Polyurethane Sandwich Panel Continuous Production Line

The continuous production line for polyurethane sandwich panels is a highly automated and integrated industrial equipment designed specifically for producing high-performance building enclosure materials - polyurethane sandwich panels.

sandwich panel line

The polyurethane sandwich panel continuous production line uses precision controlled multiple processes to composite metal panels (such as galvanized color steel plates) with polyurethane rigid foam core materials, forming composite panels with multiple functions such as insulation, fire resistance, waterproofing, and load-bearing.

Process Flow

• Pre treatment of metal panels
  Uncoiling and leveling: The steel coil is unfolded by an uncoiler and straightened by a straightening machine to eliminate curling stress and ensure the flatness of the plate.
  Surface coating/reinforcement: Some production lines will cover the surface of the panel with protective film or press out reinforcing ribs to improve the compressive strength and aesthetic appearance of the finished product.
  Preheating: The metal plate enters the preheating zone (usually using infrared heating) to optimize the subsequent foaming and bonding effect.
  

• Polyurethane Foam and Composite
  High pressure casting: Polyurethane raw materials (isocyanates and polyols) are mixed through a high-pressure foaming machine and accurately sprayed or cast onto the lower panel.
  Laminated molding: The upper panel and foam core material are pressure compounded in a double track laminating machine to form a "metal polyurethane metal" sandwich structure.
  Continuous curing: The board undergoes a chemical reaction in the constant temperature curing zone to ensure uniform density and bonding strength of the core material.
  

• Post processing and cutting
  Fixed length sawing: The servo controlled follow-up saw cuts accurately according to the set length.
  Milling/edging: Some high-end production lines have added edge treatment processes to improve installation sealing.
  Automatic palletizing: Finished products are classified and stacked by stacker cranes, reducing manual intervention.

Key equipment composition

• Raw material processing system: High pressure foaming machine, supporting automatic temperature and ratio adjustment.
  

• Forming equipment: double-layer roll forming machine (can quickly change molds), double track laminating machine (adjustable pressure, suitable for different plate thicknesses).
  

• Control system: an automation system that integrates monitoring of temperature, pressure, speed, and other parameters to achieve a cutting accuracy of ± 1mm.

Technical features and advantages

• Efficient and energy-saving, with fast continuous production speed.
  

• Closed cell polyurethane core material has a low thermal conductivity, far exceeding traditional insulation materials.
  

• Flexible customization, supporting multiple board types (flat, corrugated, tongue and groove) and thicknesses, suitable for roof, wall, cold storage and other scene needs.

PU sandwich panels are widely used in industrial plants, cold chain logistics, clean workshops, and other fields.