Gas auxiliary injection molding process for household electrical appliance casing

An injection molding process, gas-assisted technology, applied in the direction of household components, household appliances, other household appliances, etc., can solve the problems of many ribs and columns, complex shapes, deformation, etc., to achieve no warping deformation, no sink marks , The effect of reducing injection pressure and clamping force

Inactive Publication Date: 2007-11-28
TAICANG QIUJING PLASTIC MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high requirements on the appearance of the shell of the home appliance, the shape is very complex, and there are many ribs and columns. When the conventional injection molding technology is used for production, serious shrinkage will occur in the area of ​​the ribs and columns due to the uneven wall thickness. If the plane is large, warping and deformation will also occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The gas-assisted injection molding process of the home appliance casing of the present invention will be described below by taking the casing of a color TV as an example. Color TV shell products are usually complex curved shells with many ribs and columns. When setting up gas passages, one air passage is provided at the left and right ends of the intersection area of ​​the front and side walls of the color TV casing. The cross section is circular, and its diameter is 1.2 times the wall thickness of the outer casing.

[0019] In the molding process of the color TV casing, the plastic melt first enters the mold cavity through the preset two point gates, and fills the cavity of the mold according to the traditional injection molding mode. Since the gas will be injected later, it is necessary to pre- Calculate the amount of material injected into the plastic melt in order to leave the volume of space occupied by the gas. After injecting 96% of the plastic melt of the mass...

Embodiment 2

[0023] In the gas injection molding process of the color TV casing in Example 2, the air intake method in stage (2) is nozzle air intake, that is, a special self-sealing gas-assisted nozzle is used. After the plastic is injected into the mold cavity, the high-pressure gas relies on The nozzle directly enters the inside of the plastic, forms an extended closed space according to the air channel, that is, the air cavity, and maintains a certain pressure until it cools down. Before the mold is opened, the nozzle is forcibly separated from the product material channel by the back of the seat, so that the gas is discharged from the product. Due to the nozzle air intake method, the diameter of the glue inlet is about 4 mm, which is conducive to the entry of high-pressure nitrogen. Stages (1) and (3) in this embodiment are the same as those in Embodiment 1.

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PUM

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Abstract

The present invention relates to one kind of improved gas aided injection molding process for producing casing for electric appliance. The process includes the first injecting plastic melt in the amount of 95-97 % of the casing weight into the mold cavity and the subsequent injecting high pressure nitrogen through the preset gas channel, which is set in the place near the interjunction between the front side and the lateral side of the casing. Compared with available technology, the present invention has the advantages of raised casing forming efficiency, lowered cost and good appearance of the product.

Description

technical field [0001] The invention relates to a gas-assisted injection molding process, in particular to a gas-assisted injection molding process for an outer casing of a household appliance, and belongs to the technical field of injection molding. Background technique [0002] The usual injection molding process of home appliance casing is to inject molten plastic into the mold cavity, form the required home appliance casing parts after cooling, and open the mold to take out the parts after reaching the ejection temperature. Due to the high requirements on the appearance of the shell of the home appliance, the shape is very complex, and there are many ribs and columns. When the conventional injection molding technology is used for production, serious shrinkage will occur in the area of ​​the ribs and columns due to the uneven wall thickness. If the plane is large, warping and deformation will also occur. [0003] In the second half of the 20th c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/57B29C45/76B29L31/00
Inventor 陆瑞卿
Owner TAICANG QIUJING PLASTIC MOLD
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