JP2001159097A - Filter-wrapping paper for cigarette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide filter-wrapping paper having high air permeability which can impart a filter plug preventing the exudation of a hot-melt paste, reducing the occurrence of troubles in a filter-producing process and a filter-tipped cigarette-producing process, sparingly causing the nap and falling of fibers from the surface of the wrapping paper, having a smooth surface and excellent in slidability. SOLUTION: This filter-wrapping paper which is a mixed paper having at least three layers, has surface and underside layers made mainly of cellulose fiber and laminated on both sides of a layer comprising chemical fiber by making mixed paper and has an air permeability of >=4,000 Coresta Units is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a filter paper for cigarettes. More specifically, when a filter plug for cigarettes is wound up, a filter with high air permeability that can prevent troubles in a filter manufacturing process and a cigarette manufacturing process with a filter caused by oozing out of a hot melt paste used through a filter winding paper. About.

[0002]

2. Description of the Related Art In recent years, in order to respond to the demand for mildly-tasting cigarette products, a filter portion in which activated carbon is dispersed is provided, or a large number of ventilation holes are provided in a mouth portion of the tobacco to allow inflow during suction. Ambient air has also been used to reduce taste, but the trend has been increasing, and the production of filter plugs using filter paper with even higher air permeability has been increasing, and commercial cigarettes have been used. Among them, the air permeability is 5000
As described above, in particular, those manufactured using filter wrapping paper having a high air permeability of 10,000 or 30,000 can be seen.

Generally, in order to increase the air permeability of paper, rigid pulp fibers lightly beaten are used, or a filler is internally added to inhibit the bonding between fibers to reduce the number of voids inside the paper sheet. Although the air permeability is increased and the pore diameter is increased, the high air permeability as in the above-mentioned filter paper cannot be achieved only by adjusting the conditions of the beating treatment or the amount of the internal filler, and thus the rayon fiber Blending chemical fibers such as acrylic fiber, polyester fiber, nylon fiber, polyolefin fiber, etc. with softwood pulp to make a mixed stock,
Furthermore, high permeability is realized by replacing part of the softwood pulp with Manila hemp pulp, esparto pulp, and sisal pulp, which are easily breathable.

[0004] However, the above-mentioned highly permeable filter wrapping paper has a large pore diameter and many pores penetrating from the front surface to the back surface of the sheet, so that hot melt paste used for winding a filter plug for tobacco is not used. Troubles in the filter manufacturing process and the tobacco manufacturing process with the filter caused by oozing out of the filter through the filter wrapping paper are constantly occurring, and there is a strong demand for improvement.

[0005] The highly permeable filter wrapping paper includes:
Since chemical fibers are blended, these fibers are likely to fluff or fall off from the surface of the paper roll, and there is a need for a countermeasure. For example, polyvinyl alcohol (PVA) -based binder fibers, thermoplastic composite fibers having surface heat-fusing properties, etc. Although fluffing and falling off of the chemical fiber are suppressed by blending or applying PVA or starch to the surface, a sufficient effect is not obtained.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention is intended to prevent the bleeding of hot melt glue, reduce the occurrence of troubles in the filter manufacturing process and the process of manufacturing tobacco with a filter, and at the same time, reduce the fuzziness of fibers from the surface of the web. It is an object of the present invention to provide a highly breathable filter wrapping paper from which a filter plug which has a small amount of falling-off, has a flat surface and good slipperiness can be obtained.

[0007]

In order to solve the above-mentioned problems, the present inventors have developed coniferous kraft pulp (NBKP).
Even if the sheet is made by beating paper to some extent, the basis weight is 10 g /
As further thinning of m ^2, 10000 to 1,000
Since the air permeability was so high as to reach 00 coresta units, NBKP, in which the pore diameter between the fibers was relatively small, was beaten into a layer containing rayon fibers and having a high air permeability to obtain 1 layer.
As a result of intensive studies on the air permeability and the bleeding out of the hot melt glue of the sheet formed by laminating two or more layers, the NBKP layer was one layer laminated on the rayon fiber-containing layer, and the result was as follows. The inventors have found that when the layer is divided into three layers by laminating on both sides of the rayon fiber-containing layer, the air permeability is higher and the bleeding of the hot melt paste is reduced, and the present invention has been completed.

[Experimental example] [Preparation of raw material for papermaking] Commercially available manila hemp pulp 20% by mass beaten to freeness CSF722, rayon fiber (Rayon SB (3d × 5mm) manufactured by Daiwabo Rayon Co., Ltd.) 7
0% by mass, polyvinyl alcohol (PVA) -based binder fiber (manufactured by Kuraray Co., Ltd., VPB107, 1d × 3m)
m) 10% by mass was mixed to prepare a papermaking raw material slurry for the rayon fiber-containing layer.

