KR20110044605A

KR20110044605A - A method for manufacturing a metal plate integrated mid-sole

Info

Publication number: KR20110044605A
Application number: KR1020090101365A
Authority: KR
Inventors: 임희순
Original assignee: 임희순
Priority date: 2009-10-23
Filing date: 2009-10-23
Publication date: 2011-04-29

Abstract

PURPOSE: A method for manufacturing a metal plate integrated midsole is provided to manufacture a midsole having an anti-piercing function. CONSTITUTION: A method for manufacturing a metal plate integrated midsole comprises: a first process(S1) of spreading hot-melt adhesive on both sides of a metal plate; a second process(S2) of spreading a heat-melting adhesive on one side of a thermoplastic sponge cut in a fixed size and drying; a third process(S3) of preparing preparations; a fourth process(S4) of throwing a sponge, a metal plate, and preparations into a mold in order; and a fifth process(S5) of putting the mold into a heat press device, molding the thermoplastic sponge, melting the heat-melting adhesive, and adequately cooling the thermoplastic sponge and adhesive.

Description

A method for manufacturing a metal plate integrated mid-sole}

The present invention relates to a midsole manufacturing method, in particular, by using a thermoplastic spin paper, a vinyl acetate copolymer composition adhesive treatment with a metal plate that is used as the inner plate to put in a predetermined mold to press at the same time by pressing in a hot / cold press to simultaneously bond The present invention relates to a method for manufacturing an inner sole plate-integrated midsole for producing an optimal midsole requiring safety in the shoe.

In general, safety shoes are shoes used to protect the foot or the instep from the danger or chemicals, such as falling, impact or sharp objects of the object, the general structure is shown in Figure 1, the body (1) and It includes a core (2), an outsole (3), a midsole (4), an inner board (5), an insole (6), and an insole (7).

Normally, the torso 1 of the safety shoes is the shell of the safety shoes made of leather, the core 2 is a metal or synthetic resin of strength that can protect the toe of the wearer from external pressure and impact, and the outsole 3 is The part is formed on the bottom surface of the safety shoes to prevent the slip of the worker, the midsole 4 is coupled to the upper portion of the outsole 3 and the upper portion is not deformed, the inner board 5 is the ability to respond The part is made of a thin metal or equivalent material to improve the insole, the insole 6 is a part of a flexible, strong and hygroscopic material coupled to the upper portion of the midsole 4 and the inner plate (5), The insole 7 is a part made of a material that is in contact with the sole of the worker to alleviate the impact of the foot and easy sweat absorption and odor removal.

In general, Penetration-resistant insert refers to a plate placed between the midsole and the insole of the safety shoes to prevent sharp objects from penetrating the bottom of the safety shoes and damaging the soles of the workers. According to No. 2003-19 (Article 35, Paragraph 4 of the Protective Equipment Provisions), the inner board 6 is a steel nail made of steel wire using a pressure test device (length 65 ± 3mm, diameter 3.05 ± 0.08mm ) Shall be perpendicular to the puppet of the outsole and have a strength that does not penetrate even under a static load of 50 kgf (490.3 N).

Therefore, conventionally, as shown in Fig. 2, in order to have the above-described strength, one sheet of thin iron plate has been used as the inner plate (5). The inner board 5 is usually joined while positioned between the midsole 4 and the insole 6 of the safety shoe.

However, in the case of the conventional safety shoes, the inner plate is an iron plate and the insole and the midsole are resin products such as polyurethane or butadiene rubber, and the properties thereof are different from each other, and it is difficult for the metal plate to be firmly combined with the insole or the midsole. In addition, when working with safety shoes, there are many cases of sitting and working. In this case, the sole and the metal plate of the safety shoe are bent near the front gingiva, and if this bending action is repeated, due to the difference in the bending strain rate of the sole of the plate and the synthetic resin There is a problem that the insole and the midsole are peeled off from the metal plate. Therefore, there is a fear that the metal plate is separated from the sole, which is also a problem of losing the sole protection function of the safety shoes.

In addition, because the environment in which the safety shoes are working is often uneven, the bending and torsional phenomena repeatedly occur at the bottom of the safety shoes, and sometimes excessive bending deformation occurs. If the repetitive bending and torsional phenomena are not alleviated, fatigue may accumulate in the metal plate and fracture may occur.

When the metal plate is used as the inner plate, various problems as described above may occur. In order to compensate for this, there have been attempts to use a synthetic resin as the inner plate. In this case, due to the similarity of the material, the synthetic resin inner board can be firmly bonded to the insole or midsole, and the bending strain is similar, so that the problem of peeling of the insole or midsole and detachment of the inner board can be solved. Can be.

