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WO2025019243A1 - Procédé et composition fournissant une barrière à l'alcool améliorée pour des applications d'emballage en papier - Google Patents

Procédé et composition fournissant une barrière à l'alcool améliorée pour des applications d'emballage en papier Download PDF

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Publication number
WO2025019243A1
WO2025019243A1 PCT/US2024/037462 US2024037462W WO2025019243A1 WO 2025019243 A1 WO2025019243 A1 WO 2025019243A1 US 2024037462 W US2024037462 W US 2024037462W WO 2025019243 A1 WO2025019243 A1 WO 2025019243A1
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Prior art keywords
coating
paper
blank
edge
coated
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English (en)
Inventor
Christopher R. Tilton
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SMART PLANET Tech Inc
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SMART PLANET Tech Inc
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Publication of WO2025019243A1 publication Critical patent/WO2025019243A1/fr
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Classifications

    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • 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
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/24—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H21/16—Sizing or water-repelling agents

Definitions

  • the present disclosure relates to a method and composition providing multi-dimensional and multi-surface barrier layer(s) applied to a packaging paper blank specifically used for open top rigid packaging used for cups.
  • the coatings may be used for the prevention of fiber discoloration and deterioration resulting from liquid or alcohol permeation.
  • the present disclosure provides a method of providing finished packaging barrier protection using a coating process preventing edge cut permeation.
  • the methods used include improving cross linking density by applying post curing heat and pressure which improves barrier and adhesion performance.
  • this method is particularly useful on foodservice cups and trays, such that they require a barrier on both flat surfaces at one angle and barrier protection on a second axis, applied to the edge cuts. Therefore, the barrier layers are applied at more than one angle (e.g., multiple fiber surfaces).
  • the paper blanks include outer facing flat surfaces with cut edges normally die cut at ninety-degree angles, however, could also be cut in the range of about 30 to 140 degree angles from the outer facing surfaces.
  • the coatings can be used to prevent permeation when the inner edge of the cup blank is cut from the top and from the front edge of the blank, separating the edge into two surfaces which may then be folded and bonded before the cup is formed. Further, the coatings can provide a heat seal and alcohol barrier inside the folded and sealed edges of the finished package or cup.
  • Foodservice packaging is used for a variety of fast-food applications having short “shelf life” requirements.
  • the packaging includes, for example, hot cups, cold cups, trays, etc.
  • the outer facing paper layers are coated for barrier protection and individual components are typically cut to specification from rolls and sheets, creating blanks that are then formed and sealed into finished packages. These “cut to size package parts” are known as flat “blanks”.
  • a hot cup might be comprised of a flat blank for the side wall that is then sealed and formed into a formed bottom flat blank, resulting in a completed cup.
  • This can be the case with a wide variety of packages requiring paper blanks that are used in the forming, sealing, or gluing process.
  • a paper cup sidewall blank has key shortcomings, created by the process of cutting the blanks from paper sheets by using a knife and die cutting. This non coated and exposed side section is known as the “cut edge” or “cut score line”.
  • the unprotected cut edge is vulnerable to barrier permeation from liquids along the cut line, thus facilitating rapid and direct permeation into the fibers. Cut edge permeation rapidly advances across the inside of the fiber structure and into the interfacial surface between the coatings and the fibers. The fibers become wet from the attacking liquid and the package begins to lose strength, reducing strength and shelf life. Also, as the liquid proceeds further into the fiber layer the compromised fibers become discolored and very unattractive to the consumer, particularly in the case of consumer liquid and food packaging.
  • the discoloration can be placed into categories, such as grayish-black, brownish-black, bluish black, grayish- white, brownish white, bluish white.
  • the speed of discoloration depends upon the type of paper fiber, the thickness, alcohol content, paper porosity, and fiber sizing. Examples include a cup shaped package formed from solid fiber with one or more extrusion coated polyolefin barrier coatings with paper coat weights from 10 gsm to 28 gsm, applied to one or more outer facing sides of the formed sidewall and up to two sides of the bottom cup stock.
  • a representative sampling of cups was filled with beverage solutions containing a range of alcohol content from 10% to 55% by volume of alcohol, the alcohol having a density in the range of .77 to .82 g/cm3.
