JP2012040775A - Method for producing rolled sanitary paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing rolled sanitary paper, which is configured to obtain the rolled sanitary paper that is hardly distorted in the rolled-up shape even when a designed embossment is formed and that has an excellent beautiful appearance and a regular shape, and which can be carried out by using simple and compact facilities.SOLUTION: In the method for producing rolled sanitary paper, an embossing roll 50, in which convex pattern rows 54 obtained by repeatedly arranging convex patterns 52 having the same shape are formed and the convex pattern rows 54 is arranged on the outer peripheral surface 56 of the roll so as to draw spiral curves C using an axis line A of the roll as a central axis line, is used. The embossing roll 50 is pressed to long base paper in a state where the embossing roll 50 is arranged so that the axis line A of the roll is perpendicular to the feeding direction of the long base paper. Thereby obtaining the long sanitary paper in which a plurality of designed embossments corresponding to the convex patterns 52 is formed on the long base paper, to roll up the long sanitary paper in a rolled shape in the method for producing rolled sanitary paper.

Description

  The present invention relates to a method for producing rolled sanitary paper such as toilet paper and kitchen towels. More specifically, the present invention relates to a method for manufacturing a roll-like sanitary paper having a process of embossing a base paper for the purpose of imparting design properties to the sanitary paper.

  For roll-like sanitary paper such as toilet paper and kitchen towels, embossing is sometimes performed to form fine dot-like embosses uniformly on the entire paper for the purpose of improving the flexibility of the paper. ").

  In addition, for the purpose of improving the design of sanitary paper and increasing the commercial value, it is not the fine dot-shaped embossing as described above, but embossing with a large top area representing a decorative pattern or figure (“design embossing”). (See, for example, Patent Documents 1 to 10). The design embossing as described above is formed by pressing (embossing) the embossing roll against the base paper of the sanitary paper, using an embossing roll having a plurality of convex patterns corresponding to the design embossing formed on the roll surface. can do.

JP-A-4-59347 Special Table 2002-505207 Japanese Patent Laid-Open No. 2003-116741 JP 2005-168582 A JP-T-2006-513068 JP 2006-183216 A JP 2006-204570 A JP 2007-61510 A JP 2007-68777 A JP 2008-1113695 A

  By the way, the micro embossing is uniformly formed on the entire sanitary paper due to the property of imparting flexibility to the sanitary paper, whereas the design embossing is locally formed on a part of the paper for the purpose of decoration. . Therefore, the design emboss formation part of the sanitary paper protrudes greatly locally or is greatly recessed.

  However, when the long sanitary paper on which the design embossing is formed as described above is taken up and rolled up, the design embossing formation part is superimposed several times, so that it protrudes greatly in the roll outer peripheral direction (or in the roll center direction). There was a problem that the rolled shape of the roll-like sanitary paper became distorted. Such a problem is not preferable because it not only impairs the beauty of the roll-like sanitary paper but also makes it difficult to wrap the roll-like sanitary paper.

  The present invention has been made in view of the above-described problems of the prior art, and even when design embossing is formed, a rolled sanitary paper having an excellent aesthetic appearance and a well-formed roll shape is obtained. And a method for producing a roll-like sanitary paper that can be implemented with simple and compact equipment.

  As a result of intensive studies to solve the above problems, the present inventor has formed a convex pattern row in which convex patterns of the same shape are repeatedly arranged as an embossing roll for forming design embossing, and the convex pattern row of the roll By using an embossing roll arranged on the outer peripheral surface of the roll so as to draw a spiral curve with the axis as the central axis, it has been found that the rolled shape of the roll-like sanitary paper can be improved, and the present invention has been completed. It was. That is, according to this invention, the manufacturing method of the roll-shaped sanitary paper shown below is provided.

[1] An embossing roll formed on the outer peripheral surface of the roll so that a convex pattern row is formed by repeatedly arranging convex patterns of the same shape, and the convex pattern row draws a spiral curve with the axis of the roll as the central axis. The embossing roll is pressed against the long base paper in a state where its axial direction is arranged so as to be orthogonal to the feeding direction of the long base paper. A method for producing a roll-like sanitary paper, in which a long sanitary paper having a plurality of corresponding design embosses is obtained and the long sanitary paper is wound into a roll.

[2] The method for producing a roll-like sanitary paper according to [1], wherein a concentric convex pattern is repeatedly arranged as the embossing roll.

[3] The method for producing a roll-like sanitary paper according to [1] or [2], wherein the embossing roll is one in which dot-shaped convex portions having the same shape are collectively arranged to form the convex pattern.

[4] In the above [3], as the embossing roll, one in which convex patterns adjacent in the column direction of the convex pattern row share part of the dot-shaped convex portions to form the convex pattern. The manufacturing method of the roll-shaped sanitary paper of description.

[5] As the embossing roll, one in which convex patterns adjacent to each other in a direction intersecting the row direction of the convex pattern row share a part of the dot-shaped convex portions to form the convex pattern is used. The method for producing a roll-like sanitary paper according to [3] or [4].

  The manufacturing method of the present invention can be performed with a simple and compact manufacturing facility while providing a roll-shaped sanitary paper having an excellent aesthetic appearance and a well-formed shape, even when design embossing is formed. it can.

It is a schematic perspective view which shows typically the one side surface vicinity of the embossing roll used with the manufacturing method of this invention. It is a general | schematic expansion | deployment figure which shows typically the state which expand | deployed planarly the roll surface of the embossing roll shown to FIG. 1A. It is a general | schematic expanded view which expands and shows a part of roll surface shown in FIG. 1B further. It is a schematic perspective view which shows typically the roll-shaped sanitary paper obtained by the manufacturing method of this invention. It is explanatory drawing which shows typically one Embodiment of the manufacturing method of this invention. It is explanatory drawing which shows typically another embodiment of the manufacturing method of this invention.

