Web smoothing device and papermaking device

Abstract

To provide a web smoothing device and a papermaking device solving the above-mentioned problems, capable of smoothing a web while reducing an occupied area of the device.SOLUTION: A web smoothing device of the present invention is assembled with a belt 48 for transporting a web W, a rotor 50 sandwiching and rotating the web W transported by the belt 48 with peripheral surfaces between the belt 48 and itself, a heating part 62 provided in the rotor 50 for heating the web W, a separation part 71 for separating the belt 48 from the web W in a prescribed range of the peripheral surfaces, and a pressure roller 75 for pressing the web W to the peripheral surfaces in the separation part 71 under a prescribed pressure. Also, in the constitution, the pressure roller 75 extends along a crosswise direction orthogonal to a longer direction of the web W, and a length of a pressing part of the pressure roller 75 which presses the web W in the crosswise direction is formed shorter than the length of the web in the crosswise direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a papermaking machine and a method for dewatering a wet paper. [Background technology]

[0002] Regarding a mechanism for smoothing a web, Patent Document 1 below discloses a mechanism in which a wet paper web that has been dewatered by a felt is transferred to a smooth belt for transport and pressed by a press roller. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5599234 Summary of the Invention [Problem to be solved by the invention]

[0004] The device described in Patent Document 1 is large-scale because the wet paper is dehydrated using a felt.

[0005] SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to provide a web smoothing device and a papermaking machine that are capable of smoothing a web while reducing the footprint of the device. [Means for solving the problem]

[0006] In order to achieve the above object, the web smoothing device of the present invention comprises a belt for transporting a web, a rotating body that rotates while clamping the web transported by the belt between the belt and the rotating body on its circumferential surface, a heating section provided on the rotating body for heating the web, a separation section that separates the belt from the web within a predetermined range of the circumferential surface, and a pressure roller that presses the web against the circumferential surface with a predetermined pressure in the separation section.

[0007] In addition, in the above configuration, the pressure roller extends along a width direction perpendicular to the longitudinal direction of the web, and the length of the pressure portion of the pressure roller that presses the web in the width direction is formed shorter than the length of the web in the width direction.

[0008] In each of the above configurations, the pressure roller extends along a width direction perpendicular to the longitudinal direction of the web, and the width length of the pressure roller is formed longer than the width length of the cut material produced by cutting and removing both widthwise end portions of the web along the longitudinal direction in a cutting section installed downstream of the rotating body.

[0009] Furthermore, in each of the above configurations, an attachment portion is provided that is located a predetermined distance upstream of the separation portion in the web transport direction and that attaches the leading end portion of the web to the peripheral surface.

[0010] Furthermore, in each of the above configurations, the attachment portion is provided on a single roller over which the belt is passed, the roller is positioned opposite the circumferential surface, a gap is formed between the belt passed over the roller and the circumferential surface, and the size of the gap is greater than the thickness of the portion following the leading end portion of the web.

[0011] Furthermore, in each of the above configurations, a detection unit is provided for detecting abnormal transport of the web.

[0012] Furthermore, in each of the above configurations, a jam control unit is provided that controls the operation of the rotating body so as to rotate the rotating body in the reverse direction when the detection unit detects a transport failure due to a jam of the web on the circumferential surface.

[0013] Furthermore, in each of the above configurations, an adjustment unit is provided that adjusts the pressure of the pressure roller on the web, and a pressure control unit is provided that controls the adjustment unit based on the detection result of the detection unit.

[0014] Furthermore, in each of the above configurations, the pressure control unit controls the pressure roller to weaken the pressure when the detection unit detects that the portion of the web subsequent to the leading end portion has moved away from the peripheral surface upstream of the pressure roller by more than a predetermined value.

[0015] Furthermore, in each of the above configurations, the web contains a predetermined proportion of moisture.

[0016] Furthermore, the papermaking machine according to the present invention is provided with a web smoothing device having any of the above-described configurations. [Effects of the Invention]

[0017] According to the present invention, a belt for transporting a web, a rotating body that rotates while clamping the web transported by the belt between the belt and the rotating body on its circumferential surface, a heating unit provided on the rotating body for heating the web, a separation unit that separates the belt from the web within a predetermined range on the circumferential surface, and a pressure roller that presses the web against the circumferential surface with a predetermined pressure in the separation unit, so that the web can be pressed by the pressure roller against the circumferential surface of the rotating body equipped with the heating unit, thereby smoothing the web. Furthermore, the simple configuration allows for a small footprint of the device.

[0018] The pressure roller extends along a width direction perpendicular to the longitudinal direction of the web, When the widthwise length of the pressing portion of the pressing roller that presses the web is formed shorter than the widthwise length of the web, the pressing portion does not press both widthwise end portions of the web, thereby preventing both widthwise end portions of the web from sticking to the rotating body and making peeling difficult.

[0019] The pressure roller extends along a width direction perpendicular to the longitudinal direction of the web, and when the width length of the pressure roller is formed to be longer than the width length of the cut material produced by cutting and removing both widthwise end portions of the web along the longitudinal direction in a cutting section installed downstream of the rotating body, the smoothness of the cut material obtained by cutting is maintained, resulting in a beautiful finish.

[0020] Furthermore, if an attachment section is provided which is installed at a position a predetermined distance upstream of the separation section in the web conveying direction and which attaches the leading end portion of the web to the circumferential surface, even if the belt separates from the web at the separation section, the attachment section can reliably cause the leading end portion of the web to adhere to the circumferential surface of the rotating body, and the web can be pressed and smoothed by the pressure roller.

[0021] Furthermore, the attachment portion is provided on a single roller over which the belt is passed, the roller being positioned opposite the circumferential surface, and a gap being formed between the belt passed over the roller and the circumferential surface, and when the size of the gap is greater than the thickness of the portion of the web following the tip portion, the tip portion of the web can be more reliably attached to the circumferential surface and the formation of belt irregularities in the subsequent portion of the web can be suppressed.

[0022] Furthermore, if a detection unit for detecting abnormal transport of the web is provided, the detection unit can detect abnormal transport of the web.

[0023] Furthermore, if the detection unit is equipped with a jam control unit that controls the operation of the rotating body to rotate it in the reverse direction when it detects poor transport due to a jam of the web on the circumferential surface, the jam can be properly handled by transporting the leading end of the web back upstream.

