JP6914984B2 - Toilet paper and manufacturing method of toilet paper - Google Patents

Description

The present invention relates to toilet paper and a method for producing toilet paper, and more particularly to toilet paper having an embossed and printed pattern and a method for producing the same.

Some toilet paper is embossed. The embossing applied to the toilet paper includes contact embossing, nerling, edge embossing, etc., which is mainly performed to integrate multiple plies, and fine unevenness called fine micro-embossing. Is applied to the entire surface of the paper, and embossing is performed mainly to improve the smoothness of the paper surface and the softness of the paper. There is embossing that gives the paper a design with unevenness in addition to improving the bulkiness, wiping property, and softness of the paper by arranging the unevenness slightly and sparsely.

On the other hand, in toilet paper, in addition to the embossing applied to enhance the design, a colored portion is further provided on the paper surface. As for the formation of such a colored portion, in addition to the one in which the uneven portion of the emboss is colored (Patent Document 1), the one in which a pattern is formed separately from the uneven portion of the emboss by printing processing (Patent Document 2).

The latter, in which the pattern is formed by printing separately from the embossing, has an advantage that the pattern by printing is not limited by the unevenness due to the embossing.

Special Table 2003-526536 Japanese Unexamined Patent Publication No. 2008-188070 Patent No. 5317995

However, the advantage of forming a pattern by printing separately from the embossing is that, in other words, the printed pattern and the embossed uneven design are not synchronized, so that the embossed uneven portion may be arranged so as to overlap the printed portion.

Then, in the conventional toilet paper 1, as shown in FIG. 5, the design of the printed pattern or pattern is improved, for example, the ink is scraped off at the embossed uneven portion 151 overlapping the printed portion 150 to make it appear white. It could be reduced. For example, the ink on the uneven portion applied to the printed portion to which the ink is applied by printing appears to be blurred, and the unevenness on the printed portion becomes excessively conspicuous compared to the unevenness of the embossed portion applied to the non-printed portion. Sometimes it was loose (see Fig. 5) and the pattern was not what was intended.

In order to improve the deterioration of the design due to the unevenness given to the printed portion, it is conceivable to reduce the pressure at the time of embossing to make the unevenness shallow and make it inconspicuous. The depth of the unevenness of the non-printed portion also becomes shallow, and the effect of embossing other than the design, such as the bulkiness of the paper and the improvement of wiping property, is reduced.

Further, in recent years, with the spread of shower toilets, which are also called toilets with a washing function, toilet paper may be required to be suitable for use in shower toilets (Patent Document 3). When such a shower toilet is used, a large amount of water adheres to the skin, so that high water absorption is required. Increasing the dry tensile strength is one of the effective means for increasing such water absorption, but when the dry tensile strength is increased in this way, the paper becomes hard and the recesses are firmly formed during embossing. It becomes easier to enter, and the ink blurring on the uneven portion applied to the printed portion becomes more remarkable.

Therefore, the main problem of the present invention is that in toilet paper having a pattern by embossing and printing, the bulkiness of the paper and the effect of the embossing such as improvement of wiping property are not lowered, and the toilet paper has high water absorption. It is an object of the present invention to provide toilet paper and a method for producing the same, in which unevenness due to embossing does not deteriorate the design of the printed portion.

The first means according to the present invention that has solved the above problems is
Toilet paper that has irregularities due to embossing and patterns due to the application of ink, and irregularities due to embossing are formed inside and outside the range to which the ink is applied.
The embossing depth of the recesses in the inked portion is shallower than the embossing depth in the recesses in the non-inked portion, and
The embossing depth of the concave portion of the portion to which the ink is applied is 0.1 mm to 0.17 mm.
The embossing depth of the concave portion of the portion to which the ink is not applied is 0.18 mm to 0.24 mm.
The toilet paper is characterized in that the difference between the embossing depth of the concave portion of the portion to which the ink is applied and the embossing depth of the concave portion of the portion to which the ink is not applied is 0.05 mm to 0.1 mm.

The second means is
The first above, the basis weight per ply is 16.0 to 18.0 g / m ² , the paper thickness is 200 to 300 μm, and the dry tensile strength in the vertical direction is 550 to 700 cN / 25 mm. Toilet paper related to the means.

