Method and apparatus for producing a draftable twisted roving
AssigneeRieter Machine Works, Ltd.
InventorPeter Novak
Life of this patent
Estimating the term…
Abstract
The supplied strand is provided with a permanent twist due to the rotating balloon and a superimposed false twist due to a false twist device prior to winding onto the bobbin package. Prior to winding on the package, the false twist is eliminated so that the resultant roving has relatively high breaking strength for handling purposes while remaining draftable. The false twist device is located between the delivery rolls and spindle to rotate coaxially around the spindle and may be driven by the balloon or by a positive drive.
Claims22
A method of producing a twisted draftable roving comprising the steps of
- supplying a continuous strand of parallel substantially twist free fibers from a delivery point of a rotating bobbin at a winding station at a predetermined speed;
- forming the supplied strand into a freely rotating balloon about the bobbin between said delivery point and said winding station to impart a permanent twist in the strand therebetween;
- superimposing a false twist in the strand between said delivery point and a second point upstream of said winding station to increase the twist in the strand between said points;
- and
- thereafter eliminating said false twist in the strand between said second point and said winding station prior to winding of the strand onto the bobbin at said winding station wherein the distance between said second point and said winding station is smaller than the length at which the roving still containing the permanent twist slides apart under tension, whereby a twisted draftable roving is formed into a package on the bobbin.
An apparatus for producing a twisted draftable roving comprising
- a fiber supply device for continuously supplying a strand of parallel substantially twist-free fibers in the form of a small sliver;
- a rotating spindle for mounting of a bobbin tube thereon to receive the supplied strand thereon to form a roving package while forming the supplied strand in a rotating balloon coaxially of said spindle between said supply device and said spindle;
- and
- a false twist device between said supply device and said spindle in the zone of said balloon for passage of the strand therethrough, said false twist device being rotatable about said spindle to impart a false twist in the supplied strand between said devices.
Dependencies are inferred from the claim text.