WO2018055099A1 - Languette pour extrémités de récipient, son procédé de production et son utilisation - Google Patents

Languette pour extrémités de récipient, son procédé de production et son utilisation Download PDF

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Publication number
WO2018055099A1
WO2018055099A1 PCT/EP2017/074077 EP2017074077W WO2018055099A1 WO 2018055099 A1 WO2018055099 A1 WO 2018055099A1 EP 2017074077 W EP2017074077 W EP 2017074077W WO 2018055099 A1 WO2018055099 A1 WO 2018055099A1
Authority
WO
WIPO (PCT)
Prior art keywords
zinc
layer
tab
rich primer
tabstock
Prior art date
Application number
PCT/EP2017/074077
Other languages
English (en)
Inventor
Arnoud Cornelis Adriaan DE VOOYS
Dammes Hans Van Der Weijde
Original Assignee
Tata Steel Ijmuiden B.V.
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 Tata Steel Ijmuiden B.V. filed Critical Tata Steel Ijmuiden B.V.
Publication of WO2018055099A1 publication Critical patent/WO2018055099A1/fr

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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
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/42—Applications of coated or impregnated materials
    • 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
    • B65D17/4012—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 partially 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
    • B65D2517/0014—Action for opening container pivot tab and push-down 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
    • B65D2517/50—Non-integral frangible members applied to, or inserted in, a preformed opening
    • B65D2517/5072—Details of hand grip, tear- or lift-tab
    • B65D2517/5091—Unusual details

