US3830140A - Method of making packaging containers - Google Patents

Method of making packaging containers Download PDF

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Publication number
US3830140A
US3830140A US00355167A US35516773A US3830140A US 3830140 A US3830140 A US 3830140A US 00355167 A US00355167 A US 00355167A US 35516773 A US35516773 A US 35516773A US 3830140 A US3830140 A US 3830140A
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US
United States
Prior art keywords
web
thermoplastic material
container
homogeneous
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 - Lifetime
Application number
US00355167A
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English (en)
Inventor
G Rausing
S Stark
S Sevrell
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 Developpement 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
Priority to SE08821/71A priority Critical patent/SE346968B/xx
Priority claimed from US266721A external-priority patent/US3924796A/en
Application filed by Tetra Pak Developpement SA filed Critical Tetra Pak Developpement SA
Priority to US00355167A priority patent/US3830140A/en
Application granted granted Critical
Publication of US3830140A publication Critical patent/US3830140A/en
Assigned to AKTIEBOLAGET TETRA PAK reassignment AKTIEBOLAGET TETRA PAK CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). (SWEDEN) Assignors: TETRA PAK INTERNATIONAL AKTIEBOLAG
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
    • 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
    • B65D5/067—Gable-top containers
    • B65D5/068—Gable-top containers 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
    • B65D5/56—Linings or internal coatings, e.g. pre-formed trays provided with a blow- or thermoformed layer
    • B65D5/563—Laminated linings; Coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2105/00—Rigid or semi-rigid containers made by assembling separate sheets, blanks or webs
    • B31B2105/001—Rigid or semi-rigid containers made by assembling separate sheets, blanks or webs made from laminated webs, e.g. including laminating the webs

