JP5868069B2 - Paper machine - Google Patents

Description

  The present invention relates to a paper machine such as a used paper recycling apparatus, and particularly relates to a wet paper drying technique.

  Conventionally, this type of technology includes, for example, one described in Patent Document 1. In this used paper processing apparatus, a peeling member is provided on the downstream side of the heating and drying unit in the smooth surface endless belt, the base end portion of the peeling member is supported on the fixed side, and the leading edge thereof is placed on the surface of the smooth surface endless belt. It is made to contact elastically. The dry paper dried on the smooth surface endless belt is sequentially peeled from the holding surface of the smooth surface endless belt by the leading edge of the peeling member.

  Moreover, what is described in Patent Document 2 is an endless belt-shaped cleaning device that removes deposits adhering to the surface of the endless strip, and a cleaning water jetting device that jets cleaning water to the surface of the endless strip, The adhering material suction device sucks the cleaning water ejected from the washing water jetting device onto the surface of the endless belt, and slides on the surface of the endless belt between the cleaning water jetting device and the sticking material suction device. A freely contacting sliding member is arranged, and this sliding member is reciprocally driven in the width direction of the endless strip to peel off the deposits attached to the surface of the endless strip.

JP2007-23450 JP2002-282803

  By the way, when the wet paper is dried on the belt, the dried belt-like paper (dry paper) is strongly attached to the belt. In particular, the tip of the wet paper formed at the initial stage of papermaking has a thickness. Because it is thin, it is stuck to the belt. The tip of the dried dry paper is thin, and its leading edge does not form a straight line along the width direction, and has a zigzag irregular shape.

  Therefore, as in Patent Document 1, when the dried dry paper is sequentially peeled from the holding surface of the smooth endless belt by the leading edge of the peeling member, a part of the uneven leading edge of the dry paper is the leading edge. Then, the belt-like dry paper after that is torn by the peeling member.

In addition, as in Patent Document 2, the configuration in which the sliding member is reciprocated in the width direction of the endless strip to peel off the deposits attached to the surface of the endless strip is a factor that increases the size of the apparatus.
The present invention solves the above-described problems, and an object thereof is to provide a papermaking machine and a papermaking method capable of safely peeling a belt-like paper dried from a conveyance belt for drying wet paper without causing damage. And

In order to solve the above problems, the paper machine of the present invention includes a paper making unit for making a belt-shaped wet paper, a drying unit for receiving and drying the belt-like wet paper, and receiving the dried belt-like paper and shaping it into a set specification. In a papermaking machine including a finishing unit that performs control and a control unit that controls each unit, a drying unit transports a belt-shaped wet paper, a heating device that heats the wet paper on the transport surface of the transport belt, and a transport A scraper provided so as to be in contact with and away from the belt conveying surface, and a contact edge of the scraper contacting the conveying surface of the conveying belt on the upstream side of the heating device in the wet paper conveying direction during a scraper driving device for driving a scraper for a retracted position spaced from the conveying surface, the control unit controls the scraper drive unit, the front and rear region of the leading edge of the wet paper is transported, the transport base And having a scraper control function unit to the conveying surface of the bets is brought into contact with scraper peeling the leading end portion including a leading edge of the wet paper from the conveying surface of the conveyor belt.

In the paper machine of the present invention, the scraper is characterized in that the contact end edge is opposed to the front end including the front end edge of the wet paper at the operating position.
In the papermaking machine of the present invention, the papermaking machine further includes a folding unit that folds back the leading end portion of the wet paper peeled from the transport surface of the transport belt in the wet paper transport direction.

  Further, in the papermaking machine of the present invention, the scraper has a plate shape extending in the width direction of the conveyance belt, and extends in the plate width direction along the conveyance direction of the wet paper from the contact edge contacting the conveyance surface of the conveyance belt. The contact edge is divided into a plurality of pieces by the slit.

In the papermaking machine of the present invention , the scraper also serves as a foreign matter removing device that removes foreign matter attached to the conveyor belt.

