WO1993012995A1 - Amelioration concernant les conteneurs pour produits en vrac - Google Patents

Amelioration concernant les conteneurs pour produits en vrac Download PDF

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Publication number
WO1993012995A1
WO1993012995A1 PCT/GB1992/001447 GB9201447W WO9312995A1 WO 1993012995 A1 WO1993012995 A1 WO 1993012995A1 GB 9201447 W GB9201447 W GB 9201447W WO 9312995 A1 WO9312995 A1 WO 9312995A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
fabric
zones
base
reinforced
Prior art date
Application number
PCT/GB1992/001447
Other languages
English (en)
Inventor
James Francis John Hughes
Original Assignee
Bowater Packaging Limited
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
Application filed by Bowater Packaging Limited filed Critical Bowater Packaging Limited
Publication of WO1993012995A1 publication Critical patent/WO1993012995A1/fr

Links

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]
    • B65D88/1631—Flexible intermediate bulk containers [FIBC] with shape keeping flexible elements
    • 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 flexible bulk containers such as are used in the storage and transport of materials in granular, powder and other particulate forms.
  • Such containers are generally in the form of large bags or sacks which are often required to carry loads of half tonne, one tonne or more, with considerable safety margin above their rated working load.
  • the containers are commonly made from woven fabric, particularly woven polypropylene or other synthetic material.
  • such a container comprises a base, a main body structure of front, rear and side walls extending upwardly from the base and one or more lifting loops formed from upward extensions of the side walls.
  • the present invention seeks to improve the strength of such a container, particularly in these main load bearing areas, and additionally or alternatively seeks to maximise the use of the material in non load bearing areas to give an enclosed top cover.
  • a method of manufacturing a flexible bulk container of the type comprising a base, a main body structure of front, rear and side walls extending upwardly from the base, the method including the steps of providing a tubular fabric, providing in said tubular fabric at least two opposed reinforced zones, and assembling the container such that said reinforced zones form at least two opposed side walls of the container.
  • the tubular fabric is circular woven, it may alternatively be provided by taking a flat material and forming it into a tube by making a back seam, this option being particularly useful if a two side coated material is used to fabricate the container by say heat sealing or other gluing or welding techniques.
  • the lower edge of the main body structure may be joined to a separate base of strength characteristics similar to those of the reinforced zones (this embodiment will hereinafter be referred to as the "sewn-in base”) , or alternatively the lower regions of the reinforced zones may form a part of the base (this embodiment will be referred to hereinafter as the "cross- sewn base”) .
  • the upper regions of the reinforced zones may be joined together (and sleeved if required) to form a lifting loop, or alternatively/additionally they may form upper channels or loops.
  • the container is manufactured from circular woven fabric which has two opposed reinforced zones of strong warp and lighter warp between said zones.
  • the stronger warp is twice as strong as the lighter warp.
  • the lighter warp is of normal strength or even lighter.
  • the extra strength in the strong warp regions may be formed in several ways, e.g. higher tex or denier tapes, double or "piggy back" tapes, crammed tapes or reinforcing filaments replacing or in addition to the tapes.
  • the "sewn-in base” embodiment is manufacture by joining (which term is to be interpreted as covering, stitching, gluing, heat- sealing or other similar treatments) the edges of a separate base to the lower edges of the main body structure, the separate base comprising a fabric tube or flat piece of fabric.
  • marker tapes are attached or woven in to the lower edge of the main body structure at the boundaries between the reinforced and unreinforced zones, thereby defining the corners of the finished container.
  • the "cross-sewn base” embodiment is manufactured by making a second series of slits extending upwardly from the bottom edge of the fabric.
  • the lighter warp panels at the bottom of the fabric are folded in to provide an inner ply at the base.
  • the bottom edges of the two reinforced zones are then brought together and joined (which term is to be interpreted as covering, stitching, gluing, heat-sealing or other similar treatments) to form a seam in the base of the container.
