Patent ID: 6316053
Filing Date: 2001-11-13
Classification: B01F,B29B,B29K,F16K,Y10T

Abstract:
A method of coloring polyurethane slabstock foam comprising the steps of(a) providing a slabstock foam producing composition;(b) introducing a liquid colorant into a valve assembly including a ball valve, an inlet feed line, a dispensing feed line, and a recirculating feed line;wherein said ball valve has first and second channels;wherein each channel is exclusive of the other;wherein said first channel has a first opening and a second opening, both of which are located at different locations on the ball valve surface;wherein said second channel has a first opening and a second opening, both of which are located at different locations on the ball valve surface;wherein said inlet feed line transfers liquid into said valve assembly;wherein said valve assembly is oriented either to transfer liquid into said dispensing feed line or into said recirculation feed line; andwherein said recirculation feed line is oriented to transfer any liquid transferred thereto back to said inlet feed line;(c) introducing the liquid colorant from within the valve assembly of step ""b"" through said dispensing feed line into the slabstock foam producing composition of step ""a"".