Adhesion device for tail part of sheet roll and manufacturing method of sheet roll

Abstract

To prevent a tail part of a sheet roll from turning up, and to properly adhere the tail part to an outer peripheral surface of the sheet roll.SOLUTION: An adhesion device 100 which adheres a tail part T of a sheet roll R to an outer peripheral surface of the sheet roll R includes: conveyance means 21 for conveying the sheet roll R; adsorption means for adsorbing the tail part T to a conveyance surface 20 of the sheet roll R in the conveyance means 21; a gluing device 50 for, while the tail part T is adsorbed to the conveyance surface 20 by the adsorption means, coating an adhesive agent with respect to the outer peripheral surface of the sheet roll R positioned inside the tail part T; and an attaching device 70 for attaching the tail part T to the adhesive agent coated on the sheet roll R. The adsorption means includes the conveyance surface 20 charged to polarity opposite from that of the sheet roll R.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a bonding device for bonding the tail portion of a sheet roll such as a toilet roll, and also to a method for manufacturing a sheet roll using the bonding device. [Background technology]

[0002] For example, toilet rolls and kitchen rolls, which are made by winding long sheets of sanitary paper, are manufactured by adhering one end of the roll to the surface of a roll core and the other end to the outer periphery of the roll. In this specification, the end that is adhered to the outer periphery of the roll is referred to as the tail.

[0003] Patent Document 1, for example, proposes a technology for manufacturing methods and equipment for bonding a tail portion to the outer peripheral surface of a sheet roll. In the manufacturing method of Patent Document 1, the tip of the tail portion of the sheet is used as a picking margin, and the tail portion is bonded to the outer peripheral surface of a paper log while leaving this picking margin. At this time, the tail portion is suctioned and fixed while the paper log is transported on a belt conveyor, and glue is applied to the outer peripheral surface of the paper log while fixed, and then the paper log is rotated to wind up the sheet. In this way, the tail portion is bonded to the outer peripheral surface of the paper log. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-284251 Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, the manufacturing method described in Patent Document 1 involves applying adhesive to the outer peripheral surface of a sheet roll (paper log) while sucking the tail portion of the sheet roll with a suction device, and then bonding the tail portion to the outer peripheral surface. However, because sanitary paper such as toilet rolls is often highly breathable, even if the tail portion is sucked with a suction device, it is difficult to continue suctioning the tail portion until the adhesive is completely applied. Meanwhile, the sheet roll travels on a conveying surface formed by a belt conveyor or the like. As the belt conveyor and the sheet roll repel each other due to static electricity generated between them, the tail portion of the sheet roll may curl up. In particular, when the repulsive force due to static electricity exceeds the suction force of the suction device, the curling of the tail portion becomes more pronounced. When the tail portion curls up due to static electricity or the like, the adhesive that should have been applied to the outer peripheral surface of the sheet roll may adhere to the tail portion. Even if the adhesive is successfully applied to the outer peripheral surface of the sheet roll, the tail portion may subsequently break, making it impossible to bond the tail portion to the outer peripheral surface of the sheet roll.

[0006] Therefore, a main object of the present invention is to provide an apparatus and method that can prevent the tail portion of a sheet roll from curling up and properly bond the tail portion to the outer peripheral surface of the sheet roll. [Means for solving the problem]

[0007] The inventors of the present invention have intensively studied means for solving the above-mentioned problems of the prior art, and have discovered that by charging the conveying surface for conveying the sheet roll with a polarity opposite to that of the sheet roll, the sheet roll will be attracted to the conveying surface, thereby preventing the tail portion from curling up when applying adhesive. Based on this discovery, the inventors have come up with the idea of ​​solving the problems of the prior art and have completed the present invention. Specifically, the present invention has the following configuration or steps.

