A microcellular foaming injection molding process with high foaming ratio and no bubble marks on the surface

A technology of microcellular foaming and foaming ratio, which is applied in the field of injection molded parts to achieve the effects of high efficiency, excellent foaming ratio and surface quality, and avoiding the decline of mechanical properties

Active Publication Date: 2018-06-26
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method will also divide the forming process of the product into two parts, and accelerate the foaming agent into the polymer system through screw agitation, but this technology is only applicable to blow-molded hollow container plastic parts

Method used

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  • A microcellular foaming injection molding process with high foaming ratio and no bubble marks on the surface

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] Such as figure 1 As shown, the microcellular foaming injection molding process disclosed in the present invention includes: preparation before injection, preform forming, preform transfer, heating and foaming, and obtaining the final product after cooling. Wherein, the preform and the final product are formed in two mold cavities with different volumes. In this embodiment, two sets of molds are used to form the preform and the final product respectively, but the specific process is as follows, including the following specific steps:

[0031] Step (1), preparation before injection, includes mold opening I and mold closing pressurization II. The microcellular foaming injection molding machine mixes the foaming agent evenly into the polymer melt, and maintains a high-pressure environment to prevent premature foaming. After the preform cavity is cl...

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Abstract

The invention discloses a microcellular foam injection molding process with high foaming magnification and no bubble marks on the surface, including: mixing of polymer melt and foaming agent, preform forming, preform transfer, heating foaming, and obtaining after coolingFinal product.Among them, the preform and the final product are formed in two different volume mold cavities.High cavity pressure, high injection pressure and high holding pressure are used to prevent foaming during preform molding. After the cooled preform is fixed in the forming cavity of the final product, the mold is closed and the mold is heated to foam the interior of the preform.The high-pressure injection process of the preforms can avoid defects such as silver lines, spiral lines, and blisters on the surface of the product, and the volume difference between the preforms and the final product provides space for bubble nucleus growth. The process can be used to produce microcellular foamed injection molded parts with good surface quality and dense internal cells.

Description

technical field [0001] The invention relates to a microcellular foaming injection molding process, which is used for producing injection molded parts with high internal foaming ratio and no bubble marks on the surface. Background technique [0002] Microcellular foamed plastics are defined as cells with a cell size of 1 to 10 μm and a cell density of 10 9 ~10 10 piece / cm 3 , A polymer material with a closed cell structure. The main design idea of ​​the material is: when the size of the cells in the plastic is smaller than the cracks inside the material, the existence of the cells will passivate the original crack tips of the material, which is beneficial to prevent the cracks from expanding under stress, so that the material The mechanical properties are improved. Since the advent of microcellular foam injection molding technology for more than 30 years, although it has received widespread attention in the fields of automobiles, home appliances, aerospace, and biomedicin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C44/34B29C44/60
CPCB29C44/34B29C44/3446B29C44/348B29C44/60
Inventor 赵国群张磊
Owner SHANDONG UNIV
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