Next, a commercial softwood bleached kraft pulp (NBKP) beaten to a freeness CSF 409 was added to an alkyl ketene dimer (AKD) sizing agent (Arakawa Chemical Industries, Ltd.).
Made, size pine K901) and polyamide resin (Japan P
MC Corporation (RD805) was added in an amount of 0.4% by mass (solid content / solid content) and 0.1% by mass (solid content / solid content) to prepare a papermaking raw material slurry for the NBKP layer.

[Preparation of laminated paper] (Laminated paper 1) The raw material slurry of the NBKP layer papermaking material was weighed 10 g / m ² using a TAPPI standard circular handsheet machine.
A considerable amount was collected, a wet sheet was formed on a wire according to a standard method, coated, and adhered to filter paper. Next, a rayon layer papermaking raw material slurry was sampled corresponding to a basis weight of 11 g / m ² , a wet sheet was similarly formed on a wire, and the NBKP layer previously attached to the filter paper was overlaid and coated, followed by wet pressing. And dried to produce a two-layer laminated paper. (Make-up paper 2) NBKP layer A paper-making raw material slurry corresponding to a basis weight of 3 g / m ^{2 was} collected, a wet sheet was formed on a wire, coated and adhered on a filter paper, and N
A BKP layer papermaking raw material slurry was collected corresponding to a basis weight of 7 g / m ² , a wet sheet was formed on a wire, coated and coated with two types of NBKP layers attached on filter paper, and then a rayon layer papermaking raw material slurry was prepared. Was collected on a wire having a basis weight of 11 g / m ² , and a wet sheet was formed on a wire in the same manner, and NBK having a basis weight of 7 g / m ² previously attached on filter paper.
After the P layer is overlaid and coached, the previously prepared basis weight 3
After the NBKP layer of g / m ² was overlaid, wet press and drying were performed to produce a three-layer laminated paper having a rayon layer as an intermediate layer. (Material 3) 5 g / m ² and 5 g / m ^{2 of} NBKP layer
except that the m ² was prepared combination papers of three layers in the same manner as combination papers 2.

[Comparison of laminated paper] The above three types of laminated paper were compared in terms of basis weight, air permeability, and hot-melt paste penetration prevention. (Hot melt glue penetration prevention) JAPAN TAPP
I No. 51-87 Using a liquid absorption measuring device manufactured by Tokyo Micron Co., Ltd., which is a measuring device of the liquid absorption test method for paper and paperboard (Bristow method), a light-weight coat having a width of 30 mm on a rotating wheel having a circumference of 1 m. Hot melt with 0.5% oil-soluble dye (Oriental Chemical Co., Ltd. Oil Blue 2N) added to a head box with a slit length of 10 mm and a slit width of 1 mm. Glue (Daikaraku S-, manufactured by Daido Chemical Co., Ltd.)
1101S) 0.1 g was added, and the mixture was heated and melted at 160 ° C., and the speed corresponding to a contact time of 0.06 seconds 15.72 mm
/ Sec. Rotate the wheel with to permeate through the sample and reach the surface of the lightweight coated paper 0.1 mm ×
Count the number of hot melt pastes of 0.1 mm or more,
Those expressed in number per area 200 mm ^2, is to evaluate the high penetration inhibiting properties the fewer number. Basis weight Air permeability Prevention of glue penetration (g / m ² ) (Cholesta unit) (pieces / 200 mm ² ) Laminated paper 1 (0/11/10) 20.86 4820 14.8 Laminated paper 2 ( 3/11/7) 21.56 17780 4.4 Laminated paper 3 (5/11/5) 20.61 25090 5.0 If the rayon layer is the same, the NBKP layer is two layers more than one layer. Has a higher air permeability and a clear increase in the ability to prevent the penetration of glue.

That is, according to the present invention, in a tobacco filter wrapping paper which is formed into at least three layers, a surface layer and a back layer mainly composed of cellulose fibers are formed on both sides of the layer containing chemical fibers. A filter paper for cigarettes having an air permeability of 4000 Coresta units (CU) or more, which is laminated by lamination, is provided. In addition,
In the present invention, when used as a filter winding paper, the back layer is a layer located inside a completed cylindrical filter plug, and the front layer means a layer located outside.

Further, according to the present invention, there is provided a cigarette filter wrapping paper characterized in that the surface layer and the back layer have the same basis weight.

Further, according to the present invention, there is provided a cigarette filter wrapping paper characterized in that the basis weight of the front layer is smaller than the basis weight of the back layer.

