JP6458836B2 - Sanitary paper for toilet roll and method for producing the same - Google Patents

Description

  The present invention relates to a toilet roll sanitary paper obtained by joining a plurality of sheets that are superposed on each other with an adhesive, and a method for manufacturing the same.

  Sanitary papers such as toilet rolls and kitchen paper are often configured by stacking a plurality of thin paper sheets, generally two sheets, for the purpose of preventing moisture penetration and improving the texture. In this case, in order to prevent peeling of the two thin papers, the embossing for joining is continuously formed on the two thin papers in the overlapped state along both side edges in the width direction, or the glue is used. Two thin papers are joined using A technique for joining two thin paper sheets using this glue is described in Patent Documents 1 and 2, for example. More specifically, at least one thin paper is embossed, and the embossing is used to apply glue to the top surface of the convex portion protruding to the joint surface side with the other thin paper, and the other thin paper is passed through this glue. Is bonded to one thin paper.

  On the other hand, in water-decomposable sanitary paper such as a toilet roll, a technique that prevents the sanitary paper from being torn by preventing moisture from getting through and slowing the moisture permeation rate is known from Patent Document 3 and the like. Usually, such a sizing agent is added in advance to the stock during paper making, or is added to the surface of the thin paper immediately after paper making.

JP 2009-178454 A Japanese Patent No. 4647319 Japanese Patent No. 4776989

  The conventional methods disclosed in Patent Documents 1 and 2 in which glue is applied to the top of the convex portion formed on the thin paper by embossing and the two thin papers are joined together, The problem is that the suppleness is lost and the texture is lowered.

  On the other hand, in the conventional method disclosed in Patent Document 3, since the sizing agent is uniformly contained over the entire area of the thin paper, the sizing agent is interposed even at the side edge of the thin paper that hardly requires the addition of the sizing agent. As a result, the water disintegration property of the sanitary paper may be unnecessarily impaired. In addition, the sizing agent is wasted, and the material cost cannot be saved.

  The objective of this invention is providing the sanitary paper for toilet rolls which can suppress the fall of the texture accompanying use of the adhesive agent for joining several sheets, and its manufacturing method.

  Another object of the present invention is to provide a water-degradable toilet roll sanitary paper effectively using a sizing agent and a method for producing the same.

  A first aspect of the present invention is a toilet roll sanitary paper in which a plurality of sheets are overlapped with each other, and at least one of the two adjacent sheets among the plurality of sheets is embossed An adhesive for joining the other sheet is applied to the top surface of the convex portion that is formed on the one sheet by this embossing and protrudes to the other sheet side. Is a sanitary paper for toilet rolls, which contains a paper quality improver.

  The adhesive in the present invention is a water-soluble polymer such as methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, from the viewpoint of maintaining good texture and water degradability. In addition to polyvinyl pyrrolidone, polyvinyl alcohol and the like, these derivatives and mixtures thereof can be mentioned, but are not limited thereto.

  In the toilet roll sanitary paper according to the present invention, the paper quality improving agent may include at least one of a humectant and a sizing agent, but is not limited thereto. The paper quality improving agent in the present invention may be anything as long as the desired paper quality can be obtained.

  When the paper quality improver is a moisturizer, this moisturizer includes polysiloxanes such as silicone oil and silicone powder, polyhydric alcohols such as glycerin and propylene glycol, saccharides such as sorbitol and glucose, higher alcohols such as cetanol and oleyl alcohol, Liquid paraffin, glycol solvents and derivatives thereof can be generally used, but are not limited thereto. At least one of these is added to the previous adhesive and mixed uniformly. In this case, the weight ratio of the humectant to the adhesive is preferably in the range of 30 to 70%. When the weight ratio of the humectant to the adhesive is less than 30%, it is difficult to clearly suppress the effect of the present invention, that is, the decrease in the texture of the sanitary paper for toilet rolls associated with the use of the adhesive. Conversely, when the weight ratio of the humectant to the adhesive exceeds 70%, the bonding strength between the two sheets is insufficient, and the sheets are likely to be separated.

