JP6985323B2 - Toilet Paper - Google Patents

Description

The present invention relates to toilet paper.

With the spread of shower toilets, which are also called toilets with a washing function, toilet paper is required to be suitable for use in shower toilets (Patent Document 1 below).

Since a large amount of water adheres to the skin when the cleaning function is used, it is important that the toilet paper has a high wiping property, especially high water absorption, on the skin to which a large amount of water has adhered.

However, the conventional toilet paper has a problem that when it is wiped off after using the cleaning function, it gets wet and tears due to the moisture adhering to the skin, and the moisture permeates into the hands.

Also, in shower toilets, it is possible to increase the number of plies in order to increase the durability and thickness and give consumers a sense of security when using it, but toilet paper is limited in diameter when used as a toilet roll. Therefore, if the number of plies is increased, it is necessary to reduce the thickness per ply, and if the number of plies is excessively increased, the plies on the surface layer are easily torn by the moisture adhering to the skin. In addition, if the toughness and thickness are excessively increased, the texture will be deteriorated.

Patent No. 5317995 Patent No. 4776989

Therefore, the main problem of the present invention is that it has an excellent texture as toilet paper, has sufficient strength when wiping off the skin to which moisture has adhered after using the shower toilet, and has high moisture absorption with a sense of security. However, the purpose is to provide toilet paper in which moisture does not easily penetrate into the hands.

The first means to solve the above problems is
2-3 plies,
The basis weight of one ply is 15.8 to 17.8 g / m ² , and the basis weight is 15.8 to 17.8 g / m 2.
It is formed by adding 0.01 to 0.03% by mass of a transient wet paper strength agent and 0.005 to 0.15% by mass of a dry paper strength agent to the raw material pulp.
Contains polyethylene oxide,
The dry tensile strength in the vertical direction is 700 to 800 cN / 25 mm, and the dry tensile strength is 700 to 800 cN / 25 mm.
Embossed, the area of the recesses by embossing is 1.0 to 2.5 mm ² , the density of the recesses is 5.0 to 50 pieces / cm ² , and the embossing depth of the recesses is 0.1472-0. 2154 mm,
It is a toilet paper that is characterized by that.

The second means is
Ten sets of samples cured for 4 hours or more under the conditions of temperature 23 degrees ± 1 degree and humidity 50% ± 2% were stacked and fixed so as to close the hole portion of the sample table having a hole with a diameter of 10 cm. Pure water is dropped from the burette at 10 ± 2 mL / min on the portion of the sample that has closed the hole, and the drop is made when water spillage is confirmed on the lower surface side opposite to the drop surface of the sample. It is a toilet paper according to the first means, which has a water absorption amount of 1.1 to 2.0 cc, which is a value obtained by stopping and confirming the amount of the dropped water from the scale of the burette.

According to the present invention, it has an excellent texture, has sufficient strength when wiping off the skin to which moisture has adhered after using a shower / toilet, has high moisture absorption with a sense of security, and moisture penetrates into the hand. Difficult toilet paper is provided.

It is a perspective view of the toilet roll which concerns on embodiment of this invention. It is a schematic diagram for demonstrating the procedure of measuring the embossing depth which concerns on this invention.

The toilet paper according to this embodiment is 2-ply or 3-ply. That is, two or three sheets are stacked. If the number of plies exceeds 3 plies, it is necessary to make 1 ply thinner in the case of a general toilet roll product form, and the paper thickness as a whole can be increased, but let's use a shower toilet in particular. When the moisturized skin is wiped off, the ply on the surface layer is easily torn.

