JP4792131B1 - Manufacturing method and manufacturing apparatus for tissue-coated tissue paper - Google Patents

Abstract

[PROBLEMS] To efficiently remove paper powder mixed in a chemical solution when the chemical solution is coated and used in circulation, stabilize the viscosity of the coating solution, and suppress variations in the coating amount. Apparatus and methods are provided.
An apparatus is configured to apply a chemical solution on a plate cylinder 64A while being placed on a tissue paper sheet S2 running between an impression cylinder 65B and a plate cylinder 64A by a flexographic printing method or a gravure printing method. The printing plate cleaning means 100 having a cleaning head facing the plate cylinder 64A and not in contact with the plate cylinder 64A is provided, and a high-pressure fluid is ejected and the paper powder separated from the printing surface is sucked. Remove paper dust adhering to the plate.
[Selection] Figure 4

Description

  The present invention relates to a manufacturing apparatus and a manufacturing method having a mechanism for removing paper powder mixed in a chemical liquid and paper powder adhering to the chemical liquid application apparatus in the manufacturing process of the chemical-coated tissue paper.

A tissue paper called a lotion type, in which a chemical such as a moisturizing agent or a softening agent is applied to the surface, is well known (Patent Document 1).
In producing such chemical-coated tissue paper, moisturizers mainly composed of softeners and glycerin are expensive, and their disposal needs to be minimized considering the impact on the environment. In order to make the use efficiency of the chemical solution in the process as high as possible, it is common to perform the so-called circulation use of the chemical solution in which the excess chemical solution that has not been applied is collected and used again in the application step.
However, in the manufacturing process of tissue paper, which is also referred to as lotion type by applying chemicals such as moisturizers and softeners, the powder collected from the application process is mixed with paper powder that has been released from the paper sheet and scattered, As the amount of paper powder in the coating solution increases as the coating time elapses, the viscosity of the coating solution increases and the coating amount increases, resulting in large variations in the coating amount in the coating width direction and flow direction. It was.

Japanese Patent Laid-Open No. 4-9121

  Therefore, the main problem of the present invention is to efficiently remove paper dust mixed in the chemical solution in the manufacturing process of the chemical-coated tissue paper, and as a result, stabilize the viscosity of the coating solution and suppress variation in the coating amount. It is to provide an apparatus and method that can. It is another object of the present invention to provide an apparatus and method for removing paper dust adhering to or remaining in a chemical liquid coating apparatus.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A chemical solution application step of applying a chemical solution while placing the chemical solution on the plate surface of the plate cylinder by flexographic printing method or gravure printing method on a tissue paper base paper that runs between the impression cylinder and the plate cylinder; and
A chemical solution recovery step for solid-liquid separation of the collected chemical liquid into paper powder and chemical liquid, and integrally mixing the chemical liquid together with the stock solution of the chemical liquid to supply the chemical liquid application means;
Air containing paper dust removed from the plate surface at the same time by spraying a fluid mixed with air and water onto the plate surface by a cleaning means provided at a position facing the plate surface of the plate cylinder and not in contact with the plate surface And a surface cleaning process for sucking a mixture of water,
The manufacturing method of the chemical | medical solution containing tissue paper containing this.

(Function and effect)
When applying a chemical solution, such as a moisturizing agent or a softening agent, to tissue paper, a roll transfer method such as a flexographic printing method or a gravure printing method, or a non-contact type coating method such as a spray coating or an inkjet method, Alternatively, any known coating method such as dipping can be used. However, the total amount of chemicals at the time of application is not applied to the tissue paper base by any of the application methods, and each roll in the printing method such as a dipping tank, plate, anilox roll or dip roll, prevents the applied chemical from splashing. The uncoated chemical solution remains on the shielding plate or the like, and the uncoated chemical solution is mixed into the coated chemical solution. Chemical liquids are not cheap, and even if waste liquids are used, there is an environmental impact due to waste liquid treatment. Therefore, it is desirable to recover the uncoated chemical solution and apply it again.

  When the chemical solution is applied by spray application, the application amount tends to vary in the width direction and the flow direction. In this respect, the flexographic printing method and the gravure printing method have an advantage that the coating amount can be stably applied in the width direction and the flow direction.

