JPH07114897B2 - Waste liquid treatment device for washing out photosensitive resin plates - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating a waste liquid for washing out a photosensitive resin plate.

Photosensitive resin plates have become remarkably popular recently because they are less expensive than conventional printing plates, are easy to handle during printing, and have excellent printing characteristics. Production (plate making) of a plate from a photosensitive resin original plate is usually performed by the following procedure. That is, the photosensitive resin surface of the photosensitive resin original plate (hereinafter referred to as the photosensitive layer)
Then, a negative or positive film is adhered and then exposed with an actinic ray, and then the unexposed portion is blown off using, for example, compressed air, or the solvent is sprayed at a constant pressure to be sprayed, or the fiber is brushed. The plate is made by a method such as washing out by brushing (rubbing off) with. All of these operations are mechanically performed by a washing machine.

[0003]

2. Description of the Related Art Recently, a photosensitive resin printing plate which can be plate-formed with water (tap water, etc.) especially during washing out is not limited to the field of ordinary letterpress printing (letterpress printing), but also in the field of flexographic printing. It has become popular due to its advantages. However, the wash-out waste liquid generated during plate making is a high concentration of BOD (biochemical oxygen demand), SS.
Since it contains (floating substance) or n-hexane extract, etc., if it is directly discharged into a river, it may cause water pollution regardless of whether it is subject to legal regulations.
There is a big problem in discharging untreated waste liquid as it is. Therefore, a method for separating and removing the resin component in the waste liquid has been investigated, and for example, Japanese Patent Publication No. 59-16512 and Japanese Patent Publication No. 57-11.
Methods such as 3887 have been proposed. However, there is no device for efficiently carrying out these methods, and in reality, these methods are not fully utilized.

[0004]

SUMMARY OF THE INVENTION The present invention was devised in view of the above-mentioned drawbacks of the prior art. The object of the present invention is to simply remove the resin component from the wash-out waste liquid of the water-washable photosensitive resin plate. The purpose of the present invention is to provide a device for efficient separation.

[0005]

According to the present invention, a container main body having a waste liquid hole at the bottom and two waste liquid circulation holes at arbitrary positions on a side wall, and the waste liquid inside the container main body are provided. A basket located above the hole, having a water passage hole in at least a part of the wall surface and having a filter medium loaded therein, one end of which is connected to one of the waste liquid circulation holes, and the other end of which follows. A waste liquid circulation system including a pipe connected to the other of the waste liquid circulation holes and a pump interposed at a predetermined position on the intermediate side of the pipe, one end of which is connected to the waste liquid hole, and a predetermined intermediate side following the waste liquid hole. This is achieved by a washing liquid waste water treatment device for a water washable photosensitive resin plate, which is provided with a waste liquid suction / discharge system having a pump at a position.

The wash-out waste liquid which is the object of the apparatus of the present invention is generated when an unexposed portion is washed out with water after exposing an original plate made of a photosensitive resin composition through an original film (negative or positive film). The water used as the washout liquid here is usually fresh water such as tap water, but water added with a surfactant or the like for the purpose of improving workability such as improving dispersibility of the washed resin. Even when used, this device can be applied.

The device according to the invention has a basic structure as illustrated in the schematic diagram in FIG.

