EP0571458B1 - Flexibler Behälter - Google Patents

Flexibler Behälter Download PDF

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Publication number
EP0571458B1
EP0571458B1 EP92904596A EP92904596A EP0571458B1 EP 0571458 B1 EP0571458 B1 EP 0571458B1 EP 92904596 A EP92904596 A EP 92904596A EP 92904596 A EP92904596 A EP 92904596A EP 0571458 B1 EP0571458 B1 EP 0571458B1
Authority
EP
European Patent Office
Prior art keywords
container
flaps
loop
loops
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 - Lifetime
Application number
EP92904596A
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English (en)
French (fr)
Other versions
EP0571458A1 (de
Inventor
Jeffrey Robin Caldwell-Nichols
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AgriTay (Holdings) Ltd
Original Assignee
AgriTay (Holdings) Ltd
AGRITAY HOLDINGS Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from GB919103792A external-priority patent/GB9103792D0/en
Priority claimed from GB919112447A external-priority patent/GB9112447D0/en
Priority claimed from GB919115431A external-priority patent/GB9115431D0/en
Priority claimed from GB919119645A external-priority patent/GB9119645D0/en
Application filed by AgriTay (Holdings) Ltd, AGRITAY HOLDINGS Ltd filed Critical AgriTay (Holdings) Ltd
Publication of EP0571458A1 publication Critical patent/EP0571458A1/de
Application granted granted Critical
Publication of EP0571458B1 publication Critical patent/EP0571458B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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]
    • B65D88/1618—Flexible intermediate bulk containers [FIBC] double-walled or with linings
    • 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 large capacity flexible containers which are suitable for storage and transport of various goods, particularly dry goods of powdered or granular type.
  • Such containers are often referred to as flexible intermediate bulk containers and they typically have a capacity in the range from 0.25 - 2.0m3 and are rated as safe for loads of half a tonne up to three tonnes. They are made of flexible material which must be of adequate strength for lifting of the filled containers by engaging one or more handles or loops at the top.
  • the usual material is woven synthetic plastics, for example woven tapes of polypropylene.
  • EP-A-0118112 discloses a container of this type produced from a body of tubular woven material or from a body of flat woven material which is seamed at the sides. Slits are provided by cuts down from the top edge of the material or by unseamed edge regions above a load carrying section of the container. Top edge regions at respective sides of the cuts or slits are joined and the material above the load carrying section is gathered together, often within a sleeve, to provide an integral lifting loop or handle which includes substantially all the longitudinal fibres or tapes of the woven material. Manufacture of this style of container is simple and inexpensive and consequently it is widely used.
  • the integrally formed lifting loop offers a restricted aperture therebelow as target area for engagement of lifting means, e.g. fork lift tines, because substantially all the longitudinal fibres or tapes of the body material extend into the lifting loop.
  • lifting means e.g. fork lift tines
  • fork lift operators have difficulty in accurately aiming for such restricted apertures. This is troublesome in itself and also frequently results in damage to the material of the loop. This can have serious safety implications since if damage to the loop significantly impairs the strength thereof subsequent lifting could be hazardous.
  • the lifting loops of lower containers are generally so collapsed that it is necessary for operatives manually to raise them to expose the aperture for lifting purposes. If this is not done, probing with the lifting means is likely to result in damage to the lifting loop and/or to an inner liner, if present.
  • Field studies and experiments in a wind tunnel have revealed that a lifting loop which includes substantially all the longitudinal fibres or tapes of the base material flaps so violently in high winds as to lead to disintegration, e.g. by fraying of edges. Even modest exposure to wind speeds which are commonly encountered in practical situations can impair lifting loop strength to such a degree as to make lifting unsafe.
  • material of a liner to such a container, in which the contents are enclosed is liable to damage by friction either as a result of the violent motion of the lifting loop, particularly if it is frayed or otherwise damaged, or as a result of its own motion where it is exposed and capable of billowing. If the liner is punctured or split it no longer provides an effective barrier to moisture and the contents are likely to be ruined. Thus, considerable economic losses can result from the susceptibility of these containers to wind damage.
  • GB 2042469 discloses a container in which upward extensions of only part of the walling are used to provide a lifting loop or handle. An upstanding spout is formed between these extensions by making V-shaped cut outs and seaming the edges thereof. This is not a viable method of producing a container. Such V-shaped seaming tends to suffer from high levels of stress at the base of the V causing localised fabric failure at relatively low loads. Furthermore, the spout has been shown in wind tunnel tests to flap violently, resulting in damage to the spout material and any liner within the container in the manner previously discussed.
  • GB 1581438 discloses a cuboid container in which only half the walling material can extend into the lifting area.
  • This container is produced from at least two lengths of woven material by stitched seams at each join between side and end walls and also along bottom wall edges.
  • This style of container is not economical to manufacture and is not widely used. It has two main limitations, namely inefficient use of fabric strength and the fact that the container inevitably takes up an oval cross section in use as a consequence of two of the four sides being unrestrained, particularly during lifting. Distortion to oval cross section leads to storage problems and stacking can be unsafe.
  • An object of the present invention is to provide a method of manufacturing a flexible container with at least one integral lifting loop or handle as simply and as economically as possible, the resultant container requiring a minimum of intervention by operatives upon filling and lifting, and being more resistant than any hitherto known container designs to handle and/or liner damage upon lifting or upon exposure to high winds.
