Injection molding method for front frame shell of television or display screen

A technology for injection molding and display screens, which is applied to frames, other household appliances, household appliances, etc., can solve problems such as sink marks and warping deformation, severe plastic welding lines, and mechanical performance degradation that are difficult to solve, and achieve excellent appearance quality. No warping deformation, and the effect of improving mechanical properties

Inactive Publication Date: 2010-06-23
TAICANG QIUJING PLASTIC MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when this multi-point glue feeding system is used, there will be relatively serious plastic weld line defects between every two runners, and it is also difficult to solve the probl

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The front frame shell product of a color TV is composed of a panel extending basically vertically and a horizontal bottom plate. When designing the gating system on the mold for it, the only gate is opened on the center line of the back of the panel, and the gate size is 20×1.5 mm. On the parting surface of the mould, an exhaust groove is opened at an interval of 50 mm.

[0015] First, the plastic melt is injected into the mold cavity from the gate, and the melt needs to be filled from the middle and upper part of the shell to the rear end of the bottom plate, and the flow is about 1000 mm. Strictly control the injection amount of the melt to be 95% of the quality of the finished shell, and the size of the gate can ensure that the melt can fill the entire cavity in the shortest time.

[0016] Then inject high-pressure nitrogen into the plastic melt to push the plastic melt to complete the filling process smoothly. There is also a short switching delay time between the...

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Abstract

The invention discloses an injection molding method for a front frame shell of a television or a display screen. In the method, a single gate is adopted to pour, and the method combines the gas-aid injection molding technology to eliminate the defects that multi-point pouring possibly produces plastic welding traces among the flow passages and the like; and the formed product has excellent appearance quality, has no sink mark and buckling deformation, and improves the mechanical property of workpieces. Simultaneously, the method reduces waste loss in the flow passages caused by setting a plurality of gates, reduces the cost, and improves the comprehensive benefit.

Description

technical field [0001] The present invention relates to an injection molding method for producing front frames of television sets or display screens. Background technique [0002] Most of the front frames of TV sets or display screens, especially CRT TVs and display screens, are complex curved shells with many columns and ribs. The front frame shell is usually manufactured by injection molding. In order to make the plastic melt fill the entire mold cavity smoothly, more than three gates are arranged in the commonly used traditional method. However, when this multi-point glue feeding system is used, there will be relatively serious plastic weld line defects between every two runners, and it is also difficult to solve the problems of sink marks and warping deformation generated during the cooling process. The appearance of the final product will be affected, and the mechanical properties will be relatively reduced. Contents of the invention [0003] The object of the prese...

Claims

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Application Information

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IPC IPC(8): B29C45/57B29C45/27B29C45/34B29L12/00
Inventor 陆瑞卿
Owner TAICANG QIUJING PLASTIC MOLD
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