  • the bottom edge of the tubular fabric may, if desired, be heat sealed in the region of the lighter warp, such that the inner ply of the base forms a unitary piece. This is particularly relevant if coated material is used and a maximum level of water resistance is desired.
  • sacrificial panels for use in testing for degradation due to exposure to ultraviolet radiation may be included either sewn to or forming an integral part of the lighter warp region.
  • a method of manufacturing a flexible bulk container of the type comprising a base and a main body structure of front, rear and side walls extending upwardly from the base, the method including the steps of providing a tubular fabric, making in said fabric at least four slits extending down from the top edge of the fabric thereby defining between said slits four flaps each being an upward extension of a side, front, side and rear wall respectively, and joining each of said front and rear wall extension flaps together and to at least on respective adjacent side wall extension flap.
  • the preferred embodiments of the invention are those which incorporate the features of both aspects of the invention, namely a container having reinforced side walls and lighter warp front and rear walls, as well as having a substantially water resistant top provided by folding the lighter warp panel uppper extension flaps over each other and joining them together as well as to respective side walls of the container.
  • a filling aperture may be formed by bringing together the free top edges of the lighter warp regions to form a filling spout, or alternatively these edges may be folded over each other or joined together to form a single or double cover. In the case of a single or double cover, a filling slit is cut in the cover. If a discharge spout or similar mechanism is employed in the base, the top may be completely sealed and the container may be filled through the base in its inverted position. This application is particularly relevant when coated fabric is used to make the bag and a largely rainproof water resistant top is required.
  • the container manufactured in accordance with either or both aspects of the present invention may be provided with an impervious liner which is simply closed at its upper end. after filling and then folded into the interior of the container.
  • these liners are bottle-shaped, i.e. the upper region of the liner is much narrower than the lower region, manufactured by taking a flat square or rectangular liner, heat sealing at each side of the neck and shoulder regions and cutting away the excess liner.
  • the cut-away portions are discarded, but according to the present invention the excess liner section on either side of the neck/shoulder regions are only partially cut away from the ' main liner and may be sewn into the filling spout to retain the liner in position, or, in the case of single/double cover, opened out and attached with the top flaps during the fabrication of the top part of the container to provide secure liner positioning and retention, and at least a partially waterproof cover for the container.
  • Figure 1 illustrates the circular woven fabric used to manufacture the "sewn-in base" embodiment of the container in accordance with the invention
  • Figure lA(i) illustrates a separate base in the form of a single piece of fabric
  • Figure lA(ii) illustrates a separate base in the form of a fabric tube
  • Figure IB illustrates the completed "sewn-in base" container
  • Figure 1C is a view of the "sewn-in base" of the container of Figure IB;
  • Figure 2 illustrates the circular woven fabric used to manufacture the "cross-sewn base" embodiment
  • Figure 2A illustrates the completed "cross-sewn base” container
  • Figure 3 illustrates the "cross-sewn base” of the container of Figure 2A
  • Figure 4 illustrates the various different steps involved in folding and sewing the "cross-sewn base"
  • FIG. 5 illustrates the various different steps involved in folding and sewing the "double cover" top
  • FIG. 9(c) illustrate the various different designs of top cover and filling apertures
  • Figure 9(d) illustrates utilisation of excess regions of a bottle-shaped liner for sewing into the spout of a spouted container
  • Figures 9(e) and 9(f) illustrate utilisation of excess regions of a bottle-shaped liner for forming the liner retention/waterproof cover during fabrication of the single/double cover container;
  • Figure 10 illustrates, in Figure 10(i), the single handled double cover version of the container and, in Figure 10(ii), the single handled spouted version;
  • Figure 11 illustrates, in Figure 11(i) , the two handled spouted version, and, in Figures 11(ii) and ll(iv) , the steps involved in forming the handles and the spout and, in Figures ll(iii) and 11(v) the steps involved in forming the base discharge spout;
  • Figure 12 illustrates the principal design of a multi-lift bag in accordance with the present invention
  • Figure 13 through 17 illustrate variants of the multi-lift bag shown in Figure 12;