The third means is
Embossing that gives unevenness to the paper surface by passing it between an embossed roll with many convex parts arranged on the surface and a receiving roll paired with this embossed roll in a state where multiple strip-shaped toilet paper base papers are laminated. This is a method for manufacturing toilet paper, which comprises a printing process in which a pattern is printed by printing on a surface of the embossed toilet paper base paper after the processing step is performed.

The fourth means is
A single-layer strip-shaped toilet paper base paper or a stack of multiple strip-shaped toilet paper base papers is passed between an embossed roll having a large number of protrusions on the surface and a receiving roll paired with the embossed roll. The embossing process that gives unevenness to the paper surface and
Although a single-layer strip-shaped toilet paper base paper or a plurality of strip-shaped toilet paper base papers having irregularities imparted by the embossing process are laminated, another single-layer strip-shaped toilet paper base paper or a plurality of strip-shaped toilet paper base papers are laminated with respect to the convex portion forming surface. Stacking process of stacking strip-shaped toilet paper base paper,
A method for producing toilet paper, which comprises a printing step of printing a pattern on a surface of a laminated toilet paper base paper that has undergone this laminating step and in which recesses are formed.

The fifth means is
The basis weight of one toilet paper base paper is 16.0 to 18.0 g / m ² , the paper thickness after embossing is 200 to 300 μm, and the dry tensile strength in the vertical direction is 550 to 700 cN / 25 mm. It is a method for producing toilet paper according to the third or fourth means.

The sixth means is
By adjusting the embossing pressure in the embossing process and the elongation of the paper surface due to the applied ink, the embossing depth of the concave portion of the ink-applied portion is 0.1 mm to 0.17 mm, and the embossing depth of the non-ink-applied portion is set to 0.1 mm to 0.17 mm. Adjust the embossing depth of the recesses to 0.18 mm to 0.24 mm, and adjust the difference between the embossed depth of the recesses in the inked part and the embossed depth of the recesses in the non-inked part to 0.05 mm to 0.1 mm. This is a method for manufacturing toilet paper according to the third to fifth means described above.

According to the present invention, in a toilet paper having an embossed pattern and a printed pattern, the unevenness due to the embossing may reduce the design of the printed portion without reducing the effect of the embossing such as the bulkiness of the paper. No, toilet paper and its manufacturing method are provided.

It is an enlarged view of the surface of the toilet paper which concerns on this invention. It is a figure for demonstrating the measuring method of the embossing depth. It is a figure for demonstrating the toilet roll of this invention. It is a figure for demonstrating the manufacturing method of the toilet paper which concerns on this invention. It is an enlarged view of the surface of the toilet paper which concerns on this invention.

An embodiment of the present invention will be described with reference to FIGS. 1 to 4.

As shown in FIG. 1, the toilet paper of the present embodiment has a recess 12 by embossing and a pattern 11 by applying ink, and a recess by embossing is provided in and outside the range 12 to which the ink is applied. 12 is the formed toilet paper (Note that (A) in FIG. 1 is an enlarged view of a photograph of the surface of the toilet paper of the present embodiment, and (B) in FIG. 1 enhances the contrast of the photograph. It is processed so that the recesses are clear). For example, unevenness is formed on the entire surface of the paper by embossing, and patterns, patterns, characters, figures, and the like are printed with ink regardless of the unevenness. In the toilet paper according to the present invention, the embossed uneven design and the ink pattern may or may not be synchronously synchronized.

In the toilet paper of the present embodiment, the embossing depth of the concave portion of the portion to which the ink is applied is shallower than the embossing depth of the concave portion of the portion to which the ink is not applied. Therefore, the concave portion of the ink-applied portion is excessively inconspicuous as compared with the concave portion of the non-ink-applied portion, and the concave portion does not easily deteriorate the pattern design due to the ink application.

