JP2546685B2 - Dampening equipment for printing machines - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a dampening water device for an offset printing machine, and more particularly, it is generated by ultrasonic waves for a charged printing plate on a plate cylinder. The present invention relates to a dampening water device, which is characterized by adhering ionized water particles.

[Prior Art] Conventionally, ultrasonic waves are used to generate fine particles of water,
A dampening water supply device adapted to supply dampening water to the plate cylinder is generally known from the following numerous publications.

For example, JP-A-50-138104, JP-A-52-131106, JP-A-53-9615, JP-A-53-9614, JP-A-53-9613, JP-A-53-9613 and JP-A-53-131 are disclosed in the patent or utility model publications. 9611, JP-A-53-8205, JP-A-52-132909, JP-A-60-130630 and the like are known.

However, in all of the above publications, dampening water is ultrasonically applied so that fine particles of water are directly attached to the printing plate on the plate cylinder.

[Problems to be Solved by the Invention] Conventionally, fine particles of water are atomized by ultrasonic waves,
In a dampening water supply device that supplies dampening water to the plate cylinder, since water particles are extremely fine and the surface tension of the particles is larger than the adhesive force that adheres to the plate cylinder, water particles do not adhere to the plate cylinder. Was not easy.

Furthermore, the plate cylinder is rotated continuously during printing,
Even if the water particles adhere to the plate cylinder, they are shaken off by the centrifugal force, so that it is not easy for the water particles to adhere to the plate cylinder, and practical application is difficult.

The present invention has been made in view of the above problems, and electrostatically charges and holds static electricity on the surface of a printing plate while the plate cylinder is rotating, and the cationized water fine particles are applied to the plate on the plate cylinder. An object of the present invention is to provide a dampening water supply device which is characterized in that the supply of electric power gives a suction force between the two to supply a uniform water film on the plate cylinder.

[Means for Solving Problems] A dampening water device for a printing machine of the present invention is a dampening water device for supplying dampening water to a printing plate attached to a plate cylinder of a printing machine. A coating layer of a polymeric material was provided on the surface of the cylinder, the printing plate was attached to the coating layer, and ionic water was generated as ionized water fine particles through an ultrasonic transmitter, and the printing plate and the ionization were performed. The polarities of the water particles are opposite to each other, and the ionized water particles are attached to the printing plate. Further, the coating layer of the polymer material is characterized in that it is made of nylon resin or a mixture containing nylon resin as a main component. Further, the printing plate on the plate cylinder is made of aluminum showing a cathode, and the ionized water fine particles are water fine particles ionized into cations. Further, the plate cylinder printing plate is made of a polymer material showing an anode, and the ionized water particles are anionized water particles.

[Operation] First, using a water electrolyzer, cation water and anion water are separated and stored in separate tanks. When the printing plate is made of aluminum, the cathode is charged, and when it is plastic, the anode is charged. Therefore, the ion water having a polarity opposite to the polarity is selected and used.

On the plate cylinder, a coating layer of polymeric material such as nylon is provided.
Since the printing plate is stuck on the coating layer, static electricity is generated on the printing plate due to friction between the printing paper, the blanket cylinder, and the printing plate during printing. Then, as described above, depending on the type of the printing plate, ionic water having a polarity opposite to the polarity is selected and used. This ionized water generates ionized water particles by an ultrasonic wave generator and is continuously and evenly supplied to the plate on the plate cylinder to form a water film on the plate.

[Embodiment] Next, a fountain solution device of the present invention will be described with reference to FIGS. 1, 2 and 3.
It will be described with reference to the drawings.

[First Embodiment] As shown in Figs. 1 and 2, the whole constitution of the dampening water device of the present invention is a tank 14 for storing ion water, and ultrasonic waves for generating water particles 16 by ultrasonic wave of the ion water. Generator 15, blower 17 for blowing water particles 16 of ionized water, duct 18 for supplying water particles 16 to plate cylinder 10 side, plate cylinder 10 connected to duct 18
And a distributor 19 for supplying the water fine particles 16 blown along the axial direction of.

As shown in FIG. 1, the offset printing machine of the present invention is a plate cylinder.
An aluminum printing plate 11 is attached to the aluminum plate 10, and the ink is transferred to the printing plate 11 on the plate cylinder 10 through an ink roll group (not shown) from the ink fountain on the aluminum printing plate 11 and the present invention The fountain solution device directly sprays ionized water particles onto the printing plate 11 to attach the particles, and transfers the ink to the blanket cylinder 3 that comes into contact with the plate cylinder to shade the web 13. is there.

A coating layer of a polymer material is formed on the plate cylinder 10, and a material having a polarity opposite to that of the printing plate 11 is used. In the case of this embodiment, the nylon coating layer 12 that is charged to the anode is formed by thermal spraying.

As shown in FIG. 2, the distributor 19 is a slit duct which is branched from a duct 18 into four, and which is provided with slit-like openings 20 in the axial direction along the plate cylinder 10 for supplying water fine particles 16.
21 are installed.

A slit 22 is provided with a flow rate adjusting valve 23 for adjusting the flow rate of water particles in the middle of a branch passage 22 that is divided into four branches of the doub
The concentration of the water particles 16 in 21 is made uniform.

The method of producing ionized water is a known technique, and as shown in FIG. Set up 27. Electrodes 28 and 29 are provided in the left and right compartments 26 and 27, respectively, and the electrodes 28 and 29 are connected to a commercial power source via a rectifier. Therefore, when the water in the container 2 is electrolyzed through the electrodes 28 and 29 by the commercial power source, cationized water and anionized water are produced in the left and right compartments 26 and 27, respectively.

Therefore, the cationized water or anionized ionized water can be selectively used depending on the polarity charged on the plate cylinder side.

That is, if the printing plate 11 is aluminum, for example,
Ion water uses cation water of the opposite polarity because it is charged to the negative polarity by static electricity. Further, when a polymer material is used for the printing plate 11, since the printing plate exhibits an anodic property, anion water of opposite polarity may be used as the ionic water.

 Next, the operation of this embodiment will be described.

First, ionic water is manufactured using the water electrolyzer shown in FIG. 3, and when the printing plate 11 is aluminum, cationized water is poured into the ionic water tank 14. This ionized water continuously generates fine water particles 16 that have been ionized by the ultrasonic generator 15. The water fine particles 16 pass through the duct 18 and the distributor 19 by the blower 17, and after the flow rate is adjusted by the flow rate adjusting valve 23, the water fine particles 16 from the slit of the slit duct 21.
And spray the plate with dampening water. In the process up to the ejection of ionized water, the metal parts are all coated with plastic. This coating treatment is for preventing the ionic water from being neutralized.

On the other hand, when the surface of the metal plate cylinder 10 is coated with nylon resin, the aluminum coating plate 11 is adhered to the upper surface of the nylon coating layer 12, so that the nylon coating layer 12 is charged to the anode and the printing is performed. A uniform charge is generated on the plate surface, whereby a predetermined amount of cationized water particles are supplied, and a uniform water film can be formed on the printing plate 11.

On the other hand, when a printing plate made of a polymer material is used on the plate cylinder 10, the printing plate 11 is charged to the anode, so that the fine particles 16 of anion water can be uniformly attached to the printing plate 11.

[Effect of the Invention] As described above, according to the present invention, by electrically charging the negative electrode by static electricity on the surface of the plate cylinder or the fountain roller, and supplying water particles charged with cations to the plate cylinder,
A suction force due to the electric charge acts between the two, and a uniform water film can be formed on the plate cylinder or the watering roller, and the dampening water device shown in FIG. 2 which has been conventionally used is not required. Therefore, according to the dampening water device of the printing machine of the present invention, the equipment cost can be reduced.

Further, by forming a film of a polymer material on the plate cylinder, a uniform charge is held on the printing paper, the Brakent cylinder, and the plate on the plate cylinder, and a predetermined amount of ionized water particles are supplied to this. As a result, dampening water having a predetermined film thickness can be supplied, so that print quality can be improved.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a dampening water device of the present invention, FIG. 2 is a partial front view showing the arrow Z of FIG. 1, and FIG. 3 is a sectional view showing electrolysis of water. 10: plate cylinder, 11: printing plate, 14: tank, 15: ultrasonic generator, 1
6: Ionized water particles, 17: Blower, 18: Duct, 19:
Distributor, 20: slit, 21: slit duct, 23: flow control valve, 32: frame.

Claims (4)

(57) [Claims] 1. A dampening water device for supplying dampening water to a printing plate attached to a plate cylinder of a printing machine, wherein a film layer of a polymer material is provided on the surface of the plate cylinder, and the film layer is formed on the film layer. The plate is adhered to, and ionized water is generated as ionized water particles through an ultrasonic transmitter, and the printing plate and the ionized water particles have opposite polarities,
A dampening water device for a printing machine, wherein the ionized water particles are attached onto the printing plate. 2. The fountain solution device for a printing machine according to claim 1, wherein the coating layer of the polymer material is made of nylon resin or a mixture containing nylon resin as a main component. 3. The plate according to claim 1, wherein the plate on the plate cylinder is aluminum showing a cathode, and the ionized water particles are water particles ionized into cations. Fountain solution for printing machines. 4. The printing machine according to claim 1, wherein the plate cylinder printing plate is made of a polymer material showing an anode, and the ionized water particles are anion water particles. Dampening water device.