JP2019063172A - Sanitary tissue paper - Google Patents

Abstract

To provide a sanitary tissue paper that is excellent in absorptivity and wiping property.SOLUTION: A sanitary tissue paper includes a sheet laminate in which multiple sheets overlap on one another and which is subject to embossment processing. An embossment projection part is formed at a surface of the sheet laminate, where the embossment projection part has a height of 1.2 to 1.8 mm and an area rate of an apex of the embossment projection part is 0.35 to 2.0%.SELECTED DRAWING: Figure 3

Description

  The present invention relates to hygienic tissue paper.

  Hygienic tissue papers such as wipers are used for wiping dirt, oil, water and the like. Such hygienic tissue paper is required to have the ability (wipeability) to be able to wipe the dirt of the details. On the other hand, the performance (absorptivity) etc. which absorb quickly dirt, such as moisture which wiped off, and hold the absorbed moisture etc. are called for.

  For example, Japanese Patent Application Laid-Open No. 2015-195846 (Patent Document 1) discloses a paper wiper in which a plurality of sheets are stacked and integrated by embossing.

JP, 2015-195846, A

  However, conventional hygienic tissue paper which has been subjected to embossing can not sufficiently obtain the absorbability of oil and the like, and can not sufficiently obtain the wipe of the dirt and the like.

  An object of the present invention is to provide a sanitary thin paper excellent in absorbability and wipeability.

  In order to solve the above-mentioned subject, the 1st mode concerning the present invention is a hygienic tissue paper which embossing was given to a sheet layered product which laminates a plurality of sheets, and is embossed on the surface of the above-mentioned sheet layered product. A sanitary thin paper, wherein a convex portion is formed, the height of the embossed convex portion is 1.2 to 1.8 mm, and the area ratio of the top of the embossed convex portion is 0.35 to 2.0%. provide. Here, the area ratio of the top of the embossed protrusion is the ratio of the area of the top of the embossed protrusion to the area of the sheet laminate.

  In the first aspect, the height of the embossed convex portion formed on the surface of the sheet laminate is 1.2 to 1.8 mm, and the area ratio of the top of the embossed convex portion is 0.35 to 2.0%. Thereby, the density of the embossed projections can be increased relative to the sheet laminate. When the density of the embossed convex portion is increased, the absorption rate of oil and water is increased. Therefore, in the first aspect, by forming such an embossed convex portion on the surface of the sheet laminate, it is possible to improve the absorbability of oil and the like.

  In the first aspect, the density of the embossed projections is high, whereby the hygiene tissue can be easily compressed and the hygiene tissue becomes soft. With such a hygienic tissue paper having such flexibility, when the dirt and the like are wiped off, the dirt and the like easily adhere to the hygiene tissue sheet, so the dirt and the like are easily dropped. In addition, when the density of the embossed convex portion is high, the unevenness formed on the surface of the hygienic tissue paper is increased, which makes it easy to scrape dirt and the like. Therefore, in the first aspect, the high density of the embossed convex portions as described above can improve the wiping property such as dirt.

  Furthermore, in the first aspect, the tensile strength of the sanitary thin paper can be increased by setting the area ratio of the height and the top of the embossed convex portion formed on the surface of the sheet laminate to the above-mentioned range. In addition, when the density of the embossed projections becomes high, the bonding strength between the sheets constituting the sheet laminate becomes strong, and the peeling between the sheets can be suppressed. Therefore, in the first aspect, the fastness of the sanitary thin paper can be improved.

  In the first aspect, by setting the height of the embossed convex portion and the area ratio of the top to the above-mentioned range, it is possible to improve the absorbability and the wiping property without increasing the basis weight and the bulk of the sanitary thin paper. . Therefore, in the first aspect, it is possible to avoid an increase in product cost associated with an increase in basis weight and the like of the sanitary thin paper.

A second aspect provides a sanitary tissue paper, wherein the density of the embossed projections is 55,000 to 180,000 pcs / m ² . In the second aspect, by setting the density of the embossed projections to 55000 to 180000 / m ² with respect to the sheet laminate, it is possible to reliably obtain a sanitary thin paper having high absorbability and wipeability.

