JP2013103420A - Dampening-water cleaning device and cleaning method for offset printing press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide device and method for removing pigment and/or dye dissolved in contaminated dampening water which has been used in an offset printing machine.SOLUTION: In the dampening water circulation system for filtrating and then returning contaminated dampening water to the offset printing machine, solid organic matter 16 having greater solubility in damping water than in pigment and/or dye of printing ink is allowed to be in contact with the contaminated dampening water so that the pigment and/or dye dissolved in the contaminated dampening water may transfer from the damping water into the solid organic matter 16 to be dissolved in the solid organic matter 16. Thus, any pigment and/or dye dissolved in the contaminated dampening water will be removed.

Description

  The present invention relates to a dampening water purifying apparatus and a purifying method for an offset printing machine, and in particular, a dampening water purifying apparatus for an offset printing machine that removes pigments and / or dyes dissolved in dampening water from printing ink. And a purification method.

  As is well known, in offset printing, an oleophilic image area to which ink is attached and a hydrophilic non-image area to which water is attached are formed on the surface of the plate, and dampening water is applied before applying ink. When the ink is applied to the plate, dampening water is applied to the non-image area, and the ink is applied to the plate, the ink is applied only to the image area.

  As the fountain solution, a large amount of water to which various additives are added is used, and the used fountain solution is contaminated with paper powder, ink, cleaning solvent, and the like. Such dirty fountain solution after use is physically filtered by a filtration device in the fountain solution circulation system and then supplied again to the offset printing press.

  However, the printing inks that can be physically filtered and removed by the filtration device are not dissolved in the fountain solution, but only exist in an insoluble state in the fountain solution. In the dirty fountain solution, there are pigments and / or dyes dissolved in the fountain solution, so that the fountain solution is colored overall. Such pigments and / or dyes dissolved in the fountain solution cannot be removed by physical filtration with a filtration device. When the coloring state exceeds a certain limit, the color is transferred from the fountain solution to the paper (printed body), resulting in a decrease in print quality.

  Therefore, it is necessary to replace the entire fountain solution. However, the replacement itself is costly, an environmental problem arises in the disposal of the used fountain solution, and printing is performed during the replacement of the fountain solution. There was a problem that could not.

  For this reason, conventionally, attempts have been made to remove the pigment or (and) dye dissolved in the fountain solution by adsorbing it on an adsorbent such as activated carbon or zeolite (for example, Patent Documents 1 and 2).

JP-A-10-296002 JP 2000-351193 A

  However, when adsorbents are used as described above, even if the pigments and / or dyes dissolved in the fountain solution can be adsorbed and removed, even the useful additives added to the fountain solution are adsorbed. As a result, the function of the fountain solution is remarkably deteriorated and printing cannot be performed successfully.

  The present invention has been made in view of such conventional circumstances, and one of the objects of the present invention is to dissolve a fountain solution without removing useful additives added to the fountain solution. It is an object of the present invention to provide a fountain solution purifying apparatus and a purifying method for an offset printing press that can remove pigments and / or dyes.

  Another object of the present invention is to provide a dampening water purifying apparatus and a purifying method for an offset printing press that can remove pigments and / or dyes dissolved in dampening water at a low cost. .

  Still other objects of the present invention will become apparent from the following description.

A dampening water purifying device for an offset printing machine according to the present invention comprises:
A dampening water purification device for an offset printing machine, which is placed in a dampening water circulation system for filtering dirty dampening water used in an offset printing machine and returning it to the offset printing machine,
The solid organic matter having higher compatibility with the fountain solution than the fountain solution is exchangeably retained with respect to the pigment or / and the dye of the printing ink to be removed, and the soiled fountain solution is brought into contact with the solid organic matter. The pigment or (and) the dye dissolved in the dirty dampening water is transferred from the dampening water to the inside of the solid organic matter and dissolved in the solid organic matter, whereby the soiled The pigment or / and the dye dissolved in the fountain solution are removed from the fountain solution.

