EP0471274A1 - Verpackungsbehälter mit einer streifenförmigen Öffnungsvorrichtung - Google Patents

Verpackungsbehälter mit einer streifenförmigen Öffnungsvorrichtung Download PDF

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Publication number
EP0471274A1
EP0471274A1 EP19910113209 EP91113209A EP0471274A1 EP 0471274 A1 EP0471274 A1 EP 0471274A1 EP 19910113209 EP19910113209 EP 19910113209 EP 91113209 A EP91113209 A EP 91113209A EP 0471274 A1 EP0471274 A1 EP 0471274A1
Authority
EP
European Patent Office
Prior art keywords
opening
strip
opening strip
packaging material
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.)
Granted
Application number
EP19910113209
Other languages
English (en)
French (fr)
Other versions
EP0471274B1 (de
Inventor
Tom Kjelgaard
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 Laval Holdings and Finance SA
Original Assignee
Tetra Laval Holdings and Finance SA
Tetra Alfa Holdings SA
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 Laval Holdings and Finance SA, Tetra Alfa Holdings SA filed Critical Tetra Laval Holdings and Finance SA
Publication of EP0471274A1 publication Critical patent/EP0471274A1/de
Application granted granted Critical
Publication of EP0471274B1 publication Critical patent/EP0471274B1/de
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
    • B65D5/72—Contents-dispensing means
    • B65D5/74—Spouts
    • 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
    • B65D5/02—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 by folding or erecting a single blank to form a tubular body with or without subsequent folding operations, or the addition of separate elements, to close the ends of the body
    • B65D5/06—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 by folding or erecting a single blank to form a tubular body with or without subsequent folding operations, or the addition of separate elements, to close the ends of the body with end-closing or contents-supporting elements formed by folding inwardly a wall extending from, and continuously around, an end of the tubular body
    • B65D5/064—Rectangular containers having a body with gusset-flaps folded outwardly or adhered to the side or the top of the container
    • B65D5/065—Rectangular containers having a body with gusset-flaps folded outwardly or adhered to the side or the top of the container with supplemental means facilitating the opening, e.g. tear lines, tear tabs
    • 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
    • B65D5/72—Contents-dispensing means
    • B65D5/74—Spouts
    • B65D5/741—Spouts for containers having a tubular body
    • B65D5/745—Spouts formed by deforming or tearing parts of the upper wall, combined with a deformation of a part of the body of the container

