Material Analysis
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Insufficient strength of linear low-density polyethylene film
Problem Phenomenon
The tensile strength or tear strength of the film is lower than standard requirements, and it is easily damaged during use.
Insufficient strength affects the protective function of the film and is especially critical in heavy-duty packaging film and industrial film.
Cause Analysis
(1) Raw material MFR is on the high side; low molecular weight results in poor strength
(2) Melt temperature is too high, causing material degradation
(3) Improper blow-up ratio or draw ratio results in unreasonable molecular orientation
(4) Film thickness is insufficient
(5) The proportion of regrind in the raw material is too high
Solution
(1) Select grades with lower MFR to increase molecular weight
(2) Control extrusion temperature within the 190-250°C range to avoid overheating degradation
(3) Optimize blow-up ratio (2-4) and draw ratio (3-6) to balance transverse and longitudinal strength
(4) Check and adjust film thickness to the standard value
(5) Control the regrind proportion to no more than 10%
Key Takeaway
Insufficient film strength is caused by improper material selection or process parameters and needs to be optimized from raw material, temperature and blow-up ratio.
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