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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…
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Optimum Injection Speed in Plastic Injection Molding
Optimum Injection Speed The optimum injection speed allows us to maintain minimum injection pressure under given conditions. Injection speed should vary with cavity thickness. Compared with the thick ones, the thin ones possess a smaller effective flow cross-section. As a result, we need to raise injection speed, improve overall deformation rate and increase frictional…
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Holding pressure in plastic injection molding
Holding Pressure Setting (1) The Significance of Pressure Holding/Pack After the mold cavity is filled, holding pressure is applied to compensate for resin shrinkage caused by cooling. Appropriate holding pressure and holding time will be maintained to push the mold screw, to continue injecting molten resin into the cavity. Holding pressure has a great…
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Injection pressure for plastic injection molding
Injection Pressure Injection pressure refers to the force that helps molten resin overcomes the resistance to flow. When the mold screw reaches changeover to holding pressure, the pressure on screw front end is referred to as injection pressure. Fill the entire cavity with a pressure lower than the max. injection pressure of the injection molding…
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The runner of plastic injection mold
1.The runner type 2.Series diameter(mm)：2 2.5 3 3.5 4 4.5 5 6 7 8 （10 12 for reference） 3.How to design the runner diameter for different material For PE,PA .etc. we can choose smaller diameter,but for PC,PMMA,we choose bigger diameter. 4. Helpful Tips: (1). For a U-shaped runner, the size of the runner can be…
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