  According to a third aspect of the present invention, the side surface of the embossed convex portion is from the bottom of the embossed convex portion to the top of the embossed convex portion, and the area of the top of the embossed convex portion corresponds to the embossed convex portion Provided is a sanitary tissue, which is inclined to be smaller than the area of the opening.

  In the third aspect, the side surface of the emboss convex portion is inclined such that the area of the top of the emboss convex portion is smaller than the area of the opening of the emboss concave portion, and from the bottom of the emboss convex portion to the top of the emboss convex portion It is possible to form an emboss projection that tapers towards the bottom. The structure in which the emboss convex portion is tapered is a structure in which dirt and the like are easily scraped off. Therefore, in the third aspect, by forming such an embossed convex portion, it is possible to surely improve the wiping property such as dirt.

A fourth aspect provides a sanitary thin paper, wherein the basis weight of each sheet is 15 to 25 g / m ² , and the thickness of each sheet is 100 to 200 μm. In the fourth aspect, by including the basis weight and the thickness of each sheet constituting the sheet laminate in such a range, a sanitary thin paper having high absorbability and wipeability can be reliably obtained. In addition, when the basis weight and thickness of each sheet are too low, the strength of the sanitary thin paper may decrease, and when it is too high, the product cost may increase.

The fifth aspect provides a sanitary thin paper having a compression energy of 4.0 gf · cm / cm ² or more. Here, the compression energy is an integral value of the amount of work of compression when compressed to the upper limit load. The large compression energy indicates that the hygienic tissue paper is high in strength and strong (robust) hygienic tissue paper. Also, the large compression energy indicates that the sanitary tissue is easy to compress and soft.

In the fifth aspect, by setting the compression energy of the hygienic tissue paper to 4.0 gf · cm / cm ² or more, the tensile strength of the hygienic tissue paper can be increased, and a highly robust hygienic tissue paper can be reliably obtained. it can. In addition, hygienic tissue paper having compression energy in such a range tends to be compressed, so that soft (flexible) hygienic tissue paper can be reliably obtained.

  A sixth aspect provides a hygienic tissue paper, wherein the embossed projections are formed by pin embossing. Here, the pin embossing process is an embossing process that forms fine embossed recesses or embossed protrusions (concave and convex) that integrates a plurality of sheets. In the pin embossing, the angle between the surface on which the bottom of the embossed protrusion is formed, the side of the embossed protrusion from the bottom to the top of the embossed protrusion, and the surface on which the bottom of the embossed protrusion is formed is about 50 to 50 Embossed at 80 °.

  In the sixth aspect, by forming the embossed projections by such pin embossing, it is easy to form the embossed projections on the sheet laminate. Further, by forming the embossed convex portions by such pin embossing, the respective sheets are joined via the unevenness due to the pin embossing, so that the respective sheets of the sheet laminate are joined without using an adhesive. be able to.

  Further, in the pin embossing process, since the embossed depressions or the embossed projections formed on the sheet are fine, the sheet laminate can be embossed while securing the space between the sheets. Therefore, in the sixth aspect, the absorbed oil and the like are held between the sheets and can be moved between the sheets, so that the absorbability of the oil and the like can be improved.

  A seventh aspect provides a hygienic tissue paper wherein no holes are formed in the top layer of the sheet laminate. In the seventh aspect, since holes are not formed in the uppermost layer of the sheet laminate having the embossed projections formed on the surface by pin embossing, the front and back of the sanitary thin paper are penetrated through the tops of the embossed projections. Not. This makes it possible to prevent the oil and the like wiped off on one side of the sanitary thin paper from passing through to the other side of the sanitary thin paper.

  Moreover, when the pinning process is applied to the sanitary thin paper in which the hole is not formed in the top layer of the sheet laminate, the pins used in the pin embossing process are not penetrated to the top layer of the sheet stack. Therefore, in the seventh aspect, scattering of paper dust can be prevented at the time of pin embossing.

  According to one aspect of the present invention, it is possible to provide a hygienic tissue paper which is excellent in absorbability and wipeability.