  Hereinafter, embodiments for carrying out the manufacturing method of the present invention will be specifically described with reference to the drawings. However, the present invention broadly encompasses manufacturing methods having the invention-specific matters, and is not limited to the following embodiments. 1A and 1B illustrate the vicinity of the side surface 60 of the embossing roll 50, and in FIG. 1A, a rotating shaft 62 that rotates the embossing roll 50 is illustrated.

[1] Definitions etc .:
In this specification, “emboss” means an embossed pattern formed by pressing a convex pattern on the outer peripheral surface of an embossing roll, and the term “emboss” includes not only design emboss but also micro emboss described later. .

  In addition, the “long sanitary paper” referred to in this specification includes one-ply sanitary paper composed of a single-layer long sanitary paper, and two long sanitary sanitary papers such as the roll sanitary paper 1 shown in FIG. Multi-ply sanitary paper such as two-ply sanitary paper that is a set of two sheets of paper 2A and three-ply sanitary paper that is a set of three long sanitary papers is also included.

  In the case of the multi-ply sanitary paper, among a plurality of long sanitary papers in one set, the paper that will constitute the roll outermost layer later is the “outermost paper”, and later the layers other than the roll outermost layer. The sheets constituting the sheet (that is, all sheets other than the outermost layer sheet) are referred to as “inner layer sheets”. In addition, in this specification, for convenience of explanation, a paper that is a raw material for a long sanitary paper, and is in a state before all the embosses (design emboss, micro emboss, etc.) are formed, Of these, the long base paper that will later become the “outermost layer paper” will be referred to as the “outermost layer paper base”, and the long base paper that will subsequently become the “inner layer paper” will be referred to as the “inner layer paper base paper”. .

[2] Features of the production method of the present invention:
In the manufacturing method of the present invention, as shown in FIGS. 1A to 1C, a convex pattern row 54 is formed by repeatedly arranging convex patterns 52 having the same shape, and the convex pattern row 54 has the axis A of the roll as the central axis. Using an embossing roll 50 arranged on the outer peripheral surface 56 of the roll so as to draw a spiral curve C, the embossing roll 50 is arranged such that its axis A direction is orthogonal to the feeding direction D3 of the long base paper 70 as shown in FIG. 3A. In this state, by pressing against the long base paper 70, a long sanitary paper 2A in which a plurality of design embosses 12 corresponding to the convex pattern 52 is formed on the long base paper 70 is obtained. The sheet 2A is wound up in a roll shape.

  As shown in FIG. 1A to FIG. 1C, a convex pattern row is used by using an embossing roll 50 arranged on the outer peripheral surface 56 of the roll so that the convex row 54 draws a spiral curve C having the roll axis A as the central axis. The design emboss row corresponding to 54 is formed so as to be inclined with respect to the longitudinal direction of the long base paper (that is, the design emboss is gradually shifted in the width direction of the long base paper). Therefore, the protrusion or dent of the design emboss forming part is made uniform in the entire width direction of the long sanitary paper, and the roll shape of the roll sanitary paper becomes distorted when the long sanitary paper is rolled up. It can be effectively prevented.

  Moreover, when the embossing roll 50 having the structure shown in FIGS. 1A to 1C is used, the diameter of the embossing roll 50 can be reduced, and the design embossing inclined with respect to the longitudinal direction of the long base paper can be achieved with a compact facility. It becomes possible to form.

  As a method of forming the design embossing in an oblique direction with respect to the longitudinal direction of the long base paper without arranging the convex pattern row in a spiral shape, the peripheral diameter of the embossing roll corresponds to the winding length of the roll-like sanitary paper. A method of using an embossing roll in which a convex pattern row is formed in a range within one rotation with the circumference as the center axis and the roll axis as the central axis can be considered. However, such a method is not preferable because the embossing roll has a large diameter (about 19 mφ when the winding length is 60 m), which causes a problem that the manufacturing facility becomes remarkably large with respect to the size of the product to be manufactured (eg, 115 mmφ). .

  Further, as shown in FIG. 3A, a method of pressing the roll against the long base paper 70 in a state where the embossing roll 50 is arranged so that the axis A direction is orthogonal to the feeding direction D3 of the long base paper 70 is adopted. This also contributes to the downsizing of equipment.

  For example, using an embossing roll formed so that the convex pattern row is along the rotation direction of the roll, the embossing roll is pressed against the long base paper in a state where the embossing roll is disposed obliquely with respect to the feeding direction of the long base paper. Even in the method, the design emboss can be formed in an oblique direction with respect to the longitudinal direction of the long base paper. However, in such a method, the embossing roll is installed in an oblique direction with respect to the feed direction of the base paper, which causes a problem that the apparatus configuration becomes complicated and the installation space must be increased, which is not preferable.

[3] Characteristic configuration of the production method of the present invention:
The manufacturing method of this invention forms a design emboss using the embossing roll 50 which has a characteristic convex pattern pattern as shown to FIG. 1A-FIG. 1C.

“Design embossing” is embossing with a large top surface area representing a decorative pattern or figure formed for the purpose of improving the design of sanitary paper and increasing the commercial value. Specifically, 1) One motif (design as a repeating unit) is formed by a single emboss, and the top surface area of the emboss exceeds 2 mm ² alone. 2) Multiple embosses It is preferable that a single motif (design as a repeating unit) is formed by the arrangement of and the top surface area of the plurality of embossments exceeds 2 mm ² in total.