  When the paper quality improver is a sizing agent, a rosin emulsion type, an alkyl ketene dimer type, an alkenyl succinic anhydride type, a styrene type polymer or the like commonly used in the papermaking field can be used as the sizing agent. It is not limited to. At least one of these is added to the previous adhesive and mixed uniformly. In this case, the weight ratio of the sizing agent to the adhesive is preferably in the range of 30 to 75%. When the weight ratio of the sizing agent to the adhesive is less than 30%, it is difficult to improve the effect of the present invention, that is, the difficulty of tearing the toilet roll sanitary paper accompanying the use of the sizing agent. On the other hand, when the weight ratio of the sizing agent to the adhesive exceeds 75%, the joining strength between the two sheets is insufficient and the sheets are easily separated.

  When the paper quality improving agent includes a sizing agent, the weight ratio of the sizing agent to the pulp component contained in the paper stock for papermaking is preferably in the range of 0.1 to 1%. When the weight ratio of the sizing agent to the pulp component contained in the paper stock is less than 0.1%, it is hardly expected to improve the difficulty of tearing the toilet roll sanitary paper accompanying the use of the sizing agent. On the contrary, if the weight ratio of the sizing agent to the pulp component contained in the stock exceeds 1%, the water disintegration property of the toilet roll sanitary paper is impaired.

  In addition, when adding a moisturizer and a sizing agent to the adhesive as a paper quality improver, the ratio of the adhesive, the humectant and the sizing agent is set in a range of 4: 3: 3 to 6: 2: 2 by weight ratio. It is preferable to do.

  An embossed pattern is formed on the sheet exposed on the surface side of the toilet roll sanitary paper, and the adhesive may further contain a colorant. In this case, an aqueous dye or the like can be generally employed as the colorant, but may be an aqueous pigment and is not limited thereto.

  Embossing is performed on the sheet exposed on the back side of the toilet roll sanitary paper, and convex portions by this embossing can be formed at predetermined intervals throughout the sheet.

  In the case of sanitary paper for toilet rolls in which three or more sheets are stacked on top of each other, the sheet that is not exposed on the front or back side of the sanitary paper is embossed, and the embossed protrusions are projected over the entire area of the sheet. May be formed at predetermined intervals.

  The sheet exposed on the back side of the toilet roll sanitary paper is embossed, and the density of the convex portions on the center side of the sheet can be set higher than the density of the convex portions on the edge of the sheet.

  In the case of sanitary paper for toilet rolls in which three or more sheets are stacked on top of each other, the sheet that is not exposed on either the front side or the back side is embossed, and the density of the protrusions at the edge of this sheet Also, the density of the convex portions on the center side of the sheet can be set high.

  The sheet may have water decomposability.

  A second aspect of the present invention is a method for manufacturing the toilet roll sanitary paper according to the first aspect of the present invention described above, and a paper quality improver is previously added to an adhesive for joining a plurality of sheets. Are formed on the one sheet by the step of embossing, the step of embossing at least one of the two adjacent sheets of the plurality of sheets, and the step of embossing A step of applying an adhesive containing a paper quality improving agent to the top surface of the convex portion projecting to the other sheet side, and superposing the other sheet on one sheet coated with the adhesive and joining them together It is characterized by comprising steps.

  According to the present invention, since the paper quality improving agent is included in the adhesive applied to the top surface of the convex portion formed on one sheet by embossing, the paper quality of the resulting toilet roll sanitary paper can be set as desired. Can be improved.

  In particular, when the paper quality improving agent contains a moisturizing agent, the deterioration of the texture of the toilet roll sanitary paper accompanying the use of the adhesive is suppressed, and the flexibility thereof can be kept good. Further, the moisturizing agent is sandwiched between the two sheets, and the moisturizing effect can be maintained over a relatively long period. Moreover, when the weight ratio of the humectant to the adhesive is set within a range of 30 to 70%, the above-described effects of the present invention can be obtained more reliably. Moreover, when the design by embossing is formed in one sheet | seat, the appearance of a design can be improved because an adhesive agent further contains a coloring agent. Moreover, when the convex part by embossing is formed in the whole area | region of one sheet | seat at predetermined intervals, two sheets can be joined strongly, maintaining the uniformity of a texture.

  On the other hand, when the paper quality improving agent includes a sizing agent, the use of the sizing agent can be suppressed as compared with the conventional one. Further, when the density of the convex portions at the center side of the sheet is set higher than the density of the convex portions at the edge portion of the sheet, it is possible to increase the difficulty of tearing at the central portion of the sheet as compared with the edge portion of the sheet. . In addition, by setting the weight ratio of the sizing agent to the pulp component contained in the paper stock for papermaking within the range of 0.1 to 1%, it is difficult to break without impairing the water disintegration property of the toilet roll sanitary paper. Can be improved. Moreover, the use of the sizing agent can be minimized by setting the weight ratio of the sizing agent to the adhesive within a range of 30 to 75%.

