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Short inking unit

A technology of ink and coating roller, which is applied in the direction of lithographic rotary printing machine, printing, printing machine, etc., can solve the problems that it is difficult to form ink/wetting solution emulsion, affect production cost, and difficult to change the mode, so as to affect ink consumption and avoid Ghosting, highly uniform effect

Inactive Publication Date: 2009-12-23
MANROLANAD AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there is only one applicator roll, the number of nips is very small, making it difficult to form a stable ink / dampening solution emulsion
Another drawback of the known arrangement is that it is difficult to change the pattern due to the diameter of the applicator roller being related to the diameter of the plate cylinder
In addition, cylinders require very hard roll covers, adversely affecting production costs

Method used

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Examples

Experimental program
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Embodiment Construction

[0017] The main field of application of the invention lies in lithographic printing units for indirect or direct lithography, in the form of offset printing units for indirect or direct offset printing. The basic structure and method of operation of a printing unit of this type are known per se and therefore no further explanation is required here.

[0018] Figure 1-4 The offset printing unit shown comprises a printing cylinder 1 , a transfer cylinder 2 and an impression cylinder 3 . The printed material web 12 passes between the transfer cylinder 2 and the embossing cylinder 3 . In the case of wet offset printing, ink and dampening solution are applied to the printing form cylinder 1 . The inking unit 4 is arranged to supply ink. A wetting unit (not shown in more detail) may be arranged to supply a wetting solution. Wetting unit is omitted in case of waterless offset printing.

[0019] The inking unit 4 is configured as a short inking unit. It comprises a plurality of ...

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Abstract

Short inking unit for lithographic printing units, with applicator roller arrangement interacting with plate cylinder (1) and corresponding to engraved roller arrangement, each engraved roller (7, 8) of the engraved roller arrangement enables ink application On top of and interacting with at least one doctor blade, the applicator roller arrangement has a plurality of applicator rollers ( 5, 6), and the engraved roller configuration has a plurality of engraved rollers (7, 8) that are mutually offset in the direction of rotation of the printing plate cylinder (1) and form a roll train together with the applicator rollers (5, 6), Applicator rollers have rollers that roll in pairs and each define a nip point, all rollers of the roller train have a small diameter relative to the printing plate cylinder (1), engraving rollers (7, 8) and applicator rollers in each case (5, 6) Interacting at the respective nip points of the roll train and at least one end of the roll train being formed by an engraved roll interacting only with the applicator roll.

Description

technical field [0001] The invention relates to a short inking unit for a lithographic printing unit, in particular for an offset printing unit, having applicator rollers interacting with the plate cylinder and corresponding to engraved roller arrangements, each of which An engraved roller has ink applied thereon and interacts with at least one doctor blade. Background technique [0002] In known short inking units of this type, the applicator roller has a diameter corresponding to the diameter of the printing plate cylinder. Although this diameter uniformity avoids a phenomenon known as ghosting on the printed material, an applicator roll having the same dimensions as the plate cylinder typically requires a very rarely large amount of space within the printing press. For this reason, the known short inking units likewise generally only comprise one applicator roller. For reasons of space, it is not possible to use several applicator rollers here. Due to the large diamete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41F7/02B41F7/20B41F31/04B41F31/02
CPCB41F31/027
Inventor R·康拉德
Owner MANROLANAD AG
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