  However, in roll transfer systems such as flexographic printing and gravure printing, when the chemical solution is applied at a high speed with a plate or roll, the paper powder released from the tissue paper base due to its surface tension is reversely transferred to the plate or roll. Mix in the remaining chemicals. If the recovered unapplied chemical solution is continuously reused, the viscosity of the chemical solution gradually increases as the paper powder content increases, and the amount applied to the tissue paper base increases. There was a problem that the dispersion of the coating amount became large. In addition, in the case of flexographic printing and gravure printing, it can cause clogging of the plate, and since the effect of the paper dust adhering to the increase in the amount of partial coating is not stable, uniform coating is required. There was a problem of obstructing.

  The present invention solid-separates the paper powder-containing chemical liquid containing the recovered uncoated chemical liquid, the paper powder content is finally out of the system, and the separated chemical liquid content is used as the coating liquid. It is possible to suppress the mixing of paper powder into the liquid.

  In both the flexographic printing method and the gravure printing method in which the chemical solution is applied, the chemical solution contained in the container is applied to the tissue paper base paper. However, since it is desirable that the viscosity of the applied chemical solution be as constant as possible, it is desirable to provide a first circulation path for separately providing a storage tank and circulating the chemical solution to and from the chemical solution application apparatus.

  Further, from this first circulation path, the paper powder-containing liquid is preferably extracted from the storage tank and separated into solid and liquid, and the separated chemical solution is returned to the storage tank, preferably to the storage tank. When the second circulation path is provided, the removal of paper dust can be continuously removed by the solid-liquid separation means in the second circulation path, so that the content of the paper dust does not increase in the first circulation path over time. Therefore, the coating can be performed with a stable coating amount.

  On the other hand, in the flexographic printing system, paper dust adheres to the surface of the plate convex portion of the plate cylinder that receives the chemical solution from the anilox roll and is applied to the sheet, or the paper concave portion is clogged with paper dust. In this way, there is a problem that the paper dust adheres to the plate and becomes uneven due to clogging that partially or affects the quality.

  Also, the paper powder is transferred from the plate surface to the anilox roll surface, and further transferred from the anilox roll surface to the chemical solution in the chamber, or the paper powder is transferred to the dip roll surface and finally the paper powder moves to the chemical solution tank. .

  Then, as the concentration of paper powder in the chemical increases, the viscosity of the applied chemical increases, and the amount of application from the plate to the paper tends to increase as the application time elapses. Further, when the viscosity of the chemical solution increases, the chemical solution is less likely to be transferred uniformly between the rolls in the width direction, and thus the variation in the coating amount in the width direction increases.

  Similarly in the gravure printing method, paper powder is clogged in the concave portion of the plate cylinder which receives the chemical solution and is applied to the sheet, and as a result, the viscosity of the chemical solution is increased. Variations in the coating amount will occur.

  As a method for removing paper dust adhering to the concave portion of the copper plate, cleaning by human hands has been performed. Cleaning by human hands is dangerous when performed while driving, so the operation of the manufacturing apparatus must be stopped. Regardless of human hands, scraping methods are also possible by bringing a brush or blade into contact with the plate surface, but in these methods, problems such as equipment contamination due to scattering of the removed paper powder and reattachment to the sheet There are a number of problems such as a problem of brush hair falling off and an increase in equipment cost due to blade wear.

  In the present invention, in the plate cylinder that finally transfers and applies the chemical solution to the sheet, a cleaning means is provided so as to face the plate surface and not to come into contact with the plate surface of the high-pressure fluid (a mixture of air and water). By simultaneously spraying air and sucking air and water containing the removed paper powder, the clogging of the plate surface recess due to the paper powder in the chemical solution is prevented. In such a configuration, since the plate surface and the cleaning means do not come into contact with each other, wear does not occur, and most of the removed paper dust is immediately removed by suction by the suction means. Can be reduced. In addition, since the quantity of the chemical | medical solution attracted | sucked is small, it is desirable to discard, without collect | recovering and using for a chemical | medical solution application means.

  The fluid ejected toward the printing surface in the cleaning means is a mixed fluid of air and water. It is difficult to completely remove adhesive chemicals with air alone. Compared to the case of water alone, the mixed fluid of air and water has the effect of expanding under atmospheric pressure when air compressed in water is ejected from the ejection port. It has the advantage of hitting the surface at high speed. Further, due to the difference in specific gravity between air and water, fine vibration can be given to the ejected printing surface, and a higher cleaning effect can be achieved. Here, as a substitute for water, use of a solvent, a cleaning liquid or the like is not suitable. This is because when the solvent remaining on the printing surface is mixed into the coating chemical, the physical properties of the chemical change, which may affect the operability of the coating apparatus and the quality of the manufactured product.

