PVC pipe extrusion line

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Product details

SJ92/188 PVC Pipe Conical Twin-Screw Extrusion Line

1. SJ92/188 Tapered Twin-Screw Extruder :

2. Pipe Die Head:

- Spider-Type or Spiral Mandrel Design: Designed for optimal melt distribution and minimal weld lines. Spiral manddels are common for high-quality pipe, ensuring uniform wall thickness.
- Precision Sizing: Critical for achieving the target pipe outer diameter (OD) tolerance immediately after extrusion.
- Multi-Zone Temperature Control: Independent heating zones on die body, mandrel, and die lips ensure precise melt temperature management at the exit point for smooth surface finish.
- Streamlined Flow Path: Minimizes stagnation areas where PVC could degrade over time.
- Robust Construction: Handles the high pressure and temperature of the PVC melt from the powerful extruder.

3. Vacuum Calibration Sizing Tank:

- Vacuum Sizing Sleeves: Precise, water-cooled sleeves that pull the molten pipe OD against their internal surface using vacuum, defining the final external dimensions and roundness.
- Efficient Cooling: Direct contact with cooled water inside the tank rapidly sets the pipe's external dimensions.
- Adjustability: Sizing sleeves are precisely adjustable to accommodate different pipe diameters and ensure concentricity.
- Level Control: Critical to maintain consistent pipe position within the sleeves. Often uses floating plugs or level sensors.

4. Spray Cooling Tank:

- Secondary Cooling Stage: Follows the calibration tank to further cool the pipe wall internally and externally to near ambient temperature throughout its thickness.
- Internal Mandrel Cooling : Uses cooled air or water mist circulated through the pipe's core via the calibrator mandrel extension.
- External Spray Rings: Multiple rings with fine nozzles spray cooling water evenly onto the pipe surface.
- Gradual Temperature Reduction: Zoned cooling prevents thermal stress and warpage in the rigid PVC.
- Sufficient Length: Designed to handle the high line speeds enabled by the SJ92/188 extruder, ensuring complete cooling before cutting.

5. Haul-Off :

- High Grip & Constant Speed: Caterpillar-type pullers with multiple synchronized rubber or polyurethane belts/clamps. Provides the necessary traction to pull the pipe at a constant speed against the extruder's output pressure and through the calibrator/cooling tanks.
- Precise Speed Control: Crucial for maintaining consistent wall thickness and diameter. Speed is synchronized with the extruder screw speed.
- Robust Drive System: Handles the significant pulling force required for large-diameter or thick-walled pipes produced at high rates.
- Adjustable Grip Pressure: To accommodate different pipe sizes without deformation.

6. Cutting Unit (Saw):

- Flying Saw (Reciprocating or Circular): Moves synchronously with the pipe during the cut, allowing continuous downstream pulling.
- Programmable Length Control: Precise cutting to pre-set pipe lengths (e.g., 4m, 6m).
- Clean, Burr-Free Cuts: Sharp blades and optimized cutting speed/feed ensure square, smooth ends suitable for socket welding or belling.
- Dust Extraction: Integrated system to remove PVC cutting dust for operator safety and cleanliness.

7. Pipe Stacker:

- Automatic Handling: Receives cut pipes from the saw discharge.
- Gentle Transfer: Equipped with pneumatic stainless steel turning table.