EP1218248B1 - Dispositif d'ouverture d'un contenant a languette de prehension gravée au laser et son procédé de fabrication - Google Patents
Dispositif d'ouverture d'un contenant a languette de prehension gravée au laser et son procédé de fabrication Download PDFInfo
- Publication number
- EP1218248B1 EP1218248B1 EP01914869A EP01914869A EP1218248B1 EP 1218248 B1 EP1218248 B1 EP 1218248B1 EP 01914869 A EP01914869 A EP 01914869A EP 01914869 A EP01914869 A EP 01914869A EP 1218248 B1 EP1218248 B1 EP 1218248B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- laser
- pull tab
- substrate
- tab
- opening device
- 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 - Lifetime
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Classifications
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/24—Ablative recording, e.g. by burning marks; Spark recording
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- 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
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- 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
- B65D2517/0047—Provided with additional elements other than for closing the opening
- B65D2517/0052—Prizes, tokens, badges or other information carrying devices
Definitions
- the present application relates to container opening devices and methods of making the same. More particularly, the present invention relates to laser-etched pull tabs and methods of making the same.
- Pull tab container opening devices have not been utilized by the food and beverage industry for package enhancement, brand identification, promotional, or informational purposes. Most existing pull tab designs only serve the function of allowing a user to open the container. In recent years, the industry has drifted towards an open, ring-shaped configuration for pull tabs. See U.S. Patent Des. 289,017 and U.S. Patents 4,465,204 and 4,530,631 . These tabs are preferred not only because they have an aperture for accepting the finger of a user (which aids the opening process), but also because they allow the industry to use less material in producing the tabs. However, ring-shaped tabs have proven ineffective for accepting indicia thereon, (whether produced by ink-jet printing, stamping, mechanical etching, or otherwise), due to the limited surface area of the tab.
- ink-jet printing lacks both predictability and permanence.
- the inability to repeatedly produce the same clear image on a small substrate is systemic in the ink-jet process.
- Inks are also easily removed from most substrates by everyday solvents.
- counterfeiters could easily remove any contest-based indicia from a pull-tab and apply their own ink indicia in place thereof; making such contests impractical for ink-jet printed tabs.
- ink-jet printing has proven not only logistically and technically prohibitive but also unduly costly and of limited utility.
- the present invention overcomes the practical problems described above and offers new advantages as well.
- the present invention is based on the realization that laser-etching pull tabs to a depth that ablates a portion of the tab substrate provides consistent, high-definition indicia which is surprisingly tamper-resistant and permanent.
- Applicant previously disclosed a method of providing coated tab stock in which decorative, promotional, or informative indicia is laser-etched thereon.
- Applicant's previous applications U.S. Serial No. 08/917,516, filed August 26, 1997 and U.S. Serial No. 09/061,227, filed April 17, 1998 teach laser-etching pull tabs in order to provide high definition, high clarity indicia thereon.
- pull tabs having one or more coating layers had portions of such layers selectively removed to form indicia on said pull tab.
- a pull tab is provided having selective removal of not only the coating layer or layers, but also a portion of the substrate itself.
- the substrate itself may be permanently etched with at least a portion of the intended indicia, thereby preventing counterfeit or easy disfiguration of the pull tab's indicia.
- laser ablation of a portion of the substrate creates a visually contrasting image due to the sublimation and oxidation of the substrate.
- Laser ablation of the substrate surface to a specified depth allows for a physical relief of the substrate whereby the indicia is not only visible but also detectable by touch.
- braille language letters can be etched into the tab to identify the contents of the container.
- the substrate can be ablated or etched to any desired depth.
- a pull tab container opening device having at least one substantially permanent coating layer thereon and having informational, promotional or decorative materials thereon, wherein said materials are formed by the selective laser removal of at least a portion of said coating layer and a portion of said substrate.
- the pull tabs of the present invention may be made of any suitable material which is capable of functioning of as a pull tab for a container including aluminum, steel, plastic, other metals, and/or any natural, synthetic, composite, or other suitable material.
- suitable materials are well within the ability of one of ordinary skill in the art.
- the tabs may also include a ring-shaped aperture for receiving the finger of a user. Construction of suitable pull tabs according to the invention is well within the ability of one of ordinary skill in the art. The invention should not be understood as being limited by the shape, size or material of the pull tab substrate.
- a pull tab comprising an aluminum alloy as substrate wherein said tab is contacted with the emission of an optical device capable of ablating the surface of said tab such that the surface of said tab is permanently etched.
- the etching may be of any depth desired. Preferable depths are between 5 and 50 microns, and more preferably, between 15 and 30 microns.
- the pull tab has at least a coating layer thereon, wherein said pull tab has indicia generated thereon by the laser ablation of a portion of a said coating layer to reveal at least a portion of said substrate which is also selectively ablated by the laser to any suitable depth.
- a pull tab having a plurality of coating layers thereon.
- the pull tab according to the invention has an image of multiple colors generated thereon, wherein said image is generated by the selective removal (through selective laser ablation) of said coating layers and the surface of said substrate such that at least a portion of said image is permanently etched in said substrate to a desired depth.