In FIG. 1, reference numeral 1 denotes a cylindrical container main body for containing wash-out waste liquid and for treating it so that the photosensitive resin component in the wash-out waste liquid can be easily separated by filtration. That is, the wash-out waste liquid of the water washable photosensitive resin plate is guided to the container body 1 and is subjected to a pretreatment in the container body 1 for facilitating the filtration separation of the resin component in the wash-out waste liquid. As a pretreatment for efficiently filtering and separating the resin component from the wash-out waste liquid, a method of increasing the temperature of the wash-out waste liquid, a method of adding a coagulant for aggregating the resin component to the wash-out waste liquid, or a method of these There is a method of performing the methods at the same time, and these methods are usually performed while washing out the waste liquid while stirring. 2 is a waste liquid hole provided at the center of the bottom of the container body 1, 3 and 4 are waste liquid circulation holes provided at upper and lower sides of the side wall of the container body 1 at appropriate intervals, and 5 is one end of the waste liquid. Connected to the circulation hole 3,
The other end following this is a pipe connected to the pump 6, and the reference numeral 7 is a pipe connected to the waste liquid circulation hole 4 at one end, and the pipe connected to the pump 6 at the other end. A waste liquid circulation system is constituted by the pump 6 interposed in the middle, whereby the wash-out waste liquid in the container body can be effectively stirred. The arrow indicates the flow of the waste liquid, but it is of course possible to circulate it in the opposite direction. That is, by washing the waste liquid in the container body 1 through the waste liquid circulation hole 3 (or 4) with the pump 6, and washing the waste liquid in the container body 1 through the waste liquid circulation hole 4 (or 3) and discharging the waste liquid again, The wash-out waste liquid in the container body 1 is agitated.

Reference numeral 8 is a basket used for filtering and separating the resin component in the wash-out waste liquid, which is the container body 1.
A water passage hole (not shown) is provided at the center of the lower side of the inside, and at least a part of the bottom wall and the peripheral wall thereof has a water passage hole (not shown), and a filter medium 9 is loaded inside. Reference numeral 10 denotes a ring-shaped member inserted between the container body 1 and the basket 8 for fixing the basket 8 and connecting it to a close contact structure between the inner wall surface of the basket 8 and the outer wall surface of the container body 1. is there.

Reference numeral 11 denotes a pipe connected to the drain hole 2 at one end, and the other end following the pipe connected to a discharge system (not shown) outside the apparatus. Reference numeral 12 denotes a pump 11 provided in the middle of the pipe 11. is there.

The wash-out waste liquid which has been subjected to the pretreatment as described above and is in a state of being easily separated by filtration is pumped.
2 is sucked from the waste liquid hole 2 through the basket 8 and discharged to the outside of the apparatus while leaving the resin component on the filter medium 9 arranged inside the basket 8.

In FIG. 1, an example in which the basket 8 is arranged at the bottom of the container body 1 has been described, but of course the invention is not limited to this embodiment. For example, as shown in FIG. 2, the container body 13 has a large diameter upper step portion. 14 and the lower part 15 of the small diameter following this,
The basket 8 may be arranged in the small-diameter basket portion 15, which makes it possible to more efficiently filter and separate the resin component. In this case, in order to improve the efficiency of the filtration separation of the resin component, it is desirable that the upper surface of the lower basket 15 and the upper surface of the basket 8 are tightly fixed to each other via the ring-shaped connecting member 16 as shown in the figure.

FIG. 3 shows an example in which the pump 6 used for stirring the wash-out waste liquid is omitted, and the pump 12 for sucking the wash-out waste liquid and filtering and separating the resin component also has the function thereof. . That is, in this example, the waste liquid hole 2 and the waste liquid circulation hole 3 are connected by the pipe 17, and the pipe 18 whose one end is connected to the waste liquid circulation hole 4 is arranged so as to be connected to the discharge system outside the system. Further, three-way cocks 19 and 20 are respectively arranged at predetermined positions on the intermediate side of the pipe 17 and the pipe 18, and the three-way cocks are connected by a pipe 22 having a homp 21 in the middle.

The container body 1 is usually preferably made of stainless steel, and is usually equipped with a heater on the outside of the wall.
The heater is used to raise the temperature of the wash-out waste liquid, but the heater does not necessarily have to be provided outside the container body, and may be provided inside the container body, for example.

