Kitchen paper roll

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

[Technical field]

[0001] The present invention relates to a kitchen paper roll in which kitchen paper is wound into a roll. [Background technology]

[0002] Some kitchen paper is used in the form of a kitchen paper roll wound into a roll. This type of kitchen paper roll was generally 10 to 15 m long and had about 50 cuts, but in recent years, due to changes in consumer lifestyles, there has been a trend toward preferring daily necessities with high storage and stock properties, and many long kitchen paper products with roll lengths of 20 to 40 m have been developed (see Patent Documents 1 to 3 below).

[0003] With such long kitchen paper, simply increasing the length of the paper roll without increasing the roll diameter requires higher winding pressure to fit a large amount of paper into a certain diameter, which can result in problems such as the thickness of the kitchen paper itself becoming thinner and the spaces formed by the embossing process becoming crushed.

[0004] Meanwhile, kitchen paper is primarily used to absorb oil from fried foods, drips from meat and fish, and to wipe off moisture, oil, and dirt from food ingredients, cooking utensils, and kitchen counters, and is primarily used to absorb liquids in a dry state. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2017-115263 A [Patent Document 2] JP 2019-208854 A [Patent Document 3] JP 2020-110671 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, due to the global spread of the new coronavirus disease (COVID-19), people's awareness of hygiene has increased, and the demand for wipes to be used for wiping objects and living things has increased. As a result, kitchen paper is now often used for general purposes, such as soaking it in liquids such as water or alcohol and then wiping objects.

[0007] Conventional kitchen paper is primarily used to absorb liquids in a dry state, as described above, and therefore there is room for improvement in terms of the feel when the paper is wetted in advance. In particular, long-length kitchen paper has problems such as the thickness of the paper itself becoming thin and the spaces formed by the embossing process becoming crushed, and as a result, the feel when the paper is wetted is more likely to deteriorate as the fibers become loose and the paper strength decreases.

[0008] Therefore, the main object of the present invention is to provide a kitchen paper roll which, despite being long, has excellent thickness, particularly in a wet state, around which the feel of use is not easily impaired even when used for wiping purposes. [Means for solving the problem]

[0009] The kitchen paper roll that solves the above problems is as follows. A kitchen paper roll in which kitchen paper is wound into a roll, The roll length is 25 to 35 m. The kitchen paper is a two-ply sheet having embossed projections, the two plies being integrated in a nested manner with the projection-forming surfaces facing each other; Basis weight per ply: 18~25g / m 2 and The thickness of the five layers is 1.5 to 3.0 mm. The reduction in paper thickness when wet is 0.1% to 4.0%. Effect of the Invention

[0010] According to the present invention, there is provided a kitchen paper roll in which the wrapped kitchen paper has an excellent thickness, particularly in a wet state, despite being long, and the usability is not likely to deteriorate even when used for wiping purposes. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic diagram of a kitchen paper roll according to an embodiment. [Diagram 2] 1 is a schematic cross-sectional view of a kitchen paper according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Next, an embodiment of the present invention will be described in detail below with reference to the drawings. Figure 1 is a schematic diagram of a kitchen paper roll of this embodiment, and Figure 2 is a schematic cross-sectional view of the kitchen paper.

[0013] The kitchen paper roll 100 of this embodiment is formed by winding up kitchen paper 1. Specifically, as shown in Fig. 1, the kitchen paper roll 100 is formed by winding up a strip of kitchen paper, on which separating perforations 50, 50 are arranged at predetermined intervals, in the circumferential direction of a paper tube 20.

[0014] The cardboard tube 20 is not particularly limited, but may be a known cardboard tube, such as a cylindrical core, used for the kitchen paper roll 100. The outer diameter L4 of the cardboard tube is, but is not necessarily limited to, 37 to 41 mm.

[0015] The kitchen paper roll 100 of this embodiment is a long-length kitchen paper roll (hereinafter also referred to as a "long product"), with a wound length of 25 to 35 m, which is longer than conventional normal products (hereinafter also referred to as "short products") with wound lengths of 10 to 15 m. Therefore, compared to short products, it has advantages in terms of storability and stock, and can be used for a longer period of time.

[0016] The roll diameter L1 of the kitchen paper roll of this embodiment is not necessarily limited, but if the roll diameter is excessively larger than that of a short product, the advantages of long products such as ease of storage and stock will not be obtained, so the roll diameter L1 is set to be approximately the same as that of a normal kitchen paper roll. Specifically, the roll diameter L1 is 110 to 125 mm.