FIG. 1 is a three-dimensional projection view showing an appearance of an embodiment in which sanitary paper according to the present invention is applied to a toilet roll of two sheets. FIG. 2 is a cross-sectional view schematically showing the structure of the toilet roll shown in FIG. FIG. 3 is a conceptual diagram schematically showing the toilet roll manufacturing facility shown in FIG. 1. FIG. 4 is a conceptual diagram obtained by extracting and enlarging the embossed portion in the manufacturing facility shown in FIG. FIG. 5 is a conceptual diagram in which an adhesive application portion in the embossed portion is further extracted and enlarged. FIG. 6 is a cross-sectional view schematically showing the structure of one embodiment of a sanitary sheet of three sheets. FIG. 7 is a conceptual diagram in which the embossed portion for manufacturing the sanitary paper shown in FIG. 6 is extracted and enlarged. FIG. 8 is a cross-sectional view schematically showing the structure of another embodiment of a sanitary sheet of three sheets. FIG. 9 is a three-dimensional projection view showing the appearance of another embodiment in which the sanitary paper according to the present invention is applied to a toilet roll of two sheets. FIG. 10 is a cross-sectional view schematically showing the structure of the toilet roll shown in FIG. FIG. 11 is a cross-sectional view schematically showing the structure of another embodiment of a sanitary sheet of three sheets. FIG. 12 is a cross-sectional view schematically showing the structure of another embodiment of the sanitary paper with three sheets.

  An embodiment in which two sanitary paper sheets according to the present invention are applied to a double-type toilet roll will be described in detail with reference to FIGS. However, the present invention is not limited to such an embodiment, and can also be applied to other sanitary sheets in which a plurality of sheets are stacked, such as a non-water-decomposable kitchen roll.

  The appearance of an embodiment of a toilet roll that is the subject of the present invention is shown in FIG. The toilet roll 10 in the present embodiment is obtained by winding a laminated continuous sheet 13 in which a front surface tissue 11 and a back surface tissue 12 are overlapped on a cylindrical core 14 for a predetermined length.

  A large number of first embossed portions 11a as convex portions in the present invention projecting on the side of the surface that overlaps with the back surface tissue 12 are formed on the front surface tissue 11 so as to constitute any desired design as shown in FIG. Has been. Similarly, on the back surface tissue 12, a large number of second embossed portions 12a are formed at predetermined intervals in an aligned state so as to protrude toward the side of the surface that overlaps the front surface tissue 11. As described above, the first embossed portion 11a and the second embossed portion 12a are protruded to the overlapping surface side of the front surface tissue 11 and the rear surface tissue 12, so that the surface texture of the front surface tissue 11 and the rear surface tissue 12 is good. Can be kept in. As the patterns of the first embossed portion 11a and the second embossed portion 12a formed on the front surface tissue 11 and the back surface tissue 12, those having an arbitrary pattern other than those illustrated can be adopted as necessary.

  The top surface of the first embossed portion 11a of the surface tissue 11 is coated with an adhesive 15 to which a moisturizing agent and a colorant are added in a predetermined ratio in advance, and thereby the back surface tissue 12 in contact with the top surface of the first embossed portion 11a. The top surface of the second embossed portion 12a is joined. As is apparent from FIG. 2 schematically showing the cross-sectional structure of the laminated continuous sheet 13, not all of the top surfaces of the first embossed portions 11 a are in contact with the top surfaces of the second embossed portions 12 a of the back surface tissue 12. However, the contact portion between the top surface of the first embossed portion 11a and the top surface of the second embossed portion 12a is joined via the adhesive 15, and it is possible to prevent the surface tissue 11 and the back surface tissue 12 from peeling off. Become. In this case, by setting the area where the top surface of the first embossed portion 11a and the top surface of the second embossed portion 12a are actually in contact with the unit area of the laminated continuous sheet 13 is about 2 to 3%. 11 and backside tissue 12 can be prevented from peeling off. Therefore, when the pattern is formed by the first embossed portion 11a, the size of the first embossed portion 11a and the second embossed portion 12a is such that the contact area between the top surface and the back surface tissue 12 is about 2-3%. It is desirable to set the interval appropriately.

