EP1054808B1 - A method for the manufacture of a filling and emptying opening for a liquid packing container - Google Patents

A method for the manufacture of a filling and emptying opening for a liquid packing container Download PDF

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Publication number
EP1054808B1
EP1054808B1 EP98949018A EP98949018A EP1054808B1 EP 1054808 B1 EP1054808 B1 EP 1054808B1 EP 98949018 A EP98949018 A EP 98949018A EP 98949018 A EP98949018 A EP 98949018A EP 1054808 B1 EP1054808 B1 EP 1054808B1
Authority
EP
European Patent Office
Prior art keywords
hole
layer
thermoplastic
laminate
basic laminate
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 - Lifetime
Application number
EP98949018A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1054808A1 (en
Inventor
Hannu Kyykoski
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.)
UPM Kymmene Oy
Original Assignee
UPM Kymmene Oy
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 UPM Kymmene Oy filed Critical UPM Kymmene Oy
Publication of EP1054808A1 publication Critical patent/EP1054808A1/en
Application granted granted Critical
Publication of EP1054808B1 publication Critical patent/EP1054808B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/70—Break-in flaps, or members adapted to be torn-off, to provide pouring openings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
    • B65B61/18—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for making package-opening or unpacking elements
    • B65B61/186—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for making package-opening or unpacking elements by applying or incorporating rigid fittings, e.g. discharge spouts

