JP2023146593A - kitchen paper roll - Google Patents

Abstract

To provide a kitchen paper roll which is excellent in thickness feel in a wet state.SOLUTION: A kitchen paper roll where kitchen paper is wound in a roll shape has a wound length of 25 to 35 m, and the kitchen paper is two-ply by integrally laminating a sheet having a projection part by embossment processing in a manner that projection part forming surfaces face in a nested manner. Basis weight per one ply is 18 to 25 g/m2, and a thickness of superposed five pairs is 1.5 to 3.0 mm. A reduction rate of a paper thickness in a wet condition is 0.1% to 4.0%.SELECTED DRAWING: Figure 1

Description

The present invention relates to a kitchen paper roll made of kitchen paper wound into a roll.

Some kitchen paper is used in the form of a kitchen paper roll wound up into a roll. This type of kitchen paper roll was generally 10 to 15 m long and about 50 cuts, but in recent years, due to changes in consumer lifestyles, daily necessities that are easy to store and stock are becoming more popular. As a result, many products with longer rolls of kitchen paper have been developed, with the roll length increased to 20 to 40 m (see Patent Documents 1 to 3 below).

With such long kitchen paper, if you simply lengthen the roll of kitchen paper without increasing the roll diameter, the winding pressure will increase in order to fit more paper into a certain diameter. There are problems such as the thickness of the kitchen paper itself becoming thinner and the space formed by embossing being crushed.

By the way, kitchen paper is mainly used for absorbing oil from fried foods, drippings from meat and fish, and wiping off moisture, oil, and dirt from ingredients, cooking utensils, and kitchen counters. It is used to absorb liquid.

JP 2017-115263 Publication JP2019-208854A Japanese Patent Application Publication No. 2020-110671

However, due to the global outbreak of the new coronavirus infection (COVID-19), people's awareness of hygiene has improved, and the demand for wiping paper used to wipe down objects and living things has increased. It is increasingly being used for general purposes, such as wiping off items after soaking them with a liquid such as liquid.

Conventional kitchen paper is mainly used in a dry state to absorb liquid as described above, so there are points that need to be improved in terms of the feeling of use in a pre-moistened state. Kitchen paper with paper specifications has problems such as the thickness of the kitchen paper itself becoming thinner and the spaces formed by embossing being crushed, so the feeling of use becomes worse when the fibers are loosened and the strength of the paper decreases. is more likely to decrease.

Therefore, the main problem of the present invention is to create a kitchen paper that has a long specification, but has excellent thickness especially in a wet state, and does not easily deteriorate in feel even when used for wiping. The purpose is to provide a roll.

The kitchen paper roll that solved the above problem is as follows.
A kitchen paper roll in which kitchen paper is wound into a roll,
The winding length is 25 to 35 m,
The kitchen paper is a two-ply sheet in which sheets having convex portions formed by embossing are laminated together in a nested manner with the convex portion forming surfaces facing each other,
The basis weight per ply is 18 to 25 g/m ² ,
The thickness of the 5 sets is 1.5 to 3.0 mm,
The paper thickness reduction rate when wet is 0.1% to 4.0%.

According to the present invention, there is provided a roll of kitchen paper in which the rolled kitchen paper has excellent thickness especially in a wet state, and does not easily deteriorate in usability even when used for wiping. be done.

It is a schematic diagram of a kitchen paper roll of an embodiment. It is a cross-sectional schematic diagram of the kitchen paper of embodiment.

Next, embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic diagram of the kitchen paper roll of this embodiment, and FIG. 2 is a schematic cross-sectional diagram of the kitchen paper.

The kitchen paper roll 100 of this embodiment is configured by winding the kitchen paper 1. Specifically, as shown in FIG. 1, the kitchen paper roll 100 consists of a strip of kitchen paper with dividing perforations 50, 50 arranged at predetermined intervals, which is rolled up in the circumferential direction of a paper tube 20. It is rotated and composed.

The paper tube 20 is not particularly limited, but a known paper tube used for the kitchen paper roll 100, for example, a cylindrical core can be used. The outer diameter L4 of the paper tube is, but not necessarily limited to, 37 to 41 mm.