  • the present invention proposes a method of manufacturing a flexible container of the type having side walling of tubular form and at least one lifting loop which is an integral extension of the side walling, comprising the steps of cutting the side walling from the top edge thereof to provide at least two portions and at least two flaps in the upper regions of the side walling, and joining together the top edges of said portions to form the lifting loop or loops, characterised by slits in the side walling defining said portions and flaps, and by the steps of extending the flaps, which do not contribute to the loop or loops, across the top of the container below the lifting loop or loops, and securing them in position to provide a substantially laid flat closure to the top of the container.
  • the side walling or body material of the container of the invention will generally consist of woven material having longitudinal and transversely extending interwoven strands.
  • the term "strands" as used here should be understood to include tapes or fibres or any other filamentary elements.
  • the lifting loop or loops should ideally include between 50% and 75% of the said longitudinal strands of the woven material. The optimum has been found to be between 60 and 65% allocated to the lifting loop or loops.
  • the protective flaps will then include all, or a substantial proportion of, the remainder of the longitudinal strands, i.e. a small portion may be cut away altogether.
  • the portions of material forming the lifting loop or loops and the portions of material left as flaps need not be the same length in the finished container. Either could be cut shorter than the other, although it would be more usual for the flaps to be cut shorter than the portions forming the loop or loops.
  • the body material for production of containers in accordance with the invention consists of tubular walling. This may be formed by flat pieces joined by seams. Preferably, however, the body material is woven in one piece as a tube so as to avoid additional steps of seaming in the production process, which must be kept as cost effective as possible.
  • the initial unfilled container may be supplied with loose flaps which will be secured across the top of the container only after the container has been filled.
  • the flaps may then be secured by adhesive or by stitching or by use of tie tapes, which may be provided on one or both of the flaps, or by any combination of these.
  • the flaps can be tensioned to maximise aperture size for lifting purposes and protection of any liner against wind damage.
  • a tight top closure also secures the contents of the container so that a more compact and stable package results.
  • the initial unfilled container may be supplied with flaps already secured across the top of the load receiving section of the container.
  • the flaps may be attached to each other directly, e.g. by stitching. Additionally or alternatively side edges, or at least portions of side edges, of the flaps may be connected to the base of the respective sides of the lifting loop or loops, e.g. by stitching. Another possibility is that the flaps are connected to each other indirectly by way of one or more intervening panels of stretchable material, such as elasticated or knitted material.
  • a container with flaps already secured has the advantage that additional manipulation by operatives to secure the flaps after filling can be avoided.
  • flaps With either style of container, i.e. with flaps closable after filling or closed prior to filling, it is advantageous for the flaps to overlap to provide double layer or multilayer protection.
  • one flap may simply overlie the other, or one or both flaps may be folded over.
  • a double layer extends over the full width of the container.
  • a double thickness across at least 20%, and preferably over 50% of the width of the container top still has benefits.
  • the flaps may be attached directed to each other.
  • distal side edge regions of the flaps may be secured to each other to provide a filling spout for the container. After filling, such a spout will be folded down flat and secured across the top of the container as part of the top closure.
  • a body panel of tubular woven polypropylene tapes is firstly cut to a selected pattern. Cuts 29 are made down from a top edge of the material to provide bpposing loop or handle forming portions, designated by reference numeral 30 in all the figures, and, between these, opposing flaps, designated by reference numeral 40 in all the figures. Top edges of the respective portions 30 are joined together, typically by stitching for greatest security, so as to provide a loop or handle, designated 31 in all the figures.
  • the material of the handle 31 is preferably gathered together and bound by a sleeve 32, as shown, to provide a well defined handle with a clear aperture therebelow for lifting the eventual filled container.
  • the base of the body panel is closed off in accordance with any conventional pattern. For example, it may be cut appropriately to provide for cross shaped seaming or for overlapping flaps seamed across the bottom, or a separate bottom panel may be inserted.
  • the closure of the base is not relevant to the present invention and is not illustrated.
  • a liner designated generally by reference numeral 50, and typically of flexible, substantially impermeable plastics sheet material is inserted into the container, for subsequent filling.
  • Such containers are commonly used for powdered or granular fertilizers, or other chemicals, and it is important that these are kept dry within the liner.
  • the manner of securing the flaps 40 across the top of the container, below the handle 31, varies. Also, in use of said containers, the time at which securement of the flaps takes place varies, i.e. prior to or after filling the containers.
  • the drawings show some of the main variants.
  • the flaps 40 are cut shorter than the flanking handle forming portions 30, but each flap 40 is long enough to extend more than half way across the width of the top of the filled container (Figs. 2 and 3).
  • One of the flaps is provided with a pair of tie tapes 41 extending from its free upper edge and two rows of slits 42 are cut in corresponding positions in the lower region and/or below the extent of the opposing flap 40.
  • the container shown in Fig. 1 will have the top edges of the portions 30 secured to each other by stitching to provide a lifting loop 31 above the flaps 40, as shown in Fig. 2 and as already mentioned.
  • the liner 50 will be inserted therein, with its mouth possibly temporarily engaged by one of the cuts 29.
  • the flaps 40 are pulled tight across the top thereof and secured.
  • the flap with the tie tapes 41 is uppermost and partially overlaps the other flap.
  • the tapes 41 are secured by threading through any of the corresponding row of slits 42 and being tied.
