초록 ▼

The present invention provides a flexible bag comprising at least one sheet of flexible sheet material assembled to form a semi-enclosed container having an opening defined by a periphery. The opening defines an opening plane, and the bag has an upper region adjacent to the opening and a lower regio

The present invention provides a flexible bag comprising at least one sheet of flexible sheet material assembled to form a semi-enclosed container having an opening defined by a periphery. The opening defines an opening plane, and the bag has an upper region adjacent to the opening and a lower region below the upper region. The upper region has a preferential elongation axis perpendicular to the opening plane which permits the upper region to expand in response to an externally-applied force upon the bag, while the lower region has a preferential elongation axis parallel to the opening plane which permits the lower region to expand in response to forces exerted by contents within the bag to provide an increase in volume of said bag. The bag therefore exhibits increased stability in use and is easier to close.

대표청구항 ▼

1. A flexible bag comprising at least one sheet of flexible sheet material assembled to form a semi-enclosed container having an opening defined by a periphery, said opening defining an opening plane, said bag having an upper region adjacent to said opening and a lower region below said upper region

1. A flexible bag comprising at least one sheet of flexible sheet material assembled to form a semi-enclosed container having an opening defined by a periphery, said opening defining an opening plane, said bag having an upper region adjacent to said opening and a lower region below said upper region, said upper region having an elongation axis perpendicular to said opening plane which permits said upper region to expand in response to an externally-applied force upon said bag, said lower region having an elongation axis parallel to said opening plane which permits said lower region to expand in response to forces exerted by contents within said bag to provide an increase in volume of said bag, wherein said sheet material exhibits an elastic-like behavior along at least one axis, said sheet material comprising: at least a first region and a second region, said first region and said second region being comprised of the same material composition and each having an untensioned projected pathlength, said first region undergoing a substantially molecular-level deformation and said second region initially undergoing a substantially geometric deformation when said web material is subjected to an applied elonation in a direction substantially parallel to said axis in response to an externally-applied force upon said flexible storage bag when formed into a closed container, said first region and said second region substantially returning to their untensioned projected pathlength when said applied elongation is released.