PU Sandwich Panel Line With Edge Trimming And Hole Punching Functions

The continuous polyurethane sandwich panel production line is a highly automated composite material production system designed specifically for manufacturing building panels with excellent thermal and sound insulation properties. This production line integrates multiple functions such as raw material processing, foam molding, composite pressing, edge trimming and precise punching, and can continuously produce high-quality polyurethane sandwich panels.

sandwich panel line

Compared with traditional sandwich panel production lines, pu sandwich panel lines with trimming and punching functions represent the latest development direction of industry technology. This intelligent production line not only improves production efficiency (up to 15-25 meters/minute) and reduces manual intervention (reducing labor demand by more than 60%), but more importantly, by integrating trimming and punching units, it realizes the production concept of "offline as finished product", greatly shortening the subsequent processing cycle and providing a more efficient and accurate solution for the construction industry.

Core components of the automatic pu sandwich panel production line

• Raw material pretreatment system
  The starting point of the polyurethane sandwich panel production line is the raw material pretreatment system, which consists of multiple precision units. Metal coils (usually color steel plates, stainless steel plates, or aluminum plates) are first unfolded by an automatic unwinding machine, and then enter a cleaning unit where high-pressure ion air combined with electrostatic precipitator technology is used to remove surface impurities. Next is the leveling machine, which uses multiple sets of roller wheels to precisely straighten the metal surface material, with a flatness error controlled within 0.1mm/m. The final step of the pre-treatment system is the adhesive unit, which uses two-component polyurethane special adhesive. The adhesive is evenly applied through a high-precision spraying system, and the thickness of the adhesive layer is controlled at 50-80 μ m to prepare for subsequent foaming bonding.

• Polyurethane foaming and composite system
  The foaming system is the core link of the production line, which uses advanced high-pressure foaming machines (usually with a working pressure of 120-150 bar) to mix and inject polyurethane raw materials (isocyanates and polyols) in precise proportions. The system is equipped with a temperature closed-loop control unit (control accuracy ± 0.5 ℃) and a flow metering system (accuracy up to ± 0.3%) to ensure stable foaming process. The composite area adopts a dual belt press design, with an upper and lower pressure of up to 50-80 tons. Through precise temperature gradient control (three temperature zones of 50 ℃ -80 ℃ -110 ℃), the polyurethane is fully reacted and cured, while forming a strong bond with the metal panel. The foaming density can be adjusted between 30-60kg/m ³ according to product requirements, and the curing time is precisely controlled by the conveyor belt speed.

• Integrated edge trimming system
  The modern edge trimming system adopts fully automatic numerical control technology, mainly composed of the following parts:
  High rigidity frame: Made of cast iron structure, excellent shock absorption performance
  Multi axis linked cutting unit: equipped with 3-5 sets of diamond coated cutting tools, with a speed of 6000-8000rpm
  Laser positioning system: positioning accuracy ± 0.1mm
  Waste edge recycling device: automatic collection and crushing of cutting waste materials
  
  The trimming system can achieve four working modes:
  Right angle trimming: Standard mode, with edge perpendicularity reaching 89.5 ° -90.5 °
  Chamfering and trimming: adjustable angle range of 30 ° -60 °
  Step trimming: can form a waterproof step structure
  Heterosexual trimming: Cutting complex contours according to drawings
  During the operation, the sheet is positioned by laser scanning, and the CNC system automatically calculates the optimal cutting path. The tool pressure is automatically adjusted according to the thickness of the sheet (50-200N adjustable), and the cutting speed can reach 20m/min. The dust removal system adopts a combination of dry and wet methods to ensure a clean working environment.

• Intelligent punching system
  The CNC punching unit is a key innovation point in the polyurethane sandwich panel production line, with the following technical characteristics:
  Adopting modular design, 4-16 workstations can be configured according to product requirements
  Equipped with servo motor drive, with a positioning repeatability accuracy of ± 0.05mm
  Spindle speed 3000-15000rpm infinitely adjustable
  Maximum drilling capacity: Metal surface layer 10mm, overall plate thickness 150mm
  
  The punching system supports multiple processing modes:
  Standard circular hole: diameter range of Φ 3- Φ 50mm
  Round hole: maximum 50 × 15mm
  Square hole: maximum 30 × 30mm
  Irregular hole: achieved through special cutting tools
  The intelligent recognition system can automatically detect the position and thickness of the board, and adjust the drilling parameters (speed, feed rate). The dust removal device integrates high-pressure air blowing and vacuum adsorption to ensure the smoothness of the hole wall Ra ≤ 3.2 μ m. The tool changing system can complete automatic tool changing within 15 seconds, adapting to different aperture requirements.

• Automated control system
  The polyurethane sandwich panel production line adopts a distributed control system architecture, mainly including:
  Central console: Industrial PC+PLC combination, running dedicated control software
  Human computer interface: 15-21 inch touch screen, supporting 3D simulation display
  Data collection: 100+sensors for real-time monitoring of process parameters
  
  The control system has the following intelligent functions:
  Adaptive adjustment: Automatically adjust foaming parameters based on environmental temperature and humidity
  Quality prediction: Predicting product defects through machine learning algorithms
  Energy optimization: dynamically adjusting equipment power consumption
  Remote maintenance: supports 4G/5G network remote diagnosis

Application Fields

The polyurethane sandwich panel line with integrated trimming and punching function is widely used in:

• Construction field: cleanrooms (pharmaceuticals, electronics), cold storage (-40 ℃ to+60 ℃), sports venues (large-span structures)
  

• Industrial fields: ship cabins (lightweight partitions), vehicle interiors (rail transit), container houses (quick loading structures)

The pu sandwich panel manufacturing line with integrated trimming and punching functions will continue to develop towards high efficiency, high precision, high automation, and green environmental protection, providing a more comprehensive solution for the construction manufacturing industry. This technology not only improves product quality and production efficiency, but also promotes the value upgrade of the entire industry chain through process innovation.