JP2015074857A - Sheet manufacturing device and sheet manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet manufacturing device capable of surely cutting a sheet.SOLUTION: A sheet manufacturing device includes: a formation part for at least forming a web in which fiber is accumulated; a cutting part for cutting the web; a detection part for detecting sagging of the web on a more upstream side in a web conveyance direction than the cutting part; a cutting part front roller for conveying the web by a roller on the more upstream side in the web conveyance direction than the cutting part; and a cutting part rear roller for conveying the web by the roller on a more downstream side in the web conveyance direction than the cutting part. The sheet manufacturing device has a control unit which, during a period before the cutting part rear roller starts to convey the web after the web is cut by the cutting part, makes the rotational speed of the cutting part front roller faster when sagging is larger compared to the case when sagging is small, and makes the rotational speed of the cutting part front roller slower when sagging is smaller compared to the case when sagging is large, and during a period before the cutting part cuts the web after the cutting part rear roller starts to convey the web, makes the cutting part front roller rotate more slowly than the cutting part rear roller.

Description

  The present invention relates to a sheet manufacturing apparatus and a sheet manufacturing method.

  2. Description of the Related Art Conventionally, there is known a unit mounting body supply apparatus that manufactures a unit mounting body by cutting a belt-shaped film conveyed by a driving roller with a predetermined dimension. In the unit mounting body supply apparatus, before cutting the belt-shaped film, the driving roller is driven based on the detection result detected by the sensor for detecting the slack of the belt-shaped film so that the belt-shaped film is slackened to a predetermined amount or more. (For example, refer to Patent Document 1).

International Publication No. 2007/088873 Pamphlet

  By the way, in the case of manufacturing a sheet by transporting a web on which fibers are deposited, if the driving roller is controlled on the upstream side in the web transport direction as in the above-described apparatus, the deposited thickness of the web varies. For this reason, when manufacturing a sheet | seat, it is necessary to control the slack of a web with the drive roller (before cutting) arrange | positioned downstream. However, a cutting part is disposed on the downstream side of the driving roller (before cutting). When the web is cut at the cutting portion, the driving roller (before cutting) is used to apply tension to the web with the driving roller (before cutting) and the driving roller (after cutting) arranged on the downstream side of the cutting portion. The rotation speed of the drive roller (after cutting) is controlled to be faster than the rotation speed of). However, if the driving roller (before cutting) is driven to adjust the slack of the web, the web tension between the driving roller (before cutting) and the driving roller (after cutting) is lost. There has been a problem that it cannot be cut reliably.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A sheet manufacturing apparatus according to this application example includes a web forming unit that forms at least a web on which fibers are deposited, a cutting unit that cuts the web, and a conveyance direction of the web relative to the cutting unit. A detection unit that detects sagging of the web upstream, a cutting unit front roller that conveys the web by a roller upstream of the cutting unit in the web conveyance direction, and a web conveyance direction of the web from the cutting unit. A cutting section rear roller that conveys the web by a roller downstream; and the cutting section rear roller starts to convey the web after the cutting section has been cut by the cutting section. The rotation speed of the roller in front of the cutting part is increased when the slack is large than when the slack is small, and the slack is The rotation speed of the roller before the cutting unit is slower than when the sagging is greater than when the die is cut, and after the roller after the cutting unit starts to transport the cut web, the cutting unit cuts the web. Between, it has a control part which rotates the roller before the cutting part slower than the roller after the cutting part.

  According to this configuration, the web from when the web is cut by the cutting section to the time when the web after the cutting section is conveyed, that is, the roller before the cutting section and the roller after the cutting section are continuously connected to the same web. While W (W1) is not conveyed at the same time and only the roller before the cutting unit is conveying the web, the rotation speed of the roller before the cutting unit is controlled according to the slack of the web before cutting. As a result, the web slack is controlled so as not to become large or small. On the other hand, from the time when the roller after the cutting part starts to convey the cut web until the cutting part cuts the web, that is, when the continuous web is being conveyed by the roller before the cutting part and the roller after the cutting part, The roller before the cutting part is controlled to rotate slower than the roller after the cutting part. If it does so, since tension will be applied to a web and it will be cut in the state where tension was given to a web, a web can be cut certainly.

  Application Example 2 In the sheet manufacturing apparatus according to the application example described above, when the slack is large, the rotation speed of the roller before the cutting unit is increased within a range that is not faster than the rotation speed of the roller after the cutting unit. And

  If the roller before the cutting part is rotated faster than the roller after the cutting part after the web is cut, the webs before and after the cutting are overlapped with each other, and a conveyance failure occurs. Therefore, according to the above configuration, the rotation speed of the roller before the cutting unit is controlled in a range that does not become faster than the rotation speed of the roller after the cutting unit. The web never catches up. Accordingly, there is no overlap between the webs before and after cutting, and conveyance troubles can be prevented.

