KR101916197B1 - Molding method for manufacturing base plate of shoes - Google Patents

Abstract

The present invention relates to a method for producing a lightweight sole. More specifically, the present invention relates to a method for producing a lightweight sole, which is capable of efficiently molding a midsole and an outsole in one mold while firmly bonding each other. According to the present invention, the method for producing the lightweight sole comprises the following steps: a first step of preparing a preform-shaped midsole material; a second step of inserting an outsole material containing a foaming agent into an outsole molding part of a mold and inserting the midsole material into a midsole molding part of the mold; and a third step of integrally joining the outsole and the midsole by pressing the mold with a hot press to foam the outsole material into an outsole, compressing the midsole material into a midsole, and inserting the outsole material into a contact portion of the midsole material while foaming the outsole material.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing a lightweight sole,

The present invention relates to a method of manufacturing a lightweight sole, and more particularly, to a method of manufacturing a lightweight sole that is capable of forming a midsole and an outsole in one mold efficiently and at the same time firmly joining together.

Generally, the shoe is composed of an outsole constituting a bottom window contacting the ground and a sole comprising a midsole constituting the midsole of the shoe, and an upper which is joined to the upper part of the shoe sole and encloses the foot.

Here, the outsole constituting the bottom window is made of rubber material for anti-slip and abrasion resistance, and the midsole of the middle is made of the same material as urethane in consideration of shock absorbing power.

These outsole and midsole are manufactured through separate processes in respective molds, and then they are adhered through an adhesive to form a sole.

However, in the above-described method, it is necessary to separately manufacture a mold for manufacturing an outsole and a mold for manufacturing a midsole, and then to perform a multi-step process such as buffing, primer, and adhesive application so that it takes a lot of time and effort, There is a problem that the price of the shoe sole increases.

In view of these problems, in recent years, attempts have been made to manufacture outsole and midsole using a single mold.

For example, 'How to make a finished window for shoes' (registration number: 10-0130426) produced a finished window by simply pressing the sponge to make a finished window using preform and unvulcanized rubber sheet.

As another example, although the method of manufacturing the foam window of a shoe (registration number: 10-0130425) was applied to the preform and the foamed outsole, the finished window was made only by the compression pressure of the foamed outsole and the sponge.

As another example, a rubber foam composition (registration number: 10-0842862) for a shoe outsole having dimensional stability and abrasion resistance property is used to produce a foamed outsole, and when it is applied to a shoe, it is deformed by expansion when the mold is opened, In order to solve the serious problem of the size deviation of the product due to the shrinkage, the size of the product is tried to be solved. However, this is the method of heating and pressing by the open foaming method and cooling is the method of releasing the product by opening the mold without pressurization. It is not enough to improve the problems that can not be solved.

Korean Registered Patent No. 10-0130426, Dec. 18, 1997. Korean Registered Patent No. 10-0130425, November 11, 1997 Registered as a member. Korean Registered Patent No. 10-0842862, Jun. 25, 2008 Registered as a person.

It is an object of the present invention to provide a method of manufacturing a lightweight sole that is capable of effectively forming a midsole and an outsole in a single mold while allowing a firm bonding between the midsole and the outsole.

According to an aspect of the present invention, there is provided a method of manufacturing a midsole material, A second step of inserting an outsole material containing a foaming agent into an outsole forming part of a mold and inserting the midsole material into a midsole forming part of the mold; And pressing the mold with a hot press to foam the outsole material into an outsole and compression-molding the midsole material into a midsole, wherein the outsole material is foamed and inserted into a tangent portion of the midsole material, And a third step of integrally joining the shoe sole with the shoe sole.

Preferably, the midsole material in the first step is formed while ethylene vinyl acetate is foam molded.

Preferably, the outsole material of the second step is prepared by blending 10 to 100 parts by weight of ethylene vinyl acetate with 100 parts by weight of petroleum resin based on 100 parts by weight of at least one of natural rubber, butyl rubber, butadiene rubber and acrylonitrile- 1 to 30 parts by weight of a resin, 1 to 10 parts by weight of a crosslinking auxiliary, 1 to 5 parts by weight of a crosslinking accelerator, 10 to 30 parts by weight of a reinforcing agent and 1 to 20 parts by weight of a foaming agent, .

