Common Issues with PVC Conduit and Industrial-Grade Solutions

Rough pipe surface with pitting

Uneven raw material mixing, insufficient lubricant; low extrusion temperature, poor melt plasticization 1. Adjust formulation; 2. Optimize mixing process; 3. Adjust extrusion temperature

Bubbles or pinholes on pipe inner wall

Moisture in raw material (PVC resin absorbs moisture), excessive volatiles in formulation; Insufficient vacuum in sizing tank

1. Pre-treat raw material; 2. Optimize formulation; 3. Adjust equipment settings

Uneven wall thickness, excessive ovality

Mold core misalignment, unstable haul-off speed; sizing sleeve misaligned with mold center 1. Calibrate equipment; 2. Stabilize haul-off; 3. Correct sizing sleeve alignment

Pipe prone to breakage, poor impact resistance

Insufficient toughening agent, excessive calcium carbonate; rapid cooling causing internal stress concentration

1. Adjust formulation; 2. Optimize cooling process; 3. Select high-impact PVC resin

Pipe compressive strength fails to meet standard (≤1.0MPa)

Low raw material purity, improper reinforcing filler ratio; Insufficient extrusion pressure, low melt density

1. Upgrade raw materials; 2. Adjust formulation; 3. Adjust equipment settings

Pipe cut edges crack or exhibit burrs

Excessive cutting speed, dull blades; pipes not fully cooled and set

1. Perform equipment maintenance; 2. Extend cooling time; 3. Treat cut edges

Pipes age and become brittle during use (outdoor applications)

Absence of antioxidants and UV absorbers; thermal stabilizers in formulation degraded

1. Optimize formulation; 2. Use weather-resistant additives; 3. Surface treatment: Apply film coating or anti-aging coating to outdoor pipes

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