A kind of injection blow molding method of teee bellows

Abstract

The invention discloses an injection-blow molding method for a TEEE corrugated pipe, which includes the processes of tube blank forming, tube blank softening, mold clamping, blow molding, detachment and shaping, and can control the weight of the product and the corresponding wall thickness of each part of the product; Add a mandrel on the blow molding line to control the collapse, wrinkle, and shrinkage of the tube blank during the infrared heating process; the corrugated top R angle at the corrugation is R0.45mm; to improve the yield, the heated tube blank passes through the stretch rod The impact can make the bendable head turn to the specified angle, make the wall thickness of the bent product more uniform in the non-corrugated direction, reduce the cost of the mold, and realize the production of large-scale products, which is conducive to reducing the generation of returned materials and waste of remaining materials, effectively Lower production costs.

Description

technical field [0001] The invention relates to the technical field of molding technology, in particular to an injection blow molding method for TEEE bellows. Background technique [0002] The blow molding process is a common method for forming plastic packaging containers. Blow molding is to place the semi-molten tube blank (or parison) obtained by extrusion or injection molding into the mold, then close the mold, and pass it into the tube blank. Compressed air stretches and expands it to make it cling to the wall of the cavity, and then cools and demoulds to obtain a hollow product of a certain shape. [0003] Pipe products are usually obtained by extrusion blow molding, while some daily necessities such as medicine bottles, beverage bottles, oil pots, and lampshades are mainly obtained by injection blow molding. Compared with extrusion blow molding, injection blow molding Molding has the advantages of short molding cycle, high dimensional control accuracy, relatively uni...

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Problems solved by technology

[0003] Pipe products are usually obtained by extrusion blow molding, while some daily necessities such as medicine bottles, beverage bottles, oil pots, and lampshades are mainly obtained by injection blow molding. Compared with extrusion blow molding, injection blow molding Molding has the advantages of short molding cycle, high dimensional control accuracy, relatively uniform wall thickness, and less material head. However, in the existing technology, the production of TEEE bellows by injection blow molding process is still impossible, because when TEEE is forming bellows, It is necessary to heat the tube blank at a temperature close to 200°C. At this time, the tube blank will collapse and wrinkle. In addition, during the TEEE infrared heating process, the product will shrink, resulting in incorrect control points of the wall thickness, and the tube blank wrinkled during the heating process. And shrinkage will cause the ripples to break during subsequent blow molding, and the blowing ratio of the corrugations is large. If the wall thickness of the tube blank at the forming corrugations is uneven, the corrugations of the product will break during blow molding, resulting in the corrugations not forming and the product not forming

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