In a PU (polyurethane) sandwich panel machine, the double belt conveyor system is crucial for shaping and curing the panels. It acts as a continuous press, ensuring uniform thickness and strong bonding between the top and bottom steel sheets with the PU foam in between. The system maintains stable pressure and temperature during the PU foam's expansion and curing process, resulting in high-quality, structurally sound panels.

Here's a more detailed breakdown:

1. Core Function:

The double belt conveyor system is essentially a continuous press that conveys the steel sheets with the injected PU foam through the machine.

It applies controlled pressure and maintains a consistent temperature to facilitate the foam's expansion and curing.

The synchronization of the upper and lower belts is vital for achieving uniform panel thickness and surface flatness.

2. Components and Mechanism:

The system typically consists of two endless belts (upper and lower) that move in synchronization.

It may include a slat chain system for added stability and to prevent distortion or scratching of the panel surface.

Hydraulic systems are often used to adjust the panel thickness and maintain pressure during the process.

Heating systems may be integrated to control the curing temperature of the PU foam.

3. Importance for Quality:

The double belt conveyor ensures that the PU foam expands and cures evenly, resulting in panels with consistent thickness and excellent bonding between the steel sheets and the foam.

The system's ability to maintain stable pressure and temperature is critical for achieving the desired structural integrity and surface flatness of the final sandwich panels.

The flatness of the conveyor's slats is also a key factor in preventing panel distortion and ensuring a smooth surface finish.

4. Continuous Production:

In a continuous production line, the double belt conveyor system plays a central role in the overall process, moving the panels from the PU foaming area to the cutting section.

The speed of the conveyor is often a determining factor in the overall production speed of the sandwich panel line.

The ability to adjust panel thickness through the conveyor's hydraulic system allows for the production of panels of various thicknesses on the same line

Features:

Main machine for the production of PUF panels (conversion of liquid chemical in to solid foam)

It consists of two heavy duty independent conveyor structure (upper and lower) and supported by columns which are placed on the floor.

The lower structure is fixed and the upper structure can be adjusted through the electrical controlling hydraulic jack.

Panel thickness is adjusted by stable hydraulic system; ensure production precise. It is very convenient to adjust the different height to suit for different panel thickness.

It is driven by gear box controlled by motor and inverter. The speed can be adjusted.

On both the side surface of the lower conveyor structure, there will be a mould carried by chain system which is also rotated along with the conveyor. Mould size may vary according to the panel thickness.