Patent ID: 6541531
Filing Date: 2003-04-01
Classification: B01F,B29B,B29K

Abstract:
A method of controlled introduction of additives within a polyurethane slabstock foam producing system utilizing a liquid dosing assembly comprising a ball valve, a feed line, and a liquid collecting vessel; wherein said feed line acts as a transport conduit between said ball valve and said liquid collecting vessel; wherein, said liquid dosing assembly exhibits substantially no leakage of a liquid from the feed line into the liquid collecting vessel when said ball valve is oriented in the closed position, substantially all of said liquid is retained within said feed line at the moment said ball valve is oriented in the closed position, and, upon reorientation of said ball valve from the closed to the open position, said liquid instantaneously moves into the liquid collecting vessel; said method comprising the steps of(a) providing a liquid polyol within said collecting vessel; (b) introducing at least one liquid additive from the group consisting of at least one dye, at least one pigment, at least one polymeric colorant, at least one catalyst, at least one surfactant, at least one flame retardant, water, and any mixtures thereof, into said collecting vessel through said feed line to form a resultant mixture of said liquid polyol and said at least one liquid additive.