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WO2008008576A2 - Boîtes en carton à renforts sélectifs - Google Patents

Boîtes en carton à renforts sélectifs Download PDF

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Publication number
WO2008008576A2
WO2008008576A2 PCT/US2007/070308 US2007070308W WO2008008576A2 WO 2008008576 A2 WO2008008576 A2 WO 2008008576A2 US 2007070308 W US2007070308 W US 2007070308W WO 2008008576 A2 WO2008008576 A2 WO 2008008576A2
Authority
WO
WIPO (PCT)
Prior art keywords
water
formulation
fiber
paperboard
carton
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2007/070308
Other languages
English (en)
Other versions
WO2008008576A3 (fr
Inventor
Vladislav A. Babinsky
William G. Lanier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WestRock MWV LLC
Original Assignee
Meadwestvaco Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Meadwestvaco Corp filed Critical Meadwestvaco Corp
Publication of WO2008008576A2 publication Critical patent/WO2008008576A2/fr
Publication of WO2008008576A3 publication Critical patent/WO2008008576A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D71/00—Bundles of articles held together by packaging elements for convenience of storage or transport, e.g. portable segregating carrier for plural receptacles such as beer cans or pop bottles; Bales of material
    • B65D71/06—Packaging elements holding or encircling completely or almost completely the bundle of articles, e.g. wrappers
    • B65D71/12—Packaging elements holding or encircling completely or almost completely the bundle of articles, e.g. wrappers the packaging elements, e.g. wrappers being formed by folding a single blank
    • B65D71/36—Packaging elements holding or encircling completely or almost completely the bundle of articles, e.g. wrappers the packaging elements, e.g. wrappers being formed by folding a single blank having a tubular shape, e.g. tubular wrappers, with end walls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/42—Coatings with pigments characterised by the pigments at least partly organic
    • 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
    • B65D2571/00—Bundles of articles held together by packaging elements for convenience of storage or transport, e.g. portable segregating carrier for plural receptacles such as beer cans, pop bottles; Bales of material
    • B65D2571/00123—Bundling wrappers or trays
    • B65D2571/00129—Wrapper locking means
    • B65D2571/00135—Wrapper locking means integral with the wrapper
    • B65D2571/00141—Wrapper locking means integral with the wrapper glued
    • 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
    • B65D2571/00—Bundles of articles held together by packaging elements for convenience of storage or transport, e.g. portable segregating carrier for plural receptacles such as beer cans, pop bottles; Bales of material
    • B65D2571/00123—Bundling wrappers or trays
    • B65D2571/00432—Handles or suspending means
    • B65D2571/00438—Holes
    • B65D2571/0045—Holes for hands
    • 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
    • B65D2571/00—Bundles of articles held together by packaging elements for convenience of storage or transport, e.g. portable segregating carrier for plural receptacles such as beer cans, pop bottles; Bales of material
    • B65D2571/00123—Bundling wrappers or trays
    • B65D2571/00432—Handles or suspending means
    • B65D2571/00456—Handles or suspending means integral with the wrapper
    • B65D2571/00469—Straps made between two handholes
    • 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
    • B65D2571/00—Bundles of articles held together by packaging elements for convenience of storage or transport, e.g. portable segregating carrier for plural receptacles such as beer cans, pop bottles; Bales of material
    • B65D2571/00123—Bundling wrappers or trays
    • B65D2571/00432—Handles or suspending means
    • B65D2571/00537—Handles or suspending means with stress relieving means
    • B65D2571/00549—Handles or suspending means with stress relieving means consisting of fold lines
    • 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
    • B65D2571/00—Bundles of articles held together by packaging elements for convenience of storage or transport, e.g. portable segregating carrier for plural receptacles such as beer cans, pop bottles; Bales of material
    • B65D2571/00123—Bundling wrappers or trays
    • B65D2571/00555—Wrapper opening devices
    • B65D2571/00561—Lines of weakness
    • B65D2571/00574—Lines of weakness whereby contents can still be carried after the line has been torn
    • 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
    • B65D2571/00—Bundles of articles held together by packaging elements for convenience of storage or transport, e.g. portable segregating carrier for plural receptacles such as beer cans, pop bottles; Bales of material
    • B65D2571/00123—Bundling wrappers or trays