  As will be described later, in the case of applying at a particularly high speed, the flexographic printing method is preferable, and the flexographic printing method using a doctor chamber is particularly preferable. In the flexographic printing system at high speed, we know that the degree of paper dust mixing in uncoated chemicals and the adhesion of paper dust to the printing plate is large, and the paper dust removing means of the present invention can be effectively applied. .

  The present invention efficiently removes the paper powder mixed in the chemical liquid when circulating the uncoated chemical liquid collected from the chemical liquid application means, and mixes it with the chemical liquid by cleaning the printing plate to which the paper powder easily adheres. By reducing the amount of paper powder to be used, the chemical solution applied to the sheet can be more reliably maintained constant.

<Invention of Claim 2>
The manufacturing method of the chemical | medical solution containing tissue paper of Claim 1 which makes the said tissue paper base paper run up and down between an impression cylinder and a plate cylinder, and provides the said cleaning means under the plate cylinder.

(Function and effect)
Since the paper dust-containing liquid is removed from the plate cylinder by providing a cleaning means below the plate cylinder, the paper powder-containing liquid removed from the high-pressure fluid (air and / or liquid) can be prevented from rolling up and scattering, Thus, adhesion to the sheet can be prevented.

<Invention of Claim 3>
The manufacturing method of the chemical | medical solution containing tissue paper of Claim 1 or 2 whose said cleaning means is a cleaning head which reciprocates at a fixed speed in the width direction of the said plate cylinder.

(Function and effect)
The cleaning means can be provided over the entire width of the plate cylinder. In that case, in order to inject the high-pressure fluid onto the plate surface, a large amount of water is required, and the treatment of the water after suction becomes complicated. Also, the amount of paper dust that needs to be removed is not so large as to require injection of high-pressure fluid over the entire width at all times. Therefore, in order to increase the efficiency of processing after jetting and suction, it is preferable that the cleaning means is a cleaning head that reciprocates at a constant speed in the plate cylinder width direction.

<Invention of Claim 4>
A chemical solution applying means for applying a chemical solution while placing the chemical solution on the plate surface of the plate cylinder by flexographic printing method or gravure printing method on the tissue paper base paper running between the impression cylinder and the plate cylinder;
A chemical recovery unit for solid-liquid separation of the recovered chemical into a paper powder and a chemical component, and the chemical solution is integrally mixed with a stock solution of the chemical solution and supplied to the chemical application unit;
Cleaning means provided at a position facing the plate surface of the plate cylinder and not in contact with the plate surface;
The cleaning means is configured to inject a fluid in a state of mixing air and water onto the plate surface and simultaneously suck a mixture of air and water including paper dust removed from the plate surface. Tissue paper manufacturing equipment.

  According to the present invention, in the plate cylinder that finally transfers and applies the chemical liquid to the sheet, the cleaning means having the high-pressure fluid ejecting means and the suction means is provided opposite to the plate surface of the plate cylinder, and the chemical liquid containing paper dust is provided. Since it is configured to be removed from the plate surface of the plate cylinder, it is possible to prevent clogging of paper powder in the chemical solution on the plate surface of the plate cylinder. In addition, as a result of efficiently removing paper dust mixed in the chemical liquid, the viscosity of the coating liquid can be stabilized and variation in the coating amount can be suppressed.

It is a flowchart which shows an example of the chemical | medical solution coating device which concerns on this invention, the paper dust removal apparatus of chemical | medical solution, and piping. It is a flowchart which shows the other example of the chemical | medical solution coating device which concerns on this invention, the paper dust removal apparatus of chemical | medical solution, and piping. It is a front view which shows the outline | summary of a printing plate cleaning means. It is a side view which shows the outline | summary of a printing plate cleaning means. It is a top view of the cleaning head of the printing plate cleaning means. It is an outline explanatory view of an example of chemical solution application with a ply machine. It is the schematic which shows an example of the apparatus which concerns on flexo application | coating. It is the schematic which shows an example of the apparatus which concerns on gravure coating. It is the schematic which shows the cross section of the cleaning head of a printing plate cleaning means.

(Example of chemical solution coated tissue manufacturing process)
In FIG. 6, the example of the manufacturing process of the tissue paper obtained by apply | coating a chemical | medical solution in a ply machine is shown.
The base paper produced by the paper machine is creped as a continuous sheet, calendered, and wound up to form a primary raw roll JR (generally also called jumbo roll).
The continuous sheets S <b> 11 and S <b> 12 are laminated by a laminating roller 51 to form two plies, and are calendered by a ply machine calender 52 as needed, and sent to the chemical solution applying means 53. It is preferable that the chemical solution is applied only from one side of each ply, and the surfaces to which the chemical solution is not applied are overlapped, and the ply is fixed later. Any known coating method such as flexographic coating or gravure coating can be used as the chemical coating method.

  It is preferable that the two-ply continuous sheet coated with the chemical solution is provided to the contact embossing roller 54B and the roller roll 54A and fixed by performing a contact embossing (knurling) process. The contact embossing is preferably applied uniformly in the vertical direction with a width of 1 to 10 mm at positions of 1/10 to 1/20 with respect to the paper width from both sides. Any of the known methods, such as fixing the ply with an adhesive, may be used. However, when using an adhesive, there is a problem that the touch tends to become hard, and it is easy to peel off when applying a chemical solution. It can be said that the use of embossing is more preferable.

  A continuous sheet of 2 plies with contact embossing is directly cut into a product size after being subjected to folding processing by being directly applied to a rotary interfolder or the like, or after being cut into a product width by a slitter 55, The winding material is taken up by the winding drum 56 as a secondary roll roll R, folded, and stored in a paper box.

  In addition, although the structure which provides a chemical | medical solution before contact embossing is taken in this form, it is good also as a structure which provides a chemical | medical solution after contact embossing.

  The secondary raw roll described above is subjected to a folding process particularly in tissue paper products. As the folding process, a known method such as a rotary interfolder or a multi-stand interfolder can be used, but it is more preferable to use a multi-stand interfolder with high productivity.

  In addition, although the manufacturing process of the tissue paper of 2 plies was illustrated, the chemical | medical solution supplied from the paper dust removal apparatus in the chemical | medical agent based on this invention can be used effectively also in another manufacturing process, Said manufacture It is not limited to use in the process.

(Chemical solution application process-example of flexo application)
Any known coating means can be used as the chemical solution coating step, but it is preferable to use a printing method such as gravure coating or flexographic coating that uniformly applies the chemical solution to the entire coated surface.
Of the chemical solution application process, it is more preferable to use a flexo coater equipped with a doctor chamber 61, because the chemical solution can be supplied in a stable application amount.

  6 and 7 show an example of a doctor chamber type in the flexographic printing method. As shown in FIG. 7, the chemical solution application unit 53A in the form of one of the doctor chambers has a doctor chamber 61A in which a chemical solution is placed facing a rotatable anilox roll 63A, and the anilox from the doctor chamber 61A. The chemical solution is delivered to the roll 63A. Further, a plate cylinder roll 64A that is in contact with the anilox roll 63A and is also in contact with one surface of the laminated continuous sheet S2 is rotatably installed, and a chemical solution is delivered from the anilox roll 63A to the plate cylinder roll 64A. Furthermore, a chemical solution is applied from the plate cylinder roll 64A to the laminated continuous sheet S2 while applying pressure to the laminated continuous sheet S2 with the impression cylinder roll 65A facing the plate cylinder roll 64A across the laminated continuous sheet S2. It is like that.

  And in this form, this chemical | medical solution application part 53A is located in the surface side of lamination | stacking continuous sheet S2 which opposes the roller 54A of the contact embossing means 54, and opposes the above-mentioned winding drum 56A. A supply pump (not shown) for applying a chemical solution to the doctor chamber 61A and a discharge supply pump (not shown) for returning the chemical solution from the doctor chamber 61A are installed in the doctor chamber 61A.

On the other hand, as shown in FIG. 7, the chemical solution application section 53B in the form of the other doctor chamber is arranged such that the doctor chamber 61B containing the chemical solution is disposed to face the rotatable anilox roll 63B, and the doctor chamber 61B. The chemical solution is delivered to the anilox roll 63B. Further, a plate cylinder roll 64B that is in contact with the anilox roll 63B and is also in contact with the other surface of the laminated continuous sheet S2 is rotatably installed, and the chemical solution is delivered from the anilox roll 63B to the plate cylinder roll 64B. Yes. Further, a chemical solution is applied from the plate cylinder roll 64B to the laminated continuous sheet S2 while applying pressure to the laminated continuous sheet S2 with the impression cylinder roll 65B facing the plate cylinder roll 64B across the laminated continuous sheet S2. It is like that.
Depending on the viscosity of the chemical solution, there is a problem that paper dust tends to adhere to the plate surface of the plate cylinder roll 64B. Therefore, the plate cleaning means 100 is provided below the plate cylinder roll 64B.