In particular, the kitchen paper roll 100 of this embodiment has a roll length of 25 to 35 m, which is longer than conventional regular products (hereinafter also referred to as "short roll products") with a roll length of 10 to 15 m. This is a long kitchen paper roll (hereinafter also referred to as a "long product"). Therefore, compared to short products, they have advantages in terms of storage and stockability, and can be used for a longer period of time.

The roll diameter L1 of the kitchen paper roll of this embodiment is not necessarily limited, but if the roll diameter is excessively large compared to short rolls, the advantages of long rolls such as storage and stockability cannot be enjoyed. , it is said to be about the same level as a regular kitchen paper roll. Specifically, the winding diameter L1 is 110 to 125 mm.

The width L2 of the kitchen paper roll 100 of this embodiment is not necessarily limited, but may be 200 mm or more like a general roll width. Preferably it is 210 to 240 mm.

In the kitchen paper roll 100 of this embodiment, the number of sheets to be cut at the perforations 50, 50 is not necessarily limited, but is 125 to 175 cuts, preferably 145 to 155 cuts. As mentioned above, the winding diameter of long products is the same as that of short products, so in long products, the kitchen paper is wound with more tension. If the number of sheets to be cut by perforations is excessive when the winding length is 25 to 35 m, the number of perforations is excessive and the perforations are extended during winding, making it difficult to use because unintended cuts are likely to occur. . Moreover, it becomes difficult to manufacture. On the other hand, in kitchen paper rolls, the number of perforations affects the roll firmness of the roll. The cut tie ratio of the perforation and the length of the cut part in the kitchen paper roll of this embodiment are not limited. It can be designed as appropriate.

The kitchen paper 1 of this embodiment is so-called 2-ply paper that is composed of two sheets 11A and 11B. The sheets 11A and 11B are crepe paper, and fine wrinkles are formed on the surface by applying a blade called a doctor blade at the outlet of the dryer of the paper machine during the paper making process.

The fiber material of the sheets 11A and 11B is mainly pulp fiber, and the blending ratio of pulp is 90% by mass or more, preferably 95% by mass or more, and more preferably 100% by mass. It is particularly desirable that the pulp be 100% by mass virgin pulp that does not contain waste paper pulp. Specific pulp types include softwood pulps such as NBKP (softwood kraft pulp) and NUKP (softwood unbleached pulp), and hardwood pulps such as LBKP (hardwood kraft pulp) and LUKP (hardwood unbleached pulp). In particular, it is preferable that the softwood pulp, which is a virgin pulp, is made up of hardwood pulp, and that the pulp composition has a higher composition than the hardwood pulp. The ratio of softwood pulp to hardwood pulp is preferably from 50:50 to 90:10.

On the other hand, the basis weight of the sheets (1 ply) 11A and 11B is 16 to 25 g/m ² , preferably 19 to 24 g/m ² . Within these ranges, it is easy to wind the paper into a long product, ensure softness and feel during use, and easily reduce the paper thickness reduction rate when wet. Note that the basis weight is a value measured based on JIS P 8124.

Each sheet 11A, 11B of the kitchen paper 1 of this embodiment has a convex portion 12b formed on one side by embossing, and a concave portion 12a corresponding to the convex portion 12b on the other side. The sheets are laminated and integrated in a nested manner with the surfaces on which the convex portions 12b of each sheet are formed facing each other. As shown in FIG. 2, the nested format is a mode in which the convex portion 12b of one sheet is located in a portion of the other sheet where the convex portion 12b is not formed. The nested format allows the paper to be thinner, and it also makes it easier to develop strength in the thickness direction, making it easier to make kitchen paper that is especially long and thick.

In the kitchen paper 1 of the present embodiment, the sheets 11A and 11B may be laminated and integrated by bonding with the adhesive 13 via the top of the convex portion 12b. In this case, all the convex portions 12b may not be bonded. As the adhesive 13, a known adhesive used for kitchen paper having a laminated structure can be used. Examples of such adhesives include adhesives such as polyvinyl alcohol, starch, modified starch, and carboxymethyl cellulose. Preferably it is polyvinyl alcohol.

