Kitchen paper roll

Abstract

We provide kitchen paper rolls that offer excellent design and oil absorption even with long roll lengths. [Solution] The basis weight per ply is 15.0 to 23.0 g / m². 2 The problem is solved by a kitchen paper roll in which two sheets of paper are laminated and have an embossed surface, the roll length is 22 to 32 m (pitch x number of cuts), the paper thickness is 1.5 mm / 5 sheets to 2.2 mm / 5 sheets, the embossing is in a tip-to-tip form where the tops of the convex parts of each sheet face each other, and the ratio of the embossing depth of the concave part on the unwinding side (D front) to the embossing depth of the concave part on the unwinding side (D back) (D front / D back) is 1.2 to 1.7.

Description

[Technical Field]

[0001] This invention relates to kitchen paper rolls. [Background technology]

[0002] In recent years, paper roll products have been getting longer. This is also true for kitchen paper rolls. This is due to advantages such as ease of transport after purchase, reduced frequency of purchase and replacement, and convenience in storage space. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-044385 [Overview of the project] [Problems that the invention aims to solve]

[0004] While increasing the length can be achieved by increasing the roll diameter, this increases the space required for portability, storage, and sales. Therefore, it is desirable to increase the length while maintaining a winding diameter similar to that of conventional products.

[0005] To increase the length without increasing the diameter, methods such as reducing the basis weight of the sheet, making it thinner, and tightening the roll winding are considered. However, simply reducing the basis weight, making it thinner, and tightening the winding can result in a thin, easily torn sheet, and the difference in quality compared to conventional, non-long-length products may lead to consumer dissatisfaction.

[0006] Furthermore, some kitchen paper products have embossed surfaces to create irregularities in appearance and absorbency. When these embossed products are tightly wound, the irregularities and gaps between sheets can be crushed, resulting in an undesirable texture. Liquid absorption amount The quality may not be achieved in some cases.

[0007] Therefore, the main problem of the present invention is, Liquid absorption amount The objective is to provide a kitchen paper roll that is of sufficient quality, has a reduced diameter due to its length, and features an embossed surface. [Means for solving the problem]

[0008] A kitchen paper roll that solves the above problems has the following characteristics. The basis weight per ply is 15.0 to 23.0 g / m². 2 The sheets are laminated in two layers. A roll of kitchen paper with an embossed surface, The roll length is 22-32m (pitch x number of cuts), and the paper thickness is 1.5mm / 5 sheets to 2.2mm / 5 sheets. The embossing has a tip-to-tip shape where the tops of the protrusions on each sheet face each other. The oil absorption performance value is 33.0 to 43.0. , This is a kitchen paper roll characterized by the following features. [Effects of the Invention]

[0009] According to the present invention, Liquid absorption amount This method provides a kitchen paper roll with sufficient quality, while minimizing the increase in diameter due to its length and incorporating an embossed texture. [Brief explanation of the drawing]

[0010] [Figure 1] This is a diagram illustrating the basic structure of a kitchen paper roll. [Figure 2] This is a partial cross-sectional view of an embossed shape according to an embodiment. [Figure 3] This is a partial plan view of the embossed part according to the embodiment. [Figure 4] These are schematic plan view and cross-sectional view diagrams of the section used to explain embossing depth measurement. [Modes for carrying out the invention]

[0011] Next, embodiments of the present invention will be described in detail below while referring to the drawings. As shown in FIG. 1, the kitchen paper roll 1 is formed by winding a two-ply strip-shaped kitchen paper 10 around a paper tube (also referred to as a core) 20 in a roll shape.

[0012] The winding length is 22 to 32 m, preferably 25 m to 28 m. The winding diameter L2 is desirably 105 to 125 mm, and particularly desirably 110 to 120 mm.

[0013] While a commercially available two-ply kitchen paper roll 1 is generally about 10 to 15 m, according to the kitchen paper roll 1 of the present invention, the winding length is as long as 22 to 32 m, and since the preferred winding diameter L2 is 105 to 125 mm, it is highly convenient for carrying after purchase and is convenient for storage space.

