Process Control's Gravitrol® Gravimetric Extrusion Control Systems automate the control of any extrusion line - coextrusion or mono extrusion - on the basis of weight. The EXB Central Computer/ Operator Station is the key component of a complete Gravitrol® system.
A standard system has an HG Series Weigh Hopper mounted on each extruder to measure the weight throughput. The weigh hopper reports the measurements to the EXB central computer, which controls the extruder drives via EXD Drive Control Modules. An EXL Line Speed Control Module can be added to control the take-off device for control of line yield (weight per length).
In coextrusion applications with Process Control X Series blenders, the EXB central computer ...
(5) Designed for use as part of the Gravitrol® system, the HGB Series Weigh Hopper incorporates engineering and design breakthroughs to help achieve the optimal result in extrusion: a uniform product within tolerance at the lowest possible manufacturing cost.
The Gravitrol® system gives you total control over your mono-extrusion or coextrusion processes. The system can be configured to control extruder rate by weight; layer percentages by weight; weight of extrudate by length; average thickness; and pipe or tube diameter.
The HGB Series Weigh Hopper is a central part of this system because it precisely monitors the amount of material consumed by the extruder. In effect, the extruder becomes a gravimetric metering ...
PROCESS CONTROL "X" Series blenders can be equipped with extrusion control software to allow the blender to control the extruder and line speed on mono extrusion lines for consistent output by weight. The only additional hardware needed is an EXD extruder drive control module and, if line speed is to be controlled, an EXL line speed control module.
Gravitrol® extrusion control offers the benefits of improved product quality, reduced material usage, quicker startups and product changeovers, reduced scrap, and improved product repeatability. At the same time, it reduces the operator's workload by maintaining a consistent output, regardless of screen pack or material variations.