JP6493797B2 - Cleaning drainage purification method, plate cleaning method and plate cleaning apparatus - Google Patents

Description

  The present invention relates to a cleaning drainage purification method, a plate cleaning method, and a plate cleaning apparatus, and more particularly to a technique suitable for use in cleaning a removed relief printing plate for reverse offset printing in a flexible device.

  Due to the remarkable development of information technology, information is frequently sent and received at notebook computers and portable information terminals. It is a well-known fact that in the near future, a ubiquitous society that can exchange information regardless of location will come. In such a society, a lighter and thinner information terminal is desired.

  Currently, the mainstream of transistors used in the information terminal is silicon (Si), but as a manufacturing method thereof, silicon is formed by a dry method such as sputtering or CVD, and then the photolithography technique is used. A method of patterning a transistor is common.

  In recent years, patterning of the transistor by a printing technique has attracted attention from the viewpoint of cost reduction and flexibility. The use of printing technology reduces equipment and manufacturing costs compared to photolithography, and does not require vacuum or high-temperature processes, thereby reducing energy load. In addition, flexible substrates such as plastics are used. Advantages such as patterning on the material are possible.

  However, the printing method is generally poor in resolution as compared with the photolithography method, and fine patterning is a problem. On the other hand, there is a reverse offset printing method as a printing method corresponding to fine pattern formation (see Patent Document 1).

  In the reverse offset printing method, an ink application surface is formed on a silicon blanket, and the removed relief printing plate with the non-image area (the non-inked portion of the image) convex is pressed against the application surface to adhere to the convex portion. And the ink of a convex part is removed from the base surface on a silicon | silicone blanket, and the ink which remained on the base surface is transcribe | transferred to the to-be-printed body surface, such as a board | substrate.

  In the reverse offset printing method, unnecessary portions are transferred to the removed relief printing plate in the ink removal step. In order to perform continuous printing, the ink adhering to the removal relief plate is washed and removed for each printing. There is a need.

  For example, Patent Document 2 uses a method of removing an ink coating film adhering to a removal relief plate using an adhesive tape.

JP 2000-289320 A Japanese Patent No. 4826109

  However, it is difficult to completely remove the adhered ink coating film by the method described in Patent Document 2, and it is disadvantageous in terms of cost because an expensive adhesive tape is disposable.

  Therefore, a cleaning and removal method using a cleaning liquid is conceivable. However, there is a problem that a large amount of cleaning drainage liquid containing ink components is generated after the cleaning, resulting in an increase in environmental load. Further, since a tank for collecting and storing the washing waste liquid is required, it is a problem that the apparatus is increased in size.

  For this reason, it is conceivable to purify and purify the recovered cleaning waste liquid and recycle it as a cleaning liquid for recycling. However, since the purity of the cleaning liquid greatly affects the cleanliness of the relief relief, the purity of the recovered cleaning liquid In some cases, a part of the ink component remains on the plate or re-adheres to the plate so that the cleanliness of the removed relief plate is greatly reduced, resulting in defects in patterning by printing. It has become.

  In particular, when a fine pattern of a transistor is formed by the reverse offset printing method, if the cleanness of the removed relief printing plate is low, the transistor performance is deteriorated, for example, the electrode thin wire of the transistor is broken or short-circuited due to inappropriate coupling. There is a fear.

  Also, when printing is repeated continuously, if the cleaning liquid is not highly purified by purification and purification, the print pattern defects increase with each printing due to the accumulation of the purity of the cleaning liquid, resulting in a significant reduction in productivity and drainage. The problem is that it leads to an increase in the environmental load accompanying the increase in the amount.

  The present invention has been made in view of the above circumstances, and is excellent in the cleaning performance of the ink adhered on the plate and enables the cleaning liquid to be purified. By reusing this, the amount of waste liquid can be reduced and the environmental load is reduced. An object of the present invention is to achieve the object of providing a cleaning drainage purification method, plate cleaning method, and plate cleaning apparatus that can be reduced.

The first aspect of the present invention is a removing relief printing apparatus for removing unnecessary portions of ink from ink applied on a blanket.
  This cleaning device has a first recess, the first recess faces the removal relief, has a chamber installed so as to cover the removal relief, a second recess, and the second recess has A cover disposed in the first recess so as to face the removed relief, and a tip disposed in the second recess, and an unnecessary portion of ink is removed from the removed relief. As a plate cleaning means, a cleaning nozzle that jets cleaning liquid from the tip to the removed relief surface, and a cleaning means that purifies and regenerates the cleaning waste liquid, a cleaning waste containing ink after cleaning using a cross-flow ultrafiltration device. Solid matter removing means for removing the solid matter from the liquid to purify and regenerate the cleaning waste liquid.

The cleaning apparatus of the present invention has solid matter removing means , so that it is possible to remove solid matter in the cleaning waste liquid of ink that may contain extremely fine metal particles with high environmental impact, and purify and regenerate the cleaning waste liquid. be able to.

  When the ink of the present invention contains a metal, it is possible to cope with cleaning of the removed relief printing for reverse offset printing in the flexible device.

The second aspect of the present invention is a cleaning wastewater purification method used for cleaning a relief relief plate that removes unnecessary portions of ink from ink applied on a blanket, which is performed using the cleaning device of the present invention.
  This purification method has a solid matter removing step of removing and removing the solid matter from the washing waste liquid containing the ink after washing by using the solid matter removing means.
  A third aspect of the present invention is a method of cleaning a relief relief plate that uses the cleaning device of the present invention to remove unnecessary portions of ink from ink applied on a blanket.
  In this cleaning method, a cleaning liquid is ejected onto the surface of the removed relief printing plate by using a washing nozzle to remove the ink on the surface of the removed relief printing plate, and the cleaning waste discharged in the plate washing step by the solid matter removing means. A cleaning liquid purification step for purifying and regenerating the liquid.

  The present invention includes a drying step of drying and solidifying the ink on the removed relief printing plate by blowing before the plate cleaning step, whereby the ink can be suitably removed in the plate cleaning step.

  According to the present invention, it is possible to improve the cleaning performance of the ink adhering to the surface of the removed relief printing plate, to purify and regenerate the cleaning waste liquid, and to reduce the amount of liquid finally discarded, thereby reducing the environmental load. It is possible to provide an effect that it is possible to provide a purification method, a plate cleaning method, and a plate cleaning apparatus.

  Further, by drying and solidifying the ink adhered on the plate with hot air, the ink on the plate can be more easily cleaned and removed, and the load of the waste liquid purification process can be further reduced.

  In addition, since the waste liquid can be efficiently purified within the printing process time, that is, regenerated as a cleaning liquid, a large-scale waste liquid recovery tank for storing waste liquid that is not regenerated is not required, and downsizing of the apparatus can be achieved. .

1 is a schematic diagram showing a plate cleaning apparatus in a first embodiment of a cleaning drainage purification method, a plate cleaning method, and a plate cleaning apparatus according to the present invention. It is a typical sectional side view which shows the plate washing | cleaning means in 1st Embodiment of the plate washing apparatus which concerns on this invention. It is a model plane sectional view showing the plate washing means in the first embodiment of the plate washing device concerning the present invention. It is process drawing which shows the plate cleaning method in 1st Embodiment of the plate cleaning method which concerns on this invention. It is a mimetic diagram explaining filtration in a 1st embodiment of a plate washing method concerning the present invention. It is a mimetic diagram explaining filtration in a 1st embodiment of a plate washing method concerning the present invention.

