EP0000374B1 - Verfahren zum Herstellen eines Verpackungslaminates und nach diesem hergestelltes Verpackungslaminat - Google Patents

Verfahren zum Herstellen eines Verpackungslaminates und nach diesem hergestelltes Verpackungslaminat Download PDF

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Publication number
EP0000374B1
EP0000374B1 EP78100315A EP78100315A EP0000374B1 EP 0000374 B1 EP0000374 B1 EP 0000374B1 EP 78100315 A EP78100315 A EP 78100315A EP 78100315 A EP78100315 A EP 78100315A EP 0000374 B1 EP0000374 B1 EP 0000374B1
Authority
EP
European Patent Office
Prior art keywords
laminate
packing
carrier layer
folding
layer
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
EP78100315A
Other languages
English (en)
French (fr)
Other versions
EP0000374A1 (de
Inventor
Jan Axel Ingemar Rausér
Renato Cetrelli
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.)
Tetra Pak AB
Original Assignee
Tetra Pak AB
Tetra Pak International AB
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 Tetra Pak AB, Tetra Pak International AB filed Critical Tetra Pak AB
Publication of EP0000374A1 publication Critical patent/EP0000374A1/de
Application granted granted Critical
Publication of EP0000374B1 publication Critical patent/EP0000374B1/de
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
    • 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
    • B65D5/4266—Folding lines, score lines, crease lines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S229/00—Envelopes, wrappers, and paperboard boxes
    • Y10S229/92—Stress relief
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S229/00—Envelopes, wrappers, and paperboard boxes
    • Y10S229/93—Fold detail
    • Y10S229/931—Fold includes slit or aperture