Definitions

  • the present invention relates to an opening tab for container ends produced from tabstock provided with a coating layer.
  • the invention particularly relates to opening tabs for retained tab beer and beverage container ends and for easy open ends for foodstuffs.
  • Foodstuffs may be for consumption by humans or animals (e.g. pet food).
  • Pull tabs for container ends are used on various types of containers, including beer and beverage containers, food containers, and many other types of containers for household or industrial use.
  • the most prevalent type of pull-tab container ends is the retained-tab end, which have a tab designed to remain on the container end after the container is opened, such as with beer and beverage metal containers. See figure 3 for a specific example of the use of a tab on a beverage container.
  • the typical non-detachable tabs used in the beverage container industry all are of generally the same design (see e.g. W09926741-A1). These tabs have a nose portion, a lift end portion, separated by a central body portion that has an aperture provided for securing the tab to the end by a rivet.
  • the tab is manufactured separately from the end, and is secured to the end such that the nose is positioned over the score line of the end .
  • the rivet therefore, acts as a fulcrum for the rotation of the tab, and a central hinge area of the tab bends adjacent the rivet across a hinge line of the tab.
  • Containers are designed to provide liquids or food to consumers without spoilage, which requires any bacteria or other microbiological species to be eliminated.
  • the latter is done by a heat treatment of the containers after the lid, including the tab, has been placed in an airtight manner.
  • the heat treatment is referred to as sterilising or pasteurising, depending on the time-temperature cycle used, and is usually done in hot water and/or steam.
  • One of the prime criteria of tabstock is therefore the ability to withstand the heat treatment and subsequent storage without any visual or other undesirable change, like the formation of red rust.
  • tabstock The material from which the tab is produced (aka tabstock) is generally a steel strip or a steel sheet. Steel has a tendency to corrode when it is not protected, and therefore tabstock is usually provided with a tin layer or an electrolytically deposited zinc (electro-zinc (EZ)) layer. In addition, the tabstock may be provided with a lacquer. After the forming of the score line the coating may be locally damaged, and a score repair treatment, usually involving the application of a lacquer, may be performed .
  • Electrolytically depositing zinc layers do provide galvanic corrosion, and therefore suppress the formation of red rust, but the visual appearance is of a lower quality (it is darker and more dull) and is an expensive process requiring a dedicated EZ-line.
  • a tab for container ends produced from unplated steel strip or sheet tabstock or from plated steel strip or sheet tabstock, characterized in that the tabstock is coated with a layer of a zinc-rich primer.
  • This embodiment provides the steel with the necessary protection against corrosion during its most critical process step (the heat treatment of the canned product) and thereafter during its shelf-life.
  • the protection offered by the zinc-rich primer to a steel substrate is cathodic protection.
  • the zinc is anodic, and the steel is cathodic.
  • the polarity of a zinc- steel galvanic couple may reverse under certain conditions, which means that the steel becomes the anode, and the zinc becomes the cathode.
  • the change in the zinc electrode potential is chiefly responsible for the reversal of polarity since the potential of the steel remains relatively unchanged .
  • Figure 4 shows that polarity reversal does not occur in distilled water between 50 and 60 °C (the solution contains 70-80 ppm HC0 3 " , 10 ppm S0 4 2" and 10 ppm N0 3 " ( Figure 7.15 from Corrosion and Electrochemistry of Zinc, Zhang, Plenum Press, New York 1996)).
  • temperature such as dissolved ions, pH, and time of immersion, are found to affect the polarity of a zinc/steel couple.
  • the zinc is anodic to the steel and thus provides sacrificial protection for the steel.
  • the phenomenon of polarity reversal does not occur in the known applications of zinc-rich primer such as automotive applications, construction and industrial applications, because the temperature does not generally exceed the threshold temperature while being immersed in a solution.
  • the tabs for container ends are generally being subjected to a high temperature treatment for food conservation, such as sterilisation in water in an autoclave.
  • the food product in the container must then reach a temperature of 110 to 121 °C, depending on the food product, and the processing times to reach these maximum temperatures in the product are in the order of hours, depending on the container size and shape.
  • the sterilisation is performed in an autoclave in water.
  • the high pressure in the autoclave allows the water to be heated above 100 °C.
  • the temperature of the tab is therefore far above the temperature for polarity reversal, and normally corrosion of the cut edge or at a scratch would occur. So from this point of view the skilled person would not consider zinc-rich primer coatings as suitable for application as tabstock.
  • FR2249141 discloses a zinc powder primer system for use on a metal which has been preliminarily treated by phosphating or chromating.
  • the zinc powder primer system comprises a two layer system consisting of a lower layer (a) and an upper layer (b).