[0024] Furthermore, if an adjustment unit is provided that adjusts the pressing force of the pressure roller on the web, and a pressing control unit is provided that controls the adjustment unit based on the detection results of the detection unit, the pressing force can be adjusted when abnormal transport of the web occurs due to the pressure of the pressure roller.

[0025] Furthermore, when the detection unit detects that the portion of the web subsequent to the leading end has moved away from the peripheral surface upstream of the pressure roller by more than a predetermined value, the pressure control unit controls the pressure of the pressure roller to be weakened, thereby automatically resolving web transport problems.

[0026] Furthermore, when the web contains a predetermined amount of moisture, the smoothness of the web can be easily improved by pressing the web containing moisture with a pressure roller.

[0027] Furthermore, since the papermaking machine according to the present invention is equipped with the web smoothing device having each of the above configurations, it is possible to improve the smoothness of the paper obtained by papermaking. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a schematic diagram illustrating the configuration of a papermaking apparatus including a papermaking apparatus according to one embodiment of the present invention. [Figure 2] FIG. 2 is a vertical cross-sectional view showing a schematic configuration of the papermaking apparatus. [Figure 3] FIG. 2 is a partially enlarged view of the vicinity of a web smoothing device of the papermaking machine. [Figure 4] FIG. 2 is a diagram illustrating a web smoothing device. [Figure 5] FIG. 2 is a diagram illustrating a mode of use of the papermaking apparatus. DETAILED DESCRIPTION OF THE INVENTION

[0029] (First embodiment) Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of a papermaking machine equipped with a papermaking machine according to a first embodiment. The papermaking machine shown in FIG. 1 is a waste paper recycling processing device 100 that uses waste paper 10 as papermaking raw material. In FIG. 1, the waste paper recycling processing device 100 comprises a recycled pulp production unit 1, a de-inking unit 2, a papermaking unit 3, a cutting unit 4, and a control unit 9 that controls each unit. In the following first to fourth embodiments, a papermaking device Q according to the present invention is described as being used in the papermaking unit 3 of the waste paper recycling processing device 100 that produces cut material 7 using waste paper 10 as raw material, but this is not necessarily limited to this, and it may also be used in the papermaking unit of a papermaking machine that uses other pulp raw materials such as wood as papermaking raw material.

[0030] The recycled pulp manufacturing unit 1 disintegrates waste paper 10 to produce a pulp suspension. The deinking unit 2 deinks the pulp suspension produced in the recycled pulp manufacturing unit 1. The papermaking unit 3 makes paper from the deinked pulp suspension obtained in the deinking unit 2 to form a web W, and dewaters and dries the obtained web W. The cutting unit 4 cuts the uncut web W obtained in the papermaking unit 3 to perform finishing, thereby obtaining cut pieces 7 of a standard size. The control unit 9 controls the operation of the entire waste paper recycling processing device 100. The recycled pulp manufacturing unit 1 and the deinking unit 2 can utilize publicly known recycled pulp manufacturing equipment and deinking equipment, respectively.

[0031] 2 is a longitudinal cross-sectional view showing the schematic configuration of the papermaking device Q and cutting unit 4 that make up the papermaking unit 3. The papermaking unit 3 is configured by housing a web forming unit 11, a dewatering unit 14, and a drying unit 15 in a housing (not shown). A pair of left and right side plates (not shown) are arranged inside the housing, and these side plates rotatably support most of the rollers that make up each unit.

[0032] A web W is formed in the web forming unit 11. The web forming unit 11 includes a head box 12 and a wire unit 13. The head box 12 is used to uniformly supply the deinked pulp suspension onto the papermaking wire 23. The head box 12 includes a storage unit 18 that stores the pulp suspension, an outlet unit 19 that causes the pulp suspension stored in the storage unit 18 to flow out onto the papermaking wire 23, and an inlet unit 20 for the pulp suspension formed at the bottom of the storage unit 18.

[0033] The inlet section 20 is connected to a transport pump (not shown) for taking out the deinked pulp suspension from the deinking section 2 and sending it to the storage section 18.

[0034] The wire section 13 includes a papermaking wire 23 and a wire drive section (not shown) that runs the papermaking wire 23. The papermaking wire 23 is stretched and stretched across multiple belt rollers 24, forming an endless wire. The papermaking wire 23 runs upward at a curved section 21 provided near the downstream end of the forward track running on the upper side, bending at an angle of approximately 5° to 85° with respect to the horizontal plane.

[0035] The papermaking wire 23 filters the pulp suspension supplied from the head box 12 to form a web W. A plurality of water-repelling plates 26 are arranged at predetermined intervals below the papermaking wire 23 on the outward track running above. The water-repelling plates 26 drain the pulp suspension. Each water-repelling plate 26 extends in the width direction, which intersects with the running direction of the papermaking wire 23, and is in sliding contact with the underside of the papermaking wire 23. This allows the water-repelling plates 26 to guide white water, which is the liquid that flows down through the mesh of the papermaking wire 23, downward.

[0036] In addition, a water receiving section 27 is provided below the draining board 26 to receive white water that flows down from the draining board 26 or directly from the mesh of the papermaking wire 23. The water receiving section 27 is connected to a white water tank 29 installed below by piping, guides, etc. (not shown). The white water tank 29 is equipped with piping and a white water circulation pump (not shown) for sending the white water stored therein to the recycled pulp production section 1 and the de-inking section 2, and is configured so that the white water recovered in the water receiving section 27 can be reused.

[0037] The dewatering section 14 includes a dewatering roller 45. The dewatering roller 45 is installed in a curved portion 21 that curves upward on the papermaking wire 23. The dewatering roller 45 also serves as the belt roller 24 around which the papermaking wire 23 is stretched.

[0038] The dewatering roller 45 is connected to the wire drive unit via a connection mechanism, and is driven to rotate in synchronization with the other rollers 24 around which the papermaking wire 23 is wound.

[0039] The material of dewatering roller 45 can be metal such as stainless steel, iron, or aluminum; synthetic resin such as urethane, nylon, polypropylene, polyethylene, polyethylene terephthalate, vinyl chloride, EPDM, ABS resin, or fluororesin; a combination of these materials formed into layers; or a combination of either or both of metal and synthetic resin with synthetic or natural fibers.

