.

Fifth, conventional molding is performed in a simplified process on a single molded body in which the middle and the outsole are integrated to realize various designs. In addition, in the conventional manufacturing method, And to provide a manufacturing method which enables physical properties.

Sixth, the shoe part manufacturing process is simplified and the number of necessary molds is reduced, thereby providing a manufacturing method that can lower the manufacturing cost of high-function shoes.

Seventhly, it is an object of the present invention to provide a manufacturing method which reduces defective shoe production process defects through a simple and reliable process, easily applies all the necessary physical properties and functions required for high-performance shoes, and minimizes deviations in quality during mass production do.

Eighth, it is aimed to provide physical property, designing and application of each parts of shoe parts, and manufacturing security that is easy to control.

Ninth, through the manufacturing method which is easy to plan, apply, and control the physical properties, design, and control for each part of the above shoe parts, it is applicable not only to thick parts such as midsole but also to thin parts such as insole and upper parts And it is an object of the present invention to provide a manufacturing method which is easy to manufacture.

Tenth, another manufacturing method in which another thermoplastic resin and / or rubber can be used together with the EVA resin.

As a means for solving the above problems, the present invention is a method for manufacturing a shoe part using an EVA basic compound for crosslinking foaming,

a1) a calender molding method in conjunction with a roll milling method or a calender molding method in conjunction with an extrusion molding method, and performing a molding operation to form an EVA basic compound film for crosslinking foaming with a thickness of 0.01 mm to 2 mm B1) a step of cutting the produced film according to the volume or shape of the mold, and then combining or laminating the cut film to the mold cavity, or combining and laminating the cut film; and c1) And d1) a foaming molding process for releasing the press of the mold and removing the cover to foam the foil; and e1) a compression molding process for compressing / re-molding the film obtained by the foam molding process into a mold for a finished product The present invention also provides a method of manufacturing a shoe part.

INDUSTRIAL APPLICABILITY As described above, it is possible to provide an EVA base compound (ethylene vinyl acetate copolymer) for crosslinked foaming according to the present invention by using a film having a thickness of 0.01 to 2 mm, preferably 0.1 to 1.0 mm, And can be manufactured through a simplified process that can control details.

Secondly, through the simplified process, the necessary physical properties can be introduced to the shoe part part that a specific part of the foot touches, and the reliability and durability of the final formed article can be enhanced.

Third, new design can be introduced by adding various colors, patterns, and characters to shoe parts.

Fourth, there is an effect of easily introducing or increasing functionalities such as shock absorbing property, abrasion resistance, elasticity, bending property, torsion prevention, and supportability improvement to shoes through a simpler process.

Fifth, when it is necessary to separate the part between the high hardness and the low hardness on the single molding of the middle and the outsole, it is possible to integrate the parts into one part by a much simpler process without further joining the parts with different physical properties There is an effect that can be.

Sixth, the shoe part manufacturing process is simplified, and the number of expensive molds required is reduced, thereby reducing manufacturing cost.

Seventh, through the simple and reliable process, it is possible to lower the product defective rate, to provide the desired functions perfectly, and to reproduce it stably in the mass production.

Eighth, there is an effect of providing manufacturing security where the mechanical property, function, color, and design of each part of the shoe part exceed the conventional limit.

Ninthly, there is an effect that it is possible to easily reproduce the above effects even on parts with a thin scale, and to provide a manufacturing method which can obtain different functions and effects from the conventional ones.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a first and second molding process showing a process for manufacturing a shoe part using a conventional sheet-like or pellet-type EVA basic compound,
FIG. 2 is a process diagram showing a manufacturing process of a shoe part composed of two parts having different physical properties or colors using a conventional sheet-type or pellet-type EVA basic compound,
FIG. 3 is a simplified process diagram showing a process of manufacturing a shoe part using the film-type EVA basic compound according to the present invention,
FIG. 4 is a simplified process diagram showing a process of manufacturing a shoe part using a film-shaped EVA basic compound according to the present invention and a pre-

In order to achieve the above object, the present invention is configured as follows.

The composition of the film having the thickness of 0.01 to 2.0 mm, preferably 0.1 to 1.0 mm, which is the molding material of the crosslinked EVA molded article of the present invention (EVA crosslinking form) is the same as that of the conventional material. That is, the main component is VA (vinyl acetate content), MI (melt index, g / mm), basic component of resin, crosslinking agent, foaming agent and filler. In addition, it is added as a sub ingredient of other various inorganic substances, additives (MgCO 3, TiO 2, CaCO 3, ZnO), added rubber, coloring agent and the like. The formulation-related matters related to the composition ratio between the main component and the subcomponent are differentiated and prescribed according to the desired final product and characteristics of the manufacturing process.