  • the lower layer (a) consists of a zinc powder primer having a zinc content of 80 to 95 wt.% zinc and a thickness of 10 to 20 ⁇ , and an upper layer (b) of 2 to 5 ⁇ consisting of a 30-50 wt.% of an organic binder and 70-50% of a lubricant selected from the group consisting of oil, silicone oil, wax, fat, graphite, molybdenum sulphide and other heavy metal sulphides.
  • the use of the system without layer (b) is not possible because this led to flaking off during forming of the steel substrate and contamination of the forming tools.
  • the process to apply this system involves phosphating or chromating the substrate, applying layer (a) and drying at 240 to 260 °C, cooling to 20-25 °C, applying layer (b) and drying at 240 °C.
  • the use of the lubricant would also render the product unsuitable in view of food safety.
  • the absence of corrosion at the cut edge means that the zinc-rich primer coating layer effectively protects the cut edge during the sterilisation treatment, and that no additional lacquering treatment is needed.
  • primer is used in the context of this invention to denote a coating layer, but it should be stressed that it may, or may not be, the first layer on a steel strip or sheet.
  • primer is also used if the layer is coated onto a steel strip or sheet that is already provided with a plating layer of a different kind, such as a tin layer.
  • the plated steel, prior to and/or after plating, or the blackplate may have been pre-treated, prior to coating with the zinc-rich primer. This pre-treatment may form instance be a passivation treatment in case of tinplate.
  • the steel strip can be cut into sheets, and that tabs may be produced from steel strip, or from steel sheet, depending on the equipment available at the tab-makers.
  • the zinc-rich primer may be applied to the steel strip before cutting the strip into sheets, or after cutting the strip into sheets.
  • the layer of a zinc-rich primer is further coated by a lacquer.
  • this lacquer layer provides additional protection to the layer of zinc-rich primer, and to the sides of the tab which may not be provided with the zinc-rich primer.
  • the lacquer may be applied to the steel strip before cutting the strip into sheets, or after cutting the strip into sheets, or even after forming the tabs.
  • the layer of a zinc-rich primer comprises between 4 and 1350 mg/dm 2 of zinc. The protection by the layer takes effect already at 4 mg/dm 2 of zinc. At a lower level than 4 mg/dm 2 the protection was insufficient.
  • Values of over 1350 mg/dm 2 do not contribute further to the protection.
  • a suitable minimum value is 10 mg/dm 2 of zinc.
  • a suitable maximum is 1200 mg/dm 2 of zinc, a more suitable maximum is 1000 mg/dm 2 of zinc and an even more suitable maximum is 800 mg/dm 2 of zinc.
  • the unplated tabstock i.e. the steel strip or sheet
  • the unplated tabstock is blackplate.
  • a blackplate strip or sheet is still uncoated and is therefore unprotected against corrosion.
  • the application of the layer of a zinc-rich primer provides the steel with the required protection.
  • the tabstock is coated with a layer of a zinc-rich primer on both sides of the blackplate sheet or strip. It should be noted that the coating thickness and/or the amount of zinc does not necessarily have to be the same on both sides, and can be optimised from a cost and/or corrosion protection perspective.
  • the tabstock is plated before providing it with a layer of zinc-rich primer, and preferably the plated tabstock is tinplate, reflown tinplate, ECCS, or blackplate with a chrome/chrome oxide layer.
  • Tinplate is a thin sheet or strip of soft steel, coated electrolytically on both sides with a tin-layer.
  • the tin layer may be different in thickness on both sides. In some cases the tin layer is melted after application and after solidification this is called reflown tinplate.
  • Chromium coated steel is a sheet or strip of steel electrolytically coated with a layer of chrome, usually thinner than a micron. This was originally called TFS (Tin Free Steel), but it is better known by the acronym ECCS (Electrolytic Chromium Coated Steel).
  • ECCS Electrolytic Chromium Coated Steel
  • ECCS is produced using hexavalent chromium plating baths, which are considered harmful and will eventually be banned. Recent developments have been made to avoid these baths and it is now possible to provide blackplate (or tinplate) with a chrome/chrome oxide layer from harmless trivalent chromium plating baths as described in WO2014202316.
  • the layer of a zinc-rich primer is between 0.2 and 20 ⁇ in thickness.
  • the minimum thickness of the layer is 0.2 ⁇ , and the maximum is 20 ⁇ .
  • a thinner layer is unlikely to provide the desired full protection, whereas a thicker layer adds additional costs without adding additional benefits.
  • a suitable maximum value is 15 ⁇ and a more suitable maximum is 10 ⁇ .
  • An even more suitable maximum value is 7.5 ⁇ .
  • a suitable minimum value is 0.25 ⁇ , a more suitable minimum is 0.3 ⁇ , and an even more suitable value is 0.35 ⁇ .
  • the amount of zinc in the zinc-rich primer determines the degree of galvanic protection offered by the layer of zinc-rich primer.
  • the inventors found that a limited degree of protection is already provided at by a layer of zinc-rich primer with a zinc content of 5 vol.%, but that there is a strong increase in protection when the layer of zinc-rich primer contains at least 30 vol.% of zinc. At this moment the strength of the galvanic protection is increased considerably as a result of the connectivity of the zinc particles with each other and the steel strip or sheet tabstock.
  • the layer of a zinc-rich primer comprises 30 to 95 vol.% of zinc. After curing the zinc-rich primer consists of zinc particles embedded in a matrix. It is important that the zinc is in electrical contact with the substrate.