In the present invention, the tobacco filter wrapping paper preferably has an air permeability of at least 7000 Coresta units.

In the present invention, the tobacco filter wrapping paper preferably has an air permeability of at least 9000 Coresta units.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a layer containing chemical fibers (hereinafter referred to as "intermediate layer") is bulky and has a relatively large pore diameter in a sheet in order to ensure high air permeability. And a sheet density of 0.2 to 0.35 g /
cm ³ . As fibers constituting the layer, various combinations of fibers are used in consideration of bulkiness, papermaking properties, and sheet strength. In order to obtain bulkiness, chemical fibers such as semi-synthetic fibers such as rayon and lyocell, acetate, nylon, vinylon, acrylic and polyester (PE
T), polyethylene (PE), polypropylene (PP)
Synthetic fibers such as fibers and composite fibers thereof, and synthetic fibers having crimpability are used. Some of these produce adhesion between fibers due to heat in the drying zone of the paper machine. As these fibers, those having 1 to 20 denier can be used, and those having 2 to 5 denier are preferable. In order to enhance papermaking properties, wood pulp, non-wood pulp and the like that are usually used for papermaking can be used,
Non-wood pulp which is relatively easily bulky, for example, pulp fibers such as manila hemp, sisal hemp, kenaf, esparto and roselle, and wood pulp are preferably mercerized pulp and thick-walled southern pulp. It is preferable to treat these pulp as lightly as possible to obtain bulkiness.
It is beaten at F650 or more. If necessary, a suitable amount of fibers for generating inter-fiber bonds such as polyvinyl alcohol (PVA) -based binder fibers, composite fibers, and thermoplastic synthetic fibers is used. These fibers are 50 to 80% by mass of a fiber for obtaining bulkiness, and 2% of a fiber for improving papermaking property.
It is blended in the range of 0 to 50% by mass. When using a binder fiber, it is blended at a ratio of 3 to 15% by mass of the fiber content of the entire intermediate layer including the binder fiber. In addition to these fibers, if necessary, materials usually used for papermaking, such as a paper strength enhancer, a sizing agent, a slime control agent, and an antifoaming agent, can be added.

The basis weight of the intermediate layer is appropriately adjusted depending on the thickness and air permeability as a filter paper roll, and is not particularly limited, but paper is made in the range of 10 to 25 g / m ² . Practical preferably 10 to 20 g / ^{m 2} to, more preferably 10 to 15 g / ^{m 2.} Although a short net or circular net paper is made, a short net is preferred in order to obtain high air permeability and bulkiness.

The air permeability of the intermediate layer is 50,000-3500
Although it can have a range of 00 Coresta units, in order to obtain high air permeability, 80,000 to 350,000 Coresta units are preferable, and 150,000 to 350,000 Coresta units are more preferable. In the present invention, the intermediate layer is not limited to one layer as long as the above conditions are satisfied.

In the present invention, the surface layer and the back layer mainly composed of cellulose fibers (hereinafter referred to as "surface layer") are layers containing no chemical fibers and are formed on both sides of the intermediate layer. Small pore size and density 0.2-0.6g / c
It is in the range of m ^3. Since the surface layer is formed as two layers with an intermediate layer interposed therebetween, when used as a filter winding paper, a layer located inside (a back layer) and a layer located outside (a front layer) of the completed cylindrical filter plug. Then the role is slightly different. Since the back layer is coated with hot melt glue, the first function is to prevent the penetration of the glue. For this reason, wood pulp fibers whose pore diameter is liable to be small are used, and even when other fibers are used, they are adjusted by beating treatment and used. On the other hand, since the amount of glue permeating through the back layer and the intermediate layer is smaller than the amount applied, the permeation prevention function required for the front layer is slightly lower than that of the back layer. A function that can prevent fluffing and falling off of the chemical fiber is required. The glue penetration preventing function required for the surface layer depends on the penetration preventing function for the back layer.
For example, if the permeation prevention function of the back layer is so high that the glue does not reach the surface layer, the permeation prevention function of the surface layer is not necessary,
It is only necessary to form a layer that can cover the surface to such an extent that the fibers can be prevented from fluffing and falling off from the intermediate layer.
In addition, if the penetration preventing function of the back layer is not so high and the paste reaches the surface layer, the surface layer also needs the penetration preventing function. How to form the surface layer and the back layer is determined in consideration of the air permeability required for filter paper, the function of preventing the penetration of glue, and the function of preventing fuzzing and falling off of the fiber. It can be performed by adjusting the type, blending ratio, degree of beating treatment, basis weight and the like. The basis weight of the surface layer including the front layer and the back layer is 10 to 15 g / m.
² is preferred. If it is less than 10 g / m ² , it is difficult to obtain a sufficient adhesive permeation prevention property, and if it exceeds 15 g / m ² , it is difficult to obtain high air permeability. For the surface layer, those commonly used for papermaking such as wood pulp and non-wood pulp can be used, and cellulose fibers such as pulp such as softwood pulp, hardwood pulp, manila hemp, sisal hemp, kenaf, esparto and roselle are used. The surface layer contains no chemical fibers, and the cellulose fibers used are entangled with each other and bonded to each other. Therefore, the risk of fluffing or falling off of the fibers is extremely reduced.

