JP7221666B2 - sanitary tissue paper - Google Patents

Description

The present invention relates to sanitary tissue paper.

Sanitary thin paper such as kitchen paper is sometimes used as a thin paper roll in which a sheet is wound in a roll. Perforations are formed in the roll sheet at predetermined intervals in the longitudinal direction. Such a thin paper roll is installed in a holder or the like, and a part of the cut sheet is used as a sanitary thin paper by cutting perforations formed on the sheet (for example, see Japanese Patent Application Laid-Open No. 2007-37595. ).

JP 2007-37595 A

However, with conventional sanitary thin paper, when part of the sheet is cut from a thin paper roll placed in a holder or the like, the sheet is not cut cleanly at the position where the perforations are formed, and the sheet is torn in an unexpected direction. Extra sheets may be pulled out. As described above, it may be difficult to cut the conventional sanitary thin paper.

An object of the present invention is to provide a sanitary tissue paper that can be easily cut.

A first aspect of the present invention is a sanitary thin paper having slits arranged at predetermined intervals in a longitudinal direction and extending in a width direction that intersects with the longitudinal direction, wherein the slits are arranged in at least one of the width directions. It has a first perforation formed near the end and a second perforation formed between the central portion in the width direction and the first perforation, and the tie cut ratio of the second perforation is smaller than the tie-cut ratio of the first perforation.

In this specification, at least one end in the width direction refers to a zone or section (hereinafter referred to as zone) near one end in which slits are formed among both ends in the width direction of the sanitary thin paper. Or show each zone towards both ends. That is, the first perforation is formed in a zone closer to one end and/or a zone closer to the other end in the width direction.

Further, the central portion indicates a zone including the widthwise center of the sanitary thin paper and its periphery. That is, a part of the slit excluding the first and second perforations is formed in the central portion.

In addition, the space between the center in the width direction and the first perforation is the zone between the zone in the center in the width direction where the slit is formed and the zone near one of the ends, and/or the width The zone between the zone in the middle of the direction and the zone towards either end is shown. That is, the second perforation is formed in the zone near one end and/or the zone other than the zone near the other end and the zone in the central part.

A perforation is a structure in which cut portions (hereinafter referred to as cut portions) and uncut portions (hereinafter referred to as tie portions) between two adjacent cut portions are alternately arranged. The tie-cut ratio is the ratio of the length of the tie portion to the length of the cut portion, in units of the cut portion and the tie portion that are adjacent in the direction in which the perforations extend. The smaller the tie-cut ratio, the higher the ratio of the length of the cut portion to the length of the tie portion, which makes the perforations easier to cut.

In the sanitary thin paper having slits extending in the width direction intersecting the longitudinal direction, the sanitary thin paper is cut from one end in the width direction toward the center in the width direction along each slit arranged in the longitudinal direction. be done. At this time, with conventional sanitary thin paper, the zone near the one end can be cut cleanly along the slit, but the zone between the one end and the center (the zone near the one end and the zone near the one end) Zones other than the central zone tend not to cut cleanly along the slit. Therefore, the sanitary thin paper tends to be torn in an unexpected direction, or excess sanitary thin paper tends to be pulled out without cutting the perforations.

On the other hand, in the first aspect, the first perforation with a large tie-cut ratio is formed in the zone near one end, and the zone between the one end and the center has a small tie-cut ratio. A second perforation is formed. Thereby, in the first aspect, even the zone between one end and the center can be cleanly cut along the slit.

In the first aspect, the cutting of the sanitary thin paper starts from at least one end in the width direction and progresses toward the center in the width direction, but the cutting direction is the first where the tie cut ratio is large. It gradually stabilizes as it progresses from the perforation to the second perforation with a smaller tie-cut ratio. Then, even if the progress of cutting reaches the central portion and further reaches the other end portion side in the width direction, the cutting can proceed while the cutting direction is stable.

As a result, in the first aspect, the sanitary thin paper is not fixed or is in an unstable state (for example, when part of the sanitary thin paper is cut from a thin paper roll rotatably installed in a holder or the like, the sanitary thin paper is not pressed down). ), a part of the sanitary thin paper can be cut off at the position where the perforations are formed. Therefore, in the first aspect, it is possible to prevent the sanitary thin paper from tearing in an unexpected direction when part of the sanitary thin paper is cut off. In addition, it is possible to prevent excess sanitary thin paper from being pulled out. Therefore, according to the first aspect, it is possible to provide a sanitary thin paper that can be easily cut.

A second aspect of the present invention provides sanitary thin paper, wherein the second perforation is formed at a position separated from the at least one end by 8.5% or more of the width dimension of the sanitary thin paper. . In this specification, the position at least 8.5% of the width dimension of the sanitary thin paper from the edge means that the width from the edge in the width direction toward the center when the width dimension of the sanitary thin paper is 100%. Zones excluding the center are shown separated in the direction by at least 8.5% of the width dimension of the sanitary tissue paper.

In the conventional sanitary thin paper, when the sanitary thin paper is cut, among the zones between the edges in the width direction and the central part, the zone that is 8.5% or more of the width dimension of the sanitary thin paper in the width direction from the edge. In particular, it tends to be difficult to cut cleanly along the slit. On the other hand, in the second aspect, since the second perforation is formed in a zone separated from such an end by 8.5% or more of the width dimension of the sanitary thin paper, one end and the central part In the zone between, you can cut cleanly along the slits.

A third aspect of the present invention provides the sanitary thin paper, wherein the second perforations are continuous with the first perforations. In the present specification, the second perforation being continuous with the first perforation indicates that the first perforation and the second perforation are formed of a series or series of perforations.