It is a figure which shows the plane of the sanitary thin paper concerning this embodiment. It is a figure which shows the laminated structure of the sheet | seat laminated body which comprises the sanitary tissue paper of FIG. It is the figure which expanded a part (P1 part) of FIG. It is the figure which expanded a part (P2 part) of FIG. It is the figure which looked at FIG. 4 in the A direction. It is the figure which looked at FIG. 4 in the B direction. It is a figure which shows the laminated structure of the sheet | seat laminated body which comprises the conventional sanitary thin paper. It is the figure which expanded a part (P2 part) of FIG. It is the figure which looked at FIG. 8 in the A direction. It is the figure which looked at FIG. 8 in the B direction. It is the photograph which image | photographed the state of the ink coated surface when the ink coated surface of the stainless plate which apply | coated the ink was wiped off using the sanitary thin paper of this embodiment (Examples 1-3). It is the photograph which image | photographed the state of the ink application | coating surface when the ink application | coating surface of the stainless plate which apply | coated the ink was wiped off using the hygiene thin paper of Comparative Examples 1 and 2.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, unless otherwise specified, the same or corresponding components may be denoted by the same reference symbols and description thereof may be omitted.

  FIG. 1 is a plan view of a sanitary thin paper according to the present embodiment, and FIG. 2 is a view showing a laminated structure of sheet laminates constituting the sanitary thin paper of FIG. 3 is an enlarged view of a part (P1 portion) of FIG. 1, and FIG. 4 is an enlarged view of a part (P2 portion) of FIG. Furthermore, FIG. 5 is a view of FIG. 4 in the A direction, and FIG. 6 is a view of FIG. 4 in the B direction.

  In FIG. 1, the wiper 10 is an industrial wiper and is an example of a sanitary thin paper according to the present invention. The hygiene tissue paper of the present embodiment is not limited to the wiper, and includes hygiene tissue paper such as tissue paper, kitchen paper and kitchen towel. In addition, applications of sanitary thin paper can be targeted for both household and business use.

  The wiper 10 is obtained by embossing the crepe laminate 20 (see FIG. 3). In addition, the crepe laminate 20 is one in which four crepe papers 11 to 14 are stacked and integrated (see FIGS. 1 to 3). The crepe papers 11 to 14 are an example of a plurality of sheets in the present invention, and the crepe laminate 20 is an example of a sheet laminate in the present invention.

  For the crepe papers 11 to 14 constituting the crepe laminate 20, known crepe papers on which a crepe is formed can be used. The crepe paper is a paper in which fine wrinkles are formed on the surface by applying a blade called a doctor blade at the outlet of a paper machine drier in a sheet making process of a sheet. The number of crepe papers constituting the crepe laminate 20 is not particularly limited as long as it is two or more, but from the viewpoint of handleability at the time of manufacture or use of the wiper 10, the number of crepe papers is five or less. preferable.

  For the crepe papers 11 to 14, a base paper composed mainly of pulp is used. The composition of the pulp can be a known composition depending on the type of sanitary paper. The pulp composition is, for example, an appropriate ratio of softwood pulp such as NBKP (softwood kraft pulp) and NUKP (softwood unbleached pulp) and hardwood pulp such as LBKP (hardwood kraft pulp) and LUKP (hardwood unbleached pulp). The composition can be made.

  Moreover, it is preferable to set it as the pulp composition with many ratios of softwood pulp with respect to hardwood pulp. The ratio of softwood pulp to hardwood pulp can be, for example, 50:50 to 100: 0. More preferably, the proportion of softwood pulp is 70% or more. In addition, as the type of pulp, used paper pulp obtained by reproducing magazines and newspaper waste paper may be used, and in this case, the ratio of used paper pulp can be 10 to 100%.

  In the wiper 10, the crepe laminate 20 is embossed. The type of embossing is not particularly limited as long as irregularities are formed on the surface of the crepe laminate 20. Moreover, a hole may be formed in the crepe laminate 20 by embossing. Furthermore, while forming holes in the crepe laminate 20 by embossing, the crepe papers 11 to 14 constituting the crepe laminate 20 may be joined.