Preferably, the outsole material in the second step is inserted at 50 to 90% of the volume of the outsole forming part.

Preferably, the midsole material in the second step is inserted at a rate of 130 to 200% of the volume of the midsole forming portion.

Preferably, in the second step, an adhesive is applied to the upper surface of the outsole material.

Preferably, in the second step, a hot melt is laminated on the upper surface of the outsole material.

Preferably, in the second step, an adhesive rubber composition is laminated on the top surface of the outsole material, wherein the adhesive rubber composition comprises 40 to 100 parts by weight of an ethylene vinyl acetate resin, 20 to 100 parts by weight of a petroleum resin, And 30 to 150 parts by weight of a metal hydroxide.

Preferably, the outsole material of the second step contains an adhesive rubber composition comprising 40 to 100 parts by weight of an ethylene vinyl acetate resin, 20 to 80 parts by weight of a petroleum resin and 30 to 150 parts by weight of a metal hydroxide with respect to 100 parts by weight of a rubber base material Is further included.

A method of manufacturing a lightweight sole according to the present invention is a method of manufacturing a lightweight sole according to the present invention, wherein a preform-shaped midsole material and an outsole material containing a foaming agent are thermally pressed in one mold, The foam is molded and the midsole material is pressure-formed to firmly bond the outsole and the midsole to improve the dimensional stability.

1 is a conceptual diagram according to a preferred embodiment of the present invention;

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

1 is a conceptual diagram according to a preferred embodiment of the present invention. Referring to FIG. 1 (a), a method in which a sole is manufactured by integrally joining an outsole material o and a midsole material m in a single mold made of a top die 100 and a bottom die 200 The outsole material o and the midsole material m are integrally joined in a single mold made up of the upper mold 100, the lower mold 200 and the intermediate mold 300, And the shoe sole can be manufactured through the first step, the second step and the third step.

First, the first step is a step of preparing a midsole material m in the form of a preform.

That is, the preform is formed by foaming in order to form the midsole M, which is formed by foam molding of ethylene vinyl acetate (EVA).

Particularly, the reason why ethylene vinyl acetate is used as the midsole material (m) is because it is the same material as the ethylene vinyl acetate contained in the outsole material (o), so that the bonding strength with the outsole material (o) improves.

At this time, since the preform-shaped midsole material m is compressed in the midsole forming part, it is preferable to prepare the thickness of the midsole material M thicker than the final formed midsole M in consideration of the spatial margin to be compressed.

It is preferable that the midsole material m is inserted at 130 to 200% of the volume of the midsole forming part of the upper die 100. Therefore, it is preferable to adjust the thickness of the midsole material m It is good to do.

Next, in the second step, the outsole material o containing the foaming agent and the ethylene vinyl acetate used as the midsole material m is inserted into the outsole forming part of the mold, and the midsole material m is formed in the midsole forming part of the mold. .

The upper die 100 and the lower die 200 may be a single die made of the upper die 100 and the lower die 200 as shown in FIG. 1- (a) (300) is selectively prepared.

In addition, the outsole material o may be formed in the outsole forming part of the lower mold 200 to communicate with the air holes 202 through which the remaining surplus materials can be released. This is because there is no space in which the remaining surplus materials can remain in the outsole forming part while the outsole material o is foamed in the process of joining the outsole material o and the midsole material m, So as to improve the product quality.

In the case of FIG. 1- (a), the midsole forming portion is depressed in the upper die 100 to insert the midsole material m for forming the midsole M, and the outsole forming portion is recessed and formed in the lower die 200 The outsole material o for molding the outsole O is inserted and the heat press P provided at the upper and lower portions of the mold is pressed so that the outsole O and the midsole M are integrally joined.

In the case of FIG. 1- (b), the outsole forming portion is recessed in the lower mold 200 to form a space into which the outsole material o for forming the outsole O is inserted. In the intermediate mold 300, The upper mold 100 covers the upper portion of the intermediate mold 300 and presses the thermal press P provided at the upper and lower portions of the mold to press the outsole O and the midsole M) are integrally joined together.

