Extrusion & Post
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Poor blending stability of polyolefin plastomer POP and PE (Variant: Enhanced Measures)
Problem Phenomenon
Delamination or uneven dispersion occurs when POP and PE are blended and extruded, and the mechanical properties and appearance of the product are uneven.
Poor blending stability affects the consistency of product performance.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires focused attention.
Cause Analysis
（1）The compatibility of POP and PE is limited, which is more obvious when the octene content differs greatly
（2）The mixing is insufficient and the POP and PE particles are not uniformly mixed
（3）The screw mixing capacity is insufficient
（4）The extrusion temperature is improper, and the large melt viscosity difference makes dispersion difficult
（5）The raw material particle size differs greatly
（6）On the original basis, additional attention is needed: fluctuations in process parameters or changes in equipment status have aggravated this problem
Solution
（1）Premix POP and PE before adding to the hopper, using a mixer for 5-10min
（2）Select POP and PE grades with good compatibility
（3）Add mixing elements to the screw design
（4）Adjust the extrusion temperature so that the viscosities of the two materials are close
（5）Add a compatibilizer (such as a block copolymer) when necessary
（6）And strengthen process monitoring; on the original basis, additional attention is needed to pay special attention to parameter stability
Key Takeaway
Blending stability needs to be improved from three aspects: mixing, screw design, and material matching.
Targeted preventive measures need to be taken in different production scenarios.
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