Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
  • B41C1/00—Forme preparation
  • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
  • B41C1/105—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by electrocoagulation, by electro-adhesion or by electro-releasing of material, e.g. a liquid from a gel
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/20—Duplicating or marking methods; Sheet materials for use therein using electric current

Definitions

• the present invention relates to improvements in the field of electrocoagulation printing. More particularly, the present invention relates to an electrocoagulation printing method and an apparatus for improving the coagulation efficiency during electrocoagulation printing and improving the reflection density of printed matter.
• the electrocoagulated printing ink supplied in the gap defined between the anode and the cathode is essentially an electrolytically coagulable polymer, liquid medium, soluble electrolyte and colored It consists of a solution or dispersion containing the agent.
• the coloring agent used is a pigment
• a dispersing agent is added to uniformly disperse the pigment in the ink.
• any remaining non-solidified ink is removed from the anode surface, for example, by rubbing the surface with a soft rubber squeegee. This ensures that the colored solidification ink which is subsequently transferred onto the substrate is completely exposed.
• the surface of the anode is cleaned using a plurality of rotating brushes and a cleaning solution to remove any remaining solidified ink and oily substances adhering to the surface of the anode.
• one printing unit is defined by arranging a cathode and anode, an oily substance coating device, an ink supply device, a rubber squeegee, and an anode washing device.
• several printing units using colorants of different colors are arranged in front and back, and at each transfer position.
• the printing unit is a single unit adapted to bring the dot of the colored solidified ink formed by each printing unit into contact with the substrate. It can also be placed around a single roller.
• the base which is in the form of a continuous web, can be placed around the roller. It passes through each transfer position in order to print images that are wrapped around and that are variously colored by superposition.
• the electrocoagulation printing method described in the aforementioned U.S. Pat. No. 4,895,629 is generally carried out at room temperature, which is about 25-30.degree.
• the inventors have found that at a temperature of 30 inks, a voltage of 55 volts is applied between the cathode and the anode for a period of 4 microseconds on the anode active surface. He noticed that the maximum reflection density of the dot of the colored solidified ink printed on the substrate was 1.60. When the voltage is increased to 60 volts under the same conditions, the reflection density of the coagulated ink does not increase conspicuously, and rather, the undesirable gas between the electrodes. An outbreak occurred. Furthermore, when gas generation was controlled by decreasing the concentration of the electrolyte in the ink, a decrease in the reflection concentration of the solidified ink was observed.
• the inventor has proposed that a substrate for electrocoagulation printing be used in order to prevent a part of the dot of the colored coagulation ink from remaining on the anode when transferred from the anode active surface to paper.
• a substrate for electrocoagulation printing be used in order to prevent a part of the dot of the colored coagulation ink from remaining on the anode when transferred from the anode active surface to paper.
• much of the paper used should be humidified by spraying with water. Without humidification of the paper, only about 60-70% of the colored coagulated ink is transferred to the dry paper, with the remainder remaining on the anode surface.
• an object of the present invention is to solve the above-mentioned drawbacks and to provide a method and apparatus for increasing the efficiency of solidification and improving the reflection density of printed matter in electrocoagulation printing. That is.
• the improved electrocoagulation printing method of the present invention comprises:
• An electrocoagulation printing method characterized in that the step (a) is performed while maintaining the anode active surface and the ink at a temperature of about 35 ° C. to about 60.
• the apparatus for performing the improved electrocoagulation ⁇ printing method of the present invention comprises:
• Heating means for maintaining the temperature between the anode active surface and the ink at about 35 to about 60 ° C;
• the improved electrocoagulation printing method is described in more detail. That is, the present invention provides an improved electrocoagulation printing method comprising the following steps;
• anode with a continuous passivating surface that moves along a given path at a substantially constant speed; an electrolytically solidifiable polymer, a liquid medium, a soluble electrolyte and Electrocoagulation from a solution or dispersion containing a colorant
• the electrocoagulation of the electrolytically coagulable polymer present in the printing ink causes the coagulation to produce the desired image.
• An electrocoagulation printing method including a step, wherein the step (a) is performed while maintaining the anode active surface and the ink at a temperature of about 35: to about 60 ° C.