Here, when a pattern is added by printing after the unevenness is formed by the embossing process, the embossing depth of the concave portion of the portion to which the ink is applied is the depth of the concave portion of the portion to which the ink is not applied. It tends to be shallower than the embossing depth. On the contrary, when the pattern with ink is formed first, the embossing depth of the concave portion of the portion to which the ink is applied tends to be deeper than the embossing depth of the concave portion of the portion to which the ink is not applied. This is because the fibers of the ink-applied portion are hardened by the ink and the paper surface is hardened, so that when pressed by the convex portion during embossing, the shape of the convex portion is firmly transferred and a deep concave portion is formed. Because. Then, when the convex portion is pressed firmly and strongly in this way, the ink is scraped off particularly at the edge portion of the concave portion, and the concave shape becomes white in the printed pattern, and the appearance tends to deteriorate. On the other hand, the non-inked portion has a cushioning property because the fibers are not hardened by the ink, and the concave portion becomes shallower than the inked portion. When embossing is performed when the ink is not dry, the fibers tend to move easily when the ink-applied portion is wet, and the convex portions tend to be transferred firmly to deepen the depth of the concave portions. If the embossing is performed in a state where the ink is not dried, ink adheres to the embossing roll for forming the concave portion, so such a processing form is not common.

In the toilet paper of the present embodiment, the embossing depth of the concave portion of the portion to which the ink is applied is 0.1 mm to 0.17 mm. Further, the embossing depth of the concave portion of the portion to which the ink is not applied is 0.18 mm to 0.24 mm. When the embossing depth of the ink-applied portion and the non-ink-applied portion is within this range, the effects of the embossing process, such as improving the bulkiness, water absorption, and wiping property of the paper, can be sufficiently exhibited.

Further, in the toilet paper of the present embodiment, the difference between the embossing depth of the concave portion of the portion to which the ink is applied and the embossing depth of the concave portion of the portion to which the ink is not applied is 0.05 mm to 0.1 mm. Within this range, it is difficult to feel the difference in unevenness between the portion to which the ink is applied and the portion to which the ink is not applied, and the unevenness due to the embossing process does not easily deteriorate the design of the printed portion, resulting in a good appearance. As described above, in the toilet paper of the present embodiment, the embossing depth of the concave portion of the portion to which the ink is applied is shallower than the embossing depth of the concave portion of the portion to which the ink is not applied. In order to have such a difference in embossing depth, it is preferably formed when a pattern is imparted by printing after the unevenness is formed by the embossing process.

Here, the arrangement pattern of the unevenness by the embossing according to the present embodiment is not necessarily limited. Appropriate patterns such as micro embossing, dot-shaped embossing, and design embossing can be used. Preferably, the area of the recesses is 1.0 to 2.5 mm ² and the density is 5.0 to 50 pieces / cm ² . If such recesses are arranged, the effects of embossing, such as improving the bulkiness, water absorption, and wiping property of the paper, can be sufficiently exhibited. Further, the embossing may be a one-ply or a plurality of plies laminated state called single embossing, which is applied by being pressed from one surface to a convex portion, or a one-ply or a 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 laminated 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 the sheets are 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 forming one surface to bond the two sheets.

The embossing depth according to the present invention is a value measured by a one-shot 3D measurement macroscope VR-3200 manufactured by Keyence Co., Ltd. or its equivalent, and 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 embossing (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 embossing depth profile, λc: 800 μm (however, 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 concave 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 above and have the strongest bending are visually selected. In selecting the image, 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 on any 10 embosses on the surface of the toilet paper, and the average value thereof is taken as the final embossing depth. Further, the embossing depth of the concave portion in the ink-applied portion and the non-ink-applied portion is measured within a range of 30 cm.

Regarding the area of the recess due to embossing, the area of the recess is visually observed from the 3D image obtained by measuring with the one-shot 3D measurement macroscope VR-3200 or its equivalent and the image analysis software "VR-H1A" or its equivalent software. Check the contour 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, the pattern of the pattern obtained by applying ink in the present embodiment is not limited. It can be a known pattern such as characters, figures, photographs, and floral patterns. The ink may be a water-based ink or an oil-based ink. A water-based ink having a viscosity of 10 to 50 cps, a vehicle of 5 to 25% by mass, and a water content of 95 to 75% by mass by a B-type viscometer is preferably used. The occupancy rate of the pattern on the paper is also not limited. The form of applying ink is also not limited. It may be formed by appropriate printing such as flexographic printing and gravure printing. The pattern obtained by applying the ink may be applied by a known printing technique on toilet paper.

The toilet paper according to this embodiment is preferably 2-ply or 3-ply. That is, it is desirable that two or three sheets are stacked. If the number of plies exceeds 3 plies, 1 ply needs to be thinned and the paper thickness as a whole can be increased in the case of a general toilet roll product form. For example, a shower toilet is used. In such a case, when the skin with a lot of water is wiped off, the ply on the surface layer is easily torn.

