JP2006026752A - Paper dust removing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper dust removing device for removing, from the traveling paper sheet surface, paper dust generated in cutting a paper sheet with a cutter, surely removing the paper dust without damaging the paper sheet. <P>SOLUTION: This paper dust removing device 30b including a nozzle part 31b and an air collecting part 33b is disposed on the downstream side of a slitter part 2 of the cutter. The treating air from the nozzle part 31b is blown toward the counter-traveling direction of the paper sheet L, and the flow of treating air is guided to the air collecting part 32b by Coanda effect. With the flow of the treating air, the ambient air flows in the same direction, thereby floating the paper dust on the surface of the paper sheet L to be accompanied by the flow of the ambient air and sucked from the air collecting part 33b. Thus, the paper dust contained in the air is discarded. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus for removing paper dust that may adhere to the surface of a flat sheet when processed into a flat sheet in a paper mill.

  In a paper mill, when paper is produced by supplying pulp, which is a raw material of paper, to a paper machine, it is completed in the form of a wound paper. In order to improve the productivity of these paper machines, the paper making speed is increased or the paper width is increased. Recently, there are papers having a paper width of 8 m. On the other hand, consumers such as newspaper companies, printing companies, packaging material companies, etc. do not own machinery equipment that handles wide and large-diameter windings, and handle wide webs when shipping as a paper mill. Hateful.

  For this reason, in a paper mill, a web wound by a machine reel of a paper machine is processed into a winding having an appropriate width and diameter according to the mechanical capability of a printing machine owned by a customer, or a predetermined dimension. It is cut to a flat size and shipped. In a papermaking factory, a paper manufactured by a paper machine and wound on a reel spool is subjected to a slitter and divided into small widths in order to finish the paper with a small width and a small diameter. In the case of finishing to a flat size, after being divided into small widths, it is further cut by a rotary cutter at a predetermined dimension position in the longitudinal direction to form a flat size. After that, they are stacked on a pallet with a layboy to form a paper pile.

  When cutting with the slitter to a small width, the peripheral speed of the blade is larger than the traveling speed of the paper, so that the cutting portion is frayed and paper dust is generated. The paper dust may be rolled up backwards by the running of the paper and adhere to the paper surface. In particular, it is often seen when the sharpness of the slitter blade is reduced, or when a lot of used paper is used as the paper raw material.

  When paper with paper dust still attached to the paper surface is subjected to offset printing, which is lithographic printing, paper dust accumulates on the blanket, causing pilling that disturbs the image, and so-called spots that cause white spots in the printed image area To wake you up. Also in gravure printing, which is intaglio printing, there is a possibility that it adheres to the plate surface and the plate surface becomes dirty and the printing surface is soiled. For this reason, it is necessary to remove the paper dust adhering to the surface of the cut paper. In addition, since the removal of the paper dust on the surface is complicated after the lamination, the removing operation becomes complicated. Therefore, it is necessary to carry out the paper sheet traveling with the cutter device before the lamination.

  As this type of paper dust removing device, for example, there is a dust collecting device described in Patent Document 1. This dust collecting device is designed to suck and remove dust dust such as paper dust generated in the product manufacturing process, such as cutting, slitting, and half-cutting of strips, and cutting of knives for cutting etc. The air flows along the sheet material feeding direction by blowing air to a position close to the cutting point or the like, arranged upstream of the point material in the sheet material feeding direction and on one surface side of the sheet material. An air blowing nozzle for attracting and capturing the dust generated by the cutting or the like in the flow of the air, and downstream of the cutting point in the feeding direction of the sheet material and of the sheet material The one side is disposed at a position substantially aligned with the air blowing nozzle, and sucks and removes the dust attracted and trapped by the air flow. Those that are configured to include a duct.

  Patent Document 2 discloses a paper dust removing device that does not contact paper and damages the paper surface. This paper dust removing device is provided on the surface of the paper traveling on the roll from a direction opposite to the traveling direction at a position where the traveling direction of the paper is converted upward or downward by a roll such as a guide roll in the paper traveling path. By discharging with high-speed air, the paper powder is separated from the paper surface by the centrifugal force applied to the paper surface and the discharge force of the high-speed air, and is sucked by a suction device.

