EP0000838A1 - Flexible bulk container - Google Patents
Flexible bulk container Download PDFInfo
- Publication number
- EP0000838A1 EP0000838A1 EP7878300256A EP78300256A EP0000838A1 EP 0000838 A1 EP0000838 A1 EP 0000838A1 EP 7878300256 A EP7878300256 A EP 7878300256A EP 78300256 A EP78300256 A EP 78300256A EP 0000838 A1 EP0000838 A1 EP 0000838A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- warp
- container
- fabric
- strength
- regions
- 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.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/16—Large containers flexible
- B65D88/1612—Flexible intermediate bulk containers [FIBC]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/16—Large containers flexible
- B65D88/1612—Flexible intermediate bulk containers [FIBC]
- B65D88/1675—Lifting fittings
- B65D88/1681—Flexible, e.g. loops, or reinforcements therefor
Definitions
- This invention relates to a flexible bulk container.
- Such containers may be used in the storage and transport of materials in granular, powder and other particulate form, such as chemicals, foodstuffs, cement and so forth.
- the containers are generally in the form of large bags or sacks. They are often required to carry loads of up to one tonne or more, and there should desirably be a considerable safety margin above this working load.
- the containers are frequently made from woven fabric, for example woven polypropylene or another suitable synthetic material.
- woven fabric for example woven polypropylene or another suitable synthetic material.
- lifting loops or the like may similarly become regions of high stress concentration.
- the object of the invention is to provide a container in which reinforcement can be obtained in a simple yet effective manner.
- a flexible bulk container of woven fabric having at least one region of a fabric portion which is reinforced, characterised in that the strength of the warp per unit width in said region is greater than that over at least the major part of the remainder of the portion.
- reinforcement is inherent in the woven fabric.
- the higher warp strength region can be woven integrally with the remainder of the fabric.
- the higher warp strength region could for example be adjacent a seam between two fabric portions.
- the container may be made from a plurality of fabric panels or from a single strip of fabric suitably folded, different parts of which constitute fabric portions. 10 is generally desirable that higher warp strength regions are provided adjacent both selvedges of a fabric panel or strip.
- the container may be designed so that as many of its seams as possible extend along selvedges, or at least those seams which will be subjected to the highest stress concentration in use.
- the panels may be joined to one another along their selvedges to form an open top bag-like structure with the seamed selvedges extending generally vertically.
- One such construction may comprise three portions, one of which is U-shaped, the other two being connected across the ends of the U-shaped portion, the curved bight of which forms the bottom of the container.
- Joining of fabric portions may be by any suitable means such as welding or stitching.
- stitching may be applied as a continuous helix, each convolution penetrating the higher warp strength regions.
- parallel rows of stitching can be inserted through the higher warp strength regions.
- the higher warp strength regions adjacent seams not only improve the resistance to tearing of the fabric but also provide suitably reinforced regions for lifting means, such as fabric loops, to be attached to the container. These may be stitched or otherwise fastened to the regions of higher warp strength. This may be particularly advantageous in constructions where the selvedges and hence the higher warp strength regions extend generally vertically, since the stresses of lifting the container by the loops or the like can be borne largely by these stronger regions.
- regions adjacent seams provide suitable points of attachment for lifting means such as loops or the like
- regions of higher warp strength could be provided between the selvedges, for example in the middle of a panel portion, so as to facilitate the attachment of lifting loops, straps and so on, at locations other than adjacent seams.
- Such positioning of higher warp strength regions independently of seams is itself advantageous, and is applicable to a container having no suitable seams, for example, a container having a seamless main body portion.
- Such a container may comprise a main body portion in the form of a seamless tube the warp threads of which are parallel to the axis of the tube, the regions of higher strength warp being spaced around the periphery of the tube, the tube being closed at one end and lifting means such as loops being fastened at the other end of the tube to the higher strength warp regions.
- Lifting loops for example may be fastened to the body portion by attaching the ends of the strips of loop material to radially projecting flanges on the body portion formed by pinching together the regions of the body portion with higher warp strength, the loop ends being attached to the opposite outside faces of the pinched portions.
