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
  • B65D51/00—Closures not otherwise provided for
  • B65D51/18—Arrangements of closures with protective outer cap-like covers or of two or more co-operating closures
  • B65D51/20—Caps, lids, or covers co-operating with an inner closure arranged to be opened by piercing, cutting, or tearing
• • 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
  • B65D43/00—Lids or covers for rigid or semi-rigid containers
  • B65D43/02—Removable lids or covers
  • B65D43/0202—Removable lids or covers without integral tamper element
  • B65D43/0214—Removable lids or covers without integral tamper element secured only by friction or gravity
  • B65D43/022—Removable lids or covers without integral tamper element secured only by friction or gravity only on the inside, or a part turned to the inside, of the mouth of the container
• • 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
  • B65D2201/00—Means or constructions for testing or controlling the contents
• • 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
  • B65D2251/00—Details relating to container closures
  • B65D2251/0003—Two or more closures
  • B65D2251/0006—Upper closure
  • B65D2251/0018—Upper closure of the 43-type
• • 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
  • B65D2251/00—Details relating to container closures
  • B65D2251/0003—Two or more closures
  • B65D2251/0068—Lower closure
  • B65D2251/0093—Membrane
• • 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
  • B65D2543/00—Lids or covers essentially for box-like containers
  • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
  • B65D2543/00018—Overall construction of the lid
  • B65D2543/00064—Shape of the outer periphery
  • B65D2543/00074—Shape of the outer periphery curved
  • B65D2543/00092—Shape of the outer periphery curved circular
• • 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
  • B65D2543/00—Lids or covers essentially for box-like containers
  • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
  • B65D2543/00018—Overall construction of the lid
  • B65D2543/00259—Materials used
  • B65D2543/00277—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
  • B65D2543/00—Lids or covers essentially for box-like containers
  • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
  • B65D2543/00435—Lids secured to an intermediate ring or like annular member fixed to the container mouth
• • 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
  • B65D2543/00—Lids or covers essentially for box-like containers
  • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
  • B65D2543/00444—Contact between the container and the lid
  • B65D2543/00481—Contact between the container and the lid on the inside or the outside of the container
  • B65D2543/0049—Contact between the container and the lid on the inside or the outside of the container on the inside, or a part turned to the inside of the mouth of the container
  • B65D2543/00509—Cup
• • 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
  • B65D2543/00—Lids or covers essentially for box-like containers
  • B65D2543/00009—Details of lids or covers for rigid or semi-rigid containers
  • B65D2543/00444—Contact between the container and the lid
  • B65D2543/00481—Contact between the container and the lid on the inside or the outside of the container
  • B65D2543/00537—Contact between the container and the lid on the inside or the outside of the container on the outside, or a part turned to the outside of the mouth of the container
  • B65D2543/00546—NO contact