As shown in FIG. 2, 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 on a paper tube (also referred to as a tube core) 20 with a length of 20 to 40 m. be. The toilet roll has a winding diameter L2 (diameter) of 110 to 116 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 116 mm, and can be sufficiently set in a general holder. Here, the winding diameter is a value measured using a dialimeter rule manufactured by Muratec-KDS Co., Ltd. or an equivalent machine thereof. The measured value is an average value measured at three locations in different locations 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, it is desirable that 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, and the above embossing depth can be easily obtained.

It is desirable that 75 to 90% by mass of the fibers constituting the toilet paper according to the present embodiment are pulp derived from hardwood. Hardwood-derived pulp has a short fiber length and tends to improve the texture of the paper surface. 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, it is desirable that the toilet paper according to the present invention contains a dry paper strength agent. By including the dry paper strength agent, the dry tensile strength of the base paper is increased, and the above-mentioned embossing depth can be easily adjusted. Further, it is desirable to include a transient wetting paper strength agent together with the dry paper strength agent. The texture will be better than that of dry paper strength agent alone. As a specific dry tensile strength, it is desirable that the dry tensile strength in the vertical direction is 500 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. With such a high dry tensile strength, the embossing depth is likely to be obtained, and the amount of water absorption is also extremely excellent. Specifically, the water absorption amount can be as high as 0.7 to 1.0 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 can have such a high water absorption by setting the dry tensile strength in the vertical direction to 500 to 800 cN / 25 mm. can. This amount of water absorption is an amount that the test paper can retain 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 ° C. ± 1 ° C. and a humidity of 50% ± 2% for 4 hours or more. Stack 10 sets of samples in the form of products and place them on the sample table to 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. When the dripping of water can be confirmed on the lower surface side opposite to the dripping surface of the sample, the dripping is stopped, and the amount of the dropped water is confirmed from the scale of the burette and used as the water absorption amount.

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 lateral 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 direction and the horizontal direction, and measurements are made 5 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 45 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 15 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. In the case of multiple plies, the toilet paper 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 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 water, 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 direction and the horizontal direction, and measurements are made 5 times each, and the average of the measured values is taken as the wet tensile strength in each direction.

It is desirable to add 0.005 to 0.15 mass of the dry paper strength agent to the raw material pulp. The type of dry paper strength 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.

It is desirable to add 0.01 to 0.03% by mass of the transient wetting paper strength agent to the raw material pulp. Transient wetting paper strength agents are not necessarily limited, but are limited to polyamide polyamine epichlorohydrin resin, urea resin, acid colloid / melamine resin, heat-crosslinkable coating PAM, TS-20 manufactured by Seikou PMC Co., Ltd., glioxylated polyacrylamide. , 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.

Further, the toilet paper according to the present invention preferably contains polyethylene oxide. The texture of the surface is improved, 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 may be appropriately added.

On the other hand, the toilet paper according to the present invention preferably 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 can be easily improved, and the bulkiness due to the unevenness of the embossing can be easily felt. To measure the thickness of toilet paper, the test piece is sufficiently humidity-controlled 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 the "PEACOCKH type" (manufactured by Ozaki Seisakusho), the measurement is performed with the multiple plies as they are. Specifically, after confirming 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 a stretch 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) is within the range of the measuring table. If there are recesses with different depths, the deepest recess 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 the 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 preferably has a water solubility of 40 seconds or less, 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 to loosen) is measured according to JIS P 4501 (1993). In 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 the number of revolutions recovers to 540 revolutions, 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.

On the other hand, the toilet paper according to the present invention can be produced in the process of producing a toilet roll, which is a product form of the toilet paper shown in FIG.

As shown in FIG. 4, the method for manufacturing the toilet roll includes a paper tube forming step (A) for manufacturing a long paper tube 30, and a log 75 by winding the toilet paper 7A around the long paper tube 30. It has a log forming step (B) to be manufactured and a log cutting step (C) in which the log 75 is cut in the width direction by a log cutter 91 into individual toilet rolls 1.