[0017] The width L2 of the kitchen paper roll 100 of this embodiment is not necessarily limited, but it may be 200 mm or more, similar to the width of a typical roll, and is preferably 210 to 240 mm.

[0018] The number of sheets cut by the perforations 50, 50 in the kitchen paper roll 100 of this embodiment is not necessarily limited, but is 125 to 175 cuts, preferably 145 to 155 cuts. As described above, the roll diameter of the long product is the same as that of the short product, so the kitchen paper is wound in a more stretched state in the long product. If the number of sheets cut by the perforations is excessively large when the roll length is 25 to 35 m, the number of perforations is excessive, and the perforations are stretched during winding, making it difficult to use as unintended cuts are likely to occur during use. In addition, it is difficult to manufacture. On the other hand, the number of perforations affects the tightness of the kitchen paper roll. The cut-tie ratio of the perforations and the length of the cut part in the kitchen paper roll of this embodiment are not limited. They can be designed appropriately.

[0019] The kitchen paper 1 of this embodiment is what is called a two-ply paper, consisting 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 to the paper at the outlet of the dryer of the papermaking machine during the papermaking process.

[0020] The sheets 11A and 11B mainly contain pulp fibers as their fiber material, and the blending ratio of pulp is 90% by mass or more, preferably 95% by mass or more, and more preferably 100% by mass. The pulp is desirably 100% by mass of virgin pulp that does not contain recycled paper pulp. Specific pulp types include softwood pulp such as NBKP (softwood kraft pulp) and NUKP (softwood unbleached pulp), and hardwood pulp such as LBKP (hardwood kraft pulp) and LUKP (hardwood unbleached pulp). In particular, it is preferable that the softwood pulp, which is virgin pulp, is composed of hardwood pulp, and that the pulp composition has a higher content of softwood pulp than hardwood pulp. The ratio of softwood pulp to hardwood pulp is preferably 50:50 to 90:10.

[0021] 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, the paper can be easily wound into a long product, the softness and feel during use can be ensured, and the rate of paper thickness loss when wet can be reduced. The basis weight is a value measured based on JIS P 8124.

[0022] 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 formed on the other side. The sheets are laminated and integrated in a nested format with the surfaces of the sheets on which the convex portions 12b 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 on which the convex portion 12b is not formed. The nested format allows the paper thickness to be thin, and also makes it easy to develop strength in the thickness direction, making it easy to produce kitchen paper that is particularly long and thick.

[0023] In the kitchen paper 1 of this embodiment, the sheets 11A and 11B may be laminated and integrated by bonding the tops of the protrusions 12b with an adhesive 13. In this case, not all of the protrusions 12b need to be bonded. The adhesive 13 may be a known adhesive used in kitchen paper having a laminated structure. Examples of such adhesives include adhesives such as polyvinyl alcohol, starch, modified starch, and carboxymethyl cellulose. Polyvinyl alcohol is preferable.

[0024] The 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. If the thickness is less than 300 μm, the feeling of thickness is difficult to feel, and if it exceeds 390 μm, the thickness is likely to decrease when wet. The method of measuring the paper thickness is to thoroughly condition the test piece according to each example under the conditions of JIS P 8111 (1998), and then measure the thickness under the same conditions using a dial thickness gauge (thickness measuring device) "PEACOCK G type" (manufactured by Ozaki Manufacturing Co., Ltd.). The specific procedure is to make sure that there is no dirt or dust between the plunger and the measuring table, lower the plunger onto the measuring table, move the scale of the dial thickness gauge to set the zero point, and then raise the plunger. Test specimen Place it on the test bench, slowly lower the plunger, and read the gauge. At this time, just place the plunger on the test bench. The plunger terminal is made of metal, and the circular flat surface with a diameter of 10 mm is placed perpendicular to the paper plane. The load when measuring this thickness is about 70 gf at 120 μm. The thickness is the average value obtained by performing the measurement 10 times.

[0025] The kitchen paper roll of this embodiment is characterized in that the thickness of the five sets of kitchen paper is 1.5 to 3.0 mm, and more preferably 1.8 to 2.3 mm. Here, the thickness of the five sets of kitchen paper is the thickness (mm) in the stacking direction when five sets of kitchen paper taken out from the kitchen paper roll are stacked, and can indicate the bulkiness of the kitchen paper. Note that one set of kitchen paper is one set of two plies. The thickness of the five sets of kitchen paper can be an index for evaluating the bulkiness of the kitchen paper. That is, in the kitchen paper roll, as described above, the kitchen paper is pulled and wound. Therefore, the kitchen paper pulled out from the kitchen paper roll is released from the tension at the time of rolling and the thickness changes. In particular, in the case of a long product, the bulk is easily reduced because it is pulled and wound tighter than a short product. In the kitchen paper roll of this embodiment, the thickness of the five sets is 1.5 to 3.0 mm, which has high restorability and a sufficient sense of thickness. The thickness of the five-ply stack is adjusted by controlling the tension when the kitchen paper of this embodiment is wound around the paper tube.

