| abstract |
Capsules, for example for the delivery of pharmaceuticals, are produced from two films of a water-soluble polymeric material, by deforming the films to form a multiplicity of recesses, and filling the recesses with a flowable filling material. The films are then welded together by dielectric welding to form filled capsules, which are cut or punched out of the welded film. These steps may be performed at a single location so as to avoid any problems with registration of the recesses with the welding or cutting means. The polymeric material may be gelatin, or a water-soluble cellulose derivative such as hydroxypropyl methyl cellulose, and may also contain a plasticiser. |