Unlock instant, AI-driven research and patent intelligence for your innovation.

Temperature difference impact resistant anti-cracking PC injection molding process

A technology of anti-cracking and temperature difference, applied in the direction of coating, etc., can solve the problems of cracking, affecting product quality, shortening service life, etc., to achieve the effect of improving fluidity, increasing strength and prolonging service life

Inactive Publication Date: 2021-01-05
孙喜杰
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The annealing treatment method in the existing process can effectively eliminate the cracks caused by the internal stress of PC injection molded parts with relatively uniform wall thickness, but the existing process cannot eliminate the cracks well for PC injection molded parts with uneven wall thickness. Internal stress, cracking will still occur in the environment with large temperature difference, seriously affecting product quality and shortening service life

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Temperature difference impact resistant anti-cracking PC injection molding process
  • Temperature difference impact resistant anti-cracking PC injection molding process
  • Temperature difference impact resistant anti-cracking PC injection molding process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] see figure 1 , a temperature-shock-resistant and crack-resistant PC injection molding process, comprising the following steps:

[0046] S1. Take the PC raw material and dry it under the heating condition of 60°C until the moisture content is lower than 0.3%;

[0047] S2. The barrel temperature of the injection molding machine is set at 230°C, the injection pressure is 50-80MPa, the mold temperature is 120°C, and the holding time is 1 second;

[0048] S3. Put the inverter anti-cracking ball 1 with a volume ratio of 5% into the newly established feeding port of the injection mold, and apply a rotating uniform magnetic field to force the inverter anti-cracking ball 1 to be uniformly distributed;

[0049] S4. Cooling by water cooling to 80°C and then air cooling, the cooling molding time is 40-50s;

[0050] S5. After cooling and forming, automatic demoulding is carried out, and after the product is taken out, edge trimming is carried out to obtain the finished product. ...

Embodiment 2

[0061] see figure 1 , a temperature-shock-resistant and crack-resistant PC injection molding process, comprising the following steps:

[0062] S1. Take the PC raw material and dry it under the heating condition of 70°C until the moisture content is lower than 0.3%;

[0063] S2. The barrel temperature of the injection molding machine is set at 240°C, the injection pressure is 50-80MPa, the mold temperature is 125°C, and the holding time is 2 seconds;

[0064] S3. Put the inverter cracking ball 1 with a volume ratio of 8% into the newly established feeding port of the injection mold, and apply a rotating uniform magnetic field to force the inverter cracking ball 1 to be uniformly stirred in the raw material for a second time. distributed;

[0065] S4. Cool by water cooling to 80°C and then air cooling, and the cooling molding time is 45s;

[0066] S5. After cooling and forming, automatic demoulding is carried out, and after the product is taken out, edge trimming is carried o...

Embodiment 3

[0070] see figure 1 , a temperature-shock-resistant and crack-resistant PC injection molding process, comprising the following steps:

[0071] S1. Take the PC raw material and dry it under the heating condition of 80°C until the moisture content is lower than 0.3%;

[0072] S2. The barrel temperature of the injection molding machine is set at 250°C, the injection pressure is 50-80MPa, the mold temperature is 130°C, and the holding time is 3 seconds;

[0073] S3. Put the inverter cracking ball 1 with a volume ratio of 10% into the newly established feeding port on the injection mold, and apply a rotating uniform magnetic field to force the inverter cracking ball 1 to perform a second stirring in the raw material and then evenly distributed;

[0074] S4. Cool by water cooling to 80°C and then air cooling, and the cooling molding time is 50s;

[0075] S5. After cooling and forming, automatic demoulding is carried out, and after the product is taken out, edge trimming is carrie...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a temperature difference impact resistant anti-cracking PC injection molding process, and belongs to the technical field of injection molding. According to the temperature difference impact resistant anti-cracking PC injection molding process, on the basis of a traditional injection molding process, inversion anti-cracking balls are innovatively introduced and mixed in rawmaterials after injection molding, and the raw materials are subjected to secondary stirring under the action of an external magnetic field, so that the fluidity of the PC raw materials is improved; silicon carbide powder is doped to effectively resist the external temperature difference, so that the shrinkage of the PC raw materials is improved; after cooling forming, the inversion anti-crackingballs are directly reserved in a product, and the external temperature change is accurately sensed by utilizing the heat absorption characteristic of the inversion anti-cracking balls; and then opposite actions are triggered, the inversion anti-cracking balls are integrally shrunk when the product is heated to expand, and the inversion anti-cracking balls are integrally expanded when the product is cooled to shrink, so that the internal stress cracking phenomenon caused by the temperature difference change of the product is effectively counteracted, the strength of the product in different environments is remarkably improved, and the service life of the product is prolonged.

Description

technical field [0001] The invention relates to the technical field of injection molding, and more specifically, relates to a thermal shock-resistant and crack-resistant PC injection molding process. Background technique [0002] With the rapid development of the plastics industry and the automobile industry, the variety and application range of plastics used in automobiles continue to expand for the sake of economy, safety, and environmental protection. Due to the superior performance of plastics, a large number of plastics are used in automobile design, which can not only meet the design performance requirements of automobile structure lightweight, safety, anti-corrosion, shape and comfort, but also help cost and save energy. The application of plastics in automobiles is mainly divided into three categories: exterior parts, interior parts, and functional structural parts. Exterior parts: replace steel with plastic, which can reduce the weight of the car and achieve the pu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/00B29C45/77B29C45/78B29C45/76B29K69/00
CPCB29C45/0001B29C45/76B29C45/77B29C45/78B29C2945/76498B29C2945/76531B29C2945/76561B29K2069/00
Inventor 孙喜杰
Owner 孙喜杰