Foaming injection molding system for preparing TPU (Thermoplastic Polyurethane) soles and shoes

Abstract

The invention discloses a foaming injection molding system for preparing TPU (Thermoplastic Polyurethane) soles and shoes. The foaming injection molding system comprises a screw feeder, a gas injection device, a heating device, a heteromorphic intercepting spray nozzle and an electric control cabinet, wherein the screw feeder is used for shearing a TPU rubber raw material in a molten state and conveying the molten TPU rubber into the heating device; the gas injection device is used for injecting a carbon dioxide gas into the molten TPU rubber and uniformly mixing to form a polymer/gas homogeneous phase body; the heteromorphic intercepting spray nozzle is used for directly injecting the quantitative molten TPU rubber into an injection molding mold for sizing. According to the foaming injection molding system disclosed by the invention, a finished product-foamed shoe insole is formed through one-step molding by using a carbon dioxide TPU injection molding and foaming technology, the hardness and the density in any part of the foamed shoe insole can be optionally adjusted, the technological breakthrough which cannot be completed by an ETPU (Engineering Thermoplastic Polyurethane Elastomer) hot press molding for Boost soles can be realized, the wearing comfort of shoes made by the shoe insole can be greatly increased, and the production technology process and the production cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of shoe manufacturing equipment, in particular to a foaming injection molding system for manufacturing thermoplastic polyurethane soles and shoes. Background technique [0002] The midsole of Adidas Boost shoes is produced by processing TPU raw materials into ETPU particles, and then heat-pressed and cold-pressed into the midsole of the shoe. After wearing the shoes, if you experience running, you will find that the heel part is relatively soft and it is very uncomfortable to run. Contents of the invention [0003] In order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide a foaming injection molding system for manufacturing thermoplastic polyurethane soles and shoes. The foamed shoe midsole can be formed at one time, and the foamed shoe midsole can be adjusted at any part. The hardness and density can greatly improve the wearing comfort of shoes made from m...

AI Technical Summary

Problems solved by technology

[0002] The midsole of Adidas Boost shoes is produced by processing TPU raw materials into ETPU particles, and then heat-pressed and cold-pressed into the midsole of the shoe. After using the shoes, after experiencing running, you will find that the heel part is relatively soft and it is very uncomfortable to run.

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