Definitions

• This invention relates to container closure.
• the present invention shall be referred to throughout this specification in the context of improvements in the sealing of containers such as cans. However, it is also envisaged that the present invention may be used in other applications.
• a conventional can that is designed to be reusable once opened is the ring-lid-foil (RLF) type can.
• RLF ring-lid-foil
• One such can is disclosed in New Zealand Patent No. 218651 which utilises a thin opaque sheet of aluminium foil to seal the aperture of the can.
• these cans have a replaceable lid which can be used to seal the container once the foil has been removed.
• a typical method of making sealed RLF cans is to have a continuous sheet of aluminium passed over a ring/lid assembly.
• a former pushes the aluminium foil into the various channels of the ring lid assembly.
• the nature of the aluminium foil is such that once bent into these channels it holds its shape and hence position relative to the ring.
• the assembly process then involves the addition of sealing compound into one of the channels of the ring.
• the rim of a can body is placed onto the sealing compound.
• the outer flange of the ring is folded and crimped around the rim of the can to provide an airtight seal.
• the material is placed into the can body. If the material is milk powder then this is often packed in a modified atmosphere.
• the base of the can is ' placed onto the body of the can, the contents of the can vacuumed and the can sealed.
• the method by which the disks are made is expensive compared to the process by which a continuous film of aluminium foil is produced.
• the plastics materials has to be cut to shape if not already injection moulded. Because of the rigid nature of the disk it has to be thermoformed to the contours of the ring. Finally, the disk has to be placed on top of the ring/lid assembly.
• Another problem with the thick clear film is the difficulty in accessing the contents within the can as a thick film can be difficult for a consumer to break.
• Yet another disadvantage of using the thick film is that the film only stays in position through the mechanical process of crimping. This does not allow the ring lid assemblies to be stored in the same manner as RLF assemblies with aluminium foil. Therefore, the assembly of the ring lid disk can only occur as part of the can making process which slows the process down considerably. It is believed that, in a number of can making establishments, this process is manually performed - which is highly inefficient and costly.
• a method of providing a seal for a container including a flexible film having a degree of visual transparency, the method characterised by the steps of
• a seal for a container said seal including a ring and a flexible film adhered to the ring by the provision of adhesive between the ring and the film.
• a can including a seal substantially as described above.
• the container will now be referred to throughout this specification as being a can.
• the principles of the present invention can apply to containers having a different construction from conventional cans.
• the container may be a box-like structure, or may be made from materials other than conventional steel.
• the ring will be, in preferred embodiments, of a similar construction to that used in conventional can assemblies.
• the ring may be any device that provides an attachment mechanism to the can body and an aperture for access to the contents of the can.
• the ring is presented to the film with the lid in place as in the conventional RLF assemblies. It should be appreciated however that in some embodiments of the present invention the lid need not be provided at this stage, or at any other stage. For example, it may be desired only to have a seal in the form of a film rather than an additional reusable lid.
• the film may be any film which has the aforementioned properties.
• the film has sufficient flexibility that it can be readily rolled and thus be used in a similar manner to which aluminium foil is used. Usually this will be a film that is thinner than the thick clear film previously used.
• film in preferred embodiments is made of plastics material, this is not necessarily the case and it should be appreciated that principles of the present invention could apply to film made of other materials having the required properties.
• the thickness of the film will be in the order of approximately 100 microns. Other thicknesses of film are of course envisaged. A typical range is 20-200 microns.
• the degree of visual transparency of the film can vary according to various requirements of the manufacturer. Although in preferred embodiments the film is fully transparent, this need not be necessarily so. For example, the film could have "windows" with opaque areas and transparent areas. This may be the result of areas of different materials, and/or as a result of a pigmenting or printing process.
• the film may be translucent, having a degree of opacity.
• the film provides the means by which the contents of the can can be seen through the film.
• the film may be caused to contour to some of the surfaces of the ring by a variety of means.
• the film may be contoured to the ring by the use of a former which is contoured in such a manner that it can press the appropriate portions of the film into the contours of the ring.
• this may be achieved by pressure forming, for example, the application of directed jets or general air pressure.
• the contouring of the film to the lid may be achieved by vacuum forming, for example by the application of a vacuum from beneath the RLF assembly.
• Vacuum forming or pressure forming can offer the advantage that the film may adhere to some degree to the lid.
• Another advantage of having some adhesion of the film to the lid is that less surface area of the film is available for oxygen to permeate through.
• the resultant minimal permeation means that a less expensive barrier material could be used. This can be significant if the present invention is used in packaging cheaper items than milk powder and coffee - for example nuts.
• the physical features of thin film is such that it has insufficient rigidity to hold itself into position in the contours, unlike aluminium foil.
• the present invention requires the provision of an adhesive between the ring and the film. Unless the film is held onto the ring assembly by some means, stacking of the ring RLF assembly cannot be achieved meaning some of the advantages of the present invention would be lost.
• the former itself may have a variety of configurations or different features to assist in the assembly process.
• the former may have a heated surface which can assist the film to contour (generally with less wrinkles) or adhere to the ring.
• Thermoforming the film to the ring by the former may cause an interference fit which can assist the adhesive in holding the film to the ring.
