JPWO2017195245A1 - Tobacco filter web, cigarette filter using the cigarette filter web, and cigarette using the cigarette filter - Google Patents

Abstract

For cigarette filters with excellent adhesion to the filter after winding the filter, excellent workability when winding filter media impregnated with water-soluble liquid in advance, and excellent storage stability after winding Providing a roll of paper. Specifically, it comprises a nonwoven fabric layer composed of hydrophobic fibers and having an interfiber bonding point, the contact angle with respect to water of at least one of the front surface and the back surface is 90 ° or more, and the thickness is 100 μm to 300 μm. A cigarette filter web, or a non-woven fabric layer composed of hydrophobic fibers and having an interfiber bonding point, and an air-impermeable layer, the contact angle of at least one of the front and back surfaces with respect to water being 50 ° or more A cigarette filter web having a thickness of 100 μm to 300 μm is provided.

Description

  The present invention relates to a cigarette filter winding paper, a cigarette filter using the cigarette filter winding paper, and a cigarette using the cigarette filter.

Wrapping paper for smoking articles such as cigarettes, winding paper for wrapping filter material for rod-shaped smoking articles, filter paper such as tip paper for wrapping the filter and tobacco rod together, and cigarette rods A wrapping paper for a rod is known. Here, when wrapping the filter media with the web, the filter media is wrapped in the web and made into a rod, and then one end in the winding direction of the web and the other end are overlapped and glued together. Is called. A portion where the end portions of the web are overlapped is called a wrap portion.
On the other hand, a capsule enclosing a fluid material is introduced into a filter of a cigarette with a filter, and a smoker presses the capsule so that the fluid material in the capsule penetrates the filter medium of the filter and changes the taste during smoking. Cigarettes are known (Patent Document 1).
Patent Document 1 describes that at least a part of the filter assembly is covered with a fluid-impermeable material. In addition, it is described that such a configuration can prevent or eliminate contamination of the leading edge paper when the fluid material is discharged from the capsule. As the fluid-impermeable material, cellophane, polyvinylidene chloride, or a substantially impermeable film or sheet is described.

Japanese translation of PCT publication No. 2008-539717

The properties of the web for cigarette filters are required to have good moldability, adhesiveness of the wrap part when the filter is wound, and adhesiveness of the wrap part after manufacture. The formability here means that the web can be wound on the filter medium at a predetermined speed.
In addition, when water-soluble liquid is impregnated in the filter medium of the tobacco filter, storage stability is required so that the water-soluble liquid does not leak out of the filter after winding. Further, when winding the filter medium preliminarily impregnated with a water-soluble liquid, it is required that the web has durability against the water-soluble liquid in order to perform winding well. It is done.
No conventional cigarette filter webs satisfy all of the above characteristics.

  The present invention has been made in view of such circumstances, and is excellent in moldability, adhesiveness of the wrap part when the filter is wound, and excellent adhesiveness of the wrap part after manufacture. An object of the present invention is to provide a roll paper for a tobacco filter which is excellent in durability against the liquid when winding the filter medium impregnated with a water-soluble liquid and excellent in storage stability after winding.

  In the present invention, in order to solve the above-mentioned problems, a non-woven fabric layer composed of hydrophobic fibers and having an interfiber bonding point is included as a cigarette filter web (hereinafter also simply referred to as a web), and the front and back surfaces of the filter are included. The contact angle with respect to water of at least one surface is 90 ° or more, the thickness is 100 μm to 300 μm, or it is composed of a hydrophobic fiber, and includes a non-woven fabric layer having an interfiber bonding point, and an air impermeable layer, The contact angle with respect to water of at least one of the front surface and the back surface was 50 ° or more, and the thickness was 100 μm to 300 μm.

The present invention relates to the following contents.
[1] A non-woven fabric layer composed of hydrophobic fibers and having an interfiber bonding point, having a contact angle with water of at least one of the front and back surfaces of 90 ° or more and a thickness of 100 μm to 300 μm. Paper for cigarette filters.
[2] A non-woven fabric layer composed of hydrophobic fibers and having an interfiber bonding point and an air-impermeable layer, wherein the contact angle with respect to water of at least one of the front surface and the back surface is 50 ° or more, and the thickness A web for cigarette filters having a thickness of 100 μm to 300 μm.
[3] The web for cigarette filters according to [2], wherein the air-impermeable layer is a layer made of polyolefin.
[4] The tobacco filter web according to any one of [1] to [3], wherein the Ra value of at least one of the front surface and the back surface is 10 or more.
[5] The web for cigarette filters according to any one of [1] to [4], wherein the hydrophobic fiber is a fiber having a double-core sheath structure.
[6] A cigarette filter comprising the cigarette filter paper according to any one of [1] to [5] and a filter medium.
[7] The tobacco filter according to [6], wherein a water-soluble liquid is added to the filter medium.
[8] A cigarette comprising the tobacco filter according to [6] or [7] and a tobacco rod.