- Suitable coatings for pull tabs according to the invention include any coatings capable of selective removal by laser ablation.
- the coatings used on a substrate should be more susceptible to laser ablation, by sublimation or otherwise, than the surface of the substrate.
- the operator of a laser etching apparatus according to the invention can remove the coatings without affecting the surface of the pull tab unintentionally.
- coatings include those readily accessible by those of ordinary skill in the art.
- Alcoa supplies tab stock with suitable coatings supplied by Dexter, Balspar, BASF, and numerous others.
- the coating type is not limited to epoxy, vinyl or other organic coating.
- multiple layers of contrasting coatings may be used so that selective removal of portions of the layers may reveal a multiple color design.
- the present invention should not be understood to be limited by the number or color of coatings supplied, nor by the substrate to which indicia is to be applied.
- the present invention is also not limited by the laser-etching method used to decorate pull tabs according to the invention.
- the present invention is also not limited by the laser-etching method used to decorate pull tabs according to the invention.
- One presently preferred method for laser-etching a design into a pull tab is computer-aided laser etching.
- a design is laser-etched into a substrate with the aid of a computer and computer peripherals, wherein the laser-etching device is controlled by a computer program which controls the orientation and path of the laser beam to generate an ablated pattern.
- Any laser device suitable for computer-aided laser etching may be used according to the invention.
- the work piece, in this case a pull tab preferably includes a surface upon which a single layer or multiple layers of coating material, such as an oxidizable paint or organic coating, has been applied.
- a presently preferred method is performed by the following steps: a design is input into a computer memory by use of a scanner or other input device; the design is then scaled to the desired size; the intensity of the laser beam is selected so that only the desired layer or layers of material are removed to a specific depth; and the control program is allowed to direct the laser beam to etch away appropriate portions of the layer or layers of the ablatable materials, thus exposing and/or etching the underlining surface or coating to form the desired image.
- multiple color and multiple layer designs may be formed by programming the laser beam to remove different portions and depths of each layer to create a multi-colored or multilayered design.
- a presently preferred embodiment involves use of a yttrium aluminum garnet (“YAG”) laser marker.
- YAG marking process works by steering the laser beam with a pair x and y galvanometers which are controlled by software and hardware interfaces.
- indicia are inscribed on to the substrate with extremely fine resolution and clarity, thereby providing striking contrast and resolution as compared to prior art ink-printed substrates.
- a presently preferred method for laser-etching a design into a pull tab is mask-etching.
- CO 2 lasers or other similar high gain optically pumped laser devices, suited for laser marking may be used.
- CO 2 and like lasers may use a mask or stencil for etching purposes.
- a presently preferred embodiment contemplates use of a laser device in which a mask defining a desired pattern is placed in the laser's optical cavity. The output power or energy emanating from the laser should be sufficient to affect physical alterations of surfaces such that the desired pattern from the mask is engraved into the surface of the substrate contacted by the output of the laser device.
- the mask structure may be disposed between the output of the laser device and the surface of the substrate anywhere along the output's path. Accordingly, one of ordinary skill in the art will appreciate that various configurations of where the mask or stencil is positioned between the laser source and the substrate surface are within the scope of the invention.
- suitable mask structures include those having cut-out portions defining the desired pattern to be engraved on the substrate.
- equivalent patterns can be formed by providing masks having portions that are simply transmissive to the particular wave length of laser light involved. Accordingly, the term "cut-out portions" is meant to include any equivalent means of defining patterns on the mask such that the pattern is capable of being etched into the surface of the substrate being worked upon.
- mask structures are used with lasers when a pattern having a uniform depth is desired. Mask structures are not as susceptible to altering the intensity or depth of various portions of the indicia to be generated on a substrate.
- multiple masks and/or multiple laser devices may be used for generating indicia having varying depths of ablation or multiple layers to be selectively ablated.
- a presently preferred embodiment involves a single mask and a single layer whereby a coated pull tab has the pattern of the mask ablated through the coating layer and into the substrate to a depth of up to 30 microns.
- Such an embodiment allows for the rapid engraving of numerous tabs at production speeds.
- CO 2 laser etching is primarily suited to generating indicia on pull tabs having a single coating layer or having no coating layer at all.
- assembly-line type laser etching stations may be set up along the production line such that as a substrate passes each station a different portion of the indicia is quickly laser-etched onto the substrate.
- FIG. 1 illustrates a novel, laser-etched container opening device according to the present invention.
- a representative aluminum can top 120 or other container top, is provided for receiving a container opening device.
- Can tops, or container lids are typically formed into a desired shape for receiving a container opening device and for attachment to a container body within a conversion press (not shown).
- various bubbles and deformations known as "coins" are imparted into the can top in order to enhance the strength thereof.
- the can top of FIG. 1 shows typical anti-buckle coins 121 produced within the conversion press.
- An additional coin 126 is also shown on FIG. 1.
- the can top also includes a top opening score 122 to allow the container to be opened by a user, and a top rim 123 to allow the top to be attached to a suitable container body.
- Other deformations 127 may also be present in the scored panel 128 to help provide access to the contents of the container.
