Woven plastic bags with features that reduce leakage, breakage and infestations
A woven laminated plastic bag having features that further prevent leakage of contents out of the bag, or infestation of organisms into the contents of the bag is provided. In various aspects the bag can be fabricated from woven polypropylene and/or polyethylene layer which can be laminated with a film layer, can form a pinch bottom bag, and can have one or both sides include graphics and/or printing. The bag can also provide a top end and/or a bottom end either or both of which provide a discrete area which may contain discrete graphics and/or printing. The bag can also include a tape covered easy open feature that facilitates removal of tightly adhered sealing tape.
1. A method of manufacturing a bag, said method comprising:
(a) providing a continuous sheet of material, wherein the material comprises at least three laminated layers, said layers comprising a first layer comprising woven strips comprising oriented polypropylene, a second layer comprising an oriented film comprising polypropylene, and a third layer comprising a film comprising polypropylene, wherein the third layer laminates the first and second layers;
(b) cutting an individual bag blank from the continuous sheet;
(c) forming said individual blank into the bag having a top end and a bottom end, a first wall, a second wall, a first side wall, and a second side wall wherein the first and second side walls are disposed on opposite sides of the first and second walls and connect the first wall to the second wall;
(d) cutting the first layer, the second layer, and the third layer of either the first wall or the second wall of the bag with a plurality of cuts, wherein the plurality of cuts define a shape comprising at least one row extending parallel to a top or bottom edge of the bag across a portion of the first wall or the second wall;
(e) applying a strip of sealing tape to a surface of the first or second wall and wherein the sealing tape covers the plurality of cuts;
wherein the tape comprises:
a length, a width, a bottom surface comprising an adhesive and a top surface,
a first end and a second end at opposite sides of the length of the sealing tape,
a first edge and a second edge at opposite sides of the width of the sealing tape,
a first portion of the sealing tape comprising an outer edge and an inner edge wherein the outer edge of the first portion of the sealing tape is the first edge of the sealing tape and the inner edge of the first portion of the sealing tape is a first edge of a third portion of the sealing tape;
a second portion of the sealing tape comprising an outer edge and an inner edge wherein the outer edge of the second portion of the sealing tape is the second edge of the sealing tape and the inner edge of the second portion of the sealing tape is a second edge of the third portion of the sealing tape; and
the third portion of the sealing tape disposed at least in part between and in contact with the inner edge of the first portion of the sealing tape and the inner edge of the second portion of the sealing tape;
wherein the first, second and third portions of the sealing tape each comprise a first end and a second end;
wherein the sealing tape is adapted such that when the tape is adhesively attached to a surface, pulling up on an end of the third portion of the sealing tape is effective to separate at least a portion of the third portion of the sealing tape from the surface while leaving the adjacent first and second portions of the sealing tape adhered to the surface; and sealing the top or bottom end of the bag, wherein the bag is adapted to be filled with at least ten pounds by weight of at least one filling material, and the second end of the bag is adapted to be sealed after the bag has been filled.
2. The method of claim 1 , wherein the third portion of the sealing tape comprises a separate strip of tape adhered to the first or second wall of the bag and further adhered to the top surface, the bottom surface, or a combination of the top surface and the bottom surface of the first and second portions of the sealing tape by overlapped edges.
3. The method of claim 1 , wherein the sealing tape comprises two strings adhered to the bottom surface of the sealing tape, or embedded within the sealing tape adhesive, wherein the third portion of the sealing tape is defined as the portion of the sealing tape between the strings, and wherein pulling up on an end of the third portion causes the strings to cut through the sealing tape, at least partially separating the third portion from the first and second portions of the sealing tape.
4. The method of claim 1 , wherein the width of the third portion of the sealing tape is from 10% to about 30% of the total width of the sealing tape.
5. The method of claim 1 , wherein the width of the third portion of the sealing tape is from about 12½% to about 25% of the total width of the sealing tape.
6. The method of claim 1 , wherein the sealing tape is from 1.5 to 3 inches in width.
7. The method of claim 1 , wherein at least one end of the third portion of the sealing tape comprises a tab, wherein the tab is not adhered to the first or second wall of the bag.
8. The method of claim 1 , wherein the sealing tape exhibits a peel resistance according to a 180 Degree Peel Test per ASTM D3330/3330M-04(2010), and wherein the third portion of the sealing tape has a peel resistance of no more than 50% of the peel resistance of the entire width of the sealing tape.
9. The method of claim 1 , wherein the third portion of the sealing tape has a peel resistance of no more than 30% of the peel resistance of the entire width of the sealing tape.
10. The method of claim 1 , wherein the first layer further comprises high density polyethylene, low density polyethylene, polyester, or any combination thereof.
11. The method of claim 1 , wherein the second layer further comprises polyethylene, polyethylene terephthalate, polyamide, or any combination thereof or paper.
12. The method of claim 1 , wherein the first layer and/or the second layer further comprises biaxially-oriented polypropylene, oriented polyethylene, biaxially-oriented polyethylene, oriented polyethylene terephthalate, biaxially-oriented polyethylene terephthalate, oriented polyamide, biaxially-oriented polyamide, coated paper or any combination thereof.
13. The method of claim 1 , wherein the third layer further comprises high density polyethylene, low density polyethylene, polyester, or any combination thereof.
14. The method of claim 1 , wherein the third layer further comprises polyethylene, polyethylene terephthalate, polyamide, or any combination thereof.