  According to the present invention, the moldability is excellent, the adhesiveness of the wrap part when the filter is wound after the filter is wound, and the adhesiveness of the wrap part after manufacture, and the water-soluble liquid is impregnated in advance. Further, it is possible to provide a paper for a cigarette filter which is excellent in durability against water-soluble liquid when the filter medium of the filter is wound and excellent in storage stability after winding.

FIG. 1 is an exploded perspective view of a cigarette according to one embodiment of the present invention. FIG. 2 is a view showing a cross section of the sheet-like web before winding the filter section according to the first embodiment of the present invention. FIG. 3 is a view showing a cross section of a sheet-shaped web before the filter section according to the second embodiment of the present invention is wound. It is the schematic which shows the joint point between fibers produced by heat-sealing hydrophobic fiber. It is the schematic which shows the contact angle with respect to water.

<First aspect>
In the first aspect of the present invention, in the cigarette filter web, a nonwoven fabric composed of hydrophobic fibers forms the web.
The hydrophobic fibers constituting the nonwoven fabric have interfiber bonding points. By having the inter-fiber bonding point, the tensile strength required for the web is brought, and the winding property at high speed is excellent. The interfiber bonding point in the present invention means that the hydrophobic fibers have a plurality of points bonded to each other through heat fusion or an adhesive.

The thickness of the web of the first aspect of the present invention is 100 μm to 300 μm. In the case of such a thickness, when the water-soluble liquid is added to the filter medium, it is possible to prevent the water-soluble liquid from leaking outside the filter by using the web as a buffer.
The thickness of the web is more preferably 200 to 300 μm. From the viewpoint of preventing leakage of the water-soluble liquid from the filter medium to which the water-soluble liquid is added and securing the adhesiveness of the wrap portion over a long period of time, it is preferably as thick as possible. Moreover, since the thickness is 100 μm or more, the moldability as a cigarette filter web is excellent. In the present specification, excellent formability means that the web can be wound on the filter medium at a predetermined speed.
In the first aspect of the present invention, the layer thickness of the web corresponds to the thickness of the nonwoven fabric constituting the web.
In the present invention, the “water-soluble liquid” refers to a liquid containing 3% by weight or more of water. Such water-soluble liquids are not compatible with hydrophobic fibers.

In the present invention, the thickness of the web is measured based on JISP8118 (paper and paperboard-thickness and density test method. Paper surface pressure is 100 kPa.
The thickness of the web obtained by the above measurement method is an average thickness.

Further, the contact of water on either side of the web is 90 ° or more. In the web of the first aspect of the present invention, either side has a contact angle in such a range, so that sufficient waterproofness is ensured even when a water-soluble liquid is added to the filter medium. It is possible to prevent the water-soluble liquid from leaking outside.
The contact angle with respect to water was measured using Kyowa Interface Science Co., Ltd. “DROP MASTER” as a measuring device. As measurement conditions, 2 μL of a drop of distilled water was dropped on a test specimen, and the contact angle after 0.1 second was 1 / Measured by 2θ method. The method for measuring the contact angle with respect to water is the same in the following second embodiment. FIG. 5 conceptually shows the contact angle with water.

Hydrophobic fibers include, for example, polyolefins such as polyethylene and polypropylene, fibers composed of thermoplastic resins other than polyolefins such as nylon and polyester, or composite fibers combining fibers composed of these thermoplastic resins. be able to.
Among these, it is preferable to use polyolefin fibers, and among them, it is more preferable to use polyethylene or polypropylene fibers, because when the interfiber bonding points are formed by heat, the fibers can be fused at a low temperature.
Although there is no restriction | limiting in particular as molecular weight of thermoplastic resins like polyolefin which comprises hydrophobic fiber, The mass mean molecular weight (Mw) measured by GPC (Gel Permeation Chromatography) and converted with the calibration curve of the standard polystyrene is normal. The aspect which is 20,000-300,000 can be mentioned.

Further, the hydrophobic fiber may be a fiber having a double core sheath structure. In that case, an embodiment in which the material constituting the outer side and the inner side is both polyolefin can be mentioned.
For example, it is easy to use what has a double core sheath structure in which the inner side is made of polypropylene and the outer side is combined with the above resin having a lower melting point than that of the polypropylene.
Further, for example, a double core sheath structure in which the outer side is made of polyethylene and the inner side is made of polypropylene can be preferably used. By using such a double-core sheath structure, when generating inter-fiber bonding points by thermal fusion, the fiber shape can be maintained while increasing the thermal fusion points between the fibers. It is suitable for increasing.
The above molecular weight range can also be applied to the resin constituting the fiber having such a double-core-sheath structure.
As a fiber diameter of the hydrophobic fiber which comprises a nonwoven fabric, 0.1-20 dtex can be mentioned, for example.
For the fibers constituting the nonwoven fabric used in the second aspect of the present invention described below, the same conditions can be used for the manufacturing method, resin type, molecular weight and other conditions described above.

