How to Solve the Problem of Uneven Wall Thickness in Products

1. Uneven Circumferential Wall Thickness (One Side Thicker Than the Other)

Adjust the die head concentricity bolts and correct the gap between the die and mandrel.

Check if the temperature is uniform in each area of the die head to avoid local over-plasticization.

Correct the center line of the sizing sleeve and traction machine to prevent pipe deviation.

Check if the mandrel is bent and the die is deformed.

2. Uneven Longitudinal Wall Thickness (One Section Thicker Than the Other)

Stable Extrusion Volume: Ensure uniform screw speed, feeding, and temperature.

Stable Traction Speed: Prevent slippage and vibration.

Maintain constant vacuum sizing pressure and cooling water temperature.

Avoid frequent machine adjustments and screen changes.

3. Quick Judgment Formula

Uneven thickness circumferentially → Adjust die concentricity

Uneven thickness segment by segment → Stabilize extrusion and traction

Suddenly large or small thickness → Check vacuum, cooling, and feeding.

Strictly follow these steps to solve uneven pipe thickness, and improve plastic pipe extrusion line production efficiency. Regular inspection of equipment also helps prevent recurring issues.

About Kairun Machinery:

With 17 years of specialized expertise, Kairun Machinery Co., Ltd. is a leading manufacturer in the plastics industry, seamlessly integrating R&D, production, sales, and comprehensive after-sales service.

By leveraging our extensive manufacturing history and deep technical heritage, we deliver high-performance, turnkey solutions for plastic extrusion. Our diverse product portfolio includes:

• Pipe Production: Advanced lines for PE, PPR, PVC, and PVC-O pipes.
• Specialty Extrusion: High-efficiency corrugated and spiral pipe extrusion systems.
• Profiles / Strapping: PVC/WPC profile lines and PP/PET strapping tape production technology.
• Processing / Recycling: High-speed mixing units, as well as integrated granulation and washing systems.

At Kairun, we turn technical accumulation into industrial excellence, ensuring our clients receive robust and innovative machinery tailored to their production needs.

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