Abstract A film extrusion die comprising: a body having (1) means defining an inlet recess; (2) a longitudinally extending passageway communicating with said recess; (3) an extrusion manifold in flow communication with said inlet passageway extending substantially the entire width of the die; and (4) opposed wall portions in flow communication with said manifold which form an extrusion passageway leading from said manifold, one of said opposed wall portions being provided with a transversely disposed channel, and (5) a transversely disposed arched metering bar received in said channel, said bar including an extending portion which projects into said extrusion passageway leading from said manifold; a set of lips forming an elongated extrusion orifice extending substantially the entire width of the die with said set of lips attached to said body in flow communication with said extrusion passageway; and two die endplates, one attached to each end of said body respectively encapsulating each end of said manifold, extrusion passageway and lips.
A film extrusion die comprising: a body having (1) an inlet recess; (2) a longitudinally extending passageway communicating with said recess; (3) an extrusion manifold extending substantially the entire width of the die in flow communication with said longitudinally extending passageway; (4) opposed wall portions in flow communication with said manifold which form an extrusion passageway leading from said manifold, one of said opposed wall portions being provided with a transversely disposed channel and a fixed arched metering bar in said channel, said metering bar including an extending portion which projects into said extrusion passageway, said extending portion having its point of furthest projection substantially in line with said longitudinally extending passageway; (5) a set of lips forming an elongated extrusion orifice in flow communication with said extrusion passageway; and (6) two die endplates, one attached to each end of said body, encapsulating each end of said manifold, extrusion passageway, and die lips.
Claim 2
Dependent Claim
153 words
A film extrusion die comprising: a body having (1) an inlet recess; (2) a longitudinally extending passageway communicating with said recess; (3) an extrusion manifold extending substantially the entire width of the die in flow communication with said longitudinally extending passageway; (4) opposed wall portions in flow communication with said manifold which form an extrusion passageway leading from said manifold, one of said opposed wall portions being provided with a transversely disposed channel and a fixed arched metering bar in said channel, said metering bar including an extending portion which projects into said extrusion passageway, said extending portion having its point of furthest projection substantially in line with said longitudinally extending passageway; (5) a set of lips forming an elongated extrusion orifice in flow communication with said extrusion passageway; and (6) two die endplates, one attached to each end of said body, encapsulating each end of said manifold, extrusion passageway, and die lips.
Claim 3
Dependent Claim
20 words
The film extrusion die of claim 1 wherein the arched metering bar has a radius of Curvature of 265 feet.
Claim 4
Dependent Claim
24 words
The film die of claim 1 wherein the arched metering bar has a curvacious surface which constitutes the side surface of said extending portion.