  Since this adhesive 15 contains 30 to 70% of a moisturizing agent in a weight ratio with respect to the adhesive, the moisturizing agent can prevent a decrease in the texture of the laminated continuous sheet 13 due to the solidification of the adhesive 15. . In particular, since the moisturizing agent is interposed between the front surface tissue 11 and the back surface tissue 12, the moisturizing effect on the laminated continuous sheet 13 can be maintained over a relatively long period of time. Moreover, since the first embossed portion 11a to which the adhesive 15 is applied defines the pattern of the surface tissue 11, the pattern can be clearly raised by the colorant contained in the adhesive 15, and the merchantability Can be increased.

  A manufacturing facility for such a toilet roll 10 is schematically shown in FIG. An original fabric surface tissue roll 11R and an original fabric reverse surface tissue roll 12R are arranged on the original fabric tissue stand 20, and these original fabric tissue rolls 11R, 12R are two to two times the width of the toilet roll 10 as a product. It has a width of a dozen times. The long strips 11L and 12L formed in a strip shape drawn from the original fabric surface tissue roll 11R and the original fabric reverse surface tissue roll 12R are sent to an embossing section 21 disposed adjacent to the original fabric tissue stand 20. On the downstream side of the embossing part 21, a winding part 22 and a terminal processing part 23 are arranged in this order. The embossing part 21 embosses the raw fabric rolls 11R and 12R, respectively. At the same time, the adhesive 15 is applied to the top surface of the first embossed portion 11a of the raw tissue roll 11R to integrally join the second raw tissue roll 12R, thereby obtaining a long laminated continuous sheet 13L. The winding unit 22 cuts the long laminated continuous sheet 13L fed from the embossing unit 21 into a long toilet roll 10L by cutting the continuous laminated sheet 13L every predetermined length and winding it around a long winding core. In the present embodiment, prior to the cutting of the long laminated continuous sheet 13L in the winding unit 22, the perforation for breaking across the width direction is formed at regular intervals along the longitudinal direction of the long laminated continuous sheet 13L. Like to do. The end processing unit 23 glues the end of the long toilet roll 10L discharged from the winding unit 22 to the surface thereof so that the long toilet roll 10L does not unwind. In addition, the long toilet roll 10L is carried out to the cutting part which is not shown in figure, and is cut | disconnected by the predetermined width, and becomes the individual toilet roll 10. FIG. The tip of the long laminated continuous sheet 13L remaining after cutting is wound around a new long core disposed in the winding unit 22, and the predetermined length of the laminated continuous sheet 13L is again applied to the long core. It is designed to be wound up.

  The embossed part 21 in this embodiment is extracted and enlarged and shown in FIG. 4, and the main part is further extracted and enlarged and shown in FIG. That is, an embossing roll 31 for front surface tissue and an embossing roll 32 for back surface tissue are arranged on the frame 30 of the embossed portion 21 so as to be spaced apart from each other. On the outer peripheral surface of the first embossing roll 31 for surface tissue, the embossed pattern of the first embossed portion 11a shown in FIG. Similarly, unevenness corresponding to the emboss pattern of the second embossed portion 12 a shown in FIGS. 1 and 2 is formed on the outer peripheral surface of the backside tissue embossing roll 32.

  On the side of the embossing roll 31 for the surface tissue, a well-known adhesive applicator 33 for applying the adhesive 15 to the top surface of the first embossed portion 11a formed on the long tissue 11L by the embossing roll 31. Is arranged. The adhesive applicator 33 has a tank 33a for storing an adhesive 15 in which a moisturizing agent and a colorant are uniformly mixed in a predetermined ratio in advance, and an application for applying the adhesive 15 stored in the tank 33a. And a roll 33b. The application roll 33b rotates synchronously with the embossing roll 31, and the adhesive 15 having a predetermined film thickness is applied to the top surface of the first embossed portion 11a.

  A backup roll 34 for the front surface tissue is movably disposed immediately above the embossing roll 31 for the front surface tissue, and a backup roll 35 for the rear surface tissue is disposed immediately below the embossing roll 32 for the rear surface tissue. The surface portions of the backup rolls 34 and 35 are formed of a hard rubber-like elastic body such as elastically deformable hard synthetic rubber, but at least the uneven portions of the embossing rolls 31 and 32 are formed of metal. Yes. The backup rolls 34 and 35 are rotatably attached to roll holders 38 and 39 whose base end portions are swingably attached to the frame 30 around pivots 36 and 37, respectively. The end portions of the roll holders 38 and 39 are respectively pinned to the other end portions of the fluid pressure cylinders 40 and 41 whose one ends are pinned to the frame 30.

