CA1222703A - Tape closure for a can end - Google Patents
Tape closure for a can endInfo
- Publication number
- CA1222703A CA1222703A CA000444559A CA444559A CA1222703A CA 1222703 A CA1222703 A CA 1222703A CA 000444559 A CA000444559 A CA 000444559A CA 444559 A CA444559 A CA 444559A CA 1222703 A CA1222703 A CA 1222703A
- Authority
- CA
- Canada
- Prior art keywords
- layer
- tape
- adhesive
- container end
- bond
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- 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
- B65D17/505—Flexible tape or foil-like material applied to the external and internal part of the container wall
-
- 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
- B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
- B65D41/32—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings
-
- 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
- B65D2517/008—Materials of container end panel
- B65D2517/0082—Coated or laminated metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
- B65D2517/0001—Details
- B65D2517/0091—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
- B65D2517/5002—Details of flexible tape or foil-like material
- B65D2517/5024—Material
- B65D2517/5032—Laminated
- B65D2517/5035—Laminated and connected to container by local areas of adhesive
-
- 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
- B65D2517/5083—Details of hand grip, tear- or lift-tab with means facilitating initial lifting of tape, e.g. lift or pull-tabs
Landscapes
- Mechanical Engineering (AREA)
- Engineering & Computer Science (AREA)
- Adhesive Tapes (AREA)
- Package Frames And Binding Bands (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Cartons (AREA)
- Details Of Rigid Or Semi-Rigid Containers (AREA)
- Laminated Bodies (AREA)
- Supplying Of Containers To The Packaging Station (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
- Valve Device For Special Equipments (AREA)
- Closures For Containers (AREA)
- Glass Compositions (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
- Professional, Industrial, Or Sporting Protective Garments (AREA)
- Details Of Garments (AREA)
- Organic Insulating Materials (AREA)
- Containers Opened By Tearing Frangible Portions (AREA)
Abstract
Improved Tape Closure For A Can End Abstract of the Disclosure A tape closure which is adhesively adhered about a pour opening (15) on the exterior surface of a can end (12) having a protective polymeric layer (20) over the metallic can end which is adhered to the tape adhesive (26) with a bond qreater than the bond between the layer and the supporting surface therefor affording removal of the layer (20) upon breaking the layer (20) and delaminating the same from the support surface (19) upon removal of the tape.
Description
~ 3 458,56~ C~N/JCB
Description Improved Tape Closure For A Can End _echnical Fiel This invention relates to a container end assembly and in one aspect to an improved contalner end construction for use on beverage containers and having an opening in said end covered by a length o~ removable tape.
More particularly, this invention provides an improved tape closure for container ends which permits the clean opening of the container utillzing a tape closure.
The present invention provides an improved tape closure and has as an object thereof the leaving of a clean a~ea surrounding the pour hole upon removal of the tape.
This would be true of tape closures for container ends utilizing simply an exterior tape or a two-tape system, including an exterior tape and an interior sheet material situated circumjacent (over and surrounding) a preformed opening (i.e. a pour opening) in a container end portion.
The present invention provides a tape closure which when opened sufficiently to obtain access to the pour hole is not self-sealinc~ and thus o~Eers resistance to tampering which would not be possible of detection.
The present invention provides a tape closure Eor container ends which will withstand the internal pressure of carbonated beverages or other beverages where an internal pressure is developed.
The present invention provides an improved tape closure which is suitable ~or use with pressurized containers but which is easily removable as the force necessary for peeling the closure frorn the can end is relatively small compared to the force necessary to open score lines in the metal defining an opening. The present invention also reduces the amount of force necessary in a two-tape system for removing a tape closure.
Disclosure of Invention A contalner end assembly comprising: a container end formed of me-tallic material having an exterior surface and an interior surface and being formed with a pour opening; a polymeric layer over said exterior surface of said end; and a tape bonded by an adhesive to an area of the exterior surface of said layer circum-jacent and covering said pour opening, said adhesive forming a bond between said tape and said layer, the bond made between said tape and said layer has greater strength than the bond between said layer and the surface supporting said layer, causing said layer to break and peel from said end upon removal of the tape from the con-tainer end. The can end may be of tin plate or -tin-free steel, aluminum or a composite of plastic and metal. The adhesive is preferably a heat activatable thermoplastic bonded to the protec-tive polymeric layer in a pattern to provide at one end of the pour opening a narrowing of the adhesive bond across the width of the tape to afford an initial reduced area for force concentration for the easy fracture of the protective layer to delaminate the protective layer in the area of the adhesive bond of the tape to separate the protective layer from the can end utilizing the high shear strength of the bonds between the tape and the protective layer and the protective layer and the can to withstand the pres-sure but relying on the weak peel strength of the bond between the protective layer and the can end to afford an easy open tape closure. In a two-tape system an interior sheet material is adhered to the inner surface of the can end circumjacent the pour opening and, in the area of the pour opening, the external tape is bonded by the adhesive to the interior sheet material to afford _y~
Z7~
-2a-tearing of the interior sheet material at the edges of the pour opening as -the exterior tape is peeled from -the can end.
In the preferred embodiment the can end ls formed from metal sheet stock, e.g., tin-free s-teel (TFS), coated with a first exterior layer for the can end which may be a lacquer or an enamel, and a second protective layer which may be a lacquer, enamel or a vinyl coating, is placed over the first layer, each of which is cured after being coated by heating to afford a releasable bond between the two layers. The exterior tape is then bonded to the second layer by an adhesive which bonds the two more Eirmly than the second layer bonds to th0 first. When the tape is removed to open the can, the bond between the two layers is ruptured and the second layer is peeled from the can end 5 -with the tape, exposing a clean pour opening.
Brief Description of the Drawing The present invention will be explained in greater detail hereinafter with reference to the accompanying drawing wherein:
Figure 1 is a plan view of a container end assembly including a tape closure illustrating the present invention;
Figure 2 is a vertical sectional view taken along the line 2-2 of Figure l;
Figure 3 is a second vertical sectional view corresponding to that of Figure 2 showing the closure in the open position;
Figure ~ is a detail fragmentary vertical sectional view through the closure and can end of the 20 present invention with the closure in the open position;
Figure 5 is a fragmentary plan view of the container end with the closure in the open positioni ~i(Jure 6 is a plan view oL- a Eurttler em~o(ii.ment of the tape closure oE the present invention;
Figure 7 is a vertical sectional view taken along the line 7-7 of Figure 6; and Figure 8 is a second vertical sectional view showing the closure during removal of the tape.
Detailed Description Referring now to the drawing there is illustrated a preferred embodiment of a container end assembly accordil-g to the present invention and generally des:ignated by the reference numeral 10.
~2~7~3 The present invention can be ut;lized with can ends for containers of material which will not be pressuri~ed and in such applications only an exterior tape adhered to the container end circumjacent the pour opening would be utilized. The illustrated assembly includes a tape closure utilizing an exterior tape and an interior tape which is suitable for all applications.
The container end assembly 10 comprises a container or can end 12 formed o~ a Elexible metallic sheet material or metal which takes a permanent set when folded an~ has a circular flange 14 about the periphery for attachment to an end of a cylinclrical container. The can end 12 has a generally U-shape cut 15 defining three sides ~)l arl opc?rling in ~he container end fo~ming the l?our opening 15. On the fourth side of the pour opening 15, a tongue 16 is forlned which extends Erom the side into the pour opening to hold the tape, upon opening of the closure, in a position away from the pour opening and to restrict the possibility of entirely separating the tape closure from the can end upon opening the same such that the closure does not become separated ~rom the can and not properly deposited or disposed of by the person opening the container. The tongue-lilce portion 16 is described and claimed in U.S.
patent No. 4,108,330, assigned to the assignee o~ this invention.
Additionally, as taught in U.S. patent No.
3,990,603, assigned to the assignee o~ this application, the pour opening 15 preferably includes a relatively narrow arcuate portion 17 extending toward the flange 14 of the 30 can end 1~. The portion 17 will be the first part of the illustrated pour opening uncovered as the tape is being peeled from the can. When this occurs, the portion 17 permits a small area o~ the interior tape to be drawn against the edge of the opening 15 and it will hegin to tear along the edges of the portion 17 and progress along the remaining portions of the three sides of the opening 15 to neatly tear the interior sheet material covering the
Description Improved Tape Closure For A Can End _echnical Fiel This invention relates to a container end assembly and in one aspect to an improved contalner end construction for use on beverage containers and having an opening in said end covered by a length o~ removable tape.
More particularly, this invention provides an improved tape closure for container ends which permits the clean opening of the container utillzing a tape closure.
The present invention provides an improved tape closure and has as an object thereof the leaving of a clean a~ea surrounding the pour hole upon removal of the tape.
This would be true of tape closures for container ends utilizing simply an exterior tape or a two-tape system, including an exterior tape and an interior sheet material situated circumjacent (over and surrounding) a preformed opening (i.e. a pour opening) in a container end portion.
The present invention provides a tape closure which when opened sufficiently to obtain access to the pour hole is not self-sealinc~ and thus o~Eers resistance to tampering which would not be possible of detection.
The present invention provides a tape closure Eor container ends which will withstand the internal pressure of carbonated beverages or other beverages where an internal pressure is developed.
The present invention provides an improved tape closure which is suitable ~or use with pressurized containers but which is easily removable as the force necessary for peeling the closure frorn the can end is relatively small compared to the force necessary to open score lines in the metal defining an opening. The present invention also reduces the amount of force necessary in a two-tape system for removing a tape closure.
Disclosure of Invention A contalner end assembly comprising: a container end formed of me-tallic material having an exterior surface and an interior surface and being formed with a pour opening; a polymeric layer over said exterior surface of said end; and a tape bonded by an adhesive to an area of the exterior surface of said layer circum-jacent and covering said pour opening, said adhesive forming a bond between said tape and said layer, the bond made between said tape and said layer has greater strength than the bond between said layer and the surface supporting said layer, causing said layer to break and peel from said end upon removal of the tape from the con-tainer end. The can end may be of tin plate or -tin-free steel, aluminum or a composite of plastic and metal. The adhesive is preferably a heat activatable thermoplastic bonded to the protec-tive polymeric layer in a pattern to provide at one end of the pour opening a narrowing of the adhesive bond across the width of the tape to afford an initial reduced area for force concentration for the easy fracture of the protective layer to delaminate the protective layer in the area of the adhesive bond of the tape to separate the protective layer from the can end utilizing the high shear strength of the bonds between the tape and the protective layer and the protective layer and the can to withstand the pres-sure but relying on the weak peel strength of the bond between the protective layer and the can end to afford an easy open tape closure. In a two-tape system an interior sheet material is adhered to the inner surface of the can end circumjacent the pour opening and, in the area of the pour opening, the external tape is bonded by the adhesive to the interior sheet material to afford _y~
Z7~
-2a-tearing of the interior sheet material at the edges of the pour opening as -the exterior tape is peeled from -the can end.
In the preferred embodiment the can end ls formed from metal sheet stock, e.g., tin-free s-teel (TFS), coated with a first exterior layer for the can end which may be a lacquer or an enamel, and a second protective layer which may be a lacquer, enamel or a vinyl coating, is placed over the first layer, each of which is cured after being coated by heating to afford a releasable bond between the two layers. The exterior tape is then bonded to the second layer by an adhesive which bonds the two more Eirmly than the second layer bonds to th0 first. When the tape is removed to open the can, the bond between the two layers is ruptured and the second layer is peeled from the can end 5 -with the tape, exposing a clean pour opening.
Brief Description of the Drawing The present invention will be explained in greater detail hereinafter with reference to the accompanying drawing wherein:
Figure 1 is a plan view of a container end assembly including a tape closure illustrating the present invention;
Figure 2 is a vertical sectional view taken along the line 2-2 of Figure l;
Figure 3 is a second vertical sectional view corresponding to that of Figure 2 showing the closure in the open position;
Figure ~ is a detail fragmentary vertical sectional view through the closure and can end of the 20 present invention with the closure in the open position;
Figure 5 is a fragmentary plan view of the container end with the closure in the open positioni ~i(Jure 6 is a plan view oL- a Eurttler em~o(ii.ment of the tape closure oE the present invention;
Figure 7 is a vertical sectional view taken along the line 7-7 of Figure 6; and Figure 8 is a second vertical sectional view showing the closure during removal of the tape.
Detailed Description Referring now to the drawing there is illustrated a preferred embodiment of a container end assembly accordil-g to the present invention and generally des:ignated by the reference numeral 10.
~2~7~3 The present invention can be ut;lized with can ends for containers of material which will not be pressuri~ed and in such applications only an exterior tape adhered to the container end circumjacent the pour opening would be utilized. The illustrated assembly includes a tape closure utilizing an exterior tape and an interior tape which is suitable for all applications.
The container end assembly 10 comprises a container or can end 12 formed o~ a Elexible metallic sheet material or metal which takes a permanent set when folded an~ has a circular flange 14 about the periphery for attachment to an end of a cylinclrical container. The can end 12 has a generally U-shape cut 15 defining three sides ~)l arl opc?rling in ~he container end fo~ming the l?our opening 15. On the fourth side of the pour opening 15, a tongue 16 is forlned which extends Erom the side into the pour opening to hold the tape, upon opening of the closure, in a position away from the pour opening and to restrict the possibility of entirely separating the tape closure from the can end upon opening the same such that the closure does not become separated ~rom the can and not properly deposited or disposed of by the person opening the container. The tongue-lilce portion 16 is described and claimed in U.S.
patent No. 4,108,330, assigned to the assignee o~ this invention.
Additionally, as taught in U.S. patent No.
3,990,603, assigned to the assignee o~ this application, the pour opening 15 preferably includes a relatively narrow arcuate portion 17 extending toward the flange 14 of the 30 can end 1~. The portion 17 will be the first part of the illustrated pour opening uncovered as the tape is being peeled from the can. When this occurs, the portion 17 permits a small area o~ the interior tape to be drawn against the edge of the opening 15 and it will hegin to tear along the edges of the portion 17 and progress along the remaining portions of the three sides of the opening 15 to neatly tear the interior sheet material covering the
2~
pour opening lS.
The can end 12 ~ay be Eormed of a metal which is subject to corrosion and thus is provided with a protective layer to restrict corrosion and maintain its appearance.
5 In this respect the can end 12 is provided with a Eirst exterior coating deEining a first layer 19 which is applied to the material forming the can end and is cured. A second coating or layer 20 is then applied to the layer 19 and is suitably cured to Eorm a bond between the first layer 19 10 and the second layer 20. In current practice in the industry a Eirst interior coating 21 is applied to the interior surface of the can end and a top coating 22 is applied over the coating 21 in a similar manner by applying the first coating and curing the same and then applying the 15 second coating 22 and curing the same. A single interior coating would be suEficient with a coating defining a layer having the protective properties and adhesion required while being ductile enou~h not to crack or fracture during the can end making and sealing operations.
An exterior tape 24 is adhered to the exterior ~iu~Eace o~ the can en~l 12 in a position circulnjacent an~
completely covering the pour opening 15. The tape 24 comprises a backing 25 having coated on one ~urEace thereoE
an adhesive 26 which adheres tightly to the backing 25 and 25 in the presence of heat and pressure bonds the backing 25 securely to the exterior layer 20 of the can end. The adhesive 26 forms a bond to the external top layer 20, having greater shear and peel strength then the bond between the top layer 20 and a first layer 19. An adhesive 30 bond is made to the can end 12 about the pour opening 15 and has a peripheral pattern such that at one end of the pour opening 15 adjacent the Elange 14 the peripheral edges oE the adhesive 26, where it is bonded to the layer 20, converge to a point 28. This pattern is such that the peeling force applied to the tape 24 is concentrated initial]y on a small area, as at the point 28, to aEEo~d the initial fracture o~ the outer second layer 20.
~2;~t~ 3 Continued peeling oE the tape rernoves the layer 20 bonded to the adhesive 26 from the layer 19.
The container end assemhly 10 also includes an interior sheet material 29 comprising a thin transparent 5 sheet material 30 havin~ an adhesive layer 31 which material is firmly adhered to the inner surEace of the can end circumjacent ancl completely covering the opening 15.
Sheet 30 is adhesively secured to the interior top coat 22 ~n~ is a~hesively secured to the opposed adjacent .sur~ace 10 of the exterior tape 24 through the pour opening 15 and to the tongue l6. This inte:rior sheet material 30 can serve to protect the edge oE the can along the cut forming the pour opening 15 ancl the tongue 16 from the content.s of the container.
In the example illustrated in the ~rawing it is a1..so seen that an opening 34 is .Eormed in the backing 25 and the adhesive 26 of the exterior tape in the area of the pour opening 15. Through this opening 34, the backing 25 may be pressed against the adhesive 31 oE the interior 20 sheet material 30 to seal the opening 34. The bond between the baclcing 25 and the adhesive 31 is sufficient such that upon lifti.ng the exterior -tape 24 by a free end or tab 35 the Eirst thing to happen is a :fracturing of the interior tape 30 in the area of the opening 34 to provide a small 25 pressure relief apert~lre which will allow a safe and relatively quiet release of the pressure within the container without causing the contents to spray Erom the pour opening.
Upon lifting of the free end 35 of the exterior 30 tape 24 the vent is opened at the hole 34 and then the continued application o~ pressure on the tape 24 will cause a fracture of the secon~ exterior layer 20 at the area 28.
rhen the exterior layer 20 will be peeled with the exterior tape Erom the Eirst coating 19 in the area of the adhesive 35 bond to the layer 20 such that the tape may be easily rernoved Erom the ex~erior of the can end covering the pour opening. As the progressive peeling reaches the arcuate -7- ~2~7~
portion 17 oE the pour opening the interior tape is fractured along the edge of the portion 17 and the bond between the adhesive 31 of the in-terior tape and the adhesive 26 o the exterior tape will cause the interio~
5 tape to continue to tear along the edges oE the pour opening 15. The exterior tape 24 is removed progressively from the can end by a delamination between the exterior second layer 20 and the first layer 19 on the can end. As the opening of the container progresses the tongue 16 10 begins to fold and folds back across the container end 12.
Since the tongue 16 is sandwiched between the interior and the exterior tapes and is adhered thereto through the coatings the tongue remains secured to the tapes and to t'ne can end 22 at the edge of the pour opening but it is 15 folded, and when folded, stays in its folded position to retain the tape in a position back from the pour opening as illustrated in Figures 3 and 5.
Figure 5 illustrates diagrammatically the fracture line of the exterior layer 20 and shows the 20 exposed first exterior layer 19 and the separated and peeled portion of the exterior layer 20 remains adhered to the adhesive on the backing 25 of the exterior tape 24.
The line oE the Eracture can be noticed by moving a finger nail from the pour opening across the can end surface 25 normal to the direction of the peeling of the tape. Since the separated layer 20 will not self-adhere back to the layer 19 the closure tape 24 cannot be returned to its initial position and adhere to the can end about the opening 15.
Thus, the present invention provides a tape closure for a metal can end Eormed with a pour opening and coatings protecting it against corrosion and deterioration of the appearance o~ the can end in such a manner that the can end may be sealed during transportation and storage and 35 easily opened by the user in a manner to afford a clean, adhesive-free, uncontaminated coating surrounding the pour opening from which the contents may be dispensed.
7~3 The following is an il]ustrative example of a container end assemL31y oE the type described above.
A generally circular steel can end 12 of 0.33 rnm (0.013 inch) thick single reduced tin-free steel was forrned with a generally U-shaped cut 15 to form a pour opening and a tongue 16. The sheet steel forming the can end 12 was coated with an enamel, e.g. epoxy/phenolic resin such as Mobil S-9200~001, available from Mobil Chemical Company of Pittsburgh, Pennsylvania, IJ.S.A~ The layer 19 had a film weight of 14.0 mg per 25.8 square cm (4 square inches) and was baked at 204C. (400F.) for 10 minutes. Coated over the epoxy/phenolic layer 19 was a second layer, e.g. a clear vinyl coating such as Mobil S-4134-025, available from Mobil Chemical Company. The layer 20 had a film Z~eight of 18.0 mg. per 25.9 square cm (~ square inches) and was baked for 10 minutes at a temperature of 179.4C.
(355F ) To this exterior coating 20 was applied the ' f~
Z,~ exterior tape 24 comprising a polycarbonate film backing (Eor example "Merlon 700" resin from Mobay Corporation of Pittsburgh, Pennsylvania) having a thickness of about 5 mils (130 micrometers) and having a linear thermoplastic polyurethane adhesive, such as that designated "Texin 480F"
(which is commercially available Erom Mobay Corporation) and "Estane 58277" (which is commercially available from .Y. Goodrich Company) coated thereon.
The exterior tape 24 was adhered to the exterior layer and can end by applying the tape circumjacent the pour opening 15 and adhering the same in the presence of heat at a temperature of ~etween 162 to 218C. (325 to 425F.) under a pressure of 275790 to 620528 Pascals (40 to 9() psi).
~ `he interior surface of the can end 12 is preferably coated with an enamel, e.g. epoxy/phenolic resin as was the exterior coat 19, and a second coating to Eorm a second layer of e.g. a clear vinyl layer such as the layer 20 may also be applied. Alternatively a single layer may be ~ G~e.~ot~s t~ .rk ~;~Sfl~,~7~3 g applied to the interior surfacs oE the sheet material which offers corrosion protection and adhesion to the sheet material while heing ductile enough when cured to avoid fracture or cracking during the Eormation of the can end.
An example is a dispersion vinyl coating such as Mobil S9434-037 (available from Mobil Chemical Company).
To this interior coatlng can be applied an interior sheet material 29 comprising a flexible t~ansparent sheet materia] including a plastic film such as polyethylene terephthalate, polyvinylchloride (unplasticized), composite films comprising a layer of polyethyleneterephthalate and a layer of polyethylene terephthalate/polyethyleneisophthalate copolymer (with respe~c~ive mono~ne~ ratlos ranging froln 60/40 to 80/20), and films derived Erom a graEt copolymer comprising acry]on;trile/methylmethacrylate copolymer grafteA onto an acrylonitrile/butadiene copolymer backbone. A particularly useful graft copolymer is formed by graft polymeri~ing acrylonitrile (73-77 parts by wt.) and methylmethacrylate (23-27 parts by wt.) in the presence of 8 to lO parts by wt. o-E an acrylonitrile/butadiene copolymer (70% by wt.
derived from butadiene).
The adhesive layer 31 on the interior sheet material 29 is preferably less than about lO0 micrometers in thickness and is firmly anchored to the backing material. The adhesive must provide a bond of suficient strength between the exterior film material 24 and the lnterior sheet material 29 such that when the exterior flexible film is stripped back, the interior sheet material is cleanly removed in the area of the pour opening.
Suitable adhesives provide a means of attachment of the exterior flexible film to the interior sheet material which will stand a Eorce of up to 3.9 kg per cm width (22 pounds per sq. in. width) of said exterior flexible film at temperatures from at least 2 to 38C. (35F. to 100F.) without separation of the Elexible film from the interior sheet material~
~Z2Z7~3 The specific adhesive 31 includes a thermoplastic polyurethane adhesive as described hereinabove.
In one embodiment, the interior sheet material 29 comprises a composite plastic film in which one layer thereof sexves as the backing member and the other layer thereof serves as the adhesive. This particular composite film comprises a layer of polyethylene terephthalate (which serves as the backing member) and a layer of polyethylene terephthalate (50-90)/polyethyleneiso-phthalate (50-10)/copolymer (which serves as a heat-sealable adhesive).
The backing 25 of the exterior sheet material may be a flexible film selected from the group consisting of polycarbon-ate, polytetramethylene terephthalate, (e.g., using "Valox*303"
resin from General Electric Corporation), polyamide derived from 6.6 nylon (e.g., using "Zytel*ST 810HS" resin from E. I. duPont deNemours Co.), physical blends of polytetramethylene terephthalate/
polyethylene, physical blends of polytetramethylene terephthalate/
phenoxy7 glycol modified polyethylene terephthalate (e.g. using "Kodar*6763" resin from Eastman Chemical Products, Inc.), polyvinylchloride, polypropylene and films derived from a graft copolymer comprising acrylonitrile/methylmethacrylate copolymer grafted onto an acrylonitrile/butadiene copolymer backbone (e.g.
using "Barex"* resin from Vistron Corporation). Other materials may include thin foil-film composites having a thickness of between 50 micrometers to about 180 micrometers. A preferred material is a polycarbonate film backing (e.g. using "Merlon 700"
resin from Mobay Corporation of Pittsburgh, Pennsylvania) of about 130 micrometers in thickness.
* denotes Trademark , ~,, :~L2~'7~)3 -lOa- 557-2711 The blank metal from which the can ends are formed might be coated with a difEerent lacquer or enamel than the specific epoxy/phenolic resin or vinyl coatings mentioned above.
An example of a different exterior enamel t7~3 coating is an epoxy/urea formaldehyde clear coat such as Mobil 6-6265-034 (available from Mobil Chernical Company~
which may be applied at a film weight of 13 to 14 milligrams per 25.8 square cm (4 square inches) or 0.5 to 0.54 mg/cm2 and baked for 10 minutes at 204C. (400~F.) onto the can end. The important aspect is that the bonding strength of the second layer to the first layer must be high but not exceed the bonding strength between the film backing 25 and its adhesive layer 26 or exceed the bond between the adhesive layer 26 and the exterior second layer 20 such that the peeling of the tape from the can end causes a delamination of the top layer 20 and the first layer 19 to permit removal of the exterior tape.
Referring now to Figures 6 and 7, there is illustrated a further embodiment of a container end assembly, generally designated by the reference numeral 40.
The container end assembly 40 comprises a container end or can end 42 formed of a metallic sheet material having a circular flange 44 and a pour opening 45 and a vent opening 46.
The can end 42 is formed of electro-tin plate steel (ETP) or tin-free steel (TFS) and is provided with an exterior protective layer 47. The coating for use on the ETP can end is a epoxy/urea formaldehyde as designated by coating 5-6265-034 of Mobil Chemical Company coated at 3.6 milligrams per 6.45 square cm (square inch) or 0.55 milligrams per cm squared and baked 10 minutes at 204C.
(400F.).
An example of the layer 47 for the tin-free steel end 42 is an enamel layer identified as 51325-016 available from Mobil Chemical Company, of Pittsburg, Pennsylvania which is a vinyl chloride vinyl acetate copolymer, which is coated at 2.5 milligrams per 6.45 square cm (square inch) or 0.39 milligrams per centimeter squared and baked 10 minutes at 179C (355F).
An exterior tape 48 is adhered to the exterior layer 47, and comprises a backing 49 bonded circumjacent -12- ~2~7~
and completely covering the pour opening 45 and vent opening 46. ~ ~ree end 50 of the tape 48 aEfords a tab for grasping to remove the tape. The adhesive bond made between a thermoplastic adhesive 51 coated on the tape hacking 49 and the layer 47, is patterned to cover the area of the tape surrounding the pour opening 45 and the vent opening 46 and the bond terminates along converging edges il]ustrated at 52 adjacent to the tab 50. This pattern is such that the peeling Eorce applied to the tape 48 is concentrated initially on a small area where the edges 52 conver~e to aEEord the initial fracture oE the layer 47.
AEter fracturing the layer 47 the tape is removed from the can end 42 by continually rupturing the bond between layer 47 and the can end 42 since the adhesive bond between the tape and the layer 47 has greater peel strength than the bond between the layer 47 and the can end and the layer 47 has greater integrity than the bond between the layer 47 and the su~Eace immediately beneath the layer 47.
In the embodiment of Figures 6, 7 and 8 an interior tape 29 is used to protect the exposed can edges at the openings ~5 and 46 and is similar to the sheet material described above. The interior surface of the can end 42 is coated with coatings 21 and 22 to protect the can end and the tape backing 30 is adhered to the layer 22 by adhesive 31. As described above, when removing the tape 48 the interior tape 29 will be torn in the area of the vent opening 46 and the pour opening 45 where the interior tape 29 is adhered to the exterior tape 48.
It is to be understood that a single layer of ex~erior tape tnay be applied to a can end over the pour opening 15 or 45 when the beverage is not carbonated or under pressure and will provide a suitable seal which is readily removable by peeling the exterior tape as hereinabove described. The exterior tape in a single tape system may thus be detachable from the can end upon opening the closure system.
pour opening lS.
The can end 12 ~ay be Eormed of a metal which is subject to corrosion and thus is provided with a protective layer to restrict corrosion and maintain its appearance.
5 In this respect the can end 12 is provided with a Eirst exterior coating deEining a first layer 19 which is applied to the material forming the can end and is cured. A second coating or layer 20 is then applied to the layer 19 and is suitably cured to Eorm a bond between the first layer 19 10 and the second layer 20. In current practice in the industry a Eirst interior coating 21 is applied to the interior surface of the can end and a top coating 22 is applied over the coating 21 in a similar manner by applying the first coating and curing the same and then applying the 15 second coating 22 and curing the same. A single interior coating would be suEficient with a coating defining a layer having the protective properties and adhesion required while being ductile enou~h not to crack or fracture during the can end making and sealing operations.
An exterior tape 24 is adhered to the exterior ~iu~Eace o~ the can en~l 12 in a position circulnjacent an~
completely covering the pour opening 15. The tape 24 comprises a backing 25 having coated on one ~urEace thereoE
an adhesive 26 which adheres tightly to the backing 25 and 25 in the presence of heat and pressure bonds the backing 25 securely to the exterior layer 20 of the can end. The adhesive 26 forms a bond to the external top layer 20, having greater shear and peel strength then the bond between the top layer 20 and a first layer 19. An adhesive 30 bond is made to the can end 12 about the pour opening 15 and has a peripheral pattern such that at one end of the pour opening 15 adjacent the Elange 14 the peripheral edges oE the adhesive 26, where it is bonded to the layer 20, converge to a point 28. This pattern is such that the peeling force applied to the tape 24 is concentrated initial]y on a small area, as at the point 28, to aEEo~d the initial fracture o~ the outer second layer 20.
~2;~t~ 3 Continued peeling oE the tape rernoves the layer 20 bonded to the adhesive 26 from the layer 19.
The container end assemhly 10 also includes an interior sheet material 29 comprising a thin transparent 5 sheet material 30 havin~ an adhesive layer 31 which material is firmly adhered to the inner surEace of the can end circumjacent ancl completely covering the opening 15.
Sheet 30 is adhesively secured to the interior top coat 22 ~n~ is a~hesively secured to the opposed adjacent .sur~ace 10 of the exterior tape 24 through the pour opening 15 and to the tongue l6. This inte:rior sheet material 30 can serve to protect the edge oE the can along the cut forming the pour opening 15 ancl the tongue 16 from the content.s of the container.
In the example illustrated in the ~rawing it is a1..so seen that an opening 34 is .Eormed in the backing 25 and the adhesive 26 of the exterior tape in the area of the pour opening 15. Through this opening 34, the backing 25 may be pressed against the adhesive 31 oE the interior 20 sheet material 30 to seal the opening 34. The bond between the baclcing 25 and the adhesive 31 is sufficient such that upon lifti.ng the exterior -tape 24 by a free end or tab 35 the Eirst thing to happen is a :fracturing of the interior tape 30 in the area of the opening 34 to provide a small 25 pressure relief apert~lre which will allow a safe and relatively quiet release of the pressure within the container without causing the contents to spray Erom the pour opening.
Upon lifting of the free end 35 of the exterior 30 tape 24 the vent is opened at the hole 34 and then the continued application o~ pressure on the tape 24 will cause a fracture of the secon~ exterior layer 20 at the area 28.
rhen the exterior layer 20 will be peeled with the exterior tape Erom the Eirst coating 19 in the area of the adhesive 35 bond to the layer 20 such that the tape may be easily rernoved Erom the ex~erior of the can end covering the pour opening. As the progressive peeling reaches the arcuate -7- ~2~7~
portion 17 oE the pour opening the interior tape is fractured along the edge of the portion 17 and the bond between the adhesive 31 of the in-terior tape and the adhesive 26 o the exterior tape will cause the interio~
5 tape to continue to tear along the edges oE the pour opening 15. The exterior tape 24 is removed progressively from the can end by a delamination between the exterior second layer 20 and the first layer 19 on the can end. As the opening of the container progresses the tongue 16 10 begins to fold and folds back across the container end 12.
Since the tongue 16 is sandwiched between the interior and the exterior tapes and is adhered thereto through the coatings the tongue remains secured to the tapes and to t'ne can end 22 at the edge of the pour opening but it is 15 folded, and when folded, stays in its folded position to retain the tape in a position back from the pour opening as illustrated in Figures 3 and 5.
Figure 5 illustrates diagrammatically the fracture line of the exterior layer 20 and shows the 20 exposed first exterior layer 19 and the separated and peeled portion of the exterior layer 20 remains adhered to the adhesive on the backing 25 of the exterior tape 24.
The line oE the Eracture can be noticed by moving a finger nail from the pour opening across the can end surface 25 normal to the direction of the peeling of the tape. Since the separated layer 20 will not self-adhere back to the layer 19 the closure tape 24 cannot be returned to its initial position and adhere to the can end about the opening 15.
Thus, the present invention provides a tape closure for a metal can end Eormed with a pour opening and coatings protecting it against corrosion and deterioration of the appearance o~ the can end in such a manner that the can end may be sealed during transportation and storage and 35 easily opened by the user in a manner to afford a clean, adhesive-free, uncontaminated coating surrounding the pour opening from which the contents may be dispensed.
7~3 The following is an il]ustrative example of a container end assemL31y oE the type described above.
A generally circular steel can end 12 of 0.33 rnm (0.013 inch) thick single reduced tin-free steel was forrned with a generally U-shaped cut 15 to form a pour opening and a tongue 16. The sheet steel forming the can end 12 was coated with an enamel, e.g. epoxy/phenolic resin such as Mobil S-9200~001, available from Mobil Chemical Company of Pittsburgh, Pennsylvania, IJ.S.A~ The layer 19 had a film weight of 14.0 mg per 25.8 square cm (4 square inches) and was baked at 204C. (400F.) for 10 minutes. Coated over the epoxy/phenolic layer 19 was a second layer, e.g. a clear vinyl coating such as Mobil S-4134-025, available from Mobil Chemical Company. The layer 20 had a film Z~eight of 18.0 mg. per 25.9 square cm (~ square inches) and was baked for 10 minutes at a temperature of 179.4C.
(355F ) To this exterior coating 20 was applied the ' f~
Z,~ exterior tape 24 comprising a polycarbonate film backing (Eor example "Merlon 700" resin from Mobay Corporation of Pittsburgh, Pennsylvania) having a thickness of about 5 mils (130 micrometers) and having a linear thermoplastic polyurethane adhesive, such as that designated "Texin 480F"
(which is commercially available Erom Mobay Corporation) and "Estane 58277" (which is commercially available from .Y. Goodrich Company) coated thereon.
The exterior tape 24 was adhered to the exterior layer and can end by applying the tape circumjacent the pour opening 15 and adhering the same in the presence of heat at a temperature of ~etween 162 to 218C. (325 to 425F.) under a pressure of 275790 to 620528 Pascals (40 to 9() psi).
~ `he interior surface of the can end 12 is preferably coated with an enamel, e.g. epoxy/phenolic resin as was the exterior coat 19, and a second coating to Eorm a second layer of e.g. a clear vinyl layer such as the layer 20 may also be applied. Alternatively a single layer may be ~ G~e.~ot~s t~ .rk ~;~Sfl~,~7~3 g applied to the interior surfacs oE the sheet material which offers corrosion protection and adhesion to the sheet material while heing ductile enough when cured to avoid fracture or cracking during the Eormation of the can end.
An example is a dispersion vinyl coating such as Mobil S9434-037 (available from Mobil Chemical Company).
To this interior coatlng can be applied an interior sheet material 29 comprising a flexible t~ansparent sheet materia] including a plastic film such as polyethylene terephthalate, polyvinylchloride (unplasticized), composite films comprising a layer of polyethyleneterephthalate and a layer of polyethylene terephthalate/polyethyleneisophthalate copolymer (with respe~c~ive mono~ne~ ratlos ranging froln 60/40 to 80/20), and films derived Erom a graEt copolymer comprising acry]on;trile/methylmethacrylate copolymer grafteA onto an acrylonitrile/butadiene copolymer backbone. A particularly useful graft copolymer is formed by graft polymeri~ing acrylonitrile (73-77 parts by wt.) and methylmethacrylate (23-27 parts by wt.) in the presence of 8 to lO parts by wt. o-E an acrylonitrile/butadiene copolymer (70% by wt.
derived from butadiene).
The adhesive layer 31 on the interior sheet material 29 is preferably less than about lO0 micrometers in thickness and is firmly anchored to the backing material. The adhesive must provide a bond of suficient strength between the exterior film material 24 and the lnterior sheet material 29 such that when the exterior flexible film is stripped back, the interior sheet material is cleanly removed in the area of the pour opening.
Suitable adhesives provide a means of attachment of the exterior flexible film to the interior sheet material which will stand a Eorce of up to 3.9 kg per cm width (22 pounds per sq. in. width) of said exterior flexible film at temperatures from at least 2 to 38C. (35F. to 100F.) without separation of the Elexible film from the interior sheet material~
~Z2Z7~3 The specific adhesive 31 includes a thermoplastic polyurethane adhesive as described hereinabove.
In one embodiment, the interior sheet material 29 comprises a composite plastic film in which one layer thereof sexves as the backing member and the other layer thereof serves as the adhesive. This particular composite film comprises a layer of polyethylene terephthalate (which serves as the backing member) and a layer of polyethylene terephthalate (50-90)/polyethyleneiso-phthalate (50-10)/copolymer (which serves as a heat-sealable adhesive).
The backing 25 of the exterior sheet material may be a flexible film selected from the group consisting of polycarbon-ate, polytetramethylene terephthalate, (e.g., using "Valox*303"
resin from General Electric Corporation), polyamide derived from 6.6 nylon (e.g., using "Zytel*ST 810HS" resin from E. I. duPont deNemours Co.), physical blends of polytetramethylene terephthalate/
polyethylene, physical blends of polytetramethylene terephthalate/
phenoxy7 glycol modified polyethylene terephthalate (e.g. using "Kodar*6763" resin from Eastman Chemical Products, Inc.), polyvinylchloride, polypropylene and films derived from a graft copolymer comprising acrylonitrile/methylmethacrylate copolymer grafted onto an acrylonitrile/butadiene copolymer backbone (e.g.
using "Barex"* resin from Vistron Corporation). Other materials may include thin foil-film composites having a thickness of between 50 micrometers to about 180 micrometers. A preferred material is a polycarbonate film backing (e.g. using "Merlon 700"
resin from Mobay Corporation of Pittsburgh, Pennsylvania) of about 130 micrometers in thickness.
* denotes Trademark , ~,, :~L2~'7~)3 -lOa- 557-2711 The blank metal from which the can ends are formed might be coated with a difEerent lacquer or enamel than the specific epoxy/phenolic resin or vinyl coatings mentioned above.
An example of a different exterior enamel t7~3 coating is an epoxy/urea formaldehyde clear coat such as Mobil 6-6265-034 (available from Mobil Chernical Company~
which may be applied at a film weight of 13 to 14 milligrams per 25.8 square cm (4 square inches) or 0.5 to 0.54 mg/cm2 and baked for 10 minutes at 204C. (400~F.) onto the can end. The important aspect is that the bonding strength of the second layer to the first layer must be high but not exceed the bonding strength between the film backing 25 and its adhesive layer 26 or exceed the bond between the adhesive layer 26 and the exterior second layer 20 such that the peeling of the tape from the can end causes a delamination of the top layer 20 and the first layer 19 to permit removal of the exterior tape.
Referring now to Figures 6 and 7, there is illustrated a further embodiment of a container end assembly, generally designated by the reference numeral 40.
The container end assembly 40 comprises a container end or can end 42 formed of a metallic sheet material having a circular flange 44 and a pour opening 45 and a vent opening 46.
The can end 42 is formed of electro-tin plate steel (ETP) or tin-free steel (TFS) and is provided with an exterior protective layer 47. The coating for use on the ETP can end is a epoxy/urea formaldehyde as designated by coating 5-6265-034 of Mobil Chemical Company coated at 3.6 milligrams per 6.45 square cm (square inch) or 0.55 milligrams per cm squared and baked 10 minutes at 204C.
(400F.).
An example of the layer 47 for the tin-free steel end 42 is an enamel layer identified as 51325-016 available from Mobil Chemical Company, of Pittsburg, Pennsylvania which is a vinyl chloride vinyl acetate copolymer, which is coated at 2.5 milligrams per 6.45 square cm (square inch) or 0.39 milligrams per centimeter squared and baked 10 minutes at 179C (355F).
An exterior tape 48 is adhered to the exterior layer 47, and comprises a backing 49 bonded circumjacent -12- ~2~7~
and completely covering the pour opening 45 and vent opening 46. ~ ~ree end 50 of the tape 48 aEfords a tab for grasping to remove the tape. The adhesive bond made between a thermoplastic adhesive 51 coated on the tape hacking 49 and the layer 47, is patterned to cover the area of the tape surrounding the pour opening 45 and the vent opening 46 and the bond terminates along converging edges il]ustrated at 52 adjacent to the tab 50. This pattern is such that the peeling Eorce applied to the tape 48 is concentrated initially on a small area where the edges 52 conver~e to aEEord the initial fracture oE the layer 47.
AEter fracturing the layer 47 the tape is removed from the can end 42 by continually rupturing the bond between layer 47 and the can end 42 since the adhesive bond between the tape and the layer 47 has greater peel strength than the bond between the layer 47 and the can end and the layer 47 has greater integrity than the bond between the layer 47 and the su~Eace immediately beneath the layer 47.
In the embodiment of Figures 6, 7 and 8 an interior tape 29 is used to protect the exposed can edges at the openings ~5 and 46 and is similar to the sheet material described above. The interior surface of the can end 42 is coated with coatings 21 and 22 to protect the can end and the tape backing 30 is adhered to the layer 22 by adhesive 31. As described above, when removing the tape 48 the interior tape 29 will be torn in the area of the vent opening 46 and the pour opening 45 where the interior tape 29 is adhered to the exterior tape 48.
It is to be understood that a single layer of ex~erior tape tnay be applied to a can end over the pour opening 15 or 45 when the beverage is not carbonated or under pressure and will provide a suitable seal which is readily removable by peeling the exterior tape as hereinabove described. The exterior tape in a single tape system may thus be detachable from the can end upon opening the closure system.
Claims (20)
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:
1. A container end assembly comprising:
a container end formed of metallic material having an exterior surface and an interior surface and being formed with a pour opening;
a polymeric layer over said exterior surface of said end; and a tape bonded by an adhesive to an area of the exterior surface of said layer circumjacent and covering said pour opening, said adhesive forming a bond between said tape and said layer, the bond made between said tape and said layer has greater strength than the bond between said layer and the surface supporting said layer, causing said layer to break and peel from said end upon removal of the tape from the container end.
a container end formed of metallic material having an exterior surface and an interior surface and being formed with a pour opening;
a polymeric layer over said exterior surface of said end; and a tape bonded by an adhesive to an area of the exterior surface of said layer circumjacent and covering said pour opening, said adhesive forming a bond between said tape and said layer, the bond made between said tape and said layer has greater strength than the bond between said layer and the surface supporting said layer, causing said layer to break and peel from said end upon removal of the tape from the container end.
2. A container end assembly according to claim 1 wherein the container end has at least one layer over the exterior metal surface beneath said polymeric layer which one layer is bonded to said metal surface more firmly than the said polymeric layer is bonded to said one layer.
3. A container end assembly according to claim 2 wherein said one layer is an epoxy/phenolic coating and said polymeric layer is a clear vinyl coating.
4. A container end assembly according to claim 1 wherein said end has a layer of metal plated on said end beneath said polymeric layer to which said polymeric layer is bonded less firmly than said tape is bonded to said polymeric layer.
5. A container end assembly according to claim 1 wherein the tape comprises a backing of polycarbonate resin to which a thermoplastic adhesive is adhered
6. A container end assembly according to claim 2 wherein the tape comprises a backing of polycarbonate resin to which a thermoplastic adhesive is adhered.
7. A container end assembly according to claim 3 wherein the tape comprises a backing of polycarbonate resin to which a thermoplastic adhesive is adhered.
8. A container end assembly according to claim 4 wherein the tape comprises a backing of polycarbonate resin to which a thermoplastic adhesive is adhered.
9. A container end assembly according to claim 1 wherein the exterior tape backing comprises a flexible film selected from the group consisting of polycarbonate, polytetramethylene terephthalate, polyamide derived from 6-6 nylon, physical blends of polytetramethylene terephthalate/polyethylene, physical blends of polytetramethylene terephthalate/phenoxy, glycol modified polyethylene terephthalate, polyvinylchloride, polypropylene, and films derived from a graft copolymer comprising acrylonitrile/methylmethacrylate copolymer grafted onto an acrylonitrile/butadiene copolymer backbone, or thin foil-film composites.
10. A container end assembly according to claim 2 wherein the exterior tape backing comprises a flexible film selected from the group consisting of polycarbonate, polytetramethylene terephthalate, polyamide derived from 6-6 nylon, physical blends of polytetramethylene terephthalate/polyethylene, physical blends of polytetramethylene terephthalate/phenoxy, glycol modified polyethylene terephthalate, polyvinylchloride, polypropylene, and films derived from a graft copolymer comprising acrylonitrile/methylmethacrylate copolymer grafted onto an acrylonitrile/butadiene copolymer backbone, or thin foil-film composites.
11. A container end assembly according to claim 3 wherein the exterior tape backing comprises a flexible film selected from the group consisting of polycarbonate, polytetramethylene terephthalate, polyamide derived from 6-6 nylon, physical blends of polytetramethylene terephthalate/polyethylene, physical blends of polytetramethylene terephthalate/phenoxy, glycol modified polyethylene terephthalate, polyvinylchloride, polypropylene, and films derived from a graft copolymer comprising acrylonitrile/methylmethacrylate copolymer grafted onto an acrylonitrile/butadiene copolymer backbone, or thin foil-film composites.
12. A container end assembly according to claim 4 wherein the exterior tape backing comprises a flexible film selected from the group consisting of polycarbonate, polytetramethylene terephthalate, polyamide derived from 6-6 nylon, physical blends of polytetramethylene terephthalate/polyethylene, physical blends of polytetramethylene terephthalate/phenoxy, glycol modified polyethylene terephthalate, polyvinylchloride, polypropylene, and films derived from a graft copolymer comprising acrylonitrile/methylmethacrylate copolymer grafted onto an acrylonitrile/butadiene copolymer backbone, or thin foil-film composites.