  • the cup having a Tappi Brightness of from 85 to 95, a CIE whiteness of from 65 to 95, a fiber density of between .3 to .7 g/cml, and Elmendorf tear strength of approximately 5-25 mN, the cup paper weight ranging from 129 lbs/msf to about 273 lbs/msf with calipers from .010” to .028” and a fiber moisture content from 2% to 18%.
  • the cut edge coating permeates horizontally into the open fibers at depths from about 10-80 microns from the outer edge.
  • the next step may be applying post curing heat and pressure in the cut edge areas to increase polymer cross linking density, thus creating a higher barrier performance that protrudes from the cut edge deeply into the fibers layer, therefore, greatly reducing or eliminating alcohol permeation due to edge wicking.
  • the enhanced permeation barrier may also reduce or eliminate discoloration, adhesion, and tensile strength of the package due to alcohol permeation into the fibers.
  • the methods and compositions of the present disclosure may reduce or eliminate coating surface permeation on the flat blank planar surface interfacial areas.
  • It is a further object of the present disclosure to improve cut edge barrier performance by applying post curing heat and pressure that improves coatings cross link density.
  • Fig. 1 is an illustration of a top view of a rectangular blank showing from outer planar coated surface 1 bound directly to the fiber layer 2 by polyolefin extrusion coating.
  • Fig.2 is an illustration of a perspective view of a blank with both straight and radius edges having three layers.
  • Fig.3 is an illustration of a top perspective view of an irregularly shaped blank having one top fiber layer planar surface 6 bound to a top coating layer and one bottom fiber planar surface 7.
  • Fig.4 is an illustration of a cross-section view of the embodiment shown in FIG.1 of an example blank side view showing a flat planar outer facing coating layer 1 bound along the interfacial surface of outer facing fiber layer 2.
  • Fig.5 is an illustration of a top front perspective view of a square shaped cut blank having one coating layer and one fiber layer.
  • Fig.6 is an illustration of a perspective view of an example showing a section of the seam area after the skiving knife has cut and separated the seam in preparation for folding and sealing.
  • Fig.7 is an illustration of a front view of the inside of the post sealed package wall blank seam area.
  • Fig.8 is an illustration of a top view of a reverse folded sidewall package blank.
  • DETAILED DESCRIPTION [0028]
  • an object that is “substantially” located within a housing would mean that the object is either completely within a housing or nearly completely within a housing.
  • the exact allowable degree of deviation from absolute completeness may in some cases depend on the specific context. However, generally speaking, the nearness of completion will be so as to have the same overall result as if absolute and total completion were obtained.
  • the use of “substantially” is also equally applicable when used in a negative connotation to refer to the complete or near complete lack of an action, characteristic, property, state, structure, item, or result. [0037]
  • the terms “approximately” and “about” generally refer to a deviance of within 5% of the indicated number or range of numbers.
  • the term “approximately” and “about”, may refer to a deviance of between 0.001-10% from the indicated number or range of numbers.
  • Step 1 Coat on one or two sides a paper sheet or roll with polymer containing coating(s), the coating(s) applied on the flat outer facing planar surfaces of the roll or sheet to include extrusion coating or extrusion lamination, dispersion, or emulsion coatings.
  • the dispersion and emulsions coating methods include blade coating, air knife coating, roll coating, size press coating, curtain coating.
  • Step 2 Apply acrylic or acrylic-latex dispersion or emulsion coatings and other coatings comprised of the chemicals described herein, on the cut score edge at approximately 90-degree angle. However, depending on die design, applied in the range of 30 to 140 degrees, from the flat planar surface of the blank. The coating is applied and cured at the cut blank edges, the edges having exposed fibers that are unprotected from alcohol permeation. This coating application is done during the process of blank stacking, moving, or transporting to the package forming and converting station. The acrylic or acrylic-latex barrier containing coatings are applied with weights from 3 gsm to 20 gsm.
  • the coating then seeps into the fibers to about 3 to 80 microns from the cut edges, creating cut edge horizontal as well as vertical permeation resistance.
  • the coating can be applied using spray, single and multiple rollers, pads, flexible plates, and cylinders among many other techniques know to the art.
  • a drying and curing station could be located after the coating material is applied to the fiber, curing temperatures between approximately 100°C (212°F) to 200°C (392°F) in hot air ovens, drying sections, or drying tunnels.