However, the synthetic resin inner board has the same advantages as above, but is enough to pass the performance test (problem penetrating problem) according to the Ministry of Labor's Notice No. 2003-19 (Article 35, Paragraph 4). There is a critical problem that does not have the strength of, has not been commercialized to date.

Conventionally, in order to form a resin layer around a metal plate in this way, apply | coated surfaces are formed on both sides of a pair of formwork, and a resin layer is formed on the said coating surface, and after placing a metal plate on one of the resin layers, Formwork was bonded to each other.

Various methods for forming such a conventional plywood eventually have the following problems. First, the metal plate is attached to the upper part of the outsole (SOLE) or the upper part of the midsole (MID-SOLE) in the form of post-adhesion in the shoe manufacturing line. It is very difficult to bond with and perfect adhesion with metal plate and midsole on top.

Secondly, the mold is designed to make the feet most comfortable in the shape of a certain height (front, back, arch, etc.) based on the shape of the soles of all the shoes (mild, midsole, and new bone), but since the metal plate is flat It is more difficult to bond and the flexibility of the metal plate itself is very poor.

Thirdly, the sole made of a flat metal plate after bonding does not coincide with the soles of the soles, which makes it difficult to manufacture the shoes.

An object of the present invention for solving the above problems relates to a midsole manufacturing method, in particular by using a thermoplastic spin paper which is a vinyl acetate copolymer composition and adhesive treatment with the metal plate used as the inner plate to put in a constant mold to heat / cold The present invention provides a method for manufacturing an inner board integrated midsole for producing an optimal midsole requiring press resistance in safety shoes by pressing and pressing at the same time.

Characteristic of the method for manufacturing the inner sole plate integrated midsole according to the present invention for achieving the above object is a first step of applying a hot melt adhesive (HOT-MELT) to both sides of a metal plate having an arbitrary shape; A second step of applying a heat-soluble adhesive to one surface of the thermoplastic sponge cut to a predetermined size and drying the coating; A third step of preparing a grind material such as a bottom bottom, a front bottom, a back bottom, and a side surface by a constant magnification of the midsole with a thermoplastic sponge; A fourth step of putting the sponge prepared in the second step at the bottom of the mold, placing the metal plate treated in the first step at the top thereof, and putting the preparations other than the midsole prepared in step 3 thereon; And a fifth step of inserting the injected mold into a heat press to press the thermoplastic sponge to sufficiently mold the thermoplastic sponge, dissolving the heat-soluble adhesive sufficiently, and then moving to the cooling press to sufficiently cool the thermoplastic sponge and the adhesive. have.

As an additional feature of the manufacturing method of the inner sole plate integrated midsole according to the present invention for achieving the above object, the first step is a solvent to cleanly remove various oils, contamination, etc. for the metal plate having an arbitrary shape primarily Washing with; A drying step of drying the metal plate after the washing step and then treating the metal line treatment agent on both sides of the metal plate and drying the metal plate; And an adhesive preparation step of applying both sides of the adhesive for metal to the prepared metal plate and drying the coated adhesive on both sides of the hot melt adhesive, which is generally used in shoes on the applied adhesive.

In addition to the additional feature of the inner plate integrated midsole manufacturing method according to the present invention for achieving the above object, the heat press process in the fifth step is pressure 60 ~ 100kgf / ㎠, temperature 150 ~ 160 ℃, It takes place in a working environment of 400 to 600 seconds.

In addition to the additional feature of the inner plate integrated midsole manufacturing method according to the present invention for achieving the above object, in the fifth process the cold press process pressure 60 ~ 100kgf / ㎠, temperature 4 ~ 12 ℃, It takes place in a working environment of 400 to 600 seconds.

As expected effects due to the above-described features of the present invention, by adhering the inner plate (metal plate) of the safety shoe midsole in the midsole to produce shoes, the adhesion problem can be solved in the production line of the metal and shoe sole different from each other and safety shoes Adhesion with soles, midsoles, and insoles can be achieved perfectly, and the metal plates and thermoplastic sponges can be produced in the form of molds designed with metal plates and thermoplastic sponges by inserting a metal plate into a thermoplastic sponge with a certain magnification, then pressurizing and cooling it. By matching the various parts of the shoe (sole, upper, etc.) and the standard and the height is accurate, the problem in the production line can be completely solved.

In addition, since the metal plate is inserted in the lower part of the midsole, the inner surface of the safety shoes can provide a more comfortable and shock-absorbing safety midsole.

