EP0366375A1 - Conteneurs souples pour matières en vrac - Google Patents

Conteneurs souples pour matières en vrac Download PDF

Info

Publication number
EP0366375A1
EP0366375A1 EP89310839A EP89310839A EP0366375A1 EP 0366375 A1 EP0366375 A1 EP 0366375A1 EP 89310839 A EP89310839 A EP 89310839A EP 89310839 A EP89310839 A EP 89310839A EP 0366375 A1 EP0366375 A1 EP 0366375A1
Authority
EP
European Patent Office
Prior art keywords
yarns
yarn
wall part
bag portion
flexible intermediate
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Withdrawn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
EP89310839A
Other languages
German (de)
English (en)
Inventor
George Arthur Guild
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.)
BULKBAG Ltd
Original Assignee
BULKBAG 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
Application filed by BULKBAG Ltd filed Critical BULKBAG Ltd
Publication of EP0366375A1 publication Critical patent/EP0366375A1/fr
Withdrawn legal-status Critical Current

Links

Images

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]

Definitions

  • flexible intermediate bulk containers are made of woven fabric material such as woven polypropylene or polyethylene fabrics which may be uncoated, coated or laminated fabrics.
  • a flexible intermediate bulk container loaded with powdered material is subsequently dropped from a height, either deliberately or unintentionally, the bag portion of the flexible intermediate bulk container is liable to burst, often at a point about one third of the height of the bag from the point of contact with the ground.
  • the burst occurs because at least one of the horizontal yarns in a wall part of the woven fabric material is subjected to a longitudinal tensile stress greater than its breaking load. When a yarn breaks due to such tensile stress, the break becomes a split spreading through the woven fabric material and resulting in part or all of the contents of the container being discharged.
  • a flexible intermediate bulk container made from standard polyester yarns of 2000 denier is substantially stronger than a similar container made from polypropylene yarns of 2000 denier, but is of the order of two to three times the cost.
  • this object can be achieved by providing, at intervals in the yarns which lie horizontally in the wall of the flexible intermediate bulk container when the container is in use (usually the weft yarns of the woven fabric material), a yarn element stronger than the standard yarns used in the woven fabric.
  • a stronger yarn element is defined as a yarn element capable of bearing a significantly higher load before break (at least 50% greater) than the conventionally used yarns such as polypropylene or polyethylene yarns.
  • the stronger yarn element is capable of bearing at least twice the load before break that wll be borne by conventionally used, or standard, yarn elements which will continue to be used as the other horizontal yarns in the wall of the container.
  • the stronger yarn element is provided by a straight forward substitution of a stronger yarn element for a standard yarn element, the stronger yarn element being provided in a number of different ways, either as a single yarn or a plurality of yarns as will be described below.
  • the stronger yarn element may be provided by allowing two or more of the standard yarns to lie together and be woven into the fabric as one, thus effectively replacing a standard yarn by a thicker yarn.
  • a similar effect can be achieved by retaining the standard yarn and introducing a yarn of another material to lie with the standard yarn and be woven into the fabric as one with the standard yarn.
  • the stronger yarn element may be provided by substituting, for a standard yarn, either a yarn of similar or greater size to the standard yarns but made of a material of greater strength, for example a polyester yarn may be substituted for a polypropylene yarn in a woven polypropylene fabric, or a yarn of the same material as the standard yarns but of a higher denier, for example a polypropylene yarn of 3000 denier or 4000 denier where the standard yarns are 2000 denier polypropylene.
  • the introduction of the stronger yarn element provides a tougher area in the woven fabric.
  • the tougher area may, however, be created by providing, not one yarn element of greater strength in each tougher area as described above, but by providing, in place of a plurality of adjacent standard yarns, a plurality of adjacent parallel yarns of greater strength in each tougher area, the stronger yarn elements being such as those used in all the alternatives mentioned above.
  • the fabric which is used in the wall part of the bag portion of a flexible intermediate bulk container according to this invention is not novel in itself. Fabrics with stronger yarns present among the standard yarns have previously been proposed and used in a "rip-stop" context, for example, in order to prevent tearing of a fabric from a point of weakness.
  • the function of the stronger yarns in a flexible intermediate bulk container according to the present invention is to absorb shock tensile loads arising when a loaded container is dropped and to provide a cushioning effect for the standard fabric yarns against the resultant sudden surge in hoop stress.
  • the wall part of the bag portion of a flexible intermediate bulk container according to the present invention has an improved ability to absorb longitudinal tensile stress in the horizontal direction thereby substantially reducing the tendency of a container to burst, and is not concerned with limiting the extent of a tearing action as in the "rip-stop" feature acknowledged above.
  • a similar parallel series of tougher areas formed by stronger yarn elements may be created additionally in the other (usually the warp) direction of the weave of the woven fabric material constituting the bag portion of the flexible intermediate bulk container.