  • tabstock is produced by producing a cold-rolled and recrystallisation annealed steel strip or sheet, or a recovery annealed steel strip or sheet, or a double reduced steel strip, or a recovery annealed double reduced steel strip or sheet, said strip or sheet having a thickness between 0.1 and 0.5 mm, wherein :
  • a layer of a zinc-rich primer is applied onto at least one side of the strip or sheet, eventually followed by forming the tab from the tabstock, or wherein
  • a layer of a zinc-rich primer is applied onto at least one side of the plated strip or plated sheet, eventually followed by forming the tab from the tabstock.
  • the steels used for producing tabs are usually of the high strength variety, or have received additional strengthening by using it in its recovered state rather than in a recrystallised state.
  • the method according to the invention can be used on any steel that are suitable to produce tabs from.
  • the zinc-rich primer coating layer may be applied in a conventional coil coating line wherein the zinc-rich primer is applied, preferably at temperatures below 50 °C, and more preferably at room temperature, and wherein a curing or drying oven may be used if necessary to accelerate or promote the drying or curing process.
  • the layer of a zinc-rich primer is applied from a one component system.
  • This is a relatively simple solution resulting but the functionality of the layer can be improved by using a two- or multi-component system.
  • the processing of these latter types is usually more complicated and required good process control in the preparation of the primer.
  • the layer of a zinc-rich primer is applied by means of one of the following application methods: spraying, coil-coating or roll-coating. These methods are suitable for the application of the layer.
  • the layer of a zinc-rich primer is applied in-line with the plating of the tabstock, preferably immediately following the plating.
  • the steel strip or sheet is provided with the layer of a zinc-rich primer at a running speed of the strip of higher than 9 metres per minute, preferably a speed higher than 15 metres per minute, more preferably having a speed higher than 30 metres per minute.
  • the invention is also embodied in the use of a tab according to the invention from the steel strip provided with a layer of a zinc- rich primer according to the invention for opening tabs for container ends for beer and beverage container ends or for easy open ends for foodstuffs, or for an opening tab for container ends for beer and beverage container ends or for easy open ends for foodstuffs, which will be pasteurised or sterilised during its lifecycle.
  • the strip or sheet having a thickness between 0.11 and 0.29 mm.
  • the steel substrate used in the experiments is a high-nitrogen low carbon steel.
  • the steel substrate is produced in a conventional way by casting a slab or strip with a suitable composition, hot-rolling and cold- rolling the material to a cold-rolled thickness, followed by annealing to recrystallise the steel strip. After annealing the strip was temper rolled with a deformation of between 5 to 10%. This steel would be referred to as double reduced steel.
  • the temper rolling is the second reduction
  • the first reduction is the reduction in the cold-rolling mill of the hot rolled strip thickness to a cold rolled thickness of around 0.20-0.50 mm.
  • the temper rolling reduction may be considerably higher than 10%, in which case it is usually not referred to anymore as temper rolling, but rather a second cold-rolling reduction, although in relation to this invention there is no principal difference between the two beside the degree of reduction.
  • the examples were prepared using uncoated material (referred to as blackplate), tinplate or reflown tinplate (in which case a tin layer is applied to produce tinplate, which layer is then melted (reflown) to change its appearance and properties).
  • the blackplate can also be provided with a thin layer of chromium provided with an even thinner layer of chromium oxide (ECCS) deposited from a hexavalent chromium bath, or with a layer of chromium-chromium oxide- chromium carbide deposited from a trivalent chromium bath (see WO2014202316).
  • ECCS chromium oxide
  • the thickness of the strip was 0.2 mm in all cases. From this substrate the following products were produced and used in the experiments:
  • the samples were subsequently formed in a proprietary Wedge bend test as described in ⁇ 9.3 of "Canmaking. The technology of metal protection and decoration" by T.A. Turner, Blackie Academic & Professional (1 st ed. 1998).
  • the surface was not prepared in any way.
  • the beakers were placed in a Tuttnauer 3850 ELV autoclave and sterilised for 60 minutes at 121 °C.
  • the lid was opened and the samples were left in the beakers until the water cooled to 40 °C, which took longer than half an hour. This procedure causes residual steam to condense on the parts above the water level, and the cooling rate was relatively low.
  • Tables 1-3 All substrates were tested with and without a layer of the zinc-rich primer (ZRP).
  • the zinc coating is in electrical contact with the substrate. So the minimum zinc content of the zinc rich primer is the value at which the zinc-rich primer starts to short-circuit all local cell activity on steel. The thicker the layer of zinc-rich primer, the longer the duration of protection, and the longer the shelf life. However, the most corrosive conditions are experienced for only a limited time (the sterilisation period), so a limited layer thickness will provide adequate shelf life under most circumstances. For tabs the thickness of the layer of 0.2 to 20 ⁇ was found to be sufficient.
  • coatings and the coating method can also be used for strip having a composition different from that used for the above experiments.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