  The fluid pressure cylinder 40 connected to the roll holder 38 that supports the backup roll 34 for the surface tissue is used to keep the pressing pressure of the backup roll 34 for the surface tissue against the embossing roll 31 for the surface tissue constant. is there. Similarly, the fluid pressure cylinder 41 connected to the roll holder 39 that supports the backside tissue backup roll 35 holds the pressing pressure of the backside tissue backup roll 35 against the backside tissue embossing roll 32 constant. belongs to.

  Above the joining roll 42, a tension adjusting roll 43 for removing the slack of the long laminated continuous sheet 13L drawn from the embossing section 21 to the winding section 22 is disposed. A base end portion of a slack eliminating arm 44 that rotatably supports the tension adjusting roll 43 is rotatably attached to the frame 30 via a pivot 45.

  The rotation axes of the rolls 31, 32, 33b, 34, 35, 42, 43 and the pivots 36, 37, 45 described above are set parallel to each other. The embossing rolls 31 and 32, the coating roll 33b, and the joining roll 42 are connected to a roll driving means (not shown) for synchronously driving and rotating them. The remaining backup rolls 34, 35 and the like are driven to rotate by the frictional force accompanying the conveyance of the raw tissue rolls 11R, 12R.

  Therefore, the long tissue 11L, 12L in the form of a strip drawn from the original fabric surface tissue roll 11R and the original fabric reverse surface tissue roll 12R is embossed by the embossing portion 21, and the first and second embossed portions are respectively provided. 11a and 12a are formed. Thereby, tension and flexibility are given to the long tissues 11L and 12L. At the same time, the adhesive 15 is applied to the top surface of the first embossed portion 11a, and the long tissues 11L and 12L are laminated and integrally joined by the adhesive 15 while passing through the joining roll 42. .

  In addition, when the 1st embossed part 11a of the surface tissue 11 does not comprise a special pattern, or when it is not necessary to color this part, it is not necessary to add a coloring agent to the adhesive agent 15. That is, you may make it apply | coat to the top surface of the 2nd embossing part 12a of the back surface tissue 12 the adhesive agent which contains a moisturizing agent but does not contain a coloring agent.

  In the above-described embodiment, the toilet roll 10 having two sheets is described. However, the present invention can be applied to sanitary paper in which three or more sheets are overlapped, and an example of the sectional structure of such sanitary paper. Is shown in FIG.

  The sanitary paper 10 according to this embodiment has a three-sheet configuration in which an intermediate tissue 16 is interposed between the front surface tissue 11 and the back surface tissue 12. The front surface tissue 11 and the intermediate tissue 16 have the same configuration as the front surface tissue 11 and the back surface tissue 12 in the previous embodiment. The surface tissue 11 and the intermediate tissue 16 are joined to each other by an adhesive 15 applied to the top surface of the first embossed portion 11a, and this adhesive 15 contains a humectant and a colorant as in the previous embodiment. It may be. In this embodiment, since embossing is performed on all three tissues 11, 12, and 16, the texture of the obtained sanitary paper 10 can be further improved.

  In the back surface tissue 12 in the present embodiment, a second embossed portion 12a having the same shape as the third embossed portion 16a of the intermediate tissue 16 is formed, and a transparent adhesive 17 applied to the top surface of the second embossed portion 12a. The back surface tissue 12 and the intermediate tissue 16 are joined to each other. Since the transparent adhesive 17 in the present embodiment also includes a moisturizing agent of 30 to 70% by weight with respect to the adhesive, a decrease in the texture of the sanitary paper 10 due to the solidification of the adhesive 17 is caused by the moisturizing agent. Can be blocked. In particular, since the moisturizing agent is interposed between the intermediate tissue 16 and the back surface tissue 12, the moisturizing effect on the sanitary paper 10 can be maintained for a relatively long period of time. Moreover, by making the adhesive 17 transparent, there is a problem that the visual effect of the colorant contained in the adhesive 15 applied to the first embossed portion 11a that defines the pattern of the surface tissue 11 is impaired. Can be prevented in advance. Thereby, the merchantability of the sanitary paper 10 can be further enhanced.