At this time, the outsole material o may be inserted so that it is 50 to 90% of the volume of the outsole forming part. For example, when the volume of the outsole forming part is 4 mm, the outsole material o is cut to a thickness of 2.5 mm .

Since the midsole material (m) is compression-molded, it is inserted at 130 to 200% of the volume of the midsole forming portion.

The outsole material (o) to be inserted into the outsole forming part of the mold should contain a foaming agent, and it is preferable that 100 parts by weight of at least one of natural rubber, butyl rubber, butadiene rubber and acrylonitrile- 10 to 100 parts by weight of vinyl acetate, 1 to 30 parts by weight of a petroleum resin, 1 to 10 parts by weight of a crosslinking auxiliary, 1 to 5 parts by weight of a crosslinking accelerator, 10 to 30 parts by weight of a reinforcing agent and 1 to 20 parts by weight of a foaming agent can do.

Specifically, a rubber composition comprising 10 to 100 parts by weight of ethylene vinyl acetate, 100 to 100 parts by weight of a C5 resin, a C9 resin, a hydrogenated resin, and a mixture of 100 parts by weight of at least one of natural rubber, butyl rubber, butadiene rubber, and acrylonitrile- 1 to 30 parts by weight of any one or more petroleum resins and 10 to 30 parts by weight of a reinforcing agent in a kneader at a temperature of 50 to 80 DEG C (more preferably 70 DEG C) for 5 to 15 minutes (more preferably 10 minutes ), The compound obtained by further mixing 1 to 10 parts by weight of the crosslinking auxiliary, 1 to 5 parts by weight of the crosslinking promoter and 1 to 20 parts by weight of the foaming agent in an open roll is produced in a sheet state, We will explain in more detail below.

First, the base rubber not only improves the abrasion resistance and slip resistance of the outsole (O), but also minimizes the shrinkage of the foaming agent and secures dimensional stability.

As the base rubber, any one or more of natural rubber, butyl rubber, butadiene rubber, and acrylonitrile-butadiene rubber may be selectively used, but not limited to the above-mentioned kind of rubber, and various rubbers may be used.

Second, ethylene vinyl acetate is the same material as ethylene vinyl acetate which is a preform-shaped midsole material (m), and acts to firmly bond the outsole material (o) and the midsole material (m).

If a resin other than ethylene vinyl acetate is used, the reaction with the midsole material (m) is not good, and solid bonding of the outsole (O) and the midsole (M) is not achieved, so that ethylene vinyl acetate has a special meaning .

It is preferable that ethylene vinyl acetate is added in an amount of 10 to 100 parts by weight based on 100 parts by weight of the base rubber. If less than 10 parts by weight is added, bonding between the outsole material (o) and the midsole material (m) However, if it is added in an amount exceeding 100 parts by weight, there is a problem that the mixing power with the base rubber is poor and the physical properties of the outsole material (o) are deteriorated. Therefore, the addition of ethylene vinyl acetate good.

In particular, instead of ethylene vinyl acetate, a material having affinity with ethylene vinyl acetate may be used. Since it must be foamed by a foaming agent during molding, it is preferable to use, for example, 1,2-polybutadiene RB820 having low gas permeability.

Third, the petroleum resin of at least one of C5 resin, C9 resin, and hydrogenated resin means an adhesion improver, which further enhances the adhesion with the midsole material (m).

At this time, if the petroleum resin of at least one of the C5 resin system, the C9 resin system and the hydrogenated resin system is less than 1 part by weight with respect to 100 parts by weight of the base rubber, adhesion of the outsole material (o) and the midsole material (m) If the amount of the petroleum resin is more than 30 parts by weight, the function of each constituent of the outsole material (o) can not be exhibited due to the excess amount of the petroleum resin. Therefore, the petroleum resin is preferably added in the range of 1 to 30 parts by weight.

Fourth, the crosslinking aid functions to stably form outsole (O) by crosslinking outsole material (o).

