KR20160114274A

KR20160114274A - shoes midsole forming apparatus and shoes midsole manufactured using the same

Info

Publication number: KR20160114274A
Application number: KR1020150040479A
Authority: KR
Inventors: 박영설
Original assignee: 박영설
Priority date: 2015-03-24
Filing date: 2015-03-24
Publication date: 2016-10-05
Also published as: KR101923526B1

Abstract

In the present invention, a through hole laterally penetrated through a midsole for use in a footwear is integrally formed, and a molding mark is not formed in the periphery of the through hole and the through hole. A shaft mold is provided so as to cross the inner space of the upper and lower molds The extension portion is seated in the press groove of the upper and lower molds so as to close the end portion of the shaft mold beyond the inner space boundary so as to seal the inside of the mold so as to prevent the raw material from leaking inside the mold when the midsole is foam- A parting line and burr are not formed on the inner surface of the through hole passing through in the lateral direction, and no molding marks are left, and a high-quality midsole can be provided.
Further, the structure of the shaft metal mold is provided symmetrically on both sides so that a pair of midsole is manufactured under the same molding condition, so that the pair of midsole has the same size, weight and elasticity without causing dimensional defect or the like.

Description

[0001] The present invention relates to a midsole forming apparatus and a midsole forming apparatus using the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a midsole for use in a shoe, and more particularly, to provide a midsole having a through hole penetrated laterally.

More specifically, it is intended to prevent any molding marks from appearing in the through hole penetrating through the midsole formed integrally and the surrounding flesh forming the through hole.

In recent years, various designs and functions of shoes have been demanded by various demands of the consumer. In addition to the outdoor and sports industries, differentiated functions as well as lightweight shoes have been proposed.

A typical method to lighten shoes is to make the midsole be lightweight by injecting and molding the midsole with EVA material.

A method of manufacturing a midsole by injection foam molding is a method in which a liquid raw material containing a foaming material is injected into a die formed to a size slightly smaller than the size of a midsole to be manufactured and heat and pressure are applied to the die, The molding is performed in the form of a midsole so as to be foamed. After a predetermined time has elapsed, the mold is opened to open the mold at the same time as the molded product is instantaneously expanded inside the mold, thereby manufacturing a midsole having a desired size. Since the method of manufacturing a midsole by the injection foaming method is well known in the art, it will not be described in detail hereafter.

Meanwhile, in order to pierce the side of the current midsole, a separate midsole having internal grooves formed in a predetermined shape or depth may be provided on each or both sides of the midsole, and then assembled by means of adhesion or the like.

However, since this method implements the midsole by bonding, it is not only difficult to manufacture but also can not guarantee the quality of the product, and the through holes penetrating laterally are less effective in buffering.

Therefore, the applicant of the present application proposed to overcome such a problem by suggesting that the through hole is formed integrally with the side of the midsole which is formed integrally, thereby improving the buffering and eliminating the difficulties in manufacturing due to adhesion and the like Have been proposed.

However, in the above-described injection foaming molding method, it is very difficult to smoothly form through holes penetrating in the lateral direction. The reason for this is that in order to integrally form through holes penetrating in the lateral direction of the midsole, a shaft metal mold should be provided so as to penetrate through the center of the metal mold. In the structure in which the shaft metal mold is closely attached to the inner wall of the mold, It was difficult.

That is, in order to realize a through hole on the side of the midsole, a shaft metal mold for forming a through hole in the midsole is mounted inside the metal mold for forming the midsole. When the shaft metal mold is mounted inside the metal mold, In the case where the midsole is molded under a certain temperature and pressure by a method such as foaming, a gap is formed between the mold and the shaft metal to be fitted in the mold, so that the molded product enters the gap and some or all of the through holes of the midsole There has been a problem of clogging, and a separate processing means has been required to remove such portions.

That is, the injection molding method is characterized in that molding is performed at a very high pressure. When a shaft mold is simply placed in close contact with the inner wall surface of the upper and lower molds, a gap is formed between the shaft and the inner wall of the mold. Therefore, there is a problem that the result of molding is poor. In manufacturing a mold, burr is formed in the result of molding even if a mold is manufactured by precision machining.

