DE1213863B - Thermographic planographic printing film - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

B41n

German KL: 151-3

Number: 1213 863

File number: C 30177 VI b / 151

Filing date: June 12, 1963

Opening day: April 7, 1966

The invention relates to the production of copies of an inscribed original sheet on thermographic printing Ways and in particular new flat printing foils that write on themselves under the action of heat, which can be labeled thermographically; the invention also relates to the method of their preparation.

It has been known for some time to use copies of an original sheet that has been written on of infrared radiation and using a heat sensitive transfer sheet or copy sheet. The radiation is thereby derived from the ones on the original sheet Image areas selectively absorbed and converted into heat. The imagewise heat pattern becomes is derived on a transfer sheet, where there is the transfer layer on the image areas of the original appropriate places melts and transfers, or the heat pattern is on one with in the Heat reactive chemicals coated copy sheets are dissipated with the chemicals on the areas corresponding to the image areas of the original react with one another to form colored characters.

It is also known to use planographic printing plates or foils by the transfer method described above to label, whereby the transfer layer is based on oleophilic substances and on the hydrophilic printing surface of a planographic printing plate or film, oleophilic, ink-receptive Image areas generated. This method has the disadvantages that, in addition to the printing plate or film, an oleophilic one Special transfer sheet is required and when handling the with the hydrophilic plates or Foil surface in contact with oleophilic transfer layer as well as during irradiation the same special precautionary measures must be observed. Even the slightest accidental Pressure during handling can contaminate or smear the oleophilic Material on the plate surface; although this is not visible to the eye, In the process, the plate becomes ink-absorbing in unintended places, and those obtained from the plate Copies are then colored in these places and are unusable.

It is also known that planographic printing plates which write themselves under the action of heat are not used prepare a separate oleophilic transfer sheet; however, such disks have also the above-mentioned disadvantage, easily in unintentional places by the action of pressure to be labeled. Namely, if the plate or thermographic planographic printing film

Applicant:

Columbia Ribbon and

Carbon Manufacturing Co., Inc.,

Glen Cove, Long Island, N.Y. (V. St. A.)

Representative:

Dipl.-Ing. E. Prince, Dr. rer. nat. G. Hauser
and Dipl.-Ing. G. Leiser, patent attorneys,
Munich-Pasing, Ernsbergerstr. 19th

Named as inventor:

Douglas Alexander Newman,

Glen Cove, Long Island, N.Y. (V. St. A.)

Claimed priority:

V. St. v. America June 13, 1962 (202188)

the foil is folded with the labeled original sheet or when the sheets are to be irradiated be prepared with infrared radiation, care must be taken to protect the plate or foil not to expose it to pressure, as otherwise it becomes ink-absorbing in unintentional places and the with it copies made are blotchy or stained in such unintended places. For the same Such pressure-sensitive plates or foils provide reason when they are used in pressure rollers Infrared radiation devices or problems with stacking many sheets or foils, the lowermost plates or foils being subjected to pressure as a result of the weight of those above will.

The object of the invention is thus the production of self-inscribing under the action of heat Planographic printing plates or foils which are essentially insensitive to pressure and which are conventional Way labeled by folding with a labeled original sheet and infrared radiation can be.

The invention also relates to the production of planographic printing plates or foils with a pressure-insensitive one hydrophilic printing coating, but made oleophilic by simply heating can be.

609 557/214

According to the invention, a thin, flat, uniform wax will be applied. To manufacture the

A moderately hydrophilic printing coating over a wax emulsion is the wax in a larger

emulsified amount of water located on the surface of a planographic printing plate. This is preferably done

borrowed heat-fusible, oleophilic coating by means of a conventional emulsifier, e.g. B. one

brought. 5 Mixture of a fatty acid and an alkali.

The following example illustrates a suitable one in the drawing

1 shows a schematic, enlarged transverse wax emulsion with water as the emulsion medium

sectional view of an inscribed original sheet and its application on a carrier under

and a heat-fusible, oleophilic layer that forms itself under the action of heat:

flat printing film, which are placed one on top of the other

are arranged and irradiated with infrared radiation Example 1, but separated for better explanation are shown, components parts by weight

FIG. 2 is an enlarged, schematic, cross-sectional Ouricury wax,,,., 4

Sectional view of a petroleum wax 4 produced according to the invention

and oleic acid labeled under the action of heat 6

Flat printing film. ,. Potassium hydroxide 8

The planographic printing plates according to the invention or water 100

foils have a suitable flexible carrier 20,

preferably of wet strength paper, as is usually the case is used for planographic printing foils. formation of a uniform emulsion with addition On the carrier there is a heat-melting potassium oleate soap as an emulsifier with one another Barer, oleophilic coating 21, which is preferably mixed and stirred. One stirs until the Form a watery! Suspension or emulsion on waxes evenly suspended in the form of the smallest particles and are pended to a layer with a rough surface 25 and the mass is smooth, spreadable was dried. Finally, is about the consistency it has got. This mass is then on oleophilic layer a thin, hydrophilic layer 22 applied to a carrier made of wet-strength paper, and made of a conventional planographic printing material, which after the water is deposited on the individual their drying, the planographic printing plate or film wax particles in the form of a colorless, heat-completed. 30 fusible, oleophilic layer with a rough porous

When the plate is heated in certain places, the surface evaporates, this surface becoming a becomes, which is preferably good absorption or retention by infrared irradiation the in F i g. 1 way shown happens, has melt assets for the planographic printing coating, the oleophilic layer and flows to the heated in relation to this printing coating Place in the hydrophilic top layer or become 35 no critical conditions; every known hydrovon this is absorbed, whereby these are phile colloid in these places and likewise each usually for becomes oleophilic. Binders suitable for planographic printing plates can

According to the invention it is favorable if the oleo- are used, e.g. polyvinyl alcohol, carboxy-

phile layer a rough, uneven surface - methylcellulose, casein, gelatin, sodium alginate

has, so that it has a holding capacity for the hy- 40 and the like.

Has drophile print coating. It is essential for the technical that the planographic printing cover a It is clear that oleophilic substances contain hydrophilic substances in a certain amount of filler; it was found, repel, which is why it is in the application of that the amount of filler used, z. B. clay, atta-thin hydrophilic coating on the strong oleopulgite, talc, barite white, titanium oxide and the like, with zuphile Layer has proven to be useful that the increasing thickness of the planographic printing coating increases the latter has a rough, uneven surface. In should. So z. B. with coatings with a thickness of this relationship gives excellent results, the ratio of filler to binding agent, if you get the oleophilic layer from an aqueous medium between 5: 1 and 7: 1. With planographic printers Wax emulsion or dispersion applies, over which coatings with a thickness of 1 point should be the Verbei the wax in the form of insoluble particles present 50 ratio between 4: 1 and 6: 1 while a is that on the support to form a layer ratio between 3: 1 and 5: 1 in the case of coatings get knocked down. In this way, having a thickness of 0.5 points is preferred. this layer has a rough, uneven surface which the planographic printing overlay is conveniently on legs good absorbency and a holding capacity known way insolubilized by entfür the hydrophilic coating gives what the 55 neither a salt, an aldehyde or the like. As a hardening case would be if the wax layer is added after a hot agent or by using the already melted technique would be upset. applied printing coating with the hardening

The most suitable are oleophilic layers on .the agent washes in order to make it so insoluble.

Based on hard waxes, e.g. carnauba wax, the planographic printing coating is preferably used in

Ouricury wax, petroleum wax, montan wax 60 Form of a thinner or lighter coating than

and the like, as well as mixtures thereof, since these waxes have hitherto been customary. Although over-

against displacement under pressure very resistance trains with a usual weight of 18.80 g / m ²

are capable. However, other common na- or more successfully can be used

Natural and synthetic waxes can be used considering the thickness and heat flow properties of the

provided that they are not water-soluble and 65 increase the oleophilic layer underneath,

that in the case of the softer waxes it is expedient to limit the weight of the

moderately thin layers or mixed with a planographic overlay to the order of magnitude of

or more of the aforementioned hard ones from about 2.35 to 14 g / m ² .

Claims (1)

5 6 The following example illustrates an inventive print coating. The molten, oleophilic material according to usable composition for which penetrates through the planographic printing coating and printing cover of a planographic printing film: makes its surface on the heated areas . . oleophilic. B e ι s ρ ι e 1 2 ₅ Of course, weight and strength can be both Components Parts by weight of both the oleophilic and the hydrophilic coating Sodium carboxymethyl cellulose 2 g ^{according to the} flowability of the oleophilic used 5% ammoniacal copper sulphate materials and the porosity of the planographic printing over-solution 40cm3 train can be varied. Chromium trioxide 0.5 g ¹⁰ ^ ^{m is} generally preferred the oleophilic Ferriammoniumcitrat l'o g layer applied so that it has a medium thickness Water has 90 "cm" ^{3 of} 3 to 5 points; 1 point equals Clay "8 g 0.0025 mm; the layer should be such that it has a melting point between 49 and 93 ° C. The foregoing components including FIG. The strength of the oleophilic layer is the Insolubilizing salts are directly proportional to the weight of the planographic printing coating, capable consistency mixed together and on the d. H. thinner planographic printing coatings require on the coated carrier according to Example 1 aiming at the desired results thinner oleo- Sensitive oleophilic coating applied, followed by phile sub-layers. stirring the water and the ammonia to form zo according to the invention provided with image areas an insoluble planographic printing overlay with plates or foils are conventionally used in Weight of about 7 g / m ² evaporated. Flat printing for the production of several 100 copies, The hydrophilic printing coating adheres very well to the exact same as the original sheet on used well on the thermo-fusible below. The invention can be modified widely Experience migration of the planographic printing coating into the pores without leaving their frame and the rough surface spots of the oleophilic becomes.
Coating. However, the printing overlay has
a relatively smooth surface and lies in Form of a thin, uniform, hydrophilic 30 patent claims:
Layer in front of which the oleophilic properties of the obscured heat-fusible layer. 1. Thermographic planographic printing plate or The planographic printing plate or foil obtained can be foil with a flexible carrier, d a d u r c h g e - handled, hit by a guy or indicates that the wearer is on his can be stored under pressure for a long time without a heat-fusible, oleophilic surface unintentionally disturbs the hydrophilic self-layer, which is produced by a hydrophilic printed Properties of the printing coating occur. kenden coating is covered, in which the oleo- If the printing plates or phile layer according to the invention in places where they are under - Foils are to be labeled under the influence of heat, the action of heat melts, penetrates and him this is done directly by means of a hot pen that can make 40 oleophilic. hot types or other hot bodies or pre- 2. planographic printing plate or foil by preference indirectly by means of radiant heat, as said 1, characterized in that the hydie Drawing shows. drophile printing coating a hydrophilic This consists of the carrier 20, the oleophilic binder and a filler.
Coating 21 and the hydrophilic coating 23 are 45 3. Planographic printing plate or film according to the upcoming plate with an original sheet, e.g. B. one spoke 2, characterized in that the ver-paper sheet 10, on which there is infrared radiation ratio of filler to binder about 3: 1 absorbing image areas 11, as this is up to about 7: 1. F i g. 1 shows, collapsed and with an infrared 4. planographic printing plate or film according to one of the Radiant light source 50 is irradiated. That can 50 claims 1 to 3, characterized in that take place in such a way that the superimposed the heat-fusible, oleophilic layer from Sheets through a thermographic copier wax particles, preferably made of carnauba wax, sends or a conventional flat-form infrared device Ouricury wax, petroleum wax, montan wax used. or mixtures thereof. The radiation is from the original image areas 55 5. Method for producing a through selectively absorbed and converted into heat, selectable or heat-inscribable planographic printing plate rend the unlabeled parts of the original sheet-foil with a flexible carrier, thereby gedie Radiation either reflecting or unabsorbed indicates that one is on the carrier let pass through. The oleophilic layer, heat-fusible from the original image, and on Heat generated is dissipated onto the plate, 60 this providing a hydrophilic printing overlay where it applies corresponding places of the oleophilic over- that from the oleophilic layer on Zugs melts; this then flows into the hydrophilic areas where it is exposed to heat printing coating or is absorbed by this is melted, penetrated and oleophilic, so that this can be made at the image areas of the origi- nal. nalbogen corresponding sites 25 is oleophilic, 65 6. The method according to claim 5, characterized in that like this F i g. 2 shows. indicates that the oleophilic layer is in shape This effect is based primarily on the porosity and an aqueous wax emulsion sity of the flat containing absorbent fillers - the water with the formation of a heat-melting bar, oleophilic layer consisting of individual wax stains is evaporated. 7. The method according to claim 5 and 6, characterized in that the hydrophilic printing Coating in the form of one composed of a hydrophilic binder, a filler and water Mass applied and then heated to evaporate the water. 8. The method according to claim ?, characterized in that a mass is applied, in which the filler and binder are present in a ratio of about 3: 1 to about 7: 1 are. 9. The method according to claim 6, characterized in that a wax emulsion is used which contains an emulsifier. 1 sheet of drawings