JP2013202139A - Paper dust removing apparatus, and method of manufacturing sanitary paper using the paper dust removing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper dust removing apparatus which has a compact and low-cost configuration and is capable of surely removing paper dust stuck to both sides of sanitary paper, and a method of manufacturing sanitary paper using the paper dust removing apparatus.SOLUTION: An air discharge port 11 is provided on one side of a conveyance path of sanitary paper, an air suction port 21 is provided on the other side of the conveyance path, and air blown from the air suction port 11 to one side of the sanitary paper is sucked from the other side of the sanitary paper by the air suction port 21 through the sanitary paper.

Description

  The present invention relates to a paper dust removing device for removing paper dust adhering to sanitary paper, and a method for producing sanitary paper using the paper dust removing device. More specifically, the paper dust removing device of the present invention removes paper dust adhering to sanitary paper by an air discharge part capable of discharging air and an air suction part capable of sucking air.

  Conventionally, in the manufacturing process of sanitary paper such as tissue paper and toilet paper, a paper dust removal device has been used to prevent paper dust from falling from the paper surface when, for example, consumers use sanitary paper. , Paper dust adhering to sanitary paper is removed.

  This type of paper dust removing device is provided with an air discharge port and an air suction port facing the surface of the continuous paper on one side of the continuous paper conveyance path, and air is discharged from the air discharge port on one side of the continuous paper. It is known that paper dust is released from the paper surface of continuous paper by discharging the paper powder, and the paper dust released from the paper surface of the continuous paper is sucked from the air suction port to remove the paper dust (patent) Document 1, Patent document 2).

  In addition, as a paper dust removing device, a round bar-shaped guide body that is wound around continuous paper and changes the transport direction of the continuous paper is made hollow, and a suction port is formed on the outer peripheral surface of the guide body, thereby There is known one that removes the paper dust adhering to the paper surface by suction from the suction port (Patent Document 3).

JP 2002-200591 A JP 2007-22710 A JP 2006-219208 A

  However, in order to remove paper dust adhering to both sides of the continuous paper using the paper dust removing device disclosed in Patent Literature 1 and Patent Literature 2, corresponding to each side of the continuous paper, Each had to have an air discharge port and air suction port, which required not only a large installation space, but also increased the number of parts and increased the cost.

  Moreover, in order to remove the paper dust adhering to both surfaces of the continuous paper using the paper dust removing device disclosed in Patent Document 3, it is only necessary to provide at least two guide bodies having suction ports. In addition, there is a problem that it is necessary to set the transport path of the continuous paper so that each surface of the continuous paper is in contact with the outer peripheral surface of each guide body, which requires a large installation space. In addition, the paper dust removing device of Patent Document 3 can remove the paper dust of the portion corresponding to the suction port of the guide body among the paper dust attached to the continuous paper, but removes the paper dust of the other portions. There is a problem that the paper dust adhering to the continuous paper cannot be removed reliably.

  Therefore, at present, there is a need for a paper dust removing device that can reliably remove paper dust adhering to both surfaces of a sanitary paper and a method for producing sanitary paper using the paper dust removing device with a compact and low-cost configuration. ing.

Therefore, the inventors of the present invention have intensively studied the means for solving the above-described problems of the conventional invention. The air blown from the air outlet to one side of the sanitary paper is sucked from the other side of the sanitary paper through the sanitary paper and is attached to both sides of the sanitary paper. We have obtained knowledge that paper dust can be removed reliably with a compact and low-cost configuration. Then, the present inventors have conceived that the problems of the prior art can be solved based on the above knowledge, and have completed the present invention.
Specifically, the present invention has the following configuration.

The 1st side surface of this invention is related with the paper dust removal apparatus 1 for removing the paper dust adhering to sanitary paper.
The paper dust removing apparatus 1 includes an air discharge unit 10 that can discharge air and an air suction unit 20 that can suck air.
The air discharge unit 10 has an air discharge port 11 at a position facing one paper surface of the sanitary paper on one side of the sanitary paper transport path.
The air suction unit 20 has an air suction port 21 at a position opposite to the other surface of the sanitary paper on the other side of the sanitary paper transport path.
The air discharge port 11 and the air suction port 21 are provided at positions facing each other across the sanitary paper conveyance path.
And the paper dust removal apparatus 1 removes the paper dust adhering to a sanitary paper by attracting | sucking the air discharged from the air discharge port 11 from the air suction opening 21 through a sanitary paper.

As described above, at least the air discharge port 11 and the air suction port 21 are provided at positions facing each other across the sanitary paper conveyance path, and the paper dust is removed so that the air passes through the sanitary paper. By providing only one air discharge port 11 and one air suction port 21, paper dust adhering to both surfaces of the sanitary paper can be removed.
Further, in the paper dust removing device of the present invention, the air discharge unit 10 blows air against the surface of the sanitary paper through the air discharge port 11, so that the blown air is sucked into the air. By sucking the air suction unit 20 through the mouth 21, paper dust attached to the entire sanitary paper can be reliably removed.
Furthermore, since the present invention removes paper dust by allowing air to pass through the sanitary paper, when the sanitary paper is composed of a plurality of plies, the paper dust interposed between the layers of the sanitary paper is removed. Can also be removed.