  • the packaging blank has 360-degree barrier protection along two axes, diminishing or preventing liquid permeation.
  • Dispersing Agents are chemicals added to the coating formulation to ensure proper dispersion and stabilization of the pigments or other solid particles. They help prevent settling or clumping of the particles, ensuring uniform distribution within the coating. Common dispersing agents include polymeric dispersants and surfactants.
  • Thickeners or rheology modifiers may be added to control the viscosity and flow characteristics of the coating. They help achieve the desired consistency and prevent sagging or running during application.
  • Common thickening agents include cellulose derivatives, acrylic thickeners, and associative thickeners.
  • Coalescing agents Coalescing agents may be added to aid in the film formation process of dispersion and emulsion coatings. They promote the fusion of polymer particles during drying, leading to the formation of a continuous film.
  • Common coalescing agents include glycol ethers, such as ethylene glycol monobutyl ether (EGBE) or propylene glycol ethers.
  • Surfactants such as ethylene glycol monobutyl ether (EGBE) or propylene glycol ethers.
  • Surfactants are surface-active agents that help to stabilize emulsions or dispersions by reducing surface tension and preventing coagulation or flocculation of particles. They assist in maintaining stability and ensure uniform coating properties.
  • Non-ionic, anionic, or cationic surfactants can be used depending on the specific coating requirements.
  • Crosslinkers may be added to improve the durability and chemical resistance of the coating. Crosslinkers promote the formation of chemical bonds between polymer chains, enhancing the coating's performance characteristics. Examples of crosslinkers include melamine-formaldehyde resins, isocyanates, and epoxy resins. These are the main chemical components typically found in dispersion and emulsion coatings.
  • the specific formulation and composition may vary depending on the desired coating properties, application requirements, and industry standards.
  • the viscosity of the coating is an important aspect when using dispersion or emulsion coatings for performance, processing, and application of the coating after die cutting is completed.
  • the coatings used in the edge barrier viscosity can range from about few hundred to a few thousand centipoise (cP)
  • medium-viscosity coatings typically have viscosities ranging from a few thousand to tens of thousands of centipoise (cP)T
  • These coatings offer a balance between flow and film build, making them suitable for various applications, including general industrial coatings, architectural paints, and certain specialty coatings. [0050] These coatings are thixotropic and may require additional mixing or dilution before application. high-viscosity coatings are commonly used in applications when gap-filling properties are desired, such as barrier coatings applied to the inconsistent and damaged blank edge fiber surface. Additionally, coatings that have a pH from about between 2 and 11 are preferably used for this barrier coating application.
  • polymer particles e.g., the mean particle size of polymer particles in dispersion and emulsion coatings used in this application, including particle size ranges from submicron (less than 1 ⁇ m) to several micrometers.
  • particle size ranges from submicron (less than 1 ⁇ m) to several micrometers.
  • smaller nanoparticles or larger microparticles may be utilized.
  • pigment particles can be used for cosmetic appearance and other reasons, such as inorganic pigments such as titanium dioxide having particle sizes ranging from a few hundred nanometers to micrometers.
  • Organic pigments on the other hand, can have smaller particle sizes, typically in the range of tens to hundreds of nanometers.
  • filler particles can have a wide range of particle sizes.
  • the polymer particles that can be used in the edge cut coating can include film-forming properties and contribute to the coating's adhesion, durability, and other desired characteristics.
  • polymer particles used include acrylics, styrene- butadiene (SB) latex, polyvinyl acetate (PVA), and polyurethane, PP polypropylene, PE, polyethylene, HDPE, high density polyethylene, PVDC, PVA, acrylics, polyolefin, styrene- butadiene, polyvinyl acetate polystyrene, polyacrylates, carboxylated styrene butadiene, acrylics, polyester, or mixtures thereof in emulsion or powder form.
  • alcohol permeation can be reduced or halted via mechanical means during and after the paper die cutting process, this is preferably done before forming and sealing the package.
  • the blank paper having a planar surface coating weight range from about 10 to 30 gsm can be coated on one or both flat sides of the blank using coatings and methods previously described in the patent specification.
  • the edge of blank wall can be crosscut, and the half thickness seam folded back over from the inside to the outside of the sidewall up to about 6.35 to 12.8 mm from the cut edge of the blank.