In the cigarette filter web, the non-woven fabric constituting one surface thereof is made of hydrophobic fibers, so that the contact angle of the surface with water increases.
The contact angle of either surface of the cigarette filter web makes it possible to prevent the water-soluble liquid from penetrating the cigarette filter web, and the water-soluble liquid penetrates the cigarette filter. The web can be prevented from being torn or fragile.
Ordinary cigarette filter webs are made of paper made from pulp, and the fibers that make up the paper are bonded together by intermolecular forces or partial hydrogen bonds. Therefore, when the water-soluble liquid penetrates into the web, a weak bond between the fibers is separated and broken or becomes brittle. On the other hand, in the present invention, there is a lot of voids between the hydrophobic fibers, and at first glance it seems that water is likely to permeate, but because it is composed of hydrophobic fibers and bonded by interfiber bonding points, Water does not penetrate easily and does not break or become brittle.

In the production of nonwoven fabrics, there are a web forming process and a bonding process. Known types of forming processes include a carding method and an airlaid method in which short fibers are laminated randomly in the air, and a wet method in which short fibers are dispersed in water. Subsequent bonding processes include chemical bonds that apply water-soluble or water-insoluble adhesives by dipping or spraying, thermal bonds by thermal fusion of thermoplastic resins or fibers, needles that pierce needles and mechanically entangle the fibers. Examples of the water entanglement method include a punch and a high-pressure water jet. In addition, as a method in which the forming process and the bonding process are a series of processes, a spun bond method and a melt blown method can be cited as general-purpose techniques. The former forms a long fiber by spinning while heating and melting a thermoplastic resin, and the latter forms a web while discharging the short fiber, and at the same time, the bonding proceeds by the heat.
In the process of manufacturing a nonwoven fabric, the nonwoven fabric having a thermal bonding point between hydrophobic fibers has a bonding point between the hydrophobic fibers, so that it has durability when a water-soluble liquid penetrates. Since it is composed of hydrophobic fibers, it is difficult for water-soluble liquids to penetrate.
In the process of manufacturing the nonwoven fabric, the nonwoven fabric having an adhesion point due to the non-water-soluble adhesive between the hydrophobic fibers is because the hydrophobic fibers have interfiber bonding points, so that the water-soluble liquid penetrates. It has durability and is made of hydrophobic fibers in the first place, making it difficult for water-soluble liquids to penetrate.
As a method for bonding fibers, it is preferable to use a thermal bond method because it is easy to control the surface roughness and has little influence on the taste of cigarette.

The surface roughness of the cigarette filter web is preferably 10 or more in terms of Ra value. When the Ra value is 10 or more, the adhesiveness of the wrap portion when the filter is wound is improved. Thus, it is possible to prevent the filter paper from being wrapped in a cylindrical shape and the adhesive surface of the wrap part from being peeled off and the web to be peeled off from the filter medium. Ra is usually 50 or less.
The surface roughness Ra of the nonwoven fabric as the web is adjusted by, for example, rolling after the nonwoven fabric is manufactured, adjusting the fiber diameter of the hydrophobic fibers forming the nonwoven fabric, or adjusting the basis weight of the nonwoven fabric. it can.
The Ra value of the web is, for example, a condition based on ISO 1997 using “Surf Test SJ-201 (stylus tip R = 2 μm and tip angle 60 °)” manufactured by Mitutoyo Corporation, using a Gaussian filter as a filter process. (Cutoff value λc = 2.5 mm, λs = 8 μm, number of sections (N) 4) can be employed for measurement.
The web of the first aspect of the present invention is substantially air permeable. This means that there are voids in the web, which provides an anchor effect when bonding the wrap when the filter is wound, improves the adhesion of the wrap and improves the winding of the filter media. The web does not peel off later.

The basis weight of the web of the first aspect of the present invention is preferably 20 to 50 gsm. The basis weight of the web in the first aspect of the present invention corresponds to the basis weight of the nonwoven fabric constituting the web.
When the basis weight is within the above range, it contributes to the improvement of the waterproof property of the web, and even when a water-soluble liquid is added to the filter medium, the water-soluble liquid can be prevented from leaking outside the filter.
This basis weight can be adjusted by adjusting the amount of fibers supplied during the production of the nonwoven fabric used for the web, or by adjusting the thickness of the nonwoven fabric.
The basis weight was determined by calculating the weight per unit area after cutting the nonwoven fabric into a square shape with a side of 10 cm and weighing it. Weighing is performed after storing for a sufficient time to achieve equilibrium moisture in an environment of 22 ° C. and 60%. The same applies to the following second embodiment.
In the first aspect of the present invention, it is basically assumed that the nonwoven fabric forms a web by itself. However, as long as the features described above are not impaired, other configurations other than the nonwoven fabric, such as some reinforcing material, etc. May be included.

