EP0158361A2 - Flexibler Behälter zum Transport und Lagern von Schüttgut - Google Patents

Flexibler Behälter zum Transport und Lagern von Schüttgut Download PDF

Info

Publication number
EP0158361A2
EP0158361A2 EP85104429A EP85104429A EP0158361A2 EP 0158361 A2 EP0158361 A2 EP 0158361A2 EP 85104429 A EP85104429 A EP 85104429A EP 85104429 A EP85104429 A EP 85104429A EP 0158361 A2 EP0158361 A2 EP 0158361A2
Authority
EP
European Patent Office
Prior art keywords
adhesive
sack
flexible container
folds
zones
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Withdrawn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
EP85104429A
Other languages
English (en)
French (fr)
Other versions
EP0158361A3 (de
Inventor
Kurt Larsen
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.)
Nyborg Plast AS
Original Assignee
Nyborg Plast AS
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 Nyborg Plast AS filed Critical Nyborg Plast AS
Publication of EP0158361A2 publication Critical patent/EP0158361A2/de
Publication of EP0158361A3 publication Critical patent/EP0158361A3/de
Withdrawn legal-status Critical Current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]
    • B65D88/1618—Flexible intermediate bulk containers [FIBC] double-walled or with linings

Definitions

  • the invention relates to a flexible container for transporting and storing bulk goods and comprising an outer sack of a strong and load bearing material, preferably plastics, and an inner sack of an impervious material, preferably plastics, and which initially is loose.
  • the outer sack is usually made of a woven material such as for instance flat-woven or tubed polypropylene ensuring the necessary strength of the container.
  • This material is, however, not quite impervious. Consequently, when the container is to be used for instance for hygroscopic products, it is necessary in order to ensure imperviousness to use within the outer sack an inner liner in the form of an inner sack of a relatively thin, but impervious material such as for instance 100 micron polyethylene.
  • This inner sack is the part of the container which directly touches the bulk goods.
  • the small thickness and particular quality of the wall of the inner sack imply that the latter is unable to receive the load exerted by the bulk goods, the weight of said bulk goods resting on the inner side of the inner sack.
  • the forces of the above load are therefore transferred as usual forces from the wall of the inner sack to the wall of the outer sack, said walls abutting one another.
  • the bulk goods flow along the wall of the inner sack, which is thereby subjected to forces extending in the plane of the wall.
  • the low coefficient of friction between the plastic materials used implies that these forces cannot be transferred from the wall of the inner sack to the wall of the outer sack to a significant degree.
  • the inner sack must therefore be secured separately to the outer sack in such a manner that it is not torn off completely or partially together with the bulk goods during the emptying procedure, said bulk goods thereby unintentionally being polluted. Furthermore, the inner sack must be kept in position relative to the outer sack during the filling procedure so that bulk goods cannot unintentionally leak out between the two sacks for instance by parts of the inner sack being crumpled up.
  • GB-PS No. 1,536,237 discloses a flexible container of this type. Both the outer and the inner sack of this container comprise from the beginning a bottom opening for the emptying of the bulk goods. During the transport and the storage of bulk goods the bottom opening of the inner sack is tightly closed and the same applies to the upper opening. At the upper opening the inner sack is secured by its rim portion to the outer sack. When the container is to be emptied it is raised and the bottom opening of the inner sack is opened so as to allow the bulk goods to leave. During this procedure the inner sack is secured by its rim portion to the outer sack.
  • the object of the present invention is to provide a flexible container of the above type which is less expensive to manufacture, easier to use, requires less work, and which comprises a more reliable connection between the inner and the outer sack during the filling and emptying procedure than previously, so that the inner sack does not follow the bulk goods nor is optionally torn loose from the outer sack during the filling and emptying procedure.
  • the flexible container for transporting and storing bulk goods is characterised in that a pressure sensitive adhesive has been applied onto one or more adhesive zones corresponding in pairs of at least one of the opposing sides of the sacks, and that each pair of adhesive zones are sealingly pressed together about said adhesive, and that the adhesive presents such a low inner cohesion force that the pairs of corresponding adhesive zones can be separated completely or partially when the inner sack is expanded within the outer sack for instance by means of blast air or through filling in of bulk goods, the cohesiveness being of such a magnitude that the adhesive connection established between the outer sack and the inner sack when the latter at the termination of its expansion is pressed towards the adhesive now uncovered on the adhesive zones is capable of transferring the forces that the inner sack is subjected to during the filling and emptying of the container to the outer sack.
  • the establishment of a connection between the inner and the outer sack can substantially be carried out already during the manufacture of the sacks as the adhesive can be applied during the manufacture as a step of the production process.
  • the adhesive possesses a long open period and at the same time is sealingly positioned within the pairs of corresponding adhesive zones, its cohesiveness is maintained in such a manner that the joining of the outer and the inner sack can be carried out at any time after the manufacture for instance as a step of the filling of the container.
  • the container according to the invention is therefore inexpensive to manufacture, easy to use, and requires less work than previous containers of this type.
  • the resulting connection is also more reliable as the forces exerted on the inner sack during the filling and emptying procedure are transferred to the outer sack along the respective wall surfaces of the sacks. In this manner the risk of the inner sack following the bulk goods during the emptying of the container has been eliminated.
