JP2010013776A - Apparatus for regulating amount added of additive for size press liquid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for regulating the amount added of an additive for a size press liquid designed to feed a required amount of the size press liquid for each surface, and make the additive contained in the liquid as an adequate amount because there is a case where the required amount of the size press liquid for coating paper is different between the front and rear sides of the paper. <P>SOLUTION: A surface treating liquid fed from a size liquid diluting tank 13 and the additive fed from an additive receiving tank 20 are separately fed to vibrating screens 9a and 9b of a feeding line for feeding the size press liquid to each of the front and rear sides of the paper P. Flow rate sensors 28d and 29d are installed in feeding passages 14a and 14b for the surface treating liquid which is a paste diluted liquid comprising starches as a main component, and measured signals thereof are sent out to flow rate regulators 28c and 29c. Flow rate sensors 28b and 29b are installed in feeding passages 27a and 27b for the additive, and measured signals thereof are sent out to the flow rate regulators 28c and 29c. The amount of the additive corresponding to the amount of the surface treating liquid is determined with the flow rate regulators 28c and 29c. The opening of regulating valves 28a and 29a is regulated to feed the adequate amount of the additive to the vibrating screens 9a and 9b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an additive such as a sizing agent to be mixed in a size press solution when a size press solution is applied to a paper surface in a paper making process, in a size press part of a paper machine, or in a coating machine for finishing. In particular, a size press liquid additive suitable for supplying a size press liquid to each of the front and back of a paper in a size press. The present invention relates to an addition amount adjusting device.

  In the papermaking process, depending on the type of papermaking, a size press solution is applied in order to ensure the smoothness of the paper surface and to improve the printability. For the size press liquid, a surface treatment liquid mainly composed of starch, PVA (polyvinyl alcohol), PAM (polyacrylamide) or the like is used, and as starch, oxidized starch, hydroxyethyl (ether) starch, Cationized starch or the like is used. Further, as required, a size press liquid mixed with additives for adjusting paper quality and the like is applied to the paper.

  FIG. 2 is a diagram of a conventional supply system of a size press liquid for application to paper, and shows an outline of what is applied to the paper P running the size press liquid by a gate roll coater. The paper P passes through the applicator rolls 1a and 1b while being sandwiched between the pair of rotating applicator rolls 1a and 1b. Inner rolls 2a and 2b are disposed on the opposite side of the applicator rolls 1a and 1b with respect to the paper P, that is, outside, and rotate while contacting the applicator rolls 1a and 1b, respectively. Outer rolls 3a and 3b are disposed outside these inner rolls 2a and 2b, and rotate while contacting the inner rolls 2a and 2b, respectively. The applicator roll 1a contacts the felt side surface (front surface) of the paper P, and the applicator roll 1b contacts the wire side surface (back surface). The size press liquid is supplied to the size press liquid supply units 4a and 4b by the respective contact between the inner rolls 2a and 2b and the outer rolls 3a and 3b, and the respective surfaces of the applicator rolls 1a and 1b from the inner rolls 2a and 2b. And applied to the paper P from these applicator rolls 1a and 1b.

  The size press liquid supply sections 4a and 4b are supplied from the front side size press liquid supply path 5a and the back side size press liquid supply path 5b, respectively. The discharge sides of the size press liquid feed pumps 7a and 7b are connected to the size press liquid supply paths 5a and 5b via strainers 6a and 6b, respectively. A front-side size press liquid tank 8a and a back-side size press liquid tank 8b are connected to the suction sides of the size press liquid feed pumps 7a and 7b, respectively. That is, the size press liquid supply unit 4a is supplied with the size press liquid supply pump 7a from the front side size press liquid tank 8a, and the size press liquid supply unit 4b is supplied with the size press liquid supply pump 7b through the back side size press liquid tank 8b. The size press liquid is supplied from each. Further, the size press liquid is supplied to the front side size press liquid tank 8a via the vibration screen 9a and the back side size press liquid tank 8b via the vibration screen 9b. Furthermore, surplus size press liquid that is not accompanied by the inner rolls 2a and 2b among the size press liquid supplied to the size press liquid supply units 4a and 4b passes through the recovery passages 10a and 10b. The reject liquid removed by the strainers 6a and 6b is returned through the return paths 11a and 11b. Each of the vibration screens 9a and 9b is supplied with hot water for diluting the size press liquid while raising the temperature. The vibrating screens 9a and 9b remove the impurities and large size sizing agents and additives contained in the size press liquid and maintain the size press liquid state suitable for coating.

  The surface treatment liquid in the paste liquid dilution tank 13 is supplied to the vibrating screens 9a and 9b by the surface treatment liquid feed pump 13a. That is, the surface treatment liquid supply path 14 connected to the discharge side of the surface treatment liquid feed pump 13a has a surface side surface treatment liquid supply path 14a connected to the vibrating screen 9a for sieving the surface treatment liquid. The backside treatment liquid supply passage 14b is connected to the vibration screen 9b through which the backside treatment liquid is sieved, and the respective vibration screens are connected via the respective surface treatment liquid supply passages 14a and 14b. 9a and 9b are supplied.

  The paste liquid dilution tank 13 is supplied with the paste liquid, the additive, and the hot water and mixed. On the other hand, fresh water and starches are supplied to the dissolution tank 16 and mixed, and a starch dispersion having an appropriate concentration is fed to the cushion tank 17 by the starch dispersion feed first pump 16a. The starch dispersion liquid stored in the cushion tank 17 is fed to the gelatinizer 18 by the starch dispersion feed second pump 17a. Steam is supplied to the gelatinizer 18 together with fresh water, and the starch dispersion liquid is gelatinized by raising the temperature, and the gelatinized paste liquid is fed to the paste liquid tank 19 and stored. Then, the paste liquid stored in the paste liquid tank 19 is fed to the paste liquid dilution tank 13 by the paste liquid feed pump 19a. The paste dilution tank 13 is supplied with the additive stored in the additive receiving tank 20 by the additive feed pump 20a and is also supplied with hot water.

  In the conventional size press liquid supply flow shown in FIG. 2, when the amount of size press liquid necessary for ensuring quality such as printability is different between the front and back sides of the paper P, the amount of additive added is excessive on one side. There is a problem that becomes. That is, since the size press liquid is fed from the paste liquid dilution tank 13 to the vibrating screens 9a and 9b by the surface treatment liquid feed pump 13a, both the vibrating screens 9a and 9b are supplied with paste liquid and additives. A surface treatment liquid having a constant ratio is supplied. On the other hand, in order to apply the size press liquid amount necessary to ensure the printability and other quality on the front and back sides of the paper P, the amount of the hot water for dilution on each side is changed by the vibration screens 9a and 9b, and the size press liquid concentration Is adjusted. In this case, on one side, when adjusting to the size press liquid concentration necessary for ensuring quality such as printability, more additives than necessary are also applied at the same time. In particular, since many additives are expensive, an excessive amount of the additive causes an increase in cost.

  For example, in Patent Document 1, in order to give a concentration difference between the sizing liquid concentration on one side of the paper and the sizing liquid concentration on the opposite side, hot water for dilution of 30 ° C. or higher, a flow controller for hot water, and a stirring mixer A paper surface size coating apparatus having a size liquid concentration adjusting device is disclosed. Further, in Patent Document 2, a surface treatment agent adjusting device that adjusts the surface treatment agent applied to the front side of the base paper to a predetermined concentration and a surface treatment agent applied to the back side of the base paper are adjusted to a predetermined concentration. And a surface treatment agent tank for supplying the surface treatment agent to the surface side of the base paper, and a surface treatment for supplying the surface treatment agent to the back side of the base paper The surface treatment agent having a predetermined concentration can be supplied from the surface treatment agent adjusting device for the base paper surface side to the surface treatment agent tank for the base paper surface side, and the base paper back side can be supplied. The surface treatment agent of a predetermined concentration can be supplied from the surface treatment agent adjusting device to the surface treatment agent tank for the back side of the base paper, and the coating amount of the surface treatment agent is individually changed between the surface and the back side of the base paper. And the surface of the base paper The surface treatment agent overflowed in step 1 is returned to the surface treatment agent tank for the base paper surface side, and the surface treatment agent overflowed on the back side of the base paper is returned to the surface treatment agent tank for the base paper back side. A manufacturing method is disclosed.

Japanese Patent No. 2954985 Japanese Patent No. 3794575

  The coating liquid adjusting devices disclosed in Patent Document 1 and Patent Document 2 both adjust the starch concentration, and include starch-based surface treatment liquids and additives contained in the size press liquid. The amount of addition is not adjustable. As described above, there are many expensive additives to be added to the size press liquid. If the additive amount can be adjusted, the cost of the size press liquid can be significantly reduced.

  Therefore, the present invention adjusts the coating amount on the front and back surfaces of the paper and the additive amount to an appropriate amount so that the additive amount for adjusting the size press liquid can be adjusted reliably. It is an object of the present invention to provide an apparatus for adjusting the amount of additive for size press liquid that can reduce the cost.

  As a technical means for achieving the above object, the apparatus for adjusting the amount of additive for size press solution according to the present invention is adjusted by adding an additive such as a sizing agent to a surface treatment solution mainly composed of starch or the like. In a size press liquid additive addition amount adjusting device that adjusts the surface of the paper by individually applying the size press liquid to the front and back surfaces of the running paper, the surface treatment liquid is applied to the front and back surfaces of the paper surface. A surface treatment liquid supply system for supplying the additive, an additive supply system for supplying the additive to each of the front and back surfaces of the paper surface, one of the surface treatment liquid supply system and the additive supply system. A first size press liquid supply system that joins one side, and a second size press liquid supply system that joins the other of the surface treatment liquid supply system and the other of the additive supply system, Additive By adjusting the amount of additive to be supplied from the supply system to each of the surface treatment liquid supply systems, the respective surfaces on the front and back sides of the paper from the first size press liquid supply system and the second size press liquid supply system It is characterized in that a size press liquid is applied.

  That is, the size press liquid supply system applied to the front and back surfaces of the paper is separated for each surface, and the surface treatment liquid supply system and additive supply system are separated into each size press liquid supply system. Are made to merge. The supply amounts of the surface treatment liquid and the additive are adjusted at the time of merging. For this reason, on the front and back surfaces of the paper, the amount of size press liquid to be applied is different, and the amount of additive contained in the size press liquid is also different, and the necessary size press liquid is supplied to each of the front and back surfaces. be able to.

  The additive for adjusting the amount of additive for size press liquid according to the invention of claim 2 is configured such that the amount of additive added from the one additive supply system to the one surface treatment liquid supply system The amount of the additive added from the other additive supply system to the other surface treatment liquid supply system is adjusted according to the amount of the surface treatment liquid flowing through the surface treatment liquid supply system. It is characterized by adjusting according to the amount of the surface treatment liquid flowing through the system.

  That is, the amount of the additive is adjusted according to the amount of the surface treatment liquid in which the additive is mixed. The flow rate of the surface treatment liquid supply system of the surface treatment liquid is measured, and an amount of additive corresponding to the measured value is merged from the additive supply system.

  Further, the additive for adjusting the amount of additive for size press liquid according to the invention of claim 3 is the upstream side of the size press liquid tank for storing the size press liquid disposed in each of the size press liquid supply systems. The surface treatment liquid supply system and the additive supply system are merged with each other.

  It is necessary to mix the surface treatment liquid and the additive as uniformly as possible. On the other hand, in order to stably supply the size press liquid to the paper, it is desirable that the size press liquid is retained in a tank or the like and supplied from the tank or the like. If the surface treatment liquid and the additive are mixed in the tank or the like, they are almost uniformly mixed.

  According to a fourth aspect of the present invention, there is provided an apparatus for adjusting the amount of an additive for size press liquid, which is disposed on the upstream side of the size press liquid tank, and the additive is applied to a vibrating screen for selecting a surface treatment liquid through a sieve. A supply system is connected, and in the vibrating screen, the surface treatment liquid and the additive are mixed and supplied to the size press liquid tank.

  It is inconvenient if the size press liquid applied to the paper contains impurities, large particles of starch, additives and the like. For this reason, a size press liquid is sieved with a vibrating screen to remove impurities and large particles. Therefore, the surface treatment liquid and the additive are combined when supplied to the vibrating screen. In the vibrating screen, impurities are removed and particles are selected while the surface treatment liquid and the additive are mixed almost uniformly.

  According to the apparatus for adjusting the amount of additive for size press liquid according to the present invention, the amount of additive contained in the size press liquid to be applied to the front and back surfaces of the paper can be varied. The required amount of size press fluid can be supplied to each of the surfaces. For this reason, generation | occurrence | production of an excessive size press liquid can be suppressed and the reduction in the cost in a coating process can be aimed at.

  Further, according to the apparatus for adjusting the amount of additive for size press liquid according to the invention of claim 2, an appropriate amount of additive can be added according to the surface treatment liquid, so that an excessive amount of additive is added. Can be further reduced, and cost efficiency can be reduced and quality can be optimized.

  According to the apparatus for adjusting the amount of additive for size press liquid according to the invention of claim 3, the surface treatment liquid and the additive are appropriately mixed, and the uniform size press liquid is applied to the paper. be able to.

  Furthermore, according to the apparatus for adjusting the amount of additive for size press liquid according to the invention of claim 4, the surface treatment liquid and the additive in the size press liquid can be reliably mixed, and more uniform. Can do.

  Hereinafter, based on the preferred embodiment shown in FIG. 1, an apparatus for adjusting the amount of additive for size press liquid according to the present invention will be described in detail. FIG. 1 is a system diagram of a size press liquid supply system in an addition amount adjusting apparatus according to the present invention. A part of the system corresponds to FIG. 2 and is the same as the equipment and apparatus shown in the system diagram of FIG. The same reference numerals are assigned to the devices and apparatuses.

  In this additive amount adjusting device, the additive supply path 27 connected to the discharge side of the additive feed pump 26 for feeding the additive in the additive receiving tank 20 is bifurcated in two directions, and one surface is The side additive supply path 27a is connected to the vibration screen 9a, and the other back side additive supply path 27b is connected to the vibration screen 9b. That is, an additive is separately supplied from the additive receiving tank 20 to each of the vibrating screens 9a and 9b, and the additive supply system is connected by a path from the additive receiving tank 20 to the vibrating screens 9a and 9b. Is configured.

  Each of the additive supply paths 27a and 27b is provided with a front surface side flow rate adjusting means 28 and a back surface side flow rate adjusting means 29. Each of these flow rate adjusting means 28, 29 includes flow rate adjusting valves 28a, 29a, flow rate sensors 28b, 29b, flow rate adjusters 28c, 29c, and flow rate sensors 28d, 29d. The flow rate sensors 28d and 29d measure the flow rates of the respective surface treatment liquids flowing through the front surface side surface treatment liquid supply path 14a and the back surface side surface treatment liquid supply path 14b, and the measurement signals are respectively sent to the flow rate controllers 28c and 29c. To send. The flow rate sensors 28b and 29b measure the flow rate of the additive flowing through the additive supply paths 27a and 27b, and send the measurement signals to the flow rate controllers 28c and 29c. The flow rate regulators 28c and 29c are configured to adjust the flow rate adjusting valves 28a and 28c so that an amount of the additive according to the flow rate of the surface treatment liquid sent from the flow rate sensors 28d and 29d flows through the additive supply passages 27a and 27b. Adjust the opening of 29a. At this time, the opening degree of the flow rate adjusting valves 28a and 29a is adjusted while checking the flow rate of the additive sent from the flow rate sensors 28b and 29b.

