Kitchen paper roll

Abstract

To provide a kitchen paper roll excellent in design property and oil absorption property even if a winding length is long.SOLUTION: The problem in the conventional kitchen paper roll is solved by providing a kitchen paper roll in which sheets with a basis weight of 15.0 to 23.0 g / m2 per ply are laminated in two plies, and kitchen paper with embossed irregularities is rolled up, wherein a winding length is 22 to 32 m (pitch×the number of cuts), a paper thickness is 1.5 mm / 5 sheets to 2.2 mm / 5 sheets, the embossing is in the form of tip toe tips where tops of convex portions of each sheet face each other, and a ratio (D front / D back) of an embossing depth of a recess on a winding outer surface side (D front) to an embossing depth of a recess on a winding inner surface side (D back) is 1.2 to 1.7.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a kitchen paper roll. [Background technology]

[0002] In recent years, paper roll products have become longer, including kitchen paper rolls. This is due to the advantages of paper rolls, such as ease of transport after purchase, reduced frequency of purchase and replacement, and convenient storage space. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-044385 Summary of the Invention [Problem to be solved by the invention]

[0004] To increase the length, it is sufficient to increase the roll diameter, but a larger diameter requires more space for portability, storage, and sales. Therefore, it is desirable to increase the length while keeping the roll diameter at the same level as conventional products.

[0005] To increase the length without increasing the diameter, it has been considered to reduce the basis weight and thickness of the sheet and to wind it tightly. However, simply reducing the basis weight, thickness and winding it tightly makes the sheet thin and prone to tearing, and the difference in quality compared to conventional products that are not long may cause dissatisfaction among consumers.

[0006] Furthermore, some kitchen paper has a textured surface formed by embossing to improve design, liquid absorption, etc. When this textured surface is embossed and rolled up tightly, the textured surface and the gaps between sheets can be crushed, making it difficult to achieve the desired design, liquid absorption, and other qualities.

[0007] Therefore, the main object of the present invention is to provide a kitchen paper roll that has sufficient quality in terms of design and liquid absorption, is prevented from becoming large in diameter due to being made long, and has unevenness due to embossing. [Means for solving the problem]

[0008] The kitchen paper roll that solves the above problems has the following features. The basis weight of one ply is 15.0 to 23.0 g / m 2 The sheets are laminated in two plies, A kitchen paper roll in which the kitchen paper having embossed unevenness is wound up, The roll length is 22 to 32 m (pitch x number of cuts), and the paper thickness is 1.5 mm / 5 sheets to 2.2 mm / 5 sheets. The embossing is in a tip-to-tip form, in which the tops of the protrusions of each sheet face each other, The ratio (D front / D back) of the embossed depth of the recess on the unwinding surface side (D front) to the embossed depth of the recess on the winding inner surface side (D back) is 1.2 to 1.7. This is a kitchen paper roll characterized by the above. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a kitchen paper roll that has sufficient quality in terms of design and liquid absorption, is prevented from becoming larger in diameter due to being longer, and has unevenness due to embossing. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic explanatory diagram of a kitchen paper roll. [Figure 2] FIG. 2 is a partial cross-sectional view of an embossment according to an embodiment. [Figure 3] FIG. 3 is a partial plan view of an embossment according to the embodiment. [Figure 4] 1A and 1B are a plan view and a cross-sectional view of an embossing depth measurement explanation portion, respectively. DETAILED DESCRIPTION OF THE INVENTION

[0011] Next, embodiments of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, a kitchen paper roll 1 is made by winding two plies of strip-shaped kitchen paper 10 around a paper tube (also called a tube core) 20 in a roll shape.

[0012] The winding length is 22 The winding diameter L2 is preferably 105 to 125 mm, and more preferably 110 to 120 mm.

[0013] While commercially available two-ply kitchen paper rolls 1 are generally about 10 to 15 m long, the kitchen paper roll 1 of the present invention has a fairly long roll length of 22 to 32 m and a preferred roll diameter L2 of 105 to 125 mm, making it easy to carry after purchase and convenient to store.

[0014] The winding length of a kitchen paper roll is a value calculated by multiplying the cutting pitch by the number of cuts. The kitchen paper roll 1 has perforations 12 formed to allow it to be easily cut at predetermined intervals for easy use like sheets. The distance L4 between these perforations 12 is the cutting pitch. The cutting pitch is approximately 18 to 25 cm. The kitchen paper roll of this embodiment also falls within this range.

