TW201739361A - Tobacco filter wrapper, use thereof for a tobacco filter, and use of the tobacco filter for a cigarette - Google Patents

Abstract

The invention provides a wrapper for a tobacco filter. After bypassing the filter by the wrapper, the adhesion to the filter is excellent. When bypassing a water-soluable liquid soaked filter medium by the wrapper, the workability is excellent, and after wrapped, the stability is excellent. Particularly, the invention provides a non-woven layer composed of hydrophobic fibers with binding points among fibers; the contact angle with water of at least one face of both front and back faces is 90 DEG or greater and the thickness of the wrapper is between 100 [mu]m and 300 [mu]m; or provides a non-woven and an imperable layers comprised by hydrophobic fibers with binding points between fibers; the contact angle with water of at least one face of both front and back faces is 50 DEG or greater and the thickness of the wrapper is between 100 [mu]m and 300 [mu]m.

Description

Winding paper for tobacco filter, tobacco filter using the paper for winding the tobacco filter, and cigarette using the tobacco filter

The present invention relates to a wound paper for a tobacco filter, a tobacco filter using the wound paper for the tobacco filter, and a cigarette using the tobacco filter.

In the case of a roll paper in a stick-shaped smoking article such as a cigarette, a winding paper of a filter material for a filter for a rod-shaped smoking article is known, and a filter is packaged with a tobacco rod (tobacco rod). A roll paper for a filter such as a tipping paper, and a roll paper for a body of a tobacco rod wrapped with a tobacco rod. In the case where the filter medium is wound around the filter, the filter medium is wrapped in the wound paper to be in a rod state, and then the end portion of the winding paper in the winding direction end is overlapped with the other end portion to be adhered. The portion where the end portions of the wound paper are overlapped is referred to as a lap portion.

On the other hand, it is known that a filter with a filter cigarette is introduced into a capsule in which a fluid material is sealed, and the smoker permeates the filter material in the capsule by pressing the capsule to change the suction material during smoking. Flavor Smoke (Patent Document 1).

In Patent Document 1, it is described that at least a part of the filter assembly is covered with a non-penetrating material of a fluid material. Further, by adopting such a configuration, it is possible to prevent or solve the contamination of the leading end paper when the fluid material is released from the capsule. As the non-penetrating material of the fluid material, there is described a cellophane, a polyvinylidene chloride or a film or a sheet which is substantially impervious.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Special Table 2008-539717

The characteristics of the wound paper for a tobacco filter are required to have good moldability, adhesion of the lap portion when the filter is wound, and adhesion of the lap portion after the production. The term "formability" as used herein means that the wound paper is wound to the filter medium at a predetermined speed.

Further, when the filter material of the tobacco filter is impregnated with the water-soluble liquid, the storage stability of the water-soluble liquid which does not leak to the outside of the filter after winding is required. Further, in order to wind the filter medium which has been previously impregnated with the filter of the water-soluble liquid, it is required that the wound paper has durability against the water-soluble liquid in order to perform the winding favorably.

Conventional conventional wound paper for tobacco filters does not have all of the above characteristics.

The present invention has been made in view of such a situation, and an object thereof is to provide a wound paper for a tobacco filter which is excellent in formability, and the adhesion of a lap portion in a package filter and the lap portion after the manufacture. When it is excellent in the following, it is excellent in durability with respect to the liquid, and it is excellent in the storage stability after winding, when it is wound by the filter material which melts the filter of the water-soluble liquid previously.

In order to solve the above problems, the present invention provides a wound paper for a tobacco filter (hereinafter also referred to simply as a wound paper) which is configured to include a layer of a nonwoven fabric made of a hydrophobic fiber and having a joint between fibers, the wound paper At least one of the surface and the back surface has a contact angle with water of 90° or more and a thickness of 100 μm to 300 μm; or a layer comprising a non-woven fabric made of a hydrophobic fiber and having a joint between fibers and a gas impermeable layer At least one of the surface and the back surface has a contact angle with water of 50° or more and a thickness of 100 μm to 300 μm.

The present invention relates to the following.

[1] A wound paper for a tobacco filter comprising a layer of a non-woven fabric made of a hydrophobic fiber and having a joint between fibers, and a contact angle of at least one of the surface and the back surface of the wound paper with water is 90. Above °, the thickness is from 100 μm to 300 μm.

[2] A wound paper for a tobacco filter comprising a layer of a nonwoven fabric having a joint between fibers and a gas impermeable layer made of a hydrophobic fiber, at least one of a surface and a back surface of the wound paper The contact angle of water is 50° or more and the thickness is 100 μm to 300 μm.

[3] The winding paper for a tobacco filter according to [2], wherein the The gas permeable layer comprises a layer of polyolefin.

[4] The wound paper for tobacco filter according to any one of [1] to [3] wherein the Ra value of at least one of the surface and the back surface of the wound paper is 10 or more.

[5] The wound paper for a tobacco filter according to any one of [1] to [4] wherein the hydrophobic fiber has a fiber having a double core sheath structure.