- opposite ends of a strip of material to form a loop may be fastened to the inside and the outside surfaces of the body portion.
- the body portion may be closed at the bottom end by fitting a circular bottom piece to the body portion and attaching it thereto e.g. by stitching the sides together.
- the body member presents no longitudinal seams which would be weak points, and is simple to form due to the reduced number of sewing operations.
- the higher strength warp regions could be provided by using a higher density of warp threads, by using higher tenacity warp threads, or by a combination of the two.
- Warp threads of lower tenacity may be formed as flat polypropylene tape, and those of higher tenacity as twisted polypropylene tap, R.E.F. (roll embossed film) yarns or high tenacity multi-filament yarns.
- the higher tenacity threads are e.g. R.E.F. polypropylene yarns or circular cross-section filaments.
- the two types of thread may be of different materials, for example the lower tenacity threads being of polypropylene and the higher tenacity threads of polyester or nylon.
- Woven fabric for use in constructing the container may for example be in the form of a strip having stronger warp regions adjacent each selvedge, or elsewhere as appropriate, or for example in the form of a tube woven on a circular loom, with suitable regions of higher strength warp.
- the stronger warp regions may be employed to provide reinforcement along other lines of stress.
- Fig. 1 there is shown a flexible bulk container for carrying up to 1 tonne of material, possible with a safety factor of at least five times this weight.
- the container includes a bag portion l,to which are attached four lifting loops 2.
- the bag is of woven fabric, for example, woven polypropylene although polyethylene tetraphthalate, rayon,nylon and so forth could be used.
- a preferred fabric construction is 5.9x4.7 threads per cm woven polypropylene tape of 222.2 tex.
- the fabric may be sealed by a coating of polypropylene or by laminated polyethylene.
- the loops 2 are preferably webbing e.g. woven polyethylene tetraphthalate approximately 5 cm wide.
- the bag 1 comprises three pieces of fabric, namely a substantially "U"-shaped portion 3, forming two sides and the base of the bag, and two rectangular pieces 4 and 5 forming the other two sides of the bag.
- the fabric pieces are arranged with their warp threads running vertically up the sides of the bag.
- the pieces are joined by stitching along seams, e.g. a blanket stitch using polypropylene yarn.
- the selvedges of the fabric pieces 3, 4 and 5 run vertically along the seams, apart from at the base of the bag.
- Stitching 6 is provided around the top of the bag, to prevent fraying of the fabric.
- the seam construction and method of attachment of the loops to the bag is shown more clearly in Fig. 2.
- the two pieces of fabric 3 and 4 are stitched together along seam 7, by polypropylene yarn 8.
- the loop 2 has two legs 9 and 10.
- the fabric adjacent the seam 7 is pinched together, to form a flange, and the legs 9 and.10 are stitched to the flange, straddling it. Each stitch passes through the legs 9 and 10 of the loop and the two thicknesses of bag fabric.
- the weft threads are turned back, for example a distance of 1.27 cm. This can provide a degree of reinforcement adjacent the seam. Additionally however, and in accordance with the invention, strengthening is obtained by means of a higher strength density of warp threads. For example, in regions generally marked 11 and 12, adjacent the selvedge of fabric pieces 3 and 4 respectively, there is a higher density of warp threads, i.e. the threads are packed closer together, and/or warp threads of higher tenacity. Thus, over the majority of the bag, the warp threads could be polypropylene tape having a tenacity of perhaps 353.2 to 529.8 mN tex -1 .
- the warp threads could be polypropylene R.E.F. yarns having a tenacity of 44105 to 618.1 mN tex -1 or multi-filament polypropylene yarns.
- the widths of the regions 11 and 12 are such as to accommodate the legs of the loop, and they run the length of the selvedges.
- Fig. 3 there is shown another embodiment of the invention, in which the container comprises a one-piece, tubular main body portion 13, to which is stitched a circular base 14.
- the container comprises a one-piece, tubular main body portion 13, to which is stitched a circular base 14.
