Method for forming hollow plastic products and device therefor

A technology of plastic products and molding methods, which is applied in the field of controllable overflow cavity, can solve the problems of product strength reduction, waste of gas energy, product surface air marks, etc., and achieve the goal of improving product qualification rate, prolonging equipment life, and prolonging mold life Effect
CN1836880AInactive Publication Date: 2006-09-27BEIJING CHN TOP MACHINERY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIJING CHN TOP MACHINERY
Publication Date
2006-09-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to hollow plastic product forming process and device, and is especially gas assisted injection forming process for producing sheet type plastic product with structural rib board and the device, controllable flash chamber. The forming process includes at least: injecting molten plastic into inner cavity of mold, further injecting after filling the inner cavity to pressurize, controlling the piston of the flash chamber to withdraw some interval, introducing pressurizing gas to the molten plastic inside the cavity, pushing the molten plastic with the screw of the plastic injecting machine into the controllable flash chamber, controlling the gas pressure and piston shift to make gas enter to the relatively thick part inside the mold cavity, cooling plastic inside the mold cavity while controlling the piston shift, and making gas flow into inside of the plastic product to speed cooling. The present invention has the advantages of no shrinkage and crack in the thicker part of the product, high production efficiency, etc.
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Description

technical field

[0001] The present invention relates to a method for forming hollow plastic products and related devices, in particular to a method for producing thin-plate plastic products containing structural ribs using gas-assisted injection molding technology and related devices—controllable overflow cavity. technical background

[0002] Ernst Friederich of Rohm GmbH in Germany was the first to invent the gas-assisted injection molding process. The patent No. 2501314 disclosed in German patent literature in 1975 is a molding method for making thermoplastics into hollow products by injection molding. The method disclosed in this patent literature includes injecting sufficient molten material into the prepared above-mentioned In the mold of the hollow product, the pressurized gas is also injected into the molten material through the hole on the nozzle to make the molten material fully contact with the inner surface of the mold. Then, in the above-mentioned mold, the hol...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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