KR20150069703A - Midsole for shoes And Manufacturing Method therefor - Google Patents

Abstract

The present invention comprises: an intermediary layer formed by an intermediary foamable raw fabric having at least one heterogeneous raw fabric insertion hole formed in a vertical direction, and by an insertion foamable raw fabric having physical properties different from the intermediary foamable raw fabric and inserted to the heterogeneous raw fabric insertion hole; a lower layer formed by a lower foamable raw fabric formed in a foot shape and disposed under the intermediary layer; and an upper layer formed by an upper foamable raw fabric having the same shape as the lower foamable raw fabric and stacked on the intermediary layer. The present invention comprises: a raw fabric stack structure preparation step of forming a raw fabric stack structure such that the insertive foamable raw fabric has a shape surrounded by the intermediary foamable raw fabric, the lower foamable raw fabric and the upper foamable raw fabric; a step of forming a midsole preform wherein the raw fabric stack structure is injected to a foaming mold and foamed and molded so that the raw fabric stack structure is integrated to an integrated midsole preform through the forming and molding; and a step of completing a preparation of midsole by hot-pressing and molding the midsole preform.

Description

Technical Field [0001] The present invention relates to a midsole for shoes,

The present invention relates to a method for manufacturing a midsole for a footwear and a footwear midsole manufactured by the method, and more particularly, to a method for manufacturing a footwear midsole by inserting a different kind of material into the midsole, To a method of manufacturing a midsole capable of achieving various functional effects and a midsole for a footwear.

Generally, the shoe consists largely of the sole and the upper which is joined to the upper part of the sole. The outsole is composed of an outsole constituting the bottom window of the shoe and a midsole constituting the midsole of the shoe.

The outsole is made of rubber material to meet wear and anti-slip functions.

The midsole is mainly made of synthetic resin material which is lightweight by reducing the weight of the whole shoe, and expanded and expanded so as to absorb impact and restore power when impact is applied.

Polyurethane foaming resins have mainly been used mainly in the manufacture of such midsole, but recently they are generally made of EVA copolymer (ethylene vinyl acetate copolymer) (hereinafter abbreviated as EVA) foamed molding.

The manufacture of EVA foamed midsole can be roughly divided into two ways.

1) First, a plate-shaped EVA foaming material cut into a required size (in the form of a foot) is obtained after obtaining a plate-like foam, and hot pressed into the press die to obtain a midsole as a finished product. This method has a problem that the material loss rate is large and the processing process is complicated.

2) In the preform method, a foaming material is put into a foaming mold and then heated to maintain crosslinking and foaming to obtain a preform as a primary foam. The preform is hot-pressed to form a midsole .

Such a preform method can be re-classified according to the type of the foamable material put into the foam mold. That is, the method can be classified into a method of injecting a solid foaming raw material into a foaming mold and a method of injecting a liquid foamable material by an injection method.

In addition, in the case of the foaming method using the injection method, a relatively complicated mold structure is adopted, so that it has a technology level to directly obtain the midsole as a finished product by injection foaming.

On the other hand, in recent years, attempts have been made to impart various designs and various properties to the midsole due to the interest in the functionality of the shoes.

However, in order to impart functionality to the midsole, it is widely used to form two foams, respectively, and to bond these two foams by an adhesive.

On the other hand, in the case of the foaming method by the injection method, a technique in which the different materials are integrated at the time of foaming is proposed, but this is limited to a structure having two layers clearly divided up and down.

Korean Patent Laid-Open Publication No. 1986-0003805, entitled " Method for manufacturing shoe soles "(published on June 13, 1986), refers to vulcanization and foaming after lamination of outsole raw material and midsole raw material, It should be understood that the foam has two layers, or more layers, which are clearly divided into upper and lower layers.

In addition, the following prior art documents are considered to be incorporated herein as a general description of the manufacturing method of midsole.

As described above, according to the conventional shoe manufacturing method, it is very complicated to manufacture the midsole, and the loss of the raw material is high, and it is very difficult to impart various functional effects to various parts of the midsole.

Korean Registered Patent No. 0139144 entitled " Method for manufacturing shoe soles using foam preforms "(registered on Feb. 1998, 1998) Korean Patent No. 10-0992070 "Method of manufacturing injection-molded products having different physical properties" (registered on October 29, 2010) Korean Patent Laid-Open Publication No. 1986-0003805 entitled " Method for manufacturing shoe sole "(published on June 13, 1986)

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method and apparatus for inserting a different kind of material into a midsole, The purpose.

Another object of the present invention is to integrate the different kinds of materials inserted into the midsole with the material positioned on the surface of the midsole by foam molding.

