Normal solution for injection molding problems
Normal solution for Plastic injection molding test problems
The Plastic injection molding problem normally cause by many parameters, the following experience just for reference, may help to shorten the test time, reduce operation cost.
#01
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Main runner sticky
Methods and sequence of problem solving:
→1 Polishing the main runner →2 Match the nozzle central and mold central →3 Reduce the mold temperature →4 Shoten the injection time →5 Increase the cooling time →6 Check the machine nozzel heating circuit →7 Polishing mold surface →8 Check if material be polluted
#02
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Part release difficulty
Methods and sequence of problem solving:
→1 Reduce injection pressure →2 Shorten the injection time →3 increase the cooling time →4 reduce the mold temperature →5 polishing mold surface →6 increase the draft angle of the part →7 Add gas assistance to eliminate vacumm
#03
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Dimension not stable
Methods and sequence of problem solving:
→1 Change the temperature of feed cylinder →2 Increase the injection time →3 Increase the injection pressure →4 Change the screw back pressure →5 Increase the mold temperature →6 reduce the mold temperature→7 Adjust the feeding rate →8 Reduce the material return ratio.
#04
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Ripple on part surface
Methods and sequence of problem solving:
→1 Adjust the feeding amount →2 Increase the mold temperature →3 Increase the injection time →4 Increase the injection pressure →5 Increase the plastic temperature →6 Increase the injection speed →7 Increase the runner size and gate size.
#05
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Warping and deformation
Methods and sequence of problem solving:
→1 Reduce the mold temperature →2 Reduce plastic material temperature →3 increase the cooling time →4 Reduce the injection speed →5 Reduce the injection pressure →6 Increase the back pressure →7 Reduce the injection time
#06
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Plastic part surface peeling
Methods and sequence of problem solving:
→1 Check the plastic type and level →2 Check if material be polluted →3 Increase the mold temperature →4 Dry the plastic →5 Increase plastic temperature →6 Reduce the injection speed →7 Shorten the gate length →8 Reduce the injection pressure →9 Change the gate position →10 Use big gate nozzle
#07
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Silver stripes and runner sticky
Methods and sequence of problem solving:
→1 Reduce material temperature →2 Materials drying →3 Increase injection pressure →4 Increase gate size →5 Check the plastic type and level →6 Check material pollution
#08
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Dim surface
Methods and sequence of problem solving:
→1 Dry plastic material →2 Check whether the material is contaminated →3 Raise the material temperature →4 Increase injection pressure →5 Increase mold temperature →6 Polishing mold surface →7 Increase the size of gate and runner
#09
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Sink mark
Methods and sequence of problem solving:
→1 Adjust the feeding rate →2 Increase injection pressure →3 Increase injection time →4 Slows feeding speed →5 Reduce mold temperature →6 Add more venting →7 Increase runner size and gate size →8 Reduce runner length →9 Change gate location →10 Reduce injection pressure →11 Increase holding pressure
#10
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Air bubbles
Methods and sequence of problem solving:
→1 Dry materials →2 Reduce plastic temperature →3 Increase injection pressure →4 Increase injection time →5 Increase mold temperature →6 Decrease injection speed → 7 Add packing pressure
By: ARGO TEAM
Plastic mold maker, Plastic injection molding supplier - Argo Mold Limited www.argomold.com
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