The Conical needle
The Foster Conical needle has a blade section which is tapered from the needle’s point along its entire length to where it meets either the shank or intermediate. The conical shape of the blade allows the thinnest portion of the needle to more easily penetrate the web.
Its barbs also increase in size from the point to the back portion of the blade, allowing the needle to more easily penetrate the web. The conical blade is used primarily in areas of high needle breakage usually associated with recycled or natural fibers such as cotton, flax, jute, and shoddy.
The conical blade is not ideal for all applications, as the needle may create larger needle holes on the fabric surface.