  • Figures 18 and 18(a) illustrate two different base options which may be used on any of the containers shown in Figures 12 to 17;
  • Figures 19 through 21 illustrate the manufacture of a square bag in accordance with the present invention.
  • FIGs 22 through 24 illustrate variants of the square bag as shown in Figures 19 through 21.
  • the "sewn-in base" embodiment of the container according to the invention is manufactured from a single piece of tubular fabric 62.
  • the fabric 62 has a width W and is woven such that there are two reinforced zones 63,64 of a stronger and/or stiffer warp, which occupy approximately half the total area of the tubular fabric, these being separated by two central regions of lighter warp 65,66.
  • marker tapes are woven in at points A, B, C and D to define the eventual corners of the container.
  • a separate base comprising a flat piece of fabric as shown in Figure lA()i) or a piece of tubular fabric as shown in Figure lA(ii) is sewn to the lower edge of the fabric 62 between the marker tapes, as shown in Figures IB and lC.
  • the strength of the base material is comparable, in each direction, to the panels of fabric 62 to which it is sewn, so that in the case of a flat piece of material, this would have to be of the same or similar strength as the reinforced panels of fabric 62, at least in those regions which are joined to the reinforced panels 63,64, whereas the tubular base need only be of normal strength as the double ply structure gives added strength to the base.
  • the base is sewn in with turned-over hems along tube ends AD and BC.
  • the "cross-sewn base" embodiment of a container according to the invention is manufactured from a single piece of tubular fabric 62 similar to that shown in Figure 1.
  • Two series of four slits are formed in the fabric, a first series of slits 67, 68, 69 and 70 extending from the top edge of the fabric to points J,K,M and L at the boundaries between the strong warp and the lighter warp regions, and the second series of slits 71, 72, 73, 74 extending upwardly from the bottom edge of the fabric to points N, P, R and Q at those same boundaries.
  • the bottom edges of the two lighter warp regions 65, 66 are folded in as shown in Figures 3 and 4(ii) and sewn with hem type A (see Figure 4(iv)) to form an inner ply which provides base padding. Then, the bottom edge of stronger warp region 63 is then sewn using hem type B (see Figure 4(b)) between points A, D, to the bottom edge of the other stronger warp region 64 between points B & C, to form the main outer base support seam AB-DC shown in Figures 3 and 4(iii) .
  • the bottom edges of the lighter warp- region 65, 66 may be heat sealed together as shown in Figure l at the cutting stage, to form a more puncture proof double base and the base side apertures may be sewn up to form a sealed double base with no internal sharp fabric edges.
  • the central lighter warp regions at the top of the fabric are brought together to form a top cover which can take the form of various different arrangements shown in Figures 6 through 9(c) .
  • the top edge of stronger warp region 63 is sewn between points E & H to the top edge of the stronger warp region 64 between points F and G to form the lifting loop 75 in the finished container, this lifting loop being sleeved if required.
  • Figures 5(i) through 5(v) illustrate in more detail the construction of one particular type of top cover, the fully- sewn double cover.
  • the lighter warp panels 65, 66 are folded down and sewn using hems M-J, L-K, J-K and M-L as shown in Figures 5(ii) and 5(iii).
  • the reinforced, stronger warp panels 63, 64 are brought together as shown in Figure 5 (iv) and the tops of these panels are sewn together and lashed" to form the handle 75 shown in Figure 5(v).
  • the stronger warp regions 63, 64 form a "lifting cradle" comprised of the outer base ply, the side walls and the lifting loop, whereas the lighter warp regions form a secondary hoop which offers top protection and further base padding as a second ply at the base.
  • each slit edge of lighter warp regions 65 and 66 is sewn or heat-sealed to a respective side wall of the container, and a spout is formed by sewing together remaining unsewn portions adjacent to the upper edge of each region 65, to point Fl in figure 6, points E,H, correspond to point El.
  • a tying rope 80 for tying off the spout may be incorporated as shown in Figure 6.
  • top cover arrangement shown in Figure 6 is referred to as a "fully sewn spout", but the arrangement shown in Figure 7, which is constructed in a similar manner as shown in Figure 6, is a "partially sewn spout", that is to say only the edges of the spout are sewn or heat sealed, with the sides K-L and J-M left open.
  • FIG 8 a partially sewn single cover is shown, in which the edges E-F and H-G of lighter warp regions 65, 66 are brought together and heat sealed or sewn between points El, Fl to close the cover, with the liner sealed through the fabric and both stitched above the seal line.