[0008] A first aspect of the present invention relates to a bonding device. The bonding device according to the present invention is used to bond the tail portion of a sheet roll to the outer peripheral surface of the sheet roll. The bonding device includes a conveying means, an adsorption means, a gluing device, and a joining device. The conveying means conveys the sheet roll toward the downstream side of the device. An example of the conveying means is a conveyor. The adsorption means adsorbs the tail portion to the conveying surface of the sheet roll in the conveying means. The conveying surface includes the contact surface between the conveying means and the sheet roll, but may also include the surface of another member (sliding plate) that the sheet roll contacts during conveyance by the conveying means. The gluing device applies adhesive to the outer peripheral surface of the sheet roll located inside the tail portion while the tail portion is adsorbed to the conveying surface by the adsorption means. The joining device joins the tail portion to the adhesive applied to the sheet roll. In this case, the adsorption means includes a conveying surface that is charged with a polarity opposite to that of the sheet roll. For example, if the sheet roll is made of a wood-based material such as toilet paper, the sheet roll is positively charged in the triboelectric series. Therefore, the conveying surface may be formed of a material that is negatively charged (negatively), which is the opposite polarity to the sheet roll in the triboelectric series. If the sheet roll is negatively charged, such as a polyethylene film, the conveying surface may be formed of a material that is positively charged. By charging the conveying surface with a polarity opposite to that of the tail portion of the sheet roll, the tail portion is more likely to adhere to the conveying surface. This prevents the tail portion from curling up.

[0009] In the bonding device according to the present invention, the conveying surface preferably has a permeable portion and a non-permeable portion. In this case, the suction means preferably further includes a suction device that sucks the tail portion through the permeable portion of the conveying surface. In this way, by charging the conveying surface with a polarity opposite to that of the sheet roll and by sucking the sheet roll through the permeable portion of the conveying surface, curling up of the tail portion can be more effectively prevented.

[0010] The gluing device according to the present invention may be configured so that the gluing unit applies adhesive to the outer peripheral surface of the sheet roll while the tail portion is inserted into the gap between the conveyor and the gluing device. By inserting the tail portion into the gap between the conveyor and the gluing device in this manner, the time during which the tail portion is attracted to the conveyor (conveying surface) can be extended. This further improves the effect of charging the conveying surface with a polarity opposite to that of the tail portion and the effect of providing a vent on the conveying surface to attract the tail portion.

[0011] The bonding device according to the present invention may further include a dehumidifying device for dehumidifying at least the space in which the conveying means and the gluing device are provided. By deliberately dehumidifying the space, the adsorption effect of the conveying surface, which is charged with a polarity opposite to that of the sheet roll, is further improved.

[0012] A second aspect of the present invention relates to a method for manufacturing a sheet roll having a tail portion bonded to its outer peripheral surface. In the sheet roll manufacturing method according to the present invention, a sheet roll is conveyed downstream by a conveying means (conveying step). The tail portion is then adsorbed to the conveying surface of the sheet roll (adsorption step). While the tail portion is being adsorbed to the conveying surface, an adhesive is applied to the outer peripheral surface of the sheet roll located inside the tail portion (application step). The tail portion is then attached to the adhesive applied to the sheet roll (attaching step). In the adsorption step, the tail portion is adsorbed to the conveying surface because the conveying surface is charged with a polarity opposite to that of the sheet roll. [Effects of the Invention]

[0013] According to the present invention, the tail portion of the sheet roll can be prevented from curling up, and the tail portion can be properly bonded to the outer peripheral surface of the sheet roll. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a side view that schematically shows a bonding device according to one embodiment of the present invention. [Figure 2] FIG. 2 is a plan view schematically showing a part of a bonding device according to one embodiment of the present invention. [Figure 3] FIG. 3 is a plan view schematically showing a modification of the embodiment shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below, and includes appropriate modifications of the embodiments described below within the scope obvious to those skilled in the art. Each drawing shows a three-dimensional Cartesian coordinate system of XYZ, with the X axis representing the conveyance direction of the sheet roll by the bonding device, the Y axis representing the depth direction of the bonding device, and the Z axis representing the height direction of the bonding device.

[0016] 1 and 2 show a bonding device 100 according to one embodiment of the present invention. As shown in Fig. 1, the bonding device 100 is a device for bonding a tail portion T of a sheet roll R to the outer peripheral surface of the sheet roll R while transporting the sheet roll R from the upstream side (right side in the figure) to the downstream side (left side in the figure) of the bonding device 100. In this bonding device 100, the path of the sheet roll R forms a gentle downward slope overall from the upstream side to the downstream side.