  In the paper dust removing apparatus of the present invention, the air discharge port 11 is preferably provided below the sanitary paper horizontal conveyance path, and the air suction port 21 is preferably provided above the sanitary paper horizontal conveyance path. .

  By providing the air discharge port 11 below the horizontal conveyance path of the sanitary paper as in the above configuration, for example, even paper dust adhered to the paper surface on the air discharge port 11 side is between the constituent fibers of the sanitary paper. If it is fine enough to pass through, it can be removed by being pushed out by air and sucked from the air suction port 21 provided on the opposite side. Even when paper dust having a size that does not pass between the fibers of the sanitary paper is attached to the paper surface on the air ejection port 11 side, the air ejection port 11 is routed through the sanitary paper horizontal conveyance path. By providing air on the lower side and blowing air, large paper dust can be separated from the surface of the sanitary paper and dropped downward in the vertical direction according to gravity. For this reason, according to the said structure, the paper dust adhering to both surfaces of the sanitary paper can be removed more reliably.

  The paper dust removing device of the present invention preferably further includes a static elimination unit 30 for neutralizing static electricity charged on the sanitary paper on the upstream side of the conveyance path of the air discharge port 11 and the air suction port 21.

  By providing the static elimination unit 30 upstream of the air discharge port 11 and the air suction port 21 as in the above configuration, paper dust attached to sanitary paper due to the influence of static electricity can be separated from the paper surface. For this reason, by providing the static elimination part 3, paper dust adhering to a sanitary paper can be removed more reliably.

  In the paper dust removing device of the present invention, the charge eliminating unit 30 is preferably a charge eliminating brush that contacts the surface of sanitary paper.

  As in the above configuration, static electricity is removed by bringing the neutralization brush into contact with the paper surface of the sanitary paper, and at the same time, the static electricity charged on the paper dust is removed, and at the same time, the paper dust adhering to the sanitary paper is scraped off and removed be able to. For this reason, paper dust adhering to sanitary paper can be removed more reliably.

The second aspect of the present invention relates to a method for producing sanitary paper using the paper dust removing device according to the first aspect.
The manufacturing method of the present invention includes a step of removing paper dust adhering to sanitary paper by the paper dust removing device 1 according to the first aspect;
It is preferable to include a step of superimposing the sanitary paper by the overlapping unit 2 that superimposes the sanitary paper in a plurality of layers after removing the paper dust.

  By manufacturing sanitary paper according to the above configuration, paper dust can be reliably removed, and a sanitary paper laminated without paper dust staying between layers can be obtained.

The manufacturing method of the present invention includes a step of removing paper dust adhering to sanitary paper by the paper dust removing device 1 according to the first aspect;
It is preferable to include a step of printing on the sanitary paper by the printing unit 3 that prints on the sanitary paper after removing the paper dust.

  Printing on the sanitary paper becomes clearer by printing on the surface of the sanitary paper after removing the paper dust as in the above process.

The manufacturing method of the present invention includes a step of removing paper dust adhering to sanitary paper by the paper dust removing device 1 according to the first aspect;
It is preferable to include a step of applying the moisturizing agent to the sanitary paper by the moisturizing agent applying unit 4 that applies the moisturizing agent to the sanitary paper after removing the paper dust.

  The moisturizing agent can be applied without waste or unevenness by applying the moisturizing agent to the sanitary paper after removing the paper dust as in the above process.

  In the present invention, the air discharge port 11 and the air suction port 21 are provided at positions facing each other across the transport path of the sanitary paper, and the paper dust is removed so that the air passes through the sanitary paper. By providing only one air discharge port 11 and one air suction port 21, paper dust adhering to both surfaces of the sanitary paper can be removed. Therefore, according to the present invention, a paper dust removing device having a compact and low-cost configuration can be provided.

  In the present invention, since the air discharge unit 10 blows air against the surface of the sanitary paper through the air discharge port 11, the blown air is sucked through the air suction port 21. By sucking with the unit 20, paper dust adhering to the entire surface of the sanitary paper can be removed. Therefore, according to this invention, the paper dust adhering to both surfaces of sanitary paper can be removed reliably.

FIG. 1 is a conceptual diagram showing a paper dust removing apparatus according to the present invention. FIG. 2 is a block diagram showing a first embodiment of a sanitary paper manufacturing method using the paper dust removing apparatus according to the present invention. FIG. 3 is a block diagram showing a second embodiment of a sanitary paper manufacturing method using the paper dust removing apparatus according to the present invention. FIG. 4 is a block diagram showing a third embodiment of a sanitary paper manufacturing method using the paper dust removing apparatus according to the present invention.

  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, but includes those appropriately modified by those skilled in the art from the following embodiments.

(1. Paper dust removal device)
FIG. 1 is a conceptual diagram showing the configuration of the paper dust removing apparatus of the present invention. The paper dust removing device 1 is used, for example, for the purpose of removing paper dust adhering to the sanitary paper P that runs continuously. In FIG. 1, the conveyance direction of the sanitary paper P is indicated by an arrow. The sanitary paper from which paper dust is removed is not particularly limited, but examples of sanitary paper include tissue paper, toilet paper, kitchen towel, and dust paper. Further, the paper dust removing apparatus 1 of the present invention can remove paper dust adhering to the paper surface not only for one-ply sanitary paper but also for a plurality of ply (for example, 2-4 ply) sanitary paper.

