A high-rate plasticizing unit incorporating an innovative screw design produces enhanced-quality melt at rates that make possible shorter cycles in injection molding of high-speed, thin-wall packaging, it was announced today by Nordson Corporation, which will introduce the system at NPE2015 (Booth W6263).
The Nordson Xaloy Quantum™ plasticizing system includes a barrier screw designed to increase the rate of plastication for unmelted material while minimizing 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 plasticizing 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. “As a result, molders who use the Quantum processing system are often able to reduce cycle times, increasing profitability and yielding a rapid return on investment.”
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 maximized, increasing the plastication rate. “In the screw for the Quantum system, we strive for a mass balance throughout the length of the screw, accommodating the differential between the bulk density of the pellets being fed into the system and the density of the molten polymer,” said Mr. Genova.
Nordson custom designs each screw for the Nordson Xaloy plasticizing system to meet specific customer requirements.
Nordson Corporation engineers, manufactures and markets differentiated products and systems used for the precision dispensing of adhesives, coatings, sealants, biomaterials, polymers, plastics and other materials, fluid management, test and inspection, UV curing and plasma surface treatment, all supported by application expertise and direct global sales and service. Nordson serves a wide variety of consumer non-durable, durable and technology end markets including packaging, nonwovens, electronics, medical, appliances, energy, transportation, construction, and general product assembly and finishing. Founded in 1954 and headquartered in Westlake, Ohio, the company has operations and support offices in more than 30 countries.
Nordson Polymer Processing Systems provides customers with engineered components to melt, homogenize, dispense, and give shape to plastic and fluid coating materials. Nordson Corporation leverages the collective plastics industry experience from a series of strategic acquisitions to offer a uniquely broad portfolio of industry-leading technologies. Nordson delivers a full range of precision melt stream products — from screws and barrels for extrusion and injection molding — to filtration systems, pumps, and valves — to the extrusion dies and pelletizing systems to meet the constantly evolving needs of the polymer industry.
Nordson Corporation provides customers with local technical sales, service and remanufacturing capabilities through sales organizations and regional manufacturing facilities in over 30 countries.