US20200079565A1 - Blister Pack with Built-In Cutting Ledges - Google Patents
Blister Pack with Built-In Cutting Ledges Download PDFInfo
- Publication number
- US20200079565A1 US20200079565A1 US16/562,511 US201916562511A US2020079565A1 US 20200079565 A1 US20200079565 A1 US 20200079565A1 US 201916562511 A US201916562511 A US 201916562511A US 2020079565 A1 US2020079565 A1 US 2020079565A1
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- United States
- Prior art keywords
- sheet
- package
- depression
- base
- article
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- 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.)
- Pending
Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 24
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 55
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 11
- 239000011888 foil Substances 0.000 claims description 7
- 229920000642 polymer Polymers 0.000 claims description 7
- 229920001577 copolymer Polymers 0.000 claims description 5
- 229920001897 terpolymer Polymers 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 4
- 229920000728 polyester Polymers 0.000 claims description 4
- -1 polypropylene Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims description 3
- 239000004713 Cyclic olefin copolymer Substances 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 229920001328 Polyvinylidene chloride Polymers 0.000 claims description 3
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 claims description 3
- 239000005023 polychlorotrifluoroethylene (PCTFE) polymer Substances 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 3
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 3
- 229920002554 vinyl polymer Polymers 0.000 claims description 3
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims 1
- 238000007789 sealing Methods 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 239000000123 paper Substances 0.000 description 5
- 239000011101 paper laminate Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000002537 cosmetic Substances 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003826 tablet Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 102000011842 Serrate-Jagged Proteins Human genes 0.000 description 1
- 108010036039 Serrate-Jagged Proteins Proteins 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000000499 gel Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 239000002650 laminated plastic Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 239000007937 lozenge Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000006072 paste Substances 0.000 description 1
- 239000006187 pill Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
- A61J1/00—Containers specially adapted for medical or pharmaceutical purposes
- A61J1/03—Containers specially adapted for medical or pharmaceutical purposes for pills or tablets
- A61J1/035—Blister-type containers
-
- 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
- B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
- B65D75/28—Articles or materials wholly enclosed in composite wrappers, i.e. wrappers formed by associating or interconnecting two or more sheets or blanks
- B65D75/30—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding
- B65D75/32—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding one or both sheets or blanks being recessed to accommodate contents
- B65D75/325—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding one or both sheets or blanks being recessed to accommodate contents one sheet being recessed, and the other being a flat not- rigid sheet, e.g. puncturable or peelable foil
- B65D75/327—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding one or both sheets or blanks being recessed to accommodate contents one sheet being recessed, and the other being a flat not- rigid sheet, e.g. puncturable or peelable foil and forming several compartments
-
- 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
- B65D83/00—Containers or packages with special means for dispensing contents
- B65D83/04—Containers or packages with special means for dispensing contents for dispensing annular, disc-shaped, or spherical or like small articles, e.g. tablets or pills
- B65D83/0445—Containers or packages with special means for dispensing contents for dispensing annular, disc-shaped, or spherical or like small articles, e.g. tablets or pills all the articles being stored in individual compartments
- B65D83/0463—Containers or packages with special means for dispensing contents for dispensing annular, disc-shaped, or spherical or like small articles, e.g. tablets or pills all the articles being stored in individual compartments formed in a band or a blisterweb, inserted in a dispensing device or 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
- B65D2575/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes or webs of flexible sheet material, e.g. in folded wrappers
- B65D2575/28—Articles or materials wholly enclosed in composite wrappers, i.e. wrappers formed by association or interconnecting two or more sheets or blanks
- B65D2575/30—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding
- B65D2575/32—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding one or both sheets or blanks being recessed to accommodate contents
- B65D2575/3209—Details
- B65D2575/3218—Details with special means for gaining access to the contents
- B65D2575/3254—Integral means for assisting piercing or tearing
Definitions
- This invention relates to blister packs, especially the push-through type of blister packs for containment and dispensing of deformable or fragile articles.
- Blister packs have been used for containing various products such as medicine, food, cosmetics, personal cleansing products or laundry care products, while protecting such products from damage or exposure.
- Unit doses of such products are stored in readily accessible, individually sealed compartments (i.e., blisters) of such blister packs.
- a back sheet is used to seal the individual compartments in the blister packs.
- Each compartment can then be opened independent of any other compartments in such blister packs.
- the back sheet can be peeled back to expose the contents of individual compartments.
- the back sheet is frangible and can be broken when the contents of individual compartments are pushed against it by application of external force thereon.
- Blister packs with such frangible back sheets are referred to as the “push-through type”, and they can be readily used for containing solid and rigid products that are structurally sound, such as pills or lozenges.
- the push-through type blister packs may be unsuitable for housing and dispensing deformable or fragile products or contents.
- U.S. Pat. No. 5,816,404 discloses a blister pack with an opener that is supported by a frame over the blister opening, and such opener can be displaced downwardly to first piece a back sheet that covers the blister opening and then to remove such back sheet by rotation.
