WO2011114529A1 - Low basis weight tipping paper and cigarette with filter - Google Patents

Abstract

The disclosed tipping paper comprises pulp, and titanium oxide as a loading material. If x represents the basis weight (gsm) of the pulp, and y represents the basis weight (gsm) of the titanium oxide, x and y satisfy the formula: 31≤x+y<35, when 27≤x<31 and 4≤y<8.

Description

Low basis weight chip paper and filter cigarette

The present invention relates to a low basis weight chip paper that is spread as the outermost layer of a filter portion of a cigarette with a filter, and a cigarette with a filter provided with the chip paper.

The cigarette with filter is made by butting the cigarette rod and the filter, and the entire outer peripheral surface of the filter and the outer peripheral surface of the cigarette rod near the butted portion are wound with chip paper and integrated.

The chip paper ensures the tensile strength that is the required quality at the time of winding, the rigidity that is the required quality of the appearance of the rolled product, the concealment of powder rise, the opacity required by the design, and the proper combustion in the vicinity of the filter. In addition to having functional properties such as flame retardancy, a low basis weight is desired from the viewpoint of manufacturing and weight reduction during transportation.

Incidentally, Patent No. 2875184 discloses an invention of a flame-retardant base paper used for chip paper containing titanium oxide and kaolin as fillers. However, this invention relates to the improvement of fillers, and the base paper remains at a general basis weight (37 gsm) as described in the examples.

Japanese Patent Application Laid-Open No. 10-219599 discloses a chipping paper containing calcium carbonate having a specific particle size and reducing wear of a cutting instrument (such as a blade) during cutting. The claims of this publication describe that the basis weight of the chipping paper is 32 gsm. However, the invention of the above publication aims to replace titanium dioxide with a cheaper one, and uses calcium carbonate of a specific particle size as an alternative material, so at the expense of the flame retardancy required for chipping paper. ing.

Accordingly, none of the above-mentioned patent documents describes the low basis weight area while satisfying the functional properties of chip paper such as tensile strength, stiffness, opacity and flame retardancy in the design of chip paper, There is no suggestion.

On the other hand, it is also true that chip paper base paper having a basis weight of 31 to 35 gsm is also distributed in the market. However, although these low-basis weight chip paper bases ensure the tensile strength by the blending and beating degree of pulp, they are soft and lack of rigidity, so that they can be rolled up when applied to a cigarette with a filter, and the quality of the rolled product. Inferior. Moreover, the flame retardancy is also insufficient.

The present invention has been made in order to solve the above-described problems, and provides a chip paper that achieves a low basis weight while satisfying the functional properties of the chip paper such as tensile strength, stiffness, opacity, and flame retardancy, and the chip paper. A cigarette with a filter is provided.

According to a first aspect of the present invention, a chip paper comprising pulp and titanium oxide as a filler,
When the basis weight (gsm) of the pulp is x and the basis weight (gsm) of the titanium oxide is y, x and y are expressed by the following formula 31 ≦ x + y <35.
However, x and y are 27 ≦ x <31, 4 ≦ y <8.
A low basis weight chip paper is provided.

According to the second aspect of the present invention, a cigarette with a filter provided with the low basis weight chip paper is provided.

FIG. 1 is a graph showing the relationship between the amount of pulp of general-purpose base paper, tensile strength, and stiffness. FIG. 2 is a diagram showing the relationship between the basis weight and opacity when calcium carbonate or titanium oxide is added as a filler to a specific amount of pulp. FIG. 3 is a diagram showing an appropriate range of pulp amount and filler (titanium oxide) amount when realizing the low basis weight of the chip paper of the present invention. FIG. 4 is a perspective view showing a cigarette with a filter according to an embodiment of the present invention.

Hereinafter, a low basis weight chip paper and a cigarette with a filter according to an embodiment of the present invention will be described in detail.

The low basis weight chip paper which concerns on embodiment is a chip paper containing the titanium oxide as a pulp and a filler, Comprising: When the basic weight (gsm) of the said pulp is set to x, the basic weight (gsm) of the said titanium oxide is set to y. , X and y satisfy the following formula: 31 ≦ x + y <35, where x and y satisfy 27 ≦ x <31 and 4 ≦ y <8. That is, the chip paper according to the embodiment includes pulp and titanium oxide (filler), the basis weight is 31 gsm or more and less than 35 gsm, and the basis weight of the pulp and titanium oxide is 27 gsm or more and less than 31 gsm, or 4 gms or more and less than 8 gms, respectively.

