Sunye Plastic.The designer of the mold must have extensive experience in design and injection molding. They must consider the relationship between these influencing factors and injection molding conditions, as well as the apparent factors such as injection pressure and mold cavity pressure, filling speed, injection melt temperature and mold temperature, mold structure and nozzle form and distribution, as well as the influence of nozzle cross-sectional area, product wall thickness, the content of reinforcing fillers in the plastic material, the crystallinity and orientation of the plastic material, and changes in the injection molding machine after molding. The influence of these factors also varies depending on the type of plastic material, or other molding conditions such as temperature, humidity, continued crystallization, and changes in the injection molding machine after molding.

Among the various factors influencing precision injection molding, the mold is the key to obtaining precise plastic products that meet quality requirements. The design of the mold and whether the design is reasonable will directly affect the quality of the plastic products. Since the cavity size of the mold is derived from the required size of the plastic product plus the shrinkage rate of the used material, and the shrinkage rate is often a value within a range recommended by the plastic manufacturer or engineering plastic manual, it is not only related to the mold's gate form, gate position and distribution, but also to the crystallization orientation of the engineering plastic, the shape and size of the plastic product, the distance and position of the gate. The main factors affecting plastic shrinkage include thermal shrinkage, phase change shrinkage, orientation shrinkage, compression shrinkage and elastic recovery, and these influencing factors are related to the molding conditions or operation conditions of precision injection molding products.

Since the injection molding process is a process of transforming plastic from solid state to liquid state and then back to solid state. From pellets to melt, and then from melt to product, it goes through the effects of temperature field, flow field and density field. Under the joint action of these fields, different plastics have different polymer structural forms and rheological properties. Any factor that affects the above "fields" will inevitably affect the physical and mechanical properties, size, shape, precision and appearance quality of the plastic products.

Therefore, the intrinsic connection between process factors and the properties of polymers, the structure form of plastics and plastic products will be manifested through the plastic products. Clarifying these intrinsic connections is of great significance for reasonably formulating injection molding processing techniques, reasonably designing and manufacturing molds according to the drawings, and even reasonably selecting injection molding processing equipment. Precision injection molding and ordinary injection molding also have differences in injection pressure and injection rate. Precision injection molding often adopts high pressure or ultra-high pressure injection and high-speed injection to obtain a smaller molding shrinkage rate.

Shenye is an injection mold manufacturer specializing in the manufacturing of various plastic casings, plastic molds, injection molding processing, mold manufacturing, oil spraying and printing, and product development and assembly. Cooperating with Shenye can largely ensure the quality of your products, and the plastic products produced by Shenye are very exquisite and beautiful, loved by a large number of customers. Shenye sincerely looks forward to cooperating with you!