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What is melt fracture, what causes it, and how can it be corrected?

April 26, 2017causes corrected fracture melt

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What is melt fracture, what causes it, and how can it be corrected?

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Melt fracture is dependent on the visco-elastic behavior of the polymer, melt viscosity, lubricity of the polymer on metal surfaces, melt temperature, melt flow velocity, and surface characteristics of the die material. Melt fracture is a grainy or frosted appearance on the surface of a normally clear extruded part. Figure G2 shows an example of melt fracture although it is somewhat exaggerated.