Processing Machinery
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PA6 Barrel Temperature Zoning
Problem Phenomenon
PA6 plasticizes unevenly, and unmelted particles are entrained in the products
Cause Analysis
The barrel temperature zoning is unreasonable; when the compression zone temperature is low, the material enters the metering zone before being fully melted, and the screw shear is insufficient to compensate, resulting in uneven plasticization with entrained raw material
Solution
Barrel temperature is set in a gradient of 230°C at the rear zone, 245°C at the middle zone, and 260°C at the front zone to ensure the material completes melting in the compression zone; back pressure is appropriately increased to strengthen shear mixing
Key Takeaway
The barrel temperature gradient is the foundation for ensuring plasticization quality, and the compression zone must reach a sufficient melting temperature; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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