TW201534785A - Tipping paper for smoking article and smoking article using the same - Google Patents

Abstract

The present invention provides a novel tipping paper having good tactile feeling when being contacted by smokers, and overcoming restriction in manufacture. Specifically, the present invention provides a tipping paper for smoking article containing nanofiber.

Description

Outer paper for smoking articles and smoking articles using the outer paper

The present invention relates to an outer layer paper for a smoking article and a smoking article for using an outer layer paper for the smoking article.

The filter paper cigarette itself, which is a smoking article, can be used to connect and wind the shredded tobacco and the filter constituting the cigarette. It is known that the outer layer paper has a function of adjusting the amount of air sucked by the smoker and adjusting the smoke odor by appropriately providing an opening (ventilation hole) thereon (for example, Patent Document 1). As far as the material of the outer paper is concerned, pulp has been widely used in the past.

On the other hand, in recent years, the development of technology for nanofibers has become active, and it has been expected to be applied to regenerative medicine, life sciences, and optoelectronics engineering. As a method for producing such nanofibers, an electrospinning method is known. A technique of incorporating a nanofiber produced by an electrospinning method and adding a fragrance or the like into a filter element of a smoking article, thereby improving the flavor of a cigarette of a smoking article perceived by a smoker (for example, Patent Document 2) ).

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Japanese Laid-Open Patent Publication No. 2012-147719

[Patent Document 2] Japanese Patent Publication No. 2009-545307

The outer paper is placed in the part of the smoker when it is used in a cigarette-like smoking article, so that the smoker feels good about it. Daolin paper, which has been used in the past as a raw material for pulp, has also been tried to improve the smoothness of the skin of smokers, but the test has its limits. In general, a method for improving the smoothness of paper is also a method of applying a certain coating agent (a mixture of mineral powder and an adhesive) on the outer paper composed of the paper. However, the material constituting the smoking article is limited to a material which is not absorbed by the inside/inner body from the viewpoint of product warranty, and which does not cause health doubt if it is absorbed. Moreover, the material constituting the smoking article is limited to a material that does not affect the odor of the smoke. Further, as for the outer layer paper, if the paper powder is generated when the smoking article is manufactured, it is not appropriate, and thus it is necessary to have a certain degree. The manufacturing limit of tensile strength.

From these circumstances, it is difficult to completely satisfy the above-mentioned conditions required for the outer paper by merely improving the general use of the paper.

Accordingly, an object of the present invention is to provide an outer layer paper for a smoking article which is excellent in touch when a smoker comes into contact and which overcomes the limitation of manufacture.

The inventors of the present invention conducted a review and found out that the outer layer paper containing nanofibers can solve the above problems, and completed the present invention.

That is, the present invention is as follows.

<1> An outer layer paper for smoking articles containing nanofibers.

<2> The outer layer paper for smoking articles according to <1>, wherein the outer layer paper is composed only of a layer containing nanofibers.

<3> The outer layer paper for a smoking article according to <1>, which is an outer layer paper for a smoking article, wherein the outer layer paper has two or more layers, and at least one layer is a layer containing a nanofiber.

The outer layer paper for smoking articles according to any one of the above aspects, wherein the nanofibers have an average fiber diameter of 5 to 800 nm.

The outer layer paper for a smoking article according to any one of the above aspects, wherein the outer layer of the outer layer paper containing the nanofiber has a smoothness of 300 seconds or more.

<6> The outer layer paper for smoking articles according to any one of <1> to <5> wherein the outer layer paper has a tensile strength of 0.5 Newtons/mm or more.

<7> The outer layer paper for smoking articles according to any one of <1> to <6> wherein the layer containing the nanofibers constituting the outer layer paper does not contain an adhesive.

The outer layer paper for smoking articles of any one of <1> to <7> which is a plant fiber, synthetic fiber, semi-synthetic fiber, regenerated fiber, carbon fiber, inorganic substance, or These composite materials are constructed.

The outer layer paper for smoking articles according to any one of <1> to <7> wherein the nanofiber is made of calcium carbonate, cellulose, acetate, cotton, poly(meth)acrylate. , polyethylene, polypropylene, polyvinyl chloride, polystyrene A olefin, polyvinyl acetate, polyamide, polyurethane or a composite of these.

