JPH10175285A - Damping water filtering apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the apparatus low in equipment cost and running cost and capable of almost perfectly removing impurities by providing a flocculant supply means, a means mixing a flocculant with damping water and a first filter means collecting flocs generated by flocculation. SOLUTION: A chemical agent A supply means 5, a chemical agent B supply means 6 and a chemical agent C supply means 7 supply chemical agents A, B, C to damping water. Thereafter, a uniform mixed soln. is formed at a high speed by a mixing means 8 and liquid flow is immediately distributed from turblent flow so as to easily form flocs. A first filter means 10 uses a bag filter formed by processing felt of syntheticd fibers into a bag shape. When floccontaining damping water is supplied to this bag filter, flocs are collected by gaps of the filter to be accumulated within the filter and filtered damping water is passed to the outside. Herein, when centrifugal separation is performed by rotating the bag filter along with the container, efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention belongs to the technical field of a filtration device. In particular, the present invention relates to a dampening solution filtering device for removing stains such as ink, paper powder, oil, etc. mixed into a dampening solution of an offset printing press.

[0002]

2. Description of the Related Art As is well known, the main purpose of using dampening solution in offset printing is to selectively apply dampening solution only to the non-image area of the printing plate, and to use the dampening solution due to the presence of the dampening solution. The purpose is to prevent ink from being applied to the image area.
The non-image area is surface-coated with, for example, a gum arabic, which is a hydrophilic polymer, as a desensitizer. Even after washing the gum arabic just before printing, it remains slightly,
Generally absorbs water well and repels oil well. However, it is necessary to make the dampening solution itself wet well, and thus the surface tension is reduced. As additives for this purpose, IPA (isopropyl alcohol), a non-alcohol etch liquid (hydrophilic liquid), or the like, which does not cause harm such as emulsifying the ink even when the surface tension is reduced, is used. Further, an additive for adjusting pH to prevent a delay in drying of the ink, an additive for preventing rusting of a printing machine, and the like are used.

The flow characteristics of ink are thixotropy, and the viscosity is reduced to an appropriate value by being kneaded by an ink kneading roller. At that time, the temperature of the ink also increases. One of the many purposes of the dampening solution is to reduce the temperature of the ink, which has risen too high, and to cool the plate so that it is at the proper temperature at the plate. Therefore, various devices for properly managing dampening water are attached to the dampening water device. A device that automatically controls the concentration of IPA (the concentration of the etchant) and the pH (for example, 4.5 to 6.0) in the dampening solution, and detects the temperature of the dampening solution (for example, 17 ° C. on the dampening roller). And automatic cooling.

[0004] In addition, various impurities are mixed into the dampening solution during printing. Ink mist is generated from the ink kneading roller and the like, and is mixed into the fountain solution. The ink or the components of the ink are mixed into the fountain solution by emulsification or the like, albeit slightly, on the plate surface. Paper dust generated from printing paper is also mixed into the dampening solution. Mixing of machine oil cannot be completely prevented. For this reason, the dampening device is provided with a filter for filtering and purifying the dampening solution. The dampening solution is constantly circulating in the printing unit between the portion of the applicator that supplies the dampening solution to the plate surface and a dampening solution management tank that appropriately manages the dampening solution. The dampening solution overflowed in the applicator of each color printing unit is collected by a pipe, passed through a filter by a circulating pump to remove impurities mixed in, and further passed through a control tank to adjust components, physical properties, liquid temperature, etc. And returned to each applicator by piping.

