JP6528821B2 - Sheet manufacturing equipment - Google Patents

Description

  The present invention relates to a sheet manufacturing apparatus.

  Conventionally, since waste paper discharged from the office includes waste paper in which confidential matters are described, it is desirable from the viewpoint of confidentiality that the waste paper can be processed in its own office. In a small-scale office, a wet sheet manufacturing apparatus that uses a large amount of water is not suitable, so a dry sheet manufacturing apparatus with a simplified structure has been proposed (see, for example, Patent Document 1).

JP, 2012-144819, A

  In the above-described sheet manufacturing apparatus, the fibers pass through the openings of the screen of the forming drum. In a forming drum corresponding to such a sieve portion, fibers may be caught on the way through the opening to block the opening and cause clogging. However, there is a problem that it can not be determined even if clogging occurs in the opening of the forming drum. In addition, there is a problem that the user can not recognize that the clogging has occurred.

  The present invention has been made to solve at least a part of the above-described problems, and can be realized as the following modes or application examples.

Application Example 1 A sheet manufacturing apparatus according to this application example includes a fibrillation unit that fibrillates a material containing fibers,
A sieve unit for passing includes a plurality of openings, said introduced the material opening material comprising the defibrated material formed by the defibrating unit passes,
A flow rate measuring unit provided between the sieve unit and the defibrating unit, which measures the flow rate of air flowing into the sieve unit together with the material when the material flows into the sieve unit;
And a control unit that determines that clogging of the sieve unit has occurred based on the flow rate of the air acquired by the flow rate measurement unit ,
Before SL control unit, when the flow rate of the air is not greater than a predetermined value, characterized by determining that the clogging of the sieve portion is generated.
Application Example 2 A sheet manufacturing apparatus according to this application example includes a plurality of openings, and a sieve unit which allows the introduced material to pass through the openings.
A belt for conveying while depositing the material passing through the opening;
A thickness measurement unit that measures the thickness of the material deposited on the belt;
A control unit that determines that clogging of the sieve unit has occurred based on outflow information on the flow rate of the material passing through the sieve unit;
The outflow information is the thickness of the material deposited on the belt,
The control unit is characterized in that when the thickness of the material deposited on the belt is smaller than a predetermined value, the control unit determines that clogging of the sieve unit has occurred.
Application Example 3 A sheet manufacturing apparatus according to this application example includes a plurality of openings, and a sieve unit which allows the introduced material to pass through the openings.
A belt for conveying while depositing the material passing through the opening;
A weight measuring unit for measuring the weight of the material deposited on the belt;
A control unit that determines that clogging of the sieve unit has occurred based on outflow information on the flow rate of the material passing through the sieve unit;
The spill information is the weight of the material deposited on the belt;
The controller is characterized in that when the weight of the material deposited on the belt is smaller than a predetermined value, the controller judges that clogging of the sieve has occurred.

  If clogging occurs in the sieve section, the material flowing into or out of the sieve section becomes resistant. Therefore, the flow rate of the material is reduced. According to this configuration, clogging of the sieve portion can be determined by acquiring information on the flow rate flowing into the sieve portion and information on the flow rate flowing out from the sieve portion.

Further, in the sheet manufacturing apparatus, the inflow information is a flow rate of air flowing into the sieve portion.

  The material flowing into the sieve section is transported by air flow. When clogging occurs in the sieve section, the flow rate of air flowing into the sieve section is also reduced. Therefore, the material flow rate is related to the air flow rate, and the air flow rate is the inflow information on the material flow rate. According to this configuration, the clogging of the sieve portion can be determined by the flow rate information of the air flowing into the sieve portion.

Further, in the sheet manufacturing apparatus, the inflow information is a flow rate of the material flowing into the sieve portion.

  If clogging occurs in the sieve section, the flow rate of the material flowing into the sieve section is reduced. According to this configuration, the clogging of the sieve portion can be determined by the flow rate information of the material flowing into the sieve portion.

Further, in the sheet manufacturing apparatus, the outflow information is a flow rate of air flowing out of the sieve portion.

  When clogging occurs in the sieve section, the flow rate of air flowing out of the sieve section is also reduced. Therefore, the flow rate of material is related to the flow rate of air, and the flow rate of air is the outflow information on the flow rate of material. According to this configuration, the clogging of the sieve portion can be determined by the flow rate information of the air flowing out of the sieve portion.

