Category: Technology
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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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The cause and solution for injection molding defect silver streak
■ Silver Streaks
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The root cause and solution for warpage in plastic injection molding
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…
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How to solve the injection molding defection Jetting?
Jetting
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PC (Polycarbonate)Plastic Injection Molding Process
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…
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ABS Plastic Injection Molding Process
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.…
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Injection molding speed in plastic molding process
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…