Injection molding technology is a widely used method of producing plastic products. Plastic products factories use injection molding machines to produce a variety of plastic products. One of the mobile phone cases that we love very much in our lives is one of them. However, many injection mold manufacturers with immature technology often produce some sparkling silver stripes when using TPU, PC and other materials to make transparent products, which makes the product aesthetically affected. Therefore, this kind of transparent injection molding Quality parts appear. What is the cause of the problem? How to solve it?

In fact, when injecting transparent products (such as melting point, silver streaks, cracked polystyrene and plexiglass), the quality defects, scratches and cracks of silver are mainly due to the tensile stress in the vertical direction during the injection molding process. Caused by. The weight of polymer molecules is represented by the difference in the direction of heavy flow and the unfolded portion.

The general solutions to such problems are as follows:

(1) Eliminate the interference of gas and other impurities, and fully dry the plastic.

(2) Reduce the material temperature, adjust the barrel temperature in stages, and appropriately increase the mold temperature.

(3) Increase the injection pressure and reduce the injection speed.

(4) Increase or decrease the pre-plastic backpressure and reduce the screw speed.

(5) Improve the exhaust conditions of the runner and cavity.

(6) Clean up possible blockages in nozzles, runners and gates.

(7) Shorten the molding cycle. After demolding, the silver particles can be removed by annealing: hold the polystyrene at 78°C for 15 minutes, or at 50°C for 1 hour, and then heat the polycarbonate to 160°C for a few minutes.

Most of the quality problems that appear in the production process of plastic injection products are caused by process conditions, materials or maintenance of machines and molds. Therefore, in order to produce high-quality, high-precision, high-grade plastic products, it is necessary to control the entire production process, from the detailed information of injection molds, injection molding equipment, the technical experience of operators, the production environment of the workshop, and all aspects of raw materials. high standard.

For details, please contact: Syringe Mould.