EP0111852A2 - Conteneur souple pour le transport et le stockage de produits pulvérulents et méthode de construction - Google Patents

Conteneur souple pour le transport et le stockage de produits pulvérulents et méthode de construction Download PDF

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Publication number
EP0111852A2
EP0111852A2 EP83112416A EP83112416A EP0111852A2 EP 0111852 A2 EP0111852 A2 EP 0111852A2 EP 83112416 A EP83112416 A EP 83112416A EP 83112416 A EP83112416 A EP 83112416A EP 0111852 A2 EP0111852 A2 EP 0111852A2
Authority
EP
European Patent Office
Prior art keywords
piece
container
line
joints
cut
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.)
Withdrawn
Application number
EP83112416A
Other languages
German (de)
English (en)
Other versions
EP0111852A3 (fr
Inventor
Anders Juel
Olaf Strand
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.)
Norsk Hydro ASA
Original Assignee
Norsk Hydro ASA
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 Norsk Hydro ASA filed Critical Norsk Hydro ASA
Publication of EP0111852A2 publication Critical patent/EP0111852A2/fr
Publication of EP0111852A3 publication Critical patent/EP0111852A3/fr
Withdrawn legal-status Critical Current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

  • the present invention relates to flexible containers for transport and storage of bulk material, especially pulverant or granular material.
  • the invention also comprises a method for manufacture of such a container.
  • the container comprises integrated lifting loops, filling opening, a central part and a bottom section.
  • the container can be equipped with an inner liner of impervious material.
  • Flexible containers are preferably made from one piece of woven material, for instance flat woven or round woven polypropylene.
  • the container's lifting loops are formed from a doubled piece of material in form of a closed loop which is a continuous integral alongation of the piece of material which forms the container itself.
  • the total width of the lifting loops is substantially equal to the container's circumference.
  • the container's Bottom is formed by joining together the lower part of said piece of material.
  • several flaps at the lower part of the material are made, and by joining these together in a special way a double bottom is formed.
  • the latter patent comprises also a flexible container made from round woven material and where the container's height is in the longitudinal direction of the material.
  • the container's top is joined together or closed by lashing and is lifted by means of a clamping hook, straps with a running knot or the like, whereby its lifting strength is weakened, as the strength of the material no longer can be utilized maximally during lifting of the container.
  • the container shall be carried through a so-called drop test if it shall be used for transport and storage of this type of bulk material.
  • drop test the lower part of the flexible container will be exposed to especially high strain along the circumference, as one will have a radial bursting effect perpendicularly.on the container's vertical axis when the container is exposed to this drop test.
  • this zone will be defined as the bursting zone, which usually can extend from the container's bottom and upward to about half of its height in filled condition. How large part of the container will be exposed to this extra strain, depends on the properties of the material to be transported.
  • Too weak containers will rupture in the bursting zone when they are exposed to the drop test.
  • Flexible containers having one or several side seams will generally have a lower strength in the bursting zone than containers made from round woven material because the basic material is weakened along the circumference of the side seams. It is, however, possible to make containers meeting these requirements of the drop test by overdimensioning the quality of the material for making the container, but such a large overdimensioning will not be very economic.
  • the object of the present invention was to arrive at an improved flexible container having integrated lifting loops and which had a cylindrical part which could endure the strain the container would be exposed in the bursting zone during a drop test.
  • Said container should at the same time have the same advantages regarding high lifting strength and strong bottom construction for distributing the strain on the container in a favourable way.
  • a further object was to arrive at a construction which would allow application of round woven material, as application of round woven material has certain advantages, for instance during manufacture.
  • the inventors first considered the relative importance of the advantages and disadvantages of the known flexible containers in order to sort out which properties had to be improved and if this could be done without sacrificing reduction of the container's positive properties.
  • One of the most important advantages of the previously mentioned container having integrated lifting loops, is their high lifting strength. It was row surprisingly found that by manufacturing the container in a special way from a hose-formed material, it could be obtained containers having high strength in the bursting zone at the same time as they had lifting loops with sufficiently high lifting strength.
  • a flexible container according to the invention was made from a hose-formed material which was cut at one of its ends such that a substantial part of the cutting deviated from the longitudinal and transveral direction of the material, i.e. the woven material's warp and weft.
  • the hose-formed material was folded transversally and the edges of the cuts were joined together, for instance ty seaming, such that a container was formed having integrated lifting loops in its upper part and a cylindrical part between the lifting loops and a bottom section which was formed as known per se, for instance according to US 4.136.723.
  • the most important feature of the flexible container according to the invention is the way it is joined together in order to form lifting loops and connect them with the cylindrical part of the container.