  Application Example 3 In the sheet manufacturing apparatus according to the application example described above, a one-way clutch is used for a drive transmission unit that rotates the roller in front of the cutting unit.

  According to this configuration, when the web is pulled by the speed difference between the front roller and the rear roller before and after the cutting portion, the front roller of the cutting portion idles and excessive tension is suppressed. It is possible to prevent the occurrence of damage such as tearing of the web.

  Application Example 4 In the sheet manufacturing apparatus according to the application example described above, the sheet manufacturing apparatus includes a conveyance roller that conveys the web downstream of the cutting portion rear roller in the conveyance direction of the web, and the conveyance roller is the cutting portion rear roller. It is characterized by faster rotation.

  According to this configuration, it is possible to prevent the web from staying in the cutting portion by rapidly rotating the conveyance roller downstream of the cutting portion rear roller.

  Application Example 5 In the sheet manufacturing apparatus according to the application example described above, the sheet manufacturing apparatus does not include a detection unit that detects slack between the roller behind the cutting unit and the conveyance roller.

  According to this configuration, before the web is cut, the sag is accumulated so that the sag is detected. However, after the web is cut, the sag is required, and since the sag is not accumulated, the sag is not required. Therefore, this can simplify the apparatus configuration.

  Application Example 6 In the sheet manufacturing method according to this application example, a web forming unit that forms a web on which at least fibers are deposited, a cutting unit that cuts the web, and a conveyance direction of the web rather than the cutting unit. A detection unit that detects sagging of the web upstream, a roller in front of the cutting unit that transports the web by a roller upstream of the cutting process in the web transport direction, and a web transport direction in the web direction that is higher than the cutting unit. A cutting section rear roller that conveys the web by a roller downstream, and a sheet manufacturing method in a sheet manufacturing apparatus, wherein the cutting section rear roller is cut after the web is cut by the cutting section Rotation of the roller in front of the cutting section when the slack is large than when the slack is small before the web starts to be conveyed When the sag is small, the rotation speed of the roller before the cutting unit is slower than when the sag is large, and after the cutting unit the roller after the cutting unit starts to transport the cut web, Until the web is cut, the roller before the cutting portion is rotated slower than the roller after the cutting portion.

  According to this configuration, the web from when the web is cut by the cutting section to the time when the web after the cutting section is conveyed, that is, the roller before the cutting section and the roller after the cutting section are continuously connected to the same web. While W (W1) is not conveyed at the same time and only the roller before the cutting unit is conveying the web, the rotation speed of the roller before the cutting unit is controlled according to the slack of the web before cutting. As a result, the web slack is controlled so as not to become large or small. On the other hand, from the time when the roller after the cutting part starts to convey the cut web until the cutting part cuts the web, that is, when the continuous web is being conveyed by the roller before the cutting part and the roller after the cutting part, The roller before the cutting part is controlled to rotate slower than the roller after the cutting part. If it does so, since tension will be applied to a web and it will be cut in the state where tension was given to a web, a web can be cut certainly.

Schematic which shows the structure of a sheet manufacturing apparatus. The block diagram which shows the structure of the control part of a sheet manufacturing apparatus. The flowchart which shows the control method of a sheet manufacturing apparatus. The schematic diagram which shows operation | movement of a sheet manufacturing apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the scale of each member or the like is shown differently from the actual scale so as to make each member or the like recognizable.

  First, the configuration of the sheet manufacturing apparatus will be described. The sheet manufacturing apparatus is based on a technology for forming a raw material (defibrated material) Pu such as a pure pulp sheet or used paper on a new sheet Pr, for example. The sheet manufacturing apparatus according to the present embodiment detects a sagging of the web upstream of a web forming unit that forms a web on which fibers are deposited, a cutting unit that cuts the web, and a web conveying direction from the cutting unit. A detection unit, a roller before the cutting unit that conveys the web by a roller upstream of the cutting unit in the conveyance direction of the web, and a roller after the cutting unit that conveys the web by a roller downstream of the cutting unit in the conveyance direction of the web; Between the time when the web is cut by the cutting section and the time when the roller after the cutting section starts to feed the cut web than when the slack is small The rotation speed of the front roller is increased, and when the slack is small, the rotation speed of the front roller is slower than when the slack is large. Cuts from the start of conveying the web after the roller is disconnected section is until the cutting of the web has a control unit for rotating slower than the cut portion after the roller cutting unit front roller. In addition, the web concerning this embodiment says the structure form of the object containing a fiber and resin. Therefore, even when the shape or the like changes during heating, pressurizing, cutting, or conveying the web, the web is shown. Hereinafter, the configuration of the sheet manufacturing apparatus will be specifically described.