In the present embodiment, the chemical solution application portion 53B is positioned on the other surface side of the laminated continuous sheet S2 that is not opposed to the roller 54A and is also not opposed to the winding drum 56A. A supply pump (not shown) for applying a chemical solution to the doctor chamber 61B and a discharge supply pump (not shown) for returning the chemical solution from the doctor chamber 61B are also installed in the doctor chamber 61B. .
Accordingly, the chemical solution is applied to both surfaces of the laminated continuous sheet S2 from the chemical solution application unit 53A and the chemical solution application unit 53B. At this time, the coating amount on the surface side of the laminated continuous sheet S2 facing the roller 54A by the chemical solution application unit 53A Can be applied to the laminated continuous sheet S2 from both sides of the laminated continuous sheet S2, while reducing the amount of the liquid applied to the other surface side by the chemical applying unit 53B.

Specifically, it is possible not only to change the coating amount on each side, but also to roughen the flexographic plate so that the number of lines of the flexographic plate is about 15 to 40 lines and the apex area ratio is about 20 to 40% so that the chemical solution does not scatter. By doing so, a dot pattern remains immediately after application, and an application part and an unapplication part can be instantaneously formed.
Therefore, according to the present embodiment, the flexographic printing method allows the plate to be made of resin and is elastic, so that even if there are some irregularities on the sanitary thin paper, it can be adjusted by the printing pressure. Wrinkles are difficult to enter. On the other hand, by using the flexographic printing method, the coating amount can be stabilized even when the processing speed is high, and a wide range of chemical viscosity can be stably applied with one roll. Specifically, the application is also performed when the lotion agent to be used as a chemical solution is applied at a coating amount within the range described below while the laminated continuous sheet S2 is set to 700 m / min or more, preferably at a speed of 900 m / min or more. Is uniform and the laminated continuous sheet S2 can be wound without meandering.

(Chemical solution application process-an example of gravure application)
FIG. 8 shows an example of an apparatus related to gravure coating. In FIG. 8, the dip roll 31 picks up a certain amount of chemical solution from the chemical solution storage tray 308, and the chemical solution remaining in the cell of the dip roll 31 is transferred to the gravure roll 32. Next, the chemical liquid transferred to the gravure roll 32 is simultaneously transferred to the surface of the laminated sheet S <b> 2 while being scraped off by the scraping blade 33.

(Example of chemical)
Although it does not limit as a chemical | medical solution apply | coated to the tissue paper sheet which concerns on this invention, It shows about the example of the chemical | medical solution used suitably.
From the viewpoint of improving the processing speed, the viscosity of the chemical solution applied to the tissue paper is preferably 1 to 700 mPa · s at 40 ° C., and particularly preferably 50 to 400 mPa · s. If it is less than 1 mPa · s, the chemical solution is likely to be scattered, resulting in contamination of the apparatus. Conversely, if it is more than 700 mPa · s, it is difficult to control the coating amount.

  The component preferably contains 70 to 90% polyol, 1 to 15% moisture, and 0.01 to 22% functional chemicals.

  Polyols include polyhydric alcohols such as glycerin, diglycerin, propylene glycol, 1,3-butylene glycol, polyethylene glycol, and derivatives thereof, and sugars such as sorbitol, glucose, xylitol, maltose, maltitol, mannitol, and trehalose.

  Functional agents include softeners, surfactants, inorganic and organic fine particle powders, oily components, and the like. Softeners and surfactants have the effect of imparting flexibility to the tissue and smoothing the surface, and anionic surfactants, cationic surfactants and zwitterionic surfactants are applied. Inorganic and organic fine particle powders have a smooth surface. The oil component has a function of improving lubricity, and higher alcohols such as liquid paraffin, cetanol, stearyl alcohol, and oleyl alcohol can be used.

