US3236373A - Cigarette package - Google Patents

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Publication number
US3236373A
US3236373A US322161A US32216163A US3236373A US 3236373 A US3236373 A US 3236373A US 322161 A US322161 A US 322161A US 32216163 A US32216163 A US 32216163A US 3236373 A US3236373 A US 3236373A
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Prior art keywords
package
sheet
skin
foamed
polymer
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US322161A
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John H Lux
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Haveg Industries Inc
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Haveg Industries Inc
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/14—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor using multilayered preforms or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/04—Bending or folding of plates or sheets
    • B29C53/06—Forming folding lines by pressing or scoring
    • 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
    • B65D43/14—Non-removable lids or covers
    • B65D43/16—Non-removable lids or covers hinged for upward or downward movement
    • B65D43/162—Non-removable lids or covers hinged for upward or downward movement the container, the lid and the hinge being made of one piece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • 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
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/07—Containers, packaging elements or packages, specially adapted for particular articles or materials for compressible or flexible articles
    • B65D85/08—Containers, packaging elements or packages, specially adapted for particular articles or materials for compressible or flexible articles rod-shaped or tubular
    • B65D85/10—Containers, packaging elements or packages, specially adapted for particular articles or materials for compressible or flexible articles rod-shaped or tubular for cigarettes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0053—Moulding articles characterised by the shape of the surface, e.g. ribs, high polish
    • B29C37/0057—Moulding single grooves or ribs, e.g. tear lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B29K2105/043—Skinned foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/16—Fillers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/16—Fillers
    • B29K2105/18—Fillers oriented
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/003—Reflective
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/59—Shaping sheet material under pressure
    • B31B50/592—Shaping sheet material under pressure using punches or dies

Definitions

  • This invention relates to the packaging of articles, especially cigarettes.
  • Another object is to reduce the cost of plastic cigarette packages without sacrificing rigidity or strength.
  • thermoform relatively shallow packages An additional object is to thermoform relatively shallow packages.
  • thermoplastic composition containing a leafingtype pigment can be extruded in the form of a sheet or tube and the leafing oriented in the plane of the sheet or, in the case of a tube, is oriented around the axis of the tube.
  • the tube can be subsequently cut to form a sheet or it can be used as a parison to form a blow molded package.
  • the leafing should have a thickness which is less than 4 and preferably less than A the smaller of its width or length.
  • the thickness can be or V1090 the smaller of the width or length.
  • the thickness can be 0.1 to 2 microns.
  • the leafing itself preferably is such as to pass a sieve of 50 mesh or smaller, e.g., 100 mesh, 200 mesh or 325 mesh, of the United States sieve series.
  • the leafing pigment can be a metal such as aluminum, gold, iron, silver, tin, copper, lead, alloys, e.g., bronze, brass, pewter and steel, or it can be mica or an organic pigment, e.g., a phthalocyanine such as co per phthalocyanine, copper octachlorophthalocyanine, copper hexadecachlorophthalocyanine or aluminum phthalocyanine.
  • the pigment should be well dispersed in the plastic so that the full surface of the platelets is uncovered and that substantially all of the platelets are oriented parallel to the surface of the plastic sheet. This can be achieved, for example, by repeated shearing along planes parallel to the direction of the finished sheets.
  • the leafing can be any flake material which melts above the extrusion temperature (usually 250 to 350 P.) which is a moisture impermeable solid.
  • the leafing pigment is encouraged to orient itself in the plane of the plastic material and to migrate as much 3,236,373 Patented Feb. 22, 1966 as possible toward the surface thereof. This is accomplished by first thoroughly dispersing the leafing pigment in the form of platelets in the plastic by conventional means such as mixing in a Banbury mixer, roll mill or other conventional equipment. The mass is then sheeted by extrusion through a slot die and calendering or casting, each of which operations serves to efiect some orientation of the platelets in the desired fashion. The orientation in the plane of the sheet is heightened by repeated rolling or calendering of the sheet so as to cause a further stretching of the sheet. The stretching orients the leafing in the direction of the surface.
  • the plastic containing the leafing can be extruded as a tube and blown in the form of a bubble. In such case, the product is biaxially oriented and the platelets become oriented.
  • the leafing can be 1 or 2% up to 10% of the Weight of the composition. While the leafing is throughout the plastic sheet or tube, it is much more concentrated on the exterior surfaces. As a result of this concentration and orientation of the leafing the moisture vapor transmission of the film is reduced.
  • the sheet material composition is a foamable plastic mixture such that at extrusion temperature and upon release to atmospheric pressure it tends to foam to about twice or more times its original volume.
  • an impervious tough skin is formed on one or both surfaces. This can be accomplished by chilling one or both surfaces while permitting the core of the sheet to expand.
  • the core comprises 50 to 96% of the total thickness of the skins and core.
  • the skins each normally range from 3 to 25% of the total thickness.
