DE2445152A1 - Rotogravure printing device - Google Patents

Description

1 BERLIN 33 «MUNICH 80

Auguste-Viktorla-StraBe86 _n ΟΜορυΐ / Π Jt DADTMCD Plinz «nauerrtr« B · 2

P «t.-Anw. Dr. Ing, Ruschke Ur. KUoL> HI \ t Ot TAKlINtK Ptl -Anw DIpI-Ing

8SÄ ^D £ ^WBg · 'PATENTANWÄLTE ^Η ' ^η · ^Ε · ^RuKil *

f H * ^ BERLIN - MÖNCHEN ^{Telephone: m /} mnea. ·

Telegram address:

Quadrature Berlin Qudadrature monks

TELEX: 183786 TELEX: 522767

G 1524

Gravure Research. Inst., Inc., Fort Washington, Long Island, State of New York (V.St.v.A.) Rotogravure printing device

The invention relates to a device for rotogravure printing and in particular to a device for printing multi-page originals, with engravings comprising one or two pages can be produced by etching or engraving on gravure printing plates.

In the processes currently in use, engravings are made for a number of pages to be printed, for example for 16, 20, 24, 28 etc. pages put together and put into the outside of one Cylinder etched or engraved, which is then used for direct or offset printing of multi-page originals « After this, the printed sheets comprising several pages are slit open, cut to size and stapled in a predetermined manner folded up, tied to a book on a square,

509827/0786

TOsameng®clai »ert or also loosely 'laaaaea. The engravings for each side are in the outside of a cylinder so © in-etched or engraved that after folding the 'print sheet the individual print pages in the correct The order is present «The printout of each template is therefore printed on one side and folded up Product.

The preparatory work for the etching or engraving of! © tation printing cylinders for printing multi-page originals are expensive and time-consuming and essentially inflexible ”. The order of the sides of the product must be determined before the itzen or Engraving of the printing cylinder can be started. Once this work has been carried out, changes must be made to often all etchings or engravings on a single page all sides of the cylinder must be removed, after which the entire cylinder must be plated, etched or engraved again, Changes that are often desired are not carried out due to lack of time or costs. Because of the cost of the manufacture of the printing cylinder and the difficulties After making changes, gravure had found limited use for these purposes. This printing process was therefore only used when a large number of prints were to be produced without changes. This was the case despite the high print quality that comes with rotogravure printing can be achieved compared to other printing processes.

Some difficulties, which contribute to the increase in the costs of the rotogravure printing and which make it essentially inflexible, arise from the etching or engraving of the originals! several pages · » on the impression cylinder · With other types of '. Multi-page printing, 'for example b' in letterpress, similar difficulties have been avoided by the use of page-sized plates. The image of the original to be printed is first generated on the plates, after which a number of such plates were attached to the tr © um © la or cylinders for printing of the image and during the transfer of the colored image in front of the printing cylinder on the printing press, a gfu & k under process

509827/0786

■. ": ■■ ^.: - 5—

used than in the case of cotation depression

In the case of book or letter printing, the printing elements are higher than the non-printing parts of the printing plate. These higher-lying printing elements are colored, after which the color of these Elements is transferred to the pressure-absorbing material. Because of this, interruptions affect the Outside of the printing cylinder, for example by the plate edges or by the fastening means for the printing plates, as long as these do not protrude beyond the higher pressure elements, nods detrimental to the pressure.

