| 摘要 |
The invention relates to the joining of fabrics made of advanced fibers for making pre-forms for composite materials. The invention provides a sewing machine needle which can be used to join fabrics by stitching with a brittle thread. The needle, according to the invention, for stitching a brittle fiber thread through at least one layer of fibrous fabric, being characterized by the head (point) thereof having an (open eye) slit proximate to the needle point for receipt and release of the brittle thread, the slit of the needle having an arc shape with a radius of curvature of not less than 1 mm, to prevent sharp bending of the brittle thread when the thread is in contact with the slit. |