  • the density of the foam can be from 1.5 to 75% of the density of the unfoamed polymer. Preferably, the density of the foam is from 10 to 50% the density of the unfoarned polymer.
  • the foam has a density between 1 and lbs./ cu. ft. Normally, the density is at least 5 lbs/cu. ft. and preferably between 12 and 35 lbs/cu. ft. If an impervious skin is present, it has a density nearly that of the polymer itself, e.g., the skin will have a density of 60 to 66 lbs./ cu. ft. in the case of polystyrene. The density of the skin will be even greater than that of the polymer in the event that the higher amounts of the more dense leafing agents are employed.
  • polystyrene high impact polystyrene
  • high density polyethylene e.g. 0.96
  • polypropylene polypropylene, ethylene propylene copolymer e .g., :50), ethylene-butene1 copolymer (e.g., 90 10), acrylonitrile-butadiene-styrene copolymer e.g., 25
  • vinylidene chloride copolymers containing a major amount of vinylidene chloride, e.g., vinylidine chloridevinyl chloride (:15) and vinylidene chloride-acrylonitrile (80:20), polyvinyl chloride, vinyl chloride-vinyl acetate copolymer (e.g., 87:13), vinyl chloride-acrylonitrile copolymer (e.g., 80:20) polyvinyl acetals, e.g., polyvinyl formal and polyvinyl butyral.
  • vinylidene chloride copolymers e.g., vinylidine chloridevinyl chloride (:15) and vinylidene chloride-acrylonitrile (80:20
  • polyvinyl chloride vinyl chloride-vinyl acetate copolymer (e.g., 87:13)
  • vinyl chloride-acrylonitrile copolymer e.g. 80:20
  • polystyrene When employing polystyrene there can be employed normal crystal grade polystyrene or high impact polystyrene or a mixture containing 5 to normal crystal grade polystyrene and the balance high impact polystyrene.
  • a thermoplastic styrene polymer it normally contains greater than 50% by Weight of styrene and preferably at least 70% by weight of styrene in its structure.
  • the polystyrene is at least 10% high impact polystyrene.
  • High impact polystyrenes are frequently prepared by polymerizing monomeric styrene in the presence of 2 to 15% by weight of a rubbery diene polymer or by polymerizing styrene in the presence of such amounts of a difunctional material.
  • high impact styrene examples include .a terpolymer of 5% *acrylonitrile, 5% butadiene and 90% styrene; a copolymer of 5% b-utadiene and 95% styrene; the product made by polymerizing 95 of styrene in the presence of 5% of polybutadiene; a copolymer of 5% chlorosulfonated polyethylene and 95% styrene; a blend of 97.5% polystyrene and 2.5% polybutadiene; a blend of 95% polystyrene and 5% hydrogenated polybutadiene containing 35.4% residual unsaturation; polystyrene formed in the presence of 5% hydrogenated polybutadiene containing 4.5% of residual unsaturation, a blend of 95 polystyrene and 5% polyiso-prene, a blend of 98% polystyrene with 2% rubbery butadiene-
  • the foamable thermoplastic resins which can be extruded according to the invention include cellulose ethers and esters, e.g., ethyl cellulose, cellulose acetate, cellulose acetate-butyrate, homopolymers and interpolymers of monomeric compounds containing the CH C grouping, such as olefins, e.g., ethylene, propylene, isobutylene, butene-l, vinyl halides, e.g., vinyl chloride; vinylidene chloride; vinyl esters of carboxylic acids, e.g., vinyl acetate, vinyl stearate, vinyl benzoate, vinyl ethers, e.g., vinyl methyl ether, vinyl ethyl ether, vinyl isobutyl ether; chlorotrifluoroethylene, tetrafiuoroethylene, hexafluoropropylene, unsaturated carboxylic acids and derivatives thereof, e.g., acrylic acid, methacryl
  • a preferred class of materials with which optimum results are obtained are rigid, relatively non-elastic, thermoplastic resins, such as homopolymers and interpolymers of vinyl chloride, e.g., polyvinyl chloride, vinyl chloride-vinyl acetate copolymer (87:13), vinyl chloride-acrylonitrile copolymer (80:20); homopolymers of vinylidene aromatic hydrocarbons and ring halogenated derivatives thereof, e.g., styrene, o-chlorostyrene, p-chlorostyrene, 2,5-dichlorostyrene, 2,4-dichlorostyrene, p-methylstyrene, p-ethylstyrene, alpha-methylstyrene, vinyl naphthalene and interpolymers of such vinylidene monomers with each other and with other vinylidene monomers in which the interpolymer contains at least 70% of the vinylidene aromatic
  • thermoplastic resins include polycarbonates, e.g., the polymer from bisphenol A and diphenyl carbonate; polyoxymethylene (Delrin) oxymethylenealkylene oxide copolymers, e.g., oxymethylene-ethylene oxide (95:5), polyurethanes, e.g., from toluene diisocyanate and polypropylene glycol molecular weight 2025; Dacron (polyethylene terephthalate), nylon (e.g., polymeric hexamethylene adipamide).