Definitions

  • the invention relates to a method of making a fill and/or drain opening to a packaging container intended for liquid material, which packaging container either partially or entirely is made of a packaging laminate comprising layers of fibre-based material and thermoplastic, and which opening is later equipped with a detachable pull tab, in which method a hole of predetermined size and shape is formed on a basic laminate comprising at least one support layer of fibre-based material and at least one first thermoplastic layer, the hole in the basic laminate and the edges of the hole are covered on the side of the basic laminate comprising at least one first thermoplastic layer with at least one second thermoplastic layer, the surface of the basic laminate opposite to the at least one first thermoplastic layer is laminated with at least one third thermoplastic layer, at least the second and the third thermoplastic layers attached to opposite sides of the hole in the basic laminate are joined together at the area of the hole with the help of heat and pressure, and a fill and/or drain opening is formed centrally with respect to the hole in the basic laminate so that the opening is smaller than the hole in the basic laminate whereupon at
  • EP-A-0 686 567 discloses the features in the preamble of claim 1.
  • Disposable liquid packaging containers are nowadays used more and more in the packaging of liquid food stuffs, such as milk, juice and wine.
  • these packaging containers are made of a prefabricated laminated packaging material comprising a support layer of liquid packaging board which is covered on at least one side and typically on both sides with thin liquid- and gas-tight thermoplastic layers, for example polyethylene layers.
  • Liquid packaging containers are usually also equipped with an opening device of some type, for example a tear-off or cutoff indication or a detachable pull tab which is attached liquid- and gas-tightly on top of the drain opening.
  • an opening device of some type for example a tear-off or cutoff indication or a detachable pull tab which is attached liquid- and gas-tightly on top of the drain opening.
  • Typical examples of liquid packaging containers equipped with opening devices of this type are disclosed, for example, in the US-A-5 653 383 and SE publication 441 666.
  • An opening device which comprises a drain opening preperforated through the material and a detachable pull tab attached on top of the opening liquid- and gas-tightly, has several advantages since it is easy to use, it can be attached to the packaging material beforehand and it is inexpensive in costs. However, in the packaging of liquid filling materials, special attention should be paid to an efficient isolation of the untreated edge of the packaging laminate exposed in the perforation from the filling agent, since otherwise the filling agent is absorbed to the fibrous support layer impairing the tightness, strength and appearance of the laminate.
  • a drain opening is also equipped with an internal thermoplastic layer which is placed on the side of the packaging laminate in contact with the filling agent and which covers both the drain opening and the area surrounding the opening.
  • the cover layer is then attached to the pull tab through the drain opening so that the cover layer is torn when the pull tab is removed enabling the discharge of the filling agent through the drain opening.
  • the previously closed untreated edge of the laminate becomes exposed again and filling agent is absorbed to the fibrous support layer during the discharge procedure. This is not desirable for hygienic and esthetic reasons.
  • aseptic containers In the packaging of sterile filling agents such as sterile milk and sterile juice, aseptic containers are used the structures of which are mainly similar to what is described above.
  • the packaging laminate nevertheless comprises one or several additional layers to improve gas-tightness. Aluminium foil and thermoplastic, for example polyethylene, are usually used as a gas barrier. Then it becomes particularly important to avoid contact between the filling agent and metal, not only during storage in a closed container but also during the discharge phase and when storing the remaining filling agent in the opened container. This concerns especially acidic filling agents, such as juice and wine, because a contact between these filling agents and metal causes a chemical change which affects the taste of the product.
  • opening arrangements are known which at least in principle would be suitable for use as fill openings as well, since in them the pull tab is located only on the external surface of the packaging container.
  • the solutions described nevertheless involve certain problems related both to the opening arrangement itself and the general structure of the packaging material.
  • both the closing of the untreated edge and the closing flap itself are realised with the help of separate flaps fitted only at the area of the hole in the basic laminate, the opening when closed is formed so much thicker than the rest of the packaging laminate that the rolls used in the storage of packaging material are no longer usable.
  • the closing of the untreated edge with a separate flap means that the packaging laminate through which a hole for the manufacture of the drain opening is perforated must already as such meet the requirements set in relation to gas- and liquid-tightness at least as far as the outer surface of the container is concerned, since the flap in question does not contribute to the meeting of these requirements.
  • a flap used in the closing of the untreated edge also has to be separately aligned in relation to the hole in the packaging laminate and attached to the edges of the hole, which makes the manufacture also in this part a complex process demanding precision.
  • thermoplastic layer already in the basic laminate and the thermoplastic layer laminated on top of it and used in the closing of the untreated edge can be optimized in relation to properties.
  • thermoplastic layer already in the basic laminate can be selected as such that it has optimal adherence to the basic layer of fibre-based material even at the expense of other properties such as gas- and liquid-tightness. These properties can then be taken care of with the help of a thermoplastic layer used in the closing of the untreated edge.
  • a thermoplastic layer used in the closing of the untreated edge It is known that foils with the best barrier properties adhere best to thermoplastic layers and not so much to layers of fibre-based material such as board.
  • the foil used in the closing of the untreated edge can now be selected better also in relation to the properties important in view of closing the untreated edge of the fibre layer as gas- and liquid-tightly as possible.
