Textiles: spinning – twisting – and twining – Apparatus and processes – Open end spinning
Patent
1986-06-30
1988-01-12
Watkins, Donald
Textiles: spinning, twisting, and twining
Apparatus and processes
Open end spinning
57408, 57413, D01H 7895, D01H 7892
Patent
active
047182270
DESCRIPTION:
BRIEF SUMMARY
The instant invention concerns an open-end spinning process in which a mass of fibers in the form of a band is separated into separate fibers and in which the separated fiber material is fed to a collecting surface in an air stream, then to be drawn off from said collecting surface while being twisted, and further concerns a device for the implementation of said process.
Among the different open-end spinning processes the open-end rotor spinning process and the open-end friction spinning process have gained considerable importance. The latter has the special advantage over the rotor spinning process of requiring lower RPMs of the spinning elements than in the rotor spinning process, while higher production speeds are nevertheless attainable. The thinner yarns can be spun more efficiently. However, the quality of the yarns produced by the friction spinning process is unsatisfactory because the individual fibers are not fed into the spinning nip in a parallel position to the yarn axis as would be required for their orderly incorporation into the freely rotating yarn end. Measures have been proposed in the past in order to bring the fibers into a position which is nearly to the yarn axis as they are fed into the nip, for example mechanically, by means of a centrifugal disk (DE-PS No. 2,720,625) or pneumatically, by means of a cascade-like increments of the air pressure in the path of the fibers (DE-OS No. 2,732,678) or by feeding the fibers at an oblique angle in relation to the direction of thread draw-off, combined with an air stream essentially parallel to the thread axis (DE-OS No. 2,943,063). Yarn quality is not satisfactory however, in spite of these measures, especially at high spinning speeds.
It is the object of the instant invention to create an open-end spinning process making it possible to produce a yarn of good quality at high production speeds, and to create the device for the implementation of this process.
This objective is attained by the instant invention with a process where the fiber material, in the form of individual fibers, is deposited on a collecting surface moving in the thread draw-off direction and is drawn off continuously from said collecting surface in the form of a thread while being twisted. No fibers are added on to the already finished thread but are always fed to the thread end.
Oriented depositing of the fibers on the collecting surface is obtained by feeding the separate fibers in direction of the collecting surface's movement. The doubling process is separated from the spinning process by bundling and/or doubling the fiber material on the collecting surface into a fiber bundle containing the fiber mass required for the desired thread. The twisting operation is carried out suitably by a known twisting mechanism, independently from the collecting surface. Provisions can be made here for the fiber sliver being formed on the collecting surface to be deposited into the spinning nip formed by two cylinders in close proximity to each other and driven in the same direction, to be twisted into a thread and to be drawn off in continuous operation.
The device to carry out the process is characterized by a collecting surface moving in the direction of the thread draw-off and followed, in the direction of thread draw-off, by a twisting device and by a draw-off device.
In a preferred embodiment the collecting surface is placed on the periphery of a disk-like cylinder. The surface speed of the collecting surface is approximately equal to that at which the thread is drawn off, so that the full mass of fibers required to form the finished thread is collected on the collecting surface and is conveyed in form of a fiber bundle in the direction of the twisting device where it is twisted together into a thread.
Doubling does not take place in the rotating zone but in a rotation-free zone. This separation of rotation and doubling produces a yarn of good quality.
A delay and the ensuing further parallel positioning of the fibers as well as doubling of the fibers on the collecting surface, (sa
REFERENCES:
patent: 3885772 (1974-12-01), Burlet
patent: 4315398 (1982-02-01), Parker et al.
patent: 4479348 (1984-10-01), Yasui et al.
patent: 4489540 (1984-12-01), Faure et al.
patent: 4522023 (1985-06-01), Stahlecker et al.
Dority Julian W.
Schubert & Salzer
Watkins Donald
LandOfFree
Open-end spinning process and device for its implementation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Open-end spinning process and device for its implementation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Open-end spinning process and device for its implementation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-914427