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Dongguan Hongjia Plastic Materials Co., Ltd.
Contact: Mr. Wang
Mobile: 13713947716
Phone: 0769-82052656
Address: No. 5, Building 5, Phase 2, Zhangmutou Plastic Market, Dongguan City
Industry informationCurrent location: Home- > Industry information

PC plastic molding process problems

点击率: Release time: 2018-11-15 19:47:20 Click rate:

Causes and solutions
1.Silver wire
a. Moisture of raw materials ———— Dry raw materials
b. Resin decomposition due to overheating ———— Reduce molding temperature
c. The screw compression ratio is small, and the back pressure is insufficient --- increasing the back pressure
d, mold temperature is too low-heating mold
e. Poor exhaust ——— venting groove on mold parting surface
2.Bubble
a. Moisture of raw materials ———— Dry raw materials
b. Poor venting ———— Improve mold design
3, resin discoloration, black spots
a. Accumulation of barrels and nozzles ———— Cleaning barrels and nozzles
b, the molding temperature is too high ---- reduce the molding temperature
4.The product is not full
a, the plasticization of the material is not enough --- increasing the barrel temperature
b, the mold temperature is too low ----increase the mold temperature
c. Nozzle overflow-adjust the mold position
d 、 Injection pressure is too low ———— Increase injection pressure
e. Too little feeding amount ———— Adjust feeding amount
5, shrink vacuum bubble
a. Insufficient holding pressure ———— Extend the holding time
b, mold temperature is too low ----increase the mold temperature
c. Injection pressure is too low ———— Increase injection pressure
d. The mold design is unreasonable --- increasing the runner and gate size
e. The molding temperature is lower ———— increasing the barrel temperature
6.Transparency is reduced
a. Moisture of raw materials ———— Dry raw materials
b, the mold temperature is too low ----increase the mold temperature
c. Overheating decomposition of materials ———— Reduce molding temperature
7, welding marks
a. The mold design is unreasonable ———— Using ring gate and multi-point gate
b, the mold temperature is too low ----increase the mold temperature
c. Too much release agent ———— reduce the amount of release agent
d, the molding temperature is lower ———— increasing the barrel temperature
8. Product cracking
a, mold temperature is too low --- increase the mold temperature
b, the molding temperature is lower ———— increasing the barrel temperature
c, the relative molecular weight of the material is too small --- reselect the material
d. During the molding process, the relative molecular weight has decreased too much. Strict drying and shortening the molding cycle.
e. Forcibly demoulding --- Increasing cavity slope and improving mold structure
9, difficult to demold
a 、 Insufficient cooling in the mold ———— Reduce the molding temperature and extend the molding cycle
b. Cavity slope is too small ———— increasing cavity slope
c. Ejector device is bad ———— Improve ejector device
d. Rough surface of the mold ———— trim the mold and use mold release agent
10.Warping
a 、 Insufficient cooling in the mold ———— Reduce the molding temperature and extend the molding cycle
b, the temperature difference between the convex mold and the concave mold is larger ---- reduce the temperature difference between the convex mold and the concave mold
c. Gate location and size are unreasonable ———— Improve gate structure
11.Overflow
a 、 Injection pressure is too high ———— Reduce injection pressure
b, the molding temperature is too high ---- reduce the barrel temperature
c. Insufficient clamping force ———— Improve clamping force
d. Insufficient mold processing accuracy ———— Improve mold processing accuracy

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