The back layer is used for manufacturing a filter.
It is a layer for suppressing the penetration of the applied hot melt glue and preventing the hot melt glue from seeping out from the surface of the web, and it is necessary to make the pore diameter smaller than that of the intermediate layer. In addition, although it is a back surface layer, it must have high air permeability and must have a balance with the function of preventing the penetration of glue. Therefore, softwood pulp, hardwood pulp, cotton pulp, linter pulp, flax pulp or non-wood fiber pulp used in the middle layer, for example, pulp such as Manila hemp, sisal hemp, kenaf, esparto, roselle, etc. are used alone or in combination of two or more. In order to form a smaller pore size, the freeness C
It is preferred to use softwood pulp of SF 350-500. Further, a paper strength enhancer, a sizing agent, a filler, an antifoaming agent, and other papermaking additives can be added to the paper material for the back layer as needed. Circular mesh or short net paper is made at a basis weight of 5 to 10 g / m ² , but a circular mesh is preferable to obtain a smaller pore diameter. If the thickness of the back surface layer exceeds 10 g / m ² , the air permeability decreases, which is not preferable. In addition, 5 g / m ²
If the amount is less than the above, the ooze of the paste increases, which is not preferable. The air permeability of the back layer is in the range of 10,000 to 100,000 Coresta units.

[0022] The surface layer is made of fluff of chemical fibers in the intermediate layer.
A function that can prevent standing and falling off is required.
Slightly lower hot melt glue penetration prevention required
In some cases, the pore diameter includes a range larger than that of the backside layer.
I will. The surface layer must have higher air permeability.
The surface layer itself and the backside layer
A balance is needed. So softwood pulp, broadleaf
Tree pulp, cotton pulp, linter pulp, flax pulp
Non-wood fiber pulp used for the
Leek hemp, sisal, kenaf, esparto, roselle, etc.
Pulp used alone or in combination of two or more
Can be. The stock for the surface layer includes a paper strength enhancer,
Oiling agents, fillers, defoamers, and other papermaking additives
Can be blended. Do not complicate the manufacturing process
To have the same configuration as the backside layer,
It is possible to lower the value, which is a preferable embodiment. surface
Layer is 1-7.5 g / m² Paper, but the
5 to 7.5 g / m depending on the amount ² Or 3 to 7.5 g
/ M² In the basis weight range. Circle net
Or short-mesh papermaking, but emphasizes the function of preventing the penetration of glue
In this case, a circular net is preferred. The surface layer has a basis weight of 1 to 7.5 g /
m² Is preferred, and 7.5 g / m² Beyond the fiber hair
The effect of preventing feathering and falling off does not change and the decrease in air permeability is large
It becomes. The air permeability of the surface layer should not exceed 40,000 Coresta units
Will be on top.

[0023] In the case of handsheet, at a 5 g / m ² or less difficult to obtain as the sole sheet, can not be measured even air permeability of the surface layer itself, as described below by experiments a surface layer of 1 to 7 g / m ² Confirmed. That is, freeness CS
Commercially available NBKP beaten to F450 and direct cationic dye for paper pulp (Kayacel Blu manufactured by Nippon Kayaku Co., Ltd.)
e CF Liquid) was added to 5% by mass of pulp to prepare a dyed fiber. After separating and dissolving the dyed fiber, a white paper-making plastic wire was mounted on a wire mesh.
The paper was formed using an APPI standard circular hand maker, and formed on a white paper-making plastic wire.
A 7 g / m ² wet sheet was taken out together with a white paper-making plastic wire, a heat-resistant plastic film was placed on the fiber surface, and then wet-pressed between filter papers according to a conventional method to obtain a plastic film-fiber layer. -The plastic sheet was dried with a cylinder drier while the plastic wire was piled up, and an experimental sheet was prepared except for the plastic film. The sheet formed on the plastic wire is placed on an optical stage, and a dot analyzer DA manufactured by Oji Scientific Instruments is passed through a CCD camera with an optical microscope (0.75 objective lens) under reflected illumination.
Filtering and binarization were performed at -500S to perform image processing. The area occupied by the dyed fibers occupying an area equivalent to 64 mm × 48 mm of the test object was represented by the coverage area ratio, and the same process was repeated to obtain an average of a total of 10 visual fields, which was defined as the sheet coverage area ratio. The coverage area ratio of the sheet of each grammage is as follows: basis weight 1 g / m ² coverage area ratio 12.9% 3 g / m ² 35.7% 5 g / m ² 52.5% 7 g / m ² 77.2 From the above, the range of low basis weight, which is difficult to obtain as a single sheet as described above, was also defined as the surface layer of the laminated paper of the present invention, and its function was confirmed.