  As in the previous embodiment, not all of the top surface of the second embossed portion 12 a contacts the back surface of the intermediate tissue 16. However, the contact portion between the top surface of the second embossed portion 12a and the back surface of the intermediate tissue 16 is joined via the adhesive 17, so that the intermediate tissue 16 and the back surface tissue 12 can be prevented from peeling off. In this case, by setting the area where the top surface of the second embossed portion 12a and the back surface of the intermediate tissue 16 are actually in contact with each unit area of the sanitary paper 10 to about 2-3%, the intermediate tissue 16 and the back surface tissue are set. 12 can be prevented from peeling off. The size and spacing of the third embossed portion 16a and the second embossed portion 12a are appropriately set so that the contact area between the back surface of the intermediate tissue 16 and the top surface of the second embossed portion 12a is about 2-3%. It is desirable to keep it.

  FIG. 7 shows a schematic structure of an embossed portion for manufacturing such a sanitary paper 10 of three sheets. Elements having the same functions as those of the previous embodiment are denoted by the same reference numerals, and description thereof is given. Omitted. That is, the embossing part 21 in this embodiment is further provided with a set including an embossing roll 46 for intermediate tissue and an adhesive application device 47 for the transparent adhesive 17 compared to the previous embodiment. Yes.

  A backup roll 48 for intermediate tissue is movably disposed immediately above the embossing roll 46 for intermediate tissue. The surface portion of the backup roll 48 is formed of a hard rubber-like elastic body such as elastically deformable hard synthetic rubber, but at least the uneven portion of the embossing roll 46 is formed of metal. The backup roll 48 is rotatably attached to a roll holder 50 whose base end portion is swingably attached to the frame 30 about a pivot 49. The tip of the roll holder 50 is pinned to the other end of a fluid pressure cylinder 51 whose one end is pinned to the frame 30. A fluid pressure cylinder 51 connected to a roll holder 50 that supports the intermediate tissue backup roll 48 is used to maintain a constant pressing pressure of the intermediate tissue backup roll 48 against the intermediate tissue embossing roll 46. is there.

  On the side of the embossing roll 32 for the backside tissue, a known adhesive applicator for applying the transparent adhesive 17 to the top surface of the second embossed portion 12a formed on the long tissue 12L by the embossing roll 32. 47 is arranged. The adhesive application device 47 includes a tank 47a for storing the adhesive 17 in which a moisturizing agent is uniformly mixed in a predetermined ratio in advance, and an application roll 47b for applying the adhesive 17 stored in the tank 47a. Have The coating roll 47b rotates in synchronization with the embossing roll 32, and the adhesive 17 having a predetermined film thickness is applied to the top surface of the second embossed portion 12a.

  The intermediate tissue 16 can be used in a flat state without being embossed. Such a cross-sectional structure of another embodiment of the present invention is shown in FIG. 8, and the same reference numerals are given to elements having the same functions as those of the previous embodiment. When the intermediate tissue 16 is bonded to the front surface tissue 11 and the back surface tissue 12 in a flat state as in the present embodiment, all of the adhesives 15 and 17 are used for bonding to the intermediate tissue 16, and as a result, the sanitary paper 10 The peel strength of can be greatly increased.

  In the above-described embodiment, the paper quality improving agent including a moisturizing agent has been described. However, the paper quality improving agent may include a sizing agent. The appearance of another embodiment of the sanitary paper according to the present invention is shown in FIG. 9, but the same reference numerals are given to the elements having the same functions as those of the previous embodiment, and the overlapping description is omitted.

  In the front surface tissue 11 of the sanitary paper 10 in the present embodiment, a large number of first embossed portions 11a projecting on the side of the overlapping surface with the back surface tissue 12 constitute any desired design as shown in FIG. Is formed. Similarly, a large number of second embossed portions 12 a are randomly formed on the back surface tissue 12 so as to protrude toward the surface that overlaps the front surface tissue 11. In the present embodiment, the density of the second embossed portion 12 a is set so as to be higher toward the center side than the edge in the width direction of the back surface tissue 12. As described above, the first embossed portion 11a and the second embossed portion 12a are protruded to the overlapping surface side of the front surface tissue 11 and the rear surface tissue 12, so that the surface texture of the front surface tissue 11 and the rear surface tissue 12 is good. Can be kept in. As the patterns of the first embossed portion 11a and the second embossed portion 12a formed on the front surface tissue 11 and the back surface tissue 12, those having an arbitrary pattern other than those illustrated can be adopted as necessary.

