Production & Quality
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PVC Pipe Rough Inner Wall
Problem Phenomenon
PVC pipe inner wall has spiral marks and roughness, affecting water flow resistance and hygiene performance, while the outer wall may be normal.
Cause Analysis
Poor melt convergence at the die head spider/flow channel (confluence marks), improper die temperature or uneven plasticization; degraded adhesion also roughens the inner wall; inner wall forming quality reflects the melt state before entering calibration.
Solution
①Optimize the die head flow channel and spider, ensure uniform melt convergence; ②Adjust die temperature; ③Improve plasticization quality, eliminate unplasticized particles; ④Clean die head adhesions; ⑤Check core mandrel temperature and surface condition.
Key Takeaway
For PVC rough inner wall, check 'die head convergence and plasticization': confluence marks and poor plasticization are the two major roots; inner wall quality is the mirror of die head design and plasticization uniformity — grasp from both die head and formula.
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