Filter made of electrostatically spun fibres
First Claim
1. A fibre filter comprising a fibre fleece having an electrical charge produced by electrostatically spraying a solution of a polymer in a volatile solvent having a conductivity of 10-9 Ohm-1 cm-1 to 10-4 Ohm-1 cm-1 between an electrode wetted by the solution and a conductive support for spraying of the solution, evaporation of the solvent, and collection of the polymer as the fibre fleece on the support, the polymer being polycarbonate and the fibres of the fibre fleece having a porous surface structure, and a gas permeable support combined with the fibre fleece as support therefor.
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Abstract
In a process for the production of fibre filters, the fibre material is sprayed electrostatically from the liquid state and deposited as a fibre fleece on a conductive support. The starting materials used are solutions of high polymers in readily volatile solvents. The charged filters obtained have substantially improved properties.
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Citations
12 Claims
- 1. A fibre filter comprising a fibre fleece having an electrical charge produced by electrostatically spraying a solution of a polymer in a volatile solvent having a conductivity of 10-9 Ohm-1 cm-1 to 10-4 Ohm-1 cm-1 between an electrode wetted by the solution and a conductive support for spraying of the solution, evaporation of the solvent, and collection of the polymer as the fibre fleece on the support, the polymer being polycarbonate and the fibres of the fibre fleece having a porous surface structure, and a gas permeable support combined with the fibre fleece as support therefor.
Specification