<10> A smoking article, which is the outer paper for smoking articles described in any one of <1> to <9>.

According to the present invention, since the outer layer paper contains nanofibers, the smoothness is high, so that the feeling of giving the smoker is good and the appearance is high. Further, in the outer layer paper which used pulp as a material in the past, an additive such as a coating agent containing an adhesive is required in order to improve the smoothness, but an outer layer paper can be produced without using such an additive. Therefore, there is no restriction on manufacturing.

1‧‧‧ cut tobacco

2‧‧‧Roll paper

3‧‧‧ Charcoal section filter tow

4‧‧‧ Plain section filter tow

5‧‧‧ outer paper

6‧‧‧ molding paper

7‧‧‧material paper

8‧‧‧Parts of tobacco containing tobacco

9‧‧‧ Filter section

10‧‧‧ Charcoal section (including material paper)

11‧‧‧ plain section (including material paper)

12‧‧‧Nano fiber sheets (Examples 1 and 2)

Fig. 1 is a schematic view showing a procedure for producing a test cigarette using the outer layer paper for a smoking article of the present invention.

In the following, the present invention is not limited to the embodiments and the examples, and the present invention is not limited to the embodiments and the examples, and the invention can be carried out without departing from the scope of the invention.

<nano fiber>

In the present invention, the diameter D of the nanofiber system is 1 μm or less, and when the length in the long axis direction is L, the L/D>100 is satisfied. By satisfying this kind of L/D, it is helpful to improve the smoothness of the layer composed of nanofibers, and Improve the feel of smokers. It also gives a high-grade look.

The average fiber diameter of the nanofibers is usually 5 nm or less, may be 50 nm or more, or may be 100 nm or more. Further, the upper limit of the average fiber diameter is usually 800 nm or less, and may be 500 nm or less.

Further, the average fiber length is usually 3,000 μm or less.

The average fiber length may be 1000 μm or less, or may be 300 μm or less.

Further, the average fiber length may be 10 μm or more, and may be 100 μm or more.

Further, in the present invention, the average fiber diameter and the average fiber length are values calculated from the fiber diameter (n=20) and the fiber length (n=20 or so) measured by an electron micrograph.

The nanofibers used in the present invention do not actually contain fibers having an average fiber diameter of a micron size.

The method for producing the nanofiber used in the present invention is not particularly limited, and a known method can be used.

Examples of such a production method include a polymer alternating fiber method for producing a nanofiber in which a fiber is a filament type (long fiber), a peeling type composite spinning method, and a modified conventional spinning method. Method, super-stretch spinning method, laser stretching method, or melt flow method (jet spinning method), flash spinning method, sputum method for producing scattered (short fiber) nanofibers (Mechanical defibration), mixed spinning method, tuck spinning, foaming sheet method (blasting method), bacterial method, metal core hydrocarbon high temperature heating method, mold casting method, electrospinning method.

The nanofiber used in the present invention is produced by, for example, an electrospinning method (electrospinning method), and is preferable from the viewpoint of versatility.

In the above description, a method of applying a high voltage to a liquid to be spun to be spun, the electrospinning method is known in the past, and the excretion liquid is divided into extremely fine fibers by electric mutual repulsion. A method of being spit out to form a nanofiber.

In this method, a polymer is used as a raw material for constituting the nanofiber, and the polymer is dissolved in a solvent to form a solution, and a predetermined amount of the solution is supplied from the needle or the like while being applied between the tip end portion of the needle and the fiber collecting portion. An electric field of tens of kV is used to form fibers.

The nanofiber used in the electrospinning method may, for example, be polystyrene, polycarbonate, poly(meth)acrylate, polyvinyl chloride, polyethylene terephthalate or nylon-6. 6, nylon-4, 6-like thermoplastic resin, polyurethane, polyvinyl alcohol, polylactic acid, polycaprolactone, polyethylene glycol, polyethylene-vinyl acetate copolymer, polyethylene-vinyl alcohol copolymer, Polyethylene oxide, collagen-like biodegradable polymer, polyacrylonitrile, polyamine, polyaniline, para-aramid, polyvinyl acetate, acetonitrile (acetate), the above polymer A synthetic fiber composed of a mixture of synthetic resins.

