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Written by Administrator
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Thursday, 05 February 2009 05:57 |
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Among the first instruments plastics molders, extruders, and compounders are likely to consider when outfitting a new lab is a melt-flow indexer or "melt indexer." Known as an extrusion plastometer in more technical jargon, this apparatus has long been used to determine the melt-flow rate or mass-flow rate (MFR) of virgin and compounded thermoplastic resins. With the increased pressure on plastics processors to comply with ISO 9000 standards for quality management, more of them than ever are using these instruments to evaluate incoming material and test finished products. The melt-flow test detailed in the ASTM D1238 and ISO 1133 standards quickly measures one point on the viscosity curve under standard conditions. While the relative simplicity of this test has remained the same, melt indexers have evolved considerably since they appeared in the 1950s. Computerization and automation have reduced operator-to-operator variables, yielding results with greater accuracy and repeatability. Why measure melt index? Which method to use? More & better features
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Last Updated on Thursday, 05 February 2009 05:58 |
