Apparatus for producing multilaminated film

Claim 1

An apparatus for producing multilaminated thermoplastic film comprising: a. a plurality of thermoplastic resin extruders; b. an elongated sheet film extruding die head; and c. a molten resin laminator located intermediate said plurality of extruders and said die head and operably connected therewith, said laminator comprising: 1. a body; 2. having a plurality of adjacent independent passageways therein for receiving molten resin from said extruders; 3. said plurality of adjacent independent passageways comprising a first independent passageway and at least one other independent passageway, each said other independent passageway lengthwise being generally parallel to the longitudinal axis of said first independent passageway, adjacent said independent passageways having a partition wall in common; 4. said independent passageways communicating with said extruders by suitable conduit means; 5. said plurality of independent passageways opening into a common passageway at the end of said body nearest said die head; d. said common passageway communicating with a manifold chamber in said die head and said manifold chamber being generally rectangular in cross section and having a first dimension not substantially greater than a corresponding first dimension of the opening of said common passageway, and a second dimension of said manifold chamber laterally of said first dimension of said manifold chamber substantially greater than a corresponding second dimension of the opening of said common passageway for receiving an expanded multilaminate resin flow from a composite resin plug traveling through said common passageway; and e. said die head having a passageway leading on substantially said second dimension of said manifold chamber from said manifold chamber to a long, narrow orifice in said die head and continuously converging from said manifold chamber and thus continuously reducing from said first dimension of said manifold chamber to said long, narrow orifice of said die head for a multilaminate resin stream flowing through said die head passageway to converge continuously from said first dimension while maintaining substantially said second dimension and issue as a multilaminated film through said orifice.

Claim 2

An apparatus for producing multilaminated thermoplastic film comprising: a. a plurality of thermoplastic resin extruders; b. an elongated sheet film extruding die head; and c. a molten resin laminator located intermediate said plurality of extruders and said die head and operably connected therewith, said laminator comprising: 1. a body; 2. having a plurality of adjacent independent passageways therein for receiving molten resin from said extruders; 3. said plurality of adjacent independent passageways comprising a first independent passageway and at least one other independent passageway, each said other independent passageway lengthwise being generally parallel to the longitudinal axis of said first independent passageway, adjacent said independent passageways having a partition wall in common; 4. said independent passageways communicating with said extruders by suitable conduit means; 5. said plurality of independent passageways opening into a common passageway at the end of said body nearest said die head; d. said common passageway communicating with a manifold chamber in said die head and said manifold chamber being generally rectangular in cross section and having a first dimension not substantially greater than a corresponding first dimension of the opening of said common passageway, and a second dimension of said manifold chamber laterally of said first dimension of said manifold chamber substantially greater than a corresponding second dimension of the opening of said common passageway for receiving an expanded multilaminate resin flow from a composite resin plug traveling through said common passageway; and e. said die head having a passageway leading on substantially said second dimension of said manifold chamber from said manifold chamber to a long, narrow orifice in said die head and continuously converging from said manifold chamber and thus continuously reducing from said first dimension of said manifold chamber to said long, narrow orifice of said die head for a multilaminate resin stream flowing through said die head passageway to converge continuously from said first dimension while maintaining substantially said second dimension and issue as a multilaminated film through said orifice.