[6] A tobacco filter comprising a wound paper for a tobacco filter 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, it is possible to provide a wound paper for a tobacco filter which is excellent in moldability, and has excellent adhesion of the lap portion when the filter is wound after winding the filter, and excellent adhesion of the lap portion after the production. When the filter medium which is previously impregnated with the filter of the water-soluble liquid is excellent in durability against the water-soluble liquid, it is excellent in storage stability after winding.

1‧‧ ‧ Cigarettes

2‧‧‧Tobacco rod

3‧‧‧ Filter paper

4‧‧‧Filter

5‧‧‧ Filter media

6‧‧‧ Winding paper

7‧‧‧Filter section

8‧‧‧hydrophobic fiber

9‧‧‧Interfiber junction

10‧‧‧ fused part

21‧‧‧ cut tobacco

22‧‧‧Roll paper for the shaft

31‧‧‧ vents

61‧‧‧Airtight layer

62‧‧‧Layer made of non-woven fabric

Figure 1 is an exploded perspective view of a cigarette of an aspect of the present invention.

Fig. 2 is a cross-sectional view showing the sheet-like wound paper before the filter section of the first aspect of the invention is packaged.

Figure 3 is a view showing a package section of the second aspect of the present invention. A cross-sectional view of the preceding sheet-like wound paper.

Fig. 4 is a schematic view showing a joint point between fibers obtained by thermally melting a hydrophobic fiber.

Fig. 5 is a schematic view showing a contact angle with water.

<first aspect>

In the first aspect of the invention, in the case of a wound paper for a tobacco filter, the wound paper is formed of a nonwoven fabric composed of hydrophobic fibers.

The hydrophobic fiber constituting the nonwoven fabric has interfiber bonding points. By having the joint between fibers, the tensile strength required for winding paper is provided, and the winding property at high speed is excellent. The term "interfiber bonding point" as used in the present invention means a point in which a plurality of hydrophobic fibers are bonded to each other via heat fusion and an adhesive.

The wound paper of the first aspect of the invention has a thickness of from 100 μm to 300 μm. When such a thickness is obtained, when a water-soluble liquid is added to the filter medium, the wound paper is buffered, and the water-soluble liquid can be prevented from leaking to the outside of the filter.

The thickness of the wound paper is more preferably 200 to 300 μm. It is preferable to prevent the water-soluble liquid from leaking from the filter medium to which the water-soluble liquid is added, and to ensure the adhesion of the lap portion for a long period of time. Further, the thickness of the wound paper of the tobacco filter is excellent in the form of a thickness of 100 μm or more. In the present specification, the moldability is excellent, and means that the wound paper is wound up to the filter medium at a predetermined speed.

In the first aspect of the invention, the layer thickness of the wound paper corresponds to the thickness of the nonwoven fabric constituting the wound paper.

Further, the "water-soluble liquid" in the present invention means a liquid containing 3% by weight or more of water. Such water soluble liquids are not associated with hydrophobic fibers.

In the present invention, the thickness of the wound paper is measured in accordance with JISP 8118 (paper and board - test method for thickness and density). The paper surface pressure system was set to 100 kPa.

The thickness of the wound paper obtained by the above measurement method is an average thickness.

Moreover, the contact angle of one of the faces of the wound paper with respect to water is 90 or more. In the wound paper of the first aspect of the present invention, by having one of the faces having the contact angle of such a range, sufficient water repellency can be ensured even in the case where the filter medium of the filter is added with a water-soluble liquid, and It prevents the water-soluble liquid from leaking to the outside.

In the case of contact with water, the measuring device uses "DROP MASTER" from Kyowa Interface Science Co., Ltd., and in terms of measurement conditions, 2 μL of droplets of distilled water are dropped into the test body at 1/2 θ. The method measures the contact angle after 0.1 second. The method of measuring the contact angle with water is also the same in the second aspect below. Figure 5 is a schematic representation of the contact angle with water.

Examples of the hydrophobic fiber system include a fiber composed of a thermoplastic resin such as polyolefin such as polyethylene or polypropylene, a thermoplastic resin such as nylon or polyester, or a composite fiber of a fiber composed of the thermoplastic resin. .

Among these, fibers using polyolefin are preferred, and fibers of polyethylene or polypropylene are more preferably used to form interfiber bonding points by heat. At the same time, the fibers can be melted at a low temperature. The molecular weight of the thermoplastic resin such as a polyolefin constituting the hydrophobic fiber is not particularly limited, but it is measured by GPC (Gel Permeation Chromatography), and the mass average molecular weight converted by the standard curve of the standard polyethylene can be cited. (Mw) is usually in the form of 20,000 to 300,000.

Further, the hydrophobic fiber may also be a fiber having a double core sheath structure. In this case, the materials constituting the outer side and the inner side are all polyolefins.

For example, it is easy to use a double core sheath structure in which a resin having a polypropylene inner side and a resin having a lower melting point than the polypropylene is used.

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 forming such a double core-sheath structure, when the interfiber bond is generated by thermal fusion, it is suitable to increase the thickness/strength of the nonwoven fabric because the heat fusion point of the fibers can be increased and the fiber shape is maintained.

The above molecular weight range can also be applied to the resin constituting such a fiber having a double core sheath structure.

