Bag having an elastic band, and method for the production thereof
The bag ( 1 ) includes an elastic band ( 16 ) joined to the face ( 1 a ) of the bag by two joining areas ( 17; 2 a ) in such a manner that the useful length, when the elastic band is at rest (L 2 ), corresponds to the space between the two joining areas on the bag or is less than the length (L 1 ) of the longitudinal edge of the face. The elastic band extends over the entire width of the bag, from one lateral edge to the other, the elastic band being welded to two faces of the bag along these lateral edges, one of the at least two joining areas forming an intermediate joining area ( 17 ) located at a distance from the lateral edges.
1. A bag ( 1 , 101 , 201 ), comprising:
two opposite faces ( 1 a , 1 b ) joined together around an entire periphery except for one longitudinal edge, the two joined faces forming an interior with an opening ( 1 d ) at said longitudinal edge, the two joined faces forming a rim at the opening sized to be positioned over a peripheral edge of a container,
the two faces of the bag being welded to one another along two opposite lateral edges ( 2 , 3 ), and
a first face of the two faces having, near said opening, an elastic band extending from a first of the two lateral edges to a second of the two lateral edges, the elastic band being joined to said first face at each of the two lateral edges, and also joined to the first face at an intermediate joining position between the two lateral edges such that a first length (L 1 ) of the elastic band between each of the two lateral edges is greater than a second length (L 2 ) of the elastic band between the intermediate joining position and an other joining position, said second length (L 2 ) corresponding to an effective relaxed length of said elastic band, and the elastic band being free of adhesion to said first face along an entirety of the second length (L 2 ),
and the second length (L 2 ) of the elastic band having an elasticity sufficient to, when the rim is positioned over the peripheral edge of the container, i) stretch over the opening to a position on a second of the two faces and ii) exert an elastic force sufficient to hold the rim onto the peripheral edge of the container.
2. The bag as claimed in claim 1 ,
wherein each face of the bag comprises a hem ( 8 ) bordering said opening ( 1 d ), and
wherein a non-elastic drawstring ( 6 , 106 ) located in the hem of each face, the non-elastic drawstring configured to be grasped from the outside via at least one notch ( 12 , 112 ) made through the hem.
3. The bag as claimed in claim 2 , wherein each face of the bag is folded inward to form a fold ( 4 ) along the longitudinal edge of the bag such that a first part of the fold ( 4 ) forms the hem ( 8 ) and a second part of the fold extends beyond the first part to form a skirt ( 4 b ), said elastic band being joined at each of the joining positions to at least partially overlap said skirt.
4. The bag as claimed in claim 1 , wherein each face of the bag associated with said elastic band is folded inward to form a fold ( 4 ) along the longitudinal edge of the bag, and said elastic band at each of the joining positions at least partially overlaps said fold ( 4 ).
5. The bag as claimed in claim 1 , wherein the elastic band is further welded to the bag at an additional intermediate joining position ( 17 ′) located at a position spaced from the two lateral edges ( 2 , 3 ) and from the intermediate joining position ( 17 ), the additional intermediate joining position forming the other joining position.
6. The bag as claimed in claim 1 , wherein one of the two lateral edges furthest from the intermediate joining position forms the other joining position.
7. The bag as claimed in claim 1 , wherein the elastic band is joined to an inside face of the bag.
8. The bag as claimed in claim 1 , wherein the elastic band is joined to an outer face of the bag.
9. The bag as claimed in claim 1 , wherein the elastic band is cut longitudinally into two vertically adjacent tapes ( 116 a , 116 b ), and the joining positions lie in vertical extension of one another, so that the two vertically adjacent tapes form a closed loop with the bag, each of the tapes of said loop configured to extend around an opposite side of the container.
10. The bag as claimed in claim 1 , wherein said elastic band has a degree of elongation of less than 150%.
11. The bag as claimed in claim 10 , wherein said elastic band has a degree of elongation of approximately 100%.
12. The bag as claimed in claim 1 , wherein the second length (L 2 ) is sufficient for a person's hand to fit in its entirety between the intermediate joining position and the other joining position.
13. A series of bags ( 1 , 101 , 201 ), comprising:
a plurality of bags having longitudinal edges and lateral edges, the lateral edges of said bags being attached to one another, said plurality of bags having a longitudinal direction corresponding to longitudinal edges of said bags,
wherein each bag comprises two opposite faces ( 1 a , L b ) joined together around a whole periphery of the bag except for one longitudinal edge, the two joined faces forming an interior of the bag with an opening ( 1 d ) at said longitudinal edge, the two joined faces forming a rim at the opening sized to be positioned over a peripheral edge of a container,
the two faces of each bag being welded to one another along two opposite lateral edges ( 2 , 3 ) of each bag, and
a first face of the two faces having, near said opening, an elastic band extending from a first of the two lateral edges to a second of the two lateral edges, the elastic band being joined to said first face at each of the two lateral edges, and also joined to the first face at an intermediate joining position between the two lateral edges such that a first length (L 1 ) of the elastic band between each of the two lateral edges is greater than a second length (L 2 ) of the elastic band between the intermediate joining position and an other joining position, said second length (L 2 ) corresponding to an effective relaxed length of said elastic band, and the elastic band being free of adhesion to said first face along an entirety of the second length (L 2 ),
and the second length (L 2 ) of the elastic band having an elasticity sufficient to, when the rim is positioned over the peripheral edge of the container, i) stretch over the opening to a position on a second of the two faces and ii) exert an elastic force sufficient to hold the rim onto the peripheral edge of the container.
14. The series of bags as claimed in claim 13 , wherein the elastic band is further welded to each bag at an additional joining position spaced from the two lateral edges and from the intermediate joining position, the additional intermediate joining position forming the other joining position.
15. The series of bags as claimed in claim 13 , wherein one of the two lateral edges furthest from the intermediate joining position forms the other joining position.
16. The series of bags as claimed in claim 13 , wherein the second length (L 2 ) is sufficient for a person's hand to fit in its entirety between the intermediate joining position and the other joining position.
17. A bag, comprising:
first and second opposite faces joined together at a first longitudinal edge and two opposing lateral edges, the two opposing lateral edges spaced from each other by a first length (L 1 ), the first and second faces forming an opening at a second longitudinal edge, and the first longitudinal edge forming a bottom of the bag, the first and second joined faces forming a rim at the opening sized to be positioned over a peripheral edge of a container; and
an elastic band extending longitudinally along a direction of the first length (L 1 ) at a position near the second longitudinal edge, the elastic band joined to the one of the first and second faces at first and second joining positions on the one of the first and second faces, at least one of the joining positions being spaced from both of the two opposing lateral edges,
wherein an effective relaxed length of said elastic band corresponds to a second length (L 2 ) between the first and second joining positions, the distance (L 2 ) being shorter than the length (L 1 ),
wherein the elastic band is free of adhesion to said first face along an entirety of the second length (L 2 ), and
wherein the second length (L 2 ) of the elastic band has an elasticity sufficient to, when the rim is positioned over the peripheral edge of the container, i) stretch over the opening to a position on a second of the two faces and ii) exert an elastic force sufficient to hold the rim onto the peripheral edge of the container.
18. The bag as claimed in claim 17 , wherein one of the first and second joining positions is at one of the two lateral edges furthest from the intermediate connection region.
19. The bag as claimed in claim 17 , wherein both of the first and second joining positions are spaced from the two lateral edges.
20. The bag as claimed in claim 17 , wherein the second length (L 2 ) is sufficient for a person's hand to fit in its entirety between the first and second joining positions.