Physiological and training characteristics of recreational marathon runners.

Purpose: The aim of this study was to examine the physical and training characteristics of recreational marathon runners within finish time bandings (2.5-3 h, 3-3.5 h, 3.

Tubing extrusion made easier, Part II.

An increased understanding of the primary elements will lead to greater control of the extrusion process. In the ongoing quest to produce tubing with consistent properties. Part II of this two-part article makes recommendations on best practice in barrel and screw design, compression ratios and dies.

Tubing extrusion made easier, part I.

To produce tubing with consistent properties, it is important to know the material, understand the process, control the basics, and keep the goal, that is, the product in focus. Tips on controlling the process and producing the required results are provided in this two-part article. Part I focusses on the melt and material sensitivities.