A PU sandwich panel line machine is a highly automated, continuous production line designed to manufacture sandwich panels. These panels are composite materials consisting of three layers: a low-density core (like PIR, PU, or mineral wool) sandwiched between two thin, rigid metal skins (typically steel or aluminum).
The machine takes in the raw materials and in a continuous, in-line process, it forms the metal, mixes and injects the foam, cures the panel, cuts it to length, and outputs a finished product. The entire process is controlled by a central PLC (Programmable Logic Controller) for precision and efficiency.
Main Components
| Decoiler | Holds and feeds steel coils smoothly into the line |
| Leveling System | Ensures flat, uniform material before forming |
| PU Sandwich Panel Line Unit | Precision-engineered rollers shape steel into into different profiles with accuracy |
| Punching | The flat strip passes through the pre-punching station, where holes/slots are stamped out at precise intervals |
| Hydraulic Cutting System | Provides fast, clean, and burr-free cuts to required lengths |
| Control System (PLC + Touch Screen) | User-friendly interface for automatic operation and easy adjustments |
| Output Table | Collects finished products for efficient handling and packaging |
Key Features
- Fully Automated Operation: From decoiling the metal to cutting the final panel, the process is automated, ensuring consistent quality and reducing labor costs.
- PLC Control System: A central computer allows for precise control over all parameters (speed, temperature, pressure, length) and stores recipes for different panel types and thicknesses.
- Continuous Foaming & Laminating: The core mixed liquid is injected and foams in a controlled environment between the already-formed metal skins, creating a perfect, continuous bond with no gaps (cold bridges).
- Double Web (Sheet) Feeding: Capable of handling two separate coils for the top and bottom skin, allowing for different colors, materials, or coatings on each side.
- Precision Roll Forming Stations: A series of forming rollers gradually shape the flat metal sheets into their final profile (e.g., trapezoidal, micro-rib, flat) without damaging the protective coating.
- Synchronized Flying Cut-Off Saw: The cutting mechanism moves with the continuous panel to make a clean, square cut without stopping the production line, maximizing output.
- Panel Thickness Adjustment: The PU sandwich panel line machine can quickly adjust the distance between the top and bottom forming lines to produce panels of varying thicknesses (e.g., from 30mm to 200mm).
- High Production Speed: Depending on the model and panel thickness, these machines can produce between 5 to 15 meters of panel per minute.
- Safety Systems: Includes emergency stops, safety guards, and gas detection systems for the foaming chemicals.
Technical Specifications
| Material | Type | CRS, GI, PPGI |
| Thickness(mm) | 0.3-1.2 | |
| Yield Strength(Mpa) | 230-350 | |
| Forming Speed(m/min) | 15-45(customized) | |
| Roller Station | Depends | |
| Roller Material | 45# steel with hard chrome treatment | |
| Roller Driven Type | Chain transmission/Gearbox | |
| Shaft Material | 45# steel with heat treatment | |
| Shaft Diameter | Ø75 mm | |
| Control System | PLC+Touch screen and button | |
| Main Machine Power(KW) | 15 | |
| Hydraulic station Power(KW) | 4 | |
| Machine Weight(Kg) | 7000 | |
| Machine size(m) | 8.5×1.8×1.9 Depend on final design | |
Machine Video
Applications
Cold Storage & Food Processing
The PU sandwich panel lines produced by this line are the industry standard for refrigerated warehouses, cold rooms, and food processing plants. Their superior thermal insulation properties (especially PIR/PU cores) maintain stable internal temperatures, reducing energy costs and ensuring food safety.
Industrial & Commercial Facilities
These PU sandwich panel line serve as high-performance external walls and roofing systems for large-scale structures such as factories, logistics centers, and workshops. They offer rapid installation, excellent structural strength, and durable weather protection for industrial environments.
Clean Room Environments
Designed to meet strict hygiene standards, the panels are essential for hospitals, pharmaceutical labs, and electronics manufacturing. The smooth, dust-free surfaces are easy to clean and resist bacterial growth, creating a controlled environment critical for sensitive operations.
Prefabricated & Modular Construction
The machine caters to the growing demand for office buildings, temporary housing, and modular units. The lightweight yet strong panels function effectively as partition walls and insulated facades, enabling fast, cost-effective, and aesthetically pleasing construction.
Specialised Agricultural Applications
Beyond standard roofing, these insulated panels are widely used in agricultural storage, mushroom farms, and livestock shelters. They provide a controlled climate that protects crops and animals from external temperature fluctuations and harsh weather conditions.