Hereinafter, a cleaning drainage purification method, a plate cleaning method, and a plate cleaning apparatus according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a plate cleaning apparatus according to this embodiment. In the figure, reference numeral 1 denotes a plate cleaning apparatus.

    As shown in FIG. 1, the plate cleaning apparatus 1 according to the present embodiment is a removal relief plate cleaning apparatus that removes unnecessary portions of ink from ink applied on a blanket used when manufacturing a flexible device. A plate cleaning means 10 that removes unnecessary portions of ink from the relief printing plate and a purification means 20 that purifies and regenerates the cleaning waste liquid are provided.

FIG. 2 is a side sectional view showing the plate cleaning means in the present embodiment, and FIG. 3 is a plan sectional view showing the plate cleaning means in the present embodiment.
The plate cleaning means 10 is used by being installed on a printing machine having a plate stage. As shown in FIGS. 2 and 3, the plate-shaped removal relief plate W is used, and the main surface of the removal relief plate W is a horizontal plane S. And a plate stage 11 that is held in parallel with the first concave portion 16 and a chamber (lid portion) that is disposed so as to face the removed relief plate W and cover the removed relief plate W. 15), a packing (sealing part) 21 provided at the edge of the chamber 15, a cleaning nozzle 25, a suction nozzle 30 and an air knife (air ejection nozzle) 35 disposed in the first recess 16; A moving mechanism 40 for moving the cleaning nozzle 25 relative to the plate stage 10, a cleaning liquid discharge port 50 provided in the chamber 15, and a cover in which a second recess 56 is formed and disposed in the first recess 16. 55 and moving mechanism 4 And a control unit 60 for controlling. In the drawing, for convenience of explanation, the suction nozzle 30 and the air knife 35 are not shown, but the cover 55 is indicated by a two-dot chain line. Here, a horizontal direction X parallel to the horizontal plane S and an orthogonal direction (crossing direction) Y parallel to the horizontal plane S and orthogonal to the horizontal direction X are respectively defined.

The removed relief plate W is made of a metal such as a silicon wafer, quartz glass, non-alkali glass, blue plate glass, SUS (stainless steel), copper, nickel, or a resin. The surface of the removed relief plate W may be plated with a metal such as chrome, or may be formed into a vapor phase film such as silica or diamond-like carbon.
A groove (not shown) of the removed relief W can be formed by molding, electroforming, wet etching / dry etching by photolithography, sand blasting, laser drawing, or the like. Among these removed relief plates W, those obtained by processing glass by wet etching are widely used. This is because the processing is relatively easy and the large area, high resolution, high accuracy, and the uneven shape are sharp. On the other hand, since the glass relief relief W is physically fragile, problems such as chipping and scratches occur when a contact cleaning method using a doctor or brush is used. For such a removal relief W, it is preferable to use a non-contact cleaning method such as spraying. In order to facilitate understanding of the orientation of the plate W, an index W1 is shown on the upper surface for convenience of explanation.

  What is to be removed by the plate cleaning apparatus 1 of the present invention is conductive ink adhering to the removed relief plate W. The ink is not particularly limited as long as it is an ink prepared for reversal printing. For example, metal fine particles such as silver, copper, nickel, and zinc, and metal oxides such as silicon dioxide, barium titanate, and zinc oxide. Examples thereof include inks containing fine organic particles such as fine particles, phthalocyanine, quinacridone, and diketopyrrolopyrrole. Alternatively, an ink containing metal nanoparticles can be used. Metal nanoparticles are nanoparticles made of gold, silver, copper, platinum, palladium, nickel, cobalt, iron, aluminum, manganese metals, or gold, silver, copper, platinum, palladium, nickel, cobalt, iron, aluminum Further, it may be an alloy made of two or more metals selected from metals of manganese, molybdenum. The average particle diameter of the metal used is preferably 50 nm or less from the viewpoint of dispersibility in ink. From the viewpoint of stable production of particles, those having an average particle diameter of metal of 10 nm to 30 nm are generally used.

  In this ink, the surface energy of the particles increases as the diameter of the particles such as metal nanoparticles decreases, and the aggregation of the particles and the adhesion to the plate increase. In addition, in the reverse offset printing method, it is necessary to remove the dried ink from the plate. However, once nano-order particles such as metal nanoparticles are dried, it becomes difficult to re-disperse in a solvent as it is. Therefore, a cleaning effect cannot be obtained only by immersing in a cleaning liquid, and a physical action of peeling or scraping ink from a plate is effective.

  In order to remove ink from the plate, there are known a one-fluid spray (nozzle) that sprays only a cleaning liquid such as water on the plate and a two-fluid spray that sprays a mixed fluid obtained by mixing a gas such as air and a cleaning liquid on the plate. It has been. Compared with the single fluid spray, the two-fluid spray generates a high local pressure due to a high-speed fluid collision, and has a great effect of inducing a high shear flow or vibration of the target to peel off the target. Since the two-fluid spray has a strong water flow, the effect of preventing reattachment is remarkable. In this respect, cleaning with a two-fluid spray is effective for removing metal nanoparticles.

  When forming an electric circuit for electronics use by a printing method, the metal nanoparticles as described above are often used. Compared with single-fluid spray cleaning, where a droplet of several hundred μm is struck against the substrate, and brush cleaning or sponge cleaning, where the substrate is rubbed with a structure of micrometer order, the cleaning method using two-fluid spray is finer than metal nanoparticles Suitable for the removal of small particles.

  The plate stage 11 is formed in a flat plate shape with stainless steel or the like, and is held so that its main surface is parallel to the horizontal plane S. The plate stage 11 is movable in parallel to the horizontal plane S along a track (not shown). Although not shown, the plate stage 11 includes a vacuum suction mechanism and an electrostatic suction mechanism as a suction mechanism for sucking and fixing the removed relief plate W on the upper surface portion. The removed relief plate W is held on the upper surface of the plate stage 11.

  The chamber 15 is made of, for example, stainless steel or the like, and has an outer shape that is a rectangular parallelepiped and has an opening on one surface. A first recess 16 is formed by the opening and the internal space of the chamber 15. The chamber 15 can operate in the vertical direction so that it can be moved close to and away from the plate stage 11, that is, the removed relief plate W held on the plate stage 11. The packing 21 can be appropriately selected from those having a known configuration. The packing 21 is provided on the edge of the opening of the chamber 15 over the entire circumference. The packing 21 seals between the removed relief W or the plate stage 11 and the chamber 15 in a watertight manner. This prevents leakage of water splashes and the like. Note that a backing plate may be installed on the outer periphery of the removed relief plate W, and the packing 21 may be brought into contact with the backing plate.

