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PC Molding System Components

Nordson Xaloy PC Molding System Includes Screw, Barrel, Valve, and Endcap that Are Specially Designed to Prevent Yellowing and Minimize Development of Black Specks

NECKARSULM, GERMANY, August 3, 2015: A plasticizing system that combines special component designs and flow surfaces helps injection molders of optical-grade polycarbonate (PC), acrylic, and similar polymers to produce high-clarity, enhanced-quality parts, it was announced today by Nordson Corporation, which will introduce the system at Fakuma 2015 (Hall A6, Stand A6-6404).

The Nordson Xaloy PC Molding System addresses common challenges encountered in molding optical-grade polymer by delivering a homogeneous melt with a minimum level of the shear that can cause yellowness or discoloration in PC; and by avoiding polymer sticking points or “dead” spots where blemishes such as black specks can form. Nordson recommends the system for processing lens-grade or colored PC for automotive lighting, eyeglasses, optical disks, and electrical and telecommunications components.

“The Nordson Xaloy PC Molding System provides superior quality in critical parts such as lenses by developing a fully homogeneous melt with optimal clarity,” said Mark Colella, Nordson Xaloy global product manager. “As a result, processors can reduce scrap and maximize productivity.”

The components of the Nordson Xaloy PC Molding System include:

---Pulsar® II Mixing Screw Modified for Polycarbonate. Nordson has developed a version of the Xaloy Pulsar screw whose design minimizes the color degradation of PC caused by shear during mixing and prevents the sticking of material at sites on the screw where specks can form.

---Barrel with X-800® Inlay. Composed of a nickel-based alloy with tungsten carbide, the X-800 inlay provides an especially hard surface with release properties that prevent polymer from sticking to the barrel.

---Valve for Free-Flowing Melt Delivery. Nordson provides a valve with internal geometry designed for PC viscosity and recommends different valve types for screw diameters less than 80 mm, screw diameters greater than 80 mm, and flame retardant compounds, respectively. Valves with DyClad™ hard chrome plating are available to provide extra-hard, frictionless surfaces.

---Nickel-plated end cap designed to smoothly transition the PC melt from the screw to the injection nozzle.


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. Visit Nordson on the web at, @Nordson_Corp, or

Nordson Polymer Processing Systems provides customers with engineered components to melt, homogenize, filter, meter, 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. To learn more visit us at