A laminated mold and process method for microcellular foaming injection molding

A technology of microcellular foaming and laminated molds, which is applied in the field of appearance injection molding parts to achieve the effects of avoiding the decline of mechanical properties, high production efficiency, and preventing dynamic foaming

Active Publication Date: 2018-03-06
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This technology will also divide the molding process of the product into two parts, and accelerate the foaming agent into the polymer system through screw agitation, which is only suitable for blow molding hollow container plastic parts

Method used

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  • A laminated mold and process method for microcellular foaming injection molding
  • A laminated mold and process method for microcellular foaming injection molding

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0041] The invention provides a laminated mold structure and process method for microcellular foaming injection molding. Through the two cavities of the laminated mold, the preform containing the foaming agent and the final product containing the dense cell structure are molded respectively. Among them, the high-pressure injection process is used in the preform preparation process to prevent the preform from foaming; the preform cannot contact the mold wall surface of the outer surface of the molded product in the final product molding cavity. Wherein the volume of the preform molding cavity A can be controlled in the range of 40-99% of the volume of the final product molding cavity B, the specific structure is as follows figure 1 As shown, the laminated mold used for microcellular foaming process includes: movable mold seat plate 1, movable mold side ...

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Abstract

The invention discloses a laminated mold and a process method for microcellular foaming injection molding. The laminated mold includes at least two cavities with different volumes, the smaller one is the preform molding cavity, and the larger one is the final product molding cavity; the template participating in the preform molding is provided with gas for controlling the cavity pressure In and out of the pipeline, heating / cooling components for controlling the temperature of the mold are set in the template that participates in the molding cavity of the final product. In the present invention, a preform containing a foaming agent but without a cell structure is first molded, and then the preform is transferred into a molding cavity of a final product, and the preform is foamed and expanded by heating the mold until the entire cavity is filled. The laminated mold and its technology involved in the invention can obtain plastic parts with no bubble marks on the surface, dense inner bubbles and high expansion ratio without prolonging the injection molding production cycle.

Description

technical field [0001] The invention relates to a laminated mold structure and a process method for microcellular foaming injection molding, in particular to a process technology for producing appearance injection molded parts with high surface quality and dense internal cells by using a laminated mold. Background technique [0002] Appearance parts have always been products that are difficult to produce by microcellular foam injection molding. It is necessary to ensure high-quality appearance quality, but also requires uniform distribution of dense cell structure inside the product, which is a technical requirement that is difficult to achieve by traditional microcellular foaming injection molding technology. At present, the appearance quality of high-quality plastic parts can be achieved through back pressure, rapid thermal cycle, and cavity surface coating technology, but the combination of these technologies and microcellular foaming technology has brought adverse effect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C44/34B29C44/58
CPCB29C44/34B29C44/3415B29C44/3449B29C44/367B29C44/42B29C45/32
Inventor 赵国群张磊
Owner SHANDONG UNIV
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