[0014] The winding length in the kitchen paper roll is a value calculated by (cut pitch) × (number of cuts). In the kitchen paper roll 1, perforations 12 are formed at a predetermined interval so that it is easy to cut at a predetermined interval for easy use like single sheets. The distance L4 between these perforations 12 is the cut pitch. The cut pitch is about 18 to 25 cm. The kitchen paper roll of the embodiment is also within this range.

[0015] The number of cuts is the number of sheet-like kitchen papers obtained by cutting with the perforations 12 and corresponds to the number of sheets. In a conventionally common kitchen paper roll, it is about 50 to 70 cuts. The desirable number of cuts in this embodiment is 90 to 180 cuts, and a more desirable number of cuts is 100 to 140 cuts. The increase in the number of cuts results in a longer length.

[0016] The winding diameter L2 is measured at three locations in the width direction of the outer periphery of the roll using a diameter rule (Muratec KDS Co., Ltd.) and obtained as the average value of the three locations.

[0017] The roll width L1 is not limited, but can be set to 200-230 mm, similar to commercially available products. The roll width is determined by measuring the axial length of the outer circumference of the roll at three points on the outer circumference using a JIS Class 1 ruler and taking the average value.

[0018] The core diameter L3 is not necessarily limited, but is generally considered to be between 35 and 45 mm. The core diameter is a factor in adjusting the winding density, which will be discussed later. The core diameter is determined by measuring the outer circumference of the core at three points in the width direction using the diameter rule (Muratec KDS Co., Ltd.) and taking the average of the three measurements.

[0019] The kitchen paper 10 according to this embodiment consists of two sheets 10A and 10B made of crepe paper laminated in a two-ply structure, and the sheets 10A and 10B have an embossed surface. A steel rubber type embossing is preferred for the embossing. As shown in Figure 2, the embossing is in a tip-to-tip form, where the top of the convex portion 11A of the first sheet 10A, which constitutes one side of the kitchen paper 10, faces the top of the convex portion 11B of the second sheet 10B, which constitutes the other side. Another known form of embossing is a nested form, where the top of the convex portion of the first sheet, which constitutes one side of the kitchen paper, faces the non-convex portion of the second sheet, which constitutes the other side. In the nested form, since the convex portions of each sheet do not face each other, the bulk (thickness) of the sheet can be reduced without reducing the sheet basis weight compared to the tip-to-tip form. While it seems suitable for longer lengths, the narrower gaps between sheets tend to reduce oil absorption. In particular, when the length is increased and the material is tightly wound, the gaps between sheets are more likely to collapse, and the decrease in oil absorption will likely become more pronounced.

[0020] In the case of kitchen paper, the first sheet 10A and the second sheet 10B may be bonded together at the tops of the protrusions that touch each other. The adhesive 10C can be any known adhesive used in kitchen paper with a laminated structure. For example, polyvinyl alcohol, starch, modified starch, cellulose-based adhesives such as carboxymethylcellulose, etc.

[0021] This form of kitchen paper roll 1 employs a tip-to-tip embossed pattern, which tends to increase the bulk of the kitchen paper 10 and makes it difficult to produce long rolls. Liquid absorption amount To ensure sufficient quality while suppressing the increase in diameter due to the lengthening of the roll, the embossed surface shape and winding method were devised. Specifically, in this form of kitchen paper roll 1, the embossing is in a tip-to-tip shape where the tops of the convex parts 11A and 11B of each sheet 10A and 10B face each other, and the ratio (D front / D back) of the embossing depth of the concave part 13A on the unwinding side (D front: indicated by the symbol L6 in Figure 2) to the embossing depth of the concave part 13B on the winding inner side (D back: indicated by the symbol L7 in Figure 2) is set to 1.2 to 1.7. In Figure 2, the first sheet 10A is the unwinding side, and the second sheet 10B is the winding inner side (the side closer to the paper core). This difference in depth can be achieved by varying the embossing depth of the recesses. Methods for achieving this include, for example, using metal embossing rolls with different engraving (mainly the height of the raised areas) to emboss the sheet, varying the nip width (nip pressure) during embossing, or changing the application of the marriage roll and nip roll between the front and back sides when laminating the sheets. It is particularly desirable to apply the marriage roll to the second sheet 10B on the inner side after winding following lamination. However, the method is not limited to these examples.

