Five-Layer Dies Replace Feedblocks In Cast Film

In the past three years, Extrusion Dies Industries LLC (EDI) in Chippewa Falls, Wis., has delivered around a dozen five-manifold cast-film dies for oriented packaging film, each one replacing a traditional five-layer feedblock and single-manifold die.

In the past three years, Extrusion Dies Industries LLC (EDI) in Chippewa Falls, Wis., has delivered around a dozen five-manifold cast-film dies for oriented packaging film, each one replacing a traditional five-layer feedblock and single-manifold die. The multi-manifold die is about 21 in. deep—thicker than a single manifold—but it takes up less room overall because there’s no feedblock, EDI says. Market interest is said to be growing because a multi-manifold die with automatic gauge control imparts more accurate layer control than a five-layer feedblock. It also controls layer width more accurately with deckles to keep sticky PP copolymers out of tenter clips in OPP, for example. All five-manifold dies so far have been 40 to 50 in. wide.