The filter paper for cigarettes of the present invention having at least three layers is produced by using a composite paper machine having three or more papermaking sections. For example, in a three-layer lamination, a composite paper machine in which two layers of a surface layer and an intermediate layer are short-mesh papermaking such as a combination of a circle-short-short or a short-short-circle, or a circle-short-short. A composite paper machine in which only the middle layer is a short net paper, such as a combination of circles, is preferred. Using these composite paper machines, the paper is mixed in a basis weight of 20 to 35 g / m ² . If it is less than 20 g / m ² , there is no effect of preventing the exudation of the paste, and if it exceeds 35 g / m ² , it is difficult to obtain high air permeability. When it is 25 g / m ² or more, it exhibits excellent permeation prevention properties against bleeding of glue, and there is almost no difference due to the difference in basis weight between the front layer and the back layer. The basis weight of the surface layer including the front layer and the back layer is preferably 10 to 15 g / m ² . If it is less than 10 g / m ² , it is difficult to obtain a sufficient adhesive permeation prevention property, and if it exceeds 15 g / m ² , it is difficult to obtain high air permeability. The distribution of the basis weight of both layers is determined within the above range in consideration of the permeation prevention and the air permeability of the paste. For example, when the same stock is used for the surface layer, when the surface layer and the back layer have the same basis weight, that is, when the basis weight is 5 g / m ² , the air permeability becomes highest, and to obtain a still higher air permeability, It is necessary to select a fiber having a larger pore as a fiber constituting the layer. On the other hand, if the thickness of the back surface layer exceeds 10 g / m ² , the air permeability becomes low, which is not preferable.

The filter paper roll for cigarettes of the present invention is obtained by applying polyvinyl alcohol (PVA), polyvinyl alcohol (PVA) on the surface of the obtained laminated paper with various size presses or coaters.
Starch, various modified starches, carboxymethylcellulose (C
MC), a coating agent mainly composed of a water-soluble polymer such as sodium alginate may be applied. This is more effective in preventing the fibers from fluffing and falling off. Further, an alkyl ketene dimer (AKD) -based, maleic anhydride-based, or styrene-acrylic acid-based surface sizing agent can be blended with the coating agent.

The filter paper for cigarettes according to the present invention has a surface layer and a back layer mainly composed of cellulose fibers and small pores on both sides of an intermediate layer containing chemical fibers. Despite the air permeability, the bleeding of the glue is reduced and the falling off of the fibers is also reduced, so that it is possible to reduce the occurrence of troubles in the filter manufacturing process and the tobacco with filter manufacturing process. In addition, a filter plug having a flat surface and good slipperiness can be obtained.

[0027]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited to these examples. In the examples, preparation of samples and measurement of each characteristic value were performed by the following methods.

The basis weight, thickness, air permeability, seepage of the glue, and the number of dropped fibers were measured. The basis weight was measured using JISP8124, the thickness and density were measured using JIS P8118, and the air permeability was measured using a permeability meter (product name: PPM100) manufactured by Filtrona. The exudation of the paste was measured by the above-mentioned (hot-melt paste penetration preventing) test. The number of dropped fibers was measured by the following method.

(Number of dropped fibers) A stainless steel plate having a width of 46 mm and a thickness of 1 mm was placed on a sliding arm of a Sutherland type abrasion tester used in JIS K5701 "Testing method of planographic ink and letterpress ink", in accordance with the sliding direction. The stainless steel plate was mounted perpendicularly to the sliding surface so that the width direction of the stainless steel plate was perpendicular to the wear surface, and was used as a device for this test. Papermaking (MD) direction 1
After fixing a sample piece of 00 mm or more to the apparatus so that the MD direction and the sliding direction of the sample coincide with each other, a wear head on which a 500 g weight is placed is lowered on the sample piece, and the reciprocating force is 43 reciprocations / minute.
It was slid back and forth 0 times. The wear head was removed from the sample piece, and an adhesive tape (cleaning tape No. 2 manufactured by Furukawa Electric) having a width of 26 mm and a length of 56 mm was placed at the center of the wear area on the sample surface so that the adhesive surface was in contact with the sample surface. After reciprocating 1.5 times and pressing the pressure-sensitive adhesive tape on the sample, the pressure-sensitive adhesive tape was gently peeled off from the test piece, and the fibers having a length of 1 mm or more attached to the pressure-sensitive adhesive surface were counted with a 10-fold loupe to determine the number of dropped fibers. .

