DE102004007915B4 - Method and device for personalizing a double-sided printed and not yet dried web - Google Patents

Abstract

Printing machine for offset printing, with
- A printing unit (1) for printing on both sides of a web (6) which is transported in a direction of movement (7) through the machine,
- A dryer (2) for drying the printed web (6), and
- a labeling device (3) for product-specific labeling of the web (6),
characterized in that
the web (6) in the printing unit (1) is printed on both sides multicolored with printing ink, which must be subsequently dried, that the printed, still wet web (6) of the labeling device (3) is fed and labeled, in the area of the labeling device ( 3) a deflection device (8a-8c) is provided, by means of which the still wet web (6) is deflected without contact and positioned for labeling and stabilized, and the printed and labeled web is then fed to the dryer (2).

Description

The The invention relates to a printing machine for offset printing, according to the preamble of claim 1, and a method of printing a Web by means of a printing press according to the preamble of the claim 8th.

Printing machines, to which reference is made below, are for printing a web-shaped material, which is passed through the machine at high speed and thereby various processing steps, in particular printing, Drying, labeling (personalizing), etc. goes through. The Web is wound up on a reel after printing and either fed to a further processing device, which from the printed Sections of the web the actual printed products, such as Advertising leaflets or brochures, manufactures or the web is direct following the printing press, processed "inline" to form a printed product.

1 shows a typical example of a printing press, which works in the role-offset method and for printing on both sides of a paper web 6 is set up. The printing press essentially comprises a printing unit 1 for printing the paper web 6 , a dryer for drying the printed paper web 6 , a digital printing or labeling device 3 for personalizing individual sections of the paper web and another dryer 4 to dry the label.

During printing the web is running 6 at high speed in the direction of the arrow 7 through the printing machine, taking first of several pressure rollers 12a - 12d printed on both sides in multiple colors. The wet paper web 6 then gets in the dryer 2 led the printing press and dried there by means of hot air. On the way between printing unit 1 and labeling device 3 must the train 6 be carried freely, since the wet web 6 otherwise it would rub off. After the dryer 2 will be the train 6 by means of the printing device 3 personalized, ie provided with product-specific imprints, such as the name and address of the addressee, to whom the finished printed product should be sent later. The caption will eventually be in a second dryer 4 dried.

For the purpose of personalization, high-speed inkjet are commonly used. To ensure a clean pressure it is necessary that the paper web 6 maintains a small distance to the print head and does not flutter. For example, the distance of the web must not exceed a range between 0.5 mm and 1.5 mm. To meet this requirement, the paper web 6 by means of a pulley 5 located just under the printhead of the inkjet 3 is arranged, held in position and stabilized.

After personalizing, the labeled paper web needs 6 be dried again. There are therefore at least two dryers required to print a double-sided and personalized 6 manufacture. This is relatively complicated and expensive.

From the DE 25 01 793 02 For example, there is known a printing machine comprising a printing unit for printing a web transported in a direction of travel through the machine. The printing machine further comprises a labeling device for labeling the web, and a dryer for drying the label. The press works in newspaper printing, where it is not necessary to subsequently dry the ink.

From the DE 691 12 768 T2 For example, there is known a printing machine which also comprises a printing unit for printing on both sides of a web which is transported in a direction of movement through the machine. In front of the printing unit, a printer is arranged, which additionally prints the web in letterpress printing. A product-specific labeling is not provided here.

In the DE 31 04 656 02 discloses a deflection device with which a printed web can be deflected without contact.

It is therefore the object of the present invention, a printing press to simplify such that for the production of a double-sided printed and subsequently Labeled web only a single dryer is required.

Is solved this task according to the invention by the specified in claim 1 and in claim 8 Characteristics. Further embodiments of the invention are the subject of dependent claims.

One essential idea of the invention is a printing press to set up for printing a web such that the labeling device arranged in the transport direction of the web in front of the dryer of the printing unit is. Since the paper web is still wet at this point, she can not with conventional Deflectors are positioned and stabilized. It will therefore proposed to provide at the labeling device a deflection device, with the train contactless can be deflected and stabilized.

A preferred embodiment of the invention comprises a deflection device, which is designed such that on the surface, along the the web is running, forming an air cushion on which the web is carried without touching the surface. The web tension and the strength of the air pressure with which the deflection device is acted upon are adapted to one another in such a way that the web is carried on the surface of the deflection device without touching the surface.

The Bypass is preferably as an elongated element realized, which is arranged transversely to the direction of the web. Around to allow the formation of an air cushion is the outer wall a deflection device according to the invention preferably at least in a partial region over which the web slides, air-permeable formed.

The surface the deflection, over the the web slides, is preferably curved. The diverters are as well preferably arranged fixed. Thereby, e.g. in case of a Guide roller a superfluous air outlet at positions of the guide roller, over which the printing material is not guided is avoided, and an optimal air pressure within the deflection be generated. But it is also possible, the deflection to design as a rotating guide roller.

The said air cushion can e.g. by means of a multiplicity of fine openings (Air nozzle) be generated in the outer wall are arranged. The openings can be made for example by drilling or by laser. Alternatively could the surface also from a microporous Material, such as a microporous ceramic material be. Such a material has the particular advantage that a especially evenly distributed air cushion can be generated on which the web hovers without contact.

Of the Air pressure, with which the deflection device is acted upon, is preferably less than 5 bar and more than 2 bar. This one is dependent on Web width, web tension and web material texture and surface finish or procurement of the air outlet openings of the deflection device. The web tension with which the web is transported through the press becomes, amounts to the labeling device preferably between 30 Nm and 80 Nm, in particular between 50 Nm and 70 Nm.

The web to be printed can, in principle, be made of any material, especially paper or plastic.

The Invention will be exemplified below with reference to the accompanying drawings explained in more detail. It demonstrate:

1 a schematic view of a known from the prior art printing machine with two dryers;

2 a schematic representation of a printing machine according to an embodiment of the invention;

3 a deflection device with air outlet openings according to a first embodiment of the invention;

4 a deflection device with air outlet openings according to a second embodiment of the invention.

Regarding the explanation of 1 Reference is made to the introduction to the description.

2 shows a schematic view of an offset printing machine with labeling device. The printing press essentially comprises a printing unit 1 for printing the paper web 6 , a dryer 2 for drying the printed paper web 6 and one between printing unit 1 and dryers 2 arranged printing or labeling device 3 for labeling individual sections of the paper web (ie the paper web is provided with individual product-specific text, graphics or picture elements). By the arrangement of the labeling device 3 in front of the dryer 2 the press requires the press only a single dryer 2 for producing a double-sided printed and labeled paper web 6 ,

During printing, the paper web to be printed runs 6 at high speed in the direction of the arrow 7 through the machine, taking (from left to right) first of several pressure rollers 12a - 12d printed on both sides and then the labeling device 3 is supplied. For labeling, for example, high-speed inkjet printers are used. Other printing devices are also usable.

To the paper web 6 in the area of the print head of the labeling device 3 To position are several deflection 8a - 8c provided the paper web 6 lead accordingly and stabilize sufficiently. The diverters 8a - 8c are transverse to the direction of movement 7 staggered to each other.

As the paper web at the labeling device 3 still wet, she is allowed the diverters 8a - 8c do not touch. The diverters 8a - 8c are therefore designed so that on their surface 11 , along the paper web 6 runs, forms an air cushion, on which the web 6 is worn without the surface 11 to touch. Two examples of possible embodiments sol cher deflecting devices 8th are in the 3 and 4 shown.

3 shows a first embodiment of a deflecting device for non-contact deflection of the paper web 6 , The deflection device 8th is designed here as a deflection roller, which in a partial area 9 their surface 11 permeable to air. The outer wall of the guide roller 8th has in this case a variety of fine air outlet openings 10 , through which compressed air from the inside of the roller can escape to the outside to form an air cushion.

The roller has a connection 13 to which a compressed air hose can be connected, and a fastening part 14 on which they are transverse to the direction of movement 7 the train 6 can be mounted in the printing press. The guide roller 8th is preferably mounted fixed in the printing press, ie it does not rotate. However, it can also be designed as a rotating guide roller, if in the entire circumference air outlet openings are formed, but this has the disadvantage that a significantly higher energy consumption for generating the air pressure is necessary and does not need for the deflection of the web positions air.

4 shows another deflection in the form of a wedge-shaped deflecting beam 8th , The deflection bar 8th also has a surface 11 with a large number of fine air openings 10 for generating an air cushion. The surface 11 on the paper web 6 is carried, is formed curved. The bar 8th is preferably designed such that a paper web 6 can be deflected by an angle between 45 ° and 90 °. The deflection bar 8th also has a compressed air connection 13 and a fastening part 14 as described above.

Instead of air passage openings 10 can be the outer wall of the baffles 8a - 8c also be made of a microporous material, such as a microporous ceramic material.

The air pressure with which the diverters 8th be applied, is preferably between 2 and 5 bar at a web tension between 50 Nm and 70 Nm. The web speed of the paper web 6 is preferably between 10 and 25 km / h.

Due to the arrangement of the labeling device 3 in front of the dryer 2 The printing machine makes it possible to use the printing press with just a single dryer 2 to realize.

1

printing unit

2

dryer

3

marking device

4

dryer the labeling device

5

deflecting

6

train

7

movement direction

8th

deflecting

9

surface area

10

Air passage openings

11

surface

12

printing rollers

13

Compressed air connection

14

attachment portion

Claims (10)

Printing machine for offset printing, with - a printing unit ( 1 ) for printing on both sides of a web ( 6 ), which are in one direction of movement ( 7 ) is transported through the machine, - a dryer ( 2 ) for drying the printed web ( 6 ), and - a labeling device ( 3 ) for product-specific labeling of the web ( 6 ), characterized in that the web ( 6 ) in the printing unit ( 1 ) printed on both sides with ink, which has to be subsequently dried, is printed so that the printed, still wet web ( 6 ) of the labeling device ( 3 ) is fed and labeled, wherein in the labeling device ( 3 ) a deflection device ( 8a - 8c ) by means of which the still wet web ( 6 ) is deflected without contact and positioned for labeling and stabilized, and the printed and labeled web then the dryer ( 2 ) is supplied. Printing machine according to claim 1, characterized in that the deflection device ( 8th ) at least in a subarea ( 9 ) has an air-permeable outer wall. Printing machine according to one of the preceding claims, characterized in that the deflection device ( 8th ) is realized such that on a surface along which the web ( 6 ), forming an air cushion on which the web ( 6 ) without touching the surface. Printing machine according to one of the preceding claims, characterized in that the deflection device ( 8th ) is an elongate element which is transverse to the direction of movement ( 7 ) the train ( 6 ) is arranged. Printing machine according to one of the preceding claims, characterized in that the Deflection device ( 8th ) is arranged stationary and stationary. Printing machine according to claim 4, characterized in that the wall of the deflection device ( 8th ) about which the railway ( 6 ), a multitude of fine openings ( 10 ), can escape through the air. Printing machine according to claim 4, characterized in that the wall of the deflection device ( 8th ) is made of a microporous material. Method for printing a web ( 6 ) by means of a printing press in offset printing, wherein the printing press at least - a printing unit ( 1 ) for printing on both sides of a web ( 6 ), which are in one direction of movement ( 7 ) is transported through the machine, - a dryer ( 2 ) for drying the printed web ( 6 ), and - a labeling device ( 3 ) for product-specific labeling of the web ( 6 ), characterized in that - the web ( 6 ) in the printing unit ( 1 ) printed on both sides with ink, which has to be subsequently dried, printed, - the still wet web ( 6 ) in the area of the labeling device ( 3 ) by means of a deflection device ( 8a-8c ) is deflected without contact and positioned for labeling and stabilized, - the still wet web by means of the labeling device ( 3 ), and - the printed and labeled web ( 6 ) then by means of the dryer ( 2 ) is dried. Method according to claim 8, characterized in that the deflection device ( 8th ) is pressurized with compressed air, so that on the surface ( 11 ) of the deflection device ( 8th ) along which the railway ( 6 ), forming an air cushion on which the web ( 6 ) is worn without the surface ( 11 ) to touch. Method according to one of claims 8 or 9, characterized the web tension is 30 Nm-80 Nm, in particular 50 Nm-70 Nm.