Patent ID: 6589595
Filing Date: 2003-07-08
Classification: E01C

Abstract:
A method for preventing asphalt and tar from sticking to paving equipment, consisting essentially of:1) diluting a concentrate with about three to about 50 parts water to one part concentrate, 2) contemporaneously with the dilution step, spraying the diluted concentrate on the equipment prior to its coming in contact with asphalt or tar, then 3) contacting the coated equipment with asphalt or tar, then 4) releasing the asphalt or tar from the equipment, wherein the spraying is accomplished using an apparatus consisting essentially of I. a single pump and associated electric motor to drive the pump, said pump being a vaned, positive-displacement pump producing a minimum flow of about one gallon per minute at 200-300 pounds per square inch (â€œpsiâ€ ) pressure, II. a timer relay to control the pump and motor, III. an induction/injection valve with a high induction capacity yielding the mix of concentrate and water, IV. a spray gun with an appropriately-sized nozzle or spray bar with multiple nozzles, and V. necessary tubings, fittings, connections, control buttons, a box to enclose the apparatus, and optionally, ancillary devices selected from the group consisting of pressure relief valves, freeze protection, particulate-filtering screens, and a solenoid valve to prevent non-pumped release of the diluted concentrate.