[0040] Of these, strength can be ensured by using metal for dewatering roller 45. The web W formed by filtering with papermaking wire 23 has a relatively high moisture content before and after dewatering in dewatering section 14, so sticking is unlikely to occur even if dewatering roller 45 is made of metal. However, by using a silicone resin or a fluorine-based resin for dewatering roller 45, or a roller surface-treated with these, the peelability of web W is improved.

[0041] 2 includes a belt 48, a rotor 50, a heating section 62, a smoothing section 70, a temperature sensor 66, and a peeling section 55. The belt 48 transports the web W handed over from the papermaking wire 23. The belt 48 is formed endlessly and is stretched over the rotor 50 and a plurality of rollers 49.

[0042] The belt 48 is wound counterclockwise from the left side in FIG. 2 to the top of the circumferential surface of the rotating body 50. The belt 48 runs on the left side of the rotating body 50 in FIG. 2, protruding upward so as to face the papermaking wire 23, which runs protruding upward. The papermaking wire 23 and the belt 48 are arranged at the opposing positions, spaced a predetermined distance apart without contacting each other. The belt 48 has a transfer section 47 where the web W is transferred from the papermaking wire 23. The transfer section 47 is provided near a change position T where the running direction of the papermaking wire 23 is changed. The transfer section 47 is provided at a position where the belt 48 changes its running direction. The belt 48 is driven to run by a belt drive section (not shown).

[0043] The belt 48 transports the web W. The belt 48 transports the web W by clamping it between itself and the rotor 50 within the range where the belt 48 is wound around the rotor 50. The material of the belt 48 is not particularly limited, and examples thereof include metal, synthetic fibers such as polyester and polyphenylene sulfide, and natural fibers such as hemp and cotton. The belt 48 is preferably formed from a fabric woven with warp and weft yarns, as this provides high drying efficiency for the web W.

[0044] The belt 48 travels in a circular motion. The belt 48 is separated from the web W at a separation portion 71 provided in the smooth portion 70. An inner roller 73 is provided inside the belt 48, and a retraction roller 72 that retracts the belt 48 from the rotating body 50 is provided outside the belt 48.

[0045] The rotating body 50 rotates while sandwiching the web W, which is conveyed by the belt 48, between the rotating body 50 and the belt 48 on its circumferential surface. The rotating body 50 includes a cylindrical body 58 formed in a hollow cylindrical shape. The left and right sides of the cylindrical body 58 are closed by disk-shaped lid bodies 59. The cylindrical body 58 is rotatably supported by a plurality of support rollers 61. The support rollers 61 are installed inside the belt 48, which travels in a circular motion. The cylindrical body 58 rotates in response to the belt 48 being driven to travel by a belt drive unit.

[0046] The heating unit 62 is provided on the rotating body 50. The heating unit 62 heats the web W. FIG. 2 shows a case where the heating unit 62 is installed on the inner circumferential surface of the cylindrical body 58. The type and shape of the heating unit 62 are not limited, but the heating unit 62 can be configured, for example, by a soft, flexible silicone rubber heater formed in a sheet shape. The heating unit 62 is attached to the inner circumferential surface of the rotating body 50 over the entire circumference.

[0047] The smoothing unit 70 improves the smoothness of the web W. The smoothing unit 70 constitutes a web smoothing device. The smoothing unit 70 is provided in the lower left portion of the rotating body 50 in FIG. 2. FIG. 3 is a partially enlarged view of the smoothing unit 70 and its surroundings. The smoothing unit 70 includes a separation unit 71, a pressure roller 75, an adjustment unit 77, a detection unit 76, and an adhesion unit 67.

[0048] The separation unit 71 is a mechanism that separates the belt 48 from the web W within a predetermined range on the circumferential surface of the rotating body 50. The separation unit 71 includes a plurality of retraction rollers 72. The retraction rollers 72 are installed outward of the belt 48 that runs in a circular motion. The retraction rollers 72 are installed upstream and downstream in the running direction of the belt 48, with a pressure roller 75 interposed therebetween. The retraction rollers 72 partially separate the belt 48, which runs while sandwiching the web W between itself and the rotating body 50, from the rotating body 50. The retraction rollers 72 cause the belt 48 to run in a retracted position in the smooth section 70.

[0049] The pressure roller 75 presses the web W against the circumferential surface of the rotating body 50 at a predetermined pressure in the separation section 71. The pressure roller 75 extends along the width direction H that is perpendicular to the longitudinal direction of the web W. The pressure roller 75 includes a pressing portion 85 and a rotating shaft 84. The pressing portion 85 presses the web W. Figure 4 is a diagram for explaining the length of the pressure roller 75 in the width direction H, and is a diagram of the pressure roller 75, a support roller 611 installed above the pressure roller 75, and the rotating body 50 as seen from the rear. For convenience of explanation, the belt 48 is shown in Figure 4 by a dashed line.

[0050] The length Lr of the pressing portion 85 in the width direction H is formed to be shorter than the length Lw of the web W in the width direction H, which is indicated by the thin solid line. As a result, the left and right side edge regions E of the web W in the width direction H are not pressed by the pressing roller 75.

[0051] In addition, the length Lr of the pressure roller 75 in the width direction H is longer than the length Ls of the cut material 7 in the width direction H, which is produced by cutting and removing both side end portions E of the web W in the width direction H along the longitudinal direction in the cutting section 4 installed downstream of the rotating body 50.

[0052] The side edge portions E of the web W are cut in the cutting section 4 installed downstream of the rotor 50 and either discarded or reused for recycling. Therefore, there is no need to smooth the side edge portions E. However, the fiber condition and thickness of the side edge portions E are unstable, resulting in localized thickening and thinning. If the side edge portions E stick to the rotor 50 during drying, it becomes difficult to peel the web W from the rotor 50 after drying. If the side edge portions E cannot be properly peeled from the rotor 50 in the cutting section 4, the subsequent web W may not be peeled from the location of the unpeeled side edge portion E, and may wind around the rotor 50. Furthermore, if there are clumps of fibers in the side edge portions E of the web W, pressing the fibers with the pressure roller 75 may cause them to adhere to the rotor 50.