[0005]

However, the filter used in the conventional dampening solution apparatus uses a filter to physically capture the impurity particles that are going to pass through the gap. Therefore, it is necessary to replace the filter before clogging occurs. It is necessary to separately install a filter in each offset printing machine in order to save the time for replacing the filter about once a day and not increase the size of the filter. Therefore, the equipment cost is high, and the running cost is high because a large amount of relatively expensive filters are disposable. In addition, since the system is physically filtered, coarse dispersed particles (up to several tens of μm) and fine dispersed particles (several tens μm to 0.1 μm) are used.
Impurities such as several μm) and colloids (0.1 μm or more) cannot be completely removed, and dirt adheres to the walls of applicators, management tanks, pipes and the like. To remove it, it is necessary to periodically clean the dampening device, during which the offset printing machine cannot be operated. In addition, due to the impurities remaining in the dampening solution, thickening of the image area and background stains occur on the printed matter, resulting in poor print quality. In particular, when the dirt attached to the wall surface is peeled off, it causes a serious print quality defect.

Therefore, an object of the present invention is to reduce equipment costs and running costs, to remove impurities such as coarsely dispersed particles, finely dispersed particles and colloids almost completely, and to apply them to wall surfaces of applicators, management tanks, pipes and the like. Provided is a dampening water filtration device capable of obtaining a high-quality printed matter with extremely little adhered dirt, without causing defects such as thickening of image lines, background dirt, uneven printing, dust on a printing plate, and the like. It is in.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a dampening water filtration device for filtering dampening water of an offset printing press, comprising: a chemical supply means for supplying a flocculant to the dampening water; And a mixing means for mixing the fountain solution with the fountain solution, and a first means for supplementing flocs, which are aggregates of particles generated by aggregation.
And a fountain solution filtration device having a filtration means. According to the present invention, the flocculant is supplied to the dampening solution by the drug supply unit, the flocculant and the dampening solution are mixed by the mixing unit, and the floc (particles) are aggregates of particles generated by the first filtration unit. floc). That is, impurities contained in the dampening solution aggregate to form flocs, which are trapped and removed from the dampening solution. Here, "coagulation" in which the colloids reduce their surface potential (ζ-potential) and adhere to each other, "aggregation" in which flocs are formed by adhesion of coarsely dispersed particles, and other "collective adhesion"
Are not strictly divided, but are referred to as “aggregation” including all of them, and all the products are referred to as “floc”. By applying such a chemical method, impurities such as coarsely dispersed particles, finely dispersed particles, and colloids can be almost completely removed. In addition, the equipment cost and running cost in that case are low, and as a result, there is very little dirt attached to the walls of the applicator, management tank, piping, etc., and the image is thick, the background is dirty, the printing is uneven, and there is dust on the plate surface. A high quality printed matter can be obtained without occurrence of defects such as.

The present invention is also a "fountain solution filtering device for supplying the predetermined agent to the dampening solution in a predetermined order, wherein the coagulant comprises a predetermined number of drugs". According to the present invention, various flocculants (in the present invention, "coagulant" includes "coagulant" etc. in the present invention) can be combined, so that various impurities are flocculated to form flocs. Can be. For example, a coagulant, a cationic coagulant, and an anion that reduce the repulsive force due to the surface potential (same sign) of the particle by lowering the ζ-potential of the particle so that the attractive force by the von der Waals force works. Impurities can be more effectively agglomerated by combining a coagulant such as an ionic coagulant and a nonionic coagulant, an auxiliary agent and the like in order.

[0009] The present invention is also a "fountain solution filtering device having a second filtering means for capturing particles passing through the gap and disposed downstream of the first filtering means". In the case where all impurities contained in the dampening solution are removed only by the first filtering means, the first filtering means needs to have a considerably large capacity. According to the present invention, on the other hand, by providing the second filtering means having a relatively narrow gap downstream, the capacity of the first filtering means can be significantly reduced. Also, the first
Most of the impurities are aggregated into flocs and removed by the filtering means, so that the second filtering means is less likely to be clogged, and when used together, the replacement period is greatly lengthened.