  • each pair of corresponding adhesive zones is formed completely or partially by the inner side of an adhesive fold made in one of the walls of the sacks, and the total surface area of the adhesive zones corresponds to 0.5-10%, preferably 1.5-7.5% of the inner surface area of the outer sack, and the pairs of connected adhesive zones sealingly pressed together about the adhesive are not separated so as to uncover the adhesive until the inner sack has expanded to such an extent that the opposing sides of the sacks free of adhesive abut one another.
  • the inner sack can easily be inserted and correctly positioned within the outer sack as it can unfold almost completely and straighten the crumpled and twisted wall portions before the respective surface portions at the opening of the adhesive zones interengage and lock the mutual position of the wall members.
  • the adhesive folds on the outer sack may project outwardly from the remaining portion of the outer side of said outer sack, and the adhesive folds on the inner sack may project inwards from the remaining portion of the inner side of said inner sack.
  • the inner sides of the respective adhesive folds of the sacks are positioned on the opposing sides of the sacks in such a manner that these sides are joined in a force transferring manner at the adhesive zones when the inner sack expands in the outer sack.
  • the adhesive folds on the outer sack may be positioned at preferably vertically extending side seams interconnecting the side members of the sack,said side seams forming the back of the adhesive folds, and the adhesive may be applied within these adhesive folds and preferably at such a distance from the side seams that the adhesive does not touch the tools nor the machinery used for the joining procedure.
  • This embodiment possesses the advantage that it is not necessary to involve extra work for forming adhesive folds in the outer sack.
  • the inner sack may comprise two adhesive folds, and these folds may preferably oppose one another when the sack is flattened.
  • the sack takes up a minimum room when flattened as the adhesive folds extend in the plane of the flattened sack. The sack is therefore easy to store and to fold or roll up.
  • one of the adhesive zones corresponding in pairs may be provided on a separate detachable cover strip of for instance cover film.
  • These adhesive zones possess the advantage that they can be formed without necessitating a folding of the walls of the sacks, and they can especially be used as a supplement to be positioned on locations of the walls of the sacks that are difficult to fold.
  • each adhesive fold on the inner sack may abut the outer sack preferably in the middle between two adhesive folds thereon, each adhesive fold on the outer sack simultaneously abutting the inner sack preferably in the middle between two adhesive folds thereon when the inner sack has expanded within the outer sack.
  • a particularly strong and reliable connection is obtained as the transfer of forces is uniformly distributed along the opposing sides of the sacks, the distance between the adhesive locations corresponding approximately to half the distance between the adhesive folds on the respective sacks.
  • the resulting adhesive connection depends on the cohesiveness of the adhesive on both sacks in such a manner that the certainty of a satisfactory adhesive connection is doubled. In order to increase the latter certainty additionally, the adhesive on the two sacks may have different characteristics.
  • the adhesive zones on the opposing sides of the sacks may abut one another when the inner sack has expanded within the outer sack.
  • the adhesive connection is very strong and reliable as the adhesion takes place between the uncovered surfaces of the adhesive itself on the respective adhesive zones.
  • the respective surface portions of the inner sack may be of an extent at least corresponding to the extent of the corresponding surface portions on the outer sack.
  • the inner sack is able to expand to such an extent that it abuts the outer sack everywhere, the adhesive connections thereby being established.
  • the adhesive may possess an open period of between two months and three years, preferably between six months and eighteen months. In this manner the adhesive maintains its cohesiveness within the usual period of application of the container, and also in cases where a pair of-corresponding adhesive zones are not unintentionally completely sealingly pressed together about the adhesive.
  • the outer sack may be subjected to a roughening treatment, whereby it is correctly positioned in a better manner than previously because it binds better on a surface having been subjected to a roughening treatment.
  • Figures 1 and 2 illustrate a flexible container 1 comprising an outer sack 2 and an inner sack 3.
  • the outer sack is made of a strong and load bearing material such as for instance flat-woven or tubed polypropylene.
  • the latter material is, however, not completely impervious and the inner sack of an impervious, relatively thin material such as for instance 100 micron polyethylene serves therefore to ensure the necessary imperviousness of the container when it for instance is to be used for hygroscopic products.
  • adhesive folds 4 are formed on the outer sack and project outwards from the outer side of the sack.
  • An adhesive 5 is applied within these folds and possesses particular properties.
  • the adhesive folds are then pressed together about the adhesive in such a manner that said adhesive is sealed within the folds and protected against outer influences for instance from the air and consequently secured against being dried out.
  • the adhesive preserves therefore its cohesiveness in such a manner that the inner sack at adhesion can be connected to the outer sack any time before the sack is to be used.
  • the adhesive possesses an open period of between two months and three years, preferably between six months and eighteen months in such a manner that the adhesive maintains its cohesiveness within the period upon the manufacture where the container is usually taken into use.
  • the inner sack 3 When the container is to be used, the inner sack 3 is pulled over a filler pipe 11, cf. Figure 1, positioned on a silo 10.