[0053] Therefore, even when the web W is pressed by the pressure roller 75 to smooth the web W, by making the length Lr of the pressure roller 75 in the width direction H shorter than the length Lw of the web W in the width direction, the pressure roller 75 does not press the side end portions E of the web W, and the side end portions E of the web W do not stick to the rotating body 50. Furthermore, even if there are clumps of fibers in the side end portions E of the web W, such fibers can be easily peeled off from the rotating body 50 by bringing a scraper or the like into contact with the rotating body 50 at the peeling section 55.

[0054] The adjustment unit 77 adjusts the pressing force of the pressure roller 75 on the web W. The adjustment unit 77 includes a drive unit (not shown), a cam 78, a cam follower 79, an elastic member 81, and a bearing 82. The cam 78 rotates when driven by the drive unit. The cam follower 79 is installed so as to be movable toward and away from the rotating body 50 as the cam 78 rotates. A portion of the cam follower 79 abuts against the cam 78. Another portion of the cam follower 79 engages one end of an elastic member 81 such as a spring. The other end of the elastic member 81 is engaged with the bearing 82. The bearing 82 rotatably supports a rotation shaft 84 of the pressure roller 75.

[0055] The detection unit 76 detects abnormal conveyance of the web W. The detection unit 76 can detect conveyance failures due to jamming of the web W on the circumferential surface of the rotating body 50. The detection unit 76 can also detect when a portion K of the web W following the leading edge thereof has separated from the circumferential surface of the rotating body 50 by a predetermined distance or more on the upstream side of the pressure roller 75. When the pressure roller 75 presses the web W for a predetermined time or more, moisture gradually accumulates on the upstream side of the pressure roller 75. When excess moisture accumulates on the upstream side of the pressure roller 75, as shown in FIG. 5, the web W may eventually locally separate from the circumferential surface of the rotating body 50, causing sag D. At this time, moisture accumulates between the circumferential surface of the rotating body 50 and the peeled web W. The detection unit 76 detects when the web W has separated from the circumferential surface of the rotating body 50 by a predetermined distance or more.

[0056] The configuration of the detection unit 76 is not particularly limited, and for example, a transmission sensor consisting of a light-emitting element and a light-receiving element can be used. The light-emitting element and the light-receiving element are installed upstream of the pressure roller 75, spaced apart on both sides of the rotating body 50 in the width direction H, as shown in FIG. 4. The light beam from the light-emitting element to the light-receiving element passes through a position at a distance N from the peripheral surface of the rotating body 50 of, for example, 0.1 mm to 50 mm, preferably 5 mm to 30 mm, and more preferably 10 mm to 20 mm. As a result, light is transmitted when the web W is being transported normally, and is blocked when a jam of the web W occurs or when the web W is separated from the peripheral surface by more than a predetermined distance.

[0057] The adhesion portion 67 is provided at a position a predetermined distance upstream of the separation portion 71 in the transport direction of the web W, and adheres the leading end portion G of the web W to the circumferential surface of the rotating body 50. 2 and 4 show the case where the adhesion portion 67 is provided on a support roller 611 that supports the rotating body 50 upstream of the installation position of the pressure roller 75 in the transport direction of the web W.

[0058] The support roller 611 is shown above the pressure roller 75 in FIG. 4. The support roller 611 extends along the width direction H. The support roller 611 is formed so that its diameter is larger at both ends in the width direction H and the diameter of the portion between them is smaller than those at both ends. The support roller 611 includes a support portion 63 and an attachment portion 67. The support portions 63 are provided at both ends of the support roller 611 that are formed so as to have a larger diameter. The support portion 63 supports the rotating body 50 via the belt 48. The attachment portion 67 is provided between the pair of left and right support portions 63. The attachment portion 67 is formed so as to have a smaller diameter than the support portions 63.

[0059] 3, a gap M is formed between the surface of the belt 48 wrapped around the attachment portion 67 and the circumferential surface of the rotating body 50. Therefore, the attachment portion 67 does not come into contact with the circumferential surface of the rotating body 50 via the belt 48. The size of the gap M is set to be smaller than the thickness of the leading end portion G of the web W and larger than the thickness of the trailing portion K.

[0060] When the leading end portion G of the web W passes the installation position of the attachment section 67, the leading end portion of the web W is pinched and pressed between the circumferential surface of the rotating body 50 and the belt 48. On the other hand, when the portion K of the web W subsequent to the leading end portion G passes the installation position of the attachment section 67, the gap M is not pinched between the circumferential surface of the rotating body 50 and the belt 48.

[0061] For example, when the thickness of the leading end portion G of the web W is approximately 1.5 mm to 2.0 mm, the thickness of the portion K subsequent to the leading end portion G of the web W is 0.3 mm to 0.5 mm, and the thickness of the belt 48 is 0.7 mm, the gap M from the belt 48 to the peripheral surface of the rotating body 50 can be set to 0.7 mm.

[0062] As shown in FIG. 2 , the temperature sensor 66 is installed at the upper rear of the rotating body 50. The temperature sensor 66 detects the surface temperature of the cylindrical body 58. In this embodiment, the temperature sensor 66 is configured to be in sliding contact with the surface of the cylindrical body 58 and detect the temperature of the cylindrical body 58, but a sensor that does not contact the cylindrical body 58 may also be used. The peeling unit 55 is installed at the upper rear of the rotating body 50, upstream of the temperature sensor 66 in the rotation direction of the rotating body 50. The peeling unit 55 is configured by a scraper. The peeling unit 55 peels the dried web W from the belt 48 and guides the web W to the cutting unit 4.

[0063] (Cutting section) The cutting unit 4 shown in FIG. 1 has a cutting blade 43 that cuts the web W into a predetermined sheet size. The cutting blade 43 has a pair of left and right slitters 41 and a cutter 42. The slitter 41 is composed of a round blade. The cutter 42 is composed of a pair of upper and lower straight blades extending in the width direction. A scrap collection box (not shown) is installed below the cutting blade 43 to collect scraps generated by cutting.

