Apparatus to dry/heat treat continuous web stock of film
AssigneeThe Dow Chemical Company
InventorsThuan P. Dixit, Paul T. Louks
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Abstract
An apparatus for the constrained drying and/or heat treating of a continuous or roll of, web stock of film. This apparatus includes a mechanism which grasps a film by its edges and moves said film through a drying zone, with said mechanism holding said film taut without substantial stretching of said film in the drying zone, and a means to remove the evaporated solvent from said apparatus. The apparatus is particularly useful for drying film of polybenzoxazole, polybenzothiazole and copolymers thereof, as well as molecular composite films. A method of drying/heat treating film is also disclosed.
Claims17
An apparatus for exposing a continuous web stock of film which contains a solvent to a heated gas for the purpose of separating the solvent from the film comprising
- a) a mechanism which grasps a film by its edges, with said mechanism being at least two rows of parallel pressure plated on one side of the film and at least two rows of parallel pressure plates on the other side of the film, with said pressure plates on opposite sides of said film being aligned in opposition to each other, and where said mechanism operates to move said film through a
- b) drying zone, wherein said drying zone is created by inclusion of a heating element within the apparatus and with said pressure plates holding said film taut without penetrating the film and without causing substantial stretching of said film in the drying zone, and
- c) a means to remove the solvent which is separated from the film in the drying zone from said apparatus.
Dependencies are inferred from the claim text.