- a pull tab 124 is provided for actuation by the user.
- pull tabs are typically formed from a thin sheet of tab stock material in a conversion press.
- various cutting and stamping dies operate on the sheet of tab stock material to form a sheet of pull tabs capable of being pulled from the sheet and attached to a container top.
- a tab 124 may be riveted, or staked, onto a button 125 in the can top by a re-strike action of the conversion press.
- today's typical pull tab comprises a grab portion 129 and a nose portion 130.
- the grab portion 129 may be lifted to force the nose potion 130 into intimate contact with the scored panel 128.
- the opening score 122 tears and the panel 128 may be folded down to allow access to the contents of the container.
- an interruption (not shown) in the opening score 122 prevents the panel 128 from detaching from the can top 120 and falling into the container.
- a slit 131 may be advantageously provided in the pull tab 124 in order to facilitate its action as a lever with the staked button 125 acting as a fulcrum connection point.
- almost any tab of any size, shape, or configuration may be suitable for use in the present invention.
- the grab portion is preferably configured to not include an aperture for accepting the finger of a user, but rather configured to be a "closed-tab.”
- a closed-tab configuration provides additional surface area upon which to apply promotional, informational or decorative materials.
- the pull tab of FIG. 1 exhibits a decoration 132 illustrated as a "value mark" logo.
- the decoration 132 is laser-etched into the surface of the pull tab substrate.
- laser-etching is intended to mean the process by which a selective portion of a material is removed by contact with a laser beam to form a desired pattern of a desired depth by localized sublimation, evaporation, burning, oxidation, or other process, of the contacted material or materials.
- the logo "value mark" and the border surrounding the logo are preferably the result of the surface of the pull tab being contacted by the beam of a laser such that the contacted area is ablated in a predetermined pattern to a predetermined depth.
- an aluminum pull tab such ablated areas achieve, quite unexpectedly, remarkably visually-contrasting images due to the oxidation and sublimation of the substrate.
- the ablated areas are of a surprisingly different shade and/or color than the untreated areas.
- Such a stark visual contrast in color is not achievable by mechanical etching, stamping or chemical engraving of aluminum pull tabs.
- laser-etching allows images to be generated on substrates to almost any resolution; visually perceptive or otherwise. Such resolution is likewise not reliably achievable by prior art methods.
- the visual contrast achievable through laser-etching techniques can also be used to provide informational, promotional or decorative materials onto other parts ofthe container.
- the can decoration 133 "brand equity" is etched directly into the can top 120.
- Such can decorations are preferably generated on can tops that have a colored coating on, or pigment in, the aluminum (or other material) of the top, because the visual contrast and the striking clarity systemic in the laser-etching process are even more striking.
- laser-etched pull tabs according to the invention are preferably etched to a predetermined depth whereby a physical relief which may be detectable to the touch is generated on the pull tab.
- the etching is preferably to a depth of from about 5 microns to 50 microns, and more preferably from about 15 microns to about 30 microns.
- controlling the depth to which a laser ablates the surface of a substrate is dependent upon, and can be controlled by, the manipulation of multiple factors.
- each ofthe type, power and contact time of the laser device allow the user to effect the depth of the etching.
- the type of substrate, coating, etc. allow the user to predetermine the depth of etching through trial and error or otherwise.
- laser-etching allows for rapid, high volume production of products having virtually identical, highly-resolved indicia generated thereon. Such predictability and repeatability are not achievable by prior art printing techniques.
- Two presently preferred laser-etching methods are computer-aided laser etching and mask etching.
- computer-aided etching typically entails the use of a computer and computer peripherals to control the orientation, path, and/or power of a laser's beam to generate an ablated pattern on a workpiece.
- a design is input into the memory of a computer through either a scanner, a keyboard, both, or any other device or method of inputting a design known in the art.
- the computer may then communicate the design to a laser engraving device which engraves the design onto the workpiece by use of the devices laser beam.
- a presently preferred embodiment makes use of a YAG laser device, and more preferably a 120 watt Nd:YAG laser device having a 530 nm wavelength.
- the computer may be a typical personal computer, such as an IBM 486, Pentium or like computer, which has been programmed with a laser control program.
- a laser control program is the LUMONICS SOLO user interface software which is available with a LUMONICS LIGHTWRITER SPE laser engraving device.
- control software, engraving devices, etc. whether presently existing or not, which are capable of performing the method described herein are within the scope of the invention, and that the brands and models discussed are by way of example only and should not be deemed to limit the scope of the invention.
- an operator enters an input design, such as "value mark" into the memory of a computer.
- the design may be entered into the memory of the computer by scanning the image into a scanner or by typing, or both, or otherwise entering the image with a computer keyboard.
- the operator may be able to modify the input design in a variety of ways. For example, it is presently preferred that the operator be able to scale the design by any conventional technique such that the whole, or any part, of the design is capable of being made larger or smaller, or such that multiple images may be combined in whole or in part.
- the workpiece is then placed in a position that is within the path of the laser beam.
- the intensity of the laser beam is adjusted so that the etching will be to a proper, predetermined depth.
