Patent Application

App. No. 14/267,375

Abstract

Claims (24)

1 . A die for forming a stretch film, said die comprising:

a primary passage for receiving a primary stream, said primary passage having a length extending from a die inlet opening to a die outlet opening; and

a flow assembly for supplying a secondary stream to said primary passage at a secondary passage opening located upstream of the die outlet opening.

2 . The die of claim 1 , wherein said flow assembly is a manifold, said manifold comprising a manifold inlet opening for receiving said secondary stream and a manifold outlet opening, said manifold outlet opening disposed in communication with said secondary passage opening.

3 . The die of claim 2 , wherein said manifold is approximately cylindrical in shape.

4 . The die of claim 3 , further wherein said manifold comprises a tubular.

5 . The die of claim 1 , wherein said primary passage further comprises a plurality of secondary passage openings positioned substantially equidistant from each other across a width of said primary passage.

6 . The die of claim 5 , said manifold further comprising a plurality of manifold outlet openings, further wherein said plurality of secondary passage openings are disposed in communication with said plurality of manifold outlet openings.

7 . The die of claim 6 , wherein at least one of said plurality of secondary passage openings is capable of being closed.

8 . The die of claim 6 , wherein at least one of said plurality of manifold outlet openings is capable of being closed.

9 . A method for forming a stretch film, said method comprising:

introducing a primary stream to a primary passage of a die at a die inlet opening, said primary passage having a length extending from said die inlet opening to a die outlet opening;

supplying a secondary stream to said primary passage at a secondary passage opening located upstream of the die outlet opening using a flow assembly;

combining said primary stream and said secondary stream to create a combined stream;

passing said combined stream through said die outlet opening; and

passing the combined stream from the die outlet opening to a casting unit, thereby forming a film web.

10 . The method of claim 9 , further comprising supplying said secondary stream to said primary passage using a manifold, said manifold comprising a manifold inlet opening and a manifold outlet opening, said manifold outlet opening disposed in communication with said secondary passage opening.

11 . The method of claim 10 , further comprising disposing said manifold in communication with said primary passage, wherein said manifold is approximately cylindrical in shape.

12 . The method of claim 11 , further comprising disposing a tubular in communication with said primary passage.

13 . The method of claim 9 , further comprising disposing a plurality of secondary passage openings positioned substantially equidistant from each other across a width of said main passage.

14 . The method of claim 10 , further comprising disposing said manifold in communication with said primary passage, wherein said manifold comprises a plurality of manifold outlet openings.

15 . The method of claim 14 , further comprising disposing said plurality of manifold outlet openings in communication with said plurality of secondary passage openings.

16 . The method of claim 15 , further comprising closing at least one of the plurality of secondary passage openings.

17 . The method of claim 15 , further comprising closing at least one of the plurality of manifold outlet openings.

Assignments (9)