[0022] This configuration minimizes the unevenness caused by embossing and the crushing of gaps between sheets in the kitchen paper roll 1 of this form, which results from the tight winding due to the increased length. Oil absorption amount It is thought that the decrease will be small. It is also thought that the difference in depth of the embossed recesses on the front and back of the base paper creates a difference in tension and deformation between the front and back of the sheet when it is wound up, making it easier to wind into a roll.

[0023] The specific values ​​for the embossing depth of the recess 13A on the winding-out side (D front) and the embossing depth of the recess 13B on the winding-inside side (D back) are not necessarily limited, but the embossing depth of the recess 13A on the winding-out side 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 recess 13B on the winding-inside side 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 this range... oil absorption It is easy to secure.

[0024] The depth of the embossed recesses 13A and 13B is measured using a Keyence Corporation VR-3200 one-shot 3D measuring microscope or an equivalent instrument, and image analysis software "VR-H1A" or an equivalent software. The measurement is performed under conditions of 12x magnification and a field of view of 24 mm × 18 mm. However, the magnification and field of view can be appropriately changed depending on the size of the emboss (recess). The emboss depth is determined by line roughness measurement. The specific measurement procedure is explained with reference to Figure 4, where the above software is used to obtain the "emboss depth (measurement curve) profile Q2" at the line segment Q1 that crosses the longest part of the periphery of one of the recesses 13A and 13B in the image area (part X in the figure) shown from a planar viewpoint. From the "emboss depth (measurement curve) profile Q2" shown in the image area (Y section in the figure) from this viewpoint, the two recessed edge points P1 and P2 that have the strongest upward curvature are extracted, and the minimum depth of the area between these recessed edge points P1 and P2 is found and defined as the minimum depth Min. Furthermore, the average of the depth values ​​of the recessed edge points P1 and P2 is defined as the maximum depth Max. Then, the emboss depth is calculated as Max - Min. However, the "emboss depth (measurement curve) profile Q2" is corrected by "automatic correction" to account for the undulation of the sheet and use the corrected profile curve. For measurement, the depth of the recess is defined as the average of 10 points at a position 10% from the outermost edge at the start of use. The two recessed edge points P1 and P2 that have the strongest upward curvature are selected visually. In selecting them, the contour E in the planar view image of the recesses 13A and 13B being measured may be used as a reference.

[0025] The kitchen paper 10 of this embodiment is embossed, but the embossing pattern is not necessarily limited. The embossing can be any suitable pattern. As an example of a preferred embossing pattern, as shown in Figure 3, a pattern can be exemplified having a substantially rectangular embossed section 40 with multiple recesses arranged therein, and a non-embossed section 50 located between them. The shape of the embossed section may be a square, rectangle, rhombus, circle, etc. The area of ​​a single embossed section 40 is not necessarily limited, but is between 3 and 16 cm².2 Examples include the following. The number of recesses 13A and 13B within the embossed section can be approximately 10 to 100. The non-embossed section 50 is defined as the part between the embossed sections 40 with no recesses and a width L8 of 3.0 to 10.0 mm.

[0026] The kitchen paper 10 according to this embodiment has a basis weight of 15.0 to 23.0 g / m² per ply. 2 It is said that the amount is preferably 16-21 g / m². 2 The basis weight is according to JIS P 8124 (1998). However, the basis weight value is calculated by measuring the basis weight of kitchen paper 10 and dividing it by the number of layers, i.e., 2 sheets. This range of basis weight is considered low for kitchen paper. If the basis weight is too high, the roll length must be shortened, and conversely, if it is too low, it leads to a decrease in strength, making the paper feel thin when used. In the kitchen paper 10 according to this embodiment, due to the configuration of the recesses described above, even with a low basis weight, Oil absorption amount It is considered to be of sufficient quality in that regard.