  FIG. 1 is a schematic diagram illustrating a configuration of a sheet manufacturing apparatus according to the present embodiment. As shown in FIG. 1, the sheet manufacturing apparatus 1 includes a supply unit 10, a crushing unit 20, a defibrating unit 30, a classification unit 40, a receiving unit 50, an additive charging unit 60, and a web forming unit. 70, a transport unit 100, a heating and pressing unit 150, and the like. Furthermore, in the present embodiment, a sag detection unit 180, a front cutting unit roller 120, a rear cutting unit roller 125, a cutting unit 110, a tip detection unit 190, and the like are provided. And the control part 2 (refer FIG. 2) which controls these members is provided.

  The supply unit 10 supplies the used paper Pu to the crushing unit 20. The supply unit 10 includes, for example, a tray 11 that accumulates and stores a plurality of used paper Pu, and an automatic feeding mechanism 12 that can continuously input the used paper Pu in the tray 11 to the crushing unit 20. The used paper Pu supplied to the sheet manufacturing apparatus 1 is, for example, A4 size paper that is currently mainstream in offices.

  The crushing unit 20 cuts the supplied used paper Pu into pieces of several centimeters square. The crushing unit 20 includes a crushing blade 21 and constitutes an apparatus in which the cutting width of a normal shredder blade is widened. Thereby, the supplied used paper Pu can be easily cut into pieces of paper. Then, the divided coarsely crushed paper is supplied to the defibrating unit 30 via the pipe 201.

  The defibrating unit 30 includes a rotating rotary blade (not shown), and defibrates the crushed paper supplied from the crushing unit 20 in a fiber shape. In addition, the defibrating unit 30 of the present embodiment performs defibrating in a dry manner in the air. By the defibrating process of the defibrating unit 30, printed ink, toner, a material for application to paper such as a bleeding prevention material, etc., become tens of μm or less and separate from the fibers (hereinafter referred to as “ink particles” "). Therefore, the defibrated material that comes out from the defibrating unit 30 is fibers and ink particles obtained by defibrating the paper pieces. Then, the airflow is generated by the rotation of the rotary blade, and the fiber defibrated via the pipe 202 is carried on the airflow and conveyed to the classification unit 40. In addition, when using the dry type defibrating part 30 which is not equipped with a wind generation mechanism, what is necessary is just to provide separately the airflow generator which generates an airflow from the crushing part 20 toward the defibrating part 30. FIG.

  The classifying unit 40 classifies the defibrated material into ink particles and fibers. In the present embodiment, a cyclone as the classifying unit 40 (hereinafter, described as a cyclone 40 as the classifying unit) is applied, and the conveyed fibers are classified into air currents into ink particles and deinked fibers (deinked defibrated material). To do. Note that another type of airflow classifier may be used instead of the cyclone 40. In this case, as an airflow classifier other than the cyclone 40, for example, an elbow jet, an eddy classifier, or the like is used. The airflow classifier generates a swirling airflow, which is separated and classified by the difference in centrifugal force received depending on the size and density of the defibrated material, and the classification point can be adjusted by adjusting the speed and centrifugal force of the airflow. . As a result, the ink particles are divided into relatively small and low density ink particles and fibers larger than the ink particles and high density. Removing ink particles from fibers is called deinking.

  The cyclone 40 has a structure in which a tangential input type cyclone is relatively simple. The cyclone 40 of the present embodiment includes an introduction port 40a introduced from the defibrating unit 30, a cylindrical portion 41 with the introduction port 40a attached in a tangential direction, a conical portion 42 following the lower portion of the cylindrical portion 41, and the conical portion 42. A lower outlet 40b provided in the lower portion and an upper exhaust port 40c for discharging fine powder provided in the upper center of the cylindrical portion 41 are configured. The diameter of the conical portion 42 decreases toward the lower side in the vertical direction.