In the third aspect, since the first perforation and the second perforation are continuous in this way, when the sanitary thin paper is cut, the force applied to the slit is easily transmitted from the first perforation to the second perforation. . Thereby, in the 3rd aspect, a slit can be cut cleanly from the 1st perforation to the 2nd perforation. Therefore, according to the third aspect, it is possible to further prevent the perforations from being torn in an unexpected direction and the excessive sanitary thin paper being pulled out due to the perforations not being cut.

A fourth aspect of the present invention provides sanitary thin paper, wherein the length of the second perforations is 20% or more and 32% or less of the width dimension of the sanitary thin paper. In this specification, the length of a perforation indicates the length of a zone in a slit in which cut portions and tie portions forming a perforation are alternately arranged. In addition, 20% or more and 32% or less of the width dimension of the sanitary thin paper means that the length of the second perforation is 20% or more of the width dimension of the sanitary thin paper when the width dimension of the sanitary thin paper is 100%. % or less.

In the conventional sanitary thin paper, when the sanitary thin paper is cut, even in the zone where the slit is formed between the end and the center in the width direction, especially when the width dimension of the sanitary thin paper is 100%, When the length of a part of the slit is in the range of 20% or more and 32% or less of the width dimension of the sanitary thin paper, the slit tends to be difficult to cut cleanly. On the other hand, in the fourth aspect, since a part of the range of such a slit is configured with the second perforation, in the zone between one end and the central part, further along the slit can be cut cleanly.

A fifth aspect of the present invention provides sanitary tissue paper, wherein the tie-cut ratio of the second perforations is 0.02 to 0.08. In the fifth aspect, by setting the tie-cut ratio of the second perforation to such a range, the zone between one end and the center (the zone where the sanitary tissue paper tends to tear in an unexpected direction) ), and you can cut cleanly along the slit. As a result, in the fifth aspect, it is possible to almost certainly prevent the sanitary thin paper from being torn in an unexpected direction and the excessive sanitary thin paper from being pulled out.

A sixth aspect of the present invention provides sanitary tissue paper, wherein the tie-cut ratio of the first perforations is 0.07 to 0.13. The zone near at least one end where the first perforations are formed cuts cleanly along the slit compared to the zone between the one end where the second perforations are formed and the central portion. , The slit is easily cut during manufacturing or packaging of the sanitary thin paper (hereinafter referred to as when not in use). On the other hand, in the sixth aspect, by setting the tie-cut ratio of the first perforation to such a range, the zone near the end where the first perforation is formed can be used when the sanitary thin paper is not used. Cut slits can be suppressed.

A seventh aspect of the present invention is a sanitary thin paper having a third perforation formed in the central portion, wherein the tie-cut ratio of the third perforation is greater than the tie-cut ratio of the second perforation. I will provide a. The central zone in the width direction where the slits are formed cuts cleanly along the slits compared to the zone between the one end and the central part where the second perforations are formed, but on the other hand, It is also a zone where the slit is easily cut when the sanitary tissue paper is not used. Therefore, by forming a third perforation having a higher tie-cut ratio than the second perforation at the center in the width direction, it is possible to suppress the slit from being cut at the center in the width direction when the sanitary thin paper is not used. can be done.

An eighth aspect of the present invention provides sanitary tissue paper, wherein the tie-cut ratio of the third perforations is 0.07 to 0.13. In the eighth aspect, by setting the tie-cut ratio of the third perforation to such a range, the slit is cut at the center of the width direction where the third perforation is formed when the sanitary thin paper is not used. can be suppressed further.

A ninth aspect of the present invention provides sanitary thin paper, wherein the first perforation has an edge cut portion continuous with the edge of the at least one end. That is, in the ninth aspect, the first perforation is provided with an edge cut portion that is continuous with the edge of at least one end in the width direction.

With such a configuration, in the ninth aspect, when the sanitary thin paper is torn off, the force applied to the perforations is easily transmitted from the edge of one end to the first perforations. Therefore, according to the ninth aspect, when part of the sanitary thin paper is to be cut, the slit can be easily cut at one end, and the sanitary thin paper can be cut off more easily.

A tenth aspect of the present invention provides sanitary thin paper, wherein the ratio of the edge cut length of the edge cut portion to the cut length of the first perforation is 0.02 to 0.16. In this specification, the cut length is the length in the width direction of the cut portion forming the perforation. Also, the ratio of the edge cut length of the edge cut portion to the cut length of the first perforation indicates the ratio of the edge cut length of the edge cut portion when the cut length of the first perforation is 1.

In the tenth aspect, by setting the ratio of the edge cut length of the edge cut portion to the cut length of the first perforation in such a range, the force applied to the perforations when the sanitary thin paper is cut is The first perforation facilitates transmission from the edge of one end. Therefore, according to the tenth aspect, when part of the sanitary thin paper is torn off, the entire perforations are easier to cut, and the sanitary thin paper can be cut off more easily.

Further, with such a configuration, in the tenth aspect, the edge cut portion continuous with the edge of at least one edge in the width direction of the sanitary thin paper is less likely to be turned over. Therefore, according to the tenth aspect, unexpected breakage of the sanitary thin paper and product defects can be prevented when the sanitary thin paper is unused.

An eleventh aspect of the present invention provides sanitary thin paper, wherein the ratio of the edge cut length of the edge cut portion to the cut length of the second perforation is 0.01 to 0.08. In this specification, the ratio of the edge cut length of the edge cut portion to the cut length of the second perforation is the ratio of the edge cut length of the edge cut portion when the cut length of the second perforation is 1 indicates

In the eleventh aspect, when the sanitary thin paper is cut, the force applied to the perforations is easily transmitted from the edge of one end to the second perforations via the first perforations. Therefore, according to the eleventh aspect, when part of the sanitary thin paper is torn off, the entire perforations are easier to cut, and the sanitary thin paper can be cut off more easily.

