Plastic Haul-Off Machine: Ensuring Stable Tension and Speed Control in Extrusion Lines

Plastic haul-off machines (pullers) grip and pull extruded profiles, pipes, or cables at a controlled speed, ensuring consistent product dimensions and alignment in continuous production lines.

What is a Plastic Haul-Off Machine?

It uses belts, caterpillar tracks, or rollers to apply tension to extruded products, synchronizing with the extruder’s output speed to prevent warping or stretching.

Types of Haul-Off Systems

1. Caterpillar Haul-Offs:
   • Grip heavy profiles (e.g., PVC pipes) with rubber tracks.
2. Belt Pullers:
   • For delicate products like medical tubing or optical fibers.
3. Roller Haul-Offs:
   • Adjustable rollers for flat sheets or films.
4. Capstan Pullers:
   • Wrap cables around a rotating drum for high-tension applications.

Core Advantages

• Dimensional Accuracy: Maintain uniform wall thickness and diameter.
• Speed Synchronization: Match extruder output (0.1–50 m/min).
• Versatility: Handle rigid PVC, soft TPE, or reinforced hoses.

Applications

• Pipe Extrusion: Pull HDPE gas pipes at 10–20 m/min.
• Wire & Cable: Control tension during insulation coating.
• Profile Extrusion: Aluminium-plastic window frames.

Operation Guidelines

1. Speed Calibration: Set puller speed to 1–5% faster than extruder output.
2. Grip Adjustment: Modify track pressure based on product hardness.
3. Lubrication: Apply silicone spray to caterpillar tracks weekly.
4. Alignment Check: Ensure puller is centered with the extruder die.

Technological Advances

• Servo Motor Control: Auto-adjust speed via extruder torque feedback.
• Non-Slip Surfaces: Laser-etched tracks for slippery materials like PTFE.