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WO2005051780A1 - Recipient pour aliment - Google Patents

Recipient pour aliment Download PDF

Info

Publication number
WO2005051780A1
WO2005051780A1 PCT/GB2004/004864 GB2004004864W WO2005051780A1 WO 2005051780 A1 WO2005051780 A1 WO 2005051780A1 GB 2004004864 W GB2004004864 W GB 2004004864W WO 2005051780 A1 WO2005051780 A1 WO 2005051780A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
blank
lid
container according
portions
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.)
Ceased
Application number
PCT/GB2004/004864
Other languages
English (en)
Inventor
Phillip Wright
Frank Mills
Neil Goldman
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.)
Colpac Ltd
Original Assignee
Colpac Ltd
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 Colpac Ltd filed Critical Colpac Ltd
Publication of WO2005051780A1 publication Critical patent/WO2005051780A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • B65D5/20—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-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form
    • B65D5/2038—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-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form at least two opposed folded-up portions having a non-rectangular shape
    • B65D5/2047—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-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form at least two opposed folded-up portions having a non-rectangular shape trapezoidal, e.g. to form a body with diverging side walls
    • 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
    • B65D5/20—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-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form
    • B65D5/28—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-up portions connected to a central panel from all sides to form a container body, e.g. of tray-like form with extensions of sides permanently secured to adjacent sides, with sides permanently secured together by adhesive strips, or with sides held in place solely by rigidity of material
    • 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
    • B65D5/64—Lids
    • B65D5/66—Hinged lids
    • B65D5/6626—Hinged lids formed by folding extensions of a side panel of a container body formed by erecting a "cross-like" blank
    • 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
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/30—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure
    • B65D85/36—Containers, packaging elements or packages, specially adapted for particular articles or materials for articles particularly sensitive to damage by shock or pressure for bakery products, e.g. biscuits