Among the pretreatment methods for efficiently filtering and separating the resin component from the washing waste liquid which is preferable for the apparatus of the present invention, the temperature in the method of raising the temperature of the washing waste liquid is 25 ° C. to 90 ° C., preferably 35 ° C. The temperature is from 80 ° C to 80 ° C. As the aggregating agent, a metal salt or a polymer aggregating agent is usually used. As the metal salt, sodium chloride, potassium chloride, sodium bromide, calcium chloride, aluminum sulfate, sodium sulfate and the like are preferably used. As the polymer flocculant, polymethyl methacrylate-based flocculants, copolymer-based flocculants of maleic anhydride and methyl vinyl ether, and the like can be mentioned as typical examples.
It is not limited to these. Further, the effect is further enhanced by increasing the temperature and adding the coagulant at the same time. The basket F used in the device of the present invention has a water passage hole in at least a part of the wall, but usually has a water passage hole in the entire surface of the wall or has a water passage hole only in the bottom portion. Alternatively, a basket F having water passage holes on its side surface may be used. The material of the basket F is preferably stainless steel, but is not limited to these. Further, a wire net or a punching metal is preferably used for the portion of the water passage, but a net made of plastic can also be used. Also, as the filtering material E, rayon,
Nonwoven fabric such as polyester or polypropylene is preferably used, and the mesh size of the filter medium is 5 μm.
-100 μm is usually used, but is not limited thereto.

The basic structure and function of the device in the present invention are as described above, but the device of the present invention is used in order to improve the workability in filtering and separating the resin component from the wash-out waste liquid of the water-washable photosensitive resin plate. Usually, for example, a temperature controller for the washing waste liquid, a timer for automatically controlling the treatment time, a buzzer for notifying the end of the work of each step, and the like are preferably incorporated and used.

The apparatus of the present invention is widely applied to the treatment of waste liquid of water washable photosensitive resin plate such as photosensitive resin relief plate and photosensitive flexo plate. Typical examples of such a photosensitive resin plate are the “Fuji Torelief” W type manufactured by Toray Co., Ltd., which is currently on the market, and Fuji Photo Film Co., Ltd., and the “Printite” which is manufactured and sold by Toyobo Co., Ltd. , ”And the like, but are not limited thereto.

[0018]

EXAMPLES The present invention will be described in more detail below with reference to examples.

Example 1 The apparatus shown in FIG. 3 was prepared and used for treating the wash-out waste liquid of the water wash-out photosensitive resin plate. A container body 1 having a length of 40 cm, a width of 50 cm, and a height of 56 cm having a cylindrical space with a diameter of 30 cm and a height of 16 cm for disposing a basket on the bottom was prepared. The container body has a waste liquid hole 2 having an inner diameter of 1/2 inch at the center of the bottom, and is 15c from the lower end of the right side wall.
m, 2 cm from the back, a hole for waste liquid circulation 3 with an inner diameter of 1/2 inch, 15 cm from the lower end of the right side wall, 38 from the back
A waste liquid circulation hole 4 having an inner diameter of 1/2 inch is provided at a position of cm, and the waste liquid hole 2 is a pipe having an inner diameter of 1/2 inch and a capacity of 70 l.
The pump 21 is connected to a pump 21 of / min so that filtered water is discharged to the outside of the apparatus, and a three-way cock 20 is provided in the pipe for discharging the filtered water to the outside. A three-way cock 19 is provided between the waste liquid hole 2 and the pump 21.

The basket 8 has an outer diameter of 28 cm, a height of 14 cm, and a bottom with a water passage hole having a diameter of 1 cm. The ratio of the bottom hole portion to the hole-free portion is 1: 1. The inside of the basket 8 is loaded with a filter medium 9 made of rayon nonwoven fabric and having a mesh of 20 μ, and the upper annular member 16 of the basket 8 is closely attached to the container body 1 by rubber packing. 2KW on the outer wall of the container body 1
(0.8 W / cm ² ) heater is incorporated,
In addition, a controller and the like are incorporated as appropriate.

