초록 ▼

A bag made of flexible sheet material having an opening defined by a periphery. Juxtaposed with the periphery is a closure zone. The closure zone has induced extensibility in a direction perpendicular to the opening of the bag so that handle ties may be conveniently formed upon extension of the clos

A bag made of flexible sheet material having an opening defined by a periphery. Juxtaposed with the periphery is a closure zone. The closure zone has induced extensibility in a direction perpendicular to the opening of the bag so that handle ties may be conveniently formed upon extension of the closure zone material. The handle ties are bound together to form an integral closure for the bag. The induced extensibility is provided by a network of dual regions having different modes of extensibility. The dual region network also provides the advantage of an increased gripping surface for forming the handle ties.

대표청구항 ▼

1. A bag comprising at least one sheet of flexible material assembled to form a semi-enclosed container having an opening defined by a periphery, said bag having a fill direction generally perpendicular to said opening, said bag comprising a closure zone, said closure zone including a first region a

1. A bag comprising at least one sheet of flexible material assembled to form a semi-enclosed container having an opening defined by a periphery, said bag having a fill direction generally perpendicular to said opening, said bag comprising a closure zone, said closure zone including a first region and a second region, said first region undergoing a substantially molecular-level deformation and said second region initially undergoing a substantially geometric deformation when said sheet is subjected to applied tensile forces, said closure zone of said bag being extensible in said fill direction in response to tensile forces applied generally parallel said fill direction, said closure zone being juxtaposed with said periphery, said bag comprising a third zone with induced extensibility juxtaposed with said closure region and disposed towards said bottom of said bag, said third zone being extensible in a direction perpendicular said fill direction ill response to tensile forces applied in a like direction generally perpendicular to said fill direction. 2. A bag according to claim 1, wherein said third zone does not intercept said bottom of said bag. 3. A bag comprising at least one sheet of flexible material assembled to form a semi-enclosed container having an opening defined by a periphery, said bag having a fill direction generally perpendicular to said opening, said bag comprising a closure zone, said closure zone including a first region and a second region, said first region undergoing a substantially molecular-level deformation and said second region initially undergoing a substantially geometric deformation when said sheet is subjected to applied tensile forces, said closure zone of said bag being extensible in said fill direction in response to tensile forces applied generally parallel said fill direction, said closure zone being spaced apart from said periphery by a peripheral zone adjacent to said periphery and to said closure zone, said peripheral zone having no induced elasticity, said peripheral zone having a width taken parallel to said fill direction, said width being from 0.1 to 100 centimeters, said bag comprising a third zone with induced extensibility juxtaposed with said closure region and disposed towards said bottom of said bag, said third zone being extensible in a direction perpendicular said fill direction in response to tensile forces applied in a like direction generally perpendicular to said fill direction. 4. A bag according to claim 3, wherein said third zone does not intercept said bottom of said bag.