CN1680091B

CN1680091B - Production of middle soles of shoes

Info

Publication number: CN1680091B
Application number: CN 200410026765
Authority: CN
Inventors: 林鸿祺
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-04-06
Filing date: 2004-04-06
Publication date: 2010-04-07
Anticipated expiration: 2024-04-06
Also published as: CN1680091A

Abstract

A method for making the insole of shoe includes such steps as preparing central material through cutting the EVA material for shaping and foaming, putting it in the center of mould cavity, injecting the PU material in the mould cavity form the peripheral part, and demoulding. Its advantages are high performance and low cost.

Description

The preparation method at the end in a kind of footwear

Technical field:

The present invention relates to footwear preparation method technical field, refer in particular to the preparation method at the end in a kind of footwear.

Background technology:

The sole of general sport footwear is made of two parts: be arranged in the end (also being fork) in intermediate layer and the big end that is positioned at bottom.Be usually located at the big end of bottom adopts comparatively wear-resisting elastomeric material more, and EVA (be commonly called as rubber glue, its chemical name is an ethene-vinyl acetate fat, English name Ethylene-Vinyl Acetate) expanded material is adopted in the middle level more.This is because the EVA expanded material is the polyethylene goods of countless closed pore bubbles of containing of a kind of chemical framework, and it is a kind of random macromolecular compound, in its molecular structure, the arrangement of substituting group on the axis strand is irregular, and the configuration of asymmetric carbon atom is also different in the strand, arrange also irregularly, so crystallinity is less, and polarity and pliability are higher.Pretend and have more comfortable and damping effect for middle bottom material can make sport footwear.Usually its mode of production that adopts stirs for the mixing of materials such as EVA (ethylene-vinyl acetate fat), blowing agent and bridging agent with scheduled volume, becomes rubber-like EVA expanded material through heating, foaming.As see that application number is: disclose a kind of " manufacture method of the end and periphery contour thereof in the EVA foaming footwear " in 96101232.3 the Chinese invention patent ublic specification of application.Its major programme that adopts is: EVA and foaming mixture material are rolled into the long and flat hectograph, again it is carried out cutting, form Bottom Shape in the footwear that dwindle, the thermal expansion foaming becomes end finished product in the footwear in then it being positioned in 180 degrees centigrade the die material, and all can there be the embossing lines the suitable position of its side and bottom surface or be the specific arc moulding by foaming.Thus can one find out that it is by the foaming and intumescing straight forming of material in mould, reduce so existing by shear, the processing step of edging typing.And it also simultaneously at the carrier of insole binding edge moulding projection, is used for the applying with outer strip.This technology has improved production efficiency of products to a certain extent, but still there is deficiency in it.For example, though it is directly at the carrier of insole binding edge moulding projection, but because it is to adopt expanded foamed technological forming, when the carrier degree of convexity is lower, can pass through this technological forming, but when the degree of carrier projection is higher, just can't form by expanded foamed technology.Even if form, other various physical characteristics of the intensity of its carrier all can reduce greatly, have had a strong impact on the quality of product.

On the other hand, PU is as a kind of thermosetting plastics, and it also is widely used in various fields, and the chemical name of PU is a polyurethane resin, and English name is Polyurethane Resin.It is after the process cure process, can make rigid foam, it has high compressive strength, good heat resistance and dimensional stability, and has an air permeability and good, as see that the patent No. is the Chinese invention patent specification of ZL 92115394.5, it discloses a kind of method for preparing the hard polyurethane foam plastic of perforate.In addition, PU can be directly by the technology mode processing of injection moulding, and it can process various moulding with different demands like this, and its this specific character also makes many shoemaking merchants adopt it as the material of producing shoe-pad or sole.Yet the price of PU is expensive than EVA, directly adopts the PU material, causes the cost of product to improve greatly, makes it the market competitiveness and descends.

Summary of the invention:

The objective of the invention is to overcome the deficiency of present like product, provide a kind of economic, practical, adopt the preparation method at the end in the footwear of different materials and PU material bond material.

The technical solution adopted in the present invention is: at first make the middle part, next is that the middle part that will make is positioned over the central authorities that make bottom die in the footwear, with injection molding way the PU raw material is injected in the peripheral die space in middle part, form outer rim, outer rim and middle part are fixed as one in the injection moulding mode; The middle end that to make at last, is by taking out in the mould.

Above-mentioned middle part is to make after handling through foaming through the EVA material of excision forming.

Above-mentioned middle part is that the coir fibre mattress through the leveling moulding is made through excision forming.

The present invention adopts this method, materials such as EVA, coir fibre mattress and PU material are integrated, be made into the end in the footwear, utilize the middle part of the higher characteristic of the pliability of EVA, coir fibre mattress as the end in the footwear, with comfort and the reinforcement damping effect that improves sport footwear, and can play the effect that reduces cost.Utilize the plasticity of PU simultaneously, the periphery at the end formed outer rim during it was distributed in, and the carrier that is formed at like this on the outer rim can be directly and the outer rim single injection-molded.Even in the shoemaking process, need the centering feather edge to shear or abrasive material in addition, also can directly carry out, this is to have utilized the dimensional stability of PU material good equally, the characteristics that plasticity is strong.