  In the classification process, the airflow on which the defibrated material introduced from the introduction port 40a of the cyclone 40 is turned into a circular motion in the cylindrical portion 41, and centrifugal force is applied. , It moves to the inverted conical part 42. Further, the separated ink particles are led to the upper exhaust port 40c as fine powder together with air, and deinking proceeds. Then, the short fiber mixture containing a large amount of ink particles is discharged from the upper exhaust port 40 c of the cyclone 40. Then, the short fiber mixture containing a large amount of discharged ink particles is collected in the receiving unit 50 via the pipe 203 connected to the upper exhaust port 40 c of the cyclone 40. On the other hand, the deinked fibers are conveyed from the lower outlet 40b of the cyclone 40 toward the web forming unit 70 through the pipe 204. Note that suction may be performed from the upper exhaust port 40c.

  Further, in the middle of the pipe 204 through which the deinked fibers are conveyed from the cyclone 40 to the web forming unit 70, a resin (for example, a fusion resin or a thermosetting resin) is used for the deinked fibers to be conveyed. An additive charging unit 60 for adding an additive is provided. In addition to the fusion resin, for example, a flame retardant, a whiteness improver, a sheet strength enhancer, a sizing agent, and the like can be added as the additive. These additives are stored in the additive storage unit 61 and are charged from the charging port 62 by a charging mechanism (not shown).

  The web forming unit 70 forms a web containing fibers and resin introduced from the pipe 204. The web forming unit 70 has a mechanism for uniformly dispersing the fibers in the air and a mechanism for depositing the dispersed fibers on the mesh belt 73.

  First, as a mechanism for uniformly dispersing the fibers in the air, the web forming unit 70 is provided with a forming drum 71 into which the fibers and the resin are put. Then, the resin (additive) can be uniformly mixed in the fiber by rotationally driving the forming drum 71. A screen having a plurality of small holes is provided on the surface of the forming drum 71. Further, a rotatable needle roll is provided inside the forming drum 71 so as to float the input fibers. With such a configuration, the fibers that have passed through the small holes can be uniformly dispersed in the air.

  On the other hand, below the forming drum 71, an endless mesh belt 73 in which a mesh stretched by stretch rollers 72 (four stretch rollers 72a to 72d in this embodiment) is formed is disposed. . The mesh belt 73 is moved in one direction by rotating at least one of the stretching rollers 72.

  In addition, a suction device 75 as a suction unit that generates an airflow directed vertically downward is provided below the forming drum 71 via a mesh belt 73. The suction device 75 can suck the fibers dispersed in the air onto the mesh belt 73.

  When the entangled fibers are introduced from the cyclone 40 into the forming drum 71 of the web forming unit 70, the fibers and the resin are loosened by a needle roll or the like. The loosened fibers pass through a small hole screen on the surface of the forming drum 71 and are deposited on the mesh belt 73 by the suction force of the suction device 75. At this time, by moving the mesh belt 73 in one direction, it is possible to form the web W in which fibers and resin are deposited in a long shape. A continuous web W is formed by continuously performing dispersion from the forming drum 71 and movement of the mesh belt 73. The mesh belt 73 may be metallic, resinous, or non-woven fabric, and may be anything as long as fibers can be deposited and an air stream can pass therethrough. When the mesh hole diameter of the mesh belt 73 is too large, fibers enter between the meshes, resulting in unevenness when the web (sheet) is formed. On the other hand, when the mesh hole diameter is too small, the suction device 75 It is difficult to form a stable airflow. For this reason, it is preferable to adjust the hole diameter of a mesh suitably. The suction device 75 can be configured by forming a sealed box with a window of a desired size opened under the mesh belt 73, and sucking air from other than the window to make the inside of the box have a negative pressure from the outside air.

  The web W formed on the mesh belt 73 is transported by the transport unit 100. The conveyance unit 100 according to the present embodiment illustrates a conveyance process of the web W from when the mesh belt 73 is finally put into the stacker 160 as a sheet Pr (web W). Therefore, in addition to the mesh belt 73, a later-described transport belt device 101 and various rollers function as a part of the transport unit 100. As the transport unit, there may be at least one of a transport belt, a transport roller, and the like. Specifically, first, the web W formed on the mesh belt 73 which is a part of the transport unit 100 is transported according to the transport direction (arrow in the figure) by the rotational movement of the mesh belt 73. Next, the web W is transferred from the mesh belt 73 to the transport belt device 101 and transported according to the transport direction (arrow in the figure).

  A pressure unit is disposed on the downstream side of the web forming unit 70 in the conveyance direction of the web W. In addition, the pressurization part of this embodiment is the preheating pressurization part 140 which has a pair of roller 141 which heat-presses the web W at low temperature or a low load. A heating member such as a heater is provided at the center of the rotating shaft of the roller 141, and the web W can be heated and pressurized by passing the web W between the pair of rollers 141. Thereby, the strength of the web W can be improved.