The weight average molecular weight of the polymer is not particularly limited as long as it can be fiberized by electrospinning. For example, a polymer having a weight average molecular weight of from 100,000 to 10,000,000, preferably from 100,000 to 1,000,000, can be used. In addition, when the molecular weight is low and the cellulose cannot be nanofiberized, the nanofiber can be made by mixing other polymers suitable for nanofibrillation. Chemical.

The concentration of the polymer in the solvent when the polymer is dissolved in a solvent at the time of spinning by the electrospinning method is not particularly limited, but if the polymer is not completely dissolved in the solvent, fibers are not easily obtained, and thus it is generally It is 2 to 20% by weight.

Further, the nanofiber may be a single inorganic material or a composite material composed of both an organic material and an inorganic material in addition to the polymer of the organic substance as described above.

Examples of the composite material of the organic substance and the inorganic substance include a combination of polyvinyl alcohol/SiO ₂ , nylon 6/kaolinite, polyacrylonitrile/TiO ₂ , polycaprolactone/ZnO, polycaprolactone/CaCO ₃ , and the like.

When it is a composite material of an organic substance and an inorganic substance, the ratio (volume ratio) of the content of the organic substance and the inorganic substance is not limited in the range of fibrillation, but if it is a nanofiber, the inorganic substance is dispersed in a nanometer order, so that it is easy The effect of obtaining the mixing is, for example, 99.9; 0.1 to 90:10.

In order to produce a nanofiber composed of an inorganic material, when the nanofiber to be formed is a metal oxide such as cerium oxide, aluminum oxide or zirconia, it is exemplified to prepare a cerium oxide nanoparticle which is, for example, used as a raw material. a solution in which particles or cerium oxide sol, alumina nanoparticle or alumina sol, zirconia nanoparticle or zirconia sol are dispersed, and is spun by an electrospinning method under an electric field of, for example, a voltage of about 20 kV. method.

When the nanofiber composed of the inorganic material is a metal hydroxide such as copper hydroxide or zinc hydroxide, it can be obtained by adding a strong alkali such as sodium hydroxide, ammonia or ethanolamine to the nitrate of copper or zinc. A nanofiber composed of a metal hydroxide such as Cu(OH) ₂ or Zn(OH) ₂ .

The nanofiber constituting the outer layer paper of the present invention may be exemplified by a plant fiber. As the plant fiber, for example, cotton can be exemplified. As a specific example of the method of using cotton as a nanofiber, a manufacturing method of mechanical defibration can be used, for example.

The semi-synthetic fiber can be exemplified as the nanofiber constituting the outer layer paper of the present invention. Specific examples of the semisynthetic fibers include acetate fibers produced by the production method of the electrospinning method.

The nanofiber constituting the outer layer paper of the present invention may, for example, be a recycled fiber. Specific examples of the regenerated fiber include copper-ammonia fibers produced by a method for producing a wet spinning, and specific examples of the method for nanofibrillation include, for example, mechanical defibration of fibers that have been subjected to spinning.

The nanofiber constituting the outer layer paper of the present invention may, for example, be carbon fiber (carbon nanofiber). Specific examples of the method for producing the carbon fiber include a method of firing an acrylic nanofiber produced by an electrospinning method.

The solvent which dissolves the material constituting the above-mentioned nanofibers may, for example, be acetone, acetonitrile, carbon tetrachloride, chloroform, cyclohexane, 1,2-dichloroethane, dichloromethane, diethyl ether or dimethyl. Mercaptoamine, dimethyl azine, 1,4-two Alkane, ethanol, ethyl acetate, heptane, hexane, methanol, methyl tertiary butyl ether, pentane, 1-propanol, 2-propanol, tetrahydrofuran, toluene, 2,2,4-trimethyl a combination of pentane, water, benzene, butanol, methyl ethyl ketone, N-methylpyrrolidine, dimethyl acetamide, formic acid, acetic acid, citric acid, and the like, and may be made from materials which are dissolved Appropriate choice.