Further, a dampening water purification method for an offset printing machine according to the present invention includes:
In the dampening water circulation system for filtering the dirty dampening water used in the offset printing machine and returning it to the offset printing machine,
A solid organic material having a higher compatibility with the fountain solution than the fountain solution with respect to the pigment or / and dye of the printing ink to be removed is dissolved in the fountain solution by bringing the solid organic material into contact with the fountain solution. A pigment or (and) a dye that is transferred from the fountain solution to the inside of the solid organic matter and is dissolved in the solid organic matter, whereby the pigment is dissolved in the fountain solution from the dirty dampening solution Or (and) to remove the dye.

  Although pigments are sometimes referred to as insoluble in water, some pigments (especially organic pigments) actually dissolve in trace amounts in water. Moreover, it is thought that it may dissolve | melt by the effect | action of additives, such as a solvent in dampening water.

  In the present invention, a solid organic substance having a higher compatibility with the printing ink pigment or (and) dye to be removed than the fountain solution is dissolved in the fountain solution by contacting with the dirty fountain solution. Pigments and / or dyes that migrate from the fountain solution into the solid organic matter and dissolve within the solid organic matter, whereby the pigment or (and ) Remove the dye.

  In the present invention, when the pigment or (and) the dye comes into contact with the solid organic matter, it is more comfortable to exist in the solid organic matter than so-called dampening water. It moves from the fountain solution that has been used to the solid organic matter and dissolves in the solid organic matter. Depending on the principle that the adsorbent, such as activated carbon, adsorbs other substances, or the principle that a conventional filtration device physically catches the filter material constituting the filter medium and captures it, the pigment or ( It should be noted that and) the dye is removed.

  And since only the substance having higher compatibility with the solid organic matter than the fountain solution is removed, it is possible to prevent the useful additive in the fountain solution from being removed.

  Moreover, since it is only necessary to bring the solid organic substance into contact with the fountain solution, the pigment or (and) the dye dissolved in the fountain solution can be removed at a low cost.

  If the pigment or (and) dye dissolved in the solid organic substance becomes saturated, the pigment or (and) dye cannot be removed from the dampening water any more, so the solid organic substance is replaced.

A dampening water purification device and a purification method for an offset printing machine according to the present invention include:
(A) The pigment or (and) dye dissolved in the fountain solution can be removed without removing useful additives added to the fountain solution.
(B) The pigment or (and) the dye dissolved in the fountain solution can be removed at a low cost.
It is possible to obtain excellent effects such as.

It is a schematic side view which shows the ink and the fountain solution supply mechanism to the planographic plate of the offset printing machine in one Example of this invention. It is a systematic diagram which shows the dampening water circulation system in the said Example. It is a perspective view which shows the box-shaped filter medium of the filter of the filtration and purification apparatus in the said Example. It is sectional drawing which shows the whole filter in the said Example. It is a front view which shows the whole filtration and purification apparatus in the said Example. It is a side view which shows the said filtration and purification apparatus whole. It is a perspective view which shows the filter container in the said filtration and purification apparatus. It is a sectional side view which shows the upper stage side filter accommodating part in the said filtration and purification apparatus. It is a sectional side view which shows the lower filter housing part in the said filtration and purification apparatus. It is front sectional drawing which shows the filter accommodating part of the upper stage in the said filtration and purification apparatus.

  As the solid organic matter in the present invention, any solid organic matter having higher compatibility than the fountain solution for the pigment or (and) the dye of the printing ink to be removed can be used.

  The solid organic material that can be used in the present invention may differ depending on the type of pigment or (and) dye to be removed and the type of additive such as the solvent, but in general, many pigments Alternatively (and) polyurethanes can be used as solid organics in the present invention for the dyes. Polyurethane is suitable as a solid organic material in the present invention in that it is easily available and inexpensive.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings.

  In this example, the following inks were used as printing inks for an offset printing machine.