The paper thickness of the kitchen paper of this embodiment is not necessarily limited, but is 300 μm to 390 μm, preferably 310 μm to 380 μm. When the paper thickness is less than 300 μm, it becomes difficult to feel the thickness, and when it exceeds 390 μm, the paper thickness tends to decrease when wet. The paper thickness was measured by thoroughly conditioning the humidity of the test piece for each example under the conditions of JIS P 8111 (1998), and then using a dial thickness gauge (thickness measuring instrument) "PEACOCK G type" (Ozaki) under the same conditions. (manufactured by Seisakusho). The specific procedure is to make sure that there is no dirt, dust, etc. between the plunger and the measuring table, lower the plunger onto the measuring table, move the memory of the dial thickness gauge, and set the zero point. Next, raise the plunger and place the sample on the test stand, then slowly lower the plunger and read the gauge at that time. At this time, just place the plunger on it. The terminal of the plunger is made of metal, and the circular plane with a diameter of 10 mm is perpendicular to the plane of the paper, and the load when measuring the thickness is about 70 gf when the thickness is 120 μm. Note that the thickness is an average value obtained by measuring 10 times.

The kitchen paper roll of this embodiment is characterized in that the thickness of 5 sets of kitchen paper is 1.5 to 3.0 mm, more preferably 1.8 to 2.3 mm. Here, the thickness of 5 sets of kitchen paper is the thickness (mm) in the stacking direction when 5 sets of kitchen paper taken out from the kitchen paper roll are stacked, and can indicate the bulkiness of the kitchen paper. Note that a set of kitchen paper refers to a set of 2 plies. The thickness of 5 sets of kitchen paper can be used as an index for evaluating the bulkiness of kitchen paper. That is, in the kitchen paper roll, the kitchen paper is stretched and wound as described above. Therefore, the kitchen paper pulled out from the kitchen paper roll is released from the tension during rolling, and its thickness changes. In particular, long products tend to lose bulk because they are stretched and wound more tightly than short products. The kitchen paper roll of this embodiment has a thickness of 1.5 to 3.0 mm, which has high resilience and has a sufficient thickness. The thickness of the five sets is adjusted by controlling the tension when winding the kitchen paper of this embodiment onto a paper tube.

The kitchen paper roll of this embodiment is characterized in that the paper thickness decrease rate when the kitchen paper is wet is 0.1% to 4.0%. Preferably it is 1.5 to 2.5%. This kitchen paper is a kitchen paper pulled out from a kitchen paper roll. Kitchen paper usually loses its thickness when wet. The paper thickness reduction rate when wetted is the rate at which the paper thickness decreases when kitchen paper is moistened with water. The smaller the value, the better the ability to maintain the thickness when wet. In other words, the smaller the value, the easier it is to maintain the convex portions formed by embossing.

The rate of decrease in paper thickness when wet is measured as follows.
(1) Prepare two 10 cm x 10 cm x 2 mm thick acrylic plates (24.5 g each).
(2) Pull out kitchen paper from the kitchen paper roll and cut it into 5 cm x 5 cm pieces to use as test pieces.
(3) Place one test piece between the two acrylic plates prepared in (1) and measure the thickness (thickness A). When sandwiching the test piece between the acrylic plates, align the center of the kitchen paper with the center of the acrylic plate to align the center of gravity. (Thickness A) is measured using KEYENCE's "One Shot 3D Measurement Macroscope VR-3200" or its equivalent. The product name "VR-H2A" and its compatible software are used as software for observing, measuring, and analyzing images of laser microscope images. The measurement conditions are a magnification of 12 times and a visual field area of 18 mm x 24 mm. At this time, draw a straight line in the center of the 18 mm long x 24 mm wide screen in the MD and CD directions using the line roughness parameter, and subtract the thickness of the acrylic board (2.0 mm) from the height at the highest point. .
(4) Next, remove the acrylic plate and test piece from the measurement pedestal, remove the acrylic plate placed on top, and apply 200 μL of water evenly to the test piece using a pipette (Nichipet Ex2, Nichiryo Co., Ltd., etc.) .
(5) After applying water, quickly and quietly place the acrylic plate removed in (4) again on the test piece, and 60 seconds after applying water, repeat the same procedure as in (3) (thickness A). Measure the thickness of the test piece. This thickness is defined as (thickness B).
(6) From (thickness A) and (thickness B), the reduction rate of paper thickness when wet (wet paper thickness reduction rate) (%) = ((thickness A) - (thickness B)) / (thickness A) x Calculated as 100 (%).
(7) For each level, determine the wet paper thickness reduction rate for five test pieces and use the average value as the measured value.

