JPS58140288A - Printing, and lithographic printing method manufacturing said printing, printing ink and lithographic press - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention The present invention relates to a printed matter obtained by transferring printing ink to a printing material using a lithographic printing plate by a lithographic printing method, a lithographic printing method for producing the printed material, and a printing ink. and relating to lithographic printing machines.

One known printing method is offset printing. In recent years, emphasis has been placed on offset printing for its economical benefits. Offset printing uses a non-acceptable layer of water to distribute an oil-containing printing ink film of 11 J- to the corresponding information areas of the printing four corners.

Offset printing plates have the property that they are hydrophilic at +'f which does not support information, and lipophilic at 'f' which support information.Printing-1: During the process, this The board is thoroughly moistened with a water coating (dampening solution) and subsequently inked with an oil-bearing printing ink. Hydrophilic spots that have been moistened with water cannot be wetted with a hydrophobic oil coating. , an inlaid printed image is obtained on the printing plate which is transferred to the printing strips via a roller mechanism.

The important advantages of offset printing are the simple, cheap and extremely fast production of the printing carrier, the direct production of the printing plate by electronic data processing, and the possibility of four-color wet printing.The high viscosity used in offset printing Consistent printing ink requires several levelings across the width of the press to create a completely uniform ink film.
The inking unit of an offset printing press has up to 30 rollers 4 between which the pasty printing is leveled. Because of this long, close roller, the low boiling solvents commonly used in intaglio printing cannot be used, and only high boiling solvents can be used. This is because otherwise the printing ink would already dry on the ink roller, thus impairing the flow of the ink.

The use of high-boiling mineral oils as solvents in offset printing inks has significant disadvantages, in which high-boiling mineral oils and vegetable oils are used as solvents, which are actually hydrophobic and water-insoluble. The drying may be continued for a long time, as the mineral oil requires a long time to penetrate (absorb) into the paper surface and is inhibited by the water present in the paper, or the drying temperature may be increased to an economically important high temperature. During heating to 150 DEG C.-160 DEG C., the paper dries and becomes undulating, making subsequent post-processing steps, such as cutting, editing and binding, extremely difficult. Historically, significant amounts of energy have been used for drying, for example with roller offsets.

In the case of offset printing, printing ink and dampening water are mixed during printing, ie an emulsion is created. This process itself is advantageous because the consistency of the printing ink that is adjusted thereby allows economical four-color wet printing in the first place. As is known to those skilled in the art, stripping of the printed ink from the printing material 51 by subsequently printed products is prevented by emulsion polymerization of the water. This process, on the other hand, has the disadvantage that a certain amount of time is required to adjust the ink-water balance when starting the printing press. Thus, in total 5 to 10 plates to be printed at the start-up and intermediate stops and again at the start-up of the printing press.
% will definitely occur as paper waste.

In order to overcome the above-mentioned disadvantages, attempts have been made to emulsion polymerize water into the printing ink already during its preparation. Despite strong publicity, this printing ink has often been unstable and has failed to serve its purpose. Since the oil and water separate and A (the jit is not adjustable and cannot be adapted to the paper or printed matter, it is necessary to install a separate dampening device in the printing press. Conventional printing inks are It can be noted that the printing press absorbs about 10-30% of water in the printed product.

WJr offset printing as well as the conventional offset printing mentioned above are well known. This method uses a special printing plate in which the ink-supporting layer is hydrophobic and the non-ink-supporting layer is made extremely repellent by means of a silicone coating. It can be printed with printing ink. This printing method has not been able to achieve widespread market acceptance despite the intensive processing. This is because four-color wet printing introduces the usual high I+ (1471 degrees) double problem. This J white, 1, especially the paper G which is sensitive to fluff, is ', 1. 'ru.

The problem of the present invention is to solve the above-mentioned drawbacks of the known technology '4: 1ull
1) by showing the printed material and its manufacturing method.
, in this case retaining the advantages of offset printing 1.71'
There is no need to use high boiling point organic solvents at all. Furthermore,
High losses during start-up of the printing press and during printing interruptions must be avoided.

