Patents Assigned to Tetra Pak International AB
  • Patent number: 5158633
    Abstract: A pack for liquids is made at least partially from cardboard or the like, which is impervious to liquid at least on its one surface, by virtue of a plastics coating. The pack has side walls (2-3), a bottom and a top wall (1), which are connected together at least partially by fold (9) and/or sealing seams (4), a tear-open pouring opening (6) which is disposed in the top wall (1) adjacent the edge line (9) and which is preferably covered over by a tear-off cover strip (7) and a pouring edge (8) which is disposed in one plane with the top wall (1). A separate plastics strip (10) is sealed in position in the region of the pouring opening (6), covering over same, and extends beyond the edge line (9) of the top wall (1) with an unsealed end (11), forming a pouring edge (8), and the surface of the plastics strip (10), which covers over the pouring opening (6), is stamped out, exposing the opening (6), and is laid over around the edge (12) of the opening and is sealed in position from the underside.
    Type: Grant
    Filed: January 11, 1991
    Date of Patent: October 27, 1992
    Assignee: Tetra Pak International AB
    Inventor: Hans Rausing
  • Patent number: 4998668
    Abstract: A pack for liquids is made at least partially from cardboard or the like, which is impervious to liquid at least on its one surface, by virtue of a plastics coating. The pack has side walls (1-3), a bottom and a top wall (1), which are connected together at least partially by fold (9) and/or sealing seams (4), a tear-open pouring opening (6) which is disposed in the top wall (1) adjacent the edge line (9) and which is preferably covered over by a tear-off cover strip (7) and a pouring edge (8) which is disposed in one plane with the top wall (1). A separate plastics strip (10) is sealed in position in the region of the pouring opening (6), covering over same, and extends beyond the edge line (9) of the top wall (1) with an unsealed end (11), forming a pouring edge (8), and the surface of the plastics strip (10), which covers over the pouring opening (6), is stamped out, exposing the opening (6), and is laid over around the edge (12) of the opening and is sealed in position from the underside.
    Type: Grant
    Filed: July 20, 1987
    Date of Patent: March 12, 1991
    Assignee: Tetra Pak International AB
    Inventor: Hans Rausing
  • Patent number: 4877160
    Abstract: A valve unit to be used in a packing machine of the type which manufactures filled and sealed non-returnable packages for dairy products such as milk, yogurt and the like from prefabricated blanks. The packages are filled one at a time by a metering pump and the liquid is fed from the pump to the package via the valve unit. The valve unit includes a check valve and a flexible nozzle which co-operate so as to prevent any after-dripping between pumping strokes. This is achieved in that the check valve with the help of a piston component, after the completed pumping stroke, creates a vacuum in the liquid filled valve unit. This vacuum affects the flexible nozzle so that it closes rapidly and effectively.
    Type: Grant
    Filed: March 29, 1989
    Date of Patent: October 31, 1989
    Assignee: Tetra Pak International AB
    Inventor: Jackie Derving
  • Patent number: 4828539
    Abstract: Described is a pack comprising a carrier material such as for example cardboard, which is coated with a thermoplastic material, for liquids, comprising a tube with a bottom and a cover which has a pouring spout, in the sealing region of which are disposed, beside sealing areas with a high adhesive force, sealing areas with a low adhesive force for the purposes of peeling the sealing areas apart.In order not to be dependent on agents which impair the sealing effect and on the disposition thereof on certain regions in the cover, and in order for the tooling to be simplified, the invention provides that the sealing area (40') with a low adhesive force is formed by a pattern of raised surfaces (6) which alternate with areas (5) disposed therebeside and at a lower level.