The papermaking method of the present invention includes a scraper driving device in a drying process in which a wet paper on a conveyance surface of a conveyance belt is heated and dried by a heating device via a conveyance belt while conveying the belt-shaped wet paper with a conveyance belt. In the wet paper transport direction, the front and back regions of the wet paper web are transported through the contact edge of the scraper that is provided in contact with and away from the transport surface of the transport belt upstream of the heating device. In the meantime, the front end portion including the front end edge of the wet paper is peeled off from the transport surface of the transport belt by being brought into contact with the transport surface of the transport belt.

  In the papermaking method of the present invention, the scraper is disposed in a posture in which the contact edge is opposed to the tip including the tip edge of the wet paper at the working position, and the wet paper is peeled off from the transport surface of the transport belt by the folding means. The front end of the paper is folded back toward the wet paper web transfer direction.

  Further, in the paper manufacturing method of the present invention, the contact edge of the scraper that also functions as a foreign matter removing device is brought into contact with the transport surface of the transport belt, and the infiltrated foreign matter attached to the transport surface of the transport belt is removed by the scraper. It is characterized by removing from.

  As described above, according to the present invention, papermaking is performed by making a belt-shaped wet paper in the papermaking section, drying the belt-shaped wet paper in the drying section, and shaping the dried belt-shaped paper (dry paper) to the set specifications in the finishing section. In the machine, the tip of the wet paper is peeled off from the transport surface of the transport belt by a scraper in the drying process, and the dried belt-shaped paper is sent to the finishing section in a state where the tip is peeled off from the transport surface of the transport belt.

  The tip of the wet paper web peeled off from the transport surface of the transport belt is straightened over the entire length of the scraper in the width direction of the wet paper as the wet paper is received by the scraper in the transport direction, and the paper is in a damp state without rigidity. By pushing down in the conveying direction along with the conveyance, the shape becomes bulky by being folded repeatedly into a bellows shape, a saddle shape, a pleat shape, or the like.

  In addition, the scraper contacts the conveying surface of the conveying belt on the upstream side of the heating device in the conveying direction of the wet paper, and the tip of the wet paper is peeled off from the conveying surface of the conveying belt by the scraper in the wet paper state. The wet paper web can be peeled off from the transport surface of the transport belt easily and safely without being damaged as compared with the case where the leading end of the belt is peeled from the transport surface of the transport belt.

For this reason, when sending the dried strip-shaped paper to the finishing section, the strip-shaped paper can be easily peeled off from the conveyor belt.
Since the scraper has a posture in which the contact edge is opposed to the tip including the tip edge of the wet paper at the action position, the scraper includes the tip edge of the wet paper as the contact edge moves from the action position to the retracted position. The leading end is in a state of separating from the conveying surface of the conveying belt.

  Paper fibers remain on the conveying surface of the conveying belt after the strip-like paper is peeled off, and the amount thereof increases by repeating the drying process, which causes a bad influence on the paper surface. For this reason, the remaining fibers are moistened with moisture, and the contact edge of the scraper is brought into contact with the conveying surface of the conveying belt, so that the infiltrated foreign matter adhering to the conveying surface of the conveying belt is removed by the scraper. It can be removed from the conveying surface of the conveying belt, and the scraper can also serve as a foreign matter removing device, so that the foreign matter removing device can be provided without increasing the size of the papermaking machine.

  Further, even if the scraper bends due to the force applied to the scraper, the contact edge is divided into a plurality of pieces by a plurality of slits extending in the wet paper web transport direction from the contact edge, so that the contact edge Each of the divided pieces maintains the linearity of the contact edge and abuts on the conveyance surface of the conveyance belt, so that it can be surely scooped up without missing the wet paper.

Schematic diagram showing a used paper recycling apparatus in an embodiment of the present invention (A) is an enlarged view showing a state at the retracted position of the scraper in the embodiment, (b) is an enlarged view showing a state at the working position of the scraper in the embodiment. Rear perspective view of the scraper Front perspective view of the scraper Side view showing the scraper drive device of the scraper (A) is an enlarged view showing the tip of the wet paper in the retracted position of the scraper in the same embodiment, (b) is an enlarged view showing a state in which the tip is advanced Schematic diagram showing the foreign matter removal function of the scraper (A) is an enlarged view showing a scraper in another embodiment of the present invention, (b) is an enlarged view showing a scraper in still another embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 7, a used paper processing apparatus 1 which is a kind of paper making machine includes a paper making unit 2 that performs a paper making process for making a belt-shaped wet paper 100, and a dewatering unit 3 that performs a dehydrating process for dehydrating the wet paper 100. A drying unit 4 that performs a drying process for drying the wet paper 100, a finishing unit 5 that performs a finishing process for shaping the dry paper 101, which is a dried strip-shaped paper, into a set specification, and a control unit 300 that controls each unit. It has.

