EP4108106A1 - Papier d'emballage en bandes imprimé par héliogravure - Google Patents

Papier d'emballage en bandes imprimé par héliogravure Download PDF

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Publication number
EP4108106A1
EP4108106A1 EP22166022.8A EP22166022A EP4108106A1 EP 4108106 A1 EP4108106 A1 EP 4108106A1 EP 22166022 A EP22166022 A EP 22166022A EP 4108106 A1 EP4108106 A1 EP 4108106A1
Authority
EP
European Patent Office
Prior art keywords
fibrous crystalline
crystalline cellulosic
cellulosic material
base web
fibrous
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.)
Pending
Application number
EP22166022.8A
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German (de)
English (en)
Inventor
Timothy S. Sherwood
Jonathan L. DALTON
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.)
Altria Client Services LLC
Original Assignee
Altria Client Services LLC
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 Altria Client Services LLC filed Critical Altria Client Services LLC
Publication of EP4108106A1 publication Critical patent/EP4108106A1/fr
Pending legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24C—MACHINES FOR MAKING CIGARS OR CIGARETTES
    • A24C5/00—Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
    • A24C5/005—Treatment of cigarette paper
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D1/00—Cigars; Cigarettes
    • A24D1/02—Cigars; Cigarettes with special covers
    • A24D1/025—Cigars; Cigarettes with special covers the covers having material applied to defined areas, e.g. bands for reducing the ignition propensity
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D1/00—Cigars; Cigarettes
    • A24D1/04—Cigars; Cigarettes with mouthpieces or filter-tips
    • A24D1/045—Cigars; Cigarettes with mouthpieces or filter-tips with smoke filter means
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D1/00—Cigars; Cigarettes
    • A24D1/16—Bands for cigars or cigarettes
    • 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
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/52—Cellulose; Derivatives thereof

Definitions

  • the Ignition Propensity value for a smoking article should preferably be no greater than about 25%, when tested in accordance with ASTM E2187. More preferably, the IP value should be no greater than about 20%, and even more preferably no greater than about 10%. Accordingly, efforts to meet such limits are undertaken by various manufacturers of smoking articles.
  • a smoking article includes a tobacco rod comprising a column of filler and a wrapper surrounding the column of filler.
  • the tobacco rod has a circumferential direction, a longitudinal direction, a lit end, and a mouth end.
  • the wrapper includes a base web having generally parallel first and second side edges extending in the longitudinal direction and two ends extending in the circumferential direction wherein the base web is disposed around the column of filler such that the first and second side edges of the base web overlap and form a seam.
  • the base web includes at least one circumferentially extending banded region of fibrous crystalline cellulosic material thereon.
  • the fibrous crystalline cellulosic material is in a condition of having been gravure printed on the base web as a fibrous crystalline cellulosic slurry that comprises water, crystalline cellulose, and chalk wherein the fibrous crystalline cellulosic slurry has a solids content of about 10% or less by weight of the fibrous crystalline cellulosic slurry.
  • a wrapper for smoking articles includes a base web having generally parallel first and second side edges extending in a longitudinal direction, two ends extending in a transverse direction, and a plurality of longitudinally spaced banded regions of fibrous crystalline cellulosic material thereon, the fibrous crystalline cellulosic material having been gravure printed on the base web as a fibrous crystalline cellulosic slurry comprising water, crystalline cellulose, and chalk wherein the fibrous crystalline cellulosic slurry has a solids content of about 10% or less by weight of the fibrous crystalline cellulosic slurry.
  • a method of making banded wrapper paper for smoking articles includes advancing a base web to a first printing station and printing a first layer of a fibrous crystalline cellulosic slurry on the base web.
  • the fibrous crystalline cellulosic slurry includes water, crystalline cellulose, and chalk and has a solids content of about 10% or less by weight of the fibrous crystalline cellulosic slurry.
  • the printing includes applying the fibrous crystalline cellulosic slurry to a patterned gravure roller, and contacting the advancing base web with the patterned gravure roller to apply bands of the fibrous crystalline cellulosic slurry on the base web. Banded regions of fibrous crystalline cellulosic material are formed on the base web by drying the bands of the fibrous crystalline cellulosic slurry.
  • a smoking article 120 such as a cigarette, can comprise a tobacco rod 122 and a filter 132 attached to one end of the tobacco rod 122 with tipping paper 129.
  • the tobacco rod 122 comprises a column of shredded tobacco ("cut filler") and a piece of banded wrapper paper 123 disposed about the column of shredded tobacco.
  • the tobacco rod 122 has a lightable or lit end 124 and a tipped end 130, which, in the case of non-filtered cigarettes, is referenced as the mouth end 130 of the smoking article 120. Cut filler tobacco is an industry-standard designation.
