JP6308909B2 - Paper machine - Google Patents

Description

  The present invention relates to a long net papermaking machine capable of reducing variations in thickness of a papermaking body.

  A plate material such as a fiberboard manufactured from a slurry raw material is manufactured using a papermaking method. Among them, in the paper making using the long net paper making machine, the raw material is discharged from the discharge port of the raw material supply tank, and this raw material is conveyed by the paper making belt. The raw material is a slurry in which cement or pulp is mixed with water, or is mainly a slurry of pulp and water. A suction box is provided below the papermaking belt. The moisture of the raw material is sucked by this suction box, so that a wet sheet is formed. Thereafter, the sheet is cut by a cutter to obtain a paper product having a predetermined shape.

  This papermaking method may cause a thickness variation of about 5 to 30% in the width direction of the manufactured plate as a finished product, depending on various factors. Factors include raw material concentration (amount of mineral or fiber material) and viscosity, fiber length and particle size, fiber quality, felt dirt, raw material flow rate, raw material sedimentation, raw material deterioration over time, Examples include the direction and speed of circulation by an agitator in the tank.

  For example, Patent Document 1 discloses a papermaking machine that makes the thickness of the papermaking body uniform in the width direction.

WO2009 / 072419

  The papermaking machine described in Patent Document 1 includes a partition plate that extends in the raw material conveyance direction from the beginning of the papermaking zone above the papermaking zone. As a result, the papermaking zone is divided in the width direction to make the thickness uniform.

  However, the papermaking machine described in Patent Document 1 is inferior in the finished product because traces of the partition plate are formed on the papermaking body during papermaking. Also, when replacing the felt of the dirty papermaking belt, it was necessary to remove the partition plate, and maintenance was difficult. Further, cleaning the partition plate itself has made maintenance difficult. Furthermore, since it is necessary to control the supply of raw materials to each partition divided by the partition plate, the apparatus configuration and work are complicated.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a papermaking machine capable of suitably adjusting the thickness variation in the widthwise direction of the papermaking body with respect to factors that change with time. To do.

In order to solve the above-described problems, the papermaking machine according to the present invention includes a supply layer that supplies a raw material slurry, a papermaking belt that picks up and conveys solids in the slurry supplied from the supply layer, A paper amount adjusting device that reduces the amount of the solid content that is made on the paper making belt in the width direction in accordance with the thickness in the substantially width direction of the paper made on the paper making belt. The sheet making amount adjusting device includes a sheet-like adjusting device that covers at least a part of the surface of the sheet forming belt with a plurality of sheet pieces divided in the width direction of the sheet forming belt, and the divided sheet The amount of the solid content is adjusted by covering the surface of the papermaking belt for each piece .

  In the papermaking machine according to the present invention, the thickness variation in the widthwise direction of the papermaking body can be suitably adjusted with respect to factors that change with time.

1 is an overall configuration diagram showing an embodiment of a papermaking machine according to the present invention. Explanatory drawing which looked at the sheet-like adjustment apparatus in 1st Embodiment from the side. Explanatory drawing which looked at the sheet-like adjustment apparatus in 1st Embodiment from upper direction. Explanatory drawing which looked at the sheet-like adjustment apparatus of the papermaking machine as a modification of 1st Embodiment from the side surface. The whole block diagram which shows the papermaking machine as another modification of 1st Embodiment. Explanatory drawing which looked at the bubble adjustment apparatus of the papermaking machine of 2nd Embodiment from the side. Explanatory drawing which looked at the bubble adjustment apparatus of the papermaking machine of 2nd Embodiment from upper direction. Explanatory drawing which looked at the bubble adjustment apparatus of the paper machine as a modification of 2nd Embodiment from the side.

[First Embodiment]
A paper machine according to a first embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an overall configuration diagram showing an embodiment of a papermaking machine according to the present invention.
FIG. 2 is an explanatory view of the sheet-like adjusting device 50 according to the first embodiment as viewed from the side.
FIG. 3 is an explanatory view of the sheet-like adjusting device 50 according to the first embodiment as viewed from above. In FIG. 3, of the eight sheet pieces 51, only the left and right five sheets are used, and the other three sheets are not used.

  The papermaking machine 1a is used in a papermaking process when manufacturing plate materials such as siding boards, silica boards, pulp boards, and cement boards, which are residential building materials. The papermaking machine 1 a is a long-net type papermaking machine, and includes a conveyor device 2, a raw material supply tank 3, and a winding roller 4.