  The paper making unit 2 has a wire belt 22 stretched between the first group of rollers 21 and a head box 23 for supplying the pulp suspension to the wire belt 22. Paper 100 is made. The wire belt 22 is made of metal or synthetic resin, has a mesh shape, and has water permeability and air permeability.

The dehydrating unit 3 has a water absorbing belt 32 made of a water absorbing material stretched between the second group of rollers 31, and here the water absorbing belt 32 is made of felt and has air permeability.
The water absorption belt 32 and the wire belt 22 are in contact with each other in the middle of both conveying tracks to form a papermaking transfer portion 201. In this paper transfer section 201, the angle formed by the wire belt 22 and the water absorbing belt 32, that is, the incident angle θ1 of the wire belt 22 with respect to the water absorbing belt 32 is 10 to 20 °, and the first group of rollers that support the wire belt 22 The diameter of 21 is from φ60 mm to φ80 mm.

  The wet paper 100 made on the conveying surface of the wire belt 22 by the paper making unit 2 is pressed by the water absorbing belt 32 in the paper making transfer unit 201, and the wire belt 22 is reversed along the outer periphery of the first group of rollers 21 to become wet. By separating from the paper 100, the wire belt 22 transfers to the water absorbing belt 32, and the water absorbing belt 32 absorbs water from the transferred wet paper 100 to absorb and dehydrate the wet paper 100. A spray nozzle 211 for spraying water onto the water absorbing belt 32 is provided on the upstream side of the papermaking transfer unit 201. The water absorption belt 32 is moistened with water sprayed from the spray nozzle 211 in the initial stage of operation.

  The drying unit 4 includes a drying roller 41 that includes a heating device such as a heater and forms a heating unit, and a conveyance belt made of a non-water-absorbing material that spans between the drying roller 41 and the third group of rollers 42. A conveyance holding belt 45 made of a non-water-absorbing material is provided between the smooth surface belt 43 and the fourth group of rollers 44. The water absorbing belt 32 and the smooth surface belt 43 of the dewatering unit 3 are in contact with each other in the middle of both conveying tracks, and the wet paper 100 is transferred from the water absorbing belt 32 of the dewatering unit 3 to the smooth surface belt 43 of the drying unit 4. A portion 202 is formed.

  A pair of dewatering rollers 51 and 52 that sandwich the smooth surface belt 43 and the water absorbing belt 32 are disposed in the dewatering transfer portion 202. In the present embodiment, the pair of dewatering rollers 51 and 52 are provided, but a plurality of sets of dewatering rollers 51 and 52 may be arranged. The pair of dewatering rollers 51 and 52 is one of the rollers 31 of the dewatering unit 3 that abuts on the water-absorbing belt 32 positioned on the lower side and has a diameter of φ90 mm to φ100 mm, and a smooth surface belt 43 positioned on the upper side. One of the rollers 42 of the drying unit 4 has a diameter of φ90 mm to φ120 mm. The dewatering rollers 51 and 52 are made of metal rollers, and those having an outer diameter of 80 to 200 mm are applicable.

  The dewatering rollers 51 and 52 squeeze and dehydrate the wet paper 100 between the two belts via the smooth surface belt 43 and the water absorption belt 32 and press the wet paper 100 against the smooth surface belt 43 so that the water absorption belt 32 is lowered. The wet paper web 100 is smoothly transferred from the water absorbing belt 32 to the smooth surface belt 43 by reversing along the outer periphery of the dehydrating roller 52 on the side and separating from the wet paper web 100.

