pu sandwich panel production line
Ongoing and discontinuous panel manufacturing approaches
In excess of the final 50 a long time, sandwich panels have advanced as a notably affordable means of development. The merged materials are often two pores and skin layers (rigid steel dealing with substance or versatile skins these kinds of as slender aluminum, paper or membranes, based on the software) and a main insulating materials.
There are fundamentally two panel manufacturing technologies: steady and discontinuous. In the steady method, all the utilised materials are processed together, and the fully shaped panel is minimize to the desired length without having halting the line. In the discontinuous approach, the materials are processed individually this indicates the facings are formed and minimize to the desired length and then assembled collectively in a press the place the foam is injected.
The discontinuous procedure has a reduced level of productivity that can't be when compared with that of the ongoing a single. It is employed these days for goods with styles that do not allow the steady method, or when the creation fee necessary does not justify investment in a ongoing line.
A continuous line has an common pace of about fourteen meters per moment in production of medium panel thickness (forty-50 mm) with steel facings. With one eight-hour shift a day in excess of 220 days in a year, creation quantities to about 1,one hundred eighty,000 meters for each year, assuming an effectiveness of 80 %. A discontinuous line with a double push twelve meters prolonged, under the exact same circumstances, can achieve manufacturing of about one hundred,000 meters per yr when functioning 1 shift for each working day.
Constant panel creation line
A common steady line is manufactured up of the subsequent a few sections:
• exterior levels processing segment
• insulating materials processing part
• panels dealing with area
In a standard scenario of a sandwich panel with both exterior surfaces in sheet metallic and an insulating core in polyurethane rigid foam, the first section commences with the sheet decoilers and continues with all the gear for forming the two sheets into the desired shape. The panel could be a panel for walls or for roofs. Sandwich panels with flexible layers (aluminum, glass fiber sheets, asphalt paper) are not rollformed. Both surfaces of the ultimate panels are entirely flat. The surfaces are pre-heated to the temperature required by the process (generally amongst forty and sixty five C) and then the insulating material is geared up.
In the case of polyurethane (PU-PIR) panels, the foam is generated by starting from the essential chemical factors metered and combined with each other in the foaming machine. The ensuing liquid mixture is evenly dispersed more than the decrease steel sheet. The metallic facings, foam and possible facet strips or gaskets are pressed inside the double conveyor or steady press. This device has to keep the metallic sheets divided at the preferred length even though the foam expands.
In this way, the panel will have the wanted thickness and form when the foam has expanded and totally fixed. The most critical parameter to make sure a very good result from the procedure is the temperature control of the chemical factors, metal sheets and push location. If the insulating substance is mineral wool or expanded polystyrene, it is inserted and glued to the steel sheets in the sort of mattresses that have been lower and shaped to the appropriate thickness prior to insertion.
Temperature is yet again a critical parameter, this time for the response of the glue, i.e. for good adhesion of the inner board to the exterior levels. Following being shaped, the panel is cut, cooled, stacked and wrapped with a plastic film. These previous operations can be carried out immediately or manually, dependent upon the automation amount that the buyer calls for for their production line.