  The conveyor device 2 has a papermaking belt 10 made of, for example, felt or a wire mesh, and conveys the papermaking body. The papermaking belt 10 is disposed between a breast roll 16 provided below a discharge port 12 (see FIG. 2) of the raw material supply tank 3 and a bottom couch roll 17 provided at a predetermined interval from the breast roll 16. It is built in a loop shape.

  The conveyor device 2 includes a papermaking zone 18 having an upward inclination from the vicinity of the discharge port 12 toward the conveyance direction of the papermaking belt 10. The papermaking belt 10 conveys the slurry 15 discharged to the papermaking zone 18 while storing it. Side plates 19 are provided on both sides of the papermaking zone 18 as shown in FIG. The papermaking zone 18 is provided with a suction box 20 on the side opposite to the raw material via the papermaking belt 10. The suction box 20 includes a vacuum suction device and the like, and sucks moisture of the papermaking body 5 a through the papermaking belt 10. Although not shown, a suction box is provided in addition to the papermaking zone 18.

  The raw material supply tank 3 is arranged on the front side of the papermaking zone 18 and stores the raw material slurry 15. That is, the papermaking machine 1 a is a forward flow type papermaking machine that supplies slurry (raw material) along the conveying direction of the papermaking belt 10. As shown in FIG. 2, an agitator 21 (stirrer) that prevents the slurry 15 from being precipitated is provided in the raw material supply tank 3. The agitator 21 can be omitted. The raw material supply tank 3 supplies the slurry 15 to the papermaking zone 18 through the discharge port 12. In order to adjust the supply amount of the slurry 15 from the discharge port 12 to the papermaking zone 18, the raw material supply tank 3 has a partition plate 13 that can move up and down. The raw material (slurry) is, for example, a mixture of water, a mineral material such as cement, and a fiber material such as pulp, or a mixture of mainly pulp and water.

  The winding roller 4 is rotatably provided on the downstream side in the transport direction of the conveyor device 2. The winding roller 4 is provided to wind up the papermaking body 5a conveyed on the conveyor device 2. In the vicinity of the winding roller 4, a cutting device 25 such as a cutter for cutting the papermaking body 5 b that has completed winding of a predetermined number of layers is disposed. A conveyor device 30 having a transfer belt 31 is further provided on the downstream side of the winding roller 4. The papermaking body 5c cut from the winding roller 4 is transferred to the next process on the transfer belt 31.

  The papermaking machine 1a in the first embodiment has a thickness measuring device 40. The thickness measuring device 40 has a thickness (a thickness at a plurality of positions in the width direction) in a substantially width direction (a direction substantially orthogonal to the conveying direction of the conveyor devices 2 and 30) of the paper making body 5c formed and formed on the paper making belt 10. Measure. Various types such as a non-contact optical type and a capacitance type can be used for the thickness measuring device 40. The thickness information measured by the thickness measuring device 40 is transmitted to the controller 41. The controller 41 controls the sheet-like adjusting device 50 based on the thickness information.

  The controller 41 and the sheet-like adjusting device 50 are provided as a paper making amount adjusting device. The papermaking amount adjusting device reduces the amount of solids to be made on the papermaking belt 10 in the substantially width direction according to the thickness in the substantially width direction of the papermaking body 5c measured by the thickness measuring device 40.

  The sheet-like adjusting device 50 covers at least a part of the papermaking belt 10 in the papermaking zone 18 with a sheet piece 51 divided into a plurality of pieces in the width direction of the papermaking belt 10. Thereby, the sheet-like adjusting device 50 reduces the amount of the papermaking body 5a that is made up by the papermaking belt 10. The sheet-like adjusting device 50 can be adjusted (unwinding or winding) by the winding unit 52 for each sheet piece 51 by being controlled by the controller 41. For example, the sheet piece 51 is preferably unwound from the discharge port 12 to a length of about 50% in the conveyance direction of the papermaking zone 18.

  The sheet piece 51 is a sheet-like member such as a steel material, a resin material, or a cloth material, and may be a member that does not allow the raw material to pass therethrough or may pass a certain amount of the raw material (for example, a mesh shape).

  Next, the operation of the papermaking machine 1a in the first embodiment will be described.