Definitions

  • the present invention relates to an opening arrangement in a package container produced from plastic-coated packaging material of the type which has a sealing fin extending transversely over a container wall, in which sealing fin the plastic coatings of opposing packaging material layers are united to one another in a sealing joint or splice, the packaging material layers accommodating, along at least a part of the sealing fin, an opening strip inlaid in the sealing fin, the strip being of a laminated material comprising an inner layer sandwiched between outer layers of a material sealed with good adhesion to the plastic coating of the packaging material.
  • plastic-coated packaging material for packing and transporting liquid foods such as milk, juice, wine etc.
  • the exact structure of such a packaging material varies depending upon what product is to be packed, but generally includes one or more body or carrier layers of paper or cardboard which impart to the package requisite rigidity and configurational stability, and outer coatings of a thermoplastic, preferably polythene, which not only make the package liquid-tight but also make it possible to give the package permanent desired geometric final form by means of so-called heat sealing.
  • packages of the type contemplated here are most generally produced by means of modern, rational packaging machines of the type which, either from a web or from prefabricated blanks of the packaging material, forms, fills and seals finished packages.
  • packages of the Tetra Brik® type are produced in that the web is first formed into a tube by the longitudinal edges of the web being united to one another in a longitudinal overlap seal or splice.
  • the tube is filled with the desired contents and divided into closed package units by repeated transverse seals of the tube along mutually spaced-apart transverse tube zones beneath the level of the contents of the tube.
  • the particular cushion-like packages are thereafter given desired geometric final form (in this specific case parallelepipedic) by an additional fold forming and sealing operation during which four double-walled triangular tabs or flaps occur at the corners of the package.
  • desired geometric final form in this specific case parallelepipedic
  • four double-walled triangular tabs or flaps occur at the corners of the package.
  • both of the upper corner flaps of the package are folded down and sealed to adjacent vertical side walls, while both of the lower corner flaps of the package are folded in and sealed against the planar bottom wall of the package.
  • the described prior art parallelepipedic package thus displays two sealing fins occasioned by transverse sealing of the tube, in which fins opposing material layers of the packaging material are united to one another inside-to-inside in a sealing splice formed by surface fusion.
  • One of these two sealing fins is, in such instance, located at the planar upper wall of the package, transversely over which it extends from tip to tip of both of the upper corner flaps folded down towards the side walls of the package and sealed, while the other sealing fin is correspondingly located at the bottom wall of the package across which it extends from tip to tip of both of the lower corner flaps folded in towards the bottom wall of the package and sealed.
  • the package has a longitudinal sealing splice which constitutes a part of the longitudinal overlap splice of the produced tube and which intersects the above-mentioned transverse sealing fins at a point between both of the corner flaps at the upper and lower end walls of the package, respectively.
  • a solution to the problem of opening such packages has instead been proposed in the art, using a tear thread or tear strip of the type described, for example, in Swedish Patent Specification 402,899.
  • the tear thread or tear strip is inlaid in the sealing fin from the tip of the triangular corner flap serving as pouring aperture or spout, up to and past the point of intersection of the sealing fin with the longitudinal overlap splice of the package so that the tear thread or tear strip becomes accessible from the outside of the package.
  • the exteriorly accessible portion of the tear thread or tear strip is drawn upwardly and rearwardly, whereby the sealing splice in the sealing fin between the abovementioned point of intersection and the tip of the triangular corner flap is severed, for the formation of a corresponding pour aperture.
  • the opening arrangement consists of a strip of laminated material which is inlaid in the sealing fin and comprises partly an inner layer of a material of high tensile strength and tearing resistance, eg. Oriented polyester, nylon, metal foil, etc., and partly outer coatings of a heat sealable plastic material, preferably polythene, disposed on either side of the inner layer.
  • the opening strip extends, like the above-described tear thread or tear strip, from the tip of the corner flap serving as pouring aperture or spout, up to and past the point of intersection between the sealing fin and the longitudinal overlap splice of the package and is, by means of the outer thermoplastic coatings of the opening strip, fixedly sealed to the opposing thermoplastic coatings of the package within the region of that portion of the sealing fin accommodating the strip.
  • the inner layer of the opening strip is subjected to some form of adhesion-improving pretreatment, so-called priming, and/or a suitable sealing temperature is selected, to achieve the desired sealing strength or bond between the inner layer of the opening strip and its outer thermoplastic coatings.
