The density of the composites plateaued about 190[degrees]C and 5.17 MPa, indicating that closed compression molding
produces sufficient pressure for full consolidation.
The lower impact strength of the extruded followed by compression molding
material versus the compression molding
material suggests that cross-linking of cellulose acetate with TEC may have occurred during the melt extrusion processing, which exposes the material to shear stresses during processing.
The compression molding
process was carried out at a melt temperature of 160 [degrees] C for neat and 20% talc-filled HDPE and PP and 310 [degrees] C for neat and 20% talc-filled PPS.
PrimoSpire PR-120 is for compression molding
and extrusion; PR-250 is for injection molding and extrusion.
It was found that the thermomechanical history during injection compression molding
(ICM) process forms a quadrilateral-shaped path with the atmosphere isobar in the P-v-T diagram, with all three sides controllable by pressure.
Even with a preheated blank, compression molding
in a conventional oil-heated tool reportedly would take much longer.
The presses are said to be ideal for compression molding
of rubber/elastomers, gum silicones, various TPEs, thermosets and plastics.
Designs and builds unscrewing molds, cam-action molds, stack molds, hot-runner molds, collapsing-core molds, tamper-evident closure molds and compression molding
The semi-permanent, water-based mold release coatings are designed for the injection, transfer and compression molding
of rubber parts.
The nylon takes roughly 3 min to polymerize--longer than melt-forming processes such as compression molding
, but polymerization takes place at a lower temperature (300 F), so parts demold faster.
They are said to be ideal for compression molding
rubber/elastomers, gum silicones, various TPEs, thermosets and plastic.