[3-1] Structure of embossing roll:
In the manufacturing method of the present invention, a convex pattern row 54 is formed in which convex patterns 52 having the same shape as shown in FIGS. 1A to 1C are repeatedly arranged, and the convex pattern row 54 has a roll axis A as a central axis. The embossing roll 50 arranged on the outer peripheral surface 56 of the roll so as to draw the spiral curve C is used.

  The “embossing roll” is a roll in which a convex pattern corresponding to the embossing formed on the long base paper is formed on the outer peripheral surface, and a metal roll is usually used.

  The “convex pattern” is a convex portion corresponding to the design emboss formed on the outer peripheral surface 56 of the embossing roll 50 like the convex pattern 52 shown in FIGS. 1A to 1C. In the present invention, one convex pattern corresponds to one motif (design as a repeating unit). The shape of the motif is not particularly limited. For example, a geometric pattern (circular shape, triangular shape, quadrangular shape, wave shape, etc.), the shape of a natural object (petal shape, leaf shape, etc.), etc. can be mentioned.

  Especially, as shown to FIG. 1A-FIG. 1C, it is preferable to make the convex pattern 52 into concentric form. When the circular convex pattern 52 comes into contact with the long base paper, the contact area of the convex pattern 52 gradually increases with the rotation of the embossing roll 50. Therefore, the long base paper can be reliably sent out, and it is possible to effectively suppress the problem that the long base paper is wrinkled or torn during embossing. Further, the concentric convex pattern 52 has a structure in which a small-diameter circular convex portion is arranged inside a large-diameter circular convex portion. Therefore, when the long base paper is fed out by a gap between both convex portions, Even if you hang around, you can buffer it. Accordingly, it is possible to enhance the effect of preventing a problem that the long base paper is wrinkled or torn during embossing.

  “Same shape” and “repetitive arrangement” mean that convex patterns based on the same motif are arranged so as to form a row continuously or intermittently. In the present specification, an assembly of a plurality of convex patterns repeatedly arranged in a row as described above is referred to as a “convex pattern row”. In the embossing roll 50 shown in FIGS. 1A to 1C, a plurality of concentric convex patterns 52 are connected to form a convex pattern row 54.

  In the production method of the present invention, 1) an embossing roll in which one convex pattern (motif) is formed by one convex portion may be used, or 2) a plurality of convex portions are collectively arranged to form one convex You may use the embossing roll in which the pattern (motif) is formed.

  In the form 2), the shape of each of the plurality of convex portions may be a dot shape, a line shape, or a shape in which these are integrally combined. However, in the manufacturing method of the present invention, it is preferable that dot-shaped convex portions having the same shape are collectively arranged to form one convex pattern. Such a form can reduce the variation in the contact pressure to the long base paper on which the emboss is formed. Accordingly, the feeding of the long base paper can be made uniform, and the problem that the long base paper is wrinkled or torn when passing through the embossing roll can be effectively suppressed.

The embossing roll 50 shown in FIGS. 1A to 1C is an example in which a plurality of dot-shaped convex portions 58 are arranged in a single array to form one concentric convex pattern 52. The “dot-shaped convex portion having the same shape” is preferably a circular dot-shaped convex portion having an area of 2 mm ² or less at the top surface.

  In the manufacturing method of the present invention, as the embossing roll, a) convex patterns adjacent to each other in the row direction of the convex pattern row share a part of the dot-shaped convex portions to form a convex pattern. B) It is preferable to use a pattern in which convex patterns adjacent to each other in a direction intersecting the column direction of the convex pattern row share a part of dot-shaped convex portions to form a convex pattern, and c) It is particularly preferable that both the forms of a) and b) are combined.

  The forms a) to c) are excellent in reducing the variation in contact pressure on the long base paper on which the emboss is formed. Accordingly, the feeding of the long base paper can be made uniform, and the problem that the long base paper is wrinkled or torn when passing through the embossing roll can be more effectively suppressed.

  The embossing roll 50 shown to FIG. 1A-FIG. 1C is an example of the embossing roll which has the structure of said c). As shown in FIG. 1C, in the embossing roll 50, a plurality of dot-shaped convex portions 58 form a concentric convex pattern 52, and a part of the dot-shaped convex portions 64 included inside the outermost peripheral circle of the concentric circle. Is shared by the convex patterns 52 adjacent to each other in the row direction of the convex pattern row, and similarly, some dot-shaped convex portions 66 are shared by the convex patterns 52 adjacent in the direction intersecting the row direction of the convex pattern row. It is a form.

  In the manufacturing method of the present invention, as shown in FIGS. 1A to 1C, an embossing roll 50 disposed on the outer peripheral surface 56 of the roll so that the convex pattern row 54 draws a spiral curve C having the roll axis A as the central axis. Is used. That is, when the convex pattern row 54 is regarded as one line, the convex pattern row 54 is arranged so that the line draws a spiral curve C. In FIG. 1B, a spiral curve C is drawn along the row direction D2 of the convex pattern row 54.

  The form of the spiral curve is not particularly limited except that it is 1) a spiral curve with the axis of the embossing roll as the central axis, and 2) a spiral curve formed on the outer peripheral surface of the embossing roll. For example, an embossing roll arranged so that a plurality of parallel convex pattern rows exist on the outer peripheral surface of the roll and a plurality of spiral curves parallel to each other can be used. However, in the manufacturing method of the present invention, as shown in FIGS. 1A to 1C, only one row of convex pattern rows 54 exists on the outer peripheral surface 56 of the roll, and the convex pattern row 54 draws one spiral curve C. It is preferable to use the embossing roll 50 arranged as described above.