[0026] The kitchen paper roll of this embodiment is characterized in that the reduction in paper thickness when wet is 0.1% to 4.0%. Preferably, it is 1.5 to 2.5%. This kitchen paper is kitchen paper pulled out from a kitchen paper roll. Kitchen paper usually reduces in thickness when wet. The reduction in paper thickness when wet is the ratio of the reduction in paper thickness when kitchen paper is moistened with water. A smaller value indicates the ability to retain thickness when wet. In other words, the smaller the value, the easier it is to maintain the protrusions created by embossing.

[0027] The percent reduction in paper thickness when wet is measured as follows. (1) Prepare two acrylic sheets measuring 10 cm x 10 cm x 2 mm thick (24.5 g each). (2) Pull out some kitchen paper from the roll and cut it into a 5 cm x 5 cm test piece. (3) One test piece is sandwiched between the two acrylic plates prepared in (1) and the thickness (A) is measured. When sandwiching the test piece between the acrylic plates, the center of the kitchen paper is aligned with the center of the acrylic plate to align the center of gravity. The thickness (A) is measured using a KEYENCE One-Shot 3D Measuring Macroscope VR-3200 or an equivalent device. The software for observing, measuring, and analyzing images of the laser microscope is the product name VR-H2A or its compatible software. The measurement conditions are a magnification of 12 times and a field of view area of ​​18 mm x 24 mm. At this time, a straight line is drawn in the MD and CD directions using the line roughness parameters in the center of the screen, which is 18 mm long and 24 mm wide, and the thickness of the acrylic plate (2.0 mm) is subtracted from the height at the highest point. (4) Next, remove the acrylic plate and the test piece from the measurement base, temporarily remove the acrylic plate placed on top, and evenly apply 200 μL of water to the test piece using a pipette (Nichipet Ex2, Nichiryo Co., Ltd., etc.). (5) After the water has been applied, quickly and gently place the acrylic plate removed in (4) back onto the test piece, and 60 seconds after the water has been applied, measure the thickness of the test piece using the same procedure as in (3) (Thickness A). This thickness is called (Thickness B). (6) From (Thickness A) and (Thickness B), calculate the reduction rate of paper thickness when wet (Wet paper thickness reduction rate) (%) = ((Thickness A) - (Thickness B)) / (Thickness A) x 100 (%). (7) For each level, the wet paper thickness reduction rate is determined for five test pieces and the average value is used as the measured value.

[0028] The kitchen paper roll of this embodiment is a long product, but the thickness of five kitchen paper sheets is 1.5 to 3.0 mm, which is comparable to a short product, and furthermore, the paper thickness reduction rate when wet is 0.1% to 4.0%, which is excellent in thickness when wet, and the feeling of use is not likely to deteriorate even when used for wiping. In order to obtain such a characteristic kitchen paper roll, the compression and tension of the kitchen paper can be adjusted when winding it with a winder.

[0029] Furthermore, the “roll density”, “dry tensile strength (vertical)”, and “dry tensile strength ( beside ) and "Wet tensile strength (horizontal)". These affect the stiffness and tensile strength of the paper and relate to winder suitability, so the preferred "roll density", "dry tensile strength (vertical)", and "dry tensile strength ( beside )" and "Wet tensile strength (transverse)", it becomes easier to adjust the rate of paper thickness reduction when wet.

[0030] The kitchen paper roll of this embodiment has a roll density of 0.12 to 0.15 g / cm3 in the roll width of 200 mm or more. 3 It is desirable that the roll density is (roll weight) ÷ (roll capacity). Roll capacity is expressed as [{cross-sectional area of ​​the roll's outer diameter (winding diameter) part} - (cross-sectional area of ​​the core's outer diameter (paper tube diameter) part)] x roll width. Roll density indicates the compression state of the kitchen paper when it is wound on the winder, and a high roll density indicates that a large amount of paper is wound in a certain small space, resulting in a compressed state.

