Evaporator With Screening for Contamination Control
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Screening members are inserted into a conventional evaporator to retain extraneous evaporant materials in the apparatus. The screening prevents excess evaporant material from being released in sheets, flakes or particulate matter during processing which causes product contamination. In the drawing, a standard evaporator 10 includes dual evaporant sources 11 and 12. A screen member 14 covers the source area as well as the shutter area 16. An isolation valve shield is covered with a screen member 20. Screen members 25 and 26 were also incorporated into the apparatus. The member 25 totally covers the collar. A screen insert is placed in the product chamber. Screening is applied to only where the area of deposition of evaporant material occurs.