A METHOD OF ENDROUNDING LOOSE FIBRES

摘要

For implant molding of toothbrushes pre-cut and pre-rounded fiber of thermoplastic material are used. Loose fibres are presented to an endrounding tool in a tuft or bundle and the free ends of the fibres are exposed to a working surface of the tool. Relative movement between the fibre ends and working surface causes the material of the fibres to be heated by friction of a predetermined intensity. The fibres while they are exposed to the working surface of the tool are permitted to flex laterally and are held in an axial direction of the tuft or bundle with their free ends commonly defining a surface different from a plane which is perpendicular to the axial direction, thereby achieving a substantially consistent flexing resistance throughout the cross section of the tuft or bundle with respect to lateral deflection upon engagement by the endrounding tool.