JP2001315312A - Waste liquid recycling device for printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste liquid recycling device for a printer without increasing in its size. SOLUTION: A container 2 of the waste liquid recycling device 1 is adjacently divided into a recovery tank 8 for recovering an ink pigment and a storage tank 9 for storing a recycled cleaning liquid 20. The container 2 has a filter 12 for passing only a cleaning liquid 20 without passing the ink pigment 18 through a partition wall 13 for partitioning both the tanks 8 and 9. A fixed electrode 4 of a semicircular arc-like section formed of a grounded metal roller 3 and a thin plate is disposed in the tank 8. In this embodiment, an interval therebetween is set to 10 mm. A blade 5 is pressed against an outer peripheral surface of the roller 3, coupled to the blade 5 and arranged with an ink pigment recovery container 6. A drain valve 10 is provided at a bottom side face of the tank 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for regenerating waste liquid generated when a blanket cylinder or an impression cylinder of a printing press is washed. More specifically, the present invention relates to a waste liquid regenerating apparatus for efficiently recovering a charged ink pigment in a short time.

[0002]

2. Description of the Related Art Conventionally, waste liquids generated during cleaning of a blanket cylinder and an impression cylinder of a printing press are directly discarded, so that disposal costs such as waste liquid treatment have been required due to environmental problems. Also,
Since a large amount of cleaning liquid is used to clean the blanket cylinder and the like, there has been a problem that running costs are increased. Therefore, recently, an attempt has been made to reprocess the waste liquid and reuse the cleaning liquid. One example is the so-called sedimentation method, and FIG. 4 schematically shows a waste liquid reprocessing apparatus used in the sedimentation method.

As shown in the figure, a conventional waste liquid reprocessing device 1
Is provided with a container 2 for storing the cleaning waste liquid 16, a bottom discharge pipe 24 is connected to the bottom of the container 2, and a side discharge pipe 25 is connected to a side wall of the container 2. These pipes 24, 25
Among them, a concentrated waste liquid recovery container 26 is disposed at an outlet of the bottom discharge pipe 24, and a regenerated cleaning liquid recovery container 27 is disposed at an outlet of the side discharge pipe 25. An opening / closing valve 14 is connected to a passage of one bottom discharge pipe 24, and an opening / closing valve 15 is connected upstream to a passage of the other side discharge pipe 25.
, And the filter 12 is disposed downstream of the filter.

With such a configuration, the waste liquid reprocessing apparatus 1 stores the waste liquid 16 after washing the rollers of the printing press in the container 2 and disposes a chemical that promotes the sedimentation of the ink pigment 18 into the waste liquid 16.
To settle the ink pigment 18 to the bottom of the container 2. The sedimented precipitated ink pigment, that is, the concentrated waste liquid 19 is supplied from the bottom discharge pipe 24 to the concentrated waste liquid recovery solution 26.
The regenerated cleaning liquid 20 from which the ink pigment 18 has been removed is filtered by filtering the supernatant liquid of the waste liquid 16 from the side discharge pipe 25 with the filter 12.
To be collected. The regenerated cleaning solution 20 thus obtained is reused. However, in this method, the purity of the reprocessing cleaning liquid 20 is low, and depending on the combination of the ink and the cleaning liquid,
The sedimentation of the ink pigment 18 is insufficient and the filter 12
However, since the filter is clogged, there is a problem that the filter 12 is frequently replaced or cleaned.

Therefore, using an apparatus as shown in FIG.
There is also an attempt to recover the ink pigment by electrophoresis by applying an electric field using the fact that the ink pigment is charged
(Japanese Patent Application No. 11-297540). In the waste liquid regenerating apparatus 1 of the present printing press, a metal roller 3 installed on the ground side of a high-voltage power supply is disposed inside a container 2. A metal electrode 4 is disposed at a predetermined distance from the lower half of the metal roller 3. The fixed electrode 4 is immersed in the waste liquid 16 to such an extent that its upper end is hidden. A blade 5 is pressed against the metal roller 3, and an ink pigment recovery container 6 is connected to the blade 5. Here, the metal roller 3 was made of stainless steel, and the fixed electrode 4 was made of a copper plate. The blade 5 was also made of stainless steel and grounded.

