EP0000374A1 - Verfahren zum Herstellen eines Verpackungslaminates und nach diesem hergestelltes Verpackungslaminat - Google Patents

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

Info

Publication number
EP0000374A1
EP0000374A1 EP78100315A EP78100315A EP0000374A1 EP 0000374 A1 EP0000374 A1 EP 0000374A1 EP 78100315 A EP78100315 A EP 78100315A EP 78100315 A EP78100315 A EP 78100315A EP 0000374 A1 EP0000374 A1 EP 0000374A1
Authority
EP
European Patent Office
Prior art keywords
laminate
carrier layer
packing
folding
layers
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.)
Granted
Application number
EP78100315A
Other languages
English (en)
French (fr)
Other versions
EP0000374B1 (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

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
    • 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 for the design of a packing laminate with the purpose of preventing crack formation in the outer layer of the laminate when several layers of laminate are folded at the same time during the transforming of the laminate to packing containers.
  • the invention also relates to a laminated material manufactured according to the method comprising a carrier layer and homogeneous plastic layers covering the carrier layer.
  • 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 layer experiences a 180 0 folding and that the packing container wall in the actual sealing area consists of three laminate layers, 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 layer which after the folding is located on the outside of the fold (that is to say, the material layers 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 occuring.
  • a further preferred embodiment of the method in accordance with the invention has been given moreover the characteristic that the carrier layer is provided with an annular cutting around the area where the folding lines converge or cross one another, whereupon the carrier layer material in the cut-out area is removed.
  • This method has proved extraordinarily effective in the critical areas where two 180° foldings cross one another.
  • a further preferred embodiment of the method in accordance with the invention has been given moreover the characteristic that the cutting is in the form of two or more crossing lines, the point of intersection of which coincides with the point of intersection of two or more crossing folding lines.
  • This embodiment of the method substantially brings about the same advantages as the embodiment described previously, according to which part of the carrier layer is cut out and removed, but is in most cases simpler to realize.
  • a further preferred embodiment of the method in accordance with the invention has been given moreover the characteristic that the cutting is carried out in the carrier layer which after folding and forming of the packing container is located on the outside of the fold.
  • a further preferred embodiment of the method in accordance with the invention has been given moreover the characteristic that the cutting is carried out in the carrier layer which on folding of the laminate is subjected to tensile stresses.
  • a further preferred embodiment of the method in accordance with the invention has been given moreover the characteristic that the cutting is carried out in the carrier layer which after folding and forming of the packing container is located on the inside of the fold.
  • the invention also relates to a packing laminate manufactured according to the abovedescribed 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 provided with perforated portions.
  • a preferred embodiment of the packing laminate in accordance with the invention has been given moreover 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 layer 3 which constitutes the actual packing material wall in the sealing region, together with two material layers 4 and 5 forming the sealing fin 2.
  • the material layer 4 constitutes a part of the material layer 3 folded over about 180°
  • the material layer 5 constitutes a continuation of the outer one of the two wall portions sealed together in the sealing fin.
  • the material layer 5 situated inside the neutral plane will be pressed together at the place of folding and compressed whilst the two material layers 3 and 4 situated outside the neutral plane will be subjected to tensile stresses, which are considerably higher in the material layer 3 which is located outermost.
  • These tensile stresses give rise to crack formation in the carrier layer of the material layer 3, which is indicated by reference numeral 7, and frequently also to crack formation in the carrier layer of the material layer 4 located inside.
  • This crack formation is of minor importance. Owing to the large tensile stresses in the material layer 3 located outermost, though, crack formation frequently occurs also in the thermoplastic material layer of this laminate, 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 layers 3 and 4.
  • the tensile stresses are reduced in the outer layers 3 and 4 through bringing them closer to the neutral plane where the stresses are smaller, and more particularly this is done according to an embodiment of the invention in that the carrier layers of the material layers 3 and 4 (which of course are attached to one another, see fig. 1) are cut out and are preferably also removed in the area where the two foldings about 180 0 cross one another.
  • thermoplastic layer in the two material layers 3 and 4 after the removal of the carrier layer in the said material layers, can now follow in the actual place of the folding a line which in the acutal 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 layers are reduced instead in that the carrier layer is cut through in the area 8 (fig. 3) in the material layer 5 which is located inside the neutral plane (fig. 5).
  • this material layer 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 layers 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 thus 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 layer 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.
  • the embodiment described prevents very effectively a crack formation in the remaining layers.
  • the portion of material punched out constitutes material wastage which has to be removed and handled, which may cause difficulties at the very high speeds which occur in the material manufacture.
  • a further embodiment of the invention is also suggested, according to which instead of cutting off and removing a part of the carrier layer, the carrier layer is provided with a cutting in the form of two or more crossing lines, the point of intersection of which coincides with the point of intersection of two or more crossing folding lines. This method gives the carrier layer greater flexibility at the place of folding and reduces the stresses in the thermoplastic and aluminium layers.
  • the method is not as effective, however, as the embodiment described earlier but can nevertheless be used advantageously in cases where the laminate is relatively thin and the stresses are not too great.
  • the cutting takes place within the area 8 (fig. 3) in the material portion which forms the two material layers 3 and 4 or in the laminate layer 5.
  • the cutting of the carrier layer is appropriately carried out in this embodiment too before the lamination of the material with thermoplastic or aluminium foil.
  • a packing laminate in accordance with the invention comprises a carrier layer together with homogeneous plastic layers 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 in accordance with the invention with perforated portions of the carrier layer at the places where the packing laminate has converging or crossing folding lines.
  • a preferred form of the packing laminate in accordance with the invention results if 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)
  • Cartons (AREA)
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 true EP0000374A1 (de) 1979-01-24
EP0000374B1 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)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027668A1 (de) * 1979-10-18 1981-04-29 Ab Tetra Pak Mit Faltlinien versehenes Verpackungslaminat
EP0936150A1 (de) * 1998-02-13 1999-08-18 Tetra Laval Holdings & Finance Sa Vorgekerbtes Blattmaterial zum Verpacken flüssiger Nahrungsmittel und aus diesen hergestellten Verpackungen
WO2010122099A1 (en) 2009-04-23 2010-10-28 Dsm Ip Assets B.V. Compressed sheet