    • B65D2571/00648—Elements used to form the wrapper
    • B65D2571/00654—Blanks
    • B65D2571/0066—Blanks formed from one single sheet
    • 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
    • B65D2571/00—Bundles of articles held together by packaging elements for convenience of storage or transport, e.g. portable segregating carrier for plural receptacles such as beer cans, pop bottles; Bales of material
    • B65D2571/00123—Bundling wrappers or trays
    • B65D2571/00709—Shape of the formed wrapper, i.e. shape of each formed element if the wrapper is made from more than one element
    • B65D2571/00722—Shape of the formed wrapper, i.e. shape of each formed element if the wrapper is made from more than one element tubular with end walls, e.g. walls not extending on the whole end surface
    • B65D2571/00728—Shape of the formed wrapper, i.e. shape of each formed element if the wrapper is made from more than one element tubular with end walls, e.g. walls not extending on the whole end surface the end walls being closed by gluing
    • 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
    • B65D2571/00—Bundles of articles held together by packaging elements for convenience of storage or transport, e.g. portable segregating carrier for plural receptacles such as beer cans, pop bottles; Bales of material
    • B65D2571/00123—Bundling wrappers or trays
    • B65D2571/00808—Inserts
    • B65D2571/00814—Inserts for reinforcing
    • 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
    • B65D2571/00—Bundles of articles held together by packaging elements for convenience of storage or transport, e.g. portable segregating carrier for plural receptacles such as beer cans, pop bottles; Bales of material
    • B65D2571/00123—Bundling wrappers or trays
    • B65D2571/00833—Other details of wrappers
    • B65D2571/00839—Integral reinforcements
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/66—Coatings characterised by a special visual effect, e.g. patterned, textured
    • D21H19/68—Coatings characterised by a special visual effect, e.g. patterned, textured uneven, broken, discontinuous
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/18—Reinforcing agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52—Additives of definite length or shape

Definitions

  • One method of achieving the strength requirements is to manufacture the entire carton from a paperboard which has the necessary thickness to provide the strength requirements for the handle area.
  • One drawback of this method is the waste of paperboard in the areas that do not require additional strength. Additionally, the shipping and handling costs of the paperboard carton increase when a thicker board is used.
  • U.S. Patent No. 7,195,804 describes a method of producing paperboard composite structure having improved wet tear strength suitable for use in packaging bottles of beverages.
  • the paperboard structure has a backing structure adhered to a paperboard layer, wherein the backing structure includes an oriented polymer film layer and a reinforcing scrim polymer layer bonded together by a thermal bonding polymer layer.
  • the oriented polymer film layer, the thermal bonding layer, and the reinforcing scrim polymer layer each individually comprise a synthetic condensation polymer.
  • This reinforcement method typically uses high cost polymeric or composite reinforcing materials.
  • the plastic coating or laminating to a paperboard substrate is commonly performed off-line from the papermaking process through a multiple-step process, thereby increasing the manufacturing cost.
  • the reinforcement may be selectively introduced to only the areas of paperboard bearing exerted stress when lifting.
  • U.S. Patent Application No. 2006/0,000,544 describes a method of producing cartons having one or more reinforcing strips laminated or adhered to a carton material using foamed adhesive.
  • the adhesive such as a water-based emulsion is applied in strips in either a continuous or non-continuous manner onto the paperboard substrates.
  • adhering bands of selective reinforcement at only the selected areas generally requires special equipments.
  • U.S. Patent No. 5,335,774 discloses a can carrier made of paperboard having the areas around cutout of the upper surface coated with waterproof coating to enhance water resistance property and thereby increasing the strength for the can carrier. Additionally, a reinforced thread, formed of a synthetic water resistant material, is bonded to the under surface of the paperboard to strengthen the can carrier. The method is quite complicated, since different modifications must be performed on each side of the paperboard to ensure sufficient strength requirement.
  • U.S. Patent No. 4,617,223 discloses a method of selectively reinforcing paperboard only in the critical areas, allowing thinner paperboard to be used for the remaining areas of the article.