As shown in FIG. 1, the product form of the toilet roll referred to here is a form in which a strip-shaped toilet paper 10 is wound in a roll shape around a paper tube (also referred to as a tube core) 20 to 20 to 40 m. be. The toilet roll has a winding diameter L2 (diameter) 110 to 115 mm. The winding diameter of the toilet roll is defined as 120 mm or less in JIS P 4501, and the holder for setting a general toilet roll is created based on this 120 mm. The toilet roll of the present invention can have a winding diameter of 110 to 115 mm, and can be sufficiently set in a general holder. Here, the winding diameter is a value measured using a dialmeter rule manufactured by Muratec KDS Co., Ltd. or an equivalent machine thereof. The measured value is an average value measured at three locations by changing the location in the width direction. The average value of the same production lot product is the average value of 5 rolls.

On the other hand, in the toilet paper according to the present embodiment, the basis weight per ply is 15.8 g / m ² or more and 17.8 g / m ² or less. If the basis weight of 1 ply is within this range, it can be made sufficiently difficult to tear in the case of the above 2 or 3 plies.

On the other hand, in the toilet paper according to the present invention, it is desirable that 75 to 90% by mass of the constituent fibers are pulp derived from hardwood. Hardwood-derived pulp has a short fiber length and tends to improve the texture of the paper surface. As will be described later, the toilet paper according to the present invention has two or three plies and a plurality of plies, and has a high drying paper strength. Such toilet paper tends to have a hard feeling, but when the pulp derived from hardwood is 75% by mass or more, the smoothness is improved and the hardness tends to be hard to feel at the time of use. As the pulp derived from hardwood, LBKP, LUKP, LOKP and the like are known, but bleached LBKP is desirable. As the fiber other than the pulp derived from hardwood, it is desirable that the pulp is derived from softwood. In this case, chlorine bleached NBKP is desirable.

On the other hand, the toilet paper according to the present invention includes a transient wet paper strength agent and a dry paper strength agent. The dry tensile strength is increased by containing the dry paper force agent. Further, as the dry tensile strength increases, the water absorption also increases. However, if the dry tensile strength is increased only with a dry paper strength agent, the water decomposability deteriorates, and the paper becomes hard and the texture and usability tend to deteriorate. On the other hand, the transient wet wipes do not dissolve due to short-term contact with water during wiping, and have sufficient water solubility for a sufficient amount of water accumulated in the trap in the water-based toilet. The paper strength is slightly reduced compared to when only the dry paper strength agent is used to improve the texture. In the present invention, by including a transient wetting paper strength agent together with a dry paper strength agent, the texture as toilet paper is excellent, and when wiping off the moist skin after using the shower toilet. It is a toilet paper that has sufficient strength, has high moisture absorption with a sense of security, and does not allow moisture to penetrate into the hands. Here, as a specific dry tensile strength, in the toilet paper according to the present invention, the dry tensile strength in the vertical direction is 700 to 800 cN / 25 mm. This dry tensile strength is more than twice as high as that of a general-purpose type toilet paper generally available on the market. As mentioned above, if this paper strength is achieved only by adding a dry paper strength agent, the paper becomes hard and the texture and usability tend to deteriorate. It has the above-mentioned excellent effects.

The water absorption amount of the toilet paper according to the present invention is preferably 1.1 to 2.0 cc. This water absorption is more than twice as high as that of general-purpose toilet paper that is generally on the market. The toilet paper according to the present invention contains a transient wetting paper strength agent and a dry paper strength agent, and the dry tensile strength in the vertical direction is 700 to 800 cN / 25 mm, so that such a high water absorption amount can be obtained. can. This amount of water absorption is an amount that the inspection paper can hold water when water is dropped onto the stacked samples at a constant speed. As a measurement method, as a pretreatment, the sample is placed in a constant temperature and humidity chamber and cured under the conditions of a temperature of 23 degrees ± 1 degree and a humidity of 50% ± 2% for 4 hours or more. Stack 10 sets of samples in the form of a product, place them on a sample table, and fix them. The sample table is a table with a hole having a diameter of 10 cm, and the sample can be fixed so as to close the hole portion. In addition, the lower surface side of the portion where the hole of the sample is closed can be visually confirmed. Next, after fixing the sample on the sample table, pure water is dropped from the burette at 10 ± 2 mL / min while gazing at the lower surface side of the sample. Stop dripping when water spillage is confirmed on the lower surface side opposite to the dripping surface of the sample, and check the amount of dripping water from the scale of the burette to determine the amount of water absorption.