[0015] The number of cuts is the number of sheets of kitchen paper obtained by cutting along the perforations 12, and corresponds to the number of sheets. In The number of cuts is about 50 to 70. In this embodiment, the number of cuts is preferably 90 to 180, and more preferably 100 to 140. The length increases as the number of cuts increases.

[0016] The winding diameter L2 is determined by measuring the outer circumference of the roll at three locations in the width direction using a diameter rule (Muratec KDS Co., Ltd.) and calculating the average value of the three locations.

[0017] The roll width L1 is not limited, but can be 200 to 230 mm, similar to commercially available products. The roll width is calculated by measuring the axial length of the outer peripheral surface of the roll at three points on the outer periphery of the roll using a JIS Class 1 metal ruler and averaging the measured values.

[0018] The cardboard tube diameter L3 is not necessarily limited, but is set to 35 to 45 mm. The cardboard tube diameter is a factor in adjusting the winding density, which will be described later. The cardboard tube diameter is calculated by measuring the outer circumference of the cardboard tube at three points in the width direction using a diameter rule (Muratec KDS Co., Ltd.) and taking the average value of the three points.

[0019] The kitchen paper 10 according to this embodiment is formed by laminating two plies of crepe paper sheets 10A and 10B, each of which has an embossed texture. Steel-rubber embossing is preferred. As shown in FIG. 2, the embossing is a tip-to-tip pattern, in which the peaks of the convex portions 11A of the first sheet 10A constituting one side of the kitchen paper 10 face the peaks of the convex portions 11B of the second sheet 10B constituting the other side. Another known embossing pattern is a nested pattern, in which the peaks of the convex portions of the first sheet constituting one side of the kitchen paper face the non-convex portions of the second sheet constituting the other side. Because the convex portions of the sheets do not face each other in the nested pattern, the bulk (thickness) of the sheet can be reduced without reducing the sheet basis weight, compared to the tip-to-tip pattern. Although it seems to be suitable for long lengths, the gaps between sheets become narrower, which tends to reduce the oil absorption. In particular, when the sheet is wound tightly due to long lengths, the gaps between sheets are easily crushed, which makes the decrease in oil absorption more pronounced.

[0020] In the kitchen paper, the first sheet 10A and the second sheet 10B may be bonded together at the tops of the convex portions where they contact each other. The adhesive 10C can be any known adhesive used in kitchen paper with a laminated structure. Examples include cellulose adhesives such as polyvinyl alcohol, starch, modified starch, and carboxymethyl cellulose.

[0021] The kitchen paper roll 1 of this embodiment employs a tip-to-tip embossing pattern, which tends to make the kitchen paper 10 bulky and difficult to produce in long lengths. The embossing pattern and winding method have been devised to prevent the diameter from increasing due to long lengths while maintaining sufficient quality in terms of design and liquid absorption. Specifically, the kitchen paper roll 1 of this embodiment has a tip-to-tip embossing pattern, in which the peaks of the convex portions 11A and 11B of the sheets 10A and 10B face each other. The ratio (D-face / D-back) of the embossing depth of the concave portions 13A on the unwinding surface (D-face: indicated by reference character L6 in FIG. 2) to the embossing depth of the concave portions 13B on the rewinding inner surface (D-back: indicated by reference character L7 in FIG. 2) is 1.2 to 1.7. In FIG. 2, the first sheet 10A is on the unwinding surface, and the second sheet 10B is on the rewinding inner surface (the side closest to the paper tube). This difference in depth can be achieved by varying the embossing depth of the recesses, and methods for achieving this include, for example, embossing the sheet using metal embossing rolls with different engravings (mainly the height of the protrusions), varying the nip width (nip pressure) during embossing, or changing the way in which the marriage rolls or nip rolls are applied to the front and back of the sheets when laminating them. In particular, it is desirable to apply the marriage rolls to the second sheet 10B on the inside surface of the roll after lamination. However, the method is not limited to these examples.

[0022] This configuration is thought to minimize the unevenness caused by embossing and the crushing of gaps between sheets that occurs when the kitchen paper roll 1 of this embodiment is tightly wound due to a long length, ensure the design (embossing clarity) of the sheet 10A on the unwinding side, and minimize the decrease in oil absorption. It is also thought that the difference in depth of the embossed depressions on the front and back of the base paper causes differences in tension and deformation between the front and back of the sheet during winding, making it easier to wind into a roll.

