CHIPPEWA FALLS, WIS. (Sept. 14, 11:5 a.m. EDT) — At K 2001, Extrusion Dies Inc. will expand its Accuflow coextrusion feedblock to handle five layers of film, sheet and coatings.
Also new from EDI: a sheet-die system that makes it possible to adjust width and thickness over a very broad range, with minimal downtime.
EDI of Chippewa Falls will exhibit at Hall 3, Stand E 79-1.
The Accuflow feedblock allows highly precise, on-line adjustment of layer thickness, according to the flat-die maker. Also at K, EDI will announce successful commercial applications of the three-layer Accuflow, introduced last year at NPE in Chicago.
In multilayer, flat-die extrusion and web converting, a feedblock shapes each stream of polymer into a layer, then combines all layers into a single sandwich structure that gets distributed by the manifold into film, sheet or coating. Normally, operators must exchange one set of flow inserts for another when they want to change the dimensions of the finished product.
Accuflow uses a single set of easily adjustable combining spools, instead of the multiple-flow inserts. Each of the four melt streams enters into one of four cylindrical combining spools, which add the skin layers to the core.
The fast-change sheet-die system combines a fast deckle system, a Fast Gap gap-adjustment system and a Sliding Flex-Lip design for the upper die lip.
EDI said Spartech Corp.'s sheet plant in Greenville, Ohio, is the first company to use the new die system. The die permits the width to be adjusted from 60 inches to 120 inches in 15 minutes. Thickness can be varied from 0.04-0.5 inch without having to change the lip.