• release surfaces to ensure that the film does not stick to the former.
• these release surfaces may be of any suitable material or configuration.
• the release surfaces may either be TeflonTM material or perhaps a silicone rubber which has good heat transfer properties.
• the former may also provide a means by which the film can be cut to shape. Again, this may be achieved by a variety of ways.
• the film may be stretched over. Subsequent contraction of the cut film whether mechanical or through heating may fit the film to the ring.
• the former may be in the form of a heated punch and have a sharp outer edge.
• the edge may cut the film and the heated surface may assist in the contouring of the cut film to the ring. If the motion of the former onto the RLF assembly is sufficiently fast then it is possible that one quick action can perform the cutting and contouring of the film required.
• an outer sleeve to the former which has a cutting edge.
• This outer sleeve may be spring loaded in such a manner that the film may be cut before or after the film has been contoured, depending on what is desired.
• the film may be contoured to the ring through a variation of the traditional vacuum skinning process where the assembly is passed through a vacuum chamber.
• the adhesive may be any substance capable of ensuring that the film can be held with respect to the ring.
• the adhesive may be applied to the ring before the film is placed onto the lid ring. While this is an embodiment of the present invention which could work, this does add a step to the assembly process. As can be seen by the present invention it is successful in eliminating a number of the extra steps imposed by the thick film sealing method. Therefore, in preferred embodiments care has been taken to avoid as many additional steps as possible to ensure the efficiency of the process.
• the film used incorporates an adhesive layer in its structure capable of adhering the film to the ring.
• the film can come in any form which can provide the desired effect.
• the film has at least a gas barrier layer (to ensure viability of the can contents) and an adhesive layer.
• the film is a five layer structure which includes a gas barrier layer, a structural strength layer and an adhesive layer, these three layers being bonded together by two bond layers.
• a variety of materials can make up each of the layers.
• Adhesive EVA 28% VA 15 microns The above is given as an example of a preferred film. It should be appreciated that other thicknesses and compositions may be used. Further, there is not necessarily a requirement to have five layers and other numbers of layers can be used depending upon the use of the present invention.
• EVA adhesive can adhere film readily to metal upon the application of heat and/or pressure. This can be applied by a former as described earlier in this specification.
• Sealing compound may be added to the RLF assembly immediately after it is formed or during the can assembly process.
• the sealing compound may be any suitable compound and in one embodiment may be rubber.
• Another advantage of less sealing compound is that there is a reduced buildup of compounds occurring in front of the seaming rollers when the ring is being attached to the can body.
• the amount of plastics film used in the outside of the ring is more critical than in the aluminium foil process.
• the "amount of film” shall be interpreted as volume - that is, surface area times thickness.
• the applicants have found that less plastics material is required than aluminium foil. If too much plastics material is used, the film may shear off at the outside of the ring when the can is applied. This can lead to bundling of the film on the outer seal and a "fat seam". Such a seam may not provide a perfect seal as well as providing a seam that does not look acceptable to the consumer.
• the ability to just visually inspect the contents of a can through a clear film is not sufficient to determine whether the can has been contaminated or tampered with.
• the oxygen in the atmospheric gases can cause degradation of the contents in a can making them unfit to consume.
• this degradation may not cause a physical change to the can contents or a change that is not readily recognised by a consumer.
• chemical substances may be injected into the can via hypodermic syringe through an act of sabotage.
• a container capable of being sealed, the container including a visual indicator of at least one parameter within the container.
• the visual indicator shall be taken to mean any indicator capable of converting a non-visual parameter into visual form.
• the indicator may indicate increased levels of oxygen. This will generally occur if the contents of the can have been packed under modified atmosphere which has a low oxygen component. If the integrity of the seal in the can is breached then the oxygen and the atmospheric gases which enter the can is detected by the indicator.
• the indicator may detect the reduction of carbon dioxide.
• a modified atmosphere has a high carbon dioxide content whereas the carbon dioxide content of air is in the order of 0.03%.
• atmospheric gas entering a breach in the sealed can (which is usually packed under vacuum) will dilute the concentration of carbon dioxide in the can.
• the carbon dioxide within the can may just escape through the breached seal.
• the degradation of a product itself may result in the production of various gases which can be detected by the indicator.
• the visual indicator may just be a loose object lying on the top surface of the can contents which is visible through a clear seal.
• the visual indicator may be attached to the inside wall of the can and be visible through a clear seal.
• the indicator is actually incorporated into the film that seals the can.
• the nature of the visual indication can be of any suitable form.
• the visual indicator may merely change colour.
• the indicator may either become opaque or transparent.
• the intensity of the indicator colour may change.
• Suitable indicators which can be used with the present invention for the detection of carbon dioxide may be a salt of an indicator anion and a lipophilic organic quaternary cation.
• Suitable indicator anions may be azo dyes (including alpha-naphthol orange), nitrophenol dyes (including m-nitrophenol and p-nitrophenol), phthalein dyes (including alpha- naphtholphthalein and o-cresol phthalein), sulphonephthalein dyes (including m- cresol purple, cresol red, thymol blue and alpha-naphtholsulphonephthalein), triphenylmethane dyes (including rosolic acid) and indophenol dyes (including indophenol and l-naphthol-2-suphonic acid indophenol).
• ammonium cations including benzyltrimethyl ammonium, trioctylmethyl ammonium, triceprylmethyl ammonium, tetrabuty ammonium, tetrapexyl ammonium and tetraoctyl ammonium
• phosphonium cation including tetraphenyl phosphonium, trioctyl phosphonium and hexadecyl tributyl phosphonim.