  • the sack can be secured to the filler pipe by means of a clamping band 12 during the filling of the container.
  • the filler pipe 11 and the inner sack 3 are subsequently inserted in the outer sack 2 being suspended for instance in hooks 13 by means of lifting straps 14.
  • blast air or bulk goods are filled into the inner sack 3 through the filler pipe 11, and the pressure arising on the inner side of the inner sack expands said sack in such a manner that it extends to and is tightened towards the outer sack.
  • the load on the inner sack is thereby transferred to the outer sack.
  • Figures 2 and 3 illustrate the inner sack 3 in a position where it does not yet abut the outer sack 2.
  • the loads thus influencing the outer sack 2 are preferably usual forces absorbed by reaction forces in the wall plane of the sack.
  • the adhesive is subjected to a component of a force perpendicular to the plane of the adhesive.
  • the specific cohesiveness of the adhesive is not sufficiently great to resist these components of a force, the adhesive folds are separated and the adhesive uncovered.
  • the above expansion continues until it finally abuts the uncovered adhesive on the adhesive folds now separated, cf. Figure 4, whereby an adhesive connection is established along these adhesive zones between the inner and the outer sack.
  • the adhesiveness of the adhesive is sufficiently low to allow the opening of the adhesive zones and consequently an establishing of the adhesive connection, the adhesive possesses, however, a specific cohesiveness of such a magnitude that the adhesive connection is able to transfer these forces when the total area of the adhesive zones for instance corresponds to 0.5-10%, preferably 1.5-7.5%, of the inner surface area of the outer sack.
  • the inner sack is of a very thin flexible material and can often be crumpled or twisted when it is inserted into the outer sack. If in this state it adheres at some locations to the outer sack, it cannot expand to its complete volume, and a risk of the inner sack bursting arises when said sack thus cannot abut the outer sack everywhere and when the wall of the inner sack is not sufficiently load bearing per se to bear the weight of the bulk goods.
  • the total area of the adhesive-zones only corresponds to 0.5-10%, preferably 1.5-7.5%, of the inner area ot the outer sack, and as the achesive zones arc not separated until the inner sack has expanded to such an extent that the portions of the oppcosing sides of the sacks free of adhesive abut one another, the expansion of the inner sack has reached such an extent that substantially all the crumbles and twistings are straightened before any adhesive connection is established.
  • the adhesive folds are provided by folding the walls of the sacks. As illustrated in Figures 2, 3, and 4, the adhesive folds 4 project outwards from the outer side of the outer sack, and as illustrated in Figure 5, the adhesive folds 7, 8 project inwards from the inner side of the inner sack in such a manner that the adhesive applied within the adhesive folds are positioned on the opposing sides of the sacks at the above separation, said opposing sides of the sacks about to being interadhered.
  • Figures 3 and 4 illustrate an embodiment of the outer sack, where the adhesive folds are positioned at preferably vertically extending side seams 6 interconnecting the side members of the sack, the seam 6 forming the back of the adhesive fold.
  • This seam can be provided by sewing, welding or adhesion.
  • the seam of the container of Figures 3 and 4 is shaped by sewing through the twice folded material simultaneously forming a bracing of the corners of the container. During the filling and emptying procedure the forces are therefore transferred from the inner sack to the outer sack where the latter is strongest.
  • the adhesive 5 is positioned at such a distance from the machinery and the tools producing the seam, that said machinery and tools do not touch the adhesive during the sewing.
  • This embodiment is particularly inexpensive as the adhesive folds are formed together-with the working process nevertheless having to be carried out for joining the side members of the outer sack.
  • Figure 6 illustrates an embodiment of the inner sack comprising two inward adhesive folds 8.
  • these adhesive folds are preferably positioned opposite one another in such a manner that the sack takes up as little room as possible during the storing, folding, and rolling up.
  • This embodiment is particularly suited when the inner sack is not inserted into the outer sack in direct connection with the manufacturing process but not until later.
  • Figure 7 illustrates an embodiment, where one pair of corresponding adhesive zones is formed by a separate detachable cover strip 9 of for instance cover film.
  • pairs of connected adhesive zones can be provided on the locations of the sacks where it is difficult to fold the wall material for instance at the transition between the side members and the bottom.
  • Figure 5 illustrates an embodiment of the container where both the inner sack and the outer sack comprises four adhesive folds displaced 45° relative to one another.
  • the distance between the adhesive connections corresponds thereby to half the distance between the adhesive folds on each sack.
  • the total strength of the adhesive connection depends in connection with this embodiment on the adhesive properties of the adhesive on both sacks. When an adhesive with different characteristics for the adhesive on both sacks is used, a double certainty is thus obtained for the total adhesive connection being durable during the filling and emptying of the container.
  • the above embodiments according to the invention may be used for flexible containers of any size.
  • the inner sack is of such a size compared to the outer sack that its respective surface zones are of extents at least equally great as the areas of the opposing surface zones on the outer sack.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
EP85104429A 1984-04-12 1985-04-11 Flexibler Behälter zum Transport und Lagern von Schüttgut Withdrawn EP0158361A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK190684A DK150453C (da) 1984-04-12 1984-04-12 Fleksibel beholder til transport og opbevaring af massegods
DK1906/84 1984-04-12

