CA1112612A - Sack for storage and transport of bulk goods - Google Patents
Sack for storage and transport of bulk goodsInfo
- Publication number
- CA1112612A CA1112612A CA246,254A CA246254A CA1112612A CA 1112612 A CA1112612 A CA 1112612A CA 246254 A CA246254 A CA 246254A CA 1112612 A CA1112612 A CA 1112612A
- Authority
- CA
- Canada
- Prior art keywords
- sack
- fold line
- slit
- woven material
- lifting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Bag Frames (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
This invention relates to large sacks for bulk goods. The sack is made by double folding a single piece of woven material. The three unfolded sides are thereafter closed, and a slit-shaped opening is formed in the folded side.
Two lifting straps are provided which extend from the slit to the intersectional joint between imaginary extension lines of the side seams and the folded edge. The sack is easy to produce and when it is lashed, the material on either side of the filling opening forms two adjacent loops by which the sack can be lifted. Since the loops are integral with and identical to the material in the sack, a natural and uniform distribution of stretchstrains is ensured.
This invention relates to large sacks for bulk goods. The sack is made by double folding a single piece of woven material. The three unfolded sides are thereafter closed, and a slit-shaped opening is formed in the folded side.
Two lifting straps are provided which extend from the slit to the intersectional joint between imaginary extension lines of the side seams and the folded edge. The sack is easy to produce and when it is lashed, the material on either side of the filling opening forms two adjacent loops by which the sack can be lifted. Since the loops are integral with and identical to the material in the sack, a natural and uniform distribution of stretchstrains is ensured.
Description
~26~Z
The present invention relates -to an lmprovement in sacks for storage and transport of bulk goods, for example, road salt and artificial fertilizer for forestry and agricul-tural usage. Due to the constantly increasing costs in labour, attempts have been made in all fields to avoid manual handling of goods to the greatest possible extent and, in regard to artificial fertilizer, for example, attempts are made at avoid-ing units of 25 and 50 kg which are handled manually when a ;
fertiliæer spreader, which may take a ton, is -to be filled, and~any experiments have been made in the attempt to provide ~
sacks which can be filled with several hun~red kg and even ~ -tons of material to be transported or stored, and which can -be handled more rationally than smaller units. However, the ~ -embodiments known ~itherto have created more problems than they have solved. Even with requirements of both five-fold and seven-fold safety measures, it has proved that uneven distribution of the strains when the sack is hoisted can lead to rupturing of the sack and discharge of the contents at an undesired location, with subsequent trouble and con sumption of time and labour for collection, if collection is at all possible.
The previously known embodiments of sacks which take up to 1000 kilos and which are usually called "large-si~e sacks", -therefore, have been based on various ideas. One type of sack has two parallel runners at two opposing edges of the opening ~or suspension on a fork-like support. Another known type is provided with lifting straps which are welded to the exterior of the sack, however, in addition to the expense of this embodiment, there is little to ensure that the straps will remain so precisely in place that the lifting forces are uniformly distributed and not concentrated in ~2G~2 smaller areas where they can lead to strains which exceed the tearing strength of the material. Large sacks have also been effected in conventional manner and in the form of a conventional sack which is lashed and manually lashed around a rod or other lifting member. Since it is manual work, the lashing varies from sack to sack with consequent variations in the dist~ibution of strains. There are, of course, no problems attached to the production of sacks which, with a great degree of safety, can contain several tons if necessary; however, one requirement is also that the sack must be inexpensive enough to be disposed - of after a single use. Several of the above said -types of sacks are so expensive that they are used repeatedly, and the problem and cost of returning the sacks then arise and it is possible that they must be reconditioned before they can be refilled.
During the development of the sack according to the present invention, scale up to bags of the type described in United States patent No. 3,358,904 was also considered. However, .t was soon reali~ed that neither the design nor the material or production methods of such bags could be adapted -to the sack in question. Mere scale up of such bags would give sacks that not only would lack the necessary strength, but would also be unsuitable in other respects.
