JP7159527B2 - toilet roll - Google Patents

Description

TECHNICAL FIELD The present invention relates to a toilet roll obtained by winding one-ply toilet paper into a roll.

Toilet rolls are mainly packaged as a set of 4 rolls or 12 rolls and are commercially available. Since packaged toilet rolls are bulky, the number of toilet rolls that can be carried at the time of purchase is limited, and such restrictions limit the quantity that can be purchased at one time. Toilet rolls are sometimes stored in homes, workplaces, public facilities, etc., but it is not always possible to secure a large storage space.

Under these circumstances, a long toilet roll has been proposed in which the basis weight per sheet of toilet paper is reduced to 14 g / m ² or less and the winding length per roll is increased (for example, patent References 1 and 2), long toilet rolls have been developed in which the basis weight per sheet of toilet paper is greater than 13 g/m ² to improve texture and usability, and the roll length is increased (for example, , see Patent Document 3).

Japanese Patent Application Laid-Open No. 2006-087703 JP 2013-208297 A JP 2014-188342 A

However, if the toilet roll is elongated in this way, the winding diameter tends to increase. There is a problem that the side surface of the toilet roll tends to be rubbed against the guide rail, causing rubbing wrinkles and spoiling the cosmetic appearance. In addition, if the toilet roll is made long, not only the roll diameter but also the mass of the roll tends to increase, and when the toilet roll is transported on the conveyor, the friction with the conveyor increases due to its own weight, and wrinkles are likely to occur. I had a problem. Furthermore, when the embossed pattern is applied to the toilet paper, wrinkles are likely to occur due to the unevenness of the emboss.

In addition, when the toilet roll is elongated, the pressure applied to the inner winding area of the toilet roll increases, causing a difference in the quality of the toilet paper between the inner winding area and the outer winding area. In some cases, the feel and texture were different between the start and the end of use. Therefore, the present invention aims to provide a high-quality long toilet roll in which wrinkles due to friction due to the manufacturing process are suppressed satisfactorily, the difference in paper quality between the inner winding region and the outer winding region is small, and the replacement frequency is low. aim.

The inventors of the present invention conducted intensive research in order to solve the above problems. As a result, in a toilet roll obtained by winding one-ply toilet paper with an embossed pattern into a roll, the winding diameter, winding length, and mass of the roll can be adjusted. The inventors have found that the above problems can be solved by adjusting the parameters calculated from the measured values, and have completed the present invention. Specifically, the present invention provides the following.

(1) A first aspect of the present invention is a toilet roll obtained by winding one-ply toilet paper with an embossed pattern into a roll, the roll diameter being 90 mm or more and 110 mm or less, and the roll length being 80 m or more and 126 m. Hereinafter, the mass per roll excluding the mass of the core is 170 g or more and 300 g or less, and from 20% to 30% of the roll length of the toilet roll from the edge of the innermost roll of toilet paper when the toilet roll is unwound % is the inner winding area, and the area corresponding to 5% to 15% of the roll length of the toilet roll from the edge of the outermost roll of toilet paper when the toilet roll is unwound is the outer winding area. In the case, the values obtained by multiplying the values of the smoothness TS750 measured by the tissue softness measuring device TSA of the front and back surfaces of the toilet paper in the inner winding region are the values of the front and back surfaces of the toilet paper in the outer winding region. It is a toilet roll characterized by having a smoothness of 72% or more with respect to a numerical value obtained by multiplying each smoothness TS750 value.

(2) A second aspect of the present invention is the toilet roll according to (1), wherein the dry longitudinal tensile strength DMDT of the toilet paper based on JIS P 8113 is 2.5 N/ It is characterized by being 25 mm or more and 7.0 N/25 mm or less.

(3) A third aspect of the present invention is the toilet roll according to (1) or (2), wherein the dry transverse tensile strength DCDT of the toilet paper based on JIS P 8113 is It is characterized by being 0.7 N/25 mm or more and 3.0 N/25 mm or less.

(4) A fourth aspect of the present invention is the toilet roll according to any one of (1) to (3), wherein the toilet paper has a basis weight of 16 g/m ² or more and 22 g/m ² or less. It is characterized by

(5) A fifth aspect of the present invention is the toilet roll according to any one of (1) to (4), wherein the TS750 value of the smoothness of the back surface of the toilet paper in the inner winding region is It is characterized by being 74% or more of the TS750 value of the smoothness of the back surface of the toilet paper in the outer roll area.

(6) A sixth aspect of the present invention is the toilet roll according to any one of (1) to (5), wherein the thickness of the toilet paper in the inner winding region is equal to the thickness of the toilet paper in the outer winding region. 93% or more of the thickness of the paper.

ADVANTAGE OF THE INVENTION According to the present invention, it is possible to provide a high-quality long toilet roll in which wrinkles due to friction due to the manufacturing process are suppressed satisfactorily, the difference in paper quality between the inner winding region and the outer winding region is small, and the replacement frequency is low. can.

1 is a perspective view showing the appearance of a toilet roll according to the present invention; FIG. It is a figure which shows the picked-up image of the embossed pattern on the roll surface side. It is a figure which shows the aspect of an embossing pattern. It is a figure which shows the aspect of an embossing pattern. It is a figure which shows the aspect of an embossing pattern. It is a figure which shows the measuring method of the depth of an embossed pattern. It is a figure which shows an example of a roll winding machine. FIG. 10 is a diagram showing a photographed image of a defective product in which the inner winding side of the roll protrudes in the axial direction; It is a figure which shows typically an inner winding area|region and an outer winding area|region.

Embodiments of the present invention will be described in detail below, but the following embodiments are presented for the purpose of illustration, and the present invention is not limited to the embodiments shown below.

<toilet roll>
FIG. 1 is a perspective view showing the appearance of a toilet roll 1 according to the present invention. The toilet roll 1 of the present invention is a toilet roll 1 obtained by winding one-ply toilet paper 1x with an embossed pattern 2 into a roll, and has a roll diameter DR (outer diameter of the roll) of 90 mm or more and 110 mm or less. The winding length (winding length) is 80 m or more and 126 m or less, and the mass per roll excluding the weight of the core is 170 g or more and 300 g or less.