[0006] Waste liquid regeneration is performed in the following procedure. The metal roller 3 is rotated while the metal roller 3 is grounded and a high positive voltage is applied to the fixed electrode 4. When a positive high voltage is applied to the fixed electrode 4, the cleaning liquid and water 17 are first separated by an electric field between the metal roller 3, and then the ink pigment 18 is electrophoresed and adheres to the metal roller 3. Since the metal roller 3 runs counterclockwise in FIG. 5, the ink pigment 18 attached to the metal roller 3 comes out of the waste liquid 16
It is scraped off by the blade 5 and put into the ink pigment recovery container 6. On the other hand, the water 17 collected at the bottom of the container 2 is periodically removed by the drain valve 10.

[0007]

However, in an actual printing press cleaning system, cleaning is usually performed at a cycle of 30 minutes, and waste liquid flows into the regenerating device, so that the ink pigment is removed in a short time. There is a need. In addition, in order to reuse the regenerated cleaning solution, the capacity of the regenerating apparatus needs to be large with some allowance.However, as the capacity of the apparatus increases, it takes time for the ink pigment to diffuse into the electric field application area. As a result, there arises a problem that the reproduction speed is reduced, the rollers and electrodes are increased, and the apparatus cost is increased. The present invention has been made in view of the above problems, and an object of the present invention is to provide a waste liquid reclaiming apparatus for a printing machine without increasing the size of the apparatus.

[0008]

In order to achieve the above object, the present invention divides the container of the waste liquid regenerating apparatus into a collecting tank for collecting the ink pigment and a storage tank for storing the regenerated washing liquid. A filter that allows only the cleaning liquid to pass through without passing the ink pigment is provided between them. Further, the present invention divides the container of the waste liquid regenerating apparatus into a collecting tank for collecting the ink pigment and a storage tank for storing the regenerated cleaning liquid, and providing an opening electrode having a large number of openings between both tanks, A voltage is applied to the opening electrode to cause the charged ink pigment to be electrophoresed on the side of the collection tank, whereby the ink pigment is confined in the collection tank, and only the cleaning liquid flows into the storage tank. In the present invention, the opening electrode can be integrated with the fixed electrode for collecting ink pigment in the collecting tank.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A waste liquid regenerating apparatus for a printing press according to an embodiment of the present invention will be described below with reference to FIG. FIG. 1 shows the configuration of the waste liquid regeneration device of the present invention. The container 2 of the waste liquid regenerating apparatus 1 has a collection tank 8 for collecting the ink pigment.
The waste liquid 16 containing the ink pigment, water, and the cleaning liquid discharged after cleaning the printing press is supplied to the recovery tank 8. It is configured as follows. The container 2 is provided with a partition wall 13 for partitioning the two tanks 8 and 9 side by side in a horizontal direction.
A filter 12 that allows only the passage is provided. Filter 12
The filter 12 is provided on a part of the upper side of the partition wall 13. However, the filter 12 can be provided on the partition wall 13 at a height such that water at the bottom of the recovery tank 8 does not flow into the storage tank 9.

In the recovery tank 8, the grounded metal roller 3
A fixed electrode 4 having a semicircular cross section formed of a thin plate and facing a substantially lower half thereof is provided at a predetermined interval. The metal roller 3 can be rotated counterclockwise by driving means (not shown). In the present embodiment, the distance between the metal roller 3 and the fixed electrode 4 is set to 10 mm, and the fixed electrode 4 is immersed in the waste liquid 16 to such an extent that its upper end is hidden. A high-voltage power supply 7 is provided outside the container 2. The + (positive) side is connected to the fixed electrode 4, and the − (negative) side is connected to the metal roller 3.

A blade 5 is pressed against the outer peripheral surface of the metal roller 3 having a circular cross section, and the position of the blade 5 is arranged on the liquid surface of the waste liquid 16. The ink pigment recovery container 6 is also disposed on the liquid level of the waste liquid 16. A drain valve 10 that can be freely opened and closed is provided on the bottom side surface or the bottom of the collection tank 8.
Is provided. In the present embodiment, the metal roller 3 and the fixed electrode 4 are made of stainless steel. The blade 5 was made of plastic.

The regeneration of the cleaning liquid 20 in the waste liquid regeneration apparatus 1 is performed according to the following procedure. The metal roller 3 is rotated while the metal roller 3 is grounded and a high positive voltage is applied to the fixed electrode 4. Here, the voltage applied to the fixed electrode 4 was set to +10 kV by the high voltage power supply 7. The inventors' original research has found that the ink pigment 18 is positively charged and electrophoreses in a solution. Further, when a high voltage is applied, the water 17 contained in the waste liquid 16 is separated in a short time, and has a phenomenon that it sinks to the bottom of the container 2 because the specific gravity is larger than that of the cleaning liquid. Therefore, when a high positive voltage is applied to the fixed electrode 4, the waste liquid 16 and the water 17
Then, the ink pigment 18 is electrophoresed and adheres to the metal roller 3. Since the metal roller 3 rotates counterclockwise in FIG. 1, the ink pigment 18 attached to the metal roller 3 comes out of the waste liquid 16, is scraped off by the blade 5, and is put into the ink pigment recovery container 6. . On the other hand, the water 17 collected at the bottom of the container 2
Is removed periodically.