According to one aspect of the present invention, it is possible to provide sanitary tissue paper that can be easily cut.

It is a figure which shows the sanitary thin paper which concerns on embodiment of this invention. It is the figure which expanded a part of sanitary thin paper which concerns on this embodiment, and looked at the thickness direction. 4 is an enlarged view of the slit of the sanitary thin paper according to the present embodiment; FIG. It is a figure which shows the use condition (before cutting) of the sanitary thin paper which concerns on this embodiment. FIG. 4 is a diagram showing the state of use (after cutting) of the sanitary thin paper according to the present embodiment; 1 is a diagram showing a conventional sanitary tissue paper; FIG. FIG. 10 is a diagram showing the state of use of conventional sanitary thin paper (after being cut).

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this specification, the scale of each member in each drawing may differ from the actual scale in order to facilitate understanding. In addition, in the description below, the same reference numerals are given to parts that are common in each drawing, and the description may be omitted.

Also, in this specification, a three-dimensional orthogonal coordinate system with three axial directions (X direction, Y direction, and Z direction) is used. In this specification, the X direction indicates the longitudinal direction (pulling direction) of the sanitary thin paper, the Y direction indicates the width direction intersecting (perpendicular to) the longitudinal direction (pulling direction) of the sanitary thin paper, and the Z direction indicates the sanitary thin paper. shows the thickness direction of

FIG. 1 is a diagram showing a sanitary thin paper according to an embodiment of the present invention. FIG. 2 is an enlarged view of a part of the sanitary thin paper according to the present embodiment as seen in the thickness direction (Z direction). Further, FIG. 3 is an enlarged view of the slit of the sanitary thin paper according to this embodiment.

In FIG. 1, reference numeral 100 denotes kitchen paper, which is an example of the sanitary thin paper of the present invention. The aspect of the sanitary thin paper (kitchen paper 100) is not particularly limited, but for example, a rolled kitchen paper (hereinafter sometimes referred to as a thin paper roll or kitchen roll) as shown in FIG. 1 can be used.

As shown in FIG. 1, the roll-shaped kitchen paper 100 is obtained by winding a strip-shaped sheet ST around a paper tube PT. A slit 10 is formed in the strip-shaped sheet ST. The slits 10 are arranged at predetermined intervals L in the longitudinal direction (X direction) of the strip-shaped sheet ST, and are formed of perforations extending in the width direction (Y direction) intersecting the longitudinal direction (X direction).

In such a roll-shaped kitchen paper 100, one sheet of kitchen paper KP is obtained by pulling out the wound sheet ST and cutting the sheet ST along the perforations M (see FIG. 5). Note that such a usage pattern is sometimes called a pick-up type. Note that the sanitary thin paper (kitchen paper) 100 is not limited to a roll shape, and may be a stack of strip-shaped sheets ST folded.

Moreover, the sanitary thin paper according to the present embodiment is not limited to kitchen paper, and can be applied to sanitary thin paper such as tissue paper and paper towels. These sanitary thin papers are not limited to dry type, but also include wet type sanitary thin papers impregnated with water, chemical solutions, or the like. In addition, sanitary thin paper can be used for both home use and business use.

The dimensions of the sanitary thin paper (kitchen paper) 100 are not particularly limited, but for example, in the case of the kitchen rolls shown in FIGS. The interval L is 100 mm to 300 mm, and the thickness (2 plies) of the sheet ST is 100 μm to 1100 μm.

A sheet ST forming the sanitary thin paper (kitchen paper) 100 is made of crepe paper. Crepe paper is paper on which fine wrinkles are formed on the surface by applying a blade called a doctor blade at the outlet of the dryer of the paper machine during the papermaking process.

As the crepe paper forming the sheet ST, paper whose main raw material is pulp is used. A known composition for kitchen paper can be used for the pulp composition. For example, the pulp content can be 50% by mass or more, preferably 90% by mass or more, and more preferably 100% by mass.

In addition, the pulp composition of crepe paper is, for example, 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). can be used in any suitable ratio. In particular, it is preferable that the pulp composition has a higher ratio of softwood pulp to hardwood pulp. The ratio of softwood pulp to hardwood pulp is preferably from 50:50 to 80:20.

The basis weight of the crepe paper is not particularly limited, but for example, the basis weight (or basis weight) measured according to JIS P 8124 (1998) can be used. When the sanitary thin paper is kitchen paper 100, the basis weight of the crepe paper constituting the sanitary thin paper is preferably 14.0 to 50.0 g/m ² , more preferably 15.0 to 30.0 g per ply. /m ² , particularly preferably 16.0 to 24.0 g/m ² .

The thickness of the crepe paper is not particularly limited, but for example, the thickness measured under the environment of JIS P 8111 (1998) can be used. When the sanitary thin paper is the kitchen paper 100, the thickness of the crepe paper is 50 μm to 550 μm, preferably 70 to 500 μm, more preferably about 100 to 330 μm per ply.

In addition, the method of measuring the paper thickness is, after the test piece is sufficiently conditioned under the conditions of JIS P 8111 (1998), under the same conditions, a dial thickness gauge (thickness measuring instrument) "PEACOCK G type" (manufactured by Ozaki Seisakusho) ) to measure in a 2-ply state. Specifically, after confirming that there is no dust or dust between the plunger and the measuring table, the plunger is lowered onto the measuring table, and the memory of the dial thickness gauge is moved to adjust the zero point. The plunger is then raised to place the sample on the test bench and the gauge is read as the plunger is slowly lowered. At this time, the plunger is only put on. The terminal of the plunger is made of metal, and a circular plane with a diameter of 10 mm is brought into vertical contact with the plane of the paper. Moreover, the load at the time of paper thickness measurement is about 70 gf. For the paper thickness, an average value obtained by measuring 10 times is used.