As shown in FIG. 9, the inner winding region F in this specification refers to the edge 1f (portion in contact with the core E) of the innermost roll of toilet paper 1x when the toilet roll 1 is unwound. An area corresponding to 20% to 30% of the winding length of the roll 1, and the outer winding area G is the area from the edge 1e of the outermost roll of toilet paper 1x when the toilet roll 1 is unwound. A region corresponding to 5% to 15% of the winding length.

Further, among the surfaces of the toilet paper 1x, the surface oriented to the outside of the roll is referred to as the roll surface 1a (or the surface 1a of the toilet paper 1x), and the surface oriented to the center of the roll is referred to as the roll back surface 1b (or the back surface of the toilet paper 1x). 1b).

[Volume length]
When the winding length of the toilet roll 1 is 80 m or more and 126 m or less, the replacement frequency of the toilet roll 1 can be reduced. In addition, by adjusting the winding length to the above range, the roll mass becomes appropriate, and when the toilet roll 1 is conveyed by the conveyor, the friction between the toilet roll 1 and the conveyor due to its own weight is suppressed, and the occurrence of rubbing wrinkles is suppressed. can do. In addition, it is possible to prevent excessive pressure from being applied to the inner roll of toilet paper 1x, and to reduce the difference in feel between the outer roll and the inner roll. Moreover, the space saving property of the toilet roll 1 can be achieved, and the winding diameter DR is maintained within an appropriate range, so that the toilet roll 1 can be sufficiently accommodated in the toilet paper holder. The winding length is preferably 90 m or more and 122 m or less, more preferably 100 m or more and 118 m or less.

[Winding diameter]
Since the winding diameter DR of the toilet roll 1 is 90 mm or more and 110 mm or less, a guide rail and the toilet roll provided in advance in the existing production line for allowing the toilet roll 1 to stand still in the process after the winding is completed. The quality of the toilet roll 1 can be improved by suppressing the rubbing with the 1 side surface and suppressing the occurrence of rubbing wrinkles, suppressing the crushing of the embossed pattern 2, and maintaining good texture and cosmetic properties. can be made In addition, the toilet roll 1 has a size that is easy to hold by hand, and the toilet roll 1 can be easily handled even by children and elderly people, and the quality is improved. The winding diameter DR is preferably 95 mm or more and 107 mm or less, more preferably 100 mm or more and 104 mm or less.

[Winding density]
In the present invention, the winding density of the toilet roll 1 is preferably 1.0 m/cm ² or more and 2.1 m/cm ² or less. Here, if the roll is wound too tightly, excessive pressure is applied to the inner roll of toilet paper 1x, and the embossing provided on the inner roll of toilet paper 1x is crushed, resulting in deterioration of cosmeticity during use and deterioration of quality. . On the other hand, if the roll is wound too weakly, the embossment will not be crushed, but the winding diameter DR will increase, making it difficult to attach the toilet roll 1 to the toilet paper holder, or the winding force of the inner winding will become too weak. , as shown in the photograph of FIG. 8, the inner winding side of the roll protrudes in the axial direction, resulting in defective products. For this reason, in this specification, the winding density is defined as a factor for expressing the winding strength of the roll.

The winding density is represented by (winding length x number of plies)/(cross-sectional area of roll). The cross-sectional area of the roll is expressed by {cross-sectional area of roll outer diameter (winding diameter DR) portion−(core outer diameter portion cross-sectional area)}. The core (paper tube) outer diameter DI is the diameter of the center hole of the roll.

For example, if the winding length is 104m, 1 ply, the winding diameter DR is 97mm, and the outer diameter of the core is 39mm, the winding density = (104m × 1) ÷ {3.14 × (97mm ÷ 2 ÷ 10) ² - 3.14 × (39mm ÷2÷10) ² }=1.68 m/cm ² . If the toilet roll 1 does not have a core, the diameter of the center hole is taken as the outer diameter of the core.

When the winding density is 1.0 m/cm ² or more and 2.1 m/cm ² or less, the winding diameter DR is positioned in an appropriate range, making it easier for the toilet roll 1 to fit in a toilet paper holder or the like, and The winding force of the winding becomes appropriate, the inner winding side of the roll does not protrude in the axial direction (the shape retention of the roll is poor), and the product is not defective. The embossing provided on the toilet paper 1x is not crushed, the beauty is maintained during use, and the quality is improved. The winding density is more preferably 1.2 m/cm ² or more and 1.9 m/cm ² or less, and even more preferably 1.4 m/cm ² or more and 1.7 m/cm ² or less.

[Basis Weight/Paper Thickness]
The basis weight of the toilet paper 1x is preferably 16 g/m ² or more and 22 g/m ² or less, and the paper thickness at this time is preferably 0.5 mm/10 ply or more and 1.2 mm/10 ply or less. When the basis weight and the paper thickness are within the above ranges, the touch and feel of the toilet roll 1 are well maintained. In addition, the roll mass is in an appropriate range, and when the toilet roll 1 is conveyed by the conveyor, the friction between the toilet roll 1 and the conveyor due to its own weight can be suppressed, and the occurrence of rubbing wrinkles can be suppressed.

The basis weight per ply of the toilet paper 1x is more preferably 17 g/m ² or more and 21 g/m ² or less, and even more preferably 18 g/m ² or more and 20 g/m ² or less. The thickness of the toilet paper 1x is more preferably 0.6 mm/10 ply or more and 1.1 mm/10 ply or less, and further preferably 0.7 mm/10 ply or more and 0.9 mm/10 ply or less. As a method of adjusting the basis weight and paper thickness per ply of toilet paper 1x within the above ranges, a method of defining embossing conditions can be mentioned.

In addition, the paper thickness (per 10 plies) of the toilet paper 1x in the inner winding region F is preferably 93% or more of the paper thickness (per 10 plies) of the toilet paper 1x in the outer winding region G, 94 % or more, more preferably 95% or more. Since the paper thickness of the toilet paper 1x in the inner winding area F with respect to the outer winding area G is within the above range, a difference in feel and texture can be felt when comparing the time when the toilet roll 1 is started and when it is finished using. can be made difficult. The paper thickness of the toilet paper 1x in the inner winding region F is smaller than the paper thickness of the toilet paper 1x in the outer winding region G because pressure is applied.