  • the tobacco rod 122 has a generally circular cross section. In other example embodiments, the tobacco rod 122 can have an oval cross section or other non-circular shape cross section.
  • the wrapper 123 is sealed along a longitudinal seam to form the tobacco rod 122.
  • the smoking article 120 has a nominal length measured from the edge 131 of the tipping paper to the lit end 124 of the tobacco rod 122 along a longitudinal axis of smoking article 120.
  • that nominal length may lie in the range of about 60 to about 100 mm.
  • the banded wrapper paper 123 can include a base web 140 that may be made from flax, wood pulp, cellulose fiber, or the like.
  • the base web 140 has a plurality of bands of fibrous crystalline cellulosic material 126 on one or both sides thereof.
  • the bands of fibrous crystalline cellulosic material 126 are applied to a wire side of the base web 140 such that they are on the inside of the banded wrapper paper 123 when a piece of the wrapper 123 surrounds a column of shredded tobacco to form a tobacco rod 122.
  • base web 140 In the manufacture of base web 140 suited for the construction of the various embodiments of banded wrapper paper disclosed herein, such manufacture usually will include the production of a roll of base web 140 of several feet across (usually about 3 feet to about 5 feet across or in transverse dimension), which is then slit into ribbons that are wound on bobbins. Printing operations are conducted on the rolls, but could be conducted after slitting.
  • the bobbins themselves will have a transverse dimension equivalent to the width needed to make tobacco rods 122 or an integral number of such widths (e.g., 1, 2, or 4 of such widths).
  • the bobbins are adapted for use with typical cigarette making machines.
  • the banded wrapper paper has a dimension in cross-direction that takes into account the nominal circumference of the tobacco rod 122 and an overlapping seam. As a result, when the banded wrapper paper 123 is slit, the smoking article 120 formed therefrom always has a longitudinal seam with an exact overlap.
  • longitudinal refers to the direction along the length of a tobacco rod 122 (e.g., along the axis 134 in FIG. 1 ), or along the length of a base web 140 (e.g., arrow 142 in FIGs. 2 and 6 ) used in the preparation of banded wrapper paper 123 that, in turn, may be used to fabricate a tobacco rod 122.
  • transverse refers to the direction circumferentially around a tobacco rod 122 (see FIG. 1 ) or the direction perpendicular to the length of the base web 140 (e.g., arrow 144 in FIGs. 2 and 6 ) used in the preparation of banded wrapper paper 123 that, in turn, may be used to fabricate a tobacco rod 122.
  • a “band” or “banded region” 126 is an area (see FIG. 2 ) on an underlying base web 140 to which a fibrous crystalline cellulosic slurry has been printed to form a region of fibrous crystalline cellulosic material.
  • the phrase “leading edge” refers to the edge 146 (see FIG.
  • band spacing refers to the distance between the trailing edge 148 of one banded region 126 and the leading edge 146 of an adjacent banded region 126 on the base web 140 from which banded wrapper paper 123 is fashioned.
  • phase refers to the distance from the leading edge 146 of one banded region 126 to the leading edge 146 of an adjacent banded region 126.
  • the banded regions of fibrous crystalline cellulosic material 126 extend transversely across the base web 140 and are separated by regions free of added fibrous crystalline cellulosic material in the longitudinal direction 142 of the base web 140.
  • the banded regions of fibrous crystalline cellulosic material 126 are applied to the base web 140 of the banded wrapper paper 123 to obtain satisfactory or improved Ignition Propensity ("IP") characteristics for a smoking article including a piece of the banded wrapper paper 123 and optionally to also obtain improved Self-Extinguishment ("SE”) characteristics for the smoking article.
  • IP Ignition Propensity
  • SE Self-Extinguishment
  • the banded regions of fibrous crystalline cellulosic material 126 are arranged on the base web 140 such that at least one banded region of fibrous crystalline cellulosic material 126 is positioned between the lit end 124 and the tipped end 130 of the tobacco rod 122 in each finished smoking article 120 that includes the banded wrapper paper 123. In an example embodiment, at least two banded regions of fibrous crystalline cellulosic material 126 are positioned between the lit end 124 and the tipped end 130 of the tobacco rod 122 in each finished smoking article 120 that includes the banded wrapper paper 123. In an example embodiment, the banded regions of fibrous crystalline cellulosic material 126 extend circumferentially around the tobacco rod at one or more longitudinally spaced locations along the axis 134 thereof.
  • band or banded region "width” extends in a longitudinal direction along axis 142 of the base web 140 (see FIG. 2 ) or axis 134 of the tobacco rod 122, whereas a dimension in the circumferential direction will be expressed as “circumferential” or “transverse” or “in cross-direction.”
  • the "width" of the banded regions of fibrous crystalline cellulosic material 126 is measured in the longitudinal direction 142 from a leading edge 146 to a trailing edge 148 thereof.
