KR20100024948A - Banded papers, smoking articles and methods - Google Patents

Abstract

A wrapper 123 for cigarette manufacture includes one or more transversely extending band regions 126 applied by a printing technique, such as gravure printing. The band regions comprise starch, an anti-wrinkling agent such as 1,2 propylene glycol or glycerin, and optionally calcium carbonate. Any suitable printing technique can be used to apply the aqueous solution to the banded regions. The pattern of banded regions may be bands, stripes, two-dimensional arrays, undulated regions, and the like along and/or around the tobacco rod. The pattern can be applied in one or more layers. The pattern may be configured so that when a smoking article is placed on a substrate, at least two longitudinal locations along the length of the tobacco rod have film-forming compound located only on sides of the smoking article not in contact with the substrate. The invention also encompasses a smoking article 120 including such a wrapper around a column of tobacco to form a tobacco rod 122. A method of providing a smoking article having an ignition propensity not greater than 25% is also disclosed.

Description

Striped paper, smoking articles and methods {BANDED PAPERS, SMOKING ARTICLES AND METHODS}

Cross-reference

The entire contents of each of the following applications are hereby incorporated by reference:

(i) PCT / IB2007 / 002118, filed Monday, April 2, 2007;

(ii) US Provisional Patent Application 60 / 929,452, filed June 28, 2007;

(iii) United States Provisional Patent Application 60 / 924,676, filed May 25, 2007;

(iv) US Provisional Patent Application 61 / 064,438, filed March 5, 2008;

(v) U.S. Provisional Patent Application 60 / 924,825, filed June 1, 2007;

(vi) United States Provisional Patent Application 60 / 935,751, filed August 29, 2007; And

(v) U.S. Provisional Patent Application 60 / 924,666, filed May 24, 2007.

The present invention generally relates to striped wrappers, related materials, processes and methods for use in the manufacture of smoking articles and more particularly cigarettes. Wrinkle inhibitors, specially formulated oxidized starch materials, smoking articles and wrapping papers exhibiting low ignition propensity and / or low self-extinguishing characteristics, and patterns for striped areas are described.

In an effort to reduce accidental fire occurrences by neglected smoking articles, various jurisdictions have been, have been, and will be granted to future regulations on the combustion characteristics of smoking articles. The ignition propensity value is a measure of the tendency of a smoking article to cause ignition of the underlying substrate. In order to meet the increased general government requirements, the ignition propensity value for smoking articles should preferably not be greater than about 25%. More preferably, the ignition propensity value should not be greater than about 20%; And more preferably, no greater than about 10%. Thus, efforts to meet this limitation are taken by various manufacturers of smoking articles.

Reduced ignition propensity values are typically associated with the self-extinguishing tendency of smoking articles during smoke generation between puffs. In general, consumers do not like to re-ignite cigarettes during smoking. It has been developed to measure the self-extinguishing tendency of smoking articles during free burns and is known as the self-extinguishing value. It has been found that self-extinguishing values are useful as a means of evaluating consumer satisfaction with smoking articles to which various techniques for reducing ignition propensity have been applied. The self-extinguishing average value for smoking articles should preferably not be greater than about 80% and / or the self-extinguishing value at 0 ° should not be greater than about 50%, and more preferably not greater than about 25%.

Ignition propensity

Ignition propensity is a standard test performed in accordance with ASTM E 2187-04, "Standard Test Methods for Smoking Product Ignition Strength Measurement," which is hereby incorporated by reference in its entirety. The propensity to ignite measures the probability of generating enough heat to maintain the smoke generation of the tobacco rod when the smoking article is smoked and placed on the substrate. The low value of the ignition tendency is desirable because it relates to the reduced likelihood of causing combustion in the substrate when the smoking smoking article is left unintentionally left.

Self-extinguishing

Self-extinguishing herein is the basis for the smoke generation characteristics of smoking articles under pre-burn conditions. To assess self-extinguishing, laboratory tests were performed at a temperature of 23 ° C. ± 3 ° C. and a relative humidity of 55% ± 5%, both of which should be monitored with a temperature and humidity recorder. The exhaust hood (s) are used to remove combustion products formed during the test. Prior to testing, the condition of the smoking article to be tested is taken at a relative humidity of 55% ± 5% and a temperature of 23 ° C ± 30 ° C for 24 hours. Immediately before testing, smoking articles are placed in glass beakers to ensure free air access.

SE testing is performed in an enclosure or test box. A single port smoking machine or electric lighter is used to ignite the smoking article for testing. During the test, the equipment or “angle holder” holds the ends of the smoking article to be tested at 0 ° (horizontal), 45 ° and / or 90 ° (vertical). Preferably, 20 smoking articles are tested at positions of 0 °, 45 ° and 90 °, respectively. When using more than one piece of equipment, the pieces of equipment are preferably laid out to face each other to prevent smoking articles from interfering with each other. If the smoking article is turned off before the forefront of the smoking coal reaches tipping paper, the result is evaluated as "self-extinguishing"; On the other hand, if the front line of coal smoked by a smoking article continues to smoke until it reaches tipping paper, the result is recorded as "non-digestible". Thus, for example, 95% self-extinguish means that 95% of the smoking articles tested are self-extinguishing under pre-burn conditions; On the other hand, 20% self-extinguishing means that only 20% of smoking articles show self-extinguishing under these pre-burn conditions.

The self-extinguishing value may be referred to in terms of "self-extinguishing value at 0 °", "self-extinguishing value at 45 °" or "self-extinguishing value at 90 °", each of which is magnetic at a specified test angle. Refers to the value of digestibility. In addition, the self-extinguishing value may be referred to in terms of "self-extinguishing average", which means (i) "self-extinguishing value at 0 °", (ii) "at 45 °". Self-extinguishing value ", and (iii)" self-extinguishing value at 90 ° ". The criterion for "self-extinguishing value" refers to any one of them without distinguishing between a self-extinguishing value at 0 °, a self-extinguishing value at 45 °, a self-extinguishing value at 90 ° or an average self-extinguishing value.

In the execution of a multi-pass print job, the operator will typically introduce pressure very early to print a registration mark. Thus, in understanding the description of "first pass", "second pass", "third pass", etc. of the present specification, such a pass will typically begin with a pass (or print station) for introducing a registration mark on paper, The mark is used to keep the desired markings from pass to pass (from print station to print-station).

summary

Embodiments described herein include striped articles and smoking articles composed of such papers, wherein the additional material comprises an aqueous solution of starch (or system) comprising an anti-wrinkle agent, as described herein, to achieve the following: :

Measures against the tendency of aqueous solutions to crease and mark on paper;

Measures to more accurately maintain the print-mark from the print-station to the print-station, especially in the transverse dimension of the paper, against the tendency of the aqueous solution to shrink the paper transversely during the printing operation;

This measure makes it possible to print complex patterns on the basic web with an aqueous addition system at a commercially viable printing speed;

The possibility of a single pass, gravure-printed striped paper with an aqueous solution when combined with sufficient drying capacity;

More precise multi-pass printing of striped paper with aqueous solution; And

Improved stability of the solution, reducing costs and waste during printing, and including longer work retention periods.

In addition, embodiments are provided that include striped paper and smoking articles composed of such paper, wherein the additional material is a choke of sufficient amount to mitigate the tendency of the striped paper to self-extinguish and enhance the appearance of the product to the consumer. Preferably comprising a starch aqueous solution. Further embodiments are presented that include features and conditions for maintaining the ability to machine vision inspect stripe paper during printing operations despite the presence of chalk components in additional materials.

Embodiments are also disclosed that include striped paper and smoking articles composed of such paper, wherein the stripes are constructed according to a pattern that helps mitigate the statistical occurrence of self-extinguishing while maintaining the desired ignition propensity performance.

According to one aspect of the present disclosure, the packaging paper for smoking articles may have a base web to which additional materials are applied in a pattern using a starch solution comprising an anti-wrinkle agent. The packaging paper may comprise an additional material zone comprising about 1.5 g / m ² starch and about 0.36 g / m ² to about 0.90 g / m ² 1,2-propylene glycol. If desired, the additional material may also include chalk or calcium carbonate from about 0.64 g / m ² to about 1.2 g / m ₂ .

According to another aspect of the invention, a smoking article may comprise tobacco and packaging paper, wherein the packaging paper comprises a pattern of additive materials applied as an aqueous solution of starch containing an anti-wrinkle agent.

Another aspect of the invention provides a method of making or manufacturing a patterned wrapping paper by feeding a starch aqueous solution incorporating an anti-wrinkle agent to a print station so that the pattern can be applied using the aqueous starch aqueous solution as the base web passes through it. It includes.

Additional aspects of the present specification include, but are not limited to, patterns for additional materials and features of the constituents of the additional materials. Additionally, the present disclosure relates to the resulting smoking article features, including but not limited to ignition propensity and self-extinguishing properties.

Those skilled in the art will understand many of the objects and advantages of this specification by reading the specification in conjunction with the accompanying drawings, wherein like reference numerals apply to the same elements.

1 is a schematic perspective view of a smoking article according to the present invention;

2 is a schematic view of a wrapping paper according to the present invention;

3 is an enlarged partial cross-sectional view taken along line 3-3 of FIG. 2;

4 is a mosaic micrograph of an actual wrapping paper having two layers of additional materials;

5 is a schematic view of a wrapper according to another embodiment of the present invention;

6 is an enlarged partial cross-sectional view taken along line 6-6 of FIG. 5;

7 is a schematic view of a wrapper according to a further embodiment of the invention;

8 is a schematic view of a wrapper according to another embodiment of the present invention;

9 is a schematic enlarged cross-sectional view taken along line 9-9 of FIG. 2;

10 is a schematic cross-sectional view, similar to FIG. 9, of a multilayer striped construct;

11 is a schematic view of a wrapper having longitudinally extending striped regions;

12 is a plan view of a wrapper having a spiral, vertical stripe section for making a tobacco rod;

13 is a perspective view of another embodiment of a smoking article according to the present invention;

14 is an enlarged cross-sectional view of a smoking article over a substrate showing air flow to the smoky coal;

FIG. 15 is an enlarged cross-sectional view of a smoking article removed from a substrate showing air flow to smoked coal;

16 is a perspective view of a smoking article according to another embodiment;

FIG. 17 is an enlarged flat view of the unpackaged portion of the wrapper used to construct the smoking article of FIG. 16; FIG.

18 is an enlarged cross-sectional view of a wrapper for a smoking article, showing another quadrilateral pattern;

19 is an enlarged cross-sectional view of a wrapper for a smoking article, showing a further quadrilateral pattern;

20 is an enlarged cross-sectional view of a wrapper for smoking article showing another further quadrilateral pattern;

21 is an enlarged cross-sectional view of a wrapper for smoking article showing a triangular pattern;

22 is a side view of a smoking article using the wrapper of FIG. 18 with the smoking article in the substrate and arranged such that a portion of the first side of the smoking article contacts the substrate;

FIG. 23 is a side view of a smoking article using the wrapper of FIG. 18 with the smoking article in the substrate and arranged so that a portion of the second side of the smoking article contacts the substrate; FIG.

24 is a side view of a smoking article using the wrapper of FIG. 18 with the smoking article in the substrate and arranged so that a portion of the third side of the smoking article contacts the substrate;

25 is a cross-sectional view of the smoking article taken along line 25-25 of FIG. 22;

FIG. 26 is a cross sectional view of the smoking article taken along line 26-26 of FIG. 22;

FIG. 27 is a cross sectional view of the smoking article taken along line 27-27 of FIG. 22;

28 is an embodiment with axially split striped regions;

FIG. 29 is a partial cross-sectional view taken along line 29-29 of FIG. 28;

30 is an embodiment with two axial slits in the striped region;

FIG. 31 is a partial cross-sectional view taken along line 31-31 of FIG. 30;

32 is an embodiment with axially split striped regions;

33 is a partial cross sectional view taken along line 33-33 of FIG. 32;

34 is a side view of another embodiment of a smoking article according to the present invention;

FIG. 35 is an enlarged partial sectional view taken along line 35-35 of FIG. 34;

36 is a side view of a further embodiment of a smoking article according to the present invention;

FIG. 37 is an enlarged partial cross-sectional view taken along line 37-37 of FIG. 36;

FIG. 38 is an enlarged partial cross-sectional view of an optional embodiment similar to FIG. 31;

39 is a perspective view of another embodiment of a smoking article in accordance with the present invention;

40 is a partial plan view of a wrapper of another embodiment;

41 is a perspective view of a further embodiment of a smoking article according to the present invention;

42 is a side view of another embodiment of a smoking article in accordance with the present invention;

43 is a side view of another embodiment of a smoking article in accordance with the present invention;

FIG. 44 shows an embodiment of a smoking article comprising a spiral longitudinal stripe region and a helix angle β of approximately arctangent (2 I / C), where I is the length of the tobacco rod and C is the circumference of the smoking article described herein. to be;

45 illustrates an embodiment of a smoking article that includes a spiral longitudinal stripe region as described herein and a spiral angle β of approximately arctangent (4I / C);

FIG. 46 illustrates an embodiment of a smoking article comprising a spiral longitudinal stripe region as described herein and a spiral angle β of approximately arctangent (I / C);

FIG. 47 is a top view of a wrapper for making a tobacco rod with vertical striped zones; FIG.

FIG. 48 illustrates an embodiment of a smoking article that includes a vertical striped region, parallel to the longitudinal axis of the smoking article as described herein;

49 is a perspective view of a smoking article in accordance with the present invention;

50 is a schematic view of a wrapper having a blindfold striped area;

51 is a schematic view of a wrapper having another embodiment of a broad eye stripe zone;

52 is a schematic view of a wrapper having another embodiment of a broad eyelid stripe area;

53 is a schematic view of a wrapper having another embodiment of a broad eyelid stripe area;

54 is a schematic view of a wrapper having another embodiment of a broad eyelid stripe area;

55 is a schematic view of a wrapper having another embodiment of a broad eyelid stripe area;

56 is a schematic view of a wrapper having another embodiment of a broad eyelid stripe area;

57 is a schematic view of a wrapper having another embodiment of a broad eyelid stripe area;

FIG. 58 is a cross sectional view of a smoking article including another embodiment of a vertical striped zone as described herein; FIG.

FIG. 59 is a schematic diagram of a gravure printing process suitable for producing an embodiment of the printed striped wrapper described herein;

60 are photographs showing the effect of the anti-wrinkle agent on the packaging paper.

With reference to FIG. 1, the present invention relates to a smoking article 120, such as a cigarette, preferably a tobacco rod 122 and a filter 132 attached to the tobacco rod 122 by tipping paper 132. It includes. Preferably, tobacco rod 122 comprises a column of piece tobacco ("cut filler") and a wrapper arranged near the tobacco column, which wrapper 123 is constructed according to the following description. The tobacco rod 122 has an ignition or ignition end 124 and a tip end 130 (in the case of a non-filter cigarette, referred to as the oral end of the cigarette 120). Cutting filler tobacco is an industry-standard designation. In addition, the tobacco rod 122 typically has a circular cross section, although other elliptical cross sections and other shapes also belong to the present invention. The wrapper is sealed along the longitudinal seam to form the tobacco rod 122.

The tobacco rod has a nominal length measured from the edge 131 of the tipping paper to the free end of the tobacco rod along the longitudinal axis of the smoking article. For example, the nominal length will fall in the range of about 60 mm to about 100 mm.

The “packaging” paper 123 (see FIG. 2) typically includes a “base web” 140, made of flax, wood pulp, cellulose fibers, and the like, and a number of striped areas 126 applied to one or both sides. ) Preferably, the stripe zone 126 is applied to the interior of the wrapper in the sense of how the wrapper 123 wraps the tobacco column in the tobacco rod 122.

In the manufacture of base webs suitable for building various embodiments of the printed striped paper described in the present invention, such preparations usually involve the production of rolls of base webs of several feet diameter (usually about 1 meter (three feeds) or transverse dimensions). Including, this is then split into bobbins. The printing operation is preferably carried out on a roll, but may be performed after slitting. Preferably, the bobbin itself may have a transverse dimension equal to the width required to manufacture the tobacco rod 122 or an integer multiple of this width (eg, one, two, or four times that width). have. Bobbins are suitable for use with conventional cigarette making machines. The wrapping is preferably dimensioned in the cross-sectional direction, taking into account the seam overlapping the nominal circumference of the tobacco rod. As a result, when the wrapper breaks up, the smoking article formed therefrom has longitudinal seams with accurate overlap.

In the present invention, "vertical" is the length of the base web 140 used along the length of the tobacco rod (eg, along the axis 134 of FIG. 1) or used in the manufacture of the wrapper used to make the tobacco rod. (For example, arrow 142 of FIG. 2).

In the present invention, "horizontal" refers to the direction in which the tobacco rod 122 is circumferentially enclosed (see FIG. 1) or the base web 140 used in the manufacture of the wrapping paper used to make the tobacco rod (eg, FIG. It refers to the horizontal direction of the arrow 144 of 2.

In the present invention, the "striped zone" or "zone" refers to the area 126 (see FIG. 2) where additional material is applied in the underlying base web 140. Striped regions typically represent a two dimensional pattern or arrangement above the base web 140. More specifically, the pattern or arrangement may be repeated units in the longitudinal direction of the base web 140, repeat units in the horizontal direction 144 of the base web 123, or width 144 and the length of the base web 140. Repeating units in both (142) directions. Zone 126 of additional material may be applied to the wrapper 123 to obtain satisfactory or improved ignition propensity and to obtain improved self-extinguishing properties.

The additional material zone 126 is spaced along the base web 140 such that at least one zone 126 of the additional material is located between the first and second ends of the tobacco rod 122 in the finished smoking article and More preferably, at least two additional material zones appear on the tobacco rod 122. The additional material zone 126 extends in the circumferential direction at one or more spaced locations along an axis 134 extending around the tobacco rod 122 of the smoking article. Although the additional material zone 126 is described herein as being substantially continuous in its circumferential direction, other configurations of the additional material are within the intent and scope of the present invention.

