Patent ID: 9744695
Date: 2017-08-29
CPC Classifications: B29C,B29K,C08J,C11D,Y10T

Claim:
1. A process for the manufacture of a water soluble film with at least one embedded active material, the method comprising the steps of: i) taking up an elongate liner from a liner source; ii) providing a formulation for a water soluble film comprising at least one active material; the at least one active material being selected from the group consisting of detergents, enzymes, softeners, perfumes, pesticides, fungicides, active ingredients, dyes, pigments, hazardous chemicals, active agents for cleaning laundry, dishes, floorings, and walls, and combinations thereof; iii) casting a solution of the formulation with said at least one active material from step (ii) on the elongate liner to form an elongate water soluble film on said elongate liner with said at least one active material physically incorporated in the water soluble film such that the active material is embedded in the water soluble film; iv) drying the cast water soluble film with said at least one active material embedded and physically incorporated in said water soluble film on said elongate liner; v) rewinding the liner on a collector either with or without the water soluble film adhered to the liner; and vi) casting a solution of a formulation for at least one further water soluble film on the embedded water soluble film from step (iv) at a subsequent casting head and drying the multi-layer water soluble film to produce a multi-layer water soluble substrate.