Here is an example:

EVA basic compound (Melt Index 3.0 g / 10 min, VA Content 22-23 wt%); 100 phr

DCP (Dicumyl peroxide) purity 98% as a crosslinking agent; 0.66 phr

JTR-M as blowing agent; 1 phr

Stearic acid; 1 phr

ZnO; 1 phr

Ca-St; 1 phr

MgCO2; 8 phr

TiO2; 1 phr

The film of the present invention can be produced by a general film production method and can be produced by linking at the end of the production process of a conventional sheet-like or crosslinked pelletized molding material containing the above-mentioned materials.

That is, a conventional low-temperature calender film forming method in which a sheet-like or pellet-shaped material for crosslinking foaming is associated with a roll milling method or an extruder method is used. In detail, the conventional material is softened through roll milling through a roll at a temperature of about 50-60 DEG C or an extruder having an internal temperature of about 60-80 DEG C, The film-shaped material is completed through each step such as heating roll, cooling roll, trimming, drawing, winding, and the like. All of the above processes work at as low a temperature as possible in order to prevent premature foaming and crosslinking of the material. Considering the conventional crosslinked EVA blend for shoe parts and the application temperature of the foaming agent in the conventional closed cell structure, The temperature of the material during the film forming is preferably 30 to 80 占 폚.

Since the film of the present invention is precisely molded and has a thickness of 0.01 to 2 mm, preferably 0.1 to 1.0 mm, the thickness of the film is extremely thin compared with that of a conventional sheet-like material having a thickness of usually 2.5 mm or more, The state is uniform.

The film having a difference in hardness and / or color can be produced by preparing a film having a different composition ratio of the main component and the subcomponent, and adding a dye or the like.

In the present invention, in order to vary the mechanical properties of shoe parts and to diversify the design of interior and exterior parts of shoe parts, a plurality of films having different physical properties and colors are cut, After the mold is laminated and / or combined, the mold is heated and pressurized and foamed to obtain a final molded article, which is simple and economical.

The shoe part in the present invention means an upper component, an inner sole, a middle sole, an out sole, a middle sole and a unit sole, and is not limited to any one Do not.

Referring to FIG. 3, the compression foam molding process for producing the shoe parts of the present invention will be described. First, a plurality of EVA films for crosslinking foaming are prepared before proceeding to the compression foam molding step. The film may have the same or different properties such as physical properties and / or color and pattern.

Next, the film is cut to a predetermined ratio according to the volume and shape of the final formed body. (Sa1)

Next, each cut film is laminated and / or put in a mold (Sb1). In this case, the mold used is usually about 130 to 150% of the size of the final molded body, and is designed to be freely deformed , And a metal mold (for example, 50 to 60% of the product standard) manufactured in consideration of the volume and shape of the final formed body is used.

The mold is heated at a constant temperature and pressure (typically 140-160 DEG C for compression molding and 160-170 DEG C for injection molding), but the above temperature and heating time are dependent on the material mixing ratio, the size and shape of the mold, (Depending on the workplace-specific mechanical conditions, etc.) (Sc1), the pressurization is quickly released and the mold is opened (Sd1).

At this time, as the mold is opened, a high-temperature gas such as N 2 or CO 2 is expanded to form a molded body. In the case of a molded body for a secondary compression-molded body, the volume of the final molded body is about 120-140% or 60-70% specific gravity. It is formed according to the conditions of materials and molds formulated and designed considering the compression ratio in secondary molding.

Next, the intermediate formed body is cooled at room temperature in the pressure-removed space for a certain period of time, and a compression material forming step (Se1) is performed.

That is, the intermediate molded body is forcibly injected into a mold designed for the shape and size of the final formed body, and the mold is closed and then pressurized and heated to be molded. Finally, after the mold is cooled, a new shape of the compression-molded material is forcibly stabilized and then demoulding to obtain a final formed body.

This is generally known as a high degree of crystalline structure of the resin, which is one of the common characteristics of EVA, PE, or brown rubber.

Through the above process, even if the physical properties and color of each film are the same, detailed control is possible, and the physical properties of each part of the shoe parts after the final recompression molding can be perfectly equalized. Such physical property matching can be accomplished only by the injection foaming molding method in the past, but it is possible to produce high-quality shoe parts at a lower cost with a simpler process by the manufacturing method of the present invention.

