Patent ID: 6405417
Filing Date: 2002-06-18
Classification: B65H,D04H,G03G

Abstract:
A process for forming a fibrous structure, comprising the steps of:forming a multitude of Z-fiber bundles that cohere a multitude of superposed fibrous layers in a series of needling passes, said multitude of fibrous layers including an upper group of fibrous layers and a lower group of fibrous layers subjacent said upper group of fibrous layers, each fibrous layer within said upper group of fibrous layers having a portion of said multitude of Z-fiber bundles originating in that fibrous layer and passing through a number of fibrous layers disposed beneath that fibrous layer without passing through all of fibrous layers disposed beneath that fibrous layer, said number of fibrous layers being constant within said upper group of fibrous layer, and each fibrous layer within said lower group of fibrous layers having a portion of said multitude of Z-fiber bundles originating in that fibrous layer and passing through all of said fibrous layers disposed beneath that fibrous layer.