D - Textiles – Paper – 01 – D
Patent
D - Textiles, Paper
01
D
D01D 5/11 (2006.01) D01F 6/04 (2006.01)
Patent
CA 2102578
A continuous process for the manufacture of strong discontinuous fibres from a polyolefin is disclosed. The process comprises feeding a solution of polyolefin dissolved in an organic solvent at a pressure that is at least autogenous pressure to a spinneret. Plexifilamentary film-fibril strands are formed by flash spinning, by passing said solution through the exit of the spinneret and into a tunnel at a lower pressure and temperature than the solution, the temperature being greater than the boiling point of the organic solvent. At or subsequent to the exit from the spinneret but inside the tunnel, the strands and solvent are contacted in the tunnel with an inert fluid that has a liquid and a vapour phase, the amount of inert fluid being such that the ratio of the total volumetric flow rate of solvent vapour plus inert fluid vapour to the mass flow rate of the polymer is greater than 4.5 m3/kg in the tunnel. The temperature of the inert fluid in the tunnel is 2-40°C lower than the melting point of the polymer. Strong discontinuous fibres are recovered. The fibres, especially in the form of a pulp, may be used as part of thermally bonded blends with cellulose, as a filler and in the form of sheet.
Cloutier Sylvie
Manuel Lynne M.
Zboril Vaclav George
Dimock Stratton Llp
Du Pont Canada Inc.
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