[Embossed pattern]
A toilet roll 1 (toilet paper 1x) of the present invention is embossed and has an embossed pattern 2. As shown in FIG. A single embossed pattern is preferable as the embossed pattern 2 of the toilet paper 1x of the present invention. A single ply of toilet paper 1x may be embossed a plurality of times. The single embossed pattern is formed by pressing the embossing protrusions of the embossing roll 111 only from one side of the 1-ply toilet paper 1x, and the surface of the toilet paper 1x pressed against the embossing roll 111 is concave and the back side is convex. An embossed pattern 2 (single embossed pattern) in which a part appears is formed. The material of the embossing roll 111 is preferably metal.

FIG. 3 is a drawing showing a mode of the embossed pattern 2. As shown in FIG. As shown in FIG. 3, the lines connecting the centers of gravity of the embossed patterns 2 in the machine direction MD and the width direction W are substantially straight lines, and the distance between the adjacent embossed patterns 2 in the machine direction W is the distance in the machine direction MD. greater than the separation distance in By forming the embossed pattern 2 in such a manner, as shown in FIG. 2, an appearance having a plurality of linear patterns along the flow direction MD is obtained, which is excellent in appearance. Further, when using the toilet roll 1, it is normal to use the toilet paper 1x by pulling it in the machine direction MD while holding it by hand. By making the separation distance larger than the distance in , the touch and the feeling of fitting to the fingertips are improved, and the tactile sensation during use is improved.

Moreover, the inclination of the line connecting the center of gravity of the embossed pattern 2 to the flow direction MD with respect to the line parallel to the flow direction MD is preferably 0° or more and 10° or less. FIG. 4 is a drawing showing the embossed pattern 2 when the inclination of the line connecting the center of gravity of the embossed pattern 2 to the machined direction MD is 13° with respect to the line parallel to the machined direction MD. In this way, when the embossed pattern 2 is formed such that the inclination of the line connecting the center of gravity of the embossed pattern 2 to the machine direction MD with respect to the line parallel to the machine direction MD is more than 10°, the thickness of the toilet roll 1 becomes Since the recesses and recesses and the protrusions and protrusions of the embossed patterns 2 of the toilet paper 1x that overlap each other in the direction are difficult to overlap, the embossing is likely to be crushed, and the tactile sensation and cosmeticity are impaired during use. In particular, when a long toilet roll is wound like the toilet roll 1 of the present invention, the toilet paper is processed with a strong tension, so the embossing is stretched, and the cosmetic appearance of the embossment is further reduced. Cheap. Therefore, in order to make it easier to overlap the recesses and recesses of the embossed patterns 2 and the protrusions to the protrusions of the overlapping toilet paper 1x, and to prevent the embossed patterns 2 from collapsing, the embossing for the line parallel to the flow direction MD is performed. The inclination of the line connecting the center of gravity of the pattern 2 to the flow direction MD is preferably 0° or more and 10° or less, more preferably 0° or more and 5° or less, and preferably 0° or more and 2° or less. More preferred. Further, from the viewpoint of making the embossed pattern 2 more difficult to collapse, as shown in FIG. In other words, it is most preferable that the line connecting the center of gravity of the embossed pattern 2 to the machine direction MD is parallel to the line parallel to the machine direction MD.

The inclination of the line connecting the center of gravity of the embossed pattern 2 to the machine direction MD with respect to the line parallel to the machine direction MD can be measured by the following method. First, the distance from either end in the width direction W to the nearest embossed pattern 2 is measured at a position pulled out 50 cm from the edge of the outermost roll of the toilet roll 1 in the machine direction. Next, it is on the line connecting the center of gravity of the embossed pattern 2 whose distance was measured from the end of the width direction W on the side where the above measurement was performed at the position further pulled out by 50 cm in the flow direction MD Measure the distance to the embossed pattern 2. In this way, the distances from the embossed pattern 2 and one end in the width direction W at two points on the line connecting the center of gravity of the embossed pattern 2 to the machine direction MD are respectively measured, and the larger of the two measured values The slope of the line connecting the center of gravity of the embossed pattern 2 to the machine direction MD can be obtained by using a numerical value obtained by subtracting a small measured value from , and the distance (50 cm) between the two points parallel to the machine direction MD.

(Area ratio and depth of embossed pattern)
In the toilet roll 1 of the present invention, the area ratio of the embossed pattern 2 (ratio of the portion of the toilet paper 1x having the embossed pattern 2) is adjusted to be 25% or more and 80% or less. By adjusting the area ratio of the embossed pattern 2 to the above range, the difference between the front and back of the embossed pattern 2 can be appropriately maintained, and the tactile sensation and cosmetic properties during use can be maintained satisfactorily. Here, the area ratio of the embossed pattern for toilet paper is usually 20% or less. By increasing the area ratio of the embossed pattern as in the present invention, the paper thickness can be reduced without calendering the base paper. Can be adjusted to any winding diameter. The area ratio of the embossed pattern 2 is more preferably 35% or more and 70% or less, and even more preferably 45% or more and 60% or less.

In addition, in the toilet roll 1 of the present invention, the depth of the embossed pattern 2 is preferably 0.01 mm or more and 0.32 mm or less, more preferably 0.04 mm or more and 0.27 mm or less, and 0.08 mm. It is more preferable that the distance is not less than 0.24 mm and not more than 0.24 mm. By adjusting the depth of the embossed pattern 2 within the above range, the difference between the front and back sides of the embossed pattern 2 can be maintained more effectively, and the tactile sensation and cosmetic properties during use can be maintained satisfactorily.

The area ratio and depth of the embossed pattern 2 are obtained by measuring the height difference of the embossed pattern 2 using a microscope. The numerical values of the above area ratio and depth are numerical values obtained by measuring only the embossed pattern 2 without reflecting the auxiliary embossed pattern 21 described later.

As a microscope, the product name "One-shot 3D measurement microscope VR-3100" manufactured by KEYENCE can be used. The product name "VR-H1A" can be used as the observation/measurement/image analysis software for the image of the microscope. In addition, measurement conditions are a magnification of 12 times and a visual field area of 24 mm×18 mm. Note that the measurement magnification and the visual field area may be appropriately changed depending on the desired size of the embossed pattern 2 . Regarding the measurement of the embossed pattern 2, the measurement surface is the roll surface 1a instead of the roll back surface 1b, and from the edge 1e of the outermost roll of the toilet paper 1x of the toilet roll 1, a predetermined value equivalent to 10% of the roll length of the toilet roll 1 , an embossed pattern 2 continuous in the width direction W is selected and measured. In addition, the area ratio and depth of the embossed pattern 2 are measured while the toilet roll 1 is in a roll shape. Here, since the toilet roll 1 has a bulky shape, it may be difficult to focus the microscope. In this case, the stage (table) on which the sample is placed may be removed and the focus may be adjusted for measurement.