  • the widths of the banded regions of fibrous crystalline cellulosic material 126 are each about 5 to about 9 mm (from the leading edge 146 to the trailing edge 148).
  • the widths of the banded regions of fibrous crystalline cellulosic material 126 are each about 5.5 to about 7.5 mm.
  • the widths of the banded regions of fibrous crystalline cellulosic material 126 are each about 6 to about 7 mm.
  • adjacent banded regions of fibrous crystalline cellulosic material 126 are longitudinally spaced by regions of the base web 140 free of added fibrous crystalline cellulosic material by a distance of about 20 mm to about 30 mm.
  • the phase i.e., the spacing from the leading edge 146 of one banded region 126 to the leading edge 146 of an adjacent banded region 126) is about 25 mm or 27 mm.
  • banded regions of fibrous crystalline cellulosic material 126 are depicted in this disclosure as solid bands, other configurations of the banded regions 126 on the base web 140 are within the spirit and scope of this disclosure, including, but not limited to, configurations in which the banded regions 126 have one or more areas free of added fibrous crystalline cellulosic material between the leading and trailing edges 146, 148 thereof.
  • the base web 140 of the banded wrapper paper 123 is permeable to air. Permeability of the base web 140 is typically identified in CORESTA units.
  • a CORESTA unit measures paper permeability in terms of volumetric flow rate (i.e., cm 3 /sec) per unit area (i.e., cm 2 ) per unit pressure drop (i.e., cm of water).
  • the base web 140 of the banded wrapper paper 123 has a permeability of at least about 20 CORESTA units and a basis weight of about 22 to 30 gram(s) per square meter in regions outside of the banded regions of fibrous crystalline cellulosic material 126.
  • the base web 140 of the banded wrapper paper 123 has a permeability of at least about 20 CORESTA units and a basis weight of about 25 to 27 gsm in regions outside of the banded regions of fibrous crystalline cellulosic material 126. In an example embodiment, the base web 140 of the wrapper 123 has a permeability greater than about 30 CORESTA in regions outside of the banded regions of fibrous crystalline cellulosic material 126.
  • the base web 140 of the wrapper 123 has a permeability of about 33 CORESTA with a basis weight of about 25 gsm in regions outside of the banded regions of fibrous crystalline cellulosic material 126. In an example embodiment, the base web 140 of the wrapper 123 has a permeability of about 46 CORESTA with a basis weight of about 25 gsm in regions outside of the banded regions of fibrous crystalline cellulosic material 126. In an example embodiment, the base web 140 of the wrapper 123 has a permeability of about 60 CORESTA in regions outside of the banded regions of fibrous crystalline cellulosic material 126.
  • the base web 140 of the wrapper 123 has a permeability of about 60 CORESTA with a basis weight of about 25 gsm in regions outside of the banded regions of fibrous crystalline cellulosic material 126. In an example embodiment, the base web 140 of the wrapper 123 has a permeability of about 60 CORESTA with a basis weight of about 26 gsm in regions outside of the banded regions of fibrous crystalline cellulosic material 126.
  • the base web 140 has a permeability greater than about 60 CORESTA with a basis weight of about 25 gsm or more, a permeability greater than about 80 CORESTA with a basis weight of about 25 gsm or more, or a permeability greater than about 100 CORESTA with a basis weight of about 25 gsm or more in regions outside of the banded regions of fibrous crystalline cellulosic material 126.
  • application of the fibrous crystalline cellulosic slurry to a base web 140 and drying thereof forms a banded region of fibrous crystalline cellulosic material 126 on the base web 140 that is effective to locally reduce the permeability of the base web 140 within the banded region 126.
  • bands of fibrous crystalline cellulosic slurry are printed on the base web 140 with a gravure roller 610 to reduce the permeability of the base web 140 within the banded regions of fibrous crystalline cellulosic material 126 to about 0 to about 12 CORESTA.
  • the permeability of the base web 140 within the banded regions of fibrous crystalline cellulosic material 126 is 7 CORESTA or less.
  • application of the fibrous crystalline cellulosic slurry to the base web 140 and drying thereof forms a banded region of fibrous crystalline cellulosic material 126 on the base web 140 that is effective to locally reduce diffusivity values of the base web 140 from a diffusivity level of about 2 cm/sec or greater (for the base web 140 in regions free of added fibrous crystalline cellulosic material) to a value in the range of 0.0 to about 0.2 cm/sec as measured by a Sodim CO 2 Diffusivity Tester (purchased from Sodim SAS of France).
  • the banded wrapper paper 123 is positioned within a clamping head so that the banded wrapper paper 123 separates two vertically arranged chambers.
  • the upper chamber contains a carrier gas, such as nitrogen, while the lower chamber contains a marker gas, such as carbon dioxide.
  • a carrier gas such as nitrogen
  • the lower chamber contains a marker gas, such as carbon dioxide.