[0023] The embossing depth of the recesses 13A on the unwinding surface (D front) and the embossing depth of the recesses 13B on the winding inner surface (D back) are not necessarily limited to specific values, but the embossing depth of the recesses 13A on the unwinding surface of the first sheet 10A (D front) is preferably 0.060 to 0.765 mm, more preferably 0.102 to 0.493 mm, and particularly preferably 0.120 to 0.255 mm. The embossing depth of the recesses 13B on the winding inner surface of the second sheet 10B (D back) is preferably 0.050 to 0.450 mm, more preferably 0.085 to 0.290 mm, and particularly preferably 0.100 to 0.150 mm. Within these ranges, design and oil absorbency are easily ensured.

[0024] The depth of the embossed recesses 13A and 13B is measured using a Keyence Corporation One-Shot 3D Measuring Macroscope VR-3200 or equivalent and image analysis software "VR-H1A" or equivalent. Measurements are performed at a magnification of 12x and a field of view of 24mm x 18mm. However, the magnification and field of view can be changed as needed depending on the size of the embossment (recess). The embossment depth is determined by measuring line roughness. The specific measurement procedure is described with reference to Figure 4. Using the software, an "embossment depth (measurement curve) profile Q2" is obtained along a line segment Q1 that intersects the longest part of the periphery of one of the recesses 13A and 13B in the image area (part X in the figure) shown in plan view. From the "emboss depth (measurement curve) profile Q2" of the image portion (part Y in the figure) shown from this viewpoint, the two recess edge points P1 and P2, where the upward convexity is most pronounced, are extracted, and the minimum depth value of the portion sandwiched between these recess edge points P1 and P2 is calculated as the minimum depth value Min. Furthermore, the average of the depth values of the recess edge points P1 and P2 is calculated as the maximum depth value Max. The emboss depth is then calculated as the maximum value Max - minimum value Min. Note that the "emboss depth (measurement curve) profile Q2" is a corrected profile curve with "automatic correction" for inclination correction to account for the waviness of the sheet. The recess depth is measured as the average value of 10 points located 10% from the outermost edge at the start of use. The two recess edge points P1 and P2, where the upward convexity is most pronounced, are selected visually. The contour E in the planar perspective image of the recesses 13A and 13B being measured may also be used as a reference for this selection.

[0025] The kitchen paper 10 of the embodiment is embossed, but the embossing pattern is not necessarily limited. The embossing can be any suitable embossing pattern. As an example of a preferred embossing pattern, as shown in FIG. 3, there is a pattern having a substantially rectangular embossed section 40 in which a plurality of recesses are arranged, and a non-embossed section 50 located between them. The shape of the embossed section may be a square, rectangle, diamond, circle, or the like. The area of one embossed section 40 is not necessarily limited, but is preferably 3 to 16 cm.2 The number of recesses 13A, 13B in the embossed section can be, for example, about 10 to 100. The non-embossed section 50 is a portion between the embossed sections 40 where there are no recesses and the width L8 is 3.0 to 10.0 mm.

[0026] The kitchen paper 10 according to the embodiment has a basis weight of 15.0 to 23.0 g / m 2 The preferred range is 16 to 21 g / m 2 The basis weight is based on JIS P 8124 (1998). However, the basis weight value is calculated by measuring the basis weight of 10 sheets of kitchen paper and dividing this by the number of sheets stacked, i.e., 2 sheets. This basis weight range is low for kitchen paper. If the basis weight is too high, expensive If the roll length is too short, the strength will decrease and the paper will feel thin when used. The kitchen paper 10 according to this embodiment has sufficient quality in terms of the design of the recesses and oil absorption capacity, even at a low basis weight, due to the configuration of the recesses described above.

[0027] The kitchen paper 10 according to the embodiment has a paper thickness of 1.5 mm / 5 sheets to 2.2 mm / 5 sheets. This paper thickness is measured by stacking the next 5 cuts, excluding the first cut from the end of the roll. The paper thickness of 5 sheets stacked (10 ply stacked) is less affected by the crushing of unevenness due to embossing during measurement. However, if the paper thickness is too thick, the roll length must be shortened, and conversely, if the paper thickness is too thick, thinThis leads to a decrease in strength, making the paper feel thinner during use. Paper thickness is measured by thoroughly conditioning the test specimen under the conditions specified in JIS P 8111 (1998) and then using a PEACOCK G-type dial thickness gauge (thickness measuring device) (manufactured by Ozaki Seisakusho) under the same conditions. Paper thickness is measured without removing each ply. The specific measurement procedure involves confirming that there is no dust or dirt between the plunger and the measuring table, lowering the plunger onto the measuring table, adjusting the dial thickness gauge's scale to the zero point, then raising the plunger and placing the sample on the testing table. The plunger is then slowly lowered and the gauge reading is taken. The plunger's terminal is made of metal, and its 10 mm diameter circular flat surface is placed perpendicular to the paper surface. The load during thickness measurement is approximately 70 gf at 120 μm. The thickness is the average value obtained by performing 10 measurements. In the embodiment, when the value of the paper thickness per sheet of kitchen paper is used, for example, the value in calculating the roll density is the value obtained by dividing the value for a stack of five sheets by five.