  From the viewpoint of ink removal efficiency, the cleaning nozzle 25 is preferably one that can spray the cleaning liquid at a high pressure and spray it onto the plate surface, and known and publicly used pressure type nozzles such as a two-fluid nozzle, four-fluid nozzle, and high-pressure jet nozzle are used. It is not limited to. As an example of the cleaning nozzle, there can be mentioned a 2-fluid nozzle manufactured by Ikeuchi Co., Ltd., a high-pressure spray nozzle MEG series manufactured by Spraying System Japan Co., Ltd., and the like.

  Alternatively, the cleaning nozzle 25 is formed in a cylindrical shape and sprays a mixed fluid obtained by mixing air and a cleaning liquid onto the removal relief plate W. The term “cylindrical shape” as used herein includes not only a shape of a circular edge but also a shape of an edge of a polygon such as an ellipse or a rectangle in a plane perpendicular to the axis of the cleaning nozzle 25. It is. In the present embodiment, a plurality of cleaning nozzles 25 are provided in a state where they are arranged at intervals in the orthogonal direction Y. The cleaning nozzle 25 can select the following material from the load pressure, the corrosivity of the cleaning liquid, and the temperature. Metals such as stainless steel, brass, titanium, tungsten alloy, resins such as vinyl chloride, polypropylene, polyethylene, polyamide, fluorine resin, polyphenylene sulfide, urethane, epoxy, ABS resin, ceramics such as alumina, silicon nitride, silicon carbide, etc. Materials such as sapphire, ruby, diamond and graphite can be used.

  The opening provided in the front-end | tip part (end part) 26 of each washing | cleaning nozzle 25 is formed in slit shape. The opening of the cleaning nozzle 25 faces the removal relief W. The discharge cross-sectional shape of the spray sprayed from the cleaning nozzle 25 can be selected from flat, ring, cone, and the like. In order to increase the spray force on the removed relief W, it is better to reduce the discharge cross-sectional area. In order to suppress ink cleaning unevenness, the spray pattern must be arranged in a direction orthogonal to the direction in which the cleaning nozzle 25 moves with respect to the plate stage 11, that is, in the orthogonal direction Y. In this case, if the cleaning nozzle 25 having a small discharge cross-sectional area is used, it is necessary to use a large number of cleaning nozzles 25 side by side. In view of the above, the spray pattern is flat with respect to the horizontal direction X (the length in the horizontal direction X is shorter than the length in the orthogonal direction Y of the spray pattern), and a flat shape or a slit nozzle type is used. Is preferred.

  The cleaning nozzle 25 is a two-fluid spray, and can adjust the pressure of the liquid and the pressure of the gas. In this case, the turndown ratio is large, while the spray amount of the one-fluid spray is Since it is proportional to the square root of the pressure acting on the fluid, the spray amount is limited by power and the turn-down ratio of the spray amount is small. Thus, the cleaning nozzle 25 that is a two-fluid spray can be easily adjusted without changing the power even for trade-off demands such as cleaning performance and liquid saving.

  The air supplied to the cleaning nozzle 25 is pressurized in advance to the atmospheric pressure or higher by the compression device 65, and the cleaning liquid supplied from the cleaning liquid storage tank 77 to the cleaning nozzle 25 is preliminarily increased by the pressurizing device (pump) 69. Pressurized above atmospheric pressure. These pressurized air and cleaning liquid are supplied to the cleaning nozzle 25 through different pipes. As the gas-liquid mixing method for mixing the gas and the cleaning liquid, an internal mixing type, an internal air type or an external air type external mixing type, and a collision type can be selected. The pressure of the cleaning liquid can be selected from 0.2 MPa (Pascal) to 0.5 MPa, and the gas pressure can be selected from 0.3 MPa to 1.0 MPa. The spray angle at which the spray spreads from the cleaning nozzle 25 can be selected from 20 ° to 130 °. If the spray angle is too large, the striking force is reduced, which is not preferable. The spraying distance, which is the distance from the tip of the cleaning nozzle 25 to the removal relief plate W, can be selected from 30 mm to 100 mm. If the spraying distance is too long, the striking force is reduced, which is inconvenient. The pitch in the orthogonal direction Y of the cleaning nozzle 25 is set based on the spray angle and spray distance so that there is no break in the spray pattern.

  As shown in FIG. 2, the opening of the cleaning nozzle 25 is located on one side X1 in the horizontal direction X of the cleaning nozzle 25, and the cleaning nozzle 25 becomes the removal relief plate W toward the one side X1 in the horizontal direction X. It is arranged to approach. The elevation angle α1, which is the angle formed by the central axis of the cleaning nozzle 25 and the horizontal plane S, is preferably 30 ° or greater and 90 ° or less, and more preferably 60 ° or greater and 80 ° or less. If the elevation angle α1 is too small, the striking force becomes small, which is not preferable. It is preferable that the axis of the cleaning nozzle 25 is slightly inclined with respect to the horizontal plane S in order to create a flow after colliding with the removed relief plate W and drain quickly. The cleaning nozzle 25 may be arranged with a tilt angle. As the collision spray pattern, which is the shape when the mixed fluid sprayed by each cleaning nozzle 25 collides with the removal relief plate W when the tilt angle is given to the cleaning nozzle 25, the cleaning nozzle 25 adjacent in the orthogonal direction Y Collision spray patterns are connected without being separated from each other. In this manner, by providing the cleaning nozzle 25 with a tilt angle, it is possible to eliminate the gap between the collision spray patterns P and suppress the cleaning unevenness.

  The cleaning liquid sprayed onto the surface of the relief relief W using the cleaning nozzle 25 is not particularly limited as long as it is a liquid that can remove ink, but is preferably a liquid with a low environmental load, and includes, for example, water and a neutral detergent. Examples thereof include water and water containing a water-soluble organic solvent such as ethanol and acetone. Further, the temperature of the cleaning liquid to be sprayed is not particularly limited. However, when the cleaning liquid is mainly composed of water, the temperature is preferably in the range of 5 ° C to 90 ° C, more preferably in the range of 25 ° C to 80 ° C.

The blower drying means 61 is a mechanism that blows air in order to dry and solidify the ink on the removed relief plate W before the ink is removed by spraying the cleaning liquid by the cleaning nozzle 25, and in particular, it is a hot air mechanism. The nozzle 62 and the air blowing mechanism 63 can be provided.
The blower drying means 61 is not particularly limited as long as it is a mechanism that blows hot air onto the surface of the removed relief W, but can include a spray nozzle method, a burner type, a fan type, and the like. Various publicly known and publicly equipped devices can be used.

  There is no particular limitation on the gas used for blowing hot air by the air blowing and drying means 61, but in particular, when the ink remaining on the removed relief printing plate W includes a combustible material, it is preferable to use an inert gas such as nitrogen or argon gas. . The temperature of the hot air may be appropriately set according to the ink component to be dried, and is not particularly limited, but preferably ranges from 40 ° C to 200 ° C, more preferably from 60 ° C to 150 ° C. If the hot air temperature is 40 ° C. or higher, drying of the ink component can be promoted sufficiently, and if it is 200 ° C. or lower, deformation of the removed relief W by heat can be suppressed.

  The blowing speed of the hot air is not particularly limited, and can be appropriately set according to the size of the relief relief W and the printing time. However, the range of 1 L to 100 L per minute is preferable from the viewpoint of drying efficiency.

