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Injection molding product surface gloss and colour the defect reason and solution
by：CSSSLD
2021-01-23
Injection molding product surface gloss and colour defect reasons and solutions of
usually is obtained by this method of injection molding plastic products surface has good gloss and beautiful color, but in actual injection process a lot of plastic injection mold factory production of products on the color and luster is larger defects, in addition to plastic raw materials, colorants and mould surface finish these hard factors, what reason can lead to appear this kind of circumstance? ( 1) Mould finish is poor, cavity surface such as rust, mold venting is not good. ( 2) Mould gating system has defects, we should increase the cold slug well, increase the flow channel, polishing the mainstream way, distributary channel and the gate. ( 3) Material temperature and mold temperature on the low side, gate local heating way if necessary. ( 4) Processing pressure is too low, too slow, insufficient injection time and back pressure, density difference and make the surface of the dark. ( 5) To fully plastic, but to prevent the degradation of material, heat stability, cooled to sufficiently, especially thick wall. ( 6) Prevent cold material from entering the product, if necessary, to switch to the lock type spring or decrease the temperature of nozzle. ( 7) Use the reworked material too much, plastic or poor quality of colorant, mixed with water or other impurities, use the poor quality of lubricant. ( 8) Clamping force should be enough.
injection mould in lateral dent on how to deal with the
injection mould in lateral dent is due to the gate after sealing or lack of material from within the local contraction caused by injection. Micro injection molding products surface concave or trap is an old problem in the process of injection molding.
dent is usually caused by plastic wall thickness to increase product shrinkage rate of local increase. The degree of expansion and contraction depends on many factors, so, injection mold in lateral dent?
one, the pressure in the molding process, the cavity additional injection plastic material, to compensate for mold shrinkage. In most cases, the gate much thinner than the rest of the parts, the mold piece is still very hot and sustained contraction, the small gate has been cured, after curing, pressure within the cavity on molding parts doesn't work.
2 and a half of crystalline plastics materials molding shrinkage rate is high, which makes the dent problem is more serious; An amorphous materials of lower mold shrinkage, will decrease the indentation to the greatest extent; Filling and maintain enhanced materials, the shrinkage rate is lower and the probability of dent.
3, thick plastic cooling time is long, will produce larger shrinkage, so big thickness is the fundamental cause of indentation, the design should pay attention to avoid thick wall parts, if not be able to avoid a thick wall, should be designed as a hollow, thick parts is smooth transition to the nominal wall thickness, with a large circular arc instead of Angle, can eliminate or reduce maximum Angle near the dent.
the injection mold ejection system what is the role of the
demoulding system we use the most basic part of the process of injection mold, so he is in the process of injection molding of what role does, mold factory, can according to the role of the ejection system, any normal demoulding mechanism can be really high remove products from one side in the template, and at the time of discharge of clamping parts to cooperate, ensure normal operation does not interfere with the other mould parts.
the ejection mechanism: in order to make the simple structure, easy processing, generally USES the dome. Pipe jacking ejection mechanism: at the bottom of the cylinder part is the general of pipe jacking products, stable and reliable action, when out contact with the surrounding products, make the product is out of shape not easily, also no obvious ejection trace.
push board the pop-up mechanism: often used in the rectangle. Circular thin-walled deep groove wall products and lateral concave or circular groove core. Inclined top and swinging rod demoulding mechanism: lateral concave or convex edge product USES the stripping, simple structure, processing complex, inclined top the top should be lower than 0. 05 mm 0. 1 core end face, ejection, product pellet at the bottom. The bevel of slider should choose between 5 to 10 degrees.
usually is obtained by this method of injection molding plastic products surface has good gloss and beautiful color, but in actual injection process a lot of plastic injection mold factory production of products on the color and luster is larger defects, in addition to plastic raw materials, colorants and mould surface finish these hard factors, what reason can lead to appear this kind of circumstance? ( 1) Mould finish is poor, cavity surface such as rust, mold venting is not good. ( 2) Mould gating system has defects, we should increase the cold slug well, increase the flow channel, polishing the mainstream way, distributary channel and the gate. ( 3) Material temperature and mold temperature on the low side, gate local heating way if necessary. ( 4) Processing pressure is too low, too slow, insufficient injection time and back pressure, density difference and make the surface of the dark. ( 5) To fully plastic, but to prevent the degradation of material, heat stability, cooled to sufficiently, especially thick wall. ( 6) Prevent cold material from entering the product, if necessary, to switch to the lock type spring or decrease the temperature of nozzle. ( 7) Use the reworked material too much, plastic or poor quality of colorant, mixed with water or other impurities, use the poor quality of lubricant. ( 8) Clamping force should be enough.
injection mould in lateral dent on how to deal with the
injection mould in lateral dent is due to the gate after sealing or lack of material from within the local contraction caused by injection. Micro injection molding products surface concave or trap is an old problem in the process of injection molding.
dent is usually caused by plastic wall thickness to increase product shrinkage rate of local increase. The degree of expansion and contraction depends on many factors, so, injection mold in lateral dent?
one, the pressure in the molding process, the cavity additional injection plastic material, to compensate for mold shrinkage. In most cases, the gate much thinner than the rest of the parts, the mold piece is still very hot and sustained contraction, the small gate has been cured, after curing, pressure within the cavity on molding parts doesn't work.
2 and a half of crystalline plastics materials molding shrinkage rate is high, which makes the dent problem is more serious; An amorphous materials of lower mold shrinkage, will decrease the indentation to the greatest extent; Filling and maintain enhanced materials, the shrinkage rate is lower and the probability of dent.
3, thick plastic cooling time is long, will produce larger shrinkage, so big thickness is the fundamental cause of indentation, the design should pay attention to avoid thick wall parts, if not be able to avoid a thick wall, should be designed as a hollow, thick parts is smooth transition to the nominal wall thickness, with a large circular arc instead of Angle, can eliminate or reduce maximum Angle near the dent.
the injection mold ejection system what is the role of the
demoulding system we use the most basic part of the process of injection mold, so he is in the process of injection molding of what role does, mold factory, can according to the role of the ejection system, any normal demoulding mechanism can be really high remove products from one side in the template, and at the time of discharge of clamping parts to cooperate, ensure normal operation does not interfere with the other mould parts.
the ejection mechanism: in order to make the simple structure, easy processing, generally USES the dome. Pipe jacking ejection mechanism: at the bottom of the cylinder part is the general of pipe jacking products, stable and reliable action, when out contact with the surrounding products, make the product is out of shape not easily, also no obvious ejection trace.
push board the pop-up mechanism: often used in the rectangle. Circular thin-walled deep groove wall products and lateral concave or circular groove core. Inclined top and swinging rod demoulding mechanism: lateral concave or convex edge product USES the stripping, simple structure, processing complex, inclined top the top should be lower than 0. 05 mm 0. 1 core end face, ejection, product pellet at the bottom. The bevel of slider should choose between 5 to 10 degrees.
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