  • the layer used in the closing of the untreated edge can be laminated in an entirely conventional manner since it is now intended to cover the entire basic laminate and no special solutions are required to align it in relation to the hole in the basic laminate.
  • the third thermoplastic layer to be laminated on the surface of the basic laminate opposite to the first thermoplastic layer forming a part of the basic laminate is extruded as a barrier multi layer foil comprising ethylene alpha olefin.
  • a barrier multi layer foil comprising ethylene alpha olefin.
  • at least one layer of the barrier multi layer foil settling against the support layer of fibre-based material comprises over 50%, such as 80% ethylene alpha olefin. This way an optimal adherence to the support layer of fibre-based material is achieved and also good barrier properties so that the thermoplastic creating the barrier properties is not the outermost layer.
  • the first thermoplastic layer forming a part of the basic laminate can comprise ethylene alpha olefin.
  • thermoplastic layer to be laminated on top of the first thermoplastic layer forming a part of the basic laminate is extruded as a barrier multi layer foil.
  • thermoplastic layer participating in the closing of the untreated edge can be optimised also in relation to a procedure where a fill and/or drain opening is formed by bringing the thermoplastic layers covering the hole in the basic laminate to purse up to the edges of the hole and by treating them so that they are shaped and will close gas- and liquid-tightly the untreated edge of the hole in the basic laminate between them.
  • a fill and/or drain opening is formed by bringing the thermoplastic layers covering the hole in the basic laminate to purse up to the edges of the hole and by treating them so that they are shaped and will close gas- and liquid-tightly the untreated edge of the hole in the basic laminate between them.
  • the pursing up can be encouraged by blowing hot air to the centre of the hole in the basic laminate.
  • the opening is formed by punching and that the remaining parts of at least the second and third thermoplastic layers joined together and bordering the formed opening are heated to a plasticizing temperature and treated so that they are shaped and will close gas- and liquid-tightly the untreated edge of the hole in the basic laminate between them.
  • the closing of the opening is carried out with a detachable pull tab attached from the outside and therefore the opening can preferably be used both as a fill opening and as a drain opening.
  • a packaging laminate 1 is shown, through the layer 3 of fibre-based material and the first thermoplastic layer 4 laminated on top of it forming the basic laminate 2 of said packaging laminate a hole is opened, the untreated edge of the basic laminate bordering the hole being marked with a reference number 5.
  • the basic laminate 2 is covered on opposite sides with a second and a third thermoplastic layer 6 and 7, the latter of which is thus located on top of the first thermoplastic layer 4.
  • the layers 6 and 7 are joined together at the area of the hole with the help of heat and pressure. After this the forming of the actual fill and/or drain opening follows.
  • the opening is formed preferably between the broken lines 8 in the figure by bringing the thermoplastic layers 6 and 7 covering the hole in the basic laminate 2 to purse up to the edges of the hole and by treating them so that they are shaped and will close gas- and liquid-tightly the untreated edge 5 of the hole in the basic laminate between them.
  • the pursing up can be effected by different types of known heating methods. It can also be effected or it can be otherwise encouraged by blowing hot air to the centre of the hole in the basic laminate.
  • the opening between the broken lines 8 can be opened also by punching but in that case not all of the plastic at the area of the hole can be used in the closing of the untreated edge, as in the method described earlier.
  • the third thermoplastic layer 6 to be laminated on the surface of the basic laminate opposite to the first thermoplastic layer 4 forming a part of the basic laminate 2 is extruded as a barrier multi layer foil comprising ethylene alpha olefin, such as the Dow Chemical Company's AFFINITY ® PT 1450 polyolefin plastomer.
  • This multi layer foil can comprise, for example, five layers extruded simultaneously with the same extruder. Then for example two of the layers settling against the support layer 3 of fibre-based material can comprise over 50%, such as 80%, of said polyolefin plastomer, the rest being LDPE.
  • the rest of the layers of the barrier multi layer foil in question can be for example LDPE. This way an optimal adherence to the support layer of fibre-based material is achieved and also good barrier properties so that the thermoplastic creating the barrier properties is not the outermost layer to be in contact with the product to be packaged.
  • the first thermoplastic layer 4 forming a part of the basic laminate can comprise a suitable barrier plastic, such as ethylene alpha olefin mentioned above.
  • thermoplastic layer 7 to be laminated on top of the first thermoplastic layer 4 forming a part of the basic laminate is extruded as a barrier multi layer foil in the same way as described above with respect to layer 6.
  • the basic laminate used can contain before perforation also more than one thermoplastic layers or also for example a barrier layer of aluminium.
  • the number and nature of the layers included in the basic laminate is defined primarily on the basis of the intended use of the packaging container.
  • the nature and number of the layers to be laminated on top of the basic laminate and thus participating in the closing of the untreated edge of the hole is defined primarily on the basis of the desired properties of the packaging container in each case.
  • the layer composition of a ready-made packaging laminate is naturally optimized so that it meets the desired requirements with respect to both the packaging laminate itself and the closing of the untreated edge of the hole made in the basic laminate.
  • the layers essential for the closing of the untreated edge are utilized optimally also in other parts of the packaging laminate whereupon extra thermoplastic layers unnecessary with respect to each intended use can be avoided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)
  • Making Paper Articles (AREA)
EP98949018A 1997-10-22 1998-10-19 A method for the manufacture of a filling and emptying opening for a liquid packing container Expired - Lifetime EP1054808B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI974024 1997-10-22
FI974024A FI104811B (fi) 1997-10-22 1997-10-22 Menetelmä nestepakkauksen täyttö- ja/tai tyhjennysaukon valmistamiseksi
PCT/FI1998/000810 WO1999020531A1 (fi) 1997-10-22 1998-10-19 A method for the manufacture of a filling and emptying opening for a liquid packing container