  • the concentration of carbon dioxide within the nitrogen stream of the upper chamber is measured in an analyzer.
  • a computer then converts the detected level of concentration into a measure of diffusivity.
  • the diffusivity of the base web 140 within the banded regions of fibrous crystalline cellulosic material 126 is less than about 0.15 cm/sec.
  • the diffusivity of the base web 140 within the banded regions of fibrous crystalline cellulosic material 126 is about 0 to about 0.1 cm/sec (e.g. about 0.01 to about 0.09 cm/sec, about 0.02 to about 0.08 cm/sec, about 0.03 to about 0.07 cm/sec or about 0.04 to about 0.06 cm/sec).
  • each banded region of fibrous crystalline cellulosic material 126 may be formed by gravure printing a "layer" of a fibrous crystalline cellulosic slurry on the base web 140 to reduce the permeability of the base web 140 in the corresponding banded region.
  • the fibrous crystalline cellulosic slurry is aqueous.
  • FIG. 3 is a schematic view of a single stage printing apparatus 602.
  • a supply reel 601 supplies a blank base web 140 to a gravure printing station 602 where a banded region of fibrous crystalline cellulosic slurry is printed on the blank base web 140 by the gravure roller 610 and dried in a drier 634.
  • the drier 634 can include at least one steam can.
  • the drier 634 can include two steam cans wherein the base web 140 is advanced and pressed between the steam cans to reduce wrinkling of the base web 140.
  • the dried, patterned base web 140 then advances to a collection reel 608.
  • a wide base web 140 may be slit or divided by a slitter 635 into a plurality of narrower strips of base web that may be wound to form individual bobbins after the printing operation, where the bobbins have a width corresponding to that required for a smoking article 120.
  • the optional slitter 635 may be used on the base web 140 as that base web 140 leaves the printing station, or the slitter and slitting operation may be conducted at a different location.
  • Example embodiments of gravure printing the fibrous crystalline cellulosic slurry as disclosed herein enable high-speed printing on the base web 140.
  • "high-speed" printing refers to printing processes where the base web 140 advances through the printing process at a linear speed greater than about 300 feet/min.
  • the size of the crystalline fibers in the fibrous crystalline cellulosic slurry, and the deposition rate and viscosity of the fibrous crystalline cellulosic slurry are selected such that base web printing speeds of greater than 500 feet/minute can be achieved.
  • the gravure cylinder (roller) 610 includes a plurality of cells 700 arranged in a pattern corresponding to a band that is to be printed on the base web 140 by the gravure roller 610.
  • the gravure cylinder 610 includes two or more circumferentially spaced regions 701 of cells 700 wherein each region 701 of cells 700 is arranged in a pattern corresponding to a band that is to be printed on the base web 140 by the gravure roller 610.
  • adjacent regions 701 of cells 700 are circumferentially spaced by cell free surfaces 703 of the gravure roller 610 which extend a distance corresponding to the spacing between adjacent banded regions to be printed on the base web 140.
  • the pattern of cells 700 corresponding to banded regions are arranged in a chevron pattern wherein angle "A" at the tip or apex of the chevron is preferably greater than about 170 degrees.
  • angle "A" at the tip or apex of the chevron is preferably greater than about 170 degrees.
  • the cells of the gravure roller 610 can be formed by etching the gravure roller 610. Suitable etching processes and gravure cylinders can be obtained from Heliograph Holding GmbH.
  • photoresist 801 is applied to a metallic surface 800, and lasers 802 are used to activate the photoresist, which serves to mask areas where walls are desired.
  • the gravure roller 610 (shown in FIG. 4 ) has a plurality of cells 700 which have a generally hexagonal shape.
  • the cells 700 of the gravure roller 610 can have walls 702 ranging from about 12 to about 80 microns in width between adjacent cells 700 depending on the desired final volume of each cell 700. In an example embodiment, the cells 700 of the gravure roller 610 can have walls 702 ranging from about 12 to about 20 microns in width between adjacent cells 700. In an example embodiment, the gravure cylinder 610 can be formed such that certain cells within a region of cells are thinner than walls of other cells of the gravure roller 610. In an example embodiment, the cells 700 of the gravure roller 610 can have a generally circular shape. In an example embodiment, the depth of the cells 700 is uniform. However, in other embodiments, the depth of the cells 700 can vary.
  • the cells 700 are filled with the fibrous crystalline cellulosic slurry such that they may print the fibrous crystalline cellulosic slurry on the base web 140.
  • the cells 700 are sized to print dots of the fibrous crystalline cellulosic slurry which spread to form a continuous band of fibrous crystalline cellulosic material 126 on the base web 140 when the fibrous crystalline cellulosic slurry is dried.