  • the 90-degree crosscut removes material from the blank seam such that it can folded and hemmed inside the cup. In this case, after folding and sealing, the exposed cut edge is now on the exterior of the cup instead of the inside of the cup which had previously allowed for alcohol permeation.
  • the round folded hemmed edge makes contact with the inside liquid and the folding action removes exposure of the inner blank cut edge from the cup liquid contents, thus preventing permeation through the blank inner cut edge.
  • the newly exposed bent edge must be properly coated to prevent permeation on the bent inner edge of the sidewall blank.
  • This mechanical process may be completed after a series of steps. First, during or after the die cutting process, the blank is cut with a skiving knife edge striking the blank outer surface from about a 25 degree to about at a 90-degree angle behind the liquid exposed cut edge of the sidewall blank.
  • the knife can then crosscut at two angles and separate the inner paper walls along the seam into two overlapping pieces, of which the inner flap piece is reverse folded (see Figs. 7 and 8).
  • the now exposed uncoated blank inner paper surface is sealed, adhered using adhesive, or cold glued to outer blank surface and the coated surface of the cross cut blank is sealed or adhered using adhesive, heat seal, or using cold glue to outer blank surface to the rough uncoated surface of the inner side of the blank forming a seal zone in the heat or adhesive seal area, this seam area being sealed and having a width from about 6.35 mm to 12.8 mm.
  • Another mechanical alternative not using a knife is possible.
  • the blank seam can be folded and sealed such that the cut edge is now on the outside of the sidewall and not exposed to liquids, thus preventing permeation when the cut edge was located in the inner blank.
  • the knife steel can be comprised of high carbon steel containing 0.6% to 1.0% carbon and having a hardness (HRC) of from about 50-70, also stainless steel can be used having approximately a 0.2% to 0.4% carbon and an approximate HRC of from 35-55, additionally Japanese steal can be used with a hardness in the approximate range of HRC 60-67.
  • HRC hardness
  • both mechanical processes rely on specific paper mechanical processes and specific production parameters.
  • the blank paper vertical seam that is heat or adhesive sealed would be the range of about 5.00 mm to about 10.00 mm wide
  • the coatings or adhesives used may have weights from about 8 gsm to about 35 gsm and paper calipers from about 300 to 700 microns, with a basis weight from about 110 gsm to 360 gsm.
  • the paper used can be comprised from about 15% to 70% of bleached sulphate having a density from about 0.3 - 0.9 g/cm3 and from about 20% to 60% chemical thermomechanical pulp having a density in the range of about 0.3 - 0.8 g/cm3.
  • the paper can comprise from about 75% to 100% solid bleached sulphate pulp, 75-100% unbleached chemical pulps, all pulp with densities used in the structure from about 0.3 - 0.9 g/cm3.
  • the paper used preferably may have the Table 3, 4, 5 characteristics, below. Tables 3-5 do not include paper fillers or paper coatings that can be applied after the paper making machine wet end manufacturing step has been completed.
  • thermoplastic polymers suitable for the mineral- containing composite include polypropylene, high density polyethylene combined with MS0825 Nanoreinforced POSS polypropylene, thermoplastic elastomers, thermoplastic vulcinates, polyvinylchloride, polylactic acid, virgin and recycled polyesters, cellulosics, polyamides, polycarbonate, polybutylene tereaphthylate, polyester elastomers,thermoplastic polyurethane, cyclic olefin copolymer; biodegradable polymers such as Cereplast-Polylactic acid, Purac-Lactide PLA, Nee Corp PLA, Mitsubishi Chemical Corp GS PLS resins, Natureworks LLC PLA, Cereplast-Biopropropylene, Spartech PLA Rejuven 8, resins made from starch, cellulose, polyhydroxy alcanoates, polycaprolactone, polybutylene succinate or combinations thereof, such as Ecoflex FBX 7011 and Ecovio L Resins from BASF, polyvinylchloride
  • Alcohol and alcohol mixed with other liquids can be rapidly absorbed by fibers and therefore the permeation quickly discolors and degrades the appearance and cosmetics of the packaging structure and negatively effects the structural integrity of the package.