  The suction nozzle 30 and the air knife 35 are also formed in a cylindrical shape extending in a predetermined direction. The suction nozzle 30 and the air knife 35 can be formed of the same material as that of the cleaning nozzle 25. An opening 32 provided at the distal end portion (end portion) 31 of the suction nozzle 30 and an opening 37 provided at the distal end portion 36 of the air knife 35 respectively face the removal relief plate W. The suction nozzle 30 is disposed substantially along the vertical direction. The suction nozzle 30 is connected to a suction device such as a blower (not shown). A mist separator for separating gas and liquid is provided between the suction nozzle 30 and the suction device.

  The suction nozzle 30 sucks the aforementioned mixed fluid or the like from the opening 32. The air knife 35 is disposed on the side opposite to the suction nozzle 30 with respect to the cleaning nozzle 25. The air knife 35 ejects air from the opening 37. The air knife 35 may be arranged so that the axis of the air knife 35 is slightly inclined with respect to the horizontal plane S so that the blowing direction of the air when the air knife 35 is ejecting air is aligned. In this example, the air knife 35 is disposed so as to be substantially parallel to the nozzle 25, and is inclined with respect to the removed relief plate W. The removed relief letter W after washing can be dried while draining with the air knife 35. The mixed fluid or the like sucked by the suction nozzle 30 is sent to the cleaning liquid discharge port 50 and discharged.

  The cleaning liquid discharge port 50 passes through the chamber 15 and communicates with the first recess 16 and the outside of the chamber 15, respectively. The cleaning liquid discharge port 50 can be installed at an arbitrary location in the chamber 15, but is preferably provided in the lower part of the side wall of the chamber 15 on the downstream side (one side X <b> 1 in the horizontal direction X) of the mixed fluid ejected from the cleaning nozzle 25. When the plate stage 11 is moved to both sides in the horizontal direction X with respect to the cleaning nozzle 25, the cleaning liquid discharge ports 50 may be provided on both sides or one side of the chamber 15 in the horizontal direction X. It is important not to stay on W. When the mixed fluid is strongly sprayed, the cleaning liquid itself is discharged to the outside of the removal relief plate W with the force. However, there is a case where the cleaning liquid whose momentum has once weakened hits the side wall of the chamber 15 and returns onto the removal relief plate W again. By providing the cleaning liquid discharge port 50, the cleaning liquid can be effectively discharged using the momentum at which the mixed fluid is ejected. It is more preferable that the cleaning liquid discharged to the outside of the removal relief W is provided with a mechanism for preventing a backflow that returns to the removal relief W again.

  When the cleaning liquid sprayed from the cleaning nozzle 25 stays on the removal relief plate W for a long time, there arises a problem that the ink contained in the cleaning liquid is reattached to the removal relief plate W. When ink stains are reattached to the removal relief W, it is often more difficult to remove than the original ink. Therefore, the sprayed cleaning liquid must be removed from the removal relief W as quickly as possible. By using the suction nozzle 30 and the cleaning liquid discharge port 50 for removing the cleaning liquid on the removal relief W, it is possible to quickly discharge the cleaning liquid from above the removal relief W and prevent the ink from reattaching to the removal relief W. . In the present embodiment, it is preferable to provide the exhaust port 52 on the top surface of the chamber 15. The exhaust port 52 passes through the chamber 15 and communicates with the first recess 16 and the outside of the chamber 15. With this configuration, the cleaning liquid scattered in the chamber 15 is removed to the outside of the chamber 15 through the exhaust port 52, and droplets of the cleaning liquid adhere to the nozzles 25, 30, 35 and the inner surface of the chamber 15. Can be suppressed. Therefore, it is possible to prevent the removed relief W from being contaminated again by the cleaning liquid.

  The cover 55 is made of the same material as that of the chamber 15 and is formed in a shape in which the outer shape is a rectangular parallelepiped and the lower surface is open. The cover 55 is disposed so that the second recess 56 faces the removal relief W, that is, opens downward. The cleaning nozzle 25 and the suction nozzle 30 are inserted through the cover 55. In the second recess 56, the distal end portion 26 of the cleaning nozzle 25 and the distal end portion 31 of the suction nozzle 30 are disposed.

  As shown in FIG. 3, the moving mechanism 40 has a connecting member 45 that integrally connects the nozzles 25, 30, and 35 to the plate stage 11, and has axes that are parallel to the horizontal direction X, the orthogonal direction Y, and the vertical direction. A horizontal actuator 41, an orthogonal actuator 42, and a rotation actuator 43 that move in the surrounding rotation direction θ are provided. As each of the actuators 41, 42, and 43, a known configuration combining a motor, a cam, a gear, and the like can be used. The amount of movement of the nozzles 25, 30, 35 by the actuators 41, 42, 43 is detected by a sensor (not shown). The detection result of the sensor is transmitted to the control unit 60. The moving mechanism 40 is usually attached to the chamber 15, but the attachment position is not particularly limited.

  The purifying means 20 purifies and regenerates the cleaning effluent. As shown in FIG. 1, the cleaning discharge liquid collecting tank 71, the solid matter removing means 72, the organic matter removing means 73, and the ion removing means 74, And a microfiltration means 75, a regenerated cleaning liquid storage tank 76, a cleaning liquid storage tank 77, and a cleaning liquid regeneration detection means 78.

  The cleaning liquid recovery tank 71 stores the cleaning liquid discharged from the cleaning liquid discharge port 50, and is connected to the solid matter removing means 72 via the liquid circulation pump P.

The solid matter removing means 72 is to purify and regenerate the cleaning waste liquid by removing the solid matter from the cleaning waste liquid containing the ink after the cleaning using a cross flow type ultrafiltration device. The solid material derived from the ink component is not permeated to the cleaning liquid storage tank 77 side, but is separated into the permeated liquid 72a to the organic matter removing means 73 and the concentrated liquid 72b containing fine particles (solid matter). The concentrated liquid 20 is sent to the washing discharge liquid recovery tank 71.
In addition, a filtering unit 72c may be further provided on the upstream side of the solid matter removing unit 72.

  The ultrafiltration device that can be used in the solid matter removing means 72 in the present embodiment is not particularly limited as long as it is a crossflow ultrafiltration device, but a hollow fiber-like ultrafiltration membrane of polyethersulfone or cellulose acetate is used. A hollow fiber module bundled in large numbers and a spiral module in which flat membranes of ultrafiltration membranes are arranged in a roll shape can be mentioned.

In general, in the cross-flow filtration, as shown in FIG. 6, when the treatment liquid F0 pressurized against the surface of the filtration membrane F is permeated as shown by the arrow F8, the filtration is performed as shown by the arrow F2. The treatment liquid F0 pressurized against the surface of the membrane F is circulated in parallel.
On the other hand, in the total filtration type, as shown in FIG. 5, when the permeated treatment liquid F0 is allowed to pass through the surface of the filtration membrane F as indicated by the arrow F8, the filtration is performed as indicated by the arrow F1. It is made to circulate perpendicularly to the surface of the film F. Compared to the total filtration method, the cross-flow filtration can suppress the accumulation of the solid matter F3 on the surface of the filtration membrane F, so that stable filtration and purification are possible.

