CN1680083A - Low-pressure injecting formation of internal decorative board of door - Google Patents

Abstract

A low-pressure injection moulding technology for producing the internal decorative plate of car's door includes such steps as loading the PP modified engineering plastic particles into a full-automatic injection moulding machine, spreading fabric or surface material in a mould, heating said particle to 160-220 deg.C for fusing them, injecting the fused plastics into cavity of mould, solidifying, demoulding, and finishing.

Description

The low pressure injection formaing production method of automobile door internal decoration plate

Technical field

The present invention relates to auto manufacturing, especially relate to the low pressure injection formaing production method of automotive trim panel.

Background technology

China's automobile manufacture industry development is advanced by leaps and bounds, wherein the application of automotive plastic parts is comparatively extensive, show according to relevant authoritative institution statistics: on average each automobile plastic consumption accounts for the 5%-8% of automobile gross weight, current market get on the car other parts it---automobile door internal decoration plate all adopts high-pressure injection molding, this production technology is, plastic pellet is put into injection machine, by concentrating a mould point cast gate to be injected into die cavity plastic melt behind the high temperature, repair blank after the die sinking, at blank surface artificial hacking, make it coarse again, then be coated with layer of adhesive, dried slightly back covered textile or epidermis, the finished product automobile door internal decoration plate is finished.But, along with the raising of people's living material level, require the vehicle variation, the class height, batch fast, environmental protection, obviously, existing manufacturing technique is because process is more, and the production cycle is long; Carry out bondingly with adhesive, smell is heavier, does not conform to environmental requirement.

Summary of the invention

Technical problem at above-mentioned existence the objective of the invention is to: the low pressure injection formaing production method that has proposed the automobile door internal decoration plate of a kind of both compliance with environmental protection requirements, moulding again.Technical solution of the present invention is achieved in that a kind of low pressure injection formaing technology of automobile door internal decoration plate, and its technical process is:

1, PP modified engineered plastic particle is put into the full-automatic computer injection machine;

2, textile or epidermis are put into mould;

3, under screw in injection molding machine heating collar temperature was 160 °-220 ℃ effect, working pressure 25-45MPa was injected into die cavity by a plurality of mould point cast gates in certain hour;

4, open behind the mould fixed number minute, take out blank, the unnecessary plastics of arrangement point cast gate;

5, finished product warehouse-in.

The present invention has following advantages:

1, epidermis and internal layer must not use adhesive, so stop the Workshop Production environmental issue that produces because of the adhesive smell and the new car environmental issue in using;

2, because product comes out from producing end product, all coming out from injection machine to the mould the inside that feeds intake, is one-shot forming fully, has reduced operation, has reduced equipment inputs such as Packing Machine, plastics suction mould, has reduced the labour, has reduced cost.

The specific embodiment

Embodiment one:

To produce wide 0.3 meter, high 0.6 meter automobile door internal decoration plate is example.Its low pressure injection formaing production method is as follows:

1, PP modified engineered plastic particle is put into injection machine for 2.5 kilograms;

2, textile is cut into the same size, puts into mould with this product specification;

3, screw in injection molding machine heating collar temperature is under 160 ℃ the effect, is injected into die cavity by 5 mould point cast gates at 25MPa in 2 minutes;

4, mould is opened after fixing 0.5 minute, takes out blank, the unnecessary plastics of arrangement point cast gate;

5, finished product warehouse-in.

Embodiment two:

To produce 1 wide 0.4 meter, high 0.75 meter automobile door internal decoration plate is example.Its low pressure injection formaing production method is as follows:

1, PP modified engineered plastic particle is put into injection machine for 3 kilograms;

2, epidermis is cut into the same size, puts into mould with this product specification;

3, screw in injection molding machine heating collar temperature is under 220 ℃ the effect, is injected into die cavity by 6 mould point cast gates at 45MPa in 2 minutes;

4, mould is opened after fixing 0.5 minute, takes out blank, the unnecessary plastics of arrangement point cast gate;

5, finished product warehouse-in.

Claims (1)

1. the low pressure injection formaing production method of an automobile door internal decoration plate, its technical process is:

(1), PP modified engineered plastic particle is put into the full-automatic computer injection machine;

(2), textile or epidermis are put into mould;

(3), be that working pressure 25-45MPa is injected into die cavity by a plurality of mould point cast gates under 160 °-220 ℃ the effect in certain hour in screw in injection molding machine heating collar temperature;

(4), open behind the mould fixed number minute, take out blank, the unnecessary plastics of arrangement point cast gate;

(5), finished product warehouse-in.