The fiber diameter of the hydrophobic fiber constituting the nonwoven fabric is, for example, 0.1 to 20 dtex.

The fibers constituting the nonwoven fabric used in the second aspect of the present invention described below may be the same conditions as those of the above-described production method, resin type, molecular weight, and the like.

In the winding paper for tobacco filters, one side of the paper is not formed. The woven fabric is composed of hydrophobic fibers, whereby the contact angle of the surface with water becomes large.

By making the contact angle of any one of the surfaces of the tobacco filter with the wound paper large, it is possible to prevent the water-soluble liquid from penetrating into the inside of the wound paper for the tobacco filter, and to prevent the tobacco filter roll from being impregnated with the water-soluble liquid. Cracking or embrittlement of the paper.

A general wound paper for a tobacco filter is composed of paper made of pulp as a raw material, and constitutes interfiber bonding of the paper, and the fibers are bonded to each other by an intermolecular force and a part of hydrogen bonds. Therefore, the water-soluble liquid is impregnated into the inside of the wound paper, and the fibers are weakly bonded to each other to be broken or embrittled. On the other hand, in the present invention, there are many voids between the hydrophobic fibers, and at first glance, there is an impression that water easily penetrates, but it is composed of hydrophobic fibers and is bonded by the interfiber bonding points. Water is not easily soaked, even if it is saturated, it will not be broken or embrittled.

In the manufacture of non-woven fabrics, there are steps of forming and combining the webs. As the kind of the forming step, a carding method and a gas flow method in which short fibers are randomly stacked in the air, and a wet method in which short fibers are dispersed and copied in water are known. For the subsequent bonding step, a chemical bonding which imparts a water-soluble or water-insoluble binder by dipping or spraying; a thermal bonding by thermal fusion of a thermoplastic resin and a fiber; And mechanically, the needle-rolling complexing between the fibers is combined; and the water flow entanglement method by spraying a high-pressure water stream. Further, in terms of the method in which the forming step and the bonding step are consistently performed, a spunbond method and a melt blown method using a general technique are also exemplified. The former is heated and melted The hot plastic resin is spun to bond the long fibers, and the latter discharges the short fibers and forms a net while bonding by heat.

In the process of manufacturing a non-woven fabric, there is a non-woven fabric in which the hydrophobic fibers are thermally entangled with each other. Since the hydrophobic fibers have a fiber-to-fiber bonding point, they have durability when saturated with a water-soluble liquid, and are themselves composed of hydrophobic fibers. Therefore, it is difficult to penetrate into a water-soluble liquid.

A non-woven fabric having a punctual point formed by a water-insoluble binder of hydrophobic fibers in the process of producing a nonwoven fabric, since the hydrophobic fibers have interfiber bonding points, so that they have durability when being impregnated with a water-soluble liquid, and It is itself composed of hydrophobic fibers, so that the water-soluble liquid does not easily penetrate.

In the method of bonding the fibers to each other, since the surface roughness is easily controlled and the influence on the taste of the cigarette is small, it is preferred to use a thermal bonding method.

The surface roughness of the wound paper for a tobacco filter is preferably Ra or more. With the Ra value of 10 or more, the adhesion of the lap portion when the filter is packaged becomes good. Thereby, it is possible to prevent peeling of the succeeding surface which is wrapped in the original filter-shaped filter material lap portion, and the wound paper is peeled off from the filter medium. Ra is usually 50 or less.

The surface roughness Ra of the non-woven fabric of the wound paper can be adjusted, for example, by performing a calendering treatment after the nonwoven fabric is produced, or adjusting the fiber diameter of the hydrophobic fiber forming the nonwoven fabric, or adjusting the basis weight of the nonwoven fabric.

Further, for the Ra value of the wound paper, for example, "Surftest SJ-201 (probe R = 2 μm and front end angle 60 °) manufactured by Mitutoyo Co., Ltd." can be used, and the filter processing uses a Gaussian filter. according to The measurement was carried out according to the conditions of ISO1997 (cutoff value λ c = 2.5 mm, λ s = 8 μm, number of intervals (N) 4).

The wound paper of the first aspect of the present invention is actually air penetrating. This means that there is a gap in the wound paper, whereby the anchoring effect can be obtained when the subsequent lap joint of the filter is subsequently wound, the adhesion of the lap portion is improved, and the winding is carried out after winding the filter medium. The paper will not peel off.

The basis weight of the wound paper of the first aspect of the present invention is preferably 20 to 50 gsm. The basis weight of the wound paper of the first aspect of the present invention corresponds to the basis weight of the nonwoven fabric constituting the wound paper.

If the basis weight is in the above range, it contributes to the improvement of the water repellency of the wound paper, and at the same time, even if the filter medium is added with a water-soluble liquid, the water-soluble liquid can be prevented from leaking to the outside of the filter.

This basis weight can be adjusted by adjusting the amount of fiber supplied or adjusting the thickness of the nonwoven fabric when manufacturing the nonwoven fabric used for winding paper.

The basis weight is obtained by cutting a non-woven fabric into a square shape having a side of 10 cm, weighing it, and calculating the weight per unit area by calculation. Weighing is carried out in a 22 ° C, 60% environment for a sufficient period of time to allow the water to reach equilibrium. The second aspect below is also the same.