  • the cells 700 are sized to print dots of the fibrous crystalline cellulosic slurry to form a substantially continuous band of fibrous crystalline cellulosic material 126 on the base web 140 when the fibrous crystalline cellulosic slurry is dried.
  • the cells 700 are sized to print small enough dots of the fibrous crystalline cellulosic slurry to form a non-continuous band of fibrous crystalline cellulosic material 126 on the base web 140 when the fibrous crystalline cellulosic slurry is dried wherein one or more areas within the non-continuous band of fibrous crystalline cellulosic material 126 are free of added fibrous crystalline cellulosic material. Adjustment of diffusivity of the banded regions of fibrous crystalline cellulosic material 126 can be facilitated by changing the size and/or number of cells 700 which apply fibrous crystalline cellulosic slurry.
  • a gravure roller 610 is supplied fibrous crystalline cellulosic slurry, and moves through a doctor blade 630 that extends along the length of the gravure roller 610.
  • the doctor blade 630 is positioned so that is wipes the surface of the gravure roller 610 such that portions 703 of the gravure roller 610 that define the nominal spacing between adjacent banded regions 126 are essentially wiped clean of the fibrous crystalline cellulosic slurry, while the cells 700 of the gravure roller 610 advance toward a nip 616 of the printing station 602 full of the fibrous crystalline cellulosic slurry.
  • the gravure roller 610 contacts one side of the base web 140 in the nip 616 between the gravure roller 610 and an impression cylinder 612 backed by backing roller 614 to print the fibrous crystalline cellulosic slurry in the cells of the gravure roller 610 on the base web 140.
  • the fibrous crystalline cellulosic slurry is delivered from a reservoir 618 to an applicator 624 by a suitable pump 620.
  • the fibrous crystalline cellulosic slurry is spread on the gravure roller 610 by the applicator 624.
  • Excess fibrous crystalline cellulosic slurry accumulates in a bath 626 held by collector 627 from which excess fibrous crystalline cellulosic slurry returns via drain 628 to the reservoir 618.
  • the fibrous crystalline cellulosic slurry is continuously circulated between the reservoir 618 and the bath 626 to prevent the solids in the fibrous crystalline cellulosic slurry from settling in the bottom of the reservoir 618 or the bottom of the bath 626.
  • the fibrous crystalline cellulosic slurry in the reservoir 618 is continuously agitated or mixed, to prevent solids in the fibrous crystalline cellulosic slurry from settling in the bottom of the reservoir 618.
  • the fibrous crystalline cellulosic slurry printed on the base web 140 at room temperature.
  • the fibrous crystalline cellulosic slurry can be prepared by mixing fibrous crystalline cellulosic material and chalk with a sufficient amount of water to make an aqueous slurry having a composition of less than about 10% solids.
  • the fibrous crystalline cellulosic material is insoluble in the water such that mixing the fibrous crystalline cellulosic material and chalk with the water suspends the fibrous crystalline cellulosic material and the chalk in the water to form a stable slurry.
  • the fibrous crystalline cellulosic material is free of any modified cellulose.
  • the fibrous crystalline cellulosic material is free of any binders.
  • the fibrous crystalline cellulosic material is free of any binders and modified cellulose. In an example embodiment, the fibrous crystalline cellulosic material is free of any bacterial cellulose. In an example embodiment, the fibrous crystalline cellulosic material is microcrystalline cellulose and is free of any binders and modified cellulose. In an example embodiment, the fibrous crystalline cellulosic material is microcrystalline cellulose and a binder.
  • the fibrous crystalline cellulosic material includes microcrystalline cellulose and a binder, and is free of any modified cellulose.
  • the fibrous crystalline cellulosic material is free of starch, guar gum, alginate, and/or cellulose derivatives.
  • the fibrous crystalline cellulosic material is free of any film forming material.
  • the fibrous crystalline cellulosic material includes a binder such as sodium carboxymethyl cellulose or carboxymethyl cellulose.
  • the fibrous crystalline cellulosic material includes microcrystalline cellulose and a binder wherein the binder is less than about 9% by weight of the fibrous crystalline cellulosic material.
  • the fibrous crystalline cellulosic material includes AVICEL TM microcrystalline cellulose.
  • the fibrous crystalline cellulosic material includes microcrystalline cellulose and a binder, and is free of any modified cellulose.
  • the fibrous crystalline cellulosic material includes microcrystalline cellulose wherein the fibers of the microcrystalline cellulose are predominately of a size of about 200 microns or less.
  • the fibrous crystalline cellulosic material includes microcrystalline cellulose wherein at least 90% of the fibers of the microcrystalline cellulose have a size of about 200 microns or less.
  • the fibrous crystalline cellulosic material includes microcrystalline cellulose wherein the fibers of the microcrystalline cellulose are predominately of a size of about 10 microns or more.
