Mold designers must have rich experience in design and injection moulding, and must consider the relationship between these factors, injection conditions and their obvious factors, such as injection pressure and cavity pressure and filling speed, melt temperature and mould temperature, injection moulding structure and gate form and distribution of products, as well as door area, wall thickness, plastic materials. The content of reinforcing filler in plastic materials is affected by crystallinity and orientation. The influence of the above factors also varies with the plastic material, or other forming conditions such as temperature, humidity, crystallization duration, and the change of injection moulding machine after moulding.
Among the factors affecting precision injection moulding, mould is the key to obtain precision plastic products that meet the quality requirements. Whether the die design is reasonable or not will directly affect the quality of plastic products. Because die cavity size is the size and material shrinkage required by plastic products, and the shrinkage rate of engineering plastics is often recommended by manually manually plastic manufacturers, it is not only with the form of die gate, gate location and distribution, but also with the crystal orientation of engineering plastics and the shape, size and distance of plastic products. The main factors affecting plastic shrinkage are heat shrinkage, phase change shrinkage, directional shrinkage, compression shrinkage and elastic recovery.
Injection is the process of plastics from solid to liquid and then to solid. From grain to melt, and from melt to product, temperature field, flow field and density field are needed. Under the action of these fields, different plastics have different polymer structures and rheological properties. All the factors affecting the above "field" will certainly affect the physical and mechanical properties, size, shape, accuracy and appearance quality of plastic products.
Thus, the intrinsic relationship between technological factors and polymer properties, structural forms and plastic products can be expressed by plastics products. It is of great significance to analyze and clarify the internal relations by reasonably formulating injection process, reasonably designing and manufacturing molds according to drawings, and even reasonably selecting injection equipment. Precision injection moulding is different from ordinary injection moulding in pressure and speed. Precision injection moulding often uses high or ultra-high pressure injection moulding. High-speed injection moulding can obtain smaller shrinkage rate.
制造商为大家介绍的“影响模具精密注塑的缘由是什么？”相关内容，想要了解更多内容，欢迎访问网站：http://www.jnhjgs.cnAbove is Shandong Mould Manufacturer's introduction of "What is the reason for affecting precision injection moulding of moulds?" For more information, please visit http://www.jnhjgs.cn