Further, in the sheet manufacturing apparatus, the outflow information is a thickness of the deposited material.

  When clogging occurs in the sieve section, the flow rate of the material flowing out of the sieve section is also reduced. As the material flowing out of the sieve section decreases, the thickness of the deposited material also decreases. According to this configuration, the clogging of the sieve portion can be determined by the thickness information of the deposited material.

Further, in the above-mentioned sheet manufacturing apparatus, the outflow information is a weight of deposited material.

  Reducing the thickness of the deposited material also reduces the weight of the material. According to this configuration, clogging of the sieve portion can be determined by the weight information of the deposited material.

Further, in the sheet manufacturing apparatus, the outflow information is a flow rate of the material which has flowed out of the sieve portion.

  According to this configuration, the clogging of the sieve portion can be determined by the flow rate information of the material flowing out of the sieve portion.

The sheet manufacturing apparatus may further include a suction unit for suctioning the material passing through the sieve unit, and the outflow information may be information on a load for driving the suction unit.

  When clogging occurs in the sieve unit, the driving load of the suction unit for sucking the material passing through the sieve unit is increased. According to this configuration, the clogging of the sieve unit can be determined by the information on the load for driving the suction unit.

Application Example 4 In the sheet manufacturing apparatus according to the application example described above, it is characterized in that the flow rate of the material flowing into the sieve portion is increased when it is determined that the clogging of the sieve portion occurs.

  According to this configuration, it is possible to compensate for the decrease in the flow rate of the material flowing into the sieve portion due to the occurrence of the clogging.

Application Example 5 In the sheet manufacturing apparatus according to the application example described above, when it is determined that clogging of the sieve section has occurred, the flow rate of the material flowing into the sieve section is the flow rate of the material before clogging occurs. It is characterized in that it is larger than the flow rate of the material flowing into the sieve portion.

  According to this configuration, the flow rate of the material flowing into the sieve portion is made larger than the flow rate of the material flowing into the sieve portion before clogging occurs, thereby eliminating at least a part of the clogging of the sieve portion be able to.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows the structure of the sheet manufacturing apparatus concerning 1st Embodiment. FIG. 5 is another schematic view showing the configuration of the sheet manufacturing apparatus according to the first embodiment. 3 is a flowchart showing a control method of the sheet manufacturing apparatus according to the first embodiment. Schematic which shows the structure of the sheet manufacturing apparatus concerning 2nd Embodiment. FIG. 10 is another schematic view showing the configuration of the sheet manufacturing apparatus according to the second embodiment. 6 is a flowchart showing a control method of the sheet manufacturing apparatus according to the second embodiment. Schematic which shows the structure of the sheet manufacturing apparatus concerning 3rd Embodiment. FIG. 13 is another schematic view showing the configuration of a sheet manufacturing apparatus according to a third embodiment. The flowchart which shows the control method of the sheet manufacturing apparatus concerning 3rd Embodiment. Schematic which shows the structure of the sheet manufacturing apparatus concerning 4th Embodiment. FIG. 13 is another schematic view showing the configuration of a sheet manufacturing apparatus according to a fourth embodiment. The flowchart which shows the control method of the sheet manufacturing apparatus concerning 4th Embodiment.

  Hereinafter, first to fourth 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 different from the actual scale in order to make each member or the like to be recognizable.

First Embodiment
First, the configuration of the sheet manufacturing apparatus according to the present embodiment will be described. The sheet manufacturing apparatus is based on, for example, a technology of regenerating raw materials (crushed materials) such as waste paper and pulp sheets into new sheets. Then, at least one of a sieve unit having a plurality of openings for passing the introduced material through the openings, inflow information on the flow rate of the material flowing into the sieve unit, and outflow information on the flow rate of the material passing through the sieve unit It has a function to detect that clogging of the sieve section has occurred when the flow rate is reduced based on the information. The raw material as a defibrillated material supplied to the sheet manufacturing apparatus according to the present embodiment is, for example, waste paper (raw material Pu) of A4 size, etc., which is currently mainstream in offices. The details will be described below.

  FIG. 1 is a schematic view showing the 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 45, an additive feeding unit 60, and a forming unit 70. And a water spray unit 120, a pressure unit 80, a heating and pressure unit 90, and a cutting unit 100. Furthermore, a flow rate measurement unit 110 as an information acquisition unit for acquiring inflow information is provided. The sheet manufacturing apparatus 1 is provided with a control unit (not shown) that controls these members.