[0028] The kitchen paper 10 according to the embodiment achieves a high oil absorption value (oil absorption capacity value) of 33.0 to 43.0 due to the above-described configuration, particularly the embossing characteristics, as calculated by the following formula (1): Formula (1) [oil absorption capacity value (oil absorption capacity value)] = oil absorption amount [g / m 2 ] x [roll density] / grams per ply (g / m 2 ). Roll density = (2-ply paper thickness x roll length) / ((roll radius) 2 ×π-(radius of paper tube diameter) 2 × π). In other words, if the roll density is high, the roll will be tightly wound, making the unevenness caused by the embossing more likely to be crushed, resulting in a decrease in oil absorption. On the other hand, even if the roll density is improved by reducing the paper thickness through a decrease in the basis weight, the oil absorption will likely decrease due to the lower basis weight. Therefore, taking these points into consideration, it can be said that the oil absorption performance of the kitchen paper roll as a whole is high when the value of the [oil absorption performance value (oil absorption performance value)] is within the above range. A comparison with commercially available and conventional products will be made later.

[0029] The roll density of the kitchen paper roll 1 of this embodiment is not limited, but is preferably 1.20 or less, and more preferably 0.95 to 1.19. If the roll density is too high, the embossing is likely to be crushed, as mentioned above. This is particularly true for double embossing.

[0030] The oil absorption amount in this embodiment is measured as follows (1) to (5). (1) After curing the test piece in a dryer at 105°C for 3 minutes, measure the mass of the test piece using an electronic balance (such as A&D HR300). The size of the test piece is 100 mm x 100 mm. (2) In a tray (for example, inner dimensions: 215 mm x 160 mm) larger than the test specimen, salad oil (Nissin salad oil: manufactured by Nisshin Oillio Group, Inc.) at 25°C is placed to a depth of about 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 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) Once the salad oil has soaked into the surface of the test piece, raise the flat net directly above the oil surface, leave it there for 26 to 27 seconds, then pick up a corner of the test piece with tweezers and transfer it to a pre-weighed measuring container. At this time, do not exceed 30 seconds from the time the flat net is raised above the oil surface and left to stand until it is transferred to the measuring container. (5) The mass of the measuring container containing the test piece is measured using an electronic balance, and the mass of the measuring container is subtracted from the measured value to calculate the mass of the test piece after oil absorption. Then, 1 m 2 The oil absorption per unit is calculated. Oil absorption (g / m 2 ) = ((Mass of oil-absorbed test piece measured in (4) above) - (Mass of test piece after 3 minutes of curing measured in (1) above)) × 100 (Note: One test piece is 100 cm 2 100 times)

[0031] The tensile strength of the kitchen paper 10 of this embodiment is not necessarily limited, but the tensile strength in the machine direction is preferably 650 to 1350 cN / 25 mm, more preferably 780 to 1220 cN / 25 mm, and the tensile strength in the cross direction is preferably 250 to 550 cN / 25 mm, more preferably 320 to 480 cN / 25 mm. The tensile strength refers to the tensile strength when dry (dry tensile strength). Tensile strengths within these ranges can be said to be the strength required for use. The tensile strength is measured in accordance with JIS P 8113:2006 using a test piece with a paper width of 25 mm.

[0032] The fibrous material of the sheets 10A and 10B in the embodiment is pulp fiber, and the pulp composition can be any known composition for kitchen paper 10. It is preferable that the pulp contains 90 to 100 mass% virgin pulp. A pulp composition that exhibits the unique effects of the present invention is one in which softwood pulp, such as NBKP (softwood kraft pulp) or NUKP (softwood unbleached pulp), is blended with hardwood pulp, such as LBKP (hardwood kraft pulp) or LUKP (hardwood unbleached pulp), in an appropriate ratio. It is preferable that the pulp composition contains more softwood pulp than hardwood pulp. It is particularly preferable that the ratio of softwood pulp to hardwood pulp is 50:50 to 80:20. Since softwood pulp has longer fibers than hardwood pulp, liquids tend to diffuse along the long softwood pulp fibers in pulp compositions containing a large amount of softwood pulp, making the effects of the present invention particularly apparent. Furthermore, firm stiffness is readily apparent, making the paper particularly suitable for use as kitchen paper for wiping or absorbing liquids.

