EP1182140A1 - Deckel für Lebensmittelbehälter - Google Patents

Deckel für Lebensmittelbehälter Download PDF

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Publication number
EP1182140A1
EP1182140A1 EP00301829A EP00301829A EP1182140A1 EP 1182140 A1 EP1182140 A1 EP 1182140A1 EP 00301829 A EP00301829 A EP 00301829A EP 00301829 A EP00301829 A EP 00301829A EP 1182140 A1 EP1182140 A1 EP 1182140A1
Authority
EP
European Patent Office
Prior art keywords
protective material
panel
score
deposits
end according
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.)
Withdrawn
Application number
EP00301829A
Other languages
English (en)
French (fr)
Inventor
designation of the inventor has not yet been filed The
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.)
Crown Packaging Technology Inc
Original Assignee
Crown Cork and Seal Technologies Corp
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 Crown Cork and Seal Technologies Corp filed Critical Crown Cork and Seal Technologies Corp
Priority to EP00301829A priority Critical patent/EP1182140A1/de
Publication of EP1182140A1 publication Critical patent/EP1182140A1/de
Withdrawn legal-status Critical Current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
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/401—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall
    • B65D17/4011—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall for opening completely by means of a tearing tab
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/0001—Details
    • B65D2517/001—Action for opening container
    • B65D2517/0016—Action for opening container pivot tab, push-down and pull-out tear panel
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/0001—Details
    • B65D2517/0058—Other details of container end panel
    • B65D2517/008—Materials of container end panel
    • B65D2517/0082—Coated or laminated metal
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/0001—Details
    • B65D2517/0058—Other details of container end panel
    • B65D2517/0089—Unusual details