The dry tensile strength in the lateral direction is preferably 200 cN / 25 mm or more and 350 cN / 25 mm or less. Here, the vertical direction of the paper is also called the MD direction, and is the flow direction at the time of papermaking. The horizontal direction of the paper is also called the CD direction, and is a direction orthogonal to the flow direction (MD direction) at the time of papermaking. The dry tensile strength according to the present invention is a value measured based on JIS P 8113 (2006), and is measured as follows. The test piece used is cut to a width of 25 mm (± 0.5 mm) x a length of about 150 mm in both the vertical and horizontal directions. The test piece is measured with multiple plies. As the testing machine, a load cell tensile testing machine TG-200N manufactured by Minebea Co., Ltd. and an equivalent machine equivalent thereto are used. The gripping interval is set to 100 mm, and the tensile speed is set to 100 mm / min. The measurement is performed by tightening both ends of the test piece to the grip of the testing machine, applying a tensile load to the paper piece in the vertical direction, and reading the indicated value (digital value) when the paper breaks. Five sets of samples are prepared in each of the vertical and horizontal directions and measured five times each, and the average of the measured values is taken as the dry tensile strength in each direction.

Further, it is desirable that the toilet paper according to the present invention has a wet tensile strength in the vertical direction of 50 cN / 25 mm or more and 90 cN / 25 mm or less. It is desirable that the wet tensile strength in the lateral direction is 25 cN / 25 mm or more and 40 cN / 25 mm or less. The wet tensile strength is a value measured based on JIS P 8135 (1998), and is measured as follows. The test piece used is cut to a width of 25 mm (± 0.5 mm) x a length of about 150 mm in both the vertical and horizontal directions. If the toilet paper has multiple plies, measure with multiple plies. As the testing machine, a load cell tensile testing machine TG-200N manufactured by Minebea Co., Ltd. and an equivalent machine equivalent thereto are used. The gripping interval is set to 100 mm, and the tensile speed is set to 50 mm / min. As the test piece, a test piece that has been cured in a dryer at 105 ° C. for 10 minutes is used. After tightening both ends of the test piece to the grip of the testing machine, use a flat brush soaked in water to apply water horizontally to the center of the test piece with a width of about 10 mm, and then immediately move it up and down with respect to the piece of paper. A tensile load is applied to the paper, and the measurement is performed by reading the indicated value (digital value) when the paper breaks. Five sets of samples are prepared in each of the vertical and horizontal directions and measured five times each, and the average of the measured values is taken as the wet tensile strength in each direction.

It is desirable that the dry paper strength enhancer in the toilet paper according to the present invention is added in an amount of 0.005 to 0.15 mass with respect to the raw material pulp. The type of the dry paper force agent is not necessarily limited, and examples thereof include starch, polyacrylamide, CMC (carboxymethyl cellulose) or a salt thereof, sodium carboxymethyl cellulose, calcium carboxymethyl cellulose, and zinc carboxymethyl cellulose. Among them, a particularly desirable dry paper strength enhancer is adjusted so that the vertical dry tensile strength of a sheet ^{having a basis weight of 16.0 to 17.5 g / m 2 when 0.01% by mass is added is in the range of 600 to 700 cN / 25 mm.} Is to be done.

