B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
18/501, 117/46.2
B01J 2/02 (2006.01) B01J 13/22 (2006.01) B01J 20/28 (2006.01) B01J 35/08 (2006.01) B29C 49/00 (2006.01) B29C 49/46 (2006.01) C03B 19/10 (2006.01) C03B 37/022 (2006.01) C04B 14/24 (2006.01) C04B 20/10 (2006.01) C08J 9/32 (2006.01) F16L 59/065 (2006.01) F16L 59/08 (2006.01) F24J 2/50 (2006.01)
Patent
CA 1150017
ABSTRACT OF THE INVENTION Hollow plastic microspheres made from thermo- plastic or thermosetting plastic compositions are described. The hollow plastic microspheres are made by forming a liquid film of thermoplastic or thermo- setting plastic composition across a coaxial blowing nozzle, applying a blowing gas at a posi- tive pressure to the inner surface of the plastic film to blow the film and form an elongated cylinder shaped liquid film of plastic. A trans- verse jet is used to direct an entraining fluid over and around the blowing nozzle at an angle to the axis of the blowing nozzle. The entraining fluid as it passes over and around the blowing nozzle fluid dynamically induces a pulsating or fluctuating pressure field at the opposite or lee side of the blowing nozzle in the wake or shadow of the coaxial blowing nozzle. The continued movement of the entraining fluid over the elongated cylinder produces asymmetric fluid drag forces on the cylinder and closes and detaches the elongated cylinder from the coaxial blowing nozzle and the detached cylinder by the action of surface tension forms into a spherical shape. Quench nozzles where the plastic is thermo- plastic and heating nozzles where the plastic is thermosetting are disposed below and on either side of the blowing nozzle and direct cooling fluid or heating fluid at and into contact with the plastic microspheres to rapidly cool or heat and cure, solidify and harden the plastic to form hard, smooth hollow plastic microspheres.
334619
Borden Ladner Gervais Llp
Torobin Leonard B.
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