Therefore, it is necessary to postproduction after completion of molding, which not only consumes a large amount of mold manufacturing cost, but also has a problem in that the production cost of the sole is increased due to overworking of work equipment and working time as well as excessive worker.

Further, in order to form a through hole penetrating to the side of the midsole, the mold structure of the mold is formed in the same line as that of the shaft mold mounted in the mold, so that the parting line is exposed to the inner wall of the through hole of the molded midsole .

On the other hand, when the midsole is individually molded by injection blow molding, defects of the midsole occur. That is, in the production process, there is a problem that after the rapid opening by the opening of the mold in the production process, the cooling process is performed and the volume is reduced due to the contact with the outside air at a relatively low temperature.

KR 1020130027610 A

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a through-hole, which is formed through a through hole in a lateral direction of a midsole, The present invention has an object of improving the completeness of a molded article without necessity of post-processing.

Another object of the present invention is to provide a method of manufacturing a pair of midsole with one injection mold, thereby shortening the manufacturing time of the midsole and preventing a dimensional defect from occurring between the pair of midsole.

In order to accomplish the above object, the present invention provides a midsole molding apparatus in which an inner space is formed by an upper mold and a lower mold to inject a raw material into an inner space to foam-mold the midsole, And a press groove is formed in the upper and lower metal molds so as to surround the extended portion of the metal mold. By doing so, The raw material is prevented from leaking inside the mold and the parting line and burr are not generated on the inner surface of the through hole penetrating the midsole in the lateral direction.

The shaft metal mold is mounted on a platform for elevating and lowering the molds of the upper and lower molds so that the moldings are separated and protruded when the mold is opened. So that a pair of midsole can be manufactured under the same molding condition.

According to the midsole forming apparatus of the present invention, it is possible to provide a sole that is lightweight, excellent in shock absorbing ability and excellent in restoring force by manufacturing the midsole by injection blow molding, And there is no trace of molding on the periphery of the through hole and the through hole, so that a high quality midsole can be provided.

In addition, since the structure of the cushion portion provided by the through hole can be formed into a bar shape or a ball shape, or a shape without a heel can be manufactured in various shapes, it can satisfy both the design and the function.

Further, since the size of the midsole can be easily adjusted by controlling the amount of the raw material to be injected during molding, it can be manufactured in various sizes besides the standard size which is usually used, thereby reducing the inventory burden and improving the satisfaction of the consumer.

In addition, since no parting line is formed on the inner surface of the through hole and no bur is formed, the durability of the through hole and the quality of the product are improved, and the post processing of the corresponding part is not required in the manufacturing process. Competitiveness can be ensured.

1 is an exploded perspective view showing a structure of a molding apparatus according to the present invention;
Fig. 2 is a view showing the mold opening state in a state in which the midsole is molded by the molding apparatus of the present invention
Fig. 3 is a front view of Fig. 2
Figs. 4 to 8 are cross-sectional views showing a midsole forming step using the molding apparatus of the present invention
9 and 10 are perspective views showing still another embodiment of the shaft mold according to the present invention.
11 to 14 are perspective views of a midsole formed by the apparatus for forming a midsole of the present invention.

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

1, the present invention is characterized in that a shaft metal mold 300 is provided between an upper mold 100 and a lower mold 200. When the upper mold 100 and the lower mold 200 are engaged and molded And the shaft mold is positioned between the upper and lower molds so that the through hole 2 that penetrates the midsole 1 in the lateral direction can be integrally formed.

Inner spaces 120 and 220 are formed in correspondence with each other in the upper mold 100 and the lower mold 200. The inner space 120 of the upper mold 100 is a shape for forming the upper surface of the midsole 1 The inner space 220 of the lower mold 200 may be divided into a shape for molding the lower surface of the midsole 1. [

The upper and lower dies 100 and 200 can be positively positioned by the guide pins 110 and 210. The upper and lower dies are injected into the inner space in the closed state Foam molding.

The shaft mold 300 is provided so as to cross the inner spaces 120 and 220 when the upper mold 100 and the lower mold 200 are closed. When molding the midsole 1 in the mold, The through holes 2 penetrating in the lateral direction can be integrally formed.