Definitions

  • the present invention relates to a method of manufacturing a packing laminate, with the purpose of preventing crack formation when the laminate is folded, including cutting through a carrier layer of the laminate, prior to the application of at least one outer layer to the laminate, in an area to be subjected to subsequent folding, so as to avoid rupture of the outer layer of the laminate when folding takes place.
  • the invention also relates to a laminated material manufactured according to the method comprising a carrier layer and at least one homogeneous plastic layer covering the carrier layer as an outer layer.
  • Such method and packing laminate is known (GB A 973 801).
  • the carrier layer thereof comprises slits in order to weaken the material and to enable it to be bent inwardly, and also to protect an inner layer of the laminate against rupture.
  • Packing containers of the one-way type are frequently manufactured in that a material in the shape of a web or sheet is converted by folding and sealing to a packing container of the desired shape.
  • a laminated material may be used which comprises different material layers which give the combined laminate the desired properties when rigidity, strength and imperviousness to liquids are needed.
  • a frequently used packing laminate comprises a centrally located, relatively thick carrier layer of fibrous material, which layer is covered on either side with homogeneous plastic layers.
  • the plastic layers are formed of thermoplastic material, which makes possible a simple sealing of the material by heating and pressing together of the plastic layers of the two parts of material which are to be joined together.
  • the laminate often comprises further layers, e.g. a layer of aluminium foil located between the carrier layer and one of the thermoplastic layers which in the finished packing container very effectively protects the packed contents from the effect of light.
  • the laminated material is subjected to great stresses. This is especially the case on folding of the material, since a folding of the material owing to the relatively great rigidity of the carrier layer means that one of the thermoplastic layers is subjected to a strong stretching, whilst the opposite thermoplastic layer is compressed along the whole folding line. Owing to the great extensibility of the thermoplastic layer, however, this only rarely leads to the thermoplastics being damaged or losing its imperviousness to liquids. The situation is aggravated, however, if the packing laminate also comprises an aluminium foil, which, compared with the thermoplastic layer, possesses low extensibility and consequently tends to crack when the laminate is folded.
  • the sealing fin so that it should not form an obstacle, is often folded down against the outside of the packing container, which means that the one laminate sheet experiences a 180° folding and that the packing container wall in the actual sealing area consists of three laminate sheets, i.e. has threefold thickness.
  • a seal of the aforementioned type often runs along one or more of the side faces of the packing container, and since these side faces, e.g. during the forming of parallelepipedic packages from cushionlike packages, are subjected to a folding about 180° along a folding line which runs at an angle of 90° to the seal (described in more details in the following), the material thickness will in certain limited areas of the packing container go up to 6 times the laminate thickness.
  • this folding about 180° transversely to the sealing region the material sheet which after the folding is located on the outside of the fold (that is to say, the material sheets located outside the neutral plane created) will be subjected to very strong tensile stress with accompanying stretching and crack formation. These tensile stresses are so great that not only any aluminium layer that may have been incorporated in the laminate, but also the thermoplastic layer, cracks with consequent leakages occurring.
  • the cut should preferably be circular.
  • a further preferred embodiment of the method in accordance with the invention has been given moreover the characteristic that the cut is made in the carrier layer of the laminate sheet which after folding and forming of the packing container is located on the outside of the fold.
  • the invention also relates to a packing laminate manufactured according to the above described method, which in accordance with the invention is given the characteristic that the carrier layer at the places where the packing laminate has converging or crossing folding lines, is removed in the meeting point of the folding lines.
  • the packing laminate shown on the drawings is of the known type and comprises a relatively thick central carrier layer of e.g. paper, which layer gives the material the desired rigidity.
  • the carrier layer has been provided on both sides with thin layers of a homogeneous plastic layer, which is preferably of the thermoplastic type.
  • the packing laminate may also comprise further layers with different objectives, e.g. an aluminium layer impervious to light which prevents daylight from reaching and acting upon the contents. Further layers with special purposes are also conceivable. Since the type of laminate described is well known to those versed in the art, the different layers have not been marked in the laminate shown on the drawings, but for the sake of greater clarity the same has instead been shown as consisting of a single layer.
  • FIG 1 a portion of a packing container wall 1 with a seal of the type material-inside to material-inside.
  • This seal is achieved in that the thermoplastic layers of the material facing towards the inside of the packing container are heated up along the edge regions which are to be combined, whereupon the layers are pressed against one another so that a seal is achieved with formation of a sealing fin 2 situated outside the package.
  • the packing container is given in the sealing region threefold wall thickness and comprises more particularly an inner material sheet 3 which constitutes the actual packing material wall in the sealing region, together with two material sheets 4 and 5 forming the sealing fin 2.
  • the material sheet 4 constitutes a part of the material sheet 3 folded over about 180°
  • the material sheet 5 constitutes a continuation of the outer one of the two wall portions sealed together in the sealing fin.
  • the material sheet 5 situated inside the neutral plane will be pressed together at the place of folding and compressed whilst the two material sheets 3 and 4 situated outside the neutral plane will be subjected to tensile stresses, which are considerably higher in the material sheet 3 which is located outermost.
  • These tensile stresses give rise to crack formation in the carrier layer of the material sheet 3, which. is indicated by reference numeral 7, and frequently also to crack formation in the carrier layer of the material sheet 4 located inside.
  • This crack formation is of minor importance. Owing to the large tensile stresses in the material sheet 3 located outermost, though, crack formation frequently occurs also in the thermoplastic material layer of this laminate or sheet, which has a detrimental effect on the imperviousness of the packing container.
  • the packing container laminate is of the type which comprises layers of aluminium foil, the double folding of the laminate described unfailingly gives rise to crack formation in the aluminium foil, which crack formation frequently occurs in the two outer material sheets 3 and 4.
  • thermoplastic layer in the two material sheets 3 and 4 after the removal of the carrier layer in the said material sheets, can now follow in the actual place of the folding a line which in the actual folding almost coincides with the neutral plane, which means that the thermoplastic layers (and also any aluminium layers present) are practically fully relieved of tensile stresses, so that the imperviousness of the packing material and the capacity to exclude light are retained.
  • This limited area 8 wherein the carrier layer of the material has been removed, is located just at the point of intersection between the two 180° foldings, which means that the weakening caused in the material will be wholly unimportant and negligible.
  • the tensile stresses on the outer material sheets are reduced instead in that the carrier layer is cut through in the area 8 (fig. 3) in the material sheet 5 which is located inside the neutral plane (fig. 6).
  • this material sheet 5 which now only consists of the thermoplastic layers and possibly aluminium foils, will be pressed together more easily and "give way” at the folding, which means that the outer laminate sheets 3, 4 also in this embodiment of the invention, can follow a line which more or less coincides with the neutral plane and quite simply "permits a shorter travel" around the folding line.
  • This method gives the same effect as the embodiment described earlier, but is to be preferred in certain cases, since the measure will be completely invisible on the finished packing container.
  • the removal of one or more carrier layers from the laminate sheet within the said area takes place already during the manufacture of the laminated material, that is to say before the carrier layer is provided with the two thermoplastic layers and possibly any aluminium layers.
  • the carrier layer is preferably removed by punching out the excess material, so that a hole results which simply and with great accuracy can be placed in the right position, since the creases or folding lines along which the material is to be folded during the forming of the packing container clearly mark the place at which the folding lines will cross one another in the finished packing container.
  • a packing laminate manufactured in accordance with the method of the invention comprises a carrier layer together with at least one homogeneous plastic layer covering the carrier layer and possibly also further layers e.g. aluminium foil.
  • the packing laminate may be of an arbitrary, known shape, but is provided with perforated portions of the carrier layer at the places where the packing laminate has converging or crossing folding lines.
  • the carrier layer at the place where the packing laminate has converging or crossing folding lines is removed at the meeting point of the folding lines.
  • a method and a packing laminate are provided wherein the problems existing up to now in foldings about 180° crossing or converging with one another have been effectively eliminated.
  • the method is simple, inexpensive and allows economies, since the material quality can be lowered and adapted to the appreciably smaller stresses which arise in the remaining part of the surface of the packing container.

