Processing Machinery
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Insufficient strength of polyolefin plastomer films (Variant: Enhanced Measures)
Problem Phenomenon
The tensile strength or tear strength of the film is lower than the standard requirements, and it is easily damaged during use.
Insufficient strength affects the protective function of the film and is particularly critical in heavy-duty packaging films and industrial films.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires focused attention.
Cause Analysis
（1）The raw material MFR is too high, the molecular weight is low, and the strength is poor
（2）The melt temperature is too high and the material degrades
（3）The blow-up ratio or draw ratio is improper and the molecular orientation is unreasonable
（4）The film thickness is insufficient
（5）The regrind proportion in the raw material is too high
（6）On the original basis, additional attention is needed: fluctuations in process parameters or changes in equipment status have aggravated this problem
Solution
（1）Select grades with lower MFR to increase the molecular weight
（2）Control the extrusion temperature within the range of 180-230°C to avoid overheating and degradation
（3）Optimize the blow-up ratio (2-4) and draw ratio (3-6) to balance the longitudinal and transverse strength
（4）Check and adjust the film thickness to the standard value
（5）Control the regrind proportion to no more than 10%
（6）And strengthen process monitoring; on the original basis, additional attention is needed to pay special attention to parameter stability
Key Takeaway
Insufficient film strength is caused by improper material selection or process parameters, and needs to be optimized from raw materials, temperature, and blow-up ratio.
Targeted preventive measures need to be taken in different production scenarios.
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