Next, except for the cover film of the water wash-out photosensitive resin letterpress "Fuji Torelief" WF95DII manufactured by Toray Industries, Inc. and sold by Fuji Photo Film Co., Ltd., a negative film was adhered to it and an ultraviolet fluorescent lamp was attached. It was irradiated with UV light from a distance of 50 cm for 5 minutes. Next, using a brush washing machine, washing out was performed in water at 25 ° C. for 3 minutes. 60 liters of washing waste liquid generated by this washing work
(Resin concentration 5 wt%) was put into the container body 1. In the direction in which the cock 20 connects the pump 21 and the waste liquid circulation hole 4,
Further, the cock 19 was aligned with the direction in which the pump 21 and the waste liquid circulation hole 3 were connected, the switch of the pump 21 was turned on, and 1 kg of salt was added to the container body 1. Then the heater was switched on. The temperature of the washout liquid is 25 ℃ at the start
However, the temperature reached 40 ° C. after 30 minutes. After reaching 40 ° C., the heater was turned off, the pump was turned off, and the mixture was left for 10 minutes. Next, in the direction of the pipe for discharging the cock 20 to the pump 21 and the outside of the apparatus, the cock 19 is moved to the pump 2
The pump was turned on in accordance with the direction of 1 and the waste hole 2. At the same time as the pump was turned on, the filtration of the resin component from the wash-out waste liquid started, and the filtration was completed in 5 minutes. When the filtration was completed, the pump 21 was turned off. By this operation, 2.3 kg of the resin component containing 3 l of water was separated by filtration (separation rate 77%).

Example 2 Instead of the "Fujitorelief" WF95DII in Example 1, "Printite" E manufactured and sold by Toyobo Co., Ltd.
After performing F95GC plate making, 60 l of the washing waste liquid (the ratio of the resin component was 5 wt%) generated in the washing work was transferred to the container body 1, and 1 kg of a flocculant composed of a copolymer of maleic anhydride and methyl vinyl ether was added. . Next, the cocks 20 and 19 were operated in the same manner as in Example 1 to turn on the heater and pump 21. After 2 hours, the wash-out waste liquid reached 60 ° C from 25 ° C at the start.
After reaching 60 ° C, the heater and pump 21 were switched off. Next, the cocks 20 and 19 were operated in the same manner as in Example 1, the switch of the pump 21 was turned on, and the operation was continued for 5 minutes. As a result, 1.9 kg of a resin component containing 5 liters of water was separated by filtration (separation rate 63%).

[0023]

EFFECTS OF THE INVENTION Since the present invention is constituted as described above, it has a remarkable practical effect that the resin component can be remarkably simply and effectively removed from the washing waste liquid of the water washable photosensitive resin plate. Is.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an example of an apparatus according to the present invention.

FIG. 2 is a schematic cross-sectional view of main parts showing another example of the apparatus according to the present invention.

FIG. 3 is a schematic sectional view showing still another example of the apparatus according to the present invention.

[Explanation of symbols]

 1: Container body 2: Waste liquid hole 3,4: Waste liquid circulation hole 8: Basket 9: Filter material 6,12,21: Pump 19,20: Three-way cock

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area G03F 7/26

Claims (2)

[Claims] 1. A container body having a waste liquid hole at the bottom and two waste liquid circulation holes at arbitrary positions on the side wall, and a container body inside the container body and above the waste liquid hole, A basket having water passage holes in at least a part thereof and a filter medium loaded therein, one end is connected to one of the waste liquid circulation holes, and the other end is connected to the other of the waste liquid circulation holes. Waste liquid circulation system including a pipe and a pump interposed at a predetermined position on the intermediate side of the pipe, one end is connected to the waste liquid hole, and a waste liquid suction and discharge is provided at which a pump is provided at a predetermined intermediate position. A waste liquid treatment device for washing out water-removable photosensitive resin plates, which comprises a system. 2. A washing-out waste liquid treatment apparatus for a water washable photosensitive resin plate according to claim 1, wherein the pump provided in the waste liquid circulation system and the pump provided in the waste liquid suction / discharge system are the same pump.