PT ZONE: Focus on Weighing
Core Challenges4.5.1.2 – Photo 4.5.1.3 – Weighing Factors SchematicAccurate, precise and responsive gravimetric feed rate control is not possible without accurate, precise and responsive weight measurement. More (+)
Available Technologies4.5.2.2 – Photo (upper right) 4.5.2.3 – PDF: The Digital/Analog Debate (tbs) 4.5.2.4a – Vibrating Wire Principle Art 4.5.2.4b – SFT Photo Collage 4.5.2.5 – PDF: How K-Tron SFT Tech… (tbs) 4.5.2.6 – Strain Gauge Art 4.5.2.7 – LVDT ArtProfile of Vibrating Wire TechnologyVibrating wire weighing technology originated in the 1950s in heavy-duty mining, civil and hydrological load cell application where its reliability and drift-free performance was well suited to the need. More (+)
MOST RECENT CONTENT: Focus on Weighing
In Loss-in-Weight Feeding
6/15/2011Plastics Technology
4.5.3.2 – Photo 4.5.3.3 – Suspension/Platform ArtThe need to accurately and continuously weigh in a process environment presents specific challenges to a loss-in-weight feeder.
In Weigh Belt Feeding6/15/2011Plastics Technology
4.5.4.2 – Photo 4.5.4.3 – Thru the Belt Schematic 4.5.4.4 – Auto Tare SchematicThe need to accurately and continuously weigh in a process environment presents specific challenges to a weigh belt feeder.
In Weigh Meter Feeding6/15/2011Plastics Technology
4.5.5.2 – PhotoThe need to accurately and continuously weigh in a process environment presents specific challenges to a weigh meter / rotary valve feeder.
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OVERVIEW:
Focus on Weighing
Key to gravimetric feeding, weight measurement provides the means to "close the loop" on feed rate control. This section details the unique challenges faced in precision weighing in the process environment, and profiles the technologies and application considerations surrounding this crucially important contributor to feeder performance.
The second leg of the gravimetric feeding triangle, weighing, refers to a feeder’s on-board measurement of this crucially important variable, essential to the accurate determination and control of gravimetric feed rate.
This section begins with the core challenges faced in the weighing operation. Next, the three most prevalent current technologies in weighing are introduced: the vibrating wire, the strain gauge, and the linear variable differential transformer, or LVDT.
And in the last three sections, weighing issues are detailed for each type of feeder operating principle (loss-in-weight, weigh belt and weigh meter) commonly employed in plastics processing.
