Читать книгу The Rheology Handbook - Thomas Mezger - Страница 209

Polymers, when extruding rods, pipes or profiles (e. g. window frames), and when spinning synthetic fibers.

Sometimes, the following parameters are determined:

Swell ratio (or swell factor):

SR = d1/d = (d + Δd)/d

Die swell (or relative swell):

Δd/d = (d1 – d)/d = (d1/d) – 1

with the diameters d of the die and d1 of the extrudate, and their change Δd (= d1 – d)