Analysis on the selection skills of plastics with different properties in plastic mold processing 123
Injection molding manufacturers use different methods when selecting plastics with different properties. By understanding the material properties of raw materials in detail, we can provide customers with better product material selection scheme. In this regard, the product designers of injection molding manufacturers will share the selection skills of thermosensitive plastics and hydrolyzable plastics, as well as the improvement schemes for different hygroscopicity of plastics. The following will introduce these contents in detail, hoping to provide reference for you.
1. Heat sensitive plastics and hydrolyzable plastics are one of the important properties that we need to pay attention to. Thermosensitive plastics refer to plastics that are sensitive to heat at high temperatures and are prone to discoloration, degradation and decomposition. Some common thermosensitive plastics include rigid PVC, polyvinylidene chloride, vinyl acetate copolymer, POM and polytrichloroethylene trifluoride. During the decomposition of these plastics, monomer, gas, solid and other by-products will be produced, some of which have corrosive effect or toxicity on human body, equipment and mold. Therefore, special attention should be paid to the design of mold, the selection of injection molding machine and the molding process. Screw injection molding machine should be selected. The section of gating system should be large. The mold and barrel should be chrome plated to avoid dead corner stagnation, and the molding temperature should be strictly controlled. In addition, adding stabilizer to plastics can weaken its thermal sensitivity, thereby improving product quality and safety.
2. Easy hydrolysis is another important property that needs attention. Some plastics, such as PC, will also decompose under high temperature and high pressure when they contain a small amount of moisture. This hydrolytic property requires pre heating and drying to ensure the quality and stability of the product.
3. The hygroscopicity of plastics also needs attention. Due to the existence of various additives, plastics have different degrees of affinity to water, so plastics can be roughly divided into two types: hygroscopic, adhesive and non hygroscopic. If the water content in the plastic exceeds the range allowed by the injection molding manufacturer, the water will turn into gas or cause hydrolysis under high temperature and high pressure, which will make the resin foaming and reduce the fluidity, affecting the appearance and mechanical properties. Therefore, for hygroscopic plastics, it is necessary to preheat them with appropriate heating methods, and avoid re hygroscopicity during use, so as to ensure product quality and stability.
The selection skills of plastics with different properties. For the selection of plastics with different properties, injection molding manufacturers need to take corresponding methods and measures according to the characteristics of plastics to ensure that the quality and performance of products meet the needs and expectations of customers. I hope that these skills and improvement programs can provide useful reference and guidance for you.