The present inven~ion provides a large size sack for the transport, lifting and storage of large quantities of free-flowing bulk materials, said large size sack comprising: a ~ ;
single piece of woven material formed of woven lengthwise strips and transverse strips; said single piece of woven material being folded in half alony a fold line extending transverse to said ~-lengthwise strips, thus fonning a sack top at said fold line and two overlapped sack panels having adjacent sack bottom edges extending paxallel to said fold line and parallel adjacent sackside edges e~tending transverse to said fold line between opposite ends of said bottom edges and said fold line; said adjacent sack bottom edges being closed to form a closed sack bottom; said adjacent sack side edges being sewn together from said sack bottom to positions spaced from said fold line to form two sack side seams, said side seams being spaced from said fold line to define therebetween two side openings; said sack panels having therein, at a location between said side edges thereof, a single longitudinal slit extending perpendicularly from said fold line and parallel to said side edges, said slit forming a sack filling opening; portions of said sack panels between said slit and said two side openings forming two lifting loops for lifting the sack, said lifting loops comprising unbroken integral elongations of said woven material of said sack panels; substantially all of said lé~gthwise strips of said woven material being continuous and unbroken by said slit, such that upon lifting the sack by ~.
said lifting loops, the critical stress along said lengthwise strips from said fold line to said sack bottom is evenly dis-tributed among all of said lengthwise strips; and said woven material having a sufficient size and strength such that -the sack can be filled with.a quantity of free-flowing bulk material of a weight of from several hundred kilograms to several tons without rupture of said material when the thus filled sack is lifted by said lifting loops.
The material in the folded edge on either side of the filling opening is thus an uninterrupted piece of material with-out score lines, and the sack can be carried by this material in that the side edges are provided with openings at the ends adjacent the folded edge. When such a sack is lashed, the `P -~t
The present invention relates -to an lmprovement in sacks for storage and transport of bulk goods, for example, road salt and artificial fertilizer for forestry and agricul-tural usage. Due to the constantly increasing costs in labour, attempts have been made in all fields to avoid manual handling of goods to the greatest possible extent and, in regard to artificial fertilizer, for example, attempts are made at avoid-ing units of 25 and 50 kg which are handled manually when a ;
fertiliæer spreader, which may take a ton, is -to be filled, and~any experiments have been made in the attempt to provide ~
sacks which can be filled with several hun~red kg and even ~ -tons of material to be transported or stored, and which can -be handled more rationally than smaller units. However, the ~ -embodiments known ~itherto have created more problems than they have solved. Even with requirements of both five-fold and seven-fold safety measures, it has proved that uneven distribution of the strains when the sack is hoisted can lead to rupturing of the sack and discharge of the contents at an undesired location, with subsequent trouble and con sumption of time and labour for collection, if collection is at all possible.
The previously known embodiments of sacks which take up to 1000 kilos and which are usually called "large-si~e sacks", -therefore, have been based on various ideas. One type of sack has two parallel runners at two opposing edges of the opening ~or suspension on a fork-like support. Another known type is provided with lifting straps which are welded to the exterior of the sack, however, in addition to the expense of this embodiment, there is little to ensure that the straps will remain so precisely in place that the lifting forces are uniformly distributed and not concentrated in ~2G~2 smaller areas where they can lead to strains which exceed the tearing strength of the material. Large sacks have also been effected in conventional manner and in the form of a conventional sack which is lashed and manually lashed around a rod or other lifting member. Since it is manual work, the lashing varies from sack to sack with consequent variations in the dist~ibution of strains. There are, of course, no problems attached to the production of sacks which, with a great degree of safety, can contain several tons if necessary; however, one requirement is also that the sack must be inexpensive enough to be disposed - of after a single use. Several of the above said -types of sacks are so expensive that they are used repeatedly, and the problem and cost of returning the sacks then arise and it is possible that they must be reconditioned before they can be refilled.
During the development of the sack according to the present invention, scale up to bags of the type described in United States patent No. 3,358,904 was also considered. However, .t was soon reali~ed that neither the design nor the material or production methods of such bags could be adapted -to the sack in question. Mere scale up of such bags would give sacks that not only would lack the necessary strength, but would also be unsuitable in other respects.