JP-A-10-156696 JP 2002-200591 A

  In the dust collecting apparatus disclosed in Patent Document 1, the air blowing nozzle and the suction duct are arranged with a slitter knife or the like interposed therebetween, and the air blowing nozzle flows air flowing in the same direction as the traveling direction of the sheet material. The following problems may occur due to the air blown out. As described above, the paper dust generated when the paper is cut with the slitter knife is rolled up backward in the paper traveling direction. Then, the rolled up paper dust is blown forward by the air spray nozzle. This paper dust is sucked by the suction duct, but some paper dust is not attracted and trapped by the air flow. In particular, the paper dust accompanying the travel of the sheet material is not easily attracted by the air flow and is not easily sucked by the suction duct. For this reason, there exists a possibility that the paper dust which passes a suction duct may generate | occur | produce. Since the paper dust that has passed through the suction duct will not be removed thereafter, it will drop and adhere to the surface of the sheet material, and will be used in processes such as printing. Further, when the suction duct is brought close to the sheet material so that the paper dust accompanying the travel of the sheet material can be reliably sucked, the sheet material is cut behind the slitter knife, so that the sheet material is attracted to the suction duct. Contact with it may cause injury or sucking.

  In addition, the paper dust removing device disclosed in Patent Document 2 deteriorates the working atmosphere because paper dust released from the paper surface by high-speed air is not sucked by the suction device and is scattered in the atmosphere. There is a fear. In addition, since the paper dust removing device is arranged at a roller portion that changes the traveling direction of the paper, if the portion is farther from the location where the paper dust is generated, before the paper dust removing device is used. There is a possibility that paper dust has already been scattered in the atmosphere.

  Therefore, the present invention can reliably remove the paper dust even if the nozzle portion that blows out the air is arranged at a distance that does not come into contact with the paper surface, and the generated paper dust is scattered in the working atmosphere. It aims at providing the paper dust removal apparatus which prevented doing as much as possible.

  As a technical means for achieving the above object, a paper dust removing device according to the present invention is a paper dust removing device for removing paper dust adhering to the surface of a running paper sheet. An air blowing means for blowing out processing air toward the anti-travel direction on the surface of the sheet, an air guiding means for guiding the flow direction of the processing air blown from the air blowing means, and a treatment guided by the air guiding means Air recovery means for sucking and recovering air, attracting ambient air in accordance with the flow of the processing air, floating paper dust on the surface of the paper sheet by the attracted ambient air, and collecting the air The paper powder is sucked together with the processing air sucked and collected by the means and the surrounding air.

  Since ambient air attracted by the processing air flows on the surface of the paper sheet that is running, the paper dust adhering to the surface is floated by this air flow. The paper dust that has floated up is conveyed by the air flow of the processing air and the surrounding air. Since this air flow is sucked and recovered by the air recovery means, paper dust is also sucked in, captured by a dust removing device or the like and discarded.

  Further, since the processing air is blown toward the upstream side of the paper sheet, the paper dust is conveyed backward in the traveling direction. For this reason, even if paper dust that is not captured by the air recovery means falls on the paper sheet, it is lifted when it advances again to the vicinity of the air blowing means. Therefore, paper dust that passes through the air recovery means can be reduced as much as possible, and paper dust is prevented from being brought into the subsequent process.

  The guidance in the flow direction of the processing air by the air guiding means utilizes the so-called Coanda effect due to the viscosity of the air, and the air blowing means is opened so that the air layer guided by the air guiding means has an appropriate thickness. It is preferable to adjust the area.

  In the paper dust removing device according to the invention of claim 2, the air guide means is a curved surface having a convex side on the processing air flow position side with a direction parallel to a plane including the processing air blowing range as an axial direction. A blowing guide plate that is formed and extends from 0 ° to 90 °, preferably approximately 45 ° with respect to the surface of the paper sheet, in a direction parallel to the tangent to the curved surface, and guides processing air blown out from the air blowing means. And a recovery guide plate for guiding the processing air guided by the air guiding means and the ambient air accompanying the processing air to the recovery port of the air recovery means.

  The processing air blown out from the air blowing means is guided to the curved surface by the Coanda effect, and is preferably blown into the tangential method of the curved surface at approximately 45 ° with respect to the paper sheet surface. It will be. For this reason, the processing air is reliably guided by the air guiding means. Therefore, the ambient air is surely attracted and the flow to the air recovery means is reliably formed. If the Coanda effect can be reliably received and the ambient air can accompany the air recovery means, the recovery guide plate may be in the range of 0 to 90 °, not 45 °.

  According to a third aspect of the present invention, there is provided the paper dust removing device, wherein the collection guide plate is in a direction parallel to the tangent line of the curved surface at 0 ° to 90 °, preferably about 45 ° with respect to the surface of the paper sheet. It is characterized by being stretched.