Definitions

  • This invention relates to a container for receiving a food product and in particular the invention is concerned with containers that can be formed by folding a shaped blank of paper, paperboard, cardboard or a similar material. (References in this specification to 'paperboard' are to be taken to include paper, cardboard and similar materials).
  • Containers for food products such as sandwiches tend to be manufactured from paperboard or from plastics.
  • Paperboard is generally preferred as it is recyclable and biodegradable, and regarded as more environmentally friendly than the plastics alternative.
  • WO 03018410 discloses various paperboard containers which are rendered substantially airtight by means of applying a barrier coating to the surface of the blank which forms the inner surface of the folded container, the container being closed off by a plastics film heat sealed thereto.
  • the coating also prevents grease or fat from the food permeating through the paperboard.
  • To secure the blank in the form of the container traditionally it may be either glued or heat treated.
  • glue is often undesirable in the food packaging field, as it can be messy and time consuming to apply, and is not suited to creating an airtight seal.
  • Known heat treatments for securing the blank include flame sealing, the application of hot air, direct application of heat by a heating element, or various other methods.
  • a problem associated with these methods is the production of intense heat which affects not only the parts of the container to be welded, as intended, but also the rest of the container. This can result in degradation or distortion of other components of the container, such as the thin plastics film window used to close the container and through which the food product can be viewed.
  • the present invention provides a container for receiving a food product and folded from a blank having a plurality of foldable portions for abutting one another when the blank is folded, the container comprising a main body defining an opening for receiving the food product and the surface of the blank having a coating which is susceptible to RF welding, abutting portions of the blank being sealed together by RF welding.
  • RF (radio frequency) welding is a known welding technique whereby RF (and/or microwave frequency) electromagnetic radiation is applied to a material, causing molecular oscillation with the consequent melt forming a weld.
  • the molecules need to be dipolar.
  • RF welding In RF welding, a precisely defined beam of radiation can be emitted upon the surface or point to be welded with little extraneous heat being produced.
  • the other components of the container are not affected thereby, and it is thus possible to weld the container with the plastics film already in place if so desired.
  • the container has an integral lid including a thin plastics film window which is sealed to the blank before it is folded to form the container.
  • the acrylic coating which may be on the outer surface of the container is not affected in the regions where no RF welding occurs.
  • the blank can be made of a recyclable composite material which would normally require the application of a variety of different adhesives or different sealing temperatures under conventional heat treatments.
  • the surfaces can be bonded together in a relatively simple manner. In cases where the food product is inserted into the main body of the container before the abutting portions are sealed together, RF welding can be used without damaging the food product.
  • RF welding can be used to weld acrylic materials.
  • the blank could be coated with acrylic only.
  • Acrylic coating is biodegradable, thereby making the main body of the container compostible and biodegradable, and it is further possible to use a biodegradable plastics film window resulting in a container that is entirely biodegradable.
  • the high intensity electromagnetic field associated with the RF welder can be applied to the abutting portions by using electrodes pressed against the inner and outer surfaces of the abutting portions.
  • the present invention also provides a method of forming a container for receiving a food product from a blank having a plurality of foldable portions for abutting one another, the container comprising a main body defining an opening for receiving the food product, and the blank having a coating susceptible to RF welding, wherein the foldable portions are brought into abutment with one another and RF electromagnetic radiation is applied to the abutting portions thereby sealing them together.
  • the edges of the foldable portions in the region of the opening lie in substantially the same plane as the plane of the opening along at least part of the length of the edges.
  • the part of the edges of the foldable portions that lie in the same plane as the opening may be a majority of the length of the edges or the entirety of the length.
  • the edges of the foldable portions of the blank are configured to lie at an angle of about 10° to the plane of the opening to enable the foldable portions to be sealed together; if the edges lay in the same plane as the opening it would be difficult to obtain an effective seal right to the edge of foldable portion. This issue is circumvented by the use of RF welding as an effective seal can be obtained with foldable portion running to the edge of the container and this improves the integrity of the container.
  • a radiused cut is provide in the region of the intersection between flap edges of the container and flange-forming portions. Further, the radiused cut is offset from the crease line. This feature further improves the integrity (air tightness) of the main body to increase the shelf life of the food product.
  • the integrity of the container is improved by each of the features referred to above, whether they are utilised collectively or individually, and they allow the container to be gas-flushed in increase the shelf life of the food product still further.
  • the main body of the container could also be used as part of a "hybrid" product where a different material is used to form the lid of the product.
  • the container could be used to hold, say, margarine, and the lid could be formed from a conventional plastics material.
  • the "hybrid" pack would retain the appearance and feel of the conventional pack but the majority of the pack would be entirely recyclable.
  • Figure 1 is a plan view of a container blank according to an aspect of the invention.
  • Figure 2 is a first perspective view of a blanlc partially assembled into a container