[0017] The sheet roll R is, for example, a toilet roll or a kitchen roll. Specifically, the sheet roll R is formed into a cylindrical shape by winding multiple layers of sanitary paper S, made from wood pulp, around a core C. One end of the sanitary paper S is bonded to the core C, but the other end, which is the outermost layer, is not yet bonded anywhere. This other end of the sheet roll R is called the "tail portion T," and the bonding device 100 is used to bond this tail portion T to the outer peripheral surface of the sheet roll R.

[0018] Sanitary paper S is basically obtained by preparing a papermaking raw material (pulp slurry), which is a suspension of raw pulp fibers, and then weaving the raw pulp fibers from this papermaking raw material to form a fiber web and drying it. Pulp is the primary raw material for papermaking raw materials. Examples of raw pulp include kraft pulp (KP) made from wood, such as bleached hardwood kraft pulp (LBKP) and bleached softwood kraft pulp (NBKP); chemical pulp, such as sulfite pulp (SP) and soda pulp (AP); semi-chemical pulp, such as semi-chemical pulp (SCP) and chemi-ground wood pulp (CGP); mechanical pulp, such as groundwood pulp (GP) and thermomechanical pulp (TMP, BCTMP); non-wood pulp made from materials such as paper mulberry, mitsumata, hemp, and kenaf; cotton-based pulp, such as cotton linter and cotton lint; and deinked pulp made from recycled paper. Depending on the application and required performance of the tissue paper, the papermaking raw material may be made of one type of raw pulp or a mixture of multiple types of raw pulp in any ratio. The raw pulp may be unbeaten, or may be wholly or partially beaten.

[0019] In particular, in this embodiment, the sanitary paper S constituting the sheet roll R is preferably made from wood pulp such as bleached hardwood kraft pulp (LBKP) or bleached softwood kraft pulp (NBKP) as a papermaking raw material. Sanitary paper S made from wood pulp in this way is positively charged in the triboelectric series.

[0020] When two materials are rubbed together, one material is positively charged and the other negatively charged, generating static electricity. The order in which materials are most likely to be charged to each polarity is called the "triboelectric series." Which material is positively or negatively charged depends on the type of material. In the triboelectric series, materials that are most likely to be positively charged are listed, for example, asbestos, human hair, glass, mica, wool, nylon, rayon, lead, silk, cotton, linen, wood, glass fiber, zinc, and aluminum. In the triboelectric series, materials that are most likely to be negatively charged are listed, for example, silicone, fluororesins such as Teflon (registered trademark), polyvinyl chloride, cellophane, polyethylene, acrylic, polyester, polystyrene, gold, nickel, silver, copper, iron, Eponite, and chromium. When materials (materials) located farther apart in the triboelectric series are brought into contact with each other, stronger static electricity is generated.

[0021] As shown in FIG. 1 , an upstream table 10 is provided at the most upstream side of the bonding device 100, with a gentle downward slope. A sheet roll R, to which the tail portion T has not yet been bonded, is first placed on this upstream table 10. In this embodiment, the sheet roll R must be placed on the upstream table 10 so that when the sheet roll R is placed on the upstream table 10 with the point P of the tail portion T (i.e., the point where the end of the sanitary paper S leaves the circumference of the sheet roll R) facing downward, the tail portion T being pulled out from the sheet roll R extends along the plane of the upstream table 10 toward the downstream side of the bonding device 100. By placing the sheet roll R on the upstream table 10 in this manner, the tail portion T of the sheet roll R is more likely to adhere to the conveying surface 20, which has an adsorption function as described below. The sheet roll R placed on the upstream table 10 rolls downstream according to the slope of the upstream table 10.