[0031] In the kitchen paper roll of this embodiment, the dry tensile strength (vertical) of the kitchen paper is preferably 1800cN / 25mm or more, the dry tensile strength (horizontal) is preferably 800cN / 25mm or more, and the wet tensile strength (horizontal) is preferably 240cN / 25mm or more. The dry tensile strength (vertical) is preferably 1850 to 2400cN / 25mm, the dry tensile strength (horizontal) is preferably 800 to 1000cN / 25mm, and the wet tensile strength (horizontal) is preferably 240 to 400cN / 25mm. If the strength of the unwound kitchen paper is within the above range, it can withstand the tension when a long product is wound up in a strongly pulled state, and it is easy to achieve a suitable bulk and wet paper thickness reduction rate. The dry tensile strengths (vertical) and (horizontal) are values ​​measured based on JIS P 8113 with a test piece of 25mm width. The wet tensile strength (transverse) was measured based on JIS P 8135 using a test piece having a width of 25 mm.

[0032] The kitchen paper roll according to this embodiment has a winding density of the kitchen paper of 0.20 to 0.40 m / cm 2 and preferably 0.26 to 0.35 m / cm 2 Here, the winding density is calculated by dividing the length of the paper roll (m) by the radial area of ​​the paper roll (cm 2 By setting the winding density of the kitchen paper in this range for a kitchen paper roll, the winding length of the kitchen paper can be increased without increasing the winding diameter.

[0033] The shape, density, area, etc. of the unevenness caused by the embossing process on the kitchen paper in the kitchen paper roll according to this embodiment of The configuration of the convex and concave portions by embossing is not limited, but the following configuration is preferable. When the convex and concave portions by embossing are configured as described below, the crush recovery in the thickness direction of the paper is improved, and it is easy to produce the kitchen paper roll of the present invention. That is, the density of the convex portions is 0.075 to 0.2 pieces / mm 2 and preferably 0.076 to 0.15 pieces / mm 2 , more preferably 0.077 to 0.1 pieces / mm 2 Here, the density of the protrusions refers to the number of protrusions per unit area of ​​the sheet. This number of protrusions provides appropriate dispersion and makes the kitchen paper less likely to be crushed in the thickness direction. Therefore, it is easy to reduce the reduction rate of the wet paper thickness.

[0034] The embossed area ratio is preferably 8 to 14%, more preferably 9 to 13%, and further preferably 9.5 to 12%. The embossed area ratio is the ratio of the area of ​​convex parts (concave parts) to the surface of the sheet. With this embossed area ratio, the liquid absorbency due to the embossing process is easily exhibited.

[0035] The shape of the protrusions is not particularly limited, and may be, for example, a circle, a triangle, a rectangle, an ellipse, etc. in a plan view. From the viewpoint of increasing the strength of the protrusions, it is preferable to adopt a circle as the shape of the top of the protrusions.

[0036] The size of the protrusions is not particularly limited, but is preferably 1.0 to 1.6 mm / piece, more preferably 1.2 to 1.4 mm / piece, and further preferably 1.3 to 1.38 mm / piece. / The size of the protrusion refers to the diameter of a circle when the shape of the protrusion is circular, refers to the length of one side when the shape is rectangular or triangular, and refers to the major axis or minor axis when the shape is elliptical.

[0037] The unit area of ​​the protrusion 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, more preferably 1.3 to 1.6 mm 2 Here, the unit area of ​​the protrusions indicates the area per one protrusion.

[0038] The kitchen paper roll according to the present invention will be further described below with reference to examples in which the effects of the present invention are verified. EXAMPLES

[0039] The kitchen paper roll according to the present invention and a commercially available product were measured for "water absorption amount," "paper thickness reduction rate due to wetting," and "oil absorption amount," and further subjected to sensory tests for "thickness when wiping with water," "water absorption when wiping with water," and "ease of wiping off oily stains." All of the examples have unevenness due to embossing, and are layered in a nested format. Commercial product 1 is a long product, while commercial products 2 and 3 are products in the product group between the long product and the short product with 100 cuts. In the sensory tests for "thickness when wiping with water," "absorbency when wiping with water," and "ease of wiping off oily stains," 27 testers rated how the sheets felt when actually using them on a 5-point scale (5 points for extremely excellent, 4 points for excellent, 3 points for average, 2 points for slightly poor, 1 point for poor), and then rounded off to the nearest tenth place to evaluate the results. The method for measuring "paper thickness reduction rate due to wetting" is as described above. "Water absorption" and "oil absorption" were measured as follows. The physical properties, measured values ​​and evaluations for each example are shown in Table 1 below.