In addition, as a functional agent, one of a hydrophilic polymer gelling agent, collagen, hydrolyzed collagen, hydrolyzed keratin, hydrolyzed silk, hyaluronic acid or a salt thereof, ceramide, etc. A moisturizing agent such as any combination can be added.
Deodorants such as flavors, emollients such as various natural extracts, vitamins, emulsifiers that stabilize compounding ingredients, antifoaming agents, antifungal agents, organic acids, etc. An agent can be appropriately blended. Furthermore, you may contain the antioxidant of vitamin C and vitamin E.
Of the above components, it is preferable to use a polyhydric alcohol such as glycerin or propylene glycol as a main component in order to stabilize the viscosity and coating amount of the chemical solution.
The temperature at the time of chemical solution application is preferably 30 ° C to 60 ° C, preferably 35 ° C to 55 ° C.

(One form of chemical flow)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a flowchart showing an example of a paper dust removing device and piping in a chemical solution of the present invention. The surplus chemical liquid containing paper powder collected from the chemical liquid application process is returned by the pump P-2 and stored in the service tank 23. The temperature of the service tank 23 is preferably set to 20 to 60 ° C. by the heater 26 in order to keep the viscosity of the chemical solution within a certain range. The uncoated chemical solution in the service tank 23 is preferably added with the undiluted chemical solution sent from the undiluted solution tank 25 by the pump P-1. This is because, in order to uniformize the quality of the chemical solution added to the tissue paper, it is preferable to process and use the chemical solution integrally instead of separately introducing the circulating chemical solution and the stock solution into the line. The circulating drug solution and the stock solution are preferably mixed at a ratio of 4: 1 to 100: 1.

  The chemical solution in the service tank 23 is sent to the chemical solution application process by the pump P-6. At that time, an excessive amount of the chemical solution is sent, and the surplus is returned again to the service tank by the return pump P-2 from the coating device (the doctor chamber 61 in the illustrated example). As described above, the chemical liquid flow of the paper dust removing apparatus according to the present invention has the first circulation path of the chemical liquid including the coating device, the pump P-6, the service tank 23, and the pump P-2.

  The chemical solution in the service tank 23 is supplied to a solid-liquid separator (centrifugal settling device 10 in the illustrated example) by a pump P-3. As the solid-liquid separation device, any known method such as filtration with a belt filter or centrifugal separation or centrifugation can be used, but a centrifugal sedimentation device, particularly a disk-type centrifugal sedimentation device can be preferably used. Before supplying the chemical solution to the centrifugal sedimentation device 10, it is preferable to perform either or both of defoaming treatment by the defoaming device 11 and heating (20 to 60 ° C.) by the heater 12. The chemical liquid from which the paper dust has been removed by solid-liquid separation in the centrifugal sedimentation apparatus 10 is sent again to the service tank 23 by the pump P-4. On the other hand, it is preferable that the chemical solution containing the paper powder discharged from the centrifugal sedimentation device 10 is further separated by the cylindrical centrifugal filtration device 22 or the like. The separated chemical liquid is sent to the service tank 23 by the pump P-5. The remaining separated pulp (paper powder) is treated as waste. Thus, in addition to the first circulation path, the chemical liquid flow of the paper dust removing device according to the present invention includes the service tank 23, the pump P-3, the centrifugal sedimentation device 10, the cylindrical centrifugal filtration device 22, the service tank 24, It has the 2nd circuit of the chemical | medical solution which passes along pump P-5.

  As the pumps P-1 to P-6, any known pump such as an air pump can be used. However, if the chemical liquid generates bubbles, the efficiency in the filtration process is reduced, and therefore it is preferable to use a gear pump that is less likely to generate bubbles.

(Another form of chemical flow)
In FIG. 2, another example of piping of a paper dust removal apparatus and a chemical | medical solution application process is shown. As shown in FIG. 2, the chemical solution separated by the centrifugal sedimentation device 10 and the cylindrical centrifugal filtration device 22 may be sent to a service tank 24 different from the service tank 23. In this case, the uncoated chemical solution mixed with paper dust in the chemical solution coating process, the filtrate containing almost no paper dust, and the separation liquid are not mixed, and therefore, the chemical solution with less paper powder mixing is provided for the chemical solution coating step. Is preferable. However, since the filtration rate of the chemical solution is a rate-limiting factor for supplying the chemical solution, it is preferable to use a device having a high processing capacity as the centrifugal sedimentation device in order to stably supply the chemical solution.
In this embodiment, the drug substance is preferably not mixed with the service tank 23 but mixed with the chemical supplied from the service tank 24 to the chemical liquid application process.

