Material Analysis
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Quality Fluctuation Caused by the Use of Cast Polypropylene Film Regrind
Problem Phenomenon
After using regrind, the product quality fluctuates, with color changes, strength reduction, or black specks appearing.
Cause Analysis
(1) The regrind is repeatedly processed multiple times, and the molecular weight gradually decreases
(2) Different materials or impurities are mixed into the regrind
(3) The temperature is too high during regrind pelletizing, and the material partially degrades
(4) The regrind particle size is uneven, and the feeding is unstable
(5) The regrind ratio is too high or inconsistent
Solution
(1) Control the regrind ratio to not exceed 15-20%
(2) The regrind is not reused more than twice
(3) Store the regrind by category; different materials must not be mixed
(4) Control the regrind pelletizing temperature at the lower value within the range of 230-270°C
(5) Sieve the regrind after crushing
Key Takeaway
The use of regrind requires controlling the ratio and the number of times; classified management is the key.
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