[0040] [Water absorption] The water absorption was measured according to the following (1) to (5). (1) Measure the mass of the test piece using an electronic balance (such as A&D HR300). (2) Pour 25°C water into a tray larger than the test specimen (e.g., inner dimensions: 215 mm x 160 mm) to a depth of approximately 20 mm. (3) The test piece is spread out on a rigid flat net (e.g., 120 mm x 120 mm, mesh size 15 mm) that is larger than or equal to the test piece, and then lowered into the tray containing the water so that the test piece is immersed in the water so that it comes into contact with the water surface. (4) When the water has soaked the surface of the test piece sufficiently, raise the flat net just above the water surface. Leave it as it is for 30 seconds, then pick up a corner of the test piece with tweezers. . (5) After 30 seconds, the mass of the test piece that has absorbed water is measured using an electronic balance and calculated using the following formula: 2 Calculate the amount of water absorbed per unit. Water absorption (g / m 2 ) = ((Mass of the water-absorbed test piece measured in (4) above) - (Mass of the test piece measured in (1) above)) x 100 (Note: m 2 (Multiply by 100 to convert to

[0041] [Oil absorption amount] The oil absorption was measured as follows (1) to (5). (1) Measure the mass of the test piece using an electronic balance (such as A&D HR300). (2) In a tray larger than the test specimen (for example, inner dimensions: 215 mm x 160 mm), pour salad oil (Nissin Salad Oil: manufactured by Nisshin Oillio Group, Ltd.) at 25°C to a depth of approximately 20 mm. (3) The test piece is spread out and placed on a rigid flat net (e.g., 120 mm x 120 mm, mesh size 30 mm) that is larger than or equal to the test piece, and then lowered into the tray containing the salad oil so that the test piece is immersed in the oil so that it comes into contact with the oil surface. (4) When the salad oil has soaked into the surface of the test piece, raise the flat net directly above the oil surface and leave it there for 30 seconds. Then, pick up a corner of the test piece with tweezers and transfer the test piece to a pre-weighed measurement container. 。 (5) The mass of the measuring vessel containing the test piece is measured using an electronic balance, and the mass of the test piece after oil absorption is calculated by subtracting the mass of the measuring vessel from the measured mass. Then, the mass of the test piece after oil absorption is calculated by the following formula: 2 The oil absorption per unit is calculated. Oil absorption (g / m 2 ) = ((Mass of the oil-absorbed test piece measured in (4) above) - (Mass of the test piece measured in (1) above)) x 100 (Note: m 2 (Multiply by 100 to convert to

[0042] [Table 1]

[0043] There is no significant difference in water absorption or oil absorption when comparing the Examples of the present invention with Commercial Products 2 and 3, which have shorter winding lengths. In addition, the bulk is lower than Commercial Products 1, 2, and 3, but is equal to or greater than Commercial Product 1, and each Example is comparable to Commercial Products 2 and 3 in paper thickness and bulk. A characteristic feature is the reduction rate of the paper thickness when wet (under a pressure of 4.9 kPa). The reduction rate of the Examples is significantly lower than that of Commercial Products 1 to 3. Cellulose fibers swell when wet, and the interfiber bonds decrease, so that the wavy and embossed shapes of the sheet are flattened under pressure, and the bulk (paper thickness) decreases. In the case of this reduction rate of paper thickness when wet, the evaluation of "thickness when wiped with water" is particularly high, and the evaluation is better than that of Commercial Products 2 and 3, which have high paper thickness and bulk. Commercial Products 2 and 3 are only slightly bulkier, but because the reduction rate of paper thickness when wet is high, the unevenness caused by the embossing process when wet is more likely to be crushed than in the Examples, which is thought to have led to the lower evaluation. In this embodiment, by adjusting the tension and paper quality appropriately using the winder, the rate of reduction in paper thickness when wet is small, and the kitchen paper wrapped around it has an excellent sense of thickness, especially when wet, even though it is a long length, resulting in a kitchen paper roll that is not likely to lose its feel when used for wiping purposes. [Explanation of symbols]

[0044] 1...kitchen paper, 100...kitchen paper roll, 11A, 11B...sheet (crepe paper), 12a...embossed recesses, 12b...embossed protrusions, 13...adhesive, L1...roll diameter, L2...width of kitchen paper roll, L4...outer diameter of paper tube.

Claims

1. A kitchen paper roll in which kitchen paper is wound into a roll, The roll length is 25 to 35 m. The kitchen paper is a two-ply sheet having embossed projections, the two plies being integrated and nested together with the projection-forming surfaces facing each other; Basis weight per ply: 18-25g / m ２ and The thickness of the five 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:

2. The roll width is 200 mm or more, Roll density is 0.12 to 0.15 g / cm ３ That is, The kitchen paper roll according to claim 1.

3. 3. The kitchen paper roll according to claim 1 or 2, having a dry tensile strength (vertical) 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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