melt instability

melt instability

[′melt ‚in·stə′bil·əd·ē]
(mechanics)
Instability of the plastic melt flow through a die.
References in periodicals archive ?
The technical difficulties include: 1) the melt instability between the two ingredients; 2) the need to instantly adjust the throughput ratio; and 3) the complex design of the conjugated spinnerette.
Kynar Flex PPA is a new process aid to improve extrusion of LLDPE, mPE, and PP, eliminating or minimizing the effects of melt instability that can occur during high-shear extrusion.
Polymer melt viscosity * Elasticity, die swell, extrudate defects * Mechanism of melt instability Flow visualization through a glass barrel