  • the lifting strength of the container is reduced corresponding to the difference between the strength of the woven material and the strength of the joints.
  • the strength of the material is normally reduced by strain transversally of the joining d irec- tion with 50-70% when there is a seam in the woven material.
  • an angle x less than 90° the length of the joints will be increased such that the imposed weakening, by cutting the material and then joining it together again, to a great extent will be counteracted.
  • fig. 1 In fig. 1 is shown two round woven basic materials (1) from a hose-formed material which is cut along the lines a, a', b' and b and where the cutting lines a, a' and b' b form angles x with the warp in a round woven material.
  • the cutting lines a'-b' will contrary to this follow the weft in the material.
  • the basic material (1) there can be made a cut across the folding line (2) for a central filling opening (3).
  • the cuts (4) will make it possible to form a double bottom such as described in US 4.136.723.
  • the basic material (1) is folded over the folding line (2) as long as necessary for getting the joints of a, a' to overlap with b, b', and lifting loops (5) are formed.
  • the lowest point (B) in the V-formed joint (8) lies preferably above the bursting zone (9) as shown on fig. 3.
  • the points at the extremes of the V-formed joint (8) are designated (B I ).
  • the joints can be made by seaming, gluing, melt3ng the joints together or in any other suitable way.
  • the container's bottom is made as known per se.
  • the container can also be made by making the cut line a'-b' equal to 0, i.e. the piece of material (1) is cut directly from a to b. The joints are thereby drawn into the top of the lifting loops (5) and cuts corresponding to the length of the lifting loops must be made in the basic material (1).
  • the container can also be made by prolonging the cut lines a'-b' beyond the crossing of a, b' with b, b' as shown by the dotted line (11) on fig. 1, in order to prolong the opening (6) and thereby the lifting loops.
  • the container can also be made with shortened openings (6) for the lifting loops by continuing the joints from a', b' (fig. 2) and a'', b'' (fig. 6) in the direction of the folding line (2) such that one obtains side joints in the upper part of the central section of the container.
  • the container can also be made by letting the cut lines a, a', b, b' form curves or joined pieces of cuts which form angles with the longitudinal direction of the material different from the angle x as long as the joining line between the cut lines' starting and end point forms an angle x with the longitudinal direction of the material piece (1) and the cut lines substantially cover each other after being folded over the folding line (2).
  • F ig. 4 shows a round woven basic piece of material, double folded as shown in fig. 5, with folding lines (10). Said piece of material is then cut up in the same way as shown in fig. 1.
  • the basic material (1) is folded out again after having been cut up along the lines a, a', b' b', it will be in the form shown in fig. 6.
  • the flaps above the folding line (2) are folded around this one and joined along the cut lines, one will obtain a joining line (8) in the form of a W with the extreme points at (B") and its lowest points at (B).
  • Fig. 7 shows a container made from the material shown in fig. 4 and with joining lines (8) for formation of lifting loops (5). As can be seen from fig.
  • this container is not shown with a central filling opening.
  • a container can be filled with bulk material through one of the side openings (6), but it can also be equipped with a central filling opening (3). Also for containers according to fig. 3 bulk material can be filled through the side openings (6) and application of a central filling opening (3) can be avoided.
  • the joint (8) will then occur on each of their sides of the lifting loop (5) such that the lowest point (B) or (B', B'') of the joints (8) will not extend as far down on the cylindrical part (12) that there is any risk that the joint (8) get down into the bursting zone (9).
  • the lowest point (B) can be kept at a constant height above the bottom (7) for such containers by varying the relation between length and width when applying V- or W-formed joints (8) having a constant angle x.
  • the invention is, however, not limited to these values, because, among other things, the flowability of the material which shall be filled in the container will influence on the point for the largest bursting effect during the drop test. The flowability will also influence on the angle the container's walls will form with the container's vertical centre line when the container is lifted with its lifting loops joined in a lifting hook. The distribution of strain in the flexible container will accordingly vary with the type of material filled into it. Therefore it will be advantageous to adjust according to the flowability of the material which shall be transported in the container.
  • Containers V and VI according to the invention can contrary to this be exposed to 76% of the strain which the container without a seam in the lifting loops can endure.
  • Containers VII and VIII are containers of the same type as V and VI, but having other elastic properties in the joints. On the average these can be exposed to 85% of the strain.
  • the flexible container according to the invention combines not just the requirements to high tensile strength and high strains in the bursting zone, but it is also simple to manufacture and it does not require more material than containers to which it is compared here.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Packages (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Making Paper Articles (AREA)
EP83112416A 1982-12-10 1983-12-09 Conteneur souple pour le transport et le stockage de produits pulvérulents et méthode de construction Withdrawn EP0111852A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO824157 1982-12-10
NO824157A NO151279C (no) 1982-12-10 1982-12-10 Storsekk med integrerte loeftestropper samt fremgangsmaate til dens fremstilling

