Extrusion trials with a TSK045 twin screw extruder (Poster presentation)
conference paper
In 1994 a 45mm twin screw extruder was introduced at the Prins Maurits Laboratory of TNO for the processing of energetic materials. Initial safety experiments were carried out by using inert compositions with small amounts of different energetic components and micro encapsulated chemical sensors to simulate solventless extrusion processing.
By this approach the internal shear forces and the thermal behavior during such type of extrusion processing could be assessed. As a consequence, some limiting and verifiable processing parameters as product temperature, product pressure, drive torque were found and used to avoid hazardous situations when processing energetic materials at similar conditions. The range of encountered shear stresses within the product during processing could be measured with CAMES™-particles and these too could be related to possible hazardous conditions.
Initial processing of some PBX compositions, which cannot be processed by existing casting techniques, based on monomodal RDX and a solid loading upto 86-87 w% showed promising results. To process the same type of compositions by casting the solids level has to be reduced to the range of 70-78 wt% depending on the crystal sizes and tapdensity.
By this approach the internal shear forces and the thermal behavior during such type of extrusion processing could be assessed. As a consequence, some limiting and verifiable processing parameters as product temperature, product pressure, drive torque were found and used to avoid hazardous situations when processing energetic materials at similar conditions. The range of encountered shear stresses within the product during processing could be measured with CAMES™-particles and these too could be related to possible hazardous conditions.
Initial processing of some PBX compositions, which cannot be processed by existing casting techniques, based on monomodal RDX and a solid loading upto 86-87 w% showed promising results. To process the same type of compositions by casting the solids level has to be reduced to the range of 70-78 wt% depending on the crystal sizes and tapdensity.
TNO Identifier
183461
Source title
29th International Annual Conference of ICT. Energetic Materials: Production, Processing and Characterization, Karlsruhe, Germany, 30 June-3 July 1998
Pages
96-1 - 96-11
Files
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