  • These tougher areas which will extend vertically and parallel to one another in the wall of the container, will be formed in similar manner to that described for the tougher horizontal areas in the wall of the container, and will provide for absorption of shock tensile loads which may occur in the vertical direction in the wall part of the container, if the container does not fall vertically to a point of impact.
  • the woven fabric material from which the bag portion of the flexible intermediate bulk container is made is effectively divided into small areas of fabric woven from standard yarns and separated from one another by regions in which at least one standard yarn has been substituted by a stronger yarn element.
  • a flexible intermediate bulk container comprising a bag portion formed from a woven fabric material comprising first yarns extending down the height of a wall of the bag portion and second yarns extending substantially at right angles to the first yarns in a wall of the bag portion, the said second yarns including yarns of substantially greater strength than the majority of said second yarns, the yarns of substantially greater strength being arranged in the woven fabric to provide regions of greater strength spaced at intervals throughout the woven fabric.
  • the said first yarns in the flexible intermediate bulk container may include yarns of substantially greater strength than the majority of said first yarns arranged in the woven fabric to provide regions of greater strength extending vertically and spaced at intervals throughout the woven fabric.
  • the present invention may be practised in a flexible intermediate bulk container of any shape formed from woven fabric material.
  • the present invention is particularly advantageously employed in a flexible intermediate bulk container which includes a bag portion formed from a base part and a single wall part secured to the base part.
  • the single wall part is a fabric woven on a circular loom so that the horizontal or weft threads run continuously through the fabric and there are no areas where adjacent sections of the wall part of the bag portion are joined together by stitching as in the known flexible intermediate bulk container which comprises a rectangular bag portion having four side walls and a base.
  • the present invention does have application in this latter form of flexible intermediate bulk container and will enhance the performance of such a container, it is preferred that the invention be employed in a flexible intermediate bulk container having a single wall part.
  • a flexible intermediate bulk container comprising a bag portion, which has a base part and a single wall part secured to the base part, and a plurality of lifting loops fastened to the single wall part of the bag portion, the bag portion being formed from woven fabric material which includes a region of greater strength than the majority of the woven fabric material, the region of greater strength extending continuously around the wall part of the bag portion so as to provide, in any vertical section of the wall part, regions of greater strength at a plurality of different distances from the junction of the wall part with the base part.
  • a flexible intermediate bulk container which comprises a bag portion 1 to which four lifting loops 2 are attached.
  • the bag portion 1 is formed from a substantially U-shaped piece 3 of woven fabric material which forms two sides and the base of the bag portion and two rectangular pieces 4 and 5 of woven fabric material forming the other two sides of the bag portion 1.
  • the three pieces of woven fabric material are joined by stitching along the seams and the loops 2 are also secured to the bag portion by stitching.
  • the woven fabric material from which the three pieces of fabric 3, 4 and 5 are constituted may be a woven polypropylene fabric with fifteen threads of 2000 denier polypropylene tape per inch in the warp or vertical direction, and twelve threads of 2000 denier polypropylene tape per inch in the weft or horizontal direction.
  • the pieces 3, 4 and 5 of woven fabric material include regions 6 of greater strength which extend horizontally in each of the walls of the bag portion 1. These regions 6 may be comprised by a single weft thread or yarn of greater strength than the 2000 denier polypropylene yarns and substituted for one of the weft yarns 12 shown in Figure 2, the substituted yarns occurring at intervals of about one inch (2.5 cms).
  • the substituted weft yarn is a 2000 denier polyester yarn which has a tenacity of 8 to 10 Cn/dtex as compared with a tenacity of the order of 4 to 6 Cn/dtex for the 2000 denier polypropylene yarns.
  • Polyester yarn has a specific gravity of 1.38 whereas the specific gravity of polypropylene yarn is 0.922. Therefore, a polyester yarn is about twice as strong as a polypropylene yarn of the same dimensions.
  • the 2000 denier polypropylene yarn may be substituted by a 3000 denier polypropylene yarn or a 4000 denier polypropylene yarn.
  • a pair of 2000 denier polypropylene yarns may be woven into the fabric in the place of a single weft yarn 12.
  • a 2000 denier polypropylene yarn and either a 1000 denier polyester yarn or a 2000 denier polyester yarn may be woven into the fabric in the place of a single weft yarn 12.
  • FIG. 3 of the accompanying drawings there is shown a preferred embodiment of flexible intermediate bulk container according to the present invention which has a circular bag portion 20 formed from a circular base part of woven fabric material and a single wall part 21 of woven fabric material which is joined at its lower edge to the circular base part.
  • Four lifting loops 22 are attached to the bag portion 20.