  FIG. 2 is another schematic view showing the configuration of the sheet manufacturing apparatus according to the present embodiment. As shown in FIG. 2, the supply unit 10 supplies a raw material as a defibrated material to the crushing unit 20. The supply unit 10 includes, for example, a tray 11 on which a plurality of raw materials Pu are stacked and placed, and an automatic feeding mechanism 12 or the like that can continuously feed the raw materials Pu placed on the tray 11 into the crushing unit 20. There is.

  The crushing unit 20 is for cutting the supplied raw material Pu into pieces of several centimeters square. The crushing unit 20 is provided with a crushing blade 21 so as to constitute an apparatus in which the cutting width of a normal shredder blade is expanded. Thereby, the supplied raw material Pu can be easily cut into pieces. Then, the small pieces are supplied to the defibrating unit 30 through the upstream conveyance path 201.

  The defibrating unit 30 includes a rotating rotary blade, and disaggregates the small pieces supplied from the crushing unit 20 into a fibrous shape (cotton shape). The defibrating unit 30 of the present embodiment is a dry-type disintegration in which disintegration is performed in air instead of in water. For example, a disk disintegrator, a turbo mill (manufactured by Turbo Kogyo Co., Ltd.), a selenium mirror (manufactured by Masuko Sangyo Co., Ltd.), or a dry fibrillation apparatus equipped with a wind generating mechanism can be appropriately applied to the disintegrating unit 30. The size of the pieces to be fed to such a dry type defibrating unit 30 may be the same size as that discharged by a normal shredder. By the defibrating treatment of the defibrating unit 30, the printed ink, toner, coating material to the raw material such as anti-smearing material, etc. are released from adhering to the fibers (hereinafter, these are referred to as "ink particles") . Therefore, the defibrated material discharged from the defibrating unit 30 is fibers and ink particles obtained by the defibration of the small pieces.

  The classification unit 40 classifies the transported defibrated material into ink particles and fibers, and removes the ink particles. The cyclone 40 is applied as the classification part 40 of this embodiment. The cyclone 40 is desirable because a tangential input type cyclone is a relatively simple structure. In addition, it may replace with the cyclone 40 and may use another kind of pneumatic classifier. In this case, for example, an elbow jet, an eddy classifier, or the like is used as an air flow classifier other than the cyclone 40. The air flow type classifier generates swirling air flow and separates and classifies according to the difference in centrifugal force received by the size and density of the defibrated material, and the classification point can be adjusted by adjusting the air flow velocity and centrifugal force. .

  The cyclone 40 according to the present embodiment includes an inlet 41 through which a defibrated material is introduced from the defibrating unit 30, a cylindrical portion 43 with the inlet 41 in a tangential direction, a conical portion 42 continuing to the cylindrical portion 43, and a conical portion A lower outlet 46 provided at the lower portion of the lower portion and an upper exhaust port 44 provided at the upper center of the cylindrical portion 43 for discharging fine powder.

  In the classification process, the air flow loaded with the defibrated material introduced from the introduction port 41 of the cyclone 40 is changed to a circumferential movement in the cylindrical portion 43 and moves to the conical portion 42. Then, they are separated and classified according to the difference in centrifugal force received by the size and density of the defibrated material. When what is contained in the defibrated material is classified into two, fibers and ink particles other than fibers, fibers are larger or denser than ink particles. Therefore, the defibrated material is separated by classification processing into ink particles which are smaller than the fibers and have a low density, and fibers which are larger than the ink particles and have a high density. The separated ink particles are drawn to the upper exhaust port 44 as fine powder together with air. Then, relatively small and low density ink particles are discharged from the upper exhaust port 44 of the cyclone 40. Then, the discharged ink particles are collected from the upper exhaust port 44 of the cyclone 40 through the pipe 203 to the receiving portion 45. On the other hand, fibers having a density larger than that of the ink particles are conveyed as disintegrated fibers from the lower outlet of the cyclone 40 toward the forming unit 70.

  In the middle of the piping 204 in which the defibrated fibers are transported from the cyclone 40 to the forming unit 70, an additive feeding unit 60 for adding an additive to the disintegrated fibers is provided. As an additive, a fusion | melting resin, a flame retardant, a whiteness improvement agent, a paper strengthening agent, a sizing agent etc. are mentioned, for example. Note that some or all of these additives may be omitted, and further other additives may be added. The additive is stored in the storage section 61 and is input from the input port 62 by an input mechanism (not shown).

