Film-tape-closure device slot cast integrated interlocking structure and extrusion method
AssigneeUnion Carbide Corporation
InventorEwald A. Kamp
Life of this patent
Estimating the term…
Abstract
A method and apparatus for extruding a film, a tape and a closure device simultaneously to produce integrated interlocking closure stock comprising (a) extruding a sheet of film onto a rotating casting roll at a rate to provide a high draw-down ratio; (b) extruding a tape to join the film on the casting roll at a rate to provide a medium draw-down ratio; and (c) extruding a closure device onto the tape as it approaches the casting roll at a rate to provide a small draw-down ratio.
Claims15
A method of producing an integrated interlocking closure product comprising extruding a sheet of film onto a rotating casting roll at a rate to provide a high draw-down ratio, extruding a closure tape at a medium draw-down ratio to join said film, extruding a closure device at a small draw-down ratio to join said closure tape, and cooling said film, closure tape, and closure device on said casting roll.
A method of producing an integrated film, closure tape, and closure device structure comprising extruding from a first die a sheet of film at a high draw-down ratio onto a rotating casting roll;
- extruding from a second die a closure tape at a medium draw-down ratio to join said film on said casting roll;
- extruding from a third die a closure device at a small draw-down ratio to join said closure tape;
- and extracting the integrated structure after cooling.
Apparatus for producing an integrated film, closure tape, and closure device structure comprising means for extruding a sheet of film onto a rotating casting roll;
- means for extruding a closure tape to join said film on said casting roll;
- means for extruding a closure device to join said tape;
- and means for extracting the integrated structure after cooling.
Dependencies are inferred from the claim text.