  • a filling slit 82 is incorporated in the cover of Figure 8. '
  • Figure 8(a) illustrates a simple double cover in which the two upper regions 65, 66 are simply overlapped and aligned fulling slits 83 are provided in each layer. This may be fixed before or after filling by stitching, gluing, "velcro", tying tape or similar.
  • Figures 9 through 9(c) illustrate a fully sewn double cover, and in this arrangement the two filling slits 84,85 may, if desired, be out of register, to give a self closing action after filling.
  • the upper regions 65,66 are overlapped as in Figure 8(a) , the inner layer is sewn to the side wall structure along edges M-L and L-K, and the upper (outer) layer is sewn to the side wall structure along edges M-J and J-K.
  • This opposed method of sewing the top cover to the side wall structure permits flexing when the container is under strain.
  • Figures 9(b) and 9(c) illustrate further alternative top cover options. Both inner and outer layers are sewn simultaneously to the side wall structure along any two sides (e.g. along sides J-M and K-L shown in Figure 9(b) or on all four sides as shown in Figure 9(c) .
  • the liner is cut along lines x-x on each side of the neck, and the upper edges of the shaded regions are sewn into the spout to retain the liner in position within the container.
  • the liner is cut along lines x-x and y-y on each side of the liner, and the shaded regions are pulled through the filling slit of the double cover and opened out to provide a waterproof cover as shown in Figure 9(f).
  • FIG 10 this illustrates, for the purposes of comparison, a double cover container 160 in Figure 10(i) and a spouted container 162 in Figure 10(ii) both of these having a single lifting loop or handle 160a, 162a.
  • the lighter warp regions may be provided with a print area 160b, 162b.
  • the handles are formed from the reinforced panels which also form the main base panel 164d, the latter can be sewn with a slit 164f to house and allow a discharge spout 164e, formed from the lighter warp panels, to protrude.
  • the discharge spout can be tied off using an optional tie cord 164g and/or tucked in the base cover.
  • FIG 12 a variation on the container shown in Figure IB or Figure 2 is designated generally by 90 and is made from the same type of reinforced tubular fabric 91 as that shown in Figures 1 and 2, but includes built-in auxiliary channels or loops 92, 93 of reinforced material and a filling spout 94 or slotted top.
  • This type of container known as a "multi-lift" bag allows low level (height restricted) container loading, and can be filled on most 4-loop or 1-loop filling rigs.
  • the design which should be compatible with UN Hazardous Goods requirements, offers maximum cloth utilisation. Assembly is simple, with an average of nine lines of sewing per bag, all on the same machine.
  • the lifting loop 95 can be pushed out of the way.
  • the design is suitable for many different applications, including long haul use where contamerisation would be followed by various handling operations e.g. cranes, hooks, tractors etc.
  • the channels 96, 97 are located at the base of th container, whereas in Figure 14 the channels 92, 93 are locate as shown in Figure 12 but the container includes a doubl thickness cover with filling slits 98, 99.
  • Figure 15 illustrates a variant in which there is no lifting loops and instead there is provided four corner loops 100, 101, 102, 103, as well as auxiliary channels 104.
  • Figure 16 shows a container having internal channels 105, 106, i.e. arranged internally of the lifting loop
  • Figure 17 illustrates a version having no lifting loop, only channels 107, 108.
  • Figure 18 shows a cross-sewn option for a plain base, similar to that, shown in Figure 3 and Figure 18(a) illustrates sewn-in base option for a plain or discharge spout base, the latter having a hole 109 for location of a discharge spout.
  • FIGs 19 through 21 illustrate a different type of container in which two pieces of tubular fabric 110, 111 are stitched together along line A-B to form a four-compartment container 112.
  • Each piece of tubular fabric has a series of holes 113 which are aligned in the assembled container to form communicating passageways between the compartments.
  • the reinforced zones 110A, HOB and 111A, 111B of each fabric piece 110, 111 together from the side walls of the container. For this embodiment, square sewn in tops are required.
  • upper regions of reinforced zones 110A, HOB, 111A and 111B are each slit and sewn and bound together to form four corner lifting loops 114, 115, 116, 117.
  • top 125 In the case of the container variants shown in Figures 22 and 23, a separate, square sewn in top 125 is required, but in the case of the variant shown in Figure 24, the remaining portions of the upper regions of the reinforced zones can be folded over and sewn to form a top 126.