  • the critical areas of the uncoated paperboard carton blank are impregnated with a polyisocyanate material, which reacts with hydroxyl groups within the paperboard to form a cured polyurethane reinforcement.
  • a polyisocyanate material which reacts with hydroxyl groups within the paperboard to form a cured polyurethane reinforcement.
  • heat may be introduced to reduce the cured time; therefore, additional capital and operation costs are required.
  • EP Patent Application No. 0,478,177 teaches a process for reinforcing paperboard to enhance strength properties by impregnating one side of the paperboard with a liquid reinforcing composition such as latex so that the reinforcing composition partially penetrates into the paperboard.
  • a vacuum force is used to allow a penetration to a depth of about 5-25% of the paperboard thickness.
  • the vacuum force and the reinforcing composition are applied only in those selected areas where such reinforcement is desired. While this process provides a paperboard carton with improved strength, a higher strength level is desired in order to minimize, if not eliminate, the carton failure due to an intensive stress exerted throughout the life cycle of the packaged goods. Additionally, it is desirable to reduce minor cracks and tears which detract from the carton appearance.
  • It is an object of this invention is to provide a process for reinforcing paperboard cartons that is cost effective and uses simple process. [0011] It is another object of this invention is to provide a composition suitable for imparting a selective reinforcement to the paperboard carton treated with such composition.
  • It is yet another object of this invention is to provide a reinforced paperboard carton having reinforced strength at the selected areas.
  • It is a further object of this invention is to provide a reinforced paperboard carton having reinforcement around the areas where a greater force is exerted when the carton is lifted and/or carried.
  • It is yet a further object of this invention is to provide a reinforced paperboard carton having minimized mechanical failure during shipping and handling throughout the life cycle of its packaged goods.
  • It is still a further object of this invention is to provide a reinforced paperboard carton having reduced minor cracks and tears during shipping and handling throughout the life cycle of its packaged goods.
  • It is yet still a further object of this invention is to provide a carton made of paperboard having lower basis weight (i.e., lighter and sometimes thinner) than that of the board used in the conventional paperboard cartons, yet the invention carton still has sufficient tensile strength and tensile energy adsorption to minimize carton mechanical failure.
  • the present invention relates to a paperboard carton for packaging application, such as carrier for cans or bottle beverages, having a selective reinforcement to enhance strength properties.
  • the selected areas of the paperboard carton are reinforced by coating with a water-based formulation containing a water-based polymer and fibers having a dimension of about 50 micron to about 2,000 micron in length and about 20 micron to about 1,000 micron in diameter.
  • FIG.l is a pictorial representation of a sleeve-type carrier prior to being lifted and while being lifted by its handle (U.S. Patent No. 4,785,991);
  • FIG.2 is a pictorial representation of a carrier having stress relieving arrangement at its handles (U.S. Patent No. 5,480,091);
  • FIG. 3 is a plan view of a plank for forming carrier, showing the selected areas to which the chemicals are applied;
  • FIG. 4 is a pictorial representation of a carrier, showing the selected areas to which the chemicals are applied;
  • FIG.5 is a graph showing the tensile energy adsorption of the paperboards coated, at different coat weights, with the invention water-based reinforced formulations containing polyvinyl alcohol polymer and different levels of the unbleached softwood fibers: 0.25% weight ( Formula A) and 0.50% weight (Formula B) based on the weight of the polymeric solution;
  • FIG.6 is a graph showing the strain property of the paperboards coated, at different coat weights, with the invention water-based reinforced formulations containing polyvinyl alcohol polymer and different levels of the unbleached softwood fibers: 0.25% weight ( Formula A) and 0.50% weight (Formula B) based on the weight of the polymeric solution;
  • FIG.7 is a graph showing the maximum loading values of the paperboards coated, at different coat weights, with the invention water-based reinforced formulations containing polyvinyl alcohol polymer and different levels of the unbleached softwood fibers: 0.25% weight ( Formula A) and 0.50% weight (Formula B) based on the weight of the polymeric solution;
  • FIG.8 is a graph showing stiffness of the paperboards, at different coating weights, coated with different coating compositions: conventional clay coating composition and the invention water-based reinforced formulation containing 1.5% by weight of MPC particles.
