Sole pre-plastic molding process

Abstract

A sole pre-plastic molding process includes the following steps: middle partition unit inner shifting, pre-plastic mold moving, pre-plastic vacuum cover closing, and pre-plastic vacuum extraction, which keeps a gap between an upper mold, a lower mold, and a middle plate of the middle partition unit, maintaining the air tight communicating state between an upper vacuum cover, a lower vacuum cover and the middle partition unit, and making an upper groove space of the upper vacuum cover and a lower groove space of the lower vacuum cover connected to each other and airtight, at this time, the upper vacuum cover and the lower vacuum cover can be locked and vacuumed, such that a first embryo on the lower mold and a second embryo on the middle plate makes the upper mold, the lower mold and the middle plate combined and perform the first sole pre-plastic molding in the vacuum state, so as to avoid quality problems such as burning, bubbles and size deviation in the process of embryo molding.

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