15. The method of claim 1 , wherein the step of cutting comprises punching, cutting, laser cutting, or a combination thereof.
16. The method of claim 1 , further comprising the step of reverse printing graphics and/or printing on the third layer.
17. A method of manufacturing a bag, said method comprising:
(a) providing a continuous sheet of material, wherein the material comprises at least three laminated layers, said layers comprising a first layer comprising woven strips comprising oriented polyethylene, a second layer comprising an oriented film comprising polyethylene, and a third layer comprising a film comprising polyethylene, wherein the third layer laminates the first and second layers;
(b) cutting an individual bag blank from the continuous sheet;
(c) forming said individual blank into the bag having a top end and a bottom end, a first wall, a second wall, a first side wall, and a second side wall wherein the first and second side walls are disposed on opposite sides of the first and second walls and connect the first wall to the second wall;
(d) cutting the first layer, the second layer, and the third layer of either the first wall or the second wall of the bag with a plurality of cuts, wherein the plurality of cuts define a shape comprising at least one row extending parallel to a top or bottom edge of the bag across a portion of the first wall or the second wall;
(e) applying a strip of sealing tape to a surface of the first or second wall and wherein the sealing tape covers the plurality of cuts;
wherein the tape comprises:
a length, a width, a bottom surface comprising an adhesive and a top surface,
a first end and a second end at opposite sides of the length of the sealing tape,
a first edge and a second edge at opposite sides of the width of the sealing tape,
a first portion of the sealing tape comprising an outer edge and an inner edge wherein the outer edge of the first portion of the sealing tape is the first edge of the sealing tape and the inner edge of the first portion of the sealing tape is a first edge of a third portion of the sealing tape;
a second portion of the sealing tape comprising an outer edge and an inner edge wherein the outer edge of the second portion of the sealing tape is the second edge of the sealing tape and the inner edge of the second portion of the sealing tape is a second edge of the third portion of the sealing tape; and
the third portion of the sealing tape disposed at least in part between and in contact with the inner edge of the first portion of the sealing tape and the inner edge of the second portion of the sealing tape;
wherein the first, second and third portions of the sealing tape each comprise a first end and a second end;
wherein the sealing tape is adapted such that when the tape is adhesively attached to a surface, pulling up on an end of the third portion of the sealing tape is effective to separate at least a portion of the third portion of the sealing tape from the surface while leaving the adjacent first and second portions of the sealing tape adhered to the surface; and
sealing the top or bottom end of the bag, wherein the bag is adapted to be filled with at least ten pounds by weight of at least one filling material, and the second end of the bag is adapted to be sealed after the bag has been filled.
18. The method of claim 17 , wherein the third portion of the sealing tape comprises a separate strip of tape adhered to the first or second wall of the bag and further adhered to the top surface, the bottom surface, or a combination of the top surface and the bottom surface of the first and second portions of the sealing tape by overlapped edges.
19. The method of claim 17 , wherein the sealing tape comprises two strings adhered to the bottom surface of the sealing tape, or embedded within the sealing tape adhesive, wherein the third portion of the sealing tape is defined as the portion of the sealing tape between the strings, and wherein pulling up on an end of the third portion causes the strings to cut through the sealing tape, at least partially separating the third portion from the first and second portions of the sealing tape.
20. The method of claim 17 , wherein the width of the third portion of the sealing tape is from 10% to about 30% of the total width of the sealing tape.
21. The method of claim 17 , wherein the width of the third portion of the sealing tape is from about 12½% to about 25% of the total width of the sealing tape.
22. The method of claim 17 , wherein the sealing tape is from 1.5 to 3 inches in width.
23. The method of claim 17 , wherein at least one end of the third portion of the sealing tape comprises a tab, wherein the tab is not adhered to the first or second wall of the bag.
24. The method of claim 17 , wherein the sealing tape exhibits a peel resistance according to a 180 Degree Peel Test per ASTM D3330/3330M-04(2010), and wherein the third portion of the sealing tape has a peel resistance of no more than 50% of the peel resistance of the entire width of the sealing tape.
25. The method of claim 17 , wherein the third portion of the sealing tape has a peel resistance of no more than 30% of the peel resistance of the entire width of the sealing tape.
26. The method of claim 17 , wherein the first layer further comprises high density polyethylene, low density polyethylene, polyester, polypropylene, or any combination thereof.
27. The method of claim 17 , wherein the second layer further comprises polyethylene, polyethylene terephthalate, polyamide, polypropylene, or any combination thereof or paper.
28. The method of claim 17 , wherein the first layer and/or the second layer further comprises biaxially-oriented polypropylene, oriented polyethylene, biaxially-oriented polyethylene, oriented polyethylene terephthalate, biaxially-oriented polyethylene terephthalate, oriented polyamide, biaxially-oriented polyamide, coated paper or any combination thereof.
29. The method of claim 17 , wherein the third layer further comprises high density polyethylene, low density polyethylene, polyester, polypropylene, or any combination thereof.
30. The method of claim 17 , wherein the third layer further comprises polyethylene, polyethylene terephthalate, polyamide, polypropylene, or any combination thereof.
31. The method of claim 17 , wherein the step of cutting comprises punching, cutting, laser cutting, or a combination thereof.
32. The method of claim 17 , further comprising the step of reverse printing graphics and/or printing on the third layer.