Gas auxiliary injection molding method of car roof handle

A gas-assisted injection molding technology, applied in the field of auto parts, can solve the problems of not being able to give full play to the advantages of gas-assisted molding technology, affecting the appearance and image of injection molded parts, and reducing the strength of plastic products, so as to improve the appearance and image, improve injection molding efficiency, reduce The effect of internal stress in the melt

Active Publication Date: 2019-04-16
NINGBO SHUAITELONG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using these disclosed technologies, there are "air finger" defects of varying degrees in production: air bubbles pass through the thin-walled area outside the air channel of the product to form "finger" branches
Severe "air fingering" will reduce the strength of plastic products, resulting in the failure of gas-assisted molding technology, or the inability to take advantage of gas-assisted molding technology
In addition, if the process parameters of the gas-assisted molding process are not properly controlled, melting marks are likely to occur, which not only affects the appearance and image of injection molded parts, but also affects the mechanical properties to a certain extent

Method used

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  • Gas auxiliary injection molding method of car roof handle
  • Gas auxiliary injection molding method of car roof handle

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The 3 gates and 2 air inlets set in this embodiment are as follows: figure 1 As shown, molten polypropylene is injected into the mold cavity through gate 1, gate 2 and gate 3. The melt temperature is 230°C and the mold temperature is 60°C. After the mold is fully injected, hold the pressure for 2s. Close gate 1 and gate 3, then open air inlet 4 and air inlet 5, nitrogen is injected into the cavity melt through air inlet 4 and air inlet 5, and the nitrogen pressure in air inlet 5 is adjusted to 8MPa , the nitrogen pressure at the inlet 4 is 5MPa, the nitrogen temperature at the two inlets is 0°C, the gas injection time is 3s, the nitrogen pushes the fluid to flow, and the excess fluid flows back to the injection molding system from the gate 2, the plastic in the mold The melt is formed into a hollow state, and the pressure is kept for 6s, and then the mold is cooled in liquid nitrogen at -180°C, the mold is opened, and the product is taken out.

Embodiment 2

[0049] The 3 gates and 2 air inlets set in this embodiment are as follows: figure 1 As shown, the molten polypropylene is injected into the mold cavity through gate 1, gate 2 and gate 3. The melt temperature is 230°C, the mold temperature is 60°C, and the mold is filled with pressure for 6 seconds. Close gate 1 and gate 3, then open air inlet 4 and air inlet 5, nitrogen is injected into the cavity melt through air inlet 4 and air inlet 5, and the nitrogen pressure in air inlet 5 is adjusted to 8MPa , the nitrogen pressure at the inlet 4 is 5MPa, the nitrogen temperature at the two inlets is 0°C, the gas injection time is 3s, the nitrogen pushes the fluid to flow, and the excess fluid flows back to the injection molding system from the gate 2, the plastic in the mold The melt is formed into a hollow state, and the pressure is kept for 6s, and then the mold is cooled in liquid nitrogen at -180°C, the mold is opened, and the product is taken out.

Embodiment 3

[0051] The 3 gates and 2 air inlets set in this embodiment are as follows: figure 1 As shown, molten polypropylene is injected into the mold cavity through gate 1, gate 2 and gate 3. The melt temperature is 230°C and the mold temperature is 60°C. After the mold is fully injected, hold the pressure for 2s. Close gate 1 and gate 3, then open air inlet 4 and air inlet 5, nitrogen is injected into the cavity melt through air inlet 4 and air inlet 5, and the nitrogen pressure in air inlet 5 is adjusted to 8MPa , the nitrogen pressure at the inlet 4 is 5MPa, the nitrogen temperature at the two inlets is 30°C, the gas injection time is 3s, the nitrogen pushes the fluid to flow, and the excess fluid flows back to the injection molding system from the gate 2, the plastic in the mold The melt is formed into a hollow state, and the pressure is kept for 6s, and then the mold is cooled in liquid nitrogen at -180°C, the mold is opened, and the product is taken out.

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Abstract

The invention belongs to the technical field of car parts and particularly relates to a gas auxiliary injection molding method of a car roof handle. The method comprises the following steps that 1, molten plastic is injected into a die cavity through two or more pouring gates, and after injection of a die is full, pressure is maintained; 2, inert gas is injected into the molten plastic in the diecavity through two or more gas inlets, pressure of the injected inert gas is larger than storing pressure of injection molding, a part of the molten plastic in the die cavity returns to the pouring gates, and the hollow state is formed; and 3, the pressure is maintained, cooling is carried out, the die is opened, and a product is taken out.

Description

technical field [0001] The invention belongs to the technical field of auto parts, and in particular relates to a gas-assisted injection molding method for an auto ceiling handle. Background technique [0002] Gas-assisted injection molding (hereinafter referred to as "gas-assisted molding" or GAIM), as a relatively new polymer processing technology, was not widely used industrially until the end of the last century. Compared with conventional injection molding (CIM), gas-assisted molding has the advantages of saving raw materials, shortening molding cycle, reducing clamping force and good dimensional stability of parts. Usually in the gas-assisted molding process, it is necessary to use high-pressure inert gas as the penetrating gas to push and compress the polymer melt until the melt fills the entire mold cavity, and then the melt is gradually cooled and solidified under the pressure of the gas. After the temperature of the part drops to the demoulding temperature, the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/17B29C45/77B29C45/78B60N3/02
CPCB29C45/1704B29C45/77B29C45/78B29C2945/76498B29C2945/76531B29C2945/76561B60N3/02
Inventor 吴志光张芳刚曹晓鹏田建开娄晓华
Owner NINGBO SHUAITELONG GRP CO LTD
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