  • the fibrous crystalline cellulosic material is insoluble in room temperature water wherein the fibrous crystalline cellulosic material is mixed with room temperature water.
  • the fibrous crystalline cellulosic material is insoluble in water having a temperature less than about 38° C wherein the fibrous crystalline cellulosic material is mixed with water having a temperature less than about 38° C.
  • the fibrous crystalline cellulosic material and chalk is mixed with non-deionized water such as tap water.
  • the fibrous crystalline cellulosic slurry is a composition having less than about 9.5% fibrous crystalline cellulosic material and less than about 5.5% chalk.
  • the fibrous crystalline cellulosic slurry is a composition having about 9.5% fibrous crystalline cellulosic material and about 5.5% chalk.
  • the fibrous crystalline cellulosic slurry includes up to 9.5 weight % cellulosic fibrous crystalline material and up to 5.5 weight % chalk.
  • a room temperature viscosity of the fibrous crystalline cellulosic slurry is no greater than about 40 centipoises.
  • a room temperature viscosity of the fibrous crystalline cellulosic slurry is between about 30 to 40 centipoises.
  • a room temperature viscosity of the fibrous crystalline cellulosic slurry is less than about 30 to 40 centipoises.
  • the fibrous crystalline cellulosic slurry is a composition having less than about 10% solids wherein a ratio fibrous crystalline cellulosic material to chalk in the fibrous crystalline cellulosic slurry is about 95 to 5. In an example embodiment, the fibrous crystalline cellulosic slurry is a composition having less than about 8% solids wherein a ratio fibrous crystalline cellulosic material to chalk in the fibrous crystalline cellulosic slurry is about 95 to 5.
  • the fibrous crystalline cellulosic slurry is a composition having less than about 6% solids wherein a ratio fibrous crystalline cellulosic material to chalk in the fibrous crystalline cellulosic slurry is about 95 to 5. In an embodiment, the fibrous crystalline cellulosic slurry is a composition having less than about 5% solids wherein a ratio fibrous crystalline cellulosic material to chalk in the fibrous crystalline cellulosic slurry is about 95 to 5.
  • the fibrous crystalline cellulosic slurry is a composition having about 2% solids wherein a ratio fibrous crystalline cellulosic material to chalk in the fibrous crystalline cellulosic slurry is about 95 to 5. In an embodiment, the fibrous crystalline cellulosic slurry is a composition having less than about 10% solids wherein a ratio fibrous crystalline cellulosic material to chalk in the fibrous crystalline cellulosic slurry is about 94.5 to 5.5.
  • the fibrous crystalline cellulosic slurry is a composition having less than about 8% solids wherein a ratio fibrous crystalline cellulosic material to chalk in the fibrous crystalline cellulosic slurry is about 94.5 to 5.5. In an embodiment, the fibrous crystalline cellulosic slurry is a composition having less than about 6% solids wherein a ratio fibrous crystalline cellulosic material to chalk in the fibrous crystalline cellulosic slurry is about 94.5 to 5.5.
  • the fibrous crystalline cellulosic slurry is a composition having less than about 5% solids wherein a ratio fibrous crystalline cellulosic material to chalk in the fibrous crystalline cellulosic slurry is about 94.5 to 5.5. In an embodiment, the fibrous crystalline cellulosic slurry is a composition having about 2% solids wherein a ratio fibrous crystalline cellulosic material to chalk in the fibrous crystalline cellulosic slurry is about 94.5 to 5.5.
  • the final fibrous crystalline cellulosic slurry can be printed as longitudinally spaced apart banded regions, as described with respect to FIG. 2 , to a base web 140 used to form banded wrapper paper 123 for smoking articles wherein the base web 140 has a nominal width ranging from about 36 inches (i.e., about 920 mm) to about 60 inches at the gravure printing press.
  • the moisture content of the base web 140 at the time of gravure printing is at least 3%.
  • the base web 140 is passed through a sprayer operable to spray water on the base web 140 before gravure printing to increase the moisture level of the base web 140 to at least 3%.
  • the fibrous crystalline cellulosic slurry can be applied to the base web 140 at a target rate of about 5 to 50 BCM (billion cubic microns per square inch). In an embodiment, the fibrous crystalline cellulosic slurry can be applied to the base web 140 at a target rate of about 5 BCM to about 38 BCM. Thereafter the base web 140 can be dried so that the printing solution dries. In an example embodiment, the fibrous crystalline cellulosic slurry is gravure printed on the base web 140 in a single pass to form bands of fibrous crystalline cellulosic material 126 wherein the total dry weight of the added fibrous crystalline cellulosic material of each band is up to about 2.5 gsm.
  • the fibrous crystalline cellulosic slurry is gravure printed on the base web 140 in a single pass to form bands of fibrous crystalline cellulosic material 126 wherein the total dry weight of the added fibrous crystalline cellulosic material of each band is about 2.5 gsm.