Although the kitchen paper roll of this embodiment is a long product, the thickness of 5 sets of kitchen paper is 1.5 to 3.0 mm, which is comparable to short products, and furthermore, the rate of decrease in paper thickness when wet is 0. .1% to 4.0%, it has an excellent thickness feeling in a wet state, and the feeling of use does not deteriorate easily even when used for wiping. With such a characteristic kitchen paper roll, the compression and tension of the kitchen paper can be adjusted during winding.

Furthermore, "roll density", "dry tensile strength (longitudinal)", "dry tensile strength (longitudinal)", and "wet tensile strength (horizontal)" suitable for the kitchen paper roll of this embodiment will be described. These factors affect paper stiffness and tensile strength and are related to winder suitability, so these are the preferred "roll density," "dry tensile strength (longitudinal)," "dry tensile strength (longitudinal)," and "wet tensile strength (horizontal)." ), it becomes easier to adjust the paper thickness reduction rate especially when wet.

The kitchen paper roll of this embodiment preferably has a roll density of 0.12 to 0.15 g/cm ³ at the roll width of 200 mm or more. Roll density is expressed as (roll weight)/(roll capacity). The roll capacity is expressed as [{cross-sectional area of the outer diameter (winding diameter) portion of the roll}−(cross-sectional area of the core outer diameter (paper tube diameter) portion)] × roll width. The roll density represents the compressed state of the kitchen paper when it is wound up with a winder. If the roll density is high, it means that a large amount of paper is wound up in a certain narrow space and is compressed.

The kitchen paper roll of this embodiment has a dry tensile strength (vertical) of the kitchen paper of 1800 cN/25 mm or more, a dry tensile strength (horizontal) of 800 cN/25 mm or more, and a wet tensile strength (horizontal) of 240 cN/25 mm or more. desirable. The dry tensile strength (longitudinal) is preferably 1850 to 2400 cN/25 mm, the dry tensile strength (horizontal) is preferably 800 to 1000 cN/25 mm, and the wet tensile strength (horizontal) is preferably 240 to 400 cN/25 mm. If the strength of the drawn kitchen paper falls within the above range, it will be able to withstand the tension that occurs when a long product is wound up in a strongly pulled state, and it will be easy to achieve a suitable volume and wet paper thickness reduction rate. The dry tensile strength (longitudinal) and (horizontal) are values measured based on JIS P 8113 with a test piece having a width of 25 mm. Wet tensile strength (lateral) is a value measured based on JIS P 8135 with a test piece having a width of 25 mm.

In the kitchen paper roll according to this embodiment, the wrapping density of the kitchen paper is 0.20 to 0.40 m/cm ² , preferably 0.26 to 0.35 m/cm ² . Here, the winding density is a value obtained by dividing the winding length (m) of the kitchen paper by the radial area (cm ² ) of the kitchen paper roll. In the kitchen paper roll, by setting the winding density of the kitchen paper within such a range, the winding length of the kitchen paper can be increased without increasing the winding diameter.