  A pre-cut section roller 120 is disposed on the downstream side of the preheating and pressing section 140 in the conveyance direction of the web W. The front cutting unit roller 120 includes a pair of rollers 121, and one roller 121 is a drive control roller, and is driven and controlled by the control unit 2. The other roller 121 is a driven roller. A first buffer unit 170 that holds the slackened web is disposed between the conveyance belt device 101 and the cutting unit front roller 120 in the conveyance direction of the web W. In addition, the first buffer unit 170 is provided with a sag detection unit 180 that detects the sag of the web W. The sagging detection unit 180 is configured by, for example, an optical sensor or an ultrasonic sensor. Based on the amount of sag of the web W detected by the sag detector 180, the cutting unit front roller 120 (drive control roller 121) is driven and controlled. Accordingly, the web W is transported in a state where the web W is slackened by a predetermined amount on the upstream side of the front cutting section roller 120 in the transport direction of the web W. Thereby, for example, when the transport amount of the web W transported from the preheating and pressurizing unit 140 side is smaller than the transport amount desired to be transported by the roller 120 in front of the cutting unit, the web W is excessively tensioned. There is a risk of tearing or damage. Therefore, the above-mentioned problem can be prevented by transporting the web W while slackening it.

  Further, a one-way clutch is used for a drive transmission unit that rotates the front cutting unit roller 120. The one-way clutch has a clutch mechanism that transmits rotational force only in one direction, and is configured to idle in the opposite direction. As a result, when an excessive tension is applied to the web W due to the speed difference between the post-cutting section rear roller 125 and the pre-cutting section roller 120, which will be described later, the web W runs idle on the pre-cutting section roller 120 side. It is suppressed and the web W can be prevented from being torn off.

  A cutting unit 110 that cuts the web W in a direction that intersects the transport direction of the web W to be transported is disposed on the downstream side of the front roller 120 in the transport direction of the web W. The cutting unit 110 includes a cutter, and cuts the continuous web W into sheets (sheets) according to a cutting position set to a predetermined length. The cutting unit 110 may be a rotary cutter, for example. According to this, it becomes possible to cut while conveying the web W. Accordingly, since the conveyance of the web W is not stopped at the time of cutting, the manufacturing efficiency can be improved. Further, since the amount of sag of the web W in the first buffer unit 170 can be reduced, the occurrence of curling of the web W during cutting can be reduced.

  A cutting portion rear roller 125 is disposed downstream of the cutting portion 110 in the web W conveyance direction. The post-cutting section roller 125 includes a pair of rollers 126, and one roller 126 is a drive control roller, and is driven and controlled by the control unit 2. The other roller 126 is a driven roller.

  A leading end detection unit 190 that detects the leading end of the web W is disposed downstream of the cutting portion rear roller 125 in the conveyance direction of the web W. The tip detection unit 190 is, for example, an optical sensor.

  When the leading end detection unit 190 detects the leading end of the web W conveyed from the post-cutting portion roller 125, the passage timing of the web W is acquired. Further, the conveyed web W is nipped between the roller 120 before the cutting unit and the roller 125 after the cutting unit. Then, after a predetermined time, the cutting unit 110 is driven to cut the web W.

  A transport roller that transports the web W via the second buffer unit 171 is provided on the downstream side in the transport direction of the web W from the post-cutting roller 125. The conveyance roller is rotated faster than the cutting portion rear roller 125. By configuring in this way, the downstream web W is transported quickly, so that, for example, the web W can be prevented from staying at the cutting section 110 on the upstream side, and the transport efficiency of the web W can be improved. In addition, the conveyance roller concerning this embodiment is a pair of heat press roller 151 which comprises the heat press part 150. FIG.

  The heating and pressing unit 150 binds (fixes) the fibers contained in the web W through a resin. A heating member such as a heater is provided at the center of the rotating shaft of the heating and pressing roller 151, and the web W being conveyed is heated by passing the web W between the pair of heating and pressing rollers 151. Can be pressurized. The web W is heated and pressed by the pair of heating and pressing rollers 151, so that the resin melts and becomes easily entangled with the fibers, and the fiber interval is shortened and the contact point between the fibers is increased. Thereby, a density increases and the intensity | strength as the web W improves.

  In addition, it does not have a detection part which detects a slack between the cutting part back roller 125 and the heating-pressing part 150 as a conveyance roller. This is because the slack accumulates before the web W is cut, so it is necessary to detect the slack. However, after the web W is cut, the continuous state changes to the single wafer state, and the slack does not accumulate. This is because it becomes unnecessary. Thereby, the apparatus configuration is simplified.

