DE1471694A1 - Copper printing processes and machines as well as printed carriers made with them - Google Patents

Description

Dr. F. Zumsfein - Dr. E. Assmann

Dr. R. Koenigsberger Dipl. Phys. R. Holzhauer

Patent attorneys Munich 2, Bräuhausstrafje -4 / IiI

3006-65

Sociate * Anonyme de Publications Poriodiques Imprimerie S. Desfossoa-NeOgravure

Etching processes and machines, as well as printed carriers produced with them.

Priority: France, March 6, 1964

The invention relates to a method and a machine for copper printing and the means printed carrier produced by this process and machine.

For printing on a document or a

Another carrier in "Kupferdruok" is a preferably metallic plate (whereby under this expression both an actual plate and another part with a smooth surface

809813/0798

is to be understood, e.g. a leaf or a bowl), which is deeply engraved, whereupon with at least one im "Copperprint" usual color at least g ewiase areas of this Plate are coated in such a way that this color enters the depressions of these areas, whereupon the colored surface is wiped off, so that only the localized color in the depressions remains, whereupon the so-colored and wiped off Surface is pressed against the carrier to be printed, which is preferably a sheet of paper, which between them Surface and an impression cylinder is brought, whereby the colored motif occupying the wells of the plate This carrier is transferred · The transfer of the color contained in the wells of the plate can also be indirect take place by means of a roller, which is provided with a flexible coating and between the plate and the to be printed Carrier is arranged.

The invention aims in particular to develop such methods, machines and print media in such a way that they better than before to meet the various practical requirements correspond, in particular with regard to the difficulty of imitation and / or forgery of such carriers and the diversity the imprints that can be obtained from one and the same engraved motif.

The invention relates in particular to the case

^ that after at least part of the colored area Q before they are wiped off, but before they are pressed onto the carrier to be co-printed, an additional coloring of the Buchoa normal pressure is applied, i.e. by means of such a σ »

c? Color and such that this color only differs from the protruding Absohnitten the colored area is retained as

this "is common in letterpress printing, with which letter and other raised motifs can be used.

The invention essentially consists in the "copper printing inking" prior to wiping to leave a part of the engraved motif containing a portion of the plate uncolored and on this area to apply an additional "letterpress coloring".

Under the above term "area" means both

a single area as well as a set of areas

to be compared with equal or unequal surfaces and shapes stand.

The ones that remained empty in the "copper print coloring" Depressions in this area remain empty even with the additional coloring, with each depression only is framed by printing ink which does not enter it.

This trick finally allows the section of the motif corresponding to this area to appear negatively on the print carrier, which section consists of uncolored zones that appear on a continuous * background of printing ink.

The expansion of the additional inking can be limited precisely to the area that does not have "copper printing inking" has learned what makes it possible to obtain prints which look very strange and in the ^ ons * "" of the printed carrier are difficult to imitate, in which ^ the positive (in "copperplate") reproduced sections of the

co motif adapts to the others negatively (on a printing ink background) σ>

° reproduced other sections of the same motif anoo

close, especially if the lines of the chosen motif in these zones are narrow and numerous and close together

lie.

The invention is hereinafter referred to as an external reference explained on the drawing as an example

Pig. 1 shows schematically a device according to the invention "Etching Machine".

Tig · 2 shows very schematically on a larger scale a part of this machine to facilitate the understanding of a working possibility of the same «

FIG. 3 shows a section of FIG. 2 after a change according to another working possibility of this Machine·

Fig «4 and 5 show in plan view or in

Section along the line V-V of Fig. 4 a section a « according to the invention according to the mode of operation of the printed document shown schematically in FIG.

6 and 7 show a plan view or in section along the line YII-VII of FIG. 6 another section of a document printed according to the invention according to the mode of operation shown schematically in FIG.

In the example described below, it is assumed that, for example, a document of value is printed in Eupferdruck should be, e.g. a check, a banknote, a postage stamp, a security or the like.

The printing press has a well-known

Way a rotating cylinder 1 (Fig. 1), on the jacket of which at least a thin plate 2 (e.g. made of chrome-plated or non-chrome-plated copper, nickel or plastic), which is deeply engraved according to the motif to be reproduced by pressure, at least one inking cylinder 3 »thereof Surface corresponding to the zones of plate 2 to be colored

Appropriately let, a color system 4 assigned to each cylinder 3 (animal in Pig. I) ₉ one with cleaning organs, such as a brush 6 and a bakel 7, combined wiping cylinder 5, a printing cylinder 8 which unprinted with a system 9 for supplying clay Blattern and a system 10 for the removal of the printed documents is combined, devices not shown, which force the inking cylinder 3 »the wiping cylinder 5 and the impression cylinder 8 against the plate cylinder 1, devices not shown, welohe on the one hand the plate cylinder 1 in one sense and on the other hand set the inking cylinder 3 and the printing cylinder 8 in the opposite direction at the same circumferential speeds in rotation, and devices for driving the wiping cylinder 5 in the same direction as the cylinder 1 on

The above machine works as follows: As the cylinder 1 rotates, each plate 2 comes one after the other in front of each inking cylinder 3 »whereby at least certain areas of the plate are coated with paint, which fills the depressions of these areas, then in front of the wiping cylinder 5 », whereby the out of the plate from the plate the color in its depressions is removed, and close * Tor lent the printing cylinder 8, whereby the colored motif formed in the depressions of the plate on the to be printed Sheet is transferred, with this motif raised on the Sheet is reproduced

This process enables the production of very fine and varied impressions, welohe are difficult to imitate

In order to determine the area of application of this procedure, in particular with regard to the difficulty of imitation and /

809813/0798 ^ ₀ original

or to expand the Pal loop has already been proposed been »to carry out an additional coloration between wiping and printing · This is done against the cylinder 1 at least one additional inking cylinder 11 (weloher is combined with a corresponding single-color system 12) in the running direction of the plates 2 behind the wiping cylinder 5 and pressed in front of the pressure cylinder θ «

he

So far / however, the imprint corresponding to the additional color application followed according to a motif, which

φ had no special relation to the one engraved in the plate. In other words, the indentations of the plate were all lined with a "copperplate" during the staining prior to wiping, so that the additional staining took place on a wiped smooth surface with filled indentations, if it was not limited to non-indented sections of the plate . ^T his method therefore amounts, just on the impression carrier which is given in copper print motif a continuous

. borrowed reason or an additional motif to overlay which are completely independent of this motive.

In contrast, the invention successively uses two separate printing techniques ("copperplate" and "letterpress"),

to engrave under the exit of one and the same in the plate σ> th motif to obtain different visible effects

ο For this purpose, this is deepened in the

* ° plate of engraved motif, which was intentionally left uncolored in the previous "copper printing inking",

oo used to immediately match the motif of the complementary letterpress!

to form negative "

In other words, the entire cylinder 3

for the first application of paint »i.e. the one in front of the wiping cylinder 5 arranged cylinders »are designed in such a way that there is no ink in the inked and wiped surface Zones containing deeply engraved motifs remain, and these zones are provided with an additional application of paint with such a color that this color does not interfere with the Depressions of the surface to be provided with a paint application occurs, but only adheres to the raised sections of this surface, as in letterpress printing, with this additionally The application of paint can be limited exactly to these zones, or not

Fig. 2 shows the first of these two cases.One can see in this figure the cylinders 1, 5, 8 and 11 and an engraved plate 2 with depressions 13 ', of which only certain of those with grease paint after wiping the plate 14 are filled, the surfaces of the inking cylinder 3 are cut out accordingly

The surface of the cylinder 11 for the additional application of paint is arranged and cut so that the additional paint 15 is only applied to the previously uncolored zones of the plate 2, which are attached to attach the in-colored zones along lines 16, and the type of color 15 and the type of application the plate (in which in particular the composition - generally rubber or plastic - and the hardness of the covering of the cylinder 11 and its contact pressure on the plate play a role) are chosen so that this color does not go into the empty depressions of these zones occurs, as is well known in letterpress printing.

When the plate 2 is pressed against the carrier 17 to be printed (FIGS. 4 and 5), the on the Plate 2 deepened colored motifs (color 14) or the raised colored motifs (color 15) on the carrier gemäts a raised motif 19 of the "copper print type", which is reproduced directly "positively" on the carrier 17, or vegetables a recessed motif 20, which appears negatively on a "Buohdruekfarbengrund" 15, reproduced · If the a, e both Motifs are formed by two sections of one and the same drawing, which adjoin one another along a line 16, the two corresponding ones close to the Support reproduced sections of the drawing also along a line 18 (Fig. 4 and 5) to one another, which is surprising can produce effects that are visible and even very pleasant to the eye, but which are difficult to imitate, especially when the drawing is formed by numerous narrow and closely spaced lines. The continuity of transition namely is perfect because the two sections of the drawing of two adjacent sections of the same engraving originate.

Fig. 3 shows the second above case, in which the additional paint application on both the previously colored zones as well as zones free of color

In this case nothing is different from the previous case with regard to the "negative" representations (in 20, Figs. 6 and 7) changed · The "positive" representations 19 appear on the other hand on a color base 15 instead of immediately on the carrier 17

Ss is of course possible on the same

Carry the three types of rendering "negative", immediately "positive" and to use "positive" on a colored background, at the same time the coloring or hues of the different colors 14 and 15 and the carrier 17 can be changed, whereby an extraordinarily different reproduction possibility of one and the same engraved motif is achieved.

The additional color applied to the plates after they have been wiped off can be replaced by an erasable color or by creating a color which has such a composition that its authenticity is appropriate Medium (reagent, heat, etc.) can be determined.

