Processing Machinery
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Insufficient strength of linear low-density polyethylene film (variant: strengthened measures)
Fenómeno del problema
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.
Especially, additional attention is needed on top of the original basis; this problem is more prominent and requires focused attention.
Análisis de la causa
(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
(6) On top of the original basis, additional attention is needed as process parameter fluctuations or equipment condition changes aggravate this problem
Solución
(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%
(6) And strengthen process monitoring; on top of the original basis, additional attention is needed to pay special attention to parameter stability
Conclusión clave
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.
In different production scenarios, targeted preventive measures need to be taken.
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