Black ink: T & K TOKA Co., Ltd., Super Tech Plus SOYA E100 Black,
Yellow ink: manufactured by T & K TOKA Corporation, Super Tech Plus SOYA E100 Yellow,
Red ink: T & K TOKA Co., Ltd., Super Tech Plus SOYA E100 Red,
Indigo ink: T & K TOKA Co., Ltd., Super Tech Plus SOYA E100 Indigo,
Moreover, what added H liquid (The Koyo Chemical Industries Co., Ltd. make, SOLAIA KS-YS) to the tap water as dampening water was used. As a result, water-soluble resins such as citric acid and gum arabic solution, preservatives, surface tension reducing agents (nonionic active agents), alcohol solvents, cellosolve solvents and the like are added to the fountain solution.

  FIG. 1 shows an ink and fountain solution supply mechanism 1 for a lithographic plate in an offset printing machine according to the present embodiment. It is applied to the entire surface of the lithographic plate 7 attached to the plate cylinder 6 via the roller 4 and the swim roller 5, and only a small amount of dampening water is held in a highly hydrophilic non-image area. After that, when oil-based offset ink is applied to the entire surface of the lithographic plate 7 with the ink form roller 8, the ink adheres only to the image area having high oleophilicity and hence high ink receptivity, and the non-image area holding dampening water is retained. The part repels oil-based ink, and no ink adheres to the non-image area.

  In this way, ink is selectively attached only to the image line portion of the image line portion and the non-image line portion, and further, paper (printed material, not shown) is passed from the lithographic plate 7 via a blanket (not shown). Ink) is transferred to the paper, and an ink image is formed on the paper.

  Therefore, the function of the fountain solution is very important for performing a large amount of clean printing in offset printing. For this reason, the fountain solution is mixed with various additive substances for forming a uniform and firm water film on the surface of the planographic plate 7 and repelling the oil-based ink.

  Every time the dampening water is applied to the lithographic plate 7, the swimming roller 5 comes into contact with the printing ink on the lithographic plate 7. For this reason, ink gradually mixes in the fountain solution.

  Also, in offset printing, the printed matter is piled up one after another in the paper discharge section of the printing press, so that the final color is printed for the purpose of preventing the ink from adhering to the back of the printed paper. Just before being discharged, fine powder (powder) is sprayed on the entire printing surface one by one, but this powder scattered in the air may be mixed in the dampening water. Further, in order to clean the surface of the lithographic plate 7 during printing, a solvent-based plate cleaner is often included in the sponge to wipe the surface of the lithographic plate 7, and the blanket is used to remove printing ink deposited on the blanket rubber cylinder. Although the rubber cylinder is cleaned with a solvent-based blanket cleaning agent, these cleaners and cleaning agents are often mixed into the dampening water. In addition, cutting chips (paper dust) of the printing paper are scattered in the air and mixed into the dampening water.

  As described above, the fountain solution is in an environment in which various impurities such as oil-based ink, solvent, oil, paper powder powder and the like are mixed and the original function is hindered.

  FIG. 2 shows the circulation system of the dampening water in the present embodiment. The dampening water circulates in the dampening water circulation consisting of the path of the water tank 2 of the ink and dampening water supply mechanism 1, the intermediate tank 9, the primary treatment device 10, the filtration and purification device 11, the dampening water storage tank 12, and the water boat 2. It is designed to circulate through the system. In order to explain this in sequence, the dampening water sent from the water boat 2 is removed from the foam in the intermediate tank 9, and then becomes a large particle size or a relatively large lump shape by the primary treatment device 10. The primary treatment is performed to remove ink, oil, etc. (these are present in an insoluble state in the fountain solution). As such a primary processing apparatus 10, for example, a “fountain solution purification apparatus for offset printing” disclosed in JP-A-2005-238448 can be used.

  The fountain solution from which the ink and oil having been removed in the form of particles having a large particle size or a relatively large lump is removed is sent from the primary processing device 10 to the filtration and purification device 11. The dampening water sent to the filtration and purification device 11 contains fine impurities such as fine ink / oil particles, paper powder, and powder that are not dissolved in the dampening water. A pigment or (and) dye is present in a state dissolved in water, and the fountain solution is colored throughout by the pigment or (and) dye.

  In the present embodiment, the filtering and purifying device 11 physically filters the fountain solution as described in detail below, and fine ink / oil particles not dissolved in the fountain solution, paper powder, In addition to functioning as a filtration device for removing fine impurities such as powder, it also functions as a fountain solution purification device of the present invention for removing pigments and / or dyes dissolved in the fountain solution. .

  FIG. 3 shows a box-shaped filter medium 14 of the filter 13 used in the filtration and purification device 11, and a nonwoven fabric made of polypropylene or polyethylene or the like is used above with a yarn (not shown) made of polypropylene or the like. Is sewn in an open box shape.

  FIG. 4 shows the entire filter 13 in this embodiment, and this filter 13 is formed by accommodating a polymer filter medium 16 packed in a net bag 15 in a box-shaped filter medium 14. The polymer filter medium 16 is formed by cutting a polyether-based soft foamed polyurethane sheet (product name: Color Foam ECZ, manufactured by Inoac Corporation) having a thickness of about 5 mm into a strip or string having a width of about 3 mm. As will be described in detail later, the polymer filter medium 16 functions as a filter medium for performing physical filtration and at the same time functions as a solid organic substance in the present invention. The net bag 15 packed with the polymer filter medium 16 is fastened to the box-shaped filter medium 14 by a coupler 17 at a plurality of locations.

  5 to 10 show a specific configuration of the filtration and purification device 11. A pump 19 is attached to the lower part of the base 18 of the filtration and purification device 11. The pump 19 sucks dirty dampening water discharged from the primary processing apparatus 10 as indicated by an arrow A in FIG. Five filter containers 20 made of plastic are attached to the upper portion of the base 18 so as to overlap in the vertical direction.

  Each filter container 20 is a unit that constitutes each stage of the filter accommodating portion 21 and has the same shape and the same size (however, only the bottom filter container 20 has a bottom portion that will be described in detail later). The position and number of the discharge ports 22 are different from those of the other filter containers 20). FIG. 7 shows the filter container 20 and only one open portion cover 23 which will be described in detail later. As well shown in the figure, each filter container 20 basically has a box shape, and the upper part and the upper front are opened. Linear cover insertion grooves 24 are respectively provided in the vertical direction in portions near the front end of the inner wall surfaces 20a, 20b on the left and right sides of each filter container 20. A discharge port 22 is provided at the bottom of each filter container 20.

  As shown in FIGS. 5, 6, 8, and 10, an upper lid member 25 is attached to the upper end of the uppermost filter container 20, and the upper lid member 25 is located above the uppermost filter container 20. The opening is closed. As shown in FIGS. 8 and 10, the outlet side of the pipe 26 branched into four paths attached to the upper lid member 25 penetrates into the uppermost filter container 20. As shown in FIGS. 5 and 6, the inlet side of the pipe 26 is connected to the discharge port of the pump 19 through a valve 27. The second to fifth filter containers 20 from the top are stacked such that the upper open portion of the lower filter container 20 is closed at the bottom of the upper filter container 20. In this way, the upper lid member 25 is attached to the uppermost filter container 20, and the five filter containers 20 are stacked in the vertical direction, thereby forming the filter housing portion 21 in five levels in the vertical direction. In addition, a lateral opening portion 28 (see FIGS. 5, 8, and 9) that is open in the lateral direction (in particular, forward in the present embodiment) is formed in the filter housing portion 21 of each stage.

  As shown in FIGS. 8 to 10, each of the four outlets 22 is provided at the bottom of the first to fourth stage filter housing portion 21 (the first to fourth filter containers 20 from the top). The space in the upper filter housing portion 21 and the space in the lower filter housing portion 21 are made continuous. These discharge ports 22 constitute a flow path that guides water from the upper filter housing portion 21 to the lower filter housing portion 21. As shown in FIG. 9, only one discharge port 22 is provided at the bottom of the lowermost filter housing portion 21 (bottom filter container 20), and this discharge port 22 is connected via a pipe 32. The dampening water storage tank 12 is connected. A filter mounting material 29 that has a large number of small holes 29 a and allows water to pass therethrough is mounted on the bottom of the filter housing portion 21 at each stage.

  As shown in FIGS. 8 to 10, two filters 13 are housed side by side in the filter housing portion 21 of each stage while being placed on the filter placement material 29. It should be noted that the outlet of the pipe 26 branched into four paths and the four outlets 22 provided in the first to fourth stage filter accommodating portions 21 from the top are two polymer filters 16 of each filter 13. It is arranged so that it is located on each.

  As shown in FIG. 7, the opening cover 23 has an opaque plastic lower plate 23 a and a transparent plastic upper plate 23 b, and the upper plate 23 b is lowered by a hinge 30. It is attached to the upper end of the side plate 23a so as to be rotatable around an axis extending in the width direction. The lower plate 23a is inserted in the cover insertion groove 24 of the filter container 20 so that both ends in the width direction can be extracted. A stopper 31 is attached to the upper plate 23b.

  In the filtering and purifying apparatus 11, the dampening solution used in the printing machine is sucked by the pump 19 as shown by an arrow A in FIG. 5, discharged from the pump 19, and upward through the valve 27. Then, it naturally falls from the outlet of the pipe 26 into the uppermost filter accommodating portion 21 as shown by the arrows in FIGS. Then, while passing through the polymer filter medium 16 in contact with the polymer filter medium 16 of the filter 13 accommodated in the uppermost filter accommodating section 21, it further passes through the box-shaped filter medium 14. Thus, the fountain solution is physically filtered by the polymer filter medium 16 and the box-shaped filter medium 14 in the uppermost filter housing portion 21, and fine ink / oil particles (not dissolved in the fountain solution, the filter 13) and fine impurities such as paper powder and powder are removed.

  At the same time, the polymer filter medium 16 (solid organic material) is made of polyurethane and is more compatible with the pigment or (and) dye dissolved in the fountain solution than in the fountain solution. The pigment or / and the dye that is being transferred migrates toward the polymer filter medium 16 and dissolves inside the polymer filter medium 16. As a result, the pigment or (and / or dye) dissolved in the fountain solution is removed from the dirty fountain solution.

  The dampening water that has passed through the uppermost filter housing portion 21 naturally falls into the second-stage filter housing portion 21 from the top through the discharge port 22 at the bottom of the filter housing portion 21. Then, while passing through the polymer filter medium 16 in contact with the polymer filter medium 16 of the filter 13 housed in the filter housing portion 21 in the second stage from the top, it further passes through the box-shaped filter medium 14. As a result, also in the second-stage filter housing part 21 from the top, the dampening water is physically filtered by the polymer filter medium 16 and the box-shaped filter medium 14 in the same manner as in the uppermost filter housing part 21. Fine impurities such as fine ink / oil particles (which are not dissolved in the fountain solution and are larger than the filter mesh formed by the polymer filter medium 16 and the box-shaped filter medium 14 of the filter 13), paper powder, powder, etc. Removed. In addition, the pigment or (and) the dye dissolved in the dirty dampening water moves toward the polymer filter medium 16 and dissolves in the polymer filter medium 16, thereby the dampening water from the dirty dampening water. The pigment or (and) dye dissolved in is removed.

  Thereafter, in the same manner, the dampening water after use falls naturally from the upper filter housing portion 21 to the lower filter housing portion 21 through the discharge port 22 as shown by the arrows in FIGS. The state impurities are filtered and the dissolved pigment or / and dye is transferred into the polymer filter media 16.

  The filtered and purified fountain solution that has reached the discharge port 22 at the bottom of the lowermost filter housing portion 21 is sent to the fountain solution storage tank 12 through the pipe 32 as indicated by arrow B in FIG. Further, the water is returned from the dampening water storage tank 12 to the water boat 2.

