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Melt extrusion technology defined.

The "spin beam" or beam is a common name used by many fiber producers and machine suppliers to describe the system that distributes molten polymer to various spinning positions at equal residence time and temperature. The beam also houses the various components described below and allows for convenient spin pack changes as required for replacement of filtration media and product changes.

Other familiar terms used to describe beam components are: "Spin Pack," which is several components bolted together including the entry plate (pack top), filtration media and spinneret; "Polymer Manifold," which distributes the molten polymer to the desired location; "Pump Block," which channels polymer from the manifold to the metering pump and then to the spin pack and mounts the metering pump. Some of the primary distinguishing features of various spin beam designs are:

Heating System: There are four typical variations. The first is a remote boiler. Second is an internal boiler to the beam. Third is circulated oil or other heat transfer media through beam. Finally there is direct electric heating.

Pack Loading Type: Spin packs are loaded from the bottom or from the top. Large, heavy packs are usually installed from the top, but bottom loaded packs inhibits cold spots caused by chimney effects.

Polymer Manifold Piping: Located internal within the vapor or external to the vapor. External manifolds are easier to maintain and generally provide adequate temperature uniformity.

Metering Pump: A special gear pump used to meter the polymer through the spinneret.

Polymer Pump Mounting Blocks: Welded in place or removable. The welded block provides better heat transfer but is harder to clean out and maintain.

Metering Pump Drive Orientation: Pumps are mounted horizontal or vertical to the beam. Horizontal mounted pumps reduce required building height, but maintenance is more difficult and dangerous.

Spin Pack Pierced Area Geometry: Filament bundle orientation can be round, rectangular or radial. Each provides advantages depending upon the product and polymer.

Hills continues its commitment to the development of spin beam and spin pack designs. A representative of Hills would be pleased to discuss the advantages and disadvantages of the options presented above and to develop a recommendation for your specific application. Complete extrusion and fiber processing systems are available. Please call Steven Fredricks at (407) 724-2370; telex 469353 or see us at Booth I-401 at ITMA-92 in Greenville.
COPYRIGHT 1992 Rodman Publications, Inc.
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Copyright 1992 Gale, Cengage Learning. All rights reserved.

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Title Annotation:10th Annual Show in Print of the International Nonwovens Industry
Publication:Nonwovens Industry
Date:May 1, 1992
Previous Article:May develops solventless equipment.
Next Article:Elsner introduces versatile folder.

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