Bag for the transport and storage of bulk goods and method of producing such a bag
A bag for the transport and storage of bulk goods including a main body having at least a bottom part and four sides connected in pairs along adjacent edges to form vertical ridges at four corners of the bag. The bag further includes four lifting straps, each having first and second end sections and an intermediate section rising above a top surface of the bag. The lifting straps are interconnected in pairs by two sleeves to form tubings or ducts extending longitudinally along a top surface of the bag to allow lifting of the bag by means of a forklift. The sleeves are connected to the main body of the bag via the lifting straps and are not attached longitudinally to the main body of the bag. Furthermore, the first and second end sections of each lifting strap are secured to corresponding sides of the bag.
1 . A bag for the transport and storage of bulk goods comprising a main body including at least a bottom part and four sides connected in pairs along adjacent edges to form vertical ridges at four corners of the bag,
wherein the bag further comprises four lifting straps, each comprising first and second end sections and an intermediate section rising above a top surface of the main body of the bag,
wherein the lifting straps are interconnected in pairs by two sleeves to form tubings or ducts extending longitudinally along the top surface of the main body of the bag to allow lifting of the bag by means of a forklift,
wherein terminal ends the sleeves are connected to the main body of the bag via the lifting straps,
wherein a longitudinal length of each sleeve, between the terminal ends, is not attached to the main body of the bag to form a longitudinal spacing between the sleeves and the main body,
wherein the first and second end sections of each lifting strap are secured to corresponding sides of the bag,
wherein the intermediate section of each lifting strap is reinforced to force the intermediate section into an essentially upright configuration rising above the top surface of the main body of the bag when no load is applied onto a top portion of the bag,
and wherein the intermediate section is reinforced by means of a flexible reinforcement tube surrounding the intermediate section.
2 . The bag according to claim 1 , wherein the first and second end sections of each lifting strap are non-overlapping vertical end sections that are sewn on different portions of the corresponding sides of the bag,
and wherein the intermediate section of each lifting strap is a U-shaped intermediate section rising above the top surface of the main body of the bag.
3 . The bag according to claim 2 , wherein the first and second end sections extend and are sewn vertically along substantially all of relevant portions of the corresponding sides of the bag.
4 . The bag according to claim 2 , wherein the first and second end sections are sewn on different portions of a front or rear side of the bag.
5 . The bag according to claim 1 , wherein the flexible reinforcement tubes are made of a flexible polymer or biopolymer material.
6 . The bag according to claim 1 , wherein the terminal ends of the sleeves are each provided with a hem surrounding part of the flexible reinforcement tube, and thus part of the intermediate section of the associated lifting strap, and thereby provide connection of the terminal ends of the sleeves to the main body of the bag via the lifting straps.
7 . The bag according to claim 6 , wherein each hem is formed by folding and stitching a terminal portion at each terminal end of the sleeves.
8 . The bag according to claim 7 , wherein the hem is not stitched to the intermediate section of the associated lifting strap.
9 . The bag according to claim 6 , wherein each hem is configured to allow a relative movement of each hem with respect to the intermediate section of the associated lifting strap.
10 . The bag according to claim 1 , wherein a bottom portion of each sleeve, at each terminal end of each sleeve, is secured to the top surface of the main body of the bag while maintaining the longitudinal spacing between the sleeves and the main body.
11 . The bag according to claim 1 , wherein the sleeves are made of a transparent or translucent material.
12 . The bag according to claim 5 , wherein the flexible reinforcement tubes are made of polyvinyl chloride (PVC), polyethylene (PE), bio-polyethylene (bio-PE), polypropylene (PP), bio-polypropylene (bio-PP) or silicone.
13 . A method of producing the bag of claim 1 , comprising the following steps:
a) producing a pair of said sleeves independently of the main body of the bag, each sleeve having terminal ends;
b) producing two pairs of said lifting straps;
c) connecting each terminal end of each sleeve to the intermediate section of a corresponding one of the lifting straps; and
d) securing the first and second end sections of each lifting strap to the corresponding sides of the bag so that the intermediate section rises above the top surface of the main body of the bag.
14 . The method according to claim 13 , wherein the first and second end sections of each lifting strap are secured to the corresponding sides of the bag at step d) by stitching.