  The pitch of the spiral curve is not particularly limited, but as shown in FIG. 1B, the spiral curve C is arranged on the outer peripheral surface 56 of the roll so that the spiral curve passes 2 to 4 times per product width W of the sanitary paper. The embossing roll 50 is preferably used.

  As shown in FIG. 1B, when the convex pattern row 54 is arranged on the outer peripheral surface 56 of the roll so as to draw a spiral curve C, the convex pattern row 54 is at a constant angle θ1 with respect to the rotation direction D1 (circumferential direction) of the roll. It will be arranged to incline.

  The inclination angle of the convex pattern row may be appropriately set in consideration of the shape and size of the convex pattern, the pitch of the convex pattern row (spiral curve), the winding length of the long sanitary paper, the roll diameter of the embossing roll, etc. . Designed so that the roll thickness is uniform when winding up sanitary paper, and only a part of the outer peripheral surface of the roll sanitary paper (the part corresponding to the design embossing of the sanitary paper) does not protrude significantly. It is preferable to set the angle so that the emboss is uniformly dispersed in the width direction of the long sanitary paper. For example, it can be set to 5 to 10 °.

  In the manufacturing method of the present invention, as shown in FIG. 1B, embossing rolls in which the convex patterns 52 adjacent to each other in the direction intersecting the column direction D2 of the convex pattern column 54 are arranged while gradually shifting the relative position with respect to the rotation direction D1. It is also preferable to use 50. In such an arrangement, the gap (step) between the convex pattern 52 and the convex pattern 52 is a rotation of the roll as compared with an arrangement in which the convex patterns are arranged in parallel in the direction orthogonal to the circumferential direction of the roll. Since it is dispersed in the direction D1, when viewed as a whole roll, the convex pattern 52 can be always pressed against the long base paper. Therefore, there is an effect that the rotation of the embossing roll 50 is stabilized and the processing stability at the time of forming the design embossing is improved.

  The embossing roll 50 shown in FIG. 1B is arranged so that the concentric convex patterns 52 are juxtaposed in a direction intersecting the column direction D2, and a straight line L extending in the parallel direction is defined as a roll rotation direction D1 (circumferential direction). It can be seen that the relative positions of the convex pattern 52 with respect to the rotation direction D1 are gradually shifted without being orthogonal. In the illustrated example, the relative position of the convex pattern 52 is shifted to the upstream side with respect to the rotation direction D1 of the roll as it goes to the right side of the figure.

  There is no particular limitation on how much the relative position with respect to the rotation direction of the roll is shifted. As shown in FIG. 1B, when the convex patterns 52 are arranged so as to be parallel in the direction intersecting the column direction D2, the angle θ2 between the straight line L extending in the parallel direction and the straight line parallel to the axis A of the roll. Is preferably shifted so as to be 5 to 10 °.

  The embossing roll can be configured in the same manner as the embossing roll that forms the normal design embossing for portions other than the characteristic portion.

  The height of the convex pattern (the height of the convex pattern top surface with respect to the outer peripheral surface of the roll) is preferably 0.5 to 2.0 mm. By setting it to 0.5 mm or more, it becomes possible to exhibit the design improvement effect by design embossing. On the other hand, the defect which the softness | flexibility and tactile sense of a design emboss formation part fall can be suppressed by setting it as 2.0 mm or less.

  The width (length in the axial direction) of the embossing roll is not particularly limited. However, when the roll-like sanitary paper 1 having the product width W as shown in FIG. 2 is obtained, it is 10 to 30 times the product width W (roll toilet paper: 105 to 114 mm, roll kitchen towel: 210 to 228 mm). In many cases, a wide long base paper having a width of 1 mm is used. And it is common to produce this wide wide base paper by embossing, winding it by the length of the product to make a wide roll-like sanitary paper (log), and then cutting it to the product width W. . When such a method is adopted, an embossing roll having a width corresponding to the wide long base paper is used. Although the diameter of the embossing roll is not particularly limited, one having an outer diameter of 300 to 600 mmφ is usually used.

  The ratio (area occupancy) of the total area of the convex pattern top surface to the area of the entire outer peripheral surface of the embossing roll is preferably 0.1 to 20%. When the content is 0.1% or more, the design is easy to visually recognize, and the effect of improving the design properties by forming the design emboss is exhibited. By setting it to 20% or less, it is possible to suppress a problem that the area of the design embossing becomes too large and the flexibility of the sanitary paper is impaired.

[3-2] Formation of design emboss:
In the present invention, as shown in FIG. 3A, the embossing roll 50 is pressed against the long base paper 70 in a state where the direction of the axis A is arranged so as to be orthogonal to the feeding direction D3 of the long base paper 70. Thereby, the long sanitary paper 2A in which a plurality of design embosses 12 corresponding to the convex pattern 52 is formed on the long base paper 70 is obtained.

  The design embossing is formed by pressing the embossing roll against the long base paper. For example, as shown in FIG. 3A, a long base paper 70 is sandwiched and pressed between an embossing roll 50 and a pair of receiving rolls (rubber roll 80 in the illustrated example), whereby the design embossing is applied to the long base paper 70. 12 can be formed.

  The receiving roll is a metal roll in which a concave pattern complementary to the convex pattern of the embossing roll is formed on the outer peripheral surface of the roll, and a metal roll in which the outer peripheral surface of the roll is coated with rubber. A rubber roll or the like can be used. In the manufacturing method of the present invention, it is preferable to form the design emboss 12 by sandwiching and pressing a long base paper 70 between an embossing roll 50 and a rubber roll 80 as shown in FIG. 3A (rubber steel method). ). In this method, the embossing is not easily broken compared to other embossing methods. Therefore, it is preferable in the point which is excellent in the design improvement effect by design embossing.