Any pulp may be used as long as it is used for ordinary chip paper. For example, wood pulp classified into L material (hardwood) and N material (conifer), and non-wood such as bagasse, flax, hemp, etc. Examples include pulp, mechanical pulp obtained by simply crushing wood, and chemical pulp taken out by chemical treatment.

Titanium oxide preferably has an average particle size of 0.3 to 0.5 μm.

The present inventor has found the aforementioned low basis weight chip paper based on the following knowledge.

(1) Problems in lowering the basis weight Tensile strength, elongation, rigidity, unsatisfactory properties that are functional characteristics when the basis weight is simply reduced to 32 gsm without improving the composition etc. from general-purpose chip paper base paper having a basis weight of 37 gsm Transparency and whiteness were examined. The results are shown in Table 1 below. The tensile strength, elongation, stiffness, opacity and whiteness were measured by the measurement methods of the examples described later.

As is clear from Table 1, chip paper base paper simply reduced to 32 gsm has a large decrease in tensile strength. In addition, the stiffness and opacity are reduced. For this reason, simple weight reduction cannot be used as chip paper base paper. Therefore, advanced design considerations are necessary for low basis weight design to ensure tensile strength, stiffness, and opacity.

(2) Guarantee of tensile strength and stiffness The composition of general-purpose chip paper base paper was changed experimentally, and the relationship between tensile strength and stiffness was investigated. The result is shown in FIG. From FIG. 1, it was found that the minimum amount of pulp blended into the chip paper base paper is necessary to ensure sufficient strength properties. The amount of pulp was 25 gsm or more to ensure rigidity, and 27 gsm or more to ensure tensile strength. Therefore, it was found that a pulp amount of 27 gsm or more is necessary to satisfy the strength physical properties. In other words, it was found that the basis weight of 27 gsm is the lower limit in order to maintain proper strength physical properties as a chip paper base paper.

On the other hand, when the amount of pulp does not reach 27 gsm as in the case of general-purpose chip paper, there are a method of increasing the beating degree and increasing the fiber density, or a method of frequently using N material having high fiber strength. However, such a chip paper base paper clearly causes a decrease in stiffness as in tests 4 and 5 described later.

(3) Guarantee of opacity A certain amount of filler is required to ensure opacity. Calcium carbonate as a filler was added step by step with 27 gsm of pulp, which is a premise for ensuring the above-described strength properties, and the relationship between the basis weight and opacity was examined. The result is shown in FIG.

From the result of FIG. 2, in order to reach an appropriate value of 80% of opacity when using only calcium carbonate, which is generally a filler, 8 gsm of calcium carbonate is required. Therefore, the minimum basis weight is 35 gsm (calcium carbonate 23 wt%) in order to obtain a chip paper base with 80% opacity.

The inventor conducted a similar test by replacing the filler with the entire amount of titanium oxide in order to further examine the possibility of low basis weight design. The results are also shown in FIG. From FIG. 2, an appropriate value of 80% of opacity can be achieved with a titanium oxide (TiO ₂ ) amount of 4 gms, that is, an extremely small amount of titanium oxide (TiO ₂ ) compared to calcium carbonate, and a basis weight of 31 gsm (titanium oxide 13 wt%) is achieved. A chip paper having a lower limit could be obtained.

(4) Composition of chip paper according to embodiment In order to ensure strength properties from the above considerations (1) to (3), the lower limit amount of pulp is 27 gsm, and the content of titanium oxide as a filler is at least 4 gsm, Investigate to make it. From the results of this investigation, the relationship between the pulp amount (gsm) and the filler amount (gsm) shown in FIG. 3 is drawn, and the basis weight of the pulp (gsm) includes the basis weight of the shaded area shown in FIG. ) Is x, and the basis weight (gsm) of the titanium oxide is y, x and y are the following formulas: 31 ≦ x + y <35, where x and y are 27 ≦ x <31, 4 ≦ y <8 , A chip paper having a low basis weight (31 gsm or more and less than 35 gsm) was realized.

