A yarn core, either formed to a cylindrical shape, or in a cone configuration, includes a shallow cavity approximate one end, and within the cavity, around the circumference of the core, there is included a coating of a slip resistance material, preferably formed as a colloidal silica, to enhance the...http://www.google.es/patents/US4057201?utm_source=gb-gplus-sharePatente US4057201 - Yarn core including slip resistant transfer coating
Yarn core including slip resistant transfer coating
