Let's learn about the causes and solutions of these faults in plastic film blowing machine blown film.
1. The film is too sticky and the opening is poor
Fault causes: ① The type of resin raw material is wrong, it is not a film-blowing grade low-density polyethylene resin particle, does not contain end-capping agent or has a low end-capping agent content; ② The temperature of the molten resin is too high and the fluidity is too large; ③ The inflation ratio of the plastic film blowing machine is too large, which will make the opening of the film worse; ④ The cooling speed is too slow, the film is not cooled sufficiently, and mutual adhesion occurs under the pressure of the pull roller; ⑤ The traction speed is too fast.
Plastic film blowing machine
Solutions: ① Replace the resin raw material, or add a certain amount of loosening agent in the barrel; ② Appropriately reduce the extrusion temperature and resin temperature of the plastic film blowing machine; ③ Appropriately reduce the inflation rate; ④ Increase the air volume, improve the cooling effect, and speed up the film cooling speed; ⑤ Appropriately reduce the traction speed of the plastic film blowing machine.
2. Poor transparency of film
Causes of failure: ① The extrusion temperature is too low, the resin is not well plasticized, resulting in poor transparency after film blowing; ② The inflation rate is too small; ③ The cooling effect is not good, affecting the transparency of the film; ④ The moisture content in the resin raw material is too high; ⑤ The traction speed of the plastic film blowing machine is too fast, and the film is not fully cooled.
Solution: ① Appropriately increase the extrusion temperature to make the resin plasticized evenly; ② Appropriately increase the inflation rate; ③ The plastic film blowing machine increases the air volume to improve the cooling effect; dry the raw materials; ⑤ Appropriately reduce the traction speed.
3. Film wrinkling
Causes of failure: ① Uneven film thickness; ② Insufficient cooling effect; ③ The inflation ratio is too large, causing the film bubble to be unstable, swinging back and forth, and easy to wrinkle; ④ The angle of the splint of the plastic film blowing machine is too large, the film is flattened within the distance, and the film is easy to wrinkle.
Solution: ① Adjust the film thickness to ensure uniform thickness; ② Improve the cooling effect to ensure sufficient cooling of the film; ③ Appropriately reduce the inflation rate; ④ Appropriately reduce the splint angle of the plastic film blowing machine to ensure that the film is evenly stressed.