[0027] The kitchen paper 10 according to this 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 plies stacked) is less affected by the crushing of the unevenness caused by embossing during measurement. However, if the paper thickness of 5 sheets is excessively thick, the roll length must be shortened, and conversely, if it is excessively thin, it will lead to a decrease in strength, making the thinness of the paper more noticeable during use. The paper thickness is measured by thoroughly humidifying the test piece under the conditions of JIS P 8111 (1998), and then measuring it under the same conditions using a dial thickness gauge (thickness measuring instrument) "PEACOCK G type" (manufactured by Ozaki Seisakusho). The paper thickness is measured without peeling off each ply. The specific measurement procedure is as follows: confirm that there is no dust or debris between the plunger and the measuring platform, lower the plunger onto the measuring platform, move the dial thickness gauge to zero, then raise the plunger and place the sample on the test platform, slowly lower the plunger and read the gauge reading at that time. At this time, the plunger should only be placed on top. The terminal of the plunger is made of metal and has a circular surface with a diameter of 10 mm that strikes perpendicular to the paper surface, and the load when measuring the thickness is approximately 70 gf for 120 μm. The thickness is the average value obtained by taking 10 measurements. In this embodiment, when using the paper thickness value per sheet of kitchen paper, for example, the value used in calculating the roll density is the value for 5 sheets divided by 5.

[0028] The kitchen paper 10 according to this embodiment achieves a high value of 33.0 to 43.0 for oil absorption performance, as shown in formula (1) below, due to the configuration described above, particularly the embossed features. Formula (1)...[Oil absorption performance value] = Oil absorption amount [g / m²] 2 ]×[Roll Density] / 1 ply (g / m²) 2 ). Roll density = (2-ply paper thickness × roll length) / ((roll diameter radius) 2 ×π - (radius of the paper tube diameter) 2 It is calculated by multiplying by π. In other words, a higher roll density results in a tighter winding, making the embossed texture more easily flattened and reducing oil absorption. On the other hand, reducing the basis weight and thus the paper thickness, Roll density To improve Let Even with these measures, a decrease in basis weight is expected to reduce oil absorption. Therefore, considering these points, a kitchen paper roll can be said to have high oil absorption performance if it falls within the range of the above-mentioned [oil absorption performance value]. A comparison with commercially available and conventional products will be discussed later.

[0029] The roll density of the kitchen paper roll 1 in the embodiment is not limited, but is preferably 1.20 or less, and more preferably 0.95 to 1.19. If the roll density is excessively high, the embossing is likely to be crushed, as described above. Double embossing is particularly susceptible to this effect.

[0030] The oil absorption amount in the embodiment is measured as follows (1) to (5). (1) After curing the test specimen in a 105°C dryer for 3 minutes, measure the mass of the test specimen using an electronic balance (e.g., A&D HR300). The size of the test specimen is 100 mm x 100 mm. (2) Place salad oil at 25°C (Nisshin Salad Oil: manufactured by Nisshin Oillio Group Ltd.) into a tray larger than the test specimen (for example, inner dimensions: 215 mm x 160 mm) to a depth of about 20 mm. (3) The test specimen is spread out on a rigid flat mesh (for example, 120 mm x 120 mm, 30 mm mesh) that is larger than the test specimen, and then lowered into the tray containing the salad oil so that the test specimen is in contact with the oil surface. (4) Once the salad oil has sufficiently permeated the surface of the test specimen, raise the flat mesh straight above the oil surface and leave it still for 26-27 seconds. Then, using tweezers, grasp the corner of the test specimen and transfer it to the pre-weighed measuring container. At this time, do not exceed 30 seconds from the time the flat mesh is raised above the oil surface and left still until the specimen is transferred to the measuring container. (5) The mass of the measuring container containing the test specimen is measured using an electronic balance, and the mass of the test specimen after oil absorption is calculated by subtracting the mass of the measuring container from the measured value. Then, 1 m2 Calculate the oil absorption amount per hit. Oil absorption amount (g / m 2 ) = ((Mass of the oil-absorbed test piece measured in (4) above) - (Mass of the test piece after 3-minute curing measured in (1) above)) × 100 (Note: 100 times that of one test piece of 100 cm 2 )

[0031] The tensile strength of the kitchen paper 10 of the embodiment is not necessarily limited, but the tensile strength in the longitudinal direction is preferably 650 to 1350 cN / 25 mm, more preferably 780 to 1220 cN / 25 mm, and the tensile strength in the transverse direction is preferably 250 to 550 cN / 25 mm, more preferably 320 to 480 cN / 25 mm. Note that the tensile strength indicates the tensile strength when dry (dry tensile strength). If the tensile strength is within this range, it can be said that it is the strength required during use. Note that the tensile strength is measured according to JIS P 8113:2006 using a test piece with a paper width of 25 mm.