The outer paper of the present invention contains the above nanofibers. on The form contained therein may be exemplified by a state in which the outer layer paper is entirely composed of nanofibers, or a layer composed of other constituent materials in addition to a layer composed of nanofibers. The form of the. Further, in addition to the nanofibers, other materials such as pulp which forms the outer layer paper may be contained in a small amount. In terms of its proportion, the proportion of other materials in the outer paper may be exemplified by less than 0.5% by weight. At this time, the proportion of the nanofibers in the outer layer paper is 99.5% by weight or more.

In the method for producing an outer layer paper, the nanofibers may be deposited on a substrate as a substrate to be an outer layer paper, or a sheet obtained by separately forming a layer of the nanofibers may be used as an outer layer paper without using a substrate. .

The type of the substrate can be used without particular limitation. When a two-layer structure obtained by laminating nanofibers on a forest paper is used, it is possible to use, for example, polypropylene or the like in addition to the forest paper. A substrate composed of a non-breathable resin or the like.

In this case, the substrate composed of the layer containing the nanofibers and the material other than the above may be bonded by electrostatic force, van der Waals force or partial welding without using an adhesive.

Further, in addition to the layer composed of the nanofibers, the layer composed of the other constituent material on the side opposite to the side in contact with the smoker may be a condition satisfying the above air permeability and having two or more layers. The outer layer of the structure. The outer layer paper having such a two-layer structure may be a layer in which the surface contacted by the smoker is a layer composed of nanofibers, and a surface in contact with the opposite side is a layer composed of a paper.

When the outer paper has a structure of two or more layers, the layer that the smoker contacts is a layer containing nanofibers, and the other layer contains a layer composed of a material different from the nanofiber. In this manner, the other layers may be composed only of a layer composed of a material different from the nanofibers, and may also include a layer comprising nanofibers.

In order to laminate the nanofibers, it is also possible to pass through a pulverization step for pulverizing the nanofibers which have been previously spun, or a papermaking step for papermaking.

Further, the obtained outer layer paper can be appropriately pressed to adjust the thickness and the like.

The thickness of the outer layer paper is usually from 10 to 50 μm.

The outer layer paper composed only of a single layer containing nanofibers is usually 10 to 50 μm.

When forming a paper or other paper and a plurality of layers, the ratio of the thickness of the layer containing the nanofibers to the thickness of the entire outer paper is usually 10 to 50%.

When the layer (nanofiber sheet) composed of the nanofiber of the present invention is produced, it is not necessary to use an additive such as an adhesive which is used when producing an outer layer paper composed of paper used in the past, such as Daolin paper. .

Further, in the outer layer paper of the present invention, the content of the above-defined nanofibers in the layer constituting the surface in contact with the smoker is usually from 50 to 100% by weight, preferably from 90 to 100% by weight.

The ratio of the nanofibers in the layer of the outer paper having the surface in contact with the smoker can be appropriately adjusted by adjusting the diameter or length of the nanofiber to be produced when producing a layer composed of nanofibers.

The diameter or length of the nanofiber can be, for example, an electrospinning method. It is adjusted by adjusting the material concentration of the solution in which the constituent material of the above-mentioned nanofiber is dissolved, the viscosity of the solution, or the applied voltage.

Further, the shape thereof is, for the outer layer paper of the smoking article, a square shape which is generally used, and the size may be 30 to 50 mm in length and 10 to 40 mm in width.

In the outer layer paper of the present invention, a vent hole for adjusting the ratio of the mainstream smoke of the cigarette smoked by the smoking article to the air may be provided. The arrangement of the vent holes is not particularly limited, and may be exemplified in a manner of forming one row or two columns in the circumferential direction of the smoking article. Further, the method of the pitch of the vent holes or the size of the holes and the method of opening the holes is not particularly limited. The outer paper of the present invention comprises both an aperture and an aperture.

