DE2817332A1 - DEVICE AND METHOD FOR PRINTING FIBROUS MATERIAL - Google Patents

Description

A. GRÜNECKER H. KINKELDEY W. STOCKMAIR

OR-ING. - AeE (CALTB3H »

K. SCHUMANN

OR. BER NAT ■ EHPL-pms

P. H. JAKOB

G.BEZOLD

CR REFl NAT.- Dtrt_-CHEM.

8 MUNICH

MAXIMILIANSTRASSE

April 20, 1978

PH 12 674

STOBK BRABANT B.V.

43a Wim de Körverstraat

NL-Boxmeer

Device and method for printing fibrous material

The invention relates to a device for printing a web of fibrous material, provided with two or more driven printing devices, such as cylinder stencils or Rouleaux or gravure rollers, which each work together with a support roller opposite them, with a supply for the material to be printed is provided. Such a device for stencil printing is known from under
Others include OE-PS 13 A 8805/74, DE-PS 24 46 886 and CH-PS 575-296.

809844/0848

TELEPHONE (O8O) 03 28 63

TELEX OE-29 38O

TELEQRAMS MONAPTH TELECOPER

When printing on fibrous material, there is a problem of swelling of the fibers due to moisture absorption. This moisture comes from the paint paste or ink ' which is fed to the material in the printing devices. This swelling causes an increase in length Eisiko from the formation of wrinkles, which of course must be avoided. It could then be attempted that every subsequent Printing device for taking up the excess length is driven somewhat faster. Such progressive drive speed could not be realized because the length increase that occurs is not in the is certain in advance.

The invention aims at a simple solution, which is achieved in that the material web is supported directly by the support rollers during operation and that the support rollers are provided with a slip drive, the speed of which is 0.5 to 1.0 % greater than the TJmfangsgeschwindigkext of the templates or Pressure rollers. As a result of these measures, the support rollers are driven with a lead with respect to the rotational speed of the stencils or pressure rollers, and in this way the material extension between the successive printing devices can be canceled with minimal web tension. It is important here that the printing takes place without the use of the usual support tape or a printing blanket, on which the material to be printed is usually worn. In the device according to the invention, the material web is supported and guided exclusively by direct contact with the support rollers. As a result of the somewhat accelerated movement of the material web, the advantage of an extended service life of the cylinder templates is also obtained, as described in OE-PS 256.14-5, DE-PS 1 271 072 and CH-PS 4-17 514.

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The problem of avoiding creases or creases in the material web can be solved even more effectively if according to the invention, the contact zones of the successive Support rollers with the associated printing devices bark the victory over the guiding path of the web of material to be printed form which line has a broken concave course with respect to the rollers. Due to the fact The fact that the path makes a small angle (e.g. 10 °) as it passes each support roller results in a repetitive one Balancing force in the web, which also ensures wrinkle-free and crease-free conveyance.

The invention relates in particular to a device as described above in combination with a drying box for the printed material web. In particular, when printing on paper, drying immediately after printing required to get a first quality transfer paper, wrapping paper, wallpaper paper and other products, of which the carrier consists of a stable, sheet-like material. According to the invention the printing devices are according to FIG set up two approximately vertical lines, with the drying box above it with one mainly horizontal rail line.

Printing in a vertical path is known per se, but in the combination just given is only very little floor surface required, although a drying box that takes up a lot of space is still used can. The vertical printing distance also has a favorable influence on the occurrence of wrinkling in the train.

The invention further relates to a method for printing a web of fibrous material, in particular paper,

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with use of two or more stations, each provided with a driven printing apparatus, which method is characterized in that the material web in each printing station directly supported by a driven support roller Wix ^ d ", where .jedez ^v roller is provided on a Schlüpfsntrieb a peripheral speed , which is slightly greater than the speed of the associated stencil or pressure roller. By means of these measures, the carrier rollers are driven with advance slip with respect to the stencil speed and can in this way cancel the extension of the material between the successive stencils with a minimal web tension will.

The invention is based on the drawing, in which very schematically an embodiment of the device is shown, explained in more detail -will.

Fig. 1 gives a picture of a number of printing devices shown in are set up in a curved line.

Fig. 2 shows a complete device provided with two vertically set up pressure groups in combination with a drying box. .

The device according to FIG. 1 is provided with four driven pressure devices, designed as cylinder stencils 1-4, which each ^{- work} closely with a support roller 5 opposite these stencils. "On the side of the device shown on the left in the drawing is located a supply 6 of the material to be printed, in this case a paper web 7 · Furthermore, a pair of rollers 8, 9 is provided for the supply of the .Material. The web 7 is supported directly by the support rollers 5, which support rollers with the associated printing devices -1- 4- form the bending points of a guide section A of the material web to be printed 7. As can be clearly seen, this section has a broken concave course with regard to the rollers 3.

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The support rollers 5 are provided with a Sehlüpf drive $ · " which is formed by an endless belt 10 with a drive 11. The band 10 is around part of the circumference an ex * on each support roller 5 attached.-disc, 12 lead. The belt 10 is further along a number of rollers 13. guided. The drive 11 of the endless belt.10 is over a transmission .14 with the pair of rollers 8, 9 coupled. .

The fibrous material to be printed 7 kat the tendency to to stretch when moistened. This creates the risk of wrinkles or creases. To prevent this risk, the following measures are taken: The support rollers 5 are driven via the slip drive 10, 11 at the speed of the templates 1-4. A value applied in practice is 7 o / oo. Veiter becomes the pair of roles 8, 9 also driven somewhat faster than the printing devices 1-4 u.z. about 1 o / oo to at most 4 o / oo. The speed of this pair of rollers 8, 9 is decisive for the speed at which the material web passes through and promotes the life of the stencils 1-4 by the occurrence of an alternating load at the location of the squeegee (OE-PS 256-145, DE-PS 1 271 072, CH-PS 417 5 ^). As a result of the advance of the support rollers 5, the possible material extension in the web 7 between the successive printing devices with minimal web tension To get picked up. The support rollers 5 work together directly with the underside of the web 7. Also the curved shape of the Guide path A contributes to the occurrence of wrinkles or wrinkles because of the location of each printing device the web 7 is guided over a small angle along the associated support roller 5.

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Fig. 2 shows a complete printing machine for a paper web in which two printing lines A1 and A2 are provided. These two approximately vertical stretches are set up on both sides of a support 15, which is in the Bread the left soap e of the device indicated in Fig. 2. is located. On the right-hand side, a second support 16 is provided for supporting the feed and discharge means of the web 7. A drying box 17 rests on the two supports 15 and 16 a height of over 2 m above the surface of the ground

The printing path Δ1 consists of four roller or rotogravure printing rollers 19j while the printing section A2 according to IPig.1 is formed by four cylinder templates 1-4-. The combination gravure-screen printing is from the older Dutch Patent application 69.03989 as well as the OE-PS 321.323, the DE-PS 20 07 954 and CH-PS 4-97.980 known. This is a Universal machine received, with which printing of all kinds in can be carried out in the most convenient manner. The placement on both sides of the support 15 makes all the pressure devices particularly easily accessible, while the drying box 17 is no obstacle.

The support 16 is provided with some rollers 20 for feeding the web 7 coming from the supply in a container 21. On the underside of the drying box 17 some rollers 20 are still arranged, so that the web 7 in the direction of the track A2 of the first printing devices 1-4- is guided. One or more of the printing devices can be used to print the web 7 1-4- actively participate, depending on the type of end product required. After passing the pressure devices 1-4- the web 7 is guided over two rollers 20 arranged at the foot of the support 15 in the direction of the printing path A1, of which one or more Rouleaux roles 19 can also be effective,

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After covering the routes A2 and A1, runway 7 the drying box 17 carried out, in which by means of a powerful stream of heated dry air a drying of the Railway is carried out. In box 17 are a number F * ah.ruIigr.roIlen 22 set up in such a way that they form an upwardly convex curved path for the web 7 ″. After leaving the drying box, the web 7 is along a cooling roller 23 guided in the support 16 to finally wound up in the container 25 via a number of guide rollers 24 to become.

It should be noted that the same conditions are maintained in the routes A1 and A2, as described with Refer to Fig. 1. At the top of the support 15 is the pair of rollers 8, 9 provided for the correct driving of the web 7

The advantages of the device described exist in particular from the various measures which are taken to absorb the stretch that occurs during the pressing of a fibrous Material web can occur due to swelling, are hit. What is important here is the somewhat accelerated slip drive the support rollers 5 and the curved shape of the printing and drying section.

809844/0848

Le e rs ei \ e

Claims (6)

PATENTANWÄLTE A. GRÜNECKER QPL-ING. H. KINKELDEY DFl-INtI W. STOCKMAIR K. SCHUMANN Μ DR RER MAT.-DIPL-PHYa PH JAKOB D (PL-IAXx G. BEZOLD Dd RBl NST.- OtPL-CHBJl 8 MUNICH 22 MAXIMIUANSTHASSE 43 PH 12 674 Patentan s ρ rumor 1.J device for printing on a web of fibrous material, see with two or more driven printing devices, such as cylinder stencils or Rouleaux or rotogravure printing rollers, which each work together with an opposing support roller, with a supply for the material to be printed being provided, characterized in that the material web (7) passes through directly during operation the support rollers (5) is supported and that the support rollers are provided with a slip drive (10, 11) at a speed which is 0.5 to 1.0 % greater than the peripheral speed of the templates or pressure rollers. 2. Device according to claim 1, characterized in that the contact zones of the successive Support rollers (5) with the associated printing devices, the bending points of a Pührungsabschnitt (A) to be printed Form material web, which route has a broken concave course with respect to the owls. - 2 - 809844/084 » omm ^ L inspected TELEPHONE (Ο8Θ) 39 28 62 TELEX 0B-Q9 38O TELEGRAMS MONAPAT TELEKOPIBRER 3. Apparatus according to claim 2 in combination with a drying box for the printed material web, characterized characterized in that the printing devices according to two approximately vertical paths (A1 and A2) are set up and that the drying box (17) is above it with a mainly horizontal railway line. 4-, device according to claim 3, wherein in the drying box a number of guide rollers is provided, characterized in that the guide rollers (22) are of such a type are set up so that they have an upwardly convex curve Create a stretch for the web to be dried. 5- Device according to one of the above claims, characterized characterized in that the slip drive for the support rollers (5) by an andloses belt (10) with a Drive (11) is formed, which belt runs along part of the circumference of a disk attached to each support roller (12) is beaten. 6. Apparatus according to claim 5, characterized in that the drive (11) of the endless belt (10) with a pair of rollers (8,9) for the supply of the material web (7) is coupled in such a way that this pair of rollers has a tangential speed which is 0.1 to 0, A % greater than the speed of the printing devices. 7- method of printing on a web of fibrous material, in particular paper, using two or more stations, each provided with a driven printing device, characterized in that the web of material is supported directly in each printing station by a driven support roller, each roller having a slip - 3 809844/08 * 9 drive is given a peripheral speed that is roughly greater than the speed of the associated Template or pressure roller.