Control elements of pvc wrap transparency
hangzhou yinxin
The transparency of pvc wrap is related to whether the product can meet the quality requirements. Here, Xiaobian will introduce you how to control the transparency of pvc wrap:
1, pvc wrap film is crystalline material, easy crystallization, if not fast cooling, is bound to reduce transparency and elongation at break. Blow molding processing cooling effect is poor, crystallinity is high, thin film transparency is low.
2, due to blowing, drafting, molecular orientation is serious, resulting in low elongation at break; The cooling effect is good, the crystallinity is low, the transparency is good, the orientation is low, so the elongation at break is high, the retraction is good.
3. Appropriate amount of anti-fogging agent should be added.
4, on the basis of the above, add transparent nucleating agent.
5, pvc wrap material selection on the choice of low fog degree, high melting fingers.