- the laser beam is then controlled by the computer to etch the design into the workpiece.
- computer control of the laser beam involves software and hardware interfaces which control a pair of X and Y galvanometers which steer the laser in a path corresponding to the output design.
- the output design etched should reflect the input design and any modifications made by the operator.
- the depth of the etching may be controlled by various means.
- a presently preferred method of controlling the depth of the etch is by varying the intensity ofthe beam. It is well within the ability of one skilled in the art to know, or learn through trial and error or otherwise, the proper settings for the particular laser and laser beam utilized in view of the particular workpiece involved.
- the laser etching may be effectuated by the mask-etching method.
- this method typically involves shining a laser beam through a mask, and possibly other peripherals, prior to contacting the surface of a workpiece.
- the choice of a suitable laser device for this method of etching is well within the ability of the ordinarily skilled artisan.
- Presently preferred devices include high gain pump devices such as CO 2 lasers.
- the mask material should be capable ofresisting penetration of the laser beam.
- the mask may be disposed within the lensing-system of the laser source, at the output point of the laser device, or otherwise disposed along the path of the laser beam. Alternatively, the mask may operate as a stencil which sits against the workpiece during the marking process.
- the mask typically includes cut-out portions in the shape of the desired image, whereby the only portions of the beam penetrating the mask are those in the shape of the desired image.
- suitable mask structures include not only those having cut-out portions defining the desired pattern to be engraved on the substrate, but also those that have portions that are simply transmissive to the particular wave length of laser light involved. Accordingly, the term “cut-out portions” is meant to include any equivalent means of defining patterns on the mask such that the pattern is capable of being etched into the surface of the workpiece being worked upon.
- mask structures are used with suitable lasers when a pattern having a uniform depth are desired because mask structures are not as susceptible to altering the intensity or depth of various portions of the indicia to be generated on a workpiece.
- multiple masks and/or multiple laser devices may be used for generating indicia having varying depths of ablation or multiple layers to be selectively ablated.
- a presently preferred embodiment involves a single mask and a single layer whereby a coated pull tab has the pattern of the mask ablated through the coating layer and into the substrate to a depth of up to 30 microns.
- Such an embodiment allows for the rapid engraving of numerous tabs at production speeds.
- mask-etching with a CO 2 or like laser is primarily suited to generating indicia on pull tabs having a single coating layer or having no coating layer at all.
- FIG. 2A depicts a single coating layered, laser-etched substrate according to the invention.
- a substrate 150 having a coating layer 151 thereon.
- Presently preferred coating layers include those readily accessible by those of ordinary skill in the art.
- Alcoa supplies tab stock with suitable coatings supplied by Dexter, Balspar, BASF, and numerous others.
- the coating type is not limited to epoxy, vinyl or other organic coating.
- the coating layer 151, and at least a portion of any part of the substrate 150 revealed thereunder are laser-etched to provide a permanent etched-area 160 capable of defining an exceptional, visually striking image for promoting or decorating the container.
- the workpiece materials and process parameters can be chosen to cause ablation of the surface(s) of the coating layer(s) and substrate to be ablated in almost any desired pattern, to almost any desired depth.
- the substrate 150 may be an aluminum tab, or some other container opening device to be decorated or marked.
- this substrate is an opening device for a food or beverage container, however, any other suitable substrate may also be marked.
- Presently preferred substrates may be made of any suitable material and may form a part of a pull tab, can top, bottle cap, container lid, or any other portion of a container device.
- the substrate is coated with more than one layer.
- FIG. 2B shows four layers of coatings on the substrate 150.
- coatings are preferably materials capable of laser ablation and more preferably, materials more susceptible to laser ablation by the intended laser than the underlying substrate or underlying layers and substrate.
- Presently preferred coating layers include those readily accessible by those of ordinary skill in the art.
- Alcoa supplies tab stock with suitable coatings supplied by Dexter, Balspar, BASF, and numerous others.
- the coating type is not limited to epoxy, vinyl or other organic coating.
- the coatings may be of any suitable colors. Preferably, the coatings are of visually differing or contrasting colors such that a multi-colored image may be created.
- the multi-coated substrate of FIG. 2B may comprise a cyan layer 151, a magenta layer 152, a yellow layer 153, and a black layer 154.
- a removal of all four layers, such as an area 155 reveals a natural aluminum color.
- Area 156 shows the removal of three layers revealing a cyan color.
- Area 157 shows the removal of two layers revealing a magenta color.
- Area 158 shows removal of a single layer revealing a yellow color. In this fashion virtually any color can be generated.
- area 159 shows not only the removal of all four layers, but also the partial ablation of a portion of the substrate to a desired depth.
- a permanent etched-area 160 may be created. Such an area will continue to serve to identify the tab even if the layers (151,152,153,154) are removed by chemical means, physical means, or otherwise.
- such permanent ablation of the surface of a substrate can serve to prevent counterfeiting or prolong the informational, promotional or decorative power of the substrate.
- FIG. 3A and FIG. 3B are photomicrographs of the ink-printed characters applied to the underside of a "Mountain Dew" soda can (produced by Pepsi-Cola Company).