Definitions

  • This invention relates to an easy open food can end having a protective material for providing safe edges when the end is opened.
  • a can end having a large aperture such as those commonly known in the trade as “full aperture” can ends.
  • Such can ends typically comprise can ends stamped from sheet metal and formed into a shape comprising a centre panel, chuck wall upstanding from the periphery of the centre panel and a flange extending laterally from the top of the chuck wall.
  • a line of weakness usually formed by scoring, extends around the centre panel near the chuck wall to define a removable panel.
  • a pull tab is fixed to an integral rivet raised from the metal of the centre panel.
  • the tab is raised to break or "pop" the score line and then pulled progressively to remove the removable panel by tearing the rest of the score line.
  • the can end may have a full aperture panel which corresponds to the end shape, usually circular or rectangular, or a partial aperture such as may be used as a pouring aperture for soups or other liquid/semi-liquid food products.
  • annuli of polymeric material bonded to either the removable panel or the remainder of the can end in order to mask the torn edges of the removable panel or the part of the can end which remains fixed to the can body itself.
  • annuli of polymeric material bonded to either the removable panel or the remainder of the can end in order to mask the torn edges of the removable panel or the part of the can end which remains fixed to the can body itself.
  • the use of an inwardly directed guard bead formed in the side wall of the can body to mask the remaining part of the can end after opening has also been proposed.
  • a food can end comprising: a centre panel; a peripheral score defining a removable panel portion of the centre panel; a remaining portion surrounding centre panel; and a tab positioned on the removable panel adjacent the score; and further comprising deposits of protective material on both sides of the end, in which the deposits are fixed to both the removable panel and the remaining portion but are displaced relative to the score in different directions on either surface of the end such that in use, when the end is opened, the deposit debonds from either the removable panel or from the remaining portion of the end, and a user is protected from injury by protective material preventing contact with both raw edges.
  • the protective material is selected from the group comprising polyamides, polyesters, rubber latex, SBR latex, silicone rubber and styrene acrylic.
  • the can end of this invention provide a safe edge to both the removable portion and the remainder of the end fixed to the can itself, but the materials selected to cover the raw edges are approved for use with food products and adhere to lacquers.
  • the protective material is selected from the group comprising polyester, SBR latex and styrene acrylic.
  • Polyester may be deposited readily by hot melt, in addition, or alternatively, it may be deposited in powder form.
  • SBR latex and styrene acrylic may be deposited by means of a nozzle or by a printing method with, optionally, a thickener, if necessary.
  • SBR latex and styrene acrylic are applied as aqueous dispersions (35 to 55% water) which react to form solid deposits during curing.
  • Water-based dispersions of protective material are curable at temperatures of about 100°C and within a few minutes.
  • a powdered polyester for example, requires a temperature in excess of 160°C in order to be flowed out in the same amount of time.
  • the protective material is deposited such that it remains adhered to the removable part of the centre panel around the majority of the top surface of the end and on the remaining portion, i.e. the annulus or rim, around the majority of the underside of the end.
  • the tab is raised away from the central panel to break the score over a distance up to a predetermined maximum length so that the protective material may remain adhered to the underside of the central panel and around the top of the annulus over that maximum length.
  • the protective material is preferably deposited as either a continuous line or as drops. Where the protective material is deposited as drops, the drops should be spaced apart by less than a characteristic radius through a section of a finger contacting the edge. Clearly from a safety point of view it is preferred that the deposits are contiguous since the characteristic radius varies according to the load applied by the finger and stretching of the skin as the load increases.
  • This situation is reversed for the rim where the curvature of the end is concave, i.e. the reverse of the panel.
  • a preferred maximum spacing is 2 mm.
  • a continuous deposit or contiguous droplets may be preferred from a safety aspect, there is a maximum limit on droplet/contact radius due to tear force constraint. This may also vary according to the material used for the deposits and whether such material penetrates or wets inside the score itself.
  • the protective material extends over and outboard of the score by less than the length of a horizontal portion outboard of the score, typically 0.5 mm.
  • the overhang could be the same inboard of the score, in practice it is preferred that the overhang is offset twards the panel or rim in order to ensure that the deposit debonds from the appropriate during opening.
  • a full aperture easy open end 1 comprises a centre panel 3 having a tab 5 with a nose 7 and a ring 9 fixed to the centre panel by a rivet.
  • the end also comprises a chuck wall and flange 11 around the periphery of the centre panel 3.
  • a circumferential score 13 on the centre panel defines a removable panel 15 which is shown in isolation in figures 2 and 3.
  • Discrete deposits 17 of protective material have been provided around the end, both above and below the score 13. As better seen in figures 2 and 3, these deposits 17 are provided around the major arc between points A-A on the top (tab side) of the removable panel 15 (figure 2) and around the minor arc A-A of the underside of the removable panel (figure 3).
  • deposits 17 shown in figure 1 adhere to both surfaces of the end, they are offset towards the removable panel around the major arc A-A and towards the periphery (rim) of the centre panel around the minor arc A-A. Conversely, on the underside of the end, deposits are offset towards the rim of the centre panel around the major arc A-A.
  • the deposits 17 are shown in the drawings as discrete elements approximately 1.5 mm in diameter and spaced approximately 0.5 mm apart. In practice, however, the shape, size and spacing may vary, provided that the spacing is not so great that a user may come into contact with the cut edge 19 of the panel (or that of the remainder of the end) with subsequent risk of injury. In addition, the deposits must extend sufficiently over the cut edges for adequate safety performance, whilst not contacting the reverse wall of a countersink as this would adversely influence debonding. In practice this means that the external deposit should not extend by more than 0.5 mm beyond the score for a 73 mm diameter end.
  • a continuous line of protective material may be provided between points A-A in the same manner as the discrete deposits, although this requires a greater quantity of material with associated costs and the overlap must be very small in order to overcome the high tear force.
  • the can end 1 is opened in the usual manner by raising tab 5 so that the nose 7 breaks the score 13.
  • the tab 5 is raised until the handle 9 overlies flange 11 and the score 13 "pops" (i.e. is broken), typically between points A-A in the embodiment shown.
  • the end shown in the drawings includes reinforcing ribs 21 which assist in controlling the opening of the end.
  • tear force requires a limit to be placed on the number and size of droplets, according to the material type.
  • the process of debonding is complex since it is a mixture of peel and shear and the stresses in the two parts of the material are unequal.
  • the score may increase of decrease the bond area, depending upon whether or not the deposit wets inside the score.
  • the limit on tear force increase due to the deposits of the present invention should not be more than 25%. It is possible to offset some of this increase by modifications in end design but any increase over 25% is not acceptable for openability.
  • Possible food grade protective materials must be capable of withstanding the sort of temperature involved in sterilisation processes and must adhere to the lacquer coating which is customarily applied to the can end. Clearly it would be unacceptable for deposits to become detached from the end and fall into the food product within the can, for example.
  • the method of application of the material may be dictated by the phase (liquid or solid), viscosity, and format in which the material is available.
  • polyamides polyamides
  • polyesters rubber latex
  • SBR latex silicone rubber
  • silicone rubber styrene acrylic
  • certain of these materials may require excessive temperatures and/or time for curing or may be prohibitively expensive.
  • Polyamide for example, is also not a preferred material due to its poor water resistance.
  • Another problem which the selected materials address is the ease (and associated cost) of application.
  • Alternative methods may depend on the type of material but include hot melt gun or a powder spray for polyester, or nozzle or printing application (with a thickener if necessary) for an aqueous dispersion of SBR latex or styrene acrylic. These three materials represent the preferred materials for use with the food can ends of the present invention.
  • Application of the two fluid materials can be carried out with a rotary indexing machine using either sequential deposition from one nozzle onto a spinning end or simultaneous deposition from multiple nozzles onto a stationary end.
  • the unoriented end is indexed into a permanently spinning chuck which then rises to place the spinning end beneath the application nozzle.
  • An optical sensor detects a printed mark on the seaming panel (to which the printing and tab are oriented) and a timing system for each nozzle is activated. Recognition of the mark occurs during a first revolution and deposition of the droplets starts within the second revolution. The chuck then drops. Two deposition stations are required, one for deposition on each side, with an inversion station between the two.
  • the end For simultaneous deposition, the end must be oriented on the machine before it is indexed into the deposition station since it is not spun in the station.
  • Two applicator heads are used, one for each surface, with no inversion required. These are located on the surfaces of the end and all droplets are delivered in one firing. The heads then move apart and the end is indexed to an exit station.
EP00301829A 2000-03-06 2000-03-06 Deckel für Lebensmittelbehälter Withdrawn EP1182140A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00301829A EP1182140A1 (de) 2000-03-06 2000-03-06 Deckel für Lebensmittelbehälter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP00301829A EP1182140A1 (de) 2000-03-06 2000-03-06 Deckel für Lebensmittelbehälter