On the other hand, between the tanks 8 and 9, the ink pigment 1 is provided.
A filter 12 is provided that allows only the cleaning liquid to pass through without passing through the storage tank 8.
Has been accumulated. The filter 12 has a durable glass fiber qualitative filter paper GS-25 (Advantech Toyo Co., Ltd.)
Was used. Separation can be performed only by the filter 12 without performing the recovery of the ink pigment by the recovery tank 8, but it has been confirmed by experiments that the filter 12 is clogged in an extremely short period of time. I have. In addition, since it has been found through experiments that the filter 12 is easily clogged when waste liquid is put into the collection tank 8 in a state where nothing is put in the storage tank 9, first, the storage tank 9 contains: We decided to keep fresh washing liquid. In this way, the waste liquid 16 coming out of the cleaning device first enters the recovery tank 8 of the present waste liquid regenerating apparatus, where the ink pigment is removed therefrom. Go to 9. Cleaning liquid 2 stored in storage tank 9
Zero is pumped into the cleaning system and reused when cleaning blankets and impression cylinders.

[Example 1] Next, the results of a test performed using the waste liquid regenerating apparatus will be described. As the waste liquid regenerating apparatus, the above-described waste liquid regenerating apparatus 1 was used. (Waste liquid regeneration device) Gap between fixed electrode 4 and metal roller 3: 10 mm Applied voltage between fixed electrode 4 and metal roller 3: +10 kV The following five types of sheet ink were used as the (ink) ink. . Hi-Echo MZ (Toyo Ink Co., Ltd.) Geos-GN (Dai Nippon Ink Co., Ltd.) Supertech Plus H (T & K Co., Ltd.) Diatone M (Sakata Inx Co., Ltd.) Cervo Y (Tokyo Ink Co., Ltd.) Made)

(Cleaning liquid) The following five kinds of cleaning liquids were used. DAICLEAN (manufactured by Dainippon Ink Co., Ltd.) AUTO CLEAN (manufactured by Niken Kagaku Co., Ltd.) BRACLIN S (manufactured by Nikka Corporation) Print Cleaner (manufactured by Toyo Ink Co., Ltd.) Super Clean (manufactured by Inktec Co., Ltd.) ) For 25 types combining these, indigo, red, yellow,
An experiment was carried out by adding 20% water to a solution obtained by uniformly mixing the four black inks and diluting them to 1% with a washing liquid to prepare a simulated waste liquid.

As a result, the inks were Geos-GN (manufactured by Dainippon Ink Co., Ltd.) and Cervo Y (manufactured by Tokyo Ink Co., Ltd.),
The cleaning liquid is a metal roller of the ink pigment 18 in six types of simulated waste liquids combining Auto Clean (manufactured by Niken Kagaku Co., Ltd.), Braclin S (manufactured by Nikka Corporation) and Print Cleaner (manufactured by Toyo Ink Co., Ltd.). 3 was slightly weaker and the adhered ink pigment 18 tended to fall off. However, in all combinations, water 17
It was confirmed that the ink pigment 18 and the water 17 could be separated and recovered by various steps such as separation of the ink pigment 18, adhesion of the ink pigment 18 to the metal roller 3, rotation of the metal roller 3, and scraping by the blade 5.

In a normal printing press, each time a series of printing is completed, a blanket cylinder or an impression cylinder of the printing press uses a cleaning solution of a petroleum-based solvent for removing ink pigments and water for removing paper dust. It is inevitable that the waste liquid is mixed with conductive water in addition to the ink component and the insulating cleaning liquid. From common sense, it is considered that charged particles in a conductive liquid do not electrophores efficiently, but when an electric field is applied, the insulating cleaning liquid and the conductive water separate, and the ink pigment becomes It was found that it was unevenly distributed in the washing solution. In addition, since the fact that the ink pigment is charged is a phenomenon uniquely discovered by the inventor and is not generally known, no attempt has been made in the past, and the uniqueness of the present invention is as follows. Based on a novel discovery phenomenon unique to the inventor.

