Guill has updated its popular 800 series extrusion tooling with the introduction of a hybrid multi-layer die. It is designed to facilitate layer overlapping without adding cost or complexity to the process.
In some extrusion applications that utilize crossheads and inlines, several layers of the same material are applied multiple times using a single die, explained Guill. This prevents errors caused by gels breaking through thin walls, weld lines, inconsistent wall thicknesses, and material and process variations.
The 800 Series Hybrid combines the benefits of the legacy 800 Series — compact design, low residence time, and a common deflector bore — with an efficient design that overlaps layers in each semi-deflector using a single cone.
The essential benefits of the 800 Series Hybrid include:
- Elimination of weld lines in materials through patented overlapping technology, producing a more consistent finished product;
- reduced sensitivity to changes in viscosity or line speed;
- myriad material and multi-layer application possibilities;
- compatibility with all tubing and jacketing applications and a wide range of materials;
- low residence time;
- a compact design and low tolerance stack-up error factor, all resulting in improved concentricity.
The 800 Series Hybrid extrusion tool greatly reduces stagnation, because overlapping layers are more inherently balanced than single layers and also because each semi-deflector is “tuned to flush,” said Guill. Conventional deflectors must simultaneously achieve a balance between flushing, balancing, and eliminating the weld line. There is less difference between the slowest moving material and the fastest moving material in the deflector channels, thus making the viscosity more consistent in the deflector.