  The collection guide plate may be in the range of 0 ° to 90 °, but preferably 45 °, and if the blowing guide plate is also set to approximately 45 °, the collection guide plate is processed in a direction of approximately 45 ° with respect to the paper sheet. It is preferable to blow out the air and suck in the processing air and the surrounding air in a direction of approximately 45 °.

  According to a fourth aspect of the present invention, the paper dust removing device is characterized in that the air blowing means, the air guiding means, and the air collecting means are provided on the downstream side of the slitter portion of the cutter device.

  In a cutter device that cuts a rolled paper into a flat size, the paper is cut by a slitter section that cuts the paper sheet at an appropriate position in the width direction, a turning knife section that cuts the paper sheet at an appropriate position in the flow direction, or the paper sheet is crushed by a decurler section. Generation of powder is confirmed. Among these, the paper dust removing device is arranged on the downstream side of the slitter unit that generates the largest amount.

  The paper dust removing device according to the invention of claim 5 is characterized in that the air blowing means, the air guiding means, and the air collecting means are provided at a distance of 10 mm or more from the surface of the paper sheet.

  By arranging the air blowing means and the like so as to be separated from the paper sheet, even when the paper sheet flutters, it does not contact the air blowing means.

  According to a sixth aspect of the present invention, there is provided the paper dust removing device, wherein the air blowing means, the air guiding means, and the air collecting means are provided separately corresponding to the slit eyes and in a direction parallel to the width direction of the paper sheet. It is characterized by being slidably supported.

  In the cutter device, the slitter knife is movable in the width direction of the paper sheet so that the width of the paper sheet that can be cut can be adjusted. Since paper dust is mainly generated at the cutting position by the slitter knife, the air blowing means and the air collecting means may be provided separately corresponding to the cutting positions by the slitter knife. For this reason, these are supported so as to be slidable in the width direction of the paper sheet, and the position can be changed in accordance with the slits cut by the slitter knife.

  According to a seventh aspect of the present invention, there is provided the paper dust removing device, wherein the air blowing means, the air guiding means, and the air collecting means are provided continuously in the width direction of the paper sheet, and the paper dust is spread over the entire area of the paper sheet. It is characterized by removing.

  As described above, it is sufficient that the air blowing means, the air guiding means, and the air collecting means constituting the paper dust removing device are arranged separately corresponding to the slit eyes, but in the entire width of the paper sheet. If it is continuous, paper dust scattered in a position away from the slits can be removed.

  According to the paper dust removing apparatus of the present invention, the flow of the processing air causes a flow in the surrounding air, and the paper dust attached to the surface of the paper sheet is floated by the airflow of the surrounding air. Since it is made to suck in and collect | recover from an air collection | recovery means, the paper dust on the paper sheet surface during driving | running | working can be removed favorably. In addition, since the processing air is blown out in the anti-travel direction of the paper sheet, the ambient air flows toward the upstream side in the travel direction. For this reason, the paper dust is blown to the upstream side of the air blowing means, and even if it is not sucked by the suction means, the paper dust is not taken out to the downstream side of the paper dust removing device. Therefore, the paper sheet from which the paper dust has been reliably removed from the surface can be used for the next step.

  Moreover, according to the paper dust removing apparatus of the second aspect of the invention, the processing air is reliably guided to the air guiding means, and the guided air layer can be thickened. For this reason, ambient air can be reliably attracted without bringing the air blowing means and the air recovery means close to the paper sheet. Therefore, even when wrinkles occur in the paper sheet, the paper sheet does not interfere with the paper dust removing device, and neither a scratch nor a sucking wound occurs.

  Moreover, according to the paper dust removing apparatus of the third aspect, the collection guide plate does not approach the paper sheet and does not contact the paper sheet.

  Further, according to the paper dust removing device according to the invention of claim 4, since the paper dust is disposed on the downstream side of the portion where the paper dust is most generated among the respective parts of the cutter device, the paper dust generated by the cutter device is pre-stacked. It can be efficiently removed from the surface of the paper sheet.

  Further, according to the paper dust removing device of the invention of claim 5, the air blowing means, the air guiding means, and the air collecting means are sufficiently separated from the surface of the paper sheet. Even in this case, the air blowing means or the like is not contacted, and the paper sheet is not damaged.

  Further, according to the paper dust removing device of the invention of claim 6, even when the position of the slitter knife for changing the cutting width of the paper sheet is changed, the paper dust removing process can be surely performed. .

  According to the paper dust removing device of the seventh aspect, the paper dust removing process can be performed over the entire area of the paper sheet.

  The paper dust removing apparatus according to the present invention will be specifically described below based on the preferred embodiments shown in the drawings.