  • the type of alcohol such as methanol, ethanol, isopropanol, or higher alcohols, may have different permeation rates due to variations in their molecular size, polarity, and interactions with paper fibers.
  • the composition of the paper including the type of fibers and any additives or coatings present, can influence alcohol permeation rates. Papers with more porous structures or higher cellulose content tend to have higher permeation rates. Paper thickness, thicker papers typically have a higher permeation capacity, allowing for a greater amount of alcohol to be absorbed.
  • the rate of permeation may still be influenced by factors such as the porosity and surface area of the paper. Temperature, humidity, and air circulation can affect the rate of alcohol permeation into paper. Higher temperatures and lower humidity levels generally enhance the permeation process due to increased molecular mobility and evaporation of solvents.
  • One purpose of the invention is to reduce permeation of alcohols in the density range of about .77 g/cm3 to about .82 g/cm3.
  • the invention is designed to reduce alcohol permeation when coating the inner blank wall cut edge into packaging structures containing fibers having the attributes illustrated in Table 6, below.
  • the package cut blanks can comprise multiple paper layers and have cut edges for each layer, each layer possibly exposed to liquids and therefore requiring multi axial protective coatings on the preformed packaging blanks, e.g., on the cut edges and also the flat.
  • the package blanks can weigh from about 129 lbs/msf to about 173 lbs/3msf and have a thickness from about .010” to about .026”.
  • TAPPI T 452 TAPPI Brightness
  • Tappi Brightness from about 25 to 75.
  • the paper cut blanks having a consistent brightness and strength with no discoloration or reduced tear strengths due to alcohol permeation wetness.
  • the paper blanks with a Tappi Brightness of from 79 to 95, a CIE whiteness of from 65 to 95, a fiber density of between .3 to .7 g/cml, and Elmendorf tear strength of from 5-25 mN, the blank paper weights from 129 lbs/msf to about 273 lbs/ msf with calipers from .010” to .026” and fiber moisture content from 2% to 8%.
  • the parent paper roll Prior to cutting the blanks, was polyolefin extrusion coated. The extrusion coatings applied to one or two sides of the planar surfaces of the blanks in the coat weight range of about 10 gsm to about 28 gsm.
  • the extrusion coatings included some having by weight up to 45% diatomaceous filler content.
  • the blank samples edges were cut to shape at 90 degrees from the outer facing sides of the blank planar surfaces.
  • the cut blank edges comprising circular, straight, straight with radius sections, and combinations thereof.
  • an acrylic containing dispersion coating was prepared having a PH within a range of about 2 to 11, a viscosity from about 150 to 250 cps, a coating particle molecular weight greater than 100,000, a TG in the range of 55 to 75 C, and post application density at 25 C from about .95 to about 1.15 g/cm3.
  • the dispersion coating was then applied to the exposed cut blank edges in weight ranges from about 3 to 20 gsm, with the coating seeping into the cut edge fibers from 10 to 80 microns for the outer edge of the cut blank, thus providing permeation protection inside the fiber structure of the blank.
  • the blanks Upon completion of the coating process, the blanks have a multi axial coating coverage. For example, axis one being the outer facing flat planar surface, axis two being the outer facing exposed edge of the cut blank, and the third axis having coating coverage along the varying cut edge angles formed through circular, straight, and radius edges of the blank cuts, or combination thereof. Adhesion and curing of the above coatings is preferably completed prior to the next step.
  • the coating was cured a second time along the outer blank edge areas.
  • This second curing step applied heat and pressure to the cut edge surface area up to 410 F, with pressures up to 2.5 mPA up to 0.5” from the outer exposed cut edges.
  • the heat and pressure applied simultaneously in time durations up to 4.25 seconds.
  • the secondary heat and pressure compressing and rapid curing the edge of the blank, improving cross-linking density across the linear outer edge and three dimensionally across the entire surface of the blank edge.
  • the minimum finished cross linking densities found in the edge cut area were from about 10 ⁇ 4 to 10 ⁇ 6 cross-links per nm3 to approximately 10 ⁇ 6 to 10 ⁇ 8 cross-links per nm3.
  • the packages were then exposed to a range of 88 mL liquid solutions containing from 15% to 55% by volume of alcohol, the alcohol having a density in the range of .77 to .82 g/ml.