• An electro-solidification printing method characterized by the following: By maintaining the anode active surface and the ink at a temperature of about 35 ° C to about 60, the electrical conductivity of the ink increases in step (a), and the ink is transferred from the anode active surface to the ink. Dissolution of metallic ions increases. As a result, a sufficient amount of metal ion is eluted to increase the reflection density of the solidified ink, and the solidification efficiency in the step (a) is increased.
• Decomposition of the oxide surface layer forming the passivation is likely to occur in the presence of an electrolyte anion such as, for example, CI—, Br—, I—
• an electrolyte anion such as, for example, CI—, Br—, I—
• oxygen is gradually replaced by the halogenated anion, and oxygen adsorbed on the metal surface is also replaced by the halogenated anion.
• the decomposition rate of the oxide surface layer explosively increases with the application of voltage. That is, the formation of a soluble metal halide occurs on the metal surface. In other words, local dissolution of the oxide surface layer occurs at the decomposition site, which elutes metal ions into the electrolyte.
• the dissolution of the oxide surface layer on such an anode would be Fe It produces 3+ and Al3 + ions.
• these trivalent ions initiate the coagulation of the ink.
• the present invention surprisingly, within the range of about 35 to about 60, preferably about 35 t: to about 50 T :, and more preferably about 50 T: Increasing the temperature of the anode active surface and the temperature of the ink from 35 ° C to about 45 ° C increases the electrical conductivity of the ink, which is useful for electrocoagulation.
• Anode not just The local rate of dissolution of the upper oxide surface layer is also increased, which allows more metal ion to be eluted into the ink. I knew that If the temperature of the anode active surface is lower than 35 ⁇ , the amount of metal ions released to the ink will increase in order to obtain the desired increase in the reflection density of the solidified ink. Is not enough. At temperatures above 60 ° C, the problem of condensation of water vapor on the device occurs.
• the reflection density according to the method of the present invention is 1.7. It is now possible to obtain a dot of colored solidified ink which is 0. Brief description of ⁇ ⁇
• FIG. 1 is a diagram showing an outline of an electrocoagulation printing apparatus 1 of the present invention.
• Figure 2 shows an example of heating a cylindrical anode.
• a heated liquid or gas By passing a heated liquid or gas through a hole formed in the central axis, the cylinder-shaped anode is heated and maintained at about 35 to about 60.
• Figure 3 shows an example of a heating device that heats the electrocoagulated printing ink before supplying it to the anode active surface. As the ink passes through this apparatus, it is heated and maintained at about 35 to about 60.
• FIG. 4 is a diagram showing an example of a heating means for externally heating the anode active surface.
• FIG. 5 shows an example in which the anode is heated by the cleaning liquid. That is, in this example, the cleaning liquid is heated, and the heated cleaning liquid is blown toward the anode to heat the cylindrical anode.
• FIG. 6 is a cross-sectional view showing an outline of a cleaning means for cleaning the anode active surface to remove all residual solidified ink from the anode active surface. It has a spraying means for spraying the cleaning solution toward the anode surface.
• Figure 7 is a graph showing the change in the electrical conductivity of the ink as a function of the temperature of the ink. As shown, the electrical conductivity of the ink increases with increasing temperature.
• Figure 8 is a graph showing an example of the relationship between the anode active surface and the temperature of the ink and the reflection density, and the reflection density is increased by increasing the temperature more than 35. It is shown that is increased.
• the steps (a) and (b) of the electrocoagulation printing method are repeated several times, and are arranged at predetermined positions along a predetermined path.
• a corresponding number of printing stages, each using a different colorant, are defined and thereby transferred to the substrate at each transfer position in order to obtain a multicolor image
• Images colored in various colors of the solidified ink are obtained.
• the anode used was an endless moving belt, such as that described in U.S. Patent No. 4,661,222.
• the anode active surface is heated by heating the anode active surface, supplying ink to the heated electrode surface, and transferring heat from the anode active surface to the ink. And are maintained at a temperature of about 35-60.
• the step (a) of the electrocoagulation printing method is carried out as follows.
• i) are electrically insulated from each other, installed in a linear array, arranged on a plane parallel to the central axis of the anode, and with a certain predetermined gap.
• a cathode that defines a series of corresponding cathode active surfaces spaced from the anode active surface, with the cathode at least a distance at least equal to the electrode gap.