FIG. 6(a) shows a height profile on the XY plane by a microscope, and it can be seen that the height of the surface of the toilet paper 1x is represented by shading. Under the profile measurement conditions, a line segment (horizontal line) is drawn across the embossed pattern 2, and as shown in FIG. A cross-sectional curve is obtained, and the graph shown in FIG. Here, the (measurement) cross-sectional curve in FIG. 6 (b-1) is a (measurement) cross-sectional curve that represents the unevenness of the surface of the toilet roll, but noise (such as there is a lump of fiber on the surface of the toilet roll, or there is no fiber) It also includes sharp peaks caused by stretched whiskers or parts without fibers), and when calculating the height difference of unevenness and calculating the area ratio shown below, such noise peaks are removed. There is a need. Therefore, the (measurement) cross-sectional curve of FIG. 6(b-1) is smoothed to obtain the cross-sectional curve of FIG. 6(b-2) by setting the filter size to ±12 using the weighted average radio button. Note that smoothing using the filter of the weighted average radio button can be obtained automatically by using the above analysis software. Then, in the graph shown in FIG. 6(b-2), the average value of the maximum values of each of the convex portion of the graph and the convex portion adjacent to the convex portion on the vertical axis is calculated. The minimum value of the vertical axis in the convex portion adjacent to the portion and the concave portion sandwiched between them is obtained. The numerical value obtained by subtracting the minimum value from the average value of the maximum values obtained in this way is taken as the depth of the embossed pattern 2, and the same measurement is performed for continuous unevenness as shown in FIG. 6(b-1). This is done for the unevenness that does not include auxiliary embossing. After that, the toilet roll is similarly measured at 90 degrees at a total of four locations, and the average value of the total of 12 locations is finally adopted as the depth of the embossed pattern 2 . In addition, the pitch in the width direction on the profile (the distance between the convex portion and the convex portion adjacent to the convex portion) is preferably 1 mm or more and 12 mm or less, more preferably 2 mm or more and 9 mm or less, and 3 mm. It is more preferable that the distance is not less than 6 mm and not more than 6 mm. By setting the pitch in the width direction within the range described above, it is possible to maintain good touch and cosmetic properties during use.

Next, a method for measuring the area ratio of the embossed pattern 2 will be described with reference to FIG. 6(c). As shown in FIG. 6(c), a line A is drawn connecting the maximum values on the vertical axis in the convex portion of the graph and the convex portion adjacent to the convex portion. A line B perpendicular to the line A is drawn from a point indicating the minimum value of the vertical axis of the concave portion sandwiched between the convex portion adjacent to the convex portion. Next, a line C parallel to the line A is drawn from the point indicating the minimum value of the vertical axis in the recess. Next, a line D perpendicularly connecting to the line C is drawn from the points corresponding to the maximum values on the vertical axis in the convex portion and the convex portion adjacent to the convex portion. Next, draw a line E parallel to lines A and C from the center point of line B. In this way, after drawing a plurality of lines, the area of the area surrounded by the lines on the graph, the line B, and the line E, that is, the sum of the areas of the areas F and G in FIG. to the area of the area surrounded by the lines of the graph, the line D, and the line E, that is, the sum of the areas of the areas H and I in FIG. The area ratio (%) of the embossed pattern 2 is obtained by dividing the area of the F and G parts by the total area and multiplying the result by 100. Therefore, in FIG. 6(c), the numerical value calculated by the formula (area of F area+area of G area)/(area of F area+area of G area+area of H area+area of both I machines)×100 is the emboss pattern. It becomes the area ratio of 2. Furthermore, the same measurement is performed for three consecutive points (the unevenness not including the auxiliary embossing is measured) for the continuous unevenness. After that, the toilet roll is similarly measured at 90 degrees at a total of four locations, and the average value of a total of 12 locations is finally adopted as the area ratio of the embossed pattern 2 . In addition, when winding a long toilet roll like the present invention, the sheet is processed with a strong tension, so the embossing is easily stretched in the machine direction, and the center of gravity of the emboss pattern 2 is in the machine direction MD and The lines connecting in the width direction W are each substantially linear, and the distance between adjacent embossed patterns 2 in the width direction W is greater than the distance in the machine direction MD, so the area ratio in the width direction is measured. The area ratio of the embossed pattern 2 has conventionally been obtained by image analysis or the like using the convex portions of the embossed pattern 2 . In the present invention, it was found that there is a correlation between the area ratio of the projections of the embossing roll and the area ratio of the above measuring method, and the area ratio of the embossed pattern was measured by the above method.

The shape of the embossed pattern 2 is not particularly limited and may be rectangular, square, round, oval, or the like. Further, the winding diameter DR and the winding density can be adjusted by appropriately adjusting the depth of the embossed pattern 2 and the area ratio (number) of the embossed pattern 2 .

By the way, as described above, when the embossed pattern 2 is formed such that the inclination of the line connecting the center of gravity of the embossed pattern 2 to the flow direction MD with respect to the line parallel to the flow direction MD is 0°, the toilet In the manufacturing process of the roll 1, the protrusions of the embossing roll 111 continue to contact a specific position of the opposing rubber roll 112, and the deterioration of the rubber roll 112 progresses at that position, the replacement frequency of the rubber roll 112 increases, and the cost increases. may be burdensome. Therefore, it is preferable to have an auxiliary embossed pattern 21 between the embossed patterns 2 adjacent in the width direction W, and to form a substantially comma shape or a substantially inverted comma shape by the embossed pattern 2 and the auxiliary embossed pattern 21 . In this specification, the auxiliary embossing pattern is defined as an embossing that has fewer depressions in the embossed portion than the non-embossed portion and is not included in the embossed pattern 2 when the toilet roll 1 is viewed in the machine direction. In addition, as shown in FIG. 5, the auxiliary embossed pattern 21 is preferably connected to the embossed pattern 2 in the width direction. FIG. 5 shows a mode in which the embossed pattern 2 and the auxiliary embossed pattern 21 form a substantially inverted comma shape. By providing the auxiliary embossing pattern 21 in this way, the projections of the embossing roll 111 come into uniform contact with the rubber roll 112, and the deterioration speed of the rubber roll 112 can be slowed down. The thickness of the auxiliary embossed pattern 21 is preferably 0.05 mm or more and 2.0 mm or less, more preferably 0.1 mm or more and 1.5 mm or less, and 0.2 mm or more and 1.0 mm or less. is more preferred. The depth of the auxiliary embossed pattern 21 is preferably 0.01 mm or more and 0.32 mm or less, preferably 0.04 mm or more and 0.27 mm or less, and 0.08 mm or more and 0.24 mm or less. The auxiliary embossed pattern 21 can be formed by appropriately adjusting the unevenness of the embossing roll 111 .

