Examples of preventive-maintenance monitoring include vibration, oil composition, motor parameters, heater status, screw wear and energy consumption. As part of this package, the line will feature Davis-Standard’s latest drive technology to provide notification of potential drive issues. The 2.5-in. Thermatic is an upgraded model with enhancements in gearbox design, barrel cooling and vent-diverter geometry.
D-S will also be showing a next-generation 2.5-in., direct-drive, grooved-feed extruder featuring its proprietary Helibar design. This machine has a grooved intake zone and helically grooved barrel, along with new barrier-mixing screw technology. This barrel and screw combination offers increased processing flexibility due improved pressure stability and tolerance for higher regrind levels. It also enables processing of a wider range of polymers at lower pressure and with improved energy efficiency.
The Helibar design is also said to be advantageous in terms of higher throughput, improved melt-pressure buildup, lower melt temperatures, improved melt homogeneity, reduced barrel wear, and shorter residence time. This extruder is said to be suited for pipe, profile, sheet, and blow molding.
The Super Blue extruder line will also be featured at the show. D-S says this extruder series offers processors the ability to switch among D-S feedscrews while offering a low-noise, a double-reduction gearbox, minimal maintenance, and consistent production rates. It is available in sizes from 2 to 4.5 in., each with the option of a 24:1 or 30:1 L/D. At NPE2018, the Super Blue will be equipped with the DS-eTPC II, the second generation of Davis-Standard’s touchscreen control.
This controller is aimed at pipe, profile, tubing, elastomer, wire/cable, sheet, and reclaim extrusion. Notable enhancements include a larger, 15-in. viewing screen with multi-touch capabilities for zoom-in and out, control of up to three extruders, and real-time and historical data trending.
Graham Engineering Corp. will be displaying a 2.5-in. (63.5-mm) American Kuhne Ultra extruder with XC100 Navigator control, and a 3.5-in. (99-mm) extruder with XC200 Navigator control. Graham has made improvements to its Ultra extruders to simplify maintenance. Examples are newly designed barrel covers that allow for quick and easy access to barrel heaters and thermocouples, and an automotive-style wiring harness with quick-change plugs for routing wiring and thermocouples from the electrical cabinet to the barrel-heater/cooling zones.
Navigator controls were originally developed for Graham Engineering extrusion blow molding systems and then adapted for Welex sheet extrusion lines. There are three levels of functionality: XC100 for stand-alone extruders; XC200 for one or more extruders in simultaneous operation; and XC300 for integrated production lines with the extruder and downstream components such as a puller, water bath, or winder. All three controls will be shown on American Kuhne extruders.
Graham will also display an American Kuhne three-layer medical tubing line, consisting of modular micro extruders, an American Kuhne AKcent coextruder, and XC300 Navigator with integrated TwinCAT Scope View high-speed data-acquisition system. This versatile customized system is available in fixed horizontal versions or units that can be fully tilted from horizontal to vertical. An EZ-Tilt feature makes angular adjustments quick and easy. The control panel is on located on an arm mounted to a ground post allowing the panel to swivel around the post for flexible positioning.
At its first-ever NPE, US Extruders is showing a new generation of highly engineered, custom single-screw extruders. On display will be 2.5-in., 24:1 and 3.5-in., 24:1 extruders, as well as a compact custom medical extruder. The 2.5-and 3.5-in. extruders feature a unique heater-shroud design made of individual stainless-steel shrouds that provide quick access to each zone. Dual-layer stainless steel keeps the exterior relatively cool to the touch. Thermocouples go through the side for easy replacement. Each shroud includes an adjustable exhaust deflector. Integral wireways are also built in to provide a clean look and easy access to wires.
The machines on display will also have a C-clamp with an easy-open, over-center lever and thumb-release safety lock. The lever-action swing bolt needs no wrench adjustment once the position is set. Durable aluminum heaters allow for consistent heating throughout clamp. A linkage counterbalances the two halves, so they open together. Moreover, on this extruder the motor is mounted on a pivoting base. This unusual design provides auto-adjusting tension on the V-belts. The motor mount’s pivot location is determined by the motor weight and torque reaction to constantly provide the correct tension. The feed throat is integral to the barrel with an air/water-cooled, jacketed feed area. The one-piece feed section eliminates alignment and step/mating issues that can be found in conventional cast-iron feed sections with bolt-on barrels. The bimetallic feed area provides maximum wear resistance.
MELT FILTRATION & PUMP NEWS
The new VGP features a small footprint and all stainless-steel construction. Housings (forged or cast) contain internal flow passages for steam or oil heating. Models accommodate discharge pressures to 4350 psi and a temperature range to 500 F with an option for 660 F.
Shaft sealing is accomplished using single or double mechanical seals or standard visco seals. Seal design accommodates fast, easy replacement, with off-the-shelf seal availability from PSI. The company says this is an important feature, as a common problem with these types of products is availability of replacement seals.