  In the dewatering rollers 51 and 52, the plane A including both axes is inclined at a minute angle θ 3 with respect to the vertical surface B, and the upper dewatering roller 51 is positioned rearward in the conveying direction of the smooth surface belt 43 and the water absorbing belt 32. The lower dewatering roller 52 is positioned forward in the conveying direction of the smooth surface belt 43 and the water absorbing belt 32.

  The smooth surface belt 43 is made of metal or a synthetic resin having a heat resistant temperature of 150 ° C. or more, and here is a non-breathable belt made of a thin stainless steel plate (SUS430) having a thickness of 0.2 mm. As for the smooth surface belt 43, the conveyance surface which contacts the wet paper web 100 is a smooth surface, and the conveyance surface is coated with a silicone resin coating or a fluororesin coating.

In this embodiment, the aperture ratio of the water absorbing belt 32 is smaller than the aperture ratio of the wire belt 22, and the smooth surface belt 43 has a thin plate shape and is non-breathable.
The conveyance holding belt 45 has a mesh-like air permeability and is made of synthetic resin. The conveyance holding belt 45 is disposed to face the conveyance surface of the smooth surface belt 43 and sandwiches the wet paper 100 between the smooth surface belt 43. The smooth surface belt 43 and the conveyance holding belt 45 extend to a position where the dried dry paper 101 is delivered to the finishing unit 5 in the next process.

  In addition, by cleaning and fountaining each of the wire belt 22, the water absorbing belt 32, and the smooth surface belt 43, or by providing a scraper, a brush roller, or the like, dust such as paper dust attached to each belt surface can be removed. It is also possible to remove it.

  The finishing unit 5 includes a cutter 102 that cuts the dry paper 101 that forms the belt-like paper dried by the drying unit 4, and finishes the recycled paper 103 having a set size by the cutter 102. A guide 104 for guiding the dry paper 101 discharged from the smooth surface belt 43 to the cutter is provided upstream of the cutter 102 in the conveyance direction of the dry paper 101.

  Next, a scraper unit 400 is disposed on the track of the smooth surface belt 43 on the upstream side of the drying roller 41 in the conveyance direction of the wet paper 100. In the present embodiment, the scraper unit 400 also serves as a foreign matter removing device that removes foreign matter attached to the smooth surface belt 43.

  The scraper unit 400 includes a scraper 401 provided so as to be in contact with and away from the conveying surface of the smooth surface belt 43, a working position where the contact edge 402 of the scraper 401 contacts the conveying surface, and the contact edge 402 having a smooth surface belt. 43, a scraper driving device 450 that drives the scraper 401 over a retreat position that is separated from the conveying surface 43.

  As shown in FIGS. 2 to 4, the scraper 401 has a plate shape that extends in the width direction of the smooth surface belt 43 and has a length extending over the entire width of the smooth surface belt 43, and abuts against the conveyance surface of the smooth surface belt 43. A plurality of slits 403 extending in the plate width direction along the conveyance direction of the wet paper web 100 from the contact edge 402 are provided, and the contact edge 402 is divided into a plurality of pieces by the slit 403. The scraper 401 is preferably made of a synthetic resin such as polyester or polyacetal, rubber, metal or the like, and does not damage the smooth surface belt 43 and has excellent durability.

  As shown in FIG. 2B, the scraper 401 is in a posture in which the contact edge 402 faces the tip including the tip edge of the wet paper web 100 at the working position, and as shown in FIG. In this case, the contact edge 402 is oriented backward in the conveyance direction of the wet paper web 100. However, the direction in which the scraper 401 faces in the retracted position is not limited to the present embodiment, and may be an attitude that is 90 ° with respect to the transport surface, or another attitude.

  The scraper driving device 450 includes an attachment seat 451 for supporting the scraper 401, a cam follower 452 attached to the attachment seat 451, and a rotating support shaft 461 for rotatably supporting the scraper 401, the attachment seat 451, and the cam follower 452. A cam 453 that contacts the cam follower 452 to rotate the scraper 401 about the axis of the rotation support shaft 461 and a lever 454 connected to the mounting seat 451 are connected to the conveying surface of the smooth belt 43. It has a spring 455 that constitutes an urging means for turning it, a drive shaft 456 that drives the cam 453, and a motor 458 that rotationally drives the drive shaft 456 via a pulley 457.

