D - Textiles – Paper – 01 – D
Patent
D - Textiles, Paper
01
D
18/544
D01D 5/26 (2006.01)
Patent
CA 1200355
ABSTRACT OF THE INVENTION Relatively long plastic microfilaments made from a plastic composition are described. The plastic micro- filaments may be used to make reinforcing, filler materials and fabrics. The microfilaments are made by forming a liquid film of plastic across a coaxial blowing nozzle 5, applying a blowing gas 10 at a positive pressure on the inner surface of the plastic film to blow the film and form an elongated hollow tube or cylinder shaped liquid film 12 of plastic. Means are provided for forming a thinned wall or weakened portion of the plastic film forming the wall of the elongated tube or cylinder. A transverse jet 13 is used to direct an entraining fluid 14 over and around the blowing nozzle 5 at an angle to the axis of the blowing nozzle. The entraining fluid 14 as it passes over and around the blowing nozzle 5 fluid dynamically induces a pulsating or fluctuating pressure filed at the opposite or lee side of the blowing nozzle in the wake or shadow of the coaxial blowing nozzle and produces a laminar flow of entraining fluid in the vicinity of the forming elongated tube or cylinder. The continued movement of the entraining fluid 14 over the elongated tube or cylinder 12 produces asymmetric fluid drag forces on the tube or cylinder, and at the thinned walled or weakened wall portion longitud- inally breaks the tube or cylinder to form a multiplicity of plastic microfilaments, and detaches the plastic mic- rofilaments from the elongated tube or cylinder and from the coaxial blowing nozzle and the detached microfilaments are carried away from the blowing nozzle. Quench nozzles 18 where the plastic is thermo- plastic and heating nozzles where the plastic is thermosetting may be disposed below and on either side of the blowing nozzle 5 to direct cooling fluid or heating fluid 19 at and into contact with the plastic micro- filaments 17 to cool or heat and cure, solidify and harden the plastic to form hard, smooth plastic micro- filaments 17.
416495
Borden Ladner Gervais Llp
Torobin Leonard B.
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