The crosslinking aid is at least one of sulfur and insoluble sulfur. If the amount of the crosslinking aid is less than 1 part by weight, there is a problem that the abrasion resistance of the outsole (O) is lowered, and 10 parts by weight It is preferable that the crosslinking aid is included in the range of 1 to 10 parts by weight based on 100 parts by weight of the base rubber in consideration of the crosslinking time and the foaming property Do.

Fifth, the crosslinking accelerator enhances the crosslinking property so that the crosslinking agent can fulfill its original role.

At this time, as the crosslinking accelerator, a thiazole derivative such as mercaptobenzothiazole (MBT), dibenzothiazole disulfide (MBTS), zinc salt of 2-mercaptobenzothiazole (ZnMBT), tetramethylthiuram monosulfide (TMTM), tetramethylthiuram disulfide (TMTD), tetraethyl thiuram sulfide (TETD), tetrabutyl thiuram sulfide (TBTD), and dipentamethylenetiuram tetra sulfide (DPTT) Can be used.

If the amount of the crosslinking accelerator is less than 1 part by weight, the amount of the crosslinking accelerator may be insufficient, so that the crosslinking aid may not be adequately crosslinked even though a proper amount of the crosslinking aid is used. The scorch phenomenon progresses and the storage stability may not be good. In addition, the crosslinking accelerator may be contained in an amount of 1 to 5 parts by weight based on 100 parts by weight of the base rubber.

Sixth, the reinforcing agent acts to excellently adjust the density of the outsole (O) to improve workability.

For example, silica may be used as a reinforcing agent. When the amount of silica is less than 10 parts by weight, the workability may be excellent, but it is difficult to control the density of outsole (O). When the amount exceeds 30 parts by weight, , The mechanical strength and abrasion resistance are reduced to a level that is difficult to use as the outsole (O). Therefore, the reinforcing agent is preferably included in an amount of 10 to 30 parts by weight based on 100 parts by weight of the base rubber.

Seventh, the foaming agent functions to bond the outsole material (o) integrally with the midsole material (m) while foaming.

Particularly, when the foaming agent is added in an amount of less than 1 part by weight, the outsole material (o) is not sufficiently foamed so that it can not be easily bonded to the midsole material (m). When the foaming agent is added in an amount exceeding 20 parts by weight, It is preferable that the foaming agent is added in an amount of 1 to 20 parts by weight based on 100 parts by weight of the base rubber.

Additionally, the blowing agent may be selected from the group consisting of azodicarbonamide (ADCA), N, N-dinitrosopentamethylenetetraamine (DPT), 4,4-oxybisbenzenesulfonyl (OHSH), p-toluenesulfonylsemicarbazide (PTSS), and p-toluenesulfonylhydrazide (TSH) can be selected and used.

Foaming agent content 0 3 5 10 20 Pressure increase 0 0 5 kg / cm 2 20 kg / cm 2 28 kg / cm 2

Particularly, the above Table 1 relates to an experiment for measuring an increase in the foaming pressure of the outsole material (o) by the foaming agent content, and 3Phr was not measured numerically in the error range of the conventional pressure and pressure gauge, Seems to be. According to these experiments, as the foaming agent content is increased, the foaming pressure is increased and the pressing force at the time of bonding is increased, thereby confirming that the adhesion failure between the outsole material (o) and the midsole material (m) is eliminated.

Accordingly, the outsole material (o) mixed with the above-described composition has a foaming ratio of 150 to 200%, so that the outsole material (o) is inserted so as to be 50 to 90% You will have room.

On the other hand, an adhesive rubber composition may be laminated on the upper surface of the outsole material o in the second step in order to improve the adhesion between the outsole material o and the midsole material m.

The adhesive rubber composition may comprise 40 to 100 parts by weight of an ethylene vinyl acetate resin, 20 to 80 parts by weight of a petroleum resin, and 30 to 150 parts by weight of a metal hydroxide, based on 100 parts by weight of the rubber base material.