Claims (4)

1. Verfahren zur Herstellung eines Verpackungslaminats mit verminderter Rissebildungsgefahr beim Falten, bei dem vor dem Anbringen mindestens einer Außenschicht am Laminat dessen Trägerschicht in einem Bereich durchtrennt wird, der nachfolgenden Faltvorgängen ausgesetzt ist, um das Einreißen der Außenschicht(en) des Laminats beim Falten zu vermeiden, dadurch gekennzeichnet, daß de Trägerschicht rings um den Bereich (8) durchtrennt bzw. durchschnitten wird, an dem Faltlinien konvergieren bzw. einander kreuzen, und daß daraufhin das Material der Trägerschicht des abgetrennten bzw. ausgeschnitten Bereichs entfernt wird.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Durchtrennung bzw. der Schnitt kreisförmig ausgebildet wird.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Durchtrennung bzw. der Schnitt in der Trägerschicht der Laminatschicht ausgeführt wird, die nach dem Falten und Formen eines Packungsbehälters sich an der Außenseite der Faltung befindet.
4. Verpackungslaminat, das eine Trägerschicht und mindestens eine homogene Kunststoffschicht aufweist, die die Trägerschicht bedeckt, bei dem die Trägerschicht an denjenigen Stellen, an denen das Verpackungslaminat konvergierende oder sich kreuzende Faltlinien aufweist, mit perforierten bzw. geschwächten Stellen versehen ist, dadurch gekennzeichnet, daß die Trägerschicht an denjenigen Stellen, an denen das Verpackungslaminat konvergierende oder sich kreuzende Faltlinien aufweis, im Treffpunkt der Faltlinien entfernt ist.
EP78100315A 1977-07-11 1978-07-06 Verfahren zum Herstellen eines Verpackungslaminates und nach diesem hergestelltes Verpackungslaminat Expired EP0000374B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7708027A SE7708027L (sv) 1977-07-11 1977-07-11 Sett att utforma ett forpackningslaminat samt enligt settet tillverkat forpackningslaminat
SE7708027 1977-07-11

Publications (2)

Publication Number Publication Date
EP0000374A1 EP0000374A1 (de) 1979-01-24
EP0000374B1 true EP0000374B1 (de) 1981-07-08

