Creep is the tendency of a material to flow in the solid state. Wikipedia defines it more accurately as deformation http://en.wikipedia.org/wiki/Creep_(deformation). The rate of deformation is time and temperature dependent. No surprize there. Viscosity, or how resistant a material is to flow dictates how susceptible it is to creeping ( think molasses vis a vis …
Melt fracture a/k/a “sharkskin” or “applesauce” occurs in LLDPE film. To say that much has been written on the subject is an understatement. Entire books and dissertations abut melt fracture have been written by polymer chemists a lot smarter than me. Still there is not total agreement on the causes. Personally, I have a hypothesis …
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