[0022] As shown in FIG. 1, a conveying surface 20 formed by a suction conveyor 21 or the like is provided downstream of the upstream table 10. The suction conveyor 21 includes an endless perforated belt 21a with multiple ventilation holes formed all over it, and a head pulley 21b and a tail pulley 21c around which the perforated belt 21a is stretched. One of the head pulley 21b and the tail pulley 21c is a driving pulley that is actively rotated by a motor or the like, while the other is a driven pulley that is only passively rotated. In other words, the perforated belt 21a is rotated by the driving pulley, and the driven pulley rotates in conjunction with the rotation of the perforated belt 21a. The suction conveyor 21 is also equipped with a suction device 30. The suction device 30 includes, for example, a suction box 31 provided below the conveying surface of the perforated belt 21a, and a vacuum fan 32 is connected to the suction box 31. By starting the vacuum fan 32, the air inside the suction box 31 is sucked in, creating a negative pressure inside the suction box 31. When the suction box 31 becomes negative pressure, air is sucked in through the ventilation holes in the perforated belt 21a. This allows the suction conveyor 21 to suck in objects on the perforated belt 21a through the ventilation holes.

[0023] FIG. 2 also shows a plan view of the conveying surface 20 of the bonding device 100 in detail. As shown in FIG. 2, in this embodiment, the conveying surface 20 is formed by arranging multiple suction conveyors 21 and multiple sliding plates 22 alternately in the depth direction (Y-axis direction) of the bonding device 100. That is, the sliding plates 22 are installed between the suction conveyors 21. The sliding plates 22 are arranged to form a downward slope parallel to the suction conveyors 21. However, the sliding plates 22 are simply plate-like members that do not function as conveyors. Therefore, the sheet roll R slides on the sliding plates 22 as it is conveyed downstream by the suction conveyor 21. More specifically, the conveying surface 20 is formed by the sliding plates 22 and the downstream-advancing surface of the perforated belt 21a of the suction conveyor 21. The perforated belt 21a of the suction conveyor 21 has multiple air vents, and as described above, the sheet roll R is sucked by the suction device 30 through the air vents. On the other hand, the sliding plate 22 does not have any ventilation holes or the like, and is not provided with a suction device 30 or the like, so it does not have a suction function like the suction conveyor 21. As described above, in this embodiment, the conveying surface 20 has ventilation sections (perforated belts 21a) with a suction function and non-ventilation sections (sliding plates 22) without a suction function formed alternately in the depth direction.

[0024] In this embodiment, as shown in FIG. 2 , the conveying surface 20 is provided with a suction conveyor 21 having perforated belts 21a on both sides in the depth direction (Y-axis direction). To reliably prevent both ends (i.e., corners) of the tail portion of the sheet roll R from turning over, it is preferable to configure the conveying surface 20 so that the ends (corners) of the tail portion can be sucked. In this regard, it is preferable to configure the perforated belts 21a on both sides in the depth direction of the conveying surface 20. However, the present invention is not limited to this configuration, and a configuration in which slide plates 22 are provided on both ends in the depth direction (Y-axis direction) may also be used. For example, it is possible that the width of the sheet roll R may change due to production reasons or the like. In particular, if the width of the sheet roll R becomes shorter, one or both ends of the roll may not reach the perforated belts 21a. In consideration of such a case, the conveying surface 20 may be provided with slide plates 22 on both sides in the depth direction (Y-axis direction).

[0025] FIG. 3 shows a modified example of the embodiment shown in FIG. 2. As shown in FIG. 3, the perforated belt 21a of each suction conveyor 21 may have perforated portions 21a(1) and non-perforated portions 21a(2) alternately formed along the conveying direction (X-axis direction) of the sheet roll R. The perforated portions 21a(1) are areas formed with multiple ventilation holes connected to the suction device 30, and the non-perforated portions 21a(2) are areas without such ventilation holes. When comparing the case where the perforated belt 21a has the non-perforated portions 21a(2) (FIG. 3) with the case where the non-perforated portions 21a(2) are not provided (FIG. 2), when the suction device 30 is operated at the same suction volume, the case where the non-perforated portions 21a(2) are provided can increase the force of suctioning the sheet roll R through the ventilation holes. In this way, by adjusting the range of the non-ventilation portion 21a(2) provided in the perforated belt 21a, the amount of suction of the sheet roll R by the suction device 30 can be adjusted.

