EP0030649B1 - Procédé pour la fabrication de couvercles en tôle pour récipients, notamment des boîtes - Google Patents

Procédé pour la fabrication de couvercles en tôle pour récipients, notamment des boîtes Download PDF

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Publication number
EP0030649B1
EP0030649B1 EP80107289A EP80107289A EP0030649B1 EP 0030649 B1 EP0030649 B1 EP 0030649B1 EP 80107289 A EP80107289 A EP 80107289A EP 80107289 A EP80107289 A EP 80107289A EP 0030649 B1 EP0030649 B1 EP 0030649B1
Authority
EP
European Patent Office
Prior art keywords
sheet metal
sheet
edges
punching
chromium
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
Application number
EP80107289A
Other languages
German (de)
English (en)
Other versions
EP0030649A2 (fr
EP0030649A3 (en
Inventor
Helmuth Supik
Hans-Jürgen Schlinsog
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.)
Ardagh Metal Packaging Germany GmbH
Original Assignee
Schmalback Lubeca AG
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 Schmalback Lubeca AG filed Critical Schmalback Lubeca AG
Priority to AT80107289T priority Critical patent/ATE7866T1/de
Publication of EP0030649A2 publication Critical patent/EP0030649A2/fr
Publication of EP0030649A3 publication Critical patent/EP0030649A3/de
Application granted granted Critical
Publication of EP0030649B1 publication Critical patent/EP0030649B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • B21D51/44—Making closures, e.g. caps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/06—Making more than one part out of the same blank; Scrapless working
    • 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
    • B65D17/50—Non-integral frangible members applied to, or inserted in, preformed openings, e.g. tearable strips or plastic plugs
    • B65D17/501—Flexible tape or foil-like material
    • B65D17/502—Flexible tape or foil-like material applied to the external part of the container wall only
    • 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
    • B65D2517/0013—Action for opening container pull-out tear panel, e.g. by means of a tear-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
    • B65D2517/0058—Other details of container end panel
    • B65D2517/0089—Unusual details
    • 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
    • B65D2517/0091—Means for venting upon initial opening
    • B65D2517/0094—Means for venting upon initial opening formed as a separate opening
    • 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
    • B65D2517/50—Non-integral frangible members applied to, or inserted in, a preformed opening
    • B65D2517/504—Details of preformed openings
    • B65D2517/5059—Details of preformed openings provided with a plurality of openings