  • the bag portion 21 of the embodiment of Figure 3 further differs from the bag portion 1 of Figure 1 in that the woven fabric from which the bag portion is made includes vertical regions 7 of greater strength in addition to the horizontal regions 6 of greater strength.
  • the vertical regions 7 are formed by effecting a substitution of a warp yarn 11 by a stronger yarn element in similar manner to that already described for the substitution of a weft yarn 12 in the formation of the regions 6.
  • the base part (not shown) of the bag portion 20 may also include first and second series of regions (similar to regions 6 and 7) of greater strength than the majority of the woven fabric material of the circular base portion.
  • cylindrical bag portion 20 may have only horizontal regions 6 of greater strength in the wall part 21, as in another preferred embodiment of the invention illustrated in Figure 4.
  • FIG 4 there is shown another flexible intermediate bulk container having a bag portion of which the wall part 21 is made in a single piece in a conventional manner on a circular loom.
  • the single wall part 21 is secured to a rectangular base part of woven fabric material (not shown) so that the resultant container is of generally rectangular shape with rounded corners.
  • the wall part 21 includes horizontal regions 6 of greater strength resulting from the use of a thicker polyester yarn in place of a standard weft polypropylene yarn as will be described below.
  • the preferred woven fabric for the single wall part 21 of the flexible intermediate bulk container according to Figure 4 comprises a woven polypropylene fabric with six threads of 3000 denier polypropylene tape per inch (2.5 cms) in the warp or vertical direction, and ten threads of 2400 denier polypropylene tape per inch (2.5 cms) in the weft or horizontal direction, one in every eight of the weft threads being replaced by a 6000 denier twisted multifilament polyester yarn.
  • This woven fabric is made on a circular loom having eight shuttles laying the weft threads continuously, seven of the shuttles feeding the standard polypropylene yarn and the eighth shuttle feeding the stronger polyester yarn. Because the woven fabric for the wall part 21 is made on a circular loom, the horizontal regions 6 of greater strength are constituted by a continuous polyester thread running through the fabric of the wall part 21 and reappearing at different heights in any vertical section of the wall part 21.
  • the technical effect in the woven fabric employed in a wall part of a flexible intermediate bulk container lies in the enhancement of the ability of the fabric to absorb longitudinal tensile stresses applied in the weft direction.
  • FIG. 5 is a diagrammatic comparative representation of the stress/strain curves I and II showing the percentage extension E resulting from an applied load L for polypropylene yarns and for polyester yarns respectively.
  • the situation depicted is of the application of a shock hoop load D which results from a drop, and which lies between the ultimate, or breaking, load U of the polypropylene yarns and the ultimate, or breaking, load V for the polyester yarns.
  • the extension occurring in the fabric yarns as a result of the drop load D is limited by the higher modulus polyester yarns, with the result that the polypropylene yarns are extended by only about 10% against a notional extension of about 25% which would have ruptured the polypropylene yarns.
  • a pair of adjacent yarns may be substituted by a pair of stronger yarn elements with a gap of the order of 1.5 centimetres between the pairs of stronger yarn elements. It may be preferred to make the regions of greater strength in the woven fabric even larger by substituting three, or even four, adjacent yarns by a corresponding number of stronger yarn elements.
  • the woven fabric for the single wall part of the flexible intermediate bulk container of Figure 4 would then be made with two, three or four adjacent shuttles supplying polyester yarn and the other shuttles feeding polypropylene yarn into the weft of the fabric.
  • the interval or gap between the regions of greater strength, whether in the warp or the weft direction, may also be increased or decreased, for example to an interval of one centimetre.
  • polyester yarns of the same denier as, or a greater denier than, the standard polypropylene yarns may be supplied by alternate shuttles so that the stronger regions constituted by the polyester yarns alternate with the standard polypropylene yarns.
  • the present invention has application in flexible intermediate bulk containers in which the lifting loops are formed integrally with the wall part or parts of the container, instead of being separate pieces of material stitched to the wall part.
  • the methods of making both rectangular and cylindrical containers with such integral lifting loops are well known and may readily be applied to containers in accordance with the present invention.
  • the essence of the present invention is the provision of the horizontal regions of greater strength in the wall part or each wall part of a flexible intermediate bulk container. These horizontal regions of greater strength ensure that, when a sudden shock hoop load is applied as a result of a drop, the effect of this load on the standard yarns is cushioned and the resistance of the flexible intermediate bulk container to bursting is significantly increased.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Woven Fabrics (AREA)
  • Bag Frames (AREA)
EP89310839A 1988-10-21 1989-10-20 Conteneurs souples pour matières en vrac Withdrawn EP0366375A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8824693 1988-10-21
GB888824693A GB8824693D0 (en) 1988-10-21 1988-10-21 Flexible intermediate bulk containers

