PU sole for shoes

Abstract

The present invention is aimed to provide a shoe sole partly made of PU. The object is realized by a shoe sole having a woven surface layer attached to the surface of an EVA based base layer; a shaped hole formed through the base layer, a PU based air permeable portion filled in the shaped hole; the surface layer and PU based air permeable portion are glued together with the EVA based base layer integrally as a whole. An air permeable portion is mainly located at the middle portion to improve the air permeability thereof. The foot of the user can keep dry and more comfortable by improved air permeable portions. The present invention also has stable structure, prolonged lifetime without deformation by partly adopted PU material. It is beneficiary and advantageous for manufacturers adopting the present invention to guarantee the quality of shoe products.

Description

FIELD OF THE INVENTION [0001] The present invention is related to the technique and products about manufacturing shoes, particularly to a sole partly made of PU. BACKGROUND OF THE INVENTION [0002] Most people are devoted to design a sole with permeability, durability and cost-effective. From conventional sole such as stitching across a canvas strap sole to kinds of modern soles; various modifications about sole materials, sole styles are on sale in the market. R&D focuses on shoe sole seems never stop. For example, Chinese pending patent application no. 86100267 “shoe sole” assigned to Carl Freudenberg & Co. in Germany published on Dec. 3, 1986. It disclosed a shoe sole includes an absorbent layer made of absorbent fibers, and a surface layer secured on top of said absorbent layer. The surface layer is made of woven material with liquid permeability. In which, a layer (1) made of water-repellent fibers, these water-repellent fibers coiled around and threaded through the surface laye...

AI Technical Summary

Benefits of technology

[0005] Accordingly, the primary object of the present invention is to provide a cost-effective, durable and air permeable shoe sole.

[0008] After adopting the structure as mentioned above, an air permeable portion is secured and adapted to the base layer. Thus the air permeable portion enhances the air permeability of a shoe sole. Moreover, the foot of the user will keep dry and more comfortable via the air permeable portion. At the same time, a shoe sole with air permeable portion can be endured longer lifetime in use, PU processing through hardened treatment has stable structure and avoid itself from deformation. Furthermore, the present invention only provides part of air permeable portion on the shoe sole. The material cost can be saved to increase the competitive ability of products in market promotion.

Problems solved by technology

First of all, the hardness of EVA is insufficient to resist the time-dependent creep so that the EVA will be easily deformed and out-of-shape or shorten its lifetime.

Secondly, low air permeability of the EVA may cause beriberi, the user being suffered discomfort after a long time slip-on shoes with EVA sole inside.

But the PU is more expensive than the EVA.

In manufacturing, the material cost is raised due to the finished PU must be processed through hardened treatment.

It results in the loss of competitive ability in the market.

Images