The shaft mold 300 may be provided in a plurality of the number of the through holes 2 to be formed in the midsole 1. The structure of the shaft mold 300 may be formed in the inner space of the upper and lower molds 100 and 200, The shaft 320 may be provided so as to traverse the first and second molds 120 and 220 and the extended portion 340 may be provided at the end of the shaft 320 so as to exceed the boundary of the inner spaces 120 and 220 of the upper and lower dies 100 and 200 .

Press grooves 140 and 240 may be formed in the upper and lower molds 100 and 200 so as to surround the extended portion 340 of the mold 300.

That is, the shape of the shaft 320 is preferably a cylindrical or elliptical cylindrical shape, and the upper surface of the shaft 320 is pressed against the press groove 140 of the upper mold 100 The press groove 240 of the lower mold 200 is closely contacted with the horizontal center of the shaft 320 so that the mold can be smoothly closed and opened as well as the extension of the shaft 320 340 and the press grooves 140, 240 are in close contact with each other.

Therefore, it is possible to prevent the raw material from leaking out due to the foaming pressure in the mold when the midsole 1 is formed and to prevent the through hole 2 from being clogged. In this case, no parting line of the mold is formed on the inner surface of the through- So that the burr does not occur.

When the shaft 320 and the extended portion 340 are formed on the platform 360 which is operated to move upward and downward, the shaft mold 300 can be moved up and down when the upper and lower molds 100 and 200 are closed and opened. So that it can be separated from the mold.

At this time, the platform 360 can be mounted on the upper mold 100 to perform an up-and-down operation or an up-and-down operation by mounting the platform on the lower mold 200, May be mounted with an elastic restoring force by the restoring element 362. [

The platform 360 of the shaft metal mold 300 is mounted to the upper mold 100 or the lower mold 200 to have an elastic restoring force by the restoring element 362. After the molding is completed, And is released from the lower mold.

FIGS. 4 to 8 are cross-sectional views illustrating steps of fabricating the midsole according to the present invention. In the injection foam molding of the midsole 1, the upper and lower dies 100 and 200 are first closed and closed, When the mold is opened after the set time, the platform 360 of the shaft mold 300 is sprung up, and the formed product is transferred to the upper mold (100) and the lower mold (200) and is expanded and cooled to complete the manufacture of the midsole.

In the present invention, the platform 360 is mounted on the lower mold 200, and the upper and lower molds 100 and 200 are provided with receiving grooves 160 and 260, respectively, And it can be modified in various forms according to the productivity method or the opening / closing method of the upper and lower dies.

In addition, the upper and lower dies 100 and 200 preferably have a pair of inner spaces 120 and 220 so that a pair of midsole can be manufactured at the same time. For this purpose, The shaft 320 having the extended portion 340 formed therein is symmetrically formed and the press grooves 140 and 240 are symmetrically formed so as to accommodate the extended portion 340 of the shaft in the upper and lower dies 100 and 200, A pair of midsole 1 can be produced at the same time.

That is, the molding method by injection blow molding may vary in size, weight, and elasticity of the molded product depending on the difference in fine molding conditions such as injection amount of raw material, temperature difference and density. The pair of midsole 1 can be formed at the same time so that a pair of midsole having no variation can be manufactured.

Further, when the shaft 320 formed on the platform 360 is formed of a hollow tube, the adhesion of the upper and lower molds to the press grooves 140 and 240 can be further improved by the elastic force of the shaft 320 itself It is possible to further prevent the raw material from escaping into the gap between the molds due to the foaming pressure when the upper mold 100, the lower mold 200, and the shaft mold 300 are closed.

The extended portion 340 may be provided with a coating layer 342 on the surface thereof to improve adhesion with the press grooves 140 and 240.

The coating layer 342 may be coated with a Teflon-coated surface to improve adhesion, or the surface of the coating layer 342 may be made of a metal or a special plastic so as to improve adhesion with the press grooves 140 and 240.

Hereinafter, the midsole made using the above-described midsole forming apparatus will be described in more detail.

The midsole 1 according to the present invention can be injected into a mold using various kinds of synthetic resin capable of foaming as a raw material to perform injection foam molding. Preferably, thermosetting synthetic resin is used as a raw material for the midsole.