Furthermore, the piping 204 for conveying material fibers disposed between the cyclone 40 and the forming unit 70 obtains inflow information on the flow rate of the material fibers (material) flowing from the cyclone 40 into the forming drum 71 of the forming unit 70. An information acquisition unit is provided. In the present embodiment, as the information acquisition unit, the flow amount measurement unit 110 is provided to acquire the flow amount of air flowing into the forming drum 71 as inflow information by measuring the flow amount of air flowing inside the pipe 204.
The flow rate measurement unit 110 can apply, for example, a flow rate sensor capable of detecting the flow of fluid, such as a Venturi gauge, an orifice scale, a pitot tube, a triangle pipe, and an ultrasonic flowmeter. Then, the measured air flow rate is configured to be transmitted to the control unit.

A sheet (web W) is formed using a mixture of defibrated fibers and an additive. Then, what the fusion | melting resin and the additive were mixed with the disintegration fiber is called material fiber.
The forming section 70 deposits material fibers to a uniform thickness, and has a mechanism for uniformly dispersing the material fibers in air and a mechanism for sucking the dispersed material fibers onto the mesh belt 73. . The forming unit 70 is provided with a screen having a plurality of openings, and a forming drum 71 as a sieve unit for depositing material fibers having passed through the openings on the mesh belt 73.

  First, as a mechanism for uniformly dispersing the material fibers in the air, a forming drum 71 into which the material fibers are introduced is disposed in the forming unit 70. By rotating the forming drum 71, the additive can be uniformly mixed in the fiber. An opening is provided on the surface of the forming drum 71. By driving the forming drum 71 to rotate and passing the material fibers through the openings, the material fibers can be uniformly dispersed in the air.

  On the other hand, an endless mesh belt 73 on which a mesh is formed is provided vertically below the forming drum 71. The mesh belt 73 is stretched by a plurality of stretching rollers 72, and is moved in one direction by rotation of at least one of the stretching rollers 72.

  Further, a suction device 75 for generating an air flow directed vertically downward via the mesh belt 73 is provided vertically below the forming drum 71. The suction device 75 can suck material fibers dispersed in the air onto the mesh belt 73.

When the material fiber is introduced into the forming drum 71 of the forming unit 70, the material fiber passes through the opening of the surface of the forming drum 71 and is 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 deposit material fibers with a uniform thickness. A deposit including material fibers deposited in this manner is referred to as a web W. The mesh belt may be metallic, resin or non-woven, and any material may be used as long as material fibers can be deposited and air can pass through. In addition, when the hole diameter of the mesh is too large, the surface when the sheet is formed becomes uneven, and when the hole diameter of the mesh is too small, it is difficult to form a stable air flow by the suction device 75. For this reason, it is preferable to adjust the hole diameter of the mesh appropriately.
The suction device 75 can be formed by forming a closed box in which a window of a desired size is opened under the mesh belt 73 and sucking air from other than the window to decompress the inside of the box.

  The web W is transported in the web transport direction indicated by the arrow in FIG. 2 by moving the mesh belt 73. The water spray unit 120 sprays and adds water toward the web W to be conveyed. This can enhance hydrogen bonding between fibers. Then, the web W sprayed with the water is conveyed to the pressure unit 80.

The pressure unit 80 applies pressure to the conveyed web W. The pressure unit 80 includes two pairs of pressure rollers 81. The web W is compressed by passing the water-sprayed web W between opposed pressure rollers 81. Then, the compressed web W is conveyed to the heating and pressing unit 90.
The heating and pressurizing unit 90 simultaneously applies pressure and heating to the conveyed web W. The heating and pressing unit 90 includes two pairs of heating rollers 91. The compressed web W is heated and pressurized by passing between the opposed heating rollers 91.

  In a state where the fiber interval is shortened by the pressure roller 81 and the contact point between the fibers is increased, the fusion resin is melted by the heating roller 91 to bind the fibers to the fibers. Thereby, the strength as a sheet can be improved, and an excellent sheet can be produced by drying excess water. In addition, it is desirable that heating be performed simultaneously on the web W by installing a heater in the heating roller 91. Under the pressure roller 81 and the heating roller 91, a guide 108 for guiding the web W is disposed.