Further, the crepe paper forming the sheet ST may be embossed in the state of one ply. Such embossing is performed, for example, by pressing a convex embossing roll (not shown) against the crepe paper by a known steel rubber embossing method to form convex embossments on one surface of the crepe paper. Also, concave embossments corresponding to the convex embossments are formed on the other surface of the crepe paper.

The shape of the apex of the convex embossing formed on the crepe paper (or the opening of the concave embossing corresponding to the convex embossing) is not particularly limited, but may be, for example, a square shape, a triangular shape, a circular shape, or the like in plan view. can be Moreover, the side surface of the convex embossment is preferably tapered (not shown) from the surface of the crepe paper on which the convex embossment is not formed toward the top of the convex embossment. By providing convex embossments having such tapered side surfaces, the kitchen paper 100 is less likely to be crushed in the thickness direction (Z direction).

The number of plies of the sheet ST constituting the sanitary thin paper (kitchen paper) 100 is not particularly limited, but may be one ply or more, preferably two plies (two plies stacked). Although the shape of the sanitary thin paper is not particularly limited, for example, it is preferable that the contour shape of the plane is rectangular. The sanitary thin paper (kitchen paper 100) of this embodiment is formed of two plies (two sheets stacked) of crepe paper on which the convex embossments are formed.

Specifically, the kitchen paper 100 of this embodiment has a laminated structure in which two sheets of crepe paper having convex embossments are laminated and integrated. The form of such a laminated structure is not particularly limited, and a tip-to-tip type laminated structure, a nested type laminated structure, etc., which are employed in the laminated structure of kitchen paper, can be adopted.

Also, such a laminated structure can be formed by adhering two sheets of crepe paper together with an adhesive. As such an adhesive, a known adhesive employed for kitchen paper having a laminated structure can be used. Examples of such adhesives include polyvinyl alcohol, starch, modified starch, and cellulosic adhesives such as carboxymethylcellulose.

In the sanitary thin paper 100 according to this embodiment, as shown in FIGS. 2 and 3, the slit 10 (perforations M) has a first perforation 11 and a second perforation 12 . The first perforations 11 are formed near at least one end in the width direction (Y direction). The second perforations 12 are formed between the central portion WC and the first perforations 11 in the width direction (Y direction).

In addition, at least one end in the width direction (Y direction) is a zone of one of the end portions WA and WB in the width direction (Y direction) of the sanitary thin paper 100 where the slit 10 is formed. Or indicate each zone on both ends. In this embodiment, as shown in FIGS. 2 and 3, the first perforations 11 are formed in a zone S1 near one end WA in the width direction (Y direction) and a zone S5 near the other end WB. It is

A central portion WC indicates a zone S3 including the center of the sanitary thin paper 100 in the width direction (Y direction) and its periphery. In this embodiment, as shown in FIGS. 2 and 3, neither the first perforation 11 nor the second perforation 12 is formed in the central portion, and a third perforation, which will be described later, is formed.

In addition, between the central portion WC in the width direction (Y direction) and the first perforation 11, there is a zone S3 of the central portion WC in the width direction (Y direction) where the slit 10 is formed and a zone near one end WA. Zone S2 between zone S1 and/or zone S4 between zone S3 in the center WC in the width direction (Y direction) and zone S5 near the other end WB. In the present embodiment, as shown in FIGS. 2 and 3, the second perforation 12 has a zone S1 near one end, a zone S3 near the center WC, and a zone S5 near the other end WB. are formed in different zones (zone S2 and zone S4).

In this embodiment, the tie-cut ratio TC2 of the second perforations 12 is smaller than the tie-cut ratio TC1 of the first perforations 11 . Here, the tie cut ratio TC is the ratio of the length of the tie portion MT to the length of the cut portion MC in the direction in which the perforations M extend.

In the perforations M forming the slit 10, cut portions (hereinafter referred to as cut portions) MC and uncut portions (hereinafter referred to as tie portions) MT between two adjacent cut portions MC are alternately arranged. It is a structure (see FIG. 3). The smaller the tie cut ratio, the greater the ratio of the length of the cut portion MC to the length of the tie portion MT, so that the perforation M becomes easier to cut. On the other hand, as the tie-cut ratio increases, the ratio of the length of the cut portion MC to the length of the tie portion MT decreases, so that the perforation M becomes more difficult to cut.

In the sanitary thin paper 100 according to this embodiment, the tie-cut ratio TC1 of the first perforations 11 is arbitrary, but is preferably 0.07 to 0.13, more preferably 0.08 to 0.12, It is more preferably 0.09 to 0.11. Note that the tie cut ratio TC1 is the length of the tie portion 11b relative to the length (cut length) C1 of the cut portion 11a, in units of the cut portion 11a and the tie portion 11b that are adjacent to each other in the direction in which the first perforations 11 extend. long) is the ratio of T1.

In addition, the tie-cut ratio TC2 of the second perforations 12 is arbitrary, but is preferably 0.02 to 0.08, more preferably 0.03 to 0.07, and still more preferably 0.04 to 0. .06 . Note that the tie-cut ratio TC2 is the length of the tie portion 12b relative to the length (cut length) C2 of the cut portion 12a in units of the cut portion 12a and the tie portion 12b that are adjacent to each other in the direction in which the second perforations 12 extend. length) is the ratio of T2.

In the sanitary thin paper 100 according to this embodiment, the second perforation 12 is formed at a position (zone S2) that is 8.5% or more of the width dimension of the sanitary thin paper 100 away from one end WA. The second perforation 12 is also formed at a position (zone S4) spaced apart from the other end WB by 8.5% or more of the width dimension of the sanitary thin paper.

