MACHINERY | LAB COMPOUNDERS
screw geometry’s combined functions of melting the polymer, wetting the additive particles, and delivering distributive and dispersive mixing in one process. “In some applications this configuration enables formulations of 60% polymer compound- ed with 20% mineral powder and 20% short glass fibres via one side opening,” the company claims. The Y-shaped funnel concept provides optimal
Above: Production of micro-pellets at a laboratory scale can be challenging. Feddem says its curved FSK die heads, which carry up to 11 die holes, ease separation as the strands enter the water bath
supplied in an explosion-proof version. The integrated model has the control cabinet incorpo- rated into its frame to reduce installation space and installation time, which limits the L/D ratio to a maximum of 52.5. Configurations for screws and barrel are customisable on both variants. Germany-based Feddem says its Y-shaped funnel concept, which has proven itself in its production lines and can eliminate the need for a second side feeder, is now available on the laboratory compounding lines it produces. The company says screw geometries using
combinations of its FME-type mixing elements allow for simultaneous addition of powdered additives and short glass fibres through a single side opening in the extruder. This is due to the
control of the powder and glass fibre feed by taking up the two feed streams at the discharge pipe of each metering feeder and guiding the material into the inlet opening of the extruder’s side feeder. The feed streams are maintained separately until shortly before they enter the feed zone of the side feeder’s conveying screws. According to Feddem, the Y-shape of the funnel brings considerable advantages. Dust pollution around the side feed port is kept to the minimum, the company says, while the Y-shape funnel is considerably more compact than a conventional hopper. This means space limitations above the side feeder’s feed port are eased and metering feeders can be placed for optimal access for reconfiguration and maintenance. “This is a tremendous benefit, especially in laboratory setups,” says the company.
Venting option Feddem says its FSE side venting concept, used for applications involving processing of low bulk density powders, is also now available for its laboratory extruders. The FSE concept actively reduces dust emissions when adding such addi- tives. “In these applications, the stream of exhaust air from the compaction process during side
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IMAGE: FEDDEM
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