The present inven~ion provides a large size sack for the transport, lifting and storage of large quantities of free-flowing bulk materials, said large size sack comprising: a ~ ;
single piece of woven material formed of woven lengthwise strips and transverse strips; said single piece of woven material being folded in half alony a fold line extending transverse to said ~-lengthwise strips, thus fonning a sack top at said fold line and two overlapped sack panels having adjacent sack bottom edges extending paxallel to said fold line and parallel adjacent sackside edges e~tending transverse to said fold line between opposite ends of said bottom edges and said fold line; said adjacent sack bottom edges being closed to form a closed sack bottom; said adjacent sack side edges being sewn together from said sack bottom to positions spaced from said fold line to form two sack side seams, said side seams being spaced from said fold line to define therebetween two side openings; said sack panels having therein, at a location between said side edges thereof, a single longitudinal slit extending perpendicularly from said fold line and parallel to said side edges, said slit forming a sack filling opening; portions of said sack panels between said slit and said two side openings forming two lifting loops for lifting the sack, said lifting loops comprising unbroken integral elongations of said woven material of said sack panels; substantially all of said lé~gthwise strips of said woven material being continuous and unbroken by said slit, such that upon lifting the sack by ~.
said lifting loops, the critical stress along said lengthwise strips from said fold line to said sack bottom is evenly dis-tributed among all of said lengthwise strips; and said woven material having a sufficient size and strength such that -the sack can be filled with.a quantity of free-flowing bulk material of a weight of from several hundred kilograms to several tons without rupture of said material when the thus filled sack is lifted by said lifting loops.
The material in the folded edge on either side of the filling opening is thus an uninterrupted piece of material with-out score lines, and the sack can be carried by this material in that the side edges are provided with openings at the ends adjacent the folded edge. When such a sack is lashed, the `P -~t
2~æ
material on either side of the filling opening forms two ad-jacent loops b~ which the sack can be lifted and, inasmuch as the loops are integral with and identical to the material in the sack otherwise, a natural and uniEorm distribution of the stretch strains in the material of the sack is ensured, whereby an economical utilization of the sack is obtained even with great demands to safety. The sack is further very simple to produce from for example, a textile of polypropylene laid double and sewn along the side edges on already existing machines, the filling opening being formed by a single slit inwardly from the folded and unsewn edge. The sack is then provided with a closed bottom, for example also by sewing. sy terminating the seams at a distance from the folded edge, the openings necessary for forma- -tion of the said loops when the sack is lashed are provided. ;
In use of the sack, a lashin~ element is preferably ~`
tied around the woven material adjacent and below the end of the slit remote from said fold line to close the sack and permit the sack to be lifted by the two lifting loops.
By way of example, a specific embodiment in accordance with the invention will now be described, with reference to the accompanying drawings in which: ~ ~
Figures 1 - 7 illustrate the steps of forming a sack ~ -from a flat piece of suitable material to a filled and lashed sack ready for storage and transport.
Figure 1 illustrates a material piece of, for example, polypropylene textile 1 and this piece is folded at its centre line 2. It then has the shape illustrated in Figure 2 with a folded edge 3 at the top and free edges 4 and 5. The free edges ~ -4 and 5 are, in the example, illustrated, sewn together by seams 6 so that the sack is formed. The seams 4 on both sides ;i 6~2 terminate at the arrow 7 so that, above the said seam, openings 8 are produced. As filling opening, the sack in Eigure 3 is provided with a slit 9 through both layers of the material and directed lengthwise of the sack from khe folded edge 3. When the sack is filled, it is disposed on a base layer and suspended, as illustrated in Figure 4, so that the slit opens and the sack can be filled therethrough as indicated by the arrow 10. During the filling operation, the sack may be suspended in any expedient manner and, subsequent to fillin~, it stands by itself on the lO base layer and the upper part is drawn together as illustrated in Figure 5. The sack is now to be lashed in that around the upper end, a rope ll is knotted so far down that the slit 9 is closed and so that, above the rope ll (Figures 6 and 7) two r adjacent loops 12 are formed from the parts of the material of the sack located on either side of the slit 9, and including the openings 8 The sack can now be hoisted by means of the loops 13 for transport and, as explained, the distribution of force is uniform since the material in the sack and in the loops is the 20 same, and there will be no variation from sack to sack. The sack is further so inexpensive that it can be disposed of after a single use.