Publications (1)

Publication Number Publication Date
EP0366375A1 true EP0366375A1 (fr) 1990-05-02

Family

ID=10645583

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89310839A Withdrawn EP0366375A1 (fr) 1988-10-21 1989-10-20 Conteneurs souples pour matières en vrac

Country Status (2)

Country Link
EP (1) EP0366375A1 (fr)
GB (2) GB8824693D0 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2708250A1 (fr) * 1993-06-30 1995-02-03 Morishita Chem Ind Sac souple.

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9313802D0 (en) * 1993-07-03 1993-08-18 Mulox Ibc Ltd Container bag
RS58223B1 (sr) 2014-02-13 2019-03-29 Starlinger & Co Gmbh Savitljivi posredni kontejner za rasute terete (fibc)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR743414A (fr) * 1933-03-29
FR1443272A (fr) * 1965-05-10 1966-06-24 Saint Freres Container parallélépipédique souple
DE1535634A1 (de) * 1965-12-21 1970-05-14 Sanders & Soehne J B Schwergewebe mit Gewebeverstaerkung
GB2022054A (en) * 1978-06-01 1979-12-12 Norsk Hydro As Reinforced flexible containers
GB1591091A (en) * 1977-01-10 1981-06-17 Miller Weblift Ltd Containers

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2059915B (en) * 1979-10-06 1983-04-07 Miller Weblift Ltd Flexible containers
GB2194216B (en) * 1986-07-15 1990-02-28 Tay Textiles Ltd Flexible bulk containers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR743414A (fr) * 1933-03-29
FR1443272A (fr) * 1965-05-10 1966-06-24 Saint Freres Container parallélépipédique souple
DE1535634A1 (de) * 1965-12-21 1970-05-14 Sanders & Soehne J B Schwergewebe mit Gewebeverstaerkung
GB1591091A (en) * 1977-01-10 1981-06-17 Miller Weblift Ltd Containers
GB2022054A (en) * 1978-06-01 1979-12-12 Norsk Hydro As Reinforced flexible containers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2708250A1 (fr) * 1993-06-30 1995-02-03 Morishita Chem Ind Sac souple.

Also Published As

Publication number Publication date
GB2224006A (en) 1990-04-25
GB8824693D0 (en) 1988-11-30
GB8923675D0 (en) 1989-12-06

Similar Documents

Publication Publication Date Title
US4610028A (en) Bulk containers
EP0505447B1 (fr) Ameliorations concernant les recipients de matiere en vrac
EP1609899B1 (fr) Courroie de transport avec tissu entrelacé à résistance élevée
US4362199A (en) Flexible containers
US4730942A (en) Flexible bulk containers
US4807299A (en) Bulk containers
EP0027309A1 (fr) Fabrication de containers souples
CA1061682A (fr) Courroies tissees
JPH08244405A (ja) 衝撃遮断または差し込み継手用のモックレノ織布を有するベルト構造
EP0366375A1 (fr) Conteneurs souples pour matières en vrac
EP0332333A1 (fr) Conteneur de sac
KR0155953B1 (ko) 공기 백
KR100459362B1 (ko) 체인 톱으로부터 보호하기 위한 직물
KR100791148B1 (ko) 안전로프원단
KR20220095111A (ko) 충격 흡수 기구
US5518314A (en) Flexible container
JP3239463U (ja) ショックアブソーバ
EP0456328A2 (fr) Grand réceptacle souple
JP2722335B2 (ja) エネルギー吸収ユニット
GB2194770A (en) Bags having lifting loops
EP0119743A1 (fr) Conteneur en forme de sac
KR102537382B1 (ko) 포이엘라 튜브밴드를 구비한 충격흡수죔줄
AU640986C (en) Improvements relating to bulk containers
WO2001007340A1 (fr) Sac recipient
KR20060018303A (ko) 복수본 경사 보강부가 형성된 마대

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19901003

17Q First examination report despatched

Effective date: 19920217

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19920828