The extrusion coating process of the coating machine for canvas is to apply a molten web of synthetic resin to the base material. It is a multifunctional coating technology for various plastics, especially polyethylene, cardboard, corrugated fiberboard. Economical applications of paper, aluminum foil, cellulose, non-woven or plastic film.
The actual process of canvas coater extrusion coating involves direct extrusion of the resin from the slot die onto a moving web at temperatures up to 320 ° C, and then the web can be passed through a rubber roller covered by a coater and a nip consisting of a chrome-plated chill roll. The latter cools the molten film back to the solid state and imparts the desired finish to the plastic surface.
Extrusion lamination is a similar process except that the extruded hot melt resin acts as a binding medium for the second web of material. Coextrusion is also a similar process, but two or more extruders are attached to a single die where the separately extruded melts are put together and finally extruded into a multilayer film.