JP2011212866A - Embossing method and embossing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an embossing method and an embossing apparatus capable of preventing adhesion of paper powder to an embossed pattern surface or clogging of a groove constituting an embossed pattern, and capable of facilitating continuous manufacture of sanitary paper and facility maintenance.SOLUTION: In the embossing method, embossing rolls 2 and 4 having grooves 2a and 4a constituting the embossed pattern on the roll outer peripheral surface and rubber rolls 6 and 8 having rubber layers 6a and 8a on the roll outer peripheral surface and pressed to the embossing rolls 2 and 4 are used, base paper 14, 16 is made to pass through the embossing rolls 2 and 4 and the rubber rolls 6 and 8 while rotating and driving the embossing rolls 2 and 4, and thereby, embossing in accordance with the embossed pattern is formed on the base paper 14 and 16. Brush rolls 10 and 12 having brushes 10a and 12a made of a fiber-like material on the roll outer peripheral surface side are rotated and driven at a circumferential speed different from the embossing rolls 2 and 4 in the state of being pressed to the embossing rolls 2 and 4.

Description

  The present invention relates to an embossing method and an embossing apparatus for forming emboss on a base paper. More specifically, the present invention relates to an embossing method and an embossing apparatus using a rubber steel method in which an emboss is formed on a base paper by passing the base paper between an emboss roll and a rubber roll.

  In the field of household sanitary paper such as tissue paper, toilet paper, kitchen towels, etc., sanitary paper with embossed base paper is known for the purpose of improving water absorption, softness per skin, and design. ing. Such sanitary paper can be obtained by, for example, a method in which a long base paper is continuously fed from a raw roll wound around a large diameter, and an emboss is continuously formed on the base paper.

  The embossing is formed on the base paper by embossing rolls in which grooves forming embossing patterns (convex parts) are formed on the outer peripheral surface of the roll, and embossing patterns (recessed parts) complementary to the embossing pattern of the embossing roll on the outer peripheral surface of the roll. ) Is engraved on the base paper by passing the base paper between the embossing roll and the concave roll while rotating the embossing roll using the receiving roll (concave roll) engraved with A matched steel method is known (see Patent Document 1).

  Moreover, while using the embossing roll by which the groove | channel which comprises an embossing pattern was engraved in the roll outer peripheral surface, and the rubber roll which has a rubber layer in a roll outer peripheral surface, and is pressed by an embossing roll, rotating the said embossing roll, There is also known a rubber steel method in which an emboss having a shape corresponding to an emboss pattern is formed on a base paper by passing the base paper between an emboss roll and a rubber roll (see Patent Documents 2 and 3).

JP 2009-165533 A (Claims, Claim 1) JP 2003-276949 A (paragraph 0007) Japanese Patent Laying-Open No. 2005-40620 (paragraph 0007)

  The rubber steel method described in Patent Documents 2 and 3 has an advantage that a sanitary paper having high flexibility can be obtained as compared with the matched steel method described in Patent Document 1. Since the rubber steel method partially destroys the aggregate state of the paper fibers constituting the base paper during emboss formation and damages the base paper, it is considered that the emboss formed on the base paper is difficult to disappear.

  However, in the rubber steel method, part of the destroyed paper fiber becomes paper dust, and the generated paper dust is 1) adhesion to the embossed pattern surface, 2) clogging of grooves constituting the embossed pattern, etc. A bug was generated. The adhesion and clogging are not preferable in that it is difficult to form an emboss corresponding to the emboss pattern on the base paper, and the embossing effect cannot be sufficiently imparted to the base paper. If the embossing is continued with this adhesion or clogging being left, the adhered or clogged paper dust will be tightened tightly, making it difficult to remove the paper dust later. There is also a problem that cleaning becomes difficult.

  Because of the circumstances as described above, each time an emboss formation for one roll of raw roll (in the case of toilet paper, about 800 to 2000 times the length) is completed, The clogged paper dust was being cleaned. Such a method is not preferable because it makes it difficult to continuously manufacture sanitary paper and lowers the productivity such as an increased work load for equipment maintenance.

  The present invention has been made in view of such problems of the prior art, and can prevent paper powder from adhering to the surface of the embossed pattern and clogging into the grooves constituting the embossed pattern. It is intended to provide an embossing method and an embossing apparatus that can easily manufacture and maintain the equipment.

  As a result of intensive studies to solve the above problems, the present inventors press the rotating brush roll on the outer peripheral surface of the embossing roll, and perform embossing while removing the paper dust adhering to the embossing roll with the brush roll. Thus, the present inventors have found that the above problem can be solved, and have completed the present invention. That is, according to the present invention, the following embossing method and embossing apparatus are provided.

[1] The embossing roll is rotationally driven using an embossing roll in which grooves forming an embossing pattern are formed on the outer peripheral surface of the roll and a rubber roll having a rubber layer on the outer peripheral surface of the roll and pressed against the embossing roll. In the embossing method for forming an emboss having a shape corresponding to the emboss pattern on the base paper by passing the base paper between the emboss roll and the rubber roll, a brush made of a fibrous material is provided on the outer peripheral surface side of the roll. An embossing method in which a brush roll is pressed against the embossing roll and rotated with a circumferential speed difference from the embossing roll.

[2] An embossing roll in which grooves constituting an embossing pattern are formed on the outer peripheral surface of the roll, and a rubber roll having a rubber layer on the outer peripheral surface of the roll and pressed against the embossing roll, and rotating the embossing roll In an embossing apparatus for forming an emboss having a shape corresponding to the emboss pattern on the base paper by passing the base paper between the embossing roll and the rubber roll while being driven, a brush made of a fibrous material on the outer peripheral surface side of the roll The embossing apparatus further comprising: a brush roll that is pressed against the embossing roll; and a drive unit that rotates the brush roll with a circumferential speed difference from the embossing roll.

[3] The embossing apparatus according to [2], further including a pressing force adjusting mechanism that adjusts the pressing force of the brush roll against the outer peripheral surface of the embossing roll.

[4] The embossing apparatus according to [2] or [3], wherein a height of the brush in the brush roll is configured to be greater than a depth of the groove of the embossing roll.

[5] The embossing apparatus according to any one of [2] to [4], wherein the brush is detachably attached to a roll body of the brush roll.

  The embossing method and the embossing apparatus according to the present invention can prevent paper powder from adhering to the surface of the embossing pattern and clogging the grooves constituting the embossing pattern, and continuously manufacturing sanitary paper and its equipment. Maintenance becomes easy.

It is a model which shows one Embodiment of the embossing method and embossing apparatus which concern on this invention. It is a schematic diagram which shows another embodiment of the embossing method and embossing apparatus which concern on this invention. It is a schematic diagram which shows another embodiment of the embossing method and embossing apparatus which concern on this invention.

  Hereinafter, embodiments for carrying out an embossing method and an embossing apparatus according to the present invention will be specifically described with reference to the drawings. However, the present invention broadly encompasses an embossing method and an embossing apparatus provided with the invention-specific matters, and is not limited to the following embodiments.

[1] Embossing method:
For example, as shown in FIG. 1, the embossing method according to the present invention includes embossing rolls 2 and 4 in which grooves 2a and 4a constituting an embossing pattern are formed on the outer peripheral surface of the roll, and rubber layers 6a and 4a on the outer peripheral surface of the roll. The rubber rolls 6 and 8 pressed by the embossing rolls 2 and 4 are used, and the base papers 14 and 16 are interposed between the embossing rolls 2 and 4 and the rubber rolls 6 and 8 while rotating the embossing rolls 2 and 4. By passing, embosses having a shape corresponding to the emboss pattern are formed on the base papers 14 and 16.

  And in the state which pressed the brush rolls 10 and 12 which have the brushes 10a and 12a which consist of fibrous materials on the roll outer peripheral surface side to the embossing rolls 2 and 4, it rotates with a circumferential speed difference with the embossing rolls 2 and 4. It is to be driven.

  That is, the brushes 10a and 12a of the brush rolls 10 and 12 are brought into sliding contact with the outer peripheral surfaces of the embossing rolls 2 and 4, and the surface or embossing of the embossing pattern of the embossing rolls 2 and 4 by the brushes 10a and 12a of the brush rolls 10 and 12 is performed. It is characterized in that the paper dust adhering to the grooves 2a and 4a constituting the pattern is removed and the emboss is formed while cleaning.

  According to such a method, even if it is a rubber steel method in which paper dust is likely to be generated, paper dust attached to the outer peripheral surface (such as the surface of the embossed pattern) of the embossing rolls 2 and 4, particularly an embossed pattern is configured. Even paper dust adhering to the inside of the grooves 2a, 4a can be scraped and removed by the brushes 10a, 12a of the brush rolls 10, 12. Therefore, it is possible to prevent the paper dust from adhering to the surface of the embossed pattern and clogging to the grooves constituting the embossed pattern, and it is possible to effectively prevent problems caused by the adhesion and the clogging. That is, the formation of embossing is not easily inhibited, and the embossing effect can be sufficiently imparted.

  Moreover, it is not necessary to clean the paper dust adhered or clogged manually every time emboss formation for one roll of the original roll, and the emboss formation can be continued for a long time. Therefore, continuous production of sanitary paper is facilitated, and the work load for equipment maintenance is reduced. That is, the productivity of sanitary paper can be improved.

[1-1] Brush roll:
The “brush roll” referred to in the present invention is a roll having brushes 10a and 12a made of a fibrous material on the outer peripheral surface side of the roll as shown in FIG. , 12).

  “Brush” refers to a portion in which a plurality of single fibers are gathered and arranged with voids, and refers only to a portion made of a fibrous material. Such a brush is excellent in flexibility, ease of deformation, and shape following when it is brought into sliding contact with the outer peripheral surfaces of the embossing rolls 2 and 4. Accordingly, even when the grooves 2a and 4a constituting the emboss pattern formed on the outer peripheral surfaces of the embossing rolls 2 and 4 are very fine, the brushes 10a and 12a are surely provided inside the grooves 2a and 4a. The paper tip adhering to the inside of the grooves 2a and 4a can be reliably scraped off to prevent the emboss pattern from being clogged.

  The type of “fibrous material” is not particularly limited, and may be appropriately selected from conventionally known natural fibers and synthetic fibers according to the purpose. Natural fibers and synthetic fibers that can be elastically bent and deformed are preferable.

  The “brush” may be any one in which a plurality of single fibers are gathered and arranged in a state having a gap, and a so-called brush-like one in which the fibers protrude in the radial direction from the outer peripheral surface of the roll is of course a cloth. Shapes such as felt material are also included. The felt material is also excellent in flexibility, ease of deformation, and shape followability when brought into sliding contact with the outer peripheral surface of the embossing roll, and has the same effect as a so-called brush-like material.

  It is preferable that the brush of the brush roll is detachably attached to the roll body of the brush roll. For example, the felt material has a feature that it is formed in an integral web shape, and is preferable in that it is easy to attach and detach as compared with a so-called brush-like material, and is excellent in terms of replacement work and other maintenance. Further, the “brush roll” referred to in the present invention includes a fibrous material that becomes a brush planted on a resin sheet that becomes a support, and the resin sheet is wound around and fixed to a roll body of a brush roll.

  The “brush” is preferably configured such that its height is greater than the depth of the grooves 2a and 4a constituting the embossing pattern of the embossing roll. By adopting such a configuration, the brush tips of the brushes 10a and 12a can be slidably contacted to the bottoms of the grooves 2a and 4a constituting the emboss pattern, and the inside of the grooves 2a and 4a constituting the emboss pattern It becomes possible to scrape out the paper dust adhering to the sheet more reliably.

  The “brush height” is an index indicating how much the brush portion protrudes from the roll surface (or brush support surface), and is the height of the brush portion with the roll surface or the like as a reference plane. is there. For example, if the depth of the grooves 2a and 4a constituting the emboss pattern is 2 mm, the height of the brush is preferably set to be larger than the depth 2 mm of the grooves 2a and 4a, for example, 3 mm. As an example, in the embossing roll for toilet paper, the depth of the grooves 2a and 4a constituting the embossing pattern is 1 to 2 mm. Therefore, in this case, it is preferable to set the height of the brush to 1.2 to 5 mm.

[1-2] Rotation of brush roll:
In the embossing method of the present invention, as shown in FIG. 1, the brush rolls 10 and 12 are rotationally driven with a circumferential speed difference from the embossing rolls 2 and 4 while being pressed against the embossing rolls 2 and 4. .

  The brush rolls 10 and 12 may be driven to rotate with a difference in peripheral speed from the embossing rolls 2 and 4 while being pressed against the embossing rolls 2 and 4 regardless of the rotation direction. For example, it may be rotated independently of the embossing rolls 2 and 4 by a driving means such as a motor, or may be rotated in conjunction with the embossing rolls 2 and 4 using a gear or a belt. Thereby, the paper dust adhering to the outer peripheral surface of the embossing roll by the brush of the brush roll slidingly contacting the outer peripheral surface of the embossing roll is removed. Moreover, since the contact position of the embossing rolls 2 and 4 and the brush rolls 10 and 12 changes sequentially, the brush rolls 10 and 12 do not wear unevenly and the life of the brush rolls 10 and 12 can be extended.

  In addition, if the brush rolls 10 and 12 are rotationally driven in the direction opposite to the rotation direction of the embossing rolls 2 and 4, the rotation of the embossing rolls is hardly inhibited by the rotation of the brush rolls. For example, in the example shown in FIG. 1, since the embossing roll 2 is rotated counterclockwise, the brush roll 10 is rotated clockwise, and conversely, the embossing roll 4 is rotated clockwise. 12 is rotated counterclockwise.

  The “peripheral speed” means a distance per unit time at which an arbitrary point located on the outer circumference of the roll moves in the rotation direction as the roll rotates. The circumferential speed may take a positive value or a negative value. In general, the peripheral speed of the embossing roll is often 180 to 700 m / min. In this case, the peripheral speed of the brush rolls 10 and 12 may be set in a range of −70 to 700 m / min (however, when the peripheral speed of the brush rolls 10 and 12 is “0”, that is, the brush rolls 10 and 12 Excluding the state where 12 is stopped).

  When the peripheral speed of the brush rolls 10 and 12 takes a positive value, it means that the brush rolls 10 and 12 rotate in the direction opposite to the rotation direction of the embossing rolls 2 and 4. For example, when it is 700 m / min, it means that the brush rolls 10 and 12 rotate in the direction opposite to the rotation direction of the embossing rolls 2 and 4 at a peripheral speed of 700 m / min.

  When the brush rolls 10 and 12 are rotationally driven in a direction opposite to the rotation direction of the embossing rolls 2 and 4, any roll may be rotated quickly as long as there is a difference in peripheral speed between the two rolls. However, in order to increase the effect of removing the paper dust adhering to the outer peripheral surface of the embossing roll, it is preferable to make the peripheral speed of the brush roll faster than the peripheral speed of the embossing roll. For example, if the peripheral speed of the embossing roll is 450 m / min, the peripheral speed of the brush roll may be set to 500 m / min.

  Moreover, when the peripheral speed of the brush rolls 10 and 12 takes a negative value, it means that the brush rolls 10 and 12 rotate in the same direction as the rotation direction of the embossing rolls 2 and 4. For example, in the case of −70 m / min, it means that the brush rolls 10 and 12 rotate in the same direction as the rotation direction of the embossing rolls 2 and 4 at a peripheral speed of 70 m / min.

  When the peripheral speed of the brush rolls 10 and 12 is set to a negative value, the peripheral speed of the brush rolls 10 and 12 is preferably set to a value within 10% of the peripheral speed of the embossing rolls 2 and 4. For example, when the peripheral speed of the emboss rolls 2 and 4 is 700 m / min, it is preferable that the peripheral speed of the brush rolls 10 and 12 is in a range of −70 m / min or more and less than 0 m / min.

  Furthermore, the pressing force of the brush roll against the outer peripheral surface of the embossing roll is adjusted, and the pressing force for pressing the brush roll against the outer peripheral surface of the embossing roll is increased according to the degree of adhesion of the paper powder to the outer peripheral surface of the embossing roll. It is preferable. This method can be implemented by providing a pressing force adjusting mechanism in an embossing apparatus to be described later.

  Even when the paper dust attached to the outer peripheral surface of the embossing roll is removed by the brush roll, it is considered that the paper dust remains attached to the outer peripheral surface of the embossing roll, particularly the bottom of the groove constituting the embossing pattern. It is done. In such a case, the paper dust is firmly tightened over time, and it is not preferable in that it is difficult to remove the paper dust afterwards and to clean the paper dust that has adhered or clogged. As described above, if the pressing force of the brush roll against the outer peripheral surface of the embossing roll is increased, it is possible to easily remove even hard-tightened paper dust.

  As a mechanism for adjusting the pressing force of the brush roll, for example, a mechanism for adjusting the position of the unit including the brush roll and its rotation driving mechanism can be exemplified. According to such a mechanism, the brush of a brush roll and the outer peripheral surface of an embossing roll can be contacted / separated, and the pressing force of a brush roll can be adjusted with the distance between both rolls. As long as the position adjustment is possible, the method is not particularly limited. For example, a mechanical mechanism using a servo motor or the like may be used, or a mechanism for manually adjusting the position may be used. In the case of a mechanism for manually adjusting the position, by incorporating a click mechanism or a ratchet mechanism, it becomes easy to adjust the position at a constant interval, and operability is improved.

  Note that “according to the degree of paper dust adhesion” means that the degree of paper dust adhesion to the outer peripheral surface of the embossing roll is detected by a sensor, and the pressing force of the brush roll is automatically or based on the detection result. A manual adjustment method can be listed (feedback control, etc.). Further, the method is not limited thereto, and a method of visually checking the degree of adhesion of the paper dust to the outer peripheral surface of the embossing roll and manually adjusting the pressing force of the brush roll based on the result may be adopted. Paper dust adhering to the outer peripheral surface of the embossing roll increases as time passes from the start of embossing formation. Therefore, a method of increasing the pressing force of the brush roll with time may be employed.

[1-3] Emboss formation:
The embossing method of this invention should just form embossing according to the conventional rubber steel method except performing embossing in the state which pressed the brush roll against the embossing roll.

  For example, as shown in FIG. 1, the rubber steel method has embossing rolls 2 and 4 in which grooves 2a and 4a constituting an embossing pattern are formed on the outer peripheral surface of the roll, and rubber layers 6a and 8a on the outer peripheral surface of the roll. By using the rubber rolls 6 and 8 pressed against the embossing rolls 2 and 4 and passing the base papers 14 and 16 between the embossing rolls 2 and 4 and the rubber rolls 6 and 8 while rotating the embossing rolls 2 and 4. In this method, embosses having a shape corresponding to the emboss pattern are formed on the base papers 14 and 16. Here, the embossing rolls 2 and 4 are rotationally driven by a driving means such as a motor, and the rubber rolls 6 and 8 are rotated following the embossing rolls 2 and 4 by pressing the embossing rolls 2 and 4.

  Although a specific method is not particularly limited, for example, an emboss corresponding to an emboss pattern engraved on the outer peripheral surface of the embossing roll is formed on the base paper through a long base paper fed from the raw roll between the embossing roll and the rubber roll. A method can be mentioned.

  The “raw fabric roll” is a roll in which a long base paper is wound in a large diameter. In order to enable mass production and continuous production, the base paper is wider and longer than normal products (in the case of toilet paper, width 114 mm, length 65 to 70 m). A roll wound about 60 times and a length of about 800 to 2000 times is used.

The type of “base paper” is not particularly limited, and conventionally known toilet paper base paper and kitchen towel base paper can be used. Among these, it is preferable to use a base paper for toilet paper that has been made to have a basis weight of 10 to 25 g / m ² . When the basis weight is less than 10 g / m ² , proper strength may not be ensured. On the other hand, if the basis weight exceeds 25 g / m ² , the flexibility may be impaired and the tactile sensation may become too hard.

  “Embossing” is a pattern having a shape complementary to an embossing pattern formed by embossing an embossing pattern formed on the outer peripheral surface of an embossing roll on a base paper. By this embossing, irregularities are formed on the base paper and it becomes a bulky state including an air layer, so that the sanitary paper can be given flexibility. Further, by making the embossed pattern into a design shape such as desired characters, figures, symbols, etc., these designs can be given to the base paper, and sanitary paper with high design can be obtained. That is, “embossing” referred to in the present invention includes so-called micro embossing, design embossing, and the like.

“Micro-embossing” is embossing that is applied mainly to improve flexibility. More specifically, it means dot embossing with a top surface area of 0.01 to ² mm ² . Usually, the top surface portion of the micro emboss is formed in a circular shape or a rectangular shape when seen in a plan view, and is arranged uniformly on the entire surface of the long base paper. The shape of the top surface of the dot is not particularly limited, and examples thereof include a circle, an ellipse, a square, and a rhombus.

“Design embossing” refers to embossing having design properties, which is given mainly to improve design properties. More specifically, consists emboss area of the top surface portion exceeds 2 mm ^2, 1 single embossing alone or a plurality of embossing are combined means which form some kind of pattern. The shape of each embossing of the design embossing may be any of dot embossing, line embossing, and embossing in which these are integrally combined. Each pattern may be formed by integral design embossing embossed in a planar shape, or a plurality of design embosses may be collectively arranged to form a single pattern. Although the shape of a pattern is not specifically limited, For example, shapes, such as a flower, a leaf, a geometric pattern, can be mentioned.

  The embossing position is not particularly limited, but the embossing method of the present invention is preferably used when embossing is formed over the entire surface of the base paper. This is because when the emboss is formed over the entire surface of the base paper, a large amount of paper dust is generated, so that the effects of the present invention can be fully enjoyed. For example, it can be said that it is effective when micro embossing or design embossing is formed over the entire surface of the base paper.

  When forming the emboss, the emboss may be formed on the base papers 14 and 16 in a single layer state as shown in FIG. 1, or a multi-layer in which the base papers 14 and 16 are laminated as shown in FIG. You may form embossing in the state of. Further, the emboss can be formed in a multilayer state in which three or more base papers are laminated.

[2] Embossing device:
The embossing apparatus of the present invention includes embossing rolls 2 and 4 in which grooves 2a and 4a forming an embossing pattern are formed on the outer peripheral surface of the roll, and a rubber on the outer peripheral surface of the roll as in the embossing apparatus 1A shown in FIG. Rubber rolls 6 and 8 that are pressed against the embossing rolls 2 and 4, and the embossing rolls 2 and 4 are driven to rotate between the embossing rolls 2 and 4 and the rubber rolls 6 and 8. This is an apparatus for forming an emboss having a shape corresponding to the emboss pattern on the base papers 14 and 16 by passing the base papers 14 and 16.

  And the brush rolls 10 and 12 which have the brushes 10a and 12a which consist of fibrous materials on the roll outer peripheral surface side, and are pressed by the embossing rolls 2 and 4, and the embossing rolls 2 and 4 give a circumferential speed difference, and a brush roll Drive means for rotationally driving the motors 10 and 12. The embossing apparatus of this invention can be used suitably for implementation of the embossing method of this invention.

  In the embossing apparatus 1A shown in FIG. 1, the embossing rolls 2 and 4 and the brush rolls 10 and 12 are rotationally driven by a driving unit (not shown) such as a motor. The drive means may be any means capable of rotating the emboss rolls 2 and 4 and the brush rolls 10 and 12 with a difference in peripheral speed. For example, the embossing roll and the brush roll may be rotationally driven in conjunction with each other using a single driving means, and the embossing roll and the brush roll are separately rotationally driven using a dedicated driving means. You may do it. On the other hand, the rubber rolls 6 and 8 do not have an inherent rotation driving means and rotate following the rotation of the embossing rolls 2 and 4.

  In the section of the embossing method, the embossing apparatus of the present invention includes 1) the structure of the brush roll which is a characteristic part, and 2) the brush roll is provided with a pressing force adjusting mechanism for adjusting the pressing force against the embossing roll. 3) The point that the height of the brush of the brush roll is larger than the depth of the groove constituting the embossing pattern of the embossing roll is preferable. 4) The brush can be attached to and detached from the roll body of the brush roll. The point that it is preferable to be attached to has already been described. Hereinafter, another configuration of the embossing apparatus of the present invention will be described more specifically with reference to the drawings.

[2-1] First embodiment:
An embossing apparatus 1A shown in FIG. 1 forms embosses separately on each of single-layer base papers 14 and 16, and embosses to obtain two-ply sanitary paper by ply bonding the base papers 14 and 16 on which the embosses are formed. This is an example in which the present invention is applied to a processing apparatus (hereinafter, such embossing is referred to as “double embossing”).

  The embossing apparatus for double embossing has two embossing lines corresponding to the number of base papers (two sheets) on which embossing is formed. In the embossing apparatus 1 </ b> A shown in FIG. 1, 1) a line of the embossing roll 2, the rubber roll 6 and the brush roll 10, and 2) a line of the embossing roll 4, the rubber roll 8 and the brush roll 12.

  About an embossing roll and a rubber roll, what was conventionally used by the rubber embossing method can be used as it is.

  The embossing roll is a roll in which grooves 2a and 4a constituting an embossing pattern are formed on the outer peripheral surface of the roll as shown in FIG. 1 (embossing rolls 2 and 4).

  The width (length in the axial direction) of the embossing roll is not particularly limited, and can be appropriately determined depending on the shape and manufacturing method of the sanitary paper. For example, in the case of roll-shaped sanitary paper, the roll-shaped toilet paper is generally 105 to 114 mm wide, and the roll-shaped kitchen towel is generally 210 to 228 mm wide. In many cases, a base paper having a width of 10 to 30 times the product width is wound up by the product length to form a wide roll-like sanitary paper (log) and cut into the product width. In such a case, an embossing roll having a width corresponding to the log may be used.

  The outer diameter of the embossing roll is not particularly limited. For example, an outer diameter of 300 to 600 mmφ can be used.

The embossing pattern in the case of forming microembossing is such that the top surface area per dot embossing formed on the base paper is 0.01 to ² mm ² (more preferably 0.01 to ¹ mm ² ). It is preferable that the emboss pattern has a shape complementary to the above. At this time, it is preferable to use an embossed pattern having a top surface portion of a perfect circle or an ellipse because it is possible to form a micro emboss that is smooth and has a good touch.

Moreover, regarding micro embossing, from the viewpoint of improving flexibility while ensuring sufficient strength, the embossing density is 51 to 100 pieces / cm ² , the embossing depth is 0.5 to 2.0 mm, and the base paper The ratio (area occupancy) of the total area of the top surface of each emboss to the area is preferably 0.15 to 30%. Therefore, it is preferable that the emboss pattern when forming the micro emboss is an emboss pattern having a shape complementary to such an emboss. Here, the “emboss density” is an average emboss density and means the number of dot embosses per unit area.

  On the other hand, the embossing pattern when forming the design embossing is such that the ratio of the embossed top surface area of the design embossing to the surface area of the base paper (area occupation ratio) is 0.1 to 20%, and the area of the outer peripheral surface of the roll. It is preferable to set the ratio (area occupancy) of the top surface area of the embossed pattern to.