  FIG. 9 shows a schematic structure of a cutter device suitable for mounting the paper dust removing device according to the present invention. A plurality of webs P to be cut into small widths are rotatably supported by the unreel stand unit 1, and the rewound paper sheet L is an exit of the unreel stand unit 1 and is a slitter unit 2. It is superimposed when passing through the lead-in roll 21 at the entrance. A tail slitter 22, a paper roll 23, and a slitter knife 24 are sequentially arranged downstream of the lead-in roll 21. The slitter knife 24 cuts the paper sheet L at a plurality of locations in the width direction, and a plurality of slitter knives 24 are provided in a state where the blade enters the traveling area of the paper sheet L. For example, when the paper sheet L is cut into five sheet rows, so-called five-sheet cutting, four slitter knives 24 are provided, and both end portions are cut 2 to make the width of the paper sheet L constant. One slitter knife 24 is provided, and a total of six slitter knives 24 are provided. The tail slitter 22 also cuts the end of the paper sheet L in the width direction. If the width is large, the tail slitter 22 cuts the tail slitter 22 to an appropriate width. The slitter knife 24 positioned in each of the two is cut so as to have a predetermined width. A first feed roll 25 is disposed downstream of the slitter knife 24.

A plurality of sheet rows L ₁ ,..., L _n of the paper sheet L cut by the slitter knife 24 are combined in an appropriate combination, and after passing through the first feed roll 25, the upper side running area and the lower side Branches in two directions with the running area. For example, it is assumed that L ₁ , L ₂ , and L ₃ are branched to the upper traveling area and L ₄ and L ₅ are branched to the lower traveling area, respectively, by taking _five . A second feed roll 26 is provided in the upper traveling area at a height substantially equal to the first feed roll 25. The sheet rows L _{1 to} L ₃ that have passed through the second feed roll 26 are guided in a direction substantially parallel to the sheet rows L _{4 to} L ₅ that have passed through the first feed roll 25 and are guided to the lower traveling area. Is done. A turning knife portion 3 is disposed on the downstream side of each of the first feed roll 25 and the second feed roll 26. In this turning knife section 3, each of the sheet rows L ₁ ,..., L _n is cut in the flow direction to form a flat sheet having a predetermined size.

  A constant velocity conveyor unit 4 is disposed downstream of the turning knife unit 3 so that the flat sheets formed through the upper traveling region and the lower traveling region merge together. It is. A low speed conveyor unit 5 is disposed downstream of the constant velocity conveyor unit 4, and the flat sheet is transferred from the constant velocity conveyor unit 4 to the low speed conveyor unit 5. At this time, the flat sheets are appropriately overlapped due to the difference in the conveying speed of the conveyor units 4 and 5. The flat sheet conveyed by the low-speed conveyor unit 5 is placed and stacked on the pallet 7 in the layboy unit 6 disposed downstream of the low-speed conveyor unit 5 and conveyed to the next process.

  1 and 2 are sectional views showing a schematic structure of a paper dust removing device 30 according to the present invention, and the relationship with a paper sheet L is also shown. The paper sheet L travels in the direction indicated by the arrow N in both FIG. 1 and FIG. 2, and the paper dust D is attached to the surface of the paper sheet L. FIG. 2 shows a first embodiment of a paper dust removing device 30a having a basic structure, and FIG. 1 shows a second embodiment of a paper dust removing device 30b having an improved structure.

As shown in FIG. 2, the paper dust removing device 30a includes a nozzle portion 31a constituting air blowing means, and a guide portion 32a serving as air guiding means for guiding the flow of processing air blown from the nozzle portion 31a. And an air recovery part 33a constituting an air recovery means provided on the opposite side of the nozzle part 31a with the guide part 32a interposed therebetween. The guide portion 32a guides the processing air blown from the nozzle portion 31a so as to flow along the wall surface of the guide portion 32a using the so-called Coanda effect due to its viscosity. For this reason, as shown in FIG. 2, both corners of the wall surface facing the paper sheet L are formed in a part of an arc having an appropriate radius with the width direction of the paper sheet L as the axial direction. The corner portion 32a ₁ guides the processing air to the lower wall surface 32a ₂ parallel to the surface of the paper sheet L, and the corner portion 32a ₃ on the air recovery portion 33a side extends along the lower wall surface 32a _2. The flow of processed air is guided to the air recovery unit 33a. As shown in the figure, the direction of the processing air flowing along the lower wall surface 32a ₂ is opposite to the traveling direction N of the paper sheet L.

