Bubbles and vacancies

(1) The melt temperature is too high. The forming temperature should be lowered appropriately.

(2) The injection pressure is too low. Appropriate treks should be made.

(3) The boosting time is too short. It should be extended appropriately.

(4) The holding time is too short. It should be extended appropriately.

(5) Mold temperature is too low. Appropriate treks should be made.

(6) poor monotony of materials. Pre-monotonic treatment should be carried out, and monotonic temperature and extended monotonic time should be trudged.

(7) There is obstruction in the channel. It should be eradicated.

(8) The cooling time of the automatic forming machine product in the die is too long. It should be shortened appropriately and the products after demoulding should be put in hot water.

Cold in the bath.

Stomata and trachoma

(1) Foreign impurities are mixed into the material. Eradication should be carried out.

(2) The injection pressure is too low. Appropriate treks should be made.

(3) less back pressure of screw. It should be increased appropriately.

(4) The screw speed is too high. It should be reduced appropriately.

(5) Bad exhaust of mould. Die exhaust should be increased.

(6) The cooling time of products in the mould is too short. It should be extended appropriately.

Welding mark and material flow mark

(1) The melt temperature is too low. Shaping temperature should be appropriately trudged.

(2) The injection pressure is too low. Appropriate treks should be made.

(3) Short supply. It is necessary to increase the amount of material supplied or replace it with a larger standard injection machine.

(4) Die temperature is too low. Appropriate treks should be made.

(5) The holding time is too short. It should be extended appropriately.

(6) The boosting time is too short. It should be extended appropriately.

(7) There are blockages in the gate and runner. It should be eradicated.

(8) Bad exhaust of die. The exhaust holes of the die should be increased or the clamping force should be lowered to exhaust at the clamping or fusion points.

(9) The structure of gating system is unreasonable. The runner method should be improved and the gate should be opened from scratch.

Cracks and filaments

(1) The melt temperature is too high. The forming temperature and the temperature distribution of the conditioning barrel should be properly lowered.

(2) The injection pressure is low. Appropriate treks should be made.

(3) Foreign impurities were mixed into the material. Eradication should be carried out.

(4) poor monotony of materials. The monotonous temperature and extended monotonous time should be trudged.

(5) The forming period is too long. It should be shortened appropriately.

(6) Screw back pressure is too high or too low. Appropriate adjustments should be made.

(7) The planning of gating system is unreasonable. Check whether the gate, runner and gate are blocked and adjust the gate reasonably.

The layout and cross-section of the entrance and passage.

Swirling pattern

(1) The melt temperature is too high or too low. Appropriate adjustments should be made.

(2) Too much material is supplied. Appropriate cuts should be made.

(3) Die temperature is too low. Appropriate treks should be made.

(4) Blocking of nozzle hole. It should be eradicated.

(5) The gate is not properly positioned. The opening should be chosen from scratch.

(6) There are blockages in the gate and runner. It should be eradicated.

Black spots and stripes

(1) Impurities are mixed into the material. Eradication should be carried out.

(2) The barrel temperature is too high or too low. Appropriate adjustments should be made.

(3) The temperature distribution in each section of the barrel is unreasonable. Appropriate adjustments should be made.

(4) The injection pressure is too high or too low. Appropriate adjustments should be made.

(5) The standard of gating system structure is too small, the positioning is inappropriate and the resistance of movement is too large. Gate and flow should be enlarged appropriately

Cross section of the channel to see if there is any obstruction in the channel.

(6) Bad exhaust of die. Die exhaust should be increased to improve the function of die exhaust.

(7) The barrel and nozzle parts have been in hot demand and stagnant angle. Lag angle should be repaired to eliminate the rush.

Moire and fog halo

(1) The melt temperature is too low. Shaping temperature should be appropriately trudged.

(2) Mold temperature is too low. Appropriate treks should be made.

(3) The injection pressure is too low. Appropriate treks should be made.

(4) Screw back pressure is too low. Appropriate treks should be made.

(5) Impurities are mixed into the material. Eradication or replacement of new materials should be carried out.

(6) The temperature distribution in each section of the barrel is unreasonable. Appropriate adjustments should be made.

(7) The moisture or volatile matter content in the guess is too high. Pre-monotonic treatment should be carried out.

Poor gloss and rough surface

(1) The melt temperature is too low. Shaping temperature should be appropriately trudged.

(2) The injection pressure is too low. Appropriate treks should be made.

(3) Die temperature is low. Appropriate treks should be made.

(4) Short supply. The supply should be increased.

(5) The gate is not properly positioned. The opening should be chosen from scratch.

(6) The cooling time is short. It should be extended appropriately.

(7) There is obstruction in the channel. It should be eradicated.

(8) The surface finish of die cavity is too poor. It should be polished and polished, and the surface finish should be trudged.

Sunken

(1) The melt temperature is too high. The forming temperature should be lowered appropriately.

(2) The injection pressure is too low. Appropriate treks should be made.

(3) The die temperature is too high. It should be reduced appropriately.

(4) Short supply. The supply should be increased.

(5) Supercharging time is too short. It should be extended appropriately.

(6) The cooling time is short. It should be extended properly and cooled slowly by placing the demoulded products in hot water bath.

To shorten the cooling time of products in the die.

(7) The holding time is too short. It should be extended appropriately.

(8) Bad exhaust of die. Die exhaust should be increased.

(9) There is obstruction in the channel. It should be eradicated.

Peeling layer

(1) Short supply. It is necessary to increase the amount of material supplied or replace it with a larger standard injection machine.

(2) Mold temperature is too low. Appropriate treks should be made.

(3) Foreign impurities were mixed into the material. Eradication or replacement of new materials should be carried out.