  As an example of the cross flow type ultrafiltration device that can be used in the solid matter removing means 72 in the present embodiment, the MOLSEP series manufactured by Daisen Membrane Systems Co., Ltd., the character series manufactured by Kuraray Aqua Co., Ltd., or the desal series manufactured by Muromachi Chemical Co., Ltd. And so on.

  In the solid matter removing means 72, the pore size of the ultrafiltration membrane used in the crossflow type ultrafiltration device is not particularly limited, but may be selected according to the particle size of the solid matter contained in the ink. When removing the nanosilver fine particles from the waste liquid containing nanosilver-containing conductive ink having a diameter of 20 nm, an ultrafiltration apparatus comprising an ultrafiltration membrane having a pore diameter of at least 20 nm or less, preferably 10 nm or less may be selected. When the molecular weight is 30000, the pore diameter can be about 3-5 nm.

  In the solid matter removing means 72, the cleaning waste liquid containing the ink component is processed by the cross-flow type ultrafiltration device, so that the concentrated solution 72 b containing the solid matter derived from the ink component and the ultrafiltration membrane of the ultrafiltration device are obtained. Can be separated into a permeated liquid 72a that does not contain a solid material that has permeated through. The concentrated liquid 72b containing the solid is circulated to the washing discharge liquid recovery tank 71, so that the concentrated liquid 72b is continuously filtered and purified by the ultrafiltration device. Therefore, the solid in the concentrated liquid 72b is concentrated, The amount of liquid finally discarded can be greatly reduced. Further, by concentrating waste liquid containing ink containing valuable components such as silver ink with an ultrafiltration device, separation and recovery of valuable components in the waste liquid can be made extremely easy.

The organic matter removing means 73 purifies and regenerates the cleaning waste liquid by removing the organic matter in the cleaning waste liquid from the permeated liquid 72a from the solid matter removing means 72 using activated carbon.
The permeate 72a, which has been treated with the cross-flow ultrafiltration device of the solid matter removing means 72 and removed the solid matter, is further dissolved in the permeate 72a by treating with the activated carbon filling device as the organic matter removing means 73. Alternatively, it is possible to adsorb and remove ink-derived components in the dispersed cleaning waste liquid. As an example of the ink-derived component that can be removed by the activated carbon filling apparatus, organic compounds such as nonionic surfactants and polymers can be cited.

The ion removing means 74 purifies and regenerates the cleaning wastewater by removing ions in the cleaning wastewater using an ion exchange resin.
The permeate, which has been treated with the solid matter removing means 72 and the organic matter removing means 73 to remove the solid matter and adsorbed and removed the ink-derived components, is further treated with the ion exchange resin filling device of the ion removing means 74, thereby It is possible to remove ionic substances and salts in the waste liquid that is dissolved in the solution. Examples of these ink-derived components include chloride ions, nitrate ions, sulfate ions, their anions, calcium ions, magnesium ions, and various cations derived from the ink components.

  The microfiltration means 75 only needs to be able to remove the solid matter when the ion exchange resin piece (resin solid matter) from the previous ion exchange resin flows out, and the material of the microfiltration membrane is not particularly limited. Examples thereof include various filtration membranes made of polypropylene, polysulfone, cellulose acetate, polyvinylidene fluoride, polytetrafluoroethylene, and polyethersulfone. Regarding the pore size of the filtration membrane, filtration membranes having various pore sizes in the range of 0.1 μm to several tens of μm, which are generally used as microfiltration membranes, can be used. The microfiltration means 75 can be omitted.

  The regenerated cleaning liquid storage tank 76 temporarily stores the permeated liquid from which the ink-derived components in the cleaning waste liquid have been removed using the microfiltration means 75. Note that the processing liquid discharged from the microfiltration means 75 may directly flow into the cleaning liquid storage tank 77 without providing the regenerated cleaning liquid storage tank 76.

The cleaning liquid regeneration detection means 78 is provided at a downstream position of the regeneration cleaning liquid reservoir 76 and detects whether or not the ink-derived component is sufficiently removed from the liquid discharged from the regeneration cleaning liquid reservoir 76. When the cleaning liquid regeneration detecting unit 78 detects that the ink-derived component has not been sufficiently removed, the valve is closed so that the liquid discharged from the regenerated cleaning liquid storage tank 76 does not flow into the cleaning liquid storage tank 77. A control signal is output to
The cleaning liquid regeneration detection means 78 may be a means for detecting and evaluating the coloration derived from the solid matter of the ink and a means for detecting and evaluating the concentration of the ionic component of the ink with a conductivity meter.

  The regenerated cleaning liquid storage tank 76 is connected to a pipe line from the cleaning discharge liquid collecting tank 71 to the solid matter removing means 72 through a valve, and purifies the regenerated cleaning liquid stored in the regenerated cleaning liquid storage tank 76. In this case, the regenerated cleaning liquid can be sent to the solid matter removing means 72.

The cleaning liquid storage tank 77 can supply the cleaning liquid to the cleaning nozzle 25 through the pump 69 at a high pressure.
The cleaning liquid storage tank 77 is connected to a conduit from the cleaning discharge liquid recovery tank 71 to the solid matter removing means 72 via a valve, and purifies the cleaning liquid stored in the cleaning liquid storage tank 77. Can send the cleaning liquid to the solid matter removing means 72.

  The removed relief printing plate W is washed in the plate washing means 10, and the cleaning waste liquid containing the ink-derived component is purified and regenerated by being treated by the purification means 20, sent to the washing liquid storage tank 77, and reused as the washing liquid. Can do.

  The process in the solid matter removing means 72 can be easily and quickly separated into the permeated liquid 72a and the concentrated liquid 72b with a cross-flow ultrafiltration device, and the cleaning waste liquid purification process can be completed within the printing process time. it can. Further, by treating the permeated liquid 72a with the activated carbon filling device 73 and the ion exchange resin filling device 74, the cleaning liquid can be further purified and the number of continuous printings can be increased.

Next, plate cleaning of the plate cleaning apparatus 1 configured as described above will be described.
FIG. 4 is a process diagram showing the reverse offset printing method.

  In the reverse offset printing method, ink is applied to a blanket B1 having a peelable surface to form an ink coating film B2, and then at least a part of the solvent constituting the ink is evaporated to form an ink coating film on the surface of the blanket B1. After forming B2a (ink coating film forming step), the blanket B1b on which the ink coating film B2a is formed is brought into intimate contact with the relief relief W to remove the portion B2c unnecessary for the pattern (removing step), and then the blanket B1c is covered. A printed material B1d having a target pattern is obtained by transferring the ink coating film B2b to the printing substrate B5 while being in close contact with the printing substrate B5 (transfer process).

  By the removal step, a removed relief plate W to which ink is attached is generated.

In order to continuously produce printed matter, it is necessary to remove all of the ink B2c adhering to the convex portion on the removal relief plate W until the next printing. Here, if ink remains on the removed relief plate W, appropriate removal and transfer cannot be performed in the next and subsequent printing, and there is a risk that a pattern defect will occur in the printed matter.
In this embodiment, as shown in FIGS. 1 to 3, the ink attached to the convex portion of the removed relief plate W is removed by spraying the cleaning liquid onto the removed relief plate W to which the ink has adhered using the washing nozzle 25. This process is referred to as a plate cleaning process.

