JP2009035842A - System and method for inhibiting soil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system and a method for inhibiting soil which are capable of sufficiently inhibiting the attachment of soil on a drying part without stopping the operation of a papermaking apparatus. <P>SOLUTION: The system 13 inhibits the soil attaching to the drying part 40 for drying wet paper, and is equipped with a reducing part 50 capable of reducing the attached soil on the drying part 40 and photograph-taking parts 621a, 621b for taking photographs of the soil attached to the drying part 40. A regulating part 61 operates the reducing part 50 based on the soil photographed by the photograph-taking parts 621a, 621b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a system and method for suppressing dirt attached to a papermaking apparatus, and more particularly to a system and method for suppressing dirt attached to a drying section of a papermaking apparatus.

  Generally, a papermaking apparatus includes a stock outflow portion (inlet) through which a raw material flows out, a dewatering unit (wire part) for dewatering the raw material outflowed from the stock outflow portion, and a pressing unit (press part) for pressing. . By sequentially passing through these parts, the moisture content of the raw material is reduced to about 50%, and a wet paper is formed. Further, the paper making apparatus further includes a drying unit (dryer part), and the wet paper is strongly dried in this drying unit, whereby paper is produced.

  Conventional papermaking apparatuses have problems such as holes formed in the paper and foreign matters attached to or papered on the paper. That is, if there is a defect, not only the quality of the paper is deteriorated, but also a paper break is induced, and the operation of the paper making apparatus may have to be stopped.

A major cause of such a defect is dirt adhering to the dry part. Therefore, agents such as pitch control agents, thickening agents, and coagulants are used to suppress the adhesion of dirt to the drying section, and cationic polymers having a predetermined structure that are useful as these components have been developed (patents). Reference 1).
JP-A-6-329866

  When taking measures to suppress the adhesion of dirt to the drying section, it is necessary to check the state of dirt adhesion to the drying section. However, in the paper making apparatus described above, the drying section is covered with a hood, so that the state of contamination of the drying section cannot be confirmed when the paper making apparatus is in operation. Therefore, the confirmation of the state of dirt adhering to the drying unit must be carried out with the hood removed after stopping the operation of the paper making apparatus, resulting in lower productivity.

  Further, even if the operation of the paper making apparatus is stopped, the frequency of stoppage has to be as low as once every one week to two months. In other words, the papermaking apparatus will be operated for a long period of time, such as one week to two months, without confirming the state of dirt adhering to the drying section, and it is difficult to sufficiently suppress the adhesion of dirt to the drying section. It is.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a dirt suppression system and a dirt suppression method that can sufficiently suppress the adhesion of dirt to a drying unit without stopping the operation of a papermaking apparatus. And

(1) For a papermaking apparatus provided with a drying unit for drying wet paper, a soil suppression system that suppresses soiling attached to the drying unit,
Reducing means capable of reducing dirt adhering to the drying unit;
A paper making system comprising: detecting means for detecting dirt attached to the drying unit.

  According to the invention of (1), since the detecting means is provided, if dirt adheres to the drying unit, the dirt is automatically detected without stopping the operation of the paper making apparatus. Since this detection is sequentially performed even when the papermaking apparatus is in operation, the dirt attached to the drying unit can be sufficiently suppressed by appropriately operating the reduction means manually or automatically based on the detection result.

  (2) The dirt suppressing system according to (1), further comprising control means for operating the reducing means based on a detection result by the detecting means.

  According to the invention of (2), since the control means is provided, the operation of the reduction means based on the detection result is automatically performed. Thereby, the complexity of dirt control can be reduced.

(3) The detection means includes a quantification means for quantifying the degree of dirt attached to the drying unit,
The said control means is a stain | pollution | contamination suppression system as described in (2) which has a fluctuation | variation means to fluctuate the operation state of the said reduction means according to the fixed value by the said fixed_quantity | quantitative_assay means.

  According to the invention of (3), the operating state of the reducing means is changed according to the quantitative value. Thereby, according to the grade of the dirt adhering to a dry part, dirt can be controlled appropriately. In addition, since it is possible to prevent the reduction means from operating more than necessary, the operating cost of the dirt suppression system can be reduced.

  (4) The fluctuating means determines whether or not a quantitative value by the quantitative means exceeds a predetermined value, and operates the reducing means when it is determined that the quantitative value exceeds the predetermined value. An operation determination means. The soil suppression system according to (3).

  According to the invention of (4), the reduction means operates only when the quantitative value exceeds a predetermined value. Thereby, since the operating time of the reduction means is reduced, the operating cost of the dirt suppression system can be further reduced. Here, the predetermined value may be set as appropriate in consideration of desired quality and operating cost required for the paper.

(5) For a papermaking apparatus provided with a drying unit for drying wet paper, a dirt suppressing method for suppressing dirt attached to the drying unit,
A detection procedure for detecting dirt adhering to the drying section;
And a reduction procedure for reducing dirt attached to the drying unit based on a detection result in the detection procedure.

  (5) The stain suppressing method is a development of the stain suppressing system according to (2) as a stain suppressing method. Therefore, according to the invention of (5), the same effect as that of the invention of (2) can be obtained.

(6) The detection procedure includes a quantitative procedure for quantifying the degree of dirt attached to the drying unit,
The dirt reducing method according to (5), wherein the reducing procedure includes a changing procedure for changing a condition of the reducing procedure according to a quantitative value in the quantitative procedure.

  (6) The stain suppressing method is a development of the stain suppressing system according to (3) as a stain suppressing method. Therefore, according to the invention of (6), the same effect as that of the invention of (3) can be obtained.

  (7) The variation procedure includes a determination procedure for determining whether or not a quantitative value in the quantitative procedure exceeds a predetermined value, and an operation for executing the reduction procedure when it is determined that the quantitative value exceeds the predetermined value. A method for suppressing contamination according to (6).

  (7) The stain suppression method is a development of the stain suppression system according to (4) as a stain suppression method. Therefore, according to the invention of (7), the same effect as that of the invention of (4) can be obtained.

  (8) Concerning a papermaking apparatus including a drying unit that dries wet paper, the method is a stain suppressing method for suppressing stains attached to the drying unit, and has a monitoring procedure for monitoring the presence or absence of stains attached to the drying unit. Suppression method.

  According to the invention of (8), it is possible to monitor the presence or absence of dirt adhering to the drying section, and sequentially perform appropriate dirt suppression measures based on the monitoring result. Therefore, the adhesion of dirt to the drying part can be sufficiently suppressed.

  According to the present invention, since the detecting means is provided, if dirt adheres to the drying unit, the dirt is automatically detected without stopping the operation of the papermaking apparatus. Since this detection is sequentially performed even when the papermaking apparatus is in operation, the dirt attached to the drying unit can be sufficiently suppressed by appropriately operating the reduction means manually or automatically based on the detection result.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in description of each embodiment other than 1st Embodiment, the same code | symbol is attached | subjected about what is common in 1st Embodiment, and the description is abbreviate | omitted.

  FIG. 1 is a schematic configuration diagram of a paper making system 10 including a dirt suppression system 13 according to an embodiment of the present invention. As shown in FIG. 1, the papermaking system 10 includes a papermaking apparatus 11 and a stain suppression system 13. Each component will be described in detail below.

[Paper making equipment]
The papermaking apparatus 11 is an apparatus that processes raw materials into paper, and includes a raw material storage unit 20, a wet unit 30, and a drying unit 40 in order from the upstream.

(Raw material storage part)
The raw material storage unit 20 stores a raw material and a mixture of chemicals as appropriate, and transfers them to the wet unit 30. Specific examples of the raw materials include pulp fibers beaten as necessary, and a mixture of a filler, a yield improver, a paper strength improver, a slime control agent, an antifoaming agent, and a dye.

(Wet part)
The wet part 30 includes a paper outflow part (inlet) 31. The paper outflow part 31 dilutes the mixture transferred from the raw material storage part 20 to an appropriate concentration to obtain a paper stock. Then, the paper outflow part 31 uniformly ejects the paper stock over the entire width of the dewatering part (wire part) 32. The paper stock at the time of being ejected from the paper stock outflow portion 31 usually has a water content of about 99%.