- U.S. Pat. No. 6,443,307 discloses a blister pack with dome-shaped blisters sealed by a lower membrane, while each dome-shaped blister contains an annular-shaped internal cutter that can be used to cut through the lower member by simply depressing the dome-shaped blister.
- such known internal or external cutters or openers tend to have complex structures, and to make them requires significant additional materials and complicated processing steps, which can be cost-prohibitive for certain consumer goods such as cosmetics, personal cleansing products or laundry care products.
- the present invention provides push-through type of blister packs with built-in ledges formed by at least one reinforcing sheet, which are both easy/inexpensive to make and effective for cutting the back or lid sheet that seals the blisters.
- built-in ledges enable easy release of products/contents from the blister packs with minimal damage or deformation, so are particularly suitable for use with deformable or fragile products/contents, more preferably a product/content that is elastically deformable.
- the present invention in one aspect provides a package for containing and dispensing at least one article, which comprises:
- the present invention in another aspect provides a blister pack for containing and dispensing multiple unit doses of a product, which comprises:
- Such package or blister pack with the reinforcing sheet is easy/inexpensive to make, while the cutting ledges formed by the cut-out sections in the reinforcing sheet are simple yet structurally sound/robust. More importantly, they are effective for cutting the lid sheet with minimal impact/force on the article or product contained therein during release.
- FIG. 1 is a cross-sectional view of a prior art blister pack configured for containing and dispensing a solid and rigid product.
- FIG. 2 is a cross-sectional view illustrating the difficulties encountered when using the prior art blister pack of FIG. 1 to contain and dispense a deformable or fragile product.
- FIG. 3 is a cross-sectional view of a blister pack according to one embodiment of the present invention.
- FIG. 4A is a perspective view of a blister pack according to one embodiment of the present invention, which contains a top reinforcing sheet and a bottom reinforcing sheet.
- FIG. 4B is a top view of the top and bottom reinforcing sheets of FIG. 4A .
- the present invention provides a new push-through type of blister pack or package.
- a substantially impermeable plastic material 1 is used to form multiple blisters 2 , each of which defines a cavity or depression for the containment of a solid and rigid tablet 4 therein.
- the openings 3 of the blisters 2 are closed or sealed by a rupturable lid sheet 5 formed of a metal foil, which is thin enough so that when the blisters 2 are compressed by the application of an external force F into shape 2 A, the metal foil lid sheet 5 will break or rupture. Consequently, the solid and rigid tablet 4 will be forced out of the compressed blisters 2 A.
- the need of a greater external force F to rupture the lid sheet may result into either the impossibility to withdraw the product from the blister pack or in severe and potentially irreversible deformation of the product 4 ′′, and in some cases even lead to significant damages of such product.
- the present invention provides a package or blister pack with a reinforcing sheet attached to the lid sheet at a side opposite to the blisters.
- a reinforcing sheet helps to improve the overall structural integrity of the blister pack against bending under excessive external force. More importantly, such reinforcing sheet forms cutting ledges near the openings of the blisters, and such ledges are particularly effective in converting external force applied generally to the lid sheet into a highly localized cutting force for rupturing the lid sheet along such ledges, thus minimizing the de-blistering force.
- FIG. 3 is a cross-sectional view of a package 10 according to a specific embodiment of the present invention, which comprises a base sheet 20 having one or more depressions or blisters 22 A and 22 B formed therein, for containing one or more articles or unit doses of products 23 A and 23 B.
- the base portion of such base sheet 20 is preferably substantially planar.
- the depressions or blisters 22 A and 22 B each has an opening near the base portion of the base sheet 20 .
- a substantially planar lid sheet 30 is attached to the base portion of the base sheet 20 , e.g., by heat sealing, adhesives, or any other suitable attachment mechanisms, to cover the openings of the depressions or blisters 22 A and 22 B, thereby enclosing and sealing the articles or products 23 A and 23 B inside the depressions or blisters 22 A and 22 B.
- a substantially planar reinforcing sheet 40 is attached to the lid sheet 30 at a side that is opposite from the base sheet 20 , e.g., by heat sealing, adhesive, or any other suitable attachment mechanisms.
- the reinforcing sheet 40 comprises one or more cut-out sections 42 A and 42 B, which overlap with but offset from the openings of the depressions or blisters 22 A and 22 B, thereby forming one or more ledges 44 A and 44 B near the blister openings.
- Such ledges 44 A and 44 B function to localize any external force applied to the lid sheet 30 through compression of the blisters 22 A and 22 B and/or the articles or products 23 A and 23 B, and such localized force is then focused for cutting the lid sheet 30 near the blister openings. Because the external force applied to the lid sheet 30 is so localized, less force is needed for cutting the lid sheet 30 and releasing the articles/products 23 A and 23 B from the blisters 22 A and 22 B. Correspondingly, the articles/products 23 A and 23 B are subject to less deformation or impact, and the risk of irreversible deformation or damages is significantly reduced.