  As shown in FIG. 1, the paper dust removing apparatus 1 includes an air discharge unit 10 that can discharge air, an air suction unit 20 that can suck air, and a charge removal unit that removes static electricity charged on sanitary paper. 30.

The air discharge unit 10 includes an air discharge port 11, an electric blower 12, and a discharge pipe 13.
The air discharge port 11 is connected to the electric blower 12 via the discharge pipe 13, and blows the air sent by the electric blower 12 against the surface of the sanitary paper P. In the present embodiment, the air discharge port 11 is provided vertically below the horizontal conveyance path of the sanitary paper P that travels horizontally, and blows air against the lower surface of the sanitary paper P. The width of the area where air is blown by the air discharge port 11 is configured to be substantially the same as or larger than the width of the sanitary paper P, and the sanitary paper P travels along the transport direction. Then, it is preferable that air blows over the entire width of the sanitary paper. In addition, for example, by attaching a nozzle component to the tip of the air discharge port 11 and narrowing the opening of the nozzle component, pressurized air may be discharged from the nozzle attached to the air discharge port 11. In order to efficiently blow the air discharged from the air discharge port 11 against the sanitary paper P, the tip of the air discharge port 11 (the front end of the nozzle when a nozzle is attached) to the paper surface of the sanitary paper P is used. The distance is preferably 1 mm to 100 mm, 10 mm to 80 mm, or 20 mm to 60 mm, for example.

  The electric blower 12 rotates the fan, for example, by driving a motor, sucks the outside air, and sends the sucked outside air into the discharge pipe 13. By adjusting the number of rotations of the motor in the electric blower 12, the discharge pressure of air discharged from the air discharge port 11 can be adjusted. The discharge pressure of air discharged from the air discharge port 11 is preferably about 1.5 kPa to 5.5 kPa, 2 kPa to 5 kPa, or 2.5 kPa to 4.5 kPa, for example. However, the discharge pressure of air depends on the property (for example, basis weight, thickness, or material) of the sanitary paper P for removing paper dust, the distance from the tip of the air discharge port 11 to the surface of the sanitary paper P, etc. It can be adjusted appropriately.

  The discharge pipe 13 is an element for connecting the air discharge port 11 and the electric blower 12, and a known duct or hose having airtightness may be used.

The air suction unit 20 includes an air suction port 21, an electric suction machine 22, a dust collector 23, and a suction pipe 24.
The air suction port 21 is connected to the electric suction machine 22 via the suction pipe 24 and sucks outside air by setting the inside of the suction pipe 24 to a negative pressure. In the present embodiment, the air suction port 21 is located vertically above the horizontal conveyance path of the sanitary paper P traveling horizontally, and is provided at a position facing the air discharge port 11 across the horizontal conveyance path. . For this reason, when the air discharged from the air discharge port 11 passes through the sanitary paper P, the transmitted air is sucked from the air suction port 21. The width of the area where air is sucked by the air suction port 21 is preferably configured to be substantially the same as the width of the sanitary paper P or larger than the width of the sanitary paper P. Further, in order to efficiently suck the air that has passed through the sanitary paper P through the air suction port 21, the distance from the tip of the air suction port 21 to the paper surface of the sanitary paper P is, for example, 1 mm to 100 mm, 10 mm to 10 mm. The thickness is preferably 80 mm, or 20 mm to 60 mm.

  The electric suction machine 22 has one side connected to the air suction port 21 via the suction pipe 24 and the other side connected to the dust collector 23 via the suction pipe 24. The electric suction machine 22 rotates a fan by driving a motor, for example, sucks outside air from the air suction port 21, and sends the sucked outside air to the dust collector 23. As a result, the paper dust taken together with the outside air from the air suction port 21 is sent to the dust collector 23 via the suction pipe 24. Further, the suction pressure of air sucked from the air suction port 21 can be adjusted by adjusting the number of rotations of the motor in the electric suction machine 22. The suction pressure of the air sucked from the air suction port 21 is preferably about 1.5 kPa to 5.5 kPa, 2 kPa to 5 kPa, or 2.5 kPa to 4.5 kPa, for example. However, the air suction pressure depends on the nature of the sanitary paper P from which paper dust is removed (for example, basis weight, thickness, or material), the distance from the tip of the air suction port 21 to the surface of the sanitary paper P, etc. It can be adjusted appropriately.

  The dust collector 23 collects paper dust contained in the air sent into the suction pipe 24 by the electric suction machine 22. A well-known thing can be employ | adopted as the dust collector 23, for example, a gravity dust collector, an inertia dust collector, a cyclone, a bag filter, or an electric dust collector can be used.

  The suction pipe 24 is an element for connecting the air suction port 21 and the electric suction machine 22, and the electric suction machine 22 and the dust collector 23, and a known duct or hose having airtightness may be used. Further, the suction pipe 24 may be provided with a damper capable of adjusting the air flow by changing the cross-sectional area of the suction pipe to adjust the suction pressure of the air sucked from the air suction port 21. .