In lithographic printing, the image is on the surface a plate, a cylinder or a drum * This is done by sensitizing the surface, whereby im Figure part the area is wetted by the color and to Printing holds back. The lithographic ink is thick and viscous and is being held back by the sensitized districts. At the Printing will apply the color from these districts to the printing absorbent pad transferred * Because the paint is thick and viscous and since the non-sensitized area is color-repellent, so when transferring the color consist of the other districts no difficulties. Should the lithographic ink settle in areas located below the surface of the plate the color will be due to its thickness and viscosity Print does not carry over. In the case of lithographic printing therefore interruptions on the outside of the cylinder or the Drum in the form of plate edges or fasteners for does not adversely affect the pressure

As already stated, in rotogravure printing the Artworks etched or engraved into the outside of the cylinder. Here are small indentations on the outside which are filled in with color for printing. The cylinder is by a container containing a very fluid paint passed through or flooded with such a color. By means of a hook! will be the color of the outside, of the cylinder scraped off, but remains in the depressions and is transferred from these depressions to a base when this is brought into contact with the cylinder. In contrast

£ 09827 / $ 078

if ^ tJ ϋ Vi

; £> aphi © _t wofeei tie h 4 © r Oberf lache iteTb © below the

fi @ ftomel5syliad © ra mad das

dee Zyliaders

slier Mmd @ rli @ li

aa cylinder for d @ n Hotatioastiefdruck «

because it has been difficult so ansubringen "u £> ₉ seta © £> e soleher plates at a · cylinder that si © wäte © ad of Bracken on the cylinder stationary stayed while aad © r @ rseits should be possible) © inselae plates to be able to replace «Another difficulty" was ₉ that it accumulates on the plate exicants and in the gaps between the plates, and furthermore that when the Bakel * is passed, it will wear out and the color will spread »

The invention overcomes these and other difficulties associated with the use of plate units in gravure, printing

The invention provides © ine printing plate for Hotationstiefdruck with an inelastic layer of a magnetically attractable material prior _s with which the plate can be attached to buckets magnetic cylinder and held ,, which plate is provided at a Seit® with depressions for receiving ink kara "Haoh attaching d © r printing plate on the magnetic cylinder during the rotogravure pressure in the wells Bitsende © färb transferred to a printing substrate to be printed with desired imaging d®p"

di © plates have been placed on the cylinder and held in place magnetically by di © s © m. TOrd © Sg image, the plates with the cylinder © in © firmly attached to each other © unit is the same way as if the «printed © image was etched or engraved directly into the cylinder surface ©» Di @ s is very

609827/0786

BAD OBIGiNAL

important, since with security there is a high quality print in the correct Alignment takes place when the substrate to be printed is brought into contact with the plates on the cylinder · At the same time one or more plates can be changed if - Changes are necessary or desired, so that in such a Not all of the engraving or engraving on the cylinder needs to be renewed. The ones required to make such changes Working hours and costs are significantly reduced by the invention. Furthermore, pressures in high inflation * even if on an or changes should or must be made on several pages.

The invention will now be described in detail. In the accompanying drawings is the

fig.1 a pictorial representation of a for the purposes of Invention usable plate,

Fig.2- a vertical section through the plate along the line 2-2 in Fig. 1 with etched or engraved grooves to take up the color for the rotogravure printing,

3 shows a diagrammatic representation of a rotogravure printing cylinder with the printing plates according to FIGS. 1 and 2 attached to it ^;

4 shows a detail from a sectional drawing along the line 4 · - 4 · in Figure 3 showing an embodiment of the invention shows, in which the space between the printing plates according to Fig. 3 ^ is filled with a filler material,

Fig ο 5 is a schematic representation of an embodiment of the Invention used for direct rotogravure printing will,

FIG. 6 is a schematic representation of an embodiment of FIG Invention used in offset printing and the

7 shows an illustration of the undercut cloth roller, which in the embodiment according to FIG. when carrying out the method according to the invention is used.

S09S2770786

Di © ia of FIg ₀ I shown® and as G & ases with 2 b © sei © hmate Platt © u © is © ia © Uaterlag® 4- aua @ ia © a mag & etis @ & aasiehbaren Hiat © 2? Ial j, wi © Stahl ₉ on. © © ui © © ia® Q "b © rflä © h © 6 eu® .einem sma ltE © a od ©! ¹ Gr2wi © r © ag © © iga © t © n Material ₀ To di @ s © a Purposes Mt siefe. Kiapf ©]? as Ibdsoad ©! ¹ ® good g © ®ign®t © Ewi®sea ₉ dag therefore for

si® at the ^1st

raises or verfossto Bi © Platt © dasf aadüs-erseitg nieht- as thick e © iE, _s that their KEräamag gw @ © ki Äapaseiaag aa the curvature of

U A © Platt © ait of not less than 0 _f 2 mm and not more than O ₅ J ii and © it © IAEM üapferbelag for etching or engraving with a Bick @ iron substantially not less than O _1, 05 ma and not more ala O ₉ 075 mm has proven to be satisfactory

As best seen from Figure 2 _e is below _9, the copper-'

Covering 6 of the plate 2 etched or engraved, the color being produced on n®hs @ nd® depressions, 8, 11 _δ 12, the width and length of which is generally shown enlarged · For the purpose of the invention The etching or engraving can then be carried out in the conventional manner. The dimensions of these engraved depressions are usually measured in microns and, depending on the lightness or darkness of the color to be printed, have different widths and widths at the point in question

6th
Depth © The copper covering can will etched or engraved at © bealiegender plate 2 _»s after which the plate 2 is bent and adapted to the curvature of the magnetic cylinder, ünderereeits the Platt © can also be bent first., Woaaeh the .Kupferbelag 6 etched or is engraved *, after the etching, the surface of the plate 2 can be plated with chrome _s as is common practice / if a wear-resistant® surface and a long service life of the plate is desired «,

We © am basten from Figo3 su © raehea IiSt ₉ , the plates adapted to the "curvature of the cylinder are placed on this and thereby held in place ₉ that di® magnetized" - outside of the

■ SO 9827/0786

Cylinder 10 the! Base 4 · of the plates 2 magnetically attracts « Depending on the format of the original to be printed, the plates be sized differently. As best from SIg.3 It can be seen that the plates 2 are attached to the outside of the cylinder 10 adapted so that after it is placed on the cylinder its outside, the otherwise with the one that receives the color image Material would come into contact from the plates 2 is covered · The panels 2 are preferably used for a single Dimension the print side so that the abutting edges of the Plates during the totation printing with the one taking up the color impressions Contact between the printed pages. Depending on the arrangement of the pages to be printed on Material, the plates 2 can be curved and held on the magnetic cylinder 10, so that the sides top edge to the lower edge, lower edge to the upper edge or side edge Side edge to be printed. As best seen in FIG. 3 1st, the front and rear edges of the plates that meet axially on the cylinder are cut to size in each case, that they form an angle of, for example, 5 ° with the axis of rotation of the cylinder 10. As will be described later, for some rotogravure printing processes the colliding Edges of the plates 2 (as can be seen from Figure 4) with

12th

a filler material. A quick drying material as an epoxy material that matches the material of the panels and the cylinder 10 that does not dissolve in the ink, that is wear-resistant and non-porous, and that can be applied as a viscous liquid or as a paste and If it dries flat and smooth, the preferred filler material.

As can best be seen from Figures 5 and 6, can a magnetic cylinder 10 with plates 2 magnetically held thereon are used for direct rotary printing, as shown in Fig. 5, or for offset gravure, such as shown in FIG. 6. As shown in Figure 5, the magnetic cylinder 10 with the magnetically held on this Plates, 2 in the frame of a So tat ion gravure press used and from a conventional drive, not shown Offset in rotation in the direction of the arrow.

509827/0786

.8th

A pressure cylinder 22 with the conventional _9, for example made of rubber "outer pad 24 is inserted into d © a lame 20 offset in 'sighting d © s Pfails® in turn. · Between the plates 2 on Cylind © 2> 10 mad d @n BraekgyliaddX ¹ 22 ζ · Β · ame Rnpi © r best @ 3tead © i> 3fe® © km © .t © riiil 2b ia RI © atmiag of the arrows © at d © 2 "B © w © iips§; d © u Itai © la! at © rialg 26 between the plates 2 nut, de »Brae & gyliaiäer 22, FaxTö® from the depressions aa d © r ÄuSeaeeit® d © s ·. Platt © »2 _S w © to the Tertisfongen with the Bsm @ kaatei? Ial 26 ia! © smtaPnag g © laag © n ₉ amf the aruclnamaterial 26 transferred imd amf diüisem © in g © draekt © ® Äfefeild the Yorlage creates ο D® r © lägeisck © Ämß © nfe> © lag 24 na Bora © teajlindes * 22- kama with Unt © raeiineidBS§®n ia d @ n ^ @ nig @ a B® ^ irk © a, which are provided during the Bructon - mater the Platt © aspalt®a are located so that the bridge is generally neglected in these areas during the bridging process,

In the illustrated in Fig © 5 tesfütoungsfopia the magaetiscte Zyliaäes is 10- gefülarto The zra on top of the plates 2 to the cylinder 10 "in its Brelrang in clearing of the arrow diar © h © inen dye container 28? Üekbl © i1bend © ink is scraped from the Bakel 30 wherein in the wells. 8 "11 ₉ 12 after the Pig * 2 Färb © remains ,. which is transferred to the printing material 26 _s if the ¥ ®rtiefungen to the plates with the printing material 26 on the impression cylinder 22 in contact get®

When the Earb® is stripped from the outside of the plates 2, whereby in the Y © rtiefung © n _s such as S-, 11, 12 printing ink remains} in the embodiment according to the .Figo5 & i © Hakel 30 paints in di @ - gap © between the plates 2 out © in ₉ unless this gap © is filled with a © a filler material 13 (Figo4) "If color © remains in ö @ n unfilled gap®" back _s this is carried out Coloring the plates 2 on the cylinder 10 on the Bruelsa material 26 ₉ . u © nm di © s © g engages with the Plattensp'alten in _a Berühruag Due d @ r Groß® the plates and places d © © r gap between -the islands © © n print pages, the imprint of the Bpalt @ s when cropping d © r printed pages cut away ^ © r = the © As already stated ₈ can be filled with a filler material, the plate column 13 wera © n _s uie shown in Pig _o 4,

509827/0786

so that there is no longer a gap and lead to an impression can »At the same time, there is no cutting away in this lall of the imprint. -

In the embodiment shown in Figure 6 for the Offset rotogravure printing is a magnetic cylinder 10 with a number of magnetically held printing plates 2 in the Frame 52 of the printing press used and of a not shown conventional drive in the direction of the arrow in rotation offset. Am transfer cylinder covered with an offset cloth 36 34 and a pressure cylinder 38 are inserted into the frame 32 and rotated by a conventional drive (not shown) in the direction of the arrows * Between the cloth

, 38

reference 36 on the transfer cylinder 34 and the printing cylinder a material web 40, ζ · Β · made of paper, introduced.

In the offset printing according to FIG. 6 the magnetic cylinder becomes 10 with the plates 2 held on this while rotating, guided through a dye container 42 and when the The cylinder with the plates rotates past a doctor blade 44, so the paint is wiped off from the top of the plates 2. at the rotation of the cylinder 10 is the in the depressions, ζ * Β · 8, 11, 12 remaining paint on the plates 2 on the cloth on transfer cylinder 34 and blanket 36 onto the printing material 40 transferred when the printing material is on the impression cylinder 38 with the cloth covering 36 carrying the color images got.

