JP2016169448A - Sheet production apparatus and sheet production method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress decline in productivity by heating efficiently in a sheet production apparatus.SOLUTION: The sheet production apparatus comprises: a deposition part configured to deposit a material including fibers; a conveyance part configured to convey a deposit deposited by the deposition part; a forming part configured to form a sheet by heating the deposit conveyed by the conveyance part without contact; and a temperature detection part configured to detect a temperature of the sheet. The conveyance part changes a speed of conveying the deposit based on a temperature of the sheet detected by the temperature detection part.SELECTED DRAWING: Figure 1

Description

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

  Conventionally, a method of manufacturing a nonwoven fabric by subjecting a material containing fibers to heat treatment by irradiation with far infrared rays is known (for example, see Patent Document 1).

JP-A-7-90762

  However, when changing the heating temperature of the far-infrared irradiation device in order to perform the heat treatment at a temperature suitable for the state of the material containing the fiber, it takes time until the temperature in the far-infrared irradiation device becomes constant, such as a nonwoven fabric. There was a problem that the productivity of the sheet was lowered.

  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 deposition unit that deposits a material containing fibers, a conveyance unit that conveys deposits deposited by the deposition unit, and the deposition that is conveyed by the conveyance unit. A molding unit configured to form a sheet by heating an object in a non-contact manner, and a temperature detection unit configured to detect the temperature of the sheet, and the conveyance unit is configured to detect the temperature of the sheet detected by the temperature detection unit. Based on the above, the transport speed of the deposit is changed.

  According to this configuration, the deposited deposit is transported by the transport unit and heated by the molding unit. Here, the conveyance speed of the deposit is configured to be changeable based on the temperature of the sheet. Therefore, by changing the deposit conveyance speed while keeping the heating temperature in the molding section constant, it is possible to suppress a decrease in productivity and to heat the deposit with a necessary heating amount.

  Application Example 2 The sheet manufacturing apparatus according to the application example includes a control unit that changes the supply amount of the material supplied to the deposition unit based on the temperature of the sheet detected by the temperature detection unit. The transfer unit changes the transfer rate of the deposit according to the supply amount of the material supplied to the deposition unit.

  According to this configuration, the supply amount of the material supplied to the deposition unit is changed based on the temperature of the sheet. And the conveyance speed of a deposit is changed according to the supply amount of a material. For example, when the amount of supplied material is small, the conveyance speed is slow compared to when the amount of supplied material is large, and when the amount of supplied material is large, the amount of supplied material is small Compared to, increase the transport speed. Thereby, the thickness of a deposit is kept constant and a sheet | seat with uniform thickness can be manufactured.

  Application Example 3 In the sheet manufacturing apparatus according to the application example, the sheet manufacturing apparatus includes a supply unit that supplies a raw material including fibers, and a defibrating unit that defibrates the raw material, and the material is the defibrating unit. It includes at least a part of the defibrated material, and the control unit changes a supply amount of the raw material by the supply unit.

  According to this configuration, the supply amount of the material supplied to the deposition unit can be easily changed by changing the supply amount of the used paper as the raw material from the supply unit.

  Application Example 4 In the sheet manufacturing apparatus according to the application example, the stacking unit includes a rotating sieve, and the rotation speed of the sieve is changed based on the temperature of the sheet detected by the temperature detection unit. And a transport unit that changes a transport speed of the deposit according to a rotation speed of the sieve.

  According to this configuration, the rotational speed of the sieve is changed based on the temperature of the sheet. And according to the rotational speed of a sieve, the conveyance speed of a deposit is changed. For example, when the rotational speed of the sieve is slow, the transport speed is made slower than when the rotational speed of the sieve is fast, and when the rotational speed of the sieve is fast, the transport speed is made faster than when the rotational speed of the sieve is slow. Thereby, the thickness of a deposit is kept constant and a sheet | seat with uniform thickness can be manufactured.

  [Application Example 5] In the sheet manufacturing method according to this application example, a material containing fibers is deposited, the deposited deposit is conveyed, the conveyed deposit is heated in a non-contact manner, and a sheet is formed. The temperature of the sheet is detected, and the transport speed of the deposit is changed based on the detected temperature of the sheet.

  According to this configuration, it is possible to suppress a decrease in productivity by heating the deposit with a necessary heating amount by changing the conveyance speed of the deposit while maintaining the heating temperature constant.

