DE2152447A1 - Making printing transfer roll - for flexoprinting of wallpaper - Google Patents

Abstract

Method of making a rubber grating-surfaced roll, for transferring ink or dye from a pickup roll to the printing roll of a wallpaper printing machine is as follows: a steel "negative" roll is first engraved mechanically or photographically with the negative of the desired grating pattern; the rubber sleeve intended for facing the grating-surfaced roll is then vulcanised upon the surface of this roll, so that it receives the pattern on its internal surface. This rubber sleeve is then accurately machined smooth on its external surface, turned inside out and removed from the negative roll and fitted onto the transfer roll.

Description

WALTER WETZEL KG
Printing roller factory

7889 Grenzach ΟΙζΟ / / 7

St. 19

Regarding the application for a patent dated 19. 10V 71

Subject of the invention:

"Anilox roller made of rubber or plastics

for use in flexographic printing
the wallpaper industry
Production method"

description
Paragraph I.

In the field of wallpaper printing, flexographic printing machines have been used for some time. Its peculiarity is with such Machines the type of printing unit structure and the printing process.

In the previous application principle (Fig. 1), a rubber roller (2) with a smooth surface dips into the ink tray (1) and transfers the ink to a metal anilox roller (3)> whose outer surface consists of a multitude of small, closely spaced depressions . The size of these recesses called raster can be kept so that ζ.Bsp. twenty such grid points come to a centimeter in length. Anilox rollers of this type are produced in the conventional manner by photo-engraving or by machine by moletting. The aforementioned anilox roller (3) takes over from the smooth surface of the rubber roller (2) printing ink, which sticks in the grid depressions while superfluous ink (2a) runs back into the ink tray. There is also the transfer from the screen roller (3) to the printing roller (4), the surface of which is made of rubber and is also the printing cliché. The printing ink transferred from (3) settles as a uniform point-like distribution on the printing formes from (4). The nature of the composition of the inks used in flexographic printing causes an immediate Zusämmenflies- sen this individually applied color points to a uniform coat of paint with which the paper web (5) is printed. A roller made of steel (6) with a smooth outer surface acts as an impression cylinder.

Approach II

With a new roller arrangement in the already described printing

309817/0523

W.WETZEL KG Druckwalzenfabrik 7889 Grenzach. Rheinfelder Str. 19 Application for a patent from 19.1C..71
"Anilox roller made of rubber"

2152U7

Werk (Fig.1) has the aforementioned anilox roller (3) no longer a screened one Jacket surface made of metal, but one made of rubber in a special one Process produced grid jacket, which is drawn on the actual roller body. By. Use of such Roller (3) with rubber grid, a metal roller can be used as a pressure roller (4). The technical advantage achieved in this way allows the use of printing rollers made of metal, the production of which is cheaper and the wear and tear of the printing contours of the previous the rubber rollers used. With such a printing unit structure, it is only necessary to use the smooth steel one Replace the counter-pressure roller (6) with a rubber roller with a smooth outer surface as well.

Paragraph III "Manufacturing process of the rubber anilox roller"

A steel roller body with a smooth surface (Fig.2) (7) is on its outer surface by photo engraving or by machine by moletting with the negative of the grid engraving of the appropriate size Mistake. By vulcanizing a endless rubber jacket (8) a tubular body is created which bears an exact, but deepened image of the grid engraving of the steel jacket on its inside * This rubber jacket is precisely ground by machine, still adhering to the steel cylinder and then pulled off the cylinder body by strapping around so that the one previously on the inside The grid is now on the outside of the removed hose (9). This hose is then placed on a prefabricated roller body appropriate dimensions drawn up and trimmed at the roller ends (10). The roller body used as a vulcanizing mold its negative raster is used to produce even more tube bodies used.

Claims (4)

Claims 1) Printing process according to paragraph II / flE as well as production of the rubber anilox roller, can also be used as a pressure roller. 2) Manufacture of the anilox roller according to the designs III / 1), however so that it is vulcanized on as a pressure carrier or printing form carrier Rubber is used. 309817/0523 W.WETZEL KG Druckwalzenfabrik 7889 Grenzach Rheinfelder Str. Application for patent grant vcm 19. 10. 71 "Anilox roller made of rubber" 3) Manufacture of the anilox roller according to III, 1), 2), but as follows, that plastic plastics, which are used by their chemical composition, however, cannot be called rubber. 4) Production of the anilox roller according to III, 1), 2), 3) but as follows, that instead of peeling off with simultaneous folding over of the hose body, the applied or vulcanized jacket of rubber or plastics by cutting BEZW. Cut open parallel to the roller body axis and open as a cylinder development is withdrawn in order to be wound up on a roller body of the required design and dimensions. 309817/0523 Blank page