    Type: Grant
    Filed: February 4, 1988
    Date of Patent: May 9, 1989
    Assignee: Tetra Pak International AB
    Inventors: Bengt Jonsson, Sten Persson, David Wiggins
  • Patent number: 4819839
    Abstract: An opening arrangement for packing containers comprising a prepunched opening which is covered by a tear-off cover strip and a pouring rim element positioned between a wall of the packing container and the cover strip. In one of the embodiments, the pouring rim strip has an edge portion which projected partially over the opening of the packing container and a liquid-tight layer is joined to both an inside surface of the packing container wall and the edge portion of the pouring rim strip, as well as to a portion of the cover strip positioned over the opening. The application of the pouring rim as well as the manufacture of the opening arrangement as a whole are facilitated by joining in advance the pouring rim in a detachable manner to the cover strip, so the cover strip and the pouring rim can be applied as a unit.
    Type: Grant
    Filed: March 6, 1985
    Date of Patent: April 11, 1989
    Assignee: Tetra Pak International AB
    Inventors: Lars Carlsson, Kjell Martensson, Hans-Georg Melle
  • Patent number: 4820892
    Abstract: The invention relates to a heating arrangement for packing containers (5) which hold a liquid beverage. The heating arrangement functions in such a manner that induction currents are induced in an aluminium foil layer which is laminated into the packing material at the same time as a mechanical movement is imparted to the packing container (5) in order to bring about a circulation of the beverage. The induction currents are produced with the help of an inductor (1, 7, 10) which subjects selected, jointless parts of the packing container to a high-frequency electromagnetic field.
    Type: Grant
    Filed: March 10, 1988
    Date of Patent: April 11, 1989
    Assignee: Tetra Pak International AB
    Inventors: Gert Holmstrom, Paul Mellbin
  • Patent number: 4815655
    Abstract: Non-returnable packages for liquid contents, e.g. milk, are made frequently from a flexible packing laminate, and are provided with an opening arrangement in the form of a tear-off strip which covers a pouring opening in the packing container wall. So as to avoid spatter and spillage at the actual moment of opening, an opening arrangement for packing containers is realized comprising a pouring opening (8) which has a projection (8') of small area directed against the direction of tearing of the tearing strip (6). This part of the pouring opening (8) formed as a projection (8') thus will be opened first, and air will flow into the packing container, and the liquid level will drop so that the continued opening can be performed without any risk of spillage.
    Type: Grant
    Filed: August 14, 1987
    Date of Patent: March 28, 1989
    Assignee: Tetra Pak International AB
    Inventors: Kenth Jacobsson, Jan Lagerstedt
  • Patent number: 4792069
    Abstract: Pouring edges in the form of projecting material strips are used on packing containers for e.g. liquid foodstuffs. The pouring edge is generally covered by a tear-off cover strip 6 which also serves as a closure for a pouring opening 7. In order to prevent the pouring edge strip 8 from being torn off or deformed at the removal of the cover strip 6, the same is given a z-folded form and is joined to the outside of the packing container in two sealing areas situated at a distance from each other, the doubled area located in between projecting from the packing container and guiding the out-flowing liquid.
    Type: Grant
    Filed: October 9, 1987
    Date of Patent: December 20, 1988
    Assignee: Tetra Pak International AB
    Inventors: Hans Nantin, Ingemar Ohlsson
  • Patent number: 4782987
    Abstract: In the stepwise feeding of a packing material web for the application of cover strips over prepunched pouring openings, the pouring opening is sensed by means of a photocell which is located at as great a distance from the point of application as the distance between two pouring openings. Any errors in this distance will thus affect the accuracy of application. In order to avoid this is proposed in accordance with the invention to sense the passage of the actual pouring opening and start a countdown sequence, at the end of which the web feed is interrupted with the pouring opening in correct position for the application of the cover strip. An arrangement for the realization of this, seen in the direction of feed of the material web (1) comprises a sensing device (4), a processing device (5) and a forward feeding device (9) which are connected to a control unit (13).