  In the paper dust removing device 30a according to the first embodiment, the processing air flows along the guide portion 32a, thereby attracting the surrounding air, and the attracted surrounding air flows along the surface of the paper sheet L. . For this reason, the paper dust D adhering to the paper sheet L floats from the surface of the paper sheet L, and the floated paper dust D is accompanied by the flow of ambient air. Since the processing air is guided by the guide portion 32a and sucked into the air recovery portion 33a to be recovered, ambient air including paper dust D that is attracted by the processing air and floats from the surface of the paper sheet L is also included. Similarly, it is sucked into the air recovery part 33a. Therefore, the paper dust D is sucked into the air recovery unit 33a and removed from the paper sheet L. Note that a suction blower or the like may be connected to the air recovery unit 33a via an appropriate dust removing device so that the sucked paper dust D is collected and removed.

In the first embodiment described above, the corners 32a ₁ and 32a ₃ are formed as part of an arc, and the lower wall surface 32a ₂ is formed as a flat surface. It is difficult to adjust the relationship with the suction speed in the air recovery unit 33a. In addition, when the air layer is thick without being able to achieve a sufficient Coanda effect, the air layer may be peeled off from the lower wall surface 32a ₂ and the floated paper powder D may be scattered. There is. For this reason, the paper dust removing device 30b having the structure shown in the second embodiment was obtained by improving the first embodiment.

  FIG. 1 is a sectional view showing a part of a paper dust removing device 30b according to the second embodiment. The guide portion 32b, which is an air guide means, is formed by a part of the outer peripheral surface of the arc. A nozzle portion 31b, which is an air blowing means, is formed by the outer peripheral surface of this arc and the blowing guide plate. The guide portion 32b is formed by a part of the outer peripheral surface of the cylinder whose axial direction is parallel to the surface containing the processing air blown out from the nozzle portion 31b. The blowing guide plate 34 is parallel to a tangent to the arc of the outer peripheral surface of the guide portion 32b, is in a direction substantially 45 ° with respect to the surface of the paper sheet L, and is opposite to the traveling direction of the paper sheet L It is stretched in the direction. Further, the air recovery part 33b as the air recovery means is formed by the outer peripheral surface of the guide part 32b and the recovery guide plate 35 so as to receive the processing air blown out from the nozzle part 31b and flowing along the guide part 32b. It is comprised by the formed opening. Further, the collection guide plate 35 is parallel to a tangent to the arc of the outer peripheral surface of the guide portion 32b, and is directed at a direction of approximately 45 ° with respect to the surface of the paper sheet L and in the traveling direction of the paper sheet L. It is stretched. The flow direction of the processing air blown out from the nozzle portion 31b and along the guide portion 32b is opposite to the traveling direction N of the paper sheet L.

  If the Coanda effect can be sufficiently exhibited, the guide portion 32b does not depend on a part of the outer peripheral surface of the cylinder, and has a direction parallel to the surface including the blowout range of the processing air blown from the nozzle portion 31b. The axial direction may be formed by a curved surface with the processing air flow position side convex. Similarly, the blowing guide plate 34 and the collection guide plate 35 do not have to be 45 ° with respect to the surface of the paper sheet L, and may be in the range of 0 ° to 90 °.

  In the paper dust removing device 30b according to the second embodiment, the processing air blown from the nozzle portion 31a is supplied to the guide portion 32b formed on the circumferential surface in the tangential direction of the arc, so that the processing air is circular. It flows along the peripheral surface, and the change in the flow direction is relaxed, so that the air layer is difficult to peel off from the guide portion 32b. For this reason, ambient air can be reliably attracted by the processing air, and the paper dust D can be reliably lifted from the surface of the paper sheet L and sent to the air recovery section 33b. In addition, since the turning angle of the processing air guided to the guide portion 32b can be reduced, it becomes more difficult to peel from the guide portion 32b. In addition, since the ambient air is reliably guided to the air recovery part 33b by the recovery guide plate 35, the paper dust D can be reliably recovered.

  FIG. 3 is a block diagram showing a configuration relating to the removal and recovery processing of the paper dust D by the paper dust removing device 30. The same applies to both the paper dust removing devices 30a and 30b according to the first embodiment and the second embodiment. Since each configuration is provided, each part will be described with reference numerals that do not include subscripts. The paper dust removing device 30 includes a blowout header 40 provided with the nozzle part 31 and a suction header 50 provided with the air recovery part 33. An air supply device 8 such as a blower or a compressor is connected to the blowing header 40. A suction device 10 such as a blower is connected to the suction header 50 via a dust removing device 9 such as a dust collector.