- such a substantially planar reinforcing sheet 40 to structurally reinforce the package 10 and to provide built-in cutting ledges 44 A and 44 B for rupturing the lid sheet 30 adds little or no additional cost and complexity to the manufacturing process, and it requires minimal additional capital investment. More importantly, such built-in cutting ledges 44 A and 44 B are structurally integral with other components of the package 10 , and they are unlikely to be damaged or cause damages to the articles or products 23 A and 23 B contained in the package 10 or to other components during shipment or transportation.
- the depressions or blisters according to the present invention may be of any suitable shape, e.g., cubical, rectangular, cylindrical, semi-spherical or dome-shaped. It is preferred that the depressions or blisters have round edges, and more preferably the depressions or blisters have a semi-spherical or dome shape (as shown in 22 A and 22 B of FIG. 3 ), which allows for easy compression thereof under impact of external forces. As known in the art, as the blister cavity is depressed, the pressure within the cavity increases. This extra pressure helps expel the article from the blister.
- the package 10 may further comprise an additional reinforcing sheet 50 , which is attached to the base sheet 20 at a side opposite from the lid sheet 30 .
- the additional reinforcing sheet 50 comprises one or more additional cut-out sections that are configured for accommodating the depressions or blisters 22 A and 22 B, i.e., the depressions or blisters 22 A and 22 B can fit through the additional cut-out sections in such additional reinforcing sheet 50 , as shown in FIG. 3 .
- Such additional reinforcing sheet 50 provides additional structural reinforcement for the package 10 from its back side.
- Such additional reinforcing sheet 50 can be easily formed from the same sheet of paper laminate or paper/polymer laminate used for forming the aforementioned reinforcing sheet 40 , e.g., by folding such sheet of paper laminate or paper/polymer laminate over into two halves.
- FIG. 4A shows a perspective view of a blister pack 100 , which includes a base sheet (not shown) having a plurality of blisters 122 A and 122 B formed therein, each of which has an opening (not shown) and is configured for containing a unit dose of a deformable or fragile product (not shown).
- the blister pack 100 further comprises a lid sheet (not shown) attached to said base sheet (not shown) from beneath to cover the openings (not shown) of the blisters 122 A and 122 B.
- each cavity of the blister pack is spaced by at least 2 mm, even more preferably above 3 mm and most preferred above 4 mm to allow adequate sealing between the base sheet and the lid sheet, thus minimizing the risk of exposing each adjacent cavity when the product is pushed out.
- the cavities of the blister pack may be spaced to allow a finger to press on each of them individually without interference.
- the margin of the base sheet and the lid sheet should have a seal area preferably above 2 mm, even more preferably above 3 mm and most preferred above 4 mm
- a top reinforcing sheet 150 is attached to the base sheet (not shown) from above, while such top reinforcing sheet 150 contains a plurality of top cut-out sections (not shown) configured for accommodating the blisters 122 A and 122 B, i.e., by allowing them to come therethrough.
- a bottom reinforcing sheet 140 is attached to the lid sheet (not shown) from beneath, said bottom sheet 140 containing a plurality of cut-sections 142 A and 142 B, each of which overlaps with but offsets from one of the blister openings (not shown) so that portions of the bottom reinforcing sheet 140 form a plurality of ledges 144 A and 144 B.
- Each of the ledges 144 A and 144 B is near one of the blister openings (not shown) for cutting the lid sheet (not shown) at the blister opening and releasing a unit dose of the deformable or fragile product (not shown).
- FIG. 4B shows a top view of only said top reinforcing sheet 150 and the bottom reinforcing sheet 140 (not directly visible).
- the top reinforcing sheet 150 comprises multiple top cut-out sections 152 A and 152 B that are configured to accommodate the blisters 122 A and 122 B previously shown in FIG. 4A .
- the bottom reinforcing sheet 140 (not visible here) contains multiple bottom cut-out sections 142 A and 142 B that overlap with but offset from the blister openings (not shown here) and correspondingly the top cut-out sections 152 A and 152 B.
- portions of the bottom reinforcing sheet 140 (not visible) for multiple ledges 144 A and 144 B that can be seen through the top reinforcing sheet 150 , and such ledges 144 A and 144 B enable localization of external forces for cutting the lid sheet that seals the blister openings.
- the article or product to be housed by the package or blister pack of the present invention can be of any form, e.g., solid, semi-solid, powder, paste, liquid, gel, foam, and the like.
- such article or product is deformable or fragile. More preferably, such article or product is elastically deformable, i.e., it can be deformed under stress but can eventually return to the original shape with little or no change in shape when the stress is removed.
- such article or product is characterized by a Young's Modulus of no more than about 5, preferable from about 0.01 to about 1, more preferably from about 0.01 to about 0.5, most preferably from about 0.01 to about 0.1.