In the first aspect of the present invention, basically, the winding paper is formed by using a non-woven fabric separately, but may not include other structures other than the non-woven fabric, for example, including some reinforcing materials, etc., without impairing the above-described characteristics. .

<Second aspect>

A second aspect of the invention is a wound paper having: hydrophobic A layer composed of a non-woven fabric (hereinafter also referred to simply as a non-woven fabric) composed of fibers and having a layer composed of a gas-impermeable layer.

The layer of the nonwoven fabric and the gas impermeable layer are laminated so that the individual faces are opposed to each other.

In the method of laminating, a method of laminating a non-woven fabric layer and a gas-impermeable layer and applying heat thereto is carried out, and the thermoplastic resin is melted and extruded onto the film while the nonwoven fabric as a substrate is melted. The extrusion lamination method of lamination is carried out.

By providing the air-permeable layer in addition to the layer of the non-woven fabric, the effect of the above-described non-woven fabric can be obtained, and the filter medium to which the water-soluble liquid is added can be wound. Underneath, it ensures sufficient water repellency and is excellent in storage stability. The storage stability is excellent, and the water-soluble liquid does not leak out of the filter after the filter medium to which the water-soluble liquid is added is wound.

Further, even when the user presses the filter while using the filter in which the wound paper is wound, it is possible to prevent the water-soluble liquid from leaking to the outside.

The thickness of the wound paper comprising the layers is the same as the first aspect of the invention, and is from 100 μm to 300 μm.

When a water-soluble liquid is added to the filter medium, it becomes easy to cause a phenomenon in which the water-soluble liquid penetrates from the layer of the nonwoven fabric in which the cross section of the wound paper is exposed in the lap portion, and the water-soluble liquid leaks out of the filter. At this time, by making the thickness of the wound paper 100 μm or more, the wound paper is buffered, and the water-soluble liquid can be prevented from leaking to the outside of the filter.

The layer thickness of the wound paper of the second aspect of the present invention is more preferably 100 to 200 Mm. From the viewpoint of preventing leakage of the water-soluble liquid from the filter to which the water-soluble liquid is added, the layer thickness of the wound paper is preferably as thick as possible. In addition, by setting the thickness to 100 μm or more, it is possible to secure sufficient tensile strength as a wound paper for a tobacco filter, and it is excellent in moldability. The excellent formability means that the wound paper is wound up to the filter medium at a predetermined speed.

Further, the layer thickness of the wound paper of the second aspect of the present invention means the layer thickness after the layer of the nonwoven fabric and the gas impermeable layered layer are processed.

In a second aspect of the invention, the wound paper has a layer of nonwoven fabric and a gas impermeable layer, and the thickness of the wound paper is equivalent to the total thickness of the layers.

The thickness of each of the layer composed of the non-woven fabric and the gas-impermeable layer is not particularly limited, and the thickness of the layer composed of the nonwoven fabric is 50 to 290 μm, and the thickness of the gas-impermeable layer is 10 to 50 μm. Further, the thicknesses mean the thickness after being formed into a wound paper (after lamination processing).

According to a second aspect of the present invention, when the package filter material of the package comprises a water-soluble liquid, the water-soluble liquid is blocked by the gas-impermeable layer, and the layer of the non-woven fabric having a sufficient thickness can be used to ensure the long after the manufacture. The adhesion of the lap during the period.

The layer composed of the nonwoven fabric is as described above, and the same as the above-described first aspect of the present invention can be used for the type and thickness of the production method, the resin, and the like.

The air permeability of the gas impermeable layer of the present invention is 0 CU.

Moreover, the gas impermeable layer is not permeable to air, and is also incapable of penetrating water-soluble liquid. The gas impermeable layer can be confirmed by having such a property. The formability and water repellency required for the wound paper of the present invention are preserved.

The aspect of the gas impermeable layer is represented by a polyolefin, and other examples include a film containing a thermoplastic material. A film containing a thermoplastic raw material can be used by a commercially available person. For example, polyethylene, polypropylene, a copolymer of ethylene and propylene, a film of nylon or polyester can be mentioned.

The molecular weight of the polyolefin is not particularly limited, and the mass average molecular weight (Mw) in terms of a standard curve of a standard polyethylene is usually 20,000 to 300,000 as measured by GPC (Gel Permeation Chromatography).

Further, in the wound paper of the second aspect of the present invention, it is preferred that at least one of the surface or the back surface has a contact angle with water of 50 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 wound paper is excellent, and even if a water-soluble liquid is added to the filter material of the filter, there is no leakage to the outside of the wound paper, and the wound paper The case where the tensile strength is lowered.

Further, in the wound paper of the second aspect of the invention, the surface roughness of at least one of the front surface and the back surface is preferably Ra or more. By the Ra value of 10 or more, the adhesion of the lap portion becomes good. Thereby, the peeling paper can be prevented from peeling off from the filter medium.

The surface of the wound paper having the above Ra value is preferably the surface on the outer surface side of the filter. Further, it is preferable that the surface is exposed on the outer surface of the layer composed of the nonwoven fabric. In this way, when the aqueous solution penetrates into the filter medium, the water-soluble liquid is prevented from being infiltrated by the presence of the gas-impermeable layer. The paper is wound, and the adhesion of the lap portion for a long period of time becomes excellent.

