SU673967A1 - Intaglio printing photopolymeric plate manufacturing method - Google Patents

Description

(54) METHOD OF MANUFACTURING PHOTOPOLYMERIC FORMS OF THE DEEP PRESS

The scheme for implementing the method consists of a plate cylinder 1, a layer of photopolymerizable material 2, a positive raster 3, a tone negative 4, a transparent polymer film 5, an actinic radiation source 6, recessed picture elements 7 and raster lines 8.

The method is carried out as follows.

A layer of photopolymerizable material is applied to the plate cylinder in various ways, for example, by applying a photosensitive material directly to the plate cylinder or by gluing a previously formed film of photopolymerizable material onto the cylinder.

As radiation sources, for example, slit light sources are used, giving a narrow, normally incident stream of light parallel to the generator of the plate cylinder.

The heat treatment is carried out at a temperature greater than the glass transition temperature of the uncured photopolymerizable layer, but less than its pour point, usually at 60-150 ° C. The duration of heat treatment, depending on the type of photopolymerizable material, temperature and thickness of the layer ranges from 5 to 120 minutes. Example 1

Prepare a solution of photopolymerizable material of the following composition:

Cellulose Acetosuccinate 193.0

Triethylene glycol dimes- 38, b

acrylate

Glycidyl methacrylate19.3

Ethoxylated heptyl alcohol38,6

oL-Chlorantraquinone 0.029

A solution of triethylamine in acetone6, 0

Acetone-alcohol mixture (85:

: 15) 1200.0ml

A 0.4 mm thick film is cast from the material solution on a Trommel. The cast film is glued to the substrate (steel sheet) with polyurethane glue.

On the photopolymer plate thus obtained, they copy a combined image of a positive raster with a lineature of 70 LIN / CM and a tone negative containing a model halftone density scale. Tight contact between the photoforms and the photopolymerizable layer is achieved by using a transparent polymer film pressed by vacuum. LUF-80 fluorescent lamps equipped with a slatted screen are used as the source of actinic radiation. The distance from the radiation source to the photopolymer plate is 600 mm. Copy a photographic image for 3 hours.

then the copy is heated in a heat chamber at 70-80 ° C for 60 minutes. Example 2

A model steel cylinder with a diameter of 130 mm is installed in the centers of the device for applying layers of material to the surface of the cylinder. The device includes a thinning die, with which a layer of material prepared according to example 1 is applied to the cylinder while the latter is rotating at a speed of t / 5 rpm. Thickness of a layer 40-50 microns applied in one revolution. The thickness of the dried photopolymerizable layer is adjusted to 0.4 mm, after which a combined image of a positive raster with a linagura 70 LIN / CM and a tone negative containing a model halftone density scale is copied onto it. Tight contact between the photoforms and the photopolymerizable layer is achieved by using a transparent polymer film pressed by vacuum. Copying is carried out using a PRK-7 mercury-quartz lamp, equipped with a parabolic m reflector and a slit diaphragm parallel to the generator of the cylinder. It is copied for 25 minutes, after which it is heated in a heat chamber at 90-100 ° C for 30 minutes. Example 3

The film cast in example 1 is glued to a model cylinder with polyurethane adhesive. Further operations are carried out according to example 2. Example 4.

A photopolymer plate is prepared according to example 1. The illuminated image of a positive raster and a tone negative is mounted on the last one and placed at a distance of 600 mm from the panel of radiators LUF-80, as described in example 1. With the help of heaters, the plate is heated to PO-120 ° C and copy the image for 20 mic, maintaining the above temperature.

The gradation characteristics of the forms obtained in Examples 1-4 correspond to those shown in FIG. 3 and 4.

The use of the method simplifies the process of making intaglio printing plates by reducing the number of manufacturing operations, eliminates the solvent-forming operation, and expands the range of photopolymerizable materials by using materials that do not appear in the available solvents.

Claims (3)

1. A method of making photopolymer intaglio forms, in which a photographic image of an intaglio form is copied onto a layer of photopolymerizable material with cellulose acetosuccinate, triethylene glycol dimethacrylate, ethoxylated heptyl alcohol, photoinitiator, and amine in a solvent, and the treatment is done with to simplify the process, in it a combined photographic image of a positive raster and a tone negative is copied onto the layer of the photopolymerizing material, and The treatment is carried out in a heat chamber at 60-150 ° C for 5-120 minutes. 2. A method according to claim 1, characterized in that the processing is carried out simultaneously with the copying. 3. The method according to claim 1, characterized in that the processing is carried out after copying. Sources of information taken into account in the examination 1. N. Sinkov. Technologists of manufacturing photomechanical printing plates. M., 1974, p. 53. 2. USSR author's certificate number 540247, cl. G 03 C 1/68, 1976. SO 25 ° o, og, f 0.8 / g JJHK orr S, 4H In fie. Z sri.Z