PET bottle preform mold

Abstract

The invention relates to the technical field of molds, in particular to a PET bottle preform mold. The PET bottle preform mold comprises two identical half molds, each half mold comprises a push plate, an upper mold block, a middle mold block and a lower mold block are sequentially and fixedly arranged on one side of each push plate from top to bottom, the upper mold block, the middle mold block and the lower mold block are all made of stainless steel, inner cavities of the upper mold block, the middle mold block and the lower mold block jointly form a square mold cavity used for PET bottle preform blow molding; and a plurality of second arc-shaped channels are formed in position, along the periphery of the mold cavity, of the middle mold block, the second arc-shaped channels are horizontally arranged and are arranged at intervals in the vertical direction, and the ends of the adjacent second arc-shaped channels communicate with each other through vertically-arranged second channels. Through the arrangement of a wall thickness compensation block, a first channel, a throat pipe and an air passing gap, the cooling speed of the middle of a bottle body can be reduced, cooling of the four corners of the bottle body is accelerated, and the problems that the wall thickness of the bottle body is not uniform and the bottle body is difficult to shape due to the different cooling speeds of the middle of the bottle body and the four corners of the bottle body are solved.

Description

technical field [0001] The invention relates to the technical field of molds, in particular to a PET bottle embryo mold. Background technique [0002] PET bottles and plastic bottles such as beverages and mineral water we usually use come in various shapes and sizes. To produce bottles of different shapes and sizes, molds of different shapes and sizes need to be made according to requirements. Each All kinds of bottles need corresponding matching molds. The design of molds plays an important role in the production of bottles, which will directly affect the quality, quality and cost of bottles. [0003] The blow molding process of PET bottles is a two-way stretching process. After three actions of stretching, primary blowing, and secondary blowing, the time to complete the action is very short, but it must be well coordinated, especially the first two steps determine the material. Therefore, it is particularly important to adjust the temperature of the preform, the timing of...

AI Technical Summary

Problems solved by technology

[0005] In order to make up for the deficiencies of the existing technology, the middle part of the bottle body is in contact with the cavity wall earlier than the four corners of the bottle body in the blow molding process of the existing square PET bottle, which causes it to be cooled prematurely and easily leads to uneven wall thickness. Uniformity, which makes the bottle body difficult to shape, a PET preform mold proposed by the present invention

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