Regarding the shape, density, area, etc. of the unevenness formed by embossing on the kitchen paper in the kitchen paper roll according to the present embodiment, the structure of the convex and recessed parts formed by embossing is not limited, but preferably has the following structure. If the structure of the unevenness due to embossing is as shown below, the paper will be more resilient to collapse in the thickness direction. The kitchen paper roll of the present invention is easy to use. That is, the density of the convex portions is 0.075 to 0.2 pieces/mm ² , preferably 0.076 to 0.15 pieces/mm ² , more preferably 0.077 to 0.1 pieces/mm ² It is. Here, the density of convex portions indicates the number of convex portions per unit area of the sheet. With this number of convex portions, appropriate dispersibility is achieved, and the kitchen paper becomes difficult to collapse in the thickness direction. Therefore, it is easy to reduce the rate of decrease in wet paper thickness.

The emboss area ratio is preferably 8 to 14%, more preferably 9 to 13%, even more preferably 9.5 to 12%. The embossed area ratio is the ratio of the area of the convex portions (concave portions) to the surface of the sheet. With this emboss area ratio, the liquid absorbing property due to embossing is likely to be exhibited.

The shape of the convex portion is not particularly limited, but may be, for example, circular, triangular, quadrangular, oval, etc. in plan view. Note that the shape of the top of the convex portion is preferably circular from the viewpoint of increasing the strength of the convex portion.

The dimensions of the protrusions are not particularly limited, but are preferably 1.0 to 1.6 mm/piece, more preferably 1.2 to 1.4 mm/piece, and still more preferably 1.3 to 1.38 mm/piece. The dimensions of the convex portion are the diameter of the circle when the shape of the convex portion is circular, the length of one side when the shape is a quadrangle or a triangle, and the major axis or minor axis when the convex portion is elliptical.

The unit area of the convex portions is not particularly limited, but is preferably 0.5 to 2.0 mm ² /piece, more preferably 1.0 to 1.7 mm ² /piece, and still more preferably 1.3 to 1.6 mm ² / pieces. Here, the unit area of the convex portion indicates the area of one convex portion.

Hereinafter, the kitchen paper roll according to the present invention will be further described with reference to Examples in which the effects of the present invention were verified.

Regarding the kitchen paper roll according to the present invention and commercially available products, the "water absorption amount", "paper thickness reduction rate due to moisture", and "oil absorption amount" were measured. A sensory test was conducted on ``water absorption'' and ``ease of wiping off oil stains''. All of the examples have concavities and convexities by embossing, and are laminated in a nested manner. Moreover, commercial product 1 is a long product, and commercial product 2 and commercial product 3 are from a product group in which the number of cuts is between the long product and the short product with 100 cuts.
In the sensory test of "Thickness when wiping with water,""Water absorbency when wiping with water," and "Ease of wiping off oil stains," 27 testers rated how it felt during actual use in five grades (Excellent). 5 points, 4 points for excellent, 3 points for fair, 2 points for slightly poor, and 1 point for poor), and the average score was rounded to one decimal place.
The method for measuring the "rate of paper thickness reduction due to wetting" is as described above. "Water absorption" and "oil absorption" were measured as follows. The physical properties, measured values, and evaluation for each example are shown in Table 1 below.

[Water absorption]
The water absorption was measured as described in (1) to (5) below.
(1) Measure the mass of the test piece using an electronic balance (A&D HR300, etc.).
(2) Fill a tray larger than the test piece (for example, inner dimensions: 215 mm x 160 mm) with water at 25° C. to a depth of about 20 mm.
(3) Spread the test piece and place it on a rigid flat screen (for example, 120 mm x 120 mm, mesh size 15 mm) that is larger than the test piece, and lower it into the water-filled tray to make contact with the water surface. Immerse the test specimen in water.
(4) When the water has sufficiently soaked into the surface of the test piece, raise the flat net just above the water surface, pinch the corners of the test piece with tweezers, and let it stand still for 30 seconds.
(5) After 30 seconds, the mass of the test piece that has absorbed water is measured using an electronic balance, and the amount of water absorbed per 1 m ² is calculated using the following formula.
Water absorption amount (g/m ² ) = ((mass of water-absorbed test piece measured in (4) above) - (mass of test piece measured in (1) above)) x 100 (Note: Convert to m ² Therefore, multiply by 100)

