understanding polymer processing osswald pdf

Fluid Mech. In his report [2] he mentions several rubber items made by native South Americans, including a piston-less pump composed of a rubber pear with a hole in the bottom. The characteristic process time can be defined by the ratio of characteristic die dimension and average speed through the die. The parabolic temperature distribution through the thickness of a solidified injection molded part leads to a parabolic residual stress distribution, compressive in the outer surfaces of the component and tensile in the core. As a result of the competing deviatoric stresses and surface forces, the cylindrical shape becomes unstable and small disturbances at the surface lead to a growth of capillary waves, commonly called Rayleigh disturbances.

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