Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS2291673 A
Publication typeGrant
Publication dateAug 4, 1942
Filing dateAug 2, 1939
Priority dateAug 12, 1938
Publication numberUS 2291673 A, US 2291673A, US-A-2291673, US2291673 A, US2291673A
InventorsEduard Schloemann, Fritz Albers
Original AssigneeGen Aniline & Film Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Production of printing forms
US 2291673 A
Images(1)
Previous page
Next page
Description  (OCR text may contain errors)

Aug. 4, 1942. F. ALBERS ETAL 2,291,673

PRODUCTION OF PRINTING FORMS Filed Aug. 15!, 1939 soft coating of res/Ln or the dzlke hardenoabde cololid dag er of bne or me like bag ta, M g er kwquer paper base Zacquew F10; tz Adi Jews Eduard Schaemwnn INVENTORS TH El R ATTORNEYS Patented Aug. 4, 1942 PRODUCTION OF PRINTING FORM Fritz Albers and Eduard Schloemann, Leverkusen-Wiesdorf, Germany, assignors, by mesne assignments, to General Aniline & Film Corporation, New York, N. Y., a corporation of Delaware Application August 2, 1939, Serial No. 287,858

Claims.

Our present invention relates to the producglogn of printing forms, particularly for flat print- A known process for producing forms for flat printing consists in writing by hand or by typewriter on a colloid layer capable of being hardened with a hardening ink. The layer is.then rolled with a fatty color which adheres only to the hardened parts. The script is then transferred by pressure to paper or the like. Alternatively, the colloid layer may be sensitized with bichromate and printed with a pattern by first expo in the layer to light through a copy. whereby the gelatin is hardened only at those parts which have been illuminated. The printing is performed as described above, namely by rolling the surface with a printing color which adheres only to the hardened parts. The process has the disadvantage that after the pattern or script has been applied corrections of the script on the printing layer cannot be made without damaging the surface of the printing material.

Our invention has for one object to avoid this disadvantage by providing a colloid layer capable of being hardened with a coating i-mpermeable to a hardening bath.

Another object of our invention is to provide a. colloid layer capable of being hardened and having a coating of such a degree of softness that by a locally limited pressure the underneath colloid layer is exposed. After application of the pattern the colloid layer is hardened in known manner and the coating removed.

A further object of this invention is the provision of a colloid layer which contains for the purpose of obtaining a better adhesion of the printing color to the said colloid layer a substance which imparts to its surface a certain porosity and roughness. For this purpose silicates, for instance kieselguhr, are especially suitable.

Other objects of our invention will appear more in detail from the following description.

The colloid layer may be given sufficient mechanical strength for the printing by supporting it on a carrier which may be of paper or of sheets of known artificial materials, such as Celluloid, Cellophane (registered trade-mark), acetyl cellulose, polymerized vinylchloride, polymerized styrene or the like. When paper is used it is preferable to coat it on both sides with Germany August 12, 1938 colloid layer may be supespecially high the sheet (for instance, aluminported on a'metal ium sheet) which, the colloid layer, may be roughened or provided with an intermediate sticky layer. Between the metal and the colloid layer there may be a layer g pattern has been applied. The coating may cona lacquer made from cellulose derivative'or the like in order to make it stable in the hardening bath. When the mechanical requirements are 5 sist of natural or artificial resins, cellulose derivatives or the like, of sufficient degree of softness. If necessary the degree of softness may be procured by the addition of the necessary proportion of a softening agent (for instance, tricresyl phosphate, natural or artificial waxes). The coating is to be so soft that by a locally limited pressure, for instance by the blow ofa typing lever, the coating is pressed aside and the underlying colloid layer is exposed. By manuscript or typescript or drawing on the coating layer which may first be covered with a thin sheet of paper, the colloid layer becomes visible as the script or drawing and these parts can be hardened in known manner by bathing the layer in a hardenin solution. After removing the coating layer by means of a bath of a solvent for the coating or in any other manner, such as by peeling, scratching or the like, and then moistening and rolling with a fatty color, the printing form thus made can be used for printing. A correctly orientated reproduction is obtained by performing the printing in a similar manner as used offset printing.

A section of one modification of a printing form in accordance with the present invention is illustrated in the annexed self-explanatory drawing. It is not intended, however, that the scope of applicants invention is to be limited to the modification shown.

The process has the special advantage that after the script or drawing or the like has been produced on the surface it is easy to make corrections by again applying the coating where the mistakes are and repeating the writing or drawing.

Theprocess is suitable when modified in obvious manner for producing high relief and basrelief printing forms. In this case the colloid for the better adhesion of is hardened throughout at the ing with the script or drawing.

The following examples illustrate the invention.

Example 1 On the baryta layer of a barytized paper lacquered on both sides there is applied first a gelatin layer and on this the following solution:

parts correspond- Victoria Blue 133 (see Schultz, Farbstofltabellen, 7th edition, 1st volume, No. 822) 1 After evaporating the solvent there remains on the gelatin layer a soft coating impermeable to water, upon which one can write so as to uncover the underlying gelatin layer. The paper is then bathed for a few minutes in a solution of. a chromium or zirconium salt capable of hardening the gelatin. The excess of this solution is removed by washing in flowing water and then the coating impermeable to water is washed away by a mixture of alcohol and ether (2:1). After moistening the printing surface with water containing lycerin a fatty color is applied by a roller and printing follows in. the usual manner. Instead of using hardening baths one can also sensitize the printing layer. It suflices in this case to expose the printing material to daylight. Since the colored coating light, the gelatin is hardened only at those parts where the coating is pressed aside.

Example 2 On the baryta layer of a barytized paper lacquered on both sides there is applied a gelatin layer containing kieselguhr. On this layer there is cast the following solution:

Polymerlzed styrene grams Carbon tetrachloride -cubic centimeters 8,877 Mineral oil as the softening agent -do 710 Sudan Blue G (see Schultz, Farbstoiftabellen, 7th edition, 2nd supplementary volume, page 261) grams 13 After evaporating the carbon tetrachloride there remains on the colloid layer a soft coating bluecolored and impermeable to water. On the printing material thus obtained one writes by typewriter. The printing material is then treated in a hardening bath. The coating is subsequently removed by bathing in carbon tetrachloride and the printing form is then rolled with a fatty color. Printing follows in the usual manner, for instance by an onset printing machine.

Example 3 On the baryta layer of a paper barytized and lacquered on both sides there is applied first a gelatin layer and on this the following solution:

is impermeable to the I .in the usual manner.

Example 4 On the baryta layer of a barytized paper lacquered on both sides there layer containing kieselguhr. On this layer there is cast the following mixture:

60 grams of collodion cotton carrying its own weight of spirit, 110 grams of higher aliphatic alcohols of 10-14 C-atoms or mixtures thereof, '70 grams of xylenylglycol, 15 grams of chlorinated diphenyls, 15 grams of butanol, 50 grams of the solvent consisting of methanol and esters of lower fatty acids, 20 grams of butyl acetate, grams of methylene chloride, 880 grams of denatured ethyl alcohol, 440 grams of ethyl ether. I gram of Victoria Blue or another dyestuff soluble in alcohol.

After evaporating the solvents there remains on the gelatin layer a soft coating impermeable to water, upon which one writes so as to uncover the underlying layer. The paper is then bathed in a solution of hardening agents and the coating is removed by washing with a solution of alcohol and ether (2:1). After moistening the printing surface with water containing glycerin a fatty color is applied by a roller and printing follows in the usual manner, for instance by an offset printing machine.

We claim:

1. In a process of producing a printing form from a printing material provided with a colloid layer, said colloid being capable of being hardened, the improvement which comprises applying on the surface of said colloid layer a coating impermeable to hardening baths and having such a degree of softness that said colloid layer is exposed by a locally limited pressure on said coating, applying a recording on said coating so as to expose said colloid layer at the parts of recording, hardening said colloid layer in a hardening bath, and removing said coating by washing 2. In a process of producing a printing form from a printing material provided with a gelatin layer, the improvement which comprises applying on the surface of said gelatin layer a coating impermeable to hardening baths and having such a degree of softness that said gelatin layer is expoud by a locally limited pressure on said coating, applying a recording on said coating so as to expose said gelatin layer at the parts of recording, hardening said gelatin layer in a hardening bath, and removing said coating by washing.

3. In a process of producing a printing form from a printing material provided with a gelatin layer containing a substance imparting roughness to the surface thereof, the improvement which comprises applying on the surface of said gelatin layer a colored coating impermeable to hardening baths and having such a degree of softness that said gelatin layer is exposed by a locally limited pressure on said coating, applying a recording on said coating so as to expose said gelatin layer at the parts of recording,

is applied a gelatin hardening said gelatin layer in a hardening bath, and removing said coating by washing.

4. In a process of producing a printing form from a printing material provided with a gelatin layer, the improvement which comprises applying on the surface of said gelatin layer a bluecolored coating comprising a mixture of collodion and trlcresyl phosphate and having such a degree of softness that said gelatin layer is exposed by a locally limited pressure on said coating, applying a recording on said coating so as to exposesaid gelatin layer at the parts of recording, hardening said gelatin layer in a hardening bath, and removing asid coating by washing.

5. In a process of producing a printing form from a printing material provided with a gelatin layer, the improvement which comprises applying on the surface of said gelatin layer a bluecolored coating comprisinga mixture of polymerized styrene and mineral oil and having such a degree of softness that said gelatin layer is exposed by a locally limited pressure on said coating, applying a recording on said coating 50 as to expose said gelatin layer at the parts of recording, hardening said gelatin layer in a hardening bath, and removing said coating by washing.

6. In a process of producing a printing form from a printing material provided with a gelatin layer, the improvement which comprises applying on the surface of said gelatin layer a blackcolored coating comprising a mixture of chlorocaoutchouc, chlorinated diphenyls, stearin pitch, and higher aliphatic alcohols with 10 to 14 C-atoms, and having such a degree of softness that said gelatin layer is exposed by a locally limited pressure on said coating, applying a recording on said coating so as to expose said gelatin layer at the parts of recording, hardening said gelatin layer in a hardening bath, and removing said coating by washing.

7. A printing material consisting of a support and two superimposed layers on one side of said support, the layer next to said support being essentially of a colloid capable of being hardened,

the upper layer being impermeable to hardening baths and having such a degree of softness that said colloid layer is exposed by a locally limited pressure on said upper layer and selected from the class consisting of resins and cellulose derivatives.

8. A printing material consisting of a paper layer and two superimposed layers on one side of said paper layer, the layer next to said paper layer being essentially of a colloid capable of being hardened, the upper layer being impermeable to hardening baths and having such a degree of softness that said colloid layer is exposed by a locally limited pressure on said upper layer and selected from the class consisting of resins and cellulose derivatives.

9. A printing material consisting of a paper layer and two superimposed layers on one side of said paper layer, the layer next to said paper layer being essentially of a colloid capable of being hardened containing a substance imparting roughness to the surface thereof, the upper layer being impermeable to hardening baths and having such a degree of softness that said colloid layer isexposed by a locally limited pressure on said upper layer and selected from the class consisting of resins and cellulose derivatives.

10. A printing material consisting of a paper layer and two superimposed layers on one side of said paper layer, the layer next to said paper layer being essentially of a colloid capable of being hardened containing a substance imparting roughness to the surface thereof, the upper layer being colored and impermeable to hardening baths and having such a degree of softness that said colloid layer is exposed by a locally limited pressure on said upper layer and selected from the class consisting of resins and cellulose derivatives.

11. A printing material consisting of a paper layer lacquered on both sides, a layer consisting of a colloid capable of being hardened and a substance imparting roughness to the surface thereof and fixed on one side of said paper layer, a colored coating layer coveringsaid colloid layer and being impermeable to hardening baths and having such a degree of softness that said colloid layer is exposed by a locally limited pressure on said coating layer and selected from the class consisting of resins and cellulose derivatives.

12. A printing material consisting of a metal layer provided on both sides with a paper coating, a layer consisting of a colloid capable of being hardened and a substance imparting roughness to the surface thereof and fixed on one side of said metal layer, a colored coating layer covering said colloid layer and being impermeable to hardening baths and having such a degree of softness that said colloid layer is exposed by a locally limited pressure on said coating layer and selected'from the class consisting of resins and cellulose derivatives.

13. A printing material consisting of a support and two superimposed layers on one side of said support, the layer next to said support being essentially of gelatin, the upper layer blue-colored comprising a mixture of collodion and trlcresyl phosphate and having such a degree of softness that said gelatin layer is exposed by a locally limited pressure on said upper layer.

14. A printing material consisting of a support and two superimposed layers on one side of said support, the layer next to said support being essentially of gelatin, the upper layer blue-colored comprising a mixture of polymerized styrene and ineral oil and having such a degree of softness that said gelatin layer is exposed by a locally limited pressure on said upper layer.

15. A printing material consisting of a support and two superimposed layers on one side of said support, the layer next to said support being essentially of gelatin, the upper layer black-colored comprising a mixture of chlorocaoutchouc,

chlorinated diphenyls, stearin pitch, and higher aliphatic alcohols with 10-14 C-atoms or mixtures thereof and having such a degree of softness that said gelatin layer is exposed by a locally limited pressure on said upper layer.

FRITZ ALBERS. EDUARD SCHLOEMANN.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2635537 *Jul 19, 1950Apr 21, 1953Warren S D CoPaper planographic printing plate with stabilized hydrophilic coating
US2962961 *Jan 28, 1954Dec 6, 1960Dilith CorpMethod of forming a printing plate
US2983220 *Mar 16, 1955May 9, 1961Timefax CorpElectro-sensitive planographic printing plate
US3113512 *Nov 6, 1953Dec 10, 1963Columbia Ribbon & CarbonPlanographic printing
US3139825 *Apr 5, 1962Jul 7, 1964Eastman Kodak CoMethod for preventing silicon dioxide contamination of lithographic printing masters
Classifications
U.S. Classification101/462, 524/575.5, 101/467, 101/401, 430/300, 101/461, 524/385, 524/322, 524/577, 524/474
International ClassificationB41N1/14, B41N1/12
Cooperative ClassificationB41N1/14
European ClassificationB41N1/14