Steam-assisted specular no-mark injection molding process for front shell of large-size LED TV

An injection molding process, a high-gloss non-marking technology, applied in the direction of coating, etc., can solve the problems of internal stress, slow flow of plastic melt, sink marks, etc., and achieve the effect of eliminating internal stress, reducing process cost and reducing pollution

Inactive Publication Date: 2017-02-15
滁州市荣康塑料制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is aimed at the deficiencies of the existing technology, and provides a large-size LED TV front shell-assisted steam high-gloss seamless injection molding process, which adopts a hot runner and a cold runner multi-point feed latent gate design to solve the problem. The slow flow of the far end of the plastic melt is prone to sink marks and the existence of internal stress. At the same time, the travel time of the corresponding hot runner and cold runner is increased in the key parts of the product, thereby greatly improving the appearance quality and molding pass rate of the product. etc., to meet the actual use requirements

Method used

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  • Steam-assisted specular no-mark injection molding process for front shell of large-size LED TV
  • Steam-assisted specular no-mark injection molding process for front shell of large-size LED TV

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specific Embodiment 1

[0025] like Figure 1-2 As shown, it is the large-size LED TV front case-assisted steam high-gloss seamless injection molding process described in this embodiment, which specifically includes the following steps:

[0026] Step (1), mold design: According to the shape and structure required by the front shell of the LED TV, the hot runner and cold runner multi-point feed latent gate design is adopted. The mold includes optimized irregular water channels, mold cavities and airway;

[0027] Step (2), material selection: use PMMA or PC / ABS or high-gloss ABS material as the injection material;

[0028] Step (3), drying: Place the injection molding material in the drying box of the injection molding machine and dry it at 60°C for 4.5 hours to make the humidity less than 0.04%, and then use the automatic feeding system to continuously feed the material;

[0029] Step (4), mold preheating: correctly install the mold on the injection molding machine, preheat the mold before closing t...

specific Embodiment 2

[0040] like Figure 1-2 As shown, it is the large-size LED TV front case-assisted steam high-gloss seamless injection molding process described in this embodiment, which specifically includes the following steps:

[0041] Step (1), mold design: According to the shape and structure required by the front shell of the LED TV, the hot runner and cold runner multi-point feed latent gate design is adopted. The mold includes optimized irregular water channels, mold cavities and airway;

[0042] Step (2), material selection: use PMMA or PC / ABS or high-gloss ABS material as the injection material;

[0043] Step (3), drying: Place the injection molding material in the drying box of the injection molding machine and dry it at 70°C for 5 hours to make the humidity less than 0.04%, and then use the automatic feeding system to continuously feed the material;

[0044] Step (4), mold preheating: correctly install the mold on the injection molding machine, preheat the mold before closing the...

specific Embodiment 3

[0055] like Figure 1-2 As shown, it is the large-size LED TV front case-assisted steam high-gloss seamless injection molding process described in this embodiment, which specifically includes the following steps:

[0056] Step (1), mold design: According to the shape and structure required by the front shell of the LED TV, the hot runner and cold runner multi-point feed latent gate design is adopted. The mold includes optimized irregular water channels, mold cavities and airway;

[0057] Step (2), material selection: use PMMA or PC / ABS or high-gloss ABS material as the injection material;

[0058] Step (3), drying: Place the injection molding material in the drying box of the injection molding machine and dry it at 80°C for 5.5 hours to make the humidity less than 0.04%, and then use the automatic feeding system to continuously feed the material;

[0059] Step (4), mold preheating: correctly install the mold on the injection molding machine, preheat the mold before closing t...

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Abstract

The present invention discloses a steam-assisted specular no-mark injection molding process for a front shell of a large-size LED TV. The process comprises the following steps: step (1), mold design; step (2), choice of a material; step (3), drying; step (4), mold preheating: correctly mounting the mold on an injection molding machine, preheating the mold before production mold clamping at a set preheating temperature within a range of 80-90 DEG C; step (5), mold clamping and rapid heating; step (6), speed-regulating and pressure regulating staged injection; step (7), rapid cooling; and step (8), mold opening for taking out the molded part. According to the present invention, by using the design of a multiple-feed subsurface gate with a hot runner and a cold runner, the problems of easy formation of sink marks and existing of internal stress due to slow remote flow of plastic melt, and the like are solved; meanwhile, corresponding travel time for the hot runner and the cold runner is added to the key portion of the product, thereby greatly improving the appearance quality of the product and increasing the molding yield, etc.; and the requirements of actual use are met.

Description

technical field [0001] The invention relates to an auxiliary steam high-gloss traceless injection molding process for a front shell of a large-size LED TV, and belongs to the technical field of the auxiliary steam high-gloss traceless injection molding process. Background technique [0002] With the continuous development of science and technology and the continuous improvement of people's material living standards, the functional requirements and appearance requirements of TV sets are getting higher and higher, such as the surface finish and precision of TV casings. In order to improve the surface quality of injection molded products, a spraying process is usually used in the existing technology. Spraying is the most basic, broadest and most effective method used in surface protection. Spraying can ensure that the surface of the TV casing has anti-corrosion function and bright appearance. The quality of spraying is directly related to the competitiveness of products and ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/00B29C45/27
CPCB29C45/0025B29C45/2708
Inventor 陈结林陈江林
Owner 滁州市荣康塑料制品有限公司
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