  As shown in FIG. 5, the scraper unit 400 has a shield plate 459 that rotates integrally with the drive shaft 456 on one end side of the drive shaft 456 and a sensor 460 that is turned on / off when the optical axis is blocked by the shield plate 459. A shooter 462 is provided at a position below the scraper 401.

  The control unit 300 has a scraper control function unit that controls the scraper driving device 450 to bring the scraper 401 into contact with the conveyance surface of the smooth surface belt 43 in the front and rear regions of the leading edge of the wet paper web 100.

  The operation of the above configuration will be described. In the paper making unit 2, the pulp suspension is supplied from the head box 23 to the wire belt 22 to make the wet paper 100 on the conveying surface of the wire belt 22. In the dewatering unit 3, the wet paper 100 made on the conveying surface of the wire belt 22 in the paper making unit 2 is transferred to the water absorbing belt 32, and water is absorbed from the wet paper 100 by the water absorbing belt 32 to dehydrate the wet paper 100. The wet paper 100 of the wire belt 22 has a water content of about 99% immediately before the papermaking transfer section 201. In the papermaking transfer unit 201, the incident angle θ1 between the wire belt 22 and the water absorbing belt 32 is 10 to 20 °, and the diameter of the first group of rollers 21 is φ60 mm to φ80 mm. And the separation of the wet paper web 100 from the wire belt 22 can be performed smoothly.

  Moreover, since the opening rate of the wire belt 22 is larger than the opening rate of the water absorbing belt 32 and the air permeability is superior to the air permeability of the water absorbing belt 32, the peelability is larger than the peelability of the water absorbing belt 32. The adhesion of the belt 32 is superior to the adhesion of the wire belt 22. Therefore, the wet paper web 100 is easily peeled off from the wire belt 22 having high peelability, easily attached to the water absorbent belt 32 having high adhesiveness, and the wet paper web 100 is easily transferred from the wire belt 22 to the water absorbent belt 32, and is high. Provides transfer performance.

  In the drying unit 4, the wet paper 100 is absorbed and dehydrated by water absorption by the water absorption belt 32, and then the dehydration transfer unit 202 squeezes and dehydrates with the dehydration rollers 51 and 52 to transfer the wet paper 100 to the smooth surface belt 43.

  Further, the smooth surface belt 43 is non-breathable and has higher adhesion than the breathable water absorbing belt 32, in other words, the peelability of the water absorbing belt 32 is superior to the peelability of the smooth surface belt 43. Therefore, the wet paper 100 is easily peeled off from the water-absorbing belt 32 having high peelability, and is easily stuck to the smooth surface belt 43 having high adhesiveness, and the wet paper 100 is easily transferred from the water-absorbing belt 32 to the smooth surface belt 43. .

  As described above, in the present embodiment, the wet paper 100 is transferred from the wire belt 22 having high air permeability and excellent peelability to the water absorption belt 32 having low air permeability and excellent adhesion, and further the water absorption belt. By transferring from 32 to a smooth surface belt 43 having no air permeability and excellent adhesion, transfer of the wet paper 100 is always performed from a belt having excellent peelability to a belt having excellent adhesion, and thus excellent transfer. Performance can be realized.

  Then, the water squeezed by the dewatering rollers 51 and 52 in a state where the smooth surface belt 43 is positioned above the water absorbing belt 32 is discharged to a tray (not shown) disposed below the dewatering roller 52. Therefore, the water absorbing belt 32 that has passed through the dewatering rollers 51 and 52 is regenerated and can absorb water.

The smooth surface belt 43 to which the wet paper 100 is transferred advances toward the drying roller 41 and reaches the scraper unit 400.
The controller 300 determines that the leading edge of the wet paper reaches the scraper unit 400 when a certain time, for example, several tens of seconds elapses after the paper making is started, and controls the scraper unit 400 by the scraper control function unit. Before the leading edge reaches the scraper part 400, the contact edge 402 of the scraper 401 is brought into contact with the conveying surface of the smooth surface belt 43.