[0026] In this embodiment, the perforated belt 21a of each suction conveyor 21 is made of a material that is easily charged to the opposite polarity to the sheet roll R (more specifically, the sanitary paper S). That is, since the sanitary paper S is easily charged to the positive pole in the triboelectric series, the perforated belt 21a must be made of a material that is easily charged to the negative pole. In particular, since the perforated belt 21a is preferably strongly charged to the negative pole, it is recommended to use a material that is more easily charged to the negative pole than metal (specifically, gold) in the triboelectric series. Examples of materials that can be used to form the perforated belt 21a include polystyrene resin, polyester resin, acrylic resin, olefin resin, vinyl chloride resin, fluorine resin, and silicone resin. Examples of polystyrene resin include styrene resin and acrylonitrile butadiene styrene (ABS) resin. Examples of polyester resin include polyethylene terephthalate (PET) and polybutylene terephthalate (PBT). Examples of acrylic resins include polymethyl methacrylate (PMMA) and polyethyl acrylate. Examples of olefin resins include polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate copolymer (EVA), ethylene-vinyl acetate copolymer (EVM), chlorinated polyolefin, ethylene-propylene copolymer (EPM / EPDM), and ionomer resin. Examples of vinyl chloride resins include polyvinyl chloride resin (PVC) and vinyl acetate resin. Examples of fluorine resins include polytetrafluoroethylene (PTFE) (Teflon®) and polyvinylidene fluoride (PVDF). Examples of silicone resins include silicone rubber and silicone resin. Among these, since a small coefficient of friction is preferable for the perforated belt 21a, it is preferable to use an olefin resin such as polyethylene (PE) or polypropylene (PP), or a fluorine resin such as polytetrafluoroethylene (PTFE).

[0027] Like the perforated belts 21a, the sliding plates 22 provided adjacent to each suction conveyor 21 may be made of a material that is easily charged with a polarity opposite to that of the sanitary paper S. For example, the sliding plates 22 may be made of materials such as the aforementioned polystyrene resin, polyester resin, acrylic resin, olefin resin, vinyl chloride resin, fluorine resin, and silicone resin.

[0028] However, if the slide plate 22, which does not actively move, is too strongly negatively charged, the sheet roll R (especially the tail portion T) will have difficulty sliding on the slide plate 22 while being transported by the suction conveyor 21, which may cause wrinkles or kinks in the sheet roll R. For this reason, the slide plate 22 is not necessarily limited to a material that is strongly negatively charged. For this reason, the slide plate 22 may be formed from a material that is weaker in the electrification series than the perforated belt 21a. For example, the slide plate 22 may be formed from a known metal material such as aluminum, stainless steel, iron, copper, zinc, cobalt, or nickel.

[0029] In this way, at least the perforated belt 21a, or the perforated belt 21a and the sliding plate 22, are made of a material that is easily positively charged. As a result, by bringing the tail portion T of the sheet roll R into contact with the conveying surface 20 formed by the perforated belt 21a and the like, the tail portion T can be adsorbed to the conveying surface 20. If the tail portion T of the sheet roll R floats while traveling on the conveying surface 20, the tail portion T will become twisted or turned up, making it impossible to properly apply adhesive to fasten the tail portion T to the outer peripheral surface of the sheet roll R. In contrast, by adsorbing the tail portion T to the conveying surface 20 as in the present invention, the tail portion T is prevented from floating up, and adhesive can be properly applied in the subsequent process.

[0030] In the present invention, the tail portion T is attracted to the conveying surface 20 by utilizing static electricity generated between the sheet roll R and the conveying surface 20. For this reason, it is preferable not to apply antistatic treatment such as coating the conveying surface 20 with an antistatic agent.

