Coextrusion foam melt

Increasing work in the field of HME and published literature reveals the innovative aspects of this technology. These include, but are not limited to, in situ salt formation, quick dispersing systems with foam like structures, coextrusion to prepare extrudates in the form of laminar structures with multiple layers, nanoparticles released from molecular dispersions manufactured by melt extrusion, and twin-screw melt granulation, which can provide continuous manufacturing of granules yielding consistent product quality attributes. 

Extrusion is the principal process for producing film and sheet. It is also used to create open (weather stripping) and closed (soda straws) profiles. Dual extruders can be used to produce laminates, a process called coextrusion. This is often done to provide barriers to ultraviolet light or moisture vapor. Two colors can also be extruded side-by-side for interesting effects. All thermoplastics can, theoretically, be extruded including foamed and reinforced materials. However, in practice, the highest melt temperature thermoplastic extruded in any volume is polycarbonate. Thermosets can also be extruded on a limited basis as they require special equipment and are slow to process. 

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