[Oil absorption amount]
The oil absorption was measured as described in (1) to (5) below.
(1) Measure the mass of the test piece using an electronic balance (A&D HR300, etc.).
(2) Into a tray larger than the test piece (for example, inner dimensions: 215 mm x 160 mm), put salad oil at 25°C (Nissin Salad Oil: manufactured by Nisshin Oilli Group Co., Ltd.) to a depth of about 20 mm.
(3) Spread the test piece on a rigid flat screen (e.g., 120 mm x 120 mm, 30 mm mesh) that is larger than the test piece, and place it in the tray containing the salad oil, and place it on the oil surface. Immerse the specimen in oil so that it makes contact.
(4) Once the surface of the test piece has been thoroughly soaked with salad oil, raise the flat screen just above the oil level, stand still for 30 seconds, then pinch the corner of the test piece with tweezers and place it in a pre-weighed measuring container. Transfer the test piece to At this time, do not exceed 30 seconds from when the flat screen is raised above the oil level and when it starts to stand still until it is transferred to the measurement container.
(5) The mass of the measurement container containing the test piece is measured using an electronic balance, and the mass of the measurement container is subtracted from the measured value to calculate the mass of the test piece after oil absorption. Then, the oil absorption amount per 1 m ² is calculated using the following formula.
Oil absorption (g/m ² ) = ((mass of oil-absorbed test piece measured in (4) above) - (mass of test piece measured in (1) above)) x 100 (Note: Convert to m ² Therefore, multiply by 100)

Comparing the examples of the present invention with commercially available products 2 and 3, each having a short winding length, there is no significant difference in water absorption and oil absorption. In addition, in terms of bulk, it is lower than Commercial Product 1, Commercial Product 2, and Commercial Product 3, but it is equal to or higher than Commercial Product 1, and each Example is lower than Commercial Product 2 and Commercial Product 3 in terms of paper thickness and bulk. It's comparable.
The characteristic feature is the rate of decrease in paper thickness when wet (under a pressure of 4.9 kPa). The reduction rate of Example is much lower than that of Commercial Products 1 to 3. Cellulose fibers swell when wet and the bond between fibers decreases, so under pressure the undulations and embossed shapes of the sheet flatten and the bulk (paper thickness) decreases. In the case of this paper thickness reduction rate when wet, the evaluation of "thickness when wiping with water" is particularly high, which is better than commercial products 2 and 3, which have higher paper thickness and bulk. It has been evaluated. Commercial products 2 and 3 are only slightly bulkier, but because the paper thickness decreases at a higher rate when wet, the unevenness due to embossing during wet conditions is more likely to collapse than in the example, and the evaluation results were as follows. is considered to have become lower. In this example, by adjusting the appropriate tension and paper quality using the winder, the rate of decrease in paper thickness when wet is small, and even though the paper is long, the rolled kitchen paper does not feel particularly thick when wet. This is an excellent kitchen paper roll that does not lose its usability even when used for wiping.

DESCRIPTION OF SYMBOLS 1... Kitchen paper, 100... Kitchen paper roll, 11A, 11B... Sheet (crepe paper), 12a... Recessed part by embossing, 12b... Convex part by embossing, 13... Adhesive, L1... Winding diameter, L2... Kitchen paper Roll width, L4...outer diameter of paper tube.

Claims (3)

A kitchen paper roll in which kitchen paper is wound into a roll,
The winding length is 25 to 35 m,
The kitchen paper is a two-ply sheet in which sheets having convex portions formed by embossing are laminated together in a nested manner with the convex portion forming surfaces facing each other,
The basis weight per ply is 18 to 25 g/m ² ,
The thickness of the 5 sets is 1.5 to 3.0 mm,
The paper thickness reduction rate when wet is 0.1% to 4.0%,
A kitchen paper roll characterized by: The roll width is 200 mm or more,
The roll density is 0.12 to 0.15 g/cm ³ ,
The kitchen paper roll according to claim 1. The kitchen paper roll according to claim 1 or 2, having a dry tensile strength (longitudinal) of 1800 cN/25 mm or more, a dry tensile strength (horizontal) of 800 cN/25 mm or more, and a wet tensile strength (horizontal) of 240 cN/25 mm.

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