JP2012036525A - Wet paper drying apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wet paper drying apparatus that can be downsized and prevent abnormal sound and abrasion.SOLUTION: There is provided a wet paper drying apparatus 6 that dries wet paper 39 while the wet paper 39 is conveyed by a conveyance belt 44. The conveyance belt 44 is freely rotatable along an endless track with being wound around an outer peripheral surface of a drying drum 46 that has a cylindrical shape and is freely rotatable and a freely rotatable roller. The drying drum 46 includes a flexible sheet-like heating device 71 for heating the drying drum 46 and energization means 72 for pressing the heating device 71 against the inner peripheral surface of the drying drum 46.

Description

  The present invention relates to a wet paper dryer for drying wet paper obtained in a paper making process.

  Some used paper processing apparatuses for producing recycled paper from used paper include a wet paper drying device. As shown in FIG. 11, the wet paper web drying apparatus is provided with a rectangular flat plate-like heater plate 110 in the horizontal traveling path portion 109 of the smooth surface endless belt 108, and the heater plate 110 is in sliding contact with the lower surface of the smooth surface endless belt 108. ing.

  As the smooth surface endless belt 108 travels in one direction, the wet paper web 111 is conveyed on the heater plate 110 while being held on the upper surface of the smooth surface endless belt 108. At this time, heat generated from the heater plate 110 is transmitted to the smooth surface endless belt 108, and the wet paper web 111 is dried by this heat.

  The wet paper drying device provided in the used paper processing apparatus as described above is described in, for example, Patent Document 1 below.

JP2007-23450

  However, in the above-described conventional format, the wet paper web 111 is dried using the rectangular flat heater plate 110, so that the wet paper web drying device is enlarged in the longitudinal direction of the heater plate 110.

  In addition, the smooth surface endless belt 108 moves in the horizontal travel path portion 109 while being in sliding contact with the heater plate 110 fixed in order to improve heat conduction, and thus a problem that abnormal noise occurs due to friction, There is a problem that the smooth surface endless belt 108 or the heater plate 110 wears in a short period of time.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a wet paper web drying apparatus that can be miniaturized and can prevent generation of abnormal noise and wear.

In order to achieve the above object, the first invention is a wet paper drying device that dries while transporting wet paper with a transport belt,
The conveyor belt is wound around an outer peripheral surface of a rotatable cylindrical drying drum and a rotatable roller, and can rotate on an endless track.
The conveyor belt can hold wet paper on the surface opposite to the surface in contact with the drying drum and roller,
In the drying drum, a flexible sheet-like heating device for heating the drying drum, and an urging means for pressing the heating device against the inner peripheral surface of the drying drum are provided.

  According to this, the drying drum and the roller rotate and the conveyor belt rotates on the endless track, and the wet paper web is held and conveyed by the conveyor belt. At this time, the drying drum is heated by the heat generated from the heating device, and this heat is transmitted from the drying drum to the wet paper via the transport belt, and the wet paper is heated and dried. Since the wet paper is dried using the cylindrical drying drum heated in this manner, the wet paper dryer is downsized.

  Further, since the conveying belt rotates and the drying drum rotates, the conveying belt does not come into sliding contact with the drying drum. Therefore, generation of noise due to friction can be prevented, and the conveying belt or the drying drum can be prevented. It is possible to prevent the use drum from being worn in a short period of time.

  Further, since the conveyor belt is wound around the drying drum, the conveyor belt easily comes into surface contact with the outer periphery of the drying drum, and heat is efficiently transferred from the drying drum to the conveyor belt. It can be dried efficiently.

  In addition, since the heating device is pressed against the inner peripheral surface of the drying drum by the urging means, the drying drum is efficiently heated by the heat of the heating device, and the heat of the heating device escapes to a part other than the drying drum. Can be reduced.

In the wet paper web drying apparatus according to the second aspect of the present invention, the width of the heating device in the axial direction of the drying drum is equal to or larger than the width of the wet paper in the axial direction of the drying drum.
According to this, the wet paper web can be heated and dried almost uniformly by the heated drying drum.

In the wet paper drying apparatus according to the third aspect of the invention, the urging means presses the heating device against the inner peripheral surface of the drying drum by an elastic force.
In the wet paper web drying apparatus according to the fourth invention, the biasing means is a thin plate member that is elastically deformable.