As shown in FIG. 4A, the paper tube forming step is one of the two strip-shaped paper tube base papers 31 and 32 unwound from the paper tube raw fabric rolls 31A and 32A. Adhesive glue 44 is applied to the direction by a gluing roll 51, and the other paper tube base paper 32 is partially overlapped on the glued surface of one paper tube base paper 31 in the width direction to form a glued surface of the other paper tube base paper 32. With the non-contact surface facing the mandrel shaft 52, the paper tube base papers 31 and 32 are spirally wound around the mandrel shaft 52 to continuously form a tubular portion 3, and the tubular portion 3 is used as a toilet roll 10. A long spiral paper tube 30 (also referred to as a spiral type paper tube) is formed by cutting with a cutter 58 with a width of a plurality of times or more the width of the above. This spiral paper tube has a two-layer laminated structure in which one paper tube base paper 31 is on the outer surface side of the paper tube and the other paper tube base paper 32 is on the inner surface side of the paper tube. In the present embodiment, two sheets of paper tube base papers 31 and 32 are spirally wound, but one or three or more sheets of paper tube base paper may be spirally wound to form a long paper tube. .. Further, in the toilet roll 10 according to the present invention, a flat-rolled paper tube may be adopted instead of the spiral paper tube.

After forming the long paper tube 30, the long paper tube 30 is supplied to the conveyor 55 and continuously or intermittently supplied to the winder X2 in the log forming step (B) by an appropriate transfer path.

In the log forming step ((B) in FIG. 4), the long paper tube 30 manufactured in the paper tube forming step (A) is set in the winding portion 85 of the winder X2, and the long paper tube 30 is used for toilet paper. Wrap 10 to make a log. The log 75 is an intermediate product having the same diameter as the final product, the toilet roll 1, and having a width of a plurality of times the width of the final product.

In the present embodiment, a pair of raw fabric rolls 70A and 70B are set on the winder X2, toilet paper base papers 71A and 71B are fed out from the raw fabric rolls 70A and 70B, respectively, and the toilet paper base papers 71A and 71B are laminated and integrated. Toilet paper 7A, which is double-layered, is continuously formed, and the toilet paper 7A is wound around a long paper tube 30 to manufacture a log 75. That is, the method for manufacturing the toilet paper 10 according to the present invention is incorporated in the log manufacturing process. It should be noted that this illustrated form is a form for producing 2-ply toilet paper, and the number of plies can be increased by increasing the number of raw fabric rolls. The formation of the plurality of stacked toilet papers 10 of the embodiment includes an embossing step. Each toilet paper base paper 71A, 71B receives the metal embossing rolls 21A, 22A and the embossing rolls 21A, 22A having a large number of embossed convex portions corresponding to the embossed shape and the embossed pattern formed on the surface. The surface of the toilet paper base papers 71A and 71B is embossed through the receiving rolls 21B and 22B whose surface is an elastic material, and after the embossing, the toilet paper base papers 71A and 71B are embossed rolls 21A and 22A. It is transported downstream while being wrapped around the peripheral surface of the. At this time, the toilet paper base papers 71A and 71B on the peripheral surface of the embossed roll are deformed into the surface shape of the embossed rolls 21A and 22A, and are conveyed downstream so as to cover the embossed rolls 21A and 22A.

On the other hand, the method for producing the toilet paper 10 according to the present embodiment includes an adhesive applying step, and the toilet paper base papers 71A and 71B are located on the peripheral surfaces of the embossed rolls 21A and 22A and are transported downstream. On the other hand, an adhesive is applied. The adhesive can be applied by a roll transfer device in which transfer rolls 14r and 14r are arranged so as to face at least one of the peripheral surfaces of the embossed rolls 21A and 22A. When latex is applied by the roll transfer device 14, the surface shape of the embossed rolls 21A and 22A is deformed by adjusting the distance between the transfer rolls 14r and 14r and the peripheral surfaces of the embossed rolls 21A and 22A. The adhesive can be applied only to the portion of the toilet paper base papers 71A and 71B in close contact with the embossed rolls 21A and 22A, which are located at the top of the convex portion of the embossed rolls 21A and 22A.