In describing the dimensions of various embodiments of the present invention, the stripe or zone “width” extends in the longitudinal direction 134 (see FIG. 1) of the tobacco rod 122, while the dimension in the circumferential direction is “circumferential” or “ Note that it will be displayed as "horizontal" or "crosswise".

When the stripe zone 126 extends horizontally (or around the tobacco rod circumference) of the base web 140, the “width” of the stripe zone 126 extends from the leading edge 146 to the trailing edge 148. Measured in the longitudinal direction 142, preferably from about 5 mm to about 9 mm (from the leading edge 146 to the trailing edge 148), more preferably from about 5.5 mm to about 7.5 mm and more preferred Is about 6 mm to 7 mm. Moreover, the stripe zone has a "phase" of about 27 mm (ie, the gap from the leading edge 146 of one stripe zone 126 to the leading edge 146 of the next adjacent stripe zone 126). . Preferably, the striped region of the additional material reduces the permeability of the wrapper to about 0 to about 12 CORESTA, more preferably about 0 to about 10 CORESTA.

In the present invention, the "stripe spacing" is defined between the trailing edge 148 of one striped region 126 and the trailing edge 148 of the adjacent striped region 126 above the base web 140 making the wrapping paper. Say the distance.

In the present specification, the “leading edge” refers to the edge 146 of the striped region 126 closest to the coal approaching during smoke generation in a smoking article that contains the striped region 126 in the wrapper 123 of the smoking article 126. (See FIG. 1), the “trailing edge” refers to the stripe zone 126 furthest from the coal approaching during smoke generation in the smoking article in which the stripe zone 126 is contained in the wrapping paper 123 of the smoking article 126. Refers to the edge 146. In a crenellated embodiment, the overall width "W" of the stripe zone is from the furthest forward limit of the leading edge to the furthest trailing limit of the trailing edge, as indicated by the width "W" in FIG. 5. Is measured.

As used herein, the term "total eye pattern" refers to a pattern of multiple, spaced, geometrically shaped spaces that differs from the remaining substantially continuous solid striped region 126. The bayonet pattern or stripes may also be described as indented or similar to pulse waves. As used herein, "crenels" refers to holes or valleys of the bleeding edge, and "merlons" refers to the plateau between the raised portions or strata of the bleeding edge. The term “waveform” includes broader geometric shapes and total bleeding edges that exhibit increasing and decreasing width characteristics.

As used herein, "layer" refers to a large amount of additional material applied to the base web from which the wrapper is to be made. Striped zone 126 may be made of one or more layers 150, 152 that may overlap one another (see FIG. 3). Each stripe zone 126 is formed by applying one or more "layers" 150, 152 of the aqueous film-forming composition to the base web 140 of the wrapper so that the permeability of the paper in the corresponding stripe zone is reduced. Can be. Optionally, cellulosic material may also be used to form the striped region.

When a film-forming composition is used, the "film-forming composition" may preferably comprise water and a high concentration of, for example, 14 wt% to about 50 wt% occluding agent. The film-forming composition may comprise one or more blocking agents such as starch, alginate, cellulose or gums and may also comprise calcium carbonate as filler. Moreover, the film-forming composition preferably comprises an anti-wrinkle agent. If the starch is a film-forming compound, a concentration of about 14% to about 26% is particularly advantageous and a concentration of about 16% is most preferred.

"Anti-wrinkle" is a material that suppresses the horizontal folds of the base web 140 (see FIG. 2) during printing or other switching operations. Suitable anti-wrinkle agents can be selected from the group consisting of 1,2 propylene glycol, propylene glycol, glycerin and starch plasticizers.

The film forming composition may be applied to the base web of the wrapper 140 using conversion techniques such as gravure printing, digital printing, coating or spraying with a mold, or other suitable technique. If desired, the stripe zone 126 of additive material may be formed by printing a plurality of continuous layers, for example two or more continuous layers aligned or aligned with each other.

 Once the tolerances of the gravure printing equipment are established, for example, adjacent layers are considered to fit within about 0.4 mm of each other when their respective overlapping edges are measured in either the longitudinal or transverse direction of the base web 140. Moreover, when the layers are used to form the striped region of the additional material, the materials of the adjacent layers may be the same or different. For example, one layer may be starch and the next layer may be starch and calcium carbonate.

When discussing the rate of application of additional material applied using gravure printing, often use a value with "X" as a factor to refer to the rate of dose application. The table below lists the volume equivalents for "X" in terms of 100 million cubic microns or "BCM".

When using the "weight ratio" for the starch component in the starch solution herein, the "weight ratio" is the weight ratio of the additional material to the weight of the starch used to prepare the starch solution. Furthermore, in this specification, "X% starch solution" refers to an aqueous solution of starch in which the starch weight is X% of the solution weight (ie, starch weight divided by the sum of the starch weight and the weight of the aqueous component).

The wrapper includes a base web that is typically air permeable. The permeability of the wrapper is typically confirmed in CORESTA units. The CORESTA unit is the term of the capacity flow rate (ie, cm ³ / sec) per unit area (ie, cm ² ) per unit pressure drop (ie, cm of water). The base web of conventional packaging also has a known basis weight, measured in grams per square meter (g / m ² ). The permeability and basis weight of the base web of smoking article paper commonly used in industry are as follows:

For this description, the preferred web of preferred wrapping paper has a permeability of at least about 20 CORESTA units. More preferably, the wrapper has a permeability greater than about 30 CORESTA, such as the normal permeability of a typical base web is from about 33 to about 46 CORESTA at a basis weight of about 25 g / m ² . In some applications, the base web has a transmission of greater than about 60 CORESTA, or greater than about 80 CORESTA or greater.

Summary vs Practical Description

It is believed that the description of the cross section adopted in the striped paper as in FIG. 3 is useful for the schematic depiction of a paper web having stripe zones produced by one or more layered applications and applications that produce such striped paper. However, this schematic depiction does not accurately depict the reality of the cross-section of the base web structure, or of the cross section of the base web structure to which one or more layers of additional material have been applied, or of the cross section of these additional materials in the final striped paper product.

More precisely, FIG. 4 is a mosaic of micrographs employing cross sections of striped wrappers of the type discussed above and elsewhere herein. The micrograph of FIG. 4 corresponds to the actual length of the wrapping paper measured about 2.1 mm in length, in which additional material is applied in two layers; One layer contains starch and calcium carbonate, and one layer contains starch but no calcium carbonate. A match line is applied to the other sheets of the mosaic of FIG. 4 so that the relationship between the different parts of FIG. 4 is readily apparent.

Individual micrographs of FIG. 4 magnify the actual paper sample by 2500 times. Procedurally, the actual striped paper was cut into several millimeter sections and embedded with Spurr ™ epoxy. The embedded paper was cut into 5 μm (micrometer) thick sections using a Leica Ultracut UCT Ultramicrotome equipped with a glass knife. The sample was mounted on a carbon sticky disc attached to an aluminum stub and sputter coated at 15 nm (nanometer) using a Cressington 208HR Sputter Coater operating in argon. Samples were imaged in adjacent overlaps using a FEI XL30 environmental scanning electron microscope (ESEM) operating at 15 kV in Hi-Vac mode.

4A and 4B depict a portion of the base web 140 without additional material. Base web 140 includes a plurality of randomly distributed light zones (eg, 160) representing calcium carbonate particles incorporated into the base web during papermaking. The base web 140 also includes a number of dark areas 162, some of which elongate, the others being circular, which are cuts through the fibers used in the papermaking process. The base web 140 has a pair of surfaces 161 and 163 which are characterized by having both calcium carbonate particles and fibers that are optionally rough at this level of magnification and are optionally distributed along the surface area. The thickness of the base web 140 itself is best characterized by any value, but to some extent has a statistical mean or nominal value.

When a first portion or layer of additional material 164 is applied (see FIG. 4C), additional material is displayed on the surface of base web 140 primarily due to the presence of choke (or calcium carbonate) in the material. In the enlarged sample of FIG. 4, a second portion or layer of additional material (see FIG. 4C) is applied over the surface of the base web 140 and positioned over the first layer 164. The second layer begins at approximately location 168. While the second layer does not appear to be arranged to start at the same position as the first layer, tolerances included in application techniques such as printing do not effectively allow the layers to be adjusted to a tolerance range of less than about 0.3 mm.

From the magnification shown on the figure of FIG. 4 mosaic, the distance between the beginning of the first layer and the beginning of the second layer is about 0.12 mm; The distance is within the minimum tolerance. By examining whether the first layer extends across FIGS. 4C-4G, it can be observed several times for the first layer 164 containing starch and calcium carbonate:

(i) layer 164 is not continuous in the direction of base web 140;

(ii) layer 164 is not uniform in thickness;

(iii) the thickness of layer 164 is non-uniform;

(iv) the thickness of layer 164 is not smooth; And

(v) Although the second layer is typically thicker than the first layer, the actual thickness of the first layer 164 may be thicker than the actual thickness of the second layer 168.

Similar investigations of the second layer 166, without starch, with the layers extending across FIGS. 4C-4G, allow some similar observations:

(i) the second layer 166 is not continuous in the direction of the base web 140;

(ii) the thickness of the second layer 166 is not uniform;

(iii) the thickness of the second layer 166 is non-uniform;

(iv) the second layer 166 tends to have a smooth surface, while the base web (paper) is free of the additional material that makes up the second layer 166, for example 170 (FIG. 4D), 172, 174 (FIG. 4E), and 176 (FIG. 4F).

The difference, as discussed above, demonstrates that the schematic depiction of a paper having one or more layers of additional material differs significantly from the results of the application of one or more layers of additional material to the base web 140. Thus, the schematic representation of the additive material significantly represents the process application rate to the extent that it can serve as a guide for etching the application zone, such as a gravure printing cylinder, while this schematic representation applies one or more layers of additive material to the base web. Accurately represent the structure of manufactured finished wrappers.

Illustrative Embodiment - Solid  Stripes pattern

A preferred embodiment of the multilayer application of the additive material by multi-application of the additive material and for constructing a solid stripe array having a stripe width in the range of about 6 to 7 mm is referred to with reference to FIG. 10. Striped first layer 210 may be applied at a rate of 4X and may include an aqueous solution containing approximately 16% starch, 60% chalk or calcium carbonate, and 60% 1,2-propylene glycol. The second layer 212 can be applied at a similar rate of 3.5X and can include the same solution as the first layer. The third layer may be applied at a lower rate of 3 × and may comprise an aqueous solution containing 16% starch and 60% 1,2-propylene glycol. In this formulation, the starch and propylene glycol 60% value means that the weight of these components contains 60% of the weight of the starch in the aqueous solution. After the various layers have been dried, the resulting base web has an additional material zone where starch is present at about 1.5 g / m ² , 1,2 propylene glycol is present in the range of about 0.36 to about 0.90 g / m ² and And calcium carbonate are present in the range of about 0.64 to about 1.2 g / m ² .

By containing propylene glycol in the described embodiments, the relevant advantages summarized above and described in more detail below can be achieved.

The inclusion of a choke in this embodiment, as described, mitigates the self-extinguishing tendency of striped paper cigarettes, improves the appearance of the product to the consumer, and other related benefits summarized above and described in greater detail by the following description. Are achieved.

On the other hand, by the application of the third layer 214 using the composition with little or no chalk component, the stripes during the printing operation, despite the presence of the choke component in the additional materials of the first and second layers 210 and 212 Machine vision inspection of paper can be performed. This property contributes to this advantage and other related advantages summarized above and described in greater detail below.

It will be appreciated that the solid striped construct as described with reference to FIG. 10 results in a wrapper that, in various applications, may contribute to the desired ignition tendency performance, including zero or nearly zero ignition tendency performance.

Difficulties faced by applying aqueous, preferably starch adduct solution

The idea of using starch aqueous solution as an additional material for producing striped wrappers is advantageous for controlling the ignition propensity characteristics of smoking articles made using such striped wrappers. However, application of aqueous starch solution to the base web presents a problem. For example, aqueous starch solution tends to pass through the irregular, rough, and porous surface of the base web 140, and tends to cause transverse wrinkles of the base web in the neighborhood of the striped region. For the last feature, when applying starch aqueous solution to a base web of about 92 cm (36 inches) in width, the base web is corrugated from about 1.3 cm (0.50 inch) to 1.9 cm (0.75 inch) or larger after drying. Wrinkles This amount of wrinkles prevents proper marking through printing and other switching operations.

Since the pleats are confined to the stripe zones, the width of the base web in the space between adjacent stripe zones is greater than the width of the base web in the stripe zone. Imbalances in the transverse widths can cause transverse waveforms in the base web in the spaces between the stripe regions.

Waveforms in such wrappers adversely affect both the subsequent manipulation of the wrapper and the manufacture of smoking articles with the wrapper. For example, when wrapping a corrugated wrapping paper with a bobbin, or winding it into bobbins, the winding operation flattens the corrugation, leaving marks on the wrapping paper. If flared wrappers are used in the manufacture of smoking articles, the marks on these wrappers make the smoking article a visually unacceptable smoking article.

Anti-wrinkle agent

Surprisingly, the present inventors have reduced the horizontal wrinkles to an operable level by incorporating an anti-wrinkle agent (preferably propylene glycol) in an aqueous solution of starch used in the manufacture of striped wrappers in a manner consistent with that described herein. We have found that we can mitigate and essentially eliminate the occurrence of problems that exist first in ourselves. It has also been found that the inclusion of anti-wrinkle agents has further advantages. For example, when the anti-wrinkle agent is bound to an aqueous solution of starch, the anti-wrinkle agent acts as a plasticizer so that the starch is more elastic during the drying process and in the finished paper. Cracking or flaking in the striped area was alleviated. In addition, the presence of the anti-wrinkle agent appears to allow the starch solution to penetrate less into the material and remain further on the surface of the base web, thus enhancing film formation. It was observed that the wrinkles of the wrapping paper near the stripe area made with an aqueous solution of starch containing an anti-wrinkle agent ranged from about 1.6 mm to 3.2 mm (0.0625 inch to 0.125 inch) for a wide basic web of 92 cm (36 inch); This range does not result in crumpled or excessive waveforms. Furthermore, it has been found that the inclusion of the anti-wrinkle agent in aqueous starch solution allows additional materials to be applied to the base web in a single application, printing pass, etc., as long as sufficient drying capacity is established in this practice. Moreover, since the print registration can be maintained more precisely from the print station to the print station, the inclusion of the anti-wrinkle agent in the aqueous starch solution to be applied in the pattern can express more complex than the solid streaks zone.

These advantages will be better understood by those skilled in the art by the following description. Referring to FIG. 2, zone 126 of additional material determines and modulates the ignition propensity and self extinguishing characteristics of a smoking article. These zones of additional material 126 are applied to the base web 140 (see FIG. 2) of the wrapper 123 and then formed into tobacco rods in conventional cigarette manufacturing equipment. Normal permeability of the base web 140 is from about 25 to about 100 CORESTA. Currently, preferred normal permeability of the base web is in the range of about 33 to about 65 CORESTA, and more preferred normal permeability is about 33 to about 60. The base web 140 has a longitudinal direction 142 that extends along the length of the wrapper 123 and a transverse direction 144 that extends across the wrapper, generally perpendicular to or transverse to the longitudinal direction 142.

These zones 126 of additional material may be applied to the base web 140, preferably by typography. One or more typography (selected from the group consisting of direct printing, offset printing, inkjet printing, gravure printing, etc.) may be used to apply the zone 126, preferably a gravure printing process will be used. Gravure printing provides extensive control over mounting speed, mounting pattern, and the like, and is suitable for high speed printing on the base web 140. As used herein, “high speed” printing refers to a printing process in which the base web advances through a printing process at a linear speed of greater than about 300 feet per minute (1.5 m / s). For cigarette production, the preferred web printing speed is preferably greater than 2.3 m / s (450 feet / min), more preferably greater than 2.5 m / s (500 feet / min). In this regard, when the wrapping paper made by the high speed printing process is compared with the wrapping paper made by the low speed printing process, the mounting speed for the additional material may vary considerably with the quality of the pattern of the mounted additional material. Fast-printing operations can achieve both more desirable ignition propensity values (performance) and desired self extinguishing values (performance).

Notably, the base web has an acceptable paper appearance (i.e. without quality bonding) at 5 m / s (1000 feet / min) and stretches or creases, depending on the embodiment described with reference to FIG. Or it can be converted (printed) to include streaks, without a statistically unacceptable occurrence.

One object of the present specification is to provide a wrapping paper 123 produced at high speed on a commercial scale with an ignition propensity value of 25% or less and a self extinguishing value of 50% or less, when formed from tobacco rods (see FIG. 2). ). Thus, the mounting speed and characteristics of the resulting print zone are important features of high speed printing. While these ignition propensity and self extinguishing values are currently considered sufficient, more preferably the ignition propensity values of the resulting smoking articles are about 15% or less; More preferred ignition propensity values of the resulting smoking articles are about 10% or less. Lower self-extinguishing values are also desirable. In this regard, more preferred self-extinguishing values are less than about 25%; While the most preferred self-extinguishing value is less than about 10%.

Materials used in the zone of additional materials may be important for the ignition propensity and self-extinguishing performance of smoking articles made using the wrappers discussed herein. In one embodiment, the zone of additional material may be printed with a starch solution comprising an anti-wrinkle agent. Currently, aqueous solutions of starch are preferred because the aqueous components are easily dried, while the use of non-aqueous starch solutions also falls within the intent and scope of the present invention. In another embodiment, the zone of additional material may be printed with a solution comprising a mixture of calcium carbonate (or chalk) particles, starch and an anti-wrinkle agent. As starch and anti-wrinkle solutions, solutions comprising a mixture of calcium carbonate (or chalk) particles, starch and anti-wrinkle agents are preferably applied as aqueous solutions, but non-aqueous solutions also fall within the intent and scope of this specification.