- FIG. 3A and 3B were taken by a Scanning Electron Microscope ("SEM") at 15X and 30X, respectively.
- SEM Scanning Electron Microscope
- FIG.4A-B are photomicrographs at 15X and 30X, respectively, of a laser-etched coated aluminum substrate according to the invention. More specifically, FIG.4A-B are photomicrographs of a piece of 5052H19 aluminum-alloy substrate having a 3msi (about 1.9 micron thick) Valspar 26839-803 black epoxy coating which was treated at production speeds with a 120 Watt-powered, Nd:YAG-type laser, having a 530 nm wavelength.
- FIGs. 3A-B to FIGs. 4A-4B reveals that typical laser ablation craters generated by a Nd:YAG or similar laser are only approximately 60 microns in diameter, which is a full magnitude of difference smaller in size than a typical ink dot (which averages between about 600 to 700 microns) of an ink printing process. Accordingly, as will be appreciated by one of ordinary skill in the art, the resolution and clarity capable of being generated by laser etching is also a full magnitude of difference better than that of the ink printing process.
- laser ablations are substantially uniform in shape, surface area and appearance; whereas ink dots are non-uniform in shape, surface area and appearance (which adversely affects clarity and resolution). Accordingly, as will be appreciated by one of ordinary skill in the art, laser etching inherently results in an image having better resolution and sharpness. Furthermore, typical laser ablations are extremely precise in location and predicable in occurrence, thereby promoting a visually uniform and virtually uninterrupted pattern of ablations as compared to the spotty deposition of ink dots which is systemic in the ink printing process. In addition, laser ablations allow for a visually clear demarcation between the color-coated area and the laser-treated area as compared to the unpredictable contours and ink-concentration of ink dots generated in the ink printing process.
- FIGs. 5A-C are micrographs of the embodiment of FIG. 4 at differing positions and resolutions. As shown in the photomicrographs, the surface of the aluminum substrate below the coating may be ablated to a predetermined depth. In a presently preferred embodiment, the substrate is etched to a depth of about 5 to about 50 microns, more preferably a depth of about 15 to about 30 microns. The substrate ofFIG. 5 is ablated to a presently preferred depth of about 30 microns.
- laser-etching substrates such as pull tabs according to the invention overcomes many of the shortcomings and limitations of the prior art, and satisfies a long-felt, yet unresolved need.
- laser-etching processes can be carried out at any suitable stage of an article of manufacture's life-span.
- the laser-etching process may be carried out prior to, during, or after a tab stock material is formed into pull tabs and connected to the top of a container.
- FIG. 6 A representative apparatus for manufacturing pull tabs according to the invention is depicted in Figures 6-8.
- the apparatus comprises a modified conversion press 70.
- Typical conversion presses for the manufacture of prior art tabs are commercially available from such companies as Burderer or Minister.
- the modified press 70 includes a container end conveyer 71 for transporting container ends through the press 70.
- the container end conveyer 61 has an inlet 72 for accepting untabbed container ends and an outlet 73 through which tabbed container ends may be collected.
- the conveyer 71 transports container ends from the inlet 72, through the press 70, to the outlet 73, where tabbed container ends may be collected.
- the press 70 also includes a tab stock inlet 74 and a formed tab strip outlet 76. Interposed between the tab stock inlet 74 and tab strip outlet 76, and transversing the conveyer 71, is a die area 75.
- the die area 75 comprises a plurality of cutting and stamping dies (not shown) which operate to form and shape materials pressing therethrough into a desired configuration.
- the die area 75 may treat container ends as they pass through the die area 75 on conveyer 71.
- tab stock 90 may enter the press 70 through the tab stock inlet 74. As depicted in FIG. 6, a strip of tab stock 90 enters through the inlet 74 and then passes into the die area 75 where it is cut and shaped into formed tabs.
- the formed tab strip 91 may then exit the press 70 through formed tab strip outlet 76.
- the die area 75 is composed of a plurality of interchangeable cutting dies and stamping dies.
- interchangeable parts allows a single press to be used in manufacturing a plurality of differently shaped tabs comprised of a plurality of different materials.
- the die could be rigged to produce a tab lacking a finger aperture by removing or blocking the aperture cutting dies. Accordingly, numerous other modifications to the die area to produce differently configured tabs can be fully appreciated by the skilled artisan in view of Applicant's specification.
- the formed tab strip 91 after exiting the press 70 through formed tab strip outlet 76 may reenter the press 70 through the formed tab strip inlet 77.
- the formed tab strip 91 is then fed into a riveting area 78 adjacent the conveyer 71.
- formed tabs are removed from the formed tab strip 91 and riveted to container ends entering the riveting area 78 via the conveyer 71.
- the formed tab strip scrap 92 then exits the riveting area 78 and, ultimately, the press 70 through the tab scrap outlet 79.
- Container ends exit the riveting area 78, having tabs riveted thereto, by means of the conveyer 71.
- the conveyer ultimately feeds the tabbed container ends out of the press 70 at the conveyer outlet 73 where the container ends may be collected.
