Patent ID: 8334362
Filing Date: 2012-12-18
Classification: G01N

Abstract:
1. A method for determining a standardized melt elasticity value for a thermoplastic polymer, comprising the steps of: (a) heating the thermoplastic polymer to melt the thermoplastic polymer; (b) subjecting the melted thermoplastic polymer to a selected constant stress so that the melted thermoplastic polymer flows through a channel to form a strand of melted thermoplastic polymer leaving the channel at a velocity V 0 , the selected constant stress being in a range so that V 0 is greater than 1.27 millimeters per second, the channel having a diameter of about 2.1 millimeters and a length of about 8 millimeters; and (c) stretching the strand of melted thermoplastic polymer by applying a force to the strand of melted thermoplastic polymer to produce a stretched strand of thermoplastic polymer traveling at a velocity of about 33V 0 , the standardized melt elasticity value of the thermoplastic polymer being equal to the force.