Thermoplastic foam is converted into useful products by simultaneously compressing and agitating particles of the foam. The particles are formed into a substantially unitary mass of hot softened material which can be immediately formed, cast or extruded into useful particles.
Walterville Elementary School Springfield OR 1955-1958, Leaburg Elementary School Springfield OR 1958-1961, Thurston Middle School Springfield OR 1961-1964
Community:
Penny Elmenhurst, Penny Davenport, Terry Craddock, Lila Williams