[0010] The present invention also provides a collecting means for collecting overflowing dampening water in an applicator for supplying dampening water to each color plate surface of the offset printing press, and introducing the dampening water to the filtering means; A dampening water filtration device having a dampening water management tank for controlling the composition, physical properties, temperature, etc. of the dampening water, and supply means for supplying dampening water from the dampening water management tank to the applicator. '' . According to the present invention, the dampening solution that overflows in the applicator that supplies dampening water to each color plate surface of the offset printing press by the collecting unit is collected and introduced into the filtering unit, and is passed through the filtering unit by the dampening water management tank. The components, physical properties, temperature, etc. of the dampening water are controlled, and dampening water is supplied from the dampening water management tank to the applicator by the supply means. Therefore, a fountain solution circulation path is formed, and impurities are removed by the above-described filtering means provided in the path, and the fountain solution is constantly purified, and the fountain solution with controlled components, physical properties, and temperature is supplied to each color plate surface. .

The present invention also provides "a dampening solution filtering device comprising a pair of the filtering means, and having a selecting means for individually selecting an operating state and a stopped state for the pair of filtering means".
It is. ADVANTAGE OF THE INVENTION According to this invention, even if one of a pair of filtration means is a stop state, if the other is an operation state, a dampening solution can be purified. Therefore, the turret material such as the filter can be replaced while the purification of the dampening solution is continued. Further, the present invention is a "fountain solution filtering device for recovering dampening water from the plurality of offset printing presses, and the supply unit supplying dampening water to the plurality of offset printing presses". ADVANTAGE OF THE INVENTION According to this invention, the number of installation of a dampening-water filtration apparatus decreases by centralized processing, and equipment cost and running cost decrease.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to embodiments. FIG. 1 is a diagram schematically showing the configuration of the dampening solution filtration device of the present invention. In FIG. 1, 1a, 1b, 1
Each of c, 1d, and 1e is an offset printing press. As is well known, a dampening solution applicator (not shown) is attached to each color printing unit of the offset printing presses 1a to 1e. The dampener applicator is usually a dampener,
It has dampening fountain rollers and supplies dampening water to the plate surface. Further, a dampening water management device (not shown) can be attached to each of the offset printing presses 1a to 1e as in the related art.
More efficiently, a fountain solution management device is provided at a position after the filtration system and before the fountain solution is supplied to the plurality of offset printing presses 1a to 1e to perform centralized processing.

In FIG. 1, reference numeral 2a denotes a pump for supplying filtered dampening water to the offset printing presses 1a to 1e through a pipe, and 2b overflows in a dampening water applicator of the offset printing presses 1a to 1e and collects through the pipes. This is a pump for supplying the dampening solution to the filtration system. 3
Is a flow meter that measures the flow rate of the dampening solution supplied to the filtration system through a pipe, and 4 is a PH that measures the pH of the dampening solution.
5 is a drug A supply means for supplying the drug A to dampening water;
Is a medicine B supply means for supplying the medicine B to the dampening water, 7 is a medicine C supply means for supplying the medicine C to the dampening water, 8 is a mixing means for mixing the medicine and the dampening water, and 9 is a first means. A valve for opening and closing a pipe to the filtration means, 10 is the first filtration means, 11 is the second filtration means
Means of filtration. The dampening solution that has passed through the second filtering means 11 is pumped by the pump 2a (via the dampening water management device).
Returned to the applicator of the offset printing press 1a-1e,
Circulates according to the path described above.

Next, the operation of the dampening water filtration device of the present invention and its peripheral devices in the above configuration will be described. The dampening water management tank (not shown) is provided with a detector for detecting the concentration of IPA and / or the concentration of etchant (hydrophilic liquid), pH, water temperature and the like in the dampening water. Further, a controller is provided for automatically controlling components, physical properties, liquid temperature, liquid replenishment and the like based on the detected data. The pH is usually
The temperature is adjusted to about 4.5 to 6.0, and the temperature is adjusted to about 17 ° C. on a dampening roller, for example. The dampening water in the dampening water management tank is supplied to the offset printing machine 1 by a pump (not shown).
The ink is supplied to the dampening fountains of the printing units a to 1e (not shown) via piping. There are eight dampening fountains in one offset printing machine if it is a two-sided four-color offset printing press. The dampening water in the dampening fountain is supplied to the plate surface of the plate cylinder by the dampening fountain roller and a plurality of rollers following the roller, absorbed by the hydrophilic non-image portion of the plate surface, and ink is prevented from adhering to the non-image portion. To

By the way, ink adheres to the lipophilic image portion of the plate surface, and the roller for supplying the dampening solution in contact with the plate surface also comes into contact with the ink of the image portion. Since the surface of the roller is wet by the fountain solution, the adhesion of ink to the surface of the roller is not a simple theory. However, in practice, the ink or components of the ink enter the dampening solution in the dampening fountain via a plurality of rollers supplying the dampening solution to the plate surface. It is considered that this is mainly because the ink or the components of the ink are slightly dissolved in the fountain solution, and the ink or the components of the ink are dispersed in the fountain solution as an emulsion.

An ink kneading roller and an inking roller are provided near the plate cylinder, and ink mist is generated when the roller and the roller divide the ink film. Further, the printing paper is transported near the plate cylinder, and paper dust is generated from the printing paper. Impurities such as ink mist, paper powder, and other mechanical oil adhere to a plurality of rollers that supply dampening water to the plate surface, and enter the dampening water in the dampening fountain through these rollers. There are also impurities that directly enter the dampening solution in the dampening fountain. As a result, the fountain solution overflowing the fountain fountain contains impurities.

The dampening solution overflowing the damping fountains in the offset printing presses 1a to 1e is collected at one place, and supplied to a filtration system by a pump 2b to remove the above-mentioned impurities. As shown in FIG. 1, dampening water supplied by the pump 2b flows through the pipe. A flow meter 3 is provided on the pipe, and the flow meter 3 measures the flow rate of the dampening solution. The flow rate data obtained by the flow meter 3 is used for the purpose of monitoring whether or not the dampening solution circulates normally and for the purpose of determining the supply amount of the medicine. A PH meter 4 is provided on the pipe, and the PH meter 4 measures the pH of the dampening solution.
The PH data obtained by the PH meter 4 is used for the purpose of monitoring whether or not the pH of the dampening solution is within a predetermined range, and for the purpose of determining the compounding ratio of a drug, for example, the mixing ratio of a PH regulator. In addition to the PH meter 4, if necessary, a device for measuring the composition and physical properties of the dampening solution can be provided in the pipe.

Subsequently, the dampening solution is guided to the pipe and passes through the medicine A supply means 5, the medicine B supply means 6, and the medicine C supply means 7 in that order. At this time, the medicine A is supplied to the dampening solution in the medicine A supply means 5, the medicine B is supplied to the dampening water in the medicine B supply means 6, and the medicine C is supplied to the dampening water in the medicine C supply means 7. Is supplied. In FIG. 1, the medicine supply means is divided into three parts for supplying the medicine A, the medicine B, and the medicine C, but this is an example, and one or more parts can be provided as necessary. The drug A, the drug B, and the drug C are coagulants (including a coagulant) themselves or drugs that serve as auxiliaries. In the dampening solution filtration device of the present invention, a suitable (effective and no adverse effect) flocculant can be selected and used from well-known flocculants, and is basically limited by the type of the flocculant. There is no.

The medicine A supply means 5, the medicine B supply means 6, and the medicine C supply means 7 supply the medicine A, the medicine B, and the medicine C to the dampening solution, and the natural flow of the dampening solution in that part. Thus, the medicine A, the medicine B, and the medicine C are respectively mixed with the dampening solution. The medicine A supply means 5, the medicine B supply means 6, and the medicine C supply means 7 can be provided with a mixing means for generating a forced liquid flow in addition to the natural liquid flow as required.