<Second aspect>
The second aspect of the present invention is a web having a non-woven fabric (hereinafter also simply referred to as non-woven fabric) layer composed of hydrophobic fibers and having an interfiber bond and a layer composed of an air-impermeable layer.
The non-woven fabric layer and the air-impermeable layer are laminated so that the respective surfaces are opposed to each other.
Regarding the method of lamination, a method of laminating a nonwoven fabric layer and an air impermeable layer and then applying pressure by applying heat, or melting a thermoplastic resin to the nonwoven fabric used as a substrate and extruding it onto a film An extrusion laminating method for laminating can be mentioned.
In addition to the non-woven fabric layer, the web has an air-impermeable layer, so that the effect obtained by the non-woven fabric described above can be obtained, and the filter medium to which a water-soluble liquid is added is wound up. Even when doing so, sufficient waterproofness can be ensured and storage stability is excellent. Excellent storage stability means that the water-soluble liquid does not leak out of the filter after winding the filter medium to which the water-soluble liquid is added.
Further, even when the filter is pressed during use of the filter wound by the user with the web, the water-soluble liquid can be prevented from leaking to the outside.

The thickness of the web made of these layers is 100 μm to 300 μm, as in the first aspect of the present invention.
When a water-soluble liquid is added to the filter medium, the water-soluble liquid permeates from the nonwoven fabric layer exposed on the cut surface of the web at the wrap portion, and the water-soluble liquid easily leaks out of the filter. In such a case, when the thickness of the web is 100 μm or more, the web can serve as a buffer and prevent the water-soluble liquid from leaking outside the filter.
The layer thickness of the web of the second aspect of the present invention is more preferably 100 to 200 μm. From the viewpoint of preventing leakage of the water-soluble liquid from the filter to which the water-soluble liquid is added, it is preferably as thick as possible. Further, when the thickness is 100 μm or more, sufficient tensile strength can be secured as a cigarette filter web, and the moldability is excellent. The excellent formability means that the web can be wound on the filter medium at a predetermined speed.
The layer thickness of the web of the second aspect of the present invention means the layer thickness after laminating the nonwoven fabric layer and the air impermeable layer.

In the second aspect of the present invention, the web has a layer composed of a non-woven fabric and an air-impermeable layer, but the thickness of the web is the total thickness including these layers. Equivalent to.
There are no particular restrictions on the thicknesses of the layer composed of the nonwoven fabric and the air-impermeable layer, but the thickness of the layer composed of the nonwoven fabric is 50 to 290 μm, and the thickness of the air-impermeable layer is 10 ˜50 μm can be mentioned. In addition, these thickness means the thickness after shape | molding as a web (after laminating).
In the second aspect of the present invention, when the filter medium to be wound contains a water-soluble liquid, the water-soluble liquid is stopped with an air-impermeable layer, and the non-woven fabric layer having a sufficient thickness as described above is used. In addition, it is possible to ensure the adhesiveness of the lap portion over a long period after production.

  As a layer comprised from a nonwoven fabric, as mentioned above, the same thing as a 1st aspect of said this invention can be used for the kind and thickness of a manufacturing method, resin, etc. as mentioned above.

The air impermeable layer in the present invention has an air permeability of 0 CU.
The air-impermeable layer does not allow air to pass through and does not allow water-soluble liquids to pass through. Since the air-impermeable layer has such properties, the moldability and waterproofness required for the web of the present invention can be ensured.
As an aspect of the air impermeable layer, a film made of a thermoplastic raw material can be given as a representative of polyolefin. A commercially available film made of a thermoplastic material can be used. Examples thereof include polyethylene, polypropylene, a copolymer of ethylene and propylene, nylon, and a polyester film.
Although there is no restriction | limiting in particular as molecular weight of polyolefin, The mass average molecular weight (Mw) measured by GPC (Gel Permeation Chromatography) and converted with the calibration curve of standard polystyrene is usually 20,000-300,000. Can be mentioned.

Moreover, about the web of the 2nd aspect of this invention, it is preferable that the contact angle with respect to the water of the surface of at least any one of a surface or a back surface is 50 degrees or more. The surface having a contact angle with water of 50 ° or more is preferably a surface exposed to the outer surface of the layer composed of the nonwoven fabric.
When the contact angle with water is 50 ° or more, the water resistance of the web is excellent, and even when a water-soluble liquid is added to the filter medium, the paper leaks out of the web or the tensile strength of the web decreases. There is nothing.
In the web of the second aspect of the present invention, it is preferable that the surface roughness of at least one of the front surface and the back surface is 10 or more in terms of Ra value. When the Ra value is 10 or more, the adhesiveness of the lap portion is improved. Thereby, it is possible to prevent the web from being peeled off from the filter medium.
It is preferable that the surface of the web having the Ra value is a surface on the outer surface side of the filter. Moreover, it is preferable that this surface is a surface exposed to the outer surface of the layer comprised from a nonwoven fabric. By doing so, when the filter medium is infiltrated with an aqueous solution, the air-impermeable layer prevents the infiltration of water-soluble liquid into the web, and the wrap portion has excellent adhesion over a long period of time. Become.
In the second aspect, the wrap portion is formed by overlapping both ends in the winding direction of the web, but the surface of the layer composed of the nonwoven fabric and the surface of the air impermeable layer are overlapped. It may be glued so that the surfaces of the layers composed of the nonwoven fabric are in contact with each other by folding one end of the winding paper in the winding direction to the inner surface side (filter medium side). . Moreover, in the part where the both ends of the winding direction of winding paper are piled up, only an air-impermeable layer may be removed and the layers comprised from a nonwoven fabric may be contacted and glued.