  Embossing 30 is formed in crepe layered product 20 by such embossing (refer to Drawing 3). The emboss 30 is composed of a concave emboss 31 and a convex emboss 32 corresponding to the concave emboss 31. And multiple concave embossing 31 and convex embossing 32 are formed in the front and back of the crepe laminated body 20 (refer FIGS. 3-6). In addition, the convex embossings 32 all have substantially the same height. In addition, the convex embossing 32 of the embossing 30 is an example of the embossing convex part formed in the surface of a sheet laminated body in this invention.

  The concave embossing 31 and the convex embossing 32 of the embossing 30 are formed by a known embossing method such as pin embossing. Specifically, a plurality of metal pins (not shown) are penetrated from crepe paper 11 to crepe paper 13 (or crepe paper 14 to crepe paper 12) so as not to penetrate crepe paper 14 (or crepe paper 11) And crepe paper 11 to 14 are subjected to pin embossing.

  In such a configuration, no hole is formed in the top layer (crepe paper 14) of the crepe laminate 20. That is, the front and back of the wiper 10 does not penetrate through the top 33 of the convex emboss 32. Therefore, for example, it is possible to suppress that the oil component and the like wiped off on the surface of the wiper 10 slip through on the back surface of the wiper 10.

  In addition, although pin embossing may penetrate crepe paper 11-13 as mentioned above, you may penetrate from crepe paper 14 to crepe paper 12, and you may be performed so that crepe paper 11 may not be penetrated. In addition, by not allowing the embossing pins to penetrate all of the crepe papers 11 to 14, it is possible to prevent the scattering of paper dust at the time of pin embossing.

  In this embodiment, crepe paper 11-14 is joined via emboss 30 simultaneously with formation of emboss 30 by such pin embossing processing, and crepe laminate 20 in which crepe paper 11-14 is integrated is constituted. . Then, the concave emboss 31 is formed on one surface of the crepe laminate 20, and the convex emboss 32 is formed on the other surface of the crepe laminate 20 corresponding to the concave emboss 31 (see FIGS. 1 to 6). ).

  That crepe papers 11 to 14 are joined means that the convex portions formed on crepe papers 11 to 13 are formed on crepe papers 12 to 14 on the upper layer by pin embossing, through convex emboss 32 on the concave portions formed on crepe papers 12 to 14. It is to be fitted in the pressure-welded state. As described above, the crepe papers 11 to 13 penetrate through the convex embossments 32, but the crepe paper 14 does not penetrate.

  In the crepe laminate 20 of the present embodiment, the crepe laminate 20 in which the crepe papers 11 to 14 are laminated in a state where the emboss is not formed on the respective crepe papers 11 to 14 is embossed. It is not limited to embossing. For example, before laminating each crepe paper, embossing may be formed on each crepe paper in advance, and these crepe papers on which the embossing is formed may be laminated. In addition, since it is not necessary to emboss every crepe paper 11-14 before being laminated | stacked if the crepe laminated body 20 of this embodiment is used, manufacture of the wiper 10 is easy.

  In the present embodiment, the emboss 30 formed on the crepe laminate 20 are arranged at a predetermined interval, but the arrangement interval of the projections of the emboss 30 is not particularly limited. In the present embodiment, as shown in FIG. 4, the arrangement interval of the projections of the emboss 30 when viewed in the A direction of FIG. 4 is D1 (1.75 mm): D2 (3.5 mm) = 1: 2. ing. In addition, the arrangement interval of the emboss 30 when viewed in the B direction (the direction rotated 55 ° with respect to the A direction) in FIG. 4 is D3 (2.5 mm): D4 (5 mm) = 1: 2. .

  In the present embodiment, the height H1 of the convex emboss 32 of the emboss 30 formed on the crepe laminate 20 can be 1.2 mm to 1.8 mm, preferably 1.3 to 1.7 mm, more preferably Make it 1.4 to 1.6 mm. The height H1 of the convex emboss 32 is the distance between the top 33 of the convex emboss 32 and the bottom (opening of the concave emboss 31) 35 of the convex emboss 32.

  Furthermore, in the present embodiment, the area ratio of the top 33 of the convex emboss 32 of the emboss 30 formed on the crepe laminate 20 can be 0.35 to 2.0%, preferably 0.4 to 1.%. It is preferably 8%, more preferably 0.5 to 1.6%. Here, the area ratio of the top 33 of the convex embossing 32 is the ratio of the area of the top 33 of the convex embossing 32 to the area of the crepe laminate 20.

