PU Foam Sandwich Panel Machine

The pu foam sandwich panel machine is an efficient and automatic industrial equipment system, which is specially used to produce composite panels composed of two layers of metal panels (or panels made of other materials) and polyurethane foam core in the middle. The polyurethane sandwich panel production line integrates technologies from multiple fields such as mechanical, chemical, electrical, and automation control, enabling continuous production from raw materials to finished products.

sandwich panel machine

PU foam sandwich panel production lines usually have the following significant characteristics: high degree of automation, strong continuous production capacity, stable product quality, and energy conservation and environmental protection. According to production scale and technological level, production lines can be divided into small semi-automatic lines, medium-sized automatic lines, and large fully automatic lines.

Core equipment composition of pu foam sandwich panel machine

• Panel pre-processing system
  Panel pretreatment is the first critical process to ensure product quality, and modern production lines are typically equipped with:
  Fully automatic unwinding machine: using hydraulic tensioning technology, it can process metal coils with a thickness of 0.3-1.2mm and a maximum roll weight of 10 tons
  Precision leveling machine: 7-13 roller structure, with a flatness of up to 0.5mm/m
  Online cleaning device: Three tank alkaline degreasing system, combined with high-pressure spray (pressure 0.3-0.5MPa)
  Drying system: Hot air circulation drying, temperature controllable within 80-120 ℃± 5 ℃
  Film laminating machine: optional, used for surface protective film bonding, with an accuracy of ± 1mm

• Forming unit
  The panel forming directly affects the appearance and strength of the final product:
  Rolling forming machine: 12-24 sets of rolling mill units, driven by servo motors, with synchronous forming speed accuracy of ± 0.5%
  Quick mold changing system: hydraulic clamping, mold changing time<30 minutes
  Edge bending machine: used to form male and female connection structures, with an angle accuracy of ± 0.5 °
  Online detection system: laser rangefinder for real-time monitoring of forming size deviation

• Polyurethane foaming system
  The foaming system is the core technology part of the production line:
  High pressure foaming machine: working pressure 120-200 bar, flow control accuracy ± 1.5%
  Temperature control system: raw material temperature control accuracy ± 1 ℃, using plate heat exchangers
  Mixing head: self-cleaning, mixing efficiency>98%, lifespan of over 500000 times
  Measurement system: Mass flowmeter with servo motor, proportioning accuracy ± 1%
  Foam platform: double track type, adjustable pressure of 0.05-0.3MPa, temperature control of 30-60 ℃

• Composite pressurization system
  Ensure a strong bond between the core material and the panel:
  Double belt press: adjustable pressure range of 5-30 tons, heating temperature of 40-80 ℃
  Hot air circulation system: adjustable wind speed of 0.5-2m/s, temperature control accuracy of ± 3 ℃
  Pressure balancing device: multi airbag zone control, pressure deviation<5%
  Online monitoring: Real time monitoring of composite interface temperature using infrared thermometer

• Cutting and Stacking System
  Complete the fixed length cutting and post-processing of the product:
  Flying saw cutting machine: servo drive, cutting accuracy ± 1mm, angle deviation<0.5 °
  Automatic deburring: rotating wire brush deburring device
  Stacking robot: maximum load of 300kg, positioning accuracy ± 0.5mm
  Packaging machine: automatic winding packaging, adjustable tension of 10-50N

Production process flow

• Panel pre-processing stage (accuracy requirement: ± 0.1mm)
  Uncoiling → Leveling (elongation<0.2%) → Cleaning (cleanliness up to ST3 level) → Drying (moisture<0.5%) → Coating (if necessary)

• Molding stage (speed: 5-15m/min)
  Progressive forming through multiple rolling rolls (forming force 20-50 tons)
  Edge treatment (bending angle 90 °± 0.5 °)
  Online detection of molding dimensions (sampling frequency 100Hz)

• Foam composite stage (key parameter control)
  Preheating of raw materials (polyether polyol 20-25 ℃, isocyanate 25-30 ℃)
  High pressure mixing (pressure 150 ± 5 bar, mixing time<0.1 s)
  Pouring volume control (error ± 3%)
  Foam time adjustment (30-120 seconds adjustable)

• Maturation and shaping (temperature control)
  Initial curing zone (40-50 ℃, 1-2 minutes)
  Final curing zone (60-80 ℃, 3-5 minutes)
  Cooling zone (forced air cooling to below 35 ℃)

• Post processing stage
  High speed cutting (cutting speed 2-4m/s)
  Automatic stacking (each stack height can be set to 1.2-1.8m)
  Packaging protection (PE film thickness 0.05-0.08mm)

Selection considerations

• Production demand: Choose line speed (3-15m/min) based on annual output
  

• Product specifications: Maximum board width can reach 1200mm, thickness 30-200mm
  

• Automation level: from semi-automatic to fully automatic (reducing manual labor by 40-70%)
  

• Energy consumption index: Advanced line energy consumption<35kWh/㎡

The products produced by pu foam sandwich panel machines are widely used in:

• Construction field: cold storage, factory buildings, clean rooms
  

• Transportation field: carriage board (thermal conductivity<0.025W/mK)
  

• Home appliance industry: Insulated enclosure (density 35-45kg/m ³)  

With the increasing demand for green buildings, pu foam sandwich panel machines are developing towards greater efficiency, intelligence, and environmental friendliness. The new sandwich panel production line will integrate IoT technology, achieve full traceability of production data, and adopt modular design to meet the needs of multi variety and small batch production.