Shoe Insole And Manufacturing Method Thereof

Abstract

Disclosed are a shoe insole and its manufacturing method. The method includes the steps of crushing a rubber foam material into irregular primary crushed particles, covering a mixed elastomeric material onto a surface of the primary crushed particle uniformly, using a pressurizing, heating and curing method to form a primary modified foam material, crushing the primary modified foam material again to form irregular secondary crushed particles, covering the secondary crushed particles uniformly mixed with the elastomeric material onto a surface of the secondary crushed particle, and using the pressurizing, heating and curing method to form a secondary modified foam material similarly. The shoe sole made of the secondary modified foam material has good breathability, elasticity, comfortability and compressive strength.

Description

technical field [0001] The invention relates to a manufacturing method for changing the physical properties of an insole made of rubber foam material crushed and combined many times, and increasing the air permeability, elasticity and compression resistance of the rubber foam material. Background technique [0002] It is currently known that the market does not use rubber foam materials such as styrene-butadiene rubber (SBR), neoprene rubber (CR), nitrile rubber (NBR) or a mixture of the above raw materials to make insoles. Because of its foaming material, it is not suitable for making insoles. Commonly used foaming materials for insoles include ethylene-vinyl acetate copolymer (commonly known as EVA) foaming materials, polyurethane foaming materials or natural latex foaming materials. The EVA foam material is made of ethylene-vinyl acetate copolymer (EVA) or its mixture as the main raw material. Its structure is a foam composed of many independent cells. The EVA made of it...

AI Technical Summary

Problems solved by technology

The EVA foam material is made of ethylene-vinyl acetate copolymer (EVA) or its mixture as the main raw material. Its structure is a foam composed of many independent cells. The EVA made of it The advantages of insoles are low raw material prices, easy molding, light foaming density, and no water absorption.

However, in the industry or patent literature, there are many improvement methods aimed at the shortcomings of EVA insoles, and the improvement methods or contents described are nothing more than forming some concave and convex points on the existing EVA insoles. Or concave and convex grooves or the whole surface or part or the top layer plus a layer of breathable cotton gauze or other material layers to achieve the purpose of ventilation, but can not improve other shortcomings

In terms of solving the elasticity of EVA insoles, it is nothing more than adding rubber materials such as POE, EPDM, TPR, IR, NR, SBR, CR and other rubber materials to the EVA raw materials to foam together after mixing. The characteristics of the added rubber improve the elasticity of the overall EVA foam material. Although the elasticity can be improved, it still cannot solve the shortcomings of not being breathable, not resistant to compression, and causing hot and humid feet.

[0003] Another kind of insole is made of two-component PU foaming raw material after direct injection molding and foaming. Its advantages are better resilience than EVA, better air permeability than EVA, easy molding, and low foaming density. It is light, but its disadvantages are poor air permeability, easy to absorb water and sweat, and will produce peculiar smell or odor after long-term accumulation, and it is not resistant to long-term pressure use

In addition, there is also a two-component PU foam insole. The method is to use recycled PU foam material to be crushed into very small strips as fillers, and then add it to the two-component PU foam raw material to foam. Form a breathable PU foam material, which has the advantages of comprehensive air permeability, high elasticity, and high density, but its disadvantage is that it is easy to absorb water and sweat, and it is not easy to discharge, and it will produce unpleasant odor or odor after long-term accumulation. Odor, softness-free comfort

[0004] Another kind of insole is made of natural rubber emulsion as raw material for foaming. Its advantages are good elasticity and softness, but its disadvantage is that it has poor air permeability, and it is easy to absorb water and sweat and is not easy to drain. It will produce unpleasant odor or odor, and it is not resistant to compression, etc.

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