- such article or product is flexible, porous and dissolvable, which may contain one or more water-soluble polymer in combination with one or more functional ingredients.
- the article or product of the present invention may have any shape or size suitable for its intended use, as long as it is configured for passing through the blister opening and the cut-out section in the reinforcing sheet after the lid sheet has been broken or ruptured by the ledge, while itself will not be cut or damaged by the ledge.
- the article should have a footprint area smaller than 600 mm 2 , more preferably below 400 mm 2 and even more preferably below 200 mm 2 and a thickness preferably above 6 mm, more preferably above 10 mm and even more preferably above 15 mm.
- the base sheet of the present invention is preferably a flexible yet structurally sound sheet with a substantially planar base portion and one or more depressions or blisters formed therein.
- the base sheet may be formed of any suitable materials, including but not limited to: plastic materials, plastic laminates, and the like.
- the base sheet materials should be compatible with the product stored inside and have a low water-vapor transmission rate (depending on the specific application).
- Suitable plastic materials for making the base sheet of the present invention may be selected from the group consisting of polypropylene (PP), copolymers and terpolymers of propylene, polyethylene (PE), polyvinyl chloride (PVC), polyvinyl dichloride (PVdC), copolymers and terpolymers of vinyl chloride and/or vinyl dichloride, poly-chloro-tri-fluoro-ethylene (PCTFE), cyclic olefin copolymers (COC) and combinations thereof.
- the base sheet is formed by a transparent PP material.
- the base sheet may be characterized by a thickness at its base portion (i.e., base thickness) ranging from about 100 microns to about 1000 microns, preferably from about 200 microns to about 800 microns, more preferably from about 300 microns to about 600 microns, most preferably about 500 microns.
- the thickness of such base sheet at the depression or blister portion i.e., depression thickness or blister thickness
- the depression/blister thickness of the base sheet may be no more than 3 ⁇ 4, preferably no more than about 3 ⁇ 5, more preferably no more than about 1 ⁇ 2 of its base thickness. Depressions or blisters with such reduced depression thickness are easily deformable and can be deformed/compressed downwardly toward the blister openings when an external force is applied, while offering sufficient strength to prevent denting or damage during distribution or package handling.
- the lid sheet as used in the present invention may be substantially planar and is preferably coterminous with the base sheet.
- a lid sheet can be attached to the base sheet by any attachment mechanisms, e.g., heat-sealing, adhesives, stamping, pressure-sealing, and the like.
- the lid sheet has a heat-sealable coating and is heat-sealed to the base sheet. More preferably, the heat-sealable coating is applied by lacquer and should have low density to minimize the film stretching and enhance its pierce-ability.
- Such a lid sheet may be formed of any suitable materials, such as aluminum foil, aluminum laminates, polymer laminate such as polyester laminates, polymer/aluminum laminates (especially polyester/aluminum laminates), paper, paper/aluminum laminates, and combinations thereof.
- a lid sheet is soft or hard tempered aluminum foil or aluminum laminate.
- the aluminum foil should be hard tempered with a thickness ranging from 12 to 30 microns, and most preferably between 15 to 25 microns.
- the lid sheet is a hard aluminum of 20 micron.
- the reinforcing sheets as used in the present invention may be formed of any suitable materials, including but not limited to paper laminates and paper/polymer laminates. Such reinforcing sheets preferably are thick enough to provide sufficient structural support for the blister pack of the present invention, i.e., to avoid significant bending of such blister pack during opening of the blisters and dispensing of the contents therein. Further, thicker reinforcing sheets provide stronger cutting ledges that can localize the cutting force more effectively.
- the reinforcing sheets of the present invention have a thickness (i.e., measured at a location away from the cut-out sections) ranging from about 0.5 mm to about 2 mm, preferably from about 0.7 mm to about 1.5 mm, more preferably from about 0.8 mm to about 1.2 mm
- the blister pack of the present invention comprises both the top and bottom reinforcing sheets, which are formed by folding a single paper laminate (preferably with a polymer coating thereon) into two halves and then stamped or punched to form the corresponding cut-out sections thereon.
- the cutting ledges formed by the offset portions of the bottom reinforcing sheet preferably have a semi-circular or arched shape, similar to those shown in FIGS. 4A and 4B .
- Such semi-circular or arched ledges are more effective for localizing the cutting force and cutting the lid sheet (in comparison with ledges that form a full or complete circle). It is also possible to provide ledges with sharp edges or even serrate edges to further improve the cutting effect.
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- Pharmacology & Pharmacy (AREA)
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Abstract
Description
- This invention relates to blister packs, especially the push-through type of blister packs for containment and dispensing of deformable or fragile articles.
- Blister packs have been used for containing various products such as medicine, food, cosmetics, personal cleansing products or laundry care products, while protecting such products from damage or exposure. Unit doses of such products are stored in readily accessible, individually sealed compartments (i.e., blisters) of such blister packs. Typically, a back sheet is used to seal the individual compartments in the blister packs. Each compartment can then be opened independent of any other compartments in such blister packs.