  As shown in FIG. 1, the static elimination unit 30 is provided on the upstream side of the air discharge port 11 and the air suction port 21 in the transport path of the sanitary paper P. In particular, it is preferable that the static eliminating unit 30 is provided on the side of the sanitary paper conveyance path where the air suction port 21 is provided and facing the paper surface of the sanitary paper. The neutralization unit 30 may be configured to neutralize the charge of the sanitary paper P. For example, the neutralization unit 30 may be in contact with the sanitary paper P to neutralize the electric charge, or may not contact the sanitary paper P by self-discharge. It is also possible to remove the charge. For example, a static elimination brush can be adopted as the static elimination means 30 that performs static elimination by contacting the sanitary paper P. On the other hand, an ionizer can be adopted as the charge eliminating means 30 for eliminating charges without contact with the sanitary paper P. The ionizer is, for example, a device that applies a DC high voltage or an AC high voltage from a high voltage generation unit to an electrode needle to cause corona discharge and generates positive or negative ions by the electrode needle. The ionizer can bring the amount of charge on the sanitary paper closer to zero by spraying the generated ions onto the sanitary paper.

  In the present embodiment, the static elimination unit 30 is a static elimination brush. The static elimination brush 30 includes a base 31 having substantially the same width as the sanitary paper P, and a brush part 32 implanted in a fibrous form on the base 31. ing. The width of the region where the brush portion 32 is provided is configured to be substantially the same as the width of the sanitary paper P or larger than the width of the sanitary paper P. It is preferable that the brush portion 32 is configured to contact over the entire width of the paper. In the static elimination brush 30, at least the brush part 32, preferably both the base 31 and the brush part 32 are made of a conductive material. For example, the base 31 is made of a conductive material such as aluminum or stainless steel (SUS), and the brush portion 32 is a conductive material such as styrene, olefin, vinyl chloride, urethane, polyester, or polyamide. What is necessary is just to form with the thermoplastic elastomer resin which provided the property.

Then, with reference to FIG. 1, the principle of operation of the paper dust removal apparatus 1 which has the said structure is demonstrated.
Paper dust is usually attached to the continuous sanitary paper P. In FIG. 1, paper dust is conceptually shown as a circle with light ink. When the sanitary paper P is transported in the transport direction (from the right to the left in the drawing), it first contacts the brush portion 32 of the static elimination brush 30. For this reason, the static elimination brush 30 removes static electricity charged on the sanitary paper P and scrapes the paper dust adhering to the paper surface of the sanitary paper P. As a result, the paper dust adhering to the sanitary paper P is released from the paper surface or is easily released from the paper surface.

  On the downstream side of the static elimination brush 30, the air discharge port 11 that faces the lower surface of the sanitary paper P and the air suction port 21 that faces the upper surface of the sanitary paper P are opposed to each other across the transport path of the sanitary paper P. Is provided. That is, the air discharge port 11 and the air suction port 21 are provided at positions orthogonal to the plane of the sanitary paper P.

  The air discharge port 11 discharges air sent from the electric blower 12 through the discharge pipe 13. The air discharged from the air discharge port 11 rises upward according to the direction of the air discharge port 11. Since the conveyance path of the sanitary paper P is located above the air discharge port 11, the air discharged from the air discharge port 11 is blown onto the lower surface of the sanitary paper P. The air blown onto the sanitary paper P is transmitted from the lower surface to the upper surface of the sanitary paper P. At this time, when paper dust adheres to the lower surface side of the sanitary paper P, if the paper dust is smaller and finer than between the constituent fibers of the sanitary paper P, the paper dust is blown into the blown air. At the same time, it passes through the sanitary paper P and is sent to the upper surface. Further, even when the paper dust adhering to the lower surface side of the sanitary paper P is larger than the constituent fibers of the sanitary paper P, the sanitary paper is blown by the pressure of the air blown on the sanitary paper P. Detach from the lower surface of P and fall downward in the vertical direction according to gravity. Further, when paper dust adheres to the upper surface side of the sanitary paper P, the paper dust is pushed out by the air blown from below and lifts away from the upper surface of the sanitary paper P.

  Further, an air suction port 21 is located above the conveyance path of the sanitary paper P. The air suction port 21 sucks the air discharged from the air discharge port 11 and passing through the sanitary paper P. Since the air discharged from the air discharge port 11 includes paper dust adhered to the lower surface side of the sanitary paper P and paper dust adhered to the upper surface side of the sanitary paper P, the air suction port By sucking air containing paper dust through 21, paper dust can be removed from the surface of the sanitary paper P. The electric suction machine 22 sends the air sucked from the air suction port 21 to the dust collector 23 via the suction pipe 24. The dust collector 23 collects paper dust contained in the air and accumulates it at a predetermined location. For this reason, by discarding the paper dust accumulated by the dust collector 23, the paper dust can be easily and reliably removed.

As described above, the paper dust removing device 1 of the present invention removes paper dust by allowing the air discharged from the air discharge port 11 to pass through the sanitary paper P and sucked by the air suction port 21. . For this reason, the paper dust removing apparatus 1 can be suitably used for the purpose of removing paper dust from the sanitary paper P having air permeability. For example, sanitary paper such as tissue paper, toilet paper, kitchen towel, or dust paper is usually air permeable, so the paper dust removing device 1 can be used to remove paper dust from these sanitary paper. it can. More specifically, sanitary paper paper dust removal target had a basis weight of 10 to 50 g / ^{m 2,} or 20 to 40 g / ^{m 2,} the total thickness of the paper 80 to 200 .mu.m, or 100~160μm (40 ˜100 μm / 1 sheet, 50-80 μm / 1 sheet).

