The test articles were then allowed to
devolatilize for 24 hours.
With the wood fully encapsulated in the plastic, maximum vacuum can be drawn at the vent zone to effectively
devolatilize the melt without drawing dry wood fiber through the vacuum system.
TGA experiments show also that oil shale does not
devolatilize completely until temperatures of about 540([+ or -] 10) [degrees]C are reached.
Twin screw extrusion systems are said to continuously mix and
devolatilize polymers with fillers and additives in combination with direct wire coating extrusion.
The temperature throughout the extruder was maintained at 180[degrees]C for zones 1-3, to thoroughly
devolatilize the extrudate.
The twin-screw extruder can also be used to compound, react,
devolatilize, and--in one step--directly extrude a finished product such as film/sheet, fibers, profiles, and other special-purpose parts.
It also supplies such specialized reactive compounding equipment as three- or four-screw "vent staffers." These are feeders that
devolatilize ingredients while feeding.
The TGA results suggest that different constituents of wood
devolatilize at different temperatures.
A new series at twin-screw extrusion systems from Leistritz is designed to continuously mix and
devolatilize polymers with fillers and additives in combination with direct wire-coating extrusion.
An additional downstream vent is required to
devolatilize natural fibers.
Methanol was suggested as volatile component to
devolatilize styrene or styrene/acrylonitrile polymer under subatmospheric pressure, reducing the residual monomer content (87).
These extruders can be used to compound, react,
devolatilize, and in one step directly extrude a finish product, such as film/sheet, fiber, or profiles.