  • the demand placed in this instance is that the sealing strength between the inner layer of the opening strip and its outer thermoplastic coatings must be weaker than the sealing strength between the outer thermoplastic coatings of the opening strip and the thermoplastic coatings of the packaging material proper, while at the same time the sealing strength must be sufficiently great to prevent spontaneous delamination of the opening strip when the package is subjected to external stresses during normal transport and handling.
  • the opening procedure in a package with a laminated opening strip of the above-described type is based on the concept that the opening strip, on tearing of the sealing fin, is to delaminate in the interface layer between the inner layer and the outer thermoplastic coatings, for exposing the inner layer which is pulled off, at the same time as both of the outer thermoplastic coatings are left adhering against the packaging material in the region of the pouring aperture created.
  • Swedish Patent Specification 459,916 describes another prior art opening principle using a laminated opening strip which, in analogy with the previously described opening strip, incudes an inner layer of a material of good tensile strength and tearing resistance, preferably polyester, and outer coatings of sealable plastic material, preferably polythene.
  • the adhesion strength between all of the material layers included in the opening strip is intentionally high, with a view to making possible pulling-off of the opening strip without delamination between the layers in the opening strip.
  • easy pull-off of the opening strip is ensured without requiring the employment of excessive physical force in that the packaging material, in that portion of the sealing fin accommodating the strip, has been provided with a seal-weakening agent, eg.
  • the sealing strength between the packaging material layers is reduced in such a manner that the bonding strength between the outer thermoplastic coatings of the opening strip and the inner thermoplastic coatings of the packaging material is higher than the bonding strength between the fibre layers of the packaging material and its inner thermoplastic coating.
  • this opening arrangement presupposes that at least the major portion of the thus exposed fibre surface is impregnated with the moisture and liquid-protective water glass film, but in practice it has proved difficult to satisfy this requirement and it is not uncommon that the fibre surface, after tearing-off of the opening strip, is left without adequate protection.
  • the object of the present invention is, therefore, to propose a novel type of opening arrangement by means of which the above-discussed problems may be effectively obviated.
  • an opening arrangement of the type described by way of introduction has been given the characterizing feature that the opening strip displays, between the inner layer of the opening strip and each respective outer layer, an intermediary layer of a material of such properties that the adhesive bonding strength between all of the material layers included in the opening strip and between the outer layer of the opening strip and the plastic coating of the packaging material is greater than the internally cohesive bonding strength of the intermediary layer.
  • the opening arrangement according to the present invention operates on the principle that the opening strip is to delaminate completely within one material layer included in the opening strip, as opposed to the previously described prior art opening arrangements according to which the opening strip, in the first-mentioned case, is to delaminate between two material layers included in the opening strip, and, in the latter case, to delaminate between two material layers included in the packaging material, i.e. the fibre layer and the thermoplastic coating, while the opening strip per se is not to be delaminated, but to be torn off intact.
  • the internal or cohesive delamination in one of the material layers of the opening strip affords int. al. the advantage that the opening strip according to the present invention may be removed without the packaging material proper being affected or destroyed in the region of the opening, the fibre layers of the packaging material instead remaining well-protected by the enduring, intact thermoplastic coating of the packaging material and, to some degree, even extra protected by that part of the internally or cohesively delaminated material layer of the opening strip which remains adhering to the thermoplastic coating of the packaging material after tear-off of the opening strip, at the same time as the internal or cohesive bonding strength in the delaminable intermediary layer of the opening strip may readily be adjusted so that the opening strip is easy to pull-off without the need of applying excessively great tensile forces.
  • the cohesively delaminable intermediary layer of the opening strip consists of a physical mixture of polythene and polybutene, i.e. a mixture in which both of the above components are only physically admixed to one another without any element of chemical interreaction or other structural bonding between the components.