Schematic which shows the structure of the sheet manufacturing apparatus concerning 1st Embodiment. The flowchart which shows the control method of the sheet manufacturing apparatus concerning 1st Embodiment. The flowchart which shows the control method of the sheet manufacturing apparatus concerning 2nd Embodiment.

  Hereinafter, first and second 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 embodiment)
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 heats the deposit transported by the transport unit in a non-contact manner, a deposition unit that deposits a material containing fibers, a transport unit that transports the deposit deposited by the deposition unit, and A sheet forming unit configured to form a sheet; and a temperature detection unit configured to detect the temperature of the sheet, and the conveyance unit changes the conveyance speed of the deposit based on the temperature of the sheet detected by the temperature detection unit. It is. The sheet manufacturing method according to the present embodiment deposits a material containing fibers, conveys the deposited deposit, heats the conveyed deposit in a non-contact manner, forms the sheet, and detects the temperature of the sheet. Then, the transport speed of the deposit is changed based on the detected sheet temperature. 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 of the present embodiment includes a supply unit 10, a crushing unit 20, a defibrating unit 30, a classification unit 40, a sorting unit 50, and an additive charging unit 60. , A deposition unit 70, a transport unit 180, a molding unit 90, a temperature detection unit 190, and the like. Moreover, the control part 2 which controls these members is provided.

  The supply unit 10 supplies waste paper Pu or the like as a raw material containing fibers 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 defibrates waste paper Pu as a raw material containing fibers in the air. Specifically, the defibrating unit 30 includes a rotating blade (not shown) that rotates, and performs defibrating to loosen the crushed paper supplied from the crushing unit 20 into fibers. In this application, what is defibrated by the defibrating unit 30 is referred to as a defibrated material, and what has passed through the defibrating unit 30 is referred to as a defibrated material. In addition, the defibrating unit 30 of the present embodiment performs defibrating in a dry manner in the air. As a result of the defibrating process of the defibrating unit 30, the printed ink, toner, and the material applied to the paper such as the anti-bleeding material become fibers of several tens of μm or less (hereinafter referred to as “ink particles”). And separate. Therefore, the defibrated material that comes out from the defibrating unit 30 is fibers and ink particles obtained by defibrating a piece of paper. The airflow is generated by the rotation of the rotary blade, and the fibers defibrated via the pipe 202 are carried on the airflow and conveyed to the classification unit 40 in the air. In addition, you may provide separately the airflow generator which produces | generates the airflow for conveying the fiber disentangled in the defibrating part 30 via the piping 202 to the classification part 40 as needed.

  The classifying unit 40 classifies the introduced material by airflow. In this embodiment, the defibrated material as the introduced material is classified into ink particles and fibers. The classifying unit 40 can classify the conveyed defibrated material into ink particles and fibers by applying a cyclone, for example. Note that other types of airflow classifiers may be used instead of the cyclone. In this case, as an airflow classifier other than the cyclone, for example, an elbow jet or an eddy classifier 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 can be divided into relatively small and low density ink particles and fibers larger than the ink particles and high density.

  The classifying unit 40 of the present embodiment is a tangential input type cyclone, and includes an introduction port 40a into which an introduced material is introduced from the defibrating unit 30, a cylinder portion 41 with the introduction port 40a attached in a tangential direction, and a lower portion of the cylinder portion 41. The conical part 42 that follows, the lower outlet 40b provided at the lower part of the conical part 42, and the upper exhaust port 40c for discharging fine powder provided at the upper center of the cylindrical part 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 classification unit 40 is changed into a circumferential motion by the cylindrical part 41 and the conical part 42, and is subjected to centrifugal force and classified. Then, the fibers larger than the ink particles and having a high density move to the lower outlet 40b, and the relatively small and low density ink particles are led to the upper exhaust port 40c as fine powder together with air. Then, ink particles are discharged from the upper exhaust port 40 c of the classification unit 40. Then, the discharged ink particles are collected in the receiving unit 80 via the pipe 206 connected to the upper exhaust port 40c of the classifying unit 40. On the other hand, a classified product containing fibers classified through the pipe 203 from the lower outlet 40b of the classifying unit 40 is conveyed toward the sorting unit 50 in the air. From the classification unit 40 to the sorting unit 50, it may be transported by an air current when it is classified, or may be transported from the classification unit 40 located above to the sorting unit 50 located below by gravity. Note that a suction part or the like for efficiently sucking the short fiber mixture from the upper exhaust port 40c may be disposed in the upper exhaust port 40c, the pipe 206, or the like of the classification unit 40. Classification is not exactly divided at a certain size or density. Further, it is not exactly divided into fibers and ink particles. Among the fibers, relatively short fibers are discharged from the upper exhaust port 40c together with the ink particles. A relatively large ink particle is discharged from the lower outlet 40b together with the fiber.