Publications (2)

Publication Number Publication Date
EP0158361A2 true EP0158361A2 (de) 1985-10-16
EP0158361A3 EP0158361A3 (de) 1987-01-14

Family

ID=8108919

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85104429A Withdrawn EP0158361A3 (de) 1984-04-12 1985-04-11 Flexibler Behälter zum Transport und Lagern von Schüttgut

Country Status (2)

Country Link
EP (1) EP0158361A3 (de)
DK (1) DK150453C (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207120A (en) * 1987-07-16 1989-01-25 Bowater Packaging Ltd Container assembly
EP0306253A1 (de) * 1987-08-31 1989-03-08 Norsk Hydro A/S Flexibler Container mit Schlaufen zum Anheben
US4946291A (en) * 1987-01-02 1990-08-07 Schnaars Daniel R Semi-bulk with liner
US4997502A (en) * 1989-12-12 1991-03-05 Schnaars Daniel R Process and apparatus for applying an adhesive to the interior surface of a bulk bag and gluing a plastic liner within the bag
WO1996016882A1 (en) * 1994-12-02 1996-06-06 Upm-Kymmene Oy Method for fixing the inner sack of a unit-load sack to the outer sack
US6718590B1 (en) * 1993-06-18 2004-04-13 James W. Jimison Method and apparatus for cleaning and polishing fruits and vegetables
EP2218656A1 (de) * 2009-02-14 2010-08-18 Nordenia Deutschland Emsdetten GmbH Flexibler Schüttgutbehälter
US9405992B2 (en) 2011-04-01 2016-08-02 Envac Optibag Ab Method and system for identifying waste containers based on pattern