As the “long base paper”, for example, a toilet roll base paper can be preferably used, and among them, it is preferable to use a toilet roll base paper made to a basis weight of 10 to 25 g / m ² . By setting the basis weight to 10 g / m ² or more, appropriate strength can be ensured. On the other hand, by setting the basis weight to 25 g / m ² or less, flexibility can be improved and a soft tactile sensation can be imparted. The width of the long base paper is not particularly limited, but when manufacturing a roll-like sanitary paper 1 having a product width W as shown in FIG. 2, a wide long base paper having a width 10 to 30 times the product width W. Is preferably used.

  When manufacturing a multi-ply roll-like sanitary paper, it is necessary to position design embossing on the outer peripheral surface of the roll to improve the design, so that at least the outermost layer base paper (the outermost layer paper constituting the outermost layer of the roll and Design emboss is formed on the long base paper. For example, a design emboss may be formed on the outermost layer base paper, laminated and integrated with the inner layer sheet to form a multi-ply long sanitary sheet, and this may be wound into a roll.

[3-3] Formation of microemboss:
In the manufacturing method of the present invention, not only the design emboss 12 but also the micro emboss 10 may be formed on the long base paper 70 as shown in FIG. 3B.

“Micro emboss” is a fine dot-like emboss formed for the purpose of improving the flexibility of sanitary paper, etc., and does not constitute a single motif (design as a repeating unit). And uniformly formed on the entire long base paper. Specifically, a form in which dot embossing having a top surface area of 0.01 to ² mm ² is uniformly formed on the entire long base paper is preferable.

  Similar to the design embossing, the micro embossing can be formed by pressing an embossing roll having a convex pattern forming the micro embossing formed on the outer peripheral surface of the roll against a long base paper. For the reason that the sanitary paper has a high flexibility improving effect, it is preferable to form micro embossing by a rubber steel method.

As the embossing roll, an embossing roll having a top surface area of 0.01 to ² mm ² (more preferably 0.01 to ¹ mm ² ) per dot-shaped convex portion corresponding to dot embossing formed on a long base paper. It is preferable to use it. At this time, if the top surface has a perfect circular shape or an elliptical shape, it is possible to form a smooth and good micro emboss.

Regarding micro embossing, from the viewpoint of improving flexibility while sufficiently securing strength, the density of dot-shaped convex portions is 51 to 100 / cm ² , and the height of dot-shaped convex portions is 0.5 to 2. It is preferable to use an embossing roll having a total area ratio (area occupancy) of 0.15 to 30% of the top surface of the dot-shaped convex portion with respect to the area of 0 mm and the outer peripheral surface of the embossing roll. Here, “density” is the average density of the dot-shaped protrusions, and means the number of dot-shaped protrusions per unit area.

  When the production method of the present invention is applied to the production of a multi-ply sanitary paper, it is preferable to form the micro emboss 10 on the inner layer paper base 72 as shown in FIG. 3B. Multi-ply sanitary paper is often used in a state where the outermost paper 6B is folded inside. This is because in this folded state, it is desirable that the inner layer paper 4B exposed on the use surface is highly flexible.

  In the method shown in FIG. 3B, first, the design emboss 12 is placed by pressing a long base paper 70 (outermost base paper 74) between the embossing roll 50 and the rubber roll 80 as in the method shown in FIG. 3A. Form. At the same time, the micro emboss 10 is formed by sandwiching and pressing the long base paper 70 (inner layer base paper 72) between the embossing roll 88 and the rubber roll 90. Finally, the inner layer paper base 72 and the outermost layer base paper 74 are laminated and integrated to obtain a multi-ply long sanitary paper 2B.

  However, the micro emboss may be formed not only on the inner layer base paper but also on the outermost layer base paper. By forming micro-embosses on the outer-layer paper base paper in addition to the inner-layer base paper, a roll-like sanitary paper with even more flexibility is obtained compared to the case where micro-emboss is formed only on the inner-layer base paper. be able to. Hereinafter, for convenience of explanation, the microemboss formed on the outermost layer paper base paper is referred to as “outermost layer microemboss”, and the microemboss formed on the inner layer paper base paper is referred to as “inner layer microemboss”.

  The structure already described for the embossing roll for forming the inner layer micro-embossing (top surface area per dot-shaped convex portion, top surface shape, density of dot-shaped convex portions, height of dot-shaped convex portions, area occupancy, etc. ) Can be adopted. A similar configuration can be adopted for the embossing roll for forming the outermost layer micro-embossing.

However, the density of the dot-shaped convex portions is 20 to 50 pieces / cm ² and the height of the dot-shaped convex portions is 0 from the viewpoint of giving good touch to the outermost layer paper without impairing the design properties of the design embossing. It is preferable to form the outermost layer micro embossing using an embossing roll of 5 to 2.0 mm.

Further, an embossing roll having a top surface area of 1.1 to 2.0 mm ² per convex portion is used for forming the inner layer micro embossing, and the top surface area is 0.01 to 1 for forming the outermost layer micro embossing. It is preferable to use an embossing roll of 0.0 mm ² . According to such a method, the pattern of the inner layer micro embossing can be raised as a background design of the design embossing, and the design properties of the resulting sanitary paper can be further improved.