  In the present embodiment, the height H1 of the convex embossing 32 formed on the surface of the crepe laminate 20 is 1.2 to 1.8 mm, and the area ratio of the top 33 of the convex embossing 32 is 0.35 to 2.0%. By doing this, the density of the convex embossments 32 becomes higher than that of the crepe laminate 20. The wiper 10 can increase the absorption speed of oil, water, and the like when the density of the convex embossing 32 becomes high. Therefore, in this embodiment, the absorbency of oil etc. can be improved in wiper 10 by forming convex emboss 32 with high density on the surface of crepe laminate 20.

  Further, in the present embodiment, as the density of the convex embossments 32 becomes higher than that of the crepe laminate 20, the wiper 10 is easily compressed, and the wiper 10 becomes soft. In the wiper 10 having such flexibility, when the dirt or the like is wiped off, the dirt or the like easily adheres to the wiper 10, so the dirt or the like is easily dropped. In addition, when the density of the convex and concave portions 32 is increased as described above, the unevenness formed on the surface of the wiper 10 is increased, and thus dirt and the like are easily scraped off. Therefore, in the present embodiment, since the density of the embossed convex portion is higher than that of the crepe laminate 20, the wiping property such as dirt can be improved.

  Furthermore, in the present embodiment, the tensile strength of the wiper 10 is increased by setting the height of the convex emboss 32 formed on the surface of the crepe laminate 20 and the area ratio of the top 33 of the convex emboss 32 to the above-mentioned range. be able to. Moreover, when the density of the convex embossing 32 becomes high, the bonding strength between the crepe papers 11-14 which comprise the crepe laminated body 20 becomes strong, and can suppress peeling between the crepe papers 11-14. Therefore, in the present embodiment, the wiper 10 having excellent (or strong) durability can be obtained.

  Further, in the present embodiment, by setting the height of the convex emboss 32 and the area ratio of the top 33 of the convex emboss to the above-mentioned range, the absorbability and the wiping property are improved without increasing the basis weight and bulk of the wiper 10. be able to. Therefore, in the present embodiment, it is possible to avoid an increase in product cost due to an increase in the basis weight and the like of the wiper 10.

Although the range of the density of the convex embossing 32 with respect to the crepe laminate 20 is arbitrary, in the present embodiment, the convex embossing 32 is the crepe laminate 20 so that the density of the convex embossing 32 is 55000 to 180000 pcs / m ^2. Is formed. By setting the density of the convex embossing 32 to 55,000 to 180,000 pcs / m ² , the wiper 10 having excellent absorbability and wipeability can be reliably obtained. In addition, the density of the embossed convex portion is preferably 5600 to 150000 particles / m ² , more preferably 58000 to 130000 particles / m ² .

  In the present embodiment, as shown in FIGS. 4 to 6, the side surface 34 of the convex embossing 32 is inclined. Specifically, in the wiper 10, the area of the top 33 of the convex emboss 32 is from the bottom 35 (opening of the concave emboss 31) 35 to the top 33 (bottom of the concave emboss 31) of the convex emboss 32 It inclines so that it may become smaller than the area of the bottom 35 of convex embossing.

  That is, the convex emboss 32 is tapered (or tapered) from the bottom (opening of the concave emboss 31) 35 of the convex emboss 32 to the top (bottom of the concave emboss 31) 33 of the convex emboss 32. Since the structure in which the convex emboss 32 is tapered as described above is a structure in which dirt and the like are easily scraped off, the wiper 10 having such a convex emboss 32 is excellent in wiping properties such as dirt.

  Moreover, the top (bottom of concave emboss 31) 33 of convex emboss 32 and the bottom (opening of concave emboss 31) 35 of convex emboss 32 both have a square shape in plan view (FIG. 3, FIG. 4) reference). Further, the square shape of the top 33 of the convex embossing 32 and the square shape of the bottom 35 of the convex embossing 32 have a similar shape. Thereby, the shape of the convex embossing 32 has a truncated square pyramid. In addition, the shape of the convex embossing 32 is not limited to a truncated square pyramid, You may have shapes, such as a truncated triangular pyramid and a truncated cone.

