DE10315869A1 - Printing unit for multicolor printing use for newspapers, has plate cylinders with peripheral litho-pressure plates and impression cylinders with peripheral flexible layers that enable direct transfer of ink to print material - Google Patents

Abstract

The printing unit includes plate cylinders (06) and impression cylinders (07). Each plate cylinder is provided with a peripheral litho-pressure plate and each impression cylinder is provided with a peripheral flexible layer to enable the direct transfer of ink to a print material (02).

Description

The The invention relates to a printing unit for two-sided printing Material web, according to the generic term of claim 1.

to execution a double-sided multi-color print, in particular a 4 + 4 print for newspapers, are a larger number of machine configurations. Such printing units for four-color printing of printing material webs in the type of combinations of several 4-cylinder systems, in the type of 8-cylinder systems, 9-cylinder systems or 10-cylinder systems be trained. It is common to all these systems that indirect Planographic printing processes are used, in which the on the printing plate included print image first transferred to a transfer cylinder covered with a rubber blanket from which it is then printed onto the printing material web.

From the DE 41 04 135 A1 a rotary rotary printing machine for double-sided multi-color printing is known. In this printing machine, four 4-cylinder systems are arranged one above the other and each form a printing unit. In each printing unit, two colors can then be printed on the printing material web. To increase the flexibility of the printing press, a printing unit, in particular the lowest printing unit, is designed in such a way that printing can be carried out in the so-called di-litho printing process. The di-litho printing process is a direct flat printing process in which printing is carried out directly from the printing plate, for example a zinc or aluminum plate, onto the printing material web. The use of the di-litho printing method in one of the printing units makes it possible to print the printing material web in this printing unit on one side with two colors, so that this results in a correspondingly higher flexibility of the entire printing machine.

The The invention is based on the object of a printing unit for two-sided printing To create printing on a substrate web.

The The object is achieved by the Features of claim 1 solved.

The Machine concept for Printing units is based on the basic idea of building a 4 + 4 printing unit by saving the transfer cylinders to simplify. This is achieved by one with one Blanket equipped impression cylinder is used on the several plate cylinders with di-litho printing plates can be used can. As a result, all four-color printing colors are then printed using the di-litho printing process. Here is for every single ink on each side of the web, e.g. B. to provide the printing material web with at least one plate cylinder with a di-litho printing plate, which results in a minimum number of eight plate cylinders.

In a preferred embodiment the invention is the printing unit in two modular printing units divided up. There are 4 plate cylinders in each of these printing units provided that cooperate with at least one impression cylinder. This structure enables the printing material web in each printing unit on one side with four To print colors.

For construction There are different options for the individual printing units. According to a first preferred embodiment, each printing unit has four plate cylinders, all of which are arranged centrally Back pressure cylinders can be turned on. The substrate web can then do that centrally when printing on one side with four colors arranged around the impression cylinder and is wrapped one after the other printed with four different colors in the four printing points.

To a second alternative embodiment each printing unit has four plate cylinders and two impression cylinders on. Each can 2 plate cylinders can be placed on an impression cylinder. When printing on the substrate with four colors in one printing unit the substrate will then be between the first two Plate cylinders and the first impression cylinders carried out and printed with the first two inks and then through the other two plate cylinders and the other impression cylinder carried out and there with the rest printed with both inks.

The Distribution of the printing inks on the various plate cylinders is in principle in the printing units any. However, a particularly good print image results when the order of the colors printed on the substrate web corresponds to each other in both printing units.

embodiment the invention are illustrated in the drawings and are in following closer described.

It demonstrate:

1 a first embodiment of a printing unit in schematic cross section;

2 a second embodiment of a printing unit in schematic cross section.

With the in 1 illustrated printing unit 01 can be a web of material 02 , e.g. B. a printing material web 02 , e.g. B. a paper web 02 printed on both sides with the four colors cyan C, magenta M, yellow Y and black B. The substrate web 02 for this purpose in the transport direction T by two printing units located one above the other 03 and 04 conveyed. From the printing units 03 and 04 and the printing unit 01 are in 1 only the parts shown that are necessary for understanding the invention.

In every printing unit 03 and 04 are 4 plate printing cylinders each 06 provided to a central impression cylinder 07 can be employed. On the plate cylinders 06 a di-litho printing plate, for example made of aluminum or zinc, is attached, which is a direct flat printing process for printing the printing image contained in the printing plate on the printing material web 02 enable. In order with the plate cylinders 06 The impression cylinder shows that it can work together in the di-litho printing process 07 an elastic layer on the circumference, for example a rubber blanket covering.

The dampening and inking units for supplying the plate cylinders 06 with sufficient dampening solution and color are in 1 and 2 not shown.

In the 1 described configuration enables the substrate web 02 in the printing unit 03 first to print on one side with the four colors cyan C, magenta M, yellow Y and black B and then the printing material web 02 in the printing unit 04 to be printed on the opposite side with the four colors cyan C, magenta M, yellow Y and black B. The order of the on both sides of the printing material web 02 printed colors correspond in the printing units 03 and 04 each other.

In 2 is a second embodiment of a printing unit 08 shown. At the printing unit 08 are also two printing units 09 and 11 for four-color printing on both sides of the substrate 02 intended. In every printing unit 09 and 11 are again four plate cylinders 12 arranged, on which di-litho printing plates are attached. Two plate cylinders each 12 can be attached to an impression cylinder covered with a rubber blanket 13 be turned on so that the printing material web 02 as a result, initially in the printing unit 09 on one side with the four colors cyan C, magenta M, yellow Y and black B and then in the printing unit 11 can be printed on the opposite side with the colors cyan C, magenta M, yellow Y and black B. Again, the order of the colors in the printing units corresponds 09 and 11 each other.

01

printing unit

02

Web, Printing material web, paper web

03

printing unit

04

printing unit

05

06

plate cylinder

07

Impression cylinder

08

printing unit

09

printing unit

10

11

printing unit

12

plate cylinder

13

Impression cylinder

B

black

C

cyan

M

magenta

Y

yellow

T

transport direction

Claims (7)

Printing unit ( 01 ; 08 ) for two-sided printing on a substrate ( 02 ), each with four colors (M; C; Y; B), with eight plate cylinders ( 06 ; 12 ) and at least two impression cylinders ( 07 ; 13 ), each plate cylinder ( 06 ; 12 ) when printing on the printing material web ( 02 ) on an impression cylinder ( 07 ; 13 ) can be used, characterized in that the impression cylinder ( 07 ; 13 ) have an elastic layer on the circumference and on the plate cylinders ( 06 ; 12 ) each a di-litho printing plate is attached, which transfers ink from the plate cylinders ( 06 . 12 ) directly on the substrate ( 02 ) enables. Printing unit according to claim 1, characterized in that the printing unit ( 01 ; 08 ) in two printing units arranged one above the other or next to each other ( 03 ; 04 ; 09 ; 11 ) is divided into four plate cylinders ( 06 ; 12 ) with at least one impression cylinder ( 07 ; 13 ) interact to form the substrate ( 02 ) in the printing units ( 03 ; 04 ; 09 ; 11 ) to be printed on one side with four colors (M; C; Y; B). Printing unit according to claim 2 , characterized in that each printing unit ( 03 ; 04 ) four plate cylinders ( 06 ), all of which are connected to a centrally arranged impression cylinder ( 07 ) can be employed. Printing unit according to claim 2, characterized in that each printing unit ( 09 ; 11 ) four plate cylinders ( 12 ) and two impression cylinders ( 13 ) on points, with two plate cylinders ( 12 ) to an impression cylinder ( 13 ) can be employed. Printing unit according to one of claims 1 to 4, characterized in that the order of the on the substrate web ( 02 ) printed colors (M; C; Y; B) in both printing units ( 03 ; 04 ; 09 ; 11 ) corresponds to each other. Printing unit according to one of claims 1 to 5, characterized in that the impression cylinders ( 07 ; 13 ) are each equipped with a rubber blanket to form the elastic layer. Printing unit according to one of claims 1 to 6, characterized in that the printing material web ( 02 ) in the printing unit ( 01 ; 08 ) can be printed on both sides with the colors cyan (C), magenta (M), yellow (Y) and black (B).