Nine extruders, five layers, one striped, thermoformed yogurt cup


With nine extruders that can be configured to provide numerous stripe and layer combinations, Welex (Blue Bell, PA) says its new five-layer sheet-extrusion system for multicolored food packaging sets a new mark for the number of extruders on one die. Built for a European custom-sheet manufacturer for use in thermoformed yogurt cups, the system has already been shipped and is expected to begin production in April.

The Welex system produces sheet up to 60-inches (1500-mm) wide with thicknesses from 0.020 to 0.060-inch (500 to 1500 µm) and throughput ranging up to 3000 lb/hr (1500 kg/hr). The nine extruders are from 2.5- to 3.5-inches, with a 30:1 LD ratio and vented, air-cooled barrels featuring two-stage screws to run high-impact polystyrene (HIPS) in a range of colors. The five-layer sheet construction includes a crystal PS gloss layer, a five-color custom-configurable stripe layer, a white layer, a scrap foam layer, and a white bottom layer. The scrap foam layer is produced via a proprietary gas-blown foam process. Welex notes that the system can also run polypropylene with no equipment changes....
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