  • polycarbonates e.g., the polymer from bisphenol A and diphenyl carbonate
  • Polyoxymethylene (Delrin) oxymethylenealkylene oxide copolymers e.g., oxymethylene-ethylene oxide (95:5)
  • polyurethanes e.g., from toluene diisocyanate and polypropylene glycol molecular weight 2025
  • Dacron polyethylene terephthalate
  • ABS terpolymers can be used, e.g., the terpolymer of 25% b-utadiene, 15% acrylonitrile and 60% styrene (a rigid ABS terpolymer) as well as other terpolymers containing 25 to 60% butadiene, 10 to acrylonitrile and 20 to 60% styrene.
  • a nucleating agent should be used in forming the foamed sheet.
  • nucleating agent When a nucleating agent is employed, it is used in an amount of from 0.02 to 10% of the total polystyrene by weight. Prefrably, 0.4 to 2% of the nucleating agent is used.
  • the nucleating agents are made up of two materials which react to form carbon dioxide and water.
  • the tw materials are normally used in approximately equivalent amounts.
  • the carbon dioxide liberating materials there can be used ammonium, alkali and alkaline earth carbonates or bicarbonates, e.g., ammonium bicarbonate, sodium bicarbonate, sodium carbonate, potassium bicarbonate, calcium carbonate.
  • the other material is an acid or acid-reacting salt, preferably solid, which is sufiiciently strong to liberate the carbon dioxide from the carbonate or bicarbonate.
  • the acid has at least 3.0 milliequivalents of acidic hydrogen, and preferably at least 10.0 milliequivalents, per gram.
  • the acid can be organic or inorganic.
  • Suitable acidic materials include boric acid, sodium dihydrogen phosphate, fumaric acid, malonic acid, oxalic acid, citric acid, tartaric acid, potassium acid tartrate, chloroacetic acid, maleic acid, succinic acid and phthalic acid.
  • anhydrous acids or salts there can be used the solid hydrates, e.g., oxalic-acid dihydrate and citric acid monohydrate.
  • a wetting agent such as Bayol 35 (a petroleum aliphatic hydrocarbon white oil), kerosene having an average of at least 8 carbon atoms in the molecule, alkylphenol-alkylene oxide adducts, e.g., Triton Xl00 (t-octylphenol-ethylene oxide 'adduct having 10 ethylene oxide units in the molecule), sodium lauryl sulfate and sodium dodecylbenzene sulfonate.
  • the wetting agent can be nonionic or anionic.
  • the preferred mode of incorporating the foaming agent into the polymer is by premixing the pelletized, solid, thermoplastic polymer, e.g., high impact styrene polymer, with a minor amount of an absorbent having absorbed thereon a volatile liquid (i.e., the foaming agent), which is non-reactive with and which has not more than a slight solvent action on the polymer.
  • a volatile liquid i.e., the foaming agent
  • the absorbent there can be employed any conventional absorbent in finely divided form, such as diatomaceous earth (Celite), fullers earth, silica gel, e.g., Cab- O-Sil and Hi-Sil, activated alumina, molecular sieves, attapulgus clay and activated carbon.
  • the absorbent is usually used in an amount of 0.1 to 15%, preferably 0.5 to 10% by weight of the polymer, although up to 25 or 30% of absorbent can be employed.
  • the absorbent is an inert filler of large surface area but small particle size, e.g., 200 mesh or below.
  • the volatile liquid there can be used aliphatic hydrocarbons boiling between 10 and C. and preferably between 30 and 90 C., e.g., petroleum ether (containing primarily pentane or hexane or a mixture of these hydrocarbons), pentane, hexane, isopentane, heptane, cyclohexane, cyclopentane, pentadiene and neopentane.
  • petroleum ether containing primarily pentane or hexane or a mixture of these hydrocarbons
  • volatile liquids include methanol, ethanol, methyl acetate, ethyl formate, dichloroethylene, perchloroethylene, dichlorotetrafiuoroethane, isopropyl chloride, propionaldehyde, diisopropyl ether, dichlorodifluoromethane, a mixture of pentane with 5 to 30% of methylene chloride or other volatile lower halogenated hydrocarbon.
  • the amount of volatile liquid absorbed on the absorbent can vary from 5 to or more based on the weight of the absorbent.
  • the amount of liquid absorbed will depend upon the capacity of the absorbent for the particular liquid. Normally, the absorbent containing the volatile liquid will appear to be a dry powder.
  • the volatile liquid employed should be one which is non-reactive with the particular polymer employed. Usually, the amount of volatile liquid will be 0.1 to 15% by weight of the polymer, e.g., polystyrene, to be expanded.
