Continuous solid state web coating process
AssigneeKoslow Technologies Corporation
InventorsEvan E. Koslow, Richard D. Kendrick, Gordon Spilkin
Life of this patent
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Abstract
One or more particulate active agents are fused to the surface of a substrate web by mixing the particulate agents with a particulate binder having a particle size not exceeding an average diameter of approximately 40 microns and coating the composite mixture onto the surface of the substrate. Thereafter, the coated substrate is heated to a temperature equal to or greater than the Vicat softening temperature of the binder and compressed within the nip of a pair of pressure rolls to achieve fusion. If desired, a top layer may be placed upon the coated composite prior to the compression step. Also disclosed are various products manufactured by the process.
Claims15
A process for coating the surface of a substrate web with an active agent and a binder which comprises:
- preparing a mixture of at least one particulate active agent and a particulate binder material having an average particle size not exceeding approximately 40 microns;
- applying the mixture to said substrate web to produce a uniform or textured surface of powder covering the substrate web;
- heating the powder to at least the Vicat softening temperature of said binder material but below the melting temperature of the substrate web and said active agent;
- and
- thereafter applying pressure to said substrate web to cause the softened binder material to fuse said particulate active agent particles to each other and to said substrate web to form a surface coated substrate web.
Dependencies are inferred from the claim text.