In the wet paper web drying apparatus according to the fifth aspect of the present invention, the heating device has first heat generation regions at both ends in the axial direction of the drying drum, and is disposed between both first heat generation regions in the axial direction of the drying drum. Has two heat generating areas,
The heat generation amount in the first heat generation area is larger than the heat generation amount in the second heat generation area.

  According to this, since both ends in the axial direction of the drying drum are in contact with outside air, more heat transferred from the heating device to the drying drum escapes from both ends of the drying drum, and the drying drum There is a concern that both ends become colder than the center, and it becomes difficult to dry the wet paper uniformly.

  As a countermeasure against this, by making the heat generation amount of the first heat generation area larger than the heat generation amount of the second heat generation area as described above, the temperature difference between the both end portions and the center portion in the axial direction of the drying drum is greatly increased. The wet paper can be uniformly heated and dried.

In the sixth aspect of the present invention, the wet paper web drying apparatus has a heating device provided with a heating wire inside an elastically deformable sheet-like elastic member,
The wiring density of the heating wire in the first heating region is higher than the wiring density of the heating wire in the second heating region.

  According to this, the amount of heat generated in the first heat generating region is larger than the amount of heat generated in the second heat generating region, so that the temperature difference between the both ends and the central portion in the axial direction of the drying drum is greatly reduced, and the wet paper web Can be heated and dried uniformly.

In the wet paper web drying apparatus according to the seventh aspect of the invention, the drying drum is rotatably supported by a plurality of support wheels that contact the outer peripheral surface.
The heating device generates heat by electric power, and is electrically connected to an external power supply unit via a slip ring device.

  According to this, electric power from the power feeding unit is supplied to the heating device via the slip ring device, and heat is generated from the heating device.

  As described above, according to the present invention, it is possible to reduce the size of the wet paper drying apparatus, to prevent the generation of noise due to friction, and to prevent the conveyor belt or the drying drum from being worn in a short period of time. it can.

  Further, the drying drum is efficiently heated by the heat of the heating device, and it is possible to reduce the waste of the heat of the heating device that escapes to a portion other than the drying drum.

It is the schematic which shows the structure of the upstream part of the used paper reproduction | regeneration processing apparatus provided with the wet paper drying apparatus in the 1st Embodiment of this invention. It is the schematic which shows the structure of the downstream part of a used paper reproduction | regeneration processing apparatus provided with the wet paper drying apparatus similarly. FIG. 3 is a perspective view of a drying drum of the wet paper dryer. 2 is a plan view of a drying drum of the wet paper web drying apparatus. FIG. It is a XX arrow line view in FIG. It is a partially cutaway side view of the drying drum of the wet paper dryer. It is a partial expanded sectional view of the drum for drying of a wet paper dryer. It is an expanded view of the rubber heater of the wet paper dryer. FIG. 3 is a perspective view of a thin plate member of the wet paper dryer. It is a side view of the wet paper web drying apparatus and the wet paper web dehydrating apparatus in the second embodiment of the present invention. It is a figure of the conventional wet paper drying apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
First, a first embodiment of the present invention will be described. 1 and 2 are schematic views showing the configuration of a used paper recycling processing apparatus 1. The used paper recycling processing apparatus 1 includes a used paper pulp manufacturing device 2, a deinking device 3, a paper making device 4, and a wet paper dewatering device 5. And a wet paper web drying device 6 and a finishing device 7.

  As shown in FIG. 1, the used paper pulp manufacturing apparatus 2 includes a pulper device 14 that disaggregates a paper material 12 obtained by shredding used used paper 11 to produce a pulp-containing liquid 13, and a pulper device 14. A measuring unit 15 that measures the input amount of the input paper material 12 and a paper material supply device 16 that supplies the paper material 12 to the measuring unit 15 are provided.

  The paper material supply device 16 includes a paper shredding machine 17 that shreds the waste paper 11, a storage unit 18 that stores the paper material 12 that shreds the waste paper 11, and the paper material 12 in the storage unit 18 into the weighing unit 15. A discharging cyclone 19 to be discharged, a paper material conveying duct 20 for conveying the paper material 12 in the storage unit 18 to the discharging cyclone 19, and a sending device 21 for sending the paper material 12 in the storing unit 18 to the paper material conveying duct 20 A dispersing cyclone 22 that disperses the fed paper material 12, a blower 24 that generates an air flow 23 that flows from the dispersing cyclone 22 through the paper material transport duct 20 to the discharging cyclone 19, and a discharging device. An air supply return duct 25 that returns the airflow 23 that has flowed into the cyclone 19 to the suction side of the blower 24 is provided.