  Then, the air sucked by the air supply device 8 is supplied to the blowing header 40 and blown out as processing air from the nozzle portion 31 of the blowing header 40. The blown processing air flows along the guide portion 32 due to the Coanda effect. At this time, since negative pressure is generated by the flow of the processing air, the surrounding air is attracted and flows along with the processing air. Since the airflow generated in the ambient air is generated along the surface of the paper sheet L, the paper dust D adhering to the surface of the paper sheet L is lifted and accompanied with the airflow. The processing air and the surrounding air containing the paper powder D are sucked from the air recovery unit 33. At this time, in the structure in which the recovery guide plate 35 is provided, the processing air and the ambient air are reliably guided to the air recovery unit 33. Further, when sucking from the air recovery unit 33, negative pressure is generated in the vicinity thereof, so that accompanying air accompanying the traveling of the paper sheet L is also sucked. Moreover, since the accompanying air receives a force in the direction toward the paper dust removing device 30 as the paper sheet L travels, the accompanying air is sucked in by receiving this force and the negative pressure. That is, a negative pressure is generated in the vicinity of the nozzle portion 31 and the air recovery portion 33 of the paper dust removing device 30, so that the surrounding air flows toward the paper dust removing device 30. For this reason, the paper dust D floating from the paper sheet L is hardly scattered in the surrounding working atmosphere.

  The processing air, the ambient air, and the accompanying air that have reached the air recovery unit 33 are sucked and recovered by the suction device 10, but are included in these air by passing through the dust removal device 9 in the middle thereof. The paper dust D is removed and then released from the suction device 10 to the atmosphere. Since the discharged air is cleaned by removing the paper dust D, the working atmosphere is not contaminated.

  In the cutter apparatus shown in FIG. 9 described above, as the generation site of the paper dust D, the decurler unit that performs the squeezing process on the paper sheet L at the exit of the unreel stand unit 1 and the paper sheet L are cut at a desired position in the width direction. There are a slitter section 2 for turning, and a turning knife section 3 for cutting the paper sheet L in the flow direction. Among these, the place where the most paper dust D to be removed is generated is the slitter unit 2. For this reason, this paper dust removal apparatus 30 is installed in the downstream of the slitter part 2, and the structure is demonstrated based on FIGS.

  4 is an enlarged side view showing the vicinity of the slitter unit 2, and FIG. 5 is a view taken along the line AA in FIG. A slitter beam 60 whose longitudinal direction is the width direction of the paper sheet L is stretched on the downstream side of the slitter unit 2, and a paper dust removing device 30 is attached to the slitter beam 60. In the case of five picks, six paper dust removing devices 30 are attached to correspond to each of the slitter knives 24. As shown in FIG. 5, an appropriate number of support rods 61 are attached to the front surface of the slitter beam 60, and each paper dust removing device 30 is slidably supported in the longitudinal direction of the slitter beam 60. For this reason, the arrangement position of the paper dust removing device 30 can be changed corresponding to the position of the slitter knife 24.

  6 and 7 show the appearance and schematic structure of the paper dust removing device 30. FIG. The blowing header 40 and the suction header 50 are integrally combined, and the nozzle portion 31 is provided at the tip portion of the blowing header 40, and the air recovery portion 33 is provided at the tip portion of the suction header 50 by openings. Yes. The blowing header 40 has two chambers, a blowing chamber 41 in which the nozzle portion 31 is provided and a chamber chamber 42, and is partitioned by a rectifying plate 43 in which a small hole is formed. A cylindrical tube material 44 is attached to the distal end portion of the blowing chamber 41, and the guide portion 32 is configured by the outer peripheral surface of the tube material 44. An air supply duct 45 is connected to the side wall of the chamber chamber 42. On the other hand, a pair of suction ducts 51 are connected to the ceiling wall of the suction header 50. As shown in FIG. 5, an air supply main pipe 61 and a suction main pipe 62 are disposed above the slitter beam 60. The air supply duct 45 is provided in the air supply main pipe 61, and the suction duct 51 is provided in the suction. Each is connected to the main pipe 62. Further, the air supply main pipe 61 is connected to the air supply apparatus 8, and the suction main pipe 62 is connected to the suction apparatus 10 via the dust removing apparatus 9.

  FIG. 8 is a system diagram illustrating air supply / exhaust of the paper dust removing device 30 and corresponds to the block diagram of FIG. An air supply device 8 comprising an air supply blower is connected to the air supply duct 45, and the air that has been purified and sucked in through the filter 8a is supplied from the air supply duct 45 to the chamber chamber 42 of the blowing header 40. On the other hand, the suction duct 51 is connected to a suction device 10 composed of a suction blower via a dust removing device 9 composed of a cyclone type dust collector and a filter.