  That is, the motor 458 is driven to rotate the drive shaft 456 and the cam 453. The scraper 401 receives the urging force of the spring 455 and rotates around the axis of the rotation support shaft 461 together with the mounting seat 451 and the cam follower 452, and the contact edge 402 is brought into an operating position where it abuts against the conveying surface of the smooth surface belt 43. Be placed.

  When the sensor 460 detects that the scraper 401 has reached the operating position due to the rotation of the shielding plate 459, the control unit 300 maintains this state for a certain period of time. Thereafter, the motor 458 is driven to rotate the drive shaft 456 and the cam 453, the cam follower 452 is pressed by the cam 453, and the scraper 401, the mounting seat 451 and the cam follower 452 are rotated integrally against the urging force of the spring 455. The scraper 401 is disposed at a retreat position where the contact end edge 402 is separated from the conveying surface of the smooth surface belt 43 by rotating around the axis of the moving support shaft 461. When sensor 460 detects that scraper 401 has reached the retracted position due to rotation of shielding plate 459, control unit 300 stops motor 458.

By this control, the scraper 401 comes into contact with the conveyance surface of the smooth surface belt 43 in the front and rear regions of the leading edge of the wet paper 100.
Even if the scraper 401 bends due to the force applied to the scraper 401, the scraper 401 is divided into a plurality of pieces by the plurality of slits 403 extending from the contact edge 402 in the conveyance direction of the wet paper 100. Each of the divided pieces of the contact edge 402 abuts on the conveying surface of the smooth surface belt 43 while maintaining the linearity of the contact edge 402, so that the wet paper web 100 can be reliably picked up without missing.

  When the wet paper web 100 conveyed to the smooth surface belt 43 reaches the contact edge 402 of the scraper 401 in a state where the scraper 401 is in contact with the conveyance surface of the smooth surface belt 43, as shown in FIG. 401 engages with the leading edge of the wet paper web 100 to peel the leading edge from the conveying surface of the smooth surface belt 43.

  The leading end of the wet paper web 100 peeled off from the conveyance surface of the smooth surface belt 43 becomes linear over the entire length of the scraper 401 in the width direction of the wet paper web 100 when the wet paper web 100 is received by the scraper 401 in the conveyance direction, and has a rigid shape. By compressing the paper in a damp state in the conveying direction, it becomes bulky as it is folded several times in a bellows shape, a saddle shape, a pleat shape, or the like.

  As described above, the scraper 401 is in contact with the transport surface of the smooth surface belt 43 in the transport direction of the wet paper 100 and upstream of the position where the smooth surface belt 43 starts to contact the drying roller 41. 401, the front end of the wet paper web 100 is peeled off from the transport surface of the smooth surface belt 43, so that it is easier than in the case where the front end of the belt-like paper is peeled off from the transport surface of the smooth surface belt 43 after drying. Further, the wet paper web 100 can be safely peeled off from the conveying surface of the smooth surface belt 43 without causing damage.

  However, the position where the scraper 401 contacts the smooth surface belt 43 may be a section during which the smooth surface belt 43 contacts the drying roller 41, or may be a position after the smooth surface belt 43 passes the drying roller 41. good.

  As shown in FIG. 6 (a), the scraper 401 is brought into contact with the contact edge 402 from the working position where the contact edge 402 faces the tip including the tip edge of the wet paper web 100 as shown in FIG. 6 (a). When the edge 402 is rotated to a retracted position in a posture toward the rear in the conveyance direction of the wet paper 100, the leading end portion of the wet paper 100 having a shape of being folded in a accordion shape is separated from the conveyance surface of the smooth surface belt 43. When the scraper 401 is lifted and separated from the wet paper 100, the tip of the wet paper 100 hangs down from the conveying surface of the smooth surface belt 43 by its own weight.

  Next, the conveyance holding belt 45 runs parallel to the conveyance surface of the smooth surface belt 43 from the middle of the track of the smooth surface belt 43, and the wet paper web 100 is sandwiched between the conveyance holding belt 45 and the smooth surface belt 43. To do. At this time, the leading end portion of the wet paper web 100 that hangs downward from the conveyance surface of the smooth surface belt 43 is sandwiched between the conveyance holding belt 45 and the smooth surface belt 43 and folded back in the conveyance direction. That is, in the present embodiment, the conveyance holding belt 45 serves as a folding means.

