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Injection products is not complete, process on how to overcome?
by：Lisson
2020-11-17
Injection products is not complete, process on how to overcome?
Injection products is not complete, process on how to overcome?
problem: injection products is not complete, process on how to overcome?
answer: feed improper adjustment, lack of materials or materials
measurement is allowed to or control of feeding system operation is not normal, and the limit of the injection mould or operating conditions lead to abnormal injection cycle, plastic small back pressure or machine barrel inside small grain density is likely to be due to lack of material, the number of large particles, gap of aggregate and the volume change of the crystalline is big plastic such as polyethylene, polypropylene, nylon and other plastic such as ABS and high viscosity should be adjusted higher feed rate, feed temperature on the high side should be adjustable for big shoes.
when the barrel end material stock too much, when the injection screw consumes extra of injection pressure to compress and promote barrel in excess, according to the material, it greatly reduces the effective shot into the cavity of the plastic pressure and make the products full of hard.
low injection pressure, injection time is short, piston or screw back early
the molten plastic viscosity under low working temperature is higher, the liquidity is poor, should be injected at high pressure and speed. Such as color parts in the system of ABS, no high temperature resistance of the colorant limits the heating temperature of barrel, it will be in a higher than usual injection pressure and injection time to make up for longer.
slow injection speed
the injection speed for some complex shape, thickness change is big, process, long products, as well as the high viscosity of plastic, such as increasing toughness ABS is very prominent. When using high pressure can not be filled with products, should consider adopting high speed injection to overcome note of discontent.
material low temperature
barrel front end temperature is low, the molten material into the cavity due to the effect of cooling of the mold and make the viscosity rise to prematurely gets out of flow, hinders the far side of filling mold; Barrel after a period of low temperature, viscosity large plastic flow is difficult, hindered the forward of the screw, the result looks like the pressure of the pressure gauge shows enough and actually under low pressure low melting into the cavity.
the nozzle low temperature could be fixed when feeding nozzle for a long time in contact with the cold mould dissipating the heat, and insufficient nozzle heating coil heating or poor contact material temperature is low, can block the mould filling channel; If the mould without cold slug well, with self-locking nozzle, use after charging procedure, the nozzle is to maintain the required temperature; Just switched on when the nozzle is too cold can sometimes made outside heating to speed up the flame gun nozzle heats up. Conversion table packaging printing knowledge
problem: injection products is not complete, process on how to overcome?
answer: feed improper adjustment, lack of materials or materials
measurement is allowed to or control of feeding system operation is not normal, and the limit of the injection mould or operating conditions lead to abnormal injection cycle, plastic small back pressure or machine barrel inside small grain density is likely to be due to lack of material, the number of large particles, gap of aggregate and the volume change of the crystalline is big plastic such as polyethylene, polypropylene, nylon and other plastic such as ABS and high viscosity should be adjusted higher feed rate, feed temperature on the high side should be adjustable for big shoes.
when the barrel end material stock too much, when the injection screw consumes extra of injection pressure to compress and promote barrel in excess, according to the material, it greatly reduces the effective shot into the cavity of the plastic pressure and make the products full of hard.
low injection pressure, injection time is short, piston or screw back early
the molten plastic viscosity under low working temperature is higher, the liquidity is poor, should be injected at high pressure and speed. Such as color parts in the system of ABS, no high temperature resistance of the colorant limits the heating temperature of barrel, it will be in a higher than usual injection pressure and injection time to make up for longer.
slow injection speed
the injection speed for some complex shape, thickness change is big, process, long products, as well as the high viscosity of plastic, such as increasing toughness ABS is very prominent. When using high pressure can not be filled with products, should consider adopting high speed injection to overcome note of discontent.
material low temperature
barrel front end temperature is low, the molten material into the cavity due to the effect of cooling of the mold and make the viscosity rise to prematurely gets out of flow, hinders the far side of filling mold; Barrel after a period of low temperature, viscosity large plastic flow is difficult, hindered the forward of the screw, the result looks like the pressure of the pressure gauge shows enough and actually under low pressure low melting into the cavity.
the nozzle low temperature could be fixed when feeding nozzle for a long time in contact with the cold mould dissipating the heat, and insufficient nozzle heating coil heating or poor contact material temperature is low, can block the mould filling channel; If the mould without cold slug well, with self-locking nozzle, use after charging procedure, the nozzle is to maintain the required temperature; Just switched on when the nozzle is too cold can sometimes made outside heating to speed up the flame gun nozzle heats up. Conversion table packaging printing knowledge
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