The sack may comprise one or more layers and have an inner sack which is closed per se when necessary. The outer sack which actually carries the weight, is made from a textile of fibrous material e.g. woven polypropylene or the like. The inner sack can be made from a cheap and not necessarily strong material as polyethylene, paper or the like. Furthermore, in place of the simple embodiment illustrated in the drawings, the sack may be 30 provided with insertions in the sides thereof when desired.
~hl~
As an alternative or complementary device to the application of the above mentioned inner sack, the sack may be provided with an inner lid made of plastic sheeting or woven material. The lid is fastened to the inside of the sack and may have the form of a hose with the same diameter as the sack.
The lid may also comprise a circular or cone formed sheet ex-tending in a neck of suitable diameter. The lid is closed by lashing. When filling the sack, the lid's neck is connected to the filling tube and the sack can be blown up with air before filling~
Other embodiments of the invention will be readily apparent to a person skilled in the art, the scope of the invention being defined in the appended claims. -~
~ '
material on either side of the filling opening forms two ad-jacent loops b~ which the sack can be lifted and, inasmuch as the loops are integral with and identical to the material in the sack otherwise, a natural and uniEorm distribution of the stretch strains in the material of the sack is ensured, whereby an economical utilization of the sack is obtained even with great demands to safety. The sack is further very simple to produce from for example, a textile of polypropylene laid double and sewn along the side edges on already existing machines, the filling opening being formed by a single slit inwardly from the folded and unsewn edge. The sack is then provided with a closed bottom, for example also by sewing. sy terminating the seams at a distance from the folded edge, the openings necessary for forma- -tion of the said loops when the sack is lashed are provided. ;
In use of the sack, a lashin~ element is preferably ~`
tied around the woven material adjacent and below the end of the slit remote from said fold line to close the sack and permit the sack to be lifted by the two lifting loops.
By way of example, a specific embodiment in accordance with the invention will now be described, with reference to the accompanying drawings in which: ~ ~
Figures 1 - 7 illustrate the steps of forming a sack ~ -from a flat piece of suitable material to a filled and lashed sack ready for storage and transport.
Figure 1 illustrates a material piece of, for example, polypropylene textile 1 and this piece is folded at its centre line 2. It then has the shape illustrated in Figure 2 with a folded edge 3 at the top and free edges 4 and 5. The free edges ~ -4 and 5 are, in the example, illustrated, sewn together by seams 6 so that the sack is formed. The seams 4 on both sides ;i 6~2 terminate at the arrow 7 so that, above the said seam, openings 8 are produced. As filling opening, the sack in Eigure 3 is provided with a slit 9 through both layers of the material and directed lengthwise of the sack from khe folded edge 3. When the sack is filled, it is disposed on a base layer and suspended, as illustrated in Figure 4, so that the slit opens and the sack can be filled therethrough as indicated by the arrow 10. During the filling operation, the sack may be suspended in any expedient manner and, subsequent to fillin~, it stands by itself on the lO base layer and the upper part is drawn together as illustrated in Figure 5. The sack is now to be lashed in that around the upper end, a rope ll is knotted so far down that the slit 9 is closed and so that, above the rope ll (Figures 6 and 7) two r adjacent loops 12 are formed from the parts of the material of the sack located on either side of the slit 9, and including the openings 8 The sack can now be hoisted by means of the loops 13 for transport and, as explained, the distribution of force is uniform since the material in the sack and in the loops is the 20 same, and there will be no variation from sack to sack. The sack is further so inexpensive that it can be disposed of after a single use.
The sack may comprise one or more layers and have an inner sack which is closed per se when necessary. The outer sack which actually carries the weight, is made from a textile of fibrous material e.g. woven polypropylene or the like. The inner sack can be made from a cheap and not necessarily strong material as polyethylene, paper or the like. Furthermore, in place of the simple embodiment illustrated in the drawings, the sack may be 30 provided with insertions in the sides thereof when desired.
~hl~
As an alternative or complementary device to the application of the above mentioned inner sack, the sack may be provided with an inner lid made of plastic sheeting or woven material. The lid is fastened to the inside of the sack and may have the form of a hose with the same diameter as the sack.