This specification intends that various anti-wrinkle agents are suitable for obtaining the desired properties described herein. In particular, the anti-wrinkle agent is selected from the group consisting of glycerin, propylene glycol, and 1,2-propylene glycol. Glycerin is a preferred member of antiwrinkle agents. At present, however, 1,2-propylene glycol is the most preferred member of the antiwrinkle agent.

In general, the present specification is intended that (i) the anti-wrinkle agent or (ii) the combination of the anti-wrinkle agent and calcium carbonate can be added to the nominal starch aqueous solution to obtain an additional solution to be used for printing. For nominal starch aqueous solution as used herein, starch comprises from about 10% to about 28% by weight of the nominal solution. Preferably, the starch may comprise about 14% to about 26% by weight of the nominal solution. Most preferably, starch will comprise about 16% by weight of the nominal solution.

The anti-wrinkle agent is preferably added to the nominal starch solution in a range of about 10% to about 120% by weight of the starch in the nominal starch solution.

When the anti-wrinkle agent is 1,2 propylene glycol, it is more preferred that the weight percentage of the anti-wrinkle agent ranges from about 40% to about 120% of the starch weight in the nominally starch solution; More preferably in the range of about 40% to about 80%; And most preferably from about 55% to about 65%. When the anti-wrinkle agent is glycerin, the weight of the anti-wrinkle agent is from about 10% to about 45% of the starch weight in the nominally starch solution; More preferably about 20% to about 40%; Most preferably about 20% to about 30%. When glycerin is used in the range of about 40 to about 45% as an anti-wrinkle agent, glycerin appears to adversely affect the dry quality of the addition solution.

Example

The illustrative, non-limiting examples below are intended to provide further explanation. The results provided in Tables I and II compare the initial viscosity and time stability in the print solution without the anti-wrinkle additive and the initial viscosity and time stability in the print solution with the anti-wrinkle additive. The information recorded for Table I (1,2-propylene glycol) and Table II (glycerine) indicated that printing solutions containing anti-wrinkle agents such as 1,2-propylene glycol or glycerin were initially less viscous and for much longer periods of time. It has a low viscosity, indicating that it is more stable.

Table I

¹ CaCO ₃ was added to a solution of 24% dry starch in water; The weight ratio of added CaCO ₃ to starch present in the solution is 0.8: 1.0.

² CaCO ₃ was added to a solution of 24% dry starch in water; The weight ratio of 1,2 1,2 propylene glycol added to added CaCO ₃ to starch present in the solution is 1.0: 0.8: 1.0.

Table II

¹ CaCO ₃ was added to a solution of 20% dry starch in water; The weight ratio of added CaCO ₃ to starch present in the solution is 1: 1.

² CaCO ₃ and glycerin were added to a solution of 20% dry starch in water; The weight ratio of added glycerin to added CaCO ₃ to starch present in the solution is 1: 5: 1.

The tables measure the viscosity of the printing solution with the anti-wrinkle agent, indicating that their useful shelf life is essentially twice the retention of the printing solution without the anti-wrinkle agent. Therefore, the addition of the anti-wrinkle agent in the material applied to the additional zone improves the flowability of the printing solution used to form the zone of the additional material.

When the additional material is applied by typography, the viscosity of the applied material is important. Since the viscosity of the applied material increases with time, the addition-material has a limited shelf life or pot life, after which the material loses its usefulness. As shown in Table I, by adding an anti-wrinkle agent to the applied material formulation, the initial viscosity of the additional material can be reduced by about 20%. Moreover, the shelf life or pot life of the additional material is increased at least twice as compared to the material without the anti-wrinkle agent.

The results provided in Tables III and IV show that adding anti-wrinkle agents to the printing solution reduces pre-burn self-extinguishing without adversely affecting the ignition tendency performance (ie, maintaining acceptable ignition propensity levels). In the information shown in Table III, 40 cigarette batches were tested to obtain ignition tendency performance and 20 batches of cigarettes were tested to obtain self extinguishing performance at each angular position.

TABLE III

¹ 1,2 propylene glycol was added to a solution of 22% dry starch in water; 1,2 propylene glycol was added to the starch solution at a ratio of 1,2 propylene glycol to dry starch of 1.0: 1.0; CaCO ₃ is indicated and added to the starch solution in weight percent measured relative to the dry starch used in the solution.

From Table III, certain combinations can be derived. For example, the ignition performance is well maintained at 25% of the target value for 7mm stripes. In addition, the propensity to ignite is well maintained at 25% of the target value if CaCO ₃ weight is less than 80% of starch weight. Moreover, the average self digestibility value is 70% or less if the CaCO ₃ weight is greater than 40% of the starch weight; And self-extinguishing at 0 ° was less than 25 when CaCO ₃ weight is greater than 40% of the starch weight.

As shown in Table IV, smaller groups of cigarettes, mainly five groups, were tested. Cigarettes tested for results in Table IV were prepared in two hand-brushed bands using additive material solutions as indicated in Table IV.

Table IV

Solution Ignition Propensity Self-extinguishing (0 ℃)

0 out of 5 20% starch solution 3 out of 5

20% starch solution + glycerin ¹ 0 out of 5 1 out of 5

(Ratio of glycerin to dry starch = 1: 1)

¹ glycerine was added to a solution of 20% dry starch in water; The weight ratio of added glycerin to dry starch present in solution is 1: 5.

In both solutions containing anti-wrinkle agents, all cigarettes were self-extinguishing before coal reached the filter line in the ignition propensity test. However, in the solution of anti-wrinkle agent (at 0 °) in the self-extinguishing test, 60% of cigarettes self-extinguish before the filter line, whereas for solutions containing anti-wrinkle agent, only 20% of cigarettes were filter line Before it was self digested. Therefore, self-extinguishing is maintained at or below 25% of the usual target. Ignition propensity performance was excellent and the resulting 0% is often significantly lower than the target 10%, 15% or 25% used. Therefore, the addition or inclusion of the antiwrinkle agent in the zone of the additional material reduces the pre-burn self extinguishing without adversely affecting the ignition propensity performance.

Incorporation of the antiwrinkle agent in the additional material also improves the properties of the resulting striped wrapper. More particularly, it has been found that when the anti-wrinkle agent is dried on the wrapper, it increases the flexibility of the additional material (ie acts as a plasticizer). As a result, the streaks of the additive material are less prone to separate from the base web when handled and used than the streaks of wrappers for which no anti-wrinkle agent is used in the formulation. Moreover, as described above, the incorporation of the anti-wrinkle agent into the additive material results in an improvement in self-extinguishing performance in smoking articles made of wrapping paper having streaks of the additional material comprising the anti-wrinkle agent, without degrading the ignition propensity performance.

Although the action of ignition inhibitors in starch solutions is not fully understood, anti-wrinkle agents appear to act as plasticizers in starch solutions. Starch solutions that do not have an anti-wrinkle agent that can also act as a plasticizer tend to penetrate the upper surface of the paper structure. Moreover, without reagents, starch solutions tend to shrink or crumble when it is dried. Shrinkage and / or crushing cause the web to shrink or crumble in areas that lie underneath, ie, beneath the striped region. For example, the information may be about 1.3 cm to 1.9 cm (0.5 inch to about 0.75 inch) in the stripe area of a wide paper web 92 inches wide (36 inches); That is, about 1% to about 2% shrinkage. Such shrinkage can cause difficulties, especially in the maintenance of desired registration among multiple print stations, especially when using multipass printing.

Since the underlying web between the stripe zones is not contracted, the zone between the stripe zones exhibits a waveform, the waveform extends in the longitudinal direction of the underlying web and the bend of the wave occurs in the cross-web or transverse direction of the underlying web. . After the underlying web is split longitudinally into sections for cigarette production, each vertical portion of the paper web is wound tightly on the corresponding bobbin. Thus, the waveform is folded to match the width reduction caused by shrinkage in the stripe area, sometimes causing wrinkles in the stripe-free area. Such shrinkage of wrapping paper is generally not acceptable in tobacco rod production. This contraction effect can be easily observed in FIGS. 6OA, 6OB, and 6OC. These figures are optical microscopy images of the corrugated areas between the printed stripe areas, where a single application of film forming material was applied at 5.5 ×. The film forming material used contains 22% starch and 40% chalk or calcium carbonate.

Therefore, shrinkage of the stripe area appears to cause wrinkles in the stripe-free or unprinted area of the wrapper. In addition, the mechanism is not fully understood, but the addition of an anti-wrinkle agent to the starch solution appears to make the printing layer or streaked area more flexible. This flexibility makes the printed starch layer more elastic. This flexibility also reduces the infiltration of the print layer into the paper structure, allowing the print layer to stay more on the surface of the paper web. Regardless of whether these mechanisms, combinations of these mechanisms, or some other mechanism are active, the information indicates that when the wrapper shrinks, the enhanced elasticity of the layer or stripe area will reduce the likelihood that the layer or stripe area will separate from the wrapper. Indicates. Moreover, the elasticity of the layer or stripe area allows the layer or stripe area to be dimensionally matched with the underlying paper as the applied solution dries; Thus shrinkage of the stripe zones is reduced, and at the same time wrinkles and / or wrinkles between the stripe zones are also reduced. Thus, incorporation of the anti-wrinkle agent into the starch solution weakens the wrinkles.

The effect of adding the anti-wrinkle agent to the film forming material can be easily seen in FIGS. 6OD, 6OE, 6OF, 6OG, 6OH, 60I, which is an optical micrograph of the area between the printed stripe areas under the same conditions as in FIGS. 60A-G. . In Figures 60D-60F, glycerin was used as the anti-wrinkle agent. The film forming material was applied at 5.5X and contained 22% starch, 40% chalk and 20% glycerin. In Figures 60G-60I, 1,2 propylene glycol was used as the antiwrinkle agent. In these figures, the film forming material was applied at 5X and contained 22% starch, 40% chalk, and 100% propylene glycol. 60 shows the surprising effect on printed striped paper obtained by adding the anti-wrinkle agent to the film forming material.

A further advantage of the antiwrinkle agents described herein relates to the film forming properties of the solution. More particularly, the incorporation of the antiwrinkle agent into the additive material appears to enhance the film forming properties of the additive material with respect to the surface of the base web to which the additive material is applied. This improved film forming feature is believed to enhance the ignition propensity performance of striped wrappers constructed from additional materials. Moreover, the film forming feature can sufficiently enhance the desired barrier effect of the layer, reducing the number of application of the multi-pass required by the solution without the anti-wrinkle agent. Using anti-wrinkle agents, single pass operation is possible by the addition of sufficient drying capacity.

Some additional benefits have been observed when using 1,2 propylene glycol as the anti-wrinkle agent. In particular, 1,2-propylene glycol can be effectively used when the weight of 1,2 propylene glycol versus starch weight in solution is about 100%. In contrast, glycerin can be effectively used when the weight of glycerin to starch in solution is less than 40%, since drying time for starch and starch plasticizer solutions is not allowed at this ratio. This difference in drying time can be from the difference between the boiling point of glycerin (290 ° C.) and the boiling point of 1,2-propylene glycol (187.3 ° C.); This difference is about 100 ° C. For 1,2 propylene glycol, the boiling point is closer to the boiling point of the aqueous solvent than the boiling point of glycerin.

By adding an anti-wrinkle agent to the starch solution, the permeability of the stripe area is improved, i.e. the permeability is more uniform and lower than the permeability of the stripe without plasticizer. This phenomenon is important because it allows the application of the required amount of starch solution to be applied or printed in a single printing step. Those skilled in the art will appreciate that a number of printing steps have conventionally been required in order to perform the necessary permeability reduction in the striped area. Of course, it may still be desirable to continue using the multi-layer print job for other reasons.

Calcium carbonate

Calcium carbonate or chalk is preferably added to the nominal starch solution in addition to the anti-wrinkle agent, and the weight of the chalk ranges from 0 to about 100% of the starch weight in the nominal solution; Preferably in the range of about 40% to about 100%; Most preferably in the range of about 40% to about 100%; A level of about 60% is a desirable goal. Choke may be added to the nominal starch to adjust the reflectance of the resulting additional material to be compatible with the reflectance of the uncoated base web material. By this reflectance, the stripe zones constructed from additional materials are less visible to casual observers.

The ratio of CaC0 ₃ to starch will be an important factor in determining the ignition propensity and self-extinguishability of smoking articles made from the packaging of the present invention when produced by high speed printing. The CaC0 ₃ starch ratio is determined by the weight ratio of calcium carbonate to starch in the zone of the additive material. More particularly, a ratio of CaCO ₃ to starch of less than 0.8 is desirable to achieve the desired ignition propensity performance with improved self-extinguishing (at 0 ° C.) of less than about 25%. CaCO ₃ is included in the construction of the embodiment described with reference to FIG. 10 to enhance self-extinguishing performance among other reasons described herein.

From the foregoing description and the accompanying drawings, those skilled in the art will understand that a method for producing a striped wrapper for smoking articles has been described. In the manufacturing process, the stripe zone 126 (see FIG. 2) of the additional material is installed in a spaced position on one surface of the base web 123. The spacing of these striped zones 126 may be selected to be significantly greater than the width of these striped zones 126 in the longitudinal direction 142 of the base web 140.

The width of the stripe zone 126 may be selected to fall in the range of about 5 mm to about 10 mm; The spacing between these stripe zones 126, which is measured as the distance from the trailing edge of one stripe zone to the leading edge of the next adjacent stripe zone, ranges from about 12 mm to about 40 mm.

Preferred Starch Compositions and Their Preparation

The striped zone of the present invention preferably comprises an aqueous solution containing starch, chalk or CaCO ₃ , and an anti-wrinkle agent. Although several types of starch are contemplated, tapioca starch is preferred as the starch component of the current layers 210, 212, 214 (FIG. 10). A suitable starch commercially available is FLO-MAX8 from National Starch & Chemical Co.

Unexpectedly, it has been found that the formation of smoking articles from patterned base paper with certain properties of starch material results in certain patterns resulting in very low ignition tendencies. Even more surprisingly, it was recognized that within standard specifications for some well known starch materials, batch-to-batch changes in material characteristics could affect the ignition properties of the resulting smoking article. For example, specifications of oxidized tapioca starch commercially provided by National Starch & Chemical Co., such as Flo-Max 8, have a pH in the range of 4.5 to 6.5 in 1% solution and the particles have a molecular weight of greater than 10,000. Indicates. Surprisingly, if a given pattern is applied to a base web with Flo-Max 8 having a pH of about 6 to about 6.5, the ignition performance is less than about 6, but other batches of Flo-Max 8 that fall within the manufacturer's specification range Compared with the.

Various balance or trade-offs are required to select starch coefficients for use in applying the film to the wrapper. For example, high molecular weight starch can lead to an efficient reduction of permeability, while such high molecular starch is used at low concentrations, as a result of which the solution has a very high water content. However, high water films are much more difficult to dry effectively in porous packaging. Moreover, it has been found that the surface tension of the starch solution affects the retention of small bubbles; Low surface tension allows smaller bubbles to remain in solution, while high surface tension provides more uniform and consistent material for bubbles to agglomerate out of solution and applied to the wrapper.

Although not fully understood, it is believed that the preferred pH range of oxidized starch results in a lower degree, or less complete oxidation, of the starch polymer chain, which provides longer polymer chains than starches that are more acidic (ie, lower pH). .

In addition, longer polymer chains result in solutions with higher viscosities. The higher the viscosity of the starch solution, the better the conversion when applied to the packaging in the printing process.

Based on this understanding, it has been found that a significant improvement in the ignition propensity of patterned wrappers is caused by starch solutions having special and improved properties. These features of aqueous solutions comprising oxidized starch include a pH ranging from about 6 to about 6.5; Surface tension of at least about 6.5.10-2 N / m (65 dynes / cm); Room temperature viscosity up to about 50 mPa · s (50 centipoises); And particle sizes in the range of about 4 μm to about 40 μm for dry particles, about 90% when wet, in the range of about 10 μm to about 100 μm. Moreover, the particles preferably have a molecular weight such that the solution can have a starch concentration in the range of about 14% to about 24%. Preferably, the starch comprises oxidized tapioca starch.

Starch aqueous solutions used for application to basic webs or wrapping papers typically have dry starch powders of the desired weight in order to obtain a starch / water mixture having a reselected concentration of water at room temperature of the desired weight (ie, about 15 ° C. to 25 ° C.). Prepared by first mixing with a starch / water mixture.

For example, 20 parts by weight of starch is mixed with 80 parts by weight of water to prepare a starch / water solution having a reselection concentration of 20%. The starch / water solution is then subjected to a temperature below the boiling point of about 90 ° C. to about 95 ° C .; That is, it is heated to a temperature lower than the boiling point. The starch / water solution is maintained at elevated temperature for about 20 to about 30 minutes for thermal soaking. The starch / water solution is then cooled to room temperature. This cooling step can occur passively, such as with natural heat transfer processes; Alternatively, the cooling step can take place in a cooling bath or using an existing mechanical cooling system. The starch / water mixture is stirred throughout the mixing step, heating step, heat soaking step and cooling step. Agitation can be continuous or quite continuous. If additional ingredients such as calcium carbonate are incorporated into the starch / water solution, these ingredients should be added after the starch / water solution has returned to room temperature after the heat soaking step.

Aqueous starch solutions having the features specified above and prepared by the above methods, by way of example, include, but are not limited to, gravure printing, offset printing, inkjet printing, spraying, and die printing. Can be applied to the web. Other printing processes are also suitable and within the scope of the technology herein. However, preferably gravure printing can be used to apply the starch solution to the underlying web to obtain a patterned wrapper.

Surprisingly, it has been found that the CaCO ₃ / starch ratio is an important factor in determining the ignition propensity and self-extinguishability of smoking articles made from the packaging of the present invention made by high speed printing. The CaCOs / starch ratio is also measured by the weight ratio of calcium carbonate to starch in zone 126 of the additional material, ie both layers. More particularly, a CaCO ₃ / starch ratio of at least about 35% is preferred to achieve ignition propensity and less than about 25% self-extinguishing (0 °). More preferably, a CaCO ₃ / starch ratio of at least about 45% is preferred to achieve ignition propensity and less than about 20% self-extinguishing (0 °).

