The Characteristics and Manufacturing Process of PU Sandwich Panel Production Line

A continuous PU sandwich panel production line, also known as a polyurethane sandwich panel production line/machine, is an automated production line consisting of unwinding machines, laminating, pre-cutting, cutting equipment, forming systems, pre-heating, foaming, curing, saw cutting, cooling, stacking, and packaging. The entire PU sandwich panel production line integrates mechanics, chemistry, electrical control, hydraulic and pneumatic, and temperature control technologies.

Characteristics of the PU Sandwich Panel Production Line

• It is beautiful and practical, and has multiple functions such as insulation, sound insulation, and flame retardant.

• It adopts a hot air circulation oven to strictly control the PU foaming curing temperature within a suitable range.

• It uses a high-pressure foaming system with precise metering, high stability, less on-site dust, and protection of workers' health.
  

• It uses 141B or pentane as a foaming agent instead of chloroform carbon, making PU foaming treatment an environmentally friendly production process.
  

• It has a special double-belt conveyor, with a flat and uniform surface on the sandwich panel, preventing any patterns.
  

• The operation system uses PLC computer control with a user-friendly design, making the operation simple.
  

Manufacturing Process of the PU Sandwich Panel Production Line

Unwinding System

Horizontal positioning of the unwinding machine - outer movement of the elevator - lifting of the coil - inner movement of the elevator - lifting of the elevator - moving wheel of the elevator to the inner position - unwinding of the unwinding machine shaft (-pressing arm pressing) - lifting table reset position - unwinding of the unwinding machine material.

Cutting System

Plastic film is applied to the surface of the panel. The pre-cutting knife is used to cut the single-layer skin panel when it needs to change to another type of profile.

Rolling Forming System

There is one upper profile rolling forming machine, namely, a double-headed profile rolling forming machine. The upper roll forming machine consists of two sets of forming rolls, one set of guiding systems, one set of transmission systems, and one set of frames.

Rock Wool System

The rock wool system consists of rock wool lifting device, rock wool longitudinal shear device, rock wool flipping device, upper and lower foam injection system, two-component side seal foaming machine, dust collection device, and conveyor, etc.

Pre-Heating

Oven preheating - temperature adjustment - board forward - send the board into the oven - guide wheel driven - measure the panel temperature - send the panel out of the oven.

Foaming Accessories

Foaming system accessories include sheet transfer conveyor, tape sealing device, and sponge sealing device.

Double Belt System

The DBL is mainly used to overcome the expansion of foaming to make it solidify and determine the thickness and production speed of the panel. The sideband overcomes the lateral expansion, determines the width of the panel, and guides it towards the panel.

Saw Cutting System

• Motor power: 5.5kw;

• Cut length: 2m (according to production speed changes);

• Mobile motor power: 1.5kw;

• Maximum panel thickness: up to 250mm;

• Cutting distance: up to 1200mm;

• Total power: 20 kW.

Cooling System

The cooling system consists of front and rear conveyors, two sets of lifting belt conveyors, cooling processing conveyor, and electrical system.

Stacking System

The front conveyor belt is equipped with a sensor, which can stack two panels at the same time if the length is less than 7.5m. If the length exceeds 7.5m, one panel can be stacked.

Packaging System

The packaging system mainly consists of conveyor rollers and packaging machines. The packaging device of the packaging machine is driven by a deceleration motor and adopts a gear and rack transmission structure to rotate quickly, covering the product surface with a film.

Electrical Control System

The electrical system is included in the machine.