• a voltage is applied to a selected one of the plurality of cathodes to apply an oily substance facing the electrode active surface of the applied cathode.
• Anode active surface Causing the ink to coagulate selectively one after another, thereby forming a dot of colored coagulated ink;
• the cathodes may be separated from each other at a distance equal to or greater than the electrode gap.
• the spacing prevents edge corrosion of the cathode.
• applying an oily substance to the anode before selective application to the cathode weakens the adhesion of the solidified ink to the anode and prevents uncontrollable corrosion of the anode. I can do it.
• an oily substance when a voltage is applied to the cathode, the gas generated as a result of the electrolysis when the voltage is applied to the cathode becomes an oily substance. Gas is not accumulated between the cathode and the anode because it is consumed by the reaction with the substance.
• anode and cathode examples are stainless steel, white gold, chrome, nickel, tin and aluminum.
• the anode is formed from stainless steel, aluminum or soot, and the passivation on such an electrode when a voltage is applied to the cathode.
• the trivalent ion is generated by the dissolution of the oxide surface layer that forms the iron oxide, and then the trivalent ion starts solidification of the ink.
• the gap defined between the anode and the cathode ranges from about 50 nm to about 100 nm, and the smaller the electrode gap, the more coagulation that occurs.
• the ink dot is a sharp You. If the electrode gap is of the order of 50 m, the cathodes are preferably spaced from one another at a distance of about 75 m.
• oily substance used for applying to the surface of the anode in the steps (a) and (ii) it is preferable to use an oily substance.
• olefinic substances are unsaturated fatty acids such as arachidonic acid, linoleic acid, linolenic acid, oleic acid and palmitoleic acid.
• unsaturated vegetable oils such as corn oil, linseed oil, olive oil, peanut oil, soybean oil and sunflower oil.
• the olefinic material can be applied to the anode active surface in the form of an oily dispersion containing the metal oxide as a dispersed phase.
• suitable metal oxides are aluminum oxide, cerium oxide, chromium oxide, cupric oxide, magnesium oxide, manganese oxide, titanium dioxide. , Zinc oxide.
• the amount of metal oxide ranges from about 15% to about 40% by weight, based on the total weight of the dispersion.
• Particularly preferred dispersions contain about 75% by weight of oleic or linoleic acid and about 25% by weight of chromium oxide. Operating at a temperature of about 35 to 60 reduces the concentration of metal oxides in the oily dispersion and thus reduces the wear on the anode active surface. Can be done.
• the oleaginous material advantageously extends parallel to the cylindrical anode and has a distribution roller having a surrounding coating made of an oxide ceramic material.
• a distribution roller having a surrounding coating made of an oxide ceramic material.
• An oily substance is applied on the surface to form a film of the oily substance on the surface of the ceramic coating to uniformly cover the surface of the ceramic coating. At this time, the film of the oily substance is substantially formed.
• a cell comprising an oxide ceramic material.
• the coating of the oily substance can be uniformly coated on the surface of the ceramic coating. Can be formed on the surface of such coatings, after which the film of oily material separates into microdroplets having a substantially uniform size and distribution. Is done. Microdroplets formed on the surface of the ceramic coating and transferred onto the anode active surface generally range in size from about 1 to about 5 / m. Yes.
• a particularly preferred oxide ceramic material for forming the ceramic coating is a molten mixture of aluminum and titanium. .
• Such a mixture may consist of about 60 to about 90% by weight of alumina and about 10 to about 40% by weight of titania.
• the applicator roller is arranged parallel to the dispensing roller and in a pressure-engaged engagement therewith. Forming a first zip, rotating the applicator roller and the distribution roller in alignment
• the oily substance is supplied to the first nip, and as it passes through the first nip, the oily substance uniformly covers the surface of the ceramic coating.
• the oily substance is applied to the ceramic coating by forming a film.
• the transfer roller is arranged in parallel with the dispensing roller and in a state of being engaged by applying pressure to form a second nip, and the transfer roller is formed.
• a third nip is formed by placing the roller in a state where the roller is engaged with the anode by applying pressure, and a second nip distributes the droplets of the mouth opening from the roller to the transfer roller.
• the transfer roller is then aligned with the anode to transfer the microdroplets from the transfer roller to the anode in the third nip.
• the micro droplets are transferred from the dispensing roller to the anode by rotating them.
• the applicator roller and the transfer roller each have a surrounding coating of an elastic material, such as a synthetic rubber material, which is resistant to oily substances. It is prepared.
• an elastic material such as a synthetic rubber material
• the Shore A hardness is about 50 to about 70
• the Shore A hardness is about 60
• Polyurethane which is about 80, can be used.
• the inventors have found that, depending on the type of oily substance used, the film of oily substance is partially separated on the surface of the ceramic coating. And found that the desired microdroplets were not obtained. Therefore, the skin of the oily substance to ensure that the membrane is virtually completely microscopic droplets of oleaginous material of uniform size and distribution over the ceramic coating.
• the steps (a) and (ii) of the electrocoagulation printing process of the present invention are carried out in parallel with the cylindrical anode and from the oxide ceramic material.
• a coating of an oily substance is formed on the surface of the ceramic coating by coating the coating on the ting to evenly cover the surface of the ceramic coating, and the coating of the oily substance is substantially formed.
• Skin at least partially separated into microdroplets of uniform size and distribution, and at least partially separated From the first dispensing roller to the second distributing roller so that the coating is substantially on the ceramic coating of the second distributing roller.
• Substantially and completely separate the desired microdroplets of uniform size and distribution, and the second distribution roller's ceramics This is done by transferring microdroplets from the cocoon coating onto the anode active surface.
• the ceramic coating of the first distribution roller and of the second distribution roller is of the same oxide ceramic material. .
• Such a roller arrangement is preferably described in U.S. Pat. No.
• the ablocator roller is arranged parallel to the first distribution roller and in a state of being engaged by applying pressure thereto. Form a two-part When supplying the oily substance to the first nip while rotating the pre-mixer roller and the first distribution roller in alignment with each other and passing through the first nip. In addition, the oily substance forms a film that uniformly covers the surface of the ceramic coating, thereby distributing the oily substance to the first distribution roller. Apply on ceramic coating.
• the first transfer roller is arranged between and parallel to the first distribution roller and the second distribution roller. Then, the first transfer roller is placed in a state where the first transfer roller is engaged with the first distribution roller by applying pressure to form a second nip, and the second distribution roller is formed. A third nip is formed by applying pressure to the roller and engaging the roller, and a second nip is used to distribute the at least partially separated coating to the first nip. To transfer from the roller to the first transfer roller, the first distribution roller and the first transfer roller are rotated in alignment with each other, and the second distribution roller is rotated.
• a second transfer roller is arranged in parallel with the second transfer roller and in a state where the second transfer roller is engaged by applying a pressure thereto, thereby forming a fourth nip.
• the second transfer roller, the second transfer roller, and the second transfer roller by placing the transfer roller of the second transfer roller in the engaged state by applying pressure to the anode.
• the third nip rotates at least partially the separated coating from the first transfer roller and the second distribution roller.
• To the second transfer roller, and then the fourth drop transfers the droplets from the second distribution roller to the second transfer roller, and then to the fifth transfer roller.
• Micro droplets in the second The transfer of the at least partially separated oily substance film from the transfer roller to the anode by the transfer from the first distributor to the second distributor To the roller, and the droplets of the mouth are transferred from the second distribution roller to the anode.
• a roller arrangement is also described in US Pat. No. 5,538,838.
• the first transfer roller and the second transfer roller are each made of an elastic material resistant to oily substances. With a surrounding cover.
• the anodic active surface coated with an oleaginous substance is preferably preceded by step (a) (iii) to increase the adhesion of the microdroplets on the anodic active surface.
• Polished for example, a rotating brush consisting of horse hair and having a tip that contacts the surface of the anode and having a plurality of bristles extending radially can be used. It has been found that the friction created by the bristles in contact with the surface as the brush rotates increases the adhesion of microdroplets on the anode active surface.
• the steps (a) and (iii) of the electrocoagulation printing process advantageously comprise the step of continuously inking the ink from an ink supply arranged adjacent to the electrode gap onto the anode active surface. So that the ink flows along the anode active surface and as the anode rotates, the ink is carried to the electrode gap and fills the electrode gap. It is carried out by doing. Preferably, the excess ink flowing out of the anode active surface is collected and the collected ink is recycled to the ink supply. You.
• Electrocoagulable electrocoagulated printing inks include at least an electrolytically coagulable polymer, a colorant, a liquid medium and a soluble electrolyte.
• the weight average molecular weight of commonly used polymers is from about 100,000 to about 1,000,000, preferably 100,000 to 600,000. 0 0 0.
• polymers include natural polymers such as albumin, gelatin, casein, and agar, and polyacrylic acid. And synthetic polymers such as polyacrylamide.
• the polymer is an anionic copolymer of acrylamide and acrylic acid having a molecular weight of about 250,000, for example, cyanamide. It is sold under the trade name Accostreng 86 by Cyanamid Inc. (Cyanamid Inc.).
• the polymer is preferably present in an amount of about 6.5 to about 12% by weight, based on the total weight of the ink, and more preferably about 7 to about 10% by weight. Used in% amount.
• Preferred electrolytes are halogenated alkali metal salts such as lithium chloride, sodium chloride, chloride chloride, and potassium chloride chloride. And alkaline halide metal halides. Potassium chloride is particularly preferred.
• the electrolyte is used in an amount of about 4.5 to about 10% by weight, based on the total weight of the ink.
• the electrolyte is used in an amount of about 4.5 to about 10% by weight, based on the total weight of the ink.
• Dyes or pigments can be used as colorants. Dyes include indigo, azo, anthraquinone, fluoroan, dioxazine, oxazine, and phthalocyanine dyes. Dye is removed.
• Pigments include azo, phthalocyanine, quinacridone, anthraquinone, dioxazine, thioindigo, and perinon.
• Organic pigments such as phenol, perylene, isoindolinone and azomethine, and inorganic pigments such as carbon black.
• a dispersant is added.
• an anion-based dispersant which is a metal salt of a naphthalene sulfonate formalin condensate is preferable.
• the pigment is used in an amount of about 6.5 to about 12% by weight and the dispersant is used in an amount of about 0.4 to about 6% by weight, based on the total weight of the ink. Used in.
• liquid medium for dissolving or dispersing the polymer, the colorant and the electrolyte to provide a desired ink it is preferable to use water.
• any remaining non-solidified ink is removed from the anode active surface, for example by rubbing the surface with a soft rubber squeegee, to give a colored solidified solid. Exposing the ink completely. Preferably, the non-coagulated ink thus removed is collected, and the collected non-coagulated ink is mixed with the collected ink and returned to the ink supply means. Circulate.
• the reflection density of the dot of the colored solidified ink can be changed by changing the voltage and / or the pulse width of the pulse modulation signal applied to the cathode.
• the substrate is in the form of a continuous web.
• step (b) is performed using a pressure drum extending parallel to the cylindrical anode at the transfer position and in pressure-engaged engagement therewith. And to guide the impression cylinder to be driven by the anode as it rotates and to allow the web to pass through the zip. It will be implemented.
• the impression cylinder is provided with a surrounding covering of synthetic rubber material such as polyurethane having a Shore A hardness of about 95.
• synthetic rubber material such as polyurethane having a Shore A hardness of about 95.
• Polyurethane coatings having such hardness have been found to further improve the transferability of the colored solidified ink from the anodic active surface to the substrate.
• the pressure applied between the anode and the impression cylinder preferably ranges from about 50 kg Z cm 2 to about 100 kg / cm 2 .
• the anodic active surface is generally washed to remove any remaining solidified ink from the anodic active surface.
• the anode is rotatable in a predetermined direction and comprises an elongated rotating brush extending parallel to the central axis of the anode,
• the brush is made of horse hair and has a tip that contacts the anodically active surface and includes a plurality of radially extending bristles, the bristles frictionally engaging the anodically active surface.
• a jet of pressurized cleaning solution is blown against the anode active surface from one or both sides of the brush, leaving any residue.
• any solidified ink that is removed is removed from the anodic active surface.
• heating the cleaning solution heats the anodic active surface in contact with the cleaning solution, providing an ink on the heated anode surface.
• heat is transferred from the anode active surface to the ink, and as a result, the anode active surface and the ink can be maintained at a temperature of about 35 to 60.
• FIG. 1 is a diagram showing an outline of an electrocoagulation printing apparatus 1 of the present invention.
• the electrocoagulation printing apparatus 1 has a base plate 5 erected by a plurality of feet 3, and a plurality of frames 7 extend vertically on the base plate 5. It is standing upright.
• a pair of vertical plates 9 are provided at the top of the frame 7, and each vertical plate 9 is rotated by a drive motor (not shown) and has a cylindrical shape.
• Anode 11 is sandwiched. The anode 11 is stretched in a direction perpendicular to the paper surface in FIG. 1 and has an anode active surface.
• the electrocoagulation printing apparatus 1 includes an application means 13 for applying an oily substance to the positive electrode active surface along the anode 11 and forming micro droplets of the oily substance on the positive electrode active surface.
• Ink supply means 15 for supplying an electrocoagulated printing ink to the anode, and colored coagulation representing a desired image by the electrocoagulation of the ink.
• a printing head 19 having a cathode 17 for forming a plurality of dots of ink on the anodic active surface is provided, and the non-coagulated ink which has not solidified is anodically activated.
• a removal means 21 such as a squeeze for removal from the surface is provided.
• An impression cylinder 23 is provided as a means for transferring the image to the substrate and thereby printing the image on the substrate.
• a cleaning means 25 is provided below the anode 11 for cleaning the anode active surface to remove any residual solidified ink from the anode active surface.
• the ink is supplied.
• the ink is supplied between the cathode 17 and the anode 11 of the print head 19 by the means 15.
• the supplied ink is coagulated by applying a voltage between the electrodes to form a dot of the coagulated ink, and the non-coagulated ink that has not coagulated is a skid 21 From the anode active surface.
• the present invention also provides an electrocoagulation printing apparatus having the above-mentioned configuration, further comprising: The method is characterized in that a heating means is provided for maintaining the pressure at 35 to about 60.
• the heating means is, for example, heating the anode active surface, supplying ink to the heated anode surface, and transferring heat from the anode active surface to the ink.
• the temperature between the anode active surface and the ink can be maintained at about 35 ° C to about 60 ° C.
• Figure 2 shows an example of the anode heating means.
• the heating means 30 injects the heated liquid or gas T from a hole 31 opened in the center axis of the rotating cylindrical anode 11, and heats the liquid.
• the anode active surface is heated from the inside by passing through the inside of the cylindrical anode so as to be discharged from the hole 33 opened in the shaft. Hold at 0 with.
• Reference numeral 35 indicates a liquid medium stored inside the cylindrical anode when a liquid medium is used as a heating medium for the anode.
• the ink can not only be heated by the anode active surface as described above, but can also heat the ink itself. This can be achieved, for example, by heating the ink using a device as shown in FIG. 3 and introducing the heated ink via the ink supply means onto the positive electrode active surface. Can be achieved.
• the ink heating device 40 shown in FIG. 3 the ink I introduced into the thermostat 41 from the inlet 43 is heated to a predetermined temperature, and the ink I exits from the outlet 45. Guided to supply means.
• the anodic active surface can be externally heated.
• a heated liquid or gas is sprayed on the anode surface, thereby heating the anode active surface, further heating the ink, and forming the anode active surface and the ink. Should be maintained at about 35 ° C to about 60 ° C.
• FIG. 4 is a diagram showing an example of a heating means for externally heating the anode active surface.
• the heating means 50 is heated by a heating device 53 such as an injection heater in a water tank 51, and water maintained at a constant temperature is supplied to a high-pressure pump 55. This is done by circulating more.
• the hot water circulated through the inlet pipe 56 is sprayed onto the cylindrical anode 11 by the injection means 57 to heat the anode surface and to discharge the water. 8, it is configured to return to the water tank 51 via the return pipe 59.
• This heating means may be provided alone, but it is more preferable when combined with the washing means.
• FIG. 5 shows an example in which the anode is heated by the cleaning liquid.
• the electrocoagulation printing apparatus 1 is provided with a heating means 50 for externally heating the anode active surface, heats the cleaning liquid, sends it to the cleaning means 25, and blows the cleaning liquid onto the anode surface.
• the attachment heats the surface of the anode 11.
• the heated cleaning liquid enters the cleaning unit through the high-pressure pump 55 from the supply nozzle 56 and is circulated through the return pipe 59.
• FIG. 6 shows the anodic active surface after cleaning the anodic active surface.
• FIG. 6 is a cross-sectional view showing an outline of a cleaning means 25 for removing all remaining coagulated ink.
• the cleaning means 25 extends parallel to the central axis of the cylindrical anode 11 which is rotatable in a predetermined direction, and has a tip contacting the anode active surface.
• a plurality of bristles 63 extending radially, the bristles 63 being elongated in a direction opposite to the direction of rotation of the cylindrical anode 11 so that the bristles 63 frictionally engage the anode surface 65.
• Injecting means 57, 5 for spraying a jet of pressurized cleaning solution onto the rotating brush 61 and the anode active surface from one or both sides of the brush. 7 '.
• the injection means 57, 57 ' have a pipe 69 extending parallel to the central axis of the anode 11 and having a plurality of spaced nozzles 67, the pipe 69 being a tube. It is connected to the high-pressure pump 53 via the valve 71.
• the brush 61 rotates about the shaft 62 in a direction opposite to the direction of rotation of the anode 11, and the bristles 63 rub the anode surface 65, causing the cleaning liquid to jet. Clean the anode surface together with the anode.
• the cleaning liquid is heated, and the heated cleaning liquid is blown onto the anode active surface to thereby heat the anode active surface, and the heated anode active surface is heated.
• the cleaning liquid is heated, and the heated cleaning liquid is blown onto the anode active surface to thereby heat the anode active surface, and the heated anode active surface is heated.
• the cleaning solution sprayed toward the anode temporarily accumulates in the bath 73 inside the apparatus, and is overflowed from the drain tube 75. Then, the water is circulated back to the water tank 51 via the valve 77. Excess cleaning liquid adhering to the anode surface 65 is removed from the surface by the skid roller 81 rotating in the opposite direction to the anode 11 or by a skid blade (not shown). The surface of the roller 111 is removed and continuously cleaned by a brush 83 rotating in the opposite direction to the roller 81, squeegee Rollers 81 and brushes 83 are isolated from brushes 61 by partitions 84.
• Reference numeral 79 denotes a drainage pipe for discharging the cleaning liquid, which is controlled by a valve 77.
• the heating means is not limited to only one means, but a plurality of heating means.
• a plurality of heating means it is possible to employ a plurality of heating means so that the anode is heated from the inside and, at the same time, the anode is also heated from the outside by the cleaning liquid. it can.
• means for directly heating the ink can also be employed.
• the electrocoagulation printer used is shown in Fig. 5, and the cleaning liquid is heated by a heating device installed in the cleaning liquid tank, and the cleaning liquid is blown to the anode, so that the anode active surface And ink were heated to the specified temperature.
• An oily substance for forming microdroplets of an oily substance on the anode active surface is obtained by dispersing about 25% by weight of a metal oxide (chromium oxide) in oleic acid.
• a metal oxide chromium oxide
• a test pattern was printed by applying a voltage of 40 ports between the electrodes for a predetermined time.
• a strip-shaped patch portion in which the printing density was changed stepwise, a character, and a photograph portion were formed.
• the reflection density was measured by using a reflection densitometer manufactured by X-Rite, and measuring the maximum density portion and the patch at the 50% density portion.
• the electrocoagulation printing method of the present invention by changing the application time of the voltage, the volume of the dot of the coagulation ink is changed, and the amount transferred to the substrate is thereby changed. By changing, it gives a change in concentration. Obedience The increase in the reflection density of both the maximum density part and the 50% density part is considered to be the result of the improvement in the coagulation efficiency of the ink.
• the electric conductivity of the ink increases as the temperature increases.
• the reflection density increases with the increase of the printing temperature, and shows a substantially constant value at 35 ° C. or higher, indicating that the reflection density between the anode active surface and the ink is low.
• Temperature from about 35 to about 60 ° C, preferably from about 35 to about
• the solidification efficiency of the ink was improved by keeping the temperature at about 35 to about 45 ° C, more preferably at 50 ⁇ .

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• 1997
  • 1997-12-26 WO PCT/JP1997/004903 patent/WO1998029253A1/ja not_active Ceased
  • 1997-12-26 EP EP97950435A patent/EP0931666B1/en not_active Expired - Lifetime
  • 1997-12-26 DE DE69705850T patent/DE69705850T2/de not_active Expired - Fee Related

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