In other words, when the width dimension of the sanitary thin paper 100 is 100%, the zone S2 and the zone S4 in which the second perforations 12 are formed have one end WA and the other end WA in the width direction (Y direction). They are arranged at positions at least 8.5% of the width dimension of the sanitary thin paper in the width direction (Y direction) from the WB toward the central portion WC. For example, when the sanitary thin paper 100 has a width of 228 mm, the second perforation 12 is formed at a position (zone S2) 20 mm or more away from one end WA. Also, the second perforation 12 is formed at a position (zone S4) at a distance of 20 mm or more from the other end WB.

In the sanitary thin paper 100 according to this embodiment, the second perforations 12 are formed continuously with the first perforations 11 . Specifically, the first perforation 11 and the second perforation 12 are formed of a series or a series of perforations M. As shown in FIG.

In the sanitary thin paper 100 according to this embodiment, the length of the second perforations 12 is 20% or more and 32% or less of the width dimension of the sanitary thin paper. Here, the length of the perforation M indicates the length of the zone in the slit 10 in which the cut portions MC and the tie portions MT constituting the perforation M are alternately arranged.

In addition, when the width dimension of the sanitary thin paper 100 is 20% or more and 32% or less of the width dimension of the sanitary thin paper 100, the length of the second perforation 12 is equal to the width dimension of the sanitary thin paper 100 when the width dimension of the sanitary thin paper 100 is 100%. 20% or more and 32% or less. For example, when the sanitary thin paper 100 has a width of 228 mm, the length of the second perforations 12 is about 50 mm or more and 70 mm or less.

The sanitary thin paper 100 according to this embodiment further has third perforations 13 . The third perforations 13 are formed in the central portion WC (zone S3) as shown in FIG. Also, the tie-cut ratio TC3 of the third perforations 13 is greater than the tie-cut ratio TC2 of the second perforations 12 .

In addition, in the sanitary thin paper 100 according to the present embodiment, the tie-cut ratio TC3 of the third perforations 13 is arbitrary as long as it is greater than the tie-cut ratio TC2 of the second perforations 12, but preferably 0.07 to 0.07. 13, more preferably 0.08 to 0.12, more preferably 0.09 to 0.11. Note that the tie-cut ratio TC3 is the length of the tie portion 13b relative to the length (cut length) C3 of the cut portion 13a in units of the cut portion 13a and the tie portion 13b that are adjacent to each other in the direction in which the third perforations 13 extend. (long) is the ratio of T3. In this embodiment, the tie-cut ratio TC3 of the third perforation 13 is equal to the tie-cut ratio TC1 of the first perforation 11 .

In the sanitary thin paper 100 according to this embodiment, the first perforation 11 further has an edge cut portion 11c. As shown in FIG. 3, the edge cut portion 11c is formed continuously with the edge of at least one end. In this embodiment, the edge cut portion 11c of the first perforation 11 is formed continuously with the edge AE at one end WA in the width direction (Y direction), and is formed continuously with the edge BE at the other end WB. are formed continuously.

In the sanitary thin paper 100 according to the present embodiment, the ratio of the edge cut length CE of the edge cut portion 11c to the cut length C1 of the first perforation 11 is preferably 0.02 to 0.16, more preferably 0.03 to 0.13, more preferably 0.04 to 0.11. Here, the cut length indicates the length of the cut portion MC forming the perforation M in the width direction (Y direction). Also, the ratio of the edge cut length CE of the edge cut portion 11c to the cut length C1 of the first perforation 11 is the edge of the edge cut portion 11c when the cut length C1 of the first perforation 11 is set to 1. It shows the ratio of the cut length CE.

In the sanitary thin paper 100 according to this embodiment, the ratio of the edge cut length CE of the edge cut portion 11c to the cut length C2 of the second perforation 12 is preferably 0.01 to 0.16, more preferably 0.02 to 0.13, more preferably 0.03 to 0.11. Here, the ratio of the edge cut length CE of the edge cut portion 11c to the cut length C2 of the second perforation 12 is the edge of the edge cut portion 11c when the cut length C2 of the second perforation 12 is 1. The ratio of the edge cut length CE is shown.

4 and 5 are diagrams showing the state of use of the sanitary thin paper according to this embodiment. Here, the effects of this embodiment will be described with reference to FIGS. 4 and 5. FIG. In this embodiment, as shown in FIG. 4, a portion of the sanitary thin paper 100 (kitchen paper KP) is cut off while holding (or pinching) the sanitary thin paper 100 with one hand H and pulling it out in the PD direction. Specifically, along each slit 10 (perforations M) arranged in the longitudinal direction (X direction), from one end WA or the other end WB in the width direction (Y direction) to the width direction (Y direction), the sanitary tissue paper 100 is cut toward the center WC.

At this time, in the conventional sanitary thin paper 100, although the zone S1 near one end WA and the zone S5 near the other end WB are cleanly cut along the slit 10, the one end WA and the central part WC are cut cleanly. and a zone S4 between the other end WB and the center WC (the zone S1 near the one end WA, the zone S3 near the center WC, and the zone S5 near the other end WB). and ) tend not to cut cleanly along the slit 10 . Therefore, there is a tendency that the sanitary thin paper 100 is torn in an unexpected direction, or excess sanitary thin paper 100 is pulled out without cutting the perforations M.

In contrast, in the present embodiment, as described above, the first sewing machine having a large tie-cut ratio is provided in the zone S1 near one end WA in the width direction (Y direction) and the zone S5 near the other end WB. An eye 11 is formed. Second perforations 12 having a small tie-cut ratio are formed in a zone S2 between one end WA and the central portion WC and a zone S4 between the other end WB and the central portion WC. . As a result, in this embodiment, the zone S2 between one end WA and the central portion WC and the zone S4 between the other end WB and the central portion WC can also be neatly cut along the slit 10. can.

