Originally posted by rajul
John, thanks for the greeeeeeaaaat tip ! (you can the word stretches more in one direction too LOL !). I think it is technically sound to expect anisotropic shrinkage in the film as the carbon backbone of the polymer molecules are oriented in the direction of the extrusion. It's kinda like miniscule springs arranged in one direction 
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I understood what you said, but I think I hurt myself doing it! Great tip, Who Knew???