According to an aspect of the present invention, there is provided a bubble generator for use in an air conditioner, comprising: an intermediate expandable raw material sheet having at least one or more different kind of raw material insert holes formed therein in a vertical direction; And a lower layer formed by the foamable raw paper for lower part located at the lower part of the intermediate layer and having the same shape as the foamable raw material for the lower part, Forming a top layer by a top foaming raw paper for forming a top layer, and forming a biodegradable laminate such that the expandable biodegradable paper for insertion has a form in which the intermediate foaming raw paper, the bottom foaming raw paper, A laminate preparing step; A preform forming step of putting the clayey laminates into a foaming mold and foam molding to produce a preform for a midsole which is integrated by foam molding of the clayey laminates; Completing the midsole by hot pressing the preform for midsole; And a control unit.

In the above-mentioned preform for midsole, it is preferable that the portion where the intermediate foaming raw paper is foamed has a higher hardness than the portion where the foamable synthetic resin for insertion is foamed.

In the above, it is preferable that the foaming rate of the intermediate foaming raw paper is equal to or higher than the foaming rate of the insertion foaming raw paper for insertion.

In the above, the intermediate layer preferably comprises a plurality of intermediate expandable raw materials stacked on each other.

In addition, a footwear midsole manufactured by the above manufacturing method is provided.

As described above, according to the present invention, it is possible to insert various materials different from the surface of the midsole on the inside of the midsole, which is not visually confirmed from the outside, to achieve various functional effects.

In the present invention, the different kinds of materials to be inserted into the midsole are foam-molded together with the material positioned on the surface of the midsole, so that they are integrated with each other, and no bonding process or the like is required.

In addition, the present invention can be designed to have various cushions inside the midsole in accordance with human walking characteristics and the like.

1 is an exploded perspective view of a clay body according to an embodiment of the present invention,
FIG. 2 is a perspective view showing a state in which a foamable synthetic paper for insertion is inserted into a heterogeneous raw-material insertion port of a medium-
FIG. 3 is a perspective view showing a state in which the raw paper laminate of FIG. 1 is laminated,
4 is a plan view of a midsole completed by hot press forming of a preform for a midsole,
Figure 5 is a cross-sectional view taken along line AA of Figure 4;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention in the drawings, portions not related to the description are omitted, and like reference numerals are given to similar portions throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

FIG. 2 is a perspective view showing a state in which a foamable synthetic paper for insertion is inserted into a heterogeneous raw material insertion port of an intermediate expansion raw fabric in FIG. 1, and FIG. 3 Fig. 4 is a plan view of a midsole completed by hot press forming of a preform for a midsole, and Fig. 5 is a cross-sectional view taken along the line AA of Fig.

Hereinafter, a method of manufacturing a midsole according to an embodiment of the present invention will be described.

(1) Preparation of Biomaterial Laminates

The term " raw paper " as used hereinabove and hereinafter refers to a foamed material in the form of a solid sheet having a certain amount of foaming agent blended therein and having a certain degree of expansion force upon heating. In this embodiment, EVA-based green paper is used, and the foaming rate of the green paper can be adjusted according to the blending ratio of the foaming agent. The higher the blending ratio of the foaming agent, the lower the specific gravity and the more excellent light absorbing property can be obtained.

1 and 3) are prepared by sequentially laminating a lower layer 110, an intermediate layer 120, and an upper layer 130 on the surface of a substrate.

The lower layer 110 located at the lowest position is formed by a foamable raw paper material 110 for a bottom which is formed in a foot shape.

In addition, the uppermost layer 130 located at the uppermost portion is formed by the upper expandable raw paper 130 having the same shape as the lower expandable raw paper 110.

The intermediate layer 120 laminated between the lower layer 110 and the upper layer 130 is formed of at least one intermediate foaming raw paper 121.

The middle foaming raw paper 121 is provided with at least one kind of fresh raw paper inserting opening 121a formed therein in the vertical direction and the intermediate raw expanding raw paper 121 is provided with an intermediate foaming raw paper 121 (See Fig. 2) is inserted.

In this embodiment, the intermediate layer 120 is formed by two intermediate foaming raw paper 121 laminated to each other.

The structure in which two or more intermediate foamable raw paper sheets 121 are stacked can minimize the grinding work for the preform for midsole so that the shape of the preform for the midsole is close to the shape of the midsole.

Due to the structure of the clad laminate 100, the foamable raw paper for embedding 122 is surrounded by the intermediate foaming raw paper 121, the foamable raw paper for lower portion 110 and the foamable raw paper for upper portion 130 I have.