[0031] As shown in FIG. 1, an upper conveyor 40 is provided above the suction conveyor 21 (and the sliding plate 22 hidden behind it). The upper conveyor 40 includes an endless belt 40a, and a head pulley 40b and a tail pulley 40c around which the belt 40a is stretched. One of the head pulley 40b and the tail pulley 40c is a drive pulley that is actively rotated by a motor or the like, while the other is a driven pulley that is only passively rotated. The sheet roll R that has passed the upstream table 10 comes into contact with both the perforated belt 21a of the suction conveyor 21 and the belt 40a of the upper conveyor 40, and is transported downstream while sandwiched between these belts 21a and 40a. Furthermore, the entire upper conveyor 40 extends further downstream than the suction conveyor 21 (and the sliding plate 22 hidden behind it), and the head pulley 40b located at the tip of the upper conveyor 40 is located above the application roller 70 described later.

[0032] The rotation speed of the upper conveyor 40 is slightly slower than that of the suction conveyor 21. Therefore, the sheet roll R sandwiched between the upper conveyor 40 and the suction conveyor 21 rotates gently in the opposite direction, and as a result, the tail portion T of the sheet roll R is drawn out so as to extend downstream while being sucked by the suction conveyor 21. Therefore, as shown in Figure 2, the tail portion T advances on the conveying surface 20 ahead of the main body of the sheet roll R (the portion where the sanitary paper S is wound around the core C).

[0033] As shown in FIG. 1, a gluing device 50 is provided downstream of the suction conveyor 21. The gluing device 50 has a container 51 filled with adhesive and a blade 52 for applying the adhesive in the container 51 to the outer peripheral surface of the sheet roll R. The blade 52 has a length equal to the axial length of the sheet roll R, and can apply adhesive in a line to the outer peripheral surface of the sheet roll R. The blade 52 is configured to move back and forth between a position inside the container 51 where it is immersed in the adhesive and a position outside the container 51 where it contacts the sheet roll R. Note that a known actuator (not shown) may be used to move the blade 52 back and forth.

[0034] A gap 53 for drawing in the tail portion T is formed between the downstream end of the suction conveyor 21 and the container 51 of the gluing device 50. As shown in FIG. 1 , when the sheet roll R is conveyed downstream while sandwiched between the suction conveyor 21 and the upper conveyor 40, the tail portion T drawn from the sheet roll R is sucked by the suction conveyor 21 and drawn between the suction conveyor 21 and the container 51. While the tail portion T is being drawn into the gap 53, the blade 52 of the gluing device 50 moves from the container 51 toward the outer peripheral surface of the sheet roll R, and the adhesive in the container 51 is applied linearly to the outer peripheral surface of the sheet roll R. In FIG. 1 , the adhesive application position on the outer peripheral surface of the sheet roll R is indicated by the symbol A. The adhesive application position A is a position on the outer peripheral surface of the sheet roll R that corresponds to the inside of the tail portion T. In other words, the adhesive application position A is the position that is exposed when the tail portion T is rolled up from the sheet roll R, and when the tail portion T is returned to the outer periphery of the sheet roll R, the tail portion T is adhered by the adhesive.

[0035] After the adhesive is applied by the gluing device 50, the sheet roll R stops being conveyed by the suction conveyor 21 and is rolled downstream by the upper conveyor 40 located above it. A relay table 60 is provided downstream of the gluing device 50, and a laminating roller 70 is provided further downstream of that. The sheet roll R rolling downstream on the relay table 60 is sandwiched between the upper conveyor 40 and the laminating roller 70. As shown in FIG. 1 , the laminating roller 70 rotates in a direction that rolls the sheet roll R back upstream. That is, the laminating roller 70 rotates in the same direction as the head pulley 40b of the upper conveyor 40. Therefore, by sandwiching the sheet roll R between the laminating roller 70 and the upper conveyor 40, the tail portion T of the sheet roll R is pressed against the adhesive adhering to the outer circumferential surface of the sheet roll R, thereby further strengthening the adhesion of the tail portion T.

[0036] When the sheet roll R passes the laminating roller 70, transportation by the upper conveyor 40 also ends. A downstream table 80 is provided downstream of the laminating roller 70, and the sheet roll R, after having its tail portion T adhered, is discharged onto the downstream table 80. The sheet roll R discharged onto the downstream table 80 is cut to a predetermined length to produce sanitary paper products such as toilet rolls and kitchen rolls.