Publications (1)

Publication Number Publication Date
EP1182140A1 true EP1182140A1 (de) 2002-02-27

Family

ID=8172771

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00301829A Withdrawn EP1182140A1 (de) 2000-03-06 2000-03-06 Deckel für Lebensmittelbehälter

Country Status (1)

Country Link
EP (1) EP1182140A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1577222A1 (de) * 2004-03-09 2005-09-21 Impress Group B.V. Dosendeckel
GB2562464A (en) * 2017-05-02 2018-11-21 Crown Packaging Technology Inc Easy open closure
EP3028952B1 (de) 2014-12-01 2020-02-12 Ardagh MP Group Netherlands B.V. Verschluss für einen Behälter und Behälter damit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765561A (en) * 1972-03-10 1973-10-16 Continental Can Co Easy opening container provided with opening edge protective hot melt adhesive band
US4016311A (en) * 1974-05-13 1977-04-05 Boise Cascade Corporation Method for protecting metal ends
EP0268690A1 (de) * 1986-06-13 1988-06-01 Toyo Seikan Kaisha Limited Leicht zu öffnender behälterdeckel mit geschütztem kerblinienrand und verfahren zur herstellung desselben
WO1996007593A1 (en) * 1994-09-10 1996-03-14 Carnaudmetalbox Plc Easy-open containers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765561A (en) * 1972-03-10 1973-10-16 Continental Can Co Easy opening container provided with opening edge protective hot melt adhesive band
US4016311A (en) * 1974-05-13 1977-04-05 Boise Cascade Corporation Method for protecting metal ends
EP0268690A1 (de) * 1986-06-13 1988-06-01 Toyo Seikan Kaisha Limited Leicht zu öffnender behälterdeckel mit geschütztem kerblinienrand und verfahren zur herstellung desselben
WO1996007593A1 (en) * 1994-09-10 1996-03-14 Carnaudmetalbox Plc Easy-open containers

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1577222A1 (de) * 2004-03-09 2005-09-21 Impress Group B.V. Dosendeckel
EP3028952B1 (de) 2014-12-01 2020-02-12 Ardagh MP Group Netherlands B.V. Verschluss für einen Behälter und Behälter damit
EP3028952B2 (de) † 2014-12-01 2024-01-31 Ardagh MP Group Netherlands B.V. Verschluss für einen Behälter und Behälter damit
GB2562464A (en) * 2017-05-02 2018-11-21 Crown Packaging Technology Inc Easy open closure
CN110582448A (zh) * 2017-05-02 2019-12-17 皇冠包装技术公司 易开闭合件
GB2562464B (en) * 2017-05-02 2020-01-08 Crown Packaging Technology Inc Easy open closure
CN110582448B (zh) * 2017-05-02 2021-04-06 皇冠包装技术公司 易开闭合件
EP3619124B1 (de) * 2017-05-02 2021-07-28 Crown Packaging Technology, Inc. Leicht zu öffnender verschluss
AU2018263600B2 (en) * 2017-05-02 2023-06-01 Crown Packaging Technology, Inc. Easy open closure

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