| 摘要 |
<p>Improved apparatus and method for continuously producing high sensitivity magnetochemical particles consisting of joined pairs of pre-oriented magnetic metallic sphere which have been heat treated, magnetically appealed, then plated with color forming metals and overcoated with a chemically resistant coating. These spheres are vibratorially and frictionally seated in surface dimples impressed on the opposed surfaces of a film formed in a mobius loop. The dimples are formed in back-to-back registry by passing the film material through mirror image halftone screen carrying impressing cylinders. A resin coating applied to the surface of the film loop encases and binds the spheres into mirror image groups and while the resin coating is still fluid, a directional magnetic field is applied to rotate and orient the encased spheres so that their preferred directions for magnetic field propagation are to the surface of the film loop. The resin coating is dried, then adhosed to a take-off film which strips the resin coating, dimple projections, and encased spheres from the mobius loop film surface. The dimple projection surfaces are then abraded to cut through the resin and magnetic are spheres and expose color forming metal surface areas which are then tinned with solder. Two mirror image portions of the take-off film with solder tinned resin projections are then assembled so that they are in mirror image confronting relationship with the tinned surfaces of confronting spheres engaged. By the application of heat, the solder is melted and the spheres thus soldered together to form connected spheres. The take-off films are now stripped away, and the resin material dissolved in a solvent from which by decanting and washing high sensitivity magnetochemical particles are recovered.</p> |