Publications (2)

Publication Number Publication Date
EP0111852A2 true EP0111852A2 (fr) 1984-06-27
EP0111852A3 EP0111852A3 (fr) 1985-10-30

Family

ID=19886852

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83112416A Withdrawn EP0111852A3 (fr) 1982-12-10 1983-12-09 Conteneur souple pour le transport et le stockage de produits pulvérulents et méthode de construction

Country Status (8)

Country Link
EP (1) EP0111852A3 (fr)
CA (1) CA1215001A (fr)
DK (1) DK566983A (fr)
ES (1) ES285028Y (fr)
FI (1) FI69436C (fr)
NO (1) NO151279C (fr)
PT (1) PT77801B (fr)
TR (1) TR22005A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4989792A (en) * 1988-02-26 1991-02-05 Nordson Corporation Valve arrangement for intermittent application of a fluid adhesive to a substrate
WO2003051780A1 (fr) 2001-12-17 2003-06-26 Ebac Limited Distributeurs de liquide mis en bouteille

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
No relevant documents have been disclosed *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4989792A (en) * 1988-02-26 1991-02-05 Nordson Corporation Valve arrangement for intermittent application of a fluid adhesive to a substrate
WO2003051780A1 (fr) 2001-12-17 2003-06-26 Ebac Limited Distributeurs de liquide mis en bouteille

Also Published As

Publication number Publication date
TR22005A (tr) 1986-01-02
ES285028U (es) 1985-07-16
FI834476A7 (fi) 1984-06-11
PT77801B (en) 1986-03-20
NO824157L (no) 1984-06-12
DK566983A (da) 1984-06-11
EP0111852A3 (fr) 1985-10-30
FI69436B (fi) 1985-10-31
DK566983D0 (da) 1983-12-09
FI69436C (fi) 1986-02-10
CA1215001A (fr) 1986-12-09
NO151279C (no) 1985-03-13
PT77801A (en) 1984-01-01
ES285028Y (es) 1986-04-01
NO151279B (no) 1984-12-03
FI834476A0 (fi) 1983-12-07

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Effective date: 19870210

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Inventor name: STRAND, OLAF

Inventor name: JUEL, ANDERS