  When the viscosity of the uncoated chemical solution is 700 mPa · s or less (more preferably 400 mPa · s or less), the form of FIG. 1 can be used, but when the viscosity exceeds 700 mPa · s, the viscosity is less than 200 mPa · s. It is preferable to change to the form of FIG.

(Cylindrical centrifugal filtration device)
Since a small amount of chemical liquid remains in the paper powder discharged from the disk type centrifugal settling machine 10, it is preferable to further perform solid-liquid separation in the cylindrical centrifugal filter 22. The separation by the cylindrical centrifugal filter is preferably performed under the following conditions.
○ Bag filter: Made of resin, preferably made of polyester ○ Mesh size: 100-400 mesh ○ Amount of separated sample per time: 1.0-5.0 kg
○ Rotation speed: 2000-500rpm
○ Separation time: 15 to 45 minutes The separated chemical solution obtained by centrifugal filtration is sent to the service tank 23 or the service tank 24 (FIG. 2). Further, the separated pulp (paper powder) remaining in the bag is discarded.

(Plate cleaning means)
3 and 4 show an example of the plate cleaning means provided opposite to the plate of the chemical solution applying means according to the present invention. 3 and 4, the cleaning means 100 for the flexographic printing plate roll 64 is illustrated. The printing plate roll 64 rotates around the shaft 64S. The cleaning means 100 has a rail 102 and a cleaning head portion 103, and the cleaning head portion 103 reciprocates on the rail 102 at a constant speed of 0.15 to 1.00 m / min in the axial direction of the printing plate roll. . A part of the cleaning head 103 is fixed to the drive band 104, and the cleaning head 103 is moved by the drive band 104 being moved by a gas pressure motor, a liquid pressure motor, or another type of motor. The motor is installed at one end of the rail 102 (not shown). The cleaning head unit 103 includes two fluid supply tubes 105 and one suction tube 106. Further, the cleaning head unit 103 is connected to an external fluid supply tube 107 and an external suction tube 108. The fluid supply tube 105 and the external fluid supply tube 107 are connected in the leg portion 103L of the cleaning head portion 103, and the suction tube 106 and the external suction tube 108 are also connected in the leg portion 103L of the cleaning head portion 103. (Not shown). The mixed fluid supplied from the fluid supply means 101 (FIG. 1) having a mixing chamber that mixes water and air to produce a mixed fluid is supplied to the cleaning head 109 via the external fluid supply tube 107 and the fluid supply tube 105. Sent.

  FIG. 5 shows a top view of the surface of the cleaning head 109 that is close to the printing plate roll without contacting it. The cleaning head 109 has a large number of small injection ports 110 on the surface, and jets the mixed fluid supplied from the fluid supply tube 105 through the opening at high pressure onto the plate surface at high pressure, and the paper dust and the chemical solution adhering to the plate surface are discharged. Remove from the plate. The cleaning head 109 has a suction port 111 at the same time, and sucks the paper powder, the chemical solution, and the sprayed water scattered by the spraying by vacuum, and sucks and dries the printing surface. In this way, by immediately drying the plate surface after washing, there is no remaining of the sprayed water, and the subsequent chemical application can be performed stably.

The ejection ports 110 are preferably formed as a plurality of rows formed in a row perpendicular to the circumferential direction of the printing plate and spaced apart from each other in the circumferential direction, particularly three or more rows. The size of the injection port 110 is 0.1 to 2.0 mm ^2, particularly preferably a 0.3 to 0.7 mm ^2. The shape of the injection port 110 is preferably a circle or an ellipse, which has no corners on the inner wall and hardly deposits inorganic substances in moisture, and a circle is particularly preferable. Further, it is preferable that the suction port 111 has an elongated structure perpendicular to the circumferential direction of the printing plate, and a plurality of the suction ports 111 are spaced apart from each other in the circumferential direction. The length of the suction plate 111 in the circumferential direction of the printing plate is preferably 5 to 20 mm, particularly 7 to 15 mm. In this way, by arranging a plurality of ejection port arrays and suction ports in the circumferential direction of the printing plate, cleaning and suction are continuously performed a plurality of times by one cleaning head 109, and more effective cleaning is performed. It can be performed.

  The cleaning head 109 reciprocates in the axial direction of the printing plate, in the left-right direction in FIG. By doing so, the high-pressure mixed fluid is uniformly ejected onto the printing plate along the reciprocating direction which is the axial direction.

