Material Analysis
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Batch Instability of Impact Strength of Cast Polypropylene Film Products
Problem Phenomenon
The impact strength test results of different batches of products fluctuate greatly, sometimes passing and sometimes failing.
Cause Analysis
(1) Raw material batch differences, with different molecular weights or rubber contents
(2) Processing temperature fluctuations, with different degrees of material degradation
(3) Inconsistent regrind ratios, causing performance fluctuations
(4) Different internal stresses of the products, causing impact strength differences
(5) Inconsistent test conditions
Solution
(1) Establish incoming inspection standards for raw materials
(2) Strictly control the processing temperature within the range of 230-270°C
(3) Unify the regrind ratio
(4) Optimize the process parameters to reduce internal stress
(5) Unify the test conditions and sample preparation methods
Key Takeaway
The stability of impact strength depends on the consistency of raw materials and the stability of the process.
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