  The papermaking belt 10 is caused to travel in a state where the slurry 15 is stored in the raw material supply tank 3. For example, a general paper making speed is 30 to 150 m / min. The slurry 15 in the raw material supply tank 3 is supplied to the papermaking zone 18 by the running of the papermaking belt 10 and the water head difference (water pressure) of the slurry 15. Due to the gravity of the slurry 15 and suction by the suction box 20, the solid content in the slurry 15 adheres (made) to the surface of the papermaking belt 10 as the papermaking body 5 a. At that time, most of the water in the slurry 15 is discharged from the suction box 20 to the outside. The thickness of the papermaking body 5a is, for example, 1 to 3 mm.

  The papermaking body 5a adhering to the papermaking belt 10 is conveyed by the papermaking belt 10 and continuously sent. When the papermaking body 5 a is sent to the take-up roller 4, it is taken up by the take-up roller 4. The papermaking body 5b taken up by the take-up roller 4 is peeled from the take-up roller 4 and cut by a cutting device at a predetermined thickness. The cut papermaking body 5 c is transferred by the transfer belt 31.

  The papermaking body 5c thus formed is measured on the transfer belt 31 by the thickness measuring device 40, and thickness information of the papermaking body 5c in the substantially width direction is obtained. The controller 41 acquires thickness information and controls the sheet-like adjusting device 50. That is, by covering the surface of the papermaking belt 10 for each of the plurality of divided sheet pieces 51, the surface area of the papermaking belt 10 is changed to a small size, or the papermaking body 5a attached to the papermaking belt 10 is scraped off. The amount of solid content to be made on the belt 10 is adjusted. In addition, when the sheet piece 51 is in a mesh shape, the slurry that has passed through the sheet piece is made up, but even in such a case, the sheet piece 51 can be solidified by increasing the resistance to making up. Adjust the amount of minutes. In addition, since the sheet piece 51 is unwound from the winding unit 52 and then conveyed on the papermaking belt 10 as the papermaking belt 10 travels, it can suitably cover the papermaking belt 10.

  The controller 41 adjusts (reduces) the amount of solid content by the type (position) and number of sheet pieces 51 covering the surface of the papermaking belt 10 and the amount of unwinding of the winding unit 52 (area covering the papermaking belt 10). ).

  For example, when the controller 41 determines that the thickness in the center in the width direction of the papermaking body 5c is 0.2 mm smaller than both ends, the controller 41 determines the papermaking belt 10 based on the adjustment amount obtained experimentally in advance and recorded in the database. The covering sheet piece 51 is determined and the unwinding amount is determined. For example, the unwinding amount of the sheet pieces 51 other than the center (both ends) is preferably adjusted. The difference in thickness between the central portion and both ends of the papermaking body 5c changes continuously. For this reason, it is preferable that the unwinding amount of the sheet piece 51 is always changed by the control of the controller 41.

  By the action of the sheet-like adjusting device 50, the amount of solid content in the slurry 15 made on the papermaking belt 10 is adjusted, the variation in the thickness in the width direction occurring in the papermaking body 5c is eliminated, and a smooth finished product is obtained. As a result, a plate material is obtained.

  The papermaking machine 1a according to the first embodiment can obtain the variation in the thickness in the width direction of the papermaking body 5c that changes with time in real time, and can adjust the amount of papermaking on the papermaking belt 10.

  Conventionally, the variation in the thickness in the width direction generated in the papermaking body 5c is finally adjusted by pressing or scraping with a sander. For this reason, in order to make the thickness uniform, waste of raw materials and manufacturing energy has occurred. On the other hand, the papermaking machine 1a in the first embodiment can finely adjust the papermaking amount, and can make the thickness in the width direction of the papermaking body 5c finally obtained uniform.

  Note that the solid content of the slurry 15 may adhere to the sheet-like adjusting device 50. When the solid content of the slurry 15 adheres, an error may occur with respect to a desired adjustment amount determined by the controller 41. In order to eliminate this, the sheet-like adjusting device 50 may include a cleaning unit. The cleaning means is, for example, a doctor device (a spatula) or a shower (water) that scrapes off the solid content adhering to each sheet piece 51 of the sheet-like adjusting device 50.

  Note that the sheet-like adjusting device 50 may perform unwinding and winding of the sheet piece 51 from another position instead of the front of the raw material supply tank 3.

  For example, FIG. 4 is an explanatory diagram viewed from the side of the sheet-like adjusting device 50 of the papermaking machine 1b as a modification of the first embodiment. Components and parts corresponding to those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The sheet-like adjusting device 50 shown in FIG. 4 includes a winding unit 52 that adjusts the usage (unwinding or winding) for each sheet piece 51 above the raw material supply tank 3. Thus, if the sheet piece 51 can cover the surface of the papermaking belt 10, the configuration of the sheet-like adjusting device 50 is not limited. Further, the sheet-like adjusting device 50 may cover the surface of the papermaking belt 10 by extruding or pulling back the plate-like sheet piece 51 using a power source.