- Four loops 2 are attached to the top of the bag, spaced equidistantly around it.
- the bag fabric is pinched to form a flange adjacent the top of the bag.
- the legs of the loop straddle the flange and are stitched thereto as in the previous embodiment.
- the points of attachment of the loops 2 are in regions 15 of higher strength density warp threads, the warps threads extending vertically up the bag.
- the higher strength density may be obtained as described earlier.
- the bag is similar in construction to those described earlier.
- R.E.F. yarns with a "cramming" effect, in the regions adjacent the selvedges.
- R.E.F. polypropylene warp yarns are woven in pairs; to assist in the weaving process it is then advantageous for the warp yarns to pass over and under two weft threads at a time.
- the resultant container has a considerably improved strength, and is capable of carrying up to between 8 and 10 tonnes.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bag Frames (AREA)
- Woven Fabrics (AREA)
Abstract
Description
- This invention relates to a flexible bulk container.
- Such containers may be used in the storage and transport of materials in granular, powder and other particulate form, such as chemicals, foodstuffs, cement and so forth. The containers are generally in the form of large bags or sacks. They are often required to carry loads of up to one tonne or more, and there should desirably be a considerable safety margin above this working load.
- The containers are frequently made from woven fabric, for example woven polypropylene or another suitable synthetic material. In many instances there will be seams between adjacent portions of the container and it has been found that in use these can become regions of high stress concentration so that there is an increased tendency of the fabric to tear adjacent the seams. It is also known to attach lifting loops or the like to the main body of the container, and the points of attachment may similarly become regions of high stress concentration.
- Various methods have been proposed for reinforcing a container in regions of potentially high stress concentrations, but many of these proposals involve the use of additional reinforcing material and an increased number of manufacturing steps. This may increase the time and cost of production, which can be undesirable, particularly if the containers are intended to be disposable. The object of the invention is to provide a container in which reinforcement can be obtained in a simple yet effective manner.
- According to the invention there is provided a flexible bulk container of woven fabric having at least one region of a fabric portion which is reinforced, characterised in that the strength of the warp per unit width in said region is greater than that over at least the major part of the remainder of the portion. In this manner, reinforcement is inherent in the woven fabric. The higher warp strength region can be woven integrally with the remainder of the fabric.
- The higher warp strength region could for example be adjacent a seam between two fabric portions. Thus, there may be a seam along a selvedge of a fabric portion, the higher warp strength region being adjacent the selvedge.
- In a construction where the fabric portion is joined to another portion of stronger material which needs no additional strength near the seam, only one fabric portion need have the higher warp strength region adjacent its selvedge. In many cases, however, there will be seams between the selvedges of portions of like fabric, and each portion will have a higher warp strength region adjacent its selvedge.
- The container may be made from a plurality of fabric panels or from a single strip of fabric suitably folded, different parts of which constitute fabric portions. 10 is generally desirable that higher warp strength regions are provided adjacent both selvedges of a fabric panel or strip.
- Advantageously, the container may be designed so that as many of its seams as possible extend along selvedges, or at least those seams which will be subjected to the highest stress concentration in use.
- In a construction employing a plurality of fabric panels, which for ease of manufacture may be of constant width, the panels may be joined to one another along their selvedges to form an open top bag-like structure with the seamed selvedges extending generally vertically. One such construction may comprise three portions, one of which is U-shaped, the other two being connected across the ends of the U-shaped portion, the curved bight of which forms the bottom of the container.
- Joining of fabric portions may be by any suitable means such as welding or stitching. For example, stitching may be applied as a continuous helix, each convolution penetrating the higher warp strength regions. Alternatively, parallel rows of stitching can be inserted through the higher warp strength regions.
- The higher warp strength regions adjacent seams not only improve the resistance to tearing of the fabric but also provide suitably reinforced regions for lifting means, such as fabric loops, to be attached to the container. These may be stitched or otherwise fastened to the regions of higher warp strength. This may be particularly advantageous in constructions where the selvedges and hence the higher warp strength regions extend generally vertically, since the stresses of lifting the container by the loops or the like can be borne largely by these stronger regions.