  • the top of the liner 50 is protected by the overlying, overlapping flaps 40. Moreover, when the latter are pulled as tightly as possibly across the top of the filled container, the liner is especially well protected against wind damage as it is not free to billow. A more clearly accessible aperture for lifting purposes also results when the flaps are pulled tightly across the container top as well as a more stable and compact package for storage, particularly outdoor storage in windy conditions.
  • the second illustrated embodiment differs from the first only in that the flaps 40 are secured, after filling, by adhesive at 43 instead of by tie tapes.
  • the flaps 40 are joined to each other prior to filling of the container.
  • the upper edges of the opposing flaps 40 are stitched to each other at 44.
  • An additional central slit or V-shaped cut-out 45 in each flap 40 provides an opening through which the neck of the liner 50 can be pulled for filling purposes.
  • the depth of the cuts 29 and/or the length 1 of the flaps 40 should be chosen to allow minimum ullage within the top of the filled container, above the expected fill height 60, commensurate with a reasonably well secured top closure to the filled container.
  • the top closure extending across below the lifting loop will not be as taut as when the flaps are pulled over and secured after filling and settling of contents.
  • the neck of the liner can be closed off, if required, and can be tucked back through the opening provided by the slits 45.
  • the fourth embodiment shown in Figs. 9 and 10 differs from the third embodiment only in that there is no special provision for an opening through which the neck of the liner 50 can protrude for filling purposes. In this case, the liner neck simply protrudes from one side of the joined flaps 40.
  • the fifth embodiment is similar to the third, but additionally incorporates tie tapes 41 so that the flaps 40, which are stitched together at 44 prior to filling, can be pulled tight across the top of the container after filling.
  • the tapes 41 can be secured by being threaded through any of a series of appropriately positioned slits 42 and tied back on themselves.
  • the slits 42 in this case may be on or below the flap 40 which carries the tie tapes 41.
  • the pulling tight will involve the folding over at 46 of the connected flaps 40 to provide multilayer protection for the top of the liner 50, the neck of which is tucked back below the flaps 40, as previously.
  • the depth of the cuts 29 or length of flaps 40 is not critical, as slackness is taken up in the post-filling tightening operation.
  • the opposing flaps 40 are each provided with a central slit 45, in the manner of the third embodiment.
  • their upper edges, at respective sides of those slits 45 are connected by way of respective panels 47 of stretchable or elastic material.
  • These panels 47 may be of any suitable elasticated or knitted material, or resilient sheet material, and they are conveniently sewn in between the upper edges of the flap portions, as shown in Fig. 14, L, L' connecting to A, A' and M, M' to B, B' at one side, and N, N' connecting to C, C' and O, O' to D, D' at the other side.
  • An opening for the neck of the lining 50 to protrude through for filling purposes is provided by the slits 45 and between the panels 47 and after filling the neck is tucked back below the flaps and panels as shown in Fig. 15.
  • the panels 47 Upon filling of the container, the panels 47 will stretch and their inherent resilience will maintain the tightness of the top closure, and the advantages accruing thereto as regards stability of the filled container in windy conditions.
  • the flaps 40 are of equal length to the loop forming portions 30, thus making use of all the material of the initial tubular woven body panel.
  • the flaps 40 are overlapped for substantially the entire width of the container top and upper flap is secured by stitching, at 48, prior to filling.
  • Slits 49 are cut centrally in each of the flaps 40 and so are in approximate alignment, to provide an opening for the liner neck, when the flaps 40 overlap each other.
  • the initial body panel is identical to that of the preceding embodiment (Fig. 16), but each flap 40 is folded back on itself prior to seaming. Thus, a central seam is produced at 58 (Fig. 20) in place of the seam 48 in Fig. 17.
  • a slit or slot elongate in a direction longitudinally of the body panel material, thus through the lifting aperture of the finished container, is preferable as it minimises weakening of the container material, whilst allowing a reasonable size for manipulation of the liner neck therethrough and for filling therethrough.
  • a slit or slot orientated transversely or a gap left in a seam of stitching, or in a line of adhesive whereby the flaps are secured together are possible alternatives, but are less desirable as they entail an increased risk of lifting means catching in the opening.
  • the liner neck may project to one side of one or both flaps, (as in some of the illustrated embodiments); or the liner may be filled from the base of the container so that it does not need to have a neck protruding at the top.
  • each flap is preferably at least 60% and up to 100% of the width of the top of the filled container to allow an advantageous overlap or double thickness of from 20% up to 100%.
  • the initial body panel is shown in all the illustrated embodiment with the handle forming portion 30 flanking the opposing flaps 40 for top closure, it is quite feasible to produce the container from an initial cut panel where the handle forming portions are central and the flaps are at respective sides thereof. This is simply a transposition of parts through 90° and is a matter of choice in the manufacturing procedure.
  • the cuts down from the top of the body panel need not be straight. They may have curvature inwards towards the vertical centre line of the body panel. When joined, and laid flat across the top of a filled container, this curvature would extend the top protection towards the base of the lifting loops. A greater part of the liner would be covered, than would be the case with linear cuts.
  • Another alternative is to have a serrated or zig-zag edge to the cuts as this will promote fray resistance to the woven material adjacent to the cuts.
  • a container of especially high strength may be produced by using two layers of body material instead of one in any of the foregoing embodiments.
  • an initial tube of material may be cuffed back upon itself or, more simply, one body panel may be inserted inside another at the outset.
  • the two layers can then be cut and seamed simultaneously to produce the final container with lifting loop or loops, and with double thickness top closure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)