[0037] In the bonding device 100 according to this embodiment, the perforated belt 21a of the suction conveyor 21 is charged to a polarity opposite to that of the sheet roll R, so that the tail portion T of the sheet roll R is attracted to the conveying surface 20 including the perforated belt 21a not only by the suction action of the suction device 30 but also by static electricity. Then, while maintaining the state in which the tail portion T is attracted to the conveying surface 20, an adhesive is applied to the outer peripheral surface of the sheet roll R. This makes it possible to properly fix the tail portion T to the outer peripheral surface of the sheet roll R with the adhesive while preventing the tail portion T from curling up.

[0038] As described above, in this embodiment, static electricity is intentionally generated between the sheet roll R and the conveying surface 20. Since static electricity is more likely to be generated in a low-humidity environment, a dehumidifier (not shown) may be used to dehumidify the space in which the entire bonding device 100 is placed, or at least the space in which the suction conveyor 21 and the gluing device 50 are placed. The dehumidifier preferably maintains the relative humidity of the space at 40% or less, and particularly preferably at 35% or less or 30% or less, during operation of the bonding device 100.

[0039] In the above embodiment, the suction conveyor 21 and the sliding plate 22 are arranged side by side, but the sliding plate 22 may be omitted and the conveying surface 20 may be formed by a suction conveyor 21 having a single wide perforated belt 21a. In such a case, it is preferable to provide a ventilation section 21a(1) and a non-ventilation section 21a(2) and to achieve an electrostatic adsorption effect in the non-ventilation section 21a(2) area.

[0040] In the above description of the present invention, the embodiments of the present invention have been described with reference to the drawings in order to express the contents of the present invention. However, the present invention is not limited to the above embodiments, and includes modifications and improvements that are obvious to those skilled in the art based on the matters described in the present specification. [Explanation of symbols]

[0041] 10...Upstream table 20...Transport surface 21...Suction conveyor 21a...Perforated belt 21a(1)...Ventilated section 21a(2)...Non-ventilated section 21b...Head pulley 21c...Tail pulley 22...Sliding plate 30...Suction device 31...Suction box 32...Vacuum fan 40...Upper conveyor 40a...Belt 40b...Head pulley 40c...Tail pulley 50...Gluing device 51...Container 52...Blade 53...Gap 60...Relay table 70...Laminating roller 80...Downstream table 100...Bonding device R...Sheet roll C...Corner S: Sanitary paper T: Tail part

Claims

1. A bonding device that bonds a tail portion of a sheet roll to an outer peripheral surface of the sheet roll, a conveying means for conveying the sheet roll; an adsorption means for adsorbing the tail portion onto a conveying surface of the sheet roll in the conveying means; a gluing device that applies adhesive to an outer peripheral surface of the sheet roll located inside the tail portion while the tail portion is being attracted to the conveying surface by the suction means; a bonding device that bonds the tail portion to the adhesive applied to the sheet roll, The adsorption means includes the conveying surface charged with a polarity opposite to that of the sheet roll. Gluing device.

2. the conveying surface has a ventilation portion and a non-ventilation portion formed thereon, The suction means further includes a suction device that sucks the tail portion through the ventilation portion of the conveying surface. The bonding device of claim 1 .

3. With the tail portion inserted into the gap between the conveying means and the gluing device, the gluing unit applies adhesive to the outer peripheral surface of the sheet roll. The bonding device of claim 1 .

4. The apparatus further includes a dehumidifying device for dehumidifying at least the space in which the conveying means and the gluing device are provided. The bonding device of claim 1 .

5. The transport means is a conveyor. The bonding device of claim 1 .

6. A method for manufacturing a sheet roll having a tail portion bonded to an outer peripheral surface, comprising: conveying the sheet roll downstream by a conveying means; a step of adsorbing the tail portion of the sheet roll onto a conveying surface of the conveying means; applying an adhesive to an outer peripheral surface of the sheet roll located inside the tail portion while the tail portion is being attracted to the conveying surface; a step of attaching the tail portion to the adhesive applied to the sheet roll, The tail portion is attracted to the conveying surface because the conveying surface is charged with a polarity opposite to that of the sheet roll. A method for manufacturing sheet rolls.

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