According to the present embodiment, the waste liquid regenerating apparatus is divided into a recovery tank and a storage tank, and the ink pigment is recovered from the concentrated waste liquid in a small-capacity recovery tank. The apparatus becomes compact and the apparatus cost can be reduced. Further, since the storage tank always contains a regenerated clean washing liquid, the washing liquid can be used at any time even if the time interval of washing greatly varies, and the flexibility of the apparatus is improved.
Also, unlike the sedimentation method, it is not necessary to replace the filter frequently, and the components are automatically separated only by applying a voltage, so that the maintenance becomes easy.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 shows the configuration of the waste liquid regeneration device of the present invention. The container 2 of the waste liquid regenerating apparatus is divided by a partition wall 13 into a collecting tank 8 for collecting the ink pigment and a storage tank 9 for storing the regenerated washing liquid 20. In the collecting tank 8, a grounded metal roller is provided. A fixed electrode 4 is provided at a predetermined distance from the lower electrode 3 and substantially the lower half thereof. A part of the fixed electrode 4, that is, an end on the side of the partition wall 13 is an open electrode 11 having a large number of openings, and that part is a partition wall of the collection tank 8 and the storage tank 9. Therefore, the opening electrode 11 defines the collection tank 8 and the storage tank 9 as a part of the partition wall 13. When a positive voltage is applied to the opening electrode 11, the positively charged ink pigment is pushed toward the metal roller and can be prevented from flowing into the storage tank 9. In this experiment, a punched wire mesh and a mesh-shaped wire mesh were used for the opening electrode 11, and the distance between the metal roller 3 and the fixed electrode 4 was set to 10 mm by being integrated with the fixed electrode 4.

At this time, the permeation inhibition ability of the ink pigment was evaluated by changing the size of the opening of the opening electrode 11 in various ways. It was found that the amount of the ink pigment flowing into the side could be made sufficiently small. However, it is considered that if the distance between the electrodes is reduced, the size of the opening must also be reduced. When the distance between electrodes is large, 1 mm considering the distribution of equipotential surfaces
Although it is possible to increase the size, it is not preferable to increase the size in consideration of the influence of the flow of the liquid. In order to reliably prevent the inflow of the ink pigment into the storage tank 9, it is desirable that the thickness be about 1 mm or less.

The process of recovering the ink pigment is exactly the same as in the first embodiment. Further, an experiment of waste liquid regeneration was performed using a combination of various inks and cleaning liquids in the same manner as in the above embodiment, and the recovery characteristics were as good as in the first embodiment. In this manner, the waste liquid 16 coming out of the cleaning device first enters the recovery tank 8 of the present waste liquid regenerating device, where the ink pigment 18 is removed therefrom, and the cleaning liquid containing no ink pigment passes through the opening electrode 11 to the storage tank 9. Go to
The cleaning liquid 20 stored in the storage tank 9 is supplied to the cleaning system by a pump when cleaning the blanket and the impression cylinder, and is reused.

Next, a third embodiment of the present invention will be described with reference to FIG. In the present embodiment, an opening electrode 11 is separately provided between the collection tank 8 and the storage tank 9 as a partition wall for partitioning the collection tank 8 and the storage tank 9 in the horizontal direction, and the opening electrode 11 is connected to the positive side of the high-voltage power supply 7a. I have. In the present embodiment, the opening electrode 11 is provided on the entire partition wall. However, the opening electrode 11 may not necessarily be provided entirely but may be provided partially. The voltage of the high-voltage power supply 7a is higher than the applied voltage of one high-voltage power supply 7. Thereby, the ink pigment can be electrophoresed toward the recovery tank 8. Other configurations such as the metal roller 3 and the fixed electrode 4 are the same as those of the first embodiment. According to the configuration of the waste liquid reprocessing apparatus 1, a verification experiment was performed by applying a voltage of +15 kV to the opening electrode 11, and as a result, the ink pigment 18 can be recovered as in the case of the second embodiment, and the ink in the storage tank 9 can be recovered. There was almost no diffusion of the pigment 18. But,
In this device configuration, another one is provided outside the high-voltage power supply 7 for the fixed electrode 4.
Since two high-voltage power supplies 7a are required, the second embodiment will be superior in terms of cost and simplicity of the device configuration.