  As described above, the pigment or (and) the dye dissolved in the fountain solution moves into the polymer filter medium 16 and is removed, so that the fountain solution becomes colorless and transparent water from the colored state. .

  In this example, the pigment having the following chemical structural formula of yellow ink, which is dissolved in the fountain solution and cannot be removed by filtration,

Pigment of the following chemical structural formula of red ink,

And pigment with the following chemical structural formula of indigo ink,

Was transferred to the inside of the polymer filter medium 16 and removed.

  The black pigment made of black ink carbon has large particles and is completely insoluble in the dampening water. Therefore, the black pigment is caught by the filter formed by the polymer filter medium 16 and the box-shaped filter medium 14 of the filter 13 and physically filtered. By doing so, it is removed from the dirty fountain solution.

  As the usage time elapses, the filter 17 becomes clogged and the filtration capacity decreases. Further, when the pigment or (and) dye dissolved in the polymer filter medium 16 becomes saturated, the pigment or (and) dye dissolved in the fountain solution cannot be removed any more. In this embodiment, the polymer filter medium 16 can be easily replaced with a new one together with the entire filter 17 as follows. That is, the upper plate 23b is rotated as indicated by the one-dot chain line position in FIGS. 8 and 9 to open the horizontal opening portions 28 of the respective stages, so that the filter 17 passes through the horizontal opening portions 28. Can be replaced very easily.

  In addition, in the case of a filtration device of a type in which pressure is applied to the filtration target liquid and passed through the filter, such as a pincushion filter that is generally used conventionally, the contact time between the filter medium and the filtration target liquid is shortened. When the filter medium is also made to function as a solid organic substance as in the examples, it is considered that it is disadvantageous for the migration of the dissolved pigment or (and) the dye to the solid organic substance. However, in this embodiment, the dampening water passes through the filter 17 in a naturally falling manner without being pressurized, and the contact time between the dampening water and the polymer filter medium 16 (solid organic matter) is increased. Since it can be lengthened, the migration of the dissolved pigment or (and) dye to the polymer filter medium 16 (solid organic matter) can be more effectively realized.

  In the above embodiment, the sheet-like foam polymer is cut into a band or string as a solid organic substance that absorbs the pigment or (and) the dye dissolved in the fountain solution. In the invention, the solid organic material does not necessarily have to be a polymer, may not be a foam, and may be used in a shape other than a band or string. However, when the solid organic material is cut into a band-like or string-like shape from the sheet-like foam polymer as in the above-described example and used as the polymer filter medium 16, the solid organic substance can also function as a filter medium. In addition, handling of the solid organic matter and the filter medium becomes easy.

  However, in the present invention, if the solid organic material is used in the form of particles, the surface area per unit weight of the solid organic material can be increased, and the absorption capacity of the pigment or (and) dye can be increased.

  In the above-described embodiment, the solid organic substance (polymer filter medium 16) that absorbs the pigment or (and) the dye dissolved in the fountain solution also functions as a filter medium. The solid organic material may not function as a filter medium.

  Moreover, in the said Example, the solid organic substance (polymer filter medium 16) is provided in the filtration and purification apparatus 11, and the filtration and purification apparatus 11 is a physical filtration function and the pigment or (and) dye which is melt | dissolving in dampening water. However, the dampening water purification device and the filtration device for holding the solid organic matter are provided separately, and the dampening water purification device is dissolved in the dampening water. Only the function of removing pigments and / or dyes, and the filtering device may perform only the physical filtering function of removing insoluble impurities.

  Moreover, in the said Example, although only 1 type of solid organic substance is used, according to the kind of pigment or (and) dye, you may use multiple types of solid organic substance simultaneously.

  As described above, the fountain solution purifying apparatus and method for the offset printing press according to the present invention provides the fountain solution purifying for the offset printing press that removes the pigment or (and) the dye dissolved in the fountain water from the printing ink. It is useful as an apparatus and purification method.

