Abstract: This invention pertains to methods of defining and developing first and second sets of periodic features of a web wherein neither the first set or second sets of features is readily sensed as a reliable registration element against which the location of the other can be registered. The method comprises applying registration images along the web, leading edges of the images being consistent with sufficient acuity and measurable intensity of image, and having suitable outline, to be discerned by a registration sensor. The registration images can thus serve as registration marks for determining positions along the length of the web. The web features are applied periodically along the web, forcing registration of the first set of web features to the registration images. The trim material is removed from the web, defining and developing the cut-outs in registration with ones of the first set of web features.

Abstract: This invention pertains to methods of checking for successful removal of trim material from trim areas disposed at periodic intervals along a web in a processing line. Marking material is marked, optionally as reference marks or reference images on the trim material pieces. Trim material is severed and removed to develop cut-outs at the trim areas. After removing the trim material, the method senses for the marking material at and adjacent the trim areas. The method thus detects marking material on trim material pieces which are not successfully removed from the web. In preferred embodiments, the web, outside the trim areas, is free from the specific marking material used for the reference marks or reference images. The marking material is preferably detectable, using a suitable sensor, independently of visible light emanating from, or reflected from, the marking material.