Chemical foaming prepressing high speed injection molding method

An injection molding and chemical foaming technology, which is applied in the field of chemical foaming pre-compression injection molding of thick-walled plastic foam parts, can solve the problems of high requirements for auxiliary machine parts and high equipment requirements, so as to reduce the consumption of raw materials and the production of products. Reliable performance and cost reduction

Inactive Publication Date: 2007-08-08
DONGHUA MACHINERY
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Problems solved by technology

[0004] Aiming at the problems that the existing foaming injection molding technology has high requirements for auxiliary machine parts, the technical problem to be solved by the present invention is to overcome the above-mentioned shortcomings of physical and chemical foaming methods that require high equipment, and provide a simple and practical comprehensive utilization injection molding machine System resources such as equipment, molds, plastic raw materials, etc., a method for high-speed and efficient production of thick-walled plastic foam parts

Method used

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  • Chemical foaming prepressing high speed injection molding method
  • Chemical foaming prepressing high speed injection molding method
  • Chemical foaming prepressing high speed injection molding method

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Embodiment Construction

[0031] In order to further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] The related equipment structure of the present invention mainly includes the following parts (or devices): movable mold 1, fixed mold 2, sealing device 3, nozzle 4, mixer 5, barrel 6, plasticizing screw 7, hopper 8, barrel Support base 9, screw drive device 10, moving guide rod 11, plastic parts 12.

[0033] In the chemical foaming pre-compression high-speed injection molding method of the present invention, when the mold is clamped, the 4 holes of the nozzle are sealed to prevent the molten material from flowing into the mold cavity; The material is compressed under the push of the plasticizing screw 6, and the melt pressure increases to 1500-2000kg / cm2; then the automatic sealing nozzle 3 is o...

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Abstract

The invention relates to a pre compression chemical foaming high speed injection mold forming. It synthetically uses the resources like injection molding equipment, molds, plastic materials and so on. It starts with the tight closing of the mold, injecting the precompressed melt material into the mold cavity, filling the cavity through inside foaming with the melt material closely attached to the metal wall of the cavity, solidification of the material after cooling, opening the male mold and the female mold to get the smooth, tight, and evenly allocated plastic parts. It can eliminate or reduce the shrink dent or warpage of the part, reducing injection pressure and the mold locking pressure, with low running cost, improved product dimension precision and strength, effectively reducing material consumption by 15%-35%, with higher mechanical feature and weight proportion.

Description

technical field [0001] The invention relates to a chemical foaming injection molding process method for foamed plastic parts, in particular to a chemical foaming pre-pressing method for thick-walled plastic foamed parts used in industries such as auto parts, sports equipment, home appliances and toys Injection molding method. Background technique [0002] Affected by factors such as oil prices and material energy shortages, global plastic raw material prices are on the rise, and plastic application technologies that save raw materials and improve efficiency have developed rapidly. In terms of injection molding, foam molding, gas-assisted injection molding and water-assisted injection molding and other application technologies and equipment development are important components of the development of the plastics industry and processing technology in recent years. Foam injection molding technology is one of the most popular technologies in the industry. The most interesting th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/00B29C45/46B29C45/77B29C45/76B29C45/18B29C45/17B29K105/00B29L31/60
Inventor 陈志雄叶智方李向东谢雄飞
Owner DONGHUA MACHINERY
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