In-mold integrated shoe sole and its manufacturing process

Abstract

The invention relates to a sole, and provides an in-mold integrally formed sole and a manufacturing process thereof. The process can be applicable to the integrally forming manufacturing of EVA (ethylene vinyl-acetate copolymer) mid-soles and rubber sheets with any thicknesses and areas; the bonding by glue water is not needed; the manufacturing work procedures are reduced; the yield and the quality of products can be improved; the production cost is reduced; meanwhile, the environment pollution and the body injury to workers due to the glue water can be avoided. The in-mold integrally formed sole comprises an EVA mid-sole, a hot melt glue film and a vulcanized rubber sheet, wherein the hot melt glue film comprises a PET (polyethylene terephthalate) outer surface layer and an adhesive particle layer attached on the PET outer surface layer; the PET outer surface layer and the adhesive particle layer can be mutually separated; the vulcanized rubber sheet is manufactured by integrally vulcanizing an un-vulcanized rubber sheet and the hot melt glue film in a rubber mold; the vulcanized rubber sheet and the EVA mid-sole are subjected to hot press forming in a mold through the hot melt glue film to form a whole; the hot melt glue film is arranged between the EVA mid-solve and the vulcanized rubber sheet.

Description

technical field [0001] The invention relates to a shoe sole, in particular to an in-mold integrated shoe sole and a manufacturing process thereof. Background technique [0002] Shoes are indispensable daily necessities in people's daily life, and sole is an important part of shoes. The sole in the prior art generally comprises big bottom and midsole, and the big bottom of shoes generally adopts the better rubber material of abrasion resistance, and in order to increase the elasticity and comfort of shoes, the midsole of shoes generally adopts comparatively soft EVA material, Because the materials of the outsole and the midsole are different, the traditional process of making the sole is generally to first foam the EVA midsole and make the rubber outsole at the same time, and then manually glue the midsole and the outsole through glue, In the process of bonding, first remove the burrs on the outsole and midsole, then apply a treatment agent on the bonding surface of the outs...

AI Technical Summary

Problems solved by technology

The midsole and the outsole of the integrally formed shoe sole are integrally formed, so it is no longer necessary to use glue to bond the midsole and the outsole, which reduces the production process, improves the yield and quality of the product, reduces production costs, and avoids the impact of glue on the environment at the same time. Pollution and injury to workers' bodies, strong practicability; however, the one-piece molded sole is only suitable for unvulcanized rubber sheets with a thickness of 0.3-0.6mm, because in order to maintain the stability of EVA molding and the clarity of patterns, unvulcanized rubber sheets and EVA The temperature of the hot pressing molding of the bottom should be controlled at about 180 degrees, and the heat transfer of the unvulcanized rubber sheet with a thickness greater than 0.3-0.6mm is very poor. At a heating temperature of 180 degrees, the unvulcanized rubber sheet cannot be vulcanized completely Complete the shaping effect, therefore, the scope of application of the said one-piece molded sole is limited, it is not suitable for the integrated molding of large area or certain thickness of rubber sheet and EVA midsole, large area or certain thickness of rubber sheet and EVA midsole Only the existing manual gluing operation method can be used between them, the production quality is poor, the production efficiency is low, the labor intensity is high and it is easy to cause environmental pollution

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