It is desirable to add 0.01 to 0.03% by mass of the transient wetting paper strength agent in the toilet paper according to the present invention to the raw material pulp. The transient wetting agent is not necessarily limited, but is limited to polyamide polyamine epichlorohydrin resin, urea resin, acid colloid / melamine resin, heat-crosslinkable coating PAM, TS-20 manufactured by Seikou PMC Co., Ltd., polyacrylamide glycylated. , Polymer aldehyde-functional compounds such as cationic glyoxylated polyacrylamide, copolymers of acrylamide monomers modified with divalent aldehydes of glioxal and other copolymerizable unsaturated monomers, or dialdehyde starch. Among them, a particularly desirable transient wetting paper strength agent has a dry tensile strength in the vertical direction of a sheet ^{having a basis weight of 16.0 to 17.5 g / m 2 in the range of 500 to 600 cN / 25 mm when 0.02% by mass is added.} It is adjusted to. A more desirable transient wet paper strength agent has a basis weight adjusted to the range of 600 to 700 cN / 25 mm when 0.02% by mass is added and 0.01% by mass of a dry paper strength agent is added. The dry tensile strength of the .5 g / m ² sheet in the vertical direction is further increased to the range of 700 to 800 cN / 25 mm.

Further, the toilet paper according to the present invention may contain polyethylene oxide. The texture of the surface becomes good, and it is easy to obtain sufficient strength when wiping off the skin to which moisture has adhered. In particular, polyethylene oxide should have a molecular weight of more than 60,000.

On the other hand, it is desirable that the toilet paper according to the present invention is not coated with a moisturizer and is substantially not coated with a moisturizer. The moisturizer as an external additive according to the present invention is a polyol that reduces the paper strength by absorbing moisture. For example, glycerin. However, it cannot be denied that the above-mentioned components are contained as long as the effect is not worthy of being a moisturizing toilet paper.

To the toilet paper according to the present invention, a softening agent or a softening moisturizer that determines the softness and paper strength of the base paper itself to be added at the time of papermaking can be appropriately added.

Here, the toilet paper according to the present invention may be embossed. The embossing pattern is not always limited. The embossing can be an appropriate embossing pattern such as micro-embossing, dot-shaped embossing, or design embossing. Suitable embossing patterns according to the present invention have a recess area of 1.0 to 2.5 mm ² , a density of 5.0 to 50 pieces / cm ² , and an embossing depth of 0.1 to 0.3 mm. be. It feels better as toilet paper. Further, the embossing may be one-ply called single embossing or embossing applied by being pressed from one surface to the convex portion in a laminated state of multiple plies, or one-ply or double embossing. It may be formed by being pushed from one surface to a convex portion in a state of being laminated with a plurality of plies to form a concave portion, and then being stacked with another sheet of one ply or a plurality of laminated plies. In the latter case, it is more desirable that the other one-ply or multiple laminated ply sheets to be stacked are also embossed so that one side becomes a recess and stacked so that the recesses are located on both sides. In the case of double embossing, an adhesive or the like may be applied to the top of the convex portion of the sheet constituting one surface to bond the two sheets. In the present invention, double embossing is particularly desirable because it tends to increase water absorption.

The embossing depth is a value measured by the one-shot 3D measurement macroscope VR-3200 manufactured by KEYENCE CORPORATION or its equivalent, and the image analysis software "VR-H1A" or its equivalent software. The measurement is performed under the conditions of a magnification of 12 times and a visual field area of 24 mm × 18 mm. However, the magnification and the viewing area can be appropriately changed depending on the size of the emboss (recess). The specific measurement procedure will be described with reference to FIG. 2. Using the above software, the longest portion of the peripheral edge of one emboss (recess) 40 in the image portion (X portion in the figure) shown from a planar viewpoint is used. Obtain the embossing depth (measured cross-sectional curve) profile at the crossing line segment Q1. From the cross-sectional curve of this embossed depth profile, λc: 800 μm (where λc is shorter than the “filter that defines the boundary between the roughness component and the waviness component” described in JIS-B0601 “3.1.1.2”). Of the "contour curve Q2" of the image part (Y part in the figure) shown from the cross-sectional viewpoint obtained by removing the surface roughness component of the wavelength with a low frequency filter, the two that are convex upward and have the strongest bending. The minimum value between the concave edge points P1 and P2 and the concave edge points P1 and P2 is obtained, and the minimum depth is set to Min. Further, the average value of the depth values of the recessed edge points P1 and P2 is defined as the maximum depth value Max. In this way, the embossing depth = maximum value Max-minimum value Min. Further, the distance (length) of the recessed edge points P1 and P2 on the XY plane is defined as the length of the longest portion. The two concave edge points P1 and P2 that are convex on the above and have the strongest bending are visually selected. In making the selection, the contour E in the image of the plane viewpoint of the embossed (recessed portion) 40 during the measurement may be referred to. Similarly, the depth of the emboss (recess) is measured for the shortest part in the direction perpendicular to the longest part, and the larger value is adopted as the depth of the emboss (recess). The above measurement is performed for any 10 embosses on the surface of the toilet paper, and the average value thereof is taken as the final embossing depth.