  In order to ensure the design of the design embossing, it is preferable to use an embossing roll whose convex part height is smaller than the convex pattern height of the embossing roll for design embossing formation in forming the outermost layer micro embossing. Specifically, it is preferable that the top surface height of the convex portion is 90% or less with respect to the top surface height of the convex pattern.

[3-4] Ply bonding:
In the manufacturing method of the present invention, for example, as shown in FIG. 3A, a method of ply bonding the outermost layer base paper 74 and the inner layer base paper 72 by the design emboss 12 can be adopted. In such a configuration, since all the base papers (the inner layer base paper 72 and the outermost layer base paper 74) are coupled by the design emboss 12, the design emboss 12 also has the same ply bonding effect as the crimper. Further, according to this method, no adhesive is required, and the manufacturing process can be simplified.

  When the method of ply bonding by design embossing is adopted, the design emboss 12 is formed on both the inner layer paper 4A and the outermost layer paper 6A as in the roll-like sanitary paper 1 shown in FIG.

  Further, in the manufacturing method of the present invention, as shown in FIG. 3B, all the long sanitary papers 2B (the inner layer paper 4B and the outermost layer paper 6B) are laminated, and the portions corresponding to the both side edges of the roll sanitary paper. It is also preferable to combine all the long sanitary papers 2B to form a multi-ply long sanitary paper 2B by forming edge embossing.

  The method as described above can be suitably used for the manufacture of rolled sanitary paper in which design embossing is formed on the outermost layer paper and microembossing is formed on the inner layer paper. In the method shown in FIG. 3B, the design emboss 12 is formed on the outermost layer base paper 74 to form the outermost layer paper 6B, the microemboss 10 is formed on the inner layer base paper 72 to form the inner layer paper 4B, and then the outermost layer paper 6B. The inner layer paper 4B is sandwiched between the edge embossing wheel 92 and the receiving roll (rubber roll 94 in the illustrated example) and pressed to form edge embossing. That is, the edge embossing performs ply bonding of the inner layer base paper 72 and the outermost layer base paper 74 to obtain a multi-ply long sanitary paper 2B in which these are laminated and integrated.

  “Edge embossing” means embossing for preventing ply peeling formed at portions corresponding to both side edges of a roll-like sanitary sheet in a state where a plurality of long sanitary sheets are laminated. “Parts corresponding to the edges on both sides of rolled sanitary paper” means the left and right side parts excluding the center when the finished product sanitary paper is divided into three equal parts in the width direction. And

  The structure of the edge embossing wheel is not particularly limited, and a conventionally known edge embossing wheel can be used. For example, it is possible to use an edge embossing wheel in which two pressing surfaces are formed at portions corresponding to both side edge portions of the roll-like sanitary paper, and convex portions for forming edge embossing are formed on each of the pressing surfaces. According to such an edge embossing wheel, two strips of edge embossing are formed at portions corresponding to both side edges of the rolled sanitary paper. Therefore, when the roll-like sanitary paper 1 as shown in FIG. 2 is manufactured using a wide base paper having a width 10 to 30 times the product width W, the gap between the two edge embosses is cut. By doing this, it is possible to obtain a long sanitary paper having a single edge emboss formed on both side edges.

  The shape and arrangement of the convex portions of the edge embossing wheel are not particularly limited, and can be configured according to a conventionally known edge embossing wheel. Examples of the convex shape include a perfect circle, an ellipse, and a rhombus. What is necessary is just to arrange | position the convex part of these shapes to the press surface of an edge embossing wheel continuously or intermittently. Further, a plurality of convex portions may be arranged in a certain width so as to form a pattern.

  As the receiving roll, it is preferable to use a rubber roll 94 as shown in FIG. 3B. However, a concave roll which is a metal roll in which a concave portion complementary to the convex portion of the edge embossing wheel is formed on the outer peripheral surface of the roll. It may be used.

  Furthermore, in the manufacturing method of the present invention, after forming the outermost layer paper by forming the design emboss on the outermost layer paper base paper, all the long sanitary papers (inner layer paper and outermost layer paper) are laminated and adhesive is used. A multi-ply sanitary paper may be formed by bonding together. According to such a method, the embosses attached to the inner layer paper and the outermost layer paper are not easily crushed and the function of each embossing is not easily lost. There is an advantage that the effect is high.

  As the “adhesive”, an adhesive conventionally used for a paper sheet product may be used. For example, conventionally known adhesives such as PVA (polyvinyl alcohol) and CMC (carboxyl cellulose) can be used.

  The part where the “adhesive” is applied is either the back surface of the outermost layer paper, the front surface of the inner layer paper or both when adhering the outermost layer paper and the inner layer paper. Is one or both of the back surface of the inner layer paper and the front surface of the inner layer paper. However, when the long sanitary paper is a 2-ply sanitary paper, ply bonding can be easily performed by applying an adhesive on the back surface of the outermost layer paper and on the back side of the design emboss.

  For example, after design embossing is formed on the outermost layer base paper to obtain the outermost layer paper, adhesive is applied to the back side of the outermost layer paper and the back side of the design embossing with a glue rubber roll, and then attached to the inner layer paper. By combining them, they can be combined to form a multi-ply sanitary paper (see, for example, JP 2002-505207 A).

  When the method of ply bonding with an adhesive is employed, design embossing is formed on at least the outermost layer paper. Design embossing or micro embossing may be formed on the inner layer paper, or no embossing may be formed.

  As described above, when applying an adhesive on the back side of the outermost layer paper and the back side of the design embossing when obtaining the multi-ply sanitary paper, the adhesive is changed to a color different from the color of the outermost layer paper. It is preferable to use a colored adhesive. With such a configuration, the design embossed portion is colored in a color different from the color of the outermost layer paper, so that the visibility of the design embossing is improved and the design property is improved more than when the design embossing is simply applied. There is.