The low basis weight chip paper according to such an embodiment satisfies the appropriate values of physical properties and functions shown in Table 1 above. That is, the tensile strength, stiffness, opacity, flame retardancy and ink fixability are as follows: ・ Tensile strength: 26.0 N or more (required quality during winding),
・ Stiffness: Loop stiffness 2.0 or more (influence on the wrinkle defect of the rolled product),
・ Opacity: 80% or more (powder concealment, appearance quality required for design),
・ Flame retardance: (Guarantees proper combustion near the filter),
・ Ink fixability: Equivalent to general-purpose products
Indicates.

In the low-basis weight chip paper according to the embodiment, by fixing the sizing degree to 5 seconds or less, it becomes possible to improve the fixability of ink when printing a large area such as a cork ground.

That is, since calcium carbonate generally used as a filler is structurally porous, it has excellent fixability of printing ink and hardly causes printing problems such as ink dropping. On the other hand, the chip paper according to the embodiment in which the filler is changed from calcium carbonate to the total amount of titanium oxide has relatively poor ink fixability. For this reason, when printing of a large area at the time of manufacturing a cigarette, the ink is easily peeled off, which may cause product stains and machine stains.

Therefore, by setting the sizing degree to 5 seconds or less, which is lower than the normal sizing degree (about 20 seconds), the penetrability of the ink with respect to the chip paper was improved. As a result, it has become possible to improve the fixability of the ink without changing the ink formulation. In addition, a sizing agent can be calculated | required as a Hercule sizing tester value demonstrated below. In the chip paper of the embodiment, the sizing degree includes zero.

Hercule Sizing Tester Value This is a well-known method (TAPPI Provisional method T530-PM83) that was treated as an interim method in 1975 by the Association for Paper Pulp Technology: TAPPI. In the present invention, a measurement method using the present apparatus (Hercules Sizing Tester kc-294) was selected from a large number of sizing method, and the sizing degree was evaluated. Briefly, an evaluation paper piece cut from chip paper was sandwiched between folders made of wall surfaces of metal rings, set in an apparatus, and a dye mainly composed of naphthol green was poured therein. Activate the measurement switch immediately after pouring. After passing through the penetration time specific to the paper piece, the time until the back side of the paper piece became green of the dyeing liquid and a certain reflectance was recorded as sizing (seconds). In this measurement, the reflectance was set to 80%.

The reduction in sizing degree can be achieved by keeping the amount of sizing agent added to the chip paper low. Examples of sizing agents include emulsion rosin size, rosin soap size, alkenyl succinic acid soap, fatty acid sizing agent, alkyl ketene dimer, alkenyl succinic anhydride, rosin ester type size, alkenyl ketene dimer, styrenic polymer size. These sizing agents can be used alone or in the form of a mixture. Of the sizing agents, alkyl ketene dimers are preferred.

Chip paper having a low basis weight (for example, a basis weight of 32 gsm) according to the embodiment described above has the following effects.

• The thickness of the chip paper can be reduced by 14% (reduced from 43 μm thickness to 37 μm thickness) compared to general-purpose chip paper (basis weight 37 gsm). For this reason, when the outer diameter of the bobbin wound with the chip paper is equal to that of the general-purpose chip paper, the length can be increased by about 15% (increase from 3000 mm to 3500 mm). As a result, the number of cigarettes produced per bobbin can be increased by about 15% at the time of cigarette manufacture, and productivity can be improved.

· Since the weight of chip paper can be reduced by 14% compared to general-purpose chip paper (basis weight 37gsm), energy related to transportation is reduced, which is beneficial in terms of environment and transportation costs.

・ By changing from general-purpose chip paper, flame retardancy can be imparted while enjoying the benefits without significant cost increase.

If the flame-retardant base paper having a basis weight of 37 gsm is changed, it is possible to reduce the base paper cost while enjoying the benefits.

Next, the cigarette with a filter according to the embodiment will be described.

The cigarette with a filter according to the embodiment includes the above-described low basis weight chip paper.