- In some blister packs, the back sheet can be peeled back to expose the contents of individual compartments. However, it is not uncommon for an area of such peelable sheet to tear away in such a manner as to expose more than one compartment, leaving the contents in the other compartments (other than the one intended to be opened) at risk for contamination. Therefore, such peelable type of blister packs may be undesirable.
- In other blister packs, the back sheet is frangible and can be broken when the contents of individual compartments are pushed against it by application of external force thereon. Blister packs with such frangible back sheets are referred to as the “push-through type”, and they can be readily used for containing solid and rigid products that are structurally sound, such as pills or lozenges. However, when the products to be contained and dispensed are elastically deformable or fragile, it is difficult to push through such products to break the back sheet without damaging or severely deforming the product. Therefore, the push-through type blister packs may be unsuitable for housing and dispensing deformable or fragile products or contents.
- In certain push-through type of blister packs, internal or external openers or cutters are provided for piecing or cutting the back sheet to release the contents of individual compartments. For example, U.S. Pat. No. 5,816,404 discloses a blister pack with an opener that is supported by a frame over the blister opening, and such opener can be displaced downwardly to first piece a back sheet that covers the blister opening and then to remove such back sheet by rotation. For another example, U.S. Pat. No. 6,443,307 discloses a blister pack with dome-shaped blisters sealed by a lower membrane, while each dome-shaped blister contains an annular-shaped internal cutter that can be used to cut through the lower member by simply depressing the dome-shaped blister. However, such known internal or external cutters or openers tend to have complex structures, and to make them requires significant additional materials and complicated processing steps, which can be cost-prohibitive for certain consumer goods such as cosmetics, personal cleansing products or laundry care products.
- Therefore, there is a need for new blister pack designs that are particularly suitable for housing and dispensing deformable or fragile articles, which are both easy to open and easy/inexpensive to make.
- The present invention provides push-through type of blister packs with built-in ledges formed by at least one reinforcing sheet, which are both easy/inexpensive to make and effective for cutting the back or lid sheet that seals the blisters. Such built-in ledges enable easy release of products/contents from the blister packs with minimal damage or deformation, so are particularly suitable for use with deformable or fragile products/contents, more preferably a product/content that is elastically deformable.
- The present invention in one aspect provides a package for containing and dispensing at least one article, which comprises:
-
- a) a base sheet having at least one depression formed therein for containing an article, the depression having an opening;
- b) a lid sheet attached to said base sheet to cover the opening of said at least one depression; and
- c) a reinforcing sheet attached to the lid sheet at a side opposite from said base sheet, said reinforcing sheet having at least one cut-out section that overlaps with but offsets from the opening of said depression so that a portion of the reinforcing sheet forms a ledge near the opening of said depression for cutting the lid sheet and releasing the article from said depression.
- The present invention in another aspect provides a blister pack for containing and dispensing multiple unit doses of a product, which comprises:
-
- a) a base sheet having a plurality of blisters formed therein, each of which has an opening and is configured for containing a unit dose of said product therein;
- b) a lid sheet attached to said base sheet to cover the openings of said blisters; and
- c) a reinforcing sheet attached to the lid sheet at a side opposite from said base sheet, said reinforcing sheet having a plurality of cut-out sections, each of which overlaps with but offsets from one of the blister openings so that portions of the reinforcing sheet form a plurality of ledges that each is near one of the blister openings for cutting the lid sheet at said opening and releasing the unit does of the product.
- Such package or blister pack with the reinforcing sheet is easy/inexpensive to make, while the cutting ledges formed by the cut-out sections in the reinforcing sheet are simple yet structurally sound/robust. More importantly, they are effective for cutting the lid sheet with minimal impact/force on the article or product contained therein during release.
- Further objects and advantages of the present invention will become apparent in the following description.
-
FIG. 1 is a cross-sectional view of a prior art blister pack configured for containing and dispensing a solid and rigid product. -
FIG. 2 is a cross-sectional view illustrating the difficulties encountered when using the prior art blister pack ofFIG. 1 to contain and dispense a deformable or fragile product. -
FIG. 3 is a cross-sectional view of a blister pack according to one embodiment of the present invention. -
FIG. 4A is a perspective view of a blister pack according to one embodiment of the present invention, which contains a top reinforcing sheet and a bottom reinforcing sheet. -
FIG. 4B is a top view of the top and bottom reinforcing sheets ofFIG. 4A . - The present invention provides a new push-through type of blister pack or package.