  • the paper with a Tappi Brightness of from 70 to 95, a CIE whiteness of from 65 to 95, a fiber density of between .3 to .7 g/cml, and Elmendorf tear strength of from 5-25 mN, and a fiber moisture content from 2% to 18%.
  • the liquid permeation in the cup was observed at 15 minutes, 30 minutes, 1 hour, 2 hours, and 12-hour time frames.
  • the permeation rate of degradation and failure criteria was determined upon the total overall average surface area on the inner side of the planar surface and along the perimeter of the cut edges of the tested samples.
  • Terminal failure identified at 5% overall average discoloration of the inner package surface, a 5% overall reduction in surface brightness, a 5% or more reduction in whiteness, and a 5% tear strength reduction.
  • Example 1 sampling results and averages across the surface area of the samples are illustrated in Table 7, below.
  • Fig.1 is an illustration of a top view of a rectangular blank showing from outer planar coated surface 1 bound directly to the fiber layer 2 by polyolefin extrusion coating. Fig.1 illustrates four cut edges around the outer perimeter of the blank. Fig.1 shows the possibility of triaxial coating on several different surfaces, e.g., four cut edges and top coated surface 1.
  • Fig.2 is an illustration of a perspective view of a blank with both straight and radius edges having three layers.
  • Fig. 2 shows the blank with both straight and radius edges having three layers
  • layer 3 is an outer coated surface comprising dispersion or aqueous coatings
  • fiber layer 4 which is directly bound by a shared interfacial bonding surface.
  • a second coated surface 5 Directly bound to the bottom of fiber layer 4 is a second coated surface 5, which can be comprised of extrusion, dispersion, or emulsion coatings.
  • Fig. 2 illustrates multi axial coatings, for example, four layers of coating on the four cut edges of the blank, the top planar surface of the blank and the bottom planar surface of the blank.
  • Fig.3 is an illustration of a top perspective view of an irregularly shaped blank having one top fiber layer planar surface 6 bound to a top coating layer and one bottom fiber planar surface 7.
  • Fig. 3 illustrates multi-axial coating surfaces, comprised of two flat outward facing planar surfaces, and connected but individually shaped and not in a flat plane, outer cut edges. When applied, the cut edge coatings seeping from 3 to 80 microns horizontally into the fibers.
  • FIG. 4 is an illustration of a cross-section view of the embodiment shown in Fig. 1 of an example blank side view showing a flat planar outer facing coating layer 1 bound along the interfacial surface of outer facing fiber layer 2.
  • Fig.4 shows flat planar outer facing coating layer 1 and fiber surface 2 that is an example of a cut edge surface that is also shown in Figs.1, 2, 3, and 5, and, when coated, the coating seeping from 3 to 80 microns horizontally into the fiber layer(s).
  • Fig.5 is an illustration of a top front perspective view of a square shaped cut blank having one coating layer and one fiber layer.
  • Fig.5 shows one embodiment of a square blank 100 having four different edge cut surfaces 10, 11,12, 13, available for triaxial coatings, and shows one layer of coating on each side of the blank.
  • Fig.6 is an illustration of a perspective view of an example showing a section of the seam area after the skiving knife has cut and separated the seam in preparation for folding and sealing.
  • Fig.6 shows one embodiment of a section of the seam area of blank 600 after the skiving knife has cut and separated the seam in preparation for folding and sealing.
  • the outer blank paper surface 605 represents the inner side of the cup blank that is coating with a selection of identified chemicals found this specification and once folded along the axis of score line 603, the paper surface 604 is heat or adhesive sealed to blank paper surface 602.
  • paper surface 604 is coated with chemicals previously described for that purpose within this specification.
  • Seam edge 607 illustrated the opposite side from seam edge 603 and after folding, the line edge between 603 and 607 form the new interior package seam edge making contact with the liquid in the package, eliminating the cut edge and reducing alcohol permeation inside the package.
  • Fig.7 is an illustration of a front view of the inside of the post sealed package wall blank seam area.
  • Fig.7 shows blank 700 may be folded in on itself to create a package, such as a cup.
  • Fig. 7 shows and V indicates the crosscut and folded sections 704, 708, which may be adhesively, heat sealed, or otherwise bonded together, and hemmed into a continuous vertical seem from about 6.35mm to 7.8 mm width.