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US5223194A (en) * 1988-08-01 1993-06-29 Tetra Alfa Holdings S.A. Flexible packing material in sheet or web form
EP0353496B1 (de) * 1988-08-01 1995-03-15 Tetra Laval Holdings & Finance SA Flexibles Verpackungsmaterial in Folien- oder Bahnform
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
US6085970A (en) * 1998-11-30 2000-07-11 Insulair, Inc. Insulated cup and method of manufacture
EP1744964A4 (de) * 2004-04-22 2011-08-31 Dixie Consumer Products Llc Isolierbecherhülle und mit hülle ausgebildeter isolierter behälter
US7767049B2 (en) * 2006-10-12 2010-08-03 Dixie Consumer Products Llc Multi-layered container having interrupted corrugated insulating liner

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US3067923A (en) * 1960-11-15 1962-12-11 Minnesota Mining & Mfg Carton
GB973801A (en) * 1959-11-16 1964-10-28 American Can Co A self-sustaining carton or container

Family Cites Families (5)

* 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
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
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
GB973801A (en) * 1959-11-16 1964-10-28 American Can Co A self-sustaining carton or container
US3067923A (en) * 1960-11-15 1962-12-11 Minnesota Mining & Mfg Carton

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0027668A1 (de) * 1979-10-18 1981-04-29 Ab Tetra Pak Mit Faltlinien versehenes Verpackungslaminat
EP0936150A1 (de) * 1998-02-13 1999-08-18 Tetra Laval Holdings & Finance Sa Vorgekerbtes Blattmaterial zum Verpacken flüssiger Nahrungsmittel und aus diesen hergestellten Verpackungen
WO2010122099A1 (en) 2009-04-23 2010-10-28 Dsm Ip Assets B.V. Compressed sheet

Also Published As

Publication number Publication date
SU1037833A3 (ru) 1983-08-23
IT7825455A0 (it) 1978-07-07
DE2860818D1 (en) 1981-10-15
EP0000374B1 (de) 1981-07-08
AU523844B2 (en) 1982-08-19
CA1119942A (en) 1982-03-16
IT1096930B (it) 1985-08-26
US4511078A (en) 1985-04-16
AU3790078A (en) 1980-01-17
SE7708027L (sv) 1979-01-12

Similar Documents

Publication Publication Date Title
US4287247A (en) Packing laminate provided with crease lines
US4595116A (en) Opening arrangement for packing containers and a method for the manufacture of the same
EP0000374A1 (de) Verfahren zum Herstellen eines Verpackungslaminates und nach diesem hergestelltes Verpackungslaminat
US11299314B2 (en) Package sleeve, package and method for manufacturing a package
US4267957A (en) Packing container and a laminate for its manufacture
US4559259A (en) Packing laminate provided with crease lines
US4566928A (en) Method of manufacturing packing container having tear-up opening arrangement
US20190337664A1 (en) Package Sleeve, Package and Method for Manufacturing a Package
JPS63138945A (ja) 液状内容物用包装容器
EP0083441B1 (de) Verpackungsbehälter
SE432576B (sv) Forpackningsbehallare for trycksatt fyllgods samt sett att tillverka densamma
US4080235A (en) Method for providing a laminate web with a firm edge strip
US4331288A (en) Packing container
CA1069861A (en) Parallelepipedic packing container and a method for its manufacture
US4720039A (en) Paperboard container
US6413199B1 (en) Method of manufacturing edge-sealed packaging container blanks
US5322214A (en) Opening arrangement for a packaging container
EP3663219A1 (de) Verpackung
EP0089501A1 (de) Verpackung
JP3314105B2 (ja) 包装袋の製造方法
JPS5854359Y2 (ja) 防湿性と熱封緘性とを有する多層紙袋
JPS6030273B2 (ja) 紙袋の製造方法
ITTO970079U1 (it) Sacco da film di materiale sintetico per rifiuti domestici.
CA2082403A1 (en) Method for producing a sealed package, cut blank for the production of the package and produced package

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): CH DE FR GB NL

17P Request for examination filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): CH DE FR GB NL

REF Corresponds to:

Ref document number: 2860818

Country of ref document: DE

Date of ref document: 19811015

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19970620

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19970624

Year of fee payment: 20

Ref country code: CH

Payment date: 19970624

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19970625

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19970626

Year of fee payment: 20

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 19980705

Ref country code: CH

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 19980705

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 19980706

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Effective date: 19980705

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

NLV7 Nl: ceased due to reaching the maximum lifetime of a patent

Effective date: 19980706

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT