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Tape Lines

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Author	Topic: Tape Lines
ravi Senior Member Posts: 8 From:chennai, Tamilnadu, India Registered: Apr 2005	posted August 10, 2005 06:49 AM The grooved feed section of the barrel in the Tape lines using HDPE or PP wear off very fast, creating lots of processing problems. This is a design limitation which cannot be avoided. Can anyone suggest me ways to delay the wear off? Regards, Ravi. IP: Logged
Tom C Moderator Posts: 570 From:Brodheadsville, PA USA Registered: Jun 2001	posted August 10, 2005 10:25 PM Ravi, Typical axial grooves allow pellets to slide along the groove under high pressure. This causes lots of wear. Helical grooves prevent the pellets from sliding, reducing wear. Pressure buildup can be reduced by starve feeding the extruder. Decompression of the screw in the feed will reduce pressure buildup. Allowing the throat to heat up will reduce wear, but may also clog the grooves with partially melted resin. Typically feed throats are cast iron which will wear quickly. A harder lineer will help, but it must be thicker than the grooves are deep. Additioanlly it must be well secured to the throat casting. This is not that easy a combination to get. A compatible lubricant dusted onto the pellets may help. ------------------ Best Regards, Tom Cunningham Extrusion Technical Services www.ExtrusionTechnicalServices.com IP: Logged
ravi Senior Member Posts: 8 From:chennai, Tamilnadu, India Registered: Apr 2005	posted August 10, 2005 11:13 PM Thanks for the reply. Among the suggestions u have made the addition of lubricant seems to be the easiest way out. Can u suggest me the source from which to get it? Regards, Ravi IP: Logged
Tom C Moderator Posts: 570 From:Brodheadsville, PA USA Registered: Jun 2001	posted August 11, 2005 08:32 AM I'm thinking a wax may be best to lower the friction between the pellets and the groove. I know there are low molecular weight polyethylene waxes available which will be compatible. Try Honeywell AC wax. These waxes will likely also improve the surface gloss of your product. ------------------ Best Regards, Tom Cunningham Extrusion Technical Services www.ExtrusionTechnicalServices.com IP: Logged

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