FIG. 7 shows an example of the roll winding machine 110 . The base paper roll 12 is set in a roll winding machine 110, subjected to single embossing by an embossing unit (embossing roll 111), and then wound by a winding mechanism 113 onto a wide base paper roll 13 having a winding diameter DR. be done. After that, the base paper roll 13 is cut into a predetermined width (114 mm or the like) to obtain the toilet roll 1 . The original fabric roll 12 may be subjected to calendering, but in the present invention, the embossing reduces the paper thickness and specific volume, so the need for calendering is low, and it is better not to calender. is preferable from the viewpoint of improving productivity.

The roll winding machine 110 can be broadly classified into two types: a surface type and a center type. The surface method is a method of winding while supporting a roll to be wound from the outside with a plurality of separate drive rolls, and the wound toilet roll 1 can easily control the winding diameter and can be produced at a higher speed. The center method is a method of winding by driving a shaft passed through the center of the winding roll, and the wound toilet roll 1 becomes a relatively soft product and is suitable for delicate embossed products. In the present invention, the film can be wound by any method, but the surface method is preferred. According to the surface method, the winding diameter DR and the roll softness of the toilet roll 1 can be relatively easily adjusted by the strength with which the toilet roll 1 is wound.

The depth of the embossed pattern 2 can be controlled by appropriately adjusting the nip width of the rubber roll 112 (see FIG. 7) facing the embossing roll 111 . The nip width is preferably 20 mm to 50 mm, more preferably 25 mm to 45 mm, even more preferably 30 mm to 40 mm, although it varies depending on the properties of the rolls. By setting the nip width within the above range, the difference between the front and back sides of the embossed pattern 2 can be properly maintained, and the paper thickness can be properly maintained, the winding diameter DR of the roll can be appropriately maintained, and the softness of the sheet can be improved. The thickness is also preferably maintained. The nip width can be measured using carbon paper. As for the measurement method, first, the nip of the embossing roll 111 is released, and carbon paper and general copy paper are overlapped and set. Next, the embossing roll 111 is nipped. Then release the nip and remove the carbon paper and copy paper. Since the color of the carbon paper in the portion nipped by the embossing roll 111 is transferred to the copy paper, the nip width can be measured. The material of the embossing roll 111 is preferably metal.

The depth of the emboss pattern 2 can be adjusted by narrowing the nip width if the unevenness of the embossing roll 111 is deep and widening the nip width if the unevenness of the embossing roll 111 is shallow. Also, the strength of winding the roll can be adjusted so as to ensure the depth of the embossed pattern 2 . For example, when the depth of the embossed pattern 2 increases, the embossed pattern 2 is easily crushed when the roll is wound.

Printing, embossing, perforation, tail sealing, and cutting to a predetermined width (114 mm or the like) can be simultaneously performed by the roll winding machine 110, and the toilet roll 1 can be manufactured. Furthermore, after that, the film packaging process can be performed to manufacture the package of the toilet roll 1 .

[Roll mass]
The roll mass is the mass of the toilet roll 1 per roll width (width of the roll in the direction of the core) of 114 mm, excluding the mass of the core. In the toilet roll 1 of the present invention, the mass per roll excluding the mass of the core is 170 g or more and 300 g or less. When the roll mass is within the above range, the friction between the toilet roll 1 and the conveyor due to its own weight can be suppressed when the toilet roll 1 is conveyed by the conveyor, and the occurrence of rubbing wrinkles can be suppressed. In addition, the basis weight and winding length are appropriately maintained, and the roll replacement frequency can be reduced. Also, the mass per roll excluding the mass of the core is preferably 190 g or more and 270 g or less, more preferably 200 g or more and 240 g or less.

[Core outer diameter]
In addition, the core outer diameter, which is the outer diameter of the core of the toilet roll 1 of the present invention, is preferably 35 mm or more and 45 mm or less, more preferably 37 mm or more and 42 mm or less, and 38 mm or more and 40 mm or less. More preferred. When the outer diameter of the core is within the above range, the roll density of the toilet roll 1 can be preferably maintained, and the toilet roll 1 can be easily accommodated in the toilet paper holder. The ease of handling of the toilet roll 1 is also improved. Further, the mass of the core of the toilet roll 1 is preferably 3.0 g or more and 5.7 g or less, more preferably 3.7 g or more and 5.2 g or less, and 4.2 g or more and 4.8 g or less. is more preferred. By setting the core mass within the above numerical range, it is possible to achieve good core strength and core cost suitable for long toilet paper 1x as in the present application. The mass of the core is the mass of the roll width of 114 mm, similar to the mass of the roll.

[Specific volume]
The specific volume of the toilet paper 1x is preferably 2.5 cm ³ /g or more and 6.5 cm ³ /g or less. When the specific volume of the toilet paper 1x is within the above range, the softness of the sheet is improved, the bulk (bulkness) is preferably maintained, and the water absorbency is maintained well. The winding diameter DR does not become too large. The specific volume is more preferably 2.8 cm ³ /g or more and 6.2 cm ³ /g or less, and even more preferably 3.1 cm ³ /g or more and 5.9 cm ³ /g or less.