  The top surface of the second embossed portion 12a of the back surface tissue 12 is coated with an adhesive 15 in which a sizing agent is added in advance at a predetermined ratio together with a moisturizing agent, whereby the surface tissue 11 in contact with the top surface of the second embossed portion 12a. The top surface of the first embossed portion 11a is joined. As is apparent from FIG. 10 schematically showing the cross-sectional structure of the laminated continuous sheet 13, not all of the top surfaces of the second embossed portions 12 a are in contact with the top surfaces of the first embossed portions 11 a of the surface tissue 11. However, the contact portion between the top surface of the first embossed portion 11a and the top surface of the second embossed portion 12a is joined via the adhesive 15, and it is possible to prevent the surface tissue 11 and the back surface tissue 12 from peeling off. Become. In this case, by setting the area where the top surface of the first embossed portion 11a and the top surface of the second embossed portion 12a are actually in contact with the unit area of the laminated continuous sheet 13 is about 2 to 3%. 11 and backside tissue 12 can be prevented from peeling off. Therefore, when the pattern is formed by the first embossed portion 11a, the size of the first embossed portion 11a and the second embossed portion 12a is such that the contact area between the top surface and the back surface tissue 12 is about 2-3%. It is desirable to set the interval appropriately. In this embodiment, since the density of the 2nd embossed part 12a is set so that the center part side is higher than the edge part of the width direction of the back surface tissue 12, there is much sizing agent toward the width direction center part side of the lamination | stacking continuous sheet 13. It will be arranged, and it is possible to improve the difficulty of breaking. In this case, the lowering of the texture due to the adhesive is alleviated by the moisturizing agent, and the moisturizing agent is interposed between the front surface tissue 11 and the rear surface tissue 12, and therefore, for a relatively long period of time. Thus, the moisturizing effect on the laminated continuous sheet 13 can be maintained.

  Instead of the adhesive 15 containing a humectant and a sizing agent, it is also possible to join the surface tissue 11 and the backside tissue 12 using an adhesive that does not contain a humectant but contains a sizing agent.

  In contrast to the above-described embodiment, three or more sheets can be overlapped, and an example of the cross-sectional structure of the sanitary paper according to the present invention is shown in FIGS. 11 and 12. Elements having the same function are denoted by the same reference numerals, and redundant description is omitted.

  The sanitary paper 10 in the present embodiment shown in FIG. 11 has a three-sheet configuration in which an intermediate tissue 16 is interposed between the front surface tissue 11 and the back surface tissue 12. The front surface tissue 11 and the intermediate tissue 16 have the same configuration as the front surface tissue 11 and the back surface tissue 12 in the embodiment shown in FIG. The intermediate tissue 16 is joined to the surface tissue 11 via the adhesive 15 applied to the top surface of the first embossed portion 11a. In this embodiment, since embossing is performed on all three tissues 11, 12, and 16, the texture of the resulting sanitary paper 10 can be further improved.

  In the back surface tissue 12 in this embodiment, a second embossed portion 12a having the same shape as the third embossed portion 16a of the intermediate tissue 16 is formed, and an adhesive 15 applied to the top surface of the second embossed portion 12a is interposed therebetween. Then, the back surface tissue 12 and the intermediate tissue 16 are joined. As in the previous embodiment, not all of the top surface of the second embossed portion 12 a contacts the back surface of the intermediate tissue 16. However, the contact portion between the top surface of the second embossed portion 12a and the back surface of the intermediate tissue 16 is joined via the adhesive 17, so that the intermediate tissue 16 and the back surface tissue 12 can be prevented from peeling off.

  In FIG. 12, the intermediate tissue 16 is used without being embossed and in a flat state. When the intermediate tissue 16 is bonded to the front surface tissue 11 and the back surface tissue 12 in a flat state as in the present embodiment, all of the adhesive 15 is used for bonding to the intermediate tissue 16, and as a result, the sanitary paper 10 is peeled off. The strength can be greatly increased.

  It should be noted that the present invention should be construed only from the matters described in the scope of claims, and in the above-described embodiment, all the changes and modifications included in the concept of the present invention are possible other than the items described. It is. That is, all matters in the above-described embodiment are not intended to limit the present invention, and include any configuration not directly related to the present invention. To get.