• a preferred quaternary cation is tetrabutyl ammonium.
• a suitable oxygen indicator may be an indophenol type dye such as 2,6- dichloroindophenol.
• This dye may be used as ink by mixing it with a reducing agent, alcholye agent, moisture retaining agent, binder, solvent and water. The use of this dye is discussed in greater detail in Japanese Patent Application No. JP06034619-A.
• a key against which the indicator may be compared may provide the consumer with information as to the meaning of the indicator.
• the indicator forms part of the film, it may come in a number of different shapes, for example, the indicator may be a strip which is co-extruded with the film.
• the indicator may be a whole of the film sealing the can.
• the indicator may be a discrete pattern on the film.
• the indicator may form a part of a multi-layer film.
• the layers of the film should preferably be such that the gas present within the container can readily permeate to the indicator to effect the visual change.
• the film is configured so that external layers of the film cannot allow atmospheric gas to permeate through to the indicator. It may be possible that the indicator adds an additional thickness to the film which could interfere with the sealing process.
• a thin film may be used which can be easily cut to access the can without creating sharp edges.
• Any fragments of the film that may stray into the contents of the can may be inert and as a result may pass through a person's body without a harmful effect, unlike the foil fragments used in conventional cans.
• the ability to provide an indicator which can advise the consumer of the freshness of the contents of the can is a significant advantage.
• the present invention can be utilised in an efficient manufacturing process.
• Figure 1 illustrates a typical prior art RLF assembly before attachment to a can
• FIG. 2 illustrates an RLF assembly in accordance with one embodiment of the present invention
• Figure 3 is a cut-away view of equipment used in one manufacturing process in accordance with the present invention
• Figure 4 is a cross-sectional view of an RLF assembly in accordance with the present invention which has been attached to a can
• Figure 5 is a plan view showing the use of indicators with the present invention.
• Figure 1 is an illustration of a conventional RLF assembly generally indicated by arrow 1 .
• the assembly 1 includes a ring generally indicated by arrow 2, a lid 3 and a film 4 in the form of aluminium foil.
• the ring 2 has three main sections.
• the first section 5 is a flange or channel into which the aluminium foil has been pressed.
• the flange 5 is folded over and crimped to the can wall to seal the RLF assembly 1 to a can 31. This is more clearly shown in Figure 4.
• the mid-section 6 of the ring 2 provides a space between the ring 2 and lid 3 which enables a person to readily lever off the lid 3 from the can.
• the third section 7 ofthe ring 2 acts as a support for the lid 3.
• the lid 3 includes a substantially flat central portion 8 and a flange 9 that overhangs section 7 of the ring 2.
• aluminium foil 4 can be pressed into shape into the ring 2. This can be seen by the flat portion of the foil 4 that is pressed against the mid-section 6. It should also be noted that the foil 4 extends almost to the periphery of the flange 5.
• FIG. 2 illustrates an RLF assembly generally indicated by arrow 1 1 which is in accordance with one embodiment of the present invention.
• the ring 12 and lid 13 in this embodiment have the same configuration as the prior art ring 2 and lid 3.
• the film 14 attached to the ring 12 is a multilayered plastics film of a type described previously in the patent specification.
• the inventors have found that the amount of plastics material in the flange 15 of the ring 12 can be critical. Too much plastics material 14 can cause bundling of the film in the outer seal 30 (which is shown more clearly in Figure 4). This bundling of film can lead to a fat seam and subsequent poor sealing properties.
• the flat surface of the flange 15 is in the order of 3.32 millimetres. It has been found that the tolerances of where the edge of plastics material 14 can fit into the flange 15 is from the edge of the flat portion to approximately the middle of the flat portion. This is illustrated in Figure 2 and avoids the problems discussed above.
• the prior art assembly illustrated in Figure 1 shows a portion of the aluminium foil 4 formed parallel to the ring flat section 6. Generally this feature is required where the can contents are to be subjected to a vacuuming process.
• the amount of the parallel forming is at the discretion of the can-maker and is adjusted to minimise the void created between the ring, lid, and foil. Failure to minimise this void may result in difficulties during the vacuuming process as the air contained in the void may be of sufficient volume and pressure to cause the lid 8 to be partially or totally dislodged from it's engagement with the ring 2.
• the application of the plastic film may be similarly adjusted by the can-maker depending upon the intended can contents and the type of filling process used.
• the film would be attached over this area in the same manner as the area 16 in Figure 2.
• Figure 2 does not show a parallel area between 16 and 14 as described above and in this form the ring, lid, and foil assembly would probably be used on non-gassed products.
• Figure 3 illustrates one way by which the film 14 can be attached to a ring lid assembly generally indicated by arrow 11.
• a length of film 14 passes over a ring 12 and lid 13.
• a heated former 20 with an outer cutting sheath 21 descends onto the film 14. The positioning of the sheath 21 and former 20 is such that the film 14 is cut fractionally before the heated former 20 pushes the film 14 into the channel 15.
• the action of the heated former 15 causes the adhesive layer of the film 14 to adhere the film 14 to the ring 12.
• the action of the former to contour the film to the ring/lid assembly 11 means that the cut outer edge of the film 14 is positioned within the channel 15 in accordance with the tolerances discussed earlier.
• a sealing compound (not shown) is then placed on top of the film 14 within the channel 15.
• the final RLF assemblies are them stored until used in the final can assembly process.
• Figure 4 illustrates how a typical RLF assembly generally indicated by arrow 11 is affixed to a can 31. It can be seen that the foil 14 has been folded over with the flange 15 and the wall of the can 31 to form a seam generally indicated by arrow 30.
• Figure 5 is a top view of a can 31 with a lid off showing a film 14 and a possible arrangement of indicators 32, 33 and 34.
• the indicators 32, 33 and 34 are extruded with the film 14.
• Each of the indicators change colour according to different parameters they sense within the can 31.
• indicator 32 may detect moisture
• indicator 33 may detect CO2
• indicator 34 may detect O2-

