Injection molding process of thin wall plastic products

An injection molding process and a technology of plastic products, which are applied to household components, household appliances, and other household appliances to achieve the effects of reducing internal stress and residual stress, ensuring accuracy and stability, and ensuring quality

Active Publication Date: 2009-05-27
DONGMING XINGYE SCI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose an injection molding process for thin-walled plastic products to solve the problem of molding thin-walled products with a wall thickness below 0.5 mm, preferably 0.15 to 0.5 mm

Method used

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  • Injection molding process of thin wall plastic products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Digital camera battery case, the product is 40.35mm long, 35.40mm wide, the thinnest wall thickness is 0.25mm, and the thinnest wall area is 1400mm 2 , the material is polycarbonate, and its injection molding process is as follows:

[0024] (A) Put the polycarbonate material into the hopper of the injection molding machine, and set the temperature of the barrel: the nozzle is 300°C, the front part is 295°C, the middle part is 290°C, and the rear part is 280°C;

[0025] (B) Mold temperature setting: 60°C;

[0026] (C) Entering the injection stage, the injection pressure is 2700kg / cm 2 , the injection time is 0.1s; the injection speed is 600mm / s, the mold is closed, and the injection starts;

[0027] (D) Switch to the pressure-holding state, using 3 stages of pressure-holding,

[0028] The first stage of holding pressure: pressure 500kg / cm 2 , time 0.05s,

[0029] The second stage of holding pressure: pressure 1300kg / cm 2 , time 0.8s,

[0030] The third ...

Embodiment 2

[0038] Example 2: Mobile phone battery case, the product is a frame structure, length 55.30mm, width 35.40mm, the thinnest wall thickness is 0.20mm, the material is polycarbonate, and its injection molding process is as follows:

[0039] (A) Put the polycarbonate material into the hopper of the injection molding machine, and set the barrel temperature: 305°C for the nozzle, 300°C for the front, 290°C for the middle, and 280°C for the rear;

[0040] (B) Mold temperature setting: 75°C;

[0041] (C) Entering the injection stage, the injection pressure is 2800kg / cm 2 , the injection time is 0.2s; the injection speed is 700mm / s, the mold is closed, and the injection starts;

[0042] (D) Switch to the pressure-holding state, using three-stage pressure-holding,

[0043] The first stage of holding pressure: pressure 800kg / cm 2 , time 0.08s,

[0044]The second stage of holding pressure: pressure 1800kg / cm 2 , time 1s,

[0045] The third holding pressure: pressure 800kg / cm 2 , ti...

Embodiment 3

[0053] Embodiment 3: mobile phone front cover, length 98.10mm, width 49.40mm, thinnest wall thickness 0.40mm, the blend of polycarbonate and acrylonitrile-butadiene-styrene copolymer for material, its injection molding process is as follows:

[0054] (A) Put the blend of polycarbonate and acrylonitrile-butadiene-styrene copolymer into the hopper of the injection molding machine, and set the temperature of the barrel: 270°C for the nozzle, 265°C for the front, 265°C for the middle, and 265°C for the rear Part 255°C;

[0055] (B) Mold temperature setting: 85°C

[0056] (C) Entering the injection stage, the injection pressure is 2000kg / cm 2 , the injection time is 0.6s; the injection speed is 500mm / s, the mold is closed, and the injection starts;

[0057] (D) Switch to the pressure-holding state, using two-stage pressure-holding,

[0058] The first stage of holding pressure: pressure 500kg / cm 2 , time 0.3s,

[0059] The second stage of holding pressure: pressure 1200kg / cm 2...

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Abstract

The invention relates to an injection molding process of thin-wall plastic products, the wall thickness of the formed plastic products is within 0.5mm; the process mainly includes an injection stage, a pressure maintaining stage and a cooling stage, the temperature of fused mass adopts the recommended temperature and does not need to be raised; according to the properties of different plastic raw materials and different mould structures, the temperature of the moulds is adjusted within the range of 20-150 DEG C, according to different molding areas, the injection pressure is controlled within the range of 1500-3000kg / cm<2>, the injection speed is controlled within the range of 400-2000mm / s, the fused mass is injected into the mould and fast switched to the process of pressure maintaining, the pressure maintaining is carried out by adopting 2 or 3 or 4 stages, the pressure and time of each pressure maintaining stage is adjusted, and the molding process is completed after cooling.

Description

[technical field] [0001] The invention relates to an injection molding process for thin-wall plastic products, belonging to the field of thin-wall injection molding. [Background technique] [0002] With the development of the design of products such as notebook computers and mobile phones in the direction of "light, thin, short and small", and the rapid growth of people's demand for these products, thin-wall injection molding technology has developed rapidly. Thin-wall injection molding technology is an emerging technology with a development history of only more than ten years. Its theoretical system has not yet been formed, and systematic research is lacking. Thin-wall injection molding is a relative concept. The wall thickness of traditional plastic products is usually 2-4mm, and the thin-wall design with a wall thickness between 1.2-2mm is called "advanced", and the wall thickness less than 1.2mm can be called "leading". . [0003] The flow channel of thin-walled produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/76B29K69/00B29K55/02B29L31/00
Inventor 王炜王宏烈王玉林
Owner DONGMING XINGYE SCI TECH CO LTD
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