Plastic Profile Production Line 

A plastic profile production line is a continuous extrusion system that converts thermoplastic raw materials (most commonly PVC, but also PE, PP, WPC or other compounds) into long, constant-cross-section profiles used in construction, furniture, automotive trim, appliance housings and many other industries . The process is called profile extrusion and, compared with injection moulding or machining, offers high productivity, low unit cost and almost unlimited profile length.

Typical workflow

1. Material preparation  

  PVC powder or pellets (often pre-mixed with CaCO₃, stabilisers, impact modifiers, colourants, wood-fibre in the case of WPC, etc.) are fed into a high-speed heating/cooling mixer to obtain a homogeneous, dry blend .

2. Extrusion  

  The blend is charged into the hopper of a conical twin-screw extruder (for rigid PVC) or a single-/parallel-twin-screw machine (for PE/PP). Inside the barrel the material is melted, compressed and degassed before being forced through a specially designed die that gives the melt its final shape .

3. Calibration & cooling  

  Immediately after leaving the die, the hot profile enters a vacuum calibration table where it is drawn against precision brass calibrators by vacuum pumps while simultaneously being cooled by a powerful water circuit. Correct sizing and rapid heat removal are critical for tight tolerances and minimal warpage .

4. Haul-off  

  A caterpillar-type haul-off unit grips the cooled profile with rubber pads or belts and pulls it at a precisely controlled, synchronised speed. Constant tension prevents stretching or buckling and guarantees uniform wall-thickness .

5. Cutting & finishing  

  A flying cut-off saw or guillotine travelling at line speed cuts the profile to length. Cut ends are then brushed, chamfered or milled if required. A protective film can be applied on-line before stacking .

6. Stacking & packaging  

  Finished pieces are conveyed to an automatic stacker, bundled and strapped for shipment or downstream fabrication (drilling, welding, lamination, etc.).

Standard line configuration

• Conical twin-screw extruder (e.g. SJZ-55/110 up to SJZ-92/188)  

• High-quality die head, calibrator and cooling tank (length 4–11.5 m)  

• Frequency-controlled haul-off (2-, 4- or 6-belt caterpillar)  

• Servo-driven travelling saw with dust collection  

• PLC/SCADA control system (Siemens/Schneider/ABB)  

• Optional add-ons: ink-jet printer, embossing station, hot-stamp foiler, co-extrusion layer, laser marking, 4-side wrapping line .

Key advantages

• High output (180–500 kg h⁻¹ on high-speed models)  

• Excellent dimensional accuracy (±0.1 mm)  

• Modular design allows quick change-over between different profiles by swapping dies and calibrators  

• CE/ISO certified components, low energy consumption, 12-month warranty and worldwide service support .

Typical products

PVC window & door frames, sills, skirting boards, cable trunking, decorative trim, WPC decking, garden fencing, automotive sealing strips, refrigerator gaskets and many customer-specific profiles .