As mentioned above, although preferable embodiment of the paper dust removal apparatus which concerns on this invention was described, the paper dust removal apparatus of this invention is not limited to the said embodiment.
For example, the paper dust removing device discharges air from the air discharge port 11 provided on the upper side of the sanitary paper conveyance path and sucks air from the air suction port 21 provided on the lower side of the conveyance path, You may remove paper dust.
Further, the paper dust removing device is not limited to the above configuration in which the air discharge port 11 and the air suction port 21 are provided at positions facing each other across the horizontal conveyance path of the sanitary paper. For example, the paper dust removing device is provided with the air discharge port 11 so as to face one paper surface of the sanitary paper even when the transport path of the sanitary paper P is inclined at a predetermined angle with respect to the horizontal direction. By providing the air suction port 21 so as to face the other surface of the sanitary paper, it is possible to remove paper dust.

(2. Manufacturing method of sanitary paper using paper dust removing device)
Next, a method for manufacturing sanitary paper using the paper dust removing apparatus 1 having the above configuration will be described.

(2-1. First Embodiment of Manufacturing Method)
FIG. 2 is a block diagram illustrating an apparatus for executing the sanitary paper manufacturing method according to the first embodiment. In FIG. 2, the sanitary paper P is conveyed from the upstream side of the right device toward the downstream side of the left device. The manufacturing method according to the first embodiment can be applied to a method for manufacturing tissue paper, for example.
As shown in FIG. 2, a first original fabric roll 51 and a second original fabric roll 52 are located upstream of the apparatus. A long first base paper P1 is wound around the first raw roll 51, and a long second base paper P2 is wound around the second raw roll 52. When the first raw paper P1 and the second raw paper P2 are fed out from the first raw paper roll 51 and the second raw paper roll 52 via the guide roller 53, the first raw paper P1 and the second raw paper P2 is superposed on each other in the superposition unit 2 (superposition roller). Here, the multi-layer sheet in which the first base paper P1 and the second base paper P2 are overlapped is referred to as sanitary paper P. The sanitary paper P is transported to the apparatus downstream side according to the transport direction.

  A calendar unit 54 is located downstream of the apparatus of the overlapping unit 2. The calendar unit 54 adjusts the tension and linear pressure of the web by sandwiching and pressing the sanitary paper P by, for example, one metal roller 54a and one elastic roller 54b. And calendar processing to give softness.

  A first paper dust removing device 1 a is located downstream of the calendar unit 54. Here, in the region where the first paper dust removing device 1a is provided, by adjusting the positions of the guide rollers 53 located on the upstream side and the downstream side of the first paper dust removing device 1a, It is preferable that the conveyance path is kept horizontal. When the sanitary paper P is conveyed to the downstream side of the apparatus, first, the static elimination brush 30a (static elimination unit) removes static electricity and scrapes the paper powder adhering to the paper surface. In addition, it replaces with the static elimination brush 30a, and a well-known ionizer can also be employ | adopted. Here, in the first embodiment, the first paper dust removing device 1a is provided above the horizontal conveyance path of the sanitary paper P on the downstream side of the static eliminating brush 30a. Air is sent from the outlet 11a through the discharge pipe 13a by driving the electric blower 12a. The air blown from the air discharge port 11a onto the upper surface of the sanitary paper P passes through the sanitary paper P and is provided below the horizontal transport path of the sanitary paper P from the air suction port 21a facing the lower surface of the sanitary paper P. Sucked. When air containing paper dust is sucked by the air suction port 21a, the sucked air is sent to the dust collector 23a via the suction pipe 24a by driving the electric suction device 22a. As described above, the paper dust removing apparatus has a configuration in which the air discharge port 11a is provided above the horizontal conveyance path of the sanitary paper P, and the air suction port 21a is provided below the horizontal conveyance path of the sanitary paper P. May be. The paper dust produced on the sanitary paper P by the calendar process is removed by the first paper dust removing device 1a.

  The printing unit 3 is located downstream of the first paper dust removing device 1a. The printing unit 3 performs processing for printing on the sanitary paper P. As the printing unit 3, for example, a known rotary printing application device can be employed. For example, the printing unit 3 includes a printing drum 3a and a plurality of printers 3a and 3b arranged on the circumference of the printing drum 3a. The printing unit 3 sequentially applies printing ink to the sanitary paper P conveyed by the plurality of printers 3a and 3b while winding the sanitary paper P around the printing drum 3a. The printing process by the printing unit 3 is performed immediately after the paper dust removing process by the first paper dust removing device 1a, and there is almost no paper dust remaining on the paper surface of the sanitary paper P, and the influence of the paper dust is affected. Because it does not receive, clear printing can be performed.