Family

ID=20331842

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78100315A Expired EP0000374B1 (de) 1977-07-11 1978-07-06 Verfahren zum Herstellen eines Verpackungslaminates und nach diesem hergestelltes Verpackungslaminat

Country Status (8)

Country Link
US (1) US4511078A (de)
EP (1) EP0000374B1 (de)
AU (1) AU523844B2 (de)
CA (1) CA1119942A (de)
DE (1) DE2860818D1 (de)
IT (1) IT1096930B (de)
SE (1) SE7708027L (de)
SU (1) SU1037833A3 (de)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE432918B (sv) * 1979-10-18 1984-04-30 Tetra Pak Int Biglinjeforsett forpackningslaminat
IE55389B1 (en) * 1983-08-04 1990-08-29 Marshall Cavandish Services Li Improvements in or relating to containers and methods of,and apparatus for,manufacturing containers
US4623072A (en) * 1985-04-18 1986-11-18 Macmillan Bloedel Limited Corrugated container with foldable flaps
JPS6295520U (de) * 1985-12-06 1987-06-18
EP0640461A1 (de) * 1988-08-01 1995-03-01 Tetra Laval Holdings & Finance SA Verfahren zur Herstellung eines flexibelen Verpackungsmaterials mit Nuten
US5223194A (en) * 1988-08-01 1993-06-29 Tetra Alfa Holdings S.A. Flexible packing material in sheet or web form
SE467403B (sv) * 1990-11-07 1992-07-13 Tetra Alfa Holdings Foerpackningsmaterial med goda gasbarriaeregenskaper samt av materialet framstaelld foerpackningsbehaallare
US5944252A (en) * 1997-03-18 1999-08-31 Connelly Containers, Inc. Corrugated board container and method of making the same
SE513254C2 (sv) 1997-11-13 2000-08-07 Tetra Laval Holdings & Finance Sätt att tillverka kantförseglade förpackningsbehållarämnen
ATE264792T1 (de) * 1998-02-13 2004-05-15 Tetra Laval Holdings & Finance Vorgekerbtes blattmaterial zum verpacken flüssiger nahrungsmittel und aus diesem hergestellte verpackungen
US6085970A (en) * 1998-11-30 2000-07-11 Insulair, Inc. Insulated cup and method of manufacture
BRPI0510164A (pt) * 2004-04-22 2007-10-02 Insulair Inc envoltório de copo isolante e recipiente isolado formado com o envoltório
US7767049B2 (en) * 2006-10-12 2010-08-03 Dixie Consumer Products Llc Multi-layered container having interrupted corrugated insulating liner
CN102414012A (zh) 2009-04-23 2012-04-11 帝斯曼知识产权资产管理有限公司 压缩板材

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1299824A (en) * 1919-04-08 American Can Co Container-body.
US2291542A (en) * 1939-12-23 1942-07-28 Eagle Pencil Co Box wrapper
GB559274A (en) * 1942-10-11 1944-02-11 Herbert Maclean Ware Improvements in or relating to sealable bottles and like containers composed of paper, wood-pulp or other like material
US2634046A (en) * 1950-08-10 1953-04-07 Morris M Weber Cardboard box structure
US3032251A (en) * 1959-01-08 1962-05-01 Hermorion Ltd Laminate sheet material and package produced therefrom
NL257987A (de) * 1959-11-16
US3067923A (en) * 1960-11-15 1962-12-11 Minnesota Mining & Mfg Carton
FR85710E (fr) * 1964-02-14 1965-10-01 Anciens Etablissements Walton Procédé de fabrication d'emballages en carton ondulé résistant à l'humidité, en particulier de plateaux à fruits ou à légumes

Also Published As

Publication number Publication date
DE2860818D1 (en) 1981-10-15
AU3790078A (en) 1980-01-17
AU523844B2 (en) 1982-08-19
SU1037833A3 (ru) 1983-08-23
IT1096930B (it) 1985-08-26
IT7825455A0 (it) 1978-07-07
CA1119942A (en) 1982-03-16
SE7708027L (sv) 1979-01-12
US4511078A (en) 1985-04-16
EP0000374A1 (de) 1979-01-24

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