  As the colored adhesive, it is possible to use a color obtained by mixing a colorant such as a pigment or a dye with the adhesive used for the known sheet products such as PVA and CMC.

[3-5] Winding of sanitary sanitary paper:
In the production method of the present invention, the long sanitary paper obtained as described above is rolled up into a roll-like sanitary paper.

  The winding of the long sanitary paper can be performed as follows using, for example, a winder having a mandrel shaft. 1) First, a core tube to be a winding core is inserted into a mandrel shaft and fixed. 2) An adhesive (referred to as “pickup glue”) is attached to the core tube, and the start end of the long sanitary paper is bonded and fixed to the core tube. 3) By rotating the mandrel shaft, the long base paper is wound around the core tube by the length of the product.

  As the core tube 20, a paper tube made of thick paper such as cardboard is preferably used. Although the size varies depending on the type of roll sanitary paper, one having an outer diameter of 35 to 50 mmφ and a thickness of 0.5 to 1.5 mm is preferably used. As described above, when the roll-like sanitary paper 1 as shown in FIG. 2 is manufactured using a wide long base paper having a width 10 to 30 times the product width W, the roll-like sanitary paper 1 A long core tube having a length of 10 to 30 times the product width W (that is, the length of the core tube 20 shown in FIG. 2) is used.

  Note that the “roll-like sanitary paper” referred to in the production method of the present invention includes not only those having a core tube 20 that serves as a core like the roll-like sanitary paper 1 shown in FIG. A roll-shaped roll (referred to as a “non-core roll”) is also included. The non-core roll can be manufactured according to a conventionally known non-core roll manufacturing method, except that the design embossing is formed by the method described above.

  The winding length of the long sanitary paper varies depending on the type of roll sanitary paper to be manufactured. For example, in the case of rolled toilet paper, it is generally 25 to 90 m, and in the case of rolled kitchen towel, it is generally set to 10 to 20 m.

  After winding the long sanitary paper by a predetermined length, an adhesive (referred to as “tail seal glue”) is attached to the end of the long sanitary paper or the outer peripheral surface of the formed roll. It is preferable to bond and fix the end of the long sanitary paper to the outer peripheral surface of the roll. It is preferable to use a water-soluble adhesive as the tail seal paste.

  As described above, when the roll-like sanitary paper 1 as shown in FIG. 2 is manufactured using a wide long base paper having a width 10 to 30 times the product width W, the wide roll-like sanitary paper is used. Paper (referred to as “log”) can be obtained. This log is cut into a product width W as shown in FIG. 2 by using a conventionally known cutting blade such as a log saw (round blade), a band saw (flat blade) or the like, so that the roll-like sanitary paper 1 as the final product is obtained. And The thickness of the cutting blade is preferably 2 to 10 mm.

[4] Rolled sanitary paper:
A long sanitary paper 2A formed by the manufacturing method of the present invention so that the design emboss row as shown in FIG. 2 is inclined with respect to the longitudinal direction (that is, the design emboss 12 is gradually shifted in the width direction). A roll-shaped sanitary paper 1 is obtained by being wound into a roll.

  A roll-like sanitary paper 1 shown in FIG. 2 is a two-ply sanitary paper in which two long sanitary papers 2A (outermost layer paper 6A and inner layer paper 4A) are laminated. However, the production method of the present invention is also applicable to the production of multi-ply sanitary paper, etc., in which a single ply sanitary paper made of a single-layer long sanitary paper and three or more long sanitary papers are laminated. be able to.

  Hereinafter, the Example of the manufacturing method of this invention is demonstrated more concretely by the example at the time of manufacturing the roll-shaped sanitary paper 1 shown in FIG.

Example 1
In Example 1, design embossing was formed using the embossing roll 50 shown to FIG. 1A-FIG. 1C.

[1] Embossing roll:
The embossing roll 50 is a metal roll, and a convex pattern row 54 in which concentric convex patterns 52 are repeatedly arranged is formed on the outer peripheral surface 56, and the convex pattern row 54 has the axis A of the roll as a central axis. It arrange | positions on the outer peripheral surface 56 of a roll so that the spiral curve C to do may be drawn.

The embossing roll 50 is a concentric convex pattern 52 formed by collecting and arranging circular frustoconical dot-shaped convex portions 58 having a top surface of 1 mmφ (top surface area 0.785 mm ² ) and a convex portion height of 0.8 mm. This is an example of formation. The embossing roll 50 is formed so that the outer diameter of the outermost circle of the concentric circles constituting the convex pattern 52 is 30 mm, and the total top surface area of the dot-shaped convex portions located on the inner side is about 117 mm ^2. It has become. The density of the dot-shaped convex portions 58 relative to the outer peripheral surface of the embossing roll is 21.17 pieces / cm ² , and the ratio of the total area of the top surfaces of the dot-shaped convex portions 58 to the total area of the outer peripheral surface of the embossing roll (area occupation ratio) Is 16.33%.

  In the embossing roll 50, the convex patterns 52 adjacent to each other in the column direction D2 of the convex pattern row 54 share the eleven dot-shaped convex portions 64 and are adjacent to each other in the direction intersecting the column direction D2 of the convex pattern row 54. The convex patterns 52 to be formed share the 21 dot-shaped convex portions 66 to form the convex pattern 52.

