Material Analysis
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Quality fluctuation caused by regrind use in styrene-acrylonitrile copolymer
Problem Phenomenon
After using regrind, product quality fluctuates, with color changes, strength decline or black spots appearing.
Cause Analysis
(1) Regrind is repeatedly processed, and molecular weight gradually decreases
(2) Different materials or impurities are mixed into the regrind
(3) Temperature is too high during regrind granulation, and the material partially degrades
(4) Regrind particle size is uneven, and feeding is unstable
(5) The regrind proportion is too high or inconsistent
Solution
(1) Control the regrind proportion to no more than 15-20%
(2) Use regrind no more than twice repeatedly
(3) Store regrind by category; different materials must not be mixed
(4) Control regrind granulation temperature at the lower value within the 200-260°C range
(5) Sieve regrind after crushing
Key Takeaway
Regrind use requires controlling proportion and times; category management is key.
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