Sheet Extrusion
The extrusion process in which various resins or related raw material for plastic making are used to produce flat sheets in continuous or non continuous form is called as Sheet Extrusion.

The sheets could be of various thicknesses from vehicle bed liners playground equipment, containers, and boats , packaging applications including cling films, cups, trays etc

The thinner gauges are thermoformed into packaging applications such as deli containers, drink cups, produce trays, baby wipe containers and margarine tubs. Flat sheet is welded into large containment systems for mining applications and municipal waste disposal which is the third primary use for extruded sheet which is a geomembranes system.

The most common polymer for use in sheet extrusion continues to be Polystyrene. It is the dominant material for thermoformed packaging and competes with ABS and PP in technical markets. End use applications include tubs and pots for yogurt, margarine, and desserts. Thermoformed packaging is also used in many other applications in the food industry for packing various kinds of products.

The most common technique used in extruding plastic sheet for the thermoforming industry is Single layer flat extrusion. Resin is fed into an extruder where it is plasticized into a melt.

Other related extrusion processes are

Profile Extrusion
Overjacketing
Pipe Extrusion
Lamination
Foam etc.