  The paper material transport duct 20 has a curved portion 20a that curves upward, and a vibration generator 26 (vibrator or the like) that applies vibration to the paper material transport duct 20 is provided in the curved portion 20a.

  The pulper device 14 includes a pulper tank 27 and a stirring device 28 provided in the pulper tank 27. The paper material 12 put into the pulper tank 27 from the measuring unit 15 is mixed and stirred with water and a disaggregation accelerator, and thereby a pulp-containing liquid 13 is obtained.

  The pulp-containing liquid 13 is stored in the storage tank 29 and then deinked by the deinking device 3. The deinking device 3 includes a deinking tank 31 and a bubble generating device (not shown) that generates bubbles from the bottom of the deinking tank 31, and print components from the pulp-containing liquid 13 by generating bubbles. Isolate.

  As shown in FIG. 2, the paper making apparatus 4 includes a rotatable paper making wire 36 that is wound around a plurality of rollers 35 and formed of a mesh belt, and the deinked pulp-containing liquid 13 on the paper making wire 36. And a head box 37 to be supplied. By supplying the pulp-containing liquid 13 from the head box 37 onto the rotating papermaking wire 36, the pulp-containing liquid 13 is made and dehydrated, and a wet paper 39 forming a fiber layer is produced on the papermaking wire 36. (Generated). Any one of the plurality of rollers 35 is forcibly rotated by a driving device such as a motor.

  The wet paper web dewatering device 5 includes a plurality of freely rotatable rollers 40a to 40d and a water absorbing belt 41 wound around the rollers 40a to 40d. Is transferred to the water absorption belt 41, and the water absorption belt 41 absorbs the moisture of the wet paper 39 and dehydrates it. The water absorption belt 41 is a belt made of felt, and any one of the plurality of rollers 40a to 40d is forcibly rotated by a driving device such as a motor.

  The wet paper web drying device 6 dries the wet paper web 39 with the drying drum 46 while transporting the wet paper web 39 sandwiched between the first and second transport belts 44 and 45. The detailed structure of the wet paper web drying device 6 will be described below.

  The first conveying belt 44 is a metal belt, and is wound around the outer peripheral surface of the rotatable drying drum 46 and the plurality of rotatable first rollers 47a and 47b, and rotates around an endless track. It is free to move. The first conveyor belt 44 can hold the wet paper 39 on the surface opposite to the surface in contact with the drying drum 46 and the first rollers 47a and 47b. One of the rollers 47a and 47b is forcibly rotated by a driving device such as a motor.

  The second conveying belt 45 is a net-like resin belt, and is wound around a plurality of rotatable second rollers 50a to 50j so as to be rotatable on an endless track. The second conveyor belt 45 can hold the wet paper 39 on the surface opposite to the surface in contact with the second rollers 50a to 50g, 50j. Any one of the plurality of rollers 50a to 50j is forcibly rotated by a driving device such as a motor.

  The endless tracks of the first and second transfer belts 44 and 45 are linear lower and upper transfer track portions 53 and 54, and a reverse track portion 55 that reverses from the lower transfer track portion 53 to the upper transfer track portion 54. And have. The second transport belt 45 overlaps the first transport belt 44 from the outside in the lower and upper transport track portions 53 and 54 and the reverse track portion 55. The reversing track portion 55 is formed in a semicircular arc shape by the drying drum 46.

  Further, the water absorption belt 41 and the first transport belt 44 are sandwiched and overlapped in the vertical direction between the upper roller 40a of the wet paper web dehydrating device 5 and the first roller 47a of the lower web paper drying device 6. These two rollers 40a and 47a constitute a pressing and dehydrating part.

  A press roller 58 is provided between the second rollers 50g and 50j disposed on the reverse track portion 55 so as to freely rotate the wet paper web 39 between the first conveyance belt 44 on the reverse track portion 55. It has been. The press roller 58 constitutes a calendar portion.

  As shown in FIGS. 3 to 5, the drying drum 46 is made of a metal such as aluminum, and has a cylindrical drum body 60 and a pair of disk-shaped side covers that closes both side end openings of the drum body 60. 61 and a rotating shaft 62 provided on one of the side covers 61 and rotating integrally with the drying drum 46.