Specific cigarette with filter will be described in detail with reference to FIG. A cigarette with a filter has a structure in which the cigarette rod 1 and the filter 2 are integrated by butting the cigarette rod 1 and the filter 2 by winding the entire outer peripheral surface of the filter 2 and the outer peripheral surface of the cigarette rod 1 in the vicinity of the butting with the tip paper 3. Have. The cigarette rod 1 is formed by winding the tobacco cut 4 in a cylindrical shape with the wrapping paper 5. The filter 2 is formed of, for example, a filter material (not shown) formed by bundling or folding non-woven fabrics of acetate fiber or pulp, and plug paper (molded paper) 6 in which the filter material is rolled in a columnar shape. Has been. The chip paper 3 contains pulp and titanium oxide as a filler. When the basis weight (gsm) of the pulp is x and the basis weight (gsm) of the titanium oxide is y, x and y are expressed by the following formula: 31 ≦ x + y <35, However, x and y satisfy 27 ≦ x <31 and 4 ≦ y <8.

The cigarette with a filter according to such an embodiment is reduced in weight and cost while maintaining its functional characteristics (tensile strength, rigidity, opacity and flame retardancy) from the effect of the low basis weight chip paper described above. Can be planned.

Hereinafter, embodiments of the present invention will be described in detail. In the following Examples, the pulp material used was wood pulp in which L material and N material were mixed at an appropriate ratio, and calcium carbonate having an average particle size of 5 μm and titanium oxide having an average particle size of 0.4 μm was used. .

Example 1
Four types of chip paper having the compositions shown in Table 2 below were prepared. In addition, these chip papers (Comparative 1, Tests 1 to 3) were adjusted in size to 21 seconds, 23 seconds, 23 seconds, and 23 seconds, respectively, by adding an alkyl ketane dimer as a sizing agent. Each chip paper was measured for tensile strength, elongation, stiffness, opacity, whiteness and thickness by the following methods. The results are shown in Table 2 below.

1) Tensile strength A constant speed extension type tensile tester (Tensilon type tensile tester) was used. Both ends in the longitudinal direction of a 15 mm wide paper piece cut from the chip paper were fixed to a movable knob of the measuring instrument. The movable part was moved, and the maximum load immediately before the piece of paper was cut at a constant speed was electrically detected and recorded in units of Newton (according to JIS P8113).

2) Elongation A constant speed elongation type tensile tester (Tensilon type tensile tester) was used. Both ends in the longitudinal direction of a 15 mm wide paper piece cut from the chip paper were fixed to a movable knob of the measuring instrument. The movable part was moved, and the maximum elongation immediately before the piece of paper was cut at a constant speed was detected electrically and recorded in% (based on JIS P8113).

3) Stiffness A loop stiffness tester (manufactured by Toyo Seiki Seisakusho Co., Ltd.) was used. Both ends in the longitudinal direction of a 15 mm wide paper piece cut from the chip paper were fixed to the movable part of the measuring instrument. Then, the space | interval of both ends was narrowed in the movable part and the paper piece loop formed with the paper piece of 62 mm length was produced. The maximum stress when the paper loop was applied to the sensor was read as a signal and recorded in g. The movable amount of the sensor applied to the paper piece loop was set to 2 mm after being applied to the paper piece.

4) Opacity Using a photovolt type measuring instrument, each piece of paper cut from chip paper was measured and recorded in% units.

5) Whiteness Using a photovolt type measuring instrument, a predetermined number of paper pieces cut from chip paper were measured so as not to transmit light and recorded in% units.

6) Thickness A piece of paper cut from chip paper was measured with a digital micrometer and recorded in units of μm for each sheet (conforms to JIS P8118).

As is clear from Table 2, the low basis weight (32 to 34 gsm) chip papers of Tests 1 to 3 of the present invention are amber to the general purpose chip paper of Comparative Example 1 having a basis weight of 37 gsm and a filler of calcium carbonate. It can be seen that it has no functional characteristics and high quality.

(Example 2)
Two types of chip paper shown in Table 3 below were prepared. The pulp in these chip papers was used in an amount that was less than the lower limit of the pulp (27 gsm) of the present invention, and the beating degree was extremely increased. These chip papers were measured for tensile strength, elongation, stiffness, opacity, whiteness and thickness in the same manner as in Example 1. The results are shown in Table 3 below.