- Although in the container described above the higher warp strength regions adjacent seams provide suitable points of attachment for lifting means such as loops or the like, regions of higher warp strength could be provided between the selvedges, for example in the middle of a panel portion, so as to facilitate the attachment of lifting loops, straps and so on, at locations other than adjacent seams.
- Such positioning of higher warp strength regions independently of seams is itself advantageous, and is applicable to a container having no suitable seams, for example, a container having a seamless main body portion.
- Such a container may comprise a main body portion in the form of a seamless tube the warp threads of which are parallel to the axis of the tube, the regions of higher strength warp being spaced around the periphery of the tube, the tube being closed at one end and lifting means such as loops being fastened at the other end of the tube to the higher strength warp regions.
- Lifting loops for example may be fastened to the body portion by attaching the ends of the strips of loop material to radially projecting flanges on the body portion formed by pinching together the regions of the body portion with higher warp strength, the loop ends being attached to the opposite outside faces of the pinched portions. Alternatively opposite ends of a strip of material to form a loop may be fastened to the inside and the outside surfaces of the body portion.
- The body portion may be closed at the bottom end by fitting a circular bottom piece to the body portion and attaching it thereto e.g. by stitching the sides together.
- The body member presents no longitudinal seams which would be weak points, and is simple to form due to the reduced number of sewing operations.
- The higher strength warp regions could be provided by using a higher density of warp threads, by using higher tenacity warp threads, or by a combination of the two. Warp threads of lower tenacity may be formed as flat polypropylene tape, and those of higher tenacity as twisted polypropylene tap, R.E.F. (roll embossed film) yarns or high tenacity multi-filament yarns. In a preferred construction, whilst the lower tenacity threads are flat tape, the higher tenacity threads are e.g. R.E.F. polypropylene yarns or circular cross-section filaments. The two types of thread may be of different materials, for example the lower tenacity threads being of polypropylene and the higher tenacity threads of polyester or nylon.
- It will be appreciated that by means of the suitable disposition of higher warp strength regions, it is possible to provide reinforcement adjacent a seam or the point of attachment of lifting means such as a loop, by means which are inherent in the production of the fabric of the container, rather than the design of the container itself. Of course, for additional strength, it is possible to combine the use of higher warp strength regions with other means of reinforcement, improved seam constructions and so forth.
- Woven fabric for use in constructing the container may for example be in the form of a strip having stronger warp regions adjacent each selvedge, or elsewhere as appropriate, or for example in the form of a tube woven on a circular loom, with suitable regions of higher strength warp.
- Aside from reinforcing seams or points of attachment for lifting loops or the like, the stronger warp regions may be employed to provide reinforcement along other lines of stress.
- Two embodiments of the invention will now be described by way of example and with reference to the accompanying drawings in which:-
- Fig. 1 is a perspective view of a container in accordance with the invention;
- Fig. 2 is a view of part of the seam between two fabric panels in the container; and
- Fig. 3 is a perspective view of a second embodiment of a container in accordance with the invention.
- Referring now to the drawings, in Fig. 1 there is shown a flexible bulk container for carrying up to 1 tonne of material, possible with a safety factor of at least five times this weight. The container includes a bag portion l,to which are attached four
lifting loops 2. - The bag is of woven fabric, for example, woven polypropylene although polyethylene tetraphthalate, rayon,nylon and so forth could be used. A preferred fabric construction is 5.9x4.7 threads per cm woven polypropylene tape of 222.2 tex. The fabric may be sealed by a coating of polypropylene or by laminated polyethylene.