The basis weight and thickness of each of the crepe papers 11 to 14 constituting the crepe laminate 20 are arbitrary. In this embodiment, the basis weight of each of the crepe papers 11 to 14 is 15 to 25 g / m ² , and the thickness is 100 to 200 μm. By setting the basis weight and thickness of each of the crepe papers 11 to 14 constituting the crepe laminate 20 in such a range, the wiper 10 having excellent absorbability and wipeability can be reliably obtained. If the basis weight and thickness of the crepe paper are too low, the strength of the sanitary thin paper may decrease, and if it is too high, the product cost may increase.

The physical properties of the wiper 10 are arbitrary, but in the present embodiment, the wiper 10 is formed so that the compression energy is 4.0 gf · cm / cm ² or more. In the present embodiment, by setting the compression energy of the wiper 10 to 4.0 gf · cm / cm ² or more, the tensile strength of the wiper 10 becomes high, and the wiper 10 excellent in the fastness can be surely obtained. Moreover, since the wiper 10 in which the compression energy is included in such a range tends to be compressed, according to the present embodiment, it is possible to make the wiper 10 flexible (provide flexibility).

  In the present embodiment, it is preferable that the convex embossing 32 be formed on the crepe laminate 20 by pin embossing. In the present embodiment, the convex embossing 32 can be easily formed on the crepe laminate 20 by forming the convex embossing 32 by such pin embossing. Further, since the crepe papers 11 to 14 are joined via the concavities and convexities by pin embossing, the crepe papers 11 to 14 constituting the crepe laminate 20 can be joined without using an adhesive.

  In addition, since the concave emboss 31 or the convex emboss 32 formed on the crepe paper 11 to 14 by pin embossing is fine, the convex emboss 32 is formed on the crepe laminate 20 while securing the space between the crepe papers 11 to 14 Can. Therefore, in the present embodiment, the absorbed oil and the like are held between the crepe papers 11 to 14, and the oil and the like can move between the crepe papers 11 to 14, so that the absorbability of the oil and the like can be improved. it can.

  Hereinafter, the present embodiment will be specifically described using examples. In addition, this embodiment is not limited to these Examples. The measurement and evaluation of each example and comparative example were performed as follows.

[Basic weight (base paper and basis weight)]
The basis weight (g / m ² ) of each crepe paper (base paper) and wiper (product) constituting the crepe laminate of the wiper was measured by a method according to JIS P 8124 (1998).

[Thickness (base paper and basis weight)]
The thickness (μm) of each crepe paper making up the crepe laminate of the wiper is a dial gauge (Pecock G type manufactured by Ozaki Seisakusho, after sufficiently conditioning each crepe paper under the conditions of JIS P 8111 (1998) ) Was used.

[Flexibility]
The flexibility of the wiper was evaluated from the compression energy. For measurement of compression energy, prepare a test piece cut into 12 cm x 12 cm (measured in the product state and measured as it is 4 ply if it is a 4-ply product), and use a compression tester (Kato Tech, KES-G5) The compressive energy WC (gf · cm / cm ² ) at a load of 300 gf / cm ² is measured using Measurement conditions: Pressurizer area: 2 cm ² , Force meter: 1 kg, CHECK switch: MES, DEF output sensitivity dial: 2 mm / V, Upper limit load: 300 gf / cm ² (SENS: 10, STOROKE SET dial: 6), SPEED : 0.02 cm / s (SPEED RANGE switch: 0.1, SPEED SET switch: 2), CONTROL switch: INT, STOP switch: OFF.

Robustness
The tensile strength (dry tensile strength and wet tensile strength) was measured as the fastness of the wiper. The dry tensile strength is a measured value [cN] measured in accordance with JIS P 8113 (2006), and the longitudinal direction (direction parallel to the orientation of the fiber) was measured. The wet tensile strength is a measured value (cN / 25 mm) measured in accordance with JIS P 8135, and the longitudinal direction (direction parallel to the orientation of the fiber) was measured. In addition, the sample in each tensile strength is the wiper cut | judged to about 150 mm length x 25 mm width in a product state (if it is 4 ply products, it is 4 plies).

