Plastics Technology

APR 2017

Plastics Technology - Dedicated to improving Plastics Processing.

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吀栀攀 爀攀ⴀ攀渀最椀渀攀攀爀攀搀 䴀漀搀甀氀愀爀 䔀愀最氀攀 猀栀爀攀搀猀 搀漀眀渀琀椀洀攀 愀渀搀 氀愀礀猀 眀愀猀琀攀 琀漀 愀氀洀漀猀琀 愀渀礀 洀愀琀攀爀椀愀氀⸀ 吀栀攀 䴀漀搀甀氀愀爀 䔀愀最氀攀 猀栀愀欀攀猀 甀瀀 琀栀攀 洀愀爀欀攀琀 眀椀琀栀 瀀愀琀攀渀琀攀搀 匀瀀氀椀琀ⴀ䄀ⴀ倀愀爀琀 愀挀挀攀猀猀 愀琀 愀 瘀愀氀甀攀ⴀ搀爀椀瘀攀渀 瀀爀椀挀攀⸀ 吀漀 猀挀栀攀搀甀氀攀 愀 搀攀洀漀 挀愀氀氀 ⠀㔀 ㈀⤀ 㘀㌀㜀ⴀ㘀㜀㜀㠀 漀爀 攀洀愀椀氀 甀猀 愀琀 猀愀氀攀猀䀀爀攀瀀甀戀氀椀挀洀愀挀栀椀渀攀⸀挀漀洀⸀ 刀攀瀀甀戀氀椀挀䴀愀挀栀椀渀攀⸀挀漀洀 New-generation manual screen changers from Nordson Corp., Hickory, N.C., are said to cut in half the force required for switching screens on the extrusion line, making easier a task that used to challenge the strength of some machine opera- tors. Like Nordson's standard manual screen changers, the new BKG NorCon EMR and XMR models provide a less expen- sive alternative to stationary screen changers. The operator replaces a contaminated screen with a clean one by turning a handle or lever that actuates an indexing system. The new models 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. As an example of the reduction in screen-switching force, tests by Nordson showed that the NorCon EMR-35 unit requires 25 lb (111 N), versus 50 lb (222 N) for the EM-35. 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 EXTRUSION EXTRUSION Melt Filters Have Easy-Change Screens Producers of expanded polystyrene (XPS) insulation board and polyolefin foams can replace some or all hydrocarbon foaming agents with carbon dioxide (CO 2 ) or nitrogen (N 2 ) using new high- pressure gas-dosing systems from Linde LLC, Bridgewater, N.J. These inert gases provide consis- tent, eco-conscious foaming while also reducing fire hazards. Linde's new DSD 400 metering system and process is said to provide precise amounts of liquid CO 2 or gaseous N 2 to the extrusion process to help optimize foaming and reduce density with its high-perfor- mance compressor, mass-flow meters, and dynamic control valve. In addition, its ability to quickly react to pressure fluctua- tions at the extruder keeps the process stable while generating consistent foam structures. This allows a customer to minimize, or sometimes even eliminate, use of flammable hydrocarbons that can affect environmental emissions from the site. The DSD 400 inert-gas metering device handles pressures up to 5081 psi (400 bar) and can pump liquid CO 2 through the control valve at a constant rate at speeds up to 66 lb/hr (30 kg/hr). The DSD 400 offers highly accurate dosing and low gas consumption for high efficiency. It features lightweight and compact design for easy installation. 908-771-1491 • lindeus.com Gas Metering Equipment For Extruded Foams @plastechmag 67 Plastics Technology N E W P R O D U C T S F O R P L A S T I C S P R O C E S S I N G

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