DE4105952C2 - Device for the aftertreatment of printed sheets coated inline - Google Patents

Description

The invention relates to a device for the aftertreatment of sheets coated inline by means of a Ka Landrierwerkes, the calendering unit as the last unit within a printing press is arranged and from a pressure cylinder, which a calendering cylinder with a clamped is assigned to the smoothing plate. Furthermore, the invention relates to a calender, the a device for supplying a release agent to the calendering cylinder is assigned.

Convertible dampening systems are used to coat printed sheets in sheetfed offset printing machines. Paint shops and separate paint shops (paint towers) used. These facilities he possible full-surface painting and the partial painting of printed sheets, so probably with one of the two facilities as well as with both facilities in a row.

To improve the quality of the printed product and especially the abrasion To improve the properties, the printed sheets are varnished several times inline. However, be due to the surface roughness of the paint, the gloss of the product is limited.

JP 60-52340 (A2) therefore describes a device for improving the gloss of lacquered prints Paper products have been proposed in which a calendering unit is installed inside the printing press is arranged as the last unit before the delivery. The calender consists of one Printing cylinder to which several calendering cylinders are assigned.

This solution has the disadvantage that despite the drying roller connected upstream of this device smearing of the printing ink on the calendering cylinder can hardly be prevented.

The object of the invention is therefore to provide a device for aftertreatment inline to create varnished printed sheets, by which a gloss-improved smoothing within the Printing machine is achieved in which the smearing of the printing ink can be avoided.

The task is solved by the features of the 1st and 3rd claim.

The invention is based on an embodiment example will be explained in more detail.

In the accompanying drawing:

Fig. 1: schematic representation of a printing machine with separate coating device and calender

Fig. 2: Representation according to Fig. 1 with the Kalier drierwerk converted Lackiereinrich device

Fig. 1 shows the last three units of a multi-color ben sheet-fed rotary printing press, consisting of convertible printing-coating unit 1 , separate coating unit 2 and calendering unit 3 . These individual units are connected via the Druckzy cylinder 4 and the transfer drums 5 to each other, up to the delivery.

The schematically illustrated inking unit 6 and the convertible wet coating unit 7 are in physical contact via the plate cylinder 8 and the rubber cylinder 9 with the printing cylinder 4 of the printing coating unit 1 .

The printing cylinder 4 of the coating unit 2 is a coating cylinder 10 downstream on which a coating roller 11 , a scoop roller 12 and a metering roller 13 can be adjusted.

Well-known dryers 14 are employed in each case in the running nip between the pressure cylinder 4 and the blanket cylinder 9 and the coating form cylinder 10 .

A calendering unit 3 consisting of pressure cylinder 4 and calendering cylinder 15 is arranged downstream of the two units 1 and 2 .

On the calendering cylinder 15 is a smoothing plate 16 with a very smooth surface such. B. chrome.

In addition, the smoothing plate 16 is coated with a varnish-resistant layer in order to keep the risk of lacquer tearing as low as possible, even if the lacquer is not completely dry.

In front of the inlet zone of the pressure cylinder 4 - calendering cylinder 15 , spray nozzles 17 are additionally arranged in order to be able to spray the smoothing plate 16, if necessary, with release agent, which has an oleophilic character and volatilizes without residue. With this measure, sticking of the lacquer layer to the smoothing plate 16 is to be avoided.

With these additional calendering unit 3 , the highest quality requirements in terms of the finished surface of the printed product are met within one machine run, since the coating layer is smoothed in this unit by pressure pressing and the gloss effect is thus achieved.

Deriving from this machine configuration with double coating capability, that is resettable pressure-coating unit 1 and downstream coating unit 2 is also Mög friendliness, as shown in FIG. 2 for calendering to use, in which the paint applicator roll 11 moved away from the coating form cylinders 10 and this as Kalan the downstream coating unit 2 three cylinder 15 is used.

Furthermore, there is the possibility of applying the coating roller 11 even during calendering to the coating cylinder 15 and, starting from the scoop roller 12 , to transfer oleophilic release agent to the calendaring cylinder 15 , in order to prevent the sheet from sticking. In this case, the spray nozzles 17 can of course be omitted.

This has made it possible within a machine through the print sheet in multi-color printing print, paint one or two times and by Kalan drieren to smooth out so that a surface finishing is achieved, the highest quality standards are sufficient.  

REFERENCE NUMBERS

1

Pressure coating unit

2

Painting works

3

Kalandrierwerk

4

pressure cylinder

5

Transfer drum

6

inking

7

Wet coating unit

8th

plate cylinder

9

rubber cylinder

10

Coating form cylinder

11

Lacquer application roller

12

scoop roller

13

metering

14

dryer

15

calendering

16

smoothing plate

17

spray nozzles

Claims (3)

1. Device for the after-treatment of in-line coated sheets by means of a calendering unit, the calendering unit ( 3 ) being the last unit within a printing press and consisting of a printing cylinder ( 4 ) to which a calendering cylinder ( 15 ) with a tensioned smoothing plate ( 16 ) is assigned , characterized in that the smoothing plate ( 16 ) has a lacquer-repellent layer or that printing cylinders ( 4 ) / calendering cylinders ( 15 ) for supplying an oleophilic release agent to the smoothing plate ( 16 ) are provided with spray nozzles ( 17 ) in front of the incoming nip. 2. Device for the after-treatment of inline painted sheets according to claim 1, characterized ge indicates that the smoothing roller is provided with a chrome layer. 3. Device for the aftertreatment of in-line coated sheets by means of a calendering unit, the calendering unit ( 3 ) being the last unit within a printing press and consisting of a printing cylinder ( 4 ) to which a calendering cylinder ( 15 ) is assigned, characterized in that as calendering cylinder (15) of the printing press, the varnishing is used the Lackformzylin of (10) of the coating unit (2) and that the factory (2) of the printing machine, consisting of lacquer application roller (11), suction roll (12) and metering roller (13) for transmission of the oleophilic release agent is used on the calendering cylinder ( 15 ).