Water absorption speed
Drop a 300 μL of water onto the wiper (product) with a micropipette, and from the moment the water droplet contacts the wiper, use a stopwatch to measure the time it takes for the water to be completely absorbed and the paper surface reflection to disappear. Measure in seconds. The test is conducted 5 times, and the average value is taken as the value obtained by the test procedure of recording to the first decimal place.

[Water absorption]
The water absorption of the wiper was measured. To measure the amount of water absorption, a test piece obtained by cutting a wiper (product) 100 mm × 100 mm is put in water, and when water penetrates into the test piece, the sample is pulled out from water and the weight of the test piece after 30 seconds is measured. The amount of water absorption is the amount of water absorbed by the wiper per area of the wiper (g / m ² ).

Oil absorption speed
200 μL of edible oil is dropped onto the wiper (product) with a micropipette, and from the moment the oil droplets contact the wiper, the time until the oil is completely absorbed and the reflection on the paper surface disappears, using a stopwatch. .01 Measured in units of seconds. The test is conducted 5 times, and the average value is taken as the value obtained by the test procedure of recording to the first decimal place.

[Oil absorption]
The oil absorption of the wiper was measured. To measure the oil absorption, a test piece with a wiper (product) cut 100 mm × 100 mm is placed in an edible oil, and when the oil penetrates the test piece, it is pulled out of the oil and the weight of the test piece after 30 seconds is measured. The oil absorption is the amount of oil absorbed by the wiper per area of the wiper (g / m ² ).

[Wipeability]
The wipeability of the wiper was confirmed. For confirmation of the wiping performance, a stainless steel (material: stainless steel) plate (dimension: 10 cm × 20 cm) is coated with an ink (Pentel, WFCT23) and defined in a constant temperature and humidity chamber (JIS P 8111 (1998), After leaving it for 15 hours at 23 ° C and 50% RH (Hybrid water), 500 μL of water is dropped, and the ink coated surface of the stainless when the ink is wiped with a wiper (product) is photographed. The condition was confirmed (see FIGS. 11 and 12). The evaluation of the wiping performance was performed based on the following criteria.
と て も Very well dropped ○ Well dropped わ ず か Slightly dropped × Almost never dropped.

[Peelability]
The peelability of the wiper was confirmed. The peelability was confirmed by holding the wiper (in the state of product) and shaking it 10 times to confirm peeling of the ply.

Evaluation of peelability was performed on the basis of the following.
○ Crepe paper was peeled off.
× The crepe paper did not peel off

  Hereinafter, Examples and Comparative Examples will be described.

Example 1
In Example 1, a wiper 10 was prepared in which pin embossing was applied to a crepe laminate 20 in which four sheets of base paper (crepe papers 11 to 14) having a basis weight of 19.2 g / m ² and a thickness of 170 μm were superimposed (FIG. 1 to 3)). The wiper 10 had a basis weight as a product of 76.8 g / m ² and a paper thickness of 450 μm. Further, as the emboss conditions, the emboss 30 formed on the crepe laminate 20 is such that the height (H1) 1.5 mm of the convex emboss 32 and the top 33 (bottom of the concave emboss 31) of the convex emboss 32 is quadrangular. The density of the convex emboss 32 was 120000 / m ² , and the area ratio of the top 33 of the convex emboss 32 was 0.75%. The results of the measurement and evaluation are shown in Table 1.

Example 2
In Example 2, the basis weight is 18.5 g / m ² and the thickness is 140 μm as the base paper, the density is 82500 pcs / m ^{2 of} the convex embossing 32 and the area ratio 0.52% of the top 33 of the convex embossing 32 is the embossing conditions. Example 7 was carried out in the same manner as Example 1 except that the basis weight was 73.8 g / m ² . The results of the measurement and evaluation are shown in Table 1.

[Example 3]
In Example 3, the basis weight is 18.5 g / m ² and the thickness is 140 μm as the base paper, the density is 60000 pcs / m ^{2 of} the convex embossing 32 and the area ratio of 1.5% of the top 33 of the convex embossing 32 is as embossing conditions. Example 7 was carried out in the same manner as Example 1 except that the basis weight was 73.8 g / m ² and the paper thickness was 478 μm. The results of the measurement and evaluation are shown in Table 1.