It can then be twofold to limit the additional application of paint to zones with a small surface area of the plates, which correspond to places on the printed substrates which are intended for information in which any possibility of forgery by deletion is to be prevented. Such sites include · for the indication of the sums of money, identification numbers and the receiver on Sohecks, i instructions lottery billets, banknotes, securities, passports, identity cards or, more generally determined on any to protection of document.

With such a restriction, the <x> cn relevant zones of fat disks can be completely empty at will

^ remain or be colored beforehand before wiping off.

r- The areas that contain depressions

cn wtlohe are color-free near the "copper printing" and with ο

an additional application of paint (this Regions can only occupy a part of the surface on which the copper print color was not applied,

or on the contrary this whole flat) can in all cases have small surfaces, which have precisely defined shapes »and not just that of rectangles for receiving inscriptions, but also that of different motifs, such as numbers or other printed characters.

In this latter pail it is sufficient, for example, to use the

To surround cylinder 11 with a layer of a flexible material 21, as dash-dotted lines in Pig. 2, and then the relevant motifs on this Layer reproduce, in particular by the fact that number stamps 22 are printed against them, which are carried by a rotating cylinder 23 and in any desired manner to be colored

The surface of the wiping cylinder 5 must of course be contractual both with the fat colors 14 and with the additional lean or other colors 15. In In many cases it is useful to cover this cylinder 5 with a sheet of polytetrafluorethylene, for example.

It should be noted that the fineness and sharpness of the motifs printed with the copperplate process are not in any Case are impaired, since the depressions 13 of the plates 2 coming color H is always on the upper side of the printed carrier, in particular over the zueatz-

Q ₀ borrowed color 15 when the two types of color are superimposed

rv You can use the above printing press in one

- "* · single operation on one and the same carrier motifs or ο

^ Motif sections raised with the copperplate technique and others

ο motifs or motif sections according to a negative letterpress a

technology to print · This machine has numerous advantages compared to the known machines, especially eingiohtlioh

the difficulty of copying and / or forgery of the documents printed with this machine and the diversity and the richness of the reproductions that can be achieved with the given engravings.

The invention can of course be modified Thus, instead of being cylindrical, the recessed engraved blocks used can have a generally flat shape.

You can inking and wiping instead

by rolling, for example with the help of stamps, strips (made of paper, λ metal, textile material, plastic ο the like), or also by doctor blades, which, if necessary, can carry out the application of paint and wiping at the same time.

Claims (1)

ί 1 ·)) copper printing experience, in which deepened The motif to be printed is engraved in a plate, whereupon at least one of the usual "copper prints" is printed on this plate Paint is applied so that it penetrates into the recesses of the plate, whereupon the so-colored surface of the Plate is wiped so that only the color in the wells remains, whereupon the wiped off Surface an additional application of "letterpress ink" is applied, whereupon the surface prepared in this way is printed against a corresponding carrier, so that on this the different colors carried by the plate are transferred, characterized in that when coloring with "Copper printing ink" a zone of the plate is kept color-free, which contains a part of the deepened engraved motif, and that the additional application of letterpress ink takes place in this area. 2) Method according to claim 1, characterized in that that the additional application of letterpress ink is limited precisely to the area of the plate which is not included an order of "copper printing ink" was provided · 3.) Method according to claim 1, characterized by that the additional printing of letterpress ink is also extended to at least part of the surface of the plate to which "copper printing ink" was applied · 4.) Method according to at least claim 1, characterized in that an erasable ink is used as the printing ink 8 Ü 9 b 1 3 / Q798 Color is selected, with the area in question on the The carrier to be printed corresponds to a point which is intended to receive information that prevents forgery shall be. 5 ·) copper printing machine for performing the method according to at least claim 1 with a plate »in which ▼ deepens the motif to be printed is engraved, facilities for applying at least one common "copper printing ink" this plate in such a way that this color enters the depressions of the plate, means for wiping off the so-colored Surface of the plate in such a way that only the color located in the wells remains, facilities which on the so wiped surface apply an additional application of "letterpress ink", and devices which the so pressing the prepared surface against a suitable support in such a way that the various colors carried by the plate are transferred to it, characterized in that their devices for the application of the "copper printing ink" are designed in such a way that from this application of paint a zone of the Except for the plate, which contains a part of the deeply engraved motif, and that its devices for the additional application of the book print color are designed in such a way that they Apply paint to this area 6 ·) Machine according to claim 5 »characterized in that the extension of the additional order of Buoh printing ink exactly to which this area is restricted 7 ·) With the method according to at least claim 1 and by means of the machine according to at least claim printed carrier, daduroh marked that two separate 809813/0798 Share (19, 20) one and the same motif on it differently are shown, whereby one of these files, which is shown in "copper printing ink", appears positive and slightly raised, while the other, a lack of color corresponding feil appears negative on a letterpress ink background. 8 ·) Printed questioner according to claim 7 »characterized in that the two files of the printed motifs connect to each other 809813/0798