The above object and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is an exemplary view illustrating a method for manufacturing an inner board integrated midsole according to the present invention. As shown in the drawing, an inner hot dip adhesive (HOT-MELT) is applied to a metal plate having an arbitrary shape on both sides. A process for preparing a sheet steel sheet (S1), a step for preparing a midsole thermoplastic sponge (S2) by applying a heat-soluble adhesive to one surface of a thermoplastic sponge cut to a certain size, and a constant temperature for each model of the midsole with a thermoplastic sponge Preparation step (S3) of the parts for forming the midsole for preparing the grinders, such as bottom bottom, bottom front, bottom, side by magnification, and the sponge prepared in the second step to the bottom of the mold In the upper part, the metal plate treated in the first step, the mold preparation step (S4) for injecting the preparations other than the midsole prepared in step 3 on it, and the injected mold heat press It is pressurized into a thermoplastic sponge to be sufficiently molded, the heat-melting adhesive is sufficiently dissolved, and then moved to a cooling press to proceed to a pressurized heat press and a cooling press process (S5) to sufficiently cool the thermoplastic sponge and the adhesive. Lose.

At this time, the processes referred to as S1 to S3 may proceed simultaneously regardless of the order.

At this time, looking at the preparation process of the iron plate for the inner plate in more detail, the step of first washing with a solvent to remove various oils, contamination, etc. for the metal plate having an arbitrary shape, and drying the metal plate after the washing step ( 30 minutes or more), and then a pre-treatment step of treating the metal pretreatment agent on both sides of the metal plate and drying (at least 30 minutes at room temperature); After the above), the adhesive preparation step is applied to both sides of the hot melt adhesive that is commonly used in shoes on the walked adhesive, wherein the room temperature is based on 25 ℃.

On the other hand, when the heat temperature of the drying environment is 60 ~ 80 ℃ it is preferable to have a drying time of about 10 minutes.

In addition, the working environment of the pressurized heat press process has a working environment of pressure 60 ~ 100㎏f / ㎠, temperature 150 ~ 160 ℃, time 400 ~ 600 seconds, pressurized cold press process pressure 60 ~ 100㎏f / ㎠, temperature 4 ~ 12 ℃, working time 400 ~ 600 seconds.

In the above process, the pre-treated mill adhesive coating may be precisely performed once, but twice shows better adhesion.

Here, the specific materials and drug names used in the examples are as follows.

Metal Plate: Commercial Sales Scale 0.5M / M

Sponge: Thermoplastic sponge for shoes made of vinyl acetate copolymer composition

Cleaners and organic solvents: TOLUENE

Pretreatment for metals: CHEMLOK # 205. LOAD KOREA LTD.

Adhesive for metal: CHEMLOK # 6254. LOAD KOR Kyo A LTD.

Sponge adhesive: Heat-soluble adhesive (HOT-MELT type): D-PLY-3210. Dongsung Chemistry

While the invention has been shown and described with respect to the specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Anyone with it will know easily.

1 is an exemplary view showing a structure of a general safety shoes

Figure 2 is a process illustration for explaining the inner plate integrated midsole manufacturing method according to the present invention

Claims

A first step of applying a hot melt adhesive (HOT-MELT) to both surfaces on a metal plate having an arbitrary shape;

A second step of applying a heat-soluble adhesive to one surface of the thermoplastic sponge cut to a predetermined size and drying the coating;

A third step of preparing a grind material such as a bottom bottom, a front bottom, a back bottom, and a side surface by a constant magnification of the midsole with a thermoplastic sponge;

A fourth step of putting the sponge prepared in the second step at the bottom of the mold, placing the metal plate treated in the first step at the top thereof, and putting the preparations other than the midsole prepared in step 3 thereon; And

And a fifth process in which the injected mold is put into a heat press to press the thermoplastic sponge to be sufficiently molded, the heat-melting adhesive is sufficiently dissolved, and then moved to a cooling press to sufficiently cool the thermoplastic sponge and the adhesive. Inner board integrated midsole manufacturing method.

The method of claim 1,

The first step is a variety of oils for the metal plate primarily having an arbitrary shape. Washing with a solvent to remove contamination and the like;

A drying step of drying the metal plate after the washing step and then treating the metal line treatment agent on both sides of the metal plate and drying the metal plate; And

The inner plate integrated type comprising an adhesive preparation step of applying the metal adhesive on both sides of the preparation step to dry on both sides and then applying the hot melt adhesive that is commonly used in shoes on the walked adhesive on both sides. Midsole manufacturing method.

The method of claim 1,

In the fifth step, the heat press process is a pressure plate 60 to 100kgf / ㎠, temperature 150 ~ 160 ℃, timed in the working environment of 400 ~ 600 seconds, characterized in that the inner plate integrated midsole manufacturing method.

The method of claim 1,

The cold press process in the fifth step is the inner sole plate integrated midsole manufacturing method, characterized in that the pressure 60 ~ 100kgf / ㎠, temperature 4 ~ 12 ℃, working time 400 ~ 600 seconds in the working environment.