Mechanically frothed plastisols
AssigneeRutland Plastic Technologies, Inc.
InventorRobert C. Bergvist
Life of this patent
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Abstract
An improved process for production and delivery of a plastisol foam is provided. By the process, plastisol foam is maintained under controlled pressures and conditioned to enhance homogeneity and percent foam. Also provided is a process for intermittently dispensing a fluid such as a plastisol foam, by which drip may be prevented. Additionally provided is novel apparatus for preventing drip.
Claims17
A process for production and delivery of a plastisol foam comprising mechanically frothing a plastisol under a pressure in excess of atmospheric pressure;
- while maintaining the resulting raw foam under a pressure in excess of atmospheric pressure, introducing the raw foam into a suitable container;
- thereafter, conditioning said raw foam by agitation and under a pressure in excess of the vapor pressure of the foam;
- maintaining the foam under a pressure in excess of said vapor pressure, until the foam is dispensed;
- and dispensing a conditioned, pressurized foam.
A process for intermittently dispensing a fluid, comprising preventing drip from a dispensing head by application of negative pressure from a piston-actuated, vacuum cylinder subsequent to said dispensing.
Dependencies are inferred from the claim text.