Discoloration means the surface color of a molded part is not consistent with the required color. Discoloration may be caused by a variety of reasons, which may cover the several aspects of injection molding machine, mold, process and raw materials, etc. (1) Injection Molding Machine ① Equipment is not clean and needs to be cleansed. […]
PMMA, i.e. polymethyl methacrylate, also known as acrylic or organic glass, is a transparent thermoplastic with a relative density of 1.19, which is higher than that of water. With a high surface glossiness, the PMMA products are characterized by strength, rigidity and toughness. The process features of PMMA: due to the high viscosity, PMMA has […]
Weld Lines The flowing defects on product surface or the linear defects that are caused when melt fronts meet each other after splitting. Weld lines refer to the lines that occur on a plastic product surface when the cold slug melts. In areas of mold cavity where the molten plastic meets inserts or holes, areas […]
PVC, i.e. polyvinyl chloride, is a multi-component plastic material that is often applied in the form of pellets. In addition to the previously mentioned PVC resin powder, some other components are needed, e.g. adding plasticizer to improve its fluidity, adding stabilizer to improve its thermal stability, adding lubricant to improve its mold releasing performance, as […]
Warpage Warpage is caused by shrinkage variations throughout the part. Warpaging is mainly caused by: – The cooling time difference caused by the temperature difference between the upper and lower surfaces of the mold, which causes difference in internal residue stress. – The pressure (injection pressure, holding pressure) difference inside the product will be reflected […]
With outstanding performances, PC (Polycarbonate) plastics are highly transparent, impact-/creep-resistant and can be applied within a wide range of temperature conditions. The technological characteristics of PC include: the viscosity of molten PC is not so sensitive to shear rate, but temperature; no clear melting point; the melt is highly viscous; the resin tends to decompose […]
Analysis of the ABS Plastic Injection Molding Process Thanks to its outstanding mechanical strength and excellent overall performance, ABS plastic injection molding plays an important role in many industries that include plastic product manufacturing, electronics, machinery and building materials. Usually, in plastic product manufacturing, plastic decorative pieces that require electroplating also adopt the ABS plastics. […]
the injection molding speed The injection speed relative to injection pressure shows a U-curve. If the injection speed is too low, heat loss will be greater than heat generation, causing flow temperature to drop, viscosity to increase and solidification layer to thicken. So, resistance to flow, as well as injection pressure will rise. On the […]