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A chemical foaming injection molding process with good appearance

An injection molding process and chemical foaming technology, applied to other household appliances, household appliances, household components, etc., to achieve the effect of reduced raw material costs, good appearance quality, and simple and controllable injection foaming process

Active Publication Date: 2019-11-08
CHANGCHUN FAWAY ADIENT AUTOMOTIVE SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a chemical injection molding foaming method, through the rational allocation of raw materials and the process improvement of the foaming process, so as to obtain a chemical foam with good appearance quality, no air marks on the product surface, and lighter weight. Foam injection molding process to solve the shortcomings and deficiencies of existing chemical injection foaming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Raw material allocation

[0021] Take the PP modified material, dry it at 95°C for 4-5 hours, add 0.8% white mineral oil by weight to the PP modified material after the drying treatment, then add 0.5% by weight foaming agent, and mix it mechanically. Stir the feeder and mix thoroughly and evenly;

[0022] 2. Injection molding

[0023] 1. Injection molding: inject the above-mentioned uniformly mixed raw materials into the feeding barrel of the injection molding machine, set the barrel temperature of the injection molding machine to 210 ℃ ~ 240 ℃, cancel the screw ejection during the plasticization process; set the back pressure value to 12 bar, The foaming agent in the melt in the barrel is controlled to be in a pre-foamed state, and the ungrown bubble cores are evenly distributed in the melt in the pre-foamed state; The injection action is completed within 1.5s;

[0024] 2. Foaming molding: After the melt fills the mold cavity, the bubble core releases the pressur...

Embodiment 2

[0028] 1. Raw material allocation

[0029] Take the PP modified material, dry it at 95°C for 4-5 hours, add 0.8% by weight of white mineral oil to the PP modified material after the drying treatment, and then add 0.6% by weight of a foaming agent, and mix it mechanically. Stir the feeder and mix thoroughly and evenly;

[0030] 2. Injection molding

[0031] Same as Example 1, the difference is that the back pressure value is set at 14 bar according to the weight of the product and the addition ratio of the blowing agent.

[0032] Result: There is no impact on the product quality of products with large dermatoglyphics (skin grain size is greater than 1mm²); for small dermatoglyphic products (skin grain size less than 1mm²), there may be air marks on the surface of the product, affecting product quality, and the weight reduction ratio of the product reaches 7%. In JF03-1301-1-2010 light resistance test, the result is qualified.

Embodiment 3

[0034] 1. Raw material allocation

[0035] Take the PP modified material, dry it at 95°C for 4-5 hours, add 0.8% white mineral oil by weight to the PP modified material after drying treatment, then add 0.3% by weight foaming agent, and mix it mechanically. Stir the feeder and mix thoroughly and evenly;

[0036] 2. Injection molding

[0037] Same as Example 1, the difference is that the back pressure value is set at 8 bar according to the weight of the product and the addition ratio of the blowing agent.

[0038] Result: Lightweight chemical foam injection molding parts with no obvious air marks on the appearance and pores inside the product were obtained. This solution is suitable for all skin texture injection molding parts, but the weight reduction ratio of the product is 4%. In JF03-1301-1-2010 light resistance test, the result is qualified.

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PUM

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Abstract

The invention relates to an excellent-appearance chemical foaming injection molding process. The process comprises the following steps: (1) 0.5-1% of white mineral oil and 0.3-0.7% of a foaming agent are added in a PP modified material for full and uniform mixing; and (2) the uniformly-mixed raw materials are injected in an unloading barrel of an injection molding machine; the temperature of a charging barrel of the injection molding machine is set within 210-240 DEG C; the screw rod injection retreating is omitted in the plastifying process; a back pressure value is set according to the product weight and the adding ratio of the foaming agent; the injecting speed and the injecting quantity are increased by using a supercharger, so that the injecting action is finished within 1.5 s; the mold surface temperature is controlled within 35-50 DEG C; and after the product is totally cooled, the product is taken out after mold opening. An injection molding part prepared by the process is excellent in appearance quality, and has no air marks on the surface.

Description

technical field [0001] The invention belongs to the field of plastic chemical foaming, and particularly relates to a chemical foaming injection molding process with good appearance quality of injection molding products. Background technique [0002] Compared with unfoamed materials, the density of foamed plastics can be reduced by 5% to 95%, thereby reducing the consumption and cost of raw materials. Therefore, foamed plastics are widely used in the automotive industry. [0003] At present, the process of microcellular foaming mainly focuses on intermittent autoclave foaming, molding foaming, physical foaming injection molding process and chemical injection molding foaming. Due to the short molding cycle and high production efficiency, the chemical foaming injection molding process can form microcellular foamed products with complex shapes and high dimensional accuracy at one time, and the equipment is simple and easy to operate, and can be directly produced by conventional...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C44/34B29C44/42B29C44/60B29L31/30B29K23/00
CPCB29C44/3446B29C44/42B29C44/60B29K2023/12B29L2031/3005
Inventor 刁鹏鹤唐永亮李洪江杨斌
Owner CHANGCHUN FAWAY ADIENT AUTOMOTIVE SYST CO LTD
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