- the tab strip scrap 92 exiting the tab scrap outlet 79 may also be collected and used for other purposes, such as being recycled into fresh tab stock 90.
- Tab stock 90 may comprise any material capable of use as a pull tab container opening device.
- Exemplary materials include aluminum, steel, plastic, or any natural, synthetic, composite, or other suitable material. Similarly, combinations of materials as layers or otherwise may also be used. Accordingly, one of ordinary skill in the art will understand that corresponding manipulation of the modified press 70 may be necessary to accommodate different materials.
- the tab stock 90 comprises aluminum.
- aluminum tab stock strips may be any suitable width and of any desired length.
- existing presses accommodate tab stock of either 1.9 or 2.8 inches in width and .009-.010 inches in depth.
- the depth of the stock can be increased, depending on the strength desired and the material used.
- a preferred embodiment contemplates an aluminum strip of about 1-3 inches in width and about .0125 inches in depth.
- Colored tab stock 90 may be used with the present invention if colored tabs are desired. To effectuate the coloring, pigmentation may be used while forming the tab stock 90, or alternatively, the tab stock 90 may be coated with a colored material. Similarly, as will be appreciated by one of ordinary skill in the art, other colored or coated materials, such as plastics, may be used.
- a laser-etching station 100 may be used.
- the laser-etching station 100 may be an area within the modified press 70.
- the laser-etching station 100 may be located outside the press 70, although it may still be in-line or integral with the press 70.
- the laser-etching station 100 is located at an area whereby the tab stock 90 can be decorated prior to entering the tab stock inlet 74.
- the laser-etching station 100 may be integral with the feed mechanism that feeds tab stock 90 into the tab stock inlet 74; or alternatively, the laser-etching station 100 may be situated at a location for treating tab stock 90 which is not even housed in the area where the press 70 is located. In other words, the tab stock 90 may be decorated and then brought to a location housing a press 70.
- FIG. 7 depicts an alternative embodiment of an apparatus for manufacturing pull tabs in accordance with the present invention.
- the laser-etching station 100 is located outside the press 70 but in-line with the tab stock 90 such that the formed tab strip 91 exits the press 70 at tab strip outlet 76 and then passes through laser-etching station 100 prior to reentering the press 70.
- the laser-etching station 100 may perform all of the decorating functions within the scope of the invention no matter where it is housed, placement of the laser-etching station 100 in-line and capable of receiving the formed tab strip 91 is a presently preferred process.
- the tabs are already formed in the strip which may enhance the speed and ability of the apparatus, through mechanical orientation or computer recognition, or otherwise, to provide substantially the same tab decorations on each tab.
- the laser-etching station 100 may be used in connection with an accumulator (not shown) that may be used to allow the die area 75 to operate at a faster pace than can be accommodated by the laser-etching station 100.
- FIG. 8 depicts another alternative embodiment of an apparatus for manufacturing tabs in accordance with the present invention.
- the laser-etching station 100 in FIG. 8 is located at an area for receiving tabbed container ends exiting the conveyer 71 at the conveyor outlet 73.
- the laser-etching station 100 is of a generally cylindrical shape. Disposed within the laser-etching station 100 is a cylindrical track 101 for accepting a plurality of tabbed container ends.
- the laser-etching station 100 also has an interior section 102 encircled by the cylindrical track 101.
- tabbed container ends exit the conveyor 71 at the conveyor outlet 73 and are received by the cylindrical track 101 of the laser-etching station 100.
- the track 101 may be rotated in either direction such that the container ends may be rotated to or through one or more stations.
- different tab decorations can be etched onto the tabs, or container ends, at different stations.
- Laser etching equipment may be disposed within the interior section 102 of the laser-etching station 100 and/or located on the outer perimeter of the track 101. This embodiment may be preferred, or in combination with the previous embodiments, if decorations are to be supplied not only to the tabs, but also to the container ends.
- the laser-etching station 100 of the present invention may be configured in any manner suitable for etching the tab stock, formed tab strip, or tabs before or after attachment to the container.
- the exact layout and design of the laser-etching station will vary according to the methods and materials to be used.
- the laser-etching station may further comprise an apparatus for embossing, debossing, inscribing or etching tab decorations, or any combination thereof.
- the laser-etching station may comprise alone, or in combination with the above, any apparatus suitable for printing, screening, painting, adhering, gluing or otherwise placing or generating tab decorations on tabs or tab-making materials.
- the laser-etching station may make use of mechanical orientation or computer controlled artificial recognition systems to help ensure that the tab decorations appear substantially the same on the end product. It is also within the scope of the invention to make use of a plurality of laser-etching stations, for example, a combination of FIGs. 6-8.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
- Containers Opened By Tearing Frangible Portions (AREA)
- Wire Bonding (AREA)
Claims (12)
- Dispositif d'ouverture de conteneur comprenant une languette (124), ladite languette (124) comprenant un substrat (150) ; et une ou plusieurs couches de revêtement (151, 152, 153, 154) positionnées sur ledit substrat (150) de ladite languette (124), et ayant un point de fixation pour une fixation sur un conteneur, ladite languette (124) ayant une partie de préhension (129) orientée vers un côté dudit point de fixation, et une partie de nez (130) orientée sur un côté opposé dudit point de fixation, ladite languette (124) pouvant être actionnée pour ouvrir le conteneur, caractérisé par :une image gravée par laser (132) définie sur ladite languette (124), etdans lequel ladite image (132) est créée par un enlèvement au laser sélectif d'une partie de ladite ou desdites couches de revêtement (151, 152, 153, 154) et l'ablation au laser sélectionnée d'une partie dudit substrat (150) de ladite languette (124).