On the other hand, in the method for producing the toilet paper 10 according to the present embodiment, the adhesive-applied toilet paper base papers 71A and 71B are peeled off from the embossed rolls 21A and 22A, and the latex-applied surfaces are overlapped with each other facing each other. match. In the illustrated form, the toilet paper base paper 71B separated from one embossing roll 22A is guided to the marriage roll 23 arranged adjacent to the other embossing roll 21A so as to be overlapped on the marriage roll 23. However, the overlay is not limited to the illustrated form, and the embossed rolls 21A and 22A are arranged close to each other so that their peripheral surfaces face each other, and each toilet paper is placed at a position where the peripheral surfaces of the embossed rolls 21A and 22A face each other. The adhesive-applied surfaces of the base papers 71A and 71B may be brought together and overlapped.

In the illustrated form, the embossed rolls 21A and 22A are used to give unevenness to the toilet paper base papers 71A and 71B by embossing, but in the present invention, only one of the toilet paper base papers 71A is embossed. The unevenness due to processing may be imparted. The above embossing form is embossing in which it is a double embossing form, but although not shown, in the present embodiment, each toilet paper base paper is fed out from a plurality of raw fabric rolls at an appropriate speed, and each toilet paper base paper is fed out. The embossed roll is made of metal and the surface is formed with a large number of embossed convex portions corresponding to the embossed shape and the embossed pattern. The laminated toilet paper base paper may be embossed to give unevenness. In this case, it is in the form of so-called single embossing.

On the other hand, in the method for manufacturing the toilet paper 10 according to the present embodiment, after the embossing process, pattern printing is performed in which ink is applied to the surface of the toilet paper base paper in which the recesses are formed. The pattern printing can be performed by an appropriate printing machine 25, for example, a gravure printing device, a flexographic printing device, or the like. When the recesses are formed on both sides in the double embossing, the pattern printing may be provided on only one side.

After pattern printing, perforations are appropriately formed with a perforation device 82 or the like, and then the product is wound around a long paper tube 30 as described above to have the same diameter as the final product, the toilet roll 1. It forms a log 75, which is an intermediate product having a width of more than a plurality of times the width of the final product.

Then, after the log 75 is formed, as shown in FIG. 4C, in the log cutting step, the log cutter 91 cuts the log 75 into the width of each toilet roll 1 to obtain the toilet roll 1.

Here, in the toilet paper 10 according to the present invention, the basis weight of one sheet of toilet paper base paper is 16.0 to 18.0 g / m ² , and the dry tensile strength in the vertical direction is 550 to 800 cN / 25 mm. It is desirable to make it. Further, it is desirable that the paper thickness after embossing is 200 to 300 μm. Under such base paper and embossing conditions, the embossing depth of the concave portion of the ink-applied portion according to the present invention is shallower than the embossing depth of the concave portion of the non-ink-applied portion, and the ink is applied. The embossing depth of the concave portion of the applied portion is 0.1 mm to 0.17 mm, the embossing depth of the concave portion of the non-inked portion is 0.18 mm to 0.24 mm, and the ink is applied. It is easy to use toilet paper in which the difference between the embossing depth of the concave portion of the portion where the ink is not applied and the embossing depth of the concave portion of the portion where the ink is not applied is 0.05 mm to 0.1 mm.

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

Next, the "appearance" and "water absorption" of the examples and comparative examples of the toilet paper of the present invention were measured. The "appearance" was a sensory evaluation test of 10 subjects. In addition, for "appearance", it was visually confirmed whether or not there was blurring of printing, discoloration, etc. of the concave portion in the pattern printing portion. 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, as the toilet paper according to each example, a toilet roll was manufactured and pulled out from the toilet roll. The toilet paper has double-sided recesses by double embossing. Further, Example 1 is as shown in FIG. 1, and Comparative Example 2 is as shown in FIG. The physical characteristics and composition of each example are shown in Table 1 below.

In Example 1, ink was applied by printing after embossing to form a pattern, and in Comparative Example 1 and Comparative Example 2, ink was applied by printing and then embossing was performed.

First, comparing FIG. 1 according to Example 1 according to the present invention with FIG. 5 according to Comparative Example 2, in Comparative Example 2, the ink was peeled off in the shape of a recess due to embossing on the ink-applied portion. Many such parts can be confirmed. On the other hand, in Example 1, the portion where the ink is rubbed or peeled off can not be clearly confirmed in the shape of the concave portion, and the paper density, the paper thickness, the drying strength, the wet strength, and the water absorption amount are about the same, but in terms of appearance. Example 1 is clearly superior. Further, in comparison with Comparative Example 1, the sensory evaluation of the appearance is high and the design is not deteriorated, but the water absorption amount is significantly inferior.