- In a conventional blister pack of the push-through type, as shown in
FIG. 1 , a substantially impermeable plastic material 1 is used to formmultiple blisters 2, each of which defines a cavity or depression for the containment of a solid and rigid tablet 4 therein. The openings 3 of theblisters 2 are closed or sealed by a rupturable lid sheet 5 formed of a metal foil, which is thin enough so that when theblisters 2 are compressed by the application of an external force F intoshape 2A, the metal foil lid sheet 5 will break or rupture. Consequently, the solid and rigid tablet 4 will be forced out of thecompressed blisters 2A. - However, when such conventional blister pack as described hereinabove is used to house and dispense an elastically deformable product 4′, the external force F applied onto the
blister cavity 2 will mostly be absorbed by the product 4′ to effectuate its deformation into the compressed form 4″, instead of being applied to the metal foil lid sheet 5 to effectuate its rupture, as shown inFIG. 2 . In order to eventually rupture the lid sheet 5 and to release the product 4″, significantly greater external force F needs to be applied now. The application of greater external force F may cause the entire blister pack to bend, making the force transfer less efficient and even compromising the structural integrity of the blister pack itself. Ultimately, the need of a greater external force F to rupture the lid sheet (de-blistering force) may result into either the impossibility to withdraw the product from the blister pack or in severe and potentially irreversible deformation of the product 4″, and in some cases even lead to significant damages of such product. - In order to solve the above technical problem, the present invention provides a package or blister pack with a reinforcing sheet attached to the lid sheet at a side opposite to the blisters. Such a reinforcing sheet helps to improve the overall structural integrity of the blister pack against bending under excessive external force. More importantly, such reinforcing sheet forms cutting ledges near the openings of the blisters, and such ledges are particularly effective in converting external force applied generally to the lid sheet into a highly localized cutting force for rupturing the lid sheet along such ledges, thus minimizing the de-blistering force.
- For example,
FIG. 3 is a cross-sectional view of apackage 10 according to a specific embodiment of the present invention, which comprises abase sheet 20 having one or more depressions orblisters products such base sheet 20 is preferably substantially planar. The depressions orblisters base sheet 20. A substantiallyplanar lid sheet 30 is attached to the base portion of thebase sheet 20, e.g., by heat sealing, adhesives, or any other suitable attachment mechanisms, to cover the openings of the depressions orblisters products blisters planar reinforcing sheet 40 is attached to thelid sheet 30 at a side that is opposite from thebase sheet 20, e.g., by heat sealing, adhesive, or any other suitable attachment mechanisms. The reinforcingsheet 40 comprises one or more cut-outsections blisters ledges lid sheet 30 through compression of theblisters products lid sheet 30 near the blister openings. Because the external force applied to thelid sheet 30 is so localized, less force is needed for cutting thelid sheet 30 and releasing the articles/products blisters products - Further, the use of such a substantially planar reinforcing
sheet 40 to structurally reinforce thepackage 10 and to provide built-incutting ledges lid sheet 30 adds little or no additional cost and complexity to the manufacturing process, and it requires minimal additional capital investment. More importantly, such built-incutting ledges package 10, and they are unlikely to be damaged or cause damages to the articles orproducts package 10 or to other components during shipment or transportation. - The depressions or blisters according to the present invention may be of any suitable shape, e.g., cubical, rectangular, cylindrical, semi-spherical or dome-shaped. It is preferred that the depressions or blisters have round edges, and more preferably the depressions or blisters have a semi-spherical or dome shape (as shown in 22A and 22B of
FIG. 3 ), which allows for easy compression thereof under impact of external forces. As known in the art, as the blister cavity is depressed, the pressure within the cavity increases. This extra pressure helps expel the article from the blister. Preferably but not necessarily, thepackage 10 may further comprise an additional reinforcingsheet 50, which is attached to thebase sheet 20 at a side opposite from thelid sheet 30. The additional reinforcingsheet 50 comprises one or more additional cut-out sections that are configured for accommodating the depressions orblisters blisters sheet 50, as shown inFIG. 3 . Such additional reinforcingsheet 50 provides additional structural reinforcement for thepackage 10 from its back side. Such additional reinforcingsheet 50 can be easily formed from the same sheet of paper laminate or paper/polymer laminate used for forming the aforementioned reinforcingsheet 40, e.g., by folding such sheet of paper laminate or paper/polymer laminate over into two halves. -
FIG. 4A shows a perspective view of ablister pack 100, which includes a base sheet (not shown) having a plurality ofblisters blister pack 100 further comprises a lid sheet (not shown) attached to said base sheet (not shown) from beneath to cover the openings (not shown) of theblisters top reinforcing sheet 150 is attached to the base sheet (not shown) from above, while suchtop reinforcing sheet 150 contains a plurality of top cut-out sections (not shown) configured for accommodating theblisters bottom reinforcing sheet 140 is attached to the lid sheet (not shown) from beneath, saidbottom sheet 140 containing a plurality of cut-sections bottom reinforcing sheet 140 form a plurality ofledges ledges FIG. 4B shows a top view of only said top reinforcingsheet 150 and the bottom reinforcing sheet 140 (not directly visible). Thetop reinforcing sheet 150 comprises multiple top cut-outsections blisters FIG. 4A . The bottom reinforcing sheet 140 (not visible here) contains multiple bottom cut-outsections sections multiple ledges top reinforcing sheet 150, andsuch ledges - The article or product to be housed by the package or blister pack of the present invention can be of any form, e.g., solid, semi-solid, powder, paste, liquid, gel, foam, and the like. Preferably, such article or product is deformable or fragile. More preferably, such article or product is elastically deformable, i.e., it can be deformed under stress but can eventually return to the original shape with little or no change in shape when the stress is removed. Most preferably, such article or product is characterized by a Young's Modulus of no more than about 5, preferable from about 0.01 to about 1, more preferably from about 0.01 to about 0.5, most preferably from about 0.01 to about 0.1. In a particularly preferred embodiment of the present invention, such article or product is flexible, porous and dissolvable, which may contain one or more water-soluble polymer in combination with one or more functional ingredients.