  • Fig. 7 also shows that section 704 is the cut and folded over portion of coated surface 702, which may then be bonded with surface 708.
  • Fig. 8 is an illustration of a top view of a reverse folded sidewall package blank. Fig. 8 shows that package blank 800 has an inner area 802 of the formed package containing a volume of liquid or solid product. Surface 804 is the inner planar surface of the coated blank 800 after forming the package. The blank 800 may also include coated outer planar surface 806 and cut edge 808, which, after reverse folding, will be on the outside of the package vertical seam, such that it is not exposed to internal liquid permeation.
  • blank 800 may have surface 810, which may be the outer coated blank planar surface location after the reverse fold.
  • surface 810 may be adhesive or heat sealed to the inner coated surface 804.
  • Fig. 8 also shows that the blank 800 may have coated outer blank surface 812, which, after reverse folding, may be sealed by a finished vertical seal to surface 804 and 810.
  • Fig. 8 also shows edge 814 (which may be referred to alternatively as a reverse fold or bend line), which may replace the cut edge on the inside of the cup formed from blank 800. Because there are no exposed fibers, edge 814 prevents alcohol permeation on the inside seam of the package.

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Abstract

Les procédés et les compositions de la présente divulgation concernent une ébauche d'emballage, ayant une ou plusieurs couches contenant des fibres et ayant des bords découpés à l'emporte-pièce. Les procédés et les compositions fournissent une protection barrière multisurface pour la perméation d'alcool et de liquide le long de multiples axes de l'ébauche d'emballage. L'ébauche d'emballage peut avoir de nombreuses surfaces exposées en fonction de la manière dont l'ébauche est conçue et découpée à partir d'une feuille ou d'un rouleau. Les procédés et les compositions fournissent une protection contre la perméation pour l'ensemble de l'emballage, notamment les surfaces plates et les surfaces de bord découpé qui sont en contact avec un liquide, en particulier de l'alcool, qui se trouvent enfermées ou à l'intérieur de la structure d'emballage finie. Ceci est accompli à la fois par le revêtement des ébauches et par des procédés structurels de découpe, de découpe à l'emporte-pièce et de techniques de pliage.
PCT/US2024/037462 2023-07-14 2024-07-10 Procédé et composition fournissant une barrière à l'alcool améliorée pour des applications d'emballage en papier Pending WO2025019243A1 (fr)

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Application Number Priority Date Filing Date Title
US202363513798P 2023-07-14 2023-07-14
US63/513,798 2023-07-14
US202418768751A 2024-07-10 2024-07-10
US18/768,751 2024-07-10

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WO2025019243A1 true WO2025019243A1 (fr) 2025-01-23

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996018544A1 (fr) * 1994-12-14 1996-06-20 International Paper Company Emballages possedant des bords vifs proteges et procede de fabrication
WO2007032719A1 (fr) * 2005-09-15 2007-03-22 Tetra Laval Holdings & Finance S.A. Bande d’étanchéité et récipient d’emballage comprenant une telle bande
US20090072014A1 (en) * 2007-09-18 2009-03-19 Eco-Fiber Solutions, Inc. Compostable packaging, methods and apparatus for manufacturing same
EP3278972B1 (fr) * 2016-08-05 2020-10-07 Alfabio S.r.l. Récipient de stockage de produits alimentaires
CN213733700U (zh) * 2020-08-17 2021-07-20 浙江新发现机械制造有限公司 一种防边渗的纸容器坯料及其纸容器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996018544A1 (fr) * 1994-12-14 1996-06-20 International Paper Company Emballages possedant des bords vifs proteges et procede de fabrication
WO2007032719A1 (fr) * 2005-09-15 2007-03-22 Tetra Laval Holdings & Finance S.A. Bande d’étanchéité et récipient d’emballage comprenant une telle bande
US20090072014A1 (en) * 2007-09-18 2009-03-19 Eco-Fiber Solutions, Inc. Compostable packaging, methods and apparatus for manufacturing same
EP3278972B1 (fr) * 2016-08-05 2020-10-07 Alfabio S.r.l. Récipient de stockage de produits alimentaires
CN213733700U (zh) * 2020-08-17 2021-07-20 浙江新发现机械制造有限公司 一种防边渗的纸容器坯料及其纸容器

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