- Dispositif d'ouverture de conteneur selon la revendication 1, dans lequel la languette (124) est reliée à une partie supérieure de conteneur (120) qui est reliée à son tour à un corps de conteneur contenant un aliment ou une boisson.
- Dispositif d'ouverture de conteneur selon la revendication 1 ou 2, comprenant:deux couches de revêtement ou plus (151 à 154) disposées sur ladite languette (124) ;dans lequel ladite image (132) est créée par un enlèvement au laser sélectif de parties desdites couches de revêtement (151 à 154) et une ablation au laser sélective d'une partie dudit substrat (150) de ladite languette (124) exposée par l'enlèvement sélectif desdites couches de revêtement (151 à 154).
- Dispositif d'ouverture de conteneur selon l'une quelconque des revendications 1 à 3, dans lequel ladite languette (124) comprend un matériau sélectionné dans le groupe constitué de métaux et de matières plastiques.
- Dispositif d'ouverture de conteneur selon la revendication 4, dans lequel ledit matériau est un métal.
- Dispositif d'ouverture de conteneur selon la revendication 5, dans lequel ledit métal est de l'aluminium.
- Dispositif d'ouverture d'un conteneur selon la revendication 6, dans lequel ledit substrat (150) de ladite languette (124) subit une ablation jusqu'à une profondeur comprise entre environ 1 micron et environ 50 microns.
- Dispositif d'ouverture de conteneur selon la revendication 7, dans lequel ledit substrat (150) de ladite languette (124) subit une ablation jusqu'à une profondeur comprise entre environ 15 microns et environ 30 microns.
- Dispositif d'ouverture de conteneur selon la revendication 8, dans lequel ladite ablation au laser sélective est effectuée par un gravage au laser assisté par ordinateur.
- Dispositif d'ouverture de conteneur selon la revendication 9, dans lequel ledit gravage au laser assisté par ordinateur est effectué par un laser Nd:YAG.
- Dispositif d'ouverture de conteneur selon la revendication 8, dans lequel ladite ablation au laser sélective est effectuée par une gravure à masque.
- Procédé de fabrication d'un dispositif d'ouverture de conteneur à languette gravée au laser comprenant les étapes consistant à fournir une partie de matière première de languette incluant un substrat (150), former ladite matière première de languette en une languette (124) adaptée pour une fixation pouvant être actionnée sur un conteneur, et caractérisé par les étapes consistant à :appliquer au moins une couche de revêtement sensiblement permanente (151 à 154) sur la surface de ladite languette (124) avant une ablation au laser de ladite surface, etpratiquer l'ablation au laser d'une surface dudit substrat (150) de languette (124) à une profondeur prédéterminée comprise entre 1 et 50 microns pour générer un repère sensiblement permanent (160) sur ladite languette (124), de sorte qu'une partie de ladite au moins une couche de revêtement (151 à 154) est également enlevée par une ablation au laser pendant ladite étape d'ablation au laser.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CY20081100305T CY1107250T1 (el) | 2000-03-13 | 2008-03-18 | Διαταξη ανοιγματος περιεκτη υπο μορφη γλωσσιδας τραβηγματος χαραγμενης με λεϊζερ και μεθοδος κατασκευης αυτης |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18868100P | 2000-03-13 | 2000-03-13 | |
US188681P | 2000-03-13 | ||
CA002307074A CA2307074A1 (fr) | 2000-03-13 | 2000-04-28 | Dispositifs d'ouverture de contenants composes d'onglets graves au laser et methodes de fabrication de ces produits |
CA2307074 | 2000-04-28 | ||
PCT/CA2001/000316 WO2001068460A2 (fr) | 2000-03-13 | 2001-03-12 | Dispositif et procede destines a ouvrir un contenant a languette de prehension gravee au laser et fabrication de ladite languette |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1218248A2 EP1218248A2 (fr) | 2002-07-03 |
EP1218248B1 true EP1218248B1 (fr) | 2007-12-19 |
Family
ID=25681765
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01914869A Expired - Lifetime EP1218248B1 (fr) | 2000-03-13 | 2001-03-12 | Dispositif d'ouverture d'un contenant a languette de prehension gravée au laser et son procédé de fabrication |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1218248B1 (fr) |
AT (1) | ATE381495T1 (fr) |
AU (1) | AU784218B2 (fr) |
DK (1) | DK1218248T3 (fr) |
ES (1) | ES2300322T3 (fr) |