If desired, the layer 150 (see FIG. 3) printed on the base web 140 can be a starch layer, and the layer 152 can be a layer comprising a mixture of starch and calcium carbonate. However, the presently preferred arrangement places a mixture of starch and calcium carbonate in the first layer 150 and only starch in the other layer 152.

It was observed that (i) the optical reflectance of the base web 140 and (ii) the optical reflectance of the mixture of starch and calcium carbonate were quite similar. In fact, these two reflectivities are quite similar, making the operation of the optical irradiation facility difficult. On the other hand, it has been found that the optical reflectance of (i) the optical reflectance of the base web 40 and the optical reflectance of the layer containing (ii) starch are quite different.

Other reflectance properties of layers 150 and 152 are advantageously used to enhance the optical inspection properties of the wrapper herein. With the starch layer mounted on top of the starch-calcium carbonate layer, optical inspection of the wrapper is significantly enhanced. More particularly, as the base web 140 advances from the feed bobbin to the take-up bobbin via gravure printing equipment, the web 40 also passes through the inspection station. At the inspection station, the light source is focused on the moving web 140. The light beam emitted from the light source is reflected at the surface of the moving base web 140 and the reflected light is collected by the sensor. As each zone 126 of additional material moves through the inspection station, zone 126 disturbs the light beam and modulates the light source reflected back to the sensor. Because the reflectance of the starch layer is different from the reflectance of the base web 140, the sensor can be configured to detect the presence or absence of the zone 126. Combined with the supply associated with the speed of the base web through the inspection station, the sensor is more sensitive between the neighboring zones and the width of the zone 126 in the longitudinal direction of the base web 140 for quality control and manufacturing consistency. The vertical spacing of can be measured. With regard to the examination of striped areas, see US 5 966 218 and US 6 198 537, incorporated herein by reference.

Surprisingly, it has been observed that as the calcium carbonate levels increase in the stripe zone 126 exposed to optical inspection or machine vision systems, the reliability of these systems decreases. Reliability reduction appears to result from increased reflectance of the surface of the striped region 126. This increased reflectivity overwhelms or “unreadables” the inspection system—this phenomenon is presumably because the reflectance of the striped region 126 with high calcium carbonate levels is similar to and substantially similar to that of the underlying web itself. Because it is the same. Reflectance parity is likely to occur when the calcium carbonate level in the surface region of the striped region 126 is greater than 80% of the starch level in the surface region of the striped region 126.

The reflectance slope problem can be mitigated by installing a structure against the stripe zone 126 where the surface zone has a reflectance significantly different from that of the base web, and the inspection system, for example, has the presence of a change in reflectance (striped zone). The beginning or the end of 126), the absence of reflectance change (missing stripe zone 126 or misplaced stripe zone 126), and the spacing between the longitudinal extension or stripe zones 126 of stripe zone 126; Continually check the reflectance change (eg, how long a particular reflectance lasts at the detected speed or speed of the base web through the inspection station) to identify the coefficients associated with the stripe zones 126. One way to install the required structure for the stripe zone 126 is to provide an increased layer of calcium carbonate at a position farther from the inspection system than the layer with the starch in nature. In other words, by placing the starch layer on the calcium carbonate-containing layer, the efficacy of the optical inspection system will not be disturbed and will continue to be effective.

This arrangement of the layers in the stripe zone 26 provides another surprising and advantageous property to the wrapping paper. If the first layer of the stripe zone 126 applied to the base web contains both calcium carbonate and starch, then the presence of the stripe zone 126 is the side of the base web facing the side to which the stripe zone 126 is applied—ie the machine It is less clear when observed or investigated from the opposite side of vision. In fact, as the level of calcium carbonate reaches the high level, which is the subject of this specification, the presence or presence of the striped zone 126 becomes less visible to the consumer and in fact becomes substantially invisible to the average consumer.

Such visual interception is important because consumers of smoking articles are accustomed to products with a uniform wrapping paper and a homogeneous appearance. The preferred arrangement of the layers 150, 152 (see FIG. 3) provides a further important advantage to smoking articles made using the packaging paper of the present disclosure.

Similarly, various types of calcium carbonate particles are considered to be within the intent and scope of this disclosure. However, calcium carbonate, such as SOCAL 31 from Solvay Chemicals, Inc., is currently commercially available calcium carbonate. SOCAL 31 is ultrafine, precipitated calcium carbonate with an average particle size of about 70 nm (nanometers). Larger particles of calcium carbonate have not been observed to work well with this application compared to ultrafine precipitated calcium carbonate, which at least partly has a tendency to precipitate out of solution faster and at least partly with the advantageous features discussed herein. Is due to the demand of better quality to obtain.

The materials used in the additional material zone may be important for the ignition propensity and self-extinguishing performance of smoking articles produced using the wrappers discussed in the present invention. In one embodiment, the zone of additive material will be printed with a starch solution comprising an anti-wrinkle agent. Starch water solutions are preferred because the aqueous components are easily dried, but starch non-aqueous solutions are also within the intent and scope of the present invention. In another embodiment, the zone of additive material will be printed with a solution comprising a mixture of calcium carbonate (or chalk) particles, starch and anti-wrinkle agent. As starch and anti-wrinkle solutions, solutions comprising calcium carbonate (or chalk) particles, starch and anti-wrinkle agents are preferably applied as aqueous solutions, but non-aqueous solutions also fall within the intent and scope of the present invention.

In other words, the present specification is intended to add (i) an anti-wrinkle agent or (ii) a combination of an anti-wrinkle agent and calcium carbonate to an aqueous nominal starch solution to obtain an additional solution to be used for printing.

As discussed in more detail above, the incorporation of the anti-wrinkle agent into the starch solution allows the starch aqueous solution to be applied to a single printing step or to be laid in layers on an underlying paper web. Although anti-wrinkle agents can be used in multi-layered structures for striped areas applied in multiple printing steps or passes, the benefits of anti-wrinkle agents arise from using them in the first layer applied to the base web.

From the above discussion, those skilled in the art will understand that many different patterns for the striped area of the wrapper fall within the intent and scope of the present invention. For example, a pattern has been described that includes a plurality of transversely extending solid bands (see FIG. 2). The solid band may extend horizontally, vertically 220 (see FIG. 11) or spiral 222 (see FIG. 12). The term solid in the present invention means that the additional material zone is applied in a single step.

The above discussion is also evident that a zone of additional material can be applied in two or more successive steps or applications, if necessary. Gravure typography as well as other typography are well suited for such continuous steps or for multiple applications.

Improve self-extinguishing performance while maintaining ignition propensity

As described above, it is desirable to achieve ignition propensity performance that meets and exceeds government requirements. This is accomplished with a solid band arrangement as described with reference to FIG. 10. Moreover, as described above, desirable ignition propensity performance often adversely affects the self extinguishing performance of smoking articles. Unlike the description, ignition tendency performance meets or exceeds government requirements, while ignition tendency performance is typically associated with smoking articles that are self-extinguishing and 100% self-extinguishing when the smoker is at hand. Smokers generally do not like to re-ignite smoking articles, so improving self-extinguishing performance while maintaining ignition propensity performance contributes to the very desirable properties for improved packaging. Applicants have found an arrangement of striped zones on packaging that provides this improved self-extinguishing performance while maintaining ignition propensity performance. For example, in the embodiment described with reference to FIG. 10, the incorporation of the choke component contributes to enhanced self-extinguishing performance among other properties.

In addition to or instead of applying chokes to improve self extinguishing performance, certain stripe arrangements and patterns described herein are useful in the construction of smoking articles having both improved self extinguishing performance and desired ignition tendency performance. For example, the slit stripe arrangement as shown in FIG. 5 or the like does not sustain smoke generation when placed adjacent to the substrate, but can better maintain smoke generation during free burn.

Referring to Table V, Wrapping Paper A has three zones of about 2 mm each and a slit stripe arrangement of 6 mm overall width, for striped areas printed at an additional speed of various areas of about 3.5x to about 5.5x. Include. The addition of 5.5x speed gets the additional material of about 8g / m ² to about 9g / m ² on a dry weight basis, wherein a nominal basis weight of the wrapper is about 26.5g / m ^2. Lower addition rates are expected to provide controlled values proportional to the weight of the additive material measured on a dry weight basis. The width of the stripe zone is typically measured in the longitudinal direction and has an image of 27 mm (ie, the distance from the leading edge of the stripe zone to the leading edge of the next or subsequent stripe zone).

Table V

In Table V, the "stripe zone arrangement" simply represents the width of the portions of the stripe when viewed in the advancing direction of the coal in the burning tobacco rod. Therefore, the 2.5-2-2.5 arrangement (see FIG. 5) of the stripe zone 126 is 2.5 mm in the first portion or region 202 (see FIG. 6) of the entire stripe zone width and the second portion of the entire stripe zone width or This means that the area 203 is 2 mm (and can be spaced), and the third portion or region 204 of the overall stripe area width is 2.4 mm. Here, the first part 202 is first met by the advancing coal of the burning tobacco rod, the second part 203 is next met by the advancing coal, and the third part 204 is advancing the advancing coal. Met by the end.

Table VI-Details on Wrapping Paper A

Table VII-Details on Wrapping Paper B

Table VIII-Details on Wrapping Paper C

Table IX-Details about Wrapping Paper D

Table VI-IX shows that the multizone stripe zone 126 (see FIG. 5) is manufactured in a single pass printing process at the application rates indicated in these tables. In each of the wrappers A to D, the additive material preferably comprises an aqueous solution containing starch, chalk or calcium carbonate, and 1,2 propylene glycol. Currently preferred mixtures for such aqueous solutions include starch, chalk and 1,2 propylene glycol in weight ratios of about 100 (starch), about 40 to about 80 (choke), up to about 100 (1,2 propylene glycol). Starch alone will range from about 20% to about 24% in aqueous solution.

Some changes in the relative proportions of the composition of the additive material may change when the aqueous solution is applied to the base web and dried. For example, the information indicates that when 1,2 propylene glycol is used as anti-wrinkle agent, about 50% to about 60% of the propylene glycol added to the solution remains in the additive material when dried in the paper web. Some weight loss can occur in other anti-wrinkle agents during the drying process. However, this weight loss was not observed for the starch and calcium carbonate components of the additive material during the drying process.

Zone 126 of additional material is substantially continuous horizontally of the paper web, as shown in FIG. 2, or vertically defined as a C-shaped zone when formed into a tobacco rod wrapper as shown in FIG. 7. Several bow-shaped portions having one or more separations extending, or generally symmetrically positioned around the tobacco rod, as seen in cross section across the longitudinal axis 134 of the tobacco rod 122, as shown in FIG. 8. It may have 127 '.

In addition, the zone 126 of additional material on the wrapper 123 is a distance w that normally does not exceed the width of the ring 126 as measured in a direction generally parallel to the axis 134 of the tobacco rod 120. Can be divided into one or more substantially ring-shaped portions that are separated from each other along the axis 142 (see FIG. 5). This spacing characteristic provides a "slit" to the stripe structure.

The zone 126 above the wrapper 123 may include a number of pieces 127 lying around the columnar tobacco rod 122 (see FIG. 8) and a piece 127 ′ of the peripheral zone 126. Circumferentially lies from a piece of another neighboring zone 126. In addition, the pieces 127, 127 ′ may be arranged according to a predetermined pattern as described in US Patent Application No. 60 / 924,666, which is hereby incorporated by reference in its entirety.

The zone of additional material is preferably arranged in a single layer 210 (see FIG. 9). It should be noted that the representation of the basic web cross section of FIG. 9 is schematic. As discussed above, the actual cross section of the base web is one piece that penetrates through the numerous fibers that form the base web. For cigarette wrappers, the thickness is about 30 microns (ie, 30 x 10 ^-6 meters or 30 μm). The actual thickness of the additive material is ≦ 2 μm, and the additional material tends to infiltrate and conform to the surface provided by the fibers of the base web. As a result, the material erected in the zone of the additional material is roughly box-like (FIGS. 3, 6, and 9), but in reality is hardly recognized by the naked eye. For this purpose, if multiple layers are used to form additional material zones, the resulting structure is almost impossible to break up into individual layers. Decomposition into individual, separate layers is more complicated when an aqueous solution is applied, since subsequent layers re-wet the existing layer and allow choke-like components to settle through the material of the preceding layer.

The application rate of the material in the preferred single layer (see FIG. 9) will be in the range of about 4X to about 6X. For this, "X" has been described above. If the nominal CORESTA value of the underlying web is about 33, the preferred application rate of about 5X is currently considered to be appropriate. If the nominal CORESTA value of the base web is about 60, a preferred application rate of about 5.5X is currently considered to be appropriate.

Although it is preferred that the zone of additional material be applied in a single pass, application or layer, the present specification also intends the application of the additional material in multiple application steps or layers (see FIG. 10). In this embodiment, the first layer 210 is applied to the surface of the base web 123 in the first gravure print station and then dried, and the second layer 212 (see FIG. 10) of the additional material is, for example, the second print station. It can be applied to wrapping paper. If desired, a third or later layer 214 may be applied at the additional print station. The second layer 212 may be arranged to overlie the first layer and to be substantially co-spaced. Optionally, the second layer 212 may cover only one or more portions of the first layer 210. The relative rates of application of the layers need not be the same and are preferably different. For example, one layer may be at least about 1.5 times to about 3 times the thickness of the other layer.

For example, smoking article 120 (see FIG. 13) may include one or more striped zones 250 spaced apart from each other along the axis of smoking article 120. Each stripe zone 250 comprises an additional material applied such that at least one longitudinally extending gap 252 is present between the distal portions 254 of the stripe zone 250. The embodiment of FIG. 13 shows one gap 252 in each striped region 250; However, two or more gaps 252 may be provided around the circumference of the smoking article 120. Where one or more gaps 252 are provided, the gaps are preferably generally parallel to each other and preferably also have substantially the same distance from each other surrounding the circumference of the smoking article 120. An embodiment of a smoking article having a pair of regions where the additive material is substantially completely opposite is shown in FIG. 15. As shown, the perimeter range of the regions of the additional material 250, 250 ′ will be substantially the same as the perimeter range of the gap 252 or the gap between the two regions of the additional material 250, 250 ′.

By this arrangement, when the smoking article 120 is in the pre-burned state (FIG. 15), the zones 250, 250 ′ of the additional material are compressed by the reduced coal permeability of the combustion coal of the tobacco rod 122. To impede flow. On the other hand, in smoking articles maintained in a substantially horizontal position, the bottom gap 252 of the wrapper 123 allows air to enter the side of the tobacco rod 122 to assist in the combustion of coal. When the smoking article 120 is placed on the substrate 260 (see FIG. 14), a wide variety of situations occur. In this situation, the substrate 260 prevents air from flowing upward into the bottom portion or bottom gap 252 of the tobacco rod 122. The zone of additional material 250, 250 ′ and the substrate 260 cooperate with each other to define a much smaller area 258, 259 through which air can pass through the base web 140 of the wrapper. More particularly, the vertical zone 258 between the bottom of zone 250 and the substrate 260 and the vertical zone 258 between the bottom of zone 250 'and the substrate 260 allow air to pass through the tobacco rod. There is a significant reduction in the area reaching 122 smoky coal. As a result of the loss of oxygen in the air, the smoking coal of the smoking article self-extinguishs when the burn line reaches the opposite zone of the additional material located as shown in FIG. Conditions of substantially reduced area for air to maintain combustion of coal also exist for the rotational position of the tobacco rod 122 between the position described in FIG. 14 and the other position of the smoking article.

However, when the smoking article 120 is placed on the substrate 260 such that one of the additional material zones 250, 250 ′ is in contact with the substrate 260, the additional zone still delivers air to and passes through the base web 14. We will fully define the areas where we can. For illustrative purposes, snuffer region 262 is a region on tobacco rod 12 that can be operated to extinguish coal that burns when placed on substrate 260.

In this example, the reduction in the ignition propensity is related to the reduction in the self extinguishing value, and the improved pre-burn quality of the smoking article 120 with the wrapper with the additional material zone as in FIG. Those skilled in the art will appreciate that the self extinguishing improvement of FIG. 15 occurs in smoking articles in the horizontal position (ie, 0 °). Similar self-extinguishing improvements are also observed at other self-extinguishing evaluation positions of 45 ° and 90 °. When the smoking article 120 is placed on the substrate 260 in one of three specific arrangements, the arrangements are 45 ° away from each other (off-set) around the axis of the smoking article, and self extinguishing characteristics and desirable ignition propensity are also obtained. Of course, the discussion goes this way for brevity. The pattern according to the present invention requires the application of a film forming compound to the paper, regardless of whether the side portion lies on the substrate 260 and in order to impair the desired pre-burn quality in the smoking article or to raise the carbon dioxide level in the mainstream smoke. It will be readily appreciated that smoking articles can be digested without. This can be understood by realizing that the opposite zone of the film forming compound need not appear exactly 90 ° in terms of contact with the substrate 260. These zones will lie between about 60 ° and 120 ° in the center of the position closer to or farther away from the side contacting the substrate 260, for example, from the side contacting the substrate 260.

In addition, for a specially selected pattern, the ability to extinguish the smoking article is further dependent on providing the minimum longitudinal length of the additional material (eg, film forming compound) rather than the individual weight per area of the film forming compound in the longitudinal position. The length of the rectangular zone will be, for example, at least about 5.5 mm in the particular design, base web, and film forming compound used. The film forming compound used must be increased to improve the ignition tendency performance without loss of pre-burn quality and self extinguishing performance, and if necessary, a combustion promoter can be applied to the paper to maintain even higher levels of addition.

Earlier, the permeability ratio 3: 1 between the base web and the additional material was thought to be insufficient to extinguish smoking articles because the decrease in permeability of the paper in the longitudinal position of the snuffer zone was insufficient. However, such a permeability ratio over a portion of the circumference of the smoking article is sufficient to extinguish the smoking article if there is an underlying substrate 260 and the additional material is on the side of the smoking article 120 and does not contact the substrate 260. Will be enough.

