DE898913C - Elastic multilayer printing form - Google Patents

Description

There are multi-layer elastic pressure forming, known in Kautschuianischuingen. Which and a substantially thicker a ¹ thin hard printing layer underlying, softer and more resilient cushioning layer and at the bottom have a rubber sealing layer ;, which is used for fastening the printing plate on the printing plate or roller of the printing press. Several such relatively soft intermediate layers can also be used on the stiffness of a cushioning layer. It is also known between! Embed or vulcanize individual layers or several layers of shrink-proof material, such as fibers, paper, cardboard, fabric or the like, impregnated with synthetic resin or other substances, in order to ensure the dimensional accuracy of the printing form. One such printing form, which forms a layered body, is expediently formed by vulcanizing the individual layers together.

It has now been shown that it is useful to choose between the various main layers which a printing form of this kind was built up, still sent special help or communication to switch on, which in the course of vulcanization creates an evenly firm connection between the individual Layers effect, but also the unvulcanized ones Layers of the printing form to be formed are able to stick together. Turn according to the invention such connecting layers in at least three Places, namely i. between the print size and

■ the cushioning layer, between the second pad and the chicht shrink resist Einliagie and 3. ¹ between the liner and .sohirampffesiten (the nächstfolgieinidien layer ajnigieortdnet. The Vetfbindunigsschichten be seated, only a very small thickness from fractions of a millimeter eiinas, z. B Between 0.0a and 0.3: mim. When building such a printing form in the Sänne of the invention according to patent 857 055, it is below the scratch-resistant layer or, if there are several such inserts, at least below the lowest shrink-proof insert a compensating layer arranged, which eliminates the roughing of the printing form as a result of its opposite tendency to shrink. Furthermore, the printing form is expediently closed on the side opposite the printing surface by a fabric, which prevents vulcanization (sticking) on the cover of the vulcanization phone and prevents the enclosed ones from escaping Air allows.

One according to a preferred embodiment of the invention therefore at M.k use a bucket compensation layer at least from the following target densities; the vulcanization must be loosely aligned with each other can represent an inseparable unit or even in the raw state ■:

i. Dxueksehicht (0.2 to 0.8mm), 2nd connecting layer (0.01 to 0.3 mm), 3rd polar layer (o, 6 up to 4 mm), 4th connecting layer (0.01 to 0.3 mm), 5th shrink-proof insert (0.4 to 1 mm), 6th connecting layer (0.01 to 0.3 x mm), 7th leveling layer (0.5 to 2 mm), 8. tissue backing.

The most favorable thickness of all ziusaimimenigebauten Layers! is not less than 3 and not more than 5 mm. The thickness> of the pressure layer and its Hardness as well as the thickness of the pressure layer and the Thickness of the padding layer as well as the hardness of the printing layer and the hardness of the padding layer should preferably be in certain relationships to one another. Printing forms in which the Relationships of these factors' regulated: siiaid, form . the subject of patent 814009.

The structure of a printing form according to the invention is shown in the drawing, for example, where in

FIG. 1 shows the section through a raw plate for producing a printing form according to the invention, in FIG. 2 the printing form is shown clamped on a cylinder.

In Figs. 1 and 2, 1 is the printing layer, with 3 the upholstery layer, with 5 the shrink-proof iSlin layer and with 7 one underneath, the shrink-proof Insert arranged, expediently as a base layer serving class. 8 means a tissue pad. The help and connection layers, which according to the invention Favoring and securing the union of the layers are marked with 2, 4 and 6. In Fdg \ 2 9 is also a pressure roller on which the printing form is clamped, whereas 10 is the base, on which the material to be printed, -how Paper, cardboard, etc., is laid on, means.

An example composition of the designated layers is the following: 65

a) Druckschdcht (1) '

100.0 parts by weight of a copolymer of

Butadiene with acrylonitrile, 70 5.0 - zinc tearate,

10.0 - triiphenyl phosphate, ΐο, οι - dibenzyl ether,

ι Ο ', οι - Zdnkoxyd,

60.01 - 'active soot, 75 6o, oi - inactive soot,

2.5 - sulfur,

2.0 - an implementation product -

of MerkaptobenzO'tihiiazöl and Diethylamine. 80

b) bonding layers (2, 4, 6)

50.0 'parts by weight of a copolymer of

Butadiene with acrylic acid nitrile, 50.0 - a copolymer of 85

Butadiene with styrene, 5.0 - kumarari resin,

5.0 - rosin rubber oil

(Lignite tar extract) {1: 1), 5.0 - mineral oil, 90

10.0 - zinc oxide,

40.0 - active soot,

40.0 - inactive soot,

2.0 - sulfur,

2.0 - a product of implementation 95

of mercaptobenzotihiazole and diethylamine.

c) padding layer (3)

100.0 parts of a copolymer of 100

- ■ _. ... butadiene with styrene,

.510.0 - mineral oil,

25.0 - zinc oxide,

5.0 .. - semi-active soot,

20.0 - factice, 105

200.0 - chalk,

2.5 - sulfur,

2.0 - of a conversion product

of Merkiaptobenzothiazole and Diethylamini. 110

d) i leveling layer (7)

idd, oi parts by weight of a mixed polymerizate. from

Butadiene with styrene,

ido, o-giemahliene waste, 115

3> o ■ - stearic acid,

10.0 - mineral oil,

5o; o - Fiaktis,

30.0 - zinc oxide,

100.0 - semi-active carbon black, 120

200.0 - regrind,

350.0 - chalk,

5.0 - sulfur,

5.0 - a usage product

of Merkaptobenizo'thiazole and 125 diethyliamine,

According to the invention apply those described Druekformischticfoten together in loose or already connected layers in one single vulcanization process to form a unitary, inseparable body.

Claims (4)

Patent claims: 1. Elastic multilayer printing form made from ίο Kaiutschuk mixes with a thin hard one Pressure layer, at least one underlying soft, elastic padding and at least one shrink-proof insert, thereby characterized in that at least three places, namely between the idler print layer and the Padding layer, between the padding layer and the shrink-proof insert and between the Schiruimpfesteinlage and the next one Layer, connecting layers are arranged, which connect these layers 'cause each other. 2. Elastic multilayer printing form according to claim 1, characterized in that it aius consists of at least the following layers, namely from a print sheet (1) (e.g. from 0.2 to 0.8 mm plank), a connecting layer (2) (e.g. from 0.101 to 0.3 mm thick) between the printing layer and the cushioning layer, a cushioning layer (3) (e.g. from 0.6 to 41mm thick), another connecting layer (4) (e.g. from 0.01 to 0.3 mm thickness) between the poista layer and the bucket of shredded walls lEiinlage, a shrink-proof insert (5) (e.g. from; 0.4 to ι mm thickness), another Venbindmngisisehihts (6) (e.g. from ο, οί up to 0.3 mm thick) between the insert that is resistant to the trunk and a leveling layer, a leveling layer (7) (e.g. from 0.5 to 2 mim) and possibly a fabric underlay (8). 3. Elastic multi-layer printing form according to Claim 2, characterized in that the total thickness of the printing forme is between 3 and S mm. 4. A method for producing a printing forme according to Claims 1 to 3, characterized in that 'that all printing forme layers together in loose or connected layers, - • differently'chichitiuing in a single vulcanization process molded into a unified, inseparable body. 1 sheet of drawings 5637 11th S3