  • Figure 3 is a second perspective view of a blank partially assembled into a container
  • Figure 4 is a perspective view of a container according to an aspect of the invention.
  • Figure 5 is a perspective view of a second container embodying the invention.
  • Figure 6 is an enlarged view of a preferred embodiment of portion of the blank shown in Figure 1;
  • Figure 7 is a partial perspective view of a preferred embodiment and of the container shown in Figure 4.
  • the container blank shown in Figure 1 may consist of paper, paperboard, cardboard or a similar material.
  • the surface of the blank that is used to form the inner surface of the container is coated with a coating susceptible to RF welding. Generally, plastics materials are most ideal for RF welding. In one embodiment the coating is of polyethylene. Acrylic coatings can also be used.
  • the surface of the blank forming the outer surface of the container is coated with a water based acrylic emulsion.
  • the blank includes a generally rectangular central portion 1 also referred to as rear portion 1, with a minor pair of parallel sides 2 defined by fold lines and a major pair of parallel sides 3 also defined by fold lines.
  • side panels of essentially identical shape and attached to the rear panel along fold lines 3 are end panels 5, also of substantially identical shape.
  • the outermost edges of the side and edge panels are defined by fold lines 6 and, as can be clearly seen from Figure 4, the outermost edges of the side and end panels 6 are arranged to lie in a common plane and thus define a uniplanar opening to the main body of the container, generally designated 7.
  • Fold lines 8 delineate tabs or flaps 10 which extend along the length of the end panels 5.
  • the flaps 10 are contiguous with the side panels 4 in the region of the rear portion 1, and cuts 9 separate the flaps from the side panels 4 in this area.
  • the cuts 9 extend up to, but not through the folding lines 2 and 8 in the region of the rear portion 1.
  • Elongate rectangular flange-forming flaps 11 are integral with the side and end panels 4,5.
  • the flange-forming flaps 11 are delineated from the side and end panels 4,5 by the fold lines 6.
  • fold lines 8 extend in the form of fold lines 12 onto the flange-forming portions to define substantially square end areas 13 of the flange-forming flaps 11.
  • the flange-forming flaps 11 extend at each end beyond the extremity of the side panels 4.
  • the extended sections of the flange-forming flaps 11 are substantially identical in size and shape to the square end areas 13 of the adjacent flange-forming flaps.
  • the blank is assembled such that the flaps 10 lie internally of the side panels 4.
  • the square end areas 13 of the flange-forming flaps 11 associated with the end panels 5 overlie the extended end portions of the flange-forming flaps associated with the side panels 4, and the container is sealed in the configuration shown in Figure 4 by RF welding of the abutting portions including flaps 10, side panels 4, square end areas 13 and the flange-forming flaps 11.
  • the RF weld can be applied in a linear fashion to form a straight weld represented in Fig. 4 by lines 14.
  • Other configurations of weld can be used, e.g. spot welds.
  • the welds 14 can be made by applying electrodes (not shown) to either side of the abutting portions 4, 10 although any arrangement of RF welding apparatus sensible to the skilled person can be used.
  • An RF electrical signal is applied to the electrodes to produce the necessary radiation to melt the coating on the surface of the blank forming the inner surface of the container.
  • a typical frequency used in RF welding is 27.12 MHz.
  • the coating does not have to be provided over the whole of the abovementioned surface of the blank, for the purpose of RF welding, which requires merely that there is some coating sandwiched between the abutting portions 4, 10, 11, 13.
  • RF welding can also be applied in the shaded regions 16 of overlap between the square end areas 13 and the flange-forming flaps 11, although it is not essential to the airtight sealing of this configuration of container.
  • the front or upper surface of the flange defined by the flange-forming flaps 11 presents a barrier coated surface.
  • a film of plastics can be heat sealed to the presented surface of the flange to provide, with the main body, a substantially airtight compartment for the food product.
  • the plastics film can also be RF welded to the container and is preferably clear to allow the contents of the container to be inspected by the consumer. Due to the comparative coldness and localised effect of the RF weld, it is possible to seal the plastics film to the flaps 11 before sealing of the paperboard abutting portions takes place, without causing damage to the plastics film. It is of course, also possible to seal the plastics film to the flaps 11 after sealing of the abutting portions.
  • Fig. 5 shows an alternative construction of container, embodying the present invention, in which a lid 17 is formed integrally with the main body 7 of the container.
  • a thin plastics window 18 is provided which can be sealed to the lid before or after folding of the blank to form the container although it is generally preferable to seal the plastics window 18 to the lid 17 before doing so.
  • Conventional heat treatment of the main body subsequently in order to seal the paperboard surfaces e.g. using male and female heating members involves bringing the heating members into close proximity with the window 18 and great care is thus needed to avoid damaging the window.
  • the window 18 is substantially unaffected.
  • Figures 6 and 7 show features that may be used independently or in combination in a preferred embodiment of the invention.
  • a radiused cut 15 is provided at the intersection of the flap 10 and the end area 13 of the flange forming flap 11.
  • the radiused cut is set away from the fold lines 8 and 12 by a small distance such that it does not interfere with the folding of the blank in this region.
  • a modified flap 10a has an outermost edge 19 that is configured to lie substantially in the same plane as the common plane that defines the opening to the main body of the container along at least a part of its length.
  • the invention is not restricted to the configuration of the containers described herein, which could take any form sensible to the skilled person and which are suitable for the application of RF welding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cartons (AREA)