  The sheet-like adjusting device 50 may also be applied to a forward flow type or a reverse flow type single layer papermaking machine.

  For example, FIG. 5 is an overall configuration diagram showing a papermaking machine 1c as another modification of the first embodiment.

  The papermaking machine 1c is a reverse flow type single-layer papermaking machine that supplies the raw material slurry 15 in a direction opposite to the conveying direction of the papermaking belt 10. The paper making machine 1a forms a multilayer paper making body 5b by winding a plurality of paper making bodies 5a with a winding roller 4, whereas the paper making machine 1c is a continuous single layer paper making body fed from the paper making zone 18. 5a is cut by a cutting device (not shown) at a predetermined timing to form a papermaking body 5c. The papermaking speed is, for example, 5 to 20 m / min, and the papermaking bodies 5a and 5c have a thickness of, for example, 5 to 30 mm. Since the other configuration is substantially the same as that of the papermaking machine 1a, the corresponding components and parts are denoted by the same reference numerals, and the description of the overlapping papermaking machine 1c is omitted.

  The papermaking machine 1c as another modification can finely adjust the papermaking amount in the same manner as the papermaking machine 1a, and the thickness of the papermaking body 5c finally obtained can be made uniform.

[Second Embodiment]
A paper machine according to a second embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 6 is an explanatory view of the bubble adjusting device 60 of the papermaking machine 1d according to the second embodiment as viewed from the side.
FIG. 7 is an explanatory view of the bubble adjusting device 60 of the papermaking machine 1d according to the second embodiment as viewed from above.

  The papermaking machine 1d in the second embodiment is different from the papermaking machine 1a in the first embodiment in that the papermaking amount adjusting device includes a bubble adjusting device 60 instead of the sheet-like adjusting device 50. Components and parts corresponding to those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The bubble adjusting device 60 (bubble adjusting device) pressurizes air toward the vicinity of the surface of the papermaking belt 10 from a plurality of nozzles 61 provided in the width direction and injects bubbles 62. The bubble adjusting device 60 suppresses the solid content in the slurry 15 from adhering to the papermaking belt 10 by the air bubbles 62 sprayed for each nozzle 61 (the solid content is brought close to the papermaking), or the adhering solid. Cut away the minutes. Thereby, the bubble adjustment apparatus 60 adjusts the quantity of solid content. The bubble adjusting device 60 is controlled by the controller 41 so that the bubbles 62 can be ejected for each nozzle 61.

  6 and 7, the bubble adjusting device 60 is disposed on the front side of the discharge port 12 in the raw material supply tank 3. However, the bubble adjusting device 60 may be disposed in the papermaking zone 18 as long as the supply direction of the slurry 15 and the bubble injection direction coincide.

  Next, the operation of the papermaking machine 1d in the second embodiment will be described.

  As shown in FIG. 1, the formed paper product 5c is measured on the transfer belt 31 by the thickness measuring device 40, and thickness information in the substantially width direction of the paper product 5c is obtained. The controller 41 acquires thickness information and controls the bubble adjustment device 60. That is, the bubble adjusting device 60 jets the bubbles 62 from the required nozzle 61 and covers the surface of the papermaking belt 10 with the bubbles 62, thereby changing the concentration of the slurry in the bubbles 62 portion. As a result, the bubble adjusting device 60 adjusts (reduces) the amount of solids adhering to the papermaking belt 10.

  The controller 41 adjusts the amount of solids according to the position (injection location) and the number of nozzles 61 that inject the bubbles 62 to cover the surface of the papermaking belt 10, the injection amount of the bubbles 62, the injection speed, the injection direction, and the like. To do.

  Thus, the bubble adjusting device 60 acts to adjust the amount of the solid content in the slurry 15 to be made on the papermaking belt 10, and to eliminate the variation in the thickness in the width direction occurring in the papermaking body 5c. A plate material as a smooth finished product is obtained.

  The papermaking machine 1d according to the second embodiment can adjust the amount of papermaking on the papermaking belt 10 by obtaining a variation in the thickness in the width direction of the papermaking body 5c that changes with time in real time.

  The bubble adjusting device 60 (nozzle 61) may be provided with a cleaning means for removing the solid content of the attached slurry 15. The cleaning means has, for example, a brush that removes the solid content attached to the nozzle 61 or a function that ejects air bubbles more powerfully than the nozzle 61 at regular or arbitrary timing.

