Extrusion & Post
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Elongation at Break of Cast Polypropylene Film Not Up to Standard
Problem Phenomenon
The test result of the elongation at break of the film is lower than the standard requirement, affecting the use performance of the product.
Cast polypropylene film has strict requirements for elongation at break.
Cause Analysis
(1) Improper selection or treatment of raw materials
(2) Improper setting of the extrusion temperature (230-270°C)
(3) Unreasonable stretching process parameters (stretch ratio: no stretching)
(4) Improper cooling conditions (chill roll 15-40°C°C)
(5) Poor dispersion of additives in the raw material
Solution
(1) Select a suitable cast polypropylene film grade
(2) Optimize the extrusion temperature to a reasonable value within the range of 230-270°C
(3) Adjust the stretch ratio to a reasonable value within the no-stretching range
(4) Optimize the chill roll temperature to within the range of 15-40°C°C
(5) Ensure uniform dispersion of additives
Key Takeaway
Film performance needs to be systematically optimized from three aspects: raw materials, process, and cooling.
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