Claims (9)

  1. Verfahren zur Herstellung eines flexiblen Behältnisses des Typs mit rohrförmiger Seitenwandung und zumindest einer Hochziehschlaufe (31), die eine einstückige Verlängerung der Seitenwandung darstellt, umfassend die Schritte des Einschneidens der Seitenwandung von ihrer Oberkante, um zumindest zwei Abschnitte (30) und zumindest zwei Klappen (40) in den oberen Bereichen der Seitenwandung bereitzustellen, und das Aneinanderfügen der Oberkanten der Abschnitte (30), um die Hochziehschlaufe oder -schlaufen (31) zu bilden, gekennzeichnet durch Schlitze (29) in der Seitenwandung, die die Abschnitte (30) und Klappen (40) definieren, und durch die Schritte des Erstreckens der Klappen (40), die nicht zu der oder den Schlaufe(n) (31) beitragen, über die Oberseite des Behältnisses unter der/den Hochziehschlaufe oder -schlaufen (31), und ihr Befestigen in Position, um einen im wesentlichen flachgelegten Verschluß für die Oberseite des Behältnisses bereitzustellen.
  2. Verfahren nach Anspruch 1, worin die Seitenwandung des Behältnisses aus Webmaterial mit sich in Längsrichtung und Querrichtung erstreckenden verflochtenen Strängen besteht und die Abschnitte (30), die an ihren Oberkanten aneinandergefügt sind, um die Hochziehschlaufe oder -schlaufen (31) bereitzustellen, zwischen 50% und 75% der Stränge in Längsrichtung umfassen, wobei sich zwischen 25% und 50% der Stränge in Längsrichtung in die Klappen (40) erstrecken, die den Verschluß für die Oberseite des Behältnisses darstellen.
  3. Verfahren nach Anspruch 2, worin die Seitenwandung aus Material besteht, das rohrförmig gewoben ist.
  4. Verfahren nach einem der Ansprüche 1 bis 3, worin die Klappen (40) durch Nähen (44, 48, 58) oder durch Kleben (43) aneinander befestigt werden.
  5. Verfahren nach einem der Ansprüche 1 bis 5, worin eine Öffnung zwischen den jeweiligen Klappen (40) bestehen bleibt, um den Zugang zwecks Füllen und/oder das Herausragen eines Kragens einer Auskleidung (50) des Behältnisses zu ermöglichen.
  6. Verfahren nach einem der Ansprüche 1 bis 4, worin eine Öffnung (45, 49) in zumindest einer der Klappen vorgesehen ist, um den Zugang zwecks Füllen und/oder das Herausragen eines Kragens einer Auskleidung (50) des Behältnisses zu ermöglichen.
  7. Verfahren nach Anspruch 6, worin die Öffnung die Form eines Schlitzes (45, 49) hat.
  8. Verfahren nach einem der Ansprüche 1 bis 7, worin Seitenkanten oder zumindest Abschnitte von Seitenkanten der Klappen (40) an der Basis der Hochziehschlaufe oder -schlaufen (31) befestigt sind.
  9. Verfahren nach einem der vorangegangenen Ansprüche 1 bis 8, worin das Behältnis vor dem Befestigen der Klappen (40) über die Oberseite des Behältnisses hinweg mit Material gefüllt wird.
EP92904596A 1991-02-22 1992-02-19 Flexibler Behälter Expired - Lifetime EP0571458B1 (de)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
GB919103792A GB9103792D0 (en) 1991-02-22 1991-02-22 Flexible containers
GB9103792 1991-02-22
GB919112447A GB9112447D0 (en) 1991-06-10 1991-06-10 Flexible containers
GB9112447 1991-06-10
GB9115431 1991-07-17
GB919115431A GB9115431D0 (en) 1991-07-17 1991-07-17 Flexible containers
GB919119645A GB9119645D0 (en) 1991-09-13 1991-09-13 Flexible containers
GB9119645 1991-09-13
PCT/GB1992/000287 WO1992014659A1 (en) 1991-02-22 1992-02-19 Flexible containers