In addition, in the present embodiment, cutting of the sanitary thin paper 100 starts from one end WA side or the other end WB side in the width direction (Y direction) and proceeds toward the center portion WC in the width direction (Y direction). However, the cutting direction gradually stabilizes from the first perforation 11 having a large tie-cut ratio to the second perforation 12 having a small tie-cut ratio. Even if the progress of cutting reaches the central portion WC and further reaches the other end WB side or one end WA side in the width direction (Y direction), the cutting progresses while the cutting direction is stable. can be done.

Thereby, in this embodiment, even if the sanitary thin paper 100 is not fixed or is unstable, the sanitary thin paper 100 can be cut at the position where the perforations M are formed. Specifically, as shown in FIG. 4, when the kitchen paper 100 is a kitchen roll (thin paper roll), this thin paper roll is rotatably installed on a holder (support rod RS). Then, the tip of the kitchen paper 100 placed on the support rod RS is grasped with one hand H, and the kitchen paper KP is cut off from the thin paper roll while pulling out the kitchen paper 100 in the PD direction. At this time, with the kitchen paper 100, one kitchen paper KP can be cut off with one hand H without pressing the thin paper roll of the kitchen paper 100. - 特許庁

Therefore, in this embodiment, it is possible to prevent the sanitary thin paper 100 from tearing in an unexpected direction when part of the sanitary thin paper 100 is cut. In addition, it is possible to prevent excess sanitary thin paper 100 from being pulled out. Therefore, according to this embodiment, it is possible to provide the sanitary thin paper 100 that can be easily cut.

In addition, in the conventional sanitary thin paper, when the sanitary thin paper 100 is cut, even in the zone S2 between one end WA and the central portion WC in the width direction (Y direction), especially from one end WA There is a tendency that the slits 10 are not cleanly cut in zones separated by 20 mm or more in the width direction (Y direction). In addition, among the zones S4 between the other end WB in the width direction (Y direction) and the central portion WC, particularly in the zone 20 mm or more away from the other end WB in the width direction (Y direction), the slit It tends not to cut cleanly along 10 .

On the other hand, in the present embodiment, as described above, the second perforations 12 are formed in a zone separated by 20 mm or more from the one end WA, so that the distance between the one end WA and the central portion WC It is possible to cleanly cut along the slit 10 in the zone S2 of . In addition, since the second perforation 12 is also formed in a zone 20 mm or more away from the other end WB, even in the zone S2 between the other end WB and the central portion WC, the second perforation 12 is also formed along the slit 10. can be cut cleanly.

Further, in the present embodiment, as described above, the first perforation 11 and the second perforation 12 are continuously formed, so that when the sanitary thin paper 100 is cut, the force applied to the slit 10 is the first It becomes easy to be transmitted from the perforation 11 to the second perforation 12.例文帳に追加Thereby, in this embodiment, the slit 10 can be cleanly cut from the first perforation 11 to the second perforation 12 . Therefore, according to the present embodiment, it is possible to further prevent the perforations M of the slit 10 from being torn in an unexpected direction and the extra sanitary thin paper 100 being pulled out due to the perforations M not being cut.

Further, in the conventional sanitary thin paper, when the sanitary thin paper 100 is cut, among the zones in which the slit 10 is formed between one end WA and the central portion WC in the width direction (Y direction), the slit When the length of a part of 10 is in the range of 50 mm or more and 70 mm or less, slit 10 tends not to be cut cleanly.

In contrast, in the present embodiment, as described above, the zone S2 between one end WA in the width direction (Y direction) and the central portion WC and the other end WBA in the width direction (Y direction) The length of the zone S4 between the central portion WC and the second perforation 12 is 50 mm or more and 70 mm or less. Therefore, according to this embodiment, both the zone S2 between one end WA and the central part WC and the zone S4 between the other end WB and the central part WC further along the slit 10 can be cut cleanly.

In addition, in the present embodiment, by setting the tie-cut ratio TC2 of the second perforations 12 within the range described above, the zone S2 between one end WA and the central portion WC can be neatly sewn along the slit 10. can cut. The zone S4 between the other end WB and the central portion WC can also be cleanly cut along the slit 10. FIG. As a result, in this embodiment, it is possible to almost certainly prevent the sanitary thin paper 100 from being torn in an unexpected direction and the excess sanitary thin paper 100 from being pulled out.

Note that the zone S1 closer to one end WA where the first perforations 11 are formed is greater than the zone S2 between the one end WA where the second perforations 12 are formed and the central portion WC. , The sanitary thin paper 100 can be cut cleanly along the slit 10, but it is easy to cut when the sanitary thin paper 100 is not used. Further, the zone S5 near the other end WB where the first perforations 11 are formed is compared to the zone S4 between the other end WB where the second perforations 12 are formed and the central portion WC. , The sanitary thin paper 100 can be cut cleanly along the slit 10, but it is easy to cut when the sanitary thin paper 100 is not used.

On the other hand, in the present embodiment, by setting the tie-cut ratio TC1 of the first perforations 11 to the range described above, the zone S1 near one end WA where the first perforations 11 are formed is sanitary. It is possible to prevent the slit 10 from breaking when the thin paper 100 is not used.

Note that the zone S3 of the central portion WC in the width direction (Y direction) where the slits 10 are formed is the zone S2 between one end portion WA and the central portion WC where the second perforations 12 are formed, or the second zone WC. Compared to the zone S4 between the other end WB where the perforations 12 are formed and the central part WC, the slit 10 can be cut cleanly along the slit 10, but on the other hand, the slit 10 is easily cut when the sanitary thin paper 100 is not used. Also a zone.

On the other hand, in the present embodiment, as described above, the third perforations 13 having a larger tie-cut ratio TC2 than the second perforations 12 are formed in the central portion WC in the width direction (Y direction). At the central portion WC in the width direction (Y direction), it is possible to prevent the slit 10 from breaking when the sanitary thin paper 100 is not used.

