Maximising tubing functionality, Part II: processing guidelines: incorrect choices in materials...

Polymer processing guidelines

Polymer processing includes three areas of consideration: extrusion hardware, materials drying and handling, and processing/postcuring conditions. First, the manufacturer's choice of extrusion hardware should be subjected to a quick checklist:

* typically, extruders of screw size 0.5 in. (1.27 cm) to 1 in. (2.54 cm) diameter are used, depending on the tubing size

* a screw length:diameter ratio of 24:1 is preferred

* typically, a low-shear, low-output screw design is recommended, and it should be tailored t