  • the reinforced paperboard carton of the present invention is obtained by applying a water-based reinforced formulation to the selected areas. Often these areas are the areas of the paperboard carton subjected to a high exerted stress during shipping and handling throughout a life cycle of the packaged goods inside the cartons.
  • the reinforced water-based formulation suitable for use in the present invention comprises:
  • Suitable water-based polymers for use in the present invention include, but are not limited to, polyurethane, poly(styrene -butadiene), poly(styrene- acrylic), polyacrylic, polyvinyl acetate, poly(acrylic-vinyl acetate), poly(acrylic-vinyl acetate), polyvinyl alcohol, epoxy, polyester, and combinations thereof.
  • Suitable fibers may include, but are not limited to, cellulosic fibers, synthetic fibers, and combinations thereof.
  • Cellulosic fibers of various natural origins may be used for use in the present invention. These include, but are not limited to, softwood, hardwood, cotton linter, vegetables, Esparto grass, bagasse, hemp, flax, sugar beet, citrus pulp, linen, jute, ramie, sisal, and combinations thereof.
  • Suitable synthetic fibers for use in the present invention include, but are not limited to, rayon, nylon, polyacetate, polyacrylic, polypropylene, polyethylene, polyester, polyvinyl alcohol, and combinations thereof.
  • Fibrillated fibers may also be used in the present invention.
  • Example of these fibrillated fiber include, but are not limited to, microcrystalline cellulose (MCC), micro fibrillate cellulose (MFC), microplatelet cellulose (MPC), and combinations thereof. These fibrillated fibers may be obtained by any method known in art. Examples of the production processes for MCC are reported in U.S. Patent No. 7,037,405; U.S. Patent Application No. 2005/2,39,744; and PCT Patent Application No. 2006/034,837. Examples of the production processes for MFC are reported in PCT Patent Application NO. 2004/055,267 and U.S. Patent No. 4,761,203. Example of the production process for MPC includes the process reported in U.S. Patent No.
  • the MPC fiber may be obtained by passing a suspension of fiber pulp through a high- friction grinder at about 2O 0 C to about 9O 0 C at atmospheric pressure.
  • the reinforced water-based formulation contains 80-99% by dry weight of water-based polymer and 1-20 % by dry weight of fibers.
  • the reinforced water-based formulation further includes starch to reduce the formulation cost and/or modify the viscosity of the formulation to achieve the most reliable and uniform application to the board surface.
  • the amount of starch in the invention reinforced water-based formulation may range from about 10% to about 60% by weight based on total weight of the formulation.
  • the reinforced water-based formulation of the present invention may further include additives such as surfactants, coalescence agents, buffers, neutralizers, thickeners or rheology modifiers, humectants, wetting agents, biocides, plasticizers, antifoaming agents, colorants, pigments, fillers, waxes, water repellants, slip or mar aids, anti-oxidants, and the like.
  • additives such as surfactants, coalescence agents, buffers, neutralizers, thickeners or rheology modifiers, humectants, wetting agents, biocides, plasticizers, antifoaming agents, colorants, pigments, fillers, waxes, water repellants, slip or mar aids, anti-oxidants, and the like.
  • the reinforced water-based formulation is applied only to the selected areas of the paperboard cartons where the acting stresses are more than 70% of the fatigue limit that causes fracture of board.
  • the areas applied with the reinforced water-based formulation is about 10% to about 30% greater than the predetermined area where the stress is about 70% to about 80% more than the critical stress level.
  • the distance between the point of maximum stress and the border of the areas applied with the reinforced water-based formulation is about 5% to about 20% greater than the areas where the stress is about 70% to about 80% more than the fatigue limit.
  • FEA analyses technique and related software packages may be used to determine the stress concentration area. For example, FIG. 3 and FIG. 4 showed that the paperboard beverage carton have high concentration of stress around the triangle areas located near handle slots.