DESCRIPTION OF SYMBOLS 1 Ink and dampening water supply mechanism 2 Water ship 9 Intermediate tank 10 Primary processing apparatus 11 Filtration and purification apparatus 12 Dampening water storage tank 13 Filter 16 Polymer filter medium (solid organic matter)

A dampening water purifying device for an offset printing machine according to the present invention comprises:
A dampening water purification device for an offset printing machine, which is placed in a dampening water circulation system for filtering dirty dampening water used in an offset printing machine and returning it to the offset printing machine,
The solid organic matter having higher compatibility with the fountain solution than the fountain solution is exchangeably retained with respect to the pigment or / and the dye of the printing ink to be removed, and the soiled fountain solution is brought into contact with the solid organic matter. The pigment or (and) the dye dissolved in the dirty dampening water is moved from the dampening water into the solid organic substance and dissolved in the solid organic substance, thereby The pigment or / and the dye dissolved in the fountain solution are removed from the fountain solution.

Further, a dampening water purification method for an offset printing machine according to the present invention includes:
In the dampening water circulation system for filtering the dirty dampening water used in the offset printing machine and returning it to the offset printing machine,
A solid organic material having a higher compatibility with the fountain solution than the fountain solution with respect to the pigment or / and dye of the printing ink to be removed is dissolved in the fountain solution by bringing the solid organic material into contact with the fountain solution. A pigment or (and) a dye that moves from the fountain solution into the solid organic matter and dissolves in the solid organic matter, whereby the pigment is dissolved in the fountain solution from the dirty dampening solution Or (and) to remove the dye.

In the present invention, a solid organic substance having a higher compatibility with the printing ink pigment or (and) dye to be removed than the fountain solution is dissolved in the fountain solution by contacting with the dirty fountain solution. The pigment or (and) the dye is transferred from the fountain solution into the solid organic matter and dissolved in the solid organic matter, whereby the pigment or (and ) Remove the dye.

In the present invention, when the pigment or (and) the dye comes into contact with the solid organic matter, it is more comfortable to exist in the solid organic matter than so-called dampening water. It moves from the fountain solution that has been used to the solid organic matter and dissolves in the solid organic matter. Depending on the principle that the adsorbent, such as activated carbon, adsorbs other substances, or the principle that a conventional filtration device physically catches the filter material constituting the filter medium and captures it, the pigment or ( It should be noted that and) the dye is removed.

As described above, the fountain solution is in an environment in which various impurities such as oil-based ink, solvent, oil, paper powder , and powder are mixed and the original function is hindered.

At the same time, the polymer filter medium 16 (solid organic material) is made of polyurethane and is more compatible with the pigment or (and) dye dissolved in the fountain solution than in the fountain solution. The pigment or (and) the dye which is moving moves toward the polymer filter medium 16 and dissolves inside the polymer filter medium 16. As a result, the pigment or (and / or dye) dissolved in the fountain solution is removed from the dirty fountain solution.

The dampening water that has passed through the uppermost filter housing portion 21 naturally falls into the second-stage filter housing portion 21 from the top through the discharge port 22 at the bottom of the filter housing portion 21. Then, while passing through the polymer filter medium 16 in contact with the polymer filter medium 16 of the filter 13 housed in the filter housing portion 21 in the second stage from the top, it further passes through the box-shaped filter medium 14. As a result, also in the second-stage filter housing part 21 from the top, the dampening water is physically filtered by the polymer filter medium 16 and the box-shaped filter medium 14 in the same manner as in the case of the uppermost filter housing part 21. Fine impurities such as fine ink / oil particles (which are not dissolved in the fountain solution and are larger than the filter mesh formed by the polymer filter medium 16 and the box-shaped filter medium 14 of the filter 13), paper powder, powder, etc. Removed. In addition, the pigment or (and) the dye dissolved in the dirty dampening water moves toward the polymer filter medium 16 and dissolves in the polymer filter medium 16, thereby the dampening water from the dirty dampening water. The pigment or (and) dye dissolved in is removed.