  The air supplied to the blowing header 40 from the air supply device 8 through the air supply duct 45 is supplied from the side wall of the chamber chamber 42 having an appropriate capacity, so that the static pressure increases in the chamber chamber 42. . Then, it passes through the flow straightening plate 43 and is supplied to the blowing chamber 41. When passing through the rectifying plate 43, it passes through a small hole formed in the rectifying plate 43, so that there is a pressure loss and the flow direction is rectified constant. For this reason, the processing air blown from the nozzle portion 31 of the blowing chamber 41 is appropriately rectified, and flows by forming an air layer of an appropriate thickness along the guide portion 32 by the Coanda effect. .

  Since the air recovery unit 33 is connected to the suction device 10 via the air supply duct 51, the processing air including the paper dust D and the surrounding air are sucked and recovered by the suction force of the suction device 10. . Process air and ambient air sucked from the air recovery unit 33 are sent to the cyclone dust collector of the dust removing device 9 through the suction duct 51. Here, the air and the paper dust D are subjected to centrifugal force to separate the paper dust D in the air, the paper dust D is discarded, and the air is sucked into the suction device 10 through the downstream filter, and then into the atmosphere. Will be released.

  In the above-described embodiment, the nozzle portion 31, the guide portion 32, the air recovery portion 33, etc. are disposed on the upper surface side of the paper sheet. However, the present invention is not limited to this embodiment. These nozzle portions 31 and the like may be arranged on the lower surface side of the paper sheet.

  Since the paper dust removing device 30b according to the second embodiment described above was prototyped and the effect of paper dust removal was confirmed, an example thereof will be described below.

  A paper dust removing device 30 having the shape shown in FIGS. 6 and 7 was manufactured. The length M in the longitudinal direction of the outlet and the recovery port is 200 mm, the width Td of the nozzle portion 31 is 2 mm, and the width Ts of the air recovery portion 33 is 12 mm. The guide portion 32 uses a pipe having a nominal diameter of 25A. The rectifying plate 43 was a punching plate in which small holes with a diameter of 10 mm and a pitch of 12.5 mm were formed in a zigzag shape with a thickness of 3 mm and 60 °.

  Then, the paper dust removing device 30 was separated from the paper sheet L by about 10 mm, and the processing air was blown out from the nozzle portion 31 at 30 m / sec. At this time, attraction air of about 12 m / sec was generated on the surface of the paper sheet L. The suction speed from the air recovery part 33 was set to 15 m / sec with respect to this blowing speed. In addition, since the maximum speed of the accompanying air by the travel of the paper sheet L is 3 m / sec, the blowing speed of the processing air can sufficiently counter the speed of the accompanying air. Here, the relationship between the width Td of the nozzle portion 31 and the separation dimension of the paper dust removing device 30 from the paper sheet L is such that the blowing speed of the processing air is 20 to 50 m / sec, and the air layer of the processing air at that time Assuming that the diffusion thickness is 2 × Td and the thickness of the surrounding air layer attracted by the processing air is 3 × Td, the sum of the diffusion thickness of the processing air and the surrounding air layer (5 × Td) was taken as the separation dimension. That is, the width Td was 2 mm and the separation dimension was 5 × Td = 10 mm.

  Paper dust removal processing was performed while cutting the postcard paper with the paper dust removing device 30 according to the above specifications. After cutting, the cutting pile of the postcard paper (width 200 mm × length 762 mm × 1600 cut) was wiped with a cloth, paper dust was collected, and the number of paper dust remaining was measured and evaluated. For comparison, paper powder removal processing was also performed using a commercially available fixed brush paper dust removal device. This fixed brush type paper dust removing device has a structure in which a pair of fixed brushes are provided at an appropriate interval in the traveling direction of the paper sheet L, and a suction port is provided between the pair of brushes. By pressing against the surface of the paper sheet, paper dust accumulates at the tip of the paper sheet, and the paper powder is sucked and removed from the gap of the brush. FIG. 10 is a list showing these comparisons. The comparison was also performed on a blank that was not subjected to the paper dust removal process. In the table, fine dust indicates 0.01 to 0.15 mm paper dust, coarse dust indicates 0.15 mm or more paper dust, and the collected amount is about 35 cuts of postcard paper in the dust box of the dust remover. The weight of the paper powder etc. which stayed when performing the removal process is shown.