As shown in FIG. 4, each of the films having the same physical properties and / or different designs or the like may be cut and put in a mold, and a conventional sheet-like or pellet-type EVA basic compound or a film- A material A preliminarily molded in a predetermined shape is prepared in advance by vacuum molding or compression molding (Sa2). The above-mentioned material A is referred to as a preforming body. Then, the film-like material B is laminated and / or combined with the material A (Sb2).

Next, the mold is heated and pressed (Sc2), the pressure is released, and the mold is opened to perform foaming (Sd2). After the intermediate formed body is cooled, the compression mold is formed (Se2) through the above-described steps in the mold for final molded body, and the desired shoe parts are obtained by cooling and demolding.

The parts obtained through the above-described method have functions such as shock absorption and torsion prevention, and shoe parts having a new design can be obtained.

Further, in the method of manufacturing a shoe part using the EVA basic compound film for crosslinking foaming according to each step of the present invention, it is possible to easily obtain the functionality or design of a desired shoe part by using a conventional sheet type or pellet type material together. For example, in the step (Sb1 or Sb2) of laminating-combining the mold, the film may be used for the portion having different physical properties, and the remaining portion may be filled with the conventional material.

At this time, the pellet-shaped material may be used as a foamable material in combination with the film-shaped material of the present invention by excluding the foaming process separately and molding by a cold injection molding method.

The shoe part manufacturing method of the present invention may use, in addition to the EVA basic compound for crosslinking foaming, other materials capable of foaming work. For example, it may be kneaded with a EVA basic compound, kneaded, and then kneaded with a thermoplastic resin, a short fiber, a rubber, such as natural rubber, ethylene-propylene rubber, . It can be manufactured by linking with other highly crystalline resins having remoldability. It is also possible to partially work with woven fabrics, nonwoven fabrics and other thermoplastic resins. In connection with these, It is desirable to add a process.

The characteristics of the method of manufacturing a shoe part according to the present invention described above are typically obtained by the method of manufacturing a shoe part between the foam molding step (Sd1 or Sd2), the compression molding step (Se1 or Se2) The shape of the primary foamed molding material and the material before the foam molding process, which are prior to the occurrence of the morphological change of the molding material which is essentially involved in the shoe part manufacturing process, It is easy to meet the demands of different physical properties / functions in each part from inside and outside. The advantage of the present invention is that it can be designed through a conventional molding design analysis equipment and the like, and can be realized by using the film-type EVA basic compound of the present invention up to a minute portion.

This is due to the fact that the change of the material according to each process such as < non-uniform shape sheet / pellet prepared by weighing > conventional < intermediate molded product of 120-140% Was able to control only the total volume and appearance of the single molded body.

The shoe parts according to each manufacturing method of the present invention will be described in more detail by the following embodiments, but the present invention is not limited by the embodiments.

(Example 1)

In preparing the film of the EVA basic compound material, a film having the same mixing ratio of the main component and the subcomponent is prepared, and the following film-shaped EVA basic compound material having a thickness of 0.5 mm is prepared. Unless otherwise specified, the material of the film is an EVA-based compound, as follows.

W1: white, hardness after recompression shore C 50 +/- 2

The W1 material is cut into a reduced shape for each part of the designed shoe part. Thereafter, the above-mentioned materials are put into a mold such that, for example, ten cut W1 films are stacked so that the mold can be filled.

Next, each of the above-described processes is briefly described. The intermediate mold obtained by the compression foaming process is subjected to the compression molding process again to obtain the middle mold as shown in FIG. 5

(Example 2)

In preparation of the film of the EVA basic compound material, films different in blend were prepared so as to have the desired shape and physical properties of the final molded product by differentiating the blending ratios of the main component and the subcomponent, and film-like EVA Prepare basic compound materials.

① W1: White, hardness after recompression shore C 50 +/- 2

② B1: Blue, hardness after recompression shore C 65 +/- 2

③ W2: white, hardness after recompression shore C 40 +/- 2

The W1, B1, and W2 materials are cut into shrunken shapes / shades of each part of the designed shoe parts. Then, the above materials are put in a mold so that the mold can be filled, for example, 6 sheets of W1 film, 1 sheet of B1 film and 3 sheets of W2 film.