Another embodiment of a smoking article using the interaction between the longitudinal spaces between the additional material and the facing areas of the substrate is shown in FIG. 16. Here, a series of vertically spaced snuffer sections are spaced along the axis 134 of the smoking article 120. Each pair of regions of additional material in the snuffer zone may be referred to as pieces for quick reference.

Referring to FIG. 17, the wrapping paper 123 further includes a pair of additional materials (such as opposing pairs of areas 270d, 272d) at positions spaced along the tobacco rod 122 in FIG. 16.

Each pair of rectangular regions (e.g. 270a and 270a'-the latter is not visible in Figure 16) defines a circumferential zone 274 (e.g., zone 274a). The “width” of the stripe zone 274a is measured from the leading edge 146 (which is closest to the approaching coal) in the zone 274a to the trailing edge 148 (which is farthest from the approaching coal). Preferably the width of the zone, for example 274a, ranges from about 5.5 mm to about 12 mm, more preferably from about 7 mm to about 10 mm, most preferably from about 8 mm to about 9 mm. Furthermore, in each circumferential zone, such as zone 274a, zones 270a and 272a are circumferentially mounted so as to face each other along opposite sides of the wrapper when formed over tobacco rod 122. Preferably each region 270a, 272a is circumferentially (ie, longitudinally measured on a paper web), in the range of about 5 to about 9 mm in longitudinal measurement, more preferably in the range of about 6 mm to about 7 mm in longitudinal measurement. Extend into range.

The area between the area 276 of the base web 140 between neighboring areas 274a and 274b and the area between opposite areas within each area (such as between areas 270b and 272b of area 274a) are preferably It should also be borne in mind that there are essentially no additional materials comprising regions (eg, regions 270b, 272b).

The longitudinal distance between neighboring zones (such as between areas 274a and 274b) is called stripe spacing 276, which is preferably about 4 to about 12 mm, more preferably about 6 mm to about 8 mm.

Preferably, the respective facing areas 270 and 272 of each zone 274 are offset somewhat from those of the front row or zone and a sufficient number of zones 274 (as described below) Installed along a given tobacco rod (by selecting the width of the stripe-zone width and the stripe-zone spacing), when the smoking article is placed on the substrate, at least one location 101 is present along the tobacco rod 122 Each pair of zones 270 is arranged substantially along the side of the tobacco rod 122, such as opposite pairs of regions 250, 250 ′ in FIG. 14. This is most desirable for self-extinguishing to occur for this arrangement on the tobacco rod 122. The position along the tobacco rod 122 where this arrangement occurs most similarly is referred to hereinafter as an "oriented snuff zone".

Since the smoking article 120 may be placed on the substrate differently from the position shown in FIG. 16 and / or the pattern of the regions may be different, it may be realized that the directional snuff region may occur at various longitudinal positions of the tobacco rod 122. . The pattern of area and stripe spacing 276 may be selected to result in one or more directed snuff areas along the tobacco rod 122.

Preferably, each region 270, 272 and 272 'includes sufficient additional material to reduce the permeability of the wrapper in each region to about 0 to about 12 CORESTA, more preferably about 7 or less.

In this specification, a pattern of additional material is applied to the wrapper 123 to obtain improved ignition propensity properties and also to obtain improved self-extinguishing properties.

As currently understood, the staggered regions of the additional material according to the present description allow the smoking article 120 (see FIG. 16) to be designed to have an advantageous combination of the desired low ignition propensity value and the desired low self extinguishing value. . The pattern of the low permeability zone of the additional material provides areas of the film forming compound along the length of the tobacco rod 122, so that these areas of the additional material (such as the film forming component) may cause the smoking article 120 to pre-burn. Self-extinguishing rarely occurs when the smoker is in a state, but when the tobacco rod is placed on the substrate, it is able to cooperate with the substrate to extinguish the ignited smoking article 120. Therefore, smoking article 120 may exhibit reduced ignition propensity while maintaining a desired pre-burn quality or low self extinguishing value by applying a pattern of film forming compound to the base web in accordance with the present invention.

In order to achieve the desired ignition propensity and self-extinguishing properties of the smoking article, the pattern 300 (see FIG. 17) is preferably while the base web 123 is in an unfolded state as shown in FIG. 17, or It is applied to the base web 123 of the wrapper when the base web comprises a roll of cigarette paper to be split into bobbins. It is an object of the present invention to provide a wrapper which, when formed from tobacco rod 122, exhibits an ignition propensity value of 25 or less and a self-extinguishing value of 50 or less. More preferably, the ignition propensity value of the resulting smoking article is about 15 or less; And the ignition propensity value of the most preferred resulting smoking article is about 10 or less. Lower self-extinguishing values are also required. In this regard, more preferred self-extinguishing values are less than about 25; While the most preferred self-extinguishing value is less than about 10.

In particular with reference to FIG. 17, the transverse dimension of the wrapper 123 is selected based on the diameter (about 7 to about 10 mm) of the final smoking article and the material to allow overlapping with longitudinal seams of about 1 to about 2 mm. do. For example, to have a 1 mm overlap seam, the wrapping paper cross-web dimension would be about 27 mm for smoking articles with a circumference of about 25.6 mm.

Preferably, the pattern 300 is placed such that a plurality of circumferentially extending regions 274a, 274b, 274c, 274d (indicated by the dashed line in FIG. 17) are placed in a spaced apart arrangement along the tobacco rod 122 (in FIG. 17). Arrow 142) applied to the base web 140. The additional material may be applied to one or both sides of the base web, preferably from 3 to 6, and most preferably in the nominal length of the tobacco rod 122. Results in more than 4 to 6 zones 274. Each circumferential zone 274a, 274b, 274c, 274d has a longitudinal pitch (ie, one along the tobacco rod 122 shorter than the nominal length of the tobacco rod 122). Length measured along the tobacco rod from the beginning of the zone of to the beginning of the neighboring zone.) If the longitudinal pitch length is selected at about 25% of the nominal length, four zones will be provided for each tobacco rod 122 .

Within each circumferential zone, for example, at 274a, at least two regions of additional material are provided, for example 270a, 272a. Regions of additional materials in all figures are marked with stripes for their identity; However, in smoking article 120 or such wrapping paper 123 for smoking articles, these areas of smoking articles may or may not visually prove identical. Each of these regions preferably has circumferential spacing such that these regions face each other in the final tobacco rod 122. Furthermore, for each of the three pairs of regions, for example 274a, 274b, 274c, the regions 270b, 272b of the second zone 274b are preferably circumferentially offset from the regions 270a, 272a of the first zone. . Moreover, the areas 270c and 272c of the third zone 274c are offset from the areas 270b and 272b of the second zone 274b, and further offsets are directed to the areas 270a and 272a of the first zone 274a. It is formed circumferentially.

As shown in FIG. 17, in this embodiment, the additional material region of each zone is laterally offset in the circumferential direction from the additional region of the neighboring zone by a distance which is a function of the transverse dimension of the additional region. Each region has a width measured along the tobacco rod 122 and a transversely-measured dimension in the circumferential sense of the direction of the tobacco rod 122. In this embodiment, the region width is less than the longitudinal pitch of the relevant zone. As shown in FIG. 17, the longitudinal pitch length may be greater than the corresponding area width of the corresponding zone. The additional area of the continuous area along the tobacco rod 122 is preferably offset from the additional area of the neighboring area, whereby the pattern 300 of the area covering a portion of the basic web along a line inclined with respect to the edge of the basic web. ) Is prescribed.

In the described embodiment (FIG. 17), each region lies on the wrapping paper 123 such that the region is centered on one of the three pathways 270, 272 and 272 ′, which paths correspond to the corresponding dashed line 270,. 272 and 272 '. Thus, for example, path 270 passes through the corresponding geometrical properties of six regions 270a, 270b, 270c, 27Od, 27Oe, 27Of. Each region is separated from the other regions, but may optionally contact each other. The paths 270, 272 and 270 ′ are parallel to each other and oriented at an acute angle Φ relative to the side edge of the wrapper 123. Region 272 'is preferably the same as region 272 and is continuous over pattern 300 shown in FIG. 17, where region 270' disappears along one edge. It appears along this opposite edge. Each pair of cross-web arranged regions, such as regions 270a and 272a or regions 270b and 272b, will amount to about 33% of the total area of the corresponding regions 274a and 274b. In the case of a rectangular area, each area preferably ranges from about 8 mm to about 10 mm in the longitudinal direction or width and from about 5 mm to about 7 mm in the direction measured across the circumference. The vertical space 276 between the regions is preferably about 4 mm to about 12 mm, more preferably about 6 mm to about 8 mm. The circumferential spacing of the regions of the additional material is preferably from about 3 mm to about 20 mm, more preferably from about 5 mm to about 8 mm, most preferably from about 5.5 mm to about 7.0 mm.

When the wrapper 123 is formed with respect to the tobacco to make the tobacco rod 122, the regions of the additional material in any longitudinal position are preferably about 180 ° apart from each other. Moreover, the ratio of the area occupied by the area of additional material to the total area (the total area is the sum of the circular area between (i) the corresponding area 274d) and (ii) neighboring areas on one side) The ratio is defined as "area regional ratio") is substantially less than one. Preferably, the region area ratios range from less than about 20% to less than about 50%, more preferably from less than about 20% to less than about 35%. More particularly, in some embodiments, the area area ratio to area-occupied area for the entire area is less than 30% and less than 25%. In general, it is desirable to keep the area coverage ratio low, while high values (ie, values close to 1) are indicative of monoxide in mainstream smoke where low permeability (ie, low CORESTA) wrappers are used for tobacco rods. It is believed to increase the carbon concentration.

When the wrapper 123 is formed to manufacture the tobacco rod 122, the paths 270, 272, 272 "combine the first spiral path 272/272 '(areas 272 and 272' in Figure 17 in combination with the spiral path 272 /). 272 ') and a second helical path 270 (including spirally arranged region 270), both of which are lengthwise around axis 134, and tobacco rod 122, as shown in FIGS. 16-17. Helical paths 272/272 'and 270 (as shown in Figure 17) have a helix angle Φ and do not intersect each other. As described, both paths 270 and 272 'follow a clockwise path starting at the filter end of the tobacco rod 122 as viewed from the ignition end toward the filter end. .

The areas of the pattern 300 may be formed by applying one or more layers of aqueous film forming composition to the base web of the wrapper to reduce the permeability of the paper in these areas. Incorporating the antiwrinkle agent into the film forming composition allows the pattern to be applied in two steps as needed or in a single layer if additional dry capacity is installed. Optionally, cellulosic material can be used to form the region. If a film forming composition is used, the film forming composition may comprise water and a high concentration of blocking agent, for example from about 20% to about 50% by weight. The film forming compound may comprise one or more blocking agents such as starch, alginate, cellulose or gums and may also comprise calcium carbonate as filler. If the starch is a film forming compound, a concentration of about 24% is preferred. The film forming composition will be applied to the base web of the wrapping paper 123 using gravure printing, digital printing, coating or spraying with a mold, or other suitable technique. For example, the method of applying the film forming compound and the film forming component described in US patent application Ser. No. 11 / 500,918, which is hereby incorporated by reference in its entirety, may be selected to apply the pattern to the base web of the wrapping paper. If desired, regions of additional material may be formed by printing multiple, continuous layers, for example two continuous layers registered or arranged with one another. Moreover, when layers are used to form regions of additional material, the materials of the layers may be the same or different. For example, one layer may be starch, while the next layer may be starch and calcium carbonate (or vice versa).

A presently preferred embodiment of the pattern 300 of regions of additional material is shown in FIG. 18. As with the embodiment of FIG. 17, the area of the additional material of FIG. 18 is quadrilateral, in particular generally rectangular. Preferably, at least two areas of the additional material, for example 280a, 280b, are applied to each of the areas 274a, 274b, 274c, 274d so as to be spaced circumferentially in the final smoking article. The circumferential dimension of each region 280a, 280b is preferably less than about 50% of that measured across the unwrapped base web 123, and most preferably measured across the base web 123. Or about 25% of the circumferential cross section of the tobacco rod 122. The circumferential dimension of each region 280a, 280b is preferably about 50% of the measurement across the circumference of the base web 123 when applied to the circumferential spacing between the regions 280a, 280b. .

The longitudinal length of regions 280a and 280b plus the longitudinal spacing between regions 280a and 280b and regions 282a and 282b (ie, the vertical pitch length) is preferably three or four zones 274a, 274b and 274c. , 274d is present in the nominal length of the tobacco rod 122 of the smoking article and the additional regions of the neighboring zones are selected to be vertically spaced from each other. Preferably, the longitudinal space or “width” of the area, for example 280a, 280b (ie, the width of the area or the width of the area as defined above) lies in the range of about 8 to about 10 mm. circumferential offset between (i) areas 282a, 282b of zone 274b and (ii) areas 280a, 280b of zone 274a, x is the total of the base web 123, about 10 of the unpacked cross-section It is preferably in the range of from about 35%. More preferably, the circumferential offset, x, is in the range of about 12% to about 35% of the total, unpackaged cross-section of the base web. Most preferably, the circumferential offset, x, is about 1/2 of the circumferential dimension or cross-sectional measurement of the additional regions 280a, 280b. In other regions 274c and 274d the regions of additional material are further offset circumferentially by the same offset with respect to each other, x. For example, in zone 274d, one of the areas 286a, 286c of additional material is distributed between the two edge portions of the base web 123 when the base web is unwrapped.

The pattern 300 lying between the zones 274a-274d is preferably repeated along the length of the base web 123. Obviously, if the circumferential offset, x, is less than 12.5% of the cross-direction width of the base web, more than four zones will define the overall cycle or phase length of the pattern 300. Conversely, if the circumferential offset, x, is greater than 12.5%, less than four zones (as in the case of the pattern of FIG. 17) will define the total cycle length for the pattern 300.

Further embodiments of the pattern (see FIG. 19) use quadrilateral regions 290a, 290b, ie substantially parallelogram-shaped regions of additional material. Regions 290a and 292a are arranged to be generally spirally aligned with one another when the wrapper is formed from tobacco rod 122, while parallelogram shaped arrangements 290, 292, 294 and 296 can be selected as desired. have. For example, even if the normal helical shape is lost, a mirror image (shaped in the vertical direction) can be used. On the other hand, the distortion of the parallelogram region can vary as desired. In general, however, the circumferential dimensions, circumferential spacings or offsets, longitudinal dimensions and longitudinal spacings or offsets of regions 290, 292, 294, 296 and zones 31a-31d of the present embodiments are as described in other embodiments. Can be selected as well.

Another embodiment of the pattern 300 (see FIG. 20) uses quadrilateral regions 310, 312, 314, 3160, ie substantially trapezoidal regions of additional material. In other words, the trapezoidal regions 310a and 312a will generally be arranged such that they are generally in a spiral arrangement with each other when the wrapper is coupled to the tobacco rod 122. In addition, the actual shape of the trapezoidal regions 310, 312, 314, 316 can be selected as desired. For example, the distortion of the trapezoidal region, and the ratio of the trapezoidal region, can vary as desired. Generally, however, in this embodiment, the circumferential dimension, circumferential spacing or offset, longitudinal dimension, and longitudinal spacing or offset of regions 310, 312, 314, 316 and regions 274a-274d are as described in other embodiments. Can be selected as well. It is preferred that the leading edge 142 is longer than the two parallel edges of the area 310.

Another embodiment of the pattern 300 (FIG. 21) generally uses triangular regions 320, 322, 324, 326 of additional material. In general, triangular regions 320a and 320b of zone 274a may be constructed and arranged to contact corresponding general triangular regions 322a and 322b of next neighboring zone 274b. If the desired ignition propensity and self-extinguishing properties require this, the triangular regions 320a, 320b of the first zone 274a will generally be spaced longitudinally from the triangular regions 322a, 322b of the neighboring zone 274b. . Depending on the properties required for the design of the smoking article, the triangular zone is generally such that the combustion coal of the smoking smoking article meets the dimension of the progressively increasing crossover of the triangular top and general triangular regions (ie, from right to left in FIG. 21). Or, the combustion coal of the smoking smoking article may be oriented such that it meets the bottom of the triangular region and meets a sudden enlargement in the low permeability region (ie, from left to right in FIG. 21). The circumferential spacing of these triangular regions 320, 322, 324, 326 and the size of these triangular regions may be determined in accordance with the preferred ranges described elsewhere herein. Moreover, the triangular region may be an isosceles triangle as represented, or may be an isosceles triangle, or a right triangle, or any other triangle shape as desired. Generally, however, in this embodiment, the circumferential dimension, circumferential spacing or offset, longitudinal dimension and longitudinal spacing or offset of regions 320, 322, 324, 326 and zones 274a-274d may be selected as described in other embodiments. have. Preferably the triangular shape of the region 320 is arranged such that the leading edge 146 (closest to the approaching coal) is installed.

The operation of these embodiments on the wrapper pattern 300 is best understood in view of FIGS. 22-24. These figures represent three different poses of the smoking article 120 placed on the substrate 260 and illustrate the cooperation that occurs between the substrate 260 and the area of low permeability additive material. One posture (see FIG. 22) represents a side view of a smoking article 120 in accordance with the present disclosure. The rotation of the smoking article (clockwise from the left end of FIG. 22) at an angle of 45 ° with the vertical axis results in a front view similar to that shown in FIG. 23. Similarly, further rotation of the smoking article 120 (also clockwise from the left end of FIG. 22) at another 45 ° angle is a front view as shown in FIG. 24. In each of FIGS. 22-24, at least one pair of regions of additional material, for example, regions 332, 332 'of FIG. 2, regions 324, 324' of FIG. 23 and regions 326, 326 'of FIG. It is located on the side of the smoking article in a position along the length of the tobacco rod 122. In these locations where regions 332, 332 ′ of the additional material are located substantially on the side of the smoking article 120 (FIG. 26), regions 332, 332 ′ are substantially perpendicular or generally upright with the surface of the substrate 260. to be. The arrangement of the regions 332, 332 ′ is best described in FIG. 27, where the facing regions 32, 332 ′ are smoking when viewed in a cross section substantially symmetrical with respect to the diameter of the tobacco rod 122. It lies on the corresponding opposite side of the article, the diameter of which is positioned substantially parallel to the surface of the substrate 260.