  • the fibrous crystalline cellulosic slurry is gravure printed on the base web 140 in multiple passes to form bands having multiple layers of fibrous crystalline cellulosic material 126 wherein the total dry weight of the added fibrous crystalline cellulosic material is up to about 2.5 gsm.
  • the fibrous crystalline cellulosic slurry is gravure printed on the base web 140 in multiple passes to form bands having multiple layers of fibrous crystalline cellulosic material 126 wherein the total dry weight of the added fibrous crystalline cellulosic material is about 2.5 gsm.
  • the base web 140 may be passed through a drier 634, such as a heated can drier, to dry or partially dry the base web 140 between passes.
  • the base web 140 can be passed through the drier 634 and advanced under tension to a slitter 635 where the nominal width of the base web can be longitudinally cut into a plurality of strips or ribbons, each strip having a width of about 27 mm (e.g., the width required to surround a conventional tobacco rod and have a longitudinal glue seam). While the base web 140 is still under tension, the plurality of strips can be simultaneously wound onto individual bobbins.
  • Ignition Propensity or IP is a standard test conducted as set forth in ASTM E 2187-04, "Standard Test Method for Measuring the Ignition Strength of Smoking Articles", which is incorporated herein in its entirety by this reference thereto.
  • Ignition propensity measures the probability that a smoking article, when smoldering and placed on a substrate, will generate sufficient heat to maintain smoldering of the tobacco rod.
  • Low values for IP are desirable as such values correlate with a reduced likelihood that a smoldering smoking article, when inadvertently left unattended upon a substrate, will cause combustion in the substrate.
  • An IP value of a smoking article should be no greater than about 25%, and preferably no greater than about 20%, and even more preferably no greater than about 10% as described in US Patent Application Publication No. 2013/0306082 published Nov. 21, 2013 , the entire content of which is incorporated herein by reference thereto.
  • Self-Extinguishment or SE herein is a reference to smoldering characteristics of a smoking article under free burn conditions.
  • SE Self-Extinguishment
  • a laboratory test is conducted at a temperature of 23° C +- 0.3° C and relative humidity of 55% +- 0.5%, both of which should be monitored by a recording hygrothermograph. Exhaust hood(s) remove combustion products formed during testing.
  • smoking articles to be tested Prior to testing, smoking articles to be tested are conditioned at 55% +-0.5% relative humidity and 23° C +- 0.3° C for 24 hours. Just prior to testing, the smoking articles are placed in glass beakers to assure free air access.
  • SE testing takes place within an enclosure or test box.
  • a single port smoking machine or an electric lighter is used to ignite the smoking articles for the test.
  • an apparatus or "angle holder” holds the smoking articles to be tested by holding an end at angles of 0° (horizontal), 45°, and/or 90° (vertical).
  • 0° horizontal
  • 45° 45°
  • 90° 90°
  • twenty (20) smoking articles are tested at each of the 0°, 45°, and 90° positions.
  • the apparatuses are preferably positioned such that the smoking articles face away from each other to avoid cross interference.
  • an SE value of 95% indicates that 95% of the smoking articles tested exhibited self-extinguishment under free burn conditions; while an SE value of 20% indicates that only 20% of the smoking articles tested exhibited self-extinguishment under such free burn conditions.
  • the SE value for a smoking article should be no greater than about 80% (at horizontal orientation) and preferably no greater than about 50% and even more preferably no greater than about 25% as described in US Patent Application Publication No. 2013/0306082 published Nov. 21, 2013 , the entire content of which is incorporated herein by reference thereto. It is desirable to achieve IP performance that meets and exceeds governmental requirements. Moreover, as also previously noted, that desired IP performance often adversely impacts the SE performance of the smoking article. Stated differently, while the IP performance may meet or exceed the governmental requirements, that IP performance is typically associated with a smoking article that will self-extinguish when hand held by a smoker--an SE of 100%. Since smokers ordinarily prefer not to need to relight a smoking article, improvement of SE performance while maintaining IP performance constitutes a highly desirable feature for improved wrappers.
  • a band 126 configuration such as shown in FIG. 6 is capable of better sustaining smoldering during free burns, yet when placed adjacent a substrate, does not sustain smoldering.
  • about 10% IP can be obtained for paper having diffusion ranging from about 0 to about 0.2 cm/sec, while maintaining about 18% SE, by controlling the print area and volume of fibrous crystalline cellulosic slurry printed on the base web 140.
  • banded wrapper paper 123 can include a base web 140 which includes a plurality of bands of fibrous crystalline cellulosic material 126 on one or both sides thereof.
  • the bands of fibrous crystalline cellulosic material 126 can be arranged on the base web 140 such that a smoking article 120 (see e.g., FIG.