Description of drawings:

Fig. 1 is the perspective view at the end in the footwear produced of the present invention;

Fig. 2 is the front view at the end in the footwear produced of the present invention.

The specific embodiment:

The present invention is a kind of preparation method, Fig. 1,2 is about utilizing the description of product figure of made of the present invention, the end, be made of middle part 1 and outer rim 2 two parts in its related footwear, and wherein middle part 1 can adopt the EVA expanded material to make, and what outer rim 2 adopted is the PU expanded material of process cure process.Outer rim 2 is positioned at the periphery at middle part, and fixes as one by injection molding way and middle part 1.In addition, raising up in the marginal portion of outer rim 2 forms a carrier 21, and this carrier 21 be an integrated injection molding with outer rim 2, and itself and outer rim 2 upper surfaces are that the curve of slyness is excessive.

The method applied in the present invention is: at first make middle part 1, it is to make after handling through foaming through the EVA material of excision forming, but the list of references in the concrete foaming processing reference background technology, and it belongs to prior art, gives unnecessary details no longer one by one here.

Next is that the middle part 1 that will make is positioned over the central authorities that make bottom die in the footwear, and is fixed, and the PU raw material is injected in the die space of 1 periphery, middle part with injection molding way then, forms outer rim 2, and outer rim 2 just fixes as one with middle part 1 after cooling like this.Wherein said PU raw material adopts polyester polyalcohol and curing agent (can adopt isocyanuric acid fat, compound isocyanurating).Certainly also can add other catalyst as required therein.And outer rim 2 is when injection moulding, raises up in its marginal portion to form a carrier 21, and promptly this carrier 21 is an integrated injection molding with outer rim 2.The height of projection of carrier 21 with and outer shape can be by the shape set of mold cavity, even if but the higher also one-shot forming of the height of projection of this carrier 21.

In addition, in the process of injection moulding, it also can be by side or other position injection mo(u)ldings certain decorative pattern or other lines or other moulding of injection molding way in outer rim 2.

This moment, outer rim 2 fixed as one with middle part 1 by taking out in the mould at the middle end that will make at last.

In addition, before injection moulding, can in the PU compound, add a spot of junked tire particle, so not only can reduce the use amount of PU,, also help environmental protection, junked tire can be utilized by secondary to reduce the cost of product.

Another embodiment of the present invention be exactly middle part 1 be to make through excision forming through the coir fibre mattress of leveling moulding, coir fibre mattress also is to use the wider a kind of environment-friendly products of scope at present, adopts it to make not only good permeability of shoe-pad, and cheap.The present invention also can adopt coir fibre mattress as middle part 1, at first be exactly with the coir fibre mattress excision forming, next is that the middle part 1 that will make is positioned over the central authorities that make bottom die in the footwear, and fixed, the PU raw material is injected in the die space of 1 periphery, middle part with injection molding way then, form outer rim 2, outer rim 2 just fixes as one with middle part 1 after cooling like this, forms the end in the footwear.

The present invention adopts this method, materials such as EVA, coir fibre mattress and PU material are integrated, be made into the end in the footwear, utilize the middle part 1 of the higher characteristic of the pliability of EVA, coir fibre mattress as the end in the footwear, with comfort and the reinforcement damping effect that improves sport footwear, and can play the effect that reduces cost.Utilize the plasticity of PU simultaneously, its periphery that is distributed in the middle part is formed outer rim 2, the carrier 21 that is formed at like this on the outer rim 2 can be directly and the outer rim single injection-molded.Even in the shoemaking process, need the centering feather edge to shear or abrasive material in addition, also can directly carry out, this is to have utilized the dimensional stability of PU material good equally, the characteristics that plasticity is strong.

Generally speaking, the present invention combines existing two kinds of different materials, utilizes characteristics separately that the performance of product is improved greatly, and the cost with the control product is arranged.

The above only is this specific embodiment, does not therefore limit protection scope of the present invention, for example can adopt other similar material to substitute coir fibre mattress as middle part 1.

Claims

1. the preparation method at the end in the footwear, at first make middle part (1), it is characterized in that: secondly be that the middle part (1) that will make is positioned over the central authorities that make bottom die in the footwear, with injection molding way the PU raw material is injected in the peripheral die space in middle part (1), form outer rim (2), outer rim (2) and middle part (1) are fixed as one in the injection moulding mode; The middle end that to make at last, is by taking out in the mould.

2. the preparation method at the end in a kind of footwear according to claim 1 is characterized in that: middle part (1) is to make after handling through foaming through the EVA material of excision forming.

3. the preparation method at the end in a kind of footwear according to claim 1 is characterized in that: middle part (1) is that the coir fibre mattress through the leveling moulding is made through excision forming.

4. according to the preparation method at the end in claim 2 or the 3 described a kind of footwear, it is characterized in that: described PU raw material comprises the compound of polyester polyalcohol and curing agent, and it forms outer rim (2) through foaming, sclerous reaction in mould.

5. the preparation method at the end in a kind of footwear according to claim 1 is characterized in that: outer rim (2) is when injection moulding, and raising up in its marginal portion forms a carrier (21), and promptly this carrier (21) is an integrated injection molding with outer rim (2).