1, the sheet is nebulee causes: color masterbatch poor dispersion in the sheet, low processing temperature, resin temperature is too high. Solution: to improve the temperature of the material, and improve the die lip temperature, lower the temperature in the cylinder, the lower the temperature in the die lip, improve color masterbatch dispersion.

2, sheet with vertical stripes reason: raw material or color masterbatch have impurities, die lip with impurities. Solution: to strengthen the filtering.

3, sheet inside the bubble causes: raw material or color masterbatch moisture, high processing temperature. Solution: lower processing temperature, material and color masterbatch drying.