  Further, no additive is supplied to the paste liquid dilution tank 13, and the surface side surface treatment liquid supply path 14a and the back surface side surface treatment are supplied from the surface treatment liquid feed pump 30 to each of the vibrating screens 9a and 9b. A paste solution dilution as a surface treatment solution is supplied through each of the solution supply paths 14b. Further, in each of these surface treatment liquid supply paths 14a, 14b, adjustment valves 31a, 31b are provided on the downstream side of the flow rate sensors 28d, 29d, and the opening degree of these adjustment valves 31a, 31b is adjusted. Thus, the flow rate of the surface treatment liquid is adjusted. A surface treatment liquid supply system is configured by a path from the dissolution tank 16 to the vibrating screens 9a and 9b via the paste liquid tank 19 and the paste liquid dilution tank 13.

  A first size press liquid supply system and a second size press liquid supply system are configured by the respective paths from the vibrating screens 9a, 9b to the size press liquid supply units 4a, 4b.

  In the apparatus for adjusting the amount of additive for size press liquid according to the present invention configured as described above, the surface treatment liquid and the additive are separately supplied to the vibrating screens 9a and 9b and mixed in the vibrating screens 9a and 9b. The That is, the surface treatment liquid is supplied to the vibrating screens 9a and 9b from the paste solution dilution tank 13 via the surface side surface treatment liquid supply path 14a and the back surface treatment liquid supply path 14b by the surface treatment liquid feed pump 30, respectively. In addition, the additive is supplied to the vibrating screens 9a and 9b by the additive feed pump 26 via the front-side additive supply path 27a and the back-side additive supply path 27b.

  Further, the flow rate of the surface treatment liquid flowing through the surface side surface treatment liquid supply path 14a is adjusted by adjusting the opening of the adjustment valve 31a disposed in the surface side surface treatment liquid supply path 14a. Then, an appropriate amount is adjusted to be supplied according to the surface of the paper P to which the size press liquid is applied. Further, the flow rate of the surface treatment liquid is measured by the flow rate sensor 28d, and the measurement signal is sent to the flow rate controller 28c. In the flow rate controller 28c, the additive amount corresponding to the flow rate of the surface treatment liquid is obtained based on a preset value. Since the amount of additive flowing through the surface side additive supply path 27a is measured by the flow rate sensor 28b, the opening degree of the flow rate adjusting valve 28a is adjusted so that the measured value becomes equal to the added amount. As a result, the surface treatment liquid and the additive are supplied to the vibrating screen 9a at a desired ratio. Similarly, the opening degree of the regulating valve 31b is adjusted so that an appropriate amount of the surface treatment liquid corresponding to the back surface of the paper P is applied to the vibrating screen 9b, and the flow regulating valve 29a is adjusted by the flow regulator 29c. By adjusting the opening, the surface treatment liquid and the additive are supplied at a desired ratio.

  The surface treatment liquid and the additive supplied to the vibrating screens 9a and 9b are passed through the vibrating screens 9a and 9b to be screened to remove impurities and to be applied to the paper P. It will be in a suitable state. Further, the surface treatment liquid and the additive are almost uniformly mixed by passing through the vibrating screens 9a and 9b.

  The size press liquid generated by mixing the surface treatment liquid and the additive in the vibrating screens 9a and 9b is stored in the size press liquid tanks 8a and 8b. In the same manner as described above, the size press liquid feed pumps 7a and 7b are supplied to the size press liquid supply units 4a and 4b via the strainers 6a and 6b, and the paper P is fed from the applicator rolls 1a and 1b. It is applied to both front and back surfaces.

  The size press liquid supplied to each of the size press liquid supply units 4a and 4b is set to an appropriate amount according to the paper surface of the paper P, and the additive contained in the size press liquid is also necessary and sufficient amount. It is said that.

  In addition, the excessive size press liquid which is not apply | coated to the paper P is collect | recovered by the said vibration screens 9a and 9b via the collection paths 10a and 10b. Further, the reject liquid of the strainers 6a and 6b is supplied to the vibrating screens 9a and 9b through the return paths 11a and 11b.