- The article or product of the present invention may have any shape or size suitable for its intended use, as long as it is configured for passing through the blister opening and the cut-out section in the reinforcing sheet after the lid sheet has been broken or ruptured by the ledge, while itself will not be cut or damaged by the ledge. To maximize the force transfer during dispensing preferably the article should have a footprint area smaller than 600 mm2, more preferably below 400 mm2 and even more preferably below 200 mm2 and a thickness preferably above 6 mm, more preferably above 10 mm and even more preferably above 15 mm. The base sheet of the present invention is preferably a flexible yet structurally sound sheet with a substantially planar base portion and one or more depressions or blisters formed therein.
- The base sheet may be formed of any suitable materials, including but not limited to: plastic materials, plastic laminates, and the like. The base sheet materials should be compatible with the product stored inside and have a low water-vapor transmission rate (depending on the specific application). Suitable plastic materials for making the base sheet of the present invention may be selected from the group consisting of polypropylene (PP), copolymers and terpolymers of propylene, polyethylene (PE), polyvinyl chloride (PVC), polyvinyl dichloride (PVdC), copolymers and terpolymers of vinyl chloride and/or vinyl dichloride, poly-chloro-tri-fluoro-ethylene (PCTFE), cyclic olefin copolymers (COC) and combinations thereof. In a particularly preferred embodiment of the present invention, the base sheet is formed by a transparent PP material.
- The base sheet may be characterized by a thickness at its base portion (i.e., base thickness) ranging from about 100 microns to about 1000 microns, preferably from about 200 microns to about 800 microns, more preferably from about 300 microns to about 600 microns, most preferably about 500 microns. The thickness of such base sheet at the depression or blister portion (i.e., depression thickness or blister thickness) is preferably significantly smaller than that of its base thickness, so as to enable easy deformation or compression of the depressions or blisters without compromising the overall structural integrity of the blister pack. For example, the depression/blister thickness of the base sheet may be no more than ¾, preferably no more than about ⅗, more preferably no more than about ½ of its base thickness. Depressions or blisters with such reduced depression thickness are easily deformable and can be deformed/compressed downwardly toward the blister openings when an external force is applied, while offering sufficient strength to prevent denting or damage during distribution or package handling.
- The lid sheet as used in the present invention may be substantially planar and is preferably coterminous with the base sheet. Such a lid sheet can be attached to the base sheet by any attachment mechanisms, e.g., heat-sealing, adhesives, stamping, pressure-sealing, and the like. Preferably, the lid sheet has a heat-sealable coating and is heat-sealed to the base sheet. More preferably, the heat-sealable coating is applied by lacquer and should have low density to minimize the film stretching and enhance its pierce-ability. Such a lid sheet may be formed of any suitable materials, such as aluminum foil, aluminum laminates, polymer laminate such as polyester laminates, polymer/aluminum laminates (especially polyester/aluminum laminates), paper, paper/aluminum laminates, and combinations thereof. Preferably, such lid sheet is soft or hard tempered aluminum foil or aluminum laminate. More preferably, the aluminum foil should be hard tempered with a thickness ranging from 12 to 30 microns, and most preferably between 15 to 25 microns. In a particularly preferred embodiment, the lid sheet is a hard aluminum of 20 micron.
- The reinforcing sheets as used in the present invention may be formed of any suitable materials, including but not limited to paper laminates and paper/polymer laminates. Such reinforcing sheets preferably are thick enough to provide sufficient structural support for the blister pack of the present invention, i.e., to avoid significant bending of such blister pack during opening of the blisters and dispensing of the contents therein. Further, thicker reinforcing sheets provide stronger cutting ledges that can localize the cutting force more effectively.
- Preferably, the reinforcing sheets of the present invention have a thickness (i.e., measured at a location away from the cut-out sections) ranging from about 0.5 mm to about 2 mm, preferably from about 0.7 mm to about 1.5 mm, more preferably from about 0.8 mm to about 1.2 mm More preferably, the blister pack of the present invention comprises both the top and bottom reinforcing sheets, which are formed by folding a single paper laminate (preferably with a polymer coating thereon) into two halves and then stamped or punched to form the corresponding cut-out sections thereon.