    Type: Grant
    Filed: January 20, 1987
    Date of Patent: November 8, 1988
    Assignee: Tetra Pak International AB
    Inventors: Peter Giacomelli, Anders Sundberg
  • Patent number: 4782643
    Abstract: The invention relates to an arrangment for the continuous heat treatment and packaging of a liquid product with the object of sterilizing the product, the product being heated for a short time together with, and surrounded by, the packing material wherein it is to be enclosed. The product is introduced into a tube of flexible material whereupon the tube containing the product is introduced between two parallel metal bands, movable synchronously in their longitudinal direction, the tube being received and compressed between the bands so that the tube is transported with the bands at the same time as the cross-sectional area of the tube is reduced and the product is made to flow forward through the compressed tube in a gaplike space. Heat is transmitted to the product with the help of the metal bands (1) while the product present between the metal bands is kept under pressure.
    Type: Grant
    Filed: May 29, 1987
    Date of Patent: November 8, 1988
    Assignee: Tetra Pak International AB
    Inventor: Sven O. S. Stark
  • Patent number: 4755412
    Abstract: A packing laminate in the form of a web with thinned edge zones is manufactured by providing a wide raw material web simultaneously with a number of parallel thinned areas. The raw material web is then covered with layers of thermoplastic material, whereupon it is divided into webs of the desired width by means of cuts placed asymmetrically in the said thickness--reduced areas. As a result the finished laminate webs obtain thermoplastic-covered, thickness-reduced edge zones of different widths.
    Type: Grant
    Filed: November 3, 1982
    Date of Patent: July 5, 1988
    Assignee: Tetra Pak International AB
    Inventors: Jan-Erik Glans, Sven G. Nilsson
  • Patent number: 4747253
    Abstract: The manufacture of non-returnable packages for e.g. milk is frequently carried out by the conversion of web-shaped, laminated packing material to a tube, filling of the tube with milk and sealing and forming to filled packing containers of the desired, e.g. parallelepipedic, shape. During the forming, which is done by means of external forming devices, the contents are made use of as an internal mandrel or a holder-up for the forming devices, so that the desired shape can be achieved without creasing or other deformations. The above-mentioned forming principle works less well if the packing containers are not to be completely filled but have a certain air space or headspace. The proportioning of the contents also becomes uncertain and the desired accuracy of volume cannot always be achieved.
    Type: Grant
    Filed: April 17, 1987
    Date of Patent: May 31, 1988
    Assignee: Tetra Pak International AB
    Inventor: Diethard Schulte
  • Patent number: 4746058
    Abstract: A blank for packing containers having a carrier layer of paper or cardboard and a layer of thermoplastic-coated aluminum foil which is used for generating by means of induction devices the heat required for sealing overlapping plastic layers of the blank in a Z-shaped configuration wherein the aluminum foil layer is removed locally along the sealing regions in outer layers but is kept intact in the inner layer.
    Type: Grant
    Filed: January 22, 1986
    Date of Patent: May 24, 1988
    Assignee: Tetra Pak International AB
    Inventor: Jorgen Niske
  • Patent number: 4744467
    Abstract: Described is a pack comprising a carrier material such as for example cardboard, which is coated with a thermoplastic material, for liquids, comprising a tube with a bottom and a cover which has a pouring spout, in the sealing region of which are disposed, beside sealing areas with a high adhesive force, sealing areas with a low adhesive force for the purpose of peeling the sealing areas apart.In order not to be dependent on agents which impair the sealing effect and on the disposition thereof on certain regions in the cover, and in order for the tooling to be simplified, the invention provides that the sealing area (40') with a low adhesive force is formed by a pattern of raised surfaces (6) which alternate with areas (5) disposed therebeside and at a lower level.
    Type: Grant
    Filed: December 19, 1985
    Date of Patent: May 17, 1988
    Assignee: Tetra Pak International AB
    Inventors: Bengt Jonsson, Sten Persson, David Wiggins
  • Patent number: 4732268
    Abstract: An arrangement on a conveyor of the type which comprises a flexible chain whereupon objects, e.g. parallelepipedic packing containers, are conveyed. The conveyor comprises guide rails (4) located on either side of the chain (1) which steer the packing container. In curves the guide rails are substituted on the one side by a curve disc (5) having a sloping steering surface (8) which acts upon the packing container outwards against the guide rails located on the opposite side of the conveyor. As a result packing containers of different sizes can be conveyed on the conveyor without the conveyor needing adjustment.
