DE10315869B4 - Printing unit for two-sided direct printing on a substrate web - Google Patents

Abstract

printing unit (01, 08) for two-sided direct printing on a substrate web (02), each with four colors (M; C; Y; B), where the printing unit (01; 08) in two on top of each other or juxtaposed pressure units (03, 04, 09, 11) are divided is, in each of which four plate cylinders, each with at least a counter-pressure cylinder designed as a satellite cylinder (07; 13) (07, 13) act together, wherein the printing material web (02) respectively one-sided between plate cylinder (06; 12) and satellite cylinder (07; 13) is printable, wherein in each case four plate cylinder (06; 12) the di-lithographic printing plates and the at least one satellite cylinder (07; 13) have an elastic layer on the circumference.

Description

The The invention relates to a printing unit for two-sided direct printing a printing material according to the features of claim 1.

to execution a two-sided multi-color printing, in particular a 4 + 4-pressure for newspapers, are a larger number known machine configurations. Such printing works for four-color printing of substrates can in the kind of combinations of several 4-cylinder systems, in kind 8-cylinder systems, 9-cylinder systems or 10-cylinder systems be educated. It is common to all these systems that indirect Planographic printing can be used, where the on the printing plate included print image first transferred to a covered with a blanket transfer cylinder is from which it is then printed on the substrate web.

From the DE 41 04 135 A1 is a rotary-type 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 then two colors can be printed on the substrate web. In order to increase the flexibility of the printing machine, a printing unit, in particular the lowermost printing unit, is designed in such a way that it can be printed in the so-called di-lithographic printing method. The di-litho printing process is a direct lithographic printing process in which the printing substrate is printed directly from the printing plate, for example a zinc or aluminum plate. The use of the di-lithographic printing method in one of the printing units makes it possible to print on the printing material web in this printing unit on one side with two colors, resulting in a correspondingly higher flexibility of the entire printing press.

The EP 0 710 558 A1 shows two 9-cylinder satellite offset printing units for double-sided four-color printing on a web.

The US 44 88 483 A discloses a direct printing satellite printing unit wherein a web is printed between four plate cylinders and a satellite cylinder.

The DD 263 498 A5 describes a printing unit, wherein the impression cylinder depending on the pressure plate optionally has a hard or soft elevator.

From the DE 101 05 926 A1 It is known to print a substrate web on both sides with four colors each. It is unclear to which cylinder it is, the transfer cylinders are called optional.

The DE 462 357 A shows in 2 a one-sided four-color print.

Of the Invention is based on the object, a simple printing unit for create two-sided direct printing of a substrate web.

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

The Machine concept for Printing works is based on the idea, the structure of a 4 + 4-printing unit by saving the transfer cylinder to simplify. This is achieved by having one with a Rubber blanket equipped impression cylinder is used on the several plate cylinders are employed with di-lithographic printing plates can. As a result, all colors of the four-color printing are then printed in the di-litho printing process. It is for each individual ink on each side of the web, z. B. provide the printing material web with at least one plate cylinder with a di-lithographic printing plate, resulting in a minimum of eight plate cylinders.

The Printing unit is divided into two modular printing units. Each of these printing units has 4 plate cylinders each, which cooperate with at least one impression cylinder. By this structure will allow the substrate web in each printing unit on one side with four To print colors.

For the construction The individual printing units have different possibilities. According to a first preferred embodiment, each printing unit Four plate cylinders on, all at a centrally located Counter-pressure cylinder can be employed. The printing material web can be the one-sided printing with four colors then the central arranged around counter-pressure cylinder and is successively printed in four different colors with four different colors.

According to a second alternative embodiment, each printing unit has four plate cylinders and two impression cylinders. In each case 2 plate cylinders can be employed on a counter-pressure cylinder. When printing the printing substrate with four colors in a printing unit, the substrate web is then first performed between the first two plate cylinders and the first impression cylinder and thereby with the printed first two inks and then performed between the other two plate cylinders and the other impression cylinder and printed there with the other two inks.

The Distribution of the printing inks on the various plate cylinders in the printing units is basically any. A particularly good print image, however, arises when the order of the colors printed on the substrate 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 a schematic cross section;

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

With the in 1 illustrated printing unit 01 can a material web 02 , z. B. a printing material web 02 , z. B. a paper web 02 be printed on both sides with the four colors Cyan C, Magenta M, Yellow Y and Black B. The printing material web 02 is in the transport direction T by two superimposed pressure units 03 and 04 conveyed. From the printing units 03 and 04 and the printing unit 01 are in there 1 only the parts that are necessary for understanding the invention.

In every printing unit 03 and 04 are each 4 plate printing cylinder 06 provided to a central impression cylinder 07 can be hired. At the plate cylinders 06 In each case, a di-lithographic printing plate, for example made of aluminum or zinc, attached, which is a direct planographic printing process for printing the printed image contained in the printing plate on the substrate web 02 enable. To deal with the plate cylinders 06 to cooperate in the di-lithographic printing process, the impression cylinder has 07 on the circumference of an elastic layer, for example, a rubber blanket covering on.

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

In the 1 described configuration allows the substrate web 02 in the printing unit 03 To print first on one side with the four colors Cyan C, Magenta M, Yellow Y and Black B and then the substrate web 02 in the printing unit 04 on the opposite side with the four colors Cyan C, Magenta M, Yellow Y and Black B to print. The order of the two sides of the printing substrate 02 imprinted colors corresponds to 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 web 02 intended. In every printing unit 09 and 11 again four plate cylinders each 12 arranged on which di-lithographic printing plates are attached. Two plate cylinders each 12 can thereby to a covered with a blanket impression cylinder 13 be hired so that the substrate web 02 as a result, first 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 on the opposite side can be printed with the colors Cyan C, Magenta M, Yellow Y and Black B. Again, the order of the colors in the printing units is the same 09 and 11 each other.

01

printing unit

02

Web, Substrate 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 (5)

Printing unit ( 01 ; 08 ) for two-sided direct printing of a substrate web ( 02 ), each with four colors (M; C; Y; B), whereby the printing unit ( 01 ; 08 ) in two superimposed or juxtaposed printing units ( 03 ; 04 ; 09 ; 11 ) is divided, in each of which four plate cylinder, each with at least one as a satellite cylinder ( 07 ; 13 ) formed impression cylinder ( 07 ; 13 ) together, the printing material web ( 02 each one tig between plate cylinder ( 06 ; 12 ) and satellite cylinders ( 07 ; 13 ) is printable, wherein in each case four plate cylinder ( 06 ; 12 ) the di-lithographic printing plates and the at least one satellite cylinder ( 07 ; 13 ) have an elastic layer on the circumference. Printing unit according to claim 1, characterized in that each printing unit ( 03 ; 04 ) four plate cylinders ( 06 ), all to a centrally located satellite cylinder ( 07 ) can be employed. Printing unit according to claim 1, characterized in that each printing unit ( 09 ; 11 ) four plate cylinders ( 12 ) and two satellite cylinders ( 13 ), wherein in each case two plate cylinders ( 12 ) to a satellite cylinder ( 13 ) can be employed. Printing unit according to claim 1, characterized in that the order of the on the printing material web ( 02 ) printed colors (M; C; Y; B) in both printing units ( 03 ; 04 ; 09 ; 11 ) corresponds to each other. Printing unit according to Claim 1, characterized in that the satellite cylinders ( 07 ; 13 ) are each equipped with a blanket to form the elastic layer.