  The sorting unit 50 sorts the classified product (defibrated material) including the fibers classified by the classifying unit 40 through the sieve unit 51 having a plurality of openings. More specifically, the classified product including the fibers classified by the classifying unit 40 is sorted into a passing material that passes through the opening and a residue that does not pass through the opening. The sorting unit 50 according to the present embodiment includes a mechanism for dispersing the classified material in the air by rotational movement. Then, the passing material that has passed through the opening by sorting by the sorting unit 50 is transported from the passing material transport unit 52 to the deposition unit 70 side via the pipe 204. On the other hand, the residue that has not passed through the opening due to the sorting by the sorting unit 50 is returned to the defibrating unit 30 again as the defibrated material via the pipe 205. Thereby, the residue is reused (reused) without being discarded.

  The passing material that has passed through the opening by sorting by the sorting unit 50 is conveyed in the air to the deposition unit 70 via the pipe 204. The sorting unit 50 may be transported from the sorting unit 50 to the deposition unit 70 by a blower (not shown) that generates an air flow, or may be transported by gravity from the sorting unit 50 located above to the deposition unit 70 located below. Between the sorting unit 50 and the deposition unit 70 in the pipe 204, an additive feeding unit for adding an additive such as a binder resin (for example, a thermoplastic resin or a thermosetting resin) to the passing material to be conveyed. 60 is provided. In addition to the binder resin, for example, a flame retardant, a whiteness improver, a sheet strength enhancer, a sizing agent, an absorption modifier, a fragrance, a deodorizer, 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 depositing unit 70 allows a material (raw material) containing fibers to be deposited, and deposits at least a part of the defibrated material defibrated by the defibrating unit 30 in the air. Specifically, the depositing unit 70 forms a web W by depositing using a material containing fibers and binder resin introduced from the pipe 204, and has a mechanism for uniformly dispersing the fibers in the air. I have.

  As a mechanism for uniformly dispersing the fibers in the air, the depositing unit 70 is provided with a sieve 71 into which the fibers and the binder resin are put. Then, by rotating the sieve 71, the binder resin (additive) can be uniformly mixed in the passing material (fiber). The sieve 71 is provided with a screen having a plurality of small holes. Then, the sieve 71 is driven to rotate, and the binder resin (additive) is uniformly mixed in the passing material (fiber), and the fiber and the mixture of the fiber and the fiber and the binder resin are uniformly mixed in the air. Can be dispersed.

  Below the sieve 71, a transport unit 180 for transporting the deposited deposit (web W) is disposed. Specifically, a tension roller 72 and an endless mesh belt 73 in which a mesh stretched by the tension roller 72 is formed as a part of the conveyance unit 180 are configured below the accumulation unit 70. ing. The mesh belt 73 rotates (moves) in one direction when at least one of the stretching rollers 72 rotates. In addition, the web W concerning this embodiment says the structure form of the object containing a fiber and binder resin. Therefore, even when the shape or the like changes during heating, pressurizing, cutting, or conveying the web, the web is shown. In addition, a suction device 75 as a suction unit that generates an airflow directed vertically downward is provided below the sieve 71 via a mesh belt 73. The suction device 75 can suck the fibers dispersed in the air onto the mesh belt 73.

  Then, the fibers and the like that have passed through the small hole screen of the sieve 71 are deposited on the mesh belt 73 by the suction force by the suction device 75. At this time, by moving the mesh belt 73 in one direction, it is possible to form a web W that includes fibers and a binder resin and is deposited in a long shape. By continuously dispersing from the sieve 71 and moving the mesh belt 73, a continuous belt-like web W is formed. The mesh belt 73 may be made of metal, resin, or non-woven fabric, and may be any material as long as fibers can be deposited and an air stream can pass therethrough. Note that if the mesh hole diameter of the mesh belt 73 is too large, fibers enter between the meshes, resulting in unevenness when the web W (sheet) is formed. On the other hand, if 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 according to the transport direction (the white arrow in the figure) by the rotational movement of the mesh belt 73.

