Nordson Corporation announced a high-rate plasticising unit incorporating an innovative screw design produces enhanced-quality melt at rates that make possible shorter cycles in injection moulding of high-speed, thin-wall packaging, which will be introduced at NPE2015.
The Nordson XALOY Quantumâ„¢ plasticising system includes a barrier screw designed to increase the rate of plastication for unmelted material while minimising shear forces on polymer that is already in a molten state. Along with the innovative screw, Nordson supplies a custom-designed poppet-style non-return valve, whose free-flowing channels prevent polymer degradation and whose rapid shut-off ensures shot-to-shot consistency.
“The Quantum system delivers optimum melt quality at a rate that reduces actual screw recovery time by 10 to 15% in comparison with existing high-performance plasticising units, enabling it to keep pace with the exceedingly short cooling times in high-volume production of thin-wall parts”, said Tony Genova, engineering supervisor for screw manufacture. A barrier screw has a middle section designed to separate solids from molten polymer so that the heat and shear forces applied to the solids can be maximised, increasing the plastication rate.
Nordson custom designs each screw for the Nordson XALOY plasticising system to meet specific customer requirements.