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The FE-8 is a modular system to measure and control the layflat width on blown film lines. The non-contact measuring bar detects the edges of the film by two infrared sensors. In this way it calculates the layflat width. The advantage of this measuring method is that the real layflat width is registered, after the shrinking of the film. Hence the FE-8 is an important device also on lines where the bubble circumference is measured.