Definitions

  • ABSTRACT A method of making a packaging container in which the finished container has a sealing fin extending upwardly from the top of the container and transversely of the container, said fin comprising two sections of the container blank which are heat sealed together by the use of a layer of thermoplastic material on the sections, said layer being molecularly oriented in the longitudinal direction of the tin so that opening of the package may be facilitated.
  • the present invention relates to a packing container of the type that is manufactured from a web or a flat blank of a thermoplastic-coated carrier material by folding and heat-sealing of the packing material, the intention being to close the packing container formed after filling by means of sealing along a sealing fin which extends transversely across the packing containers.
  • a packing material which consists of a carrier layer which is coated, at least on the side which is intended to form the inside of the packing containers, with a homogeneous, heat-scalable plastic material.
  • the carrier material used most commonly is paper or cardboard and the coating material occurring most commonly is probably polyethylene, and the packing material is manufactured most frequently in the form of a web, from which either package blanks are punched out, or from which the packing containers are made by folding the web into a tube which is then sealed along its longitudinal edges, whereupon the tube can be filled with the filling goods and be sealed up to individual packages by means of successive transverse sealings at a distance from one another.
  • packing containers are intended to be manufactured from blanks, these are punched out first as mentioned above, from the packing material web, whereupon the said blanks are formed to packing containers by folding them along folding lines, preferably provided in advance, which facilitate the folding, and these packing containers are then closed by heat-sealing, which is made possible by virtue of the said thermoplastic coatmgs.
  • the packages of the above-mentioned type which are manufactured of paper or cardboard with a thermoplastic layer of e.g. polyethylene, are relatively hard to open, however, since the carrier material layer is difficult to tear and the thermoplastic layer supplies a tough inner membrane which renders more difficult the ripping open of the packages.
  • a thermoplastic layer e.g. polyethylene
  • the carrier material layer is difficult to tear and the thermoplastic layer supplies a tough inner membrane which renders more difficult the ripping open of the packages.
  • To facilitate the opening of these known packages it is customary to arrange tearing indications in the package walls in the form of perforations partly breaking through the package walls. It has become apparent, however, that these tearing indications are not as effective as would be desired, and that it is difficult besides to arrange these tearing indications in the packing material in such a manner that an absolute guarantee exists that the packaging material will not be completely punched through.
  • the carrier material is made of polystyrene foam which is coated with one or more plastic layers of one or more thermoplastic materials which plastic layer or layers is or are given molecular orientation in a direction which coincides with the longitudinal direction of the said sealing fins.
  • the invention concerns the manner of manufacture of a packing container in accordance with the invention, which manner is characterized in that a web of polystyrene foam is coated by extrusion with one or more homogenuous layers of thermoplastic material, the coating being carried out so that the speed of the web is kept higher than the speed at which the thermoplastic material issues from the extruder, which has the result that the thermoplastic layer or layers is or are subjected to a molecule-orienting stretching in connection with the coating, that the packing blanks are punched from the web, the said blanks at the punching being oriented in such a manner in relation to the web, that the parts which are intended to form the sealing tins of the packing containers are orientated in the longitudinal direction of the web.
  • FIG. 1 shows a packing material web indicating a row of packing blanks arranged one after the other
  • FIGS. 2a, 2b, and 2c show a finished package and how the same is opened
  • FIG. 3 shows a method for the manufacture of packing material for packages in accordance with the invention
  • FIG. 4 shows an enlarged cross-section through a packaging material web.
  • FIG. 1 shows a packing material web 1, on which packing blanks 2 are arranged one after the other.
  • the packing blanks 2 before they are separated from the web but after the folding lines facilitating the folding have been put on the web 1.
  • the packing blanks 2 are oriented across the packing material web 1, and each packing blank 2 has four side walls 4 and a longitudinal joint section 13, which is intended to be used as conmeeting section when the packing blank 2 through folding has acquired tubular shape with square or rectangular cross-section.
  • Each one of the packing blanks 2 is provided moreovoer with top closure sections 5,9,10, and bottom closure flaps 7,8,11.
  • the hatched areas 6 are meant to be punched away from the web and the punched away material has to be removed as unavoidable waste.
  • the top closure sections of the packing blank 2 comprise two rectangular sections 5 and two triangular sections 9, the sections 5 and 9 being joined to one another by means of triangular backfolding sections 10.
  • the rectangular sections 5 as well as the backfolding sections 10 are joined moreover to the sealing section 3.
  • the triangular sections 9 are folded in towards one another over the opening of the packing container, the backfolding sections 10 coming to be located between the rectangular sections 5 and the triangular sections 9.
  • the closure sections 3 will be placed together to form a flattened sealing fin 16.
  • the bottom of the package is formed in a similar manner as the top of the package, but with the difference that the bottom-forming flaps 7,8,11,12 are not connected to any sealing section, but the sealing of the bottom is done in that the longer of the rectangular bottom sections 8 with its outer part has to overlap the shorter rectangular flap 7 and that all the bottomforrning sections are folded together in a flat bottom which is pressed together between heated surfaces so that the thermoplastic coatings are made to melt and retain the bottom-forming sections in the position where they are inserted in each other.
  • FIG. 2a a finished package in which the folded together closure sections 3 form a sealing fin 16.
  • the sealing sections 3 are sealed to each other along a sealing region 17, which in the case shown here does not extend over the whole height of the sealing fin 16.
  • the packing material instead of cardboard is made of foamed plastic, e.g. an extruded polystyrene foam which is coated with a layer of homogeneous plastic oriented in longitudinal direction of the web the opening work will become considerably easier owing to the fact that an extruded film of polystyrene foam will be readily tearable without any weakening being provided beforehand in the packing material.
  • This homogeneous foamed plastic layer can in fact be readily torn in orientation direction, whilst it is very difficult to rip it in other directions.
  • the packing material can very easily be torn in the direction of orientation of the homogeneous plastic layer whilst it can be torn only with difficulties in other directions.
  • the packing blanks are punched out of a web in the manner as shown in FIG. 1, where the carrier packing material layer consists of extruded polystyrene foam and the homogeneous plastic layer consists of polystyrene film which is molecule-oriented in longitudinal direction of the web.
  • the homogeneous plastic layer in the embodiment shown here has its direction of orientation in the same direction as the length of the sealing fin 16, it becomes simple to rip off the sealing fin 16 along the area 18 below the sealing region 17, but for further facilitation of the tearing it is of course possible to provide a light perforation or slots along the tearing area 18.
  • the invention also relates to the manner of manufacture of a packing material of the kind which is used in packages in accordance with the invention, that is to say a packing material which consists of a web of polystyrene foam with a coat of homogeneous, moleculeoriented plastic material, which is molecule-oriented in the direction of the web.
  • the homogeneous plastic material may preferablyconsist of homogeneous polystyrene film and the polystyrene foam web can likewise preferably be extruded.
  • FIG. 3 is shown how a previously manufactured, extruded polystyrene foam web 30 is rolled off a cylinder and is passed over guide rolls 26,27 and subsequently underneath an extruder 31.
  • FIG. 4 is shown an enlarged cross-section through a manufactured packing material web, the polystyrene foam layer being marked 30 and the extruded and oriented homogeneous polystyrene layer marked 32.
  • polystyrene foam material is not moisture-absorbing, in the same manner as paper or cardboard however, and an outside coating of plastic material is therefore not essential as a protection of the packages against atmospheric moisture.
  • a method for manufacturing a packaging container comprising moving a web of polystyrene foam packaging material longitudinally of its length, extruding thereonto at least one layer of at least one homogeneous thermoplastic material at a speed substantially less than the speed of the web so as to effect a stretching of the extruded homogeneous thermoplastic material on the web of packaging material to molecularly orient the thermoplastic material in the longitudinal direction of the web, passing the coated web between cooled press rolls to laminate the coated web, cutting blanks from the web and erecting said blanks to form containers having a sealing fin at the top thereof extending upwardly from the top of the container and transversely thereacross, the molecular orientation of the homogeneous thermoplastic material being in the longitudinal direction of the sealing fin whereby tearing of the sealing fin will be facilitated when opening the container.
  • a method as claimed in claim 1 wherein the at least one homogeneous thermoplastic material is ex- 6 truded in such an amount that the layer, after stretchethylene and polypropylene. ing, will have a thickness of from about 0.02 to about 5
  • the at 4 A method as claimed in claim 1 wherein the at least one homogeneous thermoplastic material is se- 5 styrenelected from the group consisting of polystyrene, polyleast one homogeneous thermoplastic material is poly-

