Method and apparatus for dispensing liquid compositions
First Claim
1. An apparatus for dispensing foam coating compositions comprisinga container for storing liquid composition comprising a film-forming solid,means for transferring a portion of said liquid composition to a separate loop maintained under pressure for circulating said liquid portion mixed with a blowing agent,means for separately supplying the blowing agent to said loop,a single unit for coincidentally heating and mixing said liquid composition and blowing agent mixture in said loop at a temperature above the foaming point of said blowing agent, said composition being maintained under pressure in said loop, said single unit including a means in the loop for imparting heat to said liquid mixture and baffles for causing mixing of said liquid mixture, andmeans for selectively dispensing the composition from the circulating loop to normal atmospheric conditions for foaming said composition and forming a coating upon a substrate with said film-forming solids.
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Accused Products
Abstract
A method and apparatus for dispensing liquid compositions. The apparatus includes a reservoir for containing the liquid at a low temperature, a metering device for transferring the liquid to a circulating loop at a higher temperature, a heater/mixer for coincidentally heating and mixing the liquid in the loop and means for dispensing the liquid from the loop. The invention is particularly useful for dispensing liquid adhesive and coating compositions, including thermosetting polymers, heat sensitive polymers or plastisols and other dispersed liquid systems. In addition, mixtures of polymeric liquids with other components such as gases, solvents or liquid blowing agents may be employed with uniformity of composition for dispensing foams or atomizable paints.
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Citations
17 Claims
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1. An apparatus for dispensing foam coating compositions comprising
a container for storing liquid composition comprising a film-forming solid, means for transferring a portion of said liquid composition to a separate loop maintained under pressure for circulating said liquid portion mixed with a blowing agent, means for separately supplying the blowing agent to said loop, a single unit for coincidentally heating and mixing said liquid composition and blowing agent mixture in said loop at a temperature above the foaming point of said blowing agent, said composition being maintained under pressure in said loop, said single unit including a means in the loop for imparting heat to said liquid mixture and baffles for causing mixing of said liquid mixture, and means for selectively dispensing the composition from the circulating loop to normal atmospheric conditions for foaming said composition and forming a coating upon a substrate with said film-forming solids.
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6. A method for dispensing solvent-coating compositions comprising
providing a liquid composition comprising a solvent and film-forming solids, transferring a portion of said liquid composition to a separate loop maintained under pressure for circulating said liquid portion, separately metering said solvent and said film-forming solids of said composition to said loop, employing a single unit for coincidentally heating and mixing said liquid portion in said loop at a temperature above the normal boiling point of at least a portion of said solvent, said single unit including a means in the loop for imparting heat to said liquid portion and baffles for causing mixing of said liquid portion, maintaining said portion under pressure in its liquid state in said loop, and selectively dispensing the composition from the circulating loop to normal atmospheric conditions for evaporation of said solvent portion and for coating a substrate with said film-forming solids.
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9. A method for dispensing foam coating compositions comprising
storing a liquid composition comprising a film-forming solid, transferring a portion of said liquid composition to a separate loop maintained under pressure, separately supplying a blowing agent to said loop, circulating said liquid portion in said loop mixed with said blowing agent, employing a single unit for coincidentally heating and mixing said liquid composition and blowing agent mixture in said loop at a temperature above the foaming point of said blowing agent, said composition being maintained under pressure in said loop, said single unit including a means in the loop for imparting heat to said liquid mixture and baffles for causing mixing of said liquid mixture, selectively dispensing the composition from the circulating loop to normal atmospheric conditions for foaming said composition, and forming a coating upon a substrate with the dispensed film-forming solids.
Specification