Plastic and nonmetallic article shaping or treating: processes – Treatment of material by vibrating – jarring – or agitating...
Patent
1980-06-19
1981-12-01
Lindsay, Jr., Robert L.
Plastic and nonmetallic article shaping or treating: processes
Treatment of material by vibrating, jarring, or agitating...
65 22, 65142, 264129, 264514, 264574, 264DIG6, 425 7, 425462, 65 214, 65 604, B29D 904
Patent
active
043036031
ABSTRACT:
Hollow plastic microspheres made from thermoplastic or thermosetting plastic compositions are described.
The hollow plastic microspheres are made by forming a liquid film of thermoplastic or thermosetting plastic composition across a coaxial blowing nozzle, applying a blowing gas at a positive pressure to the inner surface of the plastic film to blow the film and form an elongated cylinder shaped liquid film of plastic. A transverse 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 thermoplastic 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.
The hollow plastic microspheres can be used as filler materials in plastics, in plastic foam compositions and in concrete and asphalt compositions. The hollow plastic microspheres can be made from low heat conductivity plastic compositions and blown with a low heat conductivity gas and used to make improved insulation materials and composites and insulating systems.
The hollow plastic microspheres can be made to contain a thin transparent or reflective metal coating deposited on the inner wall surface of the microspheres by adding to the blowing gas small dispersed metal particles and/or gases or organo metal compounds and decomposing the organo metal compounds.
The hollow plastic microspheres can also be made in the form of filamented plastic microspheres with a thin plastic filament connecting adjacent plastic microspheres.
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Carvellas Perry
Lindsay, Jr. Robert L.
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