The lid may also comprise a circular or cone formed sheet ex-tending in a neck of suitable diameter. The lid is closed by lashing. When filling the sack, the lid's neck is connected to the filling tube and the sack can be blown up with air before filling~
Other embodiments of the invention will be readily apparent to a person skilled in the art, the scope of the invention being defined in the appended claims. -~
~ '
Claims (4)
1. A large size sack for the transport, lifting and storage of large quantities of free-flowing bulk materials, said large size sack comprising:
a single piece of woven material formed of woven lengthwise strips and transverse strips;
said single piece of woven material being folded in half along a fold line extending transverse to said lengthwise strips, thus forming a sack top at said fold line and two over-lapped sack panels having adjacent sack bottom edges extending parallel to said fold line and parallel adjacent sack side edges extending transverse to said fold line between opposite ends of said bottom edges and said fold line;
said adjacent sack bottom edges being closed to form a closed sack bottom;
said adjacent sack side edges being sewn together from said sack bottom to positions spaced from said fold line to form two sack side seams, said side seams being spaced from said fold line to define therebetween two side openings;
said sack panels having therein, at a location between said side edges thereof, a single longitudinal slit extending perpendicularly from said fold line and parallel to said side edges, said slit forming a sack filling opening;
portions of said sack panels between said slit and said two side openings forming two lifting loops for lifting the sack, said lifting loops comprising unbroken integral elongations of said woven material of said sack panels;
substantially all of said lengthwise strips of said woven material being continuous and unbroken by said slit, such that upon lifting the sack by said lifting loops, the critical stress along said lengthwise strips from said fold line to said sack bottom is evenly distributed among all of said lengthwise strips; and said woven material having a sufficient size and strength such that the sack can be filled with a quantity of free-flowing bulk material of a weight of from several hundred kilograms to several tons without rupture of said material when the thus filled sack is lifted by said lifting loops.
a single piece of woven material formed of woven lengthwise strips and transverse strips;
said single piece of woven material being folded in half along a fold line extending transverse to said lengthwise strips, thus forming a sack top at said fold line and two over-lapped sack panels having adjacent sack bottom edges extending parallel to said fold line and parallel adjacent sack side edges extending transverse to said fold line between opposite ends of said bottom edges and said fold line;
said adjacent sack bottom edges being closed to form a closed sack bottom;
said adjacent sack side edges being sewn together from said sack bottom to positions spaced from said fold line to form two sack side seams, said side seams being spaced from said fold line to define therebetween two side openings;
said sack panels having therein, at a location between said side edges thereof, a single longitudinal slit extending perpendicularly from said fold line and parallel to said side edges, said slit forming a sack filling opening;
portions of said sack panels between said slit and said two side openings forming two lifting loops for lifting the sack, said lifting loops comprising unbroken integral elongations of said woven material of said sack panels;
substantially all of said lengthwise strips of said woven material being continuous and unbroken by said slit, such that upon lifting the sack by said lifting loops, the critical stress along said lengthwise strips from said fold line to said sack bottom is evenly distributed among all of said lengthwise strips; and said woven material having a sufficient size and strength such that the sack can be filled with a quantity of free-flowing bulk material of a weight of from several hundred kilograms to several tons without rupture of said material when the thus filled sack is lifted by said lifting loops.
2. A sack according to claim 1 wherein said adjacent sack bottom edges are sewn together to form the closed sack bottom.
3. A sack according to claim 1 wherein the woven material is a textile of polypropylene.
4. A sack according to claim 1 including a lashing element tied around the woven material adjacent and below the end of the slit remote from said fold line to close the sack and permit the sack to be lifted by the two lifting loops.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA246,254A CA1112612A (en) | 1976-02-20 | 1976-02-20 | Sack for storage and transport of bulk goods |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA246,254A CA1112612A (en) | 1976-02-20 | 1976-02-20 | Sack for storage and transport of bulk goods |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1112612A true CA1112612A (en) | 1981-11-17 |
Family
ID=4105287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA246,254A Expired CA1112612A (en) | 1976-02-20 | 1976-02-20 | Sack for storage and transport of bulk goods |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1112612A (en) |
-
1976
- 1976-02-20 CA CA246,254A patent/CA1112612A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |