JP6844741B1 - Manufacturing method of sanitary tissue paper roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a hygienic tissue paper roll capable of preventing loosening of a sheet and running out of paper. SOLUTION: A base paper sheet is unwound from a raw fabric roll 11R, 12R on which base paper sheets 11L, 12L are wound, and the unwound base paper sheet is embossed to form an embossed sheet, and the embossed sheet is rolled into a roll shape. A method for manufacturing a sanitary tissue paper roll including a winding roll forming step of winding to form a winding roll. In the winding roll forming step, between the winding speed of the embossed sheet and the processing speed of embossing. A method for manufacturing a sanitary tissue paper roll in which the speed difference is made smaller than the speed difference between the processing speed and the feeding speed of the base paper sheet. [Selection diagram] Fig. 2

Description

The present invention relates to a method for producing a sanitary tissue paper roll, and more particularly to a method for producing a sanitary tissue paper roll, which comprises a step of embossing a base paper sheet to form an embossed sheet.

For the production of sanitary tissue paper such as toilet paper, tissue paper, and kitchen paper, raw fabric rolls in which a base paper sheet is wound are used. For example, in Patent Document 1, a base paper sheet is unwound from a raw fabric roll, the unrolled base paper sheet is embossed to form an embossed sheet, and the embossed sheet is wound into a roll to form a winding roll. A manufacturing method for processing the take-up roll thus obtained into a toilet roll (roll-shaped toilet paper) product is disclosed.

In the winding roll forming process from unwinding the base paper sheet from the original roll to winding the embossed sheet on the winding roll, if excessive tension is generated in the base paper sheet or the embossed sheet, or if the base paper sheet or the embossed sheet is loosened. , May cause paper scraps and wrinkles. In order to prevent such inconvenience, the tension of the base paper sheet and the embossed sheet is adjusted (also referred to as “draw adjustment”) between the original roll and the take-up roll. Draw adjustment is generally the speed difference between the raw roll and the take-up roll, that is, the speed difference between the feeding speed of the base paper sheet from the raw roll and the take-up speed of the embossed sheet to the take-up roll. It is controlled, and more specifically, the draw adjustment is made with an adjustment that keeps the speed difference between the original roll and the take-up roll constant.

JP 2012-183236

However, the embossing destroys the fibers contained in the base paper sheet, and changes in paper quality such as a difference in the tensile strength of the sheet before and after the embossing may occur. For this reason, if the draw adjustment is performed while keeping the speed difference between the original roll and the take-up roll constant, the influence of the tension acting on the embossed sheet after the embossing process becomes relatively large, and the embossed sheet may be out of paper. There are problems that wrinkles are generated and that the base paper sheet before embossing is not properly tensioned and the base paper sheet is loosened.

The present invention provides a method for producing a sanitary tissue paper roll capable of applying appropriate tension to a base paper sheet or embossed sheet to prevent loosening or running out of the base paper sheet or embossed sheet at any stage before and after embossing. The purpose is to provide.

As a result of diligent studies to solve the above problems, the present inventor unwinds the base paper sheet from the raw fabric roll from which the base paper sheet is wound, and embosses the unwound base paper sheet to form an embossed sheet. In the winding roll forming step of forming and winding the embossed sheet into a roll to form a winding roll, the speed difference between the winding speed of the embossed sheet and the processing speed of embossing is defined as the processing speed. It has been found that the above problem can be solved by making the speed difference between the base paper sheet and the feeding speed smaller than the speed difference.

Specifically, the present invention has the following configuration.
[1] The base paper sheet is unwound from the original roll from which the base paper sheet is wound, and the unwound base paper sheet is embossed to form an embossed sheet, and the embossed sheet is wound into a roll to form a winding roll. It is a method for manufacturing a sanitary thin paper roll including a winding roll forming step to be formed. In the winding roll forming step, the winding speed Vw of the embossed sheet, the processing speed Ve of the embossing process, and the feeding speed Vu of the base paper sheet are formed. And , the following equations (I) and (II)
Winding speed Vw ÷ processing speed Ve × 100 (%) <machining speed Ve ÷ feeding speed Vu × 100 (%) ... Equation (I)
100% ≤ winding speed Vw ÷ feeding speed Vu x 100 (%) ≤ 110% ... Equation (II)
A method of manufacturing sanitary tissue paper rolls so that
[2] In the winding roll forming step, the processing speed Ve is made faster than the feeding speed Vu and equal to or faster than the winding speed Vw, and tension is applied until the embossed sheet is wound into a roll. The method for producing a sanitary tissue paper roll according to [1], wherein a tension is applied to the embossed sheet so that a tension weaker than the tension applied to the base paper sheet is applied to the embossed sheet by means.
[3] In the take-up roll forming step, a plurality of raw fabric rolls are used, and the base paper sheets unwound from each of the plurality of raw fabric rolls are overlapped, and then the laminated base paper sheets are embossed. The method for producing a sanitary tissue paper roll according to [2], wherein the embossed sheet in the form of a laminated sheet is formed, and the tension is applied to the embossed sheet in the form of a laminated sheet by the tension applying means.
[4] In the take-up roll forming step, a plurality of raw fabric rolls were used, and the base paper sheets unwound from each of the plurality of raw fabric rolls were embossed to form the plurality of embossed sheets. Before the plurality of embossed sheets are wound into a roll to form a take-up roll, the plurality of embossed sheets are laminated to form a laminated embossed sheet, and the plurality of embossed sheets included in the laminated embossed sheet are included. The sanitary thin leaf paper roll according to [2], wherein the laminated embossed sheet is subjected to a joining embossing process for joining the two to each other, and the tension is applied to the laminated embossed sheet to which the joining embossing process has been performed. Production method.

In the method for producing a sanitary tissue paper roll of the present invention, a base paper sheet is unwound from a roll of raw paper from which the base paper sheet is wound, and the unwound base paper sheet is embossed to form an embossed sheet, and the embossed sheet is rolled. In the take-up roll forming step of forming a take-up roll, the speed difference between the take-up speed of the embossed sheet and the processing speed of embossing is set between the processing speed and the feeding speed of the base paper sheet. It is made smaller than the speed difference.

According to this, if the draw adjustment conditions are different between the upstream side and the downstream side of the embossed portion to be embossed, that is, the stage before the embossing is performed and the stage after the embossing is performed. At the same time, the tension applied to the base paper sheet or the embossed sheet can be adjusted. The draw adjustment conditions can be set according to changes in paper quality due to embossing.

Therefore, according to the present invention, it is possible to apply an appropriate tension to the base paper sheet or the embossed sheet to prevent the base paper sheet or the embossed sheet from loosening or running out of paper at any stage before and after the embossing process.

It is a figure which shows the example of the sanitary tissue paper roll to which the embodiment of this invention is applied. It is a figure which shows the example of the manufacturing equipment applicable to the embodiment of this invention. (A) to (c) are diagrams showing an example of embossing according to the embodiment of the present invention.

A method for producing a sanitary tissue paper roll according to an embodiment of the present invention will be described. Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments and drawings have been described for illustrative purposes only and are not intended to limit the present invention.

(First Embodiment)
(Manufacturing method of hygienic tissue paper roll)
In the method for producing a sanitary tissue paper roll according to the first embodiment of the present invention, a base paper sheet is unwound from a raw paper roll from which a base paper sheet is wound, and the unwound base paper sheet is embossed to form an embossed sheet. Including a winding roll forming step of winding the embossed sheet into a roll to form a winding roll, in the winding roll forming step, between the winding speed of the embossed sheet and the processing speed of embossing. The speed difference is made smaller than the speed difference between the processing speed and the feeding speed of the base paper sheet.

(Original roll)
The raw roll applicable to this embodiment can be manufactured by a papermaking technique known in the art. For example, the raw fabric roll can be obtained by forming a base paper sheet using a paper machine and winding the formed base paper sheet around a winding core. As the paper machine, known paper machines such as a twin wire former method, a circular net former method, a suction prestoformer method, and a crescent former method may be used.

(Base paper sheet)
The base paper sheet is obtained by making a slurry containing a pulp component which is a fiber raw material.

(Pulp component)
Examples of the pulp component include wood pulp, non-wood pulp, and deinked pulp. Examples of wood pulp include broadleaf pulp (blightwood kraft pulp (LKP)), coniferous tree pulp (coniferous kraft pulp (NKP)), sulfite pulp (SP), dissolved pulp (DP), soda pulp (AP), and unbleached craft. Examples thereof include chemical pulp such as pulp (UKP) and oxygen bleached kraft pulp (OKP). Further, semi-chemical pulp such as semi-chemical pulp (SCP) and chemiground wood pulp (CGP), mechanical pulp such as crushed wood pulp (GP) and thermomechanical pulp (TMP, BCTMP) can be mentioned, but are not particularly limited. Examples of the non-wood pulp include cotton pulp such as cotton linter and cotton lint, non-wood pulp such as hemp, straw and bagasse, and cellulose, chitin and chitosan isolated from squirrel and seaweed, but are not particularly limited. .. Examples of the deinked pulp include deinked pulp made from used paper, but the deinking pulp is not particularly limited. As the pulp component, one of the above may be used alone, or two or more of them may be mixed and used. Since these pulp components greatly affect the quality of sanitary paper, they are appropriately blended in a predetermined type and blending ratio according to the required quality.

(Arbitrary ingredient)
Various chemicals may be added to the base paper sheet as optional components for the required quality and stable operation. Examples of the optional component include a dry paper strength agent, a wet paper strength agent, a softener, a bulking agent, a dye, a fragrance, a dispersant, a drainage improver, a pitch control agent, a yield improver and the like. Examples of the dry paper strength agent include cationized starch, polyacrylamide (PAM), carboxymethyl cellulose (CMC) and the like. Examples of the wet paper strength agent include polyamide epichlorohydrin, urea, melamine, and heat-crosslinkable polyacrylamide. Examples of the softener include anionic surfactants, nonionic surfactants, cationic surfactants and the like. The above optional components may be used alone or in combination of two or more.

(Basis weight)
The basis weight of the base paper sheet can be, for example, 7 to 30 g / m ^{2 according to the required quality.} For example, the basis weight of the base paper sheet ^{can be preferably 9 g / m 2} or more, and preferably 17 g / m ² or less. Basis weight is measured according to the provisions of Japanese Industrial Standard JIS P8124.

(Embossed sheet)
The embossed sheet is a sheet formed by embossing the entire surface of the base paper sheet. In the embodiment of the present invention, the embossed sheet 13L may be in the form of a single ply formed by using one base paper sheet 11L (see FIG. 3B), or two or three or more sheets. It may be in the form of a plurality of plies formed by using the plurality of base paper sheets 11L and 12L of the above (see FIGS. 3 (a) and 3 (c)).

When the embossed sheet 13L is in the form of a plurality of plies formed by using the plurality of base paper sheets 11L and 12L, the embossed sheet 13L is embossed on the entire surface of each of the plurality of base paper sheets 11L and 12L. It may be a laminated sheet obtained by laminating them after being applied (see FIG. 3A), or is obtained by laminating a plurality of base paper sheets 11L and 12L and then embossing the entire surface thereof. It may be a laminated sheet (see FIG. 3C). When the embossed sheet is a laminated sheet, in order to prevent peeling of each sheet constituting the laminated sheet, a part of the laminated sheet, for example, both side edges in the width direction (CD direction) may be formed. Further, joint embossing may be applied to join the constituent sheets to each other.

When the embossed sheet is formed by using a plurality of base paper sheets, the type (material, physical properties, etc.) of each base paper sheet may be the same or different depending on the required quality and the like. , Not all base paper sheet types need to be the same.

(Embossing)
The embossing process refers to forming an embossed convex portion on one surface of both sides of the base paper sheet and an embossed concave portion formed on the other surface on the back side of the embossed convex portion. The embossing can be performed by a known method. For example, embossing may be performed by a "matched" embossing roll in which a male (convex) embossing roll and a female (concave) embossing roll of nearly complementary shapes mesh with each other, or with a male (convex) embossing roll. The shape of the female (concave) embossed rolls may not be the same and may be done by so-called "unmatched" embossed rolls that give the sheet a shearing force when they mesh, or male (convex) embossed steel. It may be done by a roll and a plain rubber roll.

(Winling roll)
In the embodiment of the present invention, the take-up roll is formed by unwinding a base paper sheet wound on one or more raw fabric rolls and embossing the unwound base paper sheet to form an embossed sheet. It is formed by winding the embossed sheet into a roll again. The take-up roll can be formed by using any equipment known in the art that includes a sheet feeding function, an embossing function, and a sheet take-up function in this order.

When the take-up roll is formed by using a plurality of raw rolls, the types of the plurality of raw rolls may be the same or different depending on the manufacturing process and / or the required quality of the final product. There may be. From the take-up roll, a sanitary tissue paper roll product is obtained. The take-up roll may be subjected to processing such as dimensional processing as necessary, and the take-up roll itself may be a sanitary tissue paper roll product.

(Hygiene tissue paper roll)
FIG. 1 is a schematic perspective view showing an example of a sanitary tissue paper roll manufactured by the method for manufacturing a sanitary tissue paper roll according to an embodiment of the present invention.

In the example of FIG. 1, the sanitary tissue paper roll is a toilet roll 10. In the toilet roll 10, the embossed sheet 13 is wound around a cylindrical winding core 14 by a predetermined length. In this example, the embossed sheet 13 is a two-ply laminated sheet in which the front surface sheet 11 (hereinafter, also referred to as “first sheet”) and the back surface sheet 12 (hereinafter, also referred to as “second sheet”) are laminated. Has the form of. Hereinafter, in the present specification, when the embossed sheet is in the form of a multi-ply laminated sheet in which a plurality of sheets are laminated, the embossed sheet is also referred to as a "laminated embossed sheet" in particular.

A large number of first embossed portions 11a projecting toward the overlapping surface side with the second sheet 12 are formed on the first sheet 11 in a repeating pattern over the entire surface thereof. Similarly, on the second sheet 12, a large number of second embossed portions 12a are formed at predetermined intervals in an aligned state so as to project toward the overlapping surface side with the first sheet 11 over the entire surface thereof. Has been done. By projecting the first embossed portion 11a and the second embossed portion 12a toward the overlapping surface side of the first sheet 11 and the second sheet 12 in this way, the first sheet 11 and the second sheet The texture of the surface of 12 can be kept good. The patterns of the first embossed portion 11a and the second embossed portion 12a formed on the first sheet 11 and the second sheet 12 are, if necessary, arbitrary patterns other than those exemplified in FIG. May be good.

At both side edges of the laminated embossed sheet 13 in the width direction (CD direction), joining embossed portions 11b and 12b extending along the longitudinal direction (MD direction) project outward from both the front and back surfaces of the laminated embossed sheet 13. It is formed so as not to. The joining embossed portions 11b and 12b define a joining region for integrally joining the first sheet 11 and the second sheet 12, and the first and second embossed sheets 13 from both side edges in the width direction. The peeling of the sheets 11 and 12 can be suppressed.

As described above, FIG. 1 shows a toilet roll 10 in which an embossed sheet in the form of a 2-ply laminated sheet is wound as a sanitary tissue paper roll to which the method for producing a sanitary tissue paper roll according to an embodiment of the present invention can be applied. Was illustrated.

However, the type of sanitary tissue paper roll to which the embodiment of the present invention is applicable is not limited to the example of FIG. 1, and the embodiment of the present invention is wound into any other roll shape such as a kitchen roll. It can be applied to the production of sanitary tissue paper. In addition, an embodiment of the present invention is used to manufacture a secondary raw fabric roll in which a sheet is wound into a roll, which is used for manufacturing a paper bundle-shaped sanitary tissue paper product such as a bagged or boxed tissue paper. Can be applied to.

Further, according to the method for producing a sanitary tissue paper roll according to the embodiment of the present invention, the embossed sheet 13 in the form of two plies as in the example of FIG. 1 is not limited to the first and second sheets 11 and 12. In addition, sanitary tissue paper wound with an embossed sheet in the form of a plurality of plies including one or more sheets and a single ply form consisting of either the first sheet 11 or the second sheet 12. Rolls can be formed.

(Example of manufacturing equipment applicable to the embodiment of the present invention)
FIG. 2 schematically shows an example of a manufacturing facility applicable to the manufacture of sanitary tissue paper rolls according to the embodiment of the present invention. FIG. 2 is for illustrative purposes only and does not limit the present invention.

In the example of FIG. 2, the 2-ply toilet roll 10 shown in FIG. 1 is manufactured. In this example, the original roll stand 20 includes a strip-shaped long base paper sheet 11L (hereinafter, also referred to as “first base paper sheet”) and a strip-shaped long base paper sheet 12L (hereinafter, “second”). The original roll 11R for the first sheet 11 (hereinafter, also referred to as the "first original roll") and the original roll for the second sheet 12, respectively, from which the "base paper sheet" is wound up. 12R (hereinafter, also referred to as "second original roll") is arranged. These first and second raw fabric rolls 11R and 12R have a width several to twenty-odd times the width of the toilet roll 10.

The first raw fabric roll 11R and the second raw fabric roll 12R are rotatably attached to the raw fabric roll stand 20, and the first base paper is rotationally driven by a base paper sheet feeding device (not shown). The sheet 11L and the second base paper sheet 12L can be fed out.

Here, the "base paper sheet feeding speed" according to the embodiment of the present invention means the speed at which the base paper sheet is fed from the original roll. In this example, the speeds 11Vu and 12Vu of feeding the first base paper sheet 11L and the second base paper sheet 12L from the first raw fabric roll 11R and the second raw fabric roll 12R are the "base paper sheet of the base paper sheet" according to the present embodiment. Corresponds to "feeding speed".

As the base paper sheet feeding device, the first and second base paper sheets 11L and 12L can be fed at predetermined feeding speeds of 11Vu and 12Vu, and the feeding speeds of 11Vu and 12Vu can be changed steplessly. Known devices can be used. In the base paper sheet feeding device, for example, the first and second base paper sheets are controlled by a drive unit capable of rotationally driving the shaft passed through the cores of the first and second raw fabric rolls 11R and 12R. The feeding speeds 11Vu and 12Vu of 11L and 12L may be adjusted. Alternatively, the base paper sheet feeding device controls the rotation drive speed of the rotary drive belt that abuts on the outer circumferences of the first and second raw fabric rolls 11R and 12R to rotate the raw fabric rolls 11R and 12R. The feeding speeds 11Vu and 12Vu of 11L and 12L may be adjusted. The rotation speed and the rotation drive speed for adjusting the feeding speeds 11Vu and 12Vu can be controlled by, for example, changing the supply voltage and the supply current to the drive unit.

The first base paper sheet 11L and the second base paper sheet 12L unwound from the first raw fabric roll 11R and the second raw fabric roll 12R are embossed portions 25 arranged on the downstream side of the raw fabric roll stand 20. Will be transported to. Further, a winding portion 26 and a terminal processing portion 27 are arranged in this order on the downstream side of the embossed portion 25.

The embossed portion 25 is simply a unit that embosses a base paper sheet to form an embossed sheet.

The details of the embossed portion 25 in this example will be described with reference to FIG. 3 (a). FIG. 3A is an enlarged extraction view of the vicinity of the embossed portion 25 of the manufacturing equipment shown in FIG. The embossing portion 25 includes guide rollers 30 and 31, emboss roll units 28 and 29, a joining emboss roll unit 32, a tension roll 33, and a frame 34 to which these are attached so as to be separated from each other.

The guide rollers 30 and 31 are arranged on the upstream side of the embossing roll units 28 and 29 in the transport direction of the first and second base paper sheets 11L and 12L inserted through the embossing roll units 28 and 29. The first and second base paper sheets 11L and 12L unwound from the first and second original rolls 11R and 12R are wound around the guide rollers 30 and 31 and directed toward the embossing roll units 28 and 29. You will be guided. The guide rollers 30 and 31 are rotatably attached to the frame 34, and can be rotated by the frictional force accompanying the transportation of the first and second base paper sheets 11L and 12L.

The two sets of embossing roll units 28, 29 used to form the first and second sheets 11 and 12 have embossing rolls 28a, 29a and backup rolls 28b, 29b. The embossed rolls 28a and 29a are rotatably attached to the frame 34. An uneven portion corresponding to the embossing pattern of the first embossing portion 11a shown in FIG. 1 is formed on the outer peripheral surface of the embossing roll 28a for the first sheet 11. Similarly, an uneven portion corresponding to the embossing pattern of the second embossing portion 12a shown in FIG. 1 is formed on the outer peripheral surface of the embossing roll 29a for the second sheet 12. Immediately above the embossing roll 28a for the first sheet 11, the backup roll 28b for the first sheet 11 is movably arranged along the direction facing the embossing roll 28a, and the first sheet 11 is placed between them. The base paper sheet 11L is inserted. Similarly, directly below the embossing roll 29a for the second sheet 12, a backup roll 29b for the second sheet 12 is movably arranged along the direction facing the embossing roll 29a, and a second is provided between them. 12L of base paper sheet is inserted.

The backup rolls 28b and 29b are rotatably attached to roll holders (not shown) whose base ends are swingably attached to the frame 34 about the pivot axis. The tip ends of these roll holders are each pinned to the other end of a fluid pressure cylinder (not shown) whose one end is pinned to the frame 34. Therefore, by pulling back the piston rod of the fluid pressure cylinder, the backup rolls 28b and 29b are pressed against the outer peripheral surfaces of the embossed rolls 28a and 29a at a predetermined pressure. As a result, the first and second base paper sheets 11L and 12L passing between them are embossed.

The joining embossed roll unit 32 is arranged on the downstream side of the embossed roll units 28 and 29, and has an embossed wheel 32a and a receiving roll 32b facing each other in the vertical direction. The receiving roll 32b is rotatably attached to the frame 34 so as to rotate synchronously with the embossed rolls 28a and 29a. An embossing pattern corresponding to the joining embossed portions 11b and 12b shown in FIG. 1 is formed on the outer peripheral surfaces of the embossed wheel 32a and the receiving roll 32b. The embossed wheel 32a located below the receiving roll 32b is rotatably attached to the tip of the piston rod 41a of the fluid pressure cylinder 41 whose base end is pinned to the frame 34. The embossed wheel 32a is pressed against the driving and rotating receiving roll 32b by the fluid pressure cylinder 41 with a predetermined pressing force.

It is also possible to reverse the mounting structure of the embossed wheel 32a and the receiving roll 32b. That is, the embossed wheel 32a may be rotatably attached to the frame 34 and rotated synchronously with the embossed rolls 28a and 29a. In this case, the receiving roll 32b can be pressed against the outer peripheral surface of the embossed wheel 32a by the fluid pressure cylinder 41 in the same manner as the backup rolls 28b and 29b described above, and can be rotated by frictional force.

In this example, at least the uneven portions of the embossing rolls 28a and 29a and the embossing roll unit 32 for joining are made of metal, but the surface portions of the backup rolls 28b and 29b are hard such as elastically deformable hard synthetic rubber. It is made of a rubber-like elastic body.

The tension roll 33 is arranged on the downstream side of the joining embossing roll unit 32 in the embossing portion 25, and is rotatably supported by the tension arm 42. The base end portion of the tension arm 42 is rotatably attached to the frame 34 via the pivot 43.

The tension roll 33 is configured to come into contact with the embossed sheet 13L sent from the embossed portion 25 to the winding portion 26, and to apply a constant tension to the embossed sheet 13L. By applying tension by the tension roll 33, the embossed sheet 13L can be stably conveyed.

The guide rollers 30, 31, the embossing roll units 28, 29, the embossing roll unit 32 for joining, the tension roll 33, and the rotation axes of the respective pivots are set to be parallel to each other. The embossing roll units 28, 29 are configured so that the peripheral speeds 28V, 29V of the embossing rolls 28a, 29a can be controlled to a predetermined speed by a drive source (not shown), and the peripheral speed can be changed steplessly. Has been done.

Here, the "embossing processing speed" according to the embodiment of the present invention means the processing speed of embossing applied to the base paper sheet. In this example, the peripheral speeds 28V and 29Ve of the embossing rolls 28a and 29a correspond to the "embossing processing speed" Ve according to the present embodiment.

The drive source of the embossed roll units 28 and 29 may be a variable speed motor, that is, a prime mover such as a servo motor, and the rotation speed can be changed steplessly by adjusting the supply voltage or the supply current. it can. The embossed rolls 28a and 29a and the receiving roll 32b are assembled with a power transmission mechanism (not shown) for synchronously rotating them. The embossed wheels 32a, backup rolls 28b, 29b, and the like are driven to rotate due to the frictional force associated with the transportation of the first and second base paper sheets 11L, 12L.

In the above-mentioned embossing section 25, the first and second base paper sheets 11L and 12L unwound from the first and second original rolls 11R and 12R are embossed by the embossing roll units 28 and 29. , The first and second embossed portions 11a and 12a (see FIG. 1) are formed, respectively. As a result, the first and second base paper sheets 11L and 12L are provided with tension and suppleness. Next, the first and second base paper sheets 11L and 12L, which have been embossed to form the first and second embossed portions 11a and 12a, are formed by the embossing wheel 32a and the receiving roll 32b of the embossing roll unit 32 for joining. When passing between them, they are overlapped with each other, and the embossed portions 11b and 12b for joining (see FIG. 1) are formed and integrally joined in a laminated state. As a result, the embossed sheet 13L is formed.

With reference to FIG. 2 again, the embossed sheet 13L formed by the embossed portion 25 is sent to the winding portion 26 arranged on the downstream side thereof.

The winding unit 26 winds the tip of the embossed sheet 13L sent out from the embossing unit 25 around a long winding core in the axial direction via an adhesive, and winds the embossed sheet 13L around the winding core by a predetermined length. Then, it is cut by a cutting means (not shown) to form a wide toilet roll 10L having a large dimension in the CD direction. This wide toilet roll 10L corresponds to the "winding roll" according to the present embodiment.

Here, the "winding speed of the embossed sheet" according to the embodiment of the present invention means the speed at which the embossed sheet is wound into the form of a winding roll. In this example, the speed Vw at which the embossed sheet 13L is wound around the winding core corresponds to the “winding speed of the embossed sheet” according to the present embodiment.

For winding the embossed sheet 13L, any known sheet winding capable of winding the embossed sheet 13L at a predetermined winding speed Vw and changing the winding speed Vw steplessly. An embossing device can be used. Even if the sheet winding device adjusts the winding speed Vw of the embossed sheet 13L by controlling the rotation speed by a drive unit capable of rotationally driving the shaft passed through the winding core of the wide toilet roll 10L, for example. Good. Alternatively, the sheet winding device adjusts the winding speed Vw of the embossed sheet 13L by controlling the rotational driving speed of the rotary driving roll that abuts on the outer circumference of the wide toilet roll 10L and rotationally drives the wide toilet roll 10L. It may be. The rotation speed and rotation drive speed for adjusting the take-up speed Vw can be controlled by changing the supply voltage and supply current for the drive unit.

In this example, prior to cutting the embossed sheet 13L at each predetermined length in the winding portion 26, a perforation for breaking across the width direction of the embossed sheet 13L is formed in the longitudinal direction (MD direction) of the embossed sheet 13L. ), It is formed at regular intervals. Any known perforation means can be used to form the perforations for breaking. However, the formation of such breaking perforations is optional and not essential in the embodiments of the present invention.

The end treatment unit 27 glues the end portion of the embossed sheet 13L generated by cutting each predetermined length, which is the winding end portion of the wide toilet roll 10L discharged from the winding unit 26, to the surface of the wide toilet roll 10L. , Prevent the wide toilet roll 10L from being unwound.

The wide toilet roll 10L is then carried out from the end treatment section 27 to a cutting section (not shown) and cut to a predetermined width according to the product specifications and the like to become individual toilet rolls 10.

On the other hand, in the winding portion 26, the tip end portion of the embossed sheet 13L generated by cutting the embossed sheet 13L for each predetermined length (that is, the end portion of the embossed sheet 13L on the first and second original rolls 11R, 12R side). ) Is wound around a new axially long winding core arranged on the winding portion 26 via an adhesive, and the embossed sheet 13L is again wound around the long winding core in this axial direction by a predetermined length. It is supposed to be taken.

(Draw adjustment)
With reference to FIGS. 2 and 3, the draw adjustment by controlling the speed difference between the first and second original rolls 11R and 12R and the take-up roll 10L according to the present embodiment will be described in detail.

In the example shown in FIGS. 2 and 3A, in the step of forming the wide toilet roll 10L of 2 plies from the first and second raw fabric rolls 11R and 12R (that is, the winding roll forming step), the first step is performed. Draw adjustment is performed between each of the second original rolls 11R and 12R and the wide toilet roll 10L (hereinafter referred to as "winding roll 10L") wound by the winding unit 26. ..

The draw adjustment between the first roll 11R and the take-up roll 10L and the draw adjustment between the second roll 12R and the take-up roll 10L can be performed in the same manner. .. The feeding speed of 11Vu for feeding the first base paper sheet 11L from the first raw roll 11R and the feeding speed of 12Vu for feeding the second base paper sheet 12L from the second raw roll 12R are the purposes of draw adjustment. It may be the same or different as long as it has the effect of preventing wrinkles and wrinkles.

Regarding the two raw rolls (first and second raw rolls 11R and 12R), the take-up rolls 10L in which the base paper sheets 11L and 12L unwound from each are wound as the embossed sheet 13L after embossing are common. Therefore, the take-up speed Vw is also common.

Hereinafter, for the sake of simplicity, the first and second original rolls 11R and 12R are referred to as "original roll R", and the first and second base paper sheets 11L and 12L unwound from the original roll R are referred to as "base sheet". "S", the feeding speeds 11Vu and 12Vu of the base paper sheet S are collectively referred to as "feeding speed Vu", and the draw adjustment by speed control for both original rolls 11R and 12R will be collectively described.

The description of the draw adjustment is not limited to the example shown in FIG. 3A, but a modified example of the present embodiment as shown in FIG. 3B, that is, a single original roll 11R. It can also be applied to an example in which a single-ply embossed sheet 13L is used to form a winding roll 10L. Further, the description of the draw adjustment is that when the number of raw fabric rolls R used is 3 or more (that is, when the embossed sheet 13L of a plurality of plies of 3 plies or more forms a winding roll 10L). The same can be applied to (not shown).

In the method for producing a sanitary tissue paper roll according to the present embodiment, in the winding roll forming step, the speed difference between the winding speed Vw of the embossed sheet 13L and the processing speed Ve of embossing is determined between the processing speed Ve and the base paper sheet. Draw adjustment is performed by making the speed difference between S and the feeding speed Vu smaller.

The speed difference between the winding speed Vw and the processing speed Ve can be expressed by the formula Vw ÷ Ve × 100 (%). Further, the speed difference between the processing speed Ve and the feeding speed Vu can be expressed by the formula Ve ÷ Vu × 100 (%).

In the present embodiment, the draw adjustment is performed under the condition that the following equation (I) holds.

Winding speed Vw ÷ processing speed Ve × 100 (%) <machining speed Ve ÷ feeding speed Vu × 100 (%) ... Equation (I)

At this time, the speed difference between the winding speed Vw expressed by the equation Vw ÷ Vu × 100 (%) and the feeding speed Vu is preferably 100% or more and 110% or less, preferably 101. It is more preferable that the content is% or more and 108% or less. If the speed difference is less than 100%, sufficient tension cannot be applied to the base paper sheet S and the embossed sheet 13L, which may lead to loosening and wrinkling of the base paper sheet S and the embossed sheet 13L. If the speed difference exceeds 110%, the base paper sheet S and the embossed sheet 13L are likely to be cut off due to excessive tension.

(Action effect)

In the present embodiment, in the winding roll forming step, the speed difference between the winding speed Vw of the embossed sheet 13L and the processing speed Ve of the embossing is set between the processing speed Ve and the feeding speed Vu of the base paper sheet S. Draw adjustment is performed by making it smaller than the speed difference of.

According to this, the draw adjustment conditions are set on the upstream side and the downstream side of the embossing portion 25 to be embossed, that is, the stage before the embossing and the stage after the embossing. The tension applied to the base paper sheet S and the embossed sheet 13L can be adjusted differently.

The draw adjustment conditions can be set according to changes in paper quality due to embossing. For example, the speed difference is controlled so that the tension applied to the embossed sheet 13L whose tensile strength is reduced due to the fiber breaking by the embossing process is lower than the tension applied to the base paper sheet S before the embossing process is performed. Can be done.

Therefore, according to the present embodiment, an appropriate tension is applied to the base paper sheet S and the embossed sheet 13L at any stage before and after the embossing to prevent the base paper sheet S and the embossed sheet 13L from loosening and running out of paper. Can be done.

(Second embodiment)
Next, a second embodiment of the present invention will be described. Unless otherwise stated, the configurations applicable to the first embodiment are applicable to the present embodiment.

In the method for producing a sanitary tissue paper roll according to the second embodiment, in the take-up roll forming step described in the first embodiment, the processing speed Ve for embossing is set to the feeding speed of the base paper sheet S from the raw paper roll R. It is faster than Vu, and the winding speed of the embossed sheet 13L is equal to or faster than Vw, and the base paper sheet is used for the embossed sheet 13L by tensioning means until the embossed sheet 13L is wound into a roll. The tension is applied so that a tension weaker than the tension applied to S is applied to the embossed sheet 13L.

That is, in the second embodiment, the speed difference control is performed under the condition that the following equations (II) and (III) are satisfied.

Machining speed Ve ÷ Feeding speed Vu × 100 (%)> 100 (%) ・ ・ ・ Equation (II)

Winding speed Vw ÷ Processing speed Ve × 100 (%) ≦ 100 (%) ・ ・ ・ Equation (III)

When the speed difference is controlled under the condition that the formula (III) holds, that is, when the winding speed Vw on the downstream side is equal to or less than the processing speed Ve on the upstream side, the embossing portion 25 and the winding are performed. Sufficient tension may not be applied to the embossed sheet 13L with the take-roll 10L, and the embossed sheet 13L may be loosened or wrinkled.

Therefore, in the present embodiment, the nip (joining embossing) of the embossing roll units 28 and 29 in the embossing section 25 is performed on the embossing sheet 13L sent from the embossing section 25 to the winding section 26 by the tension applying means. When applying, a constant tension is applied between the embossing roll unit 32 for joining) and the winding roll 10L so that the embossed sheet 13L does not loosen. Further, in consideration of changes in paper quality before and after embossing (weakness due to fiber breakage due to embossing), a constant tension applied to the embossed sheet 13L is applied between the original roll R and the embossed portion 25. The tension is weaker than the tension applied to the base paper sheet S of.

As a means for applying tension to the embossed sheet 13L, as shown in FIG. 3, a tension roll 33 is arranged in the embossed portion 25. The tension roll 33 is configured to come into contact with the embossed sheet 13L sent from the embossed portion 25 to the winding portion 26 and to apply a constant tension to the embossed sheet 13L. The tension roll 33 corresponds to the "tension applying means" according to the embodiment of the present invention, but in the embodiment of the present invention, the type of the tension applying means is not particularly limited. The tension applying means may be, for example, a dancer roll such as a weight dancer using weight or a spring dancer using a spring, and the dancer roll is configured to be pressurized by an air cylinder using air pressure or the like. May be.

In setting the magnitude of the tension applied to the embossed sheet 13L by the tension applying means, the tension applied to the base paper sheet S between the raw fabric roll R and the embossed portion 25 is determined by any known tension detector. Can be detected. The tension applied to the embossed sheet 13L can be appropriately set according to the magnitude of the tension applied to the detected base paper sheet.

The tension applied to the embossed sheet 13L by the tension applying means can be controlled by weight, spring, air pressure or the like according to the type of the tension applying means.

(Action effect)
In the present embodiment, on the upstream side of the embossing portion 25 to be embossed, that is, at the stage before the embossing is performed, the base paper sheet is caused by the speed difference between the embossing speed and the feeding speed of the base paper sheet S. Tension is applied to S. Further, on the downstream side of the embossing portion 25 to be embossed, that is, at the stage after the embossing is performed, the tension applied to the embossed sheet 13L is weaker than the tension applied to the base paper sheet S by the tension applying means. Apply tension.

According to the present embodiment, an appropriate tension can be applied to the base paper sheet S and the embossed sheet 13L in response to changes in the paper quality before and after the embossing process, and the base paper sheet S and the embossed sheet 13L can be loosened or cut. Can be prevented.

(Modified example of embossing)
Next, a modified example of the embossing process according to the embodiment of the present invention will be described with reference to FIGS. 3 (a) to 3 (c). Unless otherwise stated, the configurations applicable to the first and second embodiments are applicable to the present embodiment.

3 (a) to 3 (c) are extracted enlarged views of the vicinity of the embossed portion 25 of the manufacturing equipment shown in FIG. 2, and are of raw fabric rolls (not shown) used for manufacturing sanitary tissue paper rolls. The number or the route of the base paper sheet is different.

(First modification)
The modification shown in FIG. 3A is an embodiment of a method of manufacturing a plurality of ply sanitary tissue paper rolls in which a winding roll is formed by using a plurality of raw fabric rolls, and in particular, a plurality of base paper sheets. This is a so-called double embossing processing example in which each of the above is embossed and then laminated to form a laminated sheet.

With reference to FIG. 3A, in this example, two raw rolls 11R and 12R (not shown) are used, and the base paper sheets 11L and 12L unwound from the two raw rolls are embossed. Two embossed sheets are formed, and then the two embossed sheets formed are wound into a roll at a winding portion 26 (not shown) located downstream of the embossing portion 25 to form a winding roll. In the meantime, two embossed sheets are laminated to form a laminated embossed sheet 13L.

In this modification, in order to prevent peeling of each embossed sheet constituting the laminated embossed sheet 13L, the laminated embossed sheet 13L is mainly used for joining by the joining embossing roll unit 32 near the edge portion. Further embossing (so-called edge embossing) is performed.

In this modification, the tension is applied by the tension roll 33 to the laminated embossed sheet 13L after the joining embossing is performed by the joining embossing roll unit 32.

(Second modification)
The second modification shown in FIG. 3B manufactures a single-ply sanitary tissue paper roll in which a single roll 11R (not shown) is used to form a take-up roll 10L (not shown). It is an embodiment of the method.

The embossing portion 25 of the manufacturing equipment shown in the figure is provided with an embossing roll unit 32 for joining. However, since this modification is a single ply, in order to prevent peeling of each sheet constituting the plurality of plies. There is no need for joint embossing. Therefore, after the base paper sheet 11L unwound from the original roll 11R is embossed between the nips of the embossing roll unit 28, the joining embossing roll unit 32 receives the roll without contacting the embossing wheel 32a. It is wound so as to come into contact with only 32b, and is conveyed to the downstream side without being subjected to joint embossing.

(Third variant)
The third modification shown in FIG. 3C is an embodiment of a method for producing a plurality of ply sanitary tissue paper rolls in which a plurality of raw fabric rolls are used to form a take-up roll, and in particular, stacking. This is a so-called single embossing example in which common embossing is performed on a plurality of base paper sheets in a combined state.

With reference to FIG. 3C, in this example, two raw rolls 11R and 12R (not shown) are used, and the base paper sheets 11L and 12L unwound from the two raw rolls are used as guide rollers 30. The two base paper sheets 11L and 12L, which are overlapped while being wound, are inserted between the nips of the embossing roll unit 28 and embossed to form an embossed sheet 13L in the form of a laminated sheet.

In this modification, since the base paper sheets 11L and 12L constituting the embossed sheet 13L in the form of a laminated sheet are subjected to common embossing, both base paper sheets 11L and 12L tend to be difficult to peel off. Therefore, in this modification, the joining embossing process by the joining embossing roll unit 32 is not essential and is performed as needed.

In this embodiment, the tension is applied by the tension roll 33 to the embossed sheet 13L in the form of a laminated sheet. When the joint embossing is performed, such tension is applied to the embossed sheet 13L in the form of a laminated sheet after the joint embossing is performed.

(Application of the invention)

The present invention can be applied not only to toilet rolls, but also to the production of other sanitary tissue rolls such as kitchen rolls (rolled kitchen paper). When the embodiment of the present invention is applied to the production of a two-ply kitchen roll, the embossed portion is wound around the male (convex) embossed roll, for example, between the nips with the outer periphery of the male (convex) embossed roll. A glue rubber roll that adheres glue to the convex portion of the embossed base paper sheet may be further provided to form a 2-ply laminated embossed sheet bonded with glue.

The present invention should be construed only from the matters described in the claims, and even in the above-described embodiment, it is possible other than the matters described by any changes or modifications included in the concept of the present invention. is there. That is, all the matters in the above-described embodiment are not intended to limit the present invention, and are arbitrarily modified according to the use, purpose, etc., including all configurations not directly related to the present invention. What you get.

Ve Embossing processing speed Vu Base paper sheet feeding speed Vw Embossed sheet winding speed 10 Toilet roll 10L Wide toilet roll 11, 12 Sheets 11a, 12a Embossing part 11b, 12b Embossing part for joining 11R, 12R Original roll 11L, 12L base paper sheet 13 embossed sheet 13L (long) embossed sheet 14 core 20 original roll stand 21 base paper sheet feeding device (not shown)
25 Embossed part 26 Winding part 27 End processing part 28,29 Embossed roll unit 28a, 29a Embossed roll 28b, 29b Backup roll 30, 31 Guide roller 32 Joining embossed roll unit 32a Embossed wheel 32b Receiving roll 33 Tension roll 34 frame 41 Fluid pressure cylinder 41a Piston rod 42 Tension arm 43 Pivot

Claims (4)

The base paper sheet is unwound from the original roll from which the base paper sheet is wound, and the unwound base paper sheet is embossed to form an embossed sheet, and the embossed sheet is wound into a roll to form a winding roll. This is a method for manufacturing sanitary tissue paper rolls, which includes a winding roll forming step.
In the winding roll forming step, a winding speed Vw of the embossed sheet, a processing speed Ve of the embossing, and a feeding speed Vu of the base paper sheet, the following formula (I) and (II)
Winding speed Vw ÷ processing speed Ve × 100 (%) <machining speed Ve ÷ feeding speed Vu × 100 (%) ... Equation (I)
100% ≤ winding speed Vw ÷ feeding speed Vu x 100 (%) ≤ 110% ... Equation (II)
A method for manufacturing a sanitary tissue paper roll, which is characterized in that In the take-up roll forming step, the processing speed Ve is made faster than the take-out speed Vu and is equal to or faster than the take-up speed Vw, and the embossed sheet is taken up in a roll shape. The method for producing a sanitary tissue paper roll according to claim 1, wherein a tension is applied to the embossed sheet by a tension applying means so that a tension weaker than the tension applied to the base paper sheet is applied to the embossed sheet. In the take-up roll forming step, the plurality of raw fabric rolls are used, the base paper sheets unwound from each of the plurality of raw fabric rolls are overlapped, and then the laminated base paper sheets are overlapped with the said base paper sheets. The second aspect of claim 2, wherein the embossed sheet in the form of a laminated sheet is formed by embossing, and the tension is applied to the embossed sheet in the form of the laminated sheet by the tension applying means. Sanitary thin paper roll manufacturing method. In the take-up roll forming step, a plurality of the raw fabric rolls are used, and the base paper sheet unwound from each of the plurality of raw fabric rolls is subjected to the embossing process to form the plurality of the embossed sheets.
Before the plurality of the formed embossed sheets are wound into a roll to form the winding roll, the plurality of the embossed sheets are laminated to form a laminated embossed sheet, and the laminated embossed sheet is formed. The laminated embossed sheet is subjected to a joining embossing process for joining the plurality of included embossed sheets to each other.
The method for producing a sanitary tissue paper roll according to claim 2, wherein the tension is applied by the tension applying means to the laminated embossed sheet that has been subjected to the joint embossing process.

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