Processing Machinery
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PPS barrel segmented temperature
Problem Phenomenon
Uneven plasticization causes cloud patterns on products, or excessive front-section temperature causes nozzle drooling and stringing
Cause Analysis
PPS barrel segmentation: rear section about 270-290℃, middle section 300-320℃, front section 300-320℃, nozzle 290-320℃; too high rear section causes pellet bridging, too high front section causes drooling
Solution
①Barrel rear section 270-290℃, middle and front sections 300-320℃; ②nozzle 290-320℃ independently controlled; ③hopper seat cooling to prevent bridging
Key Takeaway
PPS barrel temperature gradient must balance bridging prevention and drooling prevention; independent nozzle temperature control is the key at the end of the temperature chain; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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