JP2004097968A - Filtration apparatus for machine water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filtration apparatus for machine water which has a high filtration performance and is capable of recycling a filter. <P>SOLUTION: Plural pieces of porous volcanic rock 10 are stored in a vessel 11. While machine water containing the soiling flows from an inflow port 12 to an outflow port 13, the soiling such as emulsified matter and fine particles in the machine water is adsorbed into holes of the porous volcanic rock 10 and is removed from the liquid. The volcanic rock 10 having the soiling adsorbed by the hole surface is taken out, is heated or is washed and, thereby, can be recycled. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to circulating water for a machine (water that flows inside or around the machine for cooling, washing, etc., including cases where various additives are added. This is hereinafter referred to as “machine water”). The present invention relates to a filtration device for mechanical water used in a circulating reuse device or a wastewater treatment device. Such a filtration device can be suitably used, for example, in a circulating reuse device for dampening water for a lithographic printing press.
[0002]
[Prior art]
In lithographic printing, a water film is formed on non-image portions (blank paper portions) other than the image portions constituting characters and pictures on the plate surface, and the ink as oil and the water film on the non-image portions are formed. By utilizing the repelling property, ink is applied only to the image area. As the liquid forming the water film, water to which an additive (for example, a water-soluble polymer such as gum arabic or carboxymethylcellulose) is added is generally used to enhance the above-mentioned effect. This is called "fountain solution".
[0003]
In the printing process, stains such as emulsified ink and fine paper powder are mixed into the dampening solution. Therefore, the used dampening solution is recovered from the printing press, filtered (often in addition to cooling), and sent to the printing press again to recycle the dampening water. In a conventional circulating reuse device for dampening water, a paper filter is mainly used.
[0004]
In general, as a filter for filtering water or the like, there are various filters such as cloth and metal other than paper. For example, it has been reported that pumice is used to purify water in a bathtub or water in rivers and lakes (for example, see Patent Documents 1 and 2).
[0005]
[Patent Document 1]
JP-A-7-251188 ([0006] etc.)
[Patent Document 2]
JP-A-7-80444 ([0018] to [0020])
[0006]
[Problems to be solved by the invention]
The paper filter used in the dampening water circulating cooling device is clogged with dirt and must be periodically replaced. For example, if the printing press is operated continuously, the filters must be replaced every few days. This filter replacement requires a lot of time and labor, and the filter used once cannot be reused. Therefore, the filter has to be discarded, which is a problem in terms of cost.
[0007]
Further, in the case of a conventional paper filter, even if the filter is periodically replaced, it has not been possible to completely remove emulsification of ink and dirt such as paper dust from circulating water. Therefore, when used for 1 to 3 weeks, the circulating water itself had to be replaced. This work requires more time and effort than replacing the filter, and the printing press must be stopped during the work, resulting in a large loss in efficiency of the printing work.
[0008]
On the other hand, in Patent Documents 1 and 2, the target dirt is suspended algae, turbid or organic substances, and impurities in a bathtub. Although pumice is effective in removing these stains, emulsified inks and oils that are mixed in a large amount in machine water have different adsorption characteristics from those of floating algae, etc. It was thought that a sufficient filtration effect could not be expected. Therefore, it has not been used as a filter for mechanical water.
[0009]
The present invention has been made to solve such a problem, and an object of the present invention is to significantly reduce the frequency of filter replacement, enable reuse of the filter, and provide a dampening machine for a printing press. It is an object of the present invention to provide a filtration device that can semi-permanently eliminate the need to replace a circulating liquid or greatly reduce the frequency of replacement in a liquid circulation device such as a water circulation cooling filtration device. This filtering device is not limited to the dampening water circulating cooling and filtering device for a printing press described above, and can be applied to various devices requiring liquid filtration, such as a circulating device for cooling water of various machines.
[0010]
[Means for Solving the Problems]
The filtration device for mechanical water according to the present invention made in order to solve the above problems,
a) a plurality of porous volcanic rocks;
b) a container for storing the volcanic rock;
c) a liquid inlet and a liquid outlet provided in the container;
It is characterized by having.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The mechanical water filtration device according to the present invention will be described with reference to FIG. The filter in the filtering device of the present invention is a porous volcanic rock. Such volcanic rocks include, for example, basalt, andesite, rhyolite, dacite, and the like. Only one type of these volcanic rocks may be used, or two or more types may be mixed and used. The density of the volcanic rock used is desirably 1.5 g / cm ³ or less, and more desirably less than 1.0 g / cm ³ . Since the density of the volcanic rock containing no pores is 2.6 to 3.0 g / cm ³ , this condition means that about 50% or more of the volume of the volcanic rock is pores. When the density of the volcanic rock to be used is less than 1.0 g / cm ^3, only the volcanic rock floating on water may be used, and the selection of the volcanic rock is easy.
[0012]
As shown in FIG. 1, a plurality of porous volcanic rocks 10 are stored in a container 11. The porous volcanic rock 10 may be stored directly in a container. Alternatively, the porous volcanic rock 10 may be stored in a basket or net made of metal or plastic, and the basket or net may be stored in the container 11. FIG. 1 shows a configuration in which a porous volcanic rock 10 is stored in a cage 14 as an example. However, baskets and nets must be capable of transmitting the mechanical water stains (eg, emulsified ink and paper powder in the case of the printing dampening solution) to the porous volcanic rock 10 so that the stains can be transmitted. No. The container 11 is provided with an inlet 12 and an outlet 13 for mechanical water.
