Posts tagged "plastic molding"

Causes and solutions of shock lines, swelling and bulging in injection molded products The surface of rigid plastic parts such as PS, etc. near the gate forms dense corrugations centered on the gate, sometimes called shock lines. The reason for this is that when the melt viscosity is too large and the mold is filled in the form of stagnant flow, the front-end material quickly condenses and shrinks when it touches the surface of the

Reasons for fusion joints in injection molded products When molten plastic meets in multiple strands in the cavity due to holes in inserts, areas with discontinuous flow rates, or areas where the flow of mold filling material is interrupted, linear fusion joints are created because of incomplete fusion. In addition, fusion joints are also generated in the case of gate injection filling, and the strength of the fusion joints is poor. The main reasons are

Analysis of the causes of uneven color and luster defects in injection molded products The main causes and solutions of uneven color of injection molded products are as follows. (1) Poor colorant diffusion, this situation often makes patterns appear near the gate. (2) Poor thermal stability of plastic or colorant, to stabilize the color tone of the parts, the production conditions must be fixed strictly, especially the material temperature, material quantity and production cycle. (3)For

, blow molding, extrusion, die-casting or forging molding, smelting, stamping and other methods. In short, the mold is used to make the tool of molding items, this tool consists of various parts, different mold consists of different parts. It mainly realizes the processing of the shape of the article through the change of the physical state of the material being molded.   1 Effect of mold temperature on product appearance Higher temperatures improve the flow

5 common problems on the surface of TPE products injection molding The surface of TPE products injection molding products must be dried before injection molding if the requirements are strict. Generally, it is 70~80℃/2h for hopper drying or 80~100℃/1h for tray drying. For tray drying, it should be noted that the thickness of material layer is generally not more than 50mm is better. It is recommended to use tray drying. If the surface of the

The influence of injection molding process on the quality of products In the molding process of transforming plastic particles into plastic products, plastic is often subjected to high temperature and pressure, and flows under high shear rate. Different molding conditions and processes will have different effects on the quality of products. If the plastic raw materials are correctly selected, the technical parameters of the injection molding machine and the structure of the mold are in