  • the amount of volatile liquid will depend upon the extent of foaming desired. In general, the greater the amount of absorbed volatile liquid in the polymer-absorbent mixture the more the expansion. It has been found that good expansion can be obtained using very small amounts of the volatile liquid.
  • the free-flowing powder consisting of the low boiling solvent or semi-solvent adsorbed on the inert filler of large .5 surface area is added to the extrusion grade plastic pellets, preferably along with the nucleating agent, and tumbled in a mixer.
  • the powder containing the volatile blowing agent will then disperse uniformly throughout the mixture While adhering to the plastic pellets.
  • the mixture is then fed into the hopper of an extruder.
  • foaming can be accomplished by adding a blowing agent to the plastic composition containing the leafing agent.
  • the blowing agent selected is one which does not release a gas at the extrusion temperature but which will release gas at a higher temperature, e.g., upon heating the sheet after calendering to orient the leafing pigment.
  • the foaming agent can be used in an amount of 0.5 to 25%, preferably 1 to 10% based on the total plastic composition by weight.
  • the surfaces of the sheet can be chilled in the manner previously indicated after foaming has started.
  • Foaming agent Gas release temperature, C. Azobisisobutyronitrile 115 N,N-dimethyl-N,N-dinitrosoterephthalamide 105 p,p'-Oxybis(benzenesulfonyl hydrazide) 150 Dinitrosopentamethylenetetramine 185 Azodicarbonamide 200 Sodium bicarbonate-citric acid (4:3) 140 Urea-biuret (33:67) 135 Diazoaminobenzene 100* 1,6-di-n-decyl azobisformamide 145 1,6-di-phenyl azobisformamide 176 Diphenyl 4,4'-di(sulfonyl azide) 145 p,p-Oxy-bis(N-nitroso-N-me'thyl benzenesulfonarnide) 130 Tetramethylene dinitrosodimethyl urethane 125 p,p-Oxybis(benzene
  • the chilling can be accomplished by the use of an inert fluid, e.g., with an air blast, an air-water mist, a water spray, argon, helium.
  • the cooling fluid is considerably below the temperature of the foaming mixture (mixture temperature is usually 250 to 400 F.). Thus, temperatures of 0 to 100 F. are employed for chilling.
  • air or other gas is the cooling fluid it can be employed as a blast at a flow rate of 40 to 100 ft./sec., for example.
  • moisture vapor transmission through a a foamed hydrocarbon polymer having a skin can be retarded by applying an integral protective coating of Saran.
  • a foamed hydrocarbon polymer having a skin e.g., polystyrene, polyethylene or polypropylene
  • an integral protective coating of Saran e.g., polyethylene, polypropylene or copolymers of ethylene with propylene or butylene to improve the adherence of the Saran to the skin surface
  • the skin is treated with an oxidizing agent, e.g., oxidizing gas flame, corona discharge, ozone, chromic acid or the like prior to application of the Saran.
  • the Saran layer need not be thick, e.g., it can be 0.1 to 2 mils.
  • the metal leafing also can be eliminated by forming the cigarette case of a foamed vinylidine chloride polymer having at least one skin and preferably two non-porous, impervious skins, integrally united to the foamed portion.
  • foamed vinylidine chloride polymer having at least one skin and preferably two non-porous, impervious skins, integrally united to the foamed portion.
  • Such cases can be blow molded or thermoformed.
  • typical suitable foamed vinylidine chloride polymer is vinylidine chloride-vinyl chloride (:20).
  • a blow molded cigarette package can be made in two portions from a thermoplastic resin foam consisting of a foam resin portion and at least one non-porous, impervious tough resin skin integral therewith, the foam portion being between 50 and 94% of the total thickness of the package.
  • the foam portion is a foam resin core integrally united to inner and outer skins.
  • the two halves of the package are blow molded from a foamed tubular parison which has at least one nonporous, impervious skin and preferably has both inner and outer non-porous, impervious tough skins.
  • the skins are formed by internal and external quench chilling of the parison formed from a foamable composition as it emerges from a hot extruder having an annular orifice.
  • the blow molded foamed package can be made as indicated from a vinylidine chloride resin, e.g., vinylidine chloride-vinyl chloride 15). Blowing is accomplished in a conventional blow mold while the parison is still hot using air, for example, as the blowing fluid.
  • One half of the skinned foamed package is blow molded with a crinkle in it and is then cut so that the crinkle slides under the larger diameter of the other half. After filling with the cigarettes the upper half, for example, with the crinkle is slid into place and the package heat sealed to insure that the cigarettes remain fresh and that no air can leak in.
  • a tear strip can be included in the sealing area to aid in subsequent opening.
  • An alternative procedure for making an airtight closure on the skinned foamed package is to vacuum form or injection mold the skinned foamed plastic container in two halves with a ridge on one half and a groove on the other so that it will snap in place and lock around the groove. To insure against air leakage the area of jointure can be heat sealed.