  A sectional view of the cleaning head 109 is shown in FIG. Inside the cleaning head 109, a fluid path 112 and a suction path 113 are independently arranged. Further, the ejection port 110 and the suction port 111 are separated from each other by a distance of at least 2.0 mm or more, particularly 3.0 to 7.0 mm. By separating the fluid path 112 and the suction path 113 and separating them from each other, it is possible to prevent the fluid ejected from the ejection port 110 from being sucked before reaching the printing surface.

  The distance between the surface of the printing plate roll 64 in operation and the cleaning head 109 of the printing plate washing apparatus is preferably 0.5 to 3.0 mm, more preferably 1.0 to 2.0 mm. When the distance between the cleaning head 109 and the surface of the printing plate roll 64 is less than 0.5 mm, the momentum of the jet fluid is reduced and a desired cleaning effect cannot be obtained, or paper dust tends to accumulate on the cleaning head 109. Problems arise. If the distance between the cleaning head 109 and the surface of the printing plate roll 64 is more than 3.0 mm, the suction force becomes small and a desired cleaning effect cannot be obtained.

The high-pressure fluid is supplied to the cleaning head 109 via the fluid supply tube 105 and the external fluid supply tube 107 by the fluid supply means 101 of FIG. Here, it is preferable that the amounts of air and water taken into the fluid supply means 101 are 2.0 to 10.0 m ³ / min and 0.1 to 1.5 L / min, respectively. The injection pressures of air and water are preferably 4 to 16 Bar and 3 to 12 Bar, respectively. The mixed fluid containing the paper dust and the chemical solution sucked in the cleaning head 109 is sent to the fluid supply means 101 through the suction tube 106 and the external suction tube 108, and in the attached cyclone device (not shown), the paper dust etc. The water containing is discharged. The air taken out from the cyclone device forms a mixed fluid together with water supplied to the fluid supply means 101 from the outside, and is sent to the cleaning head 109. The water containing paper dust and the like discharged from the cyclone device is then sent to the centrifugal filtration device 122, where it is discarded after solid-liquid separation.

  DESCRIPTION OF SYMBOLS 10 ... Centrifugal settling device, 11 ... Defoaming device, 12 ... Heating device, 22,122 ... Cylindrical centrifugal filter, 23, 24 ... Service tank, 25 ... Stock solution tank, 26 ... Heater, 100 ... Plate cleaning means 101, fluid supply means, P-1 to P-6, pumps.

Claims (4)

A chemical solution application step of applying a chemical solution while placing the chemical solution on the plate surface of the plate cylinder by flexographic printing method or gravure printing method on a tissue paper base paper that runs between the impression cylinder and the plate cylinder; and
A chemical solution recovery step for solid-liquid separation of the collected chemical liquid into paper powder and chemical liquid, and integrally mixing the chemical liquid together with the stock solution of the chemical liquid to supply the chemical liquid application means;
Air containing paper dust removed from the plate surface at the same time by spraying a fluid mixed with air and water onto the plate surface by a cleaning means provided at a position facing the plate surface of the plate cylinder and not in contact with the plate surface And a surface cleaning process for sucking a mixture of water,
The manufacturing method of the chemical | medical solution containing tissue paper containing this.   The manufacturing method of the chemical | medical solution containing tissue paper of Claim 1 which makes the said tissue paper base paper run up and down between an impression cylinder and a plate cylinder, and provides the said cleaning means under the plate cylinder.   The manufacturing method of the chemical | medical solution containing tissue paper of Claim 1 or 2 whose said cleaning means is a cleaning head which reciprocates at a fixed speed in the width direction of the said plate cylinder. A chemical solution applying means for applying a chemical solution while placing the chemical solution on the plate surface of the plate cylinder by flexographic printing method or gravure printing method on the tissue paper base paper running between the impression cylinder and the plate cylinder;
A chemical recovery unit for solid-liquid separation of the recovered chemical into a paper powder and a chemical component, and the chemical solution is integrally mixed with a stock solution of the chemical solution and supplied to the chemical application unit;
Cleaning means provided at a position facing the plate surface of the plate cylinder and not in contact with the plate surface;
The cleaning means is configured to inject a fluid in a state of mixing air and water onto the plate surface and simultaneously suck a mixture of air and water including paper dust removed from the plate surface. Tissue paper manufacturing equipment.

Images