The influence of pvc transparent film calendering effect
The production process of pvc transparent film includes calendering and blow molding. Each process will have different effects on pvc transparent film and pvc film. Let's introduce the influence of lower calendering.
We know that when the material passes through two oppositely rotating cylinders, the pvc film is subjected to strong shear stress and tensile stress, and the pvc molecules will undergo molecular orientation along the rolling direction, so that the film has various physical and mechanical properties. Anisotropy, this is the calendering effect. The stronger the calendering effect, the greater the shrinkage of the product during secondary processing. This is due to heat or stress relaxation, the macromolecules in the original orientation are restored to a curled state.
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