  As shown in FIG. 10, when the fixed brush type paper dust removing device and the paper dust removing device according to the present invention were compared, an equivalent paper dust removing effect was obtained. However, in the fixed brush type paper dust removing device, a phenomenon that the paper surface was peeled off was observed. This is because the fixed brush is pressed against the paper surface. On the other hand, since the paper dust removing device according to the present invention is disposed away from the paper surface, there is no damage on the paper surface.

  In the present invention, paper powder generated when cutting a paper roll manufactured by a paper machine into a narrow roll paper with a slitter knife such as a cutter device is in contact with the paper sheet while running the paper sheet after cutting. It can be removed without any problem, and the white spot phenomenon is reduced when printing on the paper sheet.

FIG. 2 is a schematic structural view showing a second preferred embodiment of the paper dust removing apparatus according to the present invention, which shows an improvement over the first embodiment having the basic structure shown in FIG. 1 is a schematic structural diagram showing a first embodiment provided with a basic structure of a paper dust removing apparatus according to the present invention. It is a block diagram explaining the process of removal and collection | recovery of paper dust by the paper dust removal apparatus which concerns on this invention. It is a side view which expands and shows the vicinity of a slitter part. It is an AA arrow line view in FIG. It is a front view which shows the external appearance of a paper dust removal apparatus. It is sectional drawing of the side which shows the external appearance and structure of a paper dust removal apparatus. It is a figure explaining the supply / exhaust of a paper dust removal apparatus, and is a system diagram corresponding to the block diagram of FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a cutter device suitable for mounting a paper dust removing device according to the present invention with a part thereof omitted, showing a schematic structure. It is a comparison table | surface of the paper dust removal effect of the paper dust removal apparatus which concerns on this invention, and a fixed brush type paper dust removal apparatus, and also describes the case where the paper powder removal process is not performed.

Explanation of symbols

P Winding paper L Paper sheet D Paper dust 2 Slitter part 8 Air supply device 9 Dust removal device
10 Suction device
24 Slitter knife
30 Paper dust remover
30a Paper dust removal device
30b Paper dust removal device
31a Nozzle (Air blowing means)
31b Nozzle (air blowing means)
32a Guide part (air guide means)
32b Guide part (air guide means)
33a Air recovery part (air recovery means)
33b Air recovery part (air recovery means)
34 Callout guide board
35 Collection guide plate
40 Callout header
41 Callout room
42 Chamber room
43 Rectifier plate
44 Pipe
45 Air supply duct
50 Suction header
51 Suction duct

Claims (7)

In a paper dust removing device that removes paper dust adhering to the surface from a running paper sheet,
Air blowing means for blowing out processing air toward the anti-running direction on the surface of the running paper sheet;
Air guiding means for guiding the flow direction of the processing air blown from the air blowing means;
An air collecting means for sucking and collecting the processing air guided by the air guiding means;
Ambient air is attracted in accordance with the flow of the processing air, the paper dust on the surface of the paper sheet is floated by the attracted ambient air, and the processing air and the ambient air that are sucked and recovered by the air recovery means And a paper dust removing device which sucks the paper dust together. The air guide means is formed as a curved surface having a process air flow position side convex with the direction parallel to the plane including the blowout range of the process air as an axial direction,
A blowing guide plate for guiding the processing air blown out from the air blowing means by extending in a direction parallel to the tangent line of the curved surface at 0 ° to 90 °, preferably approximately 45 ° with respect to the surface of the paper sheet;
The recovery guide plate for guiding the processing air guided by the air guiding means and the ambient air accompanied by the processing air to a recovery port of the air recovery means is provided. Paper dust removal device.   The paper according to claim 2, wherein the collection guide plate is extended in a direction parallel to a tangent to the curved surface at 0 ° to 90 °, preferably about 45 ° with respect to the surface of the paper sheet. Powder removal device.   The paper dust removing device according to any one of claims 1 to 3, wherein the air blowing unit, the air guiding unit, and the air collecting unit are provided on the downstream side of the slitter unit of the cutter device.   The paper dust removing apparatus according to any one of claims 1 to 4, wherein the air blowing means, the air guiding means, and the air collecting means are provided at a distance of 10 mm or more from the surface of the paper sheet.   2. The air blowing means, the air guiding means, and the air recovery means are provided separately corresponding to the slits, and supported so as to be slidable in a direction parallel to the width direction of the paper sheet. Or the paper dust removal apparatus of Claim 5 thru | or 5. 6. The paper blower according to claim 1, wherein the air blowing means, the air guiding means, and the air collecting means are provided continuously in the width direction of the paper sheet to remove paper dust over the entire area of the paper sheet. The paper dust removal apparatus in any one.

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