The area of each recess of the embossed pattern is also visually observed from a 3D image obtained by measuring with the one-shot 3D measurement macroscope VR-3200 or its equivalent machine and the image analysis software "VR-H1A" or its equivalent software. Check the contour of the embossed recess with and measure the area inside the contour. This is done for any 10 embosses on the surface of the toilet paper, and the average value is taken as the area of the final embossed recess.

On the other hand, it is desirable that the toilet paper according to the present invention has a paper thickness of 200 to 300 μm as a whole. By setting the paper thickness within this range, the amount of water absorption and softness are likely to be improved. To measure the thickness of toilet paper, the test piece is sufficiently adjusted under the conditions of JIS P 8111 (1998) (usually about 8 hours), and then the dial thickness gauge (thickness measuring instrument) is used under the same conditions. In the case of multiple plies using "PEACOCKH type" (manufactured by Ozaki Seisakusho), the measurement is performed with multiple plies. Specifically, make sure that there is no dust, dust, etc. between the plunger and the measuring table, lower the plunger on the measuring table, move the memory of the dial thickness gauge to set the zero point, and then set the zero point. , Raise the plunger, place the sample on the test table, lower the lever at once from the state where the plunger is opened to 700 μm, and read the gauge at that time. When the toilet paper is embossed, make sure that one concave portion (convex portion) constituting the toilet paper is within the range of the measuring table. If there are recesses with different depths, the recess with the deepest depth should be located. At the time of this measurement, the plunger is only put on and not pressed. The terminal of the plunger is made of rubber so that a circular plane having a diameter of 10 mm hits the paper plane perpendicularly, and the load at the time of measuring the paper thickness is about 70 gf. The paper thickness is an average value obtained by performing the measurement 10 times. Here, when measuring the paper thickness, crushing of the emboss (recess) is assumed, but the paper thickness according to the present invention is a value measured including such crushing, and such crushing is ignored. good. In this paper thickness measurement, the difference in paper thickness caused by the crushing of the recesses can be ignored.

Further, the toilet paper according to the present invention is preferably hydrolyzable within 40 seconds, preferably 20 seconds or more and 40 seconds or less. If the water solubility is within 40 seconds, there is little risk of clogging the pipes when running water is disposed of in a flush toilet or the like. Further, if it is 20 seconds or more, the possibility that the fibers are immediately loosened and broken even when wiping off a large amount of water after using the shower / toilet is reduced. This water solubility (easiness of loosening) is measured by JIS P 4501 (1993). For the looseness test, a 300 mL beaker containing 300 mL of water (water temperature 20 ± 5 ° C.) is placed on a magnetic stirrer, and the rotation speed of the rotor is adjusted to 600 ± 10 rotations / minute. Insert a test piece with a side of 100 ± 2 mm into it and press the stopwatch. The rotation speed of the rotor once drops to about 500 rotations due to the resistance of the test piece, and the rotation speed increases as the test piece is loosened. When this rotation speed recovers to 540 rotations, the stopwatch is stopped and the time is measured in units of 1 second. The result of easiness of unraveling is expressed by the average of 5 tests. The rotor has a disk shape with a diameter of 35 mm and a thickness of 12 mm.