  The web W obtained as described above is conveyed to the cutting unit 100. The cutting unit 100 includes a cutter 101 for cutting in the transport direction and a cutter 102 for cutting in the direction orthogonal to the transport direction, and cuts the web W formed in a long shape into a desired size. The cut web W is stacked on the stacker 160 as a sheet Pr.

  Next, a control method of the sheet manufacturing apparatus will be described. FIG. 3 is a flowchart showing the control method of the first embodiment. Specifically, a control method for detecting clogging of the forming drum 71 in accordance with the air flow rate acquired by the flow rate measurement unit 110 will be described.

  First, the flow rate measuring unit 110 measures the flow rate of air flowing from the cyclone 40 in the pipe 204 to the forming unit 70 (step S1). The measured air flow rate data is acquired by the control unit.

Next, the control unit determines whether the value of the acquired air flow rate data is larger than a predetermined value (step S2). If the value of the acquired air flow rate data is larger than the predetermined value (step S2: YES), the control unit determines that clogging does not occur in the opening of the forming drum 71 (step S3).
Alternatively, when the value of the acquired air flow rate data is not larger than the predetermined value (step S2: NO), the control unit determines that the opening of the forming drum 71 is clogged (step S4).

  Then, if it is determined (detected) that clogging has occurred in the opening of the forming drum 71, an alarm is issued, for example, using an alarm output unit, and the operator is notified of the occurrence of clogging of the forming drum 71. When it is determined (detected) that clogging has occurred in the opening of the forming drum 71, display is performed using the display means together with or instead of the alarm output means, and the operator of the forming drum 71 is The occurrence of clogging may be notified. If it is determined that no clogging has occurred, no alarm is issued.

  In order to convey the material fibers to the forming drum 71, the material fibers are conveyed by a flow of air using an air flow from a blower or a cyclone 40 (not shown). The air flow enters the forming drum 71 and passes through the opening. Here, when clogging occurs in the opening of the forming drum 71, the flow rate of air flowing to the forming drum 71 becomes smaller because there is resistance to the flow of air than in the case where no clogging occurs. Therefore, when the air flow rate flowing to the forming drum 71 is smaller than a predetermined value, it can be determined that clogging has occurred.

As mentioned above, according to the said embodiment, the following effects can be acquired.
By measuring the flow rate of air flowing from the cyclone 40 to the forming unit 70 in the flow rate measurement unit 110, it can be determined whether clogging of the forming drum 71 has occurred based on the measured air flow rate.

Second Embodiment
Next, a second embodiment will be described. 4 and 5 are schematic views showing the configuration of the sheet manufacturing apparatus according to the present embodiment. As shown in FIGS. 4 and 5, the sheet manufacturing apparatus 1a includes the feeding unit 10, the crushing unit 20, the defibrating unit 30, the classification unit 40, the receiving unit 45, the additive feeding unit 60, and the like. A portion 70, a water spray portion 120, a pressure portion 80, a heating and pressure portion 90, and a cutting portion 100 are provided. Furthermore, the flow rate measurement unit 110 as an information acquisition unit that acquires outflow information is provided. The sheet manufacturing apparatus 1a includes a control unit (not shown) that controls these members.

  The flow rate measurement unit 110 of the present embodiment is installed inside an exhaust pipe 76 that exhausts the air sucked by the suction device 75 of the forming unit 70 to the outside of the sheet manufacturing apparatus 1 a. The flow rate measuring unit 110 measures the flow rate of the air discharged from the forming unit 70 as the outflow information. The other configuration is the same as that of the first embodiment, and hence the description is omitted.

  Next, a control method of the sheet manufacturing apparatus will be described. FIG. 6 is a flowchart showing a control method of the second embodiment. Specifically, a control method for detecting clogging of the forming drum 71 in accordance with the air flow rate acquired by the flow rate measurement unit 110 will be described.

  First, the flow rate measuring unit 110 measures the flow rate of air exhausted from the suction device 75 of the forming unit 70 (step S11). The measured air flow rate data is acquired by the control unit.

Next, the control unit determines whether the value of the acquired air flow rate data is larger than a predetermined value (step S2). If the value of the acquired air flow rate data is larger than the predetermined value (step S2: YES), the control unit determines that clogging does not occur in the opening of the forming drum 71 (step S3).
Alternatively, when the value of the acquired air flow rate data is not larger than the predetermined value (step S2: NO), the control unit determines that the opening of the forming drum 71 is clogged (step S4).

