Material Analysis
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Insufficient Strength of Polypropylene Film
Problem Phenomenon
The tensile strength or tear strength of the film is lower than the standard requirement, and it is easily damaged in use.
Insufficient strength affects the protective function of the film, and is especially critical in heavy-duty packaging films and industrial films.
Cause Analysis
(1) The MFR of the raw material is 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 ratio in the raw material is too high
Solution
(1) Select a grade with a lower MFR to increase the molecular weight
(2) Control the extrusion temperature within the range of 200-280°C to avoid overheating 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 ratio to not exceed 10%
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.
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