Abstract
We describe hardware and software features of an image analysis-based instrument developed in our laboratory to characterize web structure. The potential value of detailed web analysis that is possible today using image analysis is illustrated for a small number of roofing mat webs by characterizing basis weight (small area) uniformity, fiber bundle orientation (directionality control) and fiber bundle diameter (dispersion quality). From this analysis, we show that it is possible to observe differences in web structure between the top and wire sides of webs, built-up roofing and shingle mat webs, production with hydraulic pressurized (closed) and atmospheric (open) headboxes, production with and without a flow synchronizer, and web basis weight.