  • the cigarette packages of the present invention function as a low cost humidor and crush-proof container.
  • the use of the foamed plastic allows the construction of a rigid crush-proof box from smaller amounts of more inexpensive polymers than if this property had to be obtained by use of a non-foamed composition.
  • Retardation of moisture vapor penetration is enhanced by the presence of the closed cell bubbles in the wall structure and are further reinforced by the leafing pigment when such is employed.
  • the leafing pigment tends to be oriented parallel to the surface of the package in both sheeting and forming operations, thus further enhancing moisture vapor scaling properties.
  • the package can be formed by thermoforming, e.g., pressure or vacuum forming, blow molding or even by injection molding.
  • the package can :be only 5 to 10 mils thick after foaming and 10 to 20% of the thickness is in skin. However, thicker packages can be prepared, e.g., up to 50 mils or more.
  • Thermoforming is a particularly desirable way for making novel cigarette packages and other packages from the foamed thermoplastic materials having one or more skins.
  • thermoforming In a specific application of the thermoforming technique two adjacent halves of the package are contiguously thermoformed and cut out as a unit from a sheet of material and folded together with a continuous hinge folded in between the two halves.
  • This procedure is a very economical method of thermoforming, e.g., vacuum forming a flat plastic cigarette package. Previous methods for vacuum forming cigarette packages require deep drawing and the use of two separate portions to form the container. Also, the previous procedures did not employ foamed plastics.
  • the shallow drawing is accomplished by making the draw only the depth required to place 1 or 2 layers of cigarettes in the package (i.e., a depth equal to the diameter of 1 or 2 cigarettes) whereas the deep draw procedures require drawing to an extent equal to about the full length of the cigarettes.
  • at least one portion of the cigarette case must be drawn 80 mm. or more for king size cigarettes (or 70 mils for regular size cigarettes) while, with the instant procedure, the draw for the deepest half of the package can be as little as 6 mm. for a single layer of cigarettes or 12 mm. for a double layer. Slightly deeper draws, e.g., up to 20 mm. can be used.
  • the draw for the shallow portion of the package can be even less, e.g., 3 or 4 mm.
  • This method of shallow drawing is most advantageously used with a material such as polypropylene which has inherently good hinging properties.
  • the package is made of the skinned foamed thermoplastic materials of the types previously set forth.
  • the novel unitary shallow drawn containers can be formed from unfoamed sheets and can be used to package other materials, e.g., wrist watches, rings, playing cards, paper clips, staples, paper, etc.
  • This phase of the invention particularly when a skinned foamed plastic material is employed, makes possible the low cost use of stronger and self-supporting plastic packages.
  • FIGURE 1 is a schematic view illustrating a procedure for forming a skinned foamed plastic sheet for use in the invention
  • FIGURE 2 is a view along the line 2-2 of FIGURE 1',
  • FIGURE 3 is a schematic view illustrating an alternative procedure for making a sheet for use according to the invention.
  • FIGURE 4 is a view taken along the line 44 of FIG- URE 3;
  • FIGURE 5 is a view, partially broken away in section, of a cigarette package vacuum formed from the sheet of FIGURE 1;
  • FIGURE 6 is a View of a cigarette package blow molded from a skinned foamed vinylidene chloride resin
  • FIGURE 7 is a view of a shallow drawn package according to the invention.
  • FIGURE 8 is a view showing the apparatus for making the package of FIGURE 7. 7
  • FIGURE 1 of the drawings there was provided a mixture of 50 parts of high impact polystyrene (Foster Grants Tuflex 216, polystyrene modified with 5% polybutadiene) and 50 parts of regular crystal polystyrene (Koppers D'ylene 8). This mixture is called hereinafter Composition A.
  • Composition A 100 parts of Composition A were tumbled with 2 parts of Celite (diatomaceous earth) containing absorbed pentane (the Celite-pentane material was made up of 1 part Celite and 1 part pentane). There were then added 0.5 part of Bayol 35, 0.3 part of powdered anhydrous citric acid, 0.4 part of powdered sodium bicarbonate and 4 parts of leafed aluminum pigment having an average leaf size of 2 microns maximum dimension and an average thickness of the lesser of the length or width.
  • This mixture was placed in the hopper 2 of extruder 4.
  • the mixture was heated in the barrel portion 6 of the extruder where it was softened and kneaded with the aid of a screw (not shown).
  • the plastic mixture was extruded at a temperature of 150 C. as a sheet 8 through slot opening 10in the die portion 12 of the extruder.
  • the sheet foamed as it was formed.
  • the top surface 14 of the sheet was rapidly chilled with an air blast at C. and 80 ft./sec. from nozzle 18 and the bottom surface 16 of the sheet was rapidly chilled with an air blast at 20 C. and 60 ft./sec.
