PU Sandwich Panel Production Line With Continuous PU Foaming Process

The pu sandwich panel production line with continuous pu foaming process is an efficient and automatic production equipment for composite panels, which is mainly used to manufacture sandwich structural panels composed of upper and lower metal panels (or non-metallic panels) and intermediate polyurethane foam cores. This production line is widely used in fields such as building insulation, cold storage construction, and industrial plants.

sandwich panel line

The main component system of the continuous foaming production line for polyurethane sandwich panels

• Raw material storage and transportation system
  Isocyanate (MDI) and polyol storage tanks: typically made of stainless steel and equipped with temperature control devices
  Accurate measurement system: high-precision gear pump or mass flow meter, with error controlled within ± 1%
  Automated conveying pipeline: Insulated pipeline ensures stable temperature of raw materials

• Panel pre-processing system
  Uncoiler: Dual station automatic switching ensures continuous production
  Cleaning and drying device: remove oil stains and impurities from the surface of the panel
  Preheating system: infrared or hot air heating to improve the adhesion between the panel and foam

• Continuous foaming molding system
  Double track molding machine: adjustable spacing between upper and lower tracks, uniform pressure
  Temperature control system: precise temperature control in zones, temperature range of 30-60 ℃
  Sealing device for foaming area: prevents material leakage and maintains stable foaming environment

• Cutting and Stacking System
  High speed flying saw: servo control, cutting accuracy ± 1mm
  Automatic stacker crane: robotic arm or vacuum suction cup type, programmable stacking mode

Production process flow of pu sandwich panel continuous foaming production line

• Panel preparation: After unwinding, cleaning, and preheating, the metal panel enters the forming section
  

• Raw material mixing: The high-pressure foaming machine mixes isocyanates and polyols in proportion
  

• Casting molding: The mixture is evenly poured onto the lower panel
  

• Foam curing: Complete the foaming reaction in the molding machine and bond it to the upper panel
  

• Maturation and shaping: The board is finally cured in a controlled environment
  

• Fixed length cutting: automatically cut according to the set length
  

• Finished product stacking: automatic stacking, ready for transportation

Technical advantages of continuous foaming production line for pu sandwich panels

• Efficient continuous production: Breaking through the limitations of traditional intermittent production and achieving 24-hour uninterrupted operation
  

• Energy saving and environmental protection: Closed mold foaming process, with a raw material utilization rate of over 99%
  

• Excellent product performance: high closed cell rate (≥ 95%), low thermal conductivity (≤ 0.022W/(m · K))
  

• High degree of automation: PLC centralized control reduces manual intervention
  

• Strong flexibility: can quickly switch between products of different thicknesses, widths, and panel materials

Key points for quality control of polyurethane sandwich panel continuous foaming production line

• Precision control of raw material ratio
  

• Temperature and humidity monitoring of foaming environment
  

• Uniformity testing of sheet thickness
  

• Observation of Bubble Structure with Microscope
  

• Adhesive strength test
  

• Dimensional stability monitoring

In addition to traditional building exterior walls and cold storage applications, the new generation pu sandwich panel continuous production line can also produce:

• Flame retardant board with a fire rating of B1 or above
  

• High density structural load-bearing board
  

• Decorative integrated composite board
  

• Weather resistant board for special environments

The continuous foaming production line of polyurethane sandwich panels represents the advanced level of polyurethane sandwich panel manufacturing, and with continuous technological innovation, it will play an important role in more fields.