The filter paper for cigarette filter of the present invention was produced as follows.

Example 1 20% by mass of commercially available manila hemp pulp beaten to a freeness of CSF722 with a beater, 70% by mass of rayon fiber (manufactured by Daiwabo Rayon Co., Ltd., rayon SB (3d × 5 mm)), polyvinyl alcohol (PVA) binder Fiber (Kuraray Co., Ltd., VPB107, 1d × 3mm) 10
% By mass was mixed to prepare a papermaking raw material slurry for the intermediate layer.

Next, the freeness CSF420 is refined with a refiner.
Bleached commercial softwood bleached kraft pulp (NBKP)
And an alkyl ketene dimer (AKD) -based sizing agent (size pine K901, manufactured by Arakawa Chemical Industries, Ltd.) and a polyamide resin (RD805, manufactured by Japan PMC Co., Ltd.).
4 mass% (solid content / solid content), 0.1 mass% (solid content /
(Solid content) to prepare a papermaking raw material slurry for the front and back layers.

Using a TAPPI standard circular hand mill, a surface layer papermaking raw material slurry was collected at a basis weight of 5 g / m ² ,
A wet sheet is formed on a wire, coated and adhered on filter paper, and the back layer papermaking raw material slurry is weighed to 9.5.
g / m ^{2 was} collected, a wet sheet was formed on a wire, coated, and adhered to filter paper to prepare a front layer and a back layer. Next, the intermediate layer papermaking raw material slurry was
A sample equivalent to 5.5 g / m ^{2 was} collected, a wet sheet was formed on a wire in the same manner, the backside layer deposited on the previously prepared filter paper was overlaid and coated, and further deposited on the previously prepared filter paper. After laminating the surface layers, a wet press and drying were performed to produce a filter paper for cigarette of the present invention in which the surface layer and the back surface layer were laminated on both sides of the intermediate layer. The properties and the like of the obtained web are shown in Table 1.

Example 2 A cigarette filter wrapping paper of the present invention was produced in the same manner as in Example 1 except that the intermediate layer was 18 g / m ² and the back layer was 7 g / m ² . The properties and the like of the obtained web are shown in Table 1.

Example 3 A cigarette filter wrapping paper of the present invention was produced in the same manner as in Example 1 except that the intermediate layer was 20 g / m ² , the surface layer was 3 g / m ² , and the back layer was 7 g / m ^2. did. The properties and the like of the obtained web are shown in Table 1.

Example 4 In the same manner as in Example 1, a papermaking raw material slurry for the intermediate layer was prepared. Next, commercial softwood bleached kraft pulp (NBK
A papermaking raw material slurry for the front layer and the back layer was prepared in the same manner as in Example 1 except that the freeness of P) was changed to CSF409.

Except that the papermaking raw material slurry for the intermediate layer and the papermaking raw material slurry for the front and back layers were used, the intermediate layer was 11 g / m ² , and the front and back layers were 5 g / m ² . A cigarette filter wrapping paper of the present invention was produced in the same manner as in Example 1. The properties and the like of the obtained web are shown in Table 1.

Example 5 A cigarette filter wrapping paper of the present invention was produced in the same manner as in Example 4 except that the surface layer and the back surface layer were changed to 6.5 g / m ² . The properties and the like of the obtained web are shown in Table 1.

Example 6 A cigarette filter wrapping paper of the present invention was produced in the same manner as in Example 4 except that the surface layer was 5 g / m ² and the back layer was 10 g / m ² . The properties and the like of the obtained web are shown in Table 1.

Example 7 A cigarette filter wrapping paper of the present invention was produced in the same manner as in Example 4 except that the surface layer and the back surface layer were changed to 7.5 g / m ² . The properties and the like of the obtained web are shown in Table 1.