    Type: Grant
    Filed: April 29, 1986
    Date of Patent: March 22, 1988
    Assignee: Tetra Pak International AB
    Inventor: Uno Sjostrand
  • Patent number: 4731250
    Abstract: The invention relates to a method and an arrangement for the continuous heat treatment and packaging of a liquid product with the object of sterilizing the product, the product being heated for a short time together with, and surrounded by, the packing material wherein it is to be enclosed. The product is introduced into a tube of flexible material whereupon the tube containing the product is introduced between two parallel metal bands, movably synchronously in their longitudinal direction, the tube being received and compressed between the bands so that the tube is transported with the bands at the same time as the cross-sectional area of the tube is reduced and the product is made to flow forward through the compressed tube in a gaplike space. Heat is transmitted to the product with the help of the metal bands while the product present between the metal bands is kept under pressure.
    Type: Grant
    Filed: April 17, 1987
    Date of Patent: March 15, 1988
    Assignee: Tetra Pak International AB
    Inventor: Sven O. S. Stark
  • Patent number: 4730769
    Abstract: Described is a packaging for liquid, made of cardboard, which is made impermeable to liquid by means of a plastic coating over its surface. It has side-walls, base and top wall (5), connected to one another by folded and/or sealed seams. A pouring aperture is located in top wall (5) close to the edge line, and can be torn off and has a separate plastic strip (8) covering the pouring aperture and being applied round the edge of the pouring aperture, and is sealed on at least from the inside.
    Type: Grant
    Filed: April 11, 1986
    Date of Patent: March 15, 1988
    Assignee: Tetra Pak International AB
    Inventor: Sven O. S. Stark
  • Patent number: 4715791
    Abstract: An arrangement for the volume-controlled feed of a medium, e.g. a liquid, in an outer flow system, comprising a movable pump piston (10) and a metering chamber (20) in connection, or connectable, to the flow system via a valve-controlled inlet (22) and outlet (23) for the intake and discharge respectively of the medium in time with the working cycles of the pump piston (10). To make possible the change between different desired feed volumes of the medium the arrangement has a wall element (15) delimiting the volume of the metering chamber (20) which is movable inside the metering chamber (20) for the adjustment of the desired metering chamber volume.
    Type: Grant
    Filed: August 18, 1986
    Date of Patent: December 29, 1987
    Assignee: Tetra Pak International AB
    Inventors: Bo Berlin, Gert Nedstedt
  • Patent number: 4715528
    Abstract: An opening arrangement on a packing container of the type which comprises a pouring opening 6 formed in the upper side of the container. The opening arrangement comprises a cover strip 8 and a pouring edge strip 7 arranged between the cover strip 8 and the packing container. To make possible the reclosure of the pouring opening 6 the cover strip 8 is provided with a gripping strip 9' sealed to its underside which preferably has a free gripping edge 9" facilitating the hooking of the cover strip 8 to the pouring tab 7.
    Type: Grant
    Filed: September 9, 1986
    Date of Patent: December 29, 1987
    Assignee: Tetra Pak International AB
    Inventors: Tom Kjelgaard, Anders Hallberg, Kenth Jacobsson
  • Patent number: 4711797
    Abstract: The invention relates to a material for packing containers comprising punched out blanks or a coherent web made up of a carrier layer of cardboard which on either side has a coating of thermoplastics. The carrier layer is reduced in thickness along selectively chosen regions in that parts of the carrier layer material are ground away and the regions of the blank or of the web which include the said thickness-reduced regions are folded over one another so as to form a so-called Z-fold wherein parts folded together are sealed to one another in order to form portions of rigid form, the total material thickness within the said ground portions of the Z-folded region A substantially corresponding to the thickness of the non-ground material.
    Type: Grant
    Filed: October 29, 1985
    Date of Patent: December 8, 1987
    Assignee: Tetra Pak International AB
    Inventor: Jorgen Niske