  The dewatering unit 32 includes a ring-shaped lower wire 324, and the lower wire 324 moves as the lower roll 325 rotates. Thereby, the paper material ejected from the paper material outflow part 31 is conveyed downstream (left direction in FIG. 1). Here, the dewatering unit 32 further includes an upper wire 321 that moves as the upper roll 323 rotates, and the upper wire 321 faces the lower wire 324 across the paper. The paper material conveyed by the lower wire 324 is eventually sandwiched between the upper wire 321 and the lower wire 324, dehydrated evenly on the upper and lower surfaces, and then conveyed to a pressing part (press part) 33 described later. A tray 326 is provided below the upper wire 321. The tray 326 dewaters and receives the falling water. Further, the moisture content of the paper stock at the time when it is conveyed from the dehydrating unit 32 is usually about 80%.

  The pressing unit 33 includes a first pressing roll 331, an extrusion roll 333, and a second pressing roll 334 in order from the upstream side, and the first pressing roll 331 rotates in synchronization with the first transport roll 336 so that the first pressing roll 331 rotates. The wire 335 is moved, and the second pressing roll 334 rotates the second pressing wire 337 by rotating in synchronization with the second transport roll 338. Thereby, the paper conveyed to the pressing part 33 is conveyed further downstream.

  Moreover, the 1st pressing roll 331, the extrusion roll 333, and the 2nd pressing roll 334 are alternately arrange | positioned with respect to the conveyance direction. Thereby, the stock to be conveyed is forcibly extended in the vertical direction, and the contained water is squeezed out. Thereafter, the stock is conveyed to the drying unit 40 as wet paper. The moisture content of the wet paper at this point is usually about 55%.

(Drying part)
The drying unit 40 includes first push rolls 411, first dryer rolls 413, second push rolls 414, second dryer rolls 415, and third push rolls 416 that are alternately arranged in the transport direction from the upstream side. And the canvas 42 is moved by rotating them synchronously. The wet paper is transported along the canvas 42 and forcedly stretched up and down to squeeze out the water it contains. The first dryer roll 413 and the second dryer roll 415 are collectively referred to as a dryer roll 41.

  Further, when the wet paper comes into contact with the surfaces of the heated first dryer roll 413 and second dryer roll 415, moisture in the wet paper evaporates. As a result, the wet paper is rapidly dried and carried out as paper P having a water content of 5 to 10%. Thereafter, the paper P is appropriately processed and then shipped as a product.

  The drying unit 40 is entirely covered with a hood (not shown), and in this state, it is difficult to observe the internal state of the drying unit 40 from the outside.

[Stain control system]
The dirt suppression system 13 includes a reduction unit 50 as a reduction unit and a control device 60 that controls the reduction unit 50.

(Reduction part)
The reduction unit 50 includes an inhibitor addition unit 51 and a roll cleaning unit 52. The inhibitor addition unit 51 includes a storage tank 511, and the storage tank 511 stores an inhibitor that suppresses adhesion of dirt. The storage tank 511 communicates with the raw material reservoir 20 through a supply pipe 515, and a supply pump 513 and a supply valve 514 are provided in the supply pipe 515. By adjusting the opening of the supply valve 514 and the output of the supply pump 513, the supply amount of the inhibitor from the storage tank 511 to the raw material storage unit 20 varies.

  The inhibitor may be appropriately selected from known ones according to the quality and degree of dirt to be suppressed. Specifically, pitch control agents (surfactants, solvents, inorganic fillers, enzymes, etc.), silicon oil, petroleum hydrocarbons, acid colloids, polymers (coagulants, retention agents, paper strength agents, etc.), silica, bentonite Etc.

  In this embodiment, an internal addition method in which the inhibitor is supplied into the raw material storage unit 20 and mixed with the raw material is adopted, but the present invention is not limited to this. An attachment method can also be adopted. Although not particularly limited, the internal addition method is preferable for inorganic fillers, enzymes, polymers, silica, and bentonites, and the external addition method is preferable for solvents, silicon oil, and acid colloids. When the external addition method is employed, for example, an injection nozzle may be provided in the vicinity of the dryer roll 41, the canvas 42, and the like.

  The roll cleaning unit 52 has a scraper 521, and this scraper 521 faces the surface of the first dryer roll 413 at a predetermined distance. When dirt having a thickness of a predetermined distance or more adheres to the surface of the first dryer roll 413, the dirt is scraped off by the scraper 521 and removed from the first dryer roll 413.

  Further, a moving unit 523 is connected to the scraper 521, and the moving unit 523 can move the scraper 521. Thereby, the scraper 521 can be approached and separated from the surface of the first dryer roll 413. When the scraper 521 is brought closer to the surface of the first dryer roll 413, more dirt adhered on the first dryer roll 413 is removed, whereas when the scraper 521 is separated from the surface of the first dryer roll 413, the first Less dirt attached to the dryer roll 413 is removed.

(Control device)
The control device 60 has a detection unit 62 as detection means, and this detection unit 62 detects dirt attached to the components of the drying unit 40. The detection unit 62 includes photographing units 621a and 621b, and a quantification unit 623 as a quantification unit described later.

  The imaging unit 621a images the canvas 42, and the imaging unit 621b images the scraper 521, and detects dirt adhered to each imaging object (detection procedure). The quantification unit 623 quantifies the degree of the detected dirt (quantification procedure), and transmits the quantification value to the determination unit 611. Here, the quantification of the degree of soiling was scored by measuring quantitative properties such as the mass, shading, area or volume of the soiled soil, or by qualitative properties such as soil composition and color. This can be achieved by classifying them into grades.

  The photographing unit 621 is preferably a visual sensor such as a CCD camera, a fiberscope, an infrared camera, a laser sensor, or the like in consideration of the photographing environment in a dark place. Further, a light source, a heat-resistant member, and a dust-proof device may be provided together with the photographing unit 621 as necessary.

  Note that the imaging unit 621 and the quantitative unit 623 may be operated continuously or intermittently (for example, once / hour to once / week).

  FIG. 2 is a block diagram of the control device 60. The control unit 61 includes a determination unit 611 as a determination unit and an operation determination unit 613 as an operation determination unit. The determination unit 611 determines whether or not the quantitative value received from the quantitative unit 623 exceeds a predetermined value. Then, the operation determination unit 613 operates the reduction unit 50 when it is determined that the quantitative value exceeds a predetermined value.

  Specifically, the supply valve 514 is opened, the supply pump 513 is activated, and the supply of the inhibitor from the storage tank 511 to the raw material storage unit 20 is started. Further, the moving unit 523 is activated to bring the scraper 521 closer to the surface of the first dryer roll 413. As described above, the determination unit 611 and the operation determination unit 613 change the operation state of the reduction unit 50 according to the quantitative value by the quantitative unit 623, and constitute a changing unit.

  The control by the control device 60 will be described with reference to FIG. In FIG. 3, only the control of the supply pump 513 and the supply valve 514 will be described for convenience.

  First, the operation determination unit 613 closes the supply valve 514 as an initial state and stops the supply pump 513 (ST10). Next, the determination unit 611 determines whether or not the quantitative value from the quantitative unit 623 exceeds a predetermined value (ST20, determination procedure). If this determination is “NO”, ST20 is repeated.

  When the determination in ST20 is “YES”, the operation determination unit 613 opens the supply valve 514 and activates the supply pump 513 (ST30, operation determination procedure). Then, it returns to ST10 again and repeats the same steps. As a result, the inhibitor stored in the storage tank 511 is supplied to the raw material storage unit 20, mixed with the paper stock in the raw material storage portion 20, and then ejected from the stock outflow portion 31. Note that ST20 and ST30 constitute a reduction procedure and a variation procedure.

[Function and effect]
According to this embodiment, the following effects can be obtained.

  Since the detection unit 62 is provided, if dirt adheres to the drying unit 40, the dirt is automatically detected without stopping the operation of the paper making apparatus 11. Since this detection is sequentially performed even when the paper making apparatus 11 is in operation, the dirt attached to the drying unit 40 can be sufficiently suppressed by appropriately operating the reduction unit 50 manually or automatically based on the detection result.

  Since the control unit 61 is provided, the operation of the reduction unit 50 based on the detection result is automatically performed. Thereby, the complexity of dirt control can be reduced.

  Since the quantification unit 623 is provided, the operating state of the reduction unit 50 is changed according to the quantification value. Thereby, according to the grade of the stain | pollution | contamination adhering to the drying part 40, a stain | pollution | contamination can be suppressed appropriately. In addition, since it is possible to prevent the reduction unit 50 from operating more than necessary, the operating cost of the dirt suppression system 13 can be reduced.

  Since the determination unit 611 and the operation determination unit 613 are provided, the reduction unit 50 operates only when the quantitative value exceeds a predetermined value. Thereby, since the operating time of the reduction part 50 is reduced, the operating cost of the dirt suppression system 13 can be reduced more.