As best seen in Figure 7. can be seen, in the offset printing according to the -Figο6 the cloth cover 36 on the transfer cylinder 34 is preferably provided with distinctions in those areas that coincide with the gaps between the plates 2 when the cloth cover 3β with the ^v plates 2 on the magnetic cylinder 10 in contact got. It is therefore not necessary to fill the column with a filler material (13 according to FIG. 4) in order to prevent the column from being imprinted. As can best be seen from FIG. 7, the cloth cover 36 has an undercut, shown at 50, which runs transversely to the cloth cover on the transfer cylinder, as well as an undercut 52,

509827/0786

the circumference runs ₀ Bi © Unt © rsehn @ idung 50 'can do something

© aiig @ ad broad "be measured,

© in © Aapagsttsg as di © ■ seteäg verlamf © ad @ B, Plattsnfcanten while des Dsiiekens su "bei ^ iAeso Bi © Mnt © 2 ^> seiiaitt © a © a District® 501 52 are on the plates 2 aa magaetisohen Zyliad®r 10 so aligned; ,, that b © -id®a contact dor plate 2 on cylinder 10 with the cover 36 on the printing cylinder J ^ di © column swischsn d © n plates 2 with the Tuclib®ZMg 36 not in contact but ■ much melar of the undersetasidiinges on the Tu © hb © ziag 36 are spanned “color that can be added or returned in the columns OTis @ h®nd © a plates 2”, is then referred to the cloth ™ 36 no transfer © a _o This avoids any transfer of images of the gap © on the plates 2 on the magnetic cylinder 10 to the transfer cylinder 3 ^ usd the printing of the printing material with images of this column, /

laughing d @ r Brfladung be the disk 2 held on the magnetic cylinder 10 by the magnetic attraction force between the cylinder 10 and the pad 6 _S m> retained in each plate independently ψοά other plates on the cylinder "It can therefore be individually plates removed and replaced "If the gaps between the plates have been filled with a filler material, as shown at 13, this filler material is also removed when the plates are replaced and later renewed after attaching a new plate to the cylinder 10" The possibility of drying individual plates independently To be able to remove and replace other plates enables partial changes to be made in the printing plate position. This is particularly important when printing newspapers, magazines, journals and the like, where τοη 'issue to issue or for distribution to different © districts changes of the content are desired *

In the direction _s in which the plates 2 according to the invention are used in rotogravure printing *, the front and rear edges are bevelled, for example, at an angle iron 5. the beveled front and rear edges become parallel to

609 8-2 7/0786

placed one against the other, and all panels are at the same angle tailored. The panels are cut at the side edges so that these edges run parallel to each other and extend on the magnetic cylinder 10 in the direction of rotation. The sloping course of the front and rear edges on the Plate 2 on cylinder 10 prevents impact loading of the doctor blade, when the gap under the squeegee as the cylinder 10 rotates wanders by. On the other hand, the doctor blade could also be at an angle to the cylinder 10 can be arranged. This is especially important in the event that if the gaps between the plates are not filled with a filler material, as shown at 15, as this causes splashing of paint and wear and tear of the squeegee is prevented this column is filled out, especially for a longer period of time continued rotary printing prevents uneven wear of the squeegee on the printing surface, which is caused by the plate surfaces and the Fill material is formed. -

¹ claims

50 98 27/078 6

Claims (1)

Claims Printing plate for rotogravure printing, characterized by a non-elastic pad made of a magnetically attractive material with which the plate is attached to a magnetic Cylinder can be attached and held in place, which plate on one side with recesses for receiving can be provided with a printing ink, so that with etation gravure after attaching the printing plate to the magnetic cylinder, the color in the depressions on a the ink-receiving surface is transferred to that formed by the depressions on said plate surface Figure is to be printed. Printing plate according to claim 1, characterized in that that side of the plate on which the intended for printing Depressions are generated, consists of a copper coating. A printing plate according to claim 1, characterized in that said plate side is one which receives a dye Depressions is provided. Printing plate according to one of Claims 1 to 3, characterized in that that the front and rear edges of the plate in the direction of the rotary print run obliquely to this Printing plate according to claim 4, characterized in that said edges run obliquely and parallel to one another. characterized in that the cylinder is ^ a ^ -mggne table and! Λ a number of pressure plates jL- ^ flrCl ^ any of the foregoing Claims to ^ dj ^ r ^ teSinseite magnetically holds, with the -ls @% te ^j fe-eB®aarr- ^; B & e— 509827/0786 ORIGINAL INSPECTED Blank page