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Transparent plastics processing defects prevention!
Dec 26, 2016

 Crack and threads

(1) the materials are not fully dry. Pre-drying temperature should be increased and extended drying time.

(2) raw materials mixed with foreign objects impurities. Should be completely clear.

(3) the melt temperature is too high. Should be adjusted lower temperature and temperature distribution in cylinder.

(4) low injection pressure. Should be increased.

(5) the unreasonable design of gating system. Should adjust the layout and sections of the sprue and runner sizes.

(6) the cycle too long. Should be shortened.

(7) screw back pressure too high or too low. Should be adjusted.

Second, moire and fog Halo

(1) the melt temperature is too low. Should increase the molding temperature.

(2) the injection pressure is too low. Should be increased.

(3) screw back pressure is too low. Should be increased.

(4) the temperature is too low. Should be increased.

(5) materials mixed with foreign objects impurities. Should be thoroughly cleaned or changed with the new material.

(6) the moisture and volatile matter content in the raw materials is too high. The drying process.

(7) barrel and its distribution sector temperatures unreasonable. Should be adjusted.

Third, weld and flow mark

(1) the melt temperature is too low. Should increase the molding temperature.

(2) the injection pressure is too low. Should be increased.

(3) lack of feeding. Should be appropriate to increase the amount of feed or swap with a bigger injection moulding machine.

(4) holding time is too short. Should be appropriately extended.

(5) the boost time is too short. Should be appropriately extended,

(6) feed system is unreasonable. Flow should be improved, the gate should be re-run of elections open.

(7) block the gate and runner. Should be completely clear.

(8) the temperature is too low. Should be increased.

(9) mold venting. Vent or reduce the clamping force should be added. In line or exhaust at the melting point.


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