The orientation of the regions of the additional material in different longitudinal arrangements along the smoking article 20 is shown in FIGS. 25 and 26. In FIG. 25, regions 330 and 330 ′ of additional material are positioned such that one region 330 is in contact with the substrate 260. Areas 334, 334 ′ of smoking article 120 in FIG. 22 may also be positioned as in FIG. 25 when viewed from the right side of FIG. 22. In FIG. 26, one region 336 ′ contacts the substrate 260, and the other facing region 336 lies on top of the smoking article. With reference to FIGS. 22-24, irrespective of each position of the smoking article 120 having the pattern of regions of the additional material described, at least one pair of opposite regions of the additional material may be as shown in FIG. 25 or FIG. 27. Or a rotational position between these positions. This location was named Snuff District, which was directed above.

Thus, the helically rotated pose of the facing area of additional material, regardless of which side of the wrapper lies with respect to the substrate 260, when the combustion line reaches the longitudinal position, at least one longitudinal position is determined by the region. This results in a situation where the film forming compound is in a lateral position that is not in contact with the substrate 98 with a geometry and sufficient additional amount that can associate with the substrate to self-extinguish the smoking article. This fact results in improved ignition propensity performance of the smoking article and allows the smoking article to be designed to have an ignition propensity value of less than 25. Nevertheless, in the absence of the substrate 260, the smoking article does not self-extinguish while pre-burning, such as when the smoking article is held by the smoker. This fact improves the self-extinguishing performance of the smoking article and allows the smoking article to be designed to have a self extinguishing value of 50% or less, the self extinguishing value will be the self extinguishing average value, and the self extinguishing value at 0 ° is self extinguishing It will be much lower than average and less than 25%.

In this embodiment, the smoking article generally has a circular cross section. Therefore, either side of the smoking article can be stopped relative to the substrate 260. However, the pattern as described herein, with respect to FIGS. 14 and 15, is characterized in that the combustion characteristics (ignition propensity value of 25% or less and self extinguishing value of 50% or less) may be applied to any side of the smoking article. It can be recognized whether or not it can be stopped. Preferably, the pattern is such that when the base web wraps around the tobacco rod 122, the region of the film-forming compound is positioned at one or more (preferably at least two) portrait positions along the tobacco rod 122. It is chosen to appear on the opposite side that is not in contact with the.

If desired, the region of additional material may also include other geometric shapes other than quadrilaterals, including, for example, ellipses, other polygons, and the like. Moreover, the helix angle Φ can be increased while maintaining the dimensions of the same area as the described embodiment. These changes can be placed in the regions in overlapping patterns (or in regions close to each other). Optionally, the helix angle is the same as in FIG. 17 while the cross-direction dimension of the region or piece is increased, so that a spiral pattern with layers can be formed and / or the same size region shown in FIG. 17 between each piece. And pieces 270, 272, and 272 "along 12 pieces instead of 6 pieces along piece 270).

Slit Banded  area

Other patterns for the zone of additional material are naturally within the scope of the present invention. Moreover, the incorporation of the anti-wrinkle agent in the aqueous solution used to form the striped area allows complex patterns to be performed.

For example, in another embodiment, the striped region may comprise first, second and third regions of additional material, which may be applied by any of the methods herein, wherein the second region is preferably Includes a hole filled by the blocking material that melts or evaporates when the combustion coal reaches the stripe zone, and the permeability of the second region is increased by the hole.

Therefore, the wrapping of the smoking article includes at least one transverse striped region having a base web and first, second and third regions. The first and third regions comprise additional material, which reduces the permeability of the wrapper. Each of the first and third regions may be characterized in that if the first or third regions are individually applied to the wrapping of a smoking article, the smoking article is under statistically significant occurrence of burn through and free burn conditions (eg, , After testing 20 to 50 cigarette batches) are statistically indicative of little or no self-extinguishing. The sum of the widths of the first and third regions is such that if the regions were applied to the wrapping of the smoking article as a single continuous band (without slit or other discontinuity), then the smoking article did not statistically have little or no total melt and under free burn conditions Self-extinguishing is statistically significant. The first and third regions are separated by the second region. The wrapper has greater permeability along the second region than along the first and third regions. The second region is smaller than the width of the first and third regions (the width of which may be the same or different), so that the ignition smoking ends comprising the first, second and third regions are first and third. Compared to smoking articles with wrappers in which the three regions were applied on it as a single continuous band, the occurrence of total melt shows a statistically reduced occurrence of self-extinguishing under Freeburn conditions with little or no statistical occurrence. Preferably, the first and third regions are made of uniform additive material across the first and third regions. Optionally, the second region can have essentially the same width as the first and third regions.

The total weight of the additive material of the striped zone is preferably in the range of 0.5 g / m ² to 15 g / m ² . Conventional cigarette paper is permeable and permeability is usually denoted CORESTA, which indicates the permeability of the paper at a volume flow rate (ie cm ³ / sec) per area (ie cm ² ) per unit pressure drop (ie, cm of water). Unit. The permeability of cigarette paper generally exceeds 20 CORESTA and preferably the permeability of the cigarette paper is about 33 to about 60 CORESTA and the basis weight is about 22 g / m ² to 30 g / m ² . However, the permeability through the striped region and underlying cigarette paper is preferably 0 to 15 CORESTA. Permeability reduction preferably limits the air flow required to support combustion of cigarette coal around the stripe area.

The first and third regions preferably have a basis weight (g / m ² ) greater than the intermediate second layer; For example, the basis weight of g / m ² of the first and third regions is at least twice the basis weight g / m ² of the second region. The second region may comprise a gap. As used herein, the term "gap" refers to a discontinuous region of the striped region, between the first and third regions, lacking a permeability reducing additive material (ie, containing no layer of permeability reducing additive material). To aid in combustion in the second region, the wrapper may include iron oxide in place of the second region. The second region preferably has greater permeability than the first and third regions.

The at least one horizontal stripe zone preferably comprises a first printed layer in contact with the base web, and preferably a substrate having a basis weight (g / m ² ) above or greater than the first printed layer, preferably on the first printed layer. It includes two printed layers. However, the second and / or subsequent layers may have a basis weight less than the first layer. For example, the second basic weight (g / m ²⁾ of the printing layer may baeil at least two of the basis weight (g / m ²⁾ of the first printed layer. In one embodiment, the second region may comprise a single printed layer and the first and third regions may each comprise at least two printed layers (more preferably three or more layers). Optionally, the first and third regions may each comprise at least three or four printed layers, and the second region may comprise only one or two printed layers or no printed layers.

Striped areas of the base web preferably do not include a permeability reducing additive material. As described below with reference to FIG. 30, the horizontal stripe area will include more than three regions. For example, the horizontal stripe region includes, for example, five regions, the second and fourth regions separate the first, third and fifth regions and the wrapper along the second and fourth regions. It has greater permeability along the first, fifth and fifth regions.

Also provided is a wrapping of a smoking article that includes a base web and a horizontal stripe section of additional material. The transverse stripes zone is designed to cause combustion of a smoking article that includes the transverse stripes zone when placed on the substrate. The wrapper further includes a more permeable intermediate region along the transverse stripes region so that the self-extinguishing occurrence of the smoking article comprising the wrapper is statistically reduced than without the intermediate region.

In a further embodiment, the wrapping of the smoking article includes a base web and at least one horizontal stripe zone, including first, second and third regions, over the base web. The at least one horizontal stripe zone may be free of fillers and optionally at least one of the areas may be at least partially formed of additional material comprising the fillers. The additional material may preferably evenly cross the first and third regions. The first and third regions are outside of the second region and the entire wrapper structure in the first region has greater permeability compared to the entire wrapper structure in the first and third regions.

Additionally a wrapping of a smoking article is provided comprising a base web and at least one horizontal stripe zone comprising first, second and third regions on the base web. The first and third regions are outside of the second region, the second region is more permeable than the first and third regions, and the second region and the first and third regions comprise additional material.

Moreover, there is provided a method of making a striped wrapper for a smoking article comprising supplying a base web and forming at least one horizontal stripe zone comprising first, second and third regions on the base web. The first and third regions are outside of the second region, the second region is more permeable than the first and third regions, and at least the first and third regions are formed of additive material without filler. Optionally at least one of the regions is formed of an additive material at least in part comprising a filler. The additional material preferably evenly crosses the first and third regions.

Also provided is a method of making a striped wrapper of smoking articles, the method comprising providing a base web and forming at least one horizontal stripe zone comprising first, second and third regions on the base web. The first and third regions are outside of the second region, the second region is larger in permeability than the first and third regions, and the second region and the first and third regions are formed of additional materials. Optionally, the at least one region is formed of an additive material at least partially comprising a filler. The additional material preferably evenly crosses the first and third regions.

28-33 illustrate a smoking article comprising such slit striped paper. In particular, FIG. 28 illustrates a smoking article having two striped zones 126, each comprising first and third regions of additional material 400 separated by second regions 404, which are gaps. Or in the form of reduced additional material regions. The first and third regions 400 and 402 of the additional material, respectively, have a width of about 2-5 mm, for example, and the second region has a width of about 1-2 mm, for example. More particularly, the first and third regions of the additional material 400, 402 each have a width of, for example, about 3 mm and the second region 404 has a width of about 1.5 to 2 mm, for example. . The first and third regions 400, 402 of the additional material preferably have multiple layers of additional material, for example two, three or four layers of additional material. The additional material is preferably uniform across the first and third regions 400, 402.

30 shows a smoking article with two striped zones 126, each of which is a first, third and third, in the form of a gap (see FIG. 31) or in the form of a reduced level of additional material (see FIG. 38). Five regions 410, 412, 414. The first, third and fifth regions of the additional material 410, 412, 414 are, for example, about 2 mm to 3 mm wide, and the second and fourth regions 416, 418 are wide, for example , About 1 mm to 2 mm, respectively. More preferably, the first, third, and fifth regions 410, 412, 414 of the additional material are each about 2 mm wide, for example, of the second and fourth regions 416, 418. The width is, for example, about 1 mm or less. The first, third and fifth regions 410, 412, 414 of the additional material preferably comprise multiple layers, for example two, three or four layers of additional material. The additional material is preferably uniform across the first, third or fifth regions 410, 412, 414.

FIG. 32 illustrates a smoking article having two striped zones 126, each of the first and third regions 420, 42 of additional material separated by a second region 424 with less additive material. It includes. The first and third regions of the additional material 420, 422 are each about 2 mm to 3 mm wide, for example, and the second region 424 with less additional material is about 1 mm to 2 mm wide, for example. to be. More preferably, the first and third regions 402 and 422 of the additional material are each about 3 mm wide, for example, and the second region 424 with less additional material is about 2 mm wide, for example. It is as follows. The first and third regions of the additional material 420, 422 preferably comprise multiple layers of additional material, for example two, three or four layers of additional material, while the second area is almost free of additional material. Includes, for example, one or two layers of additional materials. The additional material is preferably uniform across the first and third regions 420, 422. Although the second region 424 is operable at about 1 mm wide, implementations perform better at widths greater than 1.2 mm.

With reference to Figures 28-33, slit striped paper facilitates the use of less permeable wrapping paper for a given level of CO prior to the design of the striped paper. For example, tobacco rods with paper with 33 CORESTA permeability and 11 mg CO (FTC) delivery have found that 15 mg of CO (FTC) can be produced if the previous version of the stripe is applied without further change. To neutralize this increase, the permeability of the wrapper should increase to about 46 CORESTA. Such changes have many consequences, for example, in cigarette design, such as the number of puffs filled, the possible reduced processability of the paper, and the like. In contrast, slit striped paper with a permeability of 33 CORESTA gives 12 mg CO (FTC). Therefore, the slit stripes technique described herein facilitates the application of stripes that are less filled at the CO level (FTC).

With reference to FIGS. 34-37, further embodiments may include stripe regions in which regions extend longitudinally instead of circumferentially. More particularly, FIG. 34 corresponds to the stripe zone arrangement of FIG. 30 with longitudinally extending regions instead of circumference, and FIG. 36 corresponds to the stripe zone arrangement of FIG. 32 with longitudinally extending regions instead of circumference.

In a preferred embodiment, the first layer of each stripe zone is preferably formed using an aqueous barrier composition, which extends completely across the stripe zone. The continuous layer (s) of each striped region can be formed using the same aqueous film-forming composition or other aqueous composition. For example, the multilayers may all comprise exclusively starch containing layers or the multilayers may comprise (in any order) one or more layers exclusively containing starch and calcium carbonate. Can be. During gravure printing, the barrier composition may be heated to a temperature, wherein the viscosity preferably falls within the viscosity range suitable for gravure printing. When a heated barrier composition is applied, the barrier composition will be cooled or quenched and gelatinized. Therefore, some of the free water in the barrier composition will not be able to wet or move the fibers bound and underlying the underlying web. The binding of free water inhibits the formation of corrugations, wrinkles and / or wrinkles in the base web. The continuous layers of the stripe zones preferably have an increased thickness compared to the first layer. The stripe zone provides a reduction in permeability to the underlying underlying web, which preferably limits the air flow required to maintain combustion of cigarette coal in the neighborhood of the stripe zone.

The barrier composition used in the barrier composition may be selected from the group consisting of starch, alginate, carrageenin, guar gum, pectin and mixtures thereof. Preferably, the barrier composition is starch, more preferably oxidized starch such as, for example, topioca starch, more preferably oxidized topioca starch. In this embodiment, the barrier composition preferably does not contain fillers such as, for example, calcium carbonate, which increases the rate of combustion through the striped zone. In a preferred embodiment, the barrier composition used for printing comprises water and about 20 to about 50 weight percent barrier composition. If the concentration of the barrier composition in the composition is high, the composition is gelatinized when the temperature is rapidly reduced. Therefore, the free water combines into the printed striped area.

At room temperature (about 23 ° C.), the high-solid-content barrier composition has a viscosity of greater than about 20OmPa · S (centipoises (cP)) and is not suitable for gravure printing; However, at a temperature of about 40-90 ° C., the viscosity of the barrier composition is sufficiently reduced for use as a gravure printing composition. In the case of gravure printing, an upper limit of suitable viscosity is about 20 mPa · S. Most preferably, the barrier composition is about 100 mPa · s at a temperature in the range from 40 ° C. to 90 ° C., so that the composition can be quenched when contacted with paper after gravure printing at this temperature. The viscosity of the composition at room temperature is also important. High viscosity at room temperature is required for the barrier composition to be a gel at room temperature.

Preferably, the stripe area is applied to the wrapper using a continuous gravure printing process. The gravure printing process enables precise registration of continuous print jobs. Thus, gravure printing can be used to effectively print any continuous layers as well as the first layer of striped areas.

Example

The following examples are for illustrative purposes only, without limitation. Cigarettes with five different wrappers (ie, wrappers with five different striped zone arrangements) were tested for ignition propensity (“ignition propensity”) and self extinguishing at 0 ° (horizontal). The base web of each wrapper had a permeability of 33 CORESTA and a basis weight of 25 g / m ² .

Table X

* The numbers represent the width of the area in mm (see Table XI-XV below).

In Table X, Wrapping Paper A is a control with a continuous solid 6 mm printed striped area, with an added speed of 5.5 ×. The additional speed of 5.5X, as used herein, is brought additional material 8 g / m ² to about 9g / m ² on a dry weight basis, a 27mm (that is, until the leading edge of the next stripe zone from the leading edge of the banded zone for 6mm streaks zone with an interval) of the basic weight of 26.5g / m ² it was applied to the base web having a basis weight of 25g / m ^2.

Table XI-Details on Wrapping Paper B

Table XII-Details on Wrapping Paper C

Table XIII-Details on Wrapping Paper D

Table XIV-Details on Wrapping Paper E

In comparison to control wrapper A, wrapper B-E exhibits the desired decrease in self-extinguishing while maintaining the ignition propensity (ie, without a significant increase in the ignition propensity). In particular, wrapper B showed an improvement over the control wrapper, as evidenced by a reduction from 95 to 60% in self-extinguishing. Furthermore, comparing the wrappers B and D, it can be seen that by increasing the width of the second area from 1 mm to 2 mm, the self-extinguishing average was reduced from 60% to 25% (while maintaining the ignition tendency value approximately). Therefore, the width of the second region is preferably greater than 1 mm, preferably about 1.5 mm or about 2 mm. Good results were also seen in wrapper C, which exhibited a self-extinguishing average of 45%, with the best results being in wrapper E, with a self-extinguishing average of 20%.

It should be borne in mind that the wrapping paper E, which has the striped region comprising the first, second, third, fourth and fifth regions, and which shows the best results, has 1 mm second and fourth regions with greater transparency. In contrast, the wrapping paper B, which has only the first, second and third regions, and the 1 mm second region has greater permeability, was not performed well. Therefore, a wrapper having a stripe region comprising only first, second and third regions, has a larger permeable region of the wrapper having a stripe region comprising first, second, third, fourth and fifth regions. It has a wider area (ie about 1.5 mm or about 2 mm) with greater permeability.

Moreover, a method of making a striped wrapper of smoking articles may include supplying a base web and forming at least one horizontal stripe region including first, second, and third regions on the base web. The first and third regions are outside of the second region, the second region has greater permeability compared to the first and third regions, and at least the first and third regions are formed of additive material without filler. Optionally at least one region is formed of an additive material, at least in part comprising a filler. The additional material is preferably uniform across the first and third regions.

Moreover, a method of making a striped wrapper of smoking articles includes supplying a base web and forming at least one transverse stripe region comprising first, second and third regions over the base web. The first and third regions are outside the second region, the second region is more permeable than the first and third regions, and the second region and the first and third regions are formed of additional materials. Optionally, at least one of the regions is formed of an additional material at least partially comprising a filler. The additional material is preferably uniform across the first and third regions.