[Modification]
The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

  For example, in the above-described embodiment, the reducing unit 50 is configured by the inhibitor adding unit 51 and the roll cleaning unit 52. However, a device that blows off attached dirt using high-pressure water or compressed air may be provided. In addition, it is good also as a structure which makes a brush contact the canvas 42. FIG.

  In the embodiment, the operation determining unit 613 is provided so that the reduction unit 50 is activated when the quantitative value exceeds a predetermined value. However, the absolute value of the quantitative value is set regardless of the magnitude of the predetermined value. The operation of the reduction unit 50 may be adjusted in proportion. That is, the opening of the supply valve 514 is adjusted in proportion to the magnitude of the quantitative value, the output of the supply pump 513 is adjusted, and the distance between the surfaces of the scraper 521 and the first dryer roll 413 is adjusted. As a result, it is possible to suppress and prevent contamination of a predetermined level or less.

  In the above embodiment, the two photographing units 621a and 621b are provided. However, the present invention is not limited to this, and one or three or more may be provided. For example, one photographing unit may be provided, and the photographing unit may photograph the surface of the second dryer roll 415. Increasing the number of image capturing units can reduce the probability of occurrence of defects.

  Further, in the case of adopting the external addition method of the inhibitor, the above-described injection nozzle may be movable in the width direction of the dryer roll 41 and the canvas 42 (the depth direction in FIG. 1). Further, the position specifying unit as a position specifying unit for specifying the position where dirt is attached is provided in the detection unit 62, and the supply position adjusting unit as the supply position adjusting unit for moving the injection nozzle to the position specified by the position specifying unit is controlled. You may provide in the part 61. FIG. By comprising in this way, an inhibitor is mainly supplied about the position where dirt adhered, and adhesion of dirt can be effectively controlled with a small amount of inhibitor.

It is a schematic structure figure of a dirt control system concerning one embodiment of the present invention. It is a block diagram of the control means which comprises the dirt control system concerning the embodiment. It is a flowchart of the control means of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Paper making system 11 Paper making apparatus 13 Dirt suppression system 40 Drying part 50 Reduction part (reduction means)
61 Control unit (control means)
611 determination unit (determination means)
613 Operation determination unit (operation determination means)
62 Detection part (detection means)
623 Quantitative part (quantitative means)

Claims (8)

For a papermaking apparatus comprising a drying unit for drying wet paper, a soil suppression system that suppresses soiling attached to the drying unit,
Reducing means capable of reducing dirt adhering to the drying unit;
A paper making system comprising: detecting means for detecting dirt attached to the drying unit.   The dirt control system according to claim 1, further comprising a control unit that operates the reduction unit based on a detection result by the detection unit. The detection means has a quantification means for quantifying the degree of dirt attached to the drying unit,
The dirt control system according to claim 2, wherein the control unit includes a fluctuating unit that fluctuates an operating state of the reducing unit in accordance with a quantitative value by the quantitative unit.   The fluctuating means is a determining means for determining whether a quantitative value by the quantitative means exceeds a predetermined value, and an operation determining means for operating the reducing means when it is determined that the quantitative value exceeds the predetermined value. And the soil suppression system according to claim 3. For a papermaking apparatus including a drying unit for drying wet paper, a dirt suppressing method for suppressing dirt attached to the drying unit,
A detection procedure for detecting dirt adhering to the drying section;
And a reduction procedure for reducing dirt attached to the drying unit based on a detection result in the detection procedure. The detection procedure has a quantitative procedure for quantifying the degree of dirt attached to the drying unit,
The dirt reduction method according to claim 5, wherein the reduction procedure includes a fluctuation procedure that fluctuates a condition of the reduction procedure according to a quantitative value in the quantitative procedure.   The variation procedure includes a determination procedure for determining whether or not a quantitative value in the quantitative procedure exceeds a predetermined value, and an operation determination procedure for executing the reduction procedure when it is determined that the quantitative value exceeds the predetermined value. 7. The method for suppressing soiling according to claim 6.   A soil suppression method for suppressing soiling attached to the drying unit with respect to a papermaking apparatus provided with a drying unit for drying wet paper, the soiling suppressing method including a monitoring procedure for monitoring presence or absence of soiling attached to the drying unit.

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