[0064] (Control unit) The control unit 9 controls the overall operation of the waste paper recycling processing device 100. The control unit 9 includes a jam control unit 91 and a pressing control unit 92. When the detection unit 76 detects a transport failure due to a jam of the web W on the circumferential surface of the rotating body 50, the jam control unit 91 controls the operation of the rotating body 50 to rotate the rotating body 50 in the reverse direction. The pressing control unit 92 controls the adjustment unit 77 based on the detection result of the detection unit 76. The pressing control unit 9 can then control the pressing roller 75 to weaken the pressing force when the detection unit 76 detects that a portion K following the leading end of the web W has moved away from the circumferential surface of the rotating body 50 by more than a predetermined value on the upstream side of the pressing roller 75.

[0065] The control unit 9 can control the temperature of the heating unit 62 of the rotating body 50 and the rotation speed of the rotating body 50 while the leading end portion G of the web W passes through the adhesion unit 67. This allows adjustment so that the leading end portion G of the web W adheres appropriately to the circumferential surface of the rotating body 50.

[0066] (action) The operation of the waste paper recycling processing device 100 according to this embodiment will be described below. First, in the recycled pulp production unit 1, a pulp suspension is produced by stirring a predetermined amount of waste paper 10 with a predetermined amount of water for a predetermined time. Next, the resulting pulp suspension is sent to the deinking unit 2, where it is deinked to obtain a deinked pulp suspension. Water is added to the deinked pulp suspension in the deinking unit 2 or at a location along the distribution path from the deinking unit 2 to the papermaking unit 3 to adjust it to a predetermined pulp consistency suitable for papermaking, and the resulting suspension is sent to the headbox 12 of the papermaking unit 3.

[0067] The pulp suspension flows into the storage section 18 from the inlet section 20 of the head box 12. The pulp suspension then flows out from the outlet section 19 onto the papermaking wire 23. The liquid portion of the pulp suspension supplied onto the papermaking wire 23 passes through the mesh of the papermaking wire 23. The liquid portion of the pulp suspension is then guided by a draining plate 26 at a position inside the papermaking wire 23 to a water receiving section 27 below, and after being received in the water receiving section 27, is stored in a white water tank 29. The white water in the white water tank 29 is sent to the recycled pulp production section 1, the deinking section 2, etc., and is reused.

[0068] The pulp remaining on the papermaking wire 23 is formed as a web W, which is a layer of fibers containing a predetermined percentage of moisture. The control unit 9 controls the thickness of the leading end portion of the web W formed on the papermaking wire 23 so that it is thicker than the thickness of the portion K following the leading end portion.

[0069] For this reason, the control unit 9 controls the wire drive unit so that the running speed of the papermaking wire 23 when forming the leading edge portion of the web W is slower than when forming the portion K subsequent to the leading edge portion of the web W. Alternatively, the control unit 9 may start supplying the pulp suspension from the head box 12 onto the papermaking wire 23, and control the papermaking wire 23 to stop running for a predetermined time when forming the leading edge portion of the web W. Furthermore, the control unit 9 may control the driving amount of the transport pump so that it is greater when forming the leading edge portion of the web W than when forming the portion K subsequent to the leading edge portion of the web W, thereby increasing the amount of pulp suspension flowing into the inlet unit 19 and thickening the leading edge portion of the web W.

[0070] After the leading end portion of the web W is formed, when this leading end region reaches the dewatering section 14, the web W is sandwiched between the dewatering roller 45 and the papermaking wire 23, which runs in a curved upward direction along the outer peripheral surface of the dewatering roller 45, and is dewatered. The web W on the papermaking wire 23 running horizontally is pressed from above by the dewatering roller 45, and is sandwiched between the papermaking wire 23, so that the liquid contained in the web W is guided downward on the papermaking wire 23. The web W is then gradually dewatered between the papermaking wire 23, which runs in a curved direction along the outer peripheral surface of the dewatering roller 45. The web W is pressed by the tension of the papermaking wire 23.

[0071] The leading end portion G of the web W is formed thick, and is given a certain degree of stiffness by being dewatered in the dewatering section 14. When the leading end portion G of the web W reaches the turning position T of the papermaking wire 23, it is separated from the papermaking wire 23 and is transported independently diagonally upward and to the upper right as shown by the solid line in FIG.

[0072] When the length of the tip portion G of the web W extending upward from the papermaking wire 23 reaches a predetermined length, the tip portion G of the web W buckles under its own weight, as shown by the two-dot chain line, and is supported by the belt 48 facing the papermaking wire 23. The tip portion G of the web W enters between the belt 48 and the rotating body 50, and is sandwiched between the belt 48 and the rotating body 50 at the contact point between them and is transported.

[0073] When the leading end portion G of the web W reaches the installation position of the support roller 611, it is sandwiched between the adhesion portion 67 of the support roller 611 and the circumferential surface of the rotating body 50. Since the gap M between the circumferential surface of the rotating body 50 and the belt 48 is set to be smaller than the thickness of the leading end portion G of the web W, the leading end portion G of the web W is sandwiched and conveyed together with the belt 48 between the adhesion portion 67 of the support roller 611 and the circumferential surface of the rotating body 50, and is pressed.

[0074] In this way, by pressing the web W against the circumferential surface of the rotor 50 by the adhesion section 67, the leading end portion G of the web W is sufficiently pressed against the rotor 50, which has been heated to a predetermined temperature. The moisture contained in the leading end portion G of the web W is heated and evaporates in a short time. This allows the leading end portion G of the web W to easily adhere to and stick to the rotor 50. Thereafter, even when the leading end portion G of the web W is transported downstream from the installation position of the adhesion section 67 and the belt 48 separates from the rotor 50 at the separation section 71, the leading end portion G of the web W can remain stuck to the circumferential surface of the rotor 50. This prevents the leading end portion G of the web W from separating from the circumferential surface of the rotor 50 at the separation section 71 and becoming unable to be properly transported.

