US1308531A - Btjkg - Google Patents

Description

C. W. SAALBURG.

METHOD OF TRANSFERRING CARBON TISSUE PRINTS.

APPLICATION FILED FEB-27,1911.

menma July 1, 1919.

IN l/EA/ TOR A TTORA/E Y CJBEES W. SBURG, F RICHMOND HILL, NEW YORK, ASSIGNOR T0 MULTICOLU' INTAGLIO JESS COMPANY, OF NEW YORK, N. "Y A CORPORATION OF DELAW 11: v

METHOD OF TRANSEERRING- CARBON-TISSUE PRINTS.

Specification of Letters Patent.

Patented duly f, lQIil.

Application filed February 27. 1am Serial No. mace.

and State of New York, have invented cer-' tain new and useful Improvements in Methods of Transferring Carbon-Tissue Prints,

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of whichthe following is a specification.

This invention relates to a method oftransferringphotographically-sensitizedcarbon-tissue prints to copper or other etchable surfaces, and especially to those of rolls that are to be etched and used in multicolor printing. The object of the inventionis to 1mprove the development of the gelatinous content of the face of said tissue prints, to transfer them without air blisters, wrinkles, or stretching or shrinkage in so far as is possible, so that they will in settino on the surface to be etched be smooth thereon; and to moisten their paper backs when they have set, in such wise that when such backs are stripped oh the stripping will not so disturb the gelatinous faces of the tissue; printsv or the photographic images thereln contained as to impair correct development.

lln the accompanying drawings forming a part hereof and illustrating my invention in the best mode now known tome,

Figure l is a plan view of a layout mount of any suitable material on which are shown a plurality of photographically-sensitized carbon-tissue prints, each marginally secured by one of its safety margins to the mount, and with its face of gelatinous content outward. This view shows the mount provided on its upper face with projecting gum med tabs the upper or face sides of which are gummable to the surface to be etched.

Fig. 2 is an end view. of a copper roll to be etched and of a squeegee roll, the layout mount having its print-carrying face opposed to the copper roll surface, and being temporarily attached thereto by. the project-' ing tabs; and the prints having their faces of elatinous content opposed to the copperrol surface. The view also indicates a spraying device.

Fig. 3 is a top plan view of a simple form of apparatus useful in practising this method.

Referring to the drawings, 1 is a coppersurfaced roll to be etched. ft is indicated as revoluble in an end bearing for its man drel 2. In practice a suitable apparatus will have two bearings 3, one for each man-- drel end. A revoluble squeegee roll 4; is Indicated as extending lengthwise along the upper periphery of the copper roll with its axis rearward of the axis of the copper roll. llnpractice the apparatus will have two bearings, one for each end of the copper roll. The squeegee roll works as an idler. lts bearings are indicated by 5. A crank handle 6 is provided for the copper roll.

in practising my method lay out on a. preferably non-stretchable sheet mount-7 of endable material such as good strong smooth-surfaced paper of somewhat waterabsorbent character, any desired number of lid photographically sensitized carbon tissue prints 8 secwring each of such. prints by its upper safety margin by dabs 9 of fish glue or other material easily soluble in water,

to the mount. 'lhe backs of the prints are I opposed to the mount, the upper back margm of which I show provided with rogecting tabs 10 corresponding ends of w ich are. gummed to the back margin of the mount and project away from the edge thereof. Each tab 10 is gummed on its front projecting face at Ill.

The mount is rectangular or at least is cut with its upper or advancing'edge 12 straight, and this straight edge of the mount is carefully alined with a suitable guidemark or ids-marks 13 which may. be a series of a ined pencil marks on the copper roll. At leastfone of the side edges 14 of the mount is made at right-angles to the advancing edge 12, and the copper roll is provided with a suitable guide-mark 15 which extends peripherally and is at rightthe copper roll, the prints and the mount in the hot water. This loosens'up the mount at its points of attachment to the copper roll and also loosens up the mount from the backs of the prints by dissolving the glue; and therefore strip 03d" the mount and then strip of the paper backs of the prints, leavlOO llmi

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ing on the copper roll merely the gelatinous films to be, developed. For other rolls of the series corresponding prints are secured to the same mount or other mounts in exactly the same positions that the first series of prints has on its mount; and thereby I effect accurate registration of each cooperating print, one with another, in a series of etchable rolls for different colors.

The mount shown is provided with a series of location marks 15 of any suitable kind to serve as guides in location on the same mount or on a series of mounts of duplicate prints; and all the mounts for a given series are to have the guide-marks similarly placed on them.

If the apparatus indicated is used, I turn the copper roll, the squeegee roll being an idler, until the upper or advancingmargin of the mount is nipped by the squeegee roll and nipped and held in place not only by the weight of the squeegee roll, but also by the adhesive tab ends 11 sticking to the copper roll. By safety margins of carbontissue prints is meant that such margins do not contain any portion of the photographic image therein that it is desired to etch.

'There are many other ways of positioning the gelatinous face or faces of the photovgraphically sensitized carbon-tissue print or prints in opposition to an etchable surface, and it or they may be held in place by hand. but if manually manipulated the chances are that in gettmg a series of etchable rolls ready for etching there will be so many errors that ultimate essential registration will be defeated. My process, while applicable to a single roll for monocolor printing, is nevertheless particularly directed to multicolor printing, and the prints on the mount will be duplicated for the other rolls.

Having thus positioned the mount with its temporarily attached photographicallysensitized carbon-tissue prints in fixed alinement relatively to the axis of the roll, I lift the mount and the thereto attached carhon-tissue print or prints away from the copper roll as shown in Fig. 2, except at the n1p between the copper and squeegee rolls; and I carefully spray cool water into the bight or angular space between the oppos- 1ng surfaces of the copper roll and lifted mount and prints for the purpose of softenlng the gelatinous content of the print faces and making them adhesive. For the purpose of so gently and finely sprayingthe Water, the spray pipe 18 is provided with a serles of alined-very small pinholes 19 close to one .another. One end of the pipe is plugged at 20 and the other end is connectible to awater-supply pipe, not shown, for brlngingwater under head into the spray pipe.

During such moistening step in which flooding of the carbon tissue prints and mount is avoided, and as the gelatinous faces of the prints become sticky, I squeegee the prints in place on the copper roll by turning it and subjecting the backs of the prints to the pressure of the squeegee roll indirectly through the mount which I prefer generally to keep in place until the prints themselves have been smoothly squeegeed on the copper roll. I give the latter preferably only one turn.

If the paper backs of the carbon-tissue prints have become much wet in applying water into the bight mentioned, I carefully wipe them dry for I find that for the best results it is highly desirable to develop the gelatinous face of the prints into an adhesive condition without any soaking of the paper back of the print, as such soaking of the paper back tends to cause it to stretch or wrinkle in drying and thereby to shrink or stretch or wrinkle the photographicallysensitized face material of the print which has the gelatinous content and also contains the photographic image. The waterabsorbing mount acts as a blotter and helps in keeping the paper print backs relatively dry. It is for this reason that an important step of my method is to soften the print face with the least possible wetting of the paper back of the print, and thereby to complete the transfer operation in a minimum of time in order to diminish the risk of shrinkage or stretch of the tissue.

I prefer to apply a very fine and delicate spray uniformly into said bight, using as small an amount of moisture as requisite for development of the gelatinous content into adhesive condition. The carbon-tissue print is delicate to handle under the best of circumstances, and when it has an embedded photographic image the required delicacy of treatment is enhanced. Such photographically-sensitized carbon-tissue prints, when moistened and squeegeed in place are liable to stretch and when they dry they are liable 110 to shrink, and they are also liable to wrinkles and blisters and devils, as is well known to all skilled in the art. Moreover such prints, or the material of which they are composed, are subject to peculiar variations 115 in part and in whole due to natural variations in temperature and hygrometric conditions.

What I claim is:

1. The process of transferring photo- 12 graphically sensitized carbon-tissue prints having face material of gelatinous content on a paper back, to the periphery of an etchable roll to be etched and subsequently used as a printing roll, consisting in attach- 125 ing such a sensitized carbon-tissue print to a flexible mount with the back of the print opposed to the mount; in securing a margin of the mount to the etchable roll with the face of the print in position to contact with 1 0 the roll; in moistening the face of the print to develop adhesiveness in the face; in progressively squeegeeing the mount and print on the etchable roll by the rolling pressure of a roll parallel to the etchable roll and by such progressive pressure transferring the print to the etchablev roll; in removing said pressure; in detaching the mount from the etchable roll and from the print back; and in detaching the paper back of the print.

2-. The process of preparing a series of multicolor etched printing rolls for use in a printing press, consisting in providing each of a series of etchable printing press rolls with marks for obtaining registration of a series of etchings for successive colors; in transferring to each of said'rolls and so positioning thereon by the aid of such marks,

a carbon tissue print having a gelatinous face and a paper back, with its gelatinous ration of the gelatinous material; in subjecting the adhesive rint so located to a progressive pressure t at molds it without edgewise displacement. on. the roll; in stripping ofi the paper back; and in acidizing I each of the series of prints to produce a series of etchings for diiferent colors, one etching on one and another on another roll of the series of printm rolls.

In testimony whereo I have hereunto set a my hand this 16th day of February, 1917.

CHARLES w. SAALBURG.

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