Comparative Example 1 Commercially available softwood bleached kraft pulp (NBKP) beaten to a freeness of CSF 690 64% by mass, rayon fiber (Rayon SB (3d × 5m) manufactured by Daiwabo Rayon Co., Ltd.)
m)) 300% by mass, polyvinyl alcohol (PVA)
-Based binder fiber (VPB107, 1 manufactured by Kuraray Co., Ltd.)
d × 3 mm) 6 mass%, and then an alkyl ketene dimer (AKD) sizing agent (Arakawa Chemical Industries, Ltd.)
Size Pine K901) and polyamide resin (Nippon PMC)
0.4% by mass (solid content /
Solid content) and 0.1% by mass (solid content / solid content) to prepare a papermaking raw material slurry.

Using a TAPPI standard circular hand pulverizer, a papermaking raw material slurry was collected at a basis weight of 24 g / m ² , a wet sheet was formed on a wire, coated, wet-pressed and dried to obtain a single-layer tobacco filter. A web was manufactured. Table 1 shows the properties and the like of this web.

Comparative Example 2 A single-layer cigarette filter wrapping paper was produced in the same manner as in Comparative Example 1 except that the commercial softwood bleached kraft pulp (NBKP) was beaten to CSF547. Table 1 shows the properties and the like of this web.

Example 8 20% by mass of commercially available manila hemp pulp beaten to a freeness CSF717 with a beater, 70% by mass of rayon fiber (manufactured by Daiwabo Rayon Co., Ltd., rayon SB (3d × 5 mm)), polyvinyl alcohol (PVA) binder Fiber (Kuraray Co., Ltd., VPB107, 1d × 3mm) 10
% By mass was mixed to prepare a papermaking raw material slurry for the intermediate layer.

Next, freeness CSF455 in a refiner
Bleached commercial softwood bleached kraft pulp (NBKP)
And an alkyl ketene dimer (AKD) -based sizing agent (size pine K901, manufactured by Arakawa Chemical Industries, Ltd.) and a polyamide resin (RD805, manufactured by Japan PMC Co., Ltd.).
4 mass% (solid content / solid content), 0.1 mass% (solid content /
(Solid content) to prepare a papermaking raw material slurry for the front and back layers.

The above-mentioned papermaking raw material slurry is sent to a composite paper machine having two short-mesh papermaking sections with one short-mesh papermaking section in the middle, and the surface layer is 5 g / m ² , the intermediate layer is 16 g / m ² , and the back side. The layer was adjusted to 9.5 g / m ^2, and the back layer, the intermediate layer, and the surface layer were laminated in this order to produce a filter paper for cigarette of the present invention. Table 2 shows the properties and the like of the obtained web.

Example 9 A papermaking raw material slurry for an intermediate layer was prepared in the same manner as in Example 8 except that the freeness of commercial manila hemp pulp was beaten to CSF680.

Commercially available bleached softwood kraft pulp (NBK
A papermaking raw material slurry for the front layer and the back layer was prepared in the same manner as in Example 8, except that the freeness of P) was beaten to CSF450.

[0049] Using the paper stock slurry, feeding the composite paper machine used in Example 8, the surface layer 5 g / ^{m 2,} an intermediate layer of 11g / ^{m 2,} so as to be 9.5 g / ^{m 2} to the back surface layer This was adjusted and the back layer, the intermediate layer, and the surface layer were laminated in this order to produce a tobacco filter wrapping paper of the present invention. Table 2 shows the properties and the like of the obtained web.

Example 10 A cigarette filter wrapping paper of the present invention was produced in the same manner as in Example 9 except that the surface layer was changed to 3 g / m ² . Table 2 shows the properties and the like of the obtained web. In addition, 3 g / m ²
Since it is difficult to obtain a single layer of the surface layer, the papermaking conditions for the intermediate layer and the backside layer are not changed, and only the feed rate of the papermaking raw material slurry for the surface layer is adjusted. 2g from the basis weight of combination papers when the layer 5g / ^{m 2} / ^m
After confirming the decrease by ^2, the basis weight of the surface layer was determined.

Example 11 A cigarette filter wrapping paper of the present invention was produced in the same manner as in Example 9 except that the surface layer was changed to 1 g / m ² . Table 2 shows the properties and the like of the obtained web. As in Example 10, since it is difficult to obtain a single layer of the surface layer of 1 g / m ² , the papermaking conditions of the intermediate layer and the backside layer were not changed, and only the feed rate of the papermaking raw material slurry of the surface layer was adjusted. The basis weight of the surface layer was confirmed from the decrease in basis weight of the laminated paper.

Comparative Example 3 A filter paper roll of 10,000 Coresta units used for a commercial tobacco "Mild Seven Super Light" was used for comparison. This rolled paper is a single-layer papermaking and has PV
An A-type coating agent was applied. Table 2 shows the properties and the like of the web.

