초록 ▼

The invention relates to the field of forming fibrous structures by needling processes. A process is provided for achieving a desired Z-fiber distribution in a fibrous structure by controlling transport depth during formation of the fibrous structure in a series of needling passes. Each needling pas

The invention relates to the field of forming fibrous structures by needling processes. A process is provided for achieving a desired Z-fiber distribution in a fibrous structure by controlling transport depth during formation of the fibrous structure in a series of needling passes. Each needling pass generates a portion of Z-fiber bundles that penetrate adjacent fibrous layers, the Z-fiber bundles penetrating only those adjacent fibrous layers that need more Z-fiber bundles to attain a predetermined number of Z-fiber bundles within each fibrous layer.

대표청구항 ▼

[ We claim:] [1.] A process for forming a fibrous structure, comprising the steps of:superposing and needling a multitude of fibrous layers together in a series of needling passes that generate a multitude of Z-fiber bundles within said multitude of fibrous layers, each needling pass generating a po

[ We claim:] [1.] A process for forming a fibrous structure, comprising the steps of:superposing and needling a multitude of fibrous layers together in a series of needling passes that generate a multitude of Z-fiber bundles within said multitude of fibrous layers, each needling pass generating a portion of said multitude of Z-fiber bundles that penetrate adjacent fibrous layers, each portion of said multitude of Z-fiber bundles penetrating only those adjacent fibrous layers that need more Z-fiber bundles to attain a predetermined number of Z-fiber bundles within each fibrous layer in said multitude of fibrous layers.