By the way, 1. (1) Additionally, when producing a corresponding printing plate in lithographic printing in such a way that the printing surface is hydrophilic and the non-printing surface is hydrophobic, it is convenient to use water-based printing inks instead of oil-based printing inks. It has been found that water-based printing inks are known per se.However, water-based printing inks have hitherto been used exclusively in intaglio printing and flexographic printing.The disadvantages of oil-based printing inks have been known for a long time. Nevertheless, in the past, water-based printing inks were used in lithographic printing (J1 was not known.
It was surprising that it was possible to achieve good printing results when using .

It is therefore an object of the present invention to provide a printing ink containing primarily water as a solvent and/or dispersant, and which carries information, i.e. the printed side is hydrophilic and the non-printed side is hydrophobic. 71j, I, is the sign that a printing plate of 4A size 0 is used, and the printing ink is transferred by the lithographic printing method using a 4A size 0 lithographic printing plate? Concerning printed matter that has been printed.

Furthermore, the object of the invention also relates to a lithographic printing method in which printing ink is transferred line by printing line using a lithographic printing plate.

This method according to the invention uses a printing ink containing mainly water as solvent and/or dispersant and a printing plate which carries the information, i.e. the printed side is hydrophilic and the non-printed side is hydrophobic. It is characterized by

According to the invention, the printing inks to be used include colored pigments and/or C:11 soluble dyes, printing face F1 (4) and binders that adhere to the curves, for example in other areas of work, such as intaglio printing or flexographic printing. Contains other auxiliaries such as waxes, antifoams, antifoams, antifoams, and thickening agents, which are known from water-based printing inks or from the range of water-based lacquers and paints. Rir.

As a binder, minutes! ￥k i (& may be used or a water-soluble binder may be used.

Printing inks mainly contain water as a solvent and/or dispersant. The printing inks can contain, along with water, secondary organic solvents which are completely or partially miscible with water. However, as an auxiliary agent, only a small amount of petroleum distillate falls under this category. It can be noted that in this case the printing ink retains its aqueous nature.

Preferably it corresponds to an aqueous printing ink for intaglio or flexographic printing, but it is also possible to use an aqueous printing ink with a higher viscosity than the aqueous printing ink.

As auxiliaries for improving the fluidity, natural waxes and synthetic waxes can be used, as well as for other printing inks. Liethylene etc. are suitable. Partial fluorination of the auxiliary agent Gj1 improves the wear resistance in many cases.

Thickening agents may be inorganic or organic substances, especially 17F# or 11! A substance capable of 'il'IT is used.

Among others, the following are known: nyalginate, starch, cellulose and its derivatives, such as hilulose esters or cellulose ethers.

Similarly, -i'? It is effective for mineral substances that swell with polar solvents.

For inking, all known coloring ingredients are suitable, such as organic and inorganic colored pigments, in particular directly aqueous pastes, and dyes soluble in water or solvents. This product is known from other areas of the printing and paint industry.

The printing inks to be used according to the invention are produced by known methods. Thus, for example, a stirring device and a minute IK
The device allows the pigment, pigment preparation or predispersed pigment to be incorporated into the aqueous binder solution or mixture.

In order to carry out the method of the present invention, it is recommended to use a printing plate whose non-printing surface is coated with silicone rubber and whose surface where 1 blue + 7 is combined is a metal surface or a hydrophilic plastic surface. Advantageously, printing plates such as those used for example in so-called IS lie offset printing are suitable.

For good printability, that is to say for example to improve the repulsion of the ink in non-printing areas to printing plates coated with silicone rubber, it is advantageous to add additives containing silicone groups. This additive can be a dispersed silicone oil or a water-soluble silicone derivative.

The transfer of the printing ink from the inking unit of the printing press to the printing phase can take place directly or via intermediate carriers.