  The drying drum 46 is rotatably supported by a plurality of support rollers 63a and 63b (an example of a support ring) that are in contact with both axial ends of the outer peripheral surface of the drum body 60. Among these, as shown in FIG. 6, one support roller 63 a is rotatably disposed at the lower portion and one at the upper portion, and is in contact with one end portion of the outer peripheral surface of the drum main body 60. The other support roller 63 b is rotatably disposed at the lower part and two at the upper part, and is in contact with the other end of the outer peripheral surface of the drum body 60. One support roller 63 a and the other support roller 63 b that face each other in the axial direction F of the drying drum 46 are connected by a connecting shaft 65 that is parallel to the axial center 64 of the drying drum 46.

  As shown in FIGS. 4 and 6, the movement of the drying drum 46 in the axial direction F is regulated by a pair of rotatable positioning rollers 67 (an example of a positioning wheel). One positioning roller 67 is in contact with one end surface of the drum main body 60 in the axial direction F, and the other positioning roller 67 is in contact with the other end surface of the drum main body 60 in the axial direction. Each of the support rollers 63a and 63b and the positioning roller 67 is provided on a fixed frame (not shown) or the like. Further, although the positioning roller 67 is used as an example of the positioning wheel, a bearing or the like may be used instead of the positioning roller 67.

  Further, above the drying drum 46, a pair of bearings 68 (floating) for preventing the drying drum 46 from rising by contacting both ends of the outer peripheral surface of the drum body 60 in the axial direction F from above. An example of a prevention ring body is provided.

  As shown in FIGS. 6 and 7, in the drum main body 60, a flexible sheet-like rubber heater 71 (an example of a heating device) that heats the drying drum 46 from the inside, and the rubber heater 71 is a drum. A thin plate member 72 (an example of an urging unit) that is pressed against the inner peripheral surface of the main body 60 is provided. The rubber heater 71 and the thin plate member 72 are located between the side covers 61 of the drying drum 46.

  As shown in FIG. 8, the rubber heater 71 includes a rubber sheet 73 (an example of an elastic member) that can be elastically deformed, and a heating wire 74 (a heating element) provided inside the rubber sheet 73. It is bent into a cylindrical shape and inserted into the drum body 60, and is in surface contact with the inner peripheral surface of the drum body 60.

  The rubber sheet 73 in the present embodiment is made of silicone rubber having excellent heat resistance and electrical insulation and good thermal conductivity, and has a heat resistance temperature of about 200 ° C.

  As shown in FIGS. 7 and 9, the thin plate member 72 is an elastically deformable stainless steel thin plate that presses the rubber heater 71 against the inner peripheral surface of the drum body 60 by an elastic force, and is bent into a cylindrical shape. Then, it is inserted into the drum main body 60 and is in surface contact with the inner peripheral surface of the rubber heater 71. Note that both end portions 72 a and 72 b in the circumferential direction of the thin plate member 72 overlap in the radial direction of the drum body 60.

  As shown in FIGS. 4 and 8, the width W1 of the rubber heater 71 in the axial direction F of the drying drum 46 is set slightly larger than the width W2 of the wet paper 39 in the axial direction F. As shown in FIG. 8, the rubber heater 71 has first heat generation regions 76 at both ends in the axial direction F, and has a second heat generation region 77 between the first heat generation regions 76. The wiring density of the heating wires 74 in the first heat generation region 76 is higher than the wiring density of the heating wires 74 in the second heat generation region 77, so that the amount of heat generated in the first heat generation region 76 is the second heat generation region 77. It is set to be larger than the calorific value.

  As shown in FIG. 9, the width W 3 of the thin plate member 72 in the axial direction F is the same as the width W 1 of the rubber heater 71. The width W3 of the thin plate member 72 may be slightly narrower or wider than the width W1 of the rubber heater 71.

  As shown in FIGS. 6 and 7, a temperature detection sensor 79 (an example of a temperature detection device) that detects the temperature of the drum body 60 and a thermostat that prevents abnormal overheating of the drum body 60 are provided in the drum body 60. 80.

  The temperature detection sensor 79 and the thermostat 80 are attached to the attachment member 81, and are located at the center portion in the axial direction F of the drum body 60. A plurality of countersunk screws 82 are inserted and screwed into the drum body 60, the rubber heater 71, both ends 72a, 72b of the thin plate member 72, and the mounting member 81, whereby both ends of the mounting member 81 and the thin plate member 72 are engaged. 72a, 72b and the rubber heater 71 are integrally attached to the drum body 60. The detection portion of the temperature detection sensor 79 is inserted into a through hole 83 formed in the rubber heater 71 and the thin plate member 72 and is in contact with the inner peripheral surface of the drum main body 60. The thermostat 80 is in contact with the inner peripheral surface of the thin plate member 72. Thereby, the temperature detection sensor 79 and the thermostat 80 can rotate integrally with the drying drum 46.