[0033] The effects of the kitchen paper roll according to the present invention will be further described below with reference to examples and comparative examples of the kitchen paper roll 1. [Example]

[0034] The toilet paper used in each example was extracted from kitchen paper. The physical properties and composition of each example are shown in Table 1.

[0035] Furthermore, Example 2 and Comparative Example 4 were compared in a sensory evaluation test regarding the clarity of the embossing on the sheet on the unwinding side. The test was conducted by 17 people, and the average of the scores of 15 people, excluding the highest and lowest scores, was used as the evaluation score. The evaluation was conducted by using Comparative Example 4 as the standard and evaluating Example 2. That is, scores were assigned as follows: 4 points for the same as Comparative Example 4, 5 points for slightly good, 6 points for good, 7 points for very good, 3 points for slightly poor, 2 points for poor, and 1 point for very poor, and the average was calculated to make the judgment.

[0036] [Table 1]

[0037] According to the results in Table 1, the Examples tend to have higher oil absorption than the nested Comparative Examples 1, 2, 5, and 6, which have higher basis weights. For the nested examples, the winding length is about 21 m, and for Comparative Example 1, which has deep embossed recesses, it is about the same as Example 1, which is over 26 m. For the nested examples, it tends to be difficult to achieve sufficient length and oil absorption. Furthermore, although the depth of the embossed recesses is shallow and the basis weight is low in the Examples, the oil absorption is more sufficient than in the Comparative Examples. Looking at the oil absorption performance values, Comparative Example 2 has a high basis weight and a long winding length, but is nested, so the oil absorption performance is low when viewed as a whole roll. Comparative Example 3 has a high basis weight and tip-to-tip, but is short in winding length, so the oil absorption performance is low when viewed as a whole roll. Furthermore, when comparing the Examples and Comparative Example 4, Comparative Example 4 has a lower oil absorption. Even in tip-to-tip applications, simply increasing the winding length to reduce the basis weight is thought to reduce the oil absorption. Furthermore, the oil absorption performance of the entire roll is not sufficiently improved. While the embossing is crushed and the embossed shape is distorted, another factor is thought to be the proximity of the paper layers in areas other than the embossed recesses, i.e., the collapse of the gaps between the sheets. In addition, the result regarding the clarity (design) of the embossment on the surface layer gave Example 2 a score of 4.6 points, which was higher than Comparative Example 4. The sum of the depths of the recesses on the front and back was deeper in Comparative Example 4, but the embossed of clear degree The results showed that Example 2 was better. As shown in the above embodiment, the configuration of the present invention allows: meaning It is possible to provide a kitchen paper roll that has sufficient quality in terms of design and liquid absorption, prevents the diameter from increasing due to lengthening, and has unevenness due to embossing. [Industrial Applicability]

[0038] The kitchen paper roll of the present invention can be used for home use as well as for commercial use (for example, in airport cafeterias and hospitals where it is used by an unspecified number of people). [Explanation of symbols]

[0039] 1...Kitchen paper roll, 10...Kitchen paper, 10A, 10B...Crepe paper, 12...Perforation, 20...Paper tube (core), L2...Diameter of kitchen paper roll, L3...Toilet roll Paper tube diameter (core diameter) , L1...width of kitchen paper roll, L4...cutting pitch, 10C...adhesive glue, L6...D front, L7...D back 40...embossed section, 50...non-embossed section, 11A, 11B...convex portions, 13A, 13B...concave portions, L8...width of non-embossed section.

Claims

[Claim 1] The basis weight of one ply is 15.0 to 23.0 g / m ２ The sheets are laminated in two plies, A kitchen paper roll in which the kitchen paper having embossed unevenness is wound up, The roll length is 22 to 32 m (pitch x number of cuts), and the paper thickness is 1.5 mm / 5 sheets to 2.2 mm / 5 sheets. The embossing is in a tip-to-tip form, in which the tops of the protrusions of each sheet face each other, the ratio (D front / D back) of the embossed depth of the recesses on the unwinding surface side (D front) to the embossed depth of the recesses on the winding inner surface side (D back) is 1.2 to 1.7; A kitchen paper roll characterized by:

Images