JPH062427B2 - Image recording method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In the known lithographic printing (offset printing), a printing plate or printing plate in which an image line to be printed and a non-image part are present in substantially the same plane is used. The image areas are rendered water repellent and thus ink receptive, whereas the non-image areas are made water absorbent and thus ink repellent in the presence of water. In the printing press the printing plate is first moistened by a moisturizing roller, the non-image areas receiving water or other moisturizers,
Many accept alcohol diluted with water. Subsequently, the printing plate is inked by an inking roller, and the image area which is not absorbed at this time receives the ink, but the moistened area repels the ink. The ink image present on the printing plate is transferred to a rubber roller, and from this rubber roller, a material to be printed, mostly paper, is transferred. Therefore, printing is indirect printing. The premise is an ink-absorbent or ink-repellent printing plate that forms a so-called storage device for always reversing printing.

In fact, image recording methods which work without mechanical storage, i.e. without printing plates, are already known. However, these methods use mechanically controlled elements, such as the ink jet method of inking individual points on the image surface using ink jet nozzles. The quality and speed of these methods are limited and not suitable for high value image recording methods. Similarly, other direct recording methods known from facsimile technology also fail to meet the qualitative requirements of high value image recording.

The present invention relates to a novel image recording method which avoids substantial storage and works with purely electronic storage and thus does not require a prepared printing plate. The whole method is thus considerably simplified and, above all, facilitated, and the exchange of printed text or images can easily be carried out without mechanical actions such as removing the old printing plate and mounting a new printing plate. Nevertheless, the quality of the image record is maintained.

Furthermore, the novel method allows the length of the image to be recorded to be arbitrarily selected, does not cause loss of the recording material, for example, the web, and, for example, in the case of offset printing, such as the circumferential surface of the plate cylinder. It offers the advantage that the length is not limited by the actual storage.

According to the invention, the material to be recorded, for example the web, is directly exposed to the moisturizer and the recording ink without an intermediate carrier. The material to be recorded is treated with an electron energy source in order to achieve the necessary changes in moisturizer and ink receptivity for recording. This energy source is controlled by the electronic recorder. If the same text is recorded many times, the contents of the electronic storage device are retrieved again at each printing step.

The image recording method according to the present invention comprises applying a laser beam to a recording surface of a recording material that is water repellent and becomes absorbent of moisture by irradiation, or absorbent absorbent and can be changed to moisture repellent by irradiation. Radiation energy selected from the group consisting of an anode wire and an ultrasonic wave source is controlled and irradiated according to the image recording information, and then a moisturizer and a moisturizer are applied to the printing surface of the irradiated recording surface. It is characterized in that it has a step of supplying a hydrophobic ink with a wetting agent repellent property.

It is possible to make the recording material moisture repellent and to make it moisturizer-receptive by irradiation, but the reverse method is used, that is, the recording material is basically moisturizer-receptive and It is also possible to make it water repellent. Accordingly
Control of energy sources should be positive or negative regarding the text to be procured.

Various types of energy sources can be used for irradiating the recorded material. Depending on the nature of the material to be recorded, it is also possible to use a laser beam or an anode line and an ultrasonic source directly for irradiation.

Advantageously, the material to be recorded is provided with a surface coating layer which allows the desired effect moisture repulsion or moisture absorption. In the simplest case, a high-gloss surface layer can be used, the surface of which can be roughened, for example by laser irradiation.

However, it is also possible to use chemical layers and to modify them in any desired way. Direct image recording according to the invention can also be carried out with a heat-sensitive surface layer.

These surface layers can be provided on the used paper in a step separate from the original recording step. However, it is also possible to apply the coating immediately before recording.

An image recording machine for carrying out the present method is a device for continuously moving a recording object, a device for controlling a laser beam in accordance with image recording information, and irradiating the recording surface of the recording object for traveling, In the case of multi-color recording, which consists of a moisturizer and a roller for applying a repellent hydrophobic ink of the moisturizer to the recording surface of the recording medium that has been irradiated with laser light, the paper already printed The surface can again be given the desired absorbency for moisturizers and other inks by a new coating process.

In the case of multicolor recording, in the case of the normal multicolor recording, the register is recorded in the first color record for registration, and the register starts the pulse extraction from the storage device in the next color record. The need for an unequivocal transfer from one recorder to the next, which is necessary for

Similarly, register marks can be recorded together for starting the cutting machine and for directly controlling the archival record retrieved from the storage device.

FIG. 1 shows a schematic representation of the device according to the invention. In this case, as the recording paper, a web 2 fed from a roll 1 is shown, which web is abraded at position 3 by a laser beam. Therefore, the laser light source 4
Is modulated by the pulse modulator 5 from the electronic storage device 6. The row modulator 7 controls the laser beam into individual lines that cover the web. The moisturizing roller 8 moisturizes the paper at the moisture absorbing portion, and the ink roller 9 applies the ink to the non-moisture absorbing portion. The laser light source 4 can be replaced with an anode source or an ultrasonic source by modifying the modulators 5 and 7 accordingly.

FIG. 2 shows a perspective view of such an image recording machine. The recording paper is taken out from the roll 10, reaches the turning roller 12,
Roller 14 via cutting cylinder 13 and cutting device 15 shown schematically
Be led to. After that, the cut paper is shaken onto the deposit 16. The rollers 12 and 14 and the pressure cylinder 13 are driven by a motor, at which time the circumferential speed of both rollers coincides with the circumferential speed of the pressure cylinder 13, so that the recording paper is
Make a tense contact with. When the recording paper does not have the properties required for image recording, that is, water repellency or water absorption, the covering device 11 gives the recording paper the necessary surface texture. In this case, the irradiation of the recording paper is carried out by means of a laser beam 17 via a lightness modulator 18 and a row modulator 19, which in this example are arranged side by side in order to increase the working time.
Since it is divided into 5 points, 5 lines are recorded at the same time. The electronic control unit causes the laser beam to be entrained at the speed of the paper. The moisturizer present in the container 20 is the roller 2
1 leads to the leveling rollers 22, 23 and thus moistens the application roller 24. At the same time, ink is supplied from the ink container 25 to the application roller 24 by the roller 26 and the leveling rollers 27 and 28. This ink is emulsified with a moisturizer, and the recording paper absorbs only the moisturizer or only the ink depending on the surface properties. All rollers are driven separately to control the amount of moisturizer and ink. Since the reading speed of the pulse to the modulator 18 by the computer 30 depends on the circumferential speed of the pressure cylinder 13, that is, the paper transport speed, the start-up of the entire apparatus is guaranteed and printing is performed at various final speeds. You can also A drying device 29 can still be provided between the transport rollers 14 and the cutting device 15.

[Brief description of drawings]

FIG. 1 is a schematic view of an apparatus according to the present invention, and FIG. 2 is a perspective view schematically showing the structure of an image recording machine. 1, 10 ... Paper roller, 2 ... Paper, 4 ... Laser light source, 5
... pulse modulator, 6 ... electronic storage device, 7 ... row modulator, 8
... moisturizing roller, 9 ... ink roller, 12 ... turning roller,
13 ... Pressure cylinder, 17 ... Laser beam, 18 ... Lightness modulator, 19 ... Line modulator, 20 ... Hygroscopic agent container, 22, 23,
27, 28 ... Leveling roller, 24 ... Wearing roller, 25 ...
Ink container, 29 ... Drying device, 30 ... Computer.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-51-63704 (JP, A) JP-A-52-12006 (JP, A) JP-A-51-74706 (JP, A) JP-A-50- 102403 (JP, A) JP 38-8624 (JP, B1) JP 48-12248 (JP, B1) JP 41-17333 (JP, B1)

Claims (2)

[Claims] 1. A laser beam or an anode wire is applied to the recording surface of a recording material which is water repellent and becomes absorbent of moisture by irradiation, or which is absorbent absorbent and is made to be moisture repellent by irradiation. And irradiating radiant energy selected from the group consisting of an ultrasonic source while controlling it according to the image recording information, and then applying a moisturizer and a repellent to the moisturizing agent to the printing surface of the irradiated recording surface. A method for recording an image, comprising a step of supplying a hydrophobic hydrophobic ink. 2. An apparatus for continuously moving an object to be recorded, an apparatus for controlling a laser beam according to image recording information to irradiate the recording surface of the object to be moved and irradiating it with a laser beam. The recording surface of the recording material after being treated is composed of a moisturizing agent and a roller for applying a moisturizing agent-repellent hydrophobic ink. In fact, an image recorder that records an image on the recording surface of a recording material that is absorbent of a moisturizer and is changed into moisture repellent by irradiation.