Glycon cuts prices on its DM2 screws
Glycon Corp. is lowering prices for its DM2-brand feed screws based on the ET design, since the original patent now has expired.
Screw designer Robert Barr developed and patented the ET screw in 1982. The screw produces 15-20 percent more output that a typical barrier screw, with 25 percent less shear, Glycon said. Now Tecumseh, Mich.-based Glycon will provide all current ET configurations, as well as new designs for extrusion and blow molding.
``For the last 18 years, Glycon has held the exclusive license to produce these screws for injection molding applications,'' said Glycon President Jeffrey Kuhman. ``Now that patent protection has run out, we'll be able to deliver the exact same screws at prices that are 30-40 percent lower.''
Instead of using high shear, where the screw forces the resin against the barrel wall, the DM2 screw has a thermal crossover zone positioned along the screw at a point where 70-80 percent of the polymer is melted. The configuration of channels and undercut flights allows the melt, as well as unmelted pellets, to interact without excessive pressure buildup. As the plastic crosses over the undercut flights, it tumbles into the next channel. The crossover is repeated several times, providing a dynamic melting action similar to that of twin-screw extruders.
Tel. (800) 255-9969, fax (517) 423-7470.
Nitrogen gas takes heat out of profiles
An Illinois company uses nitrogen gas - instead of straight cooling water - to take the heat out of extruded profiles.
Material Enhancement Inc. of Effingham, Ill., calls its patent-pending technology the Cryogenic Extrusion Chiller System. The system converts liquid nitrogen to a gas, in the process capturing a refrigerant, which flows through a distribution system and circulates at a high volume.
A microprocessor controls the heat-exchange rate to the cool nitrogen gas, preventing thermal shock to the profile.
According to MEI, the profiles retain impact properties and dimensional tolerances, while maintaining a high extrusion speed and cooling rate - from 50-200 percent faster on rigid profiles and up to five times faster on foam and wood composites.
MEI said the cryogenic system can replace an entire downstream cooling system, although the company typically recommends running conventional water cooling for the vacuum calibration part of the process.
The company also has extrusion systems that can be added onto an existing downstream water-cooling system, to give extra cooling capability.
Tel. (217) 347-2901, fax (217) 347-3378.
Athena aims Tri-Zone at small customers
Athena Controls Inc. introduced its Tri-Zone, a portable hot-runner controller mainframe compatible with any Athena series IMP, RMB, RMC or other hot-runner controller designed to fit standard vertical mainframes.
Tri-Zone is suited for small molders or customers that otherwise would have to use a five-zone mainframe and blanking panels for the two empty slots.
List price is $425, said the company in Plymouth Meeting, Pa.
Tel. (610) 828-2490, fax (610) 828-7084.
B&H crosshead die coextrudes on 1 core
B&H Tool Co. Inc. of San Marcos, Calif., has a dual-layer coextrusion crosshead die, called the BH2L5010, for extruding two similar materials over the same core.
The crosshead die is designed for extruding wire and cable, medical and industrial tubing, and agricultural automotive parts.
Tel. (800) 272-8878.
Left Hook targeting injection machines
The Left Hook, a patented mixing element from Scientific Process & Research Inc., now can be used in injection molding machines.
Ron Klein, president of the firm in North Brunswick, N.J., originally developed the Left Hook for blow molding and extrusion. Now the mixing section can be milled into an injection screw.
The Left Hook maximizes melt homogeneity to virtually eliminate unmelted material and improve dispersion of color, additives and dissimilar resin blends, while operating at lower melt temperatures with low shear.
The mixer creates a continuous, cascading action that gives a high degree of turbulence without excessive shear.
Tel. (732) 846-3477, fax (732) 846-3029, e-mail [email protected]
Nissei's all-electric molds electronic parts
Nissei Plastic Industrial Co. Ltd. has developed a special all-electric injection press, replacing a Nissei hydraulic press, for molding large, light guide plates for notebook computers and other large electronic products.
Nissei also made a special mold to produce the very thin, mirror-surface parts, which are used inside of a back-light unit that leads the light to liquid crystals in a liquid crystal display. The guides can measure 15 inches across.
The all-electric press uses two servomotors for injection and mold clamping. A ball screw and servomotor are tied directly to a driving servomotor.
A newly designed screw, a high-quality barrel and a temperature-control system uniformly melts and holds the resin.
Nissei of Nagano, Japan, said the all-electric press can mold the large, light guide plates on a cycle of less than 30 seconds, vs. 50-70 seconds on a hydraulic press.
Nissei America Inc. is based in Anaheim, Calif.
Tel. (714) 693-3000, fax (714) 693-7777, e-mail [email protected]
MLC6 controller works with Conair's loaders
Conair Group of Pittsburgh said its MLC6 loader controls work with its DustBeater and Z Loader, creating a new range of discrete loader controls that are accurate, repeatable and easy to use.
The MLC6 has a 16-character readout that tells users exactly what is happening, in plain language.
Gone are the sometimes-confusing indicator lights and coded readouts of earlier controllers. Under alarm conditions, the loader not only indicates an alarm with a panel-mounted light, but also tells you the reason for the alarm and pinpoints the exact problem, with a message like ``fill sensor unsatisfied.''
Conair said an optional audible alarm is available.
A push-button screen replaces knobs, to provide digital accuracy.
Conair said the follow-up to the MLC6 will be Selectronic 6 units, distributed input/output control systems designed to provide local control of loader/receivers in a central vacuum system.
MLC6 controllers come standard with new Conair self-contained loaders. They can be retrofitted to earlier generations of Conair loaders.
Tel. (412) 312-6000, fax (412) 312-6320.