  A forming unit 90 is disposed on the downstream side of the stretching roller 72a on the downstream side of the mesh belt 73 in the conveyance direction of the web W. The forming unit 90 forms the sheet by heating the web W (deposit) conveyed by the conveying unit 180 in a non-contact manner. The forming unit 90 is, for example, a far-infrared heating furnace, and is a furnace that continuously heats the web W in a non-contact manner by irradiating the transported web W with far-infrared rays. Then, by heating the web W, the binder resin is melted and easily entangled with the fibers.

  A temperature detection unit 190 is disposed on the downstream side of the forming unit 90 in the conveyance direction of the web W. The temperature detection unit 190 detects the temperature of the web W (sheet). The temperature detection unit 190 of this embodiment is a non-contact type temperature sensor, and can measure the temperature of the web W by detecting, for example, the intensity of infrared light or visible light emitted from the web W that has passed through the molding unit 90. A simple radiation thermometer can be applied. By using a non-contact type temperature sensor, it is possible to prevent the web W from being damaged. The temperature detection unit 190 is connected to the control unit 2, and temperature data detected by the temperature detection unit 190 is configured to be transmitted to the control unit 2.

  A pair of transport rollers 100 constituting a part of the transport unit 180 is disposed on the downstream side of the temperature detection unit 190 in the transport direction of the web W. The conveyance roller pair 100 includes rollers 101 and 102 and conveys the web W to the downstream side. Further, the transport roller pair 100 usually has a function of pressurizing the web W to form a predetermined thickness and density. Furthermore, by pressing and heating the web W using the conveying roller pair 100 as a heating roller having a heating mechanism, it is possible to increase the accuracy of the thickness of the web W as compared with the case of only pressing.

  On the downstream side of the conveyance roller pair 100 in the conveyance direction of the web W, a winding unit 160 for winding the molded web W is disposed. The winding unit 160 includes a winding roller 161, and the web W can be wound up following the winding roller 161 by rotating the winding roller 161. The web W may be cut into a predetermined size and the cut web W may be stored. With the above configuration, the sheet Pr can be manufactured in the sheet manufacturing apparatus 1.

  In addition, the sheet | seat concerning the said embodiment mainly says what used the thing containing fibers, such as used paper and a pure pulp, as a 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 thin sheet form, 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.

  In the present embodiment, 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.

  Next, a control method for the sheet manufacturing apparatus will be described. FIG. 2 is a flowchart showing a control method of the sheet manufacturing apparatus.

  First, in step S11, the temperature of the web W (sheet) is detected. Specifically, the temperature detection unit 190 is driven to detect the temperature of the web W that has passed through the forming unit 90. The detected temperature data is transmitted to the control unit 2.

  Next, in step S12, it is determined whether or not the temperature of the web W is an allowable value from the detected temperature data. The allowable value of the temperature of the web W is a preset temperature. The allowable value is a value having an allowable temperature range including temperature variation. When it is determined that the temperature of the web W is an allowable value (YES), the process proceeds to step S13, and when it is determined that the temperature of the web W is not an allowable value (NO), the process proceeds to step S15.

  When the process proceeds to step S13, the supply amount of the material supplied to the deposition unit 70 is not changed. In step S14, the conveyance speed of the web W (deposit) by the conveyance unit 180 is not changed. This is because the temperature of the web W is an allowable value, and there is no problem in the quality of the web W.

  On the other hand, when the process proceeds to step S15, in step S15, it is determined from the detected temperature data whether the temperature of the web W is lower than an allowable value. When it is determined that the temperature of the web W is lower than the allowable value (YES), the process proceeds to step S16, and when it is determined that the temperature of the web W is not lower than the allowable value, that is, the web W If it is determined that the temperature is higher than the allowable value (NO), the process proceeds to step S18.

  When the process proceeds to step S16, the material supply amount is changed. Specifically, the supply amount of the material supplied to the deposition unit 70 is changed. More specifically, the supply amount of the material supplied to the deposition unit 70 is reduced. In this case, for example, the supply amount of the raw material by the supply unit 10 is reduced. Thereby, the supply amount of the material supplied to the deposition part 70 can be reduced.

  Next, in step S <b> 17, the conveyance speed of the web W (deposit) is changed according to the supply amount of the material supplied to the deposition unit 70. Specifically, the conveyance speed of the web W (deposit) by the conveyance unit 180 is decreased. Thereby, the passage time of the web W which passes the shaping | molding part 90 becomes long, and heating time becomes longer. Accordingly, the heating time for the web W is secured. Further, since the supply amount of the material supplied to the deposition unit 70 is reduced and the conveyance speed is lowered, the deposition thickness of the web W put into the molding unit 90 becomes substantially constant. Thereby, the sheet Pr (web W) having a uniform thickness can be formed.

