Automatic-ramping software. (Briefs).
A new software feature on the Process Control Corp. Gravitrol
control systems and Gravimetric blenders allows an extrusion line to
ramp up and down automatically while maintaining "perfect"
product gauge and layer distribution over the entire line speed change,
the manufacturer reports. Unlike conventional ramping methods-- which
tend to force huge changes to the processing method, and which in turn
creates a variation in product thickness--the new software allows the
line to be ramped up and down by incremental steps toward the new line
speed, according to Process Control. At each step change in the line
speed, the system "learns" the weight loss of each extruder
and calculates the extruder speed for the next line speed step change.
The line speed change and coinciding extruder speed calculation continue
until the final desired speed is reached, Process Control says.
Process Control Corp., 6875 Mimms Dr., Atlanta, GA 30340; (770)
449-8810; fax (770) 449-5445; www.process-control.com
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