The air permeability of the outer layer paper before the opening is preferably 5 CU (Coresta Unit) or less. Further, the so-called air permeability of the present invention is determined in accordance with ISO 2965-1997. The present invention refers to a so-called air permeability of the gas permeable Suo ‧1cm ² per 1 minute of air under pressure from one side of the paper 1kPa (2cm ²⁾ by (through) the air flow.

When the air permeability of the outer layer paper before the opening is 5 CU or less, the airtightness of the outer paper can be ensured, and the air can be prevented from flowing into the filter portion uncontrolled from the entire portion via the outer paper.

The air permeability can be adjusted by adjusting the density/basis weight of the nanofiber when the outer paper is only a layer composed of nanofibers, and when the outer paper has a structure of two or more layers, the nanofiber can be similarly used. In addition to the layer adjustment, it can also be adjusted by appropriately adjusting the material including the layer other than the layer of the nanofiber. Also, it is also possible to combine them to adjust.

In addition, the air permeability of the outer layer paper in the present invention is determined not to include the above The value of the portion of the opening of the venting hole.

In order to prevent the smoking article from being broken at the time of production due to the force applied when rolled up, the tensile strength of the outer layer paper of the present invention is preferably 0.5 N/mm or more.

The tensile strength can be adjusted by the material of the nanofiber of the outer layer paper, the basis weight, the fiber length, the degree of entanglement of the fibers, and the like. Further, when the outer layer paper has two or more layers, it may be adjusted by appropriately selecting a material constituting a layer other than the layer containing the nanofibers.

The outer layer of the present invention preferably has a smoothness of at least one side of the contact with the smoker of 300 seconds or more, more preferably 2,000 seconds or more, still more preferably 4,000 seconds or more.

The smoothness of the present invention is obtained by the Buick smoothness measurement method (JIS P 8119).

In the outer layer paper of the present invention, the high smoothness is a very important factor for the smoker to obtain a good touch when smoking, and in order to improve the smoothness, the diameter of the nanofiber can be controlled, so that the outer layer can be appropriately adjusted. The conditions at which the nanofibers of the paper are formed, that is, the solution characteristics (concentration or viscosity, etc.) of the constituent materials such as the polymer, the spinning environment (temperature, humidity, pressure, etc.), the spinning conditions (applied voltage, solution liquid supply amount) Wait).

The outer paper of the present invention can be used in various smoking articles. As such a smoking article, for example, a filter paper such as a filter paper cigarette, a small cigar, or a filter cigar may be used. The elements constituting the filter paper cigarette, the small cigar, and the filter cigar may be appropriately used by a person skilled in the art. Further, the so-called outer paper of the present invention is used for at least a filter in a smoking article having a filter portion. Part.

The embodiment of the present invention may be, for example, an outer layer paper comprising a single-layer nanofiber having a smoothness of 300 seconds or more after spinning cellulose acetate (acetate) by an electrospinning method. Further, as another embodiment, for example, a paper having a smoothness of 300 seconds or more and a cellulose acetate (acetate) after spinning cellulose acetate (acetate) on the surface of a forest paper by an electrospinning method may be used. An outer layer of two layers of nanofiber layers.

[Examples]

Hereinafter, the present invention will be more specifically described by the examples, but the present invention is not limited to the examples described below as long as the scope of the invention is not exceeded.

<Examples 1 and 2> (smoothness evaluation) Sample preparation

The base paper was set to the first layer by the electrospinning method, and the second layer was set to the nanofiber layer. A sheet sample of the two-layer structure shown in Table 1 below was produced. Further, the tensile strength is measured in accordance with JIS P 8113-1998.

(evaluation method and results)

The smoothness of the sheet sample was measured by the Buick smoothness measurement method (JISP8119), and the results as shown in Table 2 below were obtained.

As can be seen from the above, the smoothness of Examples 1 and 2 is much higher than that of the general outer paper (100 to 200 seconds).

Smoking scent assessment Sample preparation

A commercially available cigarette was used as Comparative Example 1.

A cigarette using the outer layer paper of Example 1 was produced in accordance with the following procedure.