  A second paper dust removing device 1b is located downstream of the printing unit 3. The configuration of the second paper dust removing device 1b is different from the configuration of the first paper dust removing device 1a, the air discharge port 11b is provided below the horizontal conveyance path of the sanitary paper P, and the air suction port 21b is sanitary. It is provided above the horizontal conveyance path of the paper P. That is, when the sanitary paper P is transported to the downstream side of the apparatus, first, the static elimination brush 30b (static elimination unit) removes static electricity and scrapes the paper dust adhering to the paper surface. On the downstream side of the static eliminating brush 30b, the second paper dust removing device 1b is provided below the horizontal conveyance path of the sanitary paper P, and from the air discharge port 11b facing the lower surface of the sanitary paper P through the discharge pipe 13b. Thus, air is fed by driving the electric blower 12b. The air blown from the air discharge port 11b to the lower surface of the sanitary paper P passes through the sanitary paper P and is provided above the horizontal transport path of the sanitary paper P from the air suction port 21b facing the upper surface of the sanitary paper P. Sucked. When air containing paper dust is sucked by the air suction port 21b, the sucked air is sent to the dust collector 23b through the suction pipe 24b by driving the electric suction machine 22b. As described above, the second paper dust removing device 1b can remove the paper dust generated on the surface of the sanitary paper P by the printing process by the printing unit 3. Further, by providing the second paper dust removing device 1b on the downstream side of the printing unit 3, the ink applied by the printing unit 3 using the air discharged and sucked by the second paper dust removing device 1b. Can promote the drying of. As will be described later, the moisturizing agent applying unit 4 is located downstream of the second paper dust removing device 1b, but the second paper dust removing device is interposed between the printing unit 3 and the moisturizing agent applying unit 4. By providing 1b and promoting drying of the ink, it is possible to prevent the ink from bleeding when the humectant is applied to the sanitary paper P.

  In the first embodiment, as shown in FIG. 2, the direction of the air blown to the sanitary paper P by the first paper dust removing device 1a and the sanitary paper P by the second paper dust removing device 1b. The ventilation direction of the air blown on the top and bottom of the sanitary paper P is reversed up and down across the horizontal conveyance path. By arranging the first paper dust removing device 1a and the second paper dust removing device 1b in this way, air can be blown against the upper surface and the lower surface of the sanitary paper P, respectively. Therefore, the paper dust adhering to the upper surface and the lower surface of the sanitary paper P can be more reliably removed.

In the example shown in FIG. 2, the electric blower 12a connected to the air discharge port 11a of the first paper dust removing device 1a and the air discharge port 11b of the second paper dust removing device 1b are connected. The electric blower 12b is provided separately. However, the air discharge port 11a of the first paper dust removing device 1a and the air discharge port 11b of the second paper dust removing device 1b are connected to the same electric blower via the same discharge pipe. It is good.
Similarly, in the example shown in FIG. 2, the electric suction machine 22a connected to the air suction port 21a of the first paper dust removing device 1a and the air suction port 21b of the second paper dust removing device 1b are connected. The electric blower 22b thus provided is provided separately. However, the air suction port 21a of the first paper dust removing device 1a and the air suction port 21b of the second paper dust removing device 1b are connected to the same electric suction machine via the same suction pipe. It is good also as a structure.
In this way, by using the electric blower and the electric suction machine in common by the plurality of paper dust removing devices 1a and 1b, the sanitary paper manufacturing device can be made compact and cost-effective.

  A humectant application unit 4 is located downstream of the second paper dust removing device 1b. The humectant application unit 4 performs a process of applying a humectant to the sanitary paper P. The humectant application unit 4 includes, for example, a transfer row 4a that supplies a humectant to the sanitary paper P, and a support roller 4b that sandwiches the sanitary paper P between the transfer roller 4a, and the transfer roller 4a and the support roller 4b. Is rotated, and the sanitary paper P is introduced in the meantime, thereby applying a moisturizing agent to the sanitary paper P. As the moisturizing agent applied by the moisturizing agent applying unit 4, various liquids used for general moisturizing paper can be used. As the humectant, for example, a liquid containing glycerin, diglycerin, propylene glycol, 1.3-butylene glycol or the like as one or more components can be used. The moisturizing agent application process by the moisturizing application unit 4 is performed immediately after the paper dust removing process by the second paper dust removing device 1b, and there is almost no paper dust remaining on the surface of the sanitary paper P. Because it is not affected by paper dust, the moisturizer can be applied evenly.

According to the above process, it is possible to obtain a two-ply sanitary paper on which paper dust is efficiently removed and printing and application of a humectant are performed.
Further, a cutter 55 and a take-up roller 56 are located downstream of the moisturizer application unit 4, and the sanitary paper P is cut to a predetermined width by the cutter 55 and then taken up by the take-up roller 56. May be used. The wound sanitary paper P may be folded into a tissue carton by a known carton filling unit (not shown) after being folded by a known folding unit (not shown). .

(2-2. Second Embodiment of Manufacturing Method)
FIG. 3 is a block diagram showing an apparatus for executing the sanitary paper manufacturing method according to the second embodiment. The second embodiment will be described with a focus on differences from the first embodiment described above.

  Unlike the first embodiment, the second embodiment includes a first base paper P1 fed out from the first raw roll 51 and a second base paper P2 fed out from the second raw roll 52. Prior to superposition in the superposition unit 2, paper dust removal processing using the paper dust removal devices 1a and 1b is performed on each of the first base paper P1 and the second base paper P2.