Definitions

  • the invention relates to a method for producing lids from sheet metal for containers, in particular cans, in which lid blanks are punched out from a sheet-like or strip-shaped sheet, provided with a pouring area, preferably in the form of a plurality of punched-out openings which are close together, formed and provided with a a corrosion-preventing protective layer is provided, whereupon a flexible sealing strip is applied to the lid surface by gluing or heat sealing in order to hermetically seal the opening area.
  • Lids of the type on which the method is based are known, for example, from US-A-3292828 or DE-A1-2519 709. However, lids are also possible in which only a single removal and / or ventilation opening is punched into the lid.
  • This object is achieved in that after punching a hole pattern determining the pouring area, this is passed through an electrochemical cleaning bath, the current strength of which is maintained at a value sufficient to remove the punch burr while simultaneously chamfering or rounding off the edges of the openings on both surface sides of the sheet that the sheet then receives a tin or chrome layer.
  • the removal of the punch burr reliably prevents the formation of corrosion in the area of the opening edges.
  • the rounding of the opening edges in particular on the side opposite the punching ridge, facilitates the reliable and hermetic application of the flexible sealing strip and prevents the opening edge from cutting into the material of the sealing strip when the sealing strip is applied and extreme stress, thus weakening the sealing strip to an undesired extent.
  • a chrome-plated sheet metal coil is assumed, and after the electrochemical cleaning and deburring, as well as chamfering or rounding, only the punched edges are post-tinned or post-chrome-plated. This ensures a continuous manufacturing process in the context of mass production in a particularly efficient manner.
  • the cover 1 shown in plan view in FIG. 1 has in the cover mirror 5 a group of closely spaced openings 2 forming a hole pattern and at a distance from these two further openings 3.
  • the openings of the hole pattern 2 form the pouring area, while the openings 3 serve to ventilate the interior of the container during the pouring of the contents of the container.
  • the lid has a lid edge 6 in the usual way, which can be connected, for example, by folding to the edge of a container body.
  • a band-shaped tear-open element 4 for the hermetic sealing of both the pouring area and the ventilation opening, a band-shaped tear-open element 4, indicated only by dashed lines, made of flexible material is used, which is hermetically sealed by gluing or heat sealing sealingly connected to the surface of the cover mirror 5 and can be detached from the cover mirror by at least partial tearing up so far that the pre-punched openings are exposed.
  • the hole pattern can also consist of only a single removal or pouring opening and / or ventilation opening.
  • the lids are made from sheet or ribbon-shaped sheet metal.
  • the cover blanks can first be punched out of the sheet metal and then provided with the hole pattern and further processed.
  • the perforated pattern for the pouring area and for the ventilation openings is preferably punched into the sheet-like or strip-shaped material in such a distributed manner that in a later process step the lid blanks or intermediate products can be punched out in transverse strip strips from the material prepared in this way.
  • the starting material is aluminum sheet, but in particular iron or steel sheet of suitable and customary qualities for the production of lids.
  • the openings are created by punching from one top of the sheet. As shown in FIG. 2 on a larger scale, there is a relatively sharp edge 12 on the penetration side of the punching tool and a punching ridge 13 on the exit side of the opening 11, which protrudes considerably beyond the underside of the sheet.
  • a protective layer is applied to the sheet, the punching ridge is also covered by the protective layer. Due to the sharp edges of the ridge, a sufficiently thick formation of the protective layer is not possible in this area, so that there is always the risk that, in cooperation with the contents of the closed container, exposed or exposed areas of the iron or steel sheet with a progressively spreading point Corrosion begins, which changes the taste or the color of the filling or makes the filling inedible.
  • the opening edges 22 and 23 of the sheet 20 are deburred.
  • the edge 13 is removed according to Figure 2, but in this area and in the leading edge 22 of the opening 21, the edge itself is chamfered or rounded, so that there is a smooth area transition from the top of the sheet 2 to the peripheral wall of the opening 21 .
  • the preferred way to manufacture the lid of FIG. 1 with opening edges 22 and 23 of FIG. 3 is that the z. B. unwound from a coil sheet metal strip 30 moves according to arrow 31 in Figure 4 from left to right.
  • the raw sheet or black sheet is first provided with the opening pattern 33 responsible for the pouring area and ventilation by punching. This takes place in the punching station 32 indicated by the arrow.
  • the dashed circles 36 merely indicate the punching edge along which the sheet metal blanks for the covers are punched out of the sheet metal strip 30 at a later time. After punching the holes, the sheet metal strip 30 runs through a station 34, in which the sheet metal is cleaned electrochemically.
  • the setting of the electrochemical bath in connection with the dwell time is such that at the same time the ridge 13 as well as the sharp edge regions of the edges of the holes are removed analytically by the electrical current in order to form an edge corresponding to the edges 22, 23 of FIG. 3 to reach.
  • the sheet metal After leaving the cleaning station 34, the sheet metal passes through a coating station 35.
  • the sheet metal is preferably tinned or chromed.
  • the sheet treated in this way then passes into a separating station 37, in which either the individual sheet rounds 36 are punched out of the sheet or transverse sheet strips are cut off with a series of sheet rounds, which are then individually separated and treated further.
  • the deburring according to the invention is carried out by an increased current attack on the punched edges.
  • the current intensity parameter depends on the size of the punch burr to be removed, which is mechanically scanned and the values of which are entered in an electronic current control.
  • the sheet is coated with a protective lacquer, preferably in the roll coating process, the punched edges being covered by capillary action.
  • the cover profile is produced by stamping, at the same time the individual covers are punched out of the sheet metal or sheet strips running transversely to the coil are cut off with a series of cover blanks and then the individual covers are punched out.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Closures For Containers (AREA)
  • Laminated Bodies (AREA)

Claims (2)