  Then, if it is determined (detected) that clogging has occurred in the opening of the forming drum 71, an alarm is issued, for example, using an alarm output unit, and the operator is notified of the occurrence of clogging of the forming drum 71. When it is determined (detected) that clogging has occurred in the opening of the forming drum 71, display is performed using the display means together with or instead of the alarm output means, and the operator of the forming drum 71 is The occurrence of clogging may be notified. If it is determined that no clogging has occurred, no alarm is issued.

  When suction is performed by the suction device 75, a suction force also acts on the forming drum 71. Here, when clogging occurs in the opening of the forming drum 71, the flow rate of air drawn from the forming drum 71 becomes smaller because the air flow is more resistant than in the case where no clogging occurs. Therefore, when the flow rate of air sucked by the suction device 75 is smaller than a predetermined value, it can be determined that clogging has occurred.

As mentioned above, according to the said embodiment, the following effects can be acquired.
By measuring the flow rate of the air exhausted from the suction device 75 of the forming unit 70 by the flow rate measuring unit 110, it can be determined based on the measured air flow rate whether clogging of the forming drum 71 has occurred.

Third Embodiment
Next, a third embodiment will be described. 7 and 8 are schematic views showing the configuration of the sheet manufacturing apparatus according to the present embodiment. As shown in FIGS. 7 and 8, the sheet manufacturing apparatus 1 b includes the supply unit 10, the crushing unit 20, the defibrating unit 30, the classification unit 40, the receiving unit 45, the additive feeding unit 60, and A portion 70, a water spray portion 120, a pressure portion 80, a heating and pressure portion 90, and a cutting portion 100 are provided. Furthermore, a torque amount measuring unit 111 as an information acquisition unit for acquiring outflow information is provided. The sheet manufacturing apparatus 1 b includes a control unit (not shown) that controls these members.

The torque amount measuring unit 111 of the present embodiment measures the current value for driving the suction device 75 of the forming unit 70 or the torque value applied to the suction device 75 as the outflow information. The suction device 75 of this embodiment includes a suction fan 77 for sucking air and a suction fan drive unit 78 for driving the suction fan 77. Therefore, the load on the suction fan drive unit 78 changes according to the state of the air to be sucked.
That is, when the forming drum 71 is clogged, the flow rate of the air for conveying the material decreases, and thus the load on the suction fan drive unit 78 increases. Therefore, the suction fan drive unit 78 needs more current, and the torque value applied to the suction fan 77 increases. Therefore, based on the measurement data by the torque amount measurement unit 111, it is possible to determine whether or not clogging of the forming drum 71 has occurred.

  The other configuration of the sheet manufacturing apparatus 1b is the same as that of the first embodiment, and thus the description thereof is omitted.

  Next, a control method of the sheet manufacturing apparatus will be described. FIG. 9 is a flowchart showing the control method of the third embodiment. Specifically, a control method for detecting clogging of the forming drum 71 in accordance with the air flow rate acquired by the torque amount measurement unit 111 will be described.

  First, the torque amount measuring unit 111 measures the torque value applied to the suction device of the forming unit 70 (step S21). The measured torque value is acquired by the control unit.

Next, the control unit determines whether the acquired torque value is larger than a predetermined value (step S22). When the acquired torque value is larger than the predetermined value (step S22: YES), the control unit determines that the opening of the forming drum 71 is clogged (step S4).
Alternatively, when the acquired torque value is not larger than the predetermined value (step S22: NO), the control unit determines that the opening of the forming drum 71 is not clogged (step S3).

  Then, when it is determined that clogging has occurred in the opening of the forming drum 71, an alarm is issued, for example, using alarm output means, and the operator is notified of the occurrence of clogging of the forming drum 71. When it is determined (detected) that clogging has occurred in the opening of the forming drum 71, display is performed using the display means together with or instead of the alarm output means, and the operator of the forming drum 71 is The occurrence of clogging may be notified. If it is determined that no clogging has occurred, no alarm is issued.

As mentioned above, according to the said embodiment, the following effects can be acquired.
By measuring the torque value applied to the suction device 75 of the forming unit 70 by the torque amount measuring unit 111, it can be determined based on the measured torque value whether clogging of the forming drum 71 has occurred.