[DMDT, DCDT]
DMDT (Dry Machine Direction Tensile strength) and DCDT (Dry Cross Direction Tensile strength) are the tensile strength in the longitudinal direction when dry based on JIS P 8113 of toilet paper 1x, and the tensile strength in the transverse direction when dry is DCDT. DMDT is preferably 2.5 N/25 mm or more and 7.0 N/25 mm or less, more preferably 3.5 N/25 mm or more and 6.0 N/25 mm or less, and 4.0 N/25 mm or more and 5.5 N/25 mm More preferably: DCDT is preferably 0.7 N/25 mm or more and 3.0 N/25 mm or less, more preferably 1.0 N/25 mm or more and 2.7 N/25 mm or less, and 1.3 N/25 mm or more and 2.5 mm or more. It is more preferably 4N/25mm or less. By adjusting the DMDT and DCDT within the above range, the occurrence of wrinkles due to friction can be suppressed, and the softness and texture can be preferably maintained, and the quality can be improved. In addition, the measurement of the tensile strength is performed under the conditions of a tensile speed of 300 mm/min. Also, the tensile strength can be adjusted by a known method.

In the above description, the direction in which the toilet paper 1x is made is defined as the "vertical direction", and the direction perpendicular to the flow direction is defined as the "horizontal direction".

[Water absorption]
The water absorbency of toilet paper 1x based on old JIS S 3104 is preferably 7.0 seconds or less, more preferably 5.0 seconds or less, and even more preferably 3.0 seconds or less. The water absorbency is preferably short-term, and the water absorbency is maintained satisfactorily within the above time range. In addition, when water is dripped, it is dripped on the surface side of the toilet paper 1x.

[Ease of loosening]
The ease of unraveling of the toilet paper 1x based on JIS P 4501 is preferably 8 seconds or more and 60 seconds or less, more preferably 15 seconds or more and 50 seconds or less, and 20 seconds or more and 40 seconds or less. preferable. The ease of unraveling is preferably a short time, and within the above time range, the water disintegration property in the toilet is maintained well, and the toilet paper 1x in the warm water washing toilet seat is water resistant when it gets wet. sex is also improved.

[Smoothness TS750]
In the toilet roll 1 of the present invention, for toilet paper 1x, it is calculated from the numerical value of the maximum peak intensity (TS750) of the first spectrum from the low frequency side, which is automatically acquired by the software on the tissue softness measuring device TSA By adjusting the parameters to be used within the following ranges, it is possible to make it difficult to perceive a difference in touch and texture when comparing the toilet roll 1 at the start of use and at the end of use. That is, in the present invention, the numerical value obtained by multiplying the value of the smoothness TS750 measured by the tissue softness measuring device TSA of each of the front surface 1a and the back surface 1b of the toilet paper 1x in the inner winding region F is the value in the outer winding region G, It is 72% or more with respect to the value obtained by multiplying the smoothness TS750 of each of the front surface 1a and the back surface 1b of the toilet paper 1x. Also, the numerical value is preferably 77% or more, more preferably 82% or more. In addition, the numerical value for the inner winding region F is smaller than the numerical value for the outer winding region G. The measurement positions of the front surface 1a and the back surface 1b in each region of the inner winding region F and the outer winding region G do not need to match as long as they are within the range of each region.

Furthermore, in order to make it more effective to make it difficult to feel the difference in touch and texture when comparing the start of use and the end of use of the toilet roll 1, the back surface 1b of the toilet paper 1x in the inner winding region F is smooth. The value of smoothness TS750 is preferably 74% or more, more preferably 79% or more, and 84% or more of the smoothness TS750 value of the back surface 1b of the toilet paper 1x in the outer winding region G. is more preferable. The numerical value for the inner winding region F is smaller than the numerical value for the outer winding region G.

The TS750 measurement method using the tissue softness measurement device TSA and the measurement device used therefor are described in detail in, for example, Japanese Unexamined Patent Application Publication No. 2013-236904. For the measuring method using the tissue softness measuring apparatus TSA, please refer to the above-mentioned patent documents.

<toilet paper>
The toilet paper 1x may consist of 100% by mass of wood pulp, and may contain waste paper pulp, non-wood pulp, and deinked pulp. In order to obtain the target quality, the content of NBKP (softwood bleached kraft pulp) is preferably 0% by mass or more and 30% by mass or less, more preferably 0% by mass or more and 20% by mass or less. More preferably, it is 5% by mass or more and 15% by mass or less. In addition, the content of LBKP (bleached hardwood kraft pulp) is preferably 30% by mass or more and 90% by mass or less, more preferably 40% by mass or more and 80% by mass or less, and 50% by mass or more and 70% by mass or less. is more preferable.

In addition, the content of waste paper pulp derived from cartons for liquid beverages such as milk cartons is preferably more than 0% by mass and 60% by mass or less, more preferably 10% by mass or more and 50% by mass or less, and 20% by mass. % or more and 40 mass % or less, and the kraft pulp content is preferably 40 mass % or more and less than 100 mass %, more preferably 50 mass % or more and 90 mass % or less. More preferably, it is at least 80% by mass.

Waste paper pulp derived from cartons for liquid beverages such as milk cartons is mainly softwood pulp, which has the advantage of easily improving the strength of toilet paper 1x. May affect product quality. By setting the content of waste paper pulp derived from cartons for liquid drinks such as milk cartons within the above range, it is possible to effectively improve the strength of the toilet paper 1x while suppressing variations in quality.

The above LBKP is preferably pulp formed from wood species belonging to the genus Eucalyptus of the family Myrtaceae, typified by Eucalyptus grandis and Eucalyptus globulus.

In the present invention, 25 parts by mass or less of deinked pulp derived from newspapers, magazines, etc. can be blended with 100 parts by mass of the waste paper pulp derived from NBKP, LBKP, and milk carton. The content of deinked pulp in toilet paper 1x (sheet) when 25 parts by mass of deinked pulp is blended is 25 parts by mass / (100 parts by mass + 25 parts by mass) x 100 = 20% by mass. . The deinked pulp content is preferably 0% by mass or more and 20% by mass or less, more preferably 0% by mass or more and 10% by mass or less, and even more preferably 0% by mass or more and 5% by mass or less. , 0% by weight. Since deinked pulp is also used paper, blending it into the pulp raw material causes large variations in the quality of the toilet paper 1x. Moreover, deinked pulp usually contains a fluorescent dye, and if the content exceeds 20% by mass, the toilet paper 1x may contain a large amount of the fluorescent dye. Therefore, the content of deinked pulp is preferably 20% by mass or less.