[0032] The fiber materials of the sheets 10A and 10B of the embodiment are pulp fibers, and the pulp composition can adopt known compositions in the kitchen paper 10. It is preferably to contain 9-% to 100% by mass of virgin pulp. The pulp composition in which the effects peculiar to the present invention are remarkable is a mixture of softwood pulp such as NBKP (needle kraft pulp) or NUKP (needle unbleached pulp) and hardwood pulp such as LBKP (hardwood kraft pulp) or LUKP (hardwood unbleached pulp) in an appropriate ratio. It is preferably a pulp composition with a higher composition of softwood pulp than hardwood pulp. In particular, the ratio of softwood pulp: hardwood pulp is preferably 50:50 to 80:20. Since softwood pulp has a longer fiber length than hardwood pulp, in a pulp composition containing a large amount of softwood pulp, liquid easily diffuses along the long pulp fibers of softwood pulp, and the effects of the present invention are particularly likely to be manifested. Also, since a firm texture is likely to appear, it is suitable for the usage mode of kitchen paper used particularly for wiping or absorbing liquids.

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

[0034] Furthermore, the toilet paper used in each example was assumed to be drawn from kitchen paper. The physical properties and composition values ​​for each example are shown in Table 1.

[0035] (delete)

[0036] [Table 1]

[0037] According to the results in Table 1, the example tends to absorb more oil than Comparative Examples 1, 2, 5, and 6, which are nested materials with higher basis weights. In the nested material, the roll length is about 21m, which is about the same as Example 1, which is over 26m in Comparative Example 1, where the embossed recesses are deeper. In the nested material, it tends to be difficult to achieve sufficient length and oil absorption. Furthermore, although the embossed recesses in the example are shallow and the basis weight is low, the oil absorption capacity is sufficient compared to the comparative example. Looking at the oil absorption performance values, Comparative Example 2 has a high basis weight and a long winding length, but because it is nested, the oil absorption performance of the roll as a whole is low. Comparative Example 3 has a high basis weight and is tip-to-tip, but because it is short in winding length, the oil absorption performance of the roll as a whole is low. Furthermore, comparing the example with Comparative Example 4, Comparative Example 4 has lower oil absorption. Even with tip-to-tip construction, simply increasing the roll length by reducing the basis weight is thought to decrease oil absorption. Also, the oil absorption performance of the entire roll is not sufficiently improved. While there is some crushing of the embossing and distortion of the embossing shape, it is also thought that the proximity of the paper layers in areas other than the recesses caused by the embossing, that is, the crushing of the gaps between the sheets, is a contributing factor. The above As shown in the embodiments, the configuration of the present invention allows for Liquid absorption amountThis method provides a kitchen paper roll with sufficient quality, while minimizing the increase in diameter due to its length and incorporating an embossed texture. [Industrial applicability]

[0038] The kitchen paper roll of the present invention can be used not only in households but also for commercial purposes (for example, in airport cafeterias, hospitals, etc., where it is used by a large 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...Paper tube diameter of toilet roll, L1...Width of kitchen paper roll, L4...Cut pitch, 10C...Adhesive, L6...D front, L7...D back 40... Embossed section, 50... Non-embossed section, 11A, 11B... protruding section, 13A, 13B... recessed section, L8... width of the non-embossed section.

Claims

1. The basis weight per ply is 15.0 to 23.0 g / m². ２ The sheets are laminated in two layers. A roll of kitchen paper with an embossed surface, 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 has a tip-to-tip shape where the tops of the protrusions on each sheet face each other. The ratio (Dfront / Dback) of the embossing depth of the recess on the outer side of the winding (Dfront) to the embossing depth of the recess on the inner side of the winding (Dback) is between 1.2 and 1.

7. A kitchen paper roll characterized by the following features.

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