  • the main portion was slightly higher than the height of the cigarettes 36 which were placed therein.
  • the main portion 34 was formed with grooves 38 near the open end 40 thereof.
  • the cover portion 42 was slid onto the main portion.
  • the cover 42 was formed with ridges 44 which mated with the grooves vacuum molded into the base. As the cover was slid onto the base the ridges 44 near the open end of the cover engaged the grooves near the open end of the base. Sufficient tension was provided so that the ridge snapped into the groove and maintained a tight seal.
  • the ridge had an elevation of 10 mils with respect to the surrounding surface. The use of ridges elevated only 5 mils also can be employed.
  • the overall dimensions of the package were an overall thickness of 25 mils, an inner, unfoamed, non-porous, impervious skin 46 of 4 mils, an outer, unfoamed, nonporous, impervious skin 48 of 7 mils, a foamed core 50 of 14 mils and an overall density of 35 lbs./ cu. ft.
  • the vacuum former 32 was of the conventional type.
  • the top and bottom portions 42 and 35 of the package were separately formed from the hot sheet using a vacuum of 10 mm. Hg and a male assist plug.
  • FIGURE 3 there was mixed with 100 polyethylene (Alathon A14 molecular weight 20,000, density 0.915) and 4 parts of diazoaminobenzene. This mixture was placed in extruder where it was heated to 110 C., softened and kneaded with the aid of a screw. It was extruded as a sheet 62 through slot opening 64 in the die portion 66 of the extruder. The sheet commenced to foam as it formed from the extruder. The top surface 68 of the sheet was rapidly chilled with an air blast at 15 C. and 70 ft./sec. from nozzle 72 and the bottom surface 70 of the sheet was rapidly chilled with an air blast at 15 C., and 70 ft./sec.
  • the coating was applied from a 7% solution of Saran F-12O (vinylidene chloride-acrylonitrile copolymer, 80:20 by weight) in methyl ethyl ketone by means of applicator which was dipped in the saran solution held in reservoir 92.
  • the sheet 62 having upper and lower skins and an upper coating of saran, integral with the upper skin 76, then went into drying oven 94 to remove the solvent.
  • the sheet was then converted into a cigarette package similar to that shown in FIGURE 5, except that it has an external coating of saran, by use of a vacuum mold such as vacuum former 32 of FIGURE 1.
  • FIGURE 6 illustrates a blow molded cigarette case.
  • Both the top half and the bottom half 102 of the cigarette case were made from parisons of vinylidene chloride-vinyl chloride copolymer (85: 15). Each parison comprised a foam core 15 mils thick integrally united to inner and outer skins 3 mils thick.
  • the halves of the cigarette package were then blow molded using conventional techniques while the parisons were still hot using a blowing pressure of 35 psi.
  • the wall of both the upper and lower halves of the package was made of a foamed vinylidene-chloride-vinyl chloride copolymer core 104 integrally united to a non-porous, unfoamed, tough inner skin 106 of vinylidene chloride-vinyl chloride copolymer and a non-porous, unfoamed, tough outer skin 108 of vinylidene chloride-vinyl chloride copolymer.
  • the upper half 100 was slid over the crinkle 112 in the lower half 102.
  • the two halves were then heat sealed together, e.g., with a split rectangularly shaped heating element. The sealing was done along the juncture of the lower edge 114 of the top half of the package and the area 116 just below the crinkle. In this manner a perfect air seal was prepared.
  • a tear strip 118 can be provided.
  • FIGURES 7 and 8 there was provided a sheet of foamed polypropylene having an upper non-porous, unfoamed, tough skin, a lower non-porous, unfoamed, tough skin and a foamed core. Each skin was 3 mils thick and the core was 30 mils.
  • the left hand portion 134 of the mold was designed to form the bottom section 136 of the cigarette package 137 and the right hand portion 138 of the mold was designed to form the shallower top section 140 of the cigarette package. As can be seen from FIGURE 8, only a very shallow draw is required.
  • the mold is provided with a stamping ring 142 for forming the edges of the package bottom 136.
  • stamping tool 144 for thinning the polyethylene sheet or web 130 in the hinge area 146 joining the halves of the package.
  • the hinge area has a thickness of one-third that of the bottom of the package.
  • stamping ring 148 for forming the edges of the package top 140. Additionally a cutting edge 150 is provided on the stamping ring 142 to cut the package bottom out of the sheet and a cutting edge 152 is provided on the stamping ring 148 to cut the package top out of the sheet.
  • the package is formed by passing the sheet 130 of thermoplastic skinned foam polypropylene preheated to forming temperature over mold 132.
  • stamping rings 142 and 148 and stamping tool 144 are lowered into contact with the sheet.
  • Simultaneously male plugs 158 and 160 are lowered into the bottom and top forming portions of the mold to assist in the vacuum forming of the shallow rigid box.