After the medicine A, the medicine B, and the medicine C are supplied, the mixing means 8 mixes the medicines with the dampening water by a forced liquid flow to produce a uniform mixed liquid. Normally, the mixing means 8 generates flocs, which are aggregates of particles generated by aggregation. After the floc has been formed, avoid vigorous agitation to break and redisperse the floc. Therefore, it is preferable that the mixing means 8 immediately generate a uniform mixed liquid at a rapid speed and thereafter immediately rectify the liquid flow from the turbulent flow so as to easily generate flocs. As the mixing means 8, for example,
Partitions (vanes) are provided in multiple stages in the piping to change the direction of the liquid flow or change the adjacency of the divided liquid flows obtained by dividing the liquid flow to combine them. A static mixer that automatically mixes can be used.

The valve 9 is "open" during use.
A fountain solution containing flocs is supplied to the first filtration means 10. The first filtering means 10 uses, for example, a bag filter in which felt such as synthetic fiber is processed into a bag shape as a fabric. When fountain solution containing flock is supplied to the inside of the bag of the bag filter, the flock is trapped in the gap and stays inside, and the fountain solution of the filtered liquid passes to the outside. The fountain solution containing floc can be filtered by the method of spontaneously flowing out of the bag filter due to gravity. However, if the bag filter is rotated together with the container and centrifuged (coagulation centrifugation), it can be efficiently performed on a small equipment scale. The tower can be filtered.

The fountain solution that has passed through the first filtering means 10 is supplied to the second filtering means 11. The second filtering means 10 has a relatively narrow gap as compared with the first filtering means. When all the impurities contained in the dampening solution are removed only by the first filtering means, the first filtering means needs to have a considerably large capacity. Can be reduced in size. Further, since the first filtering means removes most of the large-sized impurity particles and oily particles, the second filtering means is less likely to be clogged, and when used together, the replacement period is greatly lengthened and the running cost is reduced. To save.

The dampening solution, which has passed through the second filtration means 10 and has been purified by removing impurities, is returned to a dampening solution management tank (not shown) by a pump 2a, and its components, physical properties, liquid temperature, and liquid replenishment are replenished. Are adjusted. The dampening water stored in the dampening water management tank is again supplied to dampening water fountains of printing units (not shown) of the offset printing presses 1a to 1e via piping, and circulates through the above-described circulation path. .

Although only one filtration system is shown in FIG. 1, it can be constituted by a pair of filtration means. In that case, even if one of them is stopped, the dampening solution can be purified if the other is in operation. Therefore, a filter medium such as a filter can be replaced while the purification of the dampening solution is continued. A valve is provided at the inlet of the filtering means of each system, and the opening and closing of the valve can put the filtering means into an operating state or a stopped state. Further, in the configuration shown in FIG. 1, the dampening solution filtering device of the present invention collects dampening water from the plurality of offset printing presses 1a to 1e and supplies the dampening solution to the plurality of offset printing presses 1a to 1e. I do. By intensively treating the dampening water in this way, the number of dampening water filtration devices to be installed is reduced, and equipment costs and running costs can be reduced.

Next, the configuration of the filtering means in the dampening solution filtration device of the present invention will be described. FIG. 2 is a diagram showing an example of the configuration of the filtering means in the dampening solution filtration device of the present invention. In FIG. 2, 21 is a pipe for guiding dampening water to the filtration system, 22 is a discharge pipe for dampening water in the first filtration means, 2
3 is a bag filter, 24 is a container that holds the bag filter 23 and collects the dampening solution that has passed, 25a is a pipe 21
25b is a valve provided at the bottom of the container 24 and connected to a pipe (not shown) to the second filtration means, and 26 is a second filtration means. A cartridge filter, 27 is a valve provided at the outlet of the dampening solution filtered in the filtration system, 28 is a housing,
29a and 29b are doors of the housing.