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2417109A1 (de) * 1974-04-08 1975-10-23 Bennigsen Mackiewicz A Von Aus flexiblem material bestehender tank fuer schuettgueter
SE412055B (sv) * 1978-07-11 1980-02-18 Supra Ab Forpackning

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4946291A (en) * 1987-01-02 1990-08-07 Schnaars Daniel R Semi-bulk with liner
USRE34560E (en) * 1987-01-02 1994-03-08 Flexcon & Systems, Inc. Semi-bulk with liner
GB2207120A (en) * 1987-07-16 1989-01-25 Bowater Packaging Ltd Container assembly
EP0306253A1 (de) * 1987-08-31 1989-03-08 Norsk Hydro A/S Flexibler Container mit Schlaufen zum Anheben
US4997502A (en) * 1989-12-12 1991-03-05 Schnaars Daniel R Process and apparatus for applying an adhesive to the interior surface of a bulk bag and gluing a plastic liner within the bag
US6718590B1 (en) * 1993-06-18 2004-04-13 James W. Jimison Method and apparatus for cleaning and polishing fruits and vegetables
WO1996016882A1 (en) * 1994-12-02 1996-06-06 Upm-Kymmene Oy Method for fixing the inner sack of a unit-load sack to the outer sack
EP2218656A1 (de) * 2009-02-14 2010-08-18 Nordenia Deutschland Emsdetten GmbH Flexibler Schüttgutbehälter
US9405992B2 (en) 2011-04-01 2016-08-02 Envac Optibag Ab Method and system for identifying waste containers based on pattern

Also Published As

Publication number Publication date
EP0158361A3 (de) 1987-01-14
DK150453B (da) 1987-03-02
DK190684D0 (da) 1984-04-12
DK150453C (da) 1987-12-14
DK190684A (da) 1985-10-13

Similar Documents

Publication Publication Date Title
US4391366A (en) Foldable cup
US6371646B1 (en) Bulk bag with multiple ply walls and a method of forming it from tubular blanks
US5865541A (en) Bulk container liner and method
US6695476B2 (en) Bag with extensible handles
US4478351A (en) Compound packing container
RU2282571C2 (ru) Контейнер для хранения продуктов и способ его изготовления
US2341056A (en) Container and method
US6032818A (en) Liner
US5219220A (en) Four-film diagonal gusset seals for bags
US5087235A (en) Method for making a collapsible bag with spout
MXPA02006284A (es) Bolsa de hielo con abertura expandible.
JPH0343345A (ja) 立方形ゲーブルパッケージ
JP2002347788A (ja) 側面蛇腹付き袋
EP0158361A2 (de) Flexibler Behälter zum Transport und Lagern von Schüttgut
HU215024B (hu) Hajlékony konténer, főleg ömlesztett anyagokhoz
US2435743A (en) Waterproof bag
US3285498A (en) Leakproof bottom closure for single wall bag
US4564107A (en) Container for the pressure tight packaging of articles, in particular tennis balls
JPS5974084A (ja) 折りたたみ可能な袋
EP0141429B1 (de) Verfahren und Vorrichtung für die Herstellung von flachen, flexiblen Behältern mit Einlage
US20060035777A1 (en) Self-closing sealable valve bag
EP0907571A4 (de) Selbstschliessender, siegelfähiger ventilsack
GB2218401A (en) Improvements in or relating to packages
EP1053183B2 (de) Ventilsack
US4171764A (en) Can lining bag of flexible plastic film

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

Designated state(s): DE GB IT NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE GB IT NL SE

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: 19870715

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LARSEN, KURT