As apparent from Table 3, the chip papers of Tests 4 and 5 have a low basis weight (31 gsm, 33 gsm), but the amount of pulp is less than the lower limit amount of pulp (27 gsm) of the present invention (23.0 gsm, 24.0 gsm), the tensile strength is ensured by the high beating degree described above, but it can be seen that the decrease in stiffness is significant.

(Example 3)
Addition of alkyl ketene dimer as a sizing agent in the same composition as the chip paper of Comparative 1 in Table 2 (size: 21 seconds), the chip paper of Test 1 (size: 23 seconds), and Test 1 of Table 2 A chip paper of test 6 having a sizing degree of 5 seconds with an adjusted amount was prepared. These chip papers were tested for ink fixability by the following method. The results are shown in Table 4 below.

7) Ink fixability Ink fixability requires evaluation of both abrasion resistance against rubbing and stability against peeling.

For wear resistance, a Gakushin type friction fastness tester was used. The friction element has a semi-cylindrical friction body (dimensions: bottom portion length 20 mm × width 20 mm, curvature radius 45 mm, weight 150 g) and a 200 g cylindrical weight (diameter) attached to the upper curved surface of the friction body. 45 mm × height 24 mm). A white test paper for observing ink spillage having the same size as the bottom surface portion was attached to the bottom surface portion of the friction body of the friction element. Moreover, the test piece (printed test piece) which printed on the rectangular flat surface of the semi-cylindrical stainless steel board of curvature radius 200mm was fixed. In the abrasion resistance test, the friction piece was set on the printed test piece of the stainless steel board so that the white test paper was in contact with the test piece, and the friction piece was rubbed 50 times on the printed test piece. The color fading was evaluated by observing the test paper.

Stability was determined by observing the degree of color fading when a commercially available adhesive tape was applied to the printed test piece with a weight of 100 g and immediately peeled off.

The ink fixability by such a test is “bad” when significant ink transfer is observed on white test paper or adhesive tape, and “good” when slight ink transfer is observed. When the paper was peeled off from the adhesive tape and peeled for each paper layer, it was judged as “very good”.

As apparent from Table 4, the low basis weight (32 gsm) chip paper of Test 1 of the present invention has good ink fixing property even when the sizing degree is 23 seconds, and the sizing degree is 5 seconds. It can be seen that the low basis weight (32 gsm) chip paper of Test 6 is equivalent to the chip paper of Comparative 1 (basis weight: 37 gsm), which is a general-purpose product having a sizing degree of 21 seconds, and shows better ink fixing properties.

Example 4
The chip papers of Comparative 1 and Tests 1 and 3 in Table 2 were applied to brand A and brand B, which are cigarettes with a filter. These brands A and B were examined for flame retardancy by the following method. The results are shown in Table 5 below.

8) Flame retardancy A cigarette was mounted horizontally on an automatic smoking machine (RM20 / CS, BORGWARD), ignited by one smoking, and then spontaneously combusted until it disappeared. By observing the cigarette after the burning, the burning progressed to the chip paper, and the number of fires that fell and the one that did not fall but the burning progressed to the chip paper were counted, and the respective ratios were obtained. In addition, the tip of the chip paper on the cigarette rod side was slightly burned, and those whose combustion was clearly stopped were excluded from the count as having flame retardancy.

As apparent from Table 5, the cigarette with filter (brands A and B) using the chip papers of Test 1 and Test 3 is superior to the cigarette with filter (brands A and B) using the chip paper of Comparative 1 It can be seen that it exhibits flame retardancy.

The present invention provides chip paper that has improved the productivity of cigarettes with a filter, reduced weight, improved transportation costs, reduced raw paper costs, and functional characteristics required for chip paper ( A cigarette with a filter that achieves low weight and low cost while maintaining tensile strength, rigidity, opacity and flame retardancy can be provided.

Claims (4)

1. Chip paper containing pulp and titanium oxide as filler,
   When the basis weight (gsm) of the pulp is x and the basis weight (gsm) of the titanium oxide is y, x and y are expressed by the following formula 31 ≦ x + y <35.
   However, x and y are 27 ≦ x <31, 4 ≦ y <8.
   Meet chip paper.
2. The chip paper according to claim 1, further comprising an alkyl ketene dimer as a sizing agent.
3. The chip paper according to claim 2, wherein the sizing degree is 5 seconds or less.
4. A cigarette with a filter comprising the chip paper according to claim 1.

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