  • the invention reinforced water-based formulation may be applied only on the topside or the backside of the paperboard board on the carton. Additionally, the reinforced water-based formulation may be applied to both side of the paperboard on the carton.
  • the reinforced water-based formulation of the present invention may be applied to substrate using known surface coating techniques. These include, not are not limited to, size press, air knife coating, roll coating, blade coating, curtain coating, spraying, and combinations thereof.
  • spray coating is used to apply the reinforced water-based formulation to the selected areas of the substrate.
  • a spray gun providing air-open, spring-close actuation that exceed 3,000 cycles per minute and applying a portion of the reinforced water-based formulation with frequency of about 1 millisecond may be used in the present invention.
  • the high frequency application of a portion of the reinforced water-based formulation allows the treated paperboard to be coated only in the targeted areas.
  • the reinforced water-based formulations consisted of an aqueous solution of polyvinyl alcohol SNP S-1514-L commercially available from SNP, Inc.; a non-ionic surfactant Surfynol 440 available from Air Products and Chemicals, Inc.; glycerin plasticizer; and unbleached softwood fibers.
  • the reinforced water-based formulations having two different amounts of unbleached fibers were produced.
  • the reinforced water-based formulations were spray coated onto the paperboard substrates at different coat weights: 2, 4, 6, and 8 lb/MSF.
  • the strength properties of the coated boards were determined and compared to those of the uncoated paperboard (i.e., coat weight of zero).
  • TAPPI Tensile energy absorption
  • EXAMPLE 2 The water-based reinforced formulation consisted of microplatelet cellulosic particles (MPC) and a standard aqueous clay coating of styrene-butadiene polymeric binder and titanium dioxide pigment.
  • MPC microplatelet cellulosic particles
  • the MPC particles had a volume average particle size range of about 20 microns to about 100 microns. They were produced by passing a suspension of fiber pulp through a high-friction grinder at about 2O 0 C to about 9O 0 C at atmospheric pressure.
  • the high-friction grinder SupermasscolloiderfS) commercially available from Masuko Sangyo Co.
  • the SupcrmasscolloidertJS ) grinder featured two ceramic nonporous plates with an adjustable gap. The upper plate was fixed, while the lower one was rotated at a high adjustable speed. The gap between plates was set at about 40 microns to about HO microns, and the rotation speed ⁇ f the lower plate at about 1.200 rpm to about 1.800 rpm. The fiber suspension was repeatedly subjected to grinding until the desired size of MPC particles is achieved. The particle size of MPC was determined using laser light diffraction Microtrac X-100 Tri-Laser-System.
  • MPC particles may be produced using other high- friction grinder devices and, if so, would also be suitable for producing the MPC particles.
  • the pigment used in the invention water-based reinforced formulation may be any other pigment types known in the arts.
  • the water-based reinforced formulation containing MPC particles was applied to a KRAFTP AK® an unbleached folding carton board available from MeadWestvaco Corp., at different coat weight.
  • the GM stiffness of the coated boards was determined and compared to those of paperboard coated with the standard clay coating (i.e., containing no MPC) at the same coat weights.
  • the folding carton board coated with the water-based reinforced formulation containing MPC particles showed significantly improved stiffness compared to the folding carton coated with a convention clay coating formulation (FIGURE

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
  • Wrappers (AREA)
  • Cartons (AREA)
  • Paper (AREA)

Abstract

La présente invention concerne une boîte en carton pour emballage, destinée par exemple au transport de canettes ou de bouteilles de boisson ; elle comporte des renforts sélectifs qui améliorent sa robustesse. Les zones sélectionnées de cette boîte sont renforcées en les enduisant d'une solution à base d'eau qui contient un polymère à base d'eau et des fibres d'une longueur d'environ 50 à 2 000 microns et d'un diamètre d'environ 20 à 1 000 microns.
PCT/US2007/070308 2006-07-13 2007-06-04 Boîtes en carton à renforts sélectifs Ceased WO2008008576A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US80728606P 2006-07-13 2006-07-13
US60/807,286 2006-07-13

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US10017624B2 (en) 2013-05-01 2018-07-10 Ecolab Usa Inc. Rheology modifying agents for slurries
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