Common Problems and Causes in the Production and Processing of PVC Pipes
Release time：2020-07-21
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1. Lumps protruding from the pipe wall (bubble-like)
Possible causes: Excessive moisture in the material; impurities mixed into the material; poor plasticization.
2. Rough inner surface of the pipe
Possible cause: Poor plasticization.
3. Irregular indentations on the inner surface of the pipe
Possible causes: Impurities in the material; poor plasticization.
4. The pipe wall surface lacks luster, with one half shiny and the other dull
Possible causes: Inadequate plasticization; CaCO₃ particle size is too large or distribution is too broad; precipitates adhering to the die wall; insufficient external lubricant content.
5. Uneven pipe wall thickness
Possible causes: Poor plasticization uniformity; partial decomposition of the material.
6. Black streaks or spots on the pipe surface
Possible causes: Uneven dispersion of carbon black, pigments, and stabilizers; poor flowability.
7. Discoloration or charred particles on the pipe surface
Possible causes: Insufficient material stability; excessive shear and friction in the material.
