Co-Extrusion
In addition to monolayer extrusion coated films and laminates, we have the capability to
provide co-extruded composites. The films are extruded from two separate resin
streams but may be combined in either two or three layer structures.
Co-extrusion enables the films to perform multiple functions, which may not be
possible on a single film. For example, we could place a film extruded from ethylene
vinyl acetate resin on one or both sides of a polypropylene core layer. This
would produce a composite that has both broad range heat seal and barrier
properties.
Duplex Film - Co-extrusion allows us to produce a duplex film using thermally or additive
modified versions of the same resin in each layer. For example, the top layer
of a two component film composite is extruded at a relatively cool temperature
to maximize oxidation and pinhole formation. The bottom layer is run hot to
optimize adhesion to the substrate.
Functional or decorative additives may be placed selectively in the film layer where they are
required. This makes better sense economically than dispersing expensive
materials throughout the melt. It also prevents contamination and compromise of
the bonding interphase.