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Packages (AREA)
• Closures For Containers (AREA)
• Glass Compositions (AREA)
• Sampling And Sample Adjustment (AREA)
• Thermally Insulated Containers For Foods (AREA)
• Packaging Frangible Articles (AREA)
• Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)

Priority Applications (6)

Applications Claiming Priority (4)

Publications (1)

Family

ID=26651556

Family Applications (1)

Country Status (10)

Cited By (4)

Citations (6)

Family Cites Families (2)

• 1996
  • 1996-12-16 WO PCT/NZ1996/000142 patent/WO1997025255A1/en active IP Right Grant
  • 1996-12-16 ES ES96941235T patent/ES2152573T3/es not_active Expired - Lifetime
  • 1996-12-16 NZ NZ323480A patent/NZ323480A/xx unknown
  • 1996-12-16 EP EP96941235A patent/EP0874764B1/de not_active Expired - Lifetime
  • 1996-12-16 AT AT96941235T patent/ATE195918T1/de not_active IP Right Cessation
  • 1996-12-16 DE DE69610124T patent/DE69610124T2/de not_active Expired - Fee Related
  • 1996-12-16 CA CA002241534A patent/CA2241534A1/en not_active Abandoned
  • 1996-12-16 BR BR9612429-6A patent/BR9612429A/pt not_active Application Discontinuation
  • 1996-12-16 AU AU10433/97A patent/AU713115B2/en not_active Ceased
  • 1996-12-17 TW TW085115565A patent/TW333515B/zh active

Patent Citations (6)

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