  Moreover, when transfering to step S18, the supply amount of material is changed. Specifically, the supply amount of the material supplied to the deposition unit 70 is changed. More specifically, the supply amount of the material supplied to the deposition unit 70 is increased. In this case, for example, the supply amount of the raw material by the supply unit 10 is increased. Thereby, the supply amount of the material supplied to the deposition part 70 can be increased.

  Next, in step S19, the conveyance speed of the web W (deposit) is changed according to the supply amount of the material supplied to the deposition unit 70. Specifically, the conveyance speed of the web W (deposit) by the conveyance unit 180 is increased. Thereby, the passage time of the web W which passes the shaping | molding part 90 becomes short, and heating time is shortened more. Accordingly, the heating time for the web W is shortened, and the web W is not heated more than necessary. Further, since the supply amount of the material supplied to the deposition unit 70 is increased and the conveyance speed is increased, the deposition thickness of the web W put into the molding unit 90 is substantially constant. Thereby, the sheet Pr (web W) having a uniform thickness can be formed, and productivity can be improved.

  Note that the correction amount of the material supply amount by the supply unit 10 with respect to the temperature of the web W by the temperature detection unit 190 in this embodiment is obtained in advance through experiments and the like in the sheet manufacturing apparatus 1, and the temperature of the web W The relational data with the material supply amount is known, and is driven and controlled by the control unit 2 based on the relational data.

  As described above, according to the present embodiment, the following effects can be obtained.

  By changing the conveyance speed of the web W in a state where the heating temperature in the forming unit 90 is kept constant, the sheet Pr can be manufactured without reducing productivity. Further, the supply amount of the material supplied to the deposition unit 70 is changed based on the temperature of the web W. And the conveyance speed of the web W is changed according to the supply amount of a material. Thereby, the sheet Pr having a uniform thickness can be manufactured.

(Second Embodiment)
Next, a second embodiment will be described. The basic configuration of the sheet manufacturing apparatus according to the present embodiment is the same as the configuration of the sheet manufacturing apparatus 1 of the first embodiment, and a description thereof will be omitted. A method for controlling the sheet manufacturing apparatus according to the present embodiment will be described. FIG. 3 is a flowchart showing a control method of the sheet manufacturing apparatus.

  First, in step S21, the temperature of the web W (sheet) is detected. Specifically, the temperature detection unit 190 is driven to detect the temperature of the web W that has passed through the forming unit 90. The detected temperature data is transmitted to the control unit 2.

  Next, in step S22, it is determined whether or not the temperature of the web W is an allowable value from the detected temperature data. The allowable value of the temperature of the web W is a preset temperature. The allowable value is a value having an allowable temperature range including temperature variation. When it is determined that the temperature of the web W is an allowable value (YES), the process proceeds to step S23, and when it is determined that the temperature of the web W is not an allowable value (NO), the process proceeds to step S25.

  When the process proceeds to step S23, the supply amount of the material supplied to the deposition unit 70 is not changed. In step S24, the conveyance speed of the web W (deposit) by the conveyance unit 180 is not changed. This is because the temperature of the web W is an allowable value, and there is no problem in the quality of the web W.

  On the other hand, when the process proceeds to step S25, it is determined in step S25 whether or not the temperature of the web W is lower than the allowable value from the detected temperature data. If it is determined that the temperature of the web W is lower than the allowable value (YES), the process proceeds to step S26, and if it is determined that the temperature of the web W is not lower than the allowable value, that is, the web W If it is determined that the temperature is higher than the allowable value (NO), the process proceeds to step S28.

  When it transfers to step S26, the rotational speed of the sieve 71 of the accumulation part 70 is changed. Specifically, the rotation speed of the sieve 71 is decreased. Thereby, the supply amount of the material supplied from the deposition part 70 can be reduced.

  Next, in step S27, the conveyance speed of the web W (deposit) is changed according to the supply amount of the material supplied from the deposition unit 70. Specifically, the conveyance speed of the web W (deposit) by the conveyance unit 180 is decreased. Thereby, the passage time of the web W which passes the shaping | molding part 90 becomes long, and heating time becomes longer. Accordingly, the heating time for the web W is secured. Further, since the supply amount of the material supplied to the deposition unit 70 is reduced and the conveyance speed is lowered, the deposition thickness of the web W put into the molding unit 90 becomes substantially constant. Thereby, the sheet Pr (web W) having a uniform thickness can be formed.

