Solvay & Cie

Georges Voituron

Carlo Raganato

Jean-Pierre Pleska

A process for the production of polypropylene fibrids of short length by abrupt expansion of a liquid mixture of molten polypropylene, an alkane solvent for the polypropylene, and a minor amount of a non-solvent for the polypropylene. The mixture, which is at a high temperature and high pressure, is ejected through an expansion orifice to instantaneously vaporize the alkane and to solidify the polypropylene.

Process for the production of polypropylene fibrids

A continuous fibrillated structure, formed by the abrupt pressure release of a two-phase liquid mixture of polymer and solvent at elevated temperature and pressure so as to cause the instantaneous vaporization of the solvent, is shredded by a stream of fluid directed transversely against the continuous fibrillated structure at the moment of its formation.

Process for the manufacture of discontinuous fibrils

A continuous fibrillated structure, formed by the abrupt pressure release of a two-phase liquid mixture of polymer and solvent at elevated temperature and pressure so as to cause the instantaneous vaporization of the solvent, is shredded by introducing a make-up fluid into the two-phase liquid mixture before the pressure release is complete.

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Vilvoorde, Belgium

Georges Voituron