The tobacco rod-containing tobacco stem portion and the filter portion of the same commercial product as in Comparative Example 1 were cut by a cutter, and the inner filter tow portion was taken out from the filter portion after cutting with the forceps simultaneously with the material paper. A charcoal color section of activated carbon, and a plain section that does not contain activated carbon. The cut tobacco stem portion including the shredded tobacco and the charcoal color section and the plain color section of the filter tow portion taken out are closely juxtaposed.

A rectangular shape of 32 mm × 27 mm was cut out from the outer layer paper of Example 1.

For the above-mentioned juxtaposed tobacco rod portion, charcoal color section and plain color section, the outer layer paper of the above-mentioned cut out Example 1 was axially oriented at 32 mm side, 27 mm. The side is in the circumferential direction, and the side of the nanofiber layer is the outer side, and is rolled up one by one.

Further, a sodium carboxymethyl cellulose (Carboxymethyl Cellulose CELLOGEN) chemical paste was used next.

A cigarette using the outer layer paper of Example 2 was produced by the same procedure as above. Table 3 summarizes the produced cigarettes.

<Comparative Functional Evaluation of Cigarettes of Comparative Example 1 and Example 1> (evaluation method)

The cigarette of Comparative Example 1 and the cigarette of Example 1 were compared by 15 testers using the following procedure.

The cigarette of Comparative Example 1 and the cigarette of Example 1 were handed to each tester without any explanation. The cigarette of Comparative Example 1 and the cigarette of Example 1 were picked up by the testers in sequence. Answer the questions in the table below. Also, answer freely for the smoke sensation.

As described in the above Table 5, it is apparent from the answer of the sensory evaluation that the cigarette of Example 1 exhibited a comfortable smoking sensation and a high-grade feeling with respect to the cigarette of Comparative Example 1.

<Comparative Functional Evaluation of Cigarettes of Comparative Example 1 and Example 2> (evaluation method)

The cigarette of Example 2 was also subjected to the same procedure as in Example 1, and was compared with the cigarette of Comparative Example 1 by 15 testers.

As described in the above Table 7, it is apparent from the answer of the sensory evaluation that the cigarette of Example 2 exhibited a comfortable smoking sensation and a high-grade feeling with respect to the cigarette of Comparative Example 1.

1‧‧‧ cut tobacco

2‧‧‧Roll paper

3‧‧‧ Charcoal section filter tow

4‧‧‧ Plain section filter tow

5‧‧‧ outer paper

6‧‧‧ molding paper

7‧‧‧material paper

8‧‧‧Parts of tobacco containing tobacco

9‧‧‧ Filter section

10‧‧‧ Charcoal section (including material paper)

11‧‧‧ plain section (including material paper)

12‧‧‧Nano fiber sheets (Examples 1 and 2)

Claims (10)

An outer layer of paper for smoking articles containing nanofibers. The outer layer paper for smoking articles according to claim 1, wherein the outer layer paper is composed only of a layer containing nanofibers. The outer layer paper for smoking articles according to claim 1, wherein the outer layer paper has two or more layers, and at least one layer is a layer containing nanofibers. The outer layer paper for smoking articles according to any one of claims 1 to 3, wherein the nanofibers have an average fiber diameter of 5 to 800 nm. The outer layer paper for a smoking article according to any one of claims 1 to 4, wherein the layer of the outer fiber containing the nanofiber has a smoothness of 300 seconds or more. The outer layer paper for a smoking article according to any one of claims 1 to 5, wherein the outer layer paper has a tensile strength of 0.5 Newtons/mm or more. The outer layer paper for a smoking article according to any one of claims 1 to 6, wherein the layer comprising the nanofiber constituting the outer layer paper does not contain an adhesive. The outer layer paper for smoking articles according to any one of claims 1 to 7, wherein the nanofibers are plant fibers, synthetic fibers, semi-synthetic fibers, recycled fibers, carbon fibers, inorganic substances or The composite material is composed of. For smoking articles according to any one of claims 1 to 7 The outer paper, wherein the nanofiber is made of calcium carbonate, cellulose, acetate, cotton, poly(meth)acrylate, polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyvinyl acetate, Polyamine, polyurethane or a composite of these materials. A smoking article is the outer paper for smoking articles according to any one of claims 1 to 9.