Tear strand for packages

Claim 2

Package formed, at least in part, of a sheet material, a flexible cutting strand disposed within and bonded to the sheet material and comprising a core with a cutting filament wound helically around Said core, and with the turns thereof spacedapart longitudinally of the core.

Claim 3

Package as set forth in claim 1 in which said cutting strand comprises a soft, compactible core with a metallic filament wound helically around the core.

Claim 4

Package as set forth in claim 1 in which said cutting filament is helically wound unidirectionally about said core throughout its length.

Claim 5

Package as set forth in claim 1 in which said cutting strand is carried in a strip of metal material bonded to the sheet material of said package.

Claim 6

Package as set forth in claim 4 in which said sheet material of the said package is a thermoplastic material and in which said cutting strand is carried by a thermoplastic strip heat sealed to said sheet material of the package.

Claim 7

Package as set forth in claim 5 in which the core of the said cutting strand is a fibrous thread and in which said cutting filament is a malleable metallic wire.

Claim 8

Package as set forth in claim 5 in which said cutting filament has at least 21 turns per inch about said core.

Claim 9

Package of thermoplastic sheet material in the form of a bag, a flexible closure and cutting strip sealed within said bag between opposed edge portions, said strip comprising a soft core, a cutting filament disposed helically about the core and a thermoplastic web carrier for said core and filament, said strip being laminated between said opposed edge portions and a pull tab cut out of the laminated sealed portion of said package adjacent the end of said cutting strip, said core and cutting filament being interlocked in the thermoplastic cutout portion of the tab.

Claim 10

Package of thermoplastic sheet material in the form of a bag, a flexible closure and cutting strip sealed within said bag between opposed edge portions, said strip comprising a soft core, a cutting filament disposed helically about the core and a thermoplastic web carrier for said core and filament, said strip being laminated between said opposed edge portions and a pull tab cut out of the laminated sealed portion of said package adjacent the end of said cutting strip, said core and cutting filament being interlocked in the thermoplastic cutout portion of the tab.

Claim 11

Package closure and opening strip comprising a web of sheet material, a cutting strand carried by said web, said cutting strand comprising a soft, flexible core, a metallic cutting wire wound helically around the core and extending outwardly of the surface thereof, the corrugations formed by the turns of said wire providing a sawtooth cutting surface and means for interlocking the cutting strand against longitudinal displacement relative to said web.

Claim 12

Package closure and opening strip comprising a web of sheet material, a cutting strand carried by said web, said cutting strand comprising a soft, flexible core, a metallic cutting wire wound helically around the core and extending outwardly of the surface thereof, the corrugations formed by the turns of said wire providing a sawtooth cutting surface and means for interlocking the cutting strand against longitudinal displacement relative to said web.

Claim 13

Package closure as set forth in claim 9 in which said web is a thermoplastic material, said core is a fibrous thread and said cutting wire is a stainless steel wire wound about the thread at least 21 turns per inch of thread.