The basis weight of the web of the second aspect of the present invention is preferably 30 to 100 gsm. The basis weight of the web in the first aspect of the present invention corresponds to the total basis weight of the layer composed of the nonwoven fabric constituting the web and the air-impermeable layer.
When the basis weight is in the above range, it contributes to the improvement of the waterproof property of the web, and even when a water-soluble liquid is added to the filter medium, the water-soluble liquid can be prevented from leaking outside the filter.
This basis weight can be adjusted by adjusting the thickness of the layer composed of the nonwoven fabric constituting the web and the air-impermeable layer.

In both the first aspect and the second aspect, the web of the present invention preferably has a permeability of 27000 to 45000 CU (Cholesta unit) of a layer composed of a nonwoven fabric constituting the web. By having such air permeability, sufficient voids are present between the fibers of the nonwoven fabric, and appropriate surface roughness is provided, so that the adhesiveness with the filter medium is improved.
The air permeability can be adjusted, for example, by adjusting the type of fiber, the thickness of the fiber, the amount of fiber, the thickness of the nonwoven fabric, and the like at the time of manufacturing the nonwoven fabric.
In the second aspect of the present invention, the air permeability of the web of the second aspect is zero because the paper has the air impermeable layer.
The air permeability referred to in the present invention refers to the flow rate of air permeated (permeated) per minute / cm ² when air is passed from one side (2 cm ² ) of paper under a constant pressure of 1 kPa.
In the second aspect of the present invention, it is basically assumed that the nonwoven fabric and the air impermeable layer form a web, but unless the features described above are impaired, the nonwoven fabric and the air impermeable layer are not used. Other configurations such as some reinforcing material may be included.

<Example of cigarette>
FIG. 1 is an exploded perspective view of an embodiment of a cigarette 1 with a filter using an example of a web of the present invention. The cigarette 1 is a cigarette with a filter including a cigarette rod 2 and a filter 4 connected to one end of the cigarette rod 2 via a chip paper 3.

  The tobacco rod 2 is formed by winding a tobacco stamp 21 with a wrapping paper 22 for a rod to form a cylindrical shape (bar shape). The filter 4 is a part that filters the smoke component contained in the mainstream smoke when passing the mainstream smoke generated when the cigarette 1 is smoked, and is formed into a columnar shape substantially the same diameter as the tobacco rod 2. Molded.

  The filter 4 is wound around the tip paper 3 and is connected to the rear end side of the tobacco rod 2 via the tip paper 3. The chip paper 3 connects the end portion of the tobacco rod 2 and the filter 4 by winding them together. A vent hole 31 for introducing outside air (air) for diluting mainstream smoke into the filter 4 is formed in an area of the chip paper 3 that covers the filter 4. The ventilation holes 31 are so-called ventilation outside air introduction holes, and a plurality of ventilation holes 31 are provided in the chip paper 3. The air introduced from the vent hole 31 of the chip paper 3 dilutes the mainstream smoke passing through the filter 4. The vent hole 31 in the chip paper 3 is not an essential configuration, and the installation mode of the vent hole 31 can be changed as appropriate. In the case where the web is composed of a single layer of breathable nonwoven fabric as in the first embodiment, the vent holes 31 may be provided only in the chip paper 3. In addition, when the web includes a layer having an air impermeable layer as in the second embodiment, it is mainstream to install a vent hole in the web so that the position corresponds to the vent 31 installed in the chip paper 3. It is possible to introduce air for smoke dilution.

The filter 4 has a filter section 7 formed by winding a filter medium 5 such as cellulose acetate tow with the web 6 of the present invention.
As the web 6, the first embodiment (FIG. 2) or the second embodiment (FIG. 3) of the present invention can be used. When using the thing of the 2nd aspect, it is desirable from the viewpoint of ensuring the adhesive strength of the wrap part of the wound paper when winding or winding the layer composed of the nonwoven fabric as the outer surface side .
The method of winding the filter medium 5 using the web 6 can be performed by a known hoisting machine or the like, and the filter medium 5 can be wrapped by adhering the wrap portion of the web using a known adhesive.
The filter medium 5 of the filter section 7 in this embodiment can include an aspect in which a water-soluble liquid is added. The water-soluble liquid contains propylene glycol (PG), glycerin (G), water and the like described below. The filter section 7 is also referred to as the filter of the present invention.

