the multifilamentary yarn in the groove the barbs of the needles catch and break a fraction of the filemants from the side of the yarn so that the yarn is not forced upward out of its grooved path application_number US 53247290 A description for the purpose of promoting an understanding of the principles of the invention reference will now be made to specific embodiments of the invention and specific language which will be used to describe the same it will nevertheless be understood that no limitation of the scope of the invention is thereby intended such alterations and further modifications and such further applications of the principles of the invention as discussed are contemplated as would normally occur to one skilled in the art to which the invention relates in the process of the invention as shown in fig1 continuous multifilament yarn 1 which might be for example smooth textured bulked or crimped may be continuously withdrawn from supply package 2 the withdrawn yarn passes through pigtail guide means 3 and 4 onto separator roller 5 before it is conveyed onto abrading wheel 6 shown generally in this figure grooves 7 in the abrading wheel direct the yarn in a particular path around the wheel and separator roll 5 the abraded or staple like yarn is then withdrawn from wheel 6 and passed over dancer idler roll 9 and thereafter wound up into package 8 by conventional winding means 10 abrading wheel 6 is shown in more detail in fig1 a and fig1 b yarn 1 coming from the supply to separator roller 5 makes a multiplicity of passes through grooves 7 formed.