Publications (2)

Publication Number Publication Date
EP1054808A1 EP1054808A1 (en) 2000-11-29
EP1054808B1 true EP1054808B1 (en) 2004-04-14

Family

ID=8549776

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98949018A Expired - Lifetime EP1054808B1 (en) 1997-10-22 1998-10-19 A method for the manufacture of a filling and emptying opening for a liquid packing container

Country Status (4)

Country Link
EP (1) EP1054808B1 (fi)
DE (1) DE69823234T2 (fi)
FI (1) FI104811B (fi)
WO (1) WO1999020531A1 (fi)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE525978C2 (sv) 2000-05-08 2005-06-07 Tetra Laval Holdings & Finance Sätt att framställa förpackningslaminat samt förpackningsbehållare därav med genomgående hål och öppningsanordning
FI110088B (fi) * 2001-01-16 2002-11-29 Upm Kymmene Corp Menetelmä nestepakkauksen tyhjennysaukon valmistamiseksi
SE522498C2 (sv) 2002-05-07 2004-02-10 Tetra Laval Holdings & Finance Förpackningslaminat, förfarande för tillverkning av detta, samt förpackningsbehållare tillverkad av förpackningslaminatet
SE523861C2 (sv) * 2002-05-07 2004-05-25 Tetra Laval Holdings & Finance Förpackningslaminat, förfarande för tillverkning av detta, samt förpackningsbehållare tillverkad av förpackningslaminatet
DE10326106A1 (de) * 2003-06-06 2004-12-30 Sig Technology Ltd. Verfahren und Vorrichtung zum Herstellen von Packungsmänteln für Karton/Kunststoff-Verbundpackungen
CN104443773B (zh) * 2014-10-09 2017-04-05 海宁长林包装材料有限公司 一种包装膜的生产设备

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE412204B (sv) * 1978-05-02 1980-02-25 Tetra Pak Int Sett och anordning for att forsegla en teckremsa over en forpackningsoppning
SE439452B (sv) * 1983-12-15 1985-06-17 Tetra Pak Int Sett att forsegla en tomningsoppning samt anordning for genomforande av settet
SE441666B (sv) * 1984-03-21 1985-10-28 Tetra Pak Int Oppningsanordning vid forpackningsbehallare samt sett att tillverka densamma
SE453586B (sv) * 1986-03-26 1988-02-15 Tetra Pak Ab Forpackningsbehallare forsedd med aterforslutbar oppningsanordning
GB2209327A (en) * 1986-11-13 1989-05-10 Hans Rausing A packing container for liquid contents
SE9200999L (sv) * 1992-03-31 1993-10-01 Tetra Laval Holdings & Finance Förpackningsmaterial med öppningsanordning samt sätt att framställa detsamma
AU2044195A (en) * 1994-06-10 1995-12-21 Tetra Laval Holdings & Finance Sa Container of laminated material with opening and method for manufacturing the container
FI954102A (fi) * 1994-11-17 1996-05-18 Toppan Printing Co Ltd Kartonkirasian kaatonokka, kaatonokalla varustettu kartonkirasia ja menetelmä kaatonokan valmistamiseksi

Also Published As

Publication number Publication date
FI974024A (fi) 1999-04-23
EP1054808A1 (en) 2000-11-29
FI104811B (fi) 2000-04-14
DE69823234D1 (de) 2004-05-19
FI974024A0 (fi) 1997-10-22
DE69823234T2 (de) 2005-04-28
WO1999020531A1 (fi) 1999-04-29

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