<Water-soluble liquid added to filter media>
The web of the present invention is used for winding a filter medium. The wrapping paper of the present invention is suitable for winding up a filter medium to which a water-soluble liquid containing propylene glycol, glycerin, water, or the like is added.
The water-soluble liquid added to the filter medium of the filter is not particularly limited, and in addition to those containing propylene glycol, glycerin, water, etc. as described above, in addition to these, various additives such as fragrances are included. May be.

Propylene glycol is contained in the solution added to the filter section 7 so that limonene, which is one of the fragrance components, can be removed while selectively removing certain components contained in the smoke during smoking, such as phenol. Without passing through the filter 4. Moreover, it can prevent that the propylene glycol contained in the said solution volatilizes and lose | disappears during storage of a cigarette because the solution added to the filter section 7 contains glycerin. In addition, commercially available propylene glycol and glycerin can be used.
The weight ratio of propylene glycol, glycerin and water in the water-soluble liquid added to the filter medium is not particularly limited, and in the case of a cigarette with a filter having a circumference of 24.0 to 25.0 mm, the filter of the cigarette with a filter As an amount added to the filter medium, for example, propylene glycol can include 10 to 100 mg / filter, glycerol can include 1 to 150 mg / filter, and water can include 5 to 100 mg / filter. The aspect which is can be mentioned.

The solution added to the filter section 7 may contain a thickener. The type of thickener can be used without particular limitation as long as it is soluble in propylene glycol, glycerin and water. For example, xanthan gum, gellan gum, psyllium seed gum, pectin, carboxymethylcellulose, hydroxypropylcellulose , Polyvinyl alcohol, agarose, pullulan, alginic acid, polyacrylic acid, and alkali metal salts or alkaline earth metal salts thereof.
The amount of the water-soluble liquid added to the filter medium is not particularly limited. However, as a guideline, in the case of a general cigarette with a filter having a circumference of 24.0 to 25.0 mm, it is added to the filter medium of the cigarette with filter. Examples of the amount include 10 to 300 mg / filter.

  FIG. 3 is a view showing a second mode of the sheet-like web 6 before the filter section 7 according to the first embodiment is wound. In the web 6, an air impermeable layer 61 is formed on one surface of a layer 62 made of a nonwoven fabric. In addition, the winding paper 6 winds the filter section 7 so that the layer 62 composed of the nonwoven fabric becomes an outer surface facing the outer peripheral surface of the filter medium 5. Examples of the air-impermeable layer 61 of the web 6 include a mode in which the film-like layer is laminated in contact with the layer 62 composed of a nonwoven fabric as described above.

  Examples The present invention will be described more specifically with reference to examples. However, the present invention is not limited to the description of the following examples unless it exceeds the gist.

<Example>
In the following tests, the physical properties (design), paper properties and mechanical properties (formability), waterproofness (affecting durability) of various samples, peel strength (lap adhesiveness) on actual rolls, and liquid leakage Measurements were made on (storage stability).
The sample used for the following test is demonstrated.
<Wind paper test product>
As a comparative example, a commonly used web (paper containing wood pulp as a main component), polypropylene film (air-impermeable film), and cellophane film (high-density cellulose) were used.
As the web of the present invention, as shown in Table 1, a nonwoven fabric in which polyethylene is used as a hydrophobic fiber and a nonwoven fabric in which a polyethylene film is laminated are adopted. All of the nonwoven fabrics have interfiber bonding points generated by heat sealing.
Note that the web used in Example 2 was a nonwoven fabric having a layer thickness of 145 μm and a polyethylene film having a layer thickness of 20 μm. As the web used in Example 4, a nonwoven fabric having a layer thickness of 220 μm and a polyethylene film having a layer thickness of 20 μm was used. Since pressure is applied when laminating a nonwoven fabric and a polyethylene film in both Example 2 and Example 4, after lamination, compared to the total thickness of the nonwoven fabric and polyethylene film before laminating Decreased in thickness, the thickness of the web after lamination in Example 2 was 126 μm, and the thickness of the web after lamination in Example 4 was 194 μm.
<Desktop test method>
Among the items described in Table 1, thickness, surface roughness (Ra), and contact angle with water were measured by the following methods.
1. Paper properties evaluation
ii) Thickness
JISP8118 Paper and paperboard-Measured based on thickness and density test methods. The paper surface pressure was 100 kPa.
ii) Roughness / measuring instrument “Surf Test SJ-210” manufactured by Mitutoyo Corporation was used.
(Stylus tip R = 2 μm and tip angle 60 °)
-Filter processing Gaussian filter-Measurement conditions Conforms to ISO1997.
(Cutoff value λc = 2.5 mm, λs = 8 μm, number of sections (N) 4)
iii) Contact angle / measuring instrument Kyowa Interface Science Co., Ltd. “DROP MASTER”
・ Measurement conditions Drop 2 μl of distilled water on the specimen and measure the contact angle after 0.1 second by 1 / 2θ method.
iv) Basis weight Basis weight was obtained by cutting a nonwoven fabric into a square shape having a side of 10 cm, and then weighing and calculating the weight per unit area. Weighing was carried out after storage for a sufficient time to achieve equilibrium moisture in an environment of 22 ° C. and 60%.

