PROCESS CONTROL "X" Seriesblenders can be equipped with extru-sion control software to allow theblender to control the extruder andline speed on monoextrusion linesfor consistent output by weight. Theonly additional hardware needed is anB&R Drive Speed moduleand, if line speed is to be controlled,a B&R Line Speed Control module.

Gravitrol® extrusion control offersthe benefits of improved productquality, reduced material usage, quick-er startups and product changeovers,reduced scrap, and improved productrepeatability. At the same time, it

reduces the operator's workload bymaintaining a consistent output,regardless of screen pack or materialvariations.

The system uses Process Control'sproven Gravitrol® software to auto-mate the control of the line and holdthe extruder output to +/-0.5% byweight. This tight control of outputmeans that product can be madeconsistently within tolerance at thelowest possible cost.

Process Control "X" Series blendersmonitor the extruder usage in orderto follow the extruder rate and insure

a consistent supply of material. In anextrusion control system, this extrud-er rate is used to adjust the screwspeed by minute amounts to hold theoverall throughput to the valueentered in the blender operator sta-tion.

Because the blender already has apowerful computer and equipmentnecessary to measure the extruderrate, adding extrusion control on amonoextrusion line with a ProcessControl "X" Series blender is a verycost-effective addition. This featurecan be easily retrofitted to existinginstallations with "X" Series or BSeries blenders.

"X" Series blenders can also be easilyintegrated into coextrusion applica-tions with extrusion control for con-trolling product layer ratios and totalline throughput. On coextrusionapplications the blender computerreports to a master EXB2 centralGravitrol® computer, which alsoreceives weight throughput readingfrom HG Weigh Hoppers mountedon single-component extruders.

X Series blender with extrusion control: Proven Gravitrol® gravimetricextrusion control and blending in one integrated, easy-to-use package.

Gravimetric Extrusion Controlfor X-Series Blenders

Standard FeaturesB&R Color Touch Screen Control

Quick installation on new or existing lines0-10 VDC or 4-20 mA analogdrive control signals

OptionsB&R Drive SpeedControl ModuleB&R Line SpeedControl ModuleSpecial Electricals

B&R Line Speed Control

B&R Color Touch ScreenControl

B&R

B&R Control Module

via

via B&R Line Speed Module

Actual Extruder Rate

Set Extruder Rate via B&R Control Module

Extruder

Line Speed Information

via B&R Line Speed Module

B&R Line Speed Module

Finished Product

Extruder Outputis Held Consistant to + 0.5%

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