- The
loops 2 are preferably webbing e.g. woven polyethylene tetraphthalate approximately 5 cm wide. - The bag 1 comprises three pieces of fabric, namely a substantially "U"-
shaped portion 3, forming two sides and the base of the bag, and tworectangular pieces 4 and 5 forming the other two sides of the bag. The fabric pieces are arranged with their warp threads running vertically up the sides of the bag. The pieces are joined by stitching along seams, e.g. a blanket stitch using polypropylene yarn. The selvedges of thefabric pieces fabric seam 7, bypolypropylene yarn 8. - The
loop 2 has twolegs 9 and 10. The fabric adjacent theseam 7 is pinched together, to form a flange, and the legs 9 and.10 are stitched to the flange, straddling it. Each stitch passes through thelegs 9 and 10 of the loop and the two thicknesses of bag fabric. - Although not shown, adjacent the selvedge of the fabric pieces the weft threads are turned back, for example a distance of 1.27 cm. This can provide a degree of reinforcement adjacent the seam. Additionally however, and in accordance with the invention, strengthening is obtained by means of a higher strength density of warp threads. For example, in regions generally marked 11 and 12, adjacent the selvedge of
fabric pieces regions - In Fig. 3, there is shown another embodiment of the invention, in which the container comprises a one-piece, tubular
main body portion 13, to which is stitched acircular base 14. Fourloops 2 are attached to the top of the bag, spaced equidistantly around it. At the point of attachment of aloop 2, the bag fabric is pinched to form a flange adjacent the top of the bag. The legs of the loop straddle the flange and are stitched thereto as in the previous embodiment. - The points of attachment of the
loops 2 are inregions 15 of higher strength density warp threads, the warps threads extending vertically up the bag. The higher strength density may be obtained as described earlier. In other respects, for example regarding the materials used, the bag is similar in construction to those described earlier. - It will thus be seen that there is provided a container which, whilst simple in construction, has improved strength and reliability, and in which lifting stresses, when the container is lifted by the loops, are transmitted down the container by reinforced regions. The method by which the fabric of the bag is manufactured, and the bag is constructed, allow for greater productivity.
- We have found that a particularly advantageous arrangement combines the use of R.E.F. yarns with a "cramming" effect, in the regions adjacent the selvedges. Thus R.E.F. polypropylene warp yarns are woven in pairs; to assist in the weaving process it is then advantageous for the warp yarns to pass over and under two weft threads at a time. The resultant container has a considerably improved strength, and is capable of carrying up to between 8 and 10 tonnes.
Claims (7)
Applications Claiming Priority (12)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3307677 | 1977-08-06 | ||
GB3307677 | 1977-08-06 | ||
GB3605177 | 1977-08-26 | ||
GB3605177 | 1977-08-26 | ||
GB4817977 | 1977-11-18 | ||
GB4817977 | 1977-11-18 | ||
GB2579978 | 1978-05-31 | ||
GB2579878 | 1978-05-31 | ||
GB2580078 | 1978-05-31 | ||
GB2579978 | 1978-05-31 | ||
GB2579878A GB1604212A (en) | 1978-05-31 | 1978-05-31 | Flexible containers |
GB2580078 | 1978-05-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0000838A1 true EP0000838A1 (en) | 1979-02-21 |
EP0000838B1 EP0000838B1 (en) | 1981-12-23 |
Family
ID=27546702
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP78300256A Expired EP0000838B1 (en) | 1977-08-06 | 1978-08-07 | Flexible bulk container |
Country Status (7)
Country | Link |
---|---|
US (1) | US4207937A (en) |
EP (1) | EP0000838B1 (en) |
AT (1) | AT382582B (en) |
CA (1) | CA1095470A (en) |
DE (1) | DE2861452D1 (en) |
FI (1) | FI61169C (en) |
PT (1) | PT68389A (en) |
Cited By (7)