Further, in the second aspect, the lap portion is formed by laminating both end portions of the winding direction of the winding paper, but may be formed by forming a surface of the layer composed of the non-woven fabric and The overlapping portion of the surface of the gas impermeable layer is adhered, or one end portion of the winding paper in the winding direction is folded to the inner surface side (filter filter side), and adhered to the surface of the layer composed of the non-woven fabric. Contact each other. Further, in the portion where the both end portions of the winding paper in the winding direction overlap, only the gas-impermeable layer is removed, and the layers composed of the nonwoven fabric are brought into contact with each other to be adhered.

The basis weight of the wound paper of the second aspect of the invention is preferably from 30 to 100 gsm. The basis weight of the wound paper of the first aspect of the present invention corresponds to the total weight of the basis of the layer composed of the nonwoven fabric and the gas impermeable layer constituting the wound paper.

When the basis weight is within the above range, it contributes to improvement of the water repellency of the wound paper, and even if a water-soluble liquid is added to the filter medium, the water-soluble liquid can be prevented from leaking to the outside of the filter.

The basis weight can be adjusted by adjusting the thickness of the layer composed of the nonwoven fabric constituting the wound paper and the gas impermeable layer.

The wind paper of the present invention is preferably a 27,000 to 45,000 CU (CORESTA Unit), regardless of whether it is the first aspect or the second aspect, and the layer of the nonwoven fabric constituting the wound paper. By having such a degree of ventilation, there is a sufficient gap between the fibers of the nonwoven fabric, and by providing an appropriate surface roughness, the adhesion to the filter medium becomes good.

The degree of air permeability can be adjusted, for example, by adjusting the fibers of the nonwoven fabric. The type, the thickness of the fiber, the amount of the fiber, and the thickness of the nonwoven fabric are adjusted.

In the second aspect of the present invention, the air permeability of the wound paper of the second aspect is made zero by winding the gas impermeable layer of the paper.

The air permeability referred to in the present invention is a flow rate of air which is ventilated (penetrated) every 1 minute and ‧ cm ² when air is passed through a single surface (2 cm ² ) of paper at a constant pressure of 1 kPa.

In a second aspect of the present invention, basically, the non-woven fabric and the gas-impermeable layer are formed into a wound paper, but the nonwoven fabric and the gas-impermeable layer may be included as long as the characteristics described above are not impaired. For example, some reinforcing materials, etc.

<Cigarette example>

Fig. 1 is an exploded perspective view showing an aspect of the filter cigarette 1 using an example of the wound paper of the present invention. The cigarette 1 includes a tobacco rod 2, and a cigarette attached to the filter 4 connected to the filter paper 3 at one end of the tobacco rod 2.

The tobacco rod 2 is formed by winding the shredded tobacco 21 into a cylindrical shape (rod shape) by winding the rod body 22 with a roll paper 22 . The filter 4 is configured to filter the components of the smoke component contained in the mainstream smoke when the mainstream smoke generated during smoking passes through the cigarette 1, and is actually formed into a cylindrical shape having the same diameter as the tobacco rod 2.

The filter 4 is wound by the filter paper 3, and is connected to the rear end side of the tobacco rod 2 via the filter paper 3. The filter paper 3 is connected by integrally winding the end of the tobacco rod 2 with the filter 4. In the area of the filter paper 3 covering the filter 4, it is worn to be diluted The outside air (air) of the mainstream smoke is introduced into the vent hole 31 in the filter 4. The vent hole 31 is an external air introduction hole for ventilation, and a plurality of filter papers 3 are provided. The air introduced by the vent hole 31 of the filter paper 3 dilutes the mainstream smoke passing through the filter 4. Further, the vent hole 31 of the filter paper 3 is not necessarily required, and the arrangement of the vent hole 31 can be appropriately changed. When the wound paper is composed of one layer of a nonwoven fabric having a ventilating property as the first aspect, the vent hole 31 may be provided only in the filter paper 3. Moreover, when the wound paper system includes a layer having a gas impermeable layer as in the second aspect, a vent hole may be provided in the winding paper corresponding to the position of the vent hole 31 provided in the filter paper 3, thereby introducing the diluted mainstream smoke. Air used.

The filter 4 is, for example, a filter section 7 having a filter material 5 such as a cellulose acetate tow wound by a wound paper 6 of the present invention.

The first aspect of the present invention (Fig. 2) and the second aspect (Fig. 3) can be used as the wound paper 6. When the second aspect is used, it is preferable to carry out the roll by using the layer composed of the non-woven fabric as the outer surface side from the viewpoint of securing the adhesion of the lap portion of the wound paper after the package or the package. Wrap around.

The method of winding the filter medium 5 using the wound paper 6 can be carried out by a known hoist or the like, and the filter medium 5 can be wrapped by using a known adhesive and then winding the lap portion of the paper.

The filter medium 5 of the filter section 7 of the present embodiment includes a state in which a water-soluble liquid is added. The water-soluble liquid system contains propylene glycol (PG), glycerin (G), water, or the like described below. Further, the filter section 7 is also referred to as the filter of the present invention.