(Example 3)

The overall scale of the final molded body is relatively heeled to produce a relatively thin innsole as compared to the midsole. The fore foot of about 3/4 point from the heel is exposed to light during the ignition The following materials are prepared so that the hardness is reduced so that the impact can be absorbed and the arch region has the supporting force.

① W3: White, hardness after recompression shore C 30 +/- 2

② R1: Red, shrink hardness after recompression C 25 +/- 2

- Located in the center of the heel and fore foot

③ B2: Blue, hardness after recompression shore C 40 +/- 2

- inserted into the arch region

The W3, R1, and B2 materials are cut to the hardness / color of each part of the designed shoe parts in a reduced form. Then, the above-mentioned materials were put into a metal mold and two W3 films, two R1 films and one B2 film were put in a mold, and the process was the same as in Example 2. In this case, during the compression molding process described with reference to FIG. 1 A gold type molding method can also be used. And is completed through the above steps.

Since the insole is excellent in impact absorbing property and bending property, it can be applied to conventional general shoes and thus has high commercial value.

(Example 4)

When a shoe part is manufactured by the method of the second embodiment, a preform W3, which is a member of a three-dimensional shape manufactured by a preforming process such as a vacuum forming method, is formed on a part requiring specific physical properties, - Used in combination process.

① W4: white, waveform, hardness shrink after recompression C 55 +/- 2

② W2: white, hardness after recompression shore C 40 +/- 2

③ B3: Blue, hardness after recompression shore C 50 +/- 2

④ R2: Red, hardness after recompression SHORE C 65 + / 2

When the above materials are put into a mold, one W4, six B3 films, three W2 films and one R2 film are combined and put into a mold. The following process is the same as that in Example 1. The W3 material may be injected into the mold laterally or vertically at the time of lamination.

(Example 5)

Prepare the following materials to make the outsole as a foam rubber with a unitsole with a midsole.

① W1: White, hardness after recompression shore 50 +/- 2

② W2: White, hardness after recompression shore 40 +/- 2

③ EPR: black, foamable ethylene-propylene rubber

The W1, W2, and EPR materials are cut in a reduced form to the hardness / hue of each part of the designed shoe parts. Thereafter, the above materials are put into a metal mold in such a manner that seven W1 films, three W2 films, and one EPR film are stacked.

The lamination of these different materials is referred to as a mixed lamination-combining process. The subsequent process is the same as in Example 2. [ After the recompression molding, the EVA resin material layer and the EPR layer are not crosslinked with each other and must be adhered to each other.

(Example 6)

In the laminating-combining process of the shoe part manufacturing method of Example 1, Example 2 or Example 4, various types of perforated films are printed on the lowest layer of the mold in a different color or design on the next layer, The front surface of the final molded body can be effectively combined with the brilliant shoe parts having various visually various effects.

It is preferable that the material to be laid on the lowermost layer is produced by using a film containing an EVA basic compound having mainly abrasion resistance.

Claims (7)

A method for manufacturing a shoe part using an EVA basic compound for crosslinking foaming,
a1) a calender molding method in conjunction with a roll milling method or a calender molding method in conjunction with an extrusion molding method, and performing a molding operation to form an EVA basic compound film for crosslinking foaming with a thickness of 0.01 mm to 2 mm ,
b1) a step of cutting the produced film according to the volume or shape of the mold, and then combining or laminating the cut film to the mold cavity, or combining and laminating the cut film,
c1) a step of closing and heating and pressing the mold,
d1) a foaming molding process for releasing the pressurization of the mold, removing the cover, and foaming;
(e1) A method of manufacturing a shoe part comprising a compression material molding step of compressing / re-molding a film obtained by an expansion molding process into a mold for a finished product. The method according to claim 1,
Wherein the thickness of the EVA film is 0.1 to 1.0 mm. 3. The method according to claim 1 or 2,
Wherein the steps a1) to e1) are a manufacturing process of a middle sole. 3. The method according to claim 1 or 2,
Wherein the steps a1) to e1) are processes for manufacturing an innner sole. 3. The method according to claim 1 or 2,
The at least one film used in the above a1) to e1) is a film improved in physical properties by kneading an EVA basic compound, a thermoplastic resin, a staple fiber and / or a rubber at the time of its production, A method of manufacturing a component. 3. The method according to claim 1 or 2,
And b1) a fabric and / or a nonwoven fabric is used together with the film-type EVA basic compound used in the lamination-combining process. 3. The method according to claim 1 or 2,
Wherein the films used in the steps a1) to e1) have different physical properties and / or colors from each other.

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