DESCRIPTION OF SYMBOLS 10 Toilet roll 11 Surface tissue 11a 1st embossed part 12 Back surface tissue 12a 2nd embossed part 14 Roll core 15 Adhesive 16 Intermediate tissue 16a 3rd embossed part 17 (Transparent) Adhesive 21 Embossed part 31, 32 Embossed roll 33 Bonded Agent coating device 34, 35 Backup roll 42 Bonding roll 46 Embossing roll 47 Adhesive coating device 48 Backup roll

Claims (16)

A toilet roll sanitary paper in which a plurality of sheets are superposed on each other, and at least one of the two adjacent sheets among the plurality of sheets is embossed, adhesive for bonding the other sheet on the top surface of the protrusion protruding said formed on one sheet to the other of the sheet side is applied, the adhesive is observed including a paper quality improving agent,
The sheet exposed on the back side of the toilet roll sanitary paper is embossed, and the density of the projections at the center side of the sheet is set higher than the density of the projections at the edge of the sheet. Sanitary paper for toilet rolls, characterized in that The toilet roll sanitary paper in which three or more sheets are overlapped with each other, and the sheet that is not exposed on the front side or the back side is embossed, and the density of the convex portions at the edge of this sheet The density of the convex part on the center side of the sheet is set higher than that, and an adhesive for joining another sheet is applied to the top surface of the convex part, and this adhesive contains a paper quality improving agent. Sanitary paper for toilet rolls. Toilet rolls for sanitary paper according to claim 1 or 2, characterized in that it comprises at least one of the paper quality improving agent humectants and sizing agents. The sanitary paper for toilet rolls according to claim 3 , wherein when the paper quality improving agent contains a humectant, the weight ratio of the humectant to the adhesive is in the range of 30 to 70%. The sanitary paper for toilet rolls according to claim 3 , wherein when the paper quality improving agent contains a sizing agent, the weight ratio of the sizing agent to the adhesive is in the range of 30 to 75%. If the paper quality improving agent comprising a sizing agent, wherein the claim 3 the weight ratio of the sizing agent for pulp component contained in the paper stock for papermaking, characterized in that the in the range of 0.1 to 1% The sanitary paper for toilet rolls in any one of claim | item 5 . The toilet roll sanitary paper according to any one of claims 1 to 6 , wherein a pattern exposed by embossing is formed on a sheet exposed on the surface side of the sanitary paper, and the adhesive further includes a colorant. . The toilet roll according to claim 2 , wherein the sheet exposed on the back side of the toilet roll sanitary paper is embossed, and convex portions formed by the embossing are formed at predetermined intervals throughout the sheet. Sanitary paper. Toilet roll sanitary paper in which three or more sheets are stacked on top of each other, and the embossing is applied to the sheet that is not exposed on the front side or back side of the toilet roll sanitary paper. The toilet roll sanitary paper according to claim 1 , wherein the sheet is formed at predetermined intervals over the entire sheet. The sanitary paper for toilet rolls according to any one of claims 1 to 9 , wherein the sheet has water decomposability. A method for producing the toilet roll sanitary paper according to claim 1 ,
A step of preliminarily including a paper quality improving agent in an adhesive for joining a plurality of sheets;
Embossing at least one of the two adjacent sheets of the plurality of sheets;
Applying an adhesive containing a paper quality improving agent on the top surface of the convex portion formed on the one sheet and projecting to the other sheet side by the embossing step;
A method for producing sanitary paper for toilet rolls, comprising: superposing one sheet on one sheet coated with an adhesive and joining the other sheet. A method for producing the toilet roll sanitary paper according to claim 2, wherein a paper quality improving agent is previously included in an adhesive for joining three or more sheets;
  Embossing a sheet that is not exposed on either the front side or the back side;
  Applying an adhesive containing a paper quality improving agent on the top surface of the embossed convex portion by performing the embossing;
  A step of superimposing another sheet on one sheet coated with adhesive and bonding them together
  A method for producing sanitary paper for toilet rolls, comprising: The method for producing sanitary paper for toilet rolls according to claim 11 or 12 , wherein the paper quality improving agent contains at least one of a humectant and a sizing agent.   When the paper quality improving agent contains a humectant, the weight ratio of the humectant to the adhesive is in the range of 30 to 70%.   The method for producing sanitary paper for toilet rolls according to claim 13, wherein when the paper quality improving agent contains a sizing agent, the weight ratio of the sizing agent to the adhesive is in the range of 30 to 75%.   When the paper quality improving agent contains a sizing agent, the weight ratio of the sizing agent to the pulp component contained in the paper stock for papermaking is in the range of 0.1 to 1%. The manufacturing method of the sanitary paper for toilet rolls in any one of.

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