In the present embodiment, by setting the tie-cut ratio TC3 of the third perforations 13 within the range described above, the thickness of the sanitary thin paper 100 is reduced at the central portion WC in the width direction (Y direction) where the third perforations 13 are formed. It is possible to further prevent the slit 10 from breaking during use.

Further, in the present embodiment, since the first perforation 11 has the edge cut portion 11c as described above, when the sanitary thin paper 100 is cut, the force applied to the perforation M is reduced to the edge of one end WA. It becomes easy to be transmitted to the first perforation 11 from the edge AE. Further, the force applied to the perforation M is easily transmitted to the first perforation 11 from the edge BE of the other end WB. Therefore, according to the present embodiment, when part of the sanitary thin paper 100 is to be cut, the slit 10 can be easily cut at either the one end WA side or the other end WB side, and the sanitary thin paper 100 can be cut more easily. become easier.

Further, in the present embodiment, by setting the ratio of the edge cut length CE of the edge cut portion 11c to the cut length C1 of the first perforation 11 to the range described above, when the sanitary thin paper 100 is cut, the perforation The first perforations 11 make it easier for the force applied to M to be transmitted from either the edge AE of one end WA or the edge BE of the other end WB. Therefore, according to the present embodiment, when part of the sanitary thin paper 100 (kitchen paper KP) is torn off, the entire perforations M are easier to cut, and the sanitary thin paper 100 can be cut off more easily.

In addition, with such a configuration, in the present embodiment, the edge cut portion 11c continuous with the edge AE of one edge WA in the width direction (Y direction) of the sanitary thin paper 100 and the edge of the other edge WB Neither the end edge cut portion 11c that is continuous with the BE is easily turned over. Therefore, according to the present embodiment, unexpected breakage of the sanitary thin paper 100 and product defects can be prevented when the sanitary thin paper 100 is unused.

Further, in the present embodiment, by setting the ratio of the edge cut length CE of the edge cut portion 11c to the cut length C2 of the second perforation 12 to the range described above, when the sanitary thin paper 100 is cut, the perforations The force applied to M is easily transmitted from the edge AE of one end WA to the second perforation 12 via the first perforation 11 . Therefore, according to this embodiment, when part of the sanitary thin paper 100 is torn off, the entire perforations M are easier to cut, and the sanitary thin paper 100 is easier to cut.

EXAMPLES The present invention will be specifically described below with reference to examples. However, the present invention is still not limited to only these examples. Each physical property of Examples and Comparative Examples was measured by the following methods.

<Basis weight of sanitary thin paper>
Basis weight (weight per square meter) (g/m ² ) of crepe paper (base paper) of sanitary thin paper (kitchen paper) was calculated according to JIS P 8124 (1998). The grammage was calculated as the grammage per ply.

<Cut-off test>
Kitchen paper 100 (kitchen roll) was set in a holder (base shape: circular, base diameter: 120 mm, base thickness: 15 mm, support rod height: 300 mm, support rod diameter: 15 mm) (on the kitchen roll paper tube PT A support rod RS was inserted). Hold (fix) the kitchen paper 100 (kitchen roll) with one hand, hold the tip of the kitchen paper 100 with the other hand H, and hold the kitchen paper KP (sheet ST) at a predetermined interval L in the longitudinal direction (PD direction). and cut it off (see Figures 4 and 5). This operation was performed 5 times for each example and comparative example, and the number of times the kitchen paper KP (sheet ST) was torn (or torn) in the longitudinal direction at this time was confirmed.

<Tensile test>
A test piece was prepared by forming a slit 10 (perforation M) near one end in the longitudinal direction (X direction) of kitchen paper KP (sheet ST). The dimensions of the test piece are about 228 mm in the width direction (Y direction), about 240 mm in the longitudinal direction (X direction), and the distance from the end of the longitudinal direction (X direction) to the slit 10 (perforation M). was about 20 mm. A tensile test was performed on this test piece. In this test, a push-pull gauge ("Z2-20N" manufactured by IMADA) was attached to a tensile tester ("MX-500N" manufactured by IMADA). A clip (eyeball clip MD-3A manufactured by Sancake.com, narrow mouth width: about 40 mm) was attached to the push-pull gauge. This clip was attached to the specimen. The center of the tip of the clip is positioned about 70 mm away from the other end WB (edge BE) in the width direction (Y direction) of the test piece, and the tip of the clip is positioned in the longitudinal direction (X direction) of the test piece. ) at one end in the longitudinal direction (X direction) of the test piece so as to be about 15 mm away from the slit 10 (perforation M). The other end side of the test piece was fixed, and this test piece was pulled in the longitudinal direction (X direction) at a speed of 300 mm / min 5 times, and the kitchen paper KP (sheet ST) at this time was torn in the longitudinal direction ( or torn).

Examples and comparative examples are described below.

[Example 1]
The basis weight (one ply) of the sanitary thin paper (kitchen paper) was about 21 g/m ² . The kitchen paper (kitchen roll) had a roll diameter R of about 110 mm, a roll width W of about 280 mm, a predetermined interval L of about 220 mm, and a thickness (2 plies) of about 0.7 mm. The slits 10 extending in the width direction (Y direction) are arranged at predetermined intervals L in the longitudinal direction (X direction). In the slit 10, first perforations 11 are formed near one end WA (zone S1) and near the other end WB (zone S5) in the width direction (X direction). A second perforation 12 is formed continuously with the first perforation 11 between the central portion WC and the first perforation 11 (zones S2 and S4), and a third perforation 13 is formed in the central portion WC (zone S3). was formed continuously with the second perforation 12 . In the first perforation 11 (zone S1), the cut length C1 is about 7.0 mm, the tie length T1 is about 0.7 mm, the tie cut ratio TC1 is about 0.10, both ends WA in the width direction (Y direction), The edge cut length CE of WB was set to about 0.5 mm. In the second perforations 12 (zones S2 and S4), the cut length C2 is about 14.78 mm, the tie length T2 is about 0.7 mm, the tie cut ratio TC2 is about 0.05, and the two ends WA and WB are 20 mm apart. The length of the second perforations 12 (zones S2 and S4) was about 70 mm. At the third perforation 13 (zone S3), the cut length C3 was about 7.0 mm, the tie length T3 was about 0.7 mm, and the tie cut ratio TC3 was about 0.10. The conditions and results of Example 1 are shown in Table 1.