  As shown in FIG. 5, the rubber heater 71, the temperature detection sensor 79, and the thermostat 80 are electrically connected to an external power supply unit 86 via a slip ring device 85. The slip ring device 85 includes a current collecting ring 87 provided on the rotating shaft 62 of the drying drum 46, a fixed case 88 (an example of a fixing member) provided outside the current collecting ring 87, and a fixed case 88. A plurality of brushes 89 and terminals 90 are provided.

  A hole 91 for wiring is formed in the rotating shaft 62, and a plurality of lead wires 92, one end of which is connected to the rubber heater 71, the temperature detecting sensor 79, and the thermostat 80, are inserted into the hole 91 of the rotating shaft 62, respectively. The other end of the lead wire 92 is connected to the current collecting ring 87. Each brush 89 is electrically connected to each terminal 90, and the tip of each brush 89 is slidably contactable with the current collecting ring 87. The power feeding unit 86 is electrically connected to each terminal 90. The fixed case 88 is attached to a fixed frame 93 provided on one side of the drying drum 46, and the current collecting ring 87 is accommodated in the fixed case 88. The rotary shaft 62 and the lead wire 92 are inserted into the fixed case 88 through a hole 93 a formed in the fixed frame 93.

As shown in FIG. 2, the finishing device 7 includes a cutter 95 that cuts recycled paper 94 manufactured by drying the wet paper 39 with the wet paper drying device 6 into a predetermined size.
Hereinafter, the operation of the above configuration will be described.

  As shown in FIG. 1, the used waste paper 11 is shredded by a paper shredder 17 to become a paper material 12, and the paper material 12 is stored in a storage unit 18. Due to the operation of the air blower 24, the air flow 23 flowing out from the discharge side of the air blower 24 flows into the discharge cyclone 19 from the dispersion cyclone 22 through the paper material transport duct 20, and then discharged. It is discharged from the cyclone 19 and flows in the air return duct 25 and returns to the suction side of the blower 24. As a result, a circulation path is formed in which the air flow 23 flows from the discharge side of the blower 24 through the paper material transport duct 20 and the air return duct 25 and returns to the suction side, and flows out from the discharge side again.

  In this state, by operating the delivery device 21, the paper material 12 in the storage unit 18 is sent out to the dispersion cyclone 22, dispersed in the dispersion cyclone 22, and conveyed by the air flow 23 to carry the paper material. It passes through the duct 20 and is discharged from the discharge cyclone 19 to the measuring unit 15.

  At this time, it is possible to prevent the paper material 12 from being clogged in the curved portion 20 a by operating the vibration generating device 26 and applying vibration to the curved portion 20 a of the paper material transport duct 20.

  When a predetermined amount of the paper material 12 is weighed in the measuring unit 15, the predetermined amount of the paper material 12 is put into the pulper tank 27 of the pulper device 14 from the measuring unit 15 and stirred with water and the disaggregation accelerator. . Thereby, the paper material 12 is disaggregated in the pulper tank 27, and the pulp containing liquid 13 is manufactured. The pulp-containing liquid 13 is stored in the storage tank 29, deinked by the deinking device 3, and then supplied into the head box 37 of the papermaking device 4 as shown in FIG.

  The pulp-containing liquid 13 in the head box 37 is supplied onto the paper-making wire 36 rotating in one direction B, and papermaking is performed, whereby the pulp-containing liquid 13 is dehydrated and the wet paper 39 is manufactured. The wet paper 39 obtained in this manner is transferred from the upper surface of the paper making wire 36 to the water absorbing belt 41 rotating in one direction C, and is absorbed and dehydrated by the water absorbing belt 41 while rotating together with the water absorbing belt 41. The

The wet paper 39 dehydrated in the wet paper dewatering device 5 in this way is then dried in the wet paper drying device 6. The operation of the wet paper web drying device 6 will be described below.
By forcibly rotating one of the rollers 47a and 47b by the driving device, the first conveying belt 44 is rotated in one direction D, and any of the rollers 50a to 50j is forcibly rotated by the driving device. Thus, the second conveyor belt 45 is rotated in one direction E.