[0075] On the other hand, the portion K of the web W following the leading end portion G is formed thinner than the leading end portion G. At the position where the attachment portion 67 is installed, the gap M between the circumferential surface of the rotating body 50 and the belt 48 is set larger than the thickness of the trailing portion K of the web W. If the trailing portion K of the web W were to come into contact with and be pressed against the circumferential surface of the rotating body 50 by the attachment portion 67 via the belt 48, the uneven pattern on the surface of the belt 48 could be deeply imprinted on the moisture-rich web W. However, in this embodiment, a gap M larger than the thickness of the trailing portion K of the web W is formed between the circumferential surface and the belt 48, so the attachment portion 67 does not press the trailing portion K against the circumferential surface of the rotating body 50 via the belt 48. This allows for a more beautiful surface finish of the cut material 7 obtained after cutting. Since there is no need to provide a retraction mechanism for the support roller 611 to prevent the belt 48 from contacting the web W, costs can be reduced.

[0076] In the separation section 71, the belt 48 separates from the web W and travels while contacting the retraction roller 72. Meanwhile, the leading end portion G of the web W remains attached to the circumferential surface of the rotating body 50 and is transported downstream as the rotating body 50 rotates. When the leading end portion G of the web W reaches the installation position of the pressing roller 75, the pressing roller 75 pinches and presses the leading end portion G of the web W between itself and the rotating body 50.

[0077] The length Lr of the width direction H along which the pressure roller 75 presses the web W is shorter than the length Lw of the width direction H of the web W. As a result, the pressure roller 75 does not press the side end portions E of the web W in the width direction H with a predetermined pressure, and therefore it is possible to avoid a situation in which the side end portions E stick to or become stuck to the rotating body 50, making it difficult to peel off, due to pressing the side end portions E in the width direction H of the web W, which has an unstable fiber amount.

[0078] Furthermore, the length Lr of the pressure roller 75 in the width direction H is longer than the length Ls of the cut material 7 in the width direction H, which is produced by cutting and removing both side end portions E of the web W in the lengthwise direction in the cutting section 4 installed downstream of the rotating body 50, so the quality of the cut material 7 obtained is not compromised.

[0079] When the time that the pressure roller 75 presses the web W exceeds a predetermined time, moisture gradually accumulates upstream of the pressure roller 75, and the detection unit 76 detects that the portion K following the leading end of the web W is separated from the circumferential surface of the rotating body 50 upstream of the pressure roller 75 by more than a predetermined distance, causing slack D, the pressure control unit 92 controls the adjustment unit 77. Then, the pressure control unit 92 can control the pressure of the pressure roller 75 to be weakened.

[0080] Specifically, the pressing control unit 92 drives the drive unit by a predetermined amount. When the cam 78 rotates by a predetermined amount in response to the drive unit being driven, the cam follower 79 moves in a direction away from the rotating body 50. The movement of the cam follower 79 loosens the compressed state of the elastic member 81, and the pressing force of the pressing roller 75 journaled by the bearing 82 on the web W is reduced by a predetermined amount.

[0081] In this manner, the papermaking operation continues with the pressure of the pressure roller 75 on the web W weakened. If the detection unit 76 still detects the slack D of the web W after a predetermined time has elapsed, the control unit 9 drives the drive unit again and controls the pressure of the pressure roller 75 on the web W to be further weakened.

[0082] Thereafter, the pressing control unit 92 similarly checks the presence or absence of slack D in the web W using the detection unit 76 at predetermined time intervals and controls the drive unit based on the results. The pressing control unit 92 gradually reduces the pressing force of the pressing roller 75 while the detection unit 76 detects slack D in the web W from the circumferential surface of the rotating body 50. Then, when the detection unit 76 no longer detects this slack D, the pressing control unit 92 controls the pressing roller 75 to gradually increase the pressing force in a manner opposite to that used to reduce the pressing force. This prevents a sudden decrease or increase in the pressing force on the web W. Furthermore, peeling of the web W from the circumferential surface of the rotating body 50 can be automatically eliminated while maintaining the minimum necessary pressing force of the pressing roller 75. Furthermore, the smoothness of the resulting cut material 7 does not suddenly change, allowing high quality to be maintained.

[0083] When the detection unit 76 detects a transport failure due to a jam of the web W on the circumferential surface of the rotating body 50, the jam control unit 91 controls the operation of the rotating body 50 to rotate the rotating body 50 in the reverse direction. The attachment unit 67, the separation unit 77, and the pressure roller 75 are installed in the vicinity thereof, and the components constituting the mechanism are installed close to one another, resulting in a narrow space, and there is a risk of a transport failure occurring due to a jam of the web W. Furthermore, if a jam of the web W occurs and the rotation of the rotating body 50 is stopped, it is difficult for the user to remove the jammed web W by themselves.

[0084] Furthermore, if the rotating body 50 does not stop and continues to rotate normally despite the occurrence of a jam of the web W, the leading end portion G of the web W will become thinner and the trailing portion K will become thicker, forming a wedge shape overall, which may make recovery extremely difficult. Therefore, when the detection unit 76 detects a transport failure due to a jam of the web W on the circumferential surface of the rotating body 50, the jam control unit 91 controls the operation of the rotating body 50 to rotate the rotating body 50 in the reverse direction. As a result, the web W is sequentially moved upstream as the rotating body 50 rotates in the reverse direction.

[0085] When the leading end portion G of the web W is sent back upstream of the support roller 611, it is released from being clamped between the belt 48 and the circumferential surface of the rotating body 50. Because there is a larger space upstream of the support roller 611 than at the adhesion portion 67, the separation portion 77, and the pressure roller 75, the user can easily remove the web W that has become unsuccessful in conveyance. This makes it possible to avoid situations that are difficult to recover from due to a jam of the web W.

[0086] The web W is heated and dried in the heating section 62. The temperature of the rotating body 50 is detected by a temperature sensor 66 and maintained at a predetermined temperature.

[0087] The web W dried in the drying section 15 is peeled from the belt 48 by the peeling section 55 and sent to the cutting section 4. The strip-shaped web W sent to the cutting section 4 is cut into a predetermined sheet size by a cutting blade to complete the cut product 7. At this time, the slitter cuts both widthwise end portions E of the strip-shaped web W along the longitudinal direction. The cutter cuts the web W along the width direction H by moving the upper straight blade up and down relative to the lower straight blade. The scraps of the cut product 7 cut by the cutting blade are collected in a scrap collection box. The scraps in the scrap collection box are returned to the recycled pulp manufacturing section 1 as shown in Figure 1 and are used again as waste paper raw material to manufacture the cut product 7.