  • the proportions of each respective component included in the intermediary layer are determined by the desired cohesive bonding strength of the material and are selected according to the present invention such that the previously discussed optimation requirement between spontaneous or unintentional opening and intentional opening is satisfied.
  • the proportion of polybutene in the intermediary layer should amount to between 10 and 50 weight per cent, since an intermdiary layer containing less than 10 weight per cent of polybutene would require an excessively high tensile force to delaminate, while an intermediary layer containing more than 50 weight per cent would be far tooeasily delaminable and entail increased risk of spontaneous or unintentional opening of the package container.
  • a particularly well optimated intermediary layer should, according to the invention, contain approx. 25 weight per cent of polybutene.
  • the package container 1 shown in Figs. 1 and 2 is of the previously described Tetra Brik® type.
  • the package container 1 has a longitudinal sealing splice 2 of overlap type and a sealing fin 3 which extends along the upper end wall 4 of the package container 1.
  • the package container has a triangular, double-walled flap 5 which is intended to function as pouring aperture or spout and, in Fig. 1, the triangular flap has been broken up and partly raised from the side wall 6 of the package container against which the flap 5 is downwardly folded and sealed in the unopened package.
  • the edge of the overlapping material is cut obliquely along the region 8 and, in the point of intersection 7, a portion 9 of an opening strip 10 inlaid in the fin 3 projects out.
  • the projecting strip portion 9 may suitably be designed as or provided with a pull-ring or eye by means of which pull-off of the strip is facilitated.
  • the package container 1 is produced from a packaging laminate comprising a body or carrier layer 11 of paper or cardboard and outer thin coatings 12 and 13 of thermoplastic, preferably polythene.
  • the mutually facing material layers of the sealing fin 3 accommodate there-between the strip 10 inlaid in the sealing fin along a region which extends from the tip 5a of the double-walled triangular corner flap 5 and to the intersection point 7 between the longitudinal splice 2 and the sealing fin 3 from which the strip 10 is accessible by means of the projecting strip portion 9 preferably in the form of an eyelet or loop.
  • the strip 10 consists of a laminated material containing an inner layer 14 of plastic material of high tensile strength, preferably polyester, as well as outer coatings 15 of sealable plastic material, preferably polythene. Furthermore, the strip 10 is sealed with good adhesion to the surrounding material layers of the sealing fin 3 by surface fusion between the outer plastic coatings 15 of the strip and the opposing, inner plastic coatings 12 of the material layers.
  • the strip 10 is provided, between the inner layer 14 and each respective outer thermoplastic coating 15, with an intermediary layer 16 of a material of such properties that the adhesive bonding strength between all material layers included in the opening strip and between the outer layer 15 of the opening strip and the plastic coating 12 of the packaging material is considerably greater than the internally cohesive bonding strength in the intermediary layer 16.
  • the intermediary layer 16 consists of a physical mixture of polythene and polybutene containing between 10 and 50, preferably approx. 25 weight per cent of polybutene.
  • the intermediary layer 16 is produced by extrusion in such a manner and under such conditions that no structural or chemical bonding takes place between the two components included in the mixture.
  • the procedure illustrated in Figs. 1 and 2 is followed.
  • the double-walled triangular corner flap 5 sealed against the side wall 6 is raised so that it lies substantially flush with the upper end wall 4 of the package container, as shown in Fig. 1.
  • the freely projecting end 9 is grasped at the intersection point 7 between the longitudinal splice 2 of the package and the transverse sealing fin 3, by means of which end the opening strip 10 is pulled upwardly and rearwardly, to the right in Fig. 2, with a tensile force which is greater than the above-mentioned internal cohesive bonding strength of the intermediary layer 16, whereby the opening strip delaminates internally within each respective intermediary layer 16 for exposing a pouring aperture 17.
  • the pulled-off opening strip thus comprises the inner layer 14 and accompanying portions 16' of the delaminated intermediary layer 16 on both sides of the inner layer, while remaining portions of this layer, together with the outer thermoplastic coatings 15 of the opening strip stay adhering to the otherwise intact and unaffected packaging material within the region of the pouring aperture 17.
  • a package container 1 according to the present invention is very easy to open with the aid of the inlaid opening strip 10, without mobilizing excessive force and without the risk of adhesive delamination or derangement of the opening strip 10. Furthermore, the opening procedure is effectuated in such a manner that no part of the absorbent paper or cardboard fibres of the packaging material is exposed or even risks being exposed within the opening region.
EP91113209A 1990-08-14 1991-08-06 Verpackungsbehälter mit einer streifenförmigen Öffnungsvorrichtung Expired - Lifetime EP0471274B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9002640 1990-08-14
SE9002640A SE466800B (sv) 1990-08-14 1990-08-14 Med oeppning av remstyp foersedd foerpackningsbehaallare