Hereinafter, the effect of the toilet paper according to the present invention will be further described with reference to Examples.

Next, "water absorption" and "hydrolysis" were measured for Examples and Comparative Examples of the toilet paper of the present invention. In addition, a sensory evaluation test was conducted for "texture". In this sensory evaluation test, 10 subjects were actually used to evaluate the texture mainly related to the hard feeling such as softness and touch. The evaluation was performed on a scale of 5 with good = 5 points, slightly good = 4 points, neither = 3 points, slightly bad = 2 points, and bad = 1 point, and the average value was calculated.

In addition, the toilet paper according to each example was made by manufacturing a toilet roll and drawing it from the toilet roll. The toilet paper has double-sided recesses by double embossing. The physical characteristics and composition of each example are shown in Table 1 below.

Examples 1 and 2 according to the present invention contain both a transient wet paper strength agent and a dry paper strength agent, resulting in a very high water absorption. In Examples 1 and 2, the embossing depth was changed, but a sufficient amount of water absorption was obtained even if the embossing depth was made shallow as in Example 2. Further, Comparative Example 1 is a general-purpose type commercial product, which does not contain a transient wet paper strength agent and a dry paper strength agent. Comparing this Comparative Example 1 with Examples 1 and 2, the result was obtained that the water absorption amount was 4 times or more. Further, Comparative Example 2 contains a dry paper strength agent but does not contain a transient wet paper strength agent. The embossing depth was made deeper than that of Example 1, but the amount of water absorption was lower than that of Example 1. Comparative Example 3 contains a transient wetting paper strength agent but does not contain a dry paper strength agent. The depth of embossing was deeper than that of Example 1, but the amount of water absorption was not as high as that of Examples 1 and 2. In Comparative Example 4, the transient wetting paper strength agent was not contained, the dry paper strength agent was added, and the basis weight was further increased, but the dry tensile strength became too high and the texture was excessively deteriorated. However, the water solubility also deteriorated.

As described above, as in the embodiment of the present invention, a material having both a transient wet paper strength agent and a dry paper strength agent and having a dry tensile strength of 700 to 800 cN / 25 mm is excellent in high water absorption and texture. It is a toilet paper that has sufficient strength and texture when wiping off the skin to which moisture has adhered after using the shower toilet, has high moisture absorption with a sense of security, and does not allow moisture to penetrate into the hands. ..

1 ... Toilet roll, 10 ... Toilet paper, 20 ... Paper tube (tube core), L1 ... Toilet roll winding diameter (diameter), L2 ... Toilet roll tube core diameter, L3 ... Toilet roll width.

Claims (2)

2-3 plies,
The basis weight of one ply is 15.8 to 17.8 g / m ² , and the basis weight is 15.8 to 17.8 g / m 2.
It is formed by adding 0.01 to 0.03% by mass of a transient wet paper strength agent and 0.005 to 0.15% by mass of a dry paper strength agent to the raw material pulp.
Contains polyethylene oxide,
The dry tensile strength in the vertical direction is 700 to 800 cN / 25 mm, and the dry tensile strength is 700 to 800 cN / 25 mm.
Embossed, the area of the recesses by embossing is 1.0 to 2.5 mm ² , the density of the recesses is 5.0 to 50 pieces / cm ² , and the embossing depth of the recesses is 0.1472-0. 2154 mm,
Toilet paper that is characterized by that. Ten sets of samples cured for 4 hours or more under the conditions of temperature 23 degrees ± 1 degree and humidity 50% ± 2% were stacked and fixed so as to close the hole portion of the sample table having a hole with a diameter of 10 cm. Pure water is dropped from the burette at 10 ± 2 mL / min on the portion of the sample that has closed the hole, and the drop is made when water spillage is confirmed on the lower surface side opposite to the drop surface of the sample. The toilet paper according to claim 1, wherein the water absorption amount is 1.1 to 2.0 cc, which is a value obtained by stopping and confirming the amount of the dropped water from the scale of the burette.

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