[Example 2]
Same as Example 1 except that the cut length C2 was about 7.0 mm, the tie length T2 was about 0.4 mm, and the tie cut ratio TC2 was about 0.06 at the second perforations 12 (zones S2 and S4). made it Table 1 shows the conditions and results of Example 2.

[Comparative Example 1]
The slit 10 was formed in the same manner as in Example 1, except that the entire slit 10 was formed only by the first perforation 11 (M) (the second perforation 12 was not provided) and the edge cut portion was not provided. Table 1 shows the conditions and results of Comparative Example 1.

[Comparative Example 2]
In the slit 10, second perforations 21 are formed near one end WA (zone S1) and near the other end WB (zone S5) in the width direction (X direction), and second perforations 12 (zone S1 , S5), the cut length C2 is about 6.6 mm, the tie length T2 is about 0.3 mm, the tie cut ratio TC2 is about 0.05, and the zone S2 other than both ends WA and the WB side (zone S1, zone S5) The procedure was the same as in Example 1, except that the first perforations 11 were formed in S4 to S4, and the edge cut portion was not provided. Table 1 shows the conditions and results of Comparative Example 2.

[Comparative Example 3]
The entire slit 10 is formed only by the first perforation 11 (M) (no second perforation 12 is provided), and the first perforation 11 has a cut length C1 of about 7.0 mm and a tie length T1 of about 1. Same as Example 1, except that it was .2 mm, had a tie cut ratio TC1 of about 0.17, and had no edge cuts. Table 1 shows the conditions and results of Comparative Example 3.

In the slit 10, a first perforation 11 having a large tie-cut ratio is formed in a zone S1 near one end WA in the width direction (Y direction) and a zone S5 near the other end WB. The kitchen paper 100 having the second perforations 12 with a small tie-cut ratio formed in the zone S2 between the WA and the central portion WC and the zone S4 between the other end WB and the central portion WC was subjected to the cut-off test, Both tensile tests were cleanly cut along the slit 10 (perforation M) (Examples 1 and 2).

On the other hand, kitchen paper 100 in which only the first perforations 11 (zones S1 and S5) were formed in the slit 10 and the second perforations 12 (zones S2 and S4) were not formed (Comparative Examples 1 and 3 ), and the kitchen paper 100 (Comparative Example 2) in which the second perforations 12 were not formed between the central portion WC and the first perforations 11 (zones S2 and S4) in the width direction (X direction) were cut off. Both the test and the tensile test failed at least once.

From these results, the slit arranged in the sanitary thin paper has a first perforation formed near at least one end in the width direction, and is formed between the central part in the width direction and the first perforation. It has been found that sanitary tissue paper that is easy to tear can be obtained by having a second perforation that is smooth and the tie-cut ratio of the second perforation is smaller than the tie-cut ratio of the first perforation.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the invention described in the claims. It is possible.

100 Sanitary thin paper KP Kitchen paper ST Sheet L Spacing WA One end AE Edge WB The other end BE Edge WC Center M Perforation 10 Slit 11 First perforation 11a Cut portion 11b Tie portion 11c Edge cut portion 11d Edge cut portion C1 Cut length T1 Tie length CE Edge cut length 12 Second perforation 12a Cut portion 12b Tie portion C2 Cut length T2 Tie length 13 Third perforation 13a Cut portion 13b Tie portion C3 Cut length T3 Tie length S1 to S5 zones

Claims (9)

Sanitary thin paper having slits arranged at predetermined intervals in the longitudinal direction and extending in the width direction intersecting the longitudinal direction,
The slit is
a first perforation formed near at least one end in the width direction;
a second perforation formed between the central portion in the width direction and the first perforation;
The tie-cut ratio of the second perforation is smaller than the tie-cut ratio of the first perforation,
The sanitary thin paper, wherein the tie-cut ratio of the first perforations is 0.07 to 0.13 and the tie-cut ratio of the second perforations is 0.02 to 0.08. 2. The sanitary thin paper according to claim 1, wherein said second perforation is formed at a position separated from said at least one end by 8.5% or more of the width dimension of said sanitary thin paper. The sanitary tissue paper according to claim 1, wherein said second perforation is continuous with said first perforation. The sanitary thin paper according to any one of claims 1 to 3, wherein the length of the second perforations is 20% or more and 32% or less of the width dimension of the sanitary thin paper. Having a third perforation formed in the central portion,
The sanitary tissue paper according to any one of claims 1 to 4 , wherein the tie-cut ratio of the third perforation is greater than the tie-cut ratio of the second perforation. The sanitary thin paper according to claim 5 , wherein the tie-cut ratio of the third perforation is 0.07 to 0.13. The sanitary thin paper according to any one of claims 1 to 6 , wherein the first perforation has an edge cut portion continuous with the edge of the at least one end portion. The sanitary thin paper according to claim 7 , wherein the ratio of the edge cut length of the edge cut portion to the cut length of the first perforation is 0.02 to 0.16. The sanitary thin paper according to claim 7 , wherein the ratio of the edge cut length of the edge cut portion to the cut length of the second perforation is 0.01 to 0.08.

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