2. Waterproof evaluation (surface waterproof screening)
Place a set of filter paper of the same size under a 6 cm square test piece in a petri dish, place 2 g of distilled water with a red pigment on the upper surface of the test piece at once, and quickly cover and seal. . After 73 hours, the lower filter paper is observed. If the diameter of the red pigment on the filter paper due to leakage exceeds 1 cm, “No waterproof” is indicated. If it is less than 1 cm, “△” is indicated. Those that were not visible were judged to be “waterproof”.
This “waterproofness” affects the durability of the web, and the better the waterproofness, the higher the durability.

<Practical test method>
Each web shown in Table 1 below was wound on a filter medium using a filter hoist. At that time, the maximum number of rotations capable of stable winding was confirmed. Moreover, the peel strength of the lap part after storing the filter, water absorption to the web, and the degree of liquid leakage to the outer surface were confirmed. The storage was performed by winding and sealing in a vinyl bag and leaving it at 23 ° C. and 60%. In addition, about the sample whose one side is a laminate surface, it wound up so that the laminate surface might become inside (toe side) at the time of winding.

<Specifications of water-soluble liquid added to filter media>
Since water alone vaporizes and disperses, it was practically used as a mixture of propylene glycol, glycerin and water.
Filter material 6y35000
・ Additive liquid (propylene glycol: glycerin: water) = 50:25:25 (w / w / w) (added a very small amount of colorant to check for leakage)
・ Addition amount 50mg / 10mm filter

(1) Adhesive part peel strength (adhesiveness of wrap part)
With respect to the prepared filter web, the opposite side of the wrap portion was cut in parallel with the wrap paste line.
The tip of the cut-out web was slightly peeled off by hand to create a knob. Each knob portion was attached to a peel tester, and a 180 degree peel test was performed. As a measurement result, a median value from the start of measurement to 40 mm was obtained, and an average value of the five repetitions was expressed in g.
A measurement result of less than 15 g was evaluated as x, and 15 g or more as ◯.

(2) Wound paper absorption / leakage (after 1 day and 10 days)
Judgment was made based on the degree of red coloring of the entire web and the color transfer when the tissue was pressed against the surface. This result shows the storage stability after winding the web.
[Degree of leakage]
×: The entire surface of the web (almost 100%), △: Partially leaked, ○: Slightly leaked, ◎: None (3) Filter hoisting speed rated capacity of 3300 rpm It was. Those that can be wound up at 1500 rpm have excellent moldability.
The results of measurement under the above conditions are shown in Table 1 below.

The samples described in Table 1 and Table 2 below are briefly described below.
Comparative Example 1 (Plain paper): Wound paper made using pulp as a material.
Comparative Example 2 (High air permeability paper): A paper roll obtained by mixing rayon and pulp.
Comparative Example 3 (cellophane): A film-like web obtained using viscose.
Comparative Example 4 (Laminated paper): This is a paper obtained by laminating a film made of polyethylene on one side of paper made with pulp.
Comparative Example 5 (Lamy-Paper-Lamy): A web obtained by laminating a film made of polyethylene on both sides of paper made with pulp.
Example 1 (Olefin PPPE25): A wrapping paper made of a nonwoven fabric (basis weight 25 gsm) obtained by using a double core sheath structure fiber made of polypropylene on the inside and polyethylene on the outside as hydrophobic fibers.
Example 2 (Olefin PPPE25 Lami): Obtained by laminating a polyethylene film on a non-woven fabric (basis weight 25 gsm) obtained by using a double-core sheath structure fiber made of polypropylene on the inside and polyethylene on the outside as hydrophobic fibers. It is a web.
Example 3: (Olefin PPPE40): A web made of a nonwoven fabric (basis weight 40 gsm) obtained by using a double core sheath structure fiber made of polypropylene on the inside and polyethylene on the outside as hydrophobic fibers.
Example 4 (Olefin PPPE40 Lami): A web obtained by laminating a polyethylene film on a non-woven fabric (basis weight 40 gsm) obtained by using a double-core sheath fiber made of polypropylene on the inside and polyethylene on the outside.

<Results and discussion>
Comparative Example 1 is a web made of so-called general-purpose paper (plain paper) composed of fibers mainly composed of wood pulp. Since the hoisting machine can be operated at high speed because it is general-purpose, the contact angle with water is low and it is easy to get wet. Therefore, the hydrophilic binding portion as a main component easily collapses, resulting in peeling.

Comparative Example 2 is a highly air-permeable web containing fibers mainly composed of wood pulp and rayon, which is a recycled fiber. Since chemicals are applied to increase the water resistance, the initial contact angle with water is very high although it has a void structure. In addition, the surface is sufficiently rough and high speed operation is possible.
However, the water-soluble liquid gradually enters the hydrophilic bonding sites between the fibers with time, and the thickness of the buffer zone of the water-soluble liquid is not sufficient at 55 μm. . In the amount of liquid in the addition filter this time, the liquid leakage evaluation after storage for one day is Δ, which seems to be a practical limit. In order to use it more safely, the waterproofness of the web itself is further improved, and the thickness is preferably 55 μm or more.

