초록 ▼

Provided is a plastic bag including a live elastic strip that, in the elastic strip's normal condition, contracts thereby constricting an opening of the bag to assist in retaining the bag to an object. The elastic strip includes a first region that is continuously attached to a sidewall of the bag b

Provided is a plastic bag including a live elastic strip that, in the elastic strip's normal condition, contracts thereby constricting an opening of the bag to assist in retaining the bag to an object. The elastic strip includes a first region that is continuously attached to a sidewall of the bag between a first side edge and a second side edge of the bag and a second region that remains unattached to the sidewall. The attached region does not contract but instead forces the portion of the sidewall to which it is attached to pucker into a serpentine path. The unattached region does contract causing the portion of the sidewall to which it is adjacent to bunch together. Also provided is a method for manufacturing a plastic bag that involves stretching a live elastic tape and continuously attaching a region of the stretched tape to a web of plastic material.

대표청구항 ▼

1. A bag comprising:a first sidewall; a second sidewall, the second sidewall joined to the first sidewall by a closed bottom end, a first edge, and a second edge, thereby defining an open top end; a strip of live elastic material having a predefined width, a first discrete region along said width of

1. A bag comprising:a first sidewall; a second sidewall, the second sidewall joined to the first sidewall by a closed bottom end, a first edge, and a second edge, thereby defining an open top end; a strip of live elastic material having a predefined width, a first discrete region along said width of the strip continuously attached in a pre-stretched expanded length condition to the first sidewall while a remaining region along said width of the strip remains unattached such that the open top end is pulled together when the elastic material is allowed to contract, the strip extending from the fast edge to the second edge and positioned a distance below the open top end. 2. The bag of claim 1, wherein the strip is attached by an attachment selected from the group consisting of adhesive, heat sealing, stitching, and a combination thereof.3. The bag of claim 1, wherein the attached region has a first surface area, and the unattached region has a second surface area, the ratio of the first surface area to the second surface area being no greater than about 1.4. The bag of claim 1, wherein the strip is proximate to and parallel with the open top end.5. The bag of claim 1, further comprising:a second strip of live elastic material attached to the second sidewall. 6. The bag of claim 1, wherein the attached region corresponds with a middle portion of the strip while the unattached region corresponds to first and second edge portions of the strip.7. The bag of claim 1, wherein the bag comprises a type selected from the group consisting of a gusseted bag, a draw tape bag, and a tie-flap bag.8. The bag of claim 1, wherein the bag comprises a gusseted bag, and the first and second sealed edges comprise a first and second gussets, respectively.9. The bag of claim 1, the bag comprises a draw tape bag, wherein the first and second sidewalls each include a respective first and second hem flap, the first and second hem flaps being respectively attached to the first and second sidewalls at respective first and second hem seals thereby defining first and second hems, the bag further comprising a drawstring disposed within the first and second hems.10. The bag of claim 1, the bag comprises a tie-flap bag wherein the first and second sidewalls include respective first and second tie-flaps or more extending from the top end.11. A roll of bags comprising:a plurality of bags, each bag including a first sidewall, a second sidewall joined to the first sidewall so as to define a closed bottom end, a first edge, a second edge, and an open top end; the plurality of bags arranged to define a length with the first sealed edge of at least one bag joined to the second sealed edge of an adjacent bag; a tape of live elastic material stretched lengthwise under tension to an expanded length, the tape having a predefined width; a first discrete portion of the width of the tape continuously attached in its stretched expanded length condition to the length of the plurality of bags while a remaining portion along said width of the tape remains unattached; wherein the length of the plurality of bags rolled together about an axis normal to the first and second edges of the attached tape, whereby the roll maintains the attached tape in the stretched condition. 12. The roll of claim 11, wherein the length is rolled about a core.13. The roll of claim 11, wherein the joined first and second edges of the adjacent bags are perforated.