Abstract: A method for stretch breaking fibers to produce a staple yarn and operating a staple fiber spinning machine that enables the production of a plurality of products of lot size smaller than a large denier tow product. The process includes at least two break zones and a consolidation zone downstream from a second break zone to form a staple yarn. The filaments are broken in a second break zone downstream from the first break zone by increasing the speed of the fiber fed into the process.
Type:
Grant
Filed:
January 5, 2005
Date of Patent:
July 14, 2009
Assignee:
E.I. du Pont de Nemours and Company
Inventors:
Joseph Anthony Perrotto, Peter Popper, Glen Simmonds, Albert S. Tam, David Carlton Visser, William Charles Walker, Joseph Leonda Jones
Abstract: A method for starting or stopping each of at least two separately controllable roll-sets (22, 26, 34, 56) used for processing a yarn (Y) in a stretch-break process, each roll-set comrpising at least two rolls, the method is characterized by the step of each roll-set, changing the speed of each roll from an initial condition to a steady state condition in accordance with a predetermined sequence and in coordination with a change in speed of at least one of the other rolls, such that simultaneous complete breakage of a yarn (Y) being processed in a stretch-break process is minimized.
Type:
Grant
Filed:
December 12, 2003
Date of Patent:
March 25, 2008
Assignee:
E. I. du Pont de Nemours and Company
Inventors:
Gregory James Scott, Joseph Anthony Perrotto, Glen Edward Simmonds, Richard Davis Bryson, William Robert Corcoran, William Charles Walker
Abstract: A method for stretch breaking fibers to produce a staple yarn and operating a staple fiber spinning machine that enables the production of a plurality of products of lot size smaller than a large denier tow product. The process includes at least two break zones and a consolidation zone downstream from a second break zone to form a staple yarn. The filaments are broken in a second break zone downstream from the first break zone by increasing the speed of the fiber fed into the process.
Type:
Grant
Filed:
June 13, 2000
Date of Patent:
September 5, 2006
Assignee:
E. I. du Pont de Nemours and Company
Inventors:
Joseph Anthony Perrotto, Peter Popper, Glen E. Simmonds, Albert S. Tam, William Charles Walker, Joseph Leonda Jones, Peter Artzt, Heinz Mueller