What is the Tooling Design for Tubing ?

By: Chris Rauwendaal, Technical Consultant, B&H Tool Co.
August 28, 2009

Introduction

The requirements for medical tubing with respect to dimensional tolerances and overall quality are stricter than almost any other application. This, coupled with the small tubing sizes typically produced, presents major challenges to the producers of medical tubing. The requirements are often so exact that strict adherence to fundamental extrusion design principles are essential for companies seeking to improve their extrusion performance. While these principles are crucial for medical tubing manufacturers, they apply just as well in other industrial extrusion applications. For example, wire and cable manufacturers can
benefit from these principles for their jacketing applications.

Definition of Various Draw Ratios Tooling design for tubing is a critical issue in tubing extrusion but there is limited useful information available. Important issues in the design of tubing tooling are the various draw ratios that define the tooling and the extrusion process. The dimensions of the tip (mandrel) and die are determined by the draw down in the extrusion process. There are various draw ratios in tubing extrusion that describe
how the tubing is drawn down at the exit of the die. The diameter draw ratio (DDR) is the average diameter of the tip and die divided by the average diameter of the tubing.

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