JPS61162352A - Manufacture of rubber printing block - Google Patents

Abstract

PURPOSE:To prevent generation of a notch part at the foot of a protruded pattern part, by a method wherein in relation to a rubber printing block to be used for printing on a thick and elastic component after a foil has been attached to the outside of a rubber base at a predetermined pattern and arrangement and after application of water jet to the whole area, the foil is removed. CONSTITUTION:After a foil 8, which is harder than a rubber base and is superior in wear resistance, has been molded into a predetermined letter and symbol, the same is attached to a rubber base 1 at a predetermined arrangement. Then after application of water jet 10 to the whole area of the surface of the rubber base 1, to which the pattern foil has been attached, the pattern foil is peeled and removed. In addition to the above, finish is performed by attaching the rubber base, which has been printed, to a predetermined base roll 4. In consequence of the above, a notch part to be generated through manual engraving does not occur, the surface of the pattern becomes a curved surface running along a roll curvature and finish printing becomes favorable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing a rubber printing plate used for printing thick and elastic members such as cardboard and felt.

Prior Art Conventionally, a craftsman used a chisel to carve out a rubber segment for a printing plate as shown in FIG. As shown in FIG. 6, a notch 3' inevitably occurs at the base of the pattern protrusion 2', and when the roll 4' is wrapped and bonded, the notch 3' opens as shown in FIG. This becomes an opening 5'.

Therefore, the surface of the pattern protrusion does not become a curved surface along the roll, but remains flat, and the pattern surface and work surface do not come into uniform contact during rotary transfer, so the periphery of the printed character symbol is disordered. , a good finish could not be achieved, and the rate of print defects was high.

Means for solving the problem After attaching crystalline or amorphous alloy foil or resin foil, which is harder than the substrate material and has superior wear resistance, to the outer surface of the rubber substrate in a predetermined pattern and arrangement. After irradiating the entire surface with water jet, remove the pattern foil.

The operative waterjet removes the rubber substrate leaving the foil-covered pattern surface, thus creating a rubber printing plate without creating notches at the base of the pattern protrusions.

Embodiment 1 to 3 show a first embodiment in which the rubber substrate is a flat plate, 1 is a rubber substrate, 2 is a pattern protrusion such as a character or symbol, 4 is a roll, and 8 is a J-turn. Foil, 9 water jet gun or laser beam gun, 10
indicates a water jet or laser beam gun, and 11 indicates the trajectory of the gun.

(a) In the case of a water jet, the pattern foil 8 is a metal foil that is harder and more wear resistant than the rubber substrate (for example, Stellite foil, Ni-0r-Fe material, etc. I#IVc1 molten metal quenching method, etc.) (preferably an alloy foil made into an amorphous material) or a plastic foil plate (for example, Teflon, etc.).

If a laser beam is used, an aluminum foil is used that reflects most of the laser light.

(b) After molding the foil 8 into predetermined characters and symbols, it is attached to the rubber substrate 1 in a predetermined arrangement. Of course, the adhesive may be applied in advance to the back side of the foil in the form of an adhesive tape.

(c) Water jet (high pressure water jet) or
An abrasive water jet lO containing abrasive grains in water is applied to the rubber substrate surface to which the pattern foil is attached at a predetermined flow rate, water column diameter, gun transfer speed, and in the case of a laser beam, a predetermined energy, aperture rate, and scanning speed. After the entire surface is irradiated, the pattern foil is peeled off and removed.

(b) The printed rubber substrate is attached to a predetermined base roll 4 (transfer roll) for finishing.

FIG. 4 shows a second embodiment in which the rubber substrate is a cylinder, in which reference numeral 13 indicates a rubber cylinder (hollow 14 indicates a removed portion, and 15 indicates a curved surface).

(a) Fit the cylindrical rubber substrate to the rotating roll ratio.

(b) Attach pattern foil 8.

(c) The rubber portion other than the pattern foil is removed by a predetermined thickness by water jet 10 or laser beam irradiation.

) Pattern plate removal.

(e) Fit and insert into the base roll (transfer roll) (not shown).

In this embodiment, of course, a solid cylindrical rubber substrate may be used, and it can also be used as it is as a transfer roll.

Effects of the Invention There are no cuts caused by manual digging with a conventional chisel, and as a result, as shown in Fig. It becomes a surface,
The print finish is good.

When using a water jet, there is no deterioration of the rubber and the durability life is extended (no cracking), and there is no combustion vaporized gas generated during removal, resulting in a good working environment.

[Brief explanation of drawings]

Figure 1 shows the invention! FIG. 2 is a cross-sectional view of the pattern protrusion shown in FIG. 1, and FIG. 3 is a cross-sectional view of the rubber segment shown in FIG. 1 wound around a roll and bonded. It is a drawing. FIG. 4 is an explanatory diagram of a second embodiment of the present invention. Fig. 5 shows the J segment made by the conventional method, and Fig. 6 shows the cross section M of the (turn 22!) part of Fig. 5.
- Figure 7 is a drawing showing the cross-sectional shape of the rubber segment shown in Figure 5 wrapped around a roll and bonded. 1...Rubber substrate, 2...Pattern protrusion, 4...Roll, 8...Pattern foil, 10...Waterjet sub-agent Patent attorney Shige Okamoto Figure 3 Figure 4

Claims (1)

[Claims] Crystalline or amorphous alloy foil or resin foil, which is harder than the substrate material and has superior wear resistance, is attached to the outer surface of the rubber substrate in a predetermined pattern arrangement, and then the entire surface is irradiated with a water jet to form a rubber substrate. A method for manufacturing a rubber printing plate, characterized in that the foil is removed after a predetermined thickness of a substrate portion is removed.