  By the rotation of the first conveying belt 44, the drying drum 46 rotates while being supported by the support rollers 63a and 63b, as shown in FIG. At this time, as shown in FIG. 4, the movement of the drying drum 46 in the axial direction F is restricted by the positioning roller 67, and the lifting of the drying drum 46 is lifted by the bearing 68 as shown in FIG. 3. Is prevented.

  As shown in FIG. 5, the rotating shaft 62 rotates integrally with the drying drum 46, the current collecting ring 87 rotates together with the rotating shaft 62, and the tips of the brushes 89 are in sliding contact with the current collecting ring 87. As a result, the rubber heater 71, the temperature detection sensor 79, and the thermostat 80 are electrically connected to the external power supply unit 86 via the slip ring device 85, and the electric power from the power supply unit 86 is supplied to each brush 89 and the current collecting ring 87. And the lead wire 92 to be supplied to the rubber heater 71, the temperature detection sensor 79 and the thermostat 80, and the drying drum 46 is heated by the heat generated from the rubber heater 71, and the temperature detection sensor 79 and the thermostat 80 Temperature control is performed.

  Thus, since the rubber heater 71, the temperature detection sensor 79, and the thermostat 80 are connected to the external power supply unit 86 via the slip ring device 85, each lead wire 92 is accompanied with the rotation of the drying drum 46. Can be prevented from being twisted and disconnected. Further, since the drying drum 46 is rotatably supported by the plurality of support rollers 63a and 63b, the slip ring device 85 is positioned at a position coincident with the rotation shaft 62 of the drying drum 46, that is, the drying drum 46. It can be easily arranged at a position on the axis 64.

  As shown in FIG. 2, the wet paper 39 is transferred from the water absorption belt 41 to the first conveyance belt 44 and then conveyed while being held between the first conveyance belt 44 and the second conveyance belt 45. The At this time, the heat of the drying drum 46 is transmitted to the wet paper 39 through the first conveying belt 44, and the wet paper 39 is heated and dried. Since the wet paper 39 is dried using the cylindrical drying drum 46 heated in this way, the wet paper drying device 6 is downsized.

  Further, since the first conveying belt 44 rotates and the drying drum 46 rotates, the first conveying belt 44 does not slide in contact with the drying drum 46, and therefore, generation of abnormal noise due to friction is prevented. In addition, the first conveying belt 44 or the drying drum 46 can be prevented from being worn in a short period of time.

  Further, since the rubber heater 71 is pressed against the inner peripheral surface of the drum main body 60 by the thin plate member 72 and is in contact with the entire surface, the drying drum 46 is efficiently heated by the heat of the rubber heater 71. It is possible to reduce the heat that escapes to the portions other than the drying drum 46 and is wasted.

  Further, since both ends of the drying drum 46 in the axial direction F are in contact with outside air, more heat transferred from the rubber heater 71 to the drying drum 46 escapes from both ends of the drying drum 46. Tend. On the other hand, as shown in FIG. 8, the wiring density of the heating wire 74 in the first heating region 76 of the rubber heater 71 is higher than the wiring density of the heating wire 74 in the second heating region 77. The heat generation amount of the first heat generation region 76 is larger than the heat generation amount of the second heat generation region 77. As a result, even if more heat escapes from both ends of the drying drum 46 as described above, the temperature difference between the both ends and the center in the axial direction F of the drying drum 46 is greatly reduced, and the wet paper 39 Can be dried uniformly.

  Furthermore, as shown in FIG. 4, the width W1 of the rubber heater 71 is set slightly larger than the width W2 of the wet paper 39, so that the wet paper 39 can be heated and dried more uniformly.

  Further, as shown in FIG. 7, the temperature of the drum body 60 of the drying drum 46 is detected by a temperature detection sensor 79. At this time, since the detection part of the temperature detection sensor 79 is in contact with the inner peripheral surface of the drum main body 60, the temperature of the inner peripheral surface of the drum main body 60 can be accurately detected. Since the temperature difference between the peripheral surface and the outer peripheral surface is negligible, the temperature of the drum body 60 can be accurately detected. Further, since the temperature detection sensor 79 rotates integrally with the drum main body 60, it does not slide on the inner peripheral surface of the drum main body 60. Therefore, wear of the temperature detection sensor 79 and wear of the inner peripheral surface of the drum body 60 can be prevented, and cost reduction and durability can be improved.