According to the present invention, the waste liquid regeneration device is divided into a recovery tank and a storage tank, and the ink pigment is recovered from the concentrated waste liquid in a small-capacity recovery tank.
Further, the apparatus becomes compact and the apparatus cost can be reduced. Further, since the storage tank always contains a regenerated clean washing liquid, the washing liquid can be used at any time even if the time interval of washing greatly varies, and the flexibility of the apparatus is improved. Further, since the filter 12 is not used unlike the first embodiment, there is no need to worry about clogging of the filter, and maintenance becomes easy.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited thereto, and various modifications can be made based on the technical concept of the present invention. For example, in the above embodiment, the aperture electrode 11 and the filter 12
Are provided separately, but these can also be used together. That is, the filter 12 may be provided on the surface of the opening electrode 11 or two partition walls may be provided, and the opening electrode 11 and the filter 12 may be separately provided.

[0025]

As described above, according to the present invention, the container for collecting the waste liquid containing the ink pigment, water, and the cleaning liquid discharged after washing the printing press is provided with a collection tank for collecting the ink pigment. Since the partition wall is divided into a storage tank for storing the regenerated cleaning liquid and a filter for passing the cleaning liquid through the partition wall without passing the ink pigment, the regenerated cleaning liquid can be stored on the storage tank side. Was. Further, according to the present invention, there is provided a container for collecting a waste liquid containing an ink pigment, water, and a cleaning liquid discharged by washing a printing press, and a pair of electrodes is provided in the container, and one of the electrodes is provided. In the waste liquid regenerating apparatus for adhering the ink pigment by electrophoresis, the inside of the container is divided into a collection tank and a storage tank by a partition wall, and the electrodes are arranged in the collection tank. An opening electrode having an opening through which the cleaning liquid is formed is provided on the wall, and by applying a voltage to the opening electrode, the ink pigment in the recovery tank is electrophoresed in a direction opposite to the side of the opening electrode, and is transferred to the storage tank. Since the inflow of the ink pigment is prevented, the ink pigment is collected in the collection tank, and the regenerated cleaning liquid can be more effectively regenerated in the storage tank. In another embodiment of the present invention, the other electrode of the pair of electrodes is configured as a part of the aperture electrode, so that the number of electrodes can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a waste liquid regenerating apparatus of a printing press according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a waste liquid regenerating apparatus of a printing press according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a waste liquid regenerating apparatus according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventional waste liquid reprocessing device using a sedimentation method.

FIG. 5 is a configuration diagram of a waste liquid regenerating apparatus for a printing press according to the prior art of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waste liquid reproduction apparatus 2 Container 3 Metal roller 4 Fixed electrode 5 Blade 7 High voltage power supply 8 Recovery tank 9 Storage tank 10 Drain valve 11 Open electrode 12 Filter 16 Waste liquid 17 Water 18 Ink pigment 20 Regeneration cleaning liquid

 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Shoichi Aoki 5007 Itozakicho, Mihara City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd.Mihara Works Co., Ltd. (72) Inventor Masayuki Eda 5007 Itozakicho, Mihara City, Hiroshima Prefecture Mitsubishi Heavy Industries Mihara, Ltd. (72) Inventor Minoru Sueda 5007 Itozaki-cho, Mihara-shi, Hiroshima Prefecture Mitsubishi Heavy Industries Mihara Works F-term (reference) 2C250 EA49 FA09 FA11 FB01 4D061 DA08 DB15 DC13 EA10 EA13 EB19 EB31 EB33

Claims (3)

[Claims] 1. A container for collecting a waste liquid containing an ink pigment, water, and a washing liquid discharged after washing a printing press, the container having a partition wall for collecting the ink pigment, and a tank for collecting the regenerated washing liquid. A wastewater regenerating apparatus for a printing press, wherein the filter is divided into a storage tank and a filter that passes the cleaning liquid to the storage tank without passing the ink pigment through the partition wall. 2. A container for recovering a waste liquid containing an ink pigment, water, and a cleaning liquid discharged after washing a printing press, a pair of electrodes provided in the container, and one of the electrodes being provided with the ink. In a waste liquid regenerating apparatus for attaching a pigment by electrophoresis, the inside of the container is divided into a collection tank and a storage tank by a partition wall,
Along with disposing the electrode in the collection tank, providing an opening electrode having an opening through which the cleaning liquid passes through the partition wall, and applying a voltage to the opening electrode, the ink pigment in the collection tank is placed on the side of the opening electrode. A wastewater regenerating device for a printing press, wherein electrophoresis is performed in a direction opposite to that of the above, so as to prevent the inflow of the ink pigment into the storage tank. 3. The apparatus according to claim 2, wherein the other of the pair of electrodes is configured as a part of the opening electrode.