L'invention concerne une languette pour des extrémités de récipient produite à partir d'une bande d'acier qui n'est pas en plaque ou d'une bande pour languette en feuille ou à partir d'une bande d'acier en plaque ou d'une bande pour languette en feuille, la languette étant pourvue d'une couche d'une amorce riche en zinc, et un procédé de production de la languette, et l'utilisation de celle-ci.
PCT/EP2017/074077 2016-09-22 2017-09-22 Languette pour extrémités de récipient, son procédé de production et son utilisation WO2018055099A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16190195 2016-09-22
EP16190195.4 2016-09-22

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WO2018055099A1 true WO2018055099A1 (fr) 2018-03-29

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2249141A1 (fr) 1973-10-26 1975-05-23 Bonaval Werke Gmbh
FR2452327A1 (fr) * 1979-03-29 1980-10-24 Cauwenberghe Helic Van Procede d'application d'un revetement anticorrosif sur des objets metalliques, notamment sur des bouteilles de gaz liquefie
FR2575540A1 (fr) * 1984-12-27 1986-07-04 Schneider Ind Si Revetement de protection externe de bouteilles a gaz
EP0278283A1 (fr) * 1987-02-06 1988-08-17 Metal Coatings International Inc. Composition de revêtement durcissant à basse température contenant du chrome
WO1999026741A1 (fr) 1997-11-26 1999-06-03 American National Can Company Languette pour couvercle de contenant et procede de fabrication
WO2009138471A1 (fr) * 2008-05-14 2009-11-19 Dow Corning Corporation Procédé pour la réduction du frottement
WO2014202316A1 (fr) 2013-06-20 2014-12-24 Tata Steel Ijmuiden B.V. Procédé permettant de fabriquer des substrats recouverts de chrome-d'oxyde de chrome

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2249141A1 (fr) 1973-10-26 1975-05-23 Bonaval Werke Gmbh
FR2452327A1 (fr) * 1979-03-29 1980-10-24 Cauwenberghe Helic Van Procede d'application d'un revetement anticorrosif sur des objets metalliques, notamment sur des bouteilles de gaz liquefie
FR2575540A1 (fr) * 1984-12-27 1986-07-04 Schneider Ind Si Revetement de protection externe de bouteilles a gaz
EP0278283A1 (fr) * 1987-02-06 1988-08-17 Metal Coatings International Inc. Composition de revêtement durcissant à basse température contenant du chrome
WO1999026741A1 (fr) 1997-11-26 1999-06-03 American National Can Company Languette pour couvercle de contenant et procede de fabrication
WO2009138471A1 (fr) * 2008-05-14 2009-11-19 Dow Corning Corporation Procédé pour la réduction du frottement
WO2014202316A1 (fr) 2013-06-20 2014-12-24 Tata Steel Ijmuiden B.V. Procédé permettant de fabriquer des substrats recouverts de chrome-d'oxyde de chrome

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
T.A. TURNER: "Blackie Academic & Professional", 1998
ZHANG: "Corrosion and Electrochemistry of Zinc", 1996, PLENUM PRESS

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