EP0000838B1 - Récipient flexible pour matière en vrac - Google Patents

Récipient flexible pour matière en vrac Download PDF

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Publication number
EP0000838B1
EP0000838B1 EP78300256A EP78300256A EP0000838B1 EP 0000838 B1 EP0000838 B1 EP 0000838B1 EP 78300256 A EP78300256 A EP 78300256A EP 78300256 A EP78300256 A EP 78300256A EP 0000838 B1 EP0000838 B1 EP 0000838B1
Authority
EP
European Patent Office
Prior art keywords
container
warp
side walls
strength
region
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
Application number
EP78300256A
Other languages
German (de)
English (en)
Other versions
EP0000838A1 (fr
Inventor
Allan Macfarlane Sandeman
James Duncan Bell
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.)
Tay Textiles Ltd
Original Assignee
Tay Textiles 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 GB2579878A external-priority patent/GB1604212A/en
Application filed by Tay Textiles Ltd filed Critical Tay Textiles Ltd
Publication of EP0000838A1 publication Critical patent/EP0000838A1/fr
Application granted granted Critical
Publication of EP0000838B1 publication Critical patent/EP0000838B1/fr
Expired 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]
    • 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.
  • Japanese Utility Model 48-622466 there is disclosed a flexible bulk container of woven fabric having side walls and a closed bottom, the warp threads of the fabric constituting the side walls extending up the container and there being a region of a side wall in which the strength of the warp per unit width is greater than that over at least the major part of the remainder of the side wall.
  • the particular bag disclosed in this Japanese Utility Model is woven using a circular loom and reinforcement is provided by regions of crammed warp threads to which the lifting loops are simply stitched. Whilst this has the advantage of reinforcement inherent in the woven fabric, a circular woven bag is not always desirable and it is frequently desirable to have joins between fabric portions for example to make a bag of square cross-section from a number of panels.
  • a container in accordance with the present invention is characterised by a joint extending along two fabric portions constituting the side walls adjacent selvedges thereof, there being a greater strength warp region adjacent to and terminating at the respective selvedges of the portions where they are joined together, and the lifting means being attached to the side walls in such region.
  • 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. It 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 concentration 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.
  • a container in accordance with the present invention is characterised in that it consists of three woven fabric portions one of which is substantially U-shaped and forms first and second side walls and the base of the container, the warp threads of such portion extending between the first and second side walls and across the base, and the remaining two of which are connected across the ends of the U-shaped portion and form third and fourth side walls, each of said portions including a region of greater warp strength extending the length thereof, the lifting means being attached to said regions.
  • 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 lifting means such as fabric loops, may be stitched or otherwise fastened to the regions of higher warp strength.
  • the higher warp strength regions are adjacent seams
  • 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.
  • 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.
  • Lifting loops for example may be fastened to containers in accordance with the invention by attaching the ends of the strips of loop material to flanges on the container which may for example be radially projecting and formed by pinching together the regions of the container with higher warp strength, the loop ends being attached to the opposite outside faces of the pinched portions.
  • An arrangement combining the use of flanges and reinforced warp regions is desirable in itself and provides advantages over the disclosure in Japanese Utility Model 48-62246.
  • a container in accordance with the present invention is characterised in that there is formed from a region of higher warp strength a flange of at least double thickness material extending from a side wall of the container and the lifting means are attached to such flange.
  • opposite ends of a strip of material to form a loop may be fastened to the inside and the outside surfaces of the container.
  • 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 tape 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 1, to which are attached four lifting loops 2.
  • the bag is of woven fabric, for example, woven polypropylene although polyethylene terephthalate, rayon nylon and so forth could be used.
  • a preferred fabric construction is 5.9 x 4.7 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 terephthalate 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, where the loop 2 is attached there is a higher density of warp threads, i.e. the threads are packed closer together, and/or warp threads of higher strength are used. 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 441.5 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.

Landscapes

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

Claims (15)