In addition, in order to ensure proper strength of the toilet paper 1x, the strength can be adjusted by blending the raw materials and subjecting the pulp fibers to beating treatment by a normal means. As the beating to obtain the target quality, the difference in freeness before and after beating is 0 ml or more and 150 ml or less, more preferably, at the Canadian standard freeness measured by JIS P 8121 for commercially available virgin pulp. A beating treatment for reducing the volume to 10 ml or more and 100 ml or less, more preferably 20 ml or more and 70 ml or less can be mentioned.

Toilet paper 1x can be made by blending softwood kraft pulp and hardwood kraft pulp having a certain range of fiber length and fiber roughness in a specific range when a virgin raw material is used for the paper stock. Depending on the quality required for the final product, additives to paper materials include softening agents including debonder softening agents, bulking agents, dyes, dispersants, dry paper strength agents, drainage improvers, pitch control agents, absorbency Enhancers and the like can be used. It is preferred not to use wet strength agents. When waste paper raw material is used as the material for toilet paper 1x, the same treatment as in the case of the virgin system is performed.

[Toilet paper manufacturing method]
The toilet paper 1x can be manufactured, for example, in the order of (1) papermaking and creping, and (2) embossing and roll winding, as follows. Of these, (2) has already been explained, so its explanation is omitted.

(Paper making and creping)
First, a web is made from the stock on the wire part of a known paper machine and transferred to the felt of the press part. Examples of the wire part system include a round mesh system, a fourdrinier system, a suction breast system, a short mesh system, a twin wire system, and a crescent former system.

Then, the web is mechanically compressed with a suction pressure roll, a pressure roll without suction, a press roll, or the like, or dehydration is continued by adopting a dehydration method such as through-drying with hot air. Suction pressure rolls or pressure rolls without suction are also used as a means of moving the web from the press part to the Yankee dryer.

The web transferred to the Yankee dryer is dried by the Yankee dryer and the Yankee dryer hood, creped by a creping doctor, and wound on a reel part.

Creping is the mechanical compression of paper in the machine direction (the direction of sheet travel on the paper machine). Then, when the web of toilet paper 1x is manufactured, the web on the Yankee dryer is peeled off by the creping doctor and wound by the reel part, but the speed difference between the Yankee dryer and the reel part (speed of the reel part ≤ the speed of the Yankee dryer speed) causes a crepe (wrinkles) to be formed in the creping doctor.

The quality required for the toilet paper 1x, that is, bulkiness, softness, water absorbency, surface smoothness, beauty (crepe shape), etc., depend on the speed difference. Depending on conditions such as the speed difference, the basis weight of the web on the reel after creping is approximately 17 g/m ² or more and 25 g/m ² or less, which is higher than the basis weight of the web on the Yankee dryer before creping. The basis weight is preferably 18 g/m ² or more and 24 g/m ² or less, more preferably 19 g/m ² or more and 23 g/m ² or less. If the above range is exceeded, the strength of the paper may be increased and the paper may become stiff.

Here, the crepe ratio based on the speed difference between the Yankee dryer and the reel is defined by the following equation.
Crepe rate (%) = 100 x {(Yankee dryer speed (m/min) - reel speed (m/min)}/reel speed (m/min)

Quality and workability are largely determined by the creping conditions, and operating conditions that optimize the creping conditions are important matters for those skilled in the art. In the present invention, the crepe rate when producing toilet paper 1x is preferably 10% or more and 50% or less, more preferably 15% or more and 40% or less, and further preferably 20% or more and 35% or less. preferable.

The paper thickness of toilet paper 1x before embossing is preferably 0.5 mm/10 sheets or more and 1.2 mm/10 sheets or less, more preferably 0.6 mm/10 sheets or more and 1.1 mm/10 sheets or less, still more preferably 0 .7 mm/10 sheets or more and 0.9 mm/10 sheets or less. Further, the specific volume of the toilet paper 1x in the raw fabric roll 12 before embossing is preferably 2.7 cm ³ /g or more and 6.2 cm ³ /g or less, more preferably 3.0 cm ³ /g or more and 5.9 cm ³ /g. g or less, more preferably 3.3 cm ³ /g or more and 5.6 cm ³ /g or less. Note that the paper thickness of the toilet paper 1x before embossing is the paper thickness of the raw fabric roll 12 . The paper thickness and specific volume before embossing are higher than those of the toilet roll. As described above, the embossed pattern 2 used in the present invention is suitable for long toilet rolls because the paper thickness and specific volume can be reduced by embossing.

The raw fabric roll 12 is embossed by, for example, the roll winding machine 110 shown in FIG. 7 to obtain the toilet roll 1 . In the roll winding machine 110 shown in FIG. 7, when winding the wide base-paper roll 13 by the winding mechanism 113, the winding density is determined by the rider roll for sequentially winding the sheet by pressing the base-paper roll 13 from the outer peripheral side. The pressing force of 114 can be adjusted by setting it within a predetermined range.

Although the present invention has been described using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope of the invention described in the above embodiments. It will be clear to those skilled in the art that improvements are possible. In addition, it is clear from the description of the scope of the claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

The pulp composition content (% by mass) is 10% NBKP, 60% LBKP, and 30% waste paper pulp derived from cartons for liquid beverages such as milk cartons, and does not contain deinked pulp. , toilet paper (1 ply) and toilet rolls shown in Tables 1 to 3 were manufactured. In forming the embossed patterns, the same embossing roll and rubber roll are used, and the nip width of the rubber roll facing the embossing roll is unified to 32 mm. As shown in FIG. are linear, and the distance between the adjacent embossed patterns in the width direction is greater than the distance in the machine direction, and the center of gravity of the embossed pattern with respect to the line parallel to the machine direction is set in the machine direction. The inclination of the connecting line was adjusted to 0°.

The following measurements were made. Each measurement was carried out after maintaining an equilibrium state under the temperature and humidity conditions specified in JIS P 8111 (23±1° C., 50±2% RH).

Basis weight: Measured based on JIS P8124 and converted to per sheet.