  More specifically, a first paper dust removing device 1a is disposed downstream of the first raw roll 51. Here, as shown in FIG. 3, the first paper dust removing device 1a has an air discharge port 11a connected to the electric blower 12a via a discharge pipe 13a in the horizontal conveyance path of the first base paper P1. An air suction port 21a that is provided on the lower side and is connected to the electric suction machine 22a and the dust collector 23a via the suction pipe 24a is provided on the upper side of the horizontal conveyance path of the first base paper P1. The neutralizing means 30a is disposed on the upper side of the horizontal conveyance path of the first base paper P1 together with the air suction port 21a. Further, a second paper dust removing device 1b is disposed downstream of the second original fabric roll 52. Here, as shown in FIG. 3, the second paper dust removing device 1b is configured such that the air discharge port 11b connected to the electric blower 12b via the discharge pipe 13b is in the horizontal conveyance path of the second base paper P2. An air suction port 21b provided on the upper side and connected to the electric suction machine 22b and the dust collector 23b via the suction pipe 24b is provided on the lower side of the horizontal conveyance path of the second base paper P2. The neutralizing means 30b is disposed below the horizontal conveyance path of the second base paper P1 together with the air suction port 21b. Then, the first base paper P1 from which the paper dust is removed using the first paper dust removing device 1a and the second base paper P2 from which the paper dust is removed using the second paper dust removing device 1b are overlapped. In the part 2, the two-ply sanitary paper P is obtained by overlapping each other.

  At the stage where the sanitary paper is wound around the raw roll, paper powder is not a little stuck on the paper surface. For this reason, if the base paper fed out from the raw roll is immediately overlapped, paper dust will be interposed between the base paper layers. It is relatively difficult to remove the paper dust once sandwiched between the layers of the base paper in a subsequent paper dust removal process. Therefore, before overlaying the base paper, the paper dust removing device of the present invention is used to reliably remove the paper dust on both sides of the base paper between the base paper rolls. The situation where paper dust stays can be prevented efficiently. In particular, the first paper dust removing device 1a blows air onto the lower surface of the first base paper P1 to remove the paper dust, and the second paper dust removing device 1b blows air onto the upper surface of the second base paper P2. After the paper dust is removed, the bottom surface of the first base paper P1 and the top surface of the second base paper P2 are overlapped, so that the situation where the paper dust stays between the paper layers of the sanitary paper P can be further ensured. Can be prevented.

  Further, as shown in FIG. 3, in the second embodiment, unlike the first embodiment, the third paper dust removing device 1c is located downstream of the printing unit 3 and upstream of the moisturizing agent applying unit 4. And the 4th paper dust removal apparatus 1d is arrange | positioned. Here, in the third paper dust removing device 1c, as shown in FIG. 3, the air discharge port 11c connected to the electric blower 12c via the discharge pipe 13c is located above the horizontal conveyance path of the sanitary paper P. The air suction port 21c connected to the electric suction machine 22c and the dust collector 23c via the suction pipe 24c is provided below the horizontal conveyance path of the sanitary paper P. The neutralizing unit 30c is disposed below the horizontal conveyance path of the sanitary paper P together with the air suction port 21c. Further, as shown in FIG. 3, the fourth paper dust removing device 1d has an air discharge port 11d connected to the electric blower 12d via the discharge pipe 13d on the lower side of the horizontal conveyance path of the sanitary paper P. The air suction port 21d connected to the electric suction machine 22d and the dust collector 23d via the suction pipe 24d is provided above the horizontal conveyance path of the sanitary paper P. The neutralizing means 30d is arranged on the upper side of the horizontal conveyance path of the sanitary paper P together with the air suction port 21d.

  As in the second embodiment, the third paper dust removing device 1c and the fourth paper dust removing device 1d, in which the air discharge port and the air suction port are turned upside down across the horizontal conveyance path of the sanitary paper P, By arranging them side by side, the paper dust adhering to the upper and lower surfaces of the sanitary paper P can be more reliably removed. Further, by providing the third paper dust removing device 1c and the fourth paper dust removing device 1d on the downstream side of the printing unit 3, the drying of the ink applied by the printing unit 3 can be promoted, and these paper dusts can be removed. By applying a moisturizing agent to the sanitary paper P on the downstream side of the devices 1c and 1d, the ink can be prevented from bleeding.

  Also in the second embodiment, as in the first embodiment, the plurality of paper dust removing devices 1a, 1b, 1c, and 1d share one electric blower and one electric suction device. It may be a thing.

(2-3. Third Embodiment of Manufacturing Method)
FIG. 4 is a block diagram showing an apparatus for executing the sanitary paper manufacturing method according to the third embodiment. The manufacturing method according to the third embodiment can be applied to a method for manufacturing a toilet roll, for example.

  As shown in FIG. 4, a first base paper P1 and a second base paper P2 are wound around a first raw roll 51 and a second raw roll 52, respectively. 51 and 52 have a width several to several tens of times the width of a toilet roll as a product.

  On the downstream side of the first original fabric roll 51 and the second original fabric roll 52, an overlapping portion 2 (superimposing roller) is located, and is conveyed through the guide roller 53 in the overlapping portion 2. The first base paper P1 and the second base paper P2 are superposed to form a sanitary paper P.

  An embossing part 57 is located downstream of the overlapping part 2. The embossing unit 57 includes, for example, an embossing roller 57a and a receiving roller 57b at positions facing each other across the conveyance path of the sanitary paper P. The embossing roller 57a has a plurality of convex portions corresponding to the embossing pattern applied to the sanitary paper P. On the other hand, the receiving roller 57b includes, for example, a metal roller in which a concave pattern complementary to the convex pattern of the embossing roller 57a is formed on the outer peripheral surface, or a rubber roller in which the outer peripheral surface of the roller is covered with rubber. Can be used. In the embossing portion 57, the sanitary paper P is introduced between the embossing roller 57a and the receiving roller 57b, and the sanitary paper P is sandwiched and pressed, thereby embossing a pattern corresponding to the convex portion of the embossing roller 57a. , It can be applied to the surface of the sanitary paper P. By performing the embossing, the bonding force between the first base paper P1 and the second base paper P2 is improved, and the design of the sanitary paper P can be improved by the emboss pattern.