Fourth Embodiment
Next, a fourth embodiment will be described. 10 and 11 are schematic views showing the configuration of the sheet manufacturing apparatus according to the present embodiment. As shown in FIGS. 10 and 11, the sheet manufacturing apparatus 1c includes the supply unit 10, the crushing unit 20, the defibrating unit 30, the classification unit 40, the receiving unit 45, the additive introduction unit 60, and the like. A portion 70, a water spray portion 120, a pressure portion 80, a heating and pressure portion 90, and a cutting portion 100 are provided. Furthermore, the thickness measurement part 112 as an information acquisition part which acquires outflow information is provided. The sheet manufacturing apparatus 1 c includes a control unit (not shown) that controls these members.

  In the present embodiment, the thickness measurement unit 112 is provided to measure the deposition thickness of the material fiber as the material deposited on the mesh belt in the forming unit 70 as the outflow information. The thickness measurement unit 112 can apply various sensors such as an optical sensor, an ultrasonic sensor, and a mechanical sensor. For example, when the forming drum 71 is clogged, it is conceivable that the air flow rate for transporting the material fibers is reduced, and the thickness of the deposit deposited in the forming unit 70 is reduced. For this reason, it is possible to determine the presence or absence of clogging of the forming drum 71 based on measurement data by the thickness measurement unit 112.

  The other configuration of the sheet manufacturing apparatus 1c is the same as that of the first embodiment, and thus the description thereof is omitted.

  Next, a control method of the sheet manufacturing apparatus will be described. FIG. 12 is a flowchart showing the control method of the fourth embodiment. Specifically, a control method for detecting clogging of the forming drum 71 in accordance with the thickness data of the deposit acquired by the thickness measurement unit 112 will be described.

  First, the thickness measurement unit 112 measures the deposition thickness of material fibers in the forming unit 70 (step S31). The measured thickness data is acquired by the control unit.

Next, the control unit determines whether the value of the acquired deposition thickness is smaller than a predetermined value (step S32). If the value of the acquired deposition thickness is smaller than the predetermined value (step S32: YES), the control unit determines that clogging of the opening of the forming drum 71 has occurred (step S4).
Alternatively, when the value of the acquired deposition thickness is not smaller than the predetermined value (step S32: NO), the control unit determines that clogging of the opening of the forming drum 71 does not occur (step S3). .

  Then, if it is determined (detected) that clogging has occurred in the opening of the forming drum 71, an alarm is issued, for example, using an alarm output unit, and the operator is notified of the occurrence of clogging of the forming drum 71. When it is determined (detected) that clogging has occurred in the opening of the forming drum 71, display is performed using the display means together with or instead of the alarm output means, and the operator of the forming drum 71 is The occurrence of clogging may be notified. If it is determined that no clogging has occurred, no alarm is issued.

As mentioned above, according to the said embodiment, the following effects can be acquired.
By measuring the deposition thickness of the material fibers in the forming unit 70 by the thickness measuring unit 112, it can be determined whether clogging of the forming drum 71 has occurred based on the measured deposition thickness data.

  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 is described below.

  Although the air flow rate is measured as the inflow information using the flow rate measurement unit 110 in the first embodiment, the present invention is not limited to this configuration. For example, the flow rate of material fibers may be used as the material flowing into the forming drum 71 as inflow information. Even in this case, the same effect as the above effect can be obtained.

  In the second embodiment, the air flow rate is measured as the outflow information using the flow rate measurement unit 110, but the present invention is not limited to this configuration. For example, the flow rate of the material fiber may be used as the material flowing out of the forming drum 71 as the outflow information. Even in this case, the same effect as the above effect can be obtained.

  In the fourth embodiment, the deposition thickness of the material fibers is measured as the outflow information using the thickness measurement unit 112, but the present invention is not limited to this configuration. For example, it may be the weight of material fibers deposited as outflow information. Even in this case, the same effect as the above effect can be obtained.

  The sheet according to the present embodiment mainly refers to a sheet made of vegetable fiber such as cellulose as a raw material. However, the shape is not limited to such, and may be a board shape, a web shape, or a shape having unevenness. Further, as a raw material, plastic fibers such as PET (polyethylene terephthalate) or animal fibers such as wool may be used. That is, it includes fibers that require a fiber as a raw material to improve the whiteness. Specifically, sheet materials such as paper made from pure pulp and made into sheet form, recycled paper made from used paper, nonwoven fabric, fiber board, tissue paper, kitchen paper, cleaner, filter, liquid absorbent material, Includes sound absorbers, shock absorbers, mats, etc.