First, the rubber base material is a main component of the adhesive rubber composition, and the reason why the rubber base material is caught mainly by 100 parts by weight is to stably maintain all the mechanical properties of the adhesive rubber composition. Such a rubber base material may be formed by containing 10 to 30 parts by weight of chloroprene rubber and 1 to 90 parts by weight of a reinforcing rubber of at least one of natural rubber, butadiene rubber and styrene-butadiene rubber.

When the amount of the chloroprene rubber (CR) is less than 10 parts by weight, adhesion with the outsole material (o) is not good and the bonding force between the outsole material (o) and the midsole material (m) And when it is added in an amount exceeding 30 parts by weight, the mixing power with the reinforcing rubber is not good, so that it is preferably added in the range of 10 to 30 parts by weight.

Among the reinforcing rubbers, natural rubbers can be used as long as they are known as natural rubbers. For example, natural rubber includes cis-1,4-polyisoprene as a main component, but may also include trans-1,4-polyisoprene in some cases. Accordingly, in addition to natural rubber containing cis-1,4-polyisoprene as a main component, natural rubber including trans-1,4-isoprene as a main component, such as balata, .

Among the reinforcing rubbers, the butadiene rubber is a synthetic rubber. When butadiene rubber is used, the butadiene rubber has an advantageous effect in improving the abrasion resistance of the adhesive rubber composition. For example, the butadiene rubber has a content of cis-1,4butadiene of 96 wt% And may be a high cis-butadiene rubber having a glass transition temperature (Tg) of -104 to -107 ° C. When such a cis-butadiene rubber is used, it has an advantageous effect in terms of abrasion resistance.

The styrene-butadiene rubber among the reinforcing rubbers is also a synthetic rubber, and the styrene-butadiene rubbers have the properties of rubbers which are self-evident in the art, so the description thereof will be omitted.

If less than 1 part by weight of the reinforcing rubber of any one of natural rubber, butadiene rubber and styrene-butadiene rubber is added, it is insufficient to give a reinforcing effect to the chloroprene rubber. If more than 90 parts by weight is added, It is preferable that the reinforcing rubber is contained in an amount of 1 to 90 parts by weight because the thermal power is not good and the physical properties of the adhesive rubber composition are deteriorated.

Secondly, the ethylene vinyl acetate resin is intended to improve the adhesive strength with ethylene vinyl acetate which constitutes the midsole material (m), and the adhesive rubber composition penetrates into the pores or concaves formed on the surface of the midsole material (m) The anchor effect is known to be the effect of bonding.

As can be seen from the above-mentioned paragraphs, the ethylene vinyl acetate resin exhibits an anchor effect with ethylene vinyl acetate of the midsole material (m), and when it is added in an amount of less than 40 parts by weight, a hole finely formed on the surface of the midsole material If it is added in an amount exceeding 100 parts by weight, physical properties of the adhesive rubber composition may be deteriorated and the bonding force with the midsole material (m) may not be improved. Therefore, To 100 parts by weight.

Thirdly, the petroleum resin improves the flowability of the ethylene vinyl acetate resin so that the ethylene vinyl acetate resin acts to improve the penetration into the space formed on the surface of the midsole material (m). In addition to this action, the petroleum resin further improves the tacking performance between the compositions constituting the adhesive rubber composition, thereby improving the mixing properties, dispersibility and processability of other additives and contributing to improvement of the physical properties of the adhesive rubber composition Also.

These petroleum resins may be used in combination with an aromatic resin, an acid modified aromatic resin, an alicyclic resin, a hydrogenated alicyclic resin, an aromatic (C9) resin, a hydrogenated aromatic resin, a C5-C9 copolymer resin, a styrene resin, And a mixture thereof. Any one of them may be selected and used.

The petroleum resin is preferably added in an amount ranging from 20 to 80 parts by weight in order to improve not only the penetration ability of the ethylene vinyl acetate resin but also the adhesion performance and physical properties between the adhesive rubber compositions. If less than 20 parts by weight, the ethylene vinyl acetate resin And the adhesive property is not good. If it exceeds 80 parts by weight, the physical properties of the adhesive rubber composition may be deteriorated. Therefore, the petroleum resin is preferably included in the range of 20 to 80 parts by weight based on 100 parts by weight of the rubber base material Do.

