Non-crosslinked polyethylene foam is created according to the technology of using an inert gas (most often propane-butane with additives), thanks to which foamed polyethylene is formed – the material adopts a closed-cell structure. Such a form is pressed into a sleeve and then cut and rolled onto a roller. This is how polyethylene foam in rolls is made.
On the other hand, cross-linked polyethylene foam is produced in a completely different technological process. First, a mass of PE granules is prepared, which is enriched with the necessary additives. Such a mass is formed into a ribbon, which then passes through a specialized heating furnace. When heated in the mass, cross-linking and foaming agents are activated. Then give it the appropriate thickness and wind it on a roll.