PU Sandwich Panel Production Line

Polyurethane sandwich panel as an efficient and energy-saving building material, are widely used in industrial plants, cold storage, purification workshops and other fields. The pu sandwich panel production line is an automated production system that integrates mechanical, electrical, and chemical processes. It is mainly used for continuous production of composite panels with polyurethane as the core material and metal sheets as the surface layer.

sandwich panel line

The pu sandwich panel production line usually has the following characteristics:

• High degree of automation: adopting PLC control system to achieve fully automated production from feeding to finished product packaging
  

• Excellent production efficiency: The continuous production line speed can reach 10-15 meters per minute, and the daily production can reach 5000-8000 square meters
  

• Stable product quality: Accurate temperature control system and measuring device ensure consistent product performance
  

• Environmental protection and energy-saving design: equipped with exhaust gas recovery system and thermal energy reuse device

The length of the pu sandwich panel production line is generally between 80-120 meters. Depending on the configuration, it occupies an area of about 2000-3500 square meters and requires 15-25 operators to work in three shifts.

Core process flow of pu sandwich panel production line

Metal panel pretreatment section

• The metal panel (usually color steel plate or stainless steel plate) first enters the pre-treatment area:
  

• Uncoiling system: Dual station unwinding machine for non-stop roll changing, equipped with automatic correction device
  

• Cleaning process: Remove surface oil stains with alkaline cleaning solution, wash with water, and then dry
  

• Film protection: Some high-end products require a protective film to cover the surface
  

• Forming processing: Forming into the desired board shape (such as corrugated, flat, etc.) through multiple passes of roller pressing

Polyurethane foam injection molding section

• This is the core part of the production line, mainly including:
  

• Raw material system: Isocyanate (black material) and polyol (white material) storage tanks, typically with a capacity of 20-50 tons
  

• High pressure foaming machine: The working pressure is usually between 120-200 bar, and the mixing head adopts a self-cleaning design
  

• Double track laminating machine: adjustable spacing between upper and lower tracks (30-200mm), temperature controlled at 40-60 ℃
  

• Foaming area: approximately 15-25 meters in length, with temperature zoning control (25-50 ℃)

Post processing and cutting section

• The formed sheet enters the post-processing stage:
  

• Maturation area: keep the temperature at 30-45 ℃ for 10-15 minutes to make the foam completely solidified
  

• Automatic trimming: Rotating cutting tools accurately trim excess material on both sides
  

• Length cutting: servo controlled flying saw system, cutting accuracy ± 1mm
  

• Stacking and packing: automatic counting and stacking, usually 20-50 pieces per pack

The pu sandwich panel production line is developing towards higher efficiency, intelligence, and environmental friendliness. With the increasing demand for building energy efficiency and the promotion of prefabricated buildings, the polyurethane sandwich panel market will continue to grow. Understanding the technical details and latest developments of the production line helps enterprises make correct investment decisions and technology upgrade plans, and maintain a competitive advantage in the market.