Density meter improves quality for Cartier Del Garda paper mill

Accuracy of Micro Motion density meter removes need for expensive coating additives, enabling significant annual savings.

07/18/2011


Micro Motion density meter. Courtesy: Emerson Process ManagementCartiere del Garda is using a Micro Motion density meter from Emerson Process Management to accurately measure the concentration of kaolin and other additives in the coating process at its paper mill on the banks of Lake Garda in Italy. The Micro Motion 7845 Density and Concentration Meter provides highly accurate density measurements under entrained gas conditions.

"The highly accurate measurement of the coating mixture concentration  provided by Emerson's Micro Motion density meter means we have been able to  discontinue the use of expensive additives,” said Fulvio Prati, instrument  manager at Cartiere del Garda. “This has enabled significant annual savings and paper quality is improved."

Cartiere del Garda operates a modern paper mill in Italy, specializing in high quality coated papers. For many years, a Micro Motion Coriolis flowmeter was used to monitor the concentration of the paper coating mixture and this provided reliable and accurate results. However, because the recirculation system on the feeding tank generated entrained air, it was necessary to add expensive additives to the coating mixture to prevent quality problems.

Removing the additives would reduce production costs but would cause up to 20% air to be entrained in the coating mixture. The existing Coriolis flowmeter was not designed to provide the same degree of density measurement accuracy under these conditions, so Cartiere del Garda sought an alternative solution. The company needed an on-line, solids concentration measurement of the coating solution, made directly at the film coater machine feed. A minimum accuracy of +/-1 percent of solids was required to guarantee the high quality of the paper being produced and avoid waste caused by out-of-specification batches.

Cartiere del Garda chose a Micro Motion 7845 Density and Concentration Meter for this challenging application. The company specified the advanced electronics, entrained gas version, which is designed to accurately measure density in aerated liquids − providing a final accuracy of better than +/- 0.5 percent with very high stability and repeatability. The 7845 provides a 4-20 mA signal to the control system, related to line density. Density is converted into percentage solids using a formula embedded into the control system.

The Micro Motion 7845 is a straight tube, liquid density meter that uses a vibrating tube to measure density. As the liquid density changes, it affects the vibrating mass of the density meter. The change in vibrating mass then affects the resonant frequency, which is inversely proportional to the density of the process fluid. By monitoring the resonant frequency and applying well-known conversions, the 7845 provides highly accurate in-line density data.

The Micro Motion 7845 Density and Concentration Meter is rugged, reliable, and requires minimum maintenance. The meter is calibrated in an ISO17025-accredited laboratory, traceable to International standards, and requires no field calibration.

Emerson Process Management

www.EmersonProcess.com



No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
Each year, a panel of Control Engineering editors and industry expert judges select the System Integrator of the Year Award winners.
Control Engineering Leaders Under 40 identifies and gives recognition to young engineers who...
Learn more about methods used to ensure that the integration between the safety system and the process control...
Adding industrial toughness and reliability to Ethernet eGuide
Technological advances like multiple-in-multiple-out (MIMO) transmitting and receiving
Virtualization advice: 4 ways splitting servers can help manufacturing; Efficient motion controls; Fill the brain drain; Learn from the HART Plant of the Year
Two sides to process safety: Combining human and technical factors in your program; Preparing HMI graphics for migrations; Mechatronics and safety; Engineers' Choice Awards
Detecting security breaches: Forensic invenstigations depend on knowing your networks inside and out; Wireless workers; Opening robotic control; Product exclusive: Robust encoders
The Ask Control Engineering blog covers all aspects of automation, including motors, drives, sensors, motion control, machine control, and embedded systems.
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
News and comments from Control Engineering process industries editor, Peter Welander.
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
This is a blog from the trenches – written by engineers who are implementing and upgrading control systems every day across every industry.
Anthony Baker is a fictitious aggregation of experts from Callisto Integration, providing manufacturing consulting and systems integration.
Integrator Guide

Integrator Guide

Search the online Automation Integrator Guide
 

Create New Listing

Visit the System Integrators page to view past winners of Control Engineering's System Integrator of the Year Award and learn how to enter the competition. You will also find more information on system integrators and Control System Integrators Association.

Case Study Database

Case Study Database

Get more exposure for your case study by uploading it to the Control Engineering case study database, where end-users can identify relevant solutions and explore what the experts are doing to effectively implement a variety of technology and productivity related projects.

These case studies provide examples of how knowledgeable solution providers have used technology, processes and people to create effective and successful implementations in real-world situations. Case studies can be completed by filling out a simple online form where you can outline the project title, abstract, and full story in 1500 words or less; upload photos, videos and a logo.

Click here to visit the Case Study Database and upload your case study.