  • the thin web 146 formed between the package halves by the stamping tool 144 can be readily folded to serve as a hinge as shown in FIGURE 7.
  • the package bottom is molded so that the sidewalls such as 164, 166 and 167 are vertical in their lower portion.
  • the vertical portion merges into a short, inwardly sloping portion 162 which terminates in a vertical upper portion such as 168, 170 and 172.
  • the inward slope 162 insures that the top will fit tightly and smoothly over the bottom.
  • Cigarettes 174 are placed in the bottom portion of the package and the portion 145 between the two halves folded to form a hinged joint.
  • the shallower or cover portion 140 is then fitted over the larger or base portion. As indicated, the cover portion fits over the base portion substantially to the bottom of the inwardly sloping portion 162 of the bottom sidewalls.
  • the cigarette package can then be heat sealed to insure freshness of the cigarettes.
  • a saran e.g.
  • vinylidene chloride acrylonitrile copolymer 80:20) coating can be applied from methyl ethyl ketone solution to the outside of the package to further retard infiltration of air. If the saran coat is employed preferably the polypropylene is treated first with an oxidizing agent, e.g., a gas flame or corona discharge in the manner set forth previously.
  • an oxidizing agent e.g., a gas flame or corona discharge in the manner set forth previously.
  • the process of preparing the flat cigarette package in FIGURES 7 and 8 results in the formation of a lightweight rigid box.
  • the package can be encased in cellophane, biaxially oriented rubber hydrochloride film or biaxially oriented irradiated saran coated polyethylene film (12 megarads of irradiation) although this is not necessary.
  • FIGURE 7 thus provides a shallower cover portion and a deeper base portion contiguously thermoformed from a single sheet of thermoplastic material.
  • the example uses polypropylene sheeting which has a foamed core integrally united to upper and lower non-porous skins it is possible to operate with only a single skin-either upper or lower.
  • thermoplastic materials e.g. 20 mil polypropylene, can be employed without any foaming.
  • Containers for other materials can be formed by the procedure shown in FIGURE 7.
  • an egg carton from a polypropylene foamed sheet having at least one external, unfoamed skin and preferably two external unfoamed skins using such procedure.
  • the skinned foamed cigarette package as described in connection with FIGURE 8 there can be dispersed oriented metal leafing, e.g. 4% of aluminum leafing, throughout the sheet used to form the package.
  • the foamed package with or without the leafing can have a thin layer of saran, e.g. Saran F-120, applied to one or both exposed surfaces. The saran coating can be applied either before or after forming the package.
  • Cigarettes packaged in a container said container being impermeable to air and water vapor, said container comprising a foamed plastic layer integral with at least one unfoamed, non-porous skin of said plastic and oriented leafing pigment dispersed throughout said plastic, said pigment being more concentrated on the exterior surfaces of the container.
  • Cigarettes packaged in a container comprising 1) a foamed thermoplastic polymer core, (2) a substantially unfoamed, outer skin integral with said core, and (3) a substantially unfoamed inner skin integral with said core, said core comprising 50 to 94% of the total thickness of the skins and core and oriented metal leafing pigment dispersed throughout said walls whereby said container is impervious to air and water vapor, said metal leafing having a thickness less than the smaller of its width or length, said pigment being more concentrated on the exterior surfaces of the container.
  • Cigarettes packaged according to claim 3 wherein the plastic is selected from the group consisting of styrene polymers, polymers of an olefin having 23 carbon atoms, vinyl chloride polymers and vinylidene chloride polymers.
  • Cigarettes packaged in a container the walls of said container comprising 1) a foamed thermoplastic hydrocarbon polymer layer, (2) at least one substantially unfoamed skin of said polymer integral with said layer, and (3) a thin layer of a vinylidene chloride polymer directly coating at least one skin whereby said container is impervious to air and water vapor.
  • Cigarettes packaged in a container comprising 1) a foamed thermoplastic hydrocarbon polymer core, (2) a substantially unfoamed outer skin of said polymer integral with said core, (3) a substantially unfoamed inner skin of said polymer integral with said core, and (4) a thin layer of saran directly coating at least one of said skins whereby said container is impervious to air and water vapor.
  • a shallow container of a thermoplastic material comprising contiguous thermoformed cover and base portions united by a hinged joint of a foamed thermoplastic polymer layer integral with at least one unfoamed nonporous skin of said polymer and wherein oriented leafing pigment is dispersed throughout said polymer, said pigment being more concentrated on the exterior surfaces of the container.
  • a container according to claim 9 wherein the plastic is polypropylene.
  • thermoplastic rectangular container comprising contiguously thermoformed cover and base portions united by a hinged joint, the lower portion of the walls of said base portion extending vertically upward, said lower portion terminating in an upward and inwardly inclined portion and the top portion of said walls extending vertically downward to join said inclined portion, said cover portion fitting snugly around said top portion, said hinged joint being substantially thinner than said cover and base portions, said container comprising a foamed thermoplastic polymer integral with at least one unfoamed, nonporous skin of said polymer.