Fourth, the metal hydroxide acts as a basic filler containing a hydroxyl group and serves to improve the adhesion at the interface by an acid-base reaction with ethylene vinyl acetate, which forms the midsole material (m).

If the amount of the metal hydroxide is less than 30 parts by weight, the amount of the metal hydroxide is insufficient to cause an acid-base reaction with the ethylene vinyl acetate of the midsole material (m). If the amount of the metal hydroxide is more than 150 parts by weight, The metal hydroxide is preferably contained in an amount of 30 to 150 parts by weight based on 100 parts by weight of the rubber base material.

However, as the metal hydroxide, any one or more of magnesium hydroxide, aluminum hydroxide, calcium hydroxide, sodium hydroxide and potassium hydroxide may be selectively used, but not always limited to this kind, but various metal hydroxides may also be used.

In addition, a metal oxide, stearic acid, an antioxidant, a surfactant, a cross-linking agent, a cross-linking accelerator, and the like may be additionally optionally added, and such a configuration is obvious to those skilled in the art.

On the other hand, in the second step of the present invention, 10 to 100 parts by weight of ethylene vinyl acetate, 100 to 100 parts by weight of petroleum resin 1, 100 parts by weight of ethylene / vinyl acetate, To 100 parts by weight of a rubber base material were added to the outsole material (o) formed from 1 to 30 parts by weight of a crosslinking aid, 1 to 10 parts by weight of a crosslinking auxiliary, 1 to 5 parts by weight of a crosslinking accelerator, 10 to 30 parts by weight of a reinforcing agent, 40 to 100 parts by weight of an ethylene vinyl acetate resin, 20 to 80 parts by weight of a petroleum resin and 30 to 150 parts by weight of a metal hydroxide may be mixed and then inserted into an outsole forming part.

When the adhesive rubber composition is mixed with the outsole material (o), it is not necessary to use a separate adhesive or the like for adhesion between the outsole material (o) and the midsole material (m), so that the efficiency of the process can be achieved .

Finally, the third step is to pressurize the outsole material o into the outsole O by pressurizing the mold with the hot press P, compressing the midsole material m into the midsole M, Is inserted into a contact portion of the midsole material m while being foamed so that the outsole O and the midsole M are integrally joined.

First, the main reason for using the outsole material (o) that is foamed in this patent is to increase the adhesion. In the case of the existing CMP production method, the outsole is 100% in the outsole space of the mold, and the midsole is compressed to 100% by inserting the midsole into the space by 140% of its volume. On the other hand, when the foaming outsole material (o) is used as in the present invention, foaming pressure of the outsole material (o) is added to the compression pressure of the sponge, so that the foam has a higher adhesive force than the existing process.

Thus, in the third step of the present invention, the outsole material (o) inserted into the outsole forming part of the mold is foam-molded while pushing up the midsole material (m) having the sponge shape of the ethylene vinyl acetate material, Since the outsole (O) is formed, the size of the product can be constantly produced.

In a third step, the mold is heated and pressurized by a hot press P to join the outsole material o and the midsole material m integrally with the outsole O and the midsole M .

Specifically, the mold is heated and pressed under a temperature condition of 150 to 170 DEG C (more preferably 160 DEG C) for 5 to 15 minutes (more preferably 10 minutes) to foam the outsole material (o) And forming an environment so that heat fusion at the interface with the midsole material (m) having a half-formed preform shape can be performed.

Additionally, heating and pressuring the mold to less than 150 ° C or less than 5 minutes is insignificant to achieve a firm bond between the outsole material (o) and the midsole material (m), heating to more than 170 ° C or more than 15 minutes If the pressure is applied, the outsole material (o) or the midsole material (m) melts and the shoe sole can not be made firm, resulting in no productability. o) and the midsole material (m) are bonded to each other to form a sole.

The outsole material o located in the outsole forming part of the lower mold 200 is expanded by the foaming agent and the outsole material having the size corresponding to the space of the outsole forming part O, and the preform-shaped midsole material m located at the midsole forming portion of the upper die 100 is compression molded and completed with the midsole M having a size corresponding to the space of the midsole forming portion.

