Linear elements such as filaments having grafted nibs are disclosed. The grafted nibs are generally fibrils and/or scales which can be flexible or rigid. The nibs can be randomly grafted onto the linear element or they can be inclined or oriented in one direction so as to offer relatively little resistance...http://www.google.es/patents/US4180890?utm_source=gb-gplus-sharePatente US4180890 - Linear element with grafted nibs and method therefor
Linear element with grafted nibs and method therefor
