Method and process for perforating a nonwoven web made of fibers or filaments

摘要

To perforate a nonwoven fabric, it is moved along one surface of a thin material fitted with at least one opening (7). A mechanism pushes the fibers or filaments through the opening (7) to project over the other surface (6a), to be cut. The fibers or filaments are drawn through the opening (7) by suction. The cutter (16a) is at right angles to the surface (6a) where the fibers/filaments are moved through and are blocked at the opening (7). An Independent claim is included for an appts. with a thin support material for the nonwoven, fitted with at least one opening (7) for the fibers/filaments to be moved through it and then cut (16a). Preferred Features: The thin support is the mantle of a rotating perforated cylinder (2), with a suction system within the cylinder. The cutter is a fixed blade (16a) within the cylinder (2), aligned at the inner surface (6a) of the cylinder mantle. A plug (17) is moved into the bottom of the mantle opening (7), after the fibers/filaments have been drawn through, to block their position and prevent movement during cutting. The plug (17) movements are applied through a second supporting cylinder (4), and are synchronized with the rotation of the perforated cylinder (2). The mantle openings (7) are circular, in a given dia. Each plug (17) has a hemispherical tip (18), larger than the dia. of the openings (7). Each plug (17) rests on a pressure spring (20) so that, as its support cylinder rotates (2), the spring (20) presses the plug (17) into an opening (7) over a height movement path (H), when they are in alignment. Each plug (17) has a pin (23) in a mounting (22) with an angled slide (24) at the direction of displacement which shifts the pin (23).