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)
US00355167A 1971-07-08 1973-04-27 Method of making packaging containers Expired - Lifetime US3830140A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE08821/71A SE346968B (enrdf_load_stackoverflow) 1971-07-08 1971-07-08
US00355167A US3830140A (en) 1971-07-08 1973-04-27 Method of making packaging containers

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE08821/71A SE346968B (enrdf_load_stackoverflow) 1971-07-08 1971-07-08
US266721A US3924796A (en) 1971-07-08 1972-06-27 Packaging containers
US00355167A US3830140A (en) 1971-07-08 1973-04-27 Method of making packaging containers

Publications (1)

Publication Number Publication Date
US3830140A true US3830140A (en) 1974-08-20

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US00355167A Expired - Lifetime US3830140A (en) 1971-07-08 1973-04-27 Method of making packaging containers

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US (1) US3830140A (enrdf_load_stackoverflow)
SE (1) SE346968B (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4740163A (en) * 1983-11-02 1988-04-26 James River-Norwalk, Inc. Channel opening feature for cartons
US5383835A (en) * 1992-11-02 1995-01-24 Gordon; Robert L. Gas barrier folding carton construction
US5753063A (en) * 1994-12-27 1998-05-19 Toyoda Gosei Co., Ltd. Method of decorating rubber extruded product
US20030101684A1 (en) * 2000-07-03 2003-06-05 Paolo Scarabelli Packaging machine for continuously producing sealed packages
US6748720B2 (en) 1999-12-10 2004-06-15 Tetra Laval Holdings & Finance S.A. Continuous apparatus in distribution equipment
US20050045271A1 (en) * 2003-08-30 2005-03-03 Hunter Robert J. Method of producing reinforced cartons
US20060000544A1 (en) * 2004-01-09 2006-01-05 Riverwood International Corporation Method of producing cartons
US20070137771A1 (en) * 2000-04-27 2007-06-21 Zoeckler Michael D Paperboard Cartons With Laminated Reinforcing Ribbons And Transitioned Scores And Method Of Making Same
US8317671B1 (en) 2000-04-27 2012-11-27 Graphic Packaging International, Inc. Paperboard cartons with laminated reinforcing ribbons and method of making same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE456335B (sv) * 1985-06-11 1988-09-26 Moelnlycke Ab For sterila artiklar avsedd forpackning