1. Procédé pour fabriquer des couvercles en tôle pour récipients, en particulier pour boîtes de conserve, selon lequel on découpe à l'emporte- pièce, dans une tôle en forme de plaque ou de bande, des ébauches de couvercle dans lesquelles on réalise une zone verseuse, de préférence sous la forme de plusieurs ouvertures étroitement rapprochées et produites par poinçonnage et que l'on pourvoit d'une couche de protection anticorrosion, après quoi, pour fermer hermétiquement la région des ouvertures, on fixe une bande de fermeture flexible sur la face externe du couvercle par collage ou thermoscellage, caractérisé en ce qu'après le découpage par poinçonnage d'une série de trous (2, 3) déterminant la région des ouvertures dans la tôle (30), celle-ci est déplacée à travers un bain de nettoyage électrochimique, dont l'intensité du courant est maintenue à une valeur suffisante pour éliminer les bavures de poinçonnage (13) en biseautant ou en arrondissant simultanément les arêtes (22, 23) bordant les ouvertures (2, 3) sur les deux faces de la tôle (10) et en ce que la tôle (30) est ensuite pourvue d'une couche d'étain ou de chrome.
2. Procédé selon la revendication 1, caractérisé en ce qu'on part d'une bobine de tôle chromée et, après le nettoyage électrochimique et l'ébavurage, ainsi qu'après le biseautage ou l'arrondissement, seules les arêtes de poinçonnage subissent un post-étamage ou un post-chromage.
EP80107289A 1979-12-13 1980-11-22 Procédé pour la fabrication de couvercles en tôle pour récipients, notamment des boîtes Expired EP0030649B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80107289T ATE7866T1 (de) 1979-12-13 1980-11-22 Verfahren zum herstellen von deckeln aus blech fuer behaelter, insb. dosen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2950214A DE2950214C2 (de) 1979-12-13 1979-12-13 Verfahren zum kontinuierlichen Herstellen von Deckeln aus Blech für Dosen
DE2950214 1979-12-13

Publications (3)

Publication Number Publication Date
EP0030649A2 EP0030649A2 (fr) 1981-06-24
EP0030649A3 EP0030649A3 (en) 1981-12-23
EP0030649B1 true EP0030649B1 (fr) 1984-06-13

Family

ID=6088408

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80107289A Expired EP0030649B1 (fr) 1979-12-13 1980-11-22 Procédé pour la fabrication de couvercles en tôle pour récipients, notamment des boîtes

Country Status (5)

Country Link
US (1) US4309951A (fr)
EP (1) EP0030649B1 (fr)
AT (1) ATE7866T1 (fr)
CA (1) CA1159719A (fr)
DE (1) DE2950214C2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2168312B (en) * 1984-12-13 1989-05-17 Metal Box Plc Containers
US8549740B1 (en) * 2008-06-05 2013-10-08 Innosys, Inc Method of manufacturing a folded waveguide
DE102011086121A1 (de) * 2011-11-10 2013-05-16 Ball Packaging Europe Gmbh Stirnelement für Behälter
US20170013933A1 (en) * 2015-07-14 2017-01-19 Heba Designs, LLC dba GO-Comb Wallet-sized comb

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2122463A (en) * 1936-03-27 1938-07-05 Bell Telephone Labor Inc Method of enameling wire
US2382549A (en) * 1943-11-26 1945-08-14 Ncr Co Electrolytic smoothing of metals
US2479302A (en) * 1945-10-11 1949-08-16 Gen Electric Method of electropolishing laminated magnetic cores
US2725352A (en) * 1950-07-21 1955-11-29 Western Electric Co Methods of and apparatus for dissolving surface projections, electropolishing and passivating metallic tapes
US3281024A (en) * 1964-05-20 1966-10-25 Continental Can Co Easy opening container end and closure member therefor
US3292828A (en) * 1964-09-17 1966-12-20 Nat Can Corp Easy opening can end
US3380622A (en) * 1966-12-15 1968-04-30 Procter & Gamble Method and material for hermetically sealing containers
DE1765890B1 (de) * 1968-08-01 1972-03-09 Wendt Kg Fritz Verfahren zum Elysieren,insbesondere Entgraten von Werkstuecken ohne Vorschubbewegung zwischen Elektrode und Werkstueck
CA943479A (en) * 1968-08-05 1974-03-12 Continental Can Company Separable molded article
US3691654A (en) * 1969-05-29 1972-09-19 Gen Electric Metal foil lead manufacture
GB1361784A (en) * 1970-09-16 1974-07-30 Broken Hill Pty Co Ltd Push-in easy-opening closures
US3888199A (en) * 1973-12-03 1975-06-10 Coors Container Co Method of making a press tab container end from a metallic web
DE2519709B2 (de) * 1974-09-18 1979-07-12 The Continental Group, Inc., New York, N.Y. (V.St.A.) öffnungseinrichtung an einem Deckel, insbesondere aus Metall sowie Verfahren zu seiner Herstellung
US4106422A (en) * 1977-03-14 1978-08-15 Buhrke Industries, Inc. Method for manufacture of can end closures

Also Published As

Publication number Publication date
US4309951A (en) 1982-01-12
DE2950214A1 (de) 1981-06-19
EP0030649A2 (fr) 1981-06-24
CA1159719A (fr) 1984-01-03
DE2950214C2 (de) 1986-02-06
EP0030649A3 (en) 1981-12-23
ATE7866T1 (de) 1984-06-15

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