Processing Machinery
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Product shows multiple defects (silver streaks, burnt, short shot, etc.)
Problem Phenomenon
Product shows multiple defects (silver streaks, burnt, short shot, etc.), related to unreasonable barrel temperature settings
Cause Analysis
Barrel zone temperature settings unreasonable, not set according to the cellulose acetate butyrate recommended range 170-230°C
Large temperature fluctuation, thermocouple or heater band failure
Front zone temperature too high, rear zone temperature on the low side, uneven melt
Unreasonable temperature gradient setting causing poor plasticization
Temperature control system slow response, large deviation between actual temperature and setpoint
Solution
Reasonably set each zone temperature according to the 170-230°C range
Check and maintain the temperature control system to ensure stability
Reasonably set temperature gradient increasing from rear zone → front zone
Appropriately lower front zone temperature to prevent degradation
Calibrate the temperature control system to reduce deviation
Key Takeaway
Barrel temperature needs to be stably set according to the material recommended range
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