  Hereinafter, although the movement of the cleaning nozzle 25 with respect to the plate stage 10 will be described, the suction nozzle 30, the air knife 35, and the connecting member 45 also move together with the cleaning nozzle 25.

  The plate cleaning apparatus 1 of this embodiment is used for cleaning the removed relief plate W having ink transferred to the projections. In the plate cleaning means 10, the plate stage 11 on which the removed relief plate W after use is fixed is moved to a predetermined cleaning position. The chamber 15 is lowered with respect to the plate W held on the plate stage 11, and the space between the plate stage 11 or the removed relief plate W and the packing 21 is sealed (sealed). By using the chamber 15 and the packing 21, leakage and splashing of the cleaning liquid can be prevented, and product defects and apparatus failures can be prevented.

  Here, before spraying the cleaning liquid from the cleaning nozzle 25 as necessary, the ink on the removed relief printing plate W is dried and solidified using the hot air mechanism of the blower drying means 61.

  While spraying the mixed fluid in which air and water are mixed from the cleaning nozzle 25, the control unit 60 drives the horizontal actuator 41 of the moving mechanism 40 to the plate stage 11 as indicated by an arrow A1. The cleaning nozzle 25 is moved relatively to the one side X1 in the horizontal direction X.

At this time, the control unit 60 moves so that the position at which the cleaning nozzle 25 sprays the mixed fluid onto the removal relief plate W moves from the other side X2 of the removal relief plate W in the horizontal direction X to the one side X1 in the horizontal direction X. The cleaning nozzle 25 is moved with respect to the plate stage 11 by the mechanism 40. That is, the cleaning nozzle 25 is inclined so that the tip portion 26 of the cleaning nozzle 25 faces the one side X1 in the horizontal direction X, which is the direction in which the cleaning nozzle 25 moves with respect to the removed relief plate W. By comprising in this way, it is prevented that a washing | cleaning liquid flows into the already wash | cleaned part in the relief letterpress W by the mixed fluid sprayed from the washing nozzle 25. FIG.
In the second recess 56 of the cover 55, the distal end portion 26 of the cleaning nozzle 25 and the distal end portion 31 of the suction nozzle 30 are disposed. Therefore, the mixed fluid sprayed from the opening 27 of the cleaning nozzle 25 hits the inner surface of the second recess 56 and is unlikely to go upward. In this way, the removed relief printing plate W is washed over the entire length in the horizontal direction X.

  The controller 60 drives the orthogonal actuator 42 to shift the position of the cleaning nozzle 25 in the orthogonal direction Y with respect to the plate stage 11 by half the pitch of the cleaning nozzle 25 adjacent in the orthogonal direction Y. The horizontal actuator 41 is driven to move the cleaning nozzle 25 to the other side X2 in the horizontal direction X with respect to the plate stage 11. In this manner, the removed relief printing plate W is washed over the entire length in the horizontal direction X, and unnecessary ink that causes a reduction in product quality is removed. After the cleaning liquid remaining on the removed relief plate W is removed by the suction nozzle 30, the liquid is drained and dried by the air knife 35. The chamber 15 is raised with respect to the removed relief W, and the chamber 15 is detached from the removed relief W to complete the cleaning. The suction operation by the suction nozzle 30 may be performed after the completion of the spraying by the cleaning nozzle 25 as in this example, but may be performed while the mixed fluid is sprayed by the cleaning nozzle 25. It is preferable at the point which suppresses scattering.

  According to the plate cleaning means 10 of the present embodiment, the distal end portion 26 of the cleaning nozzle 25 and the distal end portion 31 of the suction nozzle 30 are disposed in the second recess 56 of the cover 55. Therefore, when the ink is removed from the removed relief plate W, the mixed fluid sprayed from the cleaning nozzle 25 strikes the inner surface of the second recess 56, so that scattering of the cleaning liquid can be suppressed. It is possible to prevent the cleaning liquid droplets from adhering to the inner surfaces of the nozzles 25, 30, 35 and the chamber 15. The ink can be peeled from the surface of the removed relief W by a physical action of strongly spraying the mixed fluid containing the cleaning liquid on the removed relief W. Further, since the removed relief plate W to be cleaned is sealed in the chamber 15, the cleaning liquid is scattered when a powerful two-fluid spray is used, and contamination of products and manufacturing equipment can be prevented.

  In the plate cleaning means 10 of the present embodiment, since the plate is cleaned on the printing press, it is cleaned immediately after printing as compared with the conventional machine-side cleaning in which the plate is removed and cleaned. Because the plate is used, there is no plate pattern variation, the dimensional accuracy of the printed line / space is good, and the same plate is used every time, so there is no plate thickness variation, and there is no fluctuation in printing pressure after printing. Since (long dimensional accuracy) is good and printing can be performed with a single plate, the plate making cost is low, and the plate is not removed from the plate stage, so that the printing accuracy (long dimensional accuracy) is good.

  In the plate cleaning means 10 of the present embodiment, the cleaning discharge liquid discharged from the cleaning liquid discharge port 50 is collected in the cleaning discharge liquid recovery tank 71 and sent to the purification means 20 by the drainage circulation pump P.

  In the purification means 20, the cross-flow type ultrafiltration device installed in the solid matter removing means 72 does not permeate the solid matter derived from the ink component in the washing waste liquid to the organic matter removing means 73 side, and the regenerated washing liquid storage tank 76. The permeated liquid 72a to the side and the concentrated liquid 72b containing fine particles are separated. The concentrated liquid 72 b is sent to the cleaning / draining liquid recovery tank 71.

  By treating the waste liquid containing the ink component with the cross-flow type ultrafiltration device of the solid matter removing means 72, the concentrated solution 72b containing the solid matter derived from the ink component and the ultrafiltration membrane of the ultrafiltration device were permeated. It can be separated into a permeate 72a that does not contain solid matter. Since the concentrated liquid 72b containing the solid is circulated between the washing discharge liquid collecting tank 71 and the solid removing means 72, the concentrated liquid and the washing waste liquid are continuously filtered and purified by the ultrafiltration device. The solids in the concentrated liquid and the washing waste liquid can be concentrated to greatly reduce the final waste liquid amount. Moreover, the waste liquid containing the ink containing valuable components such as silver ink can be concentrated to facilitate the separation and recovery of the valuable components.

  The permeated liquid 72a, which has been treated by the solid matter removing means 72 to remove the solid matter, is processed by the activated carbon filling device in the organic matter removing means 73, so that it is dissolved or dispersed in the permeated liquid. Is removed by adsorption.

  The treatment liquid treated with the organic matter removing means 73 to remove the ink-derived components by adsorption is further treated with the ion exchange resin filling device of the ion removing means 74, so that the ionicity in the waste liquid dissolved in the permeate is obtained. Remove substances and salts.