  • each band of fibrous crystalline cellulosic material has a first zone 202, a second zone 203, and optionally a third zone 204 of fibrous crystalline cellulosic material wherein the amount of the fibrous cellulosic crystalline cellulosic material within each zone can be selected to control the IP performance and/or SE performance of a smoking article including the wrapper paper.
  • the first zone 202 and the third zone 204 include about the same amount of fibrous crystalline cellulosic material on the base web 140, while the second zone 203 has about 20% to about 80% (e.g., about 25% to about 75%, about 30% to about 70%, about 35% to about 65%, about 40% to about 60%, or about 45% to about 55%) less fibrous crystalline cellulosic material on the base web 140 than the first or third zones 202, 204.
  • the fibrous crystalline cellulosic material of each zone is applied as a plurality of dots of fibrous crystalline cellulosic slurry arranged in a pattern, generally within the zone, to produce a banded region of fibrous crystalline cellulosic material on the base web 140.
  • each dot of fibrous crystalline cellulosic slurry printed in the second zone 203 has smaller dimensions than each dot of fibrous crystalline cellulosic slurry printed in the first zone 202 and the third zone 204.
  • FIG. 7 shows an example embodiment of a patterned portion of a gravure cylinder (roller) 610 that may be used to print banded regions of fibrous crystalline cellulosic slurry to form banded regions of fibrous crystalline cellulosic material 126 which have a first zone 202, a second zone 203, and a third zone 204 of fibrous crystalline cellulosic material.
  • the first, second, and third zones 202, 203, 204 of each banded region 126 are directly adjacent to one another such that they are not separated by a length of base web 140 that is free of added fibrous crystalline cellulosic material. As shown in FIG.
  • the gravure roller 610 includes a plurality of cells 700 etched thereon in a pattern corresponding to the aforementioned zones 202, 203, 204 wherein the cells 700 have a generally hexagonal shape.
  • the gravure cylinder 610 includes first and third zones 712 and a second zone 710 therebetween wherein walls 720 between adjacent cells 722 in the first and third zones 712 have a narrower width than walls 724 between adjacent cells 726 of the second zone 710.
  • dots of printed slurry in the first zone 202 and third zone 204 are formed by a gravure roller 610 including cells 722 having thinner walls 720 between adjacent cells 726, such that a greater amount of fibrous crystalline cellulosic slurry is applied and the dots of printed slurry tend to run together when printed on the base web 140.
  • the walls 724 of the cells 726 may be configured such that the dots of printed slurry run together when printed on the base web 140.
  • the walls 720 between adjacent cells 726 of the first and/or third zones 202, 204 may be configured such that the dots printed thereby tend to stay separated once printed on the base web 140.
  • the first zone 202 and the third zone 204 can have a diffusivity ranging from about 0 to about 0.1 cm/sec (e.g. about 0.01 to about 0.09 cm/sec, about 0.02 to about 0.08 cm/sec, about 0.03 to about 0.07 cm/sec or about 0.04 to about 0.06 cm/sec), and the second zone 203 can have a diffusivity ranging from about 0.1 to about 0.4 cm/sec (e.g. about 0.15 to about 0.35 cm/sec or about 0.2 to about 0.3 cm/sec).
  • embodiments of the invention comprise the following features:
EP22166022.8A 2019-03-01 2020-02-27 Papier d'emballage en bandes imprimé par héliogravure Pending EP4108106A1 (fr)

Applications Claiming Priority (2)

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US16/290,327 US20200275690A1 (en) 2019-03-01 2019-03-01 Gravure printed banded wrapper paper
EP20159740.8A EP3701810B1 (fr) 2019-03-01 2020-02-27 Papier d'emballage en bandes imprimé par héliogravure

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5263999A (en) * 1991-09-10 1993-11-23 Philip Morris Incorporated Smoking article wrapper for controlling burn rate and method for making same
US20060021625A1 (en) * 2004-07-30 2006-02-02 Philip Morris Usa Inc. Make-your-own smoking article with controlled burn rate
US20130306082A1 (en) 2012-05-16 2013-11-21 Altria Client Services Inc. Novel banded cigarette wrapper with opened-area bands

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6779530B2 (en) * 2002-01-23 2004-08-24 Schweitzer-Mauduit International, Inc. Smoking articles with reduced ignition proclivity characteristics

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5263999A (en) * 1991-09-10 1993-11-23 Philip Morris Incorporated Smoking article wrapper for controlling burn rate and method for making same
US20060021625A1 (en) * 2004-07-30 2006-02-02 Philip Morris Usa Inc. Make-your-own smoking article with controlled burn rate
US20130306082A1 (en) 2012-05-16 2013-11-21 Altria Client Services Inc. Novel banded cigarette wrapper with opened-area bands

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EP3701810B1 (fr) 2022-04-06
US20200275690A1 (en) 2020-09-03

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