<Water-soluble liquid added to the filter medium>

The wound paper of the present invention is a filter material that can be used for winding a filter. The wound paper of the present invention is suitable for winding a filter material of the wound filter with a water-soluble liquid containing propylene glycol, glycerin or water.

The water-soluble liquid of the filter medium to be added to the filter is not particularly limited, and may be an additive containing various fragrances or the like in addition to propylene glycol, glycerin, water, or the like as described above.

By including propylene glycol in the solution added to the filter section 7, the predetermined component contained in the smoking cigarette can be selectively removed during smoking, for example, the phenol is removed, and one of the aroma components is not removed. The limonene is passed through the filter 4. Further, by including glycerin in the solution added to the filter section 7, the propylene glycol contained in the solution can be prevented from volatilizing and disappearing during storage of the cigarette. Further, propylene glycol and glycerin can be used commercially.

The weight ratio of propylene glycol, glycerin, and water in the water-soluble liquid added to the filter medium is not particularly limited. When the filter cigarette is used in a general range of 24.0 to 25.0 mm, it is filtered by a filter cigarette. The amount of the filter medium to be added may, for example, be 10 to 100 mg/filter of propylene glycol, and may be exemplified by a glycerol content of 1 to 150 mg/filter, and water may be 5 to 100 mg/filter. The state of the device.

Further, the solution added to the filter section 7 may also contain a tackifier. The type of the tackifier can be used as long as it is dissolved in propylene glycol and glycerin and water, and is not particularly limited, and for example, Sanxian gum, ylang gum, psyllium seed gum, pectin, carboxymethyl cellulose, hydroxypropyl cellulose, polyvinyl alcohol, agarose, polytriglucose, alginic acid, polyacrylic acid and these alkali metals Salt and even alkaline earth metal salts.

The amount of the water-soluble liquid to be added to the filter medium is not particularly limited, but in principle, when a filter cigarette having a circumference of 24.0 to 25.0 mm is used, the amount of the filter medium added to the filter cigarette can be enumerated as 10 Up to 300mg/filter.

Fig. 3 is a view showing a second aspect of the sheet-like wound paper 6 before the package section 7 of the first embodiment. The wound paper 6 is formed on the other surface of the layer 62 composed of the nonwoven fabric to form the gas impermeable layer 61. Further, the wound paper 6 is wound around the filter section 7 so that the layer 62 made of the nonwoven fabric faces the outer peripheral surface of the filter medium 5 and becomes the outer surface. The gas impermeable layer 61 of the wound paper 6 is a layer in which the film shape described above is brought into contact with the layer 62 composed of the nonwoven fabric.

[Examples]

The present invention will be more specifically described by the examples, but the present invention is not limited to the description of the present invention as long as it does not depart from the gist of the present invention.

<Example>

In the following tests, the physical properties (design), paper properties, and mechanical properties (formability), water repellency (impact durability) of various samples, peel strength of the rolled up of the actual machine (adhesion of the lap joint), and leakage The degree (storage stability) was measured.

The samples used in the test are described below.

<Winding paper test article>

For the comparative example, a generally used wound paper (paper whose main component is wood pulp), a polypropylene film (air impermeable film), and a cellophane film (high density cellulose) were used.

In the wound paper of the present invention, a nonwoven fabric using polyethylene as a hydrophobic fiber as shown in Table 1 and a polyethylene film laminated on the nonwoven fabric were used. Any non-woven fabric has interfiber bonding points generated by thermal fusion.

Further, in the wound paper used in Example 2, the thickness of the nonwoven fabric was 145 μm, and the thickness of the polyethylene film was 20 μm. In the wound paper used in Example 4, the layer thickness of the nonwoven fabric was 220 μm, and the thickness of the polyethylene film was 20 μm. In both of the second embodiment and the fourth embodiment, when the nonwoven fabric and the polyethylene film are laminated, pressure is applied. Therefore, the thickness after the lamination processing is reduced as compared with the total thickness of the nonwoven fabric and the polyethylene film before the lamination processing. The thickness of the wound paper after lamination of Example 2 was 126 μm, and the thickness of the wound paper after lamination of Example 4 was 194 μm.

<Test bench test method>

Among the items shown in Table 1, the thickness, the surface roughness (Ra), and the contact angle with water were measured by the following methods.

1. Paper physical property assessment Ii) thickness

The paper was tested according to the test method of paper and board-thickness and density of JISP8118. The paper surface pressure was 100 kPa.

Ii) roughness

‧Measurer The "Surftest SJ-210" manufactured by Mitutoyo Co., Ltd. was used.

(R=2μm at the front of the probe and 60° at the front end)

‧Filter processing Gaussian filter

‧Measurement conditions are in accordance with ISO1997.

(cut-off value λ c = 2.5 mm, λ s = 8 μm, number of intervals (N) 4) iii) contact angle

‧Measurer "DROP MASTER" of Gonghe Interface Science Co., Ltd.