  In the present embodiment, the tip of the wet paper web 100 is folded by being sandwiched between the conveyance holding belt 45 and the smooth surface belt 43, but the folding means is constituted by other rollers, plate-like materials, or the like. Alternatively, the scraper 401 can also serve as a folding means.

  In this case, as shown in FIG. 6A, the contact edge 402 of the scraper 401 is rotated to a retracted position in a posture toward the rear in the conveyance direction of the wet paper web 100, thereby being stacked in a bellows shape. As shown in FIG. 6B, the tip of the wet paper 100 having a folded shape is lifted from the conveying surface of the smooth belt 43 and the scraper 401 is kept in contact with the front end of the wet paper 100. In addition, as the smooth surface belt 43 advances, the tip of the wet paper 100 is folded backward in the wet paper transport direction.

  Next, the conveyance holding belt 45, the smooth surface belt 43, and the wet paper web 100 move along with the rolling of the drying roller 41 in a state where the wet paper web 100 is sandwiched between the conveyance holding belt 45 and the smooth surface belt 43, The wet paper 100 is dried by the heat received from the drying roller 41 to form a dry paper 101 forming a belt-like paper. At this time, since the wet paper 100 is in close contact with the smooth surface belt 43 at the dehydration transfer portion 202, the thermal conductivity between the smooth surface belt 43 and the wet paper 100 is improved, and high thermal efficiency is realized.

  Further, since the wet paper 100 is held on the smooth surface belt 43 and wound on the roller surface of the drying roller 41 and dried in that state, the extra man-hour such as transferring the wet paper 100 to the surface of the drying roller 41 is performed. Is not required, and the conveyance efficiency is improved.

  The smooth surface belt 43 and the conveyance holding belt 45 extend to a position where the dry paper 101 is delivered to the finishing unit 5 and are reversed in directions opposite to each other to peel the dry paper 101. At this time, the dried belt-shaped paper is sent to the finishing unit 5 with its leading end peeled off from the conveying surface of the conveying belt.

  For this reason, the guide 104 guides the leading end portion of the dry paper 101 peeled off from the conveying surface of the smooth surface belt 43, so that the dry paper 101 following the leading end portion is guided by the guide 104 over its entire width, and the dry paper 101 is easy. Is peeled off. By making the leading edge of the dry paper 101, which is a dried belt-like paper, folded back toward the conveyance direction, the smooth surface belt 43 and the conveyance holding belt 45 are reversed in directions opposite to each other, and the dry paper 101 is removed. At the time of peeling, the dry paper 101 is easily peeled from the smooth surface belt 43 with the folded back edge as the starting point.

In the finishing unit 5, the dry paper 101 that forms the belt-like paper peeled off from the smooth surface belt 43 and the conveyance holding belt 45 is finished with a cutter 102 into a recycled paper 103 having a set size.
By the way, paper fibers remain on the conveying surface of the smooth surface belt 43 after the dry paper 101 is peeled off, and the amount thereof is increased by repeating the drying process, which causes a bad influence on the paper surface. For this reason, water is sprayed from the spray nozzle 211 to give moisture to the water absorbing belt 32, and moisture remaining from the water absorbing belt 32 to the fibers remaining on the smooth surface belt 43 is brought into a wet state, and the contact edge 402 of the scraper 401. Is brought into contact with the conveying surface of the smooth surface belt 43, so that the infiltrated foreign matter adhering to the conveying surface of the smooth surface belt 43 can be removed from the conveying surface of the smooth surface belt 43 by the scraper 401. The removed foreign matter 463 is discharged by the shooter 462 to the trash box 500 installed below the shooter 462. In this way, the scraper 401 also serves as a foreign matter removing device, so that the foreign matter removing device can be provided without increasing the size of the papermaking machine.