[0013]
The shapes and positions of the inflow port 12 and the outflow port 13 are not limited to those shown in FIG. For example, one or both of the inlet 12 and the outlet 13 may be provided on the side surface of the container 11. When mechanical water is circulated by a pump, the inflow port 12 may be provided on the lower side of the vessel 11 and the outflow port 13 may be provided on the upper side, contrary to FIG.
[0014]
When the mechanical water contacts the porous volcanic rock 10, the dirt enters the pores of the porous volcanic rock 10 and is adsorbed on the surface. Since the porous volcanic rock 10 has an extremely large number of holes, its surface area is enormous, and the dirt of the mechanical water is almost completely removed before the mechanical water reaches the outlet 13.
[0015]
When the porous volcanic rock 10 is contaminated, by flowing clean water through the container 11, the contaminants can be separated from the surface of the hole and can be reused as a filter.
As another method, the dirt can be removed by removing the porous volcanic rock 10 from the container 11 (and the cage 14) and heating it to a temperature at which the dirt adsorbed on the surface of the hole evaporates.
The porous volcanic rock from which dirt has been removed by these methods can be put into the container 11 (and the basket 14) and reused as a filter.
[0016]
【The invention's effect】
In the filtration device for mechanical water according to the present invention, by using porous volcanic rock as a filter, the frequency of filter replacement can be significantly reduced compared to the related art, and the replacement cycle can be lengthened. In addition, since the adsorbed dirt can be removed by washing or heating the once used porous volcanic rock, it can be reused as a filter. Moreover, such removal of dirt can be repeated any number of times. Further, since the filtration efficiency of the emulsion and the like is high, the deterioration of the machine water itself is small, and the replacement frequency of the machine water can be significantly reduced.
[0017]
【Example】
As an embodiment of the present invention, a fountain solution circulating cooling device for a printing press will be described with reference to FIG. The porous volcanic rock 10 was housed in a cylindrical metal basket 24 having a diameter of 20 cm for a height of about 1 m. In the present example, the porous volcanic rock 10 floating on water was sized and used so that the particle size became 5 cm to 15 cm. A car 24 is stored in an upright container 21, and an inlet 22 for a used dampening solution is provided at an upper portion of the container 21, and an outlet 23 of a filtered dampening solution is provided at a lower portion of the container 21. The size of the container 21 and the basket 24 and the amount of the porous volcanic rock 10 are determined according to the required filtration amount per unit time of the dampening solution, that is, the amount of machine water used in the printing press (described later).
The pressure gauge 28 is provided for measuring the pressure of air flowing into the liquid, and the valve 29 is provided for discharging the air.
[0018]
The dampening water cooling device 32 and the dampening water inlet 312 of the printing machine 31 are connected by a liquid feed pipe 33. In addition, a connection between the dampening water outlet 311 of the printing press 31 and the inlet 22 of the filtration device, and a connection between the outlet 23 of the filtration device and the dampening water cooling device 32 are provided by a liquid sending pipe 331 for filtration. A pump 34 is provided in the middle of a liquid feed pipe 33 between the dampening water cooling device 32 and the printing press 31.
[0019]
The dampening solution 35 cooled to a predetermined temperature by the cooling device 32 is pressurized by a pump 34 and introduced into a dampening solution inlet 312 of the printing machine 31 through a liquid feed pipe 33. The amount of dampening water used in the printing press 31 is 20 to 50 liters per minute.
The fountain solution mixed with stains such as ink and paper powder emulsified in the printing press 31 is discharged from the fountain solution outlet 311 and flows into the inlet 22 of the filtration device through the liquid feed pipe 331 for filtration. While the dampening solution passes through the inside of the container 21, dirt such as emulsified ink and paper powder is adsorbed to the pores of the porous volcanic rock 10 and removed. The fountain solution from which the dirt has been removed is returned to the water tank 36 of the fountain solution cooling device 32 from the outlet 23 of the filter device through the liquid feed pipe 331 for filtration. By repeating the above operation, the dampening solution is circulated and reused.
[0020]
A running test was performed in which the dampening solution circulating cooling device for a printing press of this embodiment was continuously operated without changing the dampening solution. In the meantime, in this example, replacement and cleaning of the porous volcanic rock were not performed. As a result of this running test, no turbidity of the dampening solution due to the emulsified ink or paper was observed even after 2 years and 6 months.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration example of a filtration device for mechanical water according to the present invention.
FIG. 2 is a schematic view of a fountain solution circulating cooling device for a printing press according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Porous volcanic rock 11, 21 ... Container 12, 22 ... Inlet 13, 23 ... Outlet 14, 24 ... Cage 28 ... Pressure gauge 29 ... Valve 31 ... Printing machine 311 ... Damp water outlet 312 ... Damp water inlet 32 ... dampening water cooling device 33 ... liquid sending pipe 331 ... filtration liquid sending pipe 34 ... pump 35 ... dampening water 36 ... water tank

Claims (3)

a) a plurality of porous volcanic rocks;
b) a container for storing the volcanic rock;
c) a liquid inlet and a liquid outlet provided in the container;
A filtration device for mechanical water, comprising: 2. The filtration device for mechanical water according to claim 1, wherein the volcanic rock is one or a mixture of two or more selected from basalt, andesite, rhyolite, and dacite. 3. 3. The filtration device for mechanical water according to claim 1, wherein the filtration device is used in a circulating reuse device of a dampening solution for a printing press.

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