DE1016127B - Process for making hectographic prints and photographic material therefor - Google Patents

Description

The invention relates to the production of numerous hectographic prints one on photographic Paths obtained hectographic printing form.

It is known that colorless inks are also used in the usual printing processes. In this Case, a substance is used as the pressure fluid, which by chemical reaction with a second substance located on or in the sheet of paper, either black or colored Can generate pressure. As is known, multicolor printing can also be carried out using a single printing color which occur through chemical reaction with substances that are in or on certain places the sheet of paper are, produced a different color tone from the printing ink, so that one final receives a multicolored print.

There are several methods of copying an original one or more times (for example, text, Line drawing) hectographically.

The best known is the process according to which the text to be copied or the drawing with water-soluble Indian ink is applied to a little porous paper. This paper comes with the with Water-moistened surface of a gelatin glycerol layer brought into contact. The ink is absorbed by the layer and the text or drawing appears in mirror image on the Surface of the layer. If a white paper is now placed on the damp surface, the ink becomes partially taken over from the paper and a positive print is obtained. Let this be imprinted repeat several times until the ink is used up; so you get several copies.

Another method is to place a specially prepared carbon paper with the dye side against a sheet of paper. The other side of this paper is z. B. written with a pencil or other pen or with a typewriter. As a result of the pressure exerted, the dye of the carbon paper is transferred to the side of the paper that is not written on, ie _; a mirror image of the text or drawing is created on the back of the sheet of paper. This sheet serves as a printing form for making prints. You now take a blank sheet of paper and moisten it with a solvent (e.g. alcohol or water) for the dye in question. If this sheet is then brought into contact with the printing form, a little dye is dissolved and transferred to the blank sheet, so that a legible copy is created. This can be repeated several times until the amount of dye in the printing form has been used up.

Method of manufacture

hectographic prints

and photographic material therefor

Applicant:

Gevaert Photo-Products NV,
Mortsel, Antwerp (Belgium)

Representative: Dr. W. Müller-Bore, patent attorney,
Braunschweig, Am Bürgerpark 8

Claimed priority:
Netherlands 11 May 1955

Albert Emiel van Hoof, Antwerp (Belgium),
has been named as the inventor

Obviously it is difficult, cumbersome and time consuming to get complicated To make such a printing form for texts or drawings by rewriting, typing or tracing. In addition, it is very likely that errors will be made.

These difficulties are eliminated by photographic production of the printing form. It is known to produce colored photographic images from an original by that a more or less hardened gelatin relief image can be obtained from the original by photographic means produces, which is soaked with a dye solution. Dye solution is absorbed from the relief image, whereupon it is brought into contact with a copy material whose absorption capacity for the present dye is higher.

By a different process, from an original using one on photographic The way to produce a print is not the dyes themselves, but rather the dye components absorbed, which under the influence of substances present in the image base or sometimes only through the use of other auxiliaries in the final picture base are converted to the dye.

According to the above procedure, the hydraulic fluid or its components are either applied to the printing surface according to the image or absorbed by soaking, etc. through a relief image, which forms the printing form ". This method is

709 697/241

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for the production of a hectographic printing form This is rinsed in water, a general one Applied in the photographic way, but has exposure and exposed to it to the full the disadvantage that each time soaking only one blackening was treated with a tanning developer Amount of dye or dye compodel. The unhardened gelatin is made by bathing nente is added, so that for preparation 5 in one of the known solvents, such as warm from several prints the die several times water, aqueous rhodanide or urea solution, must be soaked, which is quite time consuming and washed away or by pressing on a sheet of paper is awkward. removed, to which the non-hardened gelatin adhere-It has now been found that this disadvantage remains. It remains a positive reflection of Origi's success can be eliminated and that one is left of one io nals, consisting of a relief of any hardness Original can make numerous copies, ter gelatine, in which besides black silver also if the dye component is still present.

1. This original photographically on a light-sensitive according to another embodiment of the invention Material is reproduced, but its silver coating is still possible to use the printing form on Halide emulsion is preferably not or only 15 easier to prepare. A silver halide emulsion is used as the lightly colored, water-insoluble dye composite material contains components, the image produced by using, which by exposure and development hardening development selectively on the substrate which immediately gives a positive image, e.g. B. by SoIaphotographic Material can adhere, during risation or Herschel effect. In this case it will the rest of the emulsion is removed, 20 immediately after exposure in a hardening bath

2. then the remaining hardened, which winds, whereupon only the non-hardened gelatin Dye component-containing image as a printing form must be removed by rinsing in order to be used brings the copy paper into contact, forming the ready-to-use printing form.

Printing form and / or the copying liquid either the printing form and / or the paper and / or the

separately or in combination means for implementing 25 copying liquid must either separately or in

the dye component contained in dye, and combination containing such agents, soft quickly

finally and at room temperature the dye components

3. Convert the printing form into dye in the presence of the copier. If the emulsion is a leuco liquid always contains new copy paper in base, the printing form and / or the paper must Brings contact. 30 and / or the copying liquid contain agents,

This method allows any which either separately or in combination to

Original both on an opaque surface, as well as conversion of the leuco base into dye an oxidizing

Paper printed on one or both sides, as well as having a rendering effect. To this come especially

numerous prints on a transparent base for high-quality cerium, vanadium, manganese

produce. 35 common compounds, dichromates, etc. Next, the

As the dye component in the emulsion of the layer of copy paper products to increase

photographic material itself incorporated and the lightfastness of the organic dye, such as

In addition, it is insoluble in water, it is contained in the heteropolyacids.

Printing form (without any special impregnation and without

lust) over a large amount of dye components, 40 that either the dye component in the emulsion

resulting in the production of numerous copies of sion or the dye formed is dissolved and

is of great importance. can diffuse over to the copy paper.

The light-sensitive material consists of an aqueous solution of an acid, preferably

Silver halide emulsion based on a suitable non-organic acid such as oxalic acid, lemon

Substrate, such as paper, synthetic film, etc., acidic, tartaric acid, etc., is particularly satisfactory

is brought. as a copying liquid when using leuco

The dye component is a base in water. It can also be an acidic compound

poorly soluble compound; It is in fine-use. It is possible to do one at the same time

distributed state in the emulsion. Well suited oxidizing salt (such as cerium sulfate) to select

are z. B. the leuco bases, especially of tri-50s. Viscosity, surface tension, drying

phenylmethane dyes. speed etc. can be passed through as desired

The leuco base is added to the copying liquid in an organic solution.

medium, such as B. alcohol, dioxane or benzene, improve.

dissolved and with vigorous stirring of the emulsion Example 1 added. If necessary, the dispersing 55

With the help of emulsifying agents such as saponin, Al- a direct positive silver chloride emulsion, kylnaphthalene sulfonic acid salts, polyglycol derivatives with vigorous stirring per liter of 20 g in 50 cm ³ , etc., are facilitated. After the emulsion warm ethanol dissolved leuco malachite green using one of the set in the photographic. The emulsion, which now contains finely divided methods known in the art, for example on paper leuco base, is applied to a photographic paper, can be applied from this mate paper. After drying, a printing form is made with rial. It is understood from this material by reflective exposure that the dye-forming portions of the obtained original are photographed. The development form for creating a legible copy on winding takes place in a hardening developer which the copy paper must form a positive mirror image of the original. To this end, the light _ ... sensitive layer exposed according to the image, for example on solution A

refleographic path. According to usual, not water 1000 cm ³

hardening development will result in a negative image. Catechol 25 g

testifies. 70 sodium sulphite (crystalline) Ig

Claims (1)

5 6 Solution B This release paper is used to make copies ^{as in the previous BeiWasser 1000 cm 3 games.} Potassium carbonate 125 g B e i s ρ i e 1 5 A part A is used with a part B 5 in an ordinary silver halide emulsion mixed and then added to 6 parts of water is dispersed as in Example 1 leuco base. joined. After application and drying, exposure is carried out Bathing in warm water does not make this material and then develops in the following hardened gelatin washed away, and a positive bath remains: tive mirror image of the original left, which as 10 water 1000 cm ³ Cliché serves. Monomethyl p-aminophenol sulfate 1.5 g . ^{Em P} / P !! ^r T ^IRD ™ * ^{"ner S} S ^au f (cryst.) ^{1 k} g GeIa- sodium sulfate 50 g tine, dissolved in 101 water, precipitated 5 kg- hydroquinone 6 g nem barium sulphate and on top with a layer of sodium carbonate '(crystall.) ".'. '.'. '.'. '. 100 g 20 g of Kalmmpermanganat, dissolved in 1 l of water, 15 potassium bromide 1 g coated. After drying, this is the copy paper. After developing, watering is carried out for 1 minute. For copying, the copy paper is rub with a solution of 50 g of oxalic acid in the hardening developer of Example 1 11 Slightly moistened with water. The copy paper 20 winds. Further processing takes place as in is then immediately lightly on Example 1 for about 1 second. Printing form pressed and removed again. There will be _D in this way by repeatedly pressing fatentanspbüche: about 100 green-colored reproductions of the original 1. Process for the production of hectographic generated. 25 see prints, characterized in that on Example 2 of a light-sensitive material whose silver halide emulsion one preferably not or It is exposed and developed as in Example 1. little colored, finely divided and water-insoluble die non-hardened gelatin but does not contain omitted dye component, a photo-rinsed, but is produced by pressing the still moist 30 graphic reproduction, whereby from Layer removed on a paper. After photographic printing of this material in the non-hardened gelatin remains a positive on the paper of hardened gelatin as a printing form stick which is thrown away. The copies are formed in relief mirror image of the original and are further obtained as in Example 1. this image in the presence of a copy liquid-π · ·, Ο 35 in contact with a print-off paper is brought while the printing form and / or It is exposed as in Example 1, developing the copy paper and / or the copier liquid and rinsed in warm water. By soaking the means either separately or in combination Reliefs in a solution of 50 g of potassium permanganate to convert the dye component into colorant 1 liter of water creates a brown color that contains manganese, so that on contact it becomes colored oxides. positive copy of the original on the copy Ordinary paper is made with a solution paper. from 200 g of tartaric acid in 1 1 of water slightly an- 2. The method according to claim 1, thereby moistened, indicates that one is the photosensitive The peeling is carried out further as in Example 1. 45 layer according to the image by reflective means The dye is formed in the printing form, diffused, developed without hardening, rinsed, all- dated over to the paper and delivered in it a positive-common exposure and again in a tanning one colored print. Developer treats what one does not Example 4 removed hardened gelatin parts. 50 3. The method according to claim 1, characterized A paper is drawn with a layer of the following that the photosensitive layer consists of a Coated composition: Direct positive type silver halide emulsion 100 cm ^{3 of} an 8% gelatin solution, which is image-wise on reflectographic 44 cm ^{3 of} a 25% mangate sulfate solution, exposed to light and developed to harden, 170 cm ^{3 of} a 3% hydrogen peroxide solution, 55 after which the non-hardened gelatin parts are removed 250 cm ³ ammonia N / 2. _r will be. © 709 697/241 9.57