US1175779A - Transfer for printing on pottery and enamel ware. - Google Patents

Description

' print represent the heavy summon LErcEs'rEn, or LONDON, ENGLAND.

TRANSFER FOR PRINTING ON POTTERY AND ENAMEL WARE.

110 Drawing.

To all whom it may concern Be it known that I, SHELDoN LEICESTER, a British subject, residing at London, England, have invented certain new and useful Improvements in and Relatin to Transfers for Printing on Pottery and lnamel Ware, of which the following is a specification.

This invention relates to the preparation or manufacture of transfers for printing upon ceramic ware and vitreous porcelain or other enamel surfaces, such as decoration of pottery, stained glass and enameled metallic signs. Such transfers are at present prepared or printed by an ordinary lithographic process whereby the designs are drawn on stone or metal plates or engraved on plates mechanically or by hand; in the latter case an impression being taken from the engraved plate and placed on the stone or printing plate. This method necessitates a separate drawing for each piece of a set (such as dinner or tea service) of different size. From the stone the design is printed upon paper prepared with gum or dextrin for conveyance and on being wetted adheres to the pottery, the colors which are inorganic pi ments being burnt into the ware during ring.

By this .invention a photographic negative is made of the design, drawing, picture or subject taken direct from nature and a positive on glass or film taken from the negative; this positive is photographed on to carbon tissue sensitized paper, and the latter squeezed down onto a burnished metal surface such as a copper cylinder or plate. This is developed in hot water on the surface of the copper by immersing the cylinder and subsequently paintin out the margins with an iron per-chlorid or other etching medium) varnish resist and the design is finally etched thereon in relief.

A screen is used in printing the carbon transfer, or it can also be used when making the negative or positive' This acts as a pocket of varying depth to hold the right amount of ink to give the right shade on the plate. The thinnest parts .of the carbon shades, and the thickest parts the lightest shades, so that the various shades "are procured by the various thicknesses of the carbon, hence the etching fluid percolates through the carbon and etches the copper exactly in the gradations of the shade of the design photographically.

Specification oi Letters ratent.

to protect by Letters Patented Mar. 14, 1916.

Application flied November 21, 1914. Serial No. 873,416.

The copper cylinder or plate containing the engraving is placed on a printing machine provided with arrangements for supplying ink to the engraved surfaces, and also provided with a doctor knife which removes the superfluous ink and regulates the amount of ink retained in the engraving.

The paper Which is gum or dextrin coated is sheet or reel fe'd. The design may be similarly developed from a carbon print direct 'upon a plate and printed on a fiat bed photogravure printing machine. The cylinders or plates employed may be copper or steel or other metal either solid or deposited. The colors used will be pigment or mineral colors, such as now used in the decoration of pottery or glass, which will stand the firing process required for pottery or enamel ware.

By this-invention I am enabled to produce ceramic transfers by direct intaglio printing, that is direct froman engraved or etched copper steel or other metal cylinder or plate so that the pigment lies in relief on the surface of the transfer. The enlargement, reduction and reproduction of designs being entirely photographic will be much cheaper and more accurate than the old method and the range of pictorial photographic designs will be much greater.

The invention is also applicable for producing transfers for glass ware and vitreous or other enamel ware such as enameled iron plates for advertising or other purposes.

What I claim as my invention and desire atent is 2- 1. The process for preparing transfers for printing upon pottery and enamel ware which consists in preparing a photographic negative of the design direct from the drawing, picture or subject, obtaining a positive therefrom on glass or transparent film, photographing or printing onto a carbon tissue sensitized paper from the positive, affixing the latter onto a burnished meta] surface developing same onto the metal surface, etching the same into the metal surface in intaglio to receive the printing ink and finally printing the design therefrom in relief upon adhesive coated paper in an ink of mineral color suitable for ornamenting pottery or other ware substantially as described.

2. The process for preparing transfers for printing upon pottery and enamel ware,

which consists in preparing a photographic or gum coated paperin an ink of mineral. color sultable for ornamenting pottery and other ware substantially as described.

In testimony whereof I have hereunto set 15 my hand in presence of two subscribing witnesses.

SHELDON LEICESTER.

Witnesses:

JAMES S. INGRAM, J. P. HOWARD.