  • thermoplastic container according to claim 12 made of polypropylene wherein said container comprises a foamed thermoplastic polypropylene layer integral with at least one unfoamed, non-porous skin of said polypropylene.
  • a shallow container of a thermoplastic material comprising contiguously thermoformed cover and base portions united by a hinged joint of a foamed thermoplastic polymer layer integral with at least one unfoamed non-porous skin of said polymer, oriented leafing pigment being dispersed throughout said polymer and a coating of saran being on said skin.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
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US322161A 1963-11-07 1963-11-07 Cigarette package Expired - Lifetime US3236373A (en)

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US3517802A (en) * 1968-07-16 1970-06-30 Patrick Petrie Watch band calendar and dispenser
US3547761A (en) * 1967-12-29 1970-12-15 Rasmussen O B Extruded sheet material
WO2005105904A1 (de) * 2004-04-30 2005-11-10 Gerro Plast Gmbh Labels Mehrlagige, vorzugsweise polystyrol-basierte schaumfolie
WO2013168083A1 (en) * 2012-05-09 2013-11-14 Illycaffe' S.P.A. Forming apparatus and method and object thus made
US20220299255A1 (en) * 2018-10-31 2022-09-22 Whirlpool Corporation Polymer trim breaker having gas-blocking flakes and an epoxy coating

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FR2318725A1 (fr) * 1975-07-24 1977-02-18 Charbonnages Ste Chimique Procede d'obtention d'une feuille en polypropylene allege et feuille obtenue par ce procede
GB2126643B (en) * 1982-09-16 1985-09-25 Micro & Precision Mouldings Moulded plastic component

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US1950740A (en) * 1929-05-30 1934-03-13 Muller Carl Wilhelm Cigarette carton
US2387243A (en) * 1941-11-04 1945-10-23 Wilbur W Castor Flake for decorative and protective coatings
US2552641A (en) * 1946-01-12 1951-05-15 Willard L Morrison Heat insulated container having foamed plastic insulation
US2670501A (en) * 1951-08-24 1954-03-02 Us Rubber Co Method of forming plastic material
DE936113C (de) * 1942-12-15 1955-12-07 Bayer Ag Verfahren zur Herstellung von Leichtstoffen fester oder elastischer Natur
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US3125213A (en) * 1964-03-17 keating
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US3125213A (en) * 1964-03-17 keating
US1950740A (en) * 1929-05-30 1934-03-13 Muller Carl Wilhelm Cigarette carton
US2387243A (en) * 1941-11-04 1945-10-23 Wilbur W Castor Flake for decorative and protective coatings
DE936113C (de) * 1942-12-15 1955-12-07 Bayer Ag Verfahren zur Herstellung von Leichtstoffen fester oder elastischer Natur
US2552641A (en) * 1946-01-12 1951-05-15 Willard L Morrison Heat insulated container having foamed plastic insulation
US2951246A (en) * 1946-01-30 1960-08-30 Halpern Otto Absorbent for electromagnetic waves
US2737503A (en) * 1950-11-17 1956-03-06 Goodrich Co B F Method of making an expanded or cellular polyvinyl chloride composition
US2670501A (en) * 1951-08-24 1954-03-02 Us Rubber Co Method of forming plastic material
US3084086A (en) * 1958-06-02 1963-04-02 Fred T Roberts & Company Method of making a reinforced molded flexible hose
US3088166A (en) * 1958-10-20 1963-05-07 Lavorazione Mat Plastiche Sas Method and apparatus for sheathing a structural member with a synthetic thermoplastic material
US3063549A (en) * 1961-08-14 1962-11-13 Brunswick Corp Protective containers for holding microscope slides and similar fragile devices
US3133661A (en) * 1962-10-15 1964-05-19 Airmold Plastics Inc Hinged plastic closure for containers

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3547761A (en) * 1967-12-29 1970-12-15 Rasmussen O B Extruded sheet material
US3517802A (en) * 1968-07-16 1970-06-30 Patrick Petrie Watch band calendar and dispenser
WO2005105904A1 (de) * 2004-04-30 2005-11-10 Gerro Plast Gmbh Labels Mehrlagige, vorzugsweise polystyrol-basierte schaumfolie
WO2013168083A1 (en) * 2012-05-09 2013-11-14 Illycaffe' S.P.A. Forming apparatus and method and object thus made
US10173362B2 (en) 2012-05-09 2019-01-08 Illycaffe' S.P.A. Forming apparatus and method and object thus made
US20220299255A1 (en) * 2018-10-31 2022-09-22 Whirlpool Corporation Polymer trim breaker having gas-blocking flakes and an epoxy coating

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