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

Abstract

On décrit un procédé de fabrication d'un conteneur flexible (60) pour produits en vrac à partir d'une ou de plusieurs pièces de tissu de forme tubulaire (62). Un aspect de l'invention concerne la présence de zones de renforcement opposées (63, 64) dans le tissu tubulaire qui dans le conteneur fini forment des parois latérales opposées. L'autre aspect de l'invention concerne la présence d'un dessus sur le conteneur qui est sensiblement imperméable et qui est formé en utilisant les régions supérieures des parois avant et arrière (65, 66) du conteneur.
PCT/GB1992/001447 1991-12-31 1992-08-04 Amelioration concernant les conteneurs pour produits en vrac WO1993012995A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB919127567A GB9127567D0 (en) 1991-12-31 1991-12-31 Improvements relating to bulk containers
GB9127567.7 1991-12-31

Publications (1)

Publication Number Publication Date
WO1993012995A1 true WO1993012995A1 (fr) 1993-07-08

Family

ID=10706940

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1992/001447 WO1993012995A1 (fr) 1991-12-31 1992-08-04 Amelioration concernant les conteneurs pour produits en vrac

Country Status (4)

Country Link
CN (1) CN1073917A (fr)
AU (1) AU2389292A (fr)
GB (2) GB9127567D0 (fr)
WO (1) WO1993012995A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2279935A (en) * 1993-06-30 1995-01-18 Morishita Chem Ind Flexible container
EP0664259A1 (fr) * 1994-01-20 1995-07-26 Rexam Mulox Limited Conteneur à sac

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2277730A (en) * 1993-05-07 1994-11-09 Lionel Nicholas Mantzivis A sack comprising sheets formed from flattened tubes of circularly woven fabric
DE69524449D1 (de) * 1995-09-21 2002-01-17 Water Weights Ltd Vorrichtung zur belastungsprüfung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2356569A1 (fr) * 1976-06-28 1978-01-27 Norsk Hydro As Sac d'emballage et son procede de realisation
GB1581438A (en) * 1977-09-05 1980-12-17 Lolift Uk Ltd Containers
EP0030652A1 (fr) * 1979-12-12 1981-06-24 Norsk Hydro A/S Conteneur flexible
DE3736859A1 (de) * 1987-10-30 1989-05-18 Kielbassa Herbert Dr Ing Gewebter grosssack fuer schuettgueter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1604212A (en) * 1978-05-31 1981-12-02 Tay Textiles Ltd Flexible containers
US4822179A (en) * 1984-07-16 1989-04-18 Bulk Lift International Incorporated Semi-bulk transport bags with lifting members of bag material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2356569A1 (fr) * 1976-06-28 1978-01-27 Norsk Hydro As Sac d'emballage et son procede de realisation
GB1581438A (en) * 1977-09-05 1980-12-17 Lolift Uk Ltd Containers
EP0030652A1 (fr) * 1979-12-12 1981-06-24 Norsk Hydro A/S Conteneur flexible
DE3736859A1 (de) * 1987-10-30 1989-05-18 Kielbassa Herbert Dr Ing Gewebter grosssack fuer schuettgueter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2279935A (en) * 1993-06-30 1995-01-18 Morishita Chem Ind Flexible container
EP0664259A1 (fr) * 1994-01-20 1995-07-26 Rexam Mulox Limited Conteneur à sac

Also Published As

Publication number Publication date
AU2389292A (en) 1993-07-28
GB2262907A (en) 1993-07-07
GB9127567D0 (en) 1992-02-19
GB9216049D0 (en) 1992-09-09
CN1073917A (zh) 1993-07-07

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