In a preferred embodiment, the first layer of each striped region is formed using an aqueous barrier composition, which extends completely across the striped region. The continuous layer (or layers) of each striped region can be formed using the same aqueous film-forming composition or other aqueous composition. For example, the multiple layers may all exclusively comprise layers containing starch, or the multiple layers may comprise (in any order) one or more layers exclusively containing starch and calcium carbonate. have. During gravure printing, the barrier composition is preferably heated to a temperature where the viscosity of the composition is in the viscosity range suitable for gravure printing. When the heated barrier composition is applied, the barrier composition will be cooled or quenched and gelatinized. Therefore, some of the free water in the barrier composition is unable to bind and absorb or migrate to the fibers underlying the underlying web. The binding of free water inhibits the formation of corrugations, wrinkles and / or wrinkles in the base web. Preferably the continuous layers of the base web have an increased thickness compared to the first layer. The striped region provides a reduction in permeability to the underlying underlying web, which preferably limits the air flow needed to support the combustion of cigarette coal in the neighborhood of the striped region. In an embodiment comprising a layer of additional material comprising calcium carbonate, the layer is preferably a top layer of stripe zones designed outside of or for wrapping of stripe zones or within the wrapper of stripe zones to maximize its good effect. So that it can be applied to the appearance of smoking articles.

The barrier composition of the striped zone may be selected from the group consisting of starch, alginate, carrageenin, guar gum, pectin and mixtures thereof. Preferably, the barrier composition comprises starch, more preferably oxidized starch, for example oxidized starch, more particularly oxidized topioca starch. In one embodiment, the barrier composition preferably does not contain fillers such as, for example, calcium carbonate, which will increase the rate of combustion through the striped zone. In a preferred embodiment, the barrier composition used for printing comprises water and about 20% to about 50% by weight barrier composition. If the concentration of the barrier composition in the composition is high, the composition will gelatinize when its temperature is rapidly lowered. Therefore, binding of free water to the printed striped area may occur.

At room temperature (about 23 ° C.), the high-solid-blocking composition has a viscosity in excess of about 200 mPa · s (centipoise (cP)) which is not suitable for the printing process; However, at temperatures between about 40 ° C. and about 90 ° C., the viscosity of the barrier composition is sufficiently reduced for use as a gravure printing composition. For gravure printing, an upper limit of suitable viscosity is about 20 mPa · S. Most preferably, the barrier composition has a viscosity of about 100 mPa · S at a temperature of about 40 ° C. to about 90 ° C. and the composition may be quenched in contact with paper after gravure printing at that temperature. Such barrier compositions will comprise 24% by weight starch. Optionally, the barrier composition may comprise 20% by weight of starch, the viscosity of which is about 10mPa.S to 40mPa.S at room temperature, and the viscosity at higher temperatures is low. The viscosity of the composition at room temperature is also important. High viscosity at room temperature is required for the barrier composition to be a gel at room temperature.

39 is a perspective view of a smoking article 120 having a striped region with an angulated slit 450. 40 is an exemplary representation of angled slits on an unfolded wrapper 140. FIG. 41 shows a smoking article 120 having a stripe zone 126 with one or optionally two longitudinal slits 460 shortly leading the leading edge 146 and trailing edge 148 of the stripe zone 126. Perspective view.

FIG. 42 is a side view of a smoking article that includes a stripe paper having striped areas with angled slits as shown in FIG. 39. However, in contrast to FIG. 39, the angled slit 450 is inclined in the opposite direction to the slit of FIG. 39. Another embodiment notes the use of columnar slits in both the circumferential and longitudinal directions (see FIG. 43).

Another embodiment notes the use of circumferential slits in both the circumferential and longitudinal directions (see FIG. 43). The resulting pattern of additional material is similar to spaced zones 126, with a number of pieces 460 therein.

In another embodiment, the vertical stripe zone 470 is wound spirally along the length of the smoking article 120 (see FIGS. 44-46). These spiral arrangements are well suited for common circular cigarettes. When the smoking article 120 experiences a pre-burned condition, the opposing spirally wound longitudinal stripe zones block air flow to the combustion coal of the tobacco rod due to their reduced permeability. However, the blocked portion of the wrapper allows the smoking article to have constant and advantageous conditions to maintain combustion in the advancing coal of the smoking article. On the other hand, a wide variety of situations occur when smoking articles are placed on a substrate. The substrate prevents the upward flow of air to the bottom of the tobacco rod. The opposing spirally wound longitudinal stripe zone and substrate cooperate to define a very small area in which air can be delivered to the base web as described above.

FIG. 44 shows a smoking article 120 preferably comprising a spiral longitudinal stripe region 470 extending the length of the wrapper. The circumferential width of these helical stripes 470 is preferably selected such that the helical band 470 covers less than about 33% of the surface area of the wrapper 123 surrounding the tobacco rod. The helix angle β (see FIG. 12) of the spiral longitudinal stripe region 470 is equal to the arc tangent (I / c), where I is the length of the tobacco rod and c is the circumference of the smoking article. By the starting portion of the spiral stripe zone 470 as shown in FIG. 44, the smoking article 120 is characterized by the diameter of the smoking article along which the spiral stripe strip 470 is parallel with the substrate when the smoking article is placed on the substrate during the test. It has one arrangement along the length with the opposite relationship.

Preferably, the helix angle β of the helical longitudinal stripe zone is chosen such that at least one position along the tobacco rod represents the arrangement shown in FIG. 12, irrespective of the rotational position about the longitudinal axis of the smoking article. More preferably, the helix angle β is between about arc tangent (2I / c) to about arc tangent, such that at least two positions along the tobacco rod represent the arrangement of FIG. 12, irrespective of the portion of rotation about the longitudinal axis of the smoking article. Selected to lie between (I / c). If desired, the helix angle β can be chosen to be smaller than the arc tangent (I / c) such that more occurrences of the FIG. 12 state occur throughout the length of the tobacco rod.

Such an embodiment preferably comprises at least one arrangement along its length, and preferably 2, 3, With four or more arrangements, the stripe zones in the cross section lie substantially parallel to the ends of the major dimensions of the cross section lying parallel with the underlying substrate, the cross section similar to FIG. 12. Preferably, the longitudinal stripe zone covers up to 25% of the surface area of the smoking article and / or has a width of up to about 6 mm in the circumferential direction. Preferably, each longitudinal stripe zone comprises sufficient additional material to reduce the permeability of the wrapper in each longitudinal stripe zone to about 0.0 to about 12 CORESTA, more preferably about 7 CORESTA or less.

As the angle β approaches zero, the stripe zone 126 becomes a vertical stripe 480 generally located parallel to the axis of the smoking article 120 (see FIG. 48).

The wrapper for smoking articles also includes a base web 40 having normal permeability (see FIG. 49) and a plurality of stripe zones 126 having sufficient additional material such that the wrapper has less permeability than the normal permeability of the base web in the stripe zone. do. The leading edge 500 of each stripe zone 126 will be a total eye pattern. Optionally, the trailing edge 502 of the stripe area can also be a total eye pattern.

While various arrangements of the general eye eye area may be conceived by those skilled in the art, such various arrangements are described in the accompanying drawings. For example (see FIG. 50), the stripe zone 12 may have a leading edge 500 with the total eye 504 lying between the protruding walls 506. In this embodiment, the protruding wall 506 has a size substantially equal to the size in the transverse direction of the gun eye 504 in the transverse size of the base web 140. As shown, the protruding wall 506 and associated gun eye 504 are generally rectangular. However, if desired, the protruding wall 506 and the eye 504 include, but are not limited to, other geometries, quadrilaterals, trapezoids, hexagons, and other regular or irregular geometries. The distance between the bottom of the gun eye 504 adjacent to the top of the protruding wall 506 falls in the range of about 2 mm to about 5 mm, preferably about 3 mm. At the trailing edge of the stripe zone 126, a similarly blind eye arrangement is also provided.

In FIG. 51, the protruding wall 524 of the leading edge 52 and part of the total eye 526 differ from the arrangement of FIG. 50. In FIG. 51, the protruding wall 524 has approximately half a transverse web dimension of the cross-web cross section of the associated eye 526. Nevertheless, an integral pair of protruding walls 524 and bullets 526 correspond to the nominal circumference of the smoking article, as described above. The height of the protruding wall 542, or the depth of the gun eye 526, is preferably in the range of values as discussed in relation to FIG. 59. At the trailing edge of the embodiment of FIG. 51, the cross sectional dimensions of trailing edge protrusion wall 530 and trailing edge total eye 528 are different from the cross sectional dimensions of leading edge protrusion wall and leading edge total eye.

In FIG. 52, the leading edge of the stripe zone 126 has substantially the same features as discussed above with respect to FIG. 50. However, the trailing edge 540 has a protruding wall 542 having a cross-sectional dimension that is substantially larger than the cross section of the opposing eye 504 of the leading edge, and the cross section of the trailing edge eye 544 is of the leading edge. It is substantially smaller than the cross-sectional dimension of the corresponding opposing protruding wall 506.

53 illustrates another embodiment of the broad-eyed striped zone in accordance with the present disclosure. In this implementation, the leading edge 500 will have the above characteristics associated with FIG. 50. However, in this embodiment, the trailing edge of the general eyelid area 126 may be straight.

Although the above embodiment describes the common notch shaped bayonet edges, the bayonet stripes 126 in FIG. 54 have a different shape than the bayonet edge 560. More particularly, the bayonet edge 560 has a substantially triangular protruding wall 506 separated by a substantially triangle bayonet 504. If desired, the trailing trailing edge 562 may be straight. However, preferably the trailing edge 562 of the stripe 126 may also have the triangular total eyelet arrangement described above with respect to the leading edge 80.

Similar to the bayonet stripe of FIG. 54, the bayonet stripe of FIG. 55 has a bayonet edge 80 having a substantially triangular protruding wall that is substantially separated by a triangular bullet. In contrast, the trailing trailing edge 562 is straight in FIG. 55, and the trailing trailing edge 562 also has the same triangular broad eye arrangement as the leading edge 560. As further described in FIG. 55, the stripes may be divided into two striped portions 564, 56 ′ spaced from each other by a “slit” 566. The slits 81 typically do not exceed the width of the individual stripe portions measured in a direction generally parallel to the axis of the striped smoking article. The spacing feature provides a “slit” 566 (or discontinuity) in the stripe structure with no or no additional material.

Figure 56 shows a broad eye stripe similar to Figure 55, but the stripe is divided into three stripe portions 564, 564 '564 "spaced from each other along the axis of the smoking article by pairs of slits 566, 568.

In the embodiment shown in FIG. 57, the stripes 126 have a different shape relative to the total fringe edge 560. In particular, the leading edge is the total eye pattern (ie, cut into rounded sectors). Sector 505 (ie, circular fragments or angled protrusions) may vary or be uniform in width and / or length. The trailing trailing edge 562 may be straight, total fringe (according to any of FIGS. 49-56) or rounded serrated. The circular serrated stripes of FIG. 57 may additionally include "slits" in the striped structure as shown in FIGS. 55-56. In addition, although not described, the stripe structure may comprise a total eye structure (ie, having an irregular waveform or serrated outline) and / or trailing edges, which stripe may optionally include one or more “slits”. It features.

The geometry of smoking article 120 may be designed to help achieve the desired placement for the purpose of reducing ignition propensity. For example, the opposing vertical stripe area 600 (see FIG. 58) may be positioned at an edge of the major axis of the substantially elliptical smoking article 120A, where the major axis of the substantially elliptical smoking article 120A is a smoking article. It naturally stops at a position substantially parallel to the laid substrate 260.

Such smoking article 120A is also known as an egg-shaped smoking article. The base web of the wrapper used in such an oval smoking article is preferably applied to the longitudinal stripe zone of the film forming compound (its constituents being the same as discussed elsewhere herein). These vertical stripe zones may be two parallel, vertical stripes extending longitudinally along a portion of the side of the smoking article. In other words, these stripes are applied to the base web so that when the paper wraps the tobacco rod, the stripes are some distance from each other. Smoking article 120 may include a longitudinally extending striped region (or stripe) that preferably extends the length of the wrapper or tobacco rod. Preferably, the striped zones face each other along the opposite side of the smoking article.

Due to the elliptical nature, regardless of how the egg-shaped smoking article is placed on the substrate, the smoking article 120A will stop at one of the two stable positions, with the upper or lower side stationary relative to the substrate. Therefore, if the longitudinal stripe region of the additional material is formed only along the side of a generally elliptical article of maximum curvature, the film forming compound will always be on the side that is not in contact with the substrate 260 of the smoking article 120A. Moreover, the bond between these longitudinal stripe zones and the substrate in a stable position restricts air flow to the tobacco rod and reduces self-extinguishing and low ignition, regardless of how the smoking article 120 is initially placed on the substrate 230. Appear as a function to get inclination.

Certain patterns of additional materials are typically applied to the base web with permeability in the range of about 20 to about 80 CORESTA units. Once dried, the additive material often forms a film on the base web that is effective to locally reduce permeability to values of 0 to about 12 CORESTA units, more preferably 0 to about 10 CORESTA units. In some applications, the additional material is applied as an aqueous solution comprising starch.

Printing process

Preferably, the striped zone is applied to the wrapper using a gravure printing process. The gravure print job enables precise registration of continuous print jobs. Thus, gravure printing can be used to effectively print any continuous layers, as well as the first layer of striped regions.

In a continuous gravure printing process, preferably after the first layer is applied to the base web, the first layer is advanced thereon prior to applying the second layer to the first layer using conventional continuous-pass gravure printing equipment. , Drying on it using a suitable arrangement. Preferably, the second layer is in the same space as the first layer in both width and length; However, the second layer may differ from the first layer in gram basis weights per square meter. The barrier composition of the second layer gels over the colder first layer-and the free water does not move or is absorbed by the paper. Preferably, the second layer is dried using a suitable arrangement prior to advancing to the continuous gravure print station (s) to which the continuous layer (s) are applied. Preferably, the continuous layer (s) are co-spaced in both width and length with the preceding layer (s) (ie, the layers do not have a layered appearance); However, the continuous layer (s) may have a gram basis weight per square meter that is different from the preceding layer (s). Preferably, the continuous layer (s) are dried after printing of each continuous layer, preferably according to known gravure printing and conventional gravure printing systems.

The gravure printing process can be used at the print station immediately following the papermaking process, ie at the location close to the end of the papermaking machine. Alternatively, a gravure printing process can be used in conjunction with a reel that carries the wrapping paper to which the stripe area is to be printed. For example, a reel of paper having a selected permeability and a selected basis weight is mounted such that the papers can be released from the reel as a continuous basic web.

The basic web advances or passes through the first gravure print station where the first layer of each striped zone is printed on paper. The printing process will be applied to the felt side or the wire side, or both sides of the paper. The wrapper then passes through a second gravure printing station where a second layer of each stripe area is printed on the corresponding first side. Additional layers are applied in a similar manner as described. Finally, the wrapper with the printed striped area is wound on a collection reel. The collecting reel is then cut into bobbins. Bobbins are then used in the manufacture of desired smoking articles in conventional tobacco rod makers.

The device at each gravure printing station is essentially identical in material. Therefore, it is sufficient to describe one of the gravure print stations in detail, and the other gravure print stations are understood to have common properties unless otherwise indicated. Single pass technology can be used to make striped paper instead of multi-pass technology.

In the first gravure printing station, the equipment includes a gravure cylinder or roller mounted for rotation about the horizontal axis. In general, the cylindrical surface of the roller is patterned in a process suitable for defining the negative of the first layer of the striped zone (ie, with dots, lines, cells, etc.). Conventional engraving (etching), chemical engraving, electrical engraving and photoetching can be used to pattern the surface of the gravure cylinder. The circumference of the roller is determined to be an integer multiple of the nominal distance between the stripe zones plus the stripe zone width. Therefore, the integer of the first layer of the stripe zone is printed on the paper in each rotation of the roller.

By gravure printing, each layer of additional material is applied uniformly, but each layer of additional material need not be applied uniformly. For example, a layer of additional material can be applied such that the discrete portions of the layer have a different basis weight than other regions of the layer. This can be done, for example, by printing the discrete portions of the layer having a basis weight different from the rest of the layer in a separate printing step using additional material having a different basis weight. Optionally, the layer of additional material may be applied such that the discrete portion of the layer has a different depth than the rest of the layer. This can be done, for example, by patterning a gravure cylinder or roller to provide a discrete portion of the layer having a different depth than the rest of the layer.

Multiple regions of the striped region described herein, for example, the first, second and third regions, can be applied in a single printing step or multiple printing steps. When applied in multiple printing steps, each area containing additional material can be applied in a separate printing step. For example, in the case of striped regions containing first, second and third regions, where only the first and third regions contain additional material, the first region is applied in the first printing step and the third The area can be applied in the second printing step. Optionally, when applied in a single printing step, the areas containing additional material are applied using suitably patterned gravure cylinders or rollers. For example, in the case of striped zones containing first, second and third zones, where only the first and third zones contain additional material, the gravure cylinder or roller is only added to the first and third zones. Patterned to apply the material.

The pressurized cylinder is mounted for counter-rotation on an axis parallel to the axis of the roller. In some applications, the pressurized cylinder includes a nonmetallic resilient surface. The pressurized cylinder is located between the roller and the backing roller, which is also mounted to rotate on an axis parallel to the axis of the roller and it is counter-rotated relative to the pressurized cylinder. One of the functions provided by the back roller is to harden the central portion of the pressure cylinder so that a uniform printing pressure is achieved between the roller and the pressure cylinder. Gravure cylinders or rollers and pressurized cylinders combine to define the nip to which the base web advances during the printing process. The nip is sized to hold the base web as it moves between the gravure cylinder and the pressure cylinder. Nip pressure on the base web ensures that the composition moves accurately from the cylinder to the paper.

