Processing technology of ETPU damping midsole with compact outer surface

Abstract

The invention discloses a processing technology of an ETPU damping midsole with a compact outer surface. The processing technology comprises the following steps that (1) TPU foaming particles are injected into a foaming particle forming machine mold, water vapor is adopted for heating treatment, and conventional TPU foaming particle formed bodies are obtained after cooling water cooling, water draining, air cooling and demolding; and (2) the TPU foaming particle formed bodies obtained in step (1) are put in a secondary forming mold, the annular side edge portions of the TPU foaming particle formed bodies are quickly heated and cooled to enable the surfaces and interfaces of formed TPU foaming particles to be molten to form a compact layer, and then the ETPU damping midsole with the compactouter surface is obtained. According to the processing technology of the ETPU damping midsole with the compact outer surface, on the basis that the damping property of a shoe is ensured, the gap of every two adjacent TPU foaming particles is minimized so that erosion of dust and grease can be avoided, the soiling resistance of the whole ETPU damping midsole is improved, and the aesthetic feelingof the whole shoe is ensured accordingly.

Description

technical field [0001] The invention relates to the field of ETPU shock-absorbing midsoles, in particular to a processing technology for an ETPU shock-absorbing midsole with a compact appearance. Background technique [0002] Thermoplastic polyurethane (TPU) has many advantages such as high wear resistance, high elasticity, fatigue resistance, and chemical corrosion resistance, so it is widely used in shoe materials. After foaming, thermoplastic polyurethane materials can be prepared into ETPU foam particles, and then people can obtain shaped objects by steam forming. For example, the applicant applied for and obtained a Chinese authorized invention patent on May 9, 2014, and its patent number is 201410196699.3, which clearly discloses the method of using TPU expanded particles to prepare moldings, specifically: inject colored TPU expanded particles into the mold of the expanded particle molding machine, heat treatment with water vapor, cool with cold water, drain, and air-c...

AI Technical Summary

Problems solved by technology

[0004] However, the midsole foamed with ETPU particles, in addition to connecting the upper end surface with the upper and the rubber outsole at the bottom, there will be many exposed areas. These exposed areas are mainly the midsole. Ring side, because these ring sides are always in contact with the outside world, they have been attacked by dust, grease, etc., so the shoes need to be cleaned every time they are worn, but the traditional ETPU foam molding makes the ETPU shock-absorbing midsole. There are still microscopic gaps between adjacent particles, and dust, grease and other substances will diffuse into the above-mentioned gaps and are not easy to clean. Externally, it is easy to accumulate dirt and finally turn black

In addition, since these ring-shaped sides are also used as the appearance surface of the entire shoe, whether it is easy to clean will directly affect the appearance of the entire shoe, and ultimately affect the market performance, and even directly affect the application of ETPU particles in the midsole material of the shoe

Images