‧Measurement conditions 2 μl of droplets of distilled water were dropped into the test body to 1/2 θ method measures the contact angle after 0.1 seconds

Iv) basis weight

The basis weight was obtained by cutting a non-woven fabric into a square shape having a side of 10 cm, and weighing was performed, and the weight per unit area was calculated by calculation. Weighing is carried out in a 22 ° C, 60% environment for a sufficient period of time to allow the water to reach equilibrium.

2. Water resistance evaluation (surface water repellency screening)

In a petri dish, a combination of filter paper of the same size was placed under a 6 cm square test piece, and 2 g of distilled water filled with a red pigment was placed on the upper surface of the test piece, and the seal was quickly capped. After 73 hours, the filter paper below was observed, and it was judged as "no water repellency ×" for the red pigment on the filter paper which was caused by the liquid leakage, and it was judged as "△" if it was less than 1 cm, and red could not be seen. It is judged as "waterproof ○".

This "water repellency" affects the durability of the wound paper, and the water repellency is better. The higher the durability.

<Practical test method>

Each of the wound papers shown in Table 1 below was rolled up the filter medium using a filter winder. At this time, confirm the maximum number of rotations that can be stably rolled up. Further, it was confirmed that the peel strength of the lap of the filter after storage and the degree of water absorption and leakage to the outer surface of the wound paper. The storage was carried out by sealing it in a transparent plastic bag after being rolled up, and placing it at a temperature of 23 ° C and 60%. In addition, in the sample which is a laminated surface, it is rolled up so that the laminated surface may become the inner side (tow side) at the time of winding up.

<Specification of water-soluble liquid added to filter medium>

Since water alone is used for steaming, it is practical to use a mixture of propylene glycol, glycerin and water.

‧Filter material for filter media 6y35000

‧Addition solution (propylene glycol: glycerol: water) = 50:25:25 (w/w/w) (add a trace amount of coloring agent to confirm the presence or absence of leakage)

‧Adding amount of 50mg/10mm filter

(1) Peel peel strength (adhesion of the lap joint)

For the wound paper of the prepared filter, the opposite side of the lap portion is cut in parallel with the lap adhesive tape.

The front end of the lap portion of the cut paper which was cut out was slightly peeled off by hand to form a grip portion. Each gripping portion is attached to a peeling test machine and implemented at 180 degrees. Peel test. The measurement result is an average value of the central value from the start of measurement to 40 mm of the obtained repeated five times in units of g.

The measurement result was less than 15 g, and 15 g or more was ○.

(2) Water absorption/leakage of the wound paper (after 1 day and after 10 days)

It is judged by the degree of red coloration of the entire wound paper and the color shifting state when the surface is pressed against the paper. The result is the storage stability after winding of the wound paper.

[degree of leakage]

×: The entire surface of the wound paper (almost 100%), △: partial leakage, ○: slight leakage, ◎: none

(3) Filter winding speed

Hoist rated power performance Relative to 3300 rpm, the current pan-products target 1500 rpm. The roll-up at 1500 rpm is excellent in formability.

The results of measurement under the above conditions are shown in Table 1 below.

The samples described in the following Tables 1 and 2 will be briefly described below.

Comparative Example 1 (plain paper): A wound paper made by papermaking using pulp as a material.

Comparative Example 2 (high air permeability paper): a wound paper obtained by mixing enamel and pulp.

Comparative Example 3 (cellophane): a film-like wound paper obtained by using a mucus.

Comparative Example 4 (film laminate-paper): paper made by using paper pulp paper A wound paper of a single-layer layer of a film composed of polyethylene.

Comparative Example 5 (film laminate-paper-film laminate): a wound paper obtained by using a film made of polyethylene in a double-area layer of paper prepared by using paper pulp.

Example 1 (Olefin PPPE 25): A wound paper obtained by using a non-woven fabric (basis weight: 25 gsm) obtained by using a polypropylene core having a double core sheath structure fiber made of polyethylene as a hydrophobic fiber.

Example 2 (Olefin PPPE25 film laminate): a non-woven fabric (basis weight 25 gsm) laminated polyethylene film obtained by using polypropylene having a polypropylene inner side and a double core sheath structure fiber made of polyethylene as a hydrophobic fiber Winding paper.

Example 3: (Olefin PPPE 40): A wound paper obtained by using a non-woven fabric (basis weight: 40 gsm) obtained by using a double core-sheath structure fiber made of polyethylene on the outer side and polypropylene as a hydrophobic fiber.

Example 4 (Olefin PPPE40 film laminate): a wound paper obtained by using a non-woven fabric (basis weight 40 gsm) laminated polyethylene film obtained by using a polypropylene core on the inner side and a double core sheath structure fiber made of polyethylene on the outer side. .

<Results and investigation>

Comparative Example 1 is a wound paper made of so-called general-purpose paper (plain paper) composed of fibers mainly composed of wood pulp. Because it is used in a wide range, the winding machine can be operated at a high speed, but the contact angle with water is low and it is easy to wet. Therefore, the hydrophilic binding portion of the main body is liable to collapse, and as a result, peeling occurs.

Comparative Example 2 is a high-circulation wound paper comprising a fiber having a main component of wood pulp and a recycled fiber. In order to improve water resistance Since it is coated with a medicine, although it has a void structure, the initial contact angle with water is very high and water is dialed. Moreover, the surface roughness is also sufficient, and it can also be operated at a high speed.