The reservoir contains the barrier composition for forming striped areas on the wrapper. The reservoir is connected with a suitable pump capable of handling the viscous barrier composition. The barrier composition then flows to a suitable heat exchanger, where the temperature of the barrier composition is raised so that the viscosity of the barrier composition is in the range of about 40 to about 90 ° C., at which level is suitable for gravure printing. As above, the viscosity for gravure printing should be less than about 20OmPa · S (cP). Preferably, the temperature of the barrier composition is selected such that the viscosity is less than about 10 mPa · S. For example, the barrier composition may be between about 10 mPa · S and 40 mPa · S at room temperature.

Although individual heat exchangers have been described, it may be desirable to provide the reservoir itself with thermal conditioning of the barrier composition. For example, heating elements and stirring devices may be included in the reservoir to maintain the elevated temperature of the barrier composition. The placement of thermal conditioning in the reservoir is the operation of the pump selection and operating requirements requirements, since the barrier composition is already heated and therefore the viscosity is low, so the pump does not have to deal with the barrier composition at high viscosities associated with low temperatures. There is an advantage to simplifying. It is important that the thermal conditioning takes place in a reservoir or in a separate heat exchanger, at a temperature selected to prevent the thermal conditioning step from burning off the barrier composition. Burning can cause discoloration of the barrier composition and can affect the barrier properties of the composition. Therefore, burning should be avoided while the barrier composition is thermally conditioned.

Regardless of where the thermal conditioning step occurs, the heated barrier composition is delivered to an applicator that replenishes the barrier composition along the length of the gravure cylinder. The replenishment step may be performed by pouring or spraying the barrier composition into the gravure cylinder, or by simply delivering the liquid barrier composition to a bath of barrier composition that collects at the bottom of the gravure cylinder, between the gravure cylinder and the collector. have. The cylinder may be heated to prevent premature cooling of the composition.

Generally, the collector extends vertically to a height high enough to collect the bath around the gravure roller, but lower than the top of the gravure cylinder. When the bath reaches the top of the collector, the barrier composition can flow through the drain at the bottom of the device and return to the reservoir. Therefore, the barrier composition can be circulated through the printing station and maintained at a suitable printing viscosity by the thermal conditioning apparatus.

As the gravure cylinder rotates through the applicator and / or bath, the barrier composition adheres to the surface of the gravure cylinder, which is included to define the striped region in the shape provided therein. Further rotation toward the nip of the gravure cylinder moves the cylinder surface through the appropriate doctor blade. The doctor blade extends along the length of the cylinder and is positioned to wipe the surface of the gravure cylinder. In this way, the position of the gravure cylinder, which defines the minimum spacing between neighboring striped regions, essentially wipes off the barrier composition, whereas the carved portion of the gravure cylinder defining the striped region fills the nip of the barrier composition. Move forward.

As the surface of the wrapper and gravure cylinder moves through the nip, the barrier composition moves to the surface of the wrapper. The linear velocity or speed of the wrapper coincides with the tangential surface speed of both the gravure cylinder and the pressurized cylinder as the wrapper passes through the nip. In this way, slippage and / or bleeding of the barrier composition on the wrapper is prevented.

The thickness of the multilayer stripe zone is preferably less than about 20% of the base web thickness, and may be less than 5% of the base web thickness. The thickness of the first layer of the stripe zone applied to the first gravure printing station is preferably less than 4% of the base web thickness and less than 1% of the base web thickness. Therefore, the thickness of the first layer appears to be thin compared to the thickness of the underlying web.

59 is a schematic diagram of a multi-step printing apparatus. Referring to the above description of multi-step printing, FIG. 59 shows a reel 600, a first gravure printing station 602, a second gravure printing station 604, a third gravure printing station 606, a collection reel 608, Roller 610, pressure cylinder 612, back roller 614, nip 616, reservoir 618, pump 620, heat exchanger 622, applicator 624, bath 626, collector ( 627, the drain pipe 628, the doctor blade 630, the adjustment cylinder 632, and the idler roller 634 will be described. In FIG. 59, the first gravure printing station 602 contains a reference number with the subscript "a", and the corresponding feature of the second gravure printing station 604 has the same reference number with the subscript "b", Corresponding features of the third gravure printing station 606 have the same reference number with the subscript “c”.

As an alternative to printing, the striped zone may be a slurry of highly fine fibrous cellulose (eg, fibers, microfibers, micromicrofibers, or combinations thereof) or US 5 997, the entire contents of which are incorporated herein by reference. Other additive materials applied using various spraying or coating techniques, including application techniques using a moving applicator in the forming compartment of a paper-making machine as described in 691 and US 6 596 125.

When the word "about" is used herein with reference to numbers, it means not only numbers but within ± 10% of the exact number associated with the word or "about". Moreover, if references are expressed as percentages in this specification, these percentages are by weight, meaning weight percent. The terms and phrases used herein are not to be interpreted with mathematical or geometrical precision, but rather the geometrical terms should be construed in close or similar meanings to the geometrical terms and concepts. Terms such as "generally" and "substantially" are meant to include all the exact meanings of the relevant terms and concepts as well as to provide reasonable limits consistent with the form, function and / or meaning.

Those skilled in the art will understand that this disclosure describes new, useful and obscure smoking articles. Those skilled in the art will also understand that there are many variations, modifications, substitutions, and equivalents for the various aspects of smoking articles described in the detailed description above. Accordingly, it is obvious that all changes, modifications, substitutions and equivalents belonging to the meaning and scope of the present invention are included in the present invention according to the definition of the appended claims.

Claims (89)

A base web having a longitudinal direction and a horizontal direction; And Containing additional materials applied as a starch aqueous solution in a pattern to the underlying web, The wrapper for smoking article wherein the additional material comprises an anti-wrinkle agent. The wrapper of claim 1 wherein the anti-wrinkle agent can mitigate shrinkage of the base web during drying. The wrapper of claim 2 wherein the anti-wrinkle agent weakens shrinkage of the base web in the transverse direction. The method of claim 1, wherein the anti-wrinkle agent is selected from propylene glycol; 1,2-propylene glycol; And glycerin. The wrapping paper of claim 4 wherein the anti-wrinkle agent is propylene glycol. 6. The wrapper of claim 5 wherein the anti-wrinkle agent is 1,2-propylene glycol. The wrapping paper of claim 4 wherein the anti-wrinkle agent is glycerin. The wrapping paper of claim 1, wherein the pattern comprises a plurality of striped regions that extend horizontally along the wrapping paper and are spaced vertically. 9. The stripe zone of claim 8, wherein the stripe zone has a leading edge and a trailing edge, the stripe zone such that the leading edge and trailing edge receive the additional material at a first application rate and Wrapping paper applied to the base web such that there are less applied areas than the leading and trailing edges. 10. The wrapper of claim 9 wherein the region extends transversely of the base web and does not receive additional material. 10. The wrapper of claim 9 wherein the region extends longitudinally of the base web and does not receive additional material. 10. The wrapping paper of claim 9, wherein the region extends both in the longitudinal direction of the base web and in the width of the base web. 9. The wrapper of claim 8, wherein the striped region extends at an angle greater than 0 degrees and less than 90 degrees. 10. The wrapper of claim 8 wherein the striped region includes a wavy edge. 9. The wrapper of claim 8, wherein the stripe zone includes edges of the total eye pattern. 10. The wrapper of claim 8 wherein said striped region includes a sawtooth edge. The wrapper of claim 1 wherein the pattern comprises a row of pieces extending horizontally and vertically over the base web. 18. The wrapper of claim 17 wherein the rows of pieces comprise a plurality of substantially similar geometric shapes. 19. The wrapping paper of claim 18, wherein the geometry is a substantially quadrilateral shape. 19. The wrapping paper of claim 18, wherein the geometric shape is substantially triangular in shape. The wrapper of claim 1 wherein the additive material is applied in a single layer. The wrapper of claim 1 wherein the additional material is applied in at least two layers. 23. The wrapper of claim 22 wherein the additive material has one layer comprising calcium carbonate. 24. The wrapper of claim 23 wherein an additive material containing calcium carbonate is applied to the base web and an additional material substantially free of calcium carbonate is applied to the calcium carbonate containing additive material. The wrapper of claim 1 wherein the additional material is applied to the base web by printing. The wrapper of claim 1 wherein the base web has a permeability greater than about 20 CORESTA. 27. The wrapper of claim 26 wherein the base web has a permeability of less than about 100 CORESTA. A smoking article having desirable ignition propensity characteristics, A large amount of tobacco; Wrapping paper surrounding a large amount of tobacco and defining a tobacco rod; And And an additional material applied in a pattern to the wrapping paper, wherein the additional material is applied as an aqueous solution of starch containing an anti-wrinkle agent. 29. A smoking article according to claim 28, wherein the tobacco rod has an oral end and a filter is attached to the oral end. A smoking article according to claim 28 having an ignition propensity value of less than about 25. A smoking article according to claim 28 having a self extinguishing value of less than about 50. A smoking article according to claim 28 having an ignition propensity value of less than about 25 and a self extinguishing value of less than about 50. 29. The method of claim 28, wherein the anti-wrinkle agent is selected from propylene glycol; 1,2-propylene glycol; And glycerin. The smoking article of claim 33, wherein the anti-wrinkle agent is propylene glycol. The smoking article of claim 34, wherein the anti-wrinkle agent is 1,2-propylene glycol. 35. A smoking article according to claim 34, wherein said anti-wrinkle agent is glycerin. 29. The tobacco rod of claim 28 wherein the tobacco rod comprises an ignition end and the pattern comprises at least two stripe regions spaced longitudinally by stripes having a spacing of about 12 mm extending circumferentially around the tobacco rod. Smoking goods. 29. The system of claim 28, wherein the stripe zones are circumferential and include leading and trailing edges and the stripe zones allow the leading and trailing edges to receive additional material at a first application rate and the additional material to lead and trail. Smoking article applied to the underlying web such that there is an area applied less than the ring edge. The smoking article of claim 38, wherein the region extends circumferentially around the tobacco rod and does not receive additional material. The smoking article of claim 39, wherein the region extends longitudinally of the tobacco rod and does not receive additional material. The smoking article of claim 39, wherein the region extends in both the longitudinal of the tobacco rod and the transverse of the tobacco rod. 39. A smoking article according to claim 38, wherein the striped zone surrounds the tobacco rod spiral. The smoking article of claim 38, wherein the striped region comprises a wavy edge. 39. A smoking article according to claim 38, wherein the striped zone comprises an edge of the general eye pattern. 39. A smoking article according to claim 38, wherein the striped zone generally comprises a sawtooth shaped edge. The smoking article of claim 28, wherein the pattern comprises a row of circumferentially and longitudinally extending pieces along the tobacco rod. The smoking article of claim 46, wherein the rows of pieces comprise a plurality of geometric entities that are substantially similar. 48. A smoking article according to claim 47, wherein the geometrical entities are substantially quadrilateral. 48. A smoking article according to claim 47, wherein the geometrical objects are substantially triangular objects. 29. A smoking article according to claim 28, wherein said additional material is applied in a single layer. 29. A smoking article according to claim 28, wherein said additional material is applied in at least two layers. 29. A smoking article according to claim 28, wherein the additional material has one layer comprising calcium carbonate. 29. A smoking article according to claim 28, wherein the additive material containing calcium carbonate is applied to the base web of the wrapping paper, and the additional material substantially free of calcium carbonate is applied to the additive material containing calcium carbonate. 29. A smoking article according to claim 28, wherein the additional material is applied to the base web by printing. The smoking article of claim 28, wherein the base web has a permeability greater than about 20 CORESTA. The smoking article of claim 28, wherein the base web has a permeability of less than about 100 CORESTA. The smoking article of claim 28, wherein the pattern comprises a first plurality of pieces and a second plurality of pieces aligned along a spiral path around the tobacco rod. 58. A smoking article according to claim 57, wherein the tobacco rod has an axis and the first plurality of pieces are symmetrically spaced from the corresponding second plurality of pieces relative to the tobacco rod axis. The method of claim 58, Each of the first plurality of pieces is symmetrically spaced from the corresponding second plurality of pieces relative to the axis of the tobacco rod; When the smoking article is placed on a substrate that substantially blocks air flow to the smoking article near the first side of the smoking article, none of the first plurality of pieces and the second plurality of pieces are in the first longitudinal position of the smoking article. Not positioned to be in contact with the substrate, the smoking article is self-extinguishing when the advancing combustion line reaches the first longitudinal position; And When the smoking article is not supported by the substrate, the advancing combustion line is not self-extinguishing in the first longitudinal position. The smoking article according to claim 28, wherein the tobacco rod has a non-circular cross section. A wrapper for smoking articles comprising a base web and a plurality of zones above the base web to which the additive material is applied, the additive material comprising: starch of about 1.5 g / m ² ; And from about 0.36 g / m ² to about 0.90 g / m ² 1,2 propylene glycol. 62. The wrapper of claim 61 wherein the additional material further comprises 0.64 g / m ² to about 1.2 g / m ² calcium carbonate. 62. The wrapper of claim 61 wherein the base web has a transverse direction and the plurality of zones comprise stripes extending transversely. 64. The wrapper of claim 63 wherein the transversely extending stripes comprise substantially parallel edges, wherein the additional material is thicker at substantially parallel edges than in the middle region between the parallel edges. 64. The wrapper of claim 63 wherein the transversely extending stripes comprise substantially parallel edges, wherein the additional material is applied substantially uniformly between the parallel edges. A smoking article comprising a tobacco rod having a wrapper surrounding a quantity of tobacco, the wrapper extending circumferentially around the tobacco rod and having about 1.5 g / m ² starch and about 0.36 g / m ² to about 0.90 g / Smoking article comprising at least one striped zone comprising m ² propylene glycol. The smoking article of claim 66, wherein the striped zone further comprises about 0.64 g / m ² to about 1.2 g / m ² calcium carbonate. 67. The smoking article of claim 66, wherein the striped region has an edge and a region between the edges, and the combination of starch and propylene glycol is thicker at the edge than in the region between the edges. The smoking article of claim 68, wherein the striped zone comprises between about 0.64 g / m ² and about 1.2 g / m ² of calcium carbonate. In the manufacturing method of wrapping paper for smoking articles, Providing a basic web having a longitudinal direction and a horizontal direction; Applying to the base web a plurality of striped regions extending in the transverse direction of the additive material by depositing a first layer of aqueous solution containing starch, propylene glycol and calcium carbonate at a rate of about 4X; Drying the first layer; Precipitating a second layer of an aqueous solution containing starch, propylene glycol, and calcium carbonate on the first layer at a rate of about 3.5X; Drying the second layer; Precipitating a third layer of an aqueous solution containing starch and propylene glycol on the other layers at a rate of about 3X; And Method of manufacturing a wrapper comprising the step of drying the third layer. 71. The method of claim 70 wherein the first, second and third layers are deposited substantially uniformly in the striped zone. 71. The method of claim 70 wherein at least one of the layers is deposited in longitudinally spaced portions on the base web in the stripe zones. A smoking article comprising packaging paper made according to the method of claim 70. A smoking article comprising packaging paper made according to the method of claim 71. A smoking article comprising the wrapping paper made according to the method of claim 72. Method for producing a patterned wrapping paper, Providing a printing station with a supply of starch addition aqueous solution containing anti-wrinkle agent; And Passing the base web through the print station while applying the pattern of the additive solution to the base web at the print station. A method of making a smoking article having an ignition tendency of 25% or less, the smoking article comprising a wrapping paper, the method comprising: Applying additional material to pairs of areas facing away from the spaced spaces of the wrapper; Horizontally offsetting pairs of neighboring regions from each other such that the pair of regions of every three or more consecutive regions are offset from each other; Providing a sufficient size and amount of additional material to the pair of regions such that a smoking article is likely to be extinguished in one of the zones upon smoking on the substrate; And And wherein the smoking article comprises providing sufficient space between each pair of regions in each zone to continue smoke generation without self-extinguishment if the smoke occurs away from the substrate. Packing of smoking articles: Basic web; An additional material that is applied as a film forming aqueous solution in a pattern to the base web, whereby the ignition propensity of the smoking article is reduced, the film forming aqueous solution being capable of shrinking the base web when applied to the base web; And Wrapping paper comprising an anti-wrinkle agent present in the pattern in an amount sufficient to counteract the shrinkage of the film forming solution so that the occurrence of gaps in smoking articles produced with the wrapping paper is reduced. 79. The wrapper of claim 78 wherein the anti-wrinkle agent is selected from the group consisting of glycerin, propylene glycol, and 1,2-propylene glycol. 80. The wrapper of claim 79 wherein the film forming solution comprises starch. 81. The wrapper of claim 80 wherein the anti-wrinkle agent comprises 1,2-propylene glycol. 82. The wrapping paper of claim 81, wherein said film forming solution further comprises calcium carbonate. 81. The wrapper of claim 80 wherein the 1,2-propylene glycol is present in the pattern at about 0.36 g / m ² to about 0.90 g / m ² . A smoking article comprising a tobacco rod, wherein the tobacco rod has a wrapper comprising: Basic web; An additional material that is applied to the base web as a film forming aqueous solution in a pattern, thereby reducing the tendency to ignite the smoking article, wherein the film forming aqueous solution is capable of shrinking the base web when applied to the base web; And And an anti-wrinkle agent present in the pattern in an amount sufficient to counteract the shrinking ability of the film forming solution so that the occurrence of gaps in the smoking article produced from the wrapper is reduced. 85. The smoking article according to claim 84, wherein said anti-wrinkle agent is selected from the group consisting of glycerin, propylene glycol, and 1,2-propylene glycol. 86. The wrapper of claim 85 wherein the film forming solution comprises starch. 87. The wrapper of claim 86 wherein the anti-wrinkle agent comprises 1,2 propylene glycol. 88. The wrapper of claim 87 wherein the film forming solution further comprises calcium carbonate. 87. The wrapper of claim 86 wherein the 1,2 propylene glycol is present in the pattern in the range of about 0.36 g / m ² to about 0.90 g / m ² .

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