The midsole 1 is provided with a plurality of through holes 2 penetrating in the lateral direction so as to have a buffering force so that the inner wall of the through hole 2 as well as the peripheral portion of the through hole 2 are free of parting lines and burrs And the appearance of the through hole is formed to be beautiful.

That is, in the above-described molding apparatus, when the molding is performed by engaging the shaft mold 300 between the upper mold 100 and the lower mold 200, the extension 340 of the shaft mold 300 contacts the upper and lower molds 100 and 200 The upper and lower surfaces of the extension 340 can be prevented from being pressed into the press grooves 140 and 240 by the foaming pressure, So that it is possible to prevent the raw material from leaking out and to improve the quality of the formed product even when the foaming pressure acts strongly in the mold.

In addition, the midsole 1 may be formed such that a plurality of protrusions 4 and an inner portion 5 are repeatedly formed on a lower surface thereof to flexibly move the midsole 1, 2) may be formed to further improve the buffer capacity of the midsole.

At this time, the protrusion 4 may protrude into a hemispherical ball shape.

In addition, when the heel portion for flooring during the walking is formed to be inclined inwardly and inclinedly in the midsole 1, the inclined surface of the heel touches the floor first, and pulling of the backrest muscles occurs. In the next walking step When the toe part is tilted, the body weight is moved toward the front and the muscles of the whole leg are pulled and pressed to improve the effect of the walking motion and to achieve a balanced walking.

1: Midsole 2: Through hole
4: protruding portion 5:
100: upper mold 110: guide pin
120: inner space 140: press groove
160: receiving groove
200: lower mold 210: guide pin
220: inner space 240: press groove
260: receiving groove
300: Axis mold 320: Axis
340: extension part 360: platform
362: restoration element

Claims

1. A midsole molding apparatus in which an inner space (120, 220) is formed by an upper mold (100) and a lower mold (200) to inject a raw material into an inner space to foam-
A shaft mold 300 is provided so as to cross the inner spaces 120 and 220 of the upper mold 100 and the lower mold 200,
The shaft mold 300 has an extension 340 formed on the shaft 320 so as to extend beyond the boundaries of the inner spaces 120 and 220 of the upper and lower dies 100 and 200,
The press grooves 140 and 240 are formed in the upper and lower molds 100 and 200 so as to surround the extended portion 340 of the shaft mold 300 so that parting lines and burrs are not formed on the inner surface of the through- A molding device for forming a midsole in which foam molding is performed.

The method according to claim 1,
Wherein the shaft mold (300) is mounted on a platform (360) that is moved up and down when the upper and lower dies (100, 200) are closed and opened.

3. The method of claim 2,
The platform 360 of the shaft metal mold 300 is mounted to the upper mold 100 or the lower mold 200 with an elastic restoring force by a restoring element 362 so that the mold is opened when the mold is opened, And is separated from the lower mold and protrudes from the lower mold.

4. The method according to any one of claims 1 to 3,
The shaft mold 300 is formed such that the shaft 320 having the extended portions 340 formed on both sides of the platform 360 is symmetrical,
Wherein the press grooves (140, 240) are symmetrically formed in the upper and lower molds (100, 200) so as to accommodate symmetrically extending extensions of the shafts, so that a pair of midsole can be manufactured under the same molding conditions.

5. The method of claim 4,
The shaft (320) is hollowly formed to improve adhesion with the upper and lower molds (100, 200) by self-elastic force. The shaft (320) has through holes formed laterally for buffering.

5. The method of claim 4,
Wherein the extending portion (340) is formed with a coating layer (342) padded on the surface thereof to improve adhesion with the press grooves (140, 240).

The midsole 1 is manufactured by injection foam molding using a thermosetting resin as a raw material and a plurality of through holes 2 are formed to penetrate in the lateral direction of the midsole 1 to have a buffering force, A midsole with a beautiful appearance without parting lines and burrs.

8. The method of claim 7,
Wherein a plurality of protrusions 4 and an innermost portion 5 are repeatedly formed on the lower surface of the midsole 1. The through holes 2 are formed in the protrusions 4 to have a buffering force.

9. The method of claim 8,
Wherein the protruding portion (4) is protruded in a hemispherical ball shape.

10. The method according to any one of claims 7 to 9,
Wherein the midsole (1) is formed such that a heel portion for flooring during walking is inclined in an arcuate shape.