Plastics Technology

FEB 2018

Plastics Technology - Dedicated to improving Plastics Processing.

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Find out how the MA XX series can make the difference…. • Higher torque, more volume, better cooling • Screw diameters from 12 to 26 0 mm • Systems for pelletizing & direct extrusion • Fully equipped NJ process laboratory • Twin Screw Extrusion Workshops Compounding • Devolatilization • Reactive extrusion • Foaming Twin Screw Extruders and Systems Leistritz Extrusion A Business Unit of Leistritz Advanced Technologies Corp. 175 Meister Avenue, Somerville, NJ 08876, USA Ph 908-685-2333 E-mail sales@leistritz-extrusion.com www.leistritz-extrusion.com Quick-Change Manual Screen Changer New-generation manual screen changers from Nordson Corp. reportedly reduce by 50% the force required for switching screens on an extrusion line, making easier a task that typi- cally tests the strength of machine operators. Like Nordson's standard manual screen changers, the new BKG NorCon EMR and XMR models provide a less expensive alternative to stationary screen-changer systems. The operator replaces a contaminated screen with a clean one by turning a handle or lever that activates an indexing system. The new EMR and XMR screen changers contain a ratchet mechanism that reduces the force required to turn the handle. This mechanism can also be retrofitted onto corresponding standard models EM and XM, at either the customer's plant or a Nordson technical support facility. While EMR and EM units are for use with extruders sized in inches, the XMR and XM units are for metric equipment. Available standard NorCon manual screen changers range from 10 to 65 in. for EM units and 30 to 120 mm for XM units. EMR and XMR models are available in most of these sizes. 828-326-9888 • nordson.com A new stretch-film line from Davis-Standard, Pawcatuck, Conn., is said to set a benchmark for modular efficiency for high-grade stretch-film operations. Installed in early 2017 at an undisclosed, large North American film producer, this line reportedly offers a compact layout, ease of operation and servicing, excellent profile control, consistent roll quality, and an intuitive control package to produce film at thicknesses from 7.8 to 13 microns at high speeds. Davis-Standard's side-by-side DS S3 overlapping winder (photo) is essential to this capability. The S3 winder enables maximum slit widths for hand-wrap, machine-wrap, and jumbo rolls, supporting multiple market segments on one winder. Films discharge from the front of the line to a common side to simplify roll packing and future automation. Cores are also same-side loaded from the back to prevent disruption of packing activi- ties. There is an auxiliary lay-on roll to eliminate top-wind waste during transfer, optimizing roll quality and eliminating outer- wrap transfer waste. High-volume core bins minimize refilling frequency and feature simultaneous core-set discharge of multiple core lengths while also decreasing cycle time, improving slit-width flexibility, and net film utilization. Core widths can be changed on the fly to maximize uptime. There is a 30-sec cycle time regardless of the number of slit widths, which is ideal for hand-wrap products. A pull-through trim system reportedly eradicates trim jams into the granulator regardless of line speed or film thickness. Motor- driven web-support rollers with an air-venting finish improve film transport at high line speeds, providing high-quality roll formation. The air-venting idler-roll finish locks film on the rolls at low tension for excellent tracking and roll edge straightness. In addition to system components, an over-the-line mezza- nine accommodates a smaller footprint, while also enabling safe servicing of the extruders, screen changers, melt pipes, and associated control systems. With the unique "through-the-mezza- nine feedblock riser," there is safe and convenient access to the selector plug for layer-sequencing changes. Selector plugs can be changed with minimal downtime, allowing product flexibility in layer-sequencing to easily accommodate production schedules. 860-599-1010 • davis-standard.com EXTRUSION EXTRUSION High-Speed Stretch-Film Line 74 FEBRUARY 2018 Plastics Technology PTonline.com Keeping Up W it h Technolog y

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