(2) Formation of preform

The prepared raw clay laminate 100 is put into a foaming mold and foamed to produce a preform for a midsole.

The preform for a midsole has a structure in which the greenhouse laminate 100 is integrated by foam molding.

On the other hand, in the structure of the granular laminate 100, the foamable raw paper for insertion 122 is surrounded by the intermediate foamable raw material 121, the foamable raw material for lower portion 110 and the foamable raw material for upper portion 130, Even when the biomass stack 100 is foam-molded, the foaming raw paper 122 for insertion is located only inside the preform for midsole.

The clay body 100 is vulcanized at a temperature of 150 to 200 ° C for about 6 to 15 minutes in a foaming mold. When the foaming mold is opened at the same time as the vulcanization is completed, a preform for a midsole have.

On the other hand, in the preform for a midsole for which foam molding is completed, a portion (corresponding to the surface side of the midsole) foamed by the intermediate foaming raw paper 121 is harder than a portion (corresponding to the inside of the midsole) .

It is preferable that the intermediate foaming raw paper 121, the foamable raw material for lower part 110 and the foamable raw material for upper part 130 have the same physical properties so that the surfaces of the preform for midsole have the same physical properties.

Thus, a cushion body having a proper cushion according to the body part can be formed by the preform for midsole.

It is preferable that the foaming ratio of the intermediate foaming raw paper 121 is equal to or higher than the foaming ratio of the foaming raw paper for insertion 122.

Such adjustment of the foaming ratio may be made such that the foaming ratio of the intermediate foaming raw paper 121, the lower foaming raw paper 110 and the upper foaming raw paper 130 is at least equal to or higher than the foaming ratio of the foaming raw paper for insertion 122 So that the foaming raw paper for insertion 122 is foamed only in the midsole at the time of foaming molding, and its position and the like are fixed.

In this embodiment, the foaming ratio of the intermediate foaming raw paper 121, the lower foaming raw paper 110 and the upper foaming raw paper 130 is 190% to 200%, and the foaming ratio of the foaming raw paper for insertion 122 is 170 % To < RTI ID = 0.0 > 190%. ≪ / RTI >

(3) Midsole completion stage

The preform for a midsole obtained in the step (2) is hot-pressed by a press to complete the midsole 200 as a product (see FIGS. 4 and 5).

The foam 200A having a low hardness is inserted into the completed midsole 200 and the foam 200A having a low hardness is completely surrounded by the foam 200B having a high hardness Thus, the foam 200A having a low hardness is not visually confirmed.

Of course, according to the embodiment, a very large number of low-hardness foam 200A may be disposed inside the midsole 200, thereby providing the midsole 200 with various functions according to the walking characteristics.

On the other hand, prior to the hot pressing of the press, a grinding operation or the like can be performed so that the preform for midsole has a proper shape.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the embodiments described above are intended to be illustrative, but not limiting, in all respects. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100:
110: Lower layer (low-foaming raw paper)
120: middle layer
121: Medium foaming raw paper 121a:
122: foaming raw material for insertion
130: upper layer (foamable raw material for top)
200: Midsole

Claims (5)

Wherein the intermediate foaming raw paper having at least one or more different kind of raw paper inserting holes formed therein in the up and down direction is formed and the intermediate foaming raw paper for inserting the different kind raw paper inserting insert having different physical properties from the intermediate foaming raw paper is formed, And an upper layer is formed by the foamable raw paper for upper part which has the same shape as the foamable raw material for the lower part and is stacked on the upper part of the intermediate layer, Preparing a clay laminate having the form in which the expandable expandable granular material for insertion has a form in which the expandable expandable granular material for the bottom, the expandable expandable granular material for the lower side and the foamable granular material for the upper side are surrounded;
A preform forming step of putting the clayey laminates into a foaming mold and foam molding to produce a preform for a midsole which is integrated by foam molding of the clayey laminates;
Completing the midsole by hot pressing the preform for midsole;
And a plurality of grooves extending in the longitudinal direction.
The method according to claim 1,
Wherein the preform for midsole has a higher hardness than a portion where the foamable intermediate raw fabric is foamed than a foamed foamed synthetic foam for insertion.
The method according to claim 1,
Wherein the foaming rate of the intermediate foaming raw paper is equal to or higher than the foaming rate of the insertion foaming raw paper for insertion.
The method according to claim 1,
Wherein the intermediate layer comprises a plurality of intermediate expandable raw materials stacked one on another.
A midsole for footwear characterized by being manufactured according to any one of claims 1 to 4.

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