  The processing liquid processed by the ion removing means 74 is stored in the regenerated cleaning liquid storage tank 76 via the microfiltration means 75. The processing liquid stored in the regenerative cleaning liquid storage tank 76 is detected by the cleaning liquid regeneration detecting means 78 and the purification process state is detected, sent to the cleaning liquid storage tank 77, supplied to the plate cleaning means 10, and reused. When the processing liquid (regenerated cleaning liquid) supplied from the regenerated cleaning liquid storage tank 76 does not satisfy a predetermined standard by the cleaning liquid regeneration detecting means 78, the regenerated cleaning liquid is sent to the solid matter removing means 72 via the valve. It has become.

 In the purifying means 20 of the present embodiment, it is possible to suitably remove the ink in the next plate cleaning process by the air blowing and drying means 61, and unnecessary portions of ink from the removed relief plate W by the plate cleaning means 10. In addition, the solid matter is removed from the washing waste liquid containing the ink after washing using the cross flow ultrafiltration device of the solid matter removing means 72, and then the activated carbon of the organic matter removing means 73 is used to wash the waste liquid. After removing the organic matter, the ions in the washing waste liquid are removed using the ion exchange resin of the ion removing means 74, so that the ions can be removed after the solid matter and the organic matter are removed. By purifying and regenerating the ink, unnecessary parts of the ink can be efficiently removed from the removed relief plate W, and the discharged cleaning liquid can be purified and reused. It can be finally to reduce the amount of liquid waste it is possible to reduce the environmental impact.

  Examples The present invention will be described more specifically with reference to the following examples. However, the scope of the present invention is not limited to the following examples.

<Example 1>
(Preparation for printing)
The blanket used was a 330 mm × 470 mm square in which a 200 μm thick silicone rubber was laminated on a polyester film having a thickness of about 120 μm. As the ink, silver nanoparticle dispersed conductive ink (15% as a solid content of silver) was used. A glass plate of 300 mm × 400 mm square and 1.1 mm thickness was used as the substrate to be printed.

(Printing process (ink coating film formation, removal, and transfer process))
1) The conductive ink was applied to the blanket with a slit die coater, dried at room temperature for 60 seconds, and then an ink coating film was formed on the blanket.

2) The blanket on which the ink coating film is formed is formed by a wet etching method in parallel with 600 linear patterns (hereinafter referred to as fine lines) having a line width of 40 μm, a length of 30 cm, and a depth of 8 μm at intervals of 300 μm. The ink coating film in which the fine lines were formed was obtained on the blanket by uniformly adhering to the removed relief printing plate and removing the ink coating film adhering to the removal relief printing convex portion from the blanket.

3) The ink coating film on which the fine lines on the blanket are formed is uniformly adhered onto the glass plate, whereby the ink coating film is transferred from the blanket to the glass plate, and a printed matter on which the fine lines are formed is obtained. It was. The time required during this period was about 4 minutes.

(Plate washing process)
Subsequently, washing water was sprayed onto the removed relief plate to which the ink coating film had adhered using Ikeuchi 2 fluid nozzle VVEA6020S303 to remove the ink on the removed relief plate. Here, 20 L of ion-exchanged water (conductivity 0.5 μS / cm) stored in a cleaning liquid supply tank whose temperature is adjusted to 50 ° C. is used as the cleaning liquid, and the pressure of the compressed air supplied to the two-fluid nozzle is 0. The surface of the removed relief printing plate was washed by reciprocating 3 times over the removal relief printing plate for about 40 seconds at a water amount of 7 MPa and a water amount of 6 L / min. Further, the cleaning water remaining on the plate was blown and dried using an air knife, and the regeneration of the removed relief plate was completed. The time required during this period was about 2 minutes.

  Subsequently, about 4 L of the washing drainage generated by the plate washing is collected in the washing drainage collection tank 71, and the circulating pump 69 is used as a solid matter removing means 72 by Daisen Membrane Systems Co., Ltd. It sent to the outer filtration module MOLSEFA03-FC-FUS0382 (fraction molecular weight 30000), and it isolate | separated into the concentrate 72b and the permeate 72a. The concentrated liquid was retransmitted in the washing and draining liquid recovery tank 71 and circulated by the ultrafiltration module. The permeated liquid 72a was sent to a cleaning liquid supply tank (cleaning liquid storage tank) 77 to obtain a reusable cleaning liquid. The cleaning process of the cleaning effluent was completed in about 4 minutes.

  The printing process and the plate washing process were repeated 20 times in succession to produce a printed matter on which the fine lines were formed. During this time, the cleaning liquid 10L was purified and purified by the ultrafiltration module without being replaced at all, and repeatedly used as a cleaning liquid.

(Evaluation of cleaning liquid purity)
The purity of the cleaning solution used for the plate cleaning was inspected every time after the plate cleaning step using a colorimeter TCR-5Z manufactured by Kasahara Kagaku Co., Ltd. and a conductivity meter CyBerScan CON400 manufactured by EUTECH INSTRUMENTS. The color derived from the solid matter of the ink was evaluated with the chromaticity meter, and the concentration of the ionic component of the ink was evaluated with the conductivity meter.
The results are shown in Table 1.

表１に示すように、２０回の連続印刷で洗浄液の着色は全く見られなかった。

As shown in Table 1, the washing liquid was not colored at all after 20 continuous printings.

<Example 2>
As in Example 1, (print preparation) (printing process (ink coating film formation, removal, and transfer process)) was performed.

In the plate washing process, after removing solids with the cross flow ultrafiltration module, the same procedure as in Example 1 was performed except that the permeate was obtained by processing with an ion exchange resin filling apparatus G-10C manufactured by Organo Corporation. Then, printing, plate washing, and drainage purification were repeated 20 times, and drainage purification degree evaluation and pattern accuracy evaluation of fine lines of printed matter were performed.
The results are shown in Table 2.

表２に示すように、洗浄液の着色および導電率の増大が見られず、断線数は１個以下、断線率は細線６００本に対して２０回連続平均で０．０２５％、ショートは発生せず、無欠陥品の歩留まりは８５％であった。

As shown in Table 2, the coloring of the cleaning liquid and the increase in electrical conductivity were not observed, the number of disconnections was 1 or less, the disconnection rate was 0.025% on an average of 20 consecutive times with respect to 600 fine wires, and no short circuit occurred. The yield of defect-free products was 85%.

<Example 3>
As in Example 1, (print preparation) (printing process (ink coating film formation, removal, and transfer process)) was performed.

In the plate washing step, nitrogen at 80 ° C. is blown and dried at a rate of 20 L / min to the ink on the relief relief plate, and then 35 ° C. water is used at 4 L / min and an air pressure of 0.5 MPa using a two-fluid nozzle. Except for removing the ink on the plate, printing, plate washing, and drainage purification were repeated 20 times in the same manner as in Example 1 to evaluate the degree of purification of the drainage and the pattern accuracy of the fine lines of the printed matter.
The results are shown in Table 3.

表３に示すように、断線数は１個以下、断線率は細線６００本に対して２０回連続平均で０．０１７％、ショートは発生せず、無欠陥品の歩留まりは９０％であった。また排液浄化に要する時間は約３分であった。
＜実施例４＞
実施例１と同様に、（印刷準備）（印刷工程（インク塗膜形成、除去、および転写工程））をおこなった。

As shown in Table 3, the number of disconnections was 1 or less, the disconnection rate was 0.017% on an average of 20 consecutive times with respect to 600 fine wires, no short circuit occurred, and the yield of defect-free products was 90%. . The time required for drainage purification was about 3 minutes.
<Example 4>
As in Example 1, (print preparation) (printing process (ink coating film formation, removal, and transfer process)) was performed.