Publications (2)

Publication Number Publication Date
EP0471274A1 true EP0471274A1 (de) 1992-02-19
EP0471274B1 EP0471274B1 (de) 1995-06-28

Family

ID=20380147

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91113209A Expired - Lifetime EP0471274B1 (de) 1990-08-14 1991-08-06 Verpackungsbehälter mit einer streifenförmigen Öffnungsvorrichtung

Country Status (17)

Country Link
EP (1) EP0471274B1 (de)
JP (1) JP3012369B2 (de)
KR (1) KR970010224B1 (de)
AT (1) ATE124357T1 (de)
AU (1) AU642283B2 (de)
CA (1) CA2048961C (de)
CZ (1) CZ282286B6 (de)
DE (1) DE69110791T2 (de)
DK (1) DK0471274T3 (de)
ES (1) ES2073624T3 (de)
HU (1) HU213549B (de)
NO (1) NO300887B1 (de)
RU (1) RU2039687C1 (de)
SE (1) SE466800B (de)
SK (1) SK278718B6 (de)
TW (1) TW217997B (de)
YU (1) YU48178B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0583575A1 (de) * 1992-07-02 1994-02-23 TETRA LAVAL HOLDINGS & FINANCE SA Offnungsvorrichtung für einen Verpackungsbehälter
US5917512A (en) * 1995-05-29 1999-06-29 J. S. Staedler Gmbh & Co. Cleaning container and method for cleaning a printhead of an ink jet printer

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7866473B2 (en) 2004-07-29 2011-01-11 Kimberly-Clark Worldwide, Inc. Flexible package having an easy opening feature
CN107831066B (zh) * 2017-10-27 2021-01-12 燕京啤酒(桂林漓泉)股份有限公司 一种判定瓦楞纸箱热熔胶封箱牢固度是否符合要求的方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE451064B (sv) * 1981-12-30 1987-08-31 Tetra Pak Int Anordning vid forpackningsbehallare
SE459916B (sv) * 1987-12-23 1989-08-21 Roby Teknik Ab Oeppningsanordning vid foerpackningsbehaallare
US4872562A (en) * 1987-04-10 1989-10-10 Minnesota Mining And Manufacturing Company Gable-top container
EP0352245A2 (de) * 1988-07-18 1990-01-24 AB AKERLUND & RAUSING Aufreissstreifen, dessen Herstellungsverfahren und diesen enthaltende Verpackung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE451064B (sv) * 1981-12-30 1987-08-31 Tetra Pak Int Anordning vid forpackningsbehallare
US4872562A (en) * 1987-04-10 1989-10-10 Minnesota Mining And Manufacturing Company Gable-top container
SE459916B (sv) * 1987-12-23 1989-08-21 Roby Teknik Ab Oeppningsanordning vid foerpackningsbehaallare
EP0352245A2 (de) * 1988-07-18 1990-01-24 AB AKERLUND & RAUSING Aufreissstreifen, dessen Herstellungsverfahren und diesen enthaltende Verpackung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0583575A1 (de) * 1992-07-02 1994-02-23 TETRA LAVAL HOLDINGS & FINANCE SA Offnungsvorrichtung für einen Verpackungsbehälter
US5322214A (en) * 1992-07-02 1994-06-21 Tetra Laval Holdings & Finance S.A. Opening arrangement for a packaging container
US5917512A (en) * 1995-05-29 1999-06-29 J. S. Staedler Gmbh & Co. Cleaning container and method for cleaning a printhead of an ink jet printer

Also Published As

Publication number Publication date
JPH06211239A (ja) 1994-08-02
CA2048961C (en) 2000-11-21
YU48178B (sh) 1997-07-31
ATE124357T1 (de) 1995-07-15
DK0471274T3 (da) 1995-08-28
NO300887B1 (no) 1997-08-11
AU8177091A (en) 1992-02-20
NO913105L (no) 1992-02-17
TW217997B (de) 1993-12-21
CZ282286B6 (cs) 1997-06-11
DE69110791T2 (de) 1995-11-23
ES2073624T3 (es) 1995-08-16
EP0471274B1 (de) 1995-06-28
SE466800B (sv) 1992-04-06
KR920004245A (ko) 1992-03-27
RU2039687C1 (ru) 1995-07-20
SE9002640L (sv) 1992-02-15
DE69110791D1 (de) 1995-08-03
CS252091A3 (en) 1992-04-15
HU213549B (en) 1997-07-28
JP3012369B2 (ja) 2000-02-21
CA2048961A1 (en) 1992-02-15
KR970010224B1 (en) 1997-06-23
HUT66629A (en) 1994-12-28
HU912695D0 (en) 1992-01-28
AU642283B2 (en) 1993-10-14
SK278718B6 (sk) 1998-01-14
YU139391A (sh) 1995-01-31
SE9002640D0 (sv) 1990-08-14
NO913105D0 (no) 1991-08-09

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