CN103192509A - Injection molding process of PC (poly carbonate) plastic car lamp shade - Google Patents

Abstract

The invention relates to an injection molding process of a PC (poly carbonate) plastic car lamp shade. The injection molding process comprises the following steps of: (1) raw material drying; (2) pretreatment by using an injection molding system and an injection mold; (3) plasticizing; (4) injection; (5) pressure maintaining; (6) cooling forming; and (7) demolding. According to the invention, the forming cycle and production cost of a car lamp liner frame are reduced, and the quality of a finished product is effectively improved. The prepared car lamp shade is simple in producibility, has high impact resistance, high strength, excellent chemical resistance, good dimensional stability and good surface smoothness.

Description

A kind of PC plastics car light lampshade Shooting Technique

Technical field

The present invention relates to a kind of PC plastics car light lampshade Shooting Technique of injection mo(u)lding.

Background technology

The injection molding process process of known plastic mainly comprises filling---pressurize---cooling---4 stages such as the demoulding, this 4 stages are directly determining the Forming Quality of goods, yet also there is certain defective in existing Shooting Technique in implementation process, such as the processing step complexity, cycle is long and cost is high, the quality that these all can influence finished product is difficult to meet people's making requirement.

Summary of the invention

At above deficiency, the object of the present invention is to provide a kind of PC plastics car light lampshade Shooting Technique, reduce car light lining frame molding cycle and production cost with simple implementation step, effectively improve end product quality.

Technical scheme of the present invention realizes in the following manner: a kind of PC plastics car light lampshade Shooting Technique may further comprise the steps: 1) raw material drying is handled; 2) adapted to injection system and injection mold preliminary treatment; 3) plasticizing; 4) injection; 5) pressurize; 6) cooling forming; 7) demoulding; It is characterized in that:

1), raw material drying is handled: utilize baking oven that the PC plastics are carried out 4 hours drying, and be heated to 120 ± 5 ℃;

2), adapted to injection system and injection mold preliminary treatment: with adapted to injection system and injection mold preheating, one section 275 ± 10 ℃, two sections 300 ± 10 ℃, three sections 305 ± 10 ℃, four sections 295 ± 10 ℃, five sections 265 ± 10 ℃, six sections 250 ± 10 ℃, runner is heated to 310 ± 10 ℃;

3), plasticizing: the PC plastics that preliminary treatment in the step 1 is good add in the adapted to injection system of handling well in the step 2, are heated to molten condition simultaneously;

4), injection: the phase I injection pressure is that 100 ± 10bar, second stage injection pressure are that 110 ± 10bar, phase III injection pressure are that 110 ± 10bar, quadravalence section injection pressure are 60 ± 10bar;

5), pressurize: dwell pressure is 60 ± 10bar, and the time is 10s;

6), cooling forming: the cooling forming time is 35s;

7), the demoulding: the demoulding while hot.

The present invention has reduced car light lining frame molding cycle and production cost, effectively raises the quality of finished product.Have easy manufacturability, high impact resistance, high strength, good chemical resistance, dimensional stability is good, and product surface fineness is good.

The specific embodiment

A kind of PC plastics car light lampshade Shooting Technique may further comprise the steps:

1, raw material drying is handled: utilize baking oven that the PBT plastics are carried out 3 hours drying, and be heated to 120 ± 5 ℃;

2, adapted to injection system and injection mold preliminary treatment: with adapted to injection system and injection mold preheating, one section 240 ± 10 ℃, two sections 235 ± 10 ℃, three sections 230 ± 10 ℃, four sections 230 ± 10 ℃, five sections 220 ± 10 ℃;

3, plasticizing: the PC plastics that preliminary treatment in the step 1 is good add in the adapted to injection system of step 2, are heated to molten condition simultaneously;

4, injection: the phase I injection pressure is 80 ± 10 bar, time 10s; The second stage injection pressure is 45 ± 10 bar;

5, pressurize: dwell pressure is 40 ± 10 bar, and the time is 10s;

6, cooling forming: the cooling forming time is 35s;

7, the demoulding: the demoulding while hot.

Claims (1)

1. a PC plastics car light lampshade Shooting Technique may further comprise the steps: 1) raw material drying processing; 2) adapted to injection system and injection mold preliminary treatment; 3) plasticizing; 4) injection; 5) pressurize; 6) cooling forming; 7) demoulding; It is characterized in that:

1), raw material drying is handled: utilize baking oven that the PC plastics are carried out 4 hours drying, and be heated to 120 ± 5 ℃;

2), adapted to injection system and injection mold preliminary treatment: with adapted to injection system and injection mold preheating, one section 275 ± 10 ℃, two sections 300 ± 10 ℃, three sections 305 ± 10 ℃, four sections 295 ± 10 ℃, five sections 265 ± 10 ℃, six sections 250 ± 10 ℃, runner is heated to 310 ± 10 ℃;

3), plasticizing: the PC plastics that preliminary treatment in the step 1 is good add in the adapted to injection system of handling well in the step 2, are heated to molten condition simultaneously;

4), injection: the phase I injection pressure is that 100 ± 10bar, second stage injection pressure are that 110 ± 10bar, phase III injection pressure are that 110 ± 10bar, quadravalence section injection pressure are 60 ± 10bar;

5), pressurize: dwell pressure is 60 ± 10bar, and the time is 10s;

6), cooling forming: the cooling forming time is 35s;

7), the demoulding: the demoulding while hot.