[0088] As described above, the web smoothing device includes a belt 48 that transports the web W, a rotor 50 that rotates while clamping the web W transported by the belt 48 between itself and the belt 48 on its circumferential surface, a heating section 62 that is provided on the rotor 50 and that heats the web W, a separation section 71 that separates the belt 48 from the web W within a predetermined range on the circumferential surface, and a pressure roller 75 that presses the web W against the circumferential surface with a predetermined pressure in the separation section 71. Therefore, the web W can be easily smoothed by pressing the web W with the pressure roller 75. Furthermore, the simple configuration allows the area occupied by the device to be small.

[0089] Furthermore, the pressure roller 75 extends along the width direction H perpendicular to the longitudinal direction of the web W, and the length Lr in the width direction H of the pressure portion 85 of the pressure roller 75 that presses the web W is formed to be shorter than the length Lw in the width direction H of the web W, so that the pressure portion 85 does not press the both side end portions E in the width direction H of the web W. This prevents the both side end portions E in the width direction H of the web W from sticking to the rotating body 50 and making peeling difficult.

[0090] The pressure roller 75 extends along a width direction H perpendicular to the longitudinal direction of the web W, and the length Lr of the pressure roller 75 in the width direction H is longer than the length Ls of the width direction H of the cut material 7 produced by cutting and removing both end portions E of the web W in the width direction H along the longitudinal direction in the cutting section 4 installed downstream of the rotating body 50.Therefore, the smoothness of the cut material 7 obtained by cutting is maintained, resulting in a beautiful finish.

[0091] Furthermore, the belt 48 is provided with an attachment section 67, which is located a predetermined distance upstream of the separation section 71 in the conveying direction of the web W and attaches the leading end portion G of the web W to the circumferential surface. Therefore, even if the belt 48 separates from the web W at the separation section 71, the attachment section 67 can reliably attach the leading end portion G of the web W to the circumferential surface of the rotating body 50, and the pressing roller 75 can press and smooth the web W.

[0092] Furthermore, the attachment portion 67 is provided on one roller 49 over which the belt 48 is passed, and the roller 49 is arranged opposite the peripheral surface, and a gap M is formed between the belt 48 passed over the roller 49 and the peripheral surface, and the size of the gap M is greater than the thickness of the portion K following the tip portion T of the web W, so that the tip portion G of the web W can be more reliably attached to the peripheral surface and the formation of unevenness of the belt 48 in the subsequent portion K of the web W can be suppressed.

[0093] Furthermore, since the detecting section 76 for detecting abnormal transport of the web W is provided, the abnormal transport of the web W can be detected by the detecting section 76.

[0094] Furthermore, when the detection unit 76 detects a transport failure due to a jam of the web W on the circumferential surface, the detection unit 76 is provided with a jam control unit 91 that controls the operation of the rotating body 50 to rotate the rotating body 50 in the reverse direction, so that the jam can be properly dealt with by transporting the leading end portion G of the web W in the reverse direction upstream.

[0095] Furthermore, an adjustment unit 77 is provided to adjust the pressing force of the pressure roller 75 on the web W, and a pressure control unit 92 is provided to control the adjustment unit 77 based on the detection results of the detection unit 76, so that the pressing force can be adjusted when abnormal transport of the web W occurs due to the pressure of the pressure roller 75.

[0096] Furthermore, when the detection unit 76 detects that the portion of the web W subsequent to the leading end portion G has moved away from the peripheral surface upstream of the pressure roller 75 by more than a predetermined distance, the pressure control unit 92 controls the pressure roller 75 to weaken its pressure, thereby automatically resolving any poor transport of the web W.

[0097] Furthermore, since the web W contains a predetermined amount of moisture, by pressing the web W containing moisture with the pressure roller 75, the smoothness of the web W can be easily improved.

[0098] Furthermore, the papermaking apparatus Q is equipped with a smoothing device Q for the web W, which makes it possible to improve the smoothness of the paper obtained by papermaking.

[0099] In the above embodiments, the waste paper recycling processing device 100 is provided with a deinking unit 2, but the deinking unit 2 may be omitted. Also, the pressure roller 75 extends along the width direction perpendicular to the longitudinal direction of the web W, but it may extend in a direction intersecting the longitudinal direction. Also, the length Lr in the width direction H of the pressure portion 83 of the pressure roller 75 that presses the web W is formed to be shorter than the length Lw of the web W in the width direction H, but it may be the same length as the web or longer than the web.

[0100] Furthermore, the length Lr of the pressure roller 75 in the width direction H is longer than the length Ls of the cut material 7 produced by cutting and removing both end portions E of the web W in the width direction H along the longitudinal direction in the cutting unit 4 installed downstream of the rotor 50, but it may be the same as or shorter than the width direction length of the cut material. Also, an attachment unit 67 is provided, which is installed a predetermined distance upstream of the separating unit 71 in the conveying direction of the web W and attaches the leading end portion G of the web W to the circumferential surface of the rotor 50, but an attachment unit need not be provided. If an attachment unit is not provided, providing the separating unit above the rotor can prevent the web from separating from the rotor even when the belt separates from the rotor.

[0101] Furthermore, although the attachment portion 67 is provided on the support roller 611, which is a single roller around which the belt 48 is wound, an attachment portion may be provided separately from the roller. Furthermore, although a gap M is formed between the belt 48 wound around the support roller 611 and the circumferential surface of the rotating body 50, this gap need not be present. Furthermore, although the size of the gap M is formed to be larger than the thickness of the trailing portion of the web W than the leading end portion, it may be the same as or larger than the thickness of the trailing portion of the web.

[0102] Furthermore, although a detection unit 76 is provided to detect abnormal transport of the web W, a detection unit need not be provided. The detection unit is configured with a transmission sensor, but a camera may also be used, and abnormal transport of the web may be detected based on the amount of rotation of the pressure roller. Furthermore, the control unit is provided with a jam control unit 91 that controls the operation of the rotating body 50 to rotate the rotating body 50 in the reverse direction when the detection unit 76 detects a transport problem due to a jam of the web W on the circumferential surface of the rotating body 50, but the rotation of the rotating body may be stopped or may be rotated in the forward direction instead of reversed, depending on the state of the web.