  Comparative Example 3 is a cellophane (cellulose film) having a barrier function substantially free of void structure through which water or air passes. Nevertheless, as can be seen from the low contact angle with water, it was highly hydrophilic and swelled and disintegrated over time. Further, since there is almost no surface roughness and sufficient adhesive strength cannot be obtained at the lap portion, it is difficult to even wind up under normal settings. Even if a waterproofing effect is obtained by applying a water-resistant chemical, it is not practical.

  Comparative Example 4 is a composite paper obtained by laminating one side of the plain paper of Comparative Example 1 with a water-repellent olefin. There is no breathability and the laminate surface is hydrophobic, so there is sufficient water resistance on the desk. However, both sides have the roughness of plain paper, but the barrier effect of the laminate surface is high and the penetration of glue is limited, so the operation speed is slightly lower than that of pulp, and the waterproofness as an essential filter Weak and unbearable for practical use. This is because even if the laminate surface is inside the filter, water enters from the pulp cross section of the wrap portion (adhesive portion) of the web and spreads from the surface to the surface. At the same time, the peel strength is also out of the practical range due to a decrease in adhesive strength.

  Comparative Example 5 is a web having a structure in which both surfaces of Comparative Example 1 are laminated with a water-repellent olefin (polyethylene). As with Comparative Example 4, the laminate surface is hydrophobic and the water resistance on the desk is sufficient because the laminate surface is hydrophobic. However, since the penetration of the glue is remarkably limited on both sides, the operable speed is further lowered than that of Comparative Example 4. The waterproofness as a filter is not perfect, but higher than Comparative Example 4. However, it is the same as Comparative Example 4 in terms of a decrease in peel strength, and is not at a practical level.

The difference between Examples 1 and 3 is the thickness of the nonwoven fabric composed of double-core sheath structure fibers made of polypropylene on the inside and polyethylene on the outside as hydrophobic fibers. Since all the webs have a sufficient surface roughness, they show a strong adhesive force at the lap portion and can be operated at high speed. The layer composed of polyolefin fibers has a high contact angle with water, and exhibits a high waterproof property while having a void structure that allows water and air to pass through easily.
However, since a certain pressure is applied during filter molding, a phenomenon occurs in which water is pushed into the through hole. Therefore, the waterproofness can be further improved by increasing the thickness and providing a buffer zone of a water-soluble liquid as in Example 3. In addition, sufficient peel strength is obtained by the effect of water-to-fiber bonding and very large surface roughness.

  For more complete waterproofing, a polyethylene film is laminated as an air-impermeable layer on one side of a nonwoven fabric using a double-core sheath structure fiber made of polypropylene on the inside and polyethylene on the outside as shown in Examples 2 and 4. Is effective. Since the surface roughness Ra of at least one surface is large compared to those of Comparative Example 4, the adhesive strength of the lap portion is shown and the operation can be performed at the same level as in Comparative Example 1. A double-sided laminate is not recommended because it causes a reduction in the operable speed as in Comparative Example 5. In terms of waterproofness, the problem of pressure at the time of molding is eliminated by eliminating the through-holes, and since the fiber-to-fiber bond is strong against water, long-term quality assurance is possible. However, it is in a sufficiently usable range.

DESCRIPTION OF SYMBOLS 1 ... Cigarette 2 ... Cigarette rod 3 ... Chip paper 4 ... Filter 5 ... Filter material 6 ... Winding paper 7 ... Filter section 8 ... Hydrophobic fiber 9 ... Fiber Interbonding point 10 ... fused portion 61 ... air impermeable layer 62 ... layer composed of nonwoven fabric

Claims (8)

  For cigarette filters comprising a non-woven fabric layer comprising hydrophobic fibers, having a contact angle with water of at least one of the front and back surfaces of 90 ° or more and a thickness of 100 μm to 300 μm Wrapping paper.   A non-woven fabric layer composed of hydrophobic fibers and having an interfiber bonding point and an air-impermeable layer, at least one of the front surface and the back surface has a contact angle with water of 50 ° or more, and has a thickness of 100 μm to A web for cigarette filters having a thickness of 300 μm.   The paper for cigarette filters according to claim 2, wherein the air-impermeable layer is a layer made of polyolefin.   The tobacco filter paper according to any one of claims 1 to 3, wherein the Ra value of at least one of the front surface and the back surface is 10 or more.   The cigarette filter web according to any one of claims 1 to 4, wherein the hydrophobic fibers are fibers having a double-core-sheath structure.   A cigarette filter comprising the cigarette filter paper according to any one of claims 1 to 5 and a filter medium.   The tobacco filter according to claim 6, wherein a water-soluble liquid is added to the filter medium.   A cigarette comprising the tobacco filter according to claim 6 or 7 and a tobacco rod.

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