  Based on the temperature detected by the temperature detection sensor 79 as described above, the power feeding unit 86 is controlled so that the temperature of the drum body 60 is maintained at the set temperature. In the unlikely event that the temperature detection sensor 79 breaks down and temperature detection becomes impossible and the temperature of the drum body 60 rises abnormally beyond the set temperature due to the heating of the rubber heater 71, an abnormality is caused by the thermostat 80. When overheating is detected, the thermostat 80 cuts off the power supply to the rubber heater 71 based on the detection of the abnormal overheating, so that the abnormal overheating of the drum body 60 can be immediately prevented, and safety is ensured.

  In this embodiment, the temperature detection sensor 79 is used to detect the temperature of the inner peripheral surface of the drum main body 60. However, if the temperature of the outer peripheral surface of the drum main body 60 is detected, it is fixed. A method of detecting the temperature by sliding the contact type temperature detection sensor on the outer peripheral surface of the rotating drum body 60 (hereinafter referred to as the first method), or using a rotary contact type or non-contact type temperature detection sensor A method for detecting the temperature (hereinafter referred to as the second method), a method for mounting the temperature detection sensor on the outer peripheral surface of the drum body 60 (hereinafter referred to as the third method), or the like can be considered. However, in the first method, the temperature detection sensor and the outer peripheral surface of the drum main body 60 may be worn. In the second method, when a rotational contact type or non-contact type temperature detection sensor is used, the cost may increase. Further, in the third method, the temperature detection sensor must be mounted at a position where it does not interfere with the first conveyor belt 44, that is, at the end in the axial direction F of the drum body 60. However, the temperature of the end portion in the axial direction F of the drum body 60 has a larger error than the temperature of the center portion, and it is difficult to accurately detect the temperature of the center portion of the drum body 60.

  By drying the wet paper 39 in the wet paper drying device 6 as described above, the recycled paper 94 is produced from the wet paper 39, and this recycled paper 94 is finished from the wet paper drying device 6 as shown in FIG. After being transported to the apparatus 7 and cut into a predetermined size by the cutter 95, it is discharged from the used paper recycling apparatus 1.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.
As shown in FIG. 10, the water absorption belt 41 is wound around a plurality of rollers 40 a to 40 d and a meandering correction roller 101, and is rotatable on an endless track. The meandering correction roller 101 corrects the meandering of the water absorbing belt 41 in the axial direction of the rollers 40a to 40d.

  The first conveyor belt 44 is wound around a drying drum 46 and a plurality of first rollers 47a to 47e, and can rotate on an endless track. The second conveyor belt 45 is wound around a plurality of second rollers 50a to 50h and is rotatable on an endless track.

  A part of the endless track of the first and second conveyor belts 44 and 45 is curved into an S shape by the drying drum 46 and the second roller 50h adjacent to the drying drum 46. A meandering track portion 104 that serpentines is formed. In the meandering track portion 104, the winding direction of the conveying belts 44 and 45 around the drying drum 46 and the winding direction around the second roller 50h are opposite to each other.

Hereinafter, the operation of the above configuration will be described.
The wet paper 39 is transferred from the water absorption belt 41 to the first conveyance belt 44, and then conveyed while being held between the first conveyance belt 44 and the second conveyance belt 45, and the heat of the drying drum 46 is transferred. Dried by. When the wet paper 39 passes through the meandering track portion 104, on the outer peripheral surface of the drying drum 46, the transport distance of one surface of the wet paper 39 that is in contact with the first transport belt 44 is the first of the wet paper 39. One surface of the outer surface of the second roller 50h that is in contact with the first conveyance belt 44 of the second roller 50h is shorter than the conveyance distance of the other surface that is in contact with the second conveyance belt 45. Is longer than the transport distance of the other surface of the wet paper 39 in contact with the second transport belt 45. In this way, the relationship between the lengths of the conveyance distances of the front and back surfaces of the wet paper 39 is reversed between the outer peripheral surface portion of the drying drum 46 and the outer peripheral surface portion of the second roller 50h. Separation from 44 and 45 is promoted. Thereby, the wet paper 39 after being dried in the wet paper drying device 6, that is, the recycled paper 94, is reliably peeled off from both the transport belts 44 and 45 and is transported to the finishing device 7.

  In each of the above embodiments, as shown in FIG. 4, the width W1 of the rubber heater 71 is set larger than the width W2 of the wet paper 39, but the width W1 of the rubber heater 71 is set to be equal to the width W2 of the wet paper 39. The same may be set.

