High bulky wool spun yarn and a drafting apparatus for preparing the yarn

A drafting roller assembly for a spinning machine, the drafting roller assembly comprising:

• a back roller part;
• a middle roller part;
• and
• a front roller part, said front roller part consists of a front bottom roller, a front top roller assembly, and a cleaning roller, said front top roller assembly further comprising at least one groove roller having a top surface, at least one of said groove rollers having multiple grooves formed on said top surface slantingly at about 45.degree. relative to the axis of the front top roller assembly.

A process of preparing a high bulky wool spun yarn comprising the steps of:

• (a) providing a spinning machine comprising
• a back roller part;
• a middle roller part;
• a front roller part, said front roller part consists of a front bottom roller, a front top roller assembly, and a cleaning roller, said front top roller assembly having at least one groove roller-having a top surface, at least one of said groove rollers having multiple grooves and multiple slanting grooves formed on said top surface, said multiple grooves being formed generally perpendicular to the axis of the front top roller assembly, and said multiple slanting grooves being formed at a slant of about 45.degree. relative to the axis of said front top roller assembly, at least one of said multiple slanting grooves having an abrasion resistant filler inserted and fixed therein;
• (b) providing a wool roving;
• and
• (c) passing said wool roving through said middle roller part and said front roller part such that bulky loops are formed on said roving.

A process of preparing a high bulky wool spun yarn comprising the steps of:

• (a) providing a spinning machine comprising:
• a back roller part;
• a middle roller part;
• a front roller part, said front roller part consists of a front bottom roller, a front top roller assembly, and a cleaning roller, said front top roller assembly having at least one groove roller having a top surface, at least one of said groove rollers having multiple grooves formed on said top surface at a slant of about 45.degree. relative to the axis of said front top roller assembly, at least one of said multiple slanting grooves having abrasion resistant fillers inserted and fixed therein;
• (b) providing a wool roving;
• and
• (c) passing said wool roving through said middle roller part and said front roller part such that bulky loops are formed on the roving.