  In the embodiment described above, an example in which the scraper 401 swings is shown, but the angle at which the scraper 401 abuts on the smooth surface belt 43 is not limited, and any angle can be used. Moreover, as shown to Fig.8 (a), it is also possible to set it as the structure which moves the scraper 401 linearly over an action position and a retracted position, and as shown to FIG. A rotating body having the blades 411 may be used, or a roller that rotates slower than the square bar or the smooth surface belt 43 may be used.

DESCRIPTION OF SYMBOLS 1 Used paper processing apparatus 2 Paper making part 3 Dehydration part 4 Drying part 5 Finishing part 21, 21a, 21b 1st group roller 22 Wire belt 23 Head box 31 2nd group roller 32 Water absorption belt 41 Drying roller 42 3rd group roller 43 Smooth surface belt 44 Fourth group roller 45 Conveying and holding belt 51, 52 Dewatering roller 100 Wet paper 101 Dry paper 102 Cutter 103 Recycled paper 104 Guide 201 Papermaking transfer unit 202 Dehydration transfer unit 211 Spray nozzle 300 Control unit 400 Scraper unit 401 Scraper 402 Contact edge 403 Slit 411 Blade 450 Scraper driving device 451 Mounting seat 452 Cam follower 453 Cam 454 Lever 455 Spring 456 Drive shaft 457 Pulley 458 Motor 459 Shielding plate 460 Sensor 461 Rotating support shaft 462 Shuta 463 Foreign object 500 Trash

Claims (8)

A papermaking machine comprising a paper making unit for making a belt-shaped wet paper, a drying unit for receiving and drying the belt-like wet paper, a finishing unit for receiving the dried belt-like paper and shaping it to a set specification, and a control unit for controlling each part In
A drying unit that transports the belt-shaped wet paper, a heating device that heats the wet paper on the transport surface of the transport belt, a scraper that is provided in contact with and away from the transport surface of the transport belt, and A scraper driving device that drives the scraper over a working position where the contact edge of the scraper contacts the transport surface of the transport belt on the upstream side of the heating device in the wet paper transport direction and a retracted position where the contact edge separates from the transport surface; Have
While the control unit controls the scraper driving device and the front and rear areas of the leading edge of the wet paper are being conveyed, the scraper is brought into contact with the conveying surface of the conveying belt so that the leading end including the leading edge of the wet paper is conveyed to the conveying belt. A paper machine having a scraper control function part for peeling from the transport surface of the paper.   The paper machine according to claim 1, wherein the scraper is in a posture in which the contact edge is opposed to a tip portion including a tip edge of the wet paper at the operation position.   The papermaking machine according to claim 1, further comprising a folding unit that folds back the front end of the wet paper peeled from the transport surface of the transport belt in the wet paper transport direction.   The scraper has a plate shape extending in the width direction of the conveyance belt, and has a plurality of slits extending in the plate width direction along the conveyance direction of the wet paper from the contact edge contacting the conveyance surface of the conveyance belt. The papermaking machine according to any one of claims 1 to 3, wherein the edge is divided into a plurality of pieces.   The paper machine according to any one of claims 1 to 4, wherein the scraper also serves as a foreign matter removing device that removes foreign matter attached to the conveyor belt. In the drying process in which the wet paper on the transport surface of the transport belt is dried by heating with a heating device via the transport belt while transporting the belt-shaped wet paper with the transport belt,
The scraper drive device is controlled so that the contact edge of the scraper provided in contact with and away from the transport surface of the transport belt upstream of the heating device in the wet paper transport direction is the front and rear region of the front edge of the wet paper A paper-making method characterized in that the front end portion including the front edge of the wet paper is peeled off from the transport surface of the transport belt while being brought into contact with the transport surface of the transport belt while the paper is transported.   The scraper is arranged in a posture in which the contact edge is opposed to the tip including the tip edge of the wet paper at the working position, and the tip of the wet paper peeled off from the transport surface of the transport belt by the folding means is transferred in the wet paper transport direction. The papermaking method according to claim 6, wherein the papermaking method is folded back to the back of the paper.   The contact edge of the scraper that also serves as a foreign matter removing device is brought into contact with the transport surface of the transport belt, and the infiltrated foreign matter attached to the transport surface of the transport belt is removed from the transport surface of the transport belt by the scraper. Item 8. A papermaking method according to Item 6 or 7.

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