In other words, the upper surface of the outsole material o is inserted at the interface with the midsole material m while pressurizing the midsole material m as the outsole material o containing the foaming agent is foamed (or expanded) The preform constituting the material m is in a state in which the preform P is pressed by the thermal press P provided at the upper and lower portions of the metal mold and the portion where the outsole material o is expanded, the interface between the outsole material o and the midsole material m is compressed so that the upper portion of the outsole material o is inserted into the lower portion of the midsole material m, Are connected to each other.

According to this process, since the process of applying a separate adhesive is not necessary, the process of the present invention is advantageous in that the adhesive is applied to the upper surface of the outsole material o in the second step, And may include a coating process. After the adhesive is applied to the upper surface of the outsole material o in this way, the mold can be pressed by the hot press P to more firmly bond the outsole material o and the midsole material m.

In other cases, it may include a step of laminating the hot melt on the upper surface of the outsole material (o) in the second step described above for stronger adhesion if necessary.

Thereafter, the present invention is completed by demolding the sole having the outsole (O) and the midsole (M) integrally. The shoe sole has the effect of achieving dimensional stability since the outsole material (o) is foam molded in the mold and the midsole material (m) is compression molded.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention may be embodied otherwise without departing from the spirit and scope of the invention.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to illustrate them, and the scope of the technical idea of the present invention is not limited by these embodiments.

The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of the claims should be construed as being included in the scope of the present invention.

100: Prize money type
200: Lower mold
202: Air hole
300: intermediate mold
m: Midsole material
o: Outsole material
M: Midsole
O: Outsole
P: Heat press

Claims (9)

A first step of preparing a preform-shaped midsole material;
A second step of inserting an outsole material containing a foaming agent into an outsole forming part of a mold and inserting the midsole material into a midsole forming part of the mold; And
The outsole material is foamed into an outsole, and the midsole material is compression molded into a midsole, wherein the outsole material is foamed and inserted into a contacting portion of the midsole material, whereby the outsole and the midsole are integrally formed And a third step of joining the shoe sole to the shoe sole. The method according to claim 1,
Wherein the midsole material in the first step is a non-
Characterized in that ethylene vinyl acetate is formed by foam molding. The method according to claim 1,
Wherein the outsole material of the second step comprises:
Based on 100 parts by weight of the base rubber of any one or more of natural rubber, butyl rubber, butadiene rubber and acrylonitrile-butadiene rubber,
10 to 100 parts by weight of ethylene vinyl acetate, 1 to 30 parts by weight of a petroleum resin, 1 to 10 parts by weight of a crosslinking auxiliary, 1 to 5 parts by weight of a crosslinking accelerator, 10 to 30 parts by weight of a reinforcing agent and 1 to 20 parts by weight of a foaming agent ,
Wherein the shoe sole has a foam ratio of 150 to 200%. The method according to claim 1,
Wherein the outsole material in the second step comprises:
Is inserted at 50 to 90% of the volume of the outsole forming part. The method according to claim 1,
Wherein the midsole material in the second step comprises:
Is inserted at a ratio of 130 to 200% of the volume of the midsole forming part. The method according to claim 1,
In the second step,
Characterized in that an adhesive is applied to the top surface of the outsole material. The method according to claim 1,
In the second step,
Wherein the hot melt material is laminated on the upper surface of the outsole material. The method according to claim 1,
In the second step,
An adhesive rubber composition is laminated on the upper surface of the outsole material,
The adhesive rubber composition comprises
With respect to 100 parts by weight of the rubber base material,
40 to 100 parts by weight of an ethylene vinyl acetate resin, 20 to 80 parts by weight of a petroleum resin, and 30 to 150 parts by weight of a metal hydroxide. The method according to claim 1,
In the outsole material of the second step,
Characterized by further comprising an adhesive rubber composition comprising 40 to 100 parts by weight of an ethylene vinyl acetate resin, 20 to 80 parts by weight of a petroleum resin and 30 to 150 parts by weight of a metal hydroxide with respect to 100 parts by weight of a rubber base material .

Images