FIG. 2A is a diagram showing the internal structure of the filtering means. As shown in FIG. 2A, the dampening water supplied by the pipe 21 is discharged from a plurality of openings provided at the distal end of the discharge pipe 22 to the center of the bottom of the bag filter 23. By discharging the floc to the central portion of the bottom of the bag filter 23 in this manner, re-dispersion of the floc due to unnecessary stirring of the dampening solution containing the floc is prevented, and sedimentation of the floc is not hindered. The floc contained in the dampening solution settles to the bottom of the bag filter 23 and is captured on the inner surface of the bag filter 23, and the floc is removed from the dampening solution passing through the bag filter 23.

The dampening solution that has passed through the bag filter 23 is collected in the container 24. The valve 25b is normally open, and the cartridge filter 2 serving as the second filtering means is opened.
6 through a pipe (not shown). The second filtering means, as already explained, can capture impurities of smaller dimensions due to the relatively narrow gap.
The clean dampening water filtered by the cartridge filter 26 is collected by piping (not shown) and supplied to the printing unit (via the dampening water management device) through an open valve 27 and piping (not shown). You.

FIG. 2B shows the discharge pipe 22 in the filtering means.
Position adjustment and doors 29a, 29b provided in the housing 28
FIG. As shown in FIG.
Has a mechanism to adjust the position up and down. In order to avoid unnecessary stirring of flocs that settle and accumulate at the bottom of the bag filter 23 with the dampening solution to be ejected, it is necessary to adjust the discharge pipe 22 to an appropriate position according to the height of the accumulated flocs. it can. The doors 29a and 29b are opened for maintenance such as replacement of the bag filter 23 and the cartridge filter 26. Valves 25a, 25b,
The valve 27 is opened during operation of the filtration system and closed as needed during maintenance.

Examples of the filter material usable for the bag filter 23 and the cartridge filter 26 include woven fabrics made of cotton, synthetic fiber, glass fiber, stainless steel cloth, iron cloth, and the like, or filter paper, synthetic resin products, felt, and asbestos. Non-woven fabrics can be used. As the synthetic fiber, a fiber of vinyl acetate type, polyamide type, vinyl chloride type, acrylic type, ethylene type, propylene type or the like can be used. These turret materials are used after being formed into a bag filter or a cartridge filter so as to improve performance and handleability.

Next, the flocculant which can be used in the dampening solution filtration device of the present invention will be described. As described above, in the dampening water filtration device of the present invention, a suitable flocculant (having an effect and no adverse effect) can be selected from well-known flocculants and basically used. There is no limitation by type. Examples of the organic coagulant include a partially hydrolyzed product of polyacrylamide or polyacrylonitrile, a copolymer of vinyl acetate and maleic anhydride, a sodium salt having a carboxy ion such as polyacrylic acid, alginic acid, or alkali starch or an NH ₄ salt. Or polysoap, cationic starch, polysaccharide, gelatin, soy protein and the like.

Examples of the inorganic coagulant include polyaluminum chloride, polyaluminum sulfate, ferric polychloride, ferric polysulfate, aluminum chloride, aluminum sulfate, aluminum-containing aluminum sulfate, ammonium alum, potassium alum, and sulfuric acid. Examples include ferrous iron, ferric sulfate, ferric chloride, copper chloride, zinc chloride, zinc sulfate, magnesium oxide, magnesium carbonate, electrolytic aluminum hydroxide, and electrolytic iron hydroxide. These inorganic coagulants are pH adjusters composed of acids and alkalis,
It is used together with flocculants such as floc heavier, floc formation aid and other agents.