1. Récipient souple pour matières en vrac, en tissu tissé, possédant des parois latérales (3, 4, 5) et un fond fermé (3), les fils de chaîne du tissu constituant les parois latérales s'étendant suivant la hauteur du récipient et une paroi latérale (3) présentant une région (11) dans laquelle la résistance de la chaîne par unité de largeur est plus grande que sur au moins la majeure partie du restant de la paroi latérale, région à laquelle les moyens de levage (2) sont fixés, caractérisé en ce qu'il comporte un joint (7) qui s'étend le long de deux pièces de tissu (3, 4) constituant les parois latérales le long des lisières de ces pièces, une région de chaîne de plus grande résistance (11, 12) étant prévue adjacente aux lisières respectives des pièces (3, 4) où ces pièces sont réunies et se terminant au droit de ces lisières, et les moyens de levage (2) étant attachés aux parois latérales dans ces régions.
2. Récipient suivant la revendication 1, caractérisé en ce que les régions de chaîne de plus grande résistance (11, 12) adjacentes au joint (7) sont mises sous la forme d'un bourrelet d'une épaisseur de matière au moins double qui fait saillie sur les parois latérales (3, 4), les moyens de levage (2) étant fixés à ce bourrelet.
3. Récipient suivant la revendication 2, caractérisé en ce que les moyens de levage (2) comprennent une boucle ayant deux branches (9, 10), les branches étant cousues au bourrelet.
4. Récipient suivant la revendication 1, 2, ou 3, caractérisé en ce qu'il est composé de trois portions de tissu (3, 4, 5) dont une (3) est en forme de U de manière à former une première et une deuxième parois latérales et le fond du récipient tandis que les deux autres (4, 5) sont fixées en travers des extrémités de la portion en U de manière à former une troisième et une quatrième parois latérales, des régions de chaîne de plus grande résistance (11, 12) s'étendant le long de chacune de ces trois portions, à proximité des deux lisières de ces portions.
5. Récipient suivant la revendication 4, caractérisé en ce que des moyens de levage (2) sont prévus à chacun des quatre angles du récipient.
6. Récipient souple pour matières en vrac, en tissu, ayant des parois latérales (3, 4, 5; 13) et un fond fermé (3, 14) les fils de chaîne du tissu constituant les parois latérales s'étendant suivant la hauteur du récipient et une paroi latérale (3, 4; 13) présentant une région (11, 12; 15) dans laquelle la force de la chaîne par unité de largeur est plus grande que sur au moins la majeure partie du reste de la paroi latérale, région à laquelle sont fixés des moyens de levage (2), caractérisé en ce que, à partir de chaque région (11, 12; 15), est formé un bourrelet en une matière d'épaisseur au moins double, qui fait saillie sur la paroi latérale (3, 4; 13) et les moyens de levage (2) sont attachés à ce bourrelet.
7. Récipient suivant la revendication 6, caractérisé en ce que les moyens de levage (2) comprennent une boucle ayant deux branches (9, 10) reliées au bourrelet par couture.
8. Récipient suivant la revendication 7, caractérisé en ce que les branches (9, 10) de la boucle (2) sont à cheval sur le bourrelet.
9. Récipient suivant la revendication 6, 7, ou 8, caractérisé en ce que le bourrelet est formé par une région (15) pincée extérieurement qui est formée dans une portion de tissu continue (13).
10. Récipient souple pour matières en vrac, en tissu tissé ayant des parois latérales (3, 4, 5) et un fond fermé (3), les fils de chaîne du tissu constituant les parois latérales s'étendant suivant la hauteur du récipient et une paroi latérale (3, 4, 5) ayant une région (11, 12) dans laquelle la force de la chaîne par unité de largeur est plus grande que sur au moins la majeure partie du reste de la paroi latérale, région à laquelle des moyens de levage (2) sont fixés, caractérisé en ce que le récipient est constitué par trois portions de tissu tissé (3, 4, 5) dont une (3) a à peu près la forme d'un U et forme une première et une deuxième parois latérales et le fond du récipient, les fils de chaîne de cette portion (3) s'étendant entre la deuxième et la troisième parois latérales et en travers du fond et dont les deux autres (4, 5) sont montées en travers des extrémités de la portion en U et forment une troisième et une quatrième parois latérales, chacune desdites portions comprenant une région (11, 12) de plus grande résistance de chaîne qui s'étend suivant sa longueur, les moyens de levage (2) étant attachés à ces régions.
11. Récipient suivant la revendication 10, caractérisé en ce que chacune desdites portions (3, 4, 5) comprend une paire de régions (11,12) de plus grande résistance de chaîne sur ses côtés opposés.
12. Récipient suivant l'une quelconque des revendications précédentes, caractérisé en ce que les fils de chaîne prévus dans la ou chaque région (11, 12; 15) de plus grande résistance de chaîne sont d'une plus haute résistance qu'ailleurs.
13. Récipient suivant la revendication 12, caractérisé en ce que les fils de chaîne contenus dans la ou chaque région (11, 12; 15) de plus grande résistance de chaîne sont des fils de polypropylène du type constitué par une pellicule gaufrée au rouleau et les fils de chaîne des autres régions sont constitués par un ruban de polypropylène.
14. Récipient suivant l'une quelconque des revendications précédentes, caractérisé en ce que les fils de chaîne contenus dans la ou chaque région (11, 12; 15) de plus grande résistance de chaîne sont plus serrés qu'ailleurs.
15. Récipient suivant les revendications 13 et 14, caractérisé en ce que les fils réalisés à partir de pellicule gaufrés au rouleau sont tissés par paires et passent au-dessus et au-dessous de deux fils de trame à la fois.
EP78300256A 1977-08-06 1978-08-07 Récipient flexible pour matière en vrac Expired EP0000838B1 (fr)

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
GB2580078 1978-05-31
GB2579878 1978-05-31
GB2579978 1978-05-31
GB2579978 1978-05-31
GB2580078 1978-05-31
GB2579878A GB1604212A (en) 1978-05-31 1978-05-31 Flexible containers

Publications (2)

Publication Number Publication Date
EP0000838A1 EP0000838A1 (fr) 1979-02-21
EP0000838B1 true EP0000838B1 (fr) 1981-12-23

Family

ID=27546702

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78300256A Expired EP0000838B1 (fr) 1977-08-06 1978-08-07 Récipient flexible pour matière en vrac

Country Status (7)

Country Link
US (1) US4207937A (fr)
EP (1) EP0000838B1 (fr)
AT (1) AT382582B (fr)
CA (1) CA1095470A (fr)
DE (1) DE2861452D1 (fr)
FI (1) FI61169C (fr)
PT (1) PT68389A (fr)

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Also Published As

Publication number Publication date
PT68389A (en) 1978-09-01
AT382582B (de) 1987-03-10
FI782410A (fi) 1979-02-07
US4207937A (en) 1980-06-17
FI61169B (fi) 1982-02-26
CA1095470A (fr) 1981-02-10
DE2861452D1 (en) 1982-02-11
ATA567278A (de) 1986-08-15
FI61169C (fi) 1982-06-10
EP0000838A1 (fr) 1979-02-21

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