13. A container end assembly according to claim 9 wherein said adhesive is a thermoplastic polyurethane.
14. A container end assembly according to claim 10 wherein said adhesive is a thermoplastic polyurethane.
15. A container end assembly according to claim 11 wherein said adhesive is a thermoplastic polyurethane.
16. A container end assembly according to claim 12 wherein said adhesive is a thermoplastic polyurethane.
17. A container end assembly according to claim 5 wherein said adhesive is a thermoplastic polyurethane.
18. A container end assembly according to Claim 1 wherein said adhesive forming a bond between said tape and said polymeric layer forms a bond which is stronger in shear and tension than the bond between said layer and said surface supporting said layer and said layer is stronger than said bond between said layer and said surface supporting said layer whereby upon peeling of the tape from said container end said layer breaks and delaminates from the end in the area of the adhesive bond to said layer, peeling said layer in said area from said end upon removal of the tape from the container end, and a second interior tape is bonded to at least one protective layer on said interior surface of said end and to said adhesive through said pour opening.
19. A container end assembly according to Claim 2 wherein said adhesive forming a bond between said tape and said polymeric layer forms a bond which is stronger in shear and tension than the bond between said layer and said surface supporting said layer and said layer is stronger than said bond between said layer and said surface supporting said layer whereby upon peeling of the tape from said container end said layer breaks and delaminates from the end in the area of the adhesive bond to said layer, peeling said layer in said area from said end upon removal of the tape from the container end, and a second interior tape is bonded to at least one protective layer on said interior surface of said end and to said adhesive through said pour opening.
20. A container end assembly according to Claim 4 wherein said adhesive forming a bond between said tape and said polymeric layer forms a bond which is stronger in shear and tension than the bond between said layer and said surface supporting said layer and said layer is stronger than said bond between said layer and said surface supporting said layer whereby upon peeling of the tape from said container end said layer breaks and delaminates from the end in the area of the adhesive bond to said layer, peeling said layer in said area from said end upon removal of the tape from the container end, and a second interior tape is bonded to at least one protective layer on said interior surface of said end and to said adhesive through said pour opening.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US45856483A | 1983-01-07 | 1983-01-07 | |
| US458,564 | 1989-12-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1222703A true CA1222703A (en) | 1987-06-09 |
Family
ID=23821270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000444559A Expired CA1222703A (en) | 1983-01-07 | 1984-01-03 | Tape closure for a can end |
Country Status (14)
| Country | Link |
|---|---|
| EP (1) | EP0113698B1 (en) |
| JP (1) | JPS59163147A (en) |
| KR (1) | KR840007086A (en) |
| AT (1) | ATE26426T1 (en) |
| AU (1) | AU2311284A (en) |
| BR (1) | BR8400044A (en) |
| CA (1) | CA1222703A (en) |
| DE (1) | DE3463025D1 (en) |
| DK (1) | DK2984A (en) |
| ES (2) | ES285905Y (en) |
| IL (1) | IL70631A (en) |
| NO (1) | NO840026L (en) |
| NZ (1) | NZ206765A (en) |
| ZA (1) | ZA84138B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4853267A (en) * | 1984-02-09 | 1989-08-01 | Minnesota Mining And Manufacturing Company | Easy open closure system |
| US4537327A (en) * | 1984-09-13 | 1985-08-27 | Minnesota Mining And Manufacturing Company | Tape closure for a can end |
| SE454685B (en) * | 1985-06-12 | 1988-05-24 | Tetra Pak Ab | PACKAGING CONTAINER OPENING DEVICE |
| US4836507A (en) * | 1987-08-10 | 1989-06-06 | E. I. Du Pont De Nemours And Company | Aramid staple and pulp prepared by spinning |
| SE515741C2 (en) * | 2000-02-11 | 2001-10-01 | Emballator Ulricehamns Bleck A | Cover for container and container |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3355059A (en) * | 1964-05-13 | 1967-11-28 | American Can Co | Laminate with severable portion |
| US3671356A (en) * | 1970-06-08 | 1972-06-20 | Continental Can Co | Method of forming a peelable seal between propylene polymer and a carboxylated polypropylene coated surface |
| US4029033A (en) * | 1974-09-18 | 1977-06-14 | The Continental Group, Inc. | Convenience opening of containers for liquid products |
| US3990603A (en) * | 1975-12-09 | 1976-11-09 | Minnesota Mining And Manufacturing Company | Easy open closure system |
| US4108330A (en) * | 1977-06-08 | 1978-08-22 | Minnesota Mining And Manufacturing Company | Easy open container end assembly |
| US4215791A (en) * | 1979-08-06 | 1980-08-05 | Minnesota Mining And Manufacturing Company | Easy open closure system |
-
1984
- 1984-01-03 CA CA000444559A patent/CA1222703A/en not_active Expired
- 1984-01-04 DK DK2984A patent/DK2984A/en not_active Application Discontinuation
- 1984-01-04 ES ES1984285905U patent/ES285905Y/en not_active Expired
- 1984-01-04 NO NO840026A patent/NO840026L/en unknown
- 1984-01-06 IL IL70631A patent/IL70631A/en not_active IP Right Cessation
- 1984-01-06 AT AT84300099T patent/ATE26426T1/en not_active IP Right Cessation
- 1984-01-06 AU AU23112/84A patent/AU2311284A/en not_active Abandoned
- 1984-01-06 DE DE8484300099T patent/DE3463025D1/en not_active Expired
- 1984-01-06 BR BR8400044A patent/BR8400044A/en unknown
- 1984-01-06 ZA ZA84138A patent/ZA84138B/en unknown
- 1984-01-06 NZ NZ206765A patent/NZ206765A/en unknown
- 1984-01-06 EP EP84300099A patent/EP0113698B1/en not_active Expired
- 1984-01-06 JP JP59000724A patent/JPS59163147A/en active Pending
- 1984-01-07 KR KR1019840000045A patent/KR840007086A/en not_active Application Discontinuation
-
1985
- 1985-09-02 ES ES1985288904U patent/ES288904Y/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NZ206765A (en) | 1986-08-08 |
| AU2311284A (en) | 1984-07-12 |
| ES285905U (en) | 1986-03-01 |
| DK2984D0 (en) | 1984-01-04 |
| JPS59163147A (en) | 1984-09-14 |
| EP0113698B1 (en) | 1987-04-08 |
| KR840007086A (en) | 1984-12-05 |
| IL70631A0 (en) | 1984-04-30 |
| ES288904Y (en) | 1987-03-01 |
| DE3463025D1 (en) | 1987-05-14 |
| NO840026L (en) | 1984-07-09 |
| DK2984A (en) | 1984-07-08 |
| IL70631A (en) | 1987-01-30 |
| ATE26426T1 (en) | 1987-04-15 |
| EP0113698A1 (en) | 1984-07-18 |
| ZA84138B (en) | 1985-08-28 |
| BR8400044A (en) | 1984-08-14 |
| ES288904U (en) | 1986-06-16 |
| ES285905Y (en) | 1986-10-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |