US808331A

US808331A - Method of separating the galvanoplastic deposits from metal matrices.

Info

Publication number: US808331A
Application number: US26623205A
Authority: US
Inventors: Eugen Albert
Original assignee: Individual
Current assignee: Individual
Priority date: 1905-06-21
Filing date: 1905-06-21
Publication date: 1905-12-26
Anticipated expiration: 1922-12-26

Description

TmTTnp STATES PATENT oTTron.

EUGEN ALBERT, OF MUNICH, GERMANY, ASSIGNOR TO FERDINAND WVESEL, OF NEW YORK, N. Y.

METHOD OF SEPARATING THE GALVANOPLASTIC DEPOSITS FROM METAL MATRICES.

Specification of Letters Patent.

Patented Dec. 26, 1905 Application filed June 21,1905. Serial No. 266,232.

To all w71/0771/ it nm l concern:

Be it known that I, EUGEN ALBERT, a subject of the King of Bavaria, residing at 55 Schabingerlandstrasse, Munich, in the Kingdom of Bavaria, Germany, have invented certain new and useful Improvements in Methods of Separating Galvanoplastic Deposits from Metal Matrices, of which the following is a specification.

The ordinary way of detaching galvanoplastic deposits from metal matrices is to coat the surface of the matrix with some substance such as silver or graphite before the deposit is made, whereby the deposit may be the more easily separated from the matrix after the electrodeposition has taken place. While this method of separating the deposits from the matrices is satisfactory in some cases as with photogravures, for instance-good results are not obtained when this method is applied in the electrotyping art. Owing to the form of the type or printing elements, the deposits cannot be separated from the matrices, notwithstanding the application of a coating between the same, without causing more or less deformation of the electros. Another method of separating deposits from the matrix-base is to melt down the base, whereby it is destroyed and cannot be used over again.

The object of this invention is to provide a convenient method of removing galvanoplastic deposits from metal matrices in accordance with which the separating takes place so easily that the deposit or electro is removed in perfect condition,while at the same time the metal matrix or base is uninjured and may therefore be used over and over again.

In accordance with the invention the matrix with the deposit thereon to be separated therefrom is suddenly heated within certain deiinite limits of temperature, which causes the deposit to spring ofi from the matrix. This sudden heating can best be accomplished by providing a suitable bath, preferably a metallic bath, on account of the comparatively high temperature required, into which the l matrix with the deposit thereon is floated or immersed. If desired, however, the liquid from the bath may be poured upon the deposit and the matrix to effect the separation.

The temperatures of the bath should be chosen with particular regard to three considerations. The first consideration is that the temperature of the bath should not be too high, so as to affect the elasticity or hardness of the deposit, and thereby harm or ruin its printing qualities. In the next place the temperature should not be high enough to fuse the matrix, and thereby destroy it, so that it cannot be used again. Finally, the temperature of the bath should be sufiiciently above the fusing-point of the bath so that when the bath is cooled by the insertion of the matrices and deposits the bath should not solidify.

In carrying out the invention it is therefore preferable to provide a metallic bath with a considerably lower fusing-point than that of the metal matrix and to heat this bath almost up to the fusing-point of the metal matrix. In this way when the matrix with the deposit comes in contact with the bath it will be suddenly heated and the deposit Will be caused to spring off from the matrix, whereby it may be conveniently removed therefrom and the matrix used over again.

In the electrotyping art where copper deposits are formed and where a lead matrix is employed the bath may comprise the ordinary backing metal employed in electrotyping which fuses at 220 Centigrade, or an alloy of fifty-seven parts of lead and thirty-three parts of tin may form the bath, such alloy having a melting-point of 150 Centigrade.

In many cases the fusing-point of the backing metal will be suflicient to eifect the separation, and accordingly the separation may be effected simultaneously with the casting of the backing metal upon the deposit. The tinning of the deposit, which is done in order to secure the backing to the matrix, may be effected by placing the leaflets or foils of tin upon the deposit after its deoxidation, and

thus the deposit may be tinned over simultaneously with the detaching of the same from method consists in heating the bath to a point the metal matrix. lower than the fusing-point of the matrix and I claim as my invention l floating the deposit and matrix thereon. 5

ces by employing a metallic bath, which 5 1. The herein-described method of separat- In witness whereof I have hereunto signed ing galvanoplastic deposits from metal matrimy name in the presence of two subscribing ces, which method comprises the application witnesses. to the deposit and matrix of a metallic loath in EUGEN ALBERT. order to suddenly heat the deposit and matrix. Witnesses:

IO 2. The herein-described method of separat- HENRY HASPER,

ing galvanoplastic deposits from metal matri- VVOLDEMAR HAUPT.