  The clogging of the opening of the forming drum 71 does not affect the flow rate or the thickness of the deposition even if one or two of the plurality of openings are clogged. Therefore, the occurrence of clogging in the sieve portion means the case where the clogging is performed to such an extent that the flow rate and the thickness of the deposit are affected. For example, 20 to 50% of the plurality of openings may be clogged. The timing of the judgment of clogging is periodically performed at the start of sheet manufacturing or at the time of sheet manufacturing. In addition, although it may be determined once that clogging has occurred, an alarm may be issued, but since measurement of flow rate and thickness of deposition has large variations, an alarm is issued when it is determined that clogging has occurred a plurality of times. May be

  If it is determined that clogging has occurred, control may be performed to remove the clogging. For example, air (compressed air) having a flow rate larger than the flow rate of the air for transporting the material fibers before clogging occurs is fed into the forming drum 71. Thus, the clogging can be removed by forcibly pushing out the fibers and the like clogged in the opening. This is more effective by sending compressed air.

  If it is determined that clogging has occurred, the flow rate of the material or air flowing into the forming drum 71 may be increased. This can be achieved by increasing the suction force of the suction device 75. For example, when a blower is provided between the additive input portion 60 and the forming portion 70, the flow rate of the material or air can also be increased by increasing the flow rate of the blower for feeding the material fiber to the forming drum 71. Thereby, the opening of the forming drum 71 is clogged, and the flow rate of the material or the air can compensate for the decrease.

  1, 1a, 1b, 1c: sheet manufacturing apparatus, 10: feeding portion, 20: crushing portion, 30: defibrating portion, 40: classification portion (cyclone), 45: receiving portion, 70: forming portion, 71: forming Drum, 120: Water spray unit, 90: Heating and pressing unit, 80: Pressing unit, 100: Cutting unit, 110: Flow rate measuring unit, 111: Torque amount measuring unit, 112: Thickness measuring unit, 60: Additive addition Department.

Claims (5)

A fibrillation unit for fibrillating a material containing fibers,
A sieve unit for passing includes a plurality of openings, said introduced the material opening material comprising the defibrated material formed by the defibrating unit passes,
A flow rate measuring unit provided between the sieve unit and the defibrating unit, which measures the flow rate of air flowing into the sieve unit together with the material when the material flows into the sieve unit;
And a control unit that determines that clogging of the sieve unit has occurred based on the flow rate of the air acquired by the flow rate measurement unit ,
Before SL control unit, when the flow rate of the air is not greater than the predetermined value, the sheet manufacturing apparatus characterized by determining that the clogging of the sieve portion is generated.   A sieve portion having a plurality of openings and passing the introduced material through the openings;
  A belt for conveying while depositing the material passing through the opening;
  A thickness measurement unit that measures the thickness of the material deposited on the belt;
  A control unit that determines that clogging of the sieve unit has occurred based on outflow information on the flow rate of the material passing through the sieve unit;
  The outflow information is the thickness of the material deposited on the belt,
  The said control part judges that clogging of the said sieve part generate | occur | produced, when the thickness of the said material deposited on the said belt is smaller than predetermined value.   A sieve portion having a plurality of openings and passing the introduced material through the openings;
  A belt for conveying while depositing the material passing through the opening;
  A weight measuring unit for measuring the weight of the material deposited on the belt;
  A control unit that determines that clogging of the sieve unit has occurred based on outflow information on the flow rate of the material passing through the sieve unit;
  The spill information is the weight of the material deposited on the belt;
  The said control part judges that clogging of the said sieve part generate | occur | produced, when the weight of the said material deposited on the said belt is smaller than a predetermined value. The sheet manufacturing apparatus according to any one of claims 1 to 3 .
A sheet manufacturing apparatus characterized in that the flow rate of the material flowing into the sieve unit is increased when it is determined that clogging of the sieve unit has occurred. In the sheet manufacturing apparatus according to any one of claims 1 to 4 ,
The flow rate of the material flowing into the sieve portion is made larger than the flow rate of the material flowing into the sieve portion before the clogging occurs when it is determined that the clogging of the sieve portion occurs. Sheet manufacturing equipment.

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