  On the other hand, when it transfers to step S28, the rotational speed of the sieve 71 of the accumulation part 70 is made high-speed. Thereby, the supply amount of the material supplied from the deposition part 70 can be increased.

  Next, in step S29, the conveyance speed of the web W (deposit) is changed according to the supply amount of the material supplied from the deposition unit. Specifically, the conveyance speed of the web W (deposit) by the conveyance unit 180 is increased. Thereby, the passage time of the web W which passes the shaping | molding part 90 becomes short, and heating time is shortened more. Accordingly, the heating time for the web W is shortened, and the web W is not heated more than necessary. Further, since the supply amount of the material supplied to the deposition unit 70 is increased and the conveyance speed is increased, the deposition thickness of the web W put into the molding unit 90 is substantially constant. Thereby, the sheet Pr (web W) having a uniform thickness can be formed, and productivity can be improved.

  Note that the correction amount of the material supply amount corresponding to the rotational speed of the sieve 71 with respect to the temperature of the web W by the temperature detection unit 190 in this embodiment is obtained in advance through experiments and the like in the characteristics of the sheet manufacturing apparatus 1. The relationship data between the temperature of W and the supply amount of the material is known, and drive control is performed by the control unit 2 based on the relationship data.

  As described above, according to the present embodiment, the following effects can be obtained.

  By changing the conveyance speed of the web W in a state where the heating temperature in the forming unit 90 is kept constant, the sheet Pr can be manufactured without reducing productivity. Further, based on the temperature of the web W, the supply amount of the material to be supplied is changed by changing the rotation speed of the sieve 71 of the deposition unit 70. And the conveyance speed of the web W is changed according to the supply amount of a material. Thereby, the sheet Pr having a uniform thickness can be manufactured.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be added to the above-described embodiment. Moreover, you may combine each embodiment mentioned above suitably. Even if it does in this way, the effect similar to the said effect can be acquired.

  DESCRIPTION OF SYMBOLS 1 ... Sheet manufacturing apparatus, 2 ... Control part, 10 ... Supply part, 20 ... Crushing part, 30 ... Defibration part, 40 ... Classification part, 50 ... Sorting part, 60 ... Additive input part, 70 ... Deposition part, DESCRIPTION OF SYMBOLS 71 ... Sieve, 72 ... Stretching roller, 72a ... Downstream tension roller, 73 ... Mesh belt (a part of conveyance part 180), 75 ... Suction device, 90 ... Molding part, 100 ... Conveyance roller pair (conveyance part) 180), 160 ... winding unit, 180 ... transport unit, 190 ... temperature detection unit.

Claims (5)

A deposition section for depositing a material containing fibers;
A transport unit for transporting deposits deposited by the deposition unit;
A molding unit that heats the deposit conveyed by the conveyance unit in a non-contact manner to mold a sheet;
A temperature detection unit for detecting the temperature of the sheet,
The sheet conveying apparatus, wherein the conveying unit changes a conveying speed of the deposit based on the temperature of the sheet detected by the temperature detecting unit. In the sheet manufacturing apparatus according to claim 1,
Based on the temperature of the sheet detected by the temperature detection unit, a control unit that changes the supply amount of the material supplied to the deposition unit,
The sheet transporting apparatus, wherein the transport unit changes a transport speed of the deposit according to a supply amount of the material supplied to the deposition unit. In the sheet manufacturing apparatus according to claim 2,
A supply unit for supplying raw materials including fibers;
A defibrating unit for defibrating the raw material,
The material includes at least a part of the defibrated material defibrated at the defibrating unit,
The said control part changes the supply amount of the said raw material by the said supply part, The sheet manufacturing apparatus characterized by the above-mentioned. In the sheet manufacturing apparatus according to claim 1,
The accumulation part has a rotating sieve,
Based on the temperature of the sheet detected by the temperature detection unit, a control unit that changes the rotation speed of the sieve,
The sheet manufacturing apparatus, wherein the conveyance unit changes a conveyance speed of the deposit according to a rotation speed of the sieve. Deposit material containing fiber,
Transport the deposited sediment,
Heating the deposit to be conveyed in a non-contact manner to form a sheet;
Detecting the temperature of the sheet,
A sheet manufacturing method, wherein a transport speed of the deposit is changed based on the detected temperature of the sheet.

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