As described above, in the toilet paper having the embossing and the pattern by printing according to the present invention, the effect of the embossing such as the bulkiness of the paper is not reduced, and the unevenness due to the embossing may reduce the design of the printed portion. Not only does it look good, but it also has very high water absorption.

1 ... Toilet roll, 10 ... Toilet paper, 11 ... Pattern by applying ink, 12 ... Recess by embossing, 20 ... Paper tube (tube core), L1 ... Toilet roll width, L2 ... Toilet roll winding diameter (diameter) , L3 ... Toilet roll core diameter, 30 ... Long paper tube, 75 ... Log, 31A, 32A ... Paper tube original roll, 31, 32 ... Paper tube base paper, 51 ... Gluing roll, 44 ... Adhesive glue , 52 ... Mandrel shaft, 3 ... Cylindrical part, 58 ... Cutter, 55 ... Conveyor, X2 ... Winder, 85 ... Winding part, 71A, 71B ... Toilet paper base paper, 70A, 70B ... Original roll, 21A, 22A ... Embossed roll, 22B, 22B ... Receiving roll, 14r ... Transfer roll, 14 ... Roll transfer device, 23 ... Marriage roll, 25 ... Pattern printing device, 7A ... Double-layered toilet paper base paper, 82 ... Perforated line-of-sight forming device, 91 ... Log Cutter, X3 ... Log accumulator.

Claims (6)

Toilet paper that has irregularities due to embossing and patterns due to the application of ink, and irregularities due to embossing are formed inside and outside the range to which the ink is applied.
The embossing depth of the recesses in the inked portion is shallower than the embossing depth in the recesses in the non-inked portion, and
The embossing depth of the concave portion of the ink-applied portion is 0.1 to 0.17 mm.
The embossing depth of the concave portion of the portion to which the ink is not applied is 0.18 to 0.24 mm.
A toilet paper characterized in that the difference between the embossing depth of the concave portion of the portion to which the ink is applied and the embossing depth of the concave portion of the portion to which the ink is not applied is 0.05 to 0.1 mm. The first aspect of the present invention, wherein the basis weight per ply is 15.8 to 17.8 g / m ² , the paper thickness is 200 to 300 μm, and the dry tensile strength in the vertical direction is 550 to 780 cN / 25 mm. Toilet paper. Embossing that gives unevenness to the paper surface by passing it between an embossed roll with many convex parts arranged on the surface and a receiving roll paired with this embossed roll in a state where multiple strip-shaped toilet paper base papers are laminated. A method for producing toilet paper, which comprises a printing process in which a pattern is printed by printing on a surface of the embossed toilet paper base paper after the processing step is performed. A single-layer strip-shaped toilet paper base paper or a stack of multiple strip-shaped toilet paper base papers is passed between an embossed roll having a large number of protrusions on the surface and a receiving roll paired with the embossed roll. The embossing process that gives unevenness to the paper surface and
Although a single-layer strip-shaped toilet paper base paper or a plurality of strip-shaped toilet paper base papers having irregularities imparted by the embossing process are laminated, another single-layer strip-shaped toilet paper base paper or a plurality of strip-shaped toilet paper base papers are laminated with respect to the convex portion forming surface. Stacking process of stacking strip-shaped toilet paper base paper,
A method for producing toilet paper, which comprises a printing step of printing a pattern on a surface of a laminated toilet paper base paper that has undergone this laminating step and in which recesses are formed. The basis weight of one sheet of toilet paper base paper is 16.0 to 18.0 g / m ² , the paper thickness after embossing is 200 to 300 μm, and the dry tensile strength in the vertical direction is 550 to 780 cN / 25 mm. The method for producing toilet paper according to claim 3 or 4. By adjusting the embossing pressure in the embossing process and the elongation of the paper surface due to the applied ink, the embossing depth of the concave portion of the ink-applied portion is 0.1 to 0.17 mm, and the embossing depth of the non-ink-applied portion is set to 0.1 to 0.17 mm. Adjust the embossing depth of the recesses to 0.18 to 0.24 mm, and adjust the difference between the embossing depth of the recesses in the inked part and the embossing depth of the recesses in the non-inked part to 0.05 to 0.1 mm. The method for manufacturing toilet paper according to any one of claims 3 to 5.

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