Paper thickness: Measured using a thickness gauge (dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho). The measurement conditions were a measurement load of 3.7 kPa and a probe diameter of 30 mm. In addition, 10 sheets of toilet paper were piled up and measured as 10 plies. In addition, the measurement was repeated 10 times and the measurement results were averaged. The measurement position on the roll was a position corresponding to 90% of the winding length of the toilet roll from the edge of the innermost roll of toilet paper when the toilet roll was unwound.

Specific volume: The paper thickness per sheet was divided by the basis weight per sheet, and expressed as the volume cm ³ per unit g.

Dry longitudinal tensile strength DMDT and dry transverse tensile strength DCDT: Based on JIS P 8113, the maximum load to breakage of toilet paper was measured in units of N/25 mm. The tensile strength was measured under the condition of a tensile speed of 300 mm/min.

Winding length: The length of 10 sheets was actually measured between the perforations of the toilet roll. After that, the number of roll sheets was actually measured, and the winding length was obtained by proportional calculation from the length of 10 sheets and the number of sheets. For example, if the length of 10 sheets is 1.515 m and the number of sheets is 330, then 1.515 m×(330/10)=50 m. In addition, when there was no perforation, the winding length was obtained by actual measurement.

Roll winding diameter DR, core outer diameter DI: Measured using a diameter meter rule manufactured by Muratec KDS Co., Ltd. Ten rolls were measured and the measurement results were averaged.

Roll Mass: Roll mass was measured using an electronic balance. First, the mass of the roll containing the core was measured, and then the mass of the core was measured. The mass of the core was subtracted from the mass of the roll including the core to obtain the mass of the roll. The roll mass was measured for 10 rolls and the measurement results were averaged. When the roll width was different from 114 mm, the roll mass was obtained by converting the roll width to 114 mm. For example, when the roll width is 105 mm, the mass obtained by multiplying the roll mass by a coefficient (114/105) was taken as the roll mass per roll width of 114 mm.

The winding density and TS750 were measured by the methods described above. Regarding TS750, the inner winding region is the position corresponding to 25% of the roll length of the toilet roll from the edge of the innermost roll of toilet paper when the toilet roll is unwound, and the outer winding region is the toilet roll. A position corresponding to 10% of the roll length of the toilet roll from the edge of the outermost roll of toilet paper when the roll was unwound was measured.

In addition, the numerical value (%) obtained by multiplying the TS750 value for each of the front and back surfaces of the toilet paper in the inner winding area with respect to the numerical value obtained by multiplying the TS750 value for each of the front and back surfaces of the toilet paper in the outer winding area is shown in the table. Inside, it is described as TS750 (front x back inner winding/outer winding). In addition, the TS750 value (%) of the back surface of the toilet paper in the inner winding region with respect to the TS750 value of the back surface of the toilet paper in the outer winding region is indicated as TS750 (back inner winding/outer winding) in the table. is doing.

In addition, the paper thickness (%) of the toilet paper in the inner roll region with respect to the paper thickness of the toilet paper in the outer roll region is described as paper thickness (inner roll/outer roll) in the table. In addition, when obtaining the relevant data on the paper thickness, the inner roll area is the direction toward the innermost roll, starting from the position corresponding to 25% of the roll length of the toilet roll from the edge of the innermost roll of toilet paper. 10 sheets of toilet paper were sampled and measured by the same method as above. In addition, for the outer roll region, 10 sheets of toilet paper are collected in the direction toward the outermost roll, starting from a position corresponding to 10% of the roll length of the toilet roll from the edge of the outermost roll of toilet paper, measured in the same way.

The sensory evaluation was conducted by 20 monitors by selecting "good" or "bad" for each evaluation item. Evaluation criteria are as follows. ⊚, ∘, and Δ were regarded as acceptable.
◎: 18 to 20 people rated “good” ○: 14 to 17 people rated “good” △: 10 to 13 people rated “good” ×: 6 people rated “good” When there are no more than 9 people, XX: When there is no "good" or when there are 1 or more and 5 people or less

The results obtained are shown in Tables 1 to 3.

As described above, according to the present invention, it is possible to satisfactorily suppress wrinkles caused by friction in the manufacturing process, to provide a high-quality long toilet roll that has a small difference in paper quality between the inner winding region and the outer winding region, and has a low replacement frequency. can do.

1 toilet roll 1a roll surface 1b roll back surface 1e edge of outermost roll of toilet paper 1f edge of innermost roll of toilet paper 1x toilet paper 12 base roll 13 base paper roll 110 roll winding machine 111 embossing roll 112 rubber roll 113 winding mechanism 114 rider roll 2 embossed pattern 21 auxiliary embossed pattern E core (core)
F Inner winding region G Outer winding region MD Flow direction W Width direction DR Winding diameter DI Core outer diameter

Claims (1)

A toilet roll obtained by winding one-ply toilet paper with an embossed pattern into a roll,
The winding diameter is 95 mm or more and 107 mm or less, the winding length is 94 m or more and 115 m or less, and the mass per roll excluding the weight of the core is 210 g or more and 253 g or less,
The basis weight of the toilet paper is 17.5 g/m ² or more and 20.2 g/m ² or less,
The dry longitudinal tensile strength DMDT of the toilet paper based on JIS P 8113 is 3.52 N/25 mm or more and 6.00 N/25 mm or less,
The toilet paper has a dry transverse tensile strength DCDT of 1.22 N/25 mm or more and 2.56 N/25 mm or less based on JIS P 8113,
The inner winding area is the area corresponding to 20% to 30% of the roll length of the toilet roll from the edge of the innermost roll of toilet paper when the toilet roll is unwound, and the outermost roll when the toilet roll is unwound. In the case where the area corresponding to 5% to 15% of the roll length of the toilet roll from the edge of the toilet paper is the outer winding area,
The value obtained by multiplying the smoothness TS750 of the front and back surfaces of the toilet paper in the inner winding region by the value of TS750 measured by the tissue softness measuring device TSA is the smoothness of the front and back surfaces of the toilet paper in the outer winding region. 80 % or more and 90% or less of the value obtained by multiplying the value of TS750,
The TS750 value of the smoothness of the back surface of the toilet paper in the inner winding region is 82% or more and 91% or less of the TS750 value of the smoothness of the back surface of the toilet paper in the outer winding region,
The thickness of the toilet paper in the inner winding region is 94% or more and 97% or less of the thickness of the toilet paper in the outer winding region.
toilet roll.

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