Hand-Held Sensor 'Reads' Web Shrinkage and Stretch

A new inexpensive, hand-held device from Strandberg Engineering Laboratories Inc., Greensboro, N.C., can measure the speed of a web on various chill and winding rolls in a line, memorize those speeds, and calculate the rate of shrink or stretch between different rolls.

A new inexpensive, hand-held device from Strandberg Engineering Laboratories Inc., Greensboro, N.C., can measure the speed of a web on various chill and winding rolls in a line, memorize those speeds, and calculate the rate of shrink or stretch between different rolls. Strandberg developed the Spectrum 4 for textile webs but says it could be used on plastic films. The device shows speed to the nearest 0.1 yd/min and stretch or shrinkage to the nearest 0.1%. Regular walk-throughs with the device can find machinery problems before they become quality issues, Strandberg says. The Spectrum 4 costs $1400.