  Further, the bubble adjusting device may be a water bubble adjusting device that ejects water bubbles instead of bubbles. Moreover, the foam adjusting device may inject a mixture of bubbles and water bubbles. Further, in the second embodiment, the example in which the bubble adjusting device 60 is provided in the forward flow type paper making machine 1d has been described, but the forward flow type single layer paper making machine or the reverse flow type single layer paper making machine may be provided.

  For example, FIG. 8 is an explanatory view of the bubble adjusting device 60 of the papermaking machine 1e as a modification of the second embodiment as viewed from the side.

  The air bubble adjusting device 60 of the reverse flow type single layer paper making machine 1 e supplies air bubbles along the direction opposite to the supply direction of the slurry 15, that is, along the conveying direction of the paper making belt 10. The papermaking machine 1e as a modified example can finely adjust the papermaking amount in the same manner as the papermaking machine 1d, and the thickness of the papermaking body 5c finally obtained can be made uniform.

  The bubble adjusting device 60 is preferably provided in the vicinity of the arrangement position shown in FIGS. 6 to 8, but is not limited thereto as long as it is provided in the papermaking zone 18. Further, the air bubble adjusting device 60 may be provided so as to supply air bubbles along the supply direction of the slurry 15, that is, in the reverse direction to the conveying direction of the papermaking belt 10 in the case of a reverse flow type papermaking machine.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  For example, you may combine each finishing amount adjustment apparatus of 1st and 2nd embodiment.

  The thickness measuring device 40 may be provided on the winding roller 4 or upstream of the winding roller 4 (that is, on the papermaking belt 10), and may measure the thickness of each papermaking body (for example, the papermaking bodies 5a and 5b). That is, the installation position of the thickness measuring device 40 is not limited to the above-described embodiment. Moreover, the thickness measuring apparatus 40 does not need to be a part of a papermaking machine. For example, the thickness information may be obtained using a thickness measuring device independent of the papermaking machine, and the thickness information may be provided to the controller 41. Further, the thickness may be determined by visual recognition of the user (human) and the thickness information may be input to the controller 41.

  The adjustment amount can be determined by previously storing an adjustment amount obtained by an experiment in a database for each thickness variation pattern, and selecting from the adjustment amounts stored in accordance with the obtained thickness information. Alternatively, the adjustment amount may be determined by providing a calculation device in the finishing amount adjusting device and calculating in real time according to the obtained thickness information.

  There may be one supply port for supplying the slurry 15 to the raw material supply tank 3, or a plurality of supply ports may be provided at positions corresponding to the respective sheet pieces 51 and the respective nozzles 61. When a plurality of supply ports are provided, the concentration and amount of the raw material can be adjusted for each supply port. Thereby, in addition to the adjustment of the amount of papermaking by the sheet piece 51 and the nozzle 61, the supply of the raw material to the papermaking zone 18 is adjusted for each supply port, so that the amount of papermaking can be adjusted more finely. it can.

1a, 1b, 1c, 1d, 1e Papermaking machine 2, 30 Conveyor device 3 Raw material supply tank 4 Winding rollers 5a, 5b, 5c Papermaking body 10 Papermaking belt 12 Discharge port 13 Partition plate 15 Slurry 16 Breast roll 17 Bottom couch roll 18 Papermaking zone 19 Side plate 20 Suction box 21 Agitator 25 Cutting device 31 Transfer belt 40 Thickness measuring device 41 Controller 50 Sheet-shaped adjusting device 51 Sheet piece 52 Winding unit 60 Bubble adjusting device 61 Nozzle 62 Bubble

Claims (2)

A supply tank for supplying raw material slurry;
A papermaking belt for picking up and conveying solids in the slurry supplied from the supply tank;
According to the thickness in the width direction of the papermaking body formed and formed on the papermaking belt, the amount of papermaking adjustment that reduces the amount of the solid content that is made up on the papermaking belt in the width direction. An apparatus,
The papermaking amount adjusting device includes a sheet-like adjusting device that covers at least a part of the surface of the papermaking belt with a plurality of sheet pieces divided in the width direction of the papermaking belt, and the papermaking amount is adjusted for each divided sheet piece. A papermaking machine, wherein the amount of the solid content is adjusted by covering a belt surface. The papermaking machine according to claim 1 , further comprising a thickness measuring device for measuring the thickness in the width direction.

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