Extrusion & Post
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Excessive POP blending ratio of polyolefin plastomer causes film stickiness
Problem Phenomenon
When the blending ratio of POP and PE is too high, the film surface becomes sticky, the winding sticks, and the opening property and subsequent processing are affected.
The higher the POP content, the more prominent the problem.
Cause Analysis
（1）POP has a high octene content, the material is soft, and the surface is very sticky
（2）The POP addition ratio exceeds 30% and the surface becomes sticky
（3）The slip agent and anti-blocking agent additions are insufficient
（4）The winding temperature is too high or the winding tension is too large
（5）The cooling is insufficient and the film temperature is too high during winding
Solution
（1）Control the POP addition ratio within the range of 10-30%
（2）Add sufficient slip agent (0.2-0.5%) and anti-blocking agent (0.1-0.3%)
（3）Fully cool the film, with the winding temperature not exceeding 35°C
（4）Appropriately reduce the winding tension
（5）Select POP grades with higher density (density ≥0.885g/cm³)
Key Takeaway
POP blending stickiness needs to be solved by controlling the ratio, increasing additives, and optimizing winding conditions.
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