In the plate washing step, nitrogen at a temperature of 100 ° C. is blown and dried with an air volume of 20 L / min to the ink on the removed relief plate, and then 30 ° C. water is used at 3 L / min and an air pressure of 0.4 MPa using a two-fluid nozzle. Except for removing the ink on the plate, printing, plate washing, and permeate treated with an ion exchange resin filling device were further treated with an activated carbon cartridge filter TCC-WH-SOCP manufactured by Advantech Toyo in the same manner as in Example 3. The waste liquid was purified in the same manner as in Example 2, and printing, plate washing, and waste liquid purification were repeated 20 times to evaluate the degree of purification of the waste liquid and the pattern accuracy of the fine lines of the printed matter.
The results are shown in Table 4.

表４に示すように、洗浄液の着色および導電率の増大が見られず、断線数は１個以下、断線率は細線６００本に対して２０回連続平均で０．００８％、ショートは発生せず、無欠陥品の歩留まりは９５％であった。また排液浄化に要する時間は約３分であった。

As shown in Table 4, the coloring of the cleaning liquid and the increase in electrical conductivity were not observed, the number of disconnections was 1 or less, the disconnection rate was 0.008% on an average of 20 consecutive times for 600 fine wires, and no short circuit occurred. The yield of defect-free products was 95%. The time required for drainage purification was about 3 minutes.

<Comparative Example 1>
As in Example 1, (print preparation) (printing process (ink coating film formation, removal, and transfer process)) was performed.

In the plate washing step, printing is performed in the same manner as in Example 1 except that a microfiltration membrane TCR-020 (filtration accuracy: 0.2 μm) manufactured by Advantech Toyo Co., Ltd. is used instead of the cross flow ultrafiltration module. When plate cleaning and drainage purification were performed, the color of the cleaning liquid increased with each printing, and the conductivity exceeded the measurement limit at the third printing, and the chromaticity exceeded the measurement limit at the fourth printing, so continuous printing was stopped. did.
The results are shown in Table 5.

表５に示すように、また印刷物の細線のパターン精度も極めて低く、断線およびショート数は印刷４回目でそれぞれ３５個、２１１個と多数検出された。

As shown in Table 5, the pattern precision of the fine lines of the printed material was extremely low, and a large number of disconnections and shorts were detected as 35 and 211, respectively, at the fourth printing.

<Comparative example 2>
As in Example 1, (print preparation) (printing process (ink coating film formation, removal, and transfer process)) was performed.

In the plate washing step, printing is performed in the same manner as in Example 3, except that a microfiltration membrane TCF-010 (filtration accuracy: 0.1 μm) manufactured by Advantech Toyo Co., Ltd. is used instead of the crossflow ultrafiltration module. When the plate cleaning and drainage purification were performed, the coloring of the cleaning liquid increased every printing, and the conductivity exceeded the measurement limit at the fourth printing. Since the microfiltration membrane was clogged by the 6th drainage purification, continuous printing was stopped.
The results are shown in Table 6.

表６に示すように、また印刷物の細線のパターン精度も極めて低く、断線およびショート数は印刷６回目でそれぞれ３２個、１０８個と多数検出された。

As shown in Table 6, the pattern accuracy of the fine lines of the printed material was extremely low, and a large number of disconnections and shorts were detected as 32 and 108, respectively, at the sixth printing.

  As an application example of the present invention, it can be used for cleaning of a relief relief for reverse offset printing in a flexible device.

DESCRIPTION OF SYMBOLS 1 ... Plate washing apparatus 10 ... Plate washing | cleaning means 11 ... Plate stage 20 ... Purification | cleaning means 25 ... Cleaning nozzle 30 ... Suction nozzle 35 ... Air knife (air ejection nozzle)
DESCRIPTION OF SYMBOLS 50 ... Cleaning liquid discharge port 61 ... Blowing drying means 62 ... Blast nozzle 63 ... Blasting mechanism 69 ... Pump 65 ... Compression apparatus 69 ... Cleaning liquid supply pump 71 ... Cleaning discharge liquid collection tank 72 ... Solid substance removal means 72a ... Permeate 72b ... Concentration Liquid 72c ... Filtration means 73 ... Organic substance removal means 74 ... Ion removal means 75 ... Microfiltration means 76 ... Recycled cleaning liquid storage tank 77 ... Cleaning liquid storage tank 78 ... Cleaning liquid regeneration detection means B1, B1a, B1b, B1c ... Blanket B1d ... Print B2 , B2a, B2b, B2c ... Ink coating film B5 ... Printed substrate F ... Ultrafiltration membrane (filter material)
F0: Treatment liquid (ink-containing drainage liquid)
F1, F2 ... Permeate flow F3 ... Ink solid F8 ... Permeate flow direction P ... Drain circulation pump W ... Removal letterpress

Claims (8)

A removal relief plate cleaning device that removes unnecessary portions of ink from ink applied on a blanket,
A chamber having a first recess, the first recess facing the removal relief plate, and installed to cover the removal relief plate;
A cover having a second recess, the second recess being disposed in the first recess so as to face the removal relief plate;
A cleaning liquid is ejected from the tip portion onto the surface of the removed relief plate as a plate cleaning means that is disposed in the first recess portion and the tip portion is disposed in the second recess portion and removes unnecessary portions of ink from the removal relief plate. A cleaning nozzle to
As a purification means for purifying and regenerating cleaning waste liquid, a solid matter removing means for purifying and regenerating cleaning waste liquid by removing solids from the cleaning waste liquid containing ink after washing using a cross-flow ultrafiltration device When,
Comprising
Cleaning device.   A suction nozzle having a tip disposed in the second recess,
  The cleaning apparatus according to claim 1.   Further comprising an air knife disposed in the first recess.
  The cleaning apparatus according to claim 2. A cleaning drainage purification method used for cleaning a relief relief plate that removes unnecessary portions of ink from ink applied on a blanket , using the cleaning device according to claim 1 ,
A solid matter removing step of purifying and regenerating the washing waste liquid by removing the solid matter from the washing waste liquid containing the ink after washing using the solid matter removing means ;
Purification method. The purification method according to claim 4, wherein the ink contains a metal . The purification method according to claim 4 or 5, wherein the blanket is used when a flexible device is manufactured by reversal offset printing . A method for cleaning a relief relief plate that uses the cleaning device according to claim 1 to remove an unnecessary portion of ink from ink applied on a blanket,
A plate cleaning step of removing ink on the surface of the removed relief by ejecting a washing liquid onto the surface of the relief relief using a washing nozzle;
A cleaning liquid purification step for purifying and regenerating the cleaning drainage discharged in the plate cleaning step by the solids removing means ;
Comprising
Cleaning method.   The cleaning device has a blast drying means for drying and solidifying the ink on the removed relief printing plate,
  The cleaning method according to claim 7, further comprising a drying step of drying and solidifying the ink on the removed relief printing plate by the blowing drying unit before the plate cleaning step.

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