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US5518314A (en) * | 1993-06-30 | 1996-05-21 | Morishita Chemical Industry Co., Ltd. | Flexible container |
GB2495336A (en) * | 2011-10-07 | 2013-04-10 | Joey Short | Impermeable cover for stacked building materials |
EP3257991A1 (en) * | 2016-06-17 | 2017-12-20 | Codefine S.A. | Method for production of bags for the transport and storage of bulk goods or liquids, and bag obtained according to the method |
WO2017216742A1 (en) * | 2016-06-17 | 2017-12-21 | Codefine S.A. | Method for production of bags for the transport and storage of bulk goods or liquids, and bag obtained according to the method |
EP3524540A1 (en) * | 2018-02-07 | 2019-08-14 | Codefine S. A. | Bag for the transport and storage of bulk goods |
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NL7714539A (en) * | 1977-01-10 | 1978-07-12 | Miller Weblift Ltd | METHOD FOR MANUFACTURING A FLEXIBLE BAG AND FLEXIBLE BAG OBTAINED BY THIS METHOD |
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US4010784A (en) * | 1973-03-04 | 1977-03-08 | Frank Nattrass | Bulk containers |
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- 1978-08-03 US US05/930,783 patent/US4207937A/en not_active Expired - Lifetime
- 1978-08-04 FI FI782410A patent/FI61169C/en not_active IP Right Cessation
- 1978-08-04 AT AT0567278A patent/AT382582B/en active
- 1978-08-04 PT PT68389A patent/PT68389A/en unknown
- 1978-08-04 CA CA308,746A patent/CA1095470A/en not_active Expired
- 1978-08-07 EP EP78300256A patent/EP0000838B1/en not_active Expired
- 1978-08-07 DE DE7878300256T patent/DE2861452D1/en not_active Expired
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FR723764A (en) * | 1931-10-01 | 1932-04-14 | Filatures Et Tissages De Marse | Method of reinforcing jute or other cloths for the preparation of folded bags and other applications |
NL7714539A (en) * | 1977-01-10 | 1978-07-12 | Miller Weblift Ltd | METHOD FOR MANUFACTURING A FLEXIBLE BAG AND FLEXIBLE BAG OBTAINED BY THIS METHOD |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2643343A2 (en) * | 1988-01-06 | 1990-08-24 | Bellehchili Riadh | Rubbish sack |
US5518314A (en) * | 1993-06-30 | 1996-05-21 | Morishita Chemical Industry Co., Ltd. | Flexible container |
AU682487B2 (en) * | 1993-06-30 | 1997-10-09 | Morishita Chemical Industry Co., Ltd. | Flexible container |
GB2495336A (en) * | 2011-10-07 | 2013-04-10 | Joey Short | Impermeable cover for stacked building materials |
EP3257991A1 (en) * | 2016-06-17 | 2017-12-20 | Codefine S.A. | Method for production of bags for the transport and storage of bulk goods or liquids, and bag obtained according to the method |
WO2017216742A1 (en) * | 2016-06-17 | 2017-12-21 | Codefine S.A. | Method for production of bags for the transport and storage of bulk goods or liquids, and bag obtained according to the method |
US10550502B2 (en) | 2016-06-17 | 2020-02-04 | Codefine S.A. | Method for production of bags for the transport and storage of bulk goods or liquids |
US11091863B2 (en) | 2016-06-17 | 2021-08-17 | Codefine International Sa | Bags for the transport and storage of bulk goods or liquids |
EP3524540A1 (en) * | 2018-02-07 | 2019-08-14 | Codefine S. A. | Bag for the transport and storage of bulk goods |
WO2019155330A1 (en) | 2018-02-07 | 2019-08-15 | Codefine S.A. | Bag for the transport and storage of bulk goods |
FR3107041A1 (en) * | 2020-02-11 | 2021-08-13 | Linerbenne | Flexible container for packaging waste |
WO2021160565A1 (en) * | 2020-02-11 | 2021-08-19 | Linerbenne | Flexible container for conditioning waste |
Also Published As
Publication number | Publication date |
---|---|
US4207937A (en) | 1980-06-17 |
FI61169B (en) | 1982-02-26 |
PT68389A (en) | 1978-09-01 |
ATA567278A (en) | 1986-08-15 |
CA1095470A (en) | 1981-02-10 |
FI61169C (en) | 1982-06-10 |
FI782410A (en) | 1979-02-07 |
AT382582B (en) | 1987-03-10 |
DE2861452D1 (en) | 1982-02-11 |
EP0000838B1 (en) | 1981-12-23 |
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