However, as the time passes, the water-soluble liquid slowly infiltrates into the hydrophilic bonding portion between the fibers, and the thickness of the buffer region which becomes the water-soluble liquid is 55 μm which is insufficient, so that collapse and liquid leakage eventually occur. The liquid amount in the additive filter of this example is evaluated as Δ after one day of storage, and it can be regarded as a practical limit. In order to use it more safely, it is preferable to further improve the water repellency of the net itself, and the thickness is 55 μm or more.

Comparative Example 3 was actually a cellophane (cellulose film) having a barrier function which was constructed without voids allowing water and air to pass through. In spite of this, it is known that it has a high hydrophilicity due to a low contact angle with water, and it swells and collapses with time. Further, since there is almost no surface roughness, sufficient joint strength cannot be obtained in the lap portion, and therefore it is difficult to perform the winding up by the usual setting. Although it is assumed that a water-repellent effect can be obtained by applying a water-resistance agent, it is still unpractical.

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. It is non-ventilating and has a hydrophobic surface. Therefore, it has sufficient water resistance at the test bench. However, although both sides have the thickness of the ordinary paper grade, the barrier effect of the laminated surface is high and the penetration of the adhesive is also limited, so the running speed is slightly lower than that of the pulp, and it is waterproof as an important filter. Weak and unfeasible. This is because, even if the laminated surface becomes the inside of the filter, water is infiltrated by the pulp cross section of the lap portion (adjacent portion) of the wound paper, and is diffused from the place to the surface. Therefore. Moreover, since the adhesion force is lowered, the peel strength is also out of the practical range.

Comparative Example 5 is a wound paper having a structure in which a double-sided layer of Comparative Example 1 is laminated with a water-repellent olefin (polyethylene). In the same manner as in Comparative Example 4, it was not ventilating, and the laminated surface was hydrophobic, so that the water resistance of the test bench was sufficient. However, since both sides are significantly restricted by the penetration of the glue, the running speed is lower than that of Comparative Example 4. Although the water repellency as a filter cannot be said to be sufficient, it is still higher than that of Comparative Example 4. However, the point at which the peel strength was lowered was the same as in Comparative Example 4, and was not a practical grade.

The difference between Examples 1 and 3 lies in the thickness of the nonwoven fabric which is composed of a double core sheath structure fiber having a polypropylene inside and a polyethylene as an outer side as a hydrophobic fiber. Since the wound paper of any of Examples 1 and 3 has a sufficient surface roughness, the lap portion exhibits a strong adhesive force and can be operated at a high speed. The layer having the polyolefin fiber has a high contact angle with water and has a void structure in which water and air easily pass through, so that high water repellency is exhibited.

However, since a certain pressure is applied during the molding of the filter, water is pressed into the through hole. At this time, the thickness is increased as in Example 3 to impart a buffer region to the water-soluble liquid, whereby the water repellency can be further improved. Further, sufficient peel strength can be obtained by the effect of bonding between water-resistant fibers and a very large surface roughness.

In order to provide more sufficient water repellency, the single-sided lamination of the non-woven fabric of the double core-sheath structure fiber which is made of polypropylene and the outer side is made of polyethylene shown in Examples 2 and 4 is processed with a polyethylene film. It is effective as a gas impermeable layer. Embodiments 2 and 4 are at least such that compared with Comparative Example 4. The surface roughness Ra of the single surface was much larger than the surface roughness Ra of the single surface of Comparative Example 4, and the sufficient adhesion of the lap portion was exhibited, and the same level as that of Comparative Example 1 was able to be operated. If the double-sided lamination is performed, the operation speed is lowered as in the case of Comparative Example 5, and thus it is not recommended. In terms of water repellency, since the pressure problem at the time of molding is removed by removing the through-hole, and water-resistant interfiber bonding is provided, long-term quality can be ensured, and although the peel strength is slightly lower than that of Examples 1 and 3, The range that can be fully utilized.

62‧‧‧Layer made of non-woven fabric

Claims (8)

A wound paper for a tobacco filter comprising a layer of a non-woven fabric made of a hydrophobic fiber and having a joint between fibers; a contact angle of at least one of a surface of the wound paper and the back surface with water is 90° or more, The thickness is from 100 μm to 300 μm. A wound paper for a tobacco filter comprising a layer of a non-woven fabric made of a hydrophobic fiber and having a joint between fibers, and a gas impermeable layer; contact of at least one of the surface and the back surface of the wound paper with water The angle is 50° or more and the thickness is 100 μm to 300 μm. The wound paper for a tobacco filter according to claim 2, wherein the gas impermeable layer is a layer made of a polyolefin. The winding paper for a tobacco filter according to any one of claims 1 to 3, wherein at least one of a surface and a back surface of the wound paper has an Ra value of 10 or more. The wound paper for a tobacco filter according to any one of claims 1 to 4, wherein the hydrophobic fiber has a fiber having a double core sheath structure. A tobacco filter comprising the wound paper for a tobacco filter 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 of claim 6 or 7, and a tobacco rod.