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2+2 Discontinuous PU sandwich Panel Production Line
2+2 Discontinuous PU sandwich Panel Production Line (Batch PU Hot-Pressing Lamination Line) is a polyurethane sandwich panel production equipment adopting an alternating cycle operation mode with 2 stations for pressure holding & curing and 2 stations for loading/unloading & preparation. It is commonly referred to as the 2+2 hot press line in the industry, mainly for custom production of cold storage panels, PIR fire-retardant panels and special-specification polyurethane color steel sandwich panels.
Meaning of 2+2: It is equipped with 4 sets of movable mould worktables. Two worktables complete material injection, foaming and constant-temperature pressure holding & curing inside the press; the other two synchronously perform demoulding, panel unloading, color steel sheet laying and edge sealing preparation outside the press. The two groups of stations work in rotation to reduce idle waiting time of the press and greatly boost the productivity of the batch line compared with the 1+1 model.
Different from continuous production lines: The non-continuous line adopts closed mould injection foaming, with each panel formed independently. It is suitable for thick panels, large-size panels, special-shaped tongue-and-groove panels, small-batch and multi-specification orders. It is the mainstream choice for cold storage panel manufacturers and can also work with continuous lines to fulfill mixed orders
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Video Of 2+2 Discontinuous PU sandwich Panel Production Line
Applicable panels：
PU / PIR fire-retardant color steel sandwich panels. Face sheets can be galvanized color steel sheets, galvalume sheets, stainless steel sheets or aluminum sheets. Panel thickness ranges from 50 mm to 250 mm, standard width ≤1200 mm, and available lengths of 6 m / 9 m / 12 m (customizable on demand). Widely used in low-temperature cold storage, refrigerated truck bodies, cleanrooms, constant-temperature workshops and thermal insulation shelters.
Main Technical Parameters/Specifications of 2+2 Discontinuous PU sandwich Panel Production Line
Main Components of the Complete Line
1. Uncoiling, color steel forming and shearing system (pre-treatment of color steel face sheets, tongue-and-groove forming, fixed-length cutting)
2. Hydraulic hot press main unit (heavy-duty frame, hydraulic cylinders, constant-temperature heating platens, mould guide rails)
3. Four sets of movable mould worktables (equipped with sealing frames, tongue-and-groove stops, water-circulation constant temperature system)
4. High-pressure PU foaming metering system (compatible with polyol & isocyanate, cyclopentane / HFO eco-friendly blowing agents, closed-loop metering)
5. Mobile injection trolley / traversing mixing head
6. Temperature control system, hydraulic control system, PLC HMI system
7. Auxiliary units: vacuum panel lifting fixture, finished panel conveyor, trimming & packing station
Production Process
The whole line adopts a batch closed-loop cyclic process with four mould worktables operating in rotation:
1. Pre-treatment of color steel face sheets
Steel coil uncoiling → roll forming (ribbing and tongue-and-groove forming) → fixed-length cutting. Upper and lower color steel sheets are prepared. Surface cleaning and priming can be applied to improve adhesion.
2. Mould loading at external stations (2 external worktables work simultaneously)
The worktable moves out of the press. Lay the bottom sheet, install surrounding sealing frames and tongue-and-groove modules, place side baffles, lay the top color steel sheet, close and seal the mould, and take anti-leakage measures.
3. Worktable exchange into the press
The loaded worktable is pushed into the hydraulic hot press. Meanwhile, the fully cured worktable is moved out of the press for station exchange.
4. High-pressure injection and closed foaming
The traversing mixing head extends into the mould cavity. Polyol and isocyanate are metered precisely according to the formula, mixed under high pressure and injected into the cavity at a constant speed. PU raw materials foam and expand freely in the confined space to fill the entire panel cavity.
5. Constant-temperature pressure holding & curing (core process)
The hydraulic system clamps the mould and maintains pressure. Heating platens adopt water-circulation constant temperature control (temperature set by formula). Curing time is adjusted according to panel thickness (normally 8–15 min; thicker panels require longer curing time) to ensure foam maturation, strong bonding and no deformation.
6. Demoulding and panel unloading
After curing, the worktable moves out of the press. Operators open the mould frame with vacuum lifting tools and take out the finished PU color steel sandwich panel.
7. Post-processing, inspection and packing
Panels are cooled, trimmed and cleaned of flash. Random inspection on appearance, dimension and thickness is carried out. Qualified panels are stacked, film-wrapped and packed for storage.
8. Cycle
Empty worktables return to the preparation station for sheet laying and mould loading again to realize continuous cyclic operation.
Supplementary Supply Description
We can supply the 2+2 hot press main unit separately, or provide a complete turnkey solution including uncoiling & forming line, high-pressure foaming system, moulds, hydraulic system, electrical control system, lifting fixtures and conveyor line. Customization based on drawings, voltage adaptation, overseas installation guidance and formula commissioning are available.
Samples and Applications
- PU Panel
- Coolroom Panels
- Bandsaw cutting system
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