  In each of the above embodiments, as shown in FIG. 3, the temperature detection sensor 79 and the thermostat 80 are provided in one place in the axial direction F of the drum body 60, but may be provided in a plurality of places. Moreover, although provided in one place in the circumferential direction of the drum body 60, it may be provided in a plurality of places.

  In each of the above embodiments, as shown in FIG. 8, only one rubber heater 71 is provided on the inner peripheral surface of the drying drum 46, but the rubber heater for the first heat generating region 76 and the second heat generating region 77 are provided. A plurality of rubber heaters are prepared, and the total of the width of the rubber heater for the first heat generation region 76 and the width of the rubber heater for the second heat generation region 77 is equal to or larger than the width W2 of the wet paper web 39. A rubber heater made of a sheet may be provided on the inner peripheral surface of the drying drum 46.

  In each of the above embodiments, the rubber heater 71 is used as an example of a flexible sheet-like heating device. However, the rubber heater 71 is excellent in heat resistance and electrical insulation, has good thermal conductivity, and has flexibility. It is not limited to a rubber heater as long as it has a sheet-like form.

  In each of the above embodiments, only one thin plate member 72 is used as an example of the urging means. However, a plurality of thin plate members 72 having a narrow width W3 are prepared, and these thin plate members 72 are arranged in the direction of the width W3. Also good.

  In the first embodiment, as shown in FIG. 2, the wet paper web dewatering device 5 has four rollers 40a to 40d, and the wet paper web drying device 6 has two first rollers 47a and 47b and 10 rollers. Although the second rollers 50a to 50j are provided, the number of each of these rollers is not limited to the above number, and may be appropriately increased or decreased depending on the size and performance of the apparatus. For example, the wet paper web dewatering device 5 may be provided with five rollers, or the wet paper web drying device 6 may be provided with three first rollers.

  Similarly, in the second embodiment, the number of the rollers is not limited to the number shown in FIG. 10 and may be appropriately increased or decreased depending on the size and performance of the apparatus.

6 Wet Paper Drying Device 39 Wet Paper 44 First Conveying Belt 46 Drying Drums 47a and 47b First Roller 62 Rotating Shafts 63a and 63b Support Rollers (Support Wheels)
71 Rubber heater (heating device)
72 Thin plate member (biasing means)
73 Rubber sheet (elastic member)
74 Heating wire 76 1st heat_generation | fever area | region 77 2nd heat_generation | fever area | region 85 Slip ring apparatus 86 Power supply part 87 Current collection ring 88 Fixed case (fixing member)
89 Brush F Axial direction W1 Rubber heater width W2 Wet paper width

Claims (7)

A wet paper drying device that dries while transporting wet paper with a transport belt,
The conveyor belt is wound around an outer peripheral surface of a rotatable cylindrical drying drum and a rotatable roller, and can rotate on an endless track.
The conveyor belt can hold wet paper on the surface opposite to the surface in contact with the drying drum and roller,
The drying drum is provided with a flexible sheet-like heating device for heating the drying drum, and urging means for pressing the heating device against the inner peripheral surface of the drying drum. Wet paper drying device. 2. The wet paper web drying apparatus according to claim 1, wherein the width of the heating device in the axial direction of the drying drum is equal to or larger than the width of the wet paper in the axial direction of the drying drum. 3. The wet paper web drying apparatus according to claim 1, wherein the urging means presses the heating device against the inner peripheral surface of the drying drum by an elastic force. The wet paper web drying apparatus according to any one of claims 1 to 3, wherein the urging means is a thin plate member that is elastically deformable. The heating device has a first heat generation area at both ends in the axial direction of the drying drum and a second heat generation area between both first heat generation areas in the axial direction of the drying drum,
The wet paper web drying apparatus according to any one of claims 1 to 4, wherein the heat generation amount of the first heat generation area is larger than the heat generation amount of the second heat generation area. The heating device is provided with a heating wire inside an elastically deformable sheet-like elastic member,
6. The wet paper web drying apparatus according to claim 5, wherein the wiring density of the heating wire in the first heating area is higher than the wiring density of the heating wire in the second heating area. The drying drum is rotatably supported by a plurality of support wheels contacting the outer peripheral surface,
7. The heating device according to claim 1, wherein the heating device generates heat by electric power, and is electrically connected to an external power supply unit via a slip ring device. 8. Wet paper drying equipment.

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