15 . The method according to claim 14 , wherein the first and second end sections of each lifting strap are non-overlapping vertical end sections that are sewn at step d) on different portions of the corresponding sides of the bag,
and wherein the intermediate section of each lifting strap is a U-shaped intermediate section rising above the top surface of the main body of the bag.
16 . The method according to claim 15 , wherein the first and second end sections extend and are sewn vertically along substantially all of relevant portions of the corresponding sides of the bag.
17 . The method according to claim 15 , wherein the first and second end sections are sewn on different portions of a front or rear side of the bag.
18 . The method according to claim 13 , further comprising the step of reinforcing the intermediate section of each lifting strap to force the intermediate section into an essentially upright configuration rising above the top surface of the main body of the bag when no load is applied onto a top portion of the bag.
19 . The method according to claim 18 , wherein the intermediate section is reinforced by surrounding the intermediate section of each lifting strap with a flexible reinforcement tube.
20 . The method according to claim 19 , wherein the flexible reinforcement tubes are made of a flexible polymer or biopolymer material.
21 . The method according to claim 13 , wherein the step c) of connecting each terminal end of each sleeve to the intermediate section of the corresponding lifting strap includes providing each terminal end of the sleeves with a hem and surrounding part of the intermediate section of the associated lifting strap with the hem, thereby providing connection of the terminal ends of the sleeves to the main body of the bag via the lifting straps.
22 . The method according to claim 21 , wherein each hem is formed by folding and stitching a terminal portion at each terminal end of the sleeves.
23 . The method according to claim 22 , wherein the hem is not stitched to the intermediate section of the associated lifting strap.
24 . The method according to claim 21 , wherein each hem is formed such as to allow a relative movement of each hem with respect to the intermediate section of the associated lifting strap.
25 . The method according to claim 19 , wherein the step c) of connecting each terminal end of each sleeve to the intermediate section of the corresponding lifting strap includes providing each terminal end of the sleeves with a hem and surrounding part of the flexible reinforcement tube, and thus part of the intermediate section of the associated lifting strap, with the hem, thereby providing connection of the terminal ends of the sleeves to the main body of the bag via the lifting straps.
26 . The method according to claim 25 , wherein each hem is formed by folding and stitching a terminal portion at each terminal end of the sleeves.
27 . The method according to claim 26 , wherein the hem is not stitched to the intermediate section of the associated lifting strap.
28 . The method according to claim 25 , wherein each hem is formed such as to allow a relative movement of each hem with respect to the intermediate section of the associated lifting strap.
29 . The method according to claim 13 , further comprising the step of securing a bottom portion of each sleeve, at each terminal end of each sleeve, to the top surface of the main body of the bag.
30 . The method according to claim 13 , wherein the sleeves are made of a transparent or translucent material.
31 . The method according to claim 20 , wherein the flexible reinforcement tubes are made of polyvinyl chloride (PVC), polyethylene (PE), bio-polyethylene (bio-PE), polypropylene (PP), bio-polypropylene (bio-PP) or silicone.
32 . A bag for the transport and storage of bulk goods comprising a main body including at least a bottom part and four sides connected in pairs along adjacent edges to form vertical ridges at four corners of the bag,
wherein the bag further comprises four lifting straps, each comprising first and second end sections and an intermediate section rising above a top surface of the main body of the bag,
wherein the lifting straps are interconnected in pairs by two sleeves to form tubings or ducts extending longitudinally along the top surface of the main body of the bag to allow lifting of the bag by means of a forklift,
wherein terminal ends the sleeves are connected to the main body of the bag via the lifting straps,
wherein a longitudinal length of each sleeve, between the terminal ends, is not attached to the main body of the bag to form a longitudinal spacing between the sleeves and the main body,
wherein the first and second end sections of each lifting strap are secured to corresponding sides of the bag,
and wherein the terminal ends of the sleeves are each provided with a hem surrounding part of the intermediate section of the associated lifting strap and thereby provide connection of the terminal ends of the sleeves to the main body of the bag via the lifting straps.
33 . The bag according to claim 32 , wherein each hem is formed by folding and stitching a terminal portion at each terminal end of the sleeves.
34 . The bag according to claim 33 , wherein the hem is not stitched to the intermediate section of the associated lifting strap.
35 . The bag according to claim 32 , wherein each hem is configured to allow a relative movement of each hem with respect to the intermediate section of the associated lifting strap.