  A rear cutting unit 130 that cuts the web W along the conveyance direction of the web W is disposed downstream of the heating and pressurization unit 150 in the conveyance direction of the web W. The rear cutting unit 130 includes a cutter and cuts according to a predetermined cutting position in the conveyance direction of the web W. Thereby, a sheet Pr (web W) having a desired size is formed. Then, the cut sheet Pr (web W) is stacked on the stacker 160 or the like.

  Next, the configuration of the control unit will be described. FIG. 2 is a block diagram illustrating a configuration of a control unit of the sheet manufacturing apparatus. FIG. 2 shows a control block diagram of the conveyance unit 100 as a part of the sheet manufacturing apparatus. As shown in FIG. 2, the control unit 2 includes a command unit 3 and a drive unit 8. The command unit 3 includes a CPU (Central Processing Unit) 4 for executing various programs, a RAM (Random Access Memory) 5 for temporarily storing data and programs, various data, various programs and the like in advance. A ROM (Read Only Memory) 6 and an interface 7 are provided. The CPU 4 processes various signals input via the interface 7 based on the data in the RAM 5 and ROM 6 and outputs a control signal to the drive unit 8 via the interface 7.

  The drive unit 8 includes various drivers, and includes a conveyor belt device 101, a preheating and pressing unit 140, a pre-cutting roller 120, a post-cutting roller 125, a heating and pressing unit 150, a cutting unit 110, a post-cutting unit 130, and a detection. Unit 180, tip detection unit 190, and the like. And based on the control signal of the instruction | command part 3, it is comprised so that each part, an apparatus, etc. may be controlled.

  Next, a control method for the sheet manufacturing apparatus will be described. Specifically, the conveyance drive control of the web W after the web W is formed will be described. FIG. 3 is a flowchart showing a control method of the sheet manufacturing apparatus, and FIG. 4 is a schematic diagram showing the operation of the sheet manufacturing apparatus.

  First, a series of flows for manufacturing a sheet will be described. As shown in FIG. 4, the web W (W <b> 1) formed by the web forming unit 70 is transported to the preheating and pressing unit 140 and heated and pressed by the preheating and pressing unit 140. Thereby, the strength of the web W (W1) is improved. Then, the web W (W1) is conveyed to the front cutting section roller 120 via the first buffer section 170. And by the drive of the roller 120 before a cutting part, it passes the cutting part 110 and is conveyed to the roller 125 side after a cutting part. When the web W (W1) reaches the cutting section rear roller 125, the cutting section rear roller 125 is also driven to transport the web W (W1) further downstream. And the passage timing of web W (W1) is acquired by the front-end | tip detection part 190 arrange | positioned downstream of the cutting part back roller 125, and the cutting part 110 is driven after predetermined time, and web W (W1) is cut | disconnected. . As a result, the continuous web W (W1) is cut into a sheet-like (sheet-like) web W (W2) having a predetermined length. Thereafter, the sheet-shaped web W (W2) is conveyed to the downstream heating / pressurizing unit 150 by the cutting unit rear roller 125. Then, the fibers included in the web W (W2) are bound (fixed) via the resin by the heating and pressing unit 150. Thereafter, the sheet is conveyed to the rear cutting unit 130 on the downstream side of the heating and pressing unit 150 and is cut according to a predetermined cutting position in the conveying direction of the web W (W2), and a sheet Pr (web W (W2)) having a desired size is obtained. It is formed. Then, the cut sheet Pr (web W (W2)) is stacked on the stacker 160 (see FIG. 1). Details will be described below.

  As shown in FIG. 3, first, in step S <b> 10, a period from when the web W (W <b> 1) is cut by the cutting unit 110 to when the web W (W <b> 1) from which the post-cutting unit roller 125 is cut starts to be conveyed. Determine whether or not. That is, the roller 120 before the cutting unit and the roller 125 after the cutting unit do not simultaneously convey the same continuous web W (W1), and only the roller 120 before the cutting unit conveys the web W (W1). It is determined whether it is between. If yes, then continue with step S11, otherwise continue with step S20. And in step S11, drive control of the roller 120 before a cutting part with respect to the amount of slack of web W (W1) is carried out. Specifically, when the slack of the web W (W1) in the first buffer unit 170 is large, the rotation speed of the roller 120 in front of the cutting unit is increased and the slack is small when the slack is small. The rotational speed of the roller 120 in front of the cutting unit is made slower than when it is larger. The amount of sag of the web W (W1) in the first buffer unit 170 is set to a predetermined range, and the amount of sag is detected by the sag detector 180. The sag amount data detected by the sag detection unit 180 is transmitted to the control unit 2, and the control unit 2 drives and controls the pre-cutting unit roller 120 based on the sag amount data. Thereby, the deflection amount of the web W (W1) in the first buffer unit 170 is maintained within a predetermined range.