Comparative Example 1
In Comparative Example 1, as the emboss conditions, the height (H2) 2.4 mm of the convex emboss 32, the density 50750 pieces / m ^{2 of} the convex emboss 32, and the top of the convex emboss 32 were used as the emboss 30 formed on the crepe laminate 20. The same process as in Example 1 was performed except that the area ratio of 33 was set to 0.31%. The results of the measurement and evaluation are shown in Table 1.

Comparative Example 2
In Comparative Example 2, a commercially available wiper was prepared in which pin embossing was applied to a crepe laminate in which four sheets of base paper were superimposed. This wiper had a basis weight of 77 g / m ² and a paper thickness of 448 μm as a product. Further, as the embossing conditions, the shape of the top of the convex embossing (the bottom of the concave embossing) was a square, and the density of the convex embossing was 90,000 / m ² . The results of the measurement and evaluation are shown in Table 1.

From Table 1, the height of the convex embossing 32 formed on the surface of the crepe laminate 20 is 1.2 to 1.8 mm, and the area ratio of the top of the convex embossing 32 is 0.35 to 2.0%. The wiper 10 has a compression energy of 4.0 gf · cm / cm ² or more, a tensile strength of 2500 cN or more, a water absorption amount of 800 (g / m ² ) or more, a water absorption speed of 5 seconds or less, and an oil absorption amount of 800 (g / m) ² ) Above, the oil absorption speed was 15 seconds or less, the wipeability was ◎, and the removability was ((Examples 1 to 3).

On the other hand, the wiper 10 which does not satisfy the conditions of the height 1.2 to 1.8 mm of the convex embossing 32 and the area ratio 0.35 to 2.0% of the top of the convex embossing 32 has a compression energy of 4.0 gf・ Less than cm / cm ² , tensile strength is less than 2500 cN, water absorption is more than 800 (g / m ² ) but water absorption speed is more than 5 seconds, oil absorption is more than 800 (g / m ² ) but oil absorption speed is 15 seconds , The wiping property was Δ, and the peeling property was × (Comparative Examples 1 and 2).

  From these results, the height of the convex embossing 32 formed on the surface of the crepe laminate 20 is 1.2 to 1.8 mm, and the area ratio of the top of the convex embossing 32 is 0.35 to 2.0%. Some wipers 10 (Examples 1 to 3) were found to be excellent in absorbability and wiping performance. Moreover, it turned out that the wiper 10 of Examples 1-3 is excellent in a softness | flexibility and toughness.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to a specific embodiment, A various deformation | transformation and change are possible within the range of the invention described in the claim. .

10 Wiper 11-14 Crepe Paper 20 Crepe Laminate 30 Embossed 31 Concave Embossed 32 Convex Embossed 33 Top 34 Side 35 Bottom

Claims (7)

Hygienic tissue paper in which embossing is applied to a sheet laminate formed by stacking a plurality of sheets,
Embossed projections are formed on the surface of the sheet laminate,
The height of the embossed convex portion is 1.2 to 1.8 mm,
The sanitary thin paper, wherein the area ratio of the top of the embossed convex portion is 0.35 to 2.0%. The hygienic tissue paper according to claim 1, wherein the density of the embossed projections is 55,000 to 180,000 pieces / m ² .   The side surface of the embossed convex portion is directed from the bottom of the embossed convex portion to the top of the embossed convex portion, and the area of the top of the embossed convex portion is greater than the area of the opening of the embossed concave portion corresponding to the embossed convex portion 3. Hygienic tissue paper according to claim 1 or 2, which is inclined to become smaller. The basis weight of each sheet is 15 to 25 g / m ² ,
The hygienic tissue paper according to any one of claims 1 to 3, wherein the thickness of each sheet is 100 to 200 m. The hygienic tissue paper according to any one of claims 1 to 4, wherein the compression energy is 4.0 gf · cm / cm ² or more.   The hygienic tissue paper according to any one of claims 1 to 5, wherein the embossed projections are formed by pin embossing.   The hygienic tissue paper according to claim 6, wherein no holes are formed in the top layer of the sheet laminate.