  In the embodiment described above, the surface treatment liquid supply system and the additive supply system have been described as being combined in the vibration screens 9a and 9b, but the joining point of these surface treatment liquid supply system and additive supply system If it is a position which can adjust the addition amount of an additive, it may be another location.

  According to the apparatus for adjusting the amount of the additive for size press liquid according to the present invention, the amount of the size press liquid to be applied to the paper can be optimally adjusted. In addition to reducing the waste of expensive additives, the cost of the size press liquid is reduced and the quality gap is reduced.

It is a figure explaining the supply system of the size press liquid of the addition amount adjustment apparatus of the additive for size press liquid concerning this invention. It is a figure explaining the supply system of the conventional size press liquid.

Explanation of symbols

P paper
1a, 1b applicator roll
2a, 2b Inner roll
3a, 3b Outer roll
4a, 4b size press liquid supply section
5a Surface side size press liquid supply path
5b Back side size press liquid supply path
6a, 6b strainer
7a, 7b size press liquid feed pump
8a Surface side size press liquid tank
8b Back side size press liquid tank
9a, 9b vibrating screen
10a, 10b Recovery path
11a, 11b return path
13 Paste dilution tank
13a Surface treatment liquid feed pump
14 Surface treatment liquid supply path
14a Surface side surface treatment liquid supply path
14b Backside surface treatment liquid supply path
16 Dissolution tank
16a Starch dispersion feed pump 1
17 Cushion tank
17a 2nd pump for starch dispersion
18 Pasting equipment
19 Paste tank
19a Paste feed pump
20 Additive receiving tank
20a Additive feed pump
26 Additive feed pump
27 Additive supply path
27a Surface side additive supply path
27b Backside additive supply path
28 Surface side flow rate adjustment means
28a Flow control valve
28b Flow sensor
28c Flow controller
28d flow sensor
29 Back side flow rate adjustment means
29a Flow control valve
29b Flow sensor
29c Flow controller
29d flow sensor
30 Surface treatment liquid feed pump
31a, 31b Regulating valve

Claims (4)

A size press solution that adjusts the surface of the paper by applying a size press solution prepared by adding an additive such as a sizing agent to the surface treatment solution mainly composed of starch, etc., on the front and back surfaces of the running paper. In the additive addition amount adjustment device for
A surface treatment liquid supply system for supplying the surface treatment liquid to each of the front and back surfaces of the paper surface;
An additive supply system for supplying the additive to each of the front and back surfaces of the paper surface;
A first size press liquid supply system that merges one of the surface treatment liquid supply system and one of the additive supply system;
A second size press liquid supply system that joins the other of the surface treatment liquid supply system and the other of the additive supply system;
From the first size press liquid supply system and the second size press liquid supply system, the amount of additive added from the respective additive supply system to the respective surface treatment liquid supply system is adjusted. An apparatus for adjusting the amount of an additive for size press liquid, wherein a size press liquid is applied to each of the front and back surfaces.   The amount of additive added from the one additive supply system to the one surface treatment liquid supply system is adjusted according to the amount of the surface treatment liquid flowing through the one surface treatment liquid supply system, and the other addition The additive amount of the additive from the agent supply system to the other surface treatment liquid supply system is adjusted according to the amount of the surface treatment liquid flowing through the other surface treatment liquid supply system. A device for adjusting the amount of the additive for size press liquid described.   The surface treatment liquid supply system and the additive supply system are respectively merged upstream of a size press liquid tank that stores a size press liquid disposed in each of the size press liquid supply systems. Item 3. An apparatus for adjusting the amount of additive for size press liquid according to Item 1 or Item 2.   The additive supply system is connected to a vibrating screen that is disposed upstream of the size press liquid tank and screens and screens the surface treatment liquid, and the surface treatment liquid and the additive are mixed in the vibration screen. The additive for adjusting the amount of additive for size press solution according to claim 3, wherein the device is supplied to the size press solution tank.

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