A printing plate useful for printing a magnetic toner resist comprising a support substrate, a layer of a magnetic material, and a top layer of fluoropolymer with a critical surface tension not greater than 24 dynes/cm and a hardness greater than 5.1 Adjusted Vickers. The printing plate has good release properties, minimizes or avoids premature build-up of toner in the background areas, provides an extended temperature window for transfer, and has an extended life.

1 - L'invention concerne un procédé d'impression, ainsi qu'une machine, qui permet d'obtenir des images en couleurs sur un support d'impression.

2 - La machine qui applique ce procédé comporte des têtes magnétiques (13-1,....,13+n) excitées par des impulsions envoyées par une source (26) par l'intermédiaire d'un dispositif de calibrage (27) pour former sur le tambour (10) des points magnétisés ayant des aimantations différentes, des dispositifs applicateurs de pigment (40, 42, 44), des dispositifs de retouche (41, 43) et un poste de transfert (45) où les pigments déposés sur le tambour (10) sont transférés sur une bande de papier (21).

3 - Application aux machines imprimantes magnétiques.

Die Erfindung betrifft ein magneto-optisches Aufzeichnungs- und Wiedergabeverfahren für bewegte Informationsträger durch Besprechen eines magnetisierbaren Informationsträgers in Form eines Bandes, einer Platte oder Walze während der Bewegung mit Informationsbereichen, die in einer Richtung der Informationsebene größer als 0,2 und kleiner als 20 µm sind, durch geometrische Strukturerzeugung durch Einwirkung der Magnetfelder der aufgezeichneten Information auf Teilchen, deren größte Längsausdehnung kleiner als 0,1 µm, vorzugsweise 0,02 um, ist und optische Abtastung dieser Strukturen, in dem Licht von 0,38 bis 0,8 µm Wellenlänge an der Oberfläche des bewegten Informationsträgers gebeugt wird und Beugungsbilder entstehen, die zur Auswertung der Information dienen.

A magnetic imaging process and imaging member comprising an electrically-conductive layer overcoated with an electrically-resistive layer, wherein a latent magnetic image is formed on the imaging member by heating selected portions thereof. The latent image is then developed by contacting the imaging member with a magnetic toner composition. The developed image is transferred to a permanent substrate and fixed thereto.

Magnetic imaging apparatus and method wherein a latent magnetic image is created on a magnetizable imaging member comprising a base or web containing a magnetizable component and wherein said imaging member has an overcoating of an electroconductive material. After development of the latent image with amagnetic toner composition, the developed image is transferred by pressure contact to a receiving substrate and fixed thereto. The imaging member provides substantially improved adhesive properties and efficient transfer of the toner particles to the receiving substrate.

A process of forming an image of toner on a latent magnetic image in a magnetic imaging member (15) followed by transfer to a heated transfer member (21) formed of a backing sheet coated with water-soluble polymer. The toner image is then transferred to a substrate using heat and pressure, the backing sheet portion of the transfer member (21) is then stripped away and the water-soluble polymer is washed away with water. The surface portion of the substrate not protected by the transferred resist toner image can then be permanently modified, as by etching or plating. Chemically milled shapes can be prepared as well as printed circuits and printing plates.

An easily assemblable transverse magnetic printing head and method for making same are disclosed for use in a coincident current, matrix-driven, transverse printing head. In accordance with one embodiment of the present invention, digit lines pass through a recording gap in mirror image fashion as between adjacent word groupings. Similarly, the word line patterns are arranged on a printed circuit board in a zig-zag fashion. A feature common to both the word and digit line printed circuits, however, is the presence of a small expanse of circuit wiring unsupported by printed circuit substrate material through which a high permeability magnetic comb structure is inserted to form required recording gaps. The coincident current scheme is retained by driving the digit lines from alternating directions. The arrangement of the digit lines in the present invention permits the use of a planar printed circuit with no crossovers and therefore a circuit which is easily fabricated in a flexible, printed circuit design.

A process of forming an image of toner on a latent magnetic image in a magnetic member followed by direct transfer to and coalescence on a surface to form a resist is disclosed. The surface portion not protected by the transferred resist toner image is then permanently modified by etching or plating. Chemically milled shapes are prepared as well as printed circuits and printing plates. The printed circuits may be formed by (1) etching away areas of a metal surface not protected by the resist, (2) electroless plating on areas not protected by the resist or (3) electroplating areas of a metal surface not protected by the resist, removing the resist, and in the case of (2) and (3), etching away the metal previously covered by the resist. An especially useful toner which forms a resist composition comprises a binder of thermoplastic resin and plasticizer and magnetic material present in the binder, compounded to have a tack transfer temperature of no greater than 110°C.

This application is a continuation-in-part of pending application Serial No. 890,973 filed 25 March 28, 1978 by the same inventors.

Process for transferring a powder image (2) which has been formed with magnetically attractable developing powder, which process comprises the steps of magnetically transferring the powder image (2) to an intermediate receiving member (4) comprising zones of a first material, separated from each other by a second material, in which either the first or the second material is magnetizable and the other material is non-magnetizable, and subsequently transferring the powder image (2) from the intermediate receiving member (4) to a final receiving material (9). The magnetizable material present on the intermediate receiving member (4) may be a material having no remanent magnetism, but in a preferred embodiment thin material has a remanent magnetism of at least 2 kA/m. Transfer of the powder image (2) to the intermediate receiving member (4) is effected by magnetizing the powder image (2) or the magnetizable zones of the intermediate receiving member (4) and contacting the powder image (2) with the receiving member (4).