As intermediate carrier it is possible to use rubber blanket rollers known from offset printing. In general, it is preferably possible to use offset printing machines known per se, with the dampening device removed or disabled. If necessary, the position of the printing press is reduced, ie all rollers not required for ink transfer are removed. Alternatively, a means for rapid water evaporation is provided compared to high boiling mineral oils.

For this purpose, the inking device can also be sealed.

In one preferred embodiment of the method of the invention, the printing ink is transferred to the printing plate roller via a screen 1 roller which contacts the IF roller 13 and via a transfer roller arranged behind this screen roller. From this printing plate roller it is transferred via a rubber blanket roller to the printing material 4"l.

The screen roller preferably works as a dipping roller, ie it projects into the printing ink bath.

Instead of a single traction roller, two or more parallel traction rollers may also be used. However, it is important that the transfer roller in each case cooperates directly with the screen roller and the printing plate roller and that no further If sheets are subsequently connected.

In one preferred embodiment of the process according to the invention, the screen roller operates as a dipping roller, ie it projects into the printing ink reservoir. The printing ink can of course be prepared using other known methods such as 1? It may also be applied by brushing the vector roller.

In the method according to the invention, the disadvantage of the mechanical sensitivity of the rubber rollers forming the ink film is avoided by using a metal roller with a squeegee. This metal roller is also stable against bending and allows precise scraping of screens obtained by etching or gravure by using the two hands as supporting elements.

By virtue of the recesses which receive the ink evenly over the entire width of the screen roller, uniform inking is ensured at different points of the printed motif, independent of the use of different inks. This also corresponds to the popularity of offset printing. With conventional inking devices, the inking cannot be kept constant during the printing process.

Special requirements for high or low ink layer thickness, for example coarseness, can be met by replacing deeply or shallowly etched screen rollers.

Furthermore, a good ink supply can be advantageously obtained by controlling the temperature of the screen roller. This is because the viscosity of the ink no longer changes under the influence of temperature. For regular long inking devices,
This inking device is heated by internal friction and multiple separation processes of the ink, which results in a low viscosity of the ink during printing of the plate. Therefore, the ink transfer and the thickness of the ink layer in the printed image vary. Paper waste can only be prevented by careful and continued adjustment of the ink coverage by the printing press.
It is possible to do l-4.

In order to sufficiently reduce typing or completely recycle it,
Advantageously, the printing plate roller and the ink transfer roller have the same diameter. Historically, screen rollers and rubber rollers have the same diameter as printing plate rollers and ink transfer rollers.
It is advantageous for

The present invention uses a printing ink having mainly water as a solvent and/or dispersant, and a printing plate that supports information, i.e. the printed side is hydrophilic and the non-printed side is hydrophobic, and this It also relates to a printing ink for carrying out a lithographic printing method in which printing ink is transferred to printing io*1 using a lithographic printing plate, and this printing ink contains inorganic pigments and/or organic pigments,
It consists essentially of water as a binder and as a solvent and/or dispersant and is
10-250 Pa, B, preferably 2
It is characterized by having a viscosity of 0 to 5 Q Pa,s.

The printing inks according to the invention preferably contain silicone oils and/or water-soluble silicone derivatives.

The invention uses a printing ink containing mainly water as solvent and/or dispersant, and a printing plate which carries the information, i.e. the printed side is hydrophilic and the non-printed side is hydrophobic; It also relates to a lithographic printing machine equipped with an inking device, a lithographic printing plate roller and a rubber plunket roller, which produces printed matter obtained by a lithographic printing method in which printing ink is transferred to a printing material using a lithographic printing plate; The printing press comprises a screen roller and a screen that support the information of a printing plate roller, i.e. the printing surface is hydrophilic, the non-printing surface of this printing plate roller is hydrophobic, and the inking device contacts the 1♂ctor blade. It is characterized by comprising an ink transfer roller disposed between the roller and the printing plate roller.

Advantageously, the screen roller of the immersion roller projects into the printing ink bath.

In order to reduce or avoid stamping, it is advantageous for the printing plate rollers and ink transfer ports to have a turned diameter. Furthermore, it is particularly advantageous for the screen roller and the rubber blanket roller to have the same diameter as the printing plate roller and the ink transfer roller.

In order to obtain good printing results, the non-printing surface of the printing plate roller is preferably coated with silicone rubber and supports the information, i.e. the printing surface is a metal surface or a hydrophilic plastic. The following advantages are obtained with the invention: A short inking unit with fewer ink separation points significantly reduces the evaporation rate of volatile components compared to conventional inking units with a large number of rollers. Therefore, in this case it is possible to use inks containing water that quickly evaporate and are absorbed by the paper. Therefore, all physical drying processes, i.e. absorption of water into the paper, evaporation of water by heat setting in case of Tj-sea offset or evaporation of water by infrared heater in case of arc offset, are slowly absorbed. This is generally done more quickly than with conventional ink mineral oils, which either evaporate or evaporate.

One important advantage of the present invention is the reduction in imprinting due to the short inking device and the continuous renewal of the ink film by the screen roller.

The temperature in the roller offset-heat set dryer can be significantly reduced depending on the speed of the machine, the printing material and the thickness of the ink layer. This allows significant energy savings. The paper hardly dries,
It thus remains dimensionally stable, ie it does not absorb water from the environment after drying and no longer ``swells'' after processing or during storage. Moreover, this ink can be dried in an infrared heater under conditions favorable for roller offset.

This limit depends on the paper, printing speed and ink layer thickness. Unlike oil-based non-polar conventional offset inks, water-containing inks are suitable even for high frequency dryers.

Next, the present invention will be explained in detail with reference to examples. The drawing shows a sectional view through a lithographic printing press.

The lithographic printing press has an inking device 13 , a printing plate roller 3 , a rubber blanket roller 11 and a counterpressure roller 9 . A printing interest 10 passes between a rubber blanket roller 11 and a counter pressure roller 9. Inking device 13
consists of a screen roller 1 in contact with the 1-4 tank plate 1''2, and an ink transfer roller placed between the screen roller 1 and the printing plate roller 3. As shown, all rollers have the same diameter.

Example: 40 parts by weight of an aqueous emulsion of an alkali-soluble Fl'r acrylate polymer with a solids content of 4-0% by weight, 20 parts by weight of propylene glycol, parts by weight of triethanolamine, 35% by weight of an emulsion in methyl silicone oil. 1 part, 4 parts by weight of mineral oil with a boiling point range of 190 DEG C. to 250 DEG C. and 23 parts by weight of powdered ether δ heavy FIL were mixed to a gravity f:. Twenty weight parts of this mixture (aqueous pigment paste containing 45% by weight of copper phthalocyanine pigment) were added.

This material was dispersed into three R'-C'2's to form a uniform printing ink.

As a printing machine, an offset printing machine illustrated in the drawing was used. A commercially available silicone sheared printing plate was used as the printing plate.

Printed on coated offset printing paper. 7 (I) printed materials with acceptable quality were produced.

[Brief explanation of the drawing]

The drawing is a schematic longitudinal sectional view without showing a lithographic printing machine according to the invention. DESCRIPTION OF SYMBOLS 1... Screen roller, 2... Doctor plate P13... Printing plate roller, 4-... Ink transfer roller, δ... Printing ink tank, 9... Opposing pressure roller, 1...・Printing M size, 11...Rubber blanket roller, 13...Inking device

Claims (1)

[Scope of Claims] ■ Printed matter obtained by transferring printing ink to the printing material 441 using a lithographic printing plate by the lithographic printing method, which mainly uses water as a solvent and/or dispersant; , and a printing plate supporting the information, i.e. the printed side is hydrophilic and the non-printed side is hydrophobic. 2. In the lithographic printing method in which printing ink is transferred to printing materials using a lithographic printing plate, printing ink containing mainly water as a solvent and/or dispersant, and supporting information,
Zunao) A lithographic printing method for producing printed matter, characterized by using a printing plate whose printing surface is hydrophilic and whose non-printing direction is hydrophobic. 3. The method of claim 2J'1'' (described in Table 1) using a printing ink corresponding to an aqueous printing ink for intaglio printing or flexographic printing, but having a higher viscosity than this printing ink (+) . The method according to claim 2 or 3! [j), characterized in that the printing plate is coated with silicone rubber on the non-printing side. Claims 2nd to 4th features a printing plate having a plastic surface
The method described in any one of paragraphs. 6. The method according to any one of claims 2 to 5, characterized in that the printing ink contains an additive of silicone oil or a water-soluble silicone derivative. 7 In the lithographic printing method, printing ink containing mainly water as a solvent and/or dispersant and a printing plate that supports information, that is, the printing surface is hydrophilic and the non-printing direction is hydrophobic, are used. A lithographic printing method for producing printed products, characterized in that the printing ink of the inking device of the printing press is transferred via an intermediate carrier. 8. A method as claimed in claim 7, using a known offset printing machine. 9 Printing ink I? Through the screen roller (1) in contact with Kuku-sol-1' (2), placed behind this screen roller a; 11((
8. The method according to claim 7, wherein the printing plate is transferred from the printing plate roller to the printing material it (l O) via a rubber plunket roller (11) '6:]. 10 Screen Rosie (1) Kan Jil'1 Jr.
10. The method according to claim 9, wherein the printing ink bath (δ) is plunged into the printing ink bath (δ) as a J-roller. 1]-1 The method according to claim 9 or 10, wherein the printing plate roller (3) and the ink transfer roller (4-) have the same diameter. 12 Screen roller (1) and rubber blanket [J-sea (11) has the same diameter as the printing plate roller (3) and the ink transfer roller (4), especially 11'1
The method according to any one of claims 9 to 11. 13 This printing process uses a printing ink containing mainly water as a solvent and/or dispersant and a printing plate supporting the information, i.e. the printing surface is hydrophilic and the non-printing surface is hydrophobic. In a printing ink that carries out a lithographic printing method in which ink is transferred to a printing material using a lithographic printing plate,
as inorganic pigments and/or organic pigments, binders and solvents and/or dispersants, generally from water;
Printing ink for producing printed matter, characterized in that it has a viscosity of 1 O to 250 Pa, s at 23°C. 14. The printing ink according to claim 2 (> 13) having a viscosity of 20 to 50 Pa, B. Request range 13th
The printing ink described in item 14 ri. 16. Using a printing ink containing mainly water as a solvent and/or dispersant, and a printing plate supporting the information, that is, the printing surface is hydrophilic and the non-printing surface is hydrophobic, and this Printing material 1i is coated with printing ink using a lithographic printing plate.
In a lithographic printing press comprising an inking device, a lithographic printing plate roller and a rubber plunket roller, for producing printed matter obtained by a lithographic printing process that transfers to 'l, the information of the printing plate roller (3) is supported, i.e. the printing The surface is hydrophilic -○, the non-printing surface of this printing plate roller is hydrophobic, and the inking device (13) is 15"
A lithographic printing machine characterized in that it comprises a screen roller (1) in contact with (2) and an ink transfer roller (4) arranged between the screen roller (1) and the printing plate 1J-sheet (3). . 17. A lithographic printing press according to claim 16, wherein the screen roller (1) projects into the printing ink bath (δ) as a dipping roller. 18. The lithographic printing machine according to claim 16 or 17, wherein the printing plate 1-1 roller (3) and the ink transfer roller (4) have the same diameter. 19. Any one of claims 16 to 1δ, wherein the screen roller (1) and the rubber blanket 1 cola (11) have the same diameter as the printing plate roller (3) and the ink transfer roller (4-). The lithographic printing machine according to item 1. 20 Claims 16 to 19, wherein the non-printing surface of the printing plate roller (3) is coated with silicone rubber.
The lithographic printing machine according to any one of paragraphs. 21 Supporting the information of the printing plate roller (3), i.e. the printing surface is a metal surface or a hydrophobic plastic surface;
A lithographic printing press according to any one of claims 16 to 20.