Blowing assisted demoulding system for pp and pet bottle preforms

Abstract

The invention relates to an air-blowing auxiliary demoulding system of PP and PET bottle blanks. The system comprises an injection chamber (2), a mould lip (3), an injection core (5), an injection core sleeve (4), a sliding plate (7) and a pushing plate (9); the injection chamber (2) is fixedly disposed in a chamber-fixing plate (6); one side of the mould lip (3) is cooperated with one side of the injection chamber (2), and the other side of the mould lip (3) is cooperated with the injection core sleeve (4); the injection core (5) is cooperatively disposed in the injection core sleeve (4); the outer wall of the injection core sleeve (4) is successively provided with the sliding plate (7) and the pushing plate (9), and an air-blowing insert (8) is inlaid between the sliding plate (7) and the pushing plate (9); the pushing plate (9) is provided with a plurality of air-blowing holes (11) and transverse air-blowing channels (13); and the air-blowing insert (8) is provided with a plurality of oblique air-blowing channels (12). The air-blowing auxiliary demoulding system of the invention has the advantages of less modification on the original structure, excellent auxiliary capability of demoulding from the bottle blanks, and high finished product rate.

Description

technical field [0001] The invention relates to an air blowing auxiliary demoulding mechanism of a preform injection mold, in particular to an air blowing auxiliary demoulding system for PP and PET bottle preforms. Background technique [0002] The demoulding of the PP large infusion bottle preform mold mainly relies on the lip module to drive the reinforcing ring of the preform to move outward together when the mold is opened and ejected. During this process, when the tightness between the product and the core is too large, the product sometimes cannot completely fall off the core, causing the product and mold parts to be crushed when the mold is closed again, resulting in loss and interruption of production. [0003] In order to ensure the smooth completion of the preform during demoulding, someone proposed a practical mold thread demoulding mechanism. The working process is plastic injection, cooling, mold opening, thread core automatically rotates and withdraws from the ...

AI Technical Summary

Problems solved by technology

In this process, when the tightness between the product and the core is too large, the product sometimes cannot completely fall from the core, causing the product and mold parts to be crushed when the mold is closed again, resulting in loss and interruption of production

[0003] In order to ensure the smooth completion of the preform during demoulding, someone proposed a practical mold thread demoulding mechanism. The working process is plastic injection, cooling, mold opening, thread core automatically rotates and withdraws from the workpiece, and the ejection mechanism ejects the workpiece. There is a gap in the transmission mechanism, and it often occurs that the movement of the thread core is not in place or overtravel. If the movement of the thread core is not in place, the forming length of the workpiece thread will be short, which does not meet the product quality requirements. It is best to fix the movement distance of the thread core during production. , but it is difficult to achieve

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