  The embossing roll 50 is arranged on the outer peripheral surface 56 of the roll so that the convex pattern row 54 draws a spiral curve C with the axis A of the roll as the central axis. In the embossing roll 50, only one convex pattern row 54 exists on the outer peripheral surface 56 of the roll, and the convex pattern row 54 is arranged so as to draw one spiral curve C. The spiral curve C is arranged on the outer peripheral surface 56 of the roll so as to pass about 3.5 times per product width W of sanitary paper (roll toilet paper, product width 114 mm). The inclination angle θ1 of the convex pattern row 54 with respect to the roll rotation direction D1 (circumferential direction) was 5 °.

  In the embossing roll 50, the convex patterns 52 adjacent to each other in the direction intersecting the row direction D2 of the convex pattern row 54 are arranged while gradually shifting the relative positions with respect to the rotation direction D1. The embossing roll 50 is arranged so that adjacent convex patterns 52 are juxtaposed in a direction intersecting the column direction D2, and an angle θ2 between a straight line L extending in the parallel direction and a straight line parallel to the axis A of the roll. Was arranged to be 5 °.

  The width (length in the direction of the axis A) of the embossing roll 50 was about 27 times (3100 mm) the product width W (114 mm) of the rolled sanitary paper 1 (rolled toilet paper) shown in FIG. The diameter of the embossing roll 50 was 300 mmφ.

[2] Formation of design emboss:
In Example 1, as shown in FIG. 3A, the embossing roll 50 was pressed against the long base paper 70 in a state where the direction of the axis A was arranged so as to be orthogonal to the feeding direction D3 of the long base paper. The design emboss 12 was formed by inserting and pressing the long base paper 70 between the embossing roll 50 and the rubber roll 80 which makes a pair.

  Specifically, one of the feed rolls 86A, 86B (or 86C, 86D) is rotated as a drive roll and the other is driven, and the inner layer base paper 72 and the outermost layer base paper 74 are supported while being supported by the guide rolls 84A, 84B. It sent between the embossing roll 50 and the rubber roll 80, and pressed. Thus, the design emboss 12 was formed on all the base papers (inner layer base paper 72 and outermost layer base paper 74) to obtain a multi-ply long sanitary paper 2A composed of the inner layer paper 4A and the outermost layer paper 6A.

The long stencil sheet 70, made of toilet rolls for sheet paper made to a basis weight of 18 g / m ^2, the wide elongate sheet having a 27-fold width of the product width W of the rolled sanitary paper 1 shown in FIG. 2 (3078mm) Was used.

[3] Ply bonding:
In the first embodiment, as shown in FIG. 3A, a method of ply bonding the outermost layer base paper 74 and the inner layer base paper 72 by the design emboss 12 is adopted. Ply bonding with an adhesive was not performed.

[4] Rolling up long sanitary paper:
In Example 1, a long sanitary paper was wound using a winder having a mandrel shaft.

  The core tube has an outer diameter of 38 mmφ made of cardboard, a thickness of 1.5 mm, and a length 27 times the product width W (114 mm, ie, the length of the core tube 20) of the rolled sanitary paper 1 shown in FIG. 3078 mm) was used. The winding length of the long sanitary paper was 30 m.

  The formed log is cut into a width of 114 mm using a log saw (round blade) having a maximum blade thickness of 4.8 mm, so that the roll-shaped sanitary paper 1 (rolled toilet paper) having a product width W shown in FIG. ).

  The production method of the present invention can be suitably used for the production of roll-like sanitary paper such as toilet paper and kitchen towels. Among them, it can be suitably used for the production of toilet paper.

1: Rolled sanitary paper, 2A, 2B: Long sanitary paper, 4A, 4B: Inner layer paper, 6A, 6B: Outer layer paper, 10: Micro emboss, 12: Design emboss, 20: Core tube, 50: Emboss roll 52: convex pattern, 54: convex pattern row, 56: outer peripheral surface, 58, 64, 66: dot-like convex part, 60: side surface, 62: rotating shaft, 64, 70: long base paper, 72: inner layer paper Base paper, 74: Outermost layer base paper, 80, 90, 94: Rubber roll, 84A, 84B: Guide roll, 86A, 86B, 86C, 86D: Feed roll, 88: Emboss roll, 92: Edge emboss wheel, A: Axis , L: straight line, C: spiral curve, W: product width, D1: rotation direction, D2: row direction, D3: delivery direction.

Claims (5)

Using an embossing roll arranged on the outer peripheral surface of the roll so that a convex pattern row is formed by repeatedly arranging convex patterns of the same shape, and the convex pattern row draws a spiral curve with the axis of the roll as the central axis,
By pressing the embossing roll against the long base paper in a state in which the axial direction is orthogonal to the feeding direction of the long base paper, a plurality of the embossing rolls corresponding to the convex pattern To obtain a long sanitary paper with a design emboss
A method for producing a roll-like sanitary paper that winds the long sanitary paper into a roll.   The manufacturing method of the roll-shaped sanitary paper of Claim 1 using what the concentric convex pattern is repeatedly arrange | positioned as said embossing roll.   The method for producing a roll-like sanitary paper according to claim 1 or 2, wherein the embossing roll is one in which dot-shaped convex portions having the same shape are collectively arranged to form the convex pattern.   The roll shape according to claim 3, wherein the embossing roll uses a pattern in which convex patterns adjacent to each other in the column direction of the convex pattern row share the dot-shaped convex portion to form the convex pattern. Sanitary paper manufacturing method.   The embossing roll used is one in which convex patterns adjacent to each other in a direction intersecting the row direction of the convex pattern row share the dot-shaped convex portions to form the convex pattern. 4. A method for producing a roll-like sanitary paper according to 4.

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