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Water-assisted (co-injection) injection mold for complex-formed tube and stick plastic parts

An injection mold, water-assisted technology, applied in the field of injection molds, can solve the problems of no measures for preventing backflow of runners, and achieve the effects of stable water injection and production cost savings.

Inactive Publication Date: 2013-11-27
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing water-assisted mold does not propose specific measures to prevent the backflow of the flow channel during water injection, nor does it propose corresponding conversion measures for the overflow method and the short shot method

Method used

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  • Water-assisted (co-injection) injection mold for complex-formed tube and stick plastic parts
  • Water-assisted (co-injection) injection mold for complex-formed tube and stick plastic parts
  • Water-assisted (co-injection) injection mold for complex-formed tube and stick plastic parts

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Experimental program
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Embodiment Construction

[0017] The present invention will be further described below in conjunction with accompanying drawing:

[0018] Such as figure 1 As shown, a water-assisted (co)injection mold includes a movable mold body (1), a fixed mold body (2), a movable mold gate insert (3), a fixed mold gate insert (4), a runner seal Needle (5), sprue sleeve (6), movable mold cavity insert (7), fixed mold cavity insert (8), fixed mold overflow cavity insert (9), overflow channel sealing pin (10), The overflow chamber insert (11) and the water needle (12) of the movable mold. The installation position of the water needle (12) is selected near the ground side of the moving mold parting surface to avoid mold damage caused by water leakage, and the water injection port is aligned with the gate, that is, the axial direction of the pipe fitting, so as to avoid water flow from the side of the cavity. The sharp steering leads to the problem of eccentric penetration of the front section and instability of the ...

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Abstract

The invention discloses a water-assisted (co-injection) injection mold for complex-formed tube and stick plastic parts. The water-assisted (co-injection) injection mold comprises movable / fixed mold bodies, movable / fixed mold gate inserts, a gate bush, movable / fixed mold cavity inserts, movable / fixed mold material-overflowing cavity inserts, a runner sealing needle, an overflow runner sealing needle and a water needle. After mold assembly, one or two kinds of moderate plastic melts are sequentially injected into a mold cavity, and the runner sealing needle is closed to prevent backflow. After delaying, the water needle is opened, and high-pressure water is injected into the inner parts of the melts to push the melts of a core part to flow forwards to complete filling. After pressure maintaining, the water needle is closed. After cooling, a mold is disassembled, and a high-quality hollow single-layer / multiple-layer tube and stick workpiece is obtained. In the injection process, the transformation between full-material injection and material-shortage injection can be realized through the opening and closing of the overflow runner sealing needle. The water-assisted (co-injection) injection mold has the characteristics of easiness in replacement and adjustment of insert structures, varied application processes, stable forming process, high forming quality and the like and is suitable for experimental research and production of water-assisted injection and water-assisted co-injection processes and even an air-assisted injection process.

Description

technical field [0001] The invention relates to an injection mold using a water-assisted injection molding process or a water-assisted co-injection molding process, which is mainly used for injection molding to produce complex pipe fittings or hollow rods. Background technique [0002] Straight pipes with constant cross-section can be produced by extrusion molding, and straight pipes with equal cross-sections with multi-layer cladding structure can be obtained by multi-layer co-extrusion molding method. Simple pipe joints can be produced by injection molding. For complex pipe fittings with turning or variable cross-section features, complex pipe fittings or hollow parts with multi-layer coating structure, conventional extrusion or injection molding cannot be used to produce them, and water-assisted injection molding process or water-assisted co-injection molding process is required. [0003] In water-assisted (co-) injection molding (hereinafter referred to as "water-assist...

Claims

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Application Information

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IPC IPC(8): B29C45/26
Inventor 匡唐清付伟余春丛
Owner EAST CHINA JIAOTONG UNIVERSITY
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