[0032]

As described above, according to the present invention, equipment costs and running costs are low, impurities such as coarsely dispersed particles, finely dispersed particles, and colloids can be almost completely removed. Very little dirt adhering to the walls of pipes and the like, and high quality printed matter can be obtained without defects such as thickening of image lines, background stain, uneven printing, dust on the plate surface, etc. An apparatus is provided. According to the present invention, the coagulant is composed of a predetermined number of medicines, and the medicine supply means supplies the predetermined medicine to the dampening water in a predetermined order. Can be aggregated to form flocs. Further, according to the present invention, which has the second filtering means for capturing particles that are going to pass through the gap and is disposed downstream of the first filtering means, the second filtering means having a relatively narrow gap is provided.
By providing the filtering means in the downstream, the capacity of the first filtering means can be significantly reduced. Further, most of the impurities are aggregated into flocs and removed by the first filtering means, so that the second filtering means is less likely to be clogged,
When used together, the replacement period is greatly extended.

Further, a collecting means for collecting the overflowing dampening water in the applicator for supplying the dampening water to each color plate surface of the offset printing press and introducing the dampening water to the filtering means, and the components and physical properties of the dampening water passing through the filtering means According to the present invention, which has a dampening water management tank that controls temperature and the like, and a supply unit that supplies dampening water from the dampening water management tank to the applicator, a circulation path of dampening water is formed. Impurities are removed by the above-described filtering means provided in the passage and are always purified, and a fountain solution whose components, physical properties, temperature, and the like are controlled is supplied to each color plate surface.

Further, according to the present invention, wherein the filtering means is constituted by a pair and the selecting means for individually selecting the operating state and the stopped state for the pair of filtering means, one of the pair of filtering means is provided. Even in the stop state, if the other is in the operating state, the dampening solution can be purified. Therefore, the turret material such as the filter can be replaced while the purification of the dampening solution is continued. Further, according to the present invention, the recovery means recovers dampening water from the plurality of offset printing presses, and the supply means supplies the dampening water to the plurality of offset printing presses. The number of installed filtration devices is reduced,
Equipment costs and running costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a configuration of a dampening solution filtration device of the present invention.

FIG. 2 is a diagram showing an example of the configuration of a filtering means in the dampening solution filtration device of the present invention.

[Explanation of symbols]

 1a-1e Offset printing machine 2a, 2b Pump 3 Flow meter 4 PH meter 5 Drug A supply means 6 Drug B supply means 7 Drug C supply means 8 Mixing means 9 Valve 10 First filtration means 11 Second filtration means 21 Piping 22 Discharge pipe 23 Bag filter 24 Container 25a, 25b, 27 Valve 26 Cartridge filter 28 Housing 29a, 19b Door

Claims (6)

[Claims] 1. A dampening water filtration device for filtering dampening water of an offset printing press, comprising: a medicine supply means for supplying a flocculant to the dampening water; and mixing the flocculant with the dampening water. A dampening solution filtering device, comprising: mixing means for performing the mixing, and first filtering means for capturing a floc which is a particle aggregate generated by aggregation. 2. A dampening solution filtering device according to claim 1, wherein said coagulant comprises a predetermined number of drugs, and said drug supply means supplies predetermined drugs to the dampening solution in a predetermined order. . 3. A dampening device according to claim 1, further comprising a second filtering means for trapping particles passing through the gap, and being disposed downstream of the first filtering means. Water filtration device. 4. A recovery device for recovering overflowing dampening solution in an applicator for supplying dampening solution to each color plate surface of the offset printing press and introducing the dampening solution into the chemical supply means and / or the mixing means and / or the filtration means. Means, dampening solution management tank for managing the components, physical properties, temperature, etc. of the dampening solution that has passed through the filtering means, and supply means for supplying dampening water from the dampening water management tank to the applicator, The fountain solution filtration device according to any one of claims 1 to 3, further comprising: 5. The filter device according to claim 1, wherein said filter means comprises a pair, and said filter means has a selection means for individually selecting an operation state and a stop state for said pair of filter means. The fountain solution filtration device according to the above. 6. The apparatus according to claim 4, wherein said recovery means recovers dampening water from a plurality of offset printing presses, and said supply means supplies dampening water to said plurality of offset printing presses. 5. The fountain solution filter according to 5.