Unstable wall thickness is the most common problem in used DWC (Double Wall Corrugated) pipe extrusion production. It directly causes defective pipes, unqualified ring stiffness, high scrap rate and material waste. Effective wall thickness control is essential for standard SN4/SN8 HDPE drainage pipe production.
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Core Information |
Details |
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DWC Wall Thickness Definition |
Consists of inner smooth layer and outer corrugated layer thickness, both need standard stable data. |
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Common Causes (Used Machine) |
Screw & barrel wear, die head carbon deposit/gap deviation, unstable temperature & speed, corrugator vacuum leakage. |
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Bad Impacts |
Pipe cracking, insufficient stiffness, raw material waste, unqualified finished products. |
Simple & Effective Control Methods
1. Inspect Screw & Barrel Worn accessories lead to unstable melt output. Check and replace worn parts before production.
2. Maintain Die Head Clean carbon deposits regularly and adjust die bolts evenly to avoid uneven wall thickness.
3. Stabilize Production Parameters Keep constant extrusion temperature and fixed screw speed, avoid frequent parameter adjustment.
4. Match Haul-off & Vacuum Fast haul-off causes thin wall; slow speed causes thick wall. Fix vacuum leakage of old corrugators timely.
Summary
Wall thickness control is the key to stable operation of used DWC pipe extrusion lines. Qingdao Confortune Machinery provides high-quality refurbished DWC extrusion lines, with professional parameter debugging and after-sales guidance to help customers produce qualified HDPE corrugated pipes stably.
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