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2175125A (en) * 1937-06-15 1939-10-03 Reynolds Res Corp Method for forming films and film coatings
US2944586A (en) * 1956-04-20 1960-07-12 Lowe Paper Co Extrusion coating apparatus
US2984161A (en) * 1953-07-07 1961-05-16 United Wallpaper Inc Manufacture of carton blanks
US3227054A (en) * 1965-06-14 1966-01-04 American Can Co Method of forming composite packaging material
US3518144A (en) * 1966-03-25 1970-06-30 Akerlund & Rausing Ab Method for providing carton blanks with a coating of plastic
US3682730A (en) * 1969-11-14 1972-08-08 Mobil Oil Corp Method for laminating oriented thermoplastic film to thermoplastic foam
US3700525A (en) * 1969-04-03 1972-10-24 Int Paper Co Method of making a laminate having varying thickness

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2175125A (en) * 1937-06-15 1939-10-03 Reynolds Res Corp Method for forming films and film coatings
US2984161A (en) * 1953-07-07 1961-05-16 United Wallpaper Inc Manufacture of carton blanks
US2944586A (en) * 1956-04-20 1960-07-12 Lowe Paper Co Extrusion coating apparatus
US3227054A (en) * 1965-06-14 1966-01-04 American Can Co Method of forming composite packaging material
US3518144A (en) * 1966-03-25 1970-06-30 Akerlund & Rausing Ab Method for providing carton blanks with a coating of plastic
US3700525A (en) * 1969-04-03 1972-10-24 Int Paper Co Method of making a laminate having varying thickness
US3682730A (en) * 1969-11-14 1972-08-08 Mobil Oil Corp Method for laminating oriented thermoplastic film to thermoplastic foam

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4740163A (en) * 1983-11-02 1988-04-26 James River-Norwalk, Inc. Channel opening feature for cartons
US5383835A (en) * 1992-11-02 1995-01-24 Gordon; Robert L. Gas barrier folding carton construction
US5753063A (en) * 1994-12-27 1998-05-19 Toyoda Gosei Co., Ltd. Method of decorating rubber extruded product
US6748720B2 (en) 1999-12-10 2004-06-15 Tetra Laval Holdings & Finance S.A. Continuous apparatus in distribution equipment
US20080119343A1 (en) * 2000-04-27 2008-05-22 Zoeckler Michael D Paperboard Cartons with Laminated Reinforcing Ribbons and Transitioned Scores and Method of Making Same
US8403819B2 (en) 2000-04-27 2013-03-26 Graphic Packaging International, Inc. Paperboard cartons with laminated reinforcing ribbons and transitioned scores and method of making same
US8403820B2 (en) 2000-04-27 2013-03-26 Graphic Packaging International, Inc. Paperboard cartons with laminated reinforcing ribbons and transitioned scores and method of making same
US8317671B1 (en) 2000-04-27 2012-11-27 Graphic Packaging International, Inc. Paperboard cartons with laminated reinforcing ribbons and method of making same
US20070137771A1 (en) * 2000-04-27 2007-06-21 Zoeckler Michael D Paperboard Cartons With Laminated Reinforcing Ribbons And Transitioned Scores And Method Of Making Same
US20030101684A1 (en) * 2000-07-03 2003-06-05 Paolo Scarabelli Packaging machine for continuously producing sealed packages
US6962032B2 (en) 2000-07-03 2005-11-08 Tetra Laval Holdings & Finance S.A. Packaging machine for continuously producing sealed packages
US20050045271A1 (en) * 2003-08-30 2005-03-03 Hunter Robert J. Method of producing reinforced cartons
US20060000544A1 (en) * 2004-01-09 2006-01-05 Riverwood International Corporation Method of producing cartons

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Publication number Publication date
SE346968B (enrdf_load_stackoverflow) 1972-07-24

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Owner name: AKTIEBOLAGET TETRA PAK

Free format text: CHANGE OF NAME;ASSIGNOR:TETRA PAK INTERNATIONAL AKTIEBOLAG;REEL/FRAME:005150/0367

Effective date: 19870831