  The rubber roll is a roll having rubber layers 6a and 8a covering the outer peripheral surface of the roll as shown in FIG. 1 (rubber rolls 6 and 8), and the rubber layers 6a and 8a are in contact with the outer peripheral surfaces of the embossing rolls 2 and 4. Opposed to get.

  It is preferable to provide a position adjustment mechanism for adjusting the position of the other roll on one or both of the emboss roll and the rubber roll. As a result, the base papers 14 and 16 can be passed between the embossing rolls 2 and 4 and the rubber rolls 6 and 8, and embossing having a shape corresponding to the embossing pattern can be formed on the base papers 14 and 16. As this position adjusting mechanism, those exemplified in the section of the brush roll can be suitably used.

  In the embossing apparatus 1A shown in FIG. 1, embossing is performed when the base papers 14 and 16 sent to the rubber rolls 6 and 8 through the guide rolls 22 and 24 pass between the rubber rolls 6 and 8 and the embossing rolls 2 and 4. Can be formed.

  As shown in FIG. 1, the brush roll is a roll having brushes 10 a and 12 a made of a fibrous material on the outer peripheral surface side of the roll (brush rolls 10 and 12), and can come into contact with the outer peripheral surfaces of the emboss rolls 2 and 4. Are arranged opposite to each other. The brush rolls 10 and 12 have a structure in which a felt material is wound around the outer peripheral surface of the roll and brushes 10a and 12a made of the felt material are installed. The brushes 10a and 12a made of the felt material are configured to be detachable from the roll body of the brush rolls 10 and 12.

  In the embossing apparatus 1 </ b> A shown in FIG. 1, trays 26 and 28 that receive the paper dusts 18 and 20 are installed below the brush rolls 10 and 12. By collecting the paper dusts 18 and 20 scraped by the brush rolls 10 and 12 in the trays 26 and 28, the paper dusts 18 and 20 are hardly scattered around. The shapes of the trays 26 and 28 may be appropriately determined according to the width and outer diameter of the brush rolls 10 and 12. The trays 26 and 28 are preferably arranged so as to cover the lower side of the contact portion between the brush rolls 10 and 12 and the embossing rolls 2 and 4.

  In the embossing apparatus 1A shown in FIG. 1, an edge embossing wheel 32 and a receiving roll 34 are installed. The base papers 14 and 16 on which the embossing is formed are fed from the embossing rolls 2 and 4 to the guide roll 30, and the guide roll 30 forms a two-ply laminate 36. By passing the laminate 36 between the edge embossing wheel 32 and the receiving roll 34, edge embossing for preventing ply peeling is formed at a portion corresponding to the side edge of the product.

  Although the shape of an edge embossing wheel and a receiving roll is not specifically limited, A conventionally well-known edge embossing wheel and receiving roll can be used suitably.

  The edge embossing wheel is a wheel in which a pressing surface having a shape complementary to the edge embossing formed at a portion corresponding to the side edge of the product is formed.

  In the embossing apparatus 1A shown in FIG. 1A, an edge embossing wheel in which two pressing surfaces are intermittently formed for each product width is used. According to such an edge embossing wheel, two strips of edge embossing can be intermittently formed at portions corresponding to both side edges of the product. By cutting the gap between the two edge embosses with a slitter, it is possible to obtain a sanitary paper having one edge emboss formed on each side edge.

  The shape of the edge embossing is not particularly limited, but a shape such as a perfect circle, an ellipse, or a rhombus is continuously or intermittently arranged in the longitudinal direction of the base paper, and the pattern is arranged so as to exhibit a belt shape as a whole. Those are preferred.

  The receiving roll is a roll disposed so as to face the pressing surface of the edge embossing wheel. Edge embossing is formed on the base paper by passing the base paper between the pressing surface of the edge embossing wheel and the outer peripheral surface of the receiving roll.

  The type of the receiving roll is not particularly limited, and may be a metal-made plain roll having no irregularities on the outer peripheral surface, or a metal-made concave roll having a concave portion complementary to the pressing surface of the edge embossing wheel formed on the outer peripheral surface. However, a rubber roll may be used. The embossing apparatus 1 </ b> A shown in FIG. 1A is an example in which a rubber roll is used as the receiving roll 34.

  The embossing apparatus 1A shown in FIG. 1 is provided with the edge embossing wheel 32 and the receiving roll 34. However, in the embossing apparatus of the present invention, a crimper may be installed instead.

[2-2] Second embodiment:
The embossing apparatus 1B shown in FIG. 2 forms a two-ply laminate 36 from the single-layer base papers 14 and 16 and then forms an emboss, and ply-bonds the laminate 36 on which the emboss is formed to provide two-ply hygiene. This is an example in which the present invention is applied to an embossing apparatus for obtaining a sheet (hereinafter, such embossing is referred to as “two-ply embossing”).

  The embossing apparatus 1B shown in FIG. 2 forms the embossing after making the base papers 14 and 16 into a two-ply laminate 36. Accordingly, unlike the embossing apparatus 1A shown in FIG. 1, only one embossing line is provided. That is, it is a line of the embossing roll 2, the rubber roll 6, and the brush roll 10.

  In the embossing apparatus 1B shown in FIG. 2, the base papers 14 and 16 are sent to the guide rolls 42 and 44 through the guide rolls 38 and 40, and the base papers 14 and 16 pass between the guide rolls 42 and 44 so that two plies. It is set as the laminated body 36 of this. The laminate 36 is fed into the embossing roll 2 and the rubber roll 6. Embossing is formed by the laminated body 36 passing between the embossing roll 2 and the rubber roll 6. Edge embossing is formed in the laminated body 36 by passing between the edge embossing wheel 32 and the receiving roll 34.

  In the embossing apparatus 1 </ b> B shown in FIG. 2, a tray 26 that receives the paper dust 18 is installed below the brush roll 10. The configuration of the tray 26 is the same as that of the embossing apparatus 1A shown in FIG. Moreover, the structure of the edge embossing wheel 32 and the receiving roll 34 is the same as that of the embossing apparatus 1A shown in FIG.

[2-3] Third embodiment:
An embossing apparatus 1C shown in FIG. 3 is an example in which the present invention is applied to an embossing apparatus that forms a single-ply base paper 14 with one ply being embossed to obtain a one-ply sanitary paper (hereinafter referred to as the above-described one). Such embossing is referred to as “one-ply embossing”).

  The embossing apparatus 1C shown in FIG. 3 has a configuration in which the guide rolls 38 and 40, the edge embossing wheel 32, and the receiving roll 34 are excluded from the embossing apparatus 1B shown in FIG. Since one ply is used, the guide rolls 38 and 40 for supporting the two base papers, the edge embossing wheel 32 for ply bonding, and the receiving roll 34 are unnecessary.

  In the first to third embodiments, the example in which the brush roll is rotationally driven in the direction opposite to the rotation direction of the embossing roll is shown. However, the present invention is not limited thereto, and the brush roll is the same as the rotation direction of the embossing roll. It may be rotated in the direction.

  The embossing method and the embossing apparatus according to the present invention can be suitably used for manufacturing household sanitary paper such as tissue paper, toilet paper, kitchen towels and the like.

1A, 1B, 1C: Embossing device, 2, 4: Embossing roll, 2a, 4a: Groove, 6, 8: Rubber roll, 6a, 8a: Rubber layer, 10, 12: Brush roll, 10a, 12a: Brush, 14, 16: base paper, 18, 20: paper dust, 22, 24: guide roll, 26, 28: tray, 30: guide roll, 32: edge embossing wheel, 34: receiving roll, 36: laminate, 38, 40 : Guide roll, 42, 44: Guide roll.

Claims (5)

Using an embossing roll in which grooves forming an embossing pattern are formed on the outer peripheral surface of the roll, and a rubber roll having a rubber layer on the outer peripheral surface of the roll and pressed against the embossing roll, while rotating the embossing roll, In an embossing method for forming an emboss having a shape corresponding to the emboss pattern on the base paper by passing the base paper between an emboss roll and the rubber roll,
An embossing method in which a brush roll having a brush made of a fibrous material on a roll outer peripheral surface is pressed against the embossing roll and rotated with a difference in peripheral speed from the embossing roll. An embossing roll in which grooves constituting an embossing pattern are formed on the outer peripheral surface of the roll, and a rubber roll having a rubber layer on the outer peripheral surface of the roll and pressed against the embossing roll, while rotating the embossing roll In an embossing apparatus for forming an emboss having a shape corresponding to the emboss pattern on the base paper by passing the base paper between the emboss roll and the rubber roll,
A brush roll that has a brush made of a fibrous material on the outer peripheral surface side of the roll and is pressed by the embossing roll; and a drive unit that drives the brush roll to rotate with a circumferential speed difference from the embossing roll. Embossing device.   The embossing apparatus of Claim 2 provided with the pressing force adjustment mechanism which adjusts the pressing force of the said brush roll with respect to the roll outer peripheral surface of the said embossing roll.   The embossing apparatus of Claim 2 or 3 with which the height of the said brush in the said brush roll is comprised larger than the depth of the said groove | channel of the said embossing roll.   The embossing apparatus as described in any one of Claims 2-4 by which the said brush is attached to the roll main body of the said brush roll so that attachment or detachment is possible.

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