Mindblown: a blog about philosophy.
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Latch lock
The Functions of a Latch Lock: In the two-step parting, two-step ejection or cavity ejection mechanism, a latch lock unit is always employed to control the opening sequence and stroke of each mold plate. Though latch locks perform similar functions, they have a diversity of different structures. So, it is necessary to select the…
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Injection molding machine operation instruction and good habit
1.A great habit of injection molding machine operation is of enormous benefit to both machine service life, as well as production safety. (1)Before the Machine Starts ①Check to see whether there is any water or oil inside the electrical control box. Don’t turn it on if the machine is affected by moisture. It can only…
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Surface roughness -injection molding defects
Surface roughness means there is a lack of precision in the surface of a molded part, or an inconsistent level of precision all over the surface, e.g. some areas are glossier than the rest. The main reasons for surface roughness might lie in the injection molding machine, the mold, the process or the material. (1)Injection…
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Dimensional instability in plastic injection molding process
Dimensional instability means the dimensional changes of a molded part exceed the tolerance limit, for which the reasons might lie in the injection molding machine, the mold or the injection molding process. (1)Injection Molding Machine ①The application of different types of injection molding machine leads to the differences in injection molding conditions; ②Melt temperature fluctuation…
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Mold Structure encyclopaedias
Mold structure encyclopaedias Sositar mould have more than 15 years in mold manufacture field,and accumulate lots of experience in mold design and mold making process, to help the new entrants and our customers to understand mold better,we list some mold animation as below: three plates mold This is a a popular design for mold,the advantage…
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Cracks issue in plastic injection molding process
Cracks refer to the narrow crevices or crazes that occur on molded plastic part surface, of which the causes might lie in the injection molding machine, the mold, the process or the raw materials. (1) Injection Molding Machine Mainly because of the insufficient plasticizing capacity, i.e. the plasticizing capacity is too low, leading to inadequate…
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Discoloration issue in plastic injection molding
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.…
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PMMA Plastic Injection Molding Process
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…
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Weld lines defects in plastic injection molding process
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…
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PVC Plastic Injection Molding Process
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…
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