Abstract

L'invention concerne un récipient (7) destiné à recevoir un produit alimentaire et constitué d'une découpe formée de papier, de carton ou de matière similaire. Ce récipient est formé au moyen d'un soudage à haute fréquence afin d'éliminer l'utilisation de colle, ce qui débouche sur un processus pour cuisson, plus rapide, économique et hygiénique utilisé dans l'assemblage du récipient.
PCT/GB2004/004864 2003-11-19 2004-11-18 Recipient pour aliment Ceased WO2005051780A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0326935A GB0326935D0 (en) 2003-11-19 2003-11-19 A container for food
GB0326935.4 2003-11-19

Publications (1)

Publication Number Publication Date
WO2005051780A1 true WO2005051780A1 (fr) 2005-06-09

Family

ID=29764081

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2004/004864 Ceased WO2005051780A1 (fr) 2003-11-19 2004-11-18 Recipient pour aliment

Country Status (2)

Country Link
GB (1) GB0326935D0 (fr)
WO (1) WO2005051780A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2428234B (en) * 2005-07-13 2007-12-27 St Neots Packaging Ltd Snack food container
US8002170B2 (en) 2008-07-25 2011-08-23 Sonoco Development, Inc. Dual-ovenable container formed of a paper-based laminate
WO2012080708A1 (fr) * 2010-12-17 2012-06-21 Colpac Limited Réceptacle et ébauche
US9718576B2 (en) 2011-12-29 2017-08-01 Colpac Limited Container and blank
SE2230408A1 (en) * 2022-12-12 2024-06-13 Stora Enso Oyj A tray and a method for forming a tray
US12378058B2 (en) 2015-11-25 2025-08-05 Yeti Coolers, Llc US CIP: insulating container having vacuum insulated panels and method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4332490A1 (de) * 1993-09-24 1995-06-08 Eugen Zipperle Gmbh & Co Kg Sp Verfahren zur Herstellung einer Hochfrequenzschweißverbindung zwischen Umhüllungsmaterial und zu umhüllendem Körper sowie ein nach diesem Verfahren umhülltes Produkt
GB2321236A (en) * 1997-01-15 1998-07-22 Colpac Limited Cartons
US20020162764A1 (en) * 2001-05-03 2002-11-07 Drew Sherline Printed-thermoplastic tamper-resistant package
WO2003018410A1 (fr) * 2001-08-24 2003-03-06 Colpac Limited Contenant pour produit alimentaire

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4332490A1 (de) * 1993-09-24 1995-06-08 Eugen Zipperle Gmbh & Co Kg Sp Verfahren zur Herstellung einer Hochfrequenzschweißverbindung zwischen Umhüllungsmaterial und zu umhüllendem Körper sowie ein nach diesem Verfahren umhülltes Produkt
GB2321236A (en) * 1997-01-15 1998-07-22 Colpac Limited Cartons
US20020162764A1 (en) * 2001-05-03 2002-11-07 Drew Sherline Printed-thermoplastic tamper-resistant package
WO2003018410A1 (fr) * 2001-08-24 2003-03-06 Colpac Limited Contenant pour produit alimentaire

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2428234B (en) * 2005-07-13 2007-12-27 St Neots Packaging Ltd Snack food container
US8002170B2 (en) 2008-07-25 2011-08-23 Sonoco Development, Inc. Dual-ovenable container formed of a paper-based laminate
WO2012080708A1 (fr) * 2010-12-17 2012-06-21 Colpac Limited Réceptacle et ébauche
CN103402879A (zh) * 2010-12-17 2013-11-20 科派克有限公司 容器和坯件
JP2014503432A (ja) * 2010-12-17 2014-02-13 コルパック リミテッド 容器およびブランク
US9505518B2 (en) 2010-12-17 2016-11-29 Colpac Limited Container and blank
CN103402879B (zh) * 2010-12-17 2019-07-05 科派克有限公司 容器和坯件
US9718576B2 (en) 2011-12-29 2017-08-01 Colpac Limited Container and blank
US12378058B2 (en) 2015-11-25 2025-08-05 Yeti Coolers, Llc US CIP: insulating container having vacuum insulated panels and method
SE2230408A1 (en) * 2022-12-12 2024-06-13 Stora Enso Oyj A tray and a method for forming a tray
WO2024127211A1 (fr) * 2022-12-12 2024-06-20 Stora Enso Oyj Plateau et procédé de formation d'un plateau

Also Published As

Publication number Publication date
GB0326935D0 (en) 2003-12-24

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