WO (1) | WO2001068460A2 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011070107A1 (fr) | 2009-12-09 | 2011-06-16 | Crown Packaging Technology, Inc. | Extrémité de canette pourvue d'un insert de film |
EP2760752A1 (fr) | 2011-09-27 | 2014-08-06 | Crown Packaging Technology, Inc | Marquage de couvercles de canette et/ou d'anneaux de préhension utilisant une encre sensible aux photons |
US9186924B2 (en) | 2012-04-17 | 2015-11-17 | Rexam Beverage Can Company | Decorated beverage can tabs |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050045637A1 (en) * | 2003-08-28 | 2005-03-03 | Rainer Rohr | Containers having distinctive tabs with laser etching and void forming a promotional image |
SG147281A1 (en) * | 2004-02-25 | 2008-11-28 | Crown Packaging Technology Inc | Process and system for manufacturing printed can ends |
GB2428659B (en) * | 2005-07-13 | 2007-11-21 | Rexam Beverage Can Europe Ltd | Character (E.G., cartoon) ends for cans |
US8146768B2 (en) | 2009-02-04 | 2012-04-03 | Rexam Beverage Can Company | Tab with emboss and deboss beads |
US8844747B2 (en) | 2010-03-19 | 2014-09-30 | Rexam Beverage Can Company | And temperature indicating can ends and tabs |
US20130075401A1 (en) | 2011-09-23 | 2013-03-28 | Rexam Beverage Can Company | Stay-on tab for a beverage container |
US8842951B2 (en) | 2012-03-02 | 2014-09-23 | Analog Devices, Inc. | Systems and methods for passive alignment of opto-electronic components |
US9716193B2 (en) | 2012-05-02 | 2017-07-25 | Analog Devices, Inc. | Integrated optical sensor module |
US10884551B2 (en) | 2013-05-16 | 2021-01-05 | Analog Devices, Inc. | Integrated gesture sensor module |
US9590129B2 (en) | 2014-11-19 | 2017-03-07 | Analog Devices Global | Optical sensor module |
CN107613822B (zh) | 2015-04-17 | 2021-01-15 | 鲍尔公司 | 用于控制材料的连续片体的速度的方法和设备 |
US10421111B2 (en) | 2015-04-17 | 2019-09-24 | Ball Corporation | Method and apparatus for controlling an operation performed on a continuous sheet of material |
US10712197B2 (en) | 2018-01-11 | 2020-07-14 | Analog Devices Global Unlimited Company | Optical sensor package |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4363179A (en) * | 1981-07-27 | 1982-12-14 | Crown Cork & Seal Company, Inc. | Promotional can end |
US4465204A (en) * | 1983-07-13 | 1984-08-14 | The Stolle Corporation | Pull tab for easy open end |
US5422383A (en) * | 1993-04-22 | 1995-06-06 | Somar Corporation | Laser beam absorbing resin composition, coloring material therefor and laser beam marking method |
US5855969A (en) * | 1996-06-10 | 1999-01-05 | Infosight Corp. | CO2 laser marking of coated surfaces for product identification |
CZ300642B6 (cs) * | 1997-08-26 | 2009-07-08 | Zpusob výroby zarízení k otevrení nádobky, zarízení k otevrení nádobky a nádobka opatrená tímto zarízením |
-
2001
- 2001-03-12 EP EP01914869A patent/EP1218248B1/fr not_active Expired - Lifetime
- 2001-03-12 AU AU42140/01A patent/AU784218B2/en not_active Withdrawn - After Issue
- 2001-03-12 DK DK01914869T patent/DK1218248T3/da active
- 2001-03-12 WO PCT/CA2001/000316 patent/WO2001068460A2/fr active IP Right Grant
- 2001-03-12 AT AT01914869T patent/ATE381495T1/de active
- 2001-03-12 ES ES01914869T patent/ES2300322T3/es not_active Expired - Lifetime
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011070107A1 (fr) | 2009-12-09 | 2011-06-16 | Crown Packaging Technology, Inc. | Extrémité de canette pourvue d'un insert de film |
EP2760752A1 (fr) | 2011-09-27 | 2014-08-06 | Crown Packaging Technology, Inc | Marquage de couvercles de canette et/ou d'anneaux de préhension utilisant une encre sensible aux photons |
EP3279104B1 (fr) | 2011-09-27 | 2019-06-12 | Crown Packaging Technology, Inc. | Procédé de fourniture d'informations lisibles par machine sur extrémités de boîtes de conserve |
US9186924B2 (en) | 2012-04-17 | 2015-11-17 | Rexam Beverage Can Company | Decorated beverage can tabs |
US10118729B2 (en) | 2012-04-17 | 2018-11-06 | Rexam Beverage Can Company | Decorated beverage can tabs |
Also Published As
Publication number | Publication date |
---|---|
ATE381495T1 (de) | 2008-01-15 |
EP1218248A2 (fr) | 2002-07-03 |
WO2001068460A3 (fr) | 2002-04-25 |
DK1218248T3 (da) | 2008-04-21 |
AU784218B2 (en) | 2006-02-23 |
AU4214001A (en) | 2001-09-24 |
ES2300322T3 (es) | 2008-06-16 |
WO2001068460A2 (fr) | 2001-09-20 |
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