Thereafter, in the same manner, the dampening water after use falls naturally from the upper filter housing portion 21 to the lower filter housing portion 21 through the discharge port 22 as shown by the arrows in FIGS. The state impurities are filtered and the dissolved pigment or / and dye is transferred into the polymer filter media 16.

As described above, the pigment or (and) the dye dissolved in the fountain solution moves into the polymer filter medium 16 and is removed, so that the fountain solution becomes colorless and transparent water from the colored state. .

Was moved into the polymer filter medium 16 and removed.

In addition, in the case of a filtration device of a type in which pressure is applied to the filtration target liquid and passed through the filter, such as a pincushion filter that is generally used conventionally, the contact time between the filter medium and the filtration target liquid is shortened. When the filter medium also has a function as a solid organic substance as in the examples, it is considered that it is disadvantageous for the movement of the dissolved pigment or (and) the dye to the solid organic substance. However, in this embodiment, the dampening water passes through the filter 17 in a naturally falling manner without being pressurized, and the contact time between the dampening water and the polymer filter medium 16 (solid organic matter) is increased. Since it can be lengthened, the movement of the dissolved pigment or (and) dye to the polymer filter medium 16 (solid organic matter) can be more effectively realized.

Claims (14)

A dampening water purification device for an offset printing machine, which is placed in a dampening water circulation system for filtering dirty dampening water used in an offset printing machine and returning it to the offset printing machine,
The solid organic matter having higher compatibility with the fountain solution than the fountain solution is exchangeably retained with respect to the pigment or / and the dye of the printing ink to be removed, and the soiled fountain solution is brought into contact with the solid organic matter. The pigment or (and) the dye dissolved in the dirty dampening water is transferred from the dampening water to the inside of the solid organic matter and dissolved in the solid organic matter, whereby the soiled A dampening water purifier for an offset printing machine that removes pigments and / or dyes dissolved in the dampening water from the dampening water.   The dampening water purification apparatus for an offset printing press according to claim 1, wherein the solid organic matter is a polymer.   The dampening water purification apparatus for an offset printing machine according to claim 2, wherein the polymer is polyurethane.   The function as a filtration apparatus which physically filters the dampening water, and the solid organic matter also functions as a filter medium for physically filtering the dampening water. The dampening water purification apparatus for offset printing machines as described.   The dampening water purification apparatus for an offset printing press according to any one of claims 1 to 4, wherein the dampening water is allowed to pass between the solid organic substances without being pressurized.   The dampening water purification apparatus for an offset printing machine according to any one of claims 1 to 5, wherein the solid organic matter is in the form of a band or a string.   The dampening water purification apparatus for an offset printing machine according to any one of claims 1 to 5, wherein the solid organic matter is granular. In the dampening water circulation system for filtering the dirty dampening water used in the offset printing machine and returning it to the offset printing machine,
A solid organic material having a higher compatibility with the fountain solution than the fountain solution with respect to the pigment or / and dye of the printing ink to be removed is dissolved in the fountain solution by bringing the solid organic material into contact with the fountain solution. A pigment or (and) a dye that is transferred from the fountain solution to the inside of the solid organic matter and is dissolved in the solid organic matter, whereby the pigment is dissolved in the fountain solution from the dirty dampening solution Or (and) a dampening water purification method for offset printing presses that removes the dye.   The dampening water purification method for an offset printing press according to claim 8, wherein the solid organic matter is a polymer.   The dampening water purification method for an offset printing press according to claim 9, wherein the polymer is polyurethane.   The dampening water purification method for an offset printing machine according to any one of claims 8 to 10, wherein the solid organic matter also functions as a filter medium for physically filtering the dampening water.   The dampening water purification method for an offset printing machine according to any one of claims 8 to 11, wherein the dampening water is passed between the solid organic substances without being pressurized.   The dampening water purification method for an offset printing machine according to any one of claims 8 to 12, wherein the solid organic matter is in the form of a band or a string. The dampening water purification method for an offset printing press according to any one of claims 8 to 12, wherein the solid organic matter is granular.

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