PVC calendered film is one of the commonly used base films for color-changing films. It has the characteristics of light weight, high mechanical strength, good insulation performance and easy processing. Its calendering process is mainly: mixing - hot extrusion - calendering (extrusion, deflection, embossing) - cooling - winding.
Frequently asked questions
1. Film discoloration
Insufficient material stability Replace stabilizer or increase stabilizer dosage
Insufficient material lubricity Increase internal and external lubricant dosage
2.Poor film transparency
Poor PVC resin transparency Replace with a suitable PVC resin
The stabilizer has too much influence on transparency Replace with a stabilizer with better transparency
Improper lubricant selection Replace with a suitable lubricant
3.Shrinkage holes or spots on the surface
The raw materials have high moisture or volatile content replace the appropriate raw materials or improve the kneading process
The raw materials have many impurities check the raw materials and replace the raw materials with more impurities
4. The two layers of the film are sticky
Plasticizer precipitation Replace the appropriate plasticizer
Insufficient amount of lubricant Increase internal and external lubricants, especially external lubricants
5. Shadows or stripes on the surface
Uneven mixing of raw materials Improve kneading process to improve mixing uniformity
Presentation Check raw materials and replace materials prone to precipitation
Contamination or scratches on the roller surface Clean or repair the roller surface
6. Uneven film thickness
Poor plasticizing uniformity Adjust the formula to improve plasticizing uniformity
Partial decomposition of the material, uneven discharge Remove the decomposition products
7. Printing is not strong, heat sealing is poor
The amount of lubricant is too large reduce the amount of lubricant appropriately
Stabilizer precipitation or lubrication is too strong reduce the amount of stabilizer or replace the stabilizer
8. Film changes color after being stored for a period of time
Long-term stability of the material is insufficient adjust the formula to improve thermal stability
Improper combination of stabilizer and calcium carbonate system change the stabilizer or calcium carbonate type
9. Transparent film becomes foggy after being stored for a period of time
Excessive amount of external lubricant Reduce the amount of external lubricant appropriately
Stabilizer precipitates Reduce the amount of stabilizer or replace the stabilizer
10.Film sticking to roller
The formula is not lubricating enough increase the amount of internal and external lubricants
There is foreign matter on the roller surface clean the roller surface
In the production process of PVC calendered film, the calendering process is obviously a crucial link. Our calendering machine adopts a perfect process flow of mixing-hot extrusion-calendering (extrusion, deflection, embossing)-cooling-winding, which can ensure the production quality and stability of the product. At the same time, we are also equipped with a skilled production team to ensure the production efficiency and production quality of calendered films of materials such as PVC, providing customers with the best product experience and service guarantee.
https://www.potop-polymer.com/lab-calender-machine/desktop-calender-machine.html
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