  On the other hand, if NO is determined in step S10, the process proceeds to step S20. Then, in step S20, it is determined whether or not it is from the time when the cutting unit 110 starts cutting the web W (W1) until the cutting unit 110 cuts the web W (W1). That is, it is determined whether the roller 120 before the cutting unit and the roller 125 after the cutting unit are simultaneously conveying the same continuous web W (W1). If YES, the process proceeds to step S21. If NO, the process proceeds to start. And in step S21, drive control of the roller 120 before a cutting part with respect to the rotational speed of the roller 125 after a cutting part is implemented. Specifically, the roller 120 before the cutting unit is rotated slower than the roller 125 after the cutting unit. As a result, tension is applied to the web W (W1) sandwiched between the pre-cut section roller 120 and the post-cut section roller 125, and the web W (W1) can be reliably cut. At this time, the rotational speed of the front roller 120 is not controlled according to the amount of sagging. If the rotation speed of the roller 120 before the cutting unit is controlled according to the amount of slack here, it is necessary to control the rotation speed of the roller 125 after the cutting unit in order to apply tension to the web W (W1), and the control is complicated. Become.

  Further, when the slack of the web W (W1) in the first buffer unit 170 is large, the rotation speed of the roller 120 before the cutting unit is increased within a range that does not become faster than the rotation speed of the roller 125 after the cutting unit. Thereby, the amount of sag of the web W (W1) is adjusted appropriately. In particular, after the web W (W1) is cut by the cutting portion 110, if the front cutting portion roller 120 is rotated faster than the rear cutting portion roller 125, the web W (W1) before cutting and after cutting There is a possibility that the web W (W2) overlaps to cause a conveyance failure. Furthermore, if the web W (W1) before cutting and the web W (W2) after cutting overlap, the tip detection unit 190 cannot accurately detect the tip of the web W (W1). . For this reason, the said conveyance failure can be prevented by making the rotation speed of the roller 120 before a cutting part slower than the rotation speed of the roller 125 after a cutting part.

  As mentioned above, according to the said embodiment, the following effects can be acquired.

  When the front cutting unit roller 120 and the rear cutting unit roller 125 are not simultaneously transporting the same continuous web W (W1), the front cutting unit roller 120 according to the slack of the web W (W1) before cutting. To control the rotation speed. Thereby, the sag of the web W (W1) is controlled within a predetermined range. On the other hand, when the front cutting section roller 120 and the rear cutting section roller 125 are simultaneously transporting the same continuous web W (W1), the front cutting section roller 120 is rotated more slowly than the rear cutting section roller 125. To control. Thereby, since it cut | disconnects in the state which gave tension | tensile_strength to web W (W1), web W (W1) can be cut | disconnected reliably. In other words, when tension is applied to the web W (W1) in order to cut the web W (W1), the rotational speed of the roller 120 in front of the cutting portion is variably controlled according to the slack, and the web W (W1). When no tension is applied, the rotation speed of the front roller 120 is not variably controlled according to the slack.

  In addition, the sheet | seat concerning this embodiment mainly says what used the fiber as the raw material and was made into the sheet form. However, the shape is not limited to that, and may be a board shape or a web shape (or a shape having irregularities). The raw material may be plant fibers such as cellulose, chemical fibers such as PET (polyethylene terephthalate) and polyester, and animal fibers such as wool and silk. In the present application, the sheet is divided into paper and non-woven fabric. The paper includes a mode in which pure pulp or waste paper is used as a raw material and is formed into a thin sheet, and includes recording paper for writing and printing, wallpaper, wrapping paper, colored paper, Kent paper, and the like. Nonwoven fabrics are thicker or lower in strength than paper and include nonwoven fabrics, fiber boards, tissue paper, kitchen paper, cleaners, filters, liquid absorbents, sound absorbers, cushioning materials, mats, and the like.

  The present invention is not limited to the above-described embodiment, and various modifications and improvements can be added to the above-described embodiment. A modification will be described below.

