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Technical Articles
 
Home >> Technical Articles >>Extrude PET Strapping From Undried Flake
Extrude PET Strapping From Undried Flake
Time: 2008-12-25
 
     A 90-mm single-screw extruder produced PET strapping from 100% undried PET bottle flake at a July open house of SIMA SrL, Bologna, Italy, a builder of extrusion lines for strapping. The extruder was equipped with an MRS planetary-ring section from Gneuss Kunststofftechnik GmbH in Germany. (Gneuss, Inc. is in Matthews, N.C.) The 8-ring Multi Rotation System is inserted midway along the extruder to increase surface-area exposure of the melt to vacuum venting. A conventional water-ring vacuum pump draws 25 to 30 millibars to remove residual moisture. An inline viscometer just before the melt pump indicates the moisture level of the material, so the vacuum level can be adjusted.
 
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