[0103] Furthermore, although an adjustment unit 77 is provided for adjusting the pressing force of the pressure roller 75 on the web W, the adjustment unit 77 may be omitted. Furthermore, the control unit 9 is provided with a pressing control unit 92 that controls the pressure of the pressure roller 75 to weaken when the detection unit 76 detects that the portion of the web W subsequent to the leading end has separated from the circumferential surface of the rotating body by more than a predetermined distance upstream of the pressure roller 75. However, the control may also be such that the pressing force of the pressure roller is weakened after a predetermined time has elapsed since the start of web transport. Furthermore, although the pressing force is weakened in stages, the timing for weakening the pressing force may be varied in accordance with the state of the web, and the amount by which the pressing force is weakened may also be varied.

[0104] The web W may contain a predetermined amount of moisture, or may be a layer of fibers containing little or no moisture. Also, the web smoothing device is provided in the drying section of the papermaking machine, but it may also be provided in the web forming section, downstream of the cutting section, or in another device, such as a compressed fiber manufacturing device. [Explanation of symbols]

[0105] H width direction, M gap, Q papermaking device, W web, 4 cutting section, 7 cut material, 48 belt, 50 rotating body, 62 heating section, 67 adhesion section, 71 separation section, 75 pressure roller, 76 detection section, 77 adjustment section, 85 pressure section, 91 jam control section, 92 pressure control section.

Claims

1. a belt for conveying the web; a rotating body that rotates while sandwiching the web conveyed by the belt between itself and the belt and its peripheral surface; a heating section provided on the rotating body for heating the web; a spacing portion that spaces the belt from the web within a predetermined range of the circumferential surface; a pressure roller that presses the web against the peripheral surface at a predetermined pressure in the spaced apart portion, The pressure roller extends along a width direction of the web that is perpendicular to the longitudinal direction of the web, A web smoothing device, wherein the length in the width direction of the pressing portion of the pressing roller that presses the web is formed shorter than the length in the width direction of the web.

2. A belt for conveying a web, a rotating body that rotates while sandwiching the web conveyed by the belt between itself and the belt and its peripheral surface; a heating section provided on the rotating body for heating the web; a spacing portion that spaces the belt from the web within a predetermined range of the circumferential surface; a pressure roller that presses the web against the peripheral surface at a predetermined pressure in the spaced apart portion, The pressure roller extends along a width direction of the web that is perpendicular to the longitudinal direction of the web, A web smoothing device in which the widthwise length of the pressure roller is formed to be longer than the widthwise length of the cut material produced by cutting and removing both widthwise end portions of the web along the longitudinal direction in a cutting section installed downstream of the rotating body.

3. The pressure roller extends along a width direction of the web that is perpendicular to the longitudinal direction of the web, 2. A web smoothing device as described in claim 1, wherein the widthwise length of the pressure roller is formed longer than the widthwise length of a cut product produced by cutting and removing both widthwise end portions of the web along the longitudinal direction in a cutting section installed downstream of the rotating body.

4. A belt for conveying a web, a rotating body that rotates while sandwiching the web conveyed by the belt between itself and the belt and its peripheral surface; a heating section provided on the rotating body for heating the web; a spacing portion that spaces the belt from the web within a predetermined range of the circumferential surface; a pressure roller that presses the web against the peripheral surface at a predetermined pressure in the spaced apart portion, a web smoothing device provided with an attachment section that is installed at a position a predetermined distance upstream of the separation section in the web transport direction and that attaches the leading end portion of the web to the peripheral surface;

5. A web smoothing device as described in any one of claims 1 to 3, which is provided with an attachment section that is installed at a position a predetermined distance upstream of the separation section in the web conveying direction and that attaches the leading end portion of the web to the peripheral surface.

6. the attachment portion is provided on one roller over which the belt is wound, The roller is disposed opposite the peripheral surface, a gap is formed between the belt wrapped around the roller and the peripheral surface; 6. A web smoothing device according to claim 4 or claim 5, wherein the size of the gap is greater than the thickness of the trailing portion of the web compared to the thickness of the leading portion of the web.

7. 7. The web smoothing device according to claim 1, further comprising a detection unit that detects abnormal transport of the web.

8. A belt for conveying a web, a rotating body that rotates while sandwiching the web conveyed by the belt between itself and the belt and its peripheral surface; a heating section provided on the rotating body for heating the web; a spacing portion that spaces the belt from the web within a predetermined range of the circumferential surface; a pressure roller that presses the web against the peripheral surface at a predetermined pressure in the spaced apart portion, a detection unit that detects abnormal transport of the web; a jam control unit that controls the operation of the rotating body to rotate the rotating body in a reverse direction when the detection unit detects a transport failure due to a jam of the web on the circumferential surface; Web smoothing device.

9. The web smoothing device according to claim 7, further comprising a jam control unit that controls the operation of the rotating body to rotate the rotating body in the reverse direction when the detection unit detects a transport failure due to a jam of the web on the circumferential surface.

10. A belt for transporting a web, The web conveyed by the belt is rotated while being sandwiched between the belt and the peripheral surface. a rotating body, a heating section provided on the rotating body for heating the web; a spacing portion that spaces the belt from the web within a predetermined range of the circumferential surface; a pressure roller that presses the web against the peripheral surface at a predetermined pressure in the spaced apart portion, a detection unit that detects abnormal transport of the web; an adjusting unit that adjusts the pressing force of the pressing roller on the web, a pressure control unit that controls the adjustment unit based on the detection result of the detection unit; Web smoothing device.

11. an adjusting unit that adjusts the pressing force of the pressing roller on the web, 10. The web smoothing device according to claim 7, further comprising a pressure control section that controls the adjustment section based on the detection result of the detection section.

12. The web smoothing device according to claim 10 or claim 11, wherein the pressure control unit controls the pressure roller to weaken the pressure when the detection unit detects that the portion of the web following the leading end portion has moved away from the peripheral surface upstream of the pressure roller by more than a predetermined value.

13. 13. The web smoothing device according to claim 1, wherein the web contains a predetermined moisture content.

14. A papermaking machine comprising the web smoothing device according to any one of claims 1 to 13.

Images