Material Analysis
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Insufficient strength of low density polyethylene film
Problem Phenomenon
Film tensile strength or tear strength is lower than standard requirements, easily damaged in use.
Insufficient strength affects the protective function of the film, especially critical in heavy-duty packaging film and industrial film.
Cause Analysis
(1) Raw material MFR too high; low molecular weight, poor strength
(2) Melt temperature too high, material degradation
(3) Improper blow-up ratio or draw ratio, unreasonable molecular orientation
(4) Insufficient film thickness
(5) Excessive regrind ratio in raw material
Solution
(1) Select grades with lower MFR, increase molecular weight
(2) Control extrusion temperature within the 160-220°C range, avoid overheating degradation
(3) Optimize blow-up ratio (2-4) and draw ratio (3-6), balance longitudinal and transverse strength
(4) Check and adjust film thickness to standard value
(5) Control regrind ratio not exceeding 10%
Key Takeaway
Insufficient film strength is caused by improper material selection or process parameters; it needs to be optimized from raw material, temperature, and blow-up ratio.
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