  (Modification 1) In the embodiment described above, the heating and pressing unit 150 is disposed on the downstream side of the cutting unit 110 that cuts the web W into a sheet shape, but the present invention is not limited to this. For example, the cutting unit 110 may be disposed on the downstream side of the heating and pressing unit 150. In this case, for example, the first buffer unit 170 and the sag detecting unit 180 are disposed on the downstream side of the heating and pressing unit 150, the cutting unit front roller 120 is disposed on the downstream side of the first buffer unit, and the cutting unit front roller 120 is disposed. The cutting unit 110 is disposed downstream of the cutting unit 110, the cutting unit rear roller 125 is disposed downstream of the cutting unit 110, and the tip detection unit 190 is disposed downstream of the cutting unit rear roller 125. Even if it does in this way, the same effect as the above can be acquired.

  (Modification 2) In the said embodiment, the supply part 10, the crushing part 20, the defibrating part 30, the classification part 40, and the additive injection | throwing-in part 60 may not be. If a raw material that has been defibrated and added with additives is used, these components are not necessary. Necessary components may be added according to the form of the raw material to be used.

  (Modification 3) In the present application, the used paper mainly refers to printed paper. However, if used as a raw material, it is regarded as used paper regardless of whether it is used.

  DESCRIPTION OF SYMBOLS 1 ... Sheet manufacturing apparatus, 10 ... Supply part, 20 ... Crushing part, 30 ... Defibration part, 40 ... Classification part, 50 ... Receiving part, 60 ... Additive input part, 70 ... Web formation part, 100 ... Conveyance part DESCRIPTION OF SYMBOLS 110 ... Cutting part, 120 ... Roller before cutting, 121 ... Roller, 125 ... Roller after cutting part, 126 ... Roller, 130 ... Post-cutting part, 140 ... Preheating pressurizing part as conveyance roller, 141 ... Roller, 150 DESCRIPTION OF SYMBOLS ... Heating and pressing part, 151 ... Heating and pressing roller, 160 ... Stacker, 180 ... Deflection detection part, 190 ... Tip detection part, Pu ... Waste paper, W, W1, W2 ... Web, Pr ... Sheet.

Claims (6)

A web forming section for forming a web on which at least fibers are deposited;
A cutting section for cutting the web;
A detection unit for detecting the slack of the web upstream of the cutting unit in the web conveyance direction;
A cutting unit front roller that conveys the web by a roller upstream of the cutting unit in the web conveyance direction;
A cutting unit rear roller that conveys the web by a roller downstream of the cutting unit in the web conveyance direction, and a sheet manufacturing apparatus comprising:
Between when the web is cut by the cutting section and before the web after the cutting section is started to be transported, before the cutting section, when the slack is larger than when the slack is small When the rotation speed of the roller is increased, the rotation speed of the roller in front of the cutting unit is slowed when the slack is small than when the slack is large, and the roller after the cutting unit starts to transport the cut web Until the said cutting part cut | disconnects the said web, it has a control part which rotates the said front roller of a cutting part late | slower than the said rear roller of a cutting part, The sheet manufacturing apparatus characterized by the above-mentioned. In the sheet manufacturing apparatus according to claim 1,
When the sag is large, the sheet manufacturing apparatus increases the rotation speed of the roller before the cutting section within a range not faster than the rotation speed of the roller after the cutting section. In the sheet manufacturing apparatus according to claim 1 or 2,
A sheet manufacturing apparatus using a one-way clutch in a drive transmission unit for rotating the cutting unit front roller. In the sheet manufacturing apparatus according to any one of claims 1 to 3,
A sheet manufacturing apparatus comprising a transport roller for transporting the web downstream of the post-cutting section roller in the web transport direction, wherein the transport roller rotates faster than the post-cutting section roller. In the sheet manufacturing apparatus according to claim 4,
The sheet manufacturing apparatus according to claim 1, wherein the sheet manufacturing apparatus does not include a detection unit that detects slack between the post-cutting unit roller and the conveyance roller. A web forming unit that forms a web on which at least fibers are deposited, a cutting unit that cuts the web, a detection unit that detects sagging of the web upstream of the cutting unit in the web conveyance direction, and the cutting A cutting unit front roller that conveys the web by a roller upstream of the process in the web conveyance direction, and a cutting unit rear roller that conveys the web by a roller downstream of the cutting unit in the web conveyance direction; A sheet manufacturing method in a sheet manufacturing apparatus comprising:
Between when the web is cut by the cutting section and before the web after the cutting section is started to be transported, before the cutting section, when the slack is larger than when the slack is small When the rotation speed of the roller is increased, the rotation speed of the roller in front of the cutting unit is slowed when the slack is small than when the slack is large, and the roller after the cutting unit starts to transport the cut web Until the cutting part cuts the web, the roller before the cutting part is rotated later than the roller after the cutting part.

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