Publications (2)

Publication Number Publication Date
EP0571458A1 EP0571458A1 (de) 1993-12-01
EP0571458B1 true EP0571458B1 (de) 1996-05-01

Family

ID=27450628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92904596A Expired - Lifetime EP0571458B1 (de) 1991-02-22 1992-02-19 Flexibler Behälter

Country Status (2)

Country Link
EP (1) EP0571458B1 (de)
WO (1) WO1992014659A1 (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1581438A (en) * 1977-09-05 1980-12-17 Lolift Uk Ltd Containers
GB2094757B (en) * 1982-03-01 1984-09-19 Nattrass Frank Flexible bulk containers
GB2136771A (en) * 1983-03-24 1984-09-26 Lolift Containers for bulk material
DK148625C (da) * 1983-06-03 1986-02-24 Nyborg Plast Saek, fortrinsvis en engangssaek, isaer til rislegods
GB2168949B (en) * 1984-12-29 1989-04-19 Lolift B G Limited Intermediate bulk containers
EP0382951B1 (de) * 1989-02-06 1993-12-29 Condepols, S.A. Verfahren für die Herstellung eines flexiblen Behälters zum Fördern und Lagern von Schüttgut

Also Published As

Publication number Publication date
EP0571458A1 (de) 1993-12-01
WO1992014659A1 (en) 1992-09-03

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