- The cutting ledges formed by the offset portions of the bottom reinforcing sheet preferably have a semi-circular or arched shape, similar to those shown in
FIGS. 4A and 4B . Such semi-circular or arched ledges are more effective for localizing the cutting force and cutting the lid sheet (in comparison with ledges that form a full or complete circle). It is also possible to provide ledges with sharp edges or even serrate edges to further improve the cutting effect. - The dimensions and values disclosed herein are not to be understood as being strictly limited to the exact numerical values recited. Instead, unless otherwise specified, each such dimension is intended to mean both the recited value and a functionally equivalent range surrounding that value. For example, a dimension disclosed as “40 mm” is intended to mean “about 40 mm.”
- Every document cited herein, including any cross referenced or related patent or application and any patent application or patent to which this application claims priority or benefit thereof, is hereby incorporated herein by reference in its entirety unless expressly excluded or otherwise limited. The citation of any document is not an admission that it is prior art with respect to any invention disclosed or claimed herein or that it alone, or in any combination with any other reference or references, teaches, suggests or discloses any such invention. Further, to the extent that any meaning or definition of a term in this document conflicts with any meaning or definition of the same term in a document incorporated by reference, the meaning or definition assigned to that term in this document shall govern.
- While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
Claims (20)
Priority Applications (1)
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US16/562,511 US20200079565A1 (en) | 2018-09-12 | 2019-09-06 | Blister Pack with Built-In Cutting Ledges |
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US201862730010P | 2018-09-12 | 2018-09-12 | |
US16/562,511 US20200079565A1 (en) | 2018-09-12 | 2019-09-06 | Blister Pack with Built-In Cutting Ledges |
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US20200079565A1 true US20200079565A1 (en) | 2020-03-12 |
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US16/562,511 Pending US20200079565A1 (en) | 2018-09-12 | 2019-09-06 | Blister Pack with Built-In Cutting Ledges |
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US (1) | US20200079565A1 (en) |
CN (1) | CN112689496A (en) |
WO (1) | WO2020055561A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD965440S1 (en) * | 2020-06-29 | 2022-10-04 | The Procter And Gamble Company | Package |
WO2023059638A1 (en) * | 2021-10-04 | 2023-04-13 | Westrock Mwv, Llc | Blister cavity opening feature |
Citations (1)
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US5172812A (en) * | 1992-01-23 | 1992-12-22 | Rexham Corporation | Child-resistant paperboard blister package and method of making the same |
Family Cites Families (10)
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US5323907A (en) * | 1992-06-23 | 1994-06-28 | Multi-Comp, Inc. | Child resistant package assembly for dispensing pharmaceutical medications |
US5816404A (en) * | 1996-02-20 | 1998-10-06 | Seidler; David | Blister pack with built-in openers |
US6443307B1 (en) * | 2000-01-25 | 2002-09-03 | Michael D. Burridge | Medication dispenser with an internal ejector |
AUPR551901A0 (en) * | 2001-06-07 | 2001-07-12 | Blast Packaging Pty Ltd | Improvements in packaging |
GB0120018D0 (en) * | 2001-08-16 | 2001-10-10 | Meridica Ltd | Pack containing medicament and dispensing device |
US6974032B2 (en) * | 2003-07-30 | 2005-12-13 | Intini Thomas D | Bend and peel packaging having controllable delamination |
CN202828484U (en) * | 2012-10-23 | 2013-03-27 | 邹浩军 | Officinal blister packaging |
CN203075205U (en) * | 2012-11-27 | 2013-07-24 | 西安力邦医药科技有限责任公司 | Packaging combination of nicorandil preparation |
CN105560054A (en) * | 2016-01-22 | 2016-05-11 | 仲恺农业工程学院 | Obstacle type pill package preventing pills from being taken by children by mistake |
CN206965753U (en) * | 2017-06-09 | 2018-02-06 | 北京百康芯生物科技有限公司 | A kind of micro-fluidic chip with reagent memory cell |
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2019
- 2019-08-21 WO PCT/US2019/047431 patent/WO2020055561A1/en active Application Filing
- 2019-08-21 CN CN201980059392.XA patent/CN112689496A/en active Pending
- 2019-09-06 US US16/562,511 patent/US20200079565A1/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5172812A (en) * | 1992-01-23 | 1992-12-22 | Rexham Corporation | Child-resistant paperboard blister package and method of making the same |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD965440S1 (en) * | 2020-06-29 | 2022-10-04 | The Procter And Gamble Company | Package |
WO2023059638A1 (en) * | 2021-10-04 | 2023-04-13 | Westrock Mwv, Llc | Blister cavity opening feature |
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CN112689496A (en) | 2021-04-20 |
WO2020055561A1 (en) | 2020-03-19 |
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