[0053]

[Table 1]

[0054]

[Table 2]

As can be seen from the results shown in Tables 1 and 2, the bleeding of the glue of the webs of the present invention having a basis weight of 25 g / m ² and 30 g / m ² is very small, and the difference due to the constitution of each layer is different. Is rarely seen. As the thickness becomes smaller than 25 g / m ² , the bleeding of the glue suddenly increases.
The level is lower than that of a single-layer papermaking product. Therefore 2
If it is less than 0 g / m ^2, it is expected that the effect of preventing the exudation of the paste cannot be expected. If it exceeds 35 g / m ² , it is difficult to obtain high air permeability, which is not preferable.

The basis weight of the surface layer including the front layer and the back layer is 1
0 to 15 g / m ² is preferred. If it is less than 10 g / m ² , it is difficult to obtain a sufficient adhesive permeation prevention property, and if it exceeds 15 g / m ² , it is difficult to obtain high air permeability. When the same stock is used for the surface layer, the air permeability becomes highest when the basis weight of the front layer and the back layer is equal and thin, that is, when the basis weight is 5 g / m ² . Therefore,
In order to obtain a higher air permeability, it is necessary to select a fiber having a larger pore as a fiber constituting the surface layer.
If the thickness of the back surface layer exceeds 10 g / m ² , the air permeability decreases, which is not preferable. On the other hand, if it is less than 5 g / m ² , the bleeding of the paste increases, which is not preferable. The surface layer has a basis weight of 1
7.5 g / m ² is preferred. If it exceeds 7.5 g / m ² , the effect of preventing the fibers from fuzzing and falling off is unchanged, and the decrease in air permeability is increased.

The effect of coating with a water-soluble polymer or the like is evident in preventing the fibers from fluffing and falling off, and the surface layer is 3 g / m ^2.
The following shows excellent effects despite the thickness being so thin that the intermediate layer cannot be completely covered.

Using the rolled papers of Examples 1, 3, 5, and 9 of the present invention, samples were prepared by laminating a chip-perforated paper with vinyl acetate glue. This is like a real cigarette, but it is stuck together, avoiding the laser aperture.
When the surface layer of the take-up paper and the chip paper are attached (correct)
And the back layer of the web and the chip paper were bonded together (reverse) to prepare a sample. These samples were attached to a filtration meter manufactured by Filtrona Inc. so that pressurized air flowed in from the side of the chip paper, and measured under the conditions for measuring the ventilation, and the obtained value was defined as the air flow rate. Similarly, Comparative Example 3 was measured. Example 1 (9100 CU) 806 549 257 Example 3 (15600 CU) 914 677 237 Example 5 (13100 CU) 864 869 5 Example 9 (7810 CU) 876 839 37 Comparative example 3 (8520CU) 913 887 26 In Examples 1 and 3, the difference due to the surface to be attached to the chip paper is larger than in the other samples. The intermediate layer is thicker than the others, and it is thought that this is due to the difference in the configuration of the front layer and the back layer, which suggests that the air flowing from the opening has different characteristics. It seems to be.

[0059]

The cigarette filter wrapping paper of the present invention
On both sides of the intermediate layer containing the chemical fiber, the surface layer and the back layer, mainly composed of cellulose fiber and having a small pore diameter, are laminated by laminating, despite the air permeability of 4000 Coresta units or more. It became clear that the bleeding of the paste was small and the falling off of the fiber was also small. Advantageous Effects of Invention According to the present invention, there is provided a tobacco filter wrapping paper capable of reducing the occurrence of troubles in a filter manufacturing process and a filter tobacco manufacturing process and obtaining a filter plug having a flat surface and good slipperiness.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Keishi Hara 6-16-12 Ginza, Chuo-ku, Tokyo Mishima Paper Co., Ltd. F-term (reference) 4B045 AB11 4L055 AA02 AC06 AF09 AF10 AJ01 BD18 EA12 FA14 GA28

Claims (5)

[Claims] 1. A cigarette filter wrapping paper comprising at least three layers, wherein a surface layer and a back layer mainly composed of cellulose fibers are laminated on both sides of a layer containing a chemical fiber. A filter paper for tobacco having an air permeability of at least 4000 Coresta units. 2. The cigarette filter wrapping paper according to claim 1, wherein the front layer and the back layer have the same basis weight. 3. The cigarette filter wrapping paper according to claim 1, wherein the basis weight of the front layer is smaller than the basis weight of the back layer. 4. A filter paper for cigarettes according to claim 1, wherein the air permeability is at least 7000 Coresta units. 5. The filter paper for cigarettes according to claim 1, wherein the air permeability is not less than 9000 Coresta units.