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Sheet extrusion equipment for in-line thermoforming
 

Packaging Industry producers are seeking the most efficient methods to produce their end - products to gain economical advantages in today's market place. Historically, typical sheet thermoforming facilities acquired sheet from outside sources or produced their own roll stock for subsequent forming operations. Although the in-line sheet thermoforming process has been available for many years, the recent trend by high volume proceducers has been to integrate the sheet product on line, in-line, with the thermoforming operator. Several benefits are obtained from such systems:-

Reduced energy consumption in the total process
High Volume Production
Continuous operations improves efficency
Direct process feed back of thermormed skeletal reclaim
Roll stand system down - sized, reduceing space utilisation
Timely production of furnished goods, reducing inverntory level requirements.

Packaging resins typically processed include Polypropylene, Polystyrene, Polyester, ABS and Polyethylene. End products consist primarily of packaging goods like Cups, Plates and Containers. Producers have applied the system to both shallow and deep draw goods. The extrusion complex is closely coupled with the downstream equipment, with the thermoforming line is to retain residual heat in the sheet, reducing the reheat demand at the forming station. In addition, the down sized sheet conditioning unit brings a lower capital cost for the extrusion complex, plies a reduced floor plan requirement. The extrusion complex is designed to reprocess 100% of the clean, ground, thermoformed, skeletal sheet which may be a monolayer or Co-extruded structure improving the overall process efficiency.

Courtesy: E.J.Smith, Davis Standard Corporation, U.S.A. SPE Extrusion Division Newsletter, March 2000.
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