Выражение встречается в следующем контексте:

Extrusion: Polymer tubes-Polymer pellets and SHA powders (about 0.01-30 wt% of the polymers) were extruded as a tube (I.D.: about 3mm, E.D.: about 5mm) from the Laboratory Mixing Extruder. The temperatures of the barrel and the die were kept at 120-200 and 160-200oC, respectively.

Заранее спасибо