Capacitance Gauges Come of Age For Blown-Film Thickness Control.

Plastics Technology | October 1, 1999| | Copyright

* Thanks to recent technical advances, relatively inexpensive capacitance thickness gauges reportedly are now stable enough for reliable closed-loop control, not just monitoring thickness variations. Another big step forward for capacitance gauges is the arrival of non-contact heads that can be mounted on the bubble instead of farther downstream on the layflat, thereby allowing quicker response to thickness variations.

Capacitance gauges measure the ability of a plastic to hold an electrical charge and convert that number into thickness. Early versions got a bad ...

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