| abstract |
A method for the manufacture of devices for emitting vapours of active volatile agents, in particular those which are insecticidal, insect-repellent or condition the air especially in closed spaces. Liquid containing or constituted by the active agent and a solid mass having as base a macromolecular substance other than natural cellulose are placed in a container, e.g. a sachet, which is then sealed and stored until the liquid is completely absorbed by the mass, forming a solid solution therein. The device is put in operation by opening and/or removing the container. |