  The first paper dust removing device 1a and the second paper dust removing device 1b are located downstream of the embossing portion 57. Here, in the first paper dust removing device 1a, as shown in FIG. 4, the air discharge port 11a connected to the electric blower 12a via the discharge pipe 13a is located above the horizontal conveyance path of the sanitary paper P. The air suction port 21a connected to the electric suction machine 22a and the dust collector 23a through the suction pipe 24a is provided below the horizontal conveyance path of the sanitary paper P. The neutralizing means 30a is arranged below the horizontal conveyance path of the sanitary paper P together with the air suction port 21a. Further, as shown in FIG. 4, the second paper dust removing device 1b has an air discharge port 11b connected to the electric blower 12b via the discharge pipe 13b on the lower side of the horizontal conveyance path of the sanitary paper P. The air suction port 21b connected to the electric suction machine 22b and the dust collector 23b via the suction pipe 24b is provided on the upper side of the horizontal conveyance path of the sanitary paper P. The neutralizing means 30b is disposed on the upper side of the horizontal conveyance path of the sanitary paper P together with the air suction port 21b.

  A take-up roller 56 for taking up the long sanitary paper P is located on the downstream side of the paper dust removing device 1, and the sanitary paper P subjected to the paper dust removing process is placed on the take-up roller 56. It is wound. Thus, by disposing the paper dust removing devices 1a and 1b near the take-up roller 56, sanitary paper from which paper dust has been removed can be obtained more efficiently. That is, after the process of removing paper dust, if the distance for transporting the sanitary paper P is long, resistance is applied to the surface of the sanitary paper P, and paper dust is regenerated before the sanitary paper P is taken up. There is concern. Therefore, immediately after the paper dust is removed from the sanitary paper P (for example, within 1 m to 20 m), the sanitary paper P can be prevented from being regenerated by winding the sanitary paper P.

  The sanitary paper P taken up by the take-up roller 56 is then carried out to a cutting section (not shown), and the long sanitary paper P is cut into a predetermined width by a log saw to form individual toilet rolls. .

  The present invention relates to a paper dust removing device for removing paper dust adhering to sanitary paper, and a method for producing sanitary paper using the paper dust removing device. Therefore, the present invention can be suitably used in the sanitary paper manufacturing industry.

DESCRIPTION OF SYMBOLS 1 Paper dust removal apparatus 2 Overlay part 3 Printing part 4 Moisturizing agent application part 10 Air discharge part 11 Air discharge port
12 Electric Blower 13 Discharge Pipe 20 Air Suction Part 21 Air Suction Port 22 Electric Suction Machine 23 Dust Collector 24 Suction Pipe 30 Static Eliminator (Static Removal Brush)
31 Substrate 32 Brush part 51 First raw roll 52 Second raw roll 53 Guide roller 54 Calendar part 55 Cutter 56 Winding roller 57 Embossing part

Claims (7)

In the paper dust removing device (1) for removing paper dust adhering to sanitary paper,
An air discharge part (10) capable of discharging air and an air suction part (20) capable of sucking air;
The air discharge unit (10) has an air discharge port (11) at one side of the sanitary paper conveyance path and at a position facing one surface of the sanitary paper,
The air suction part (20) has an air suction port (21) at a position opposite to the other surface of the sanitary paper on the other side of the sanitary paper transport path,
The air discharge port (11) and the air suction port (21) are provided at positions facing each other across the sanitary paper conveyance path,
A paper dust removing device that removes the paper dust by sucking air discharged from the air discharge port (11) from the air suction port (21) through the sanitary paper. The air discharge port (11) is provided below the horizontal transport path of the sanitary paper,
The paper dust removing device according to claim 1, wherein the air suction port (21) is provided on an upper side of a horizontal conveyance path of the sanitary paper. The neutralization part (30) for neutralizing the static electricity charged to the said sanitary paper is further provided in the conveyance path upstream side of the said air discharge port (11) and the said air suction port (21). 2. The paper dust removing device according to 2. The paper dust removing apparatus according to any one of claims 1 to 3, wherein the static elimination unit (30) is a static elimination brush that contacts a surface of the sanitary paper. Removing the paper dust adhering to the sanitary paper by the paper dust removing device (1) according to any one of claims 1 to 4,
A method for producing sanitary paper using a paper dust removing device, comprising: a step of superimposing the sanitary paper by an overlapping unit (2) that superimposes the sanitary paper in a plurality of layers after removing the paper dust. Removing the paper dust adhering to the sanitary paper by the paper dust removing device (1) according to any one of claims 1 to 4,
And a step of printing on the sanitary paper by a printing unit (3) for printing on the sanitary paper after removing the paper dust. Removing the paper dust adhering to the sanitary paper by the paper dust removing device (1) according to any one of claims 1 to 4,
Applying a moisturizing agent to the sanitary paper by a moisturizing agent application section (4) for applying a moisturizing agent to the sanitary paper after removing the paper dust. Production method.

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