Application of a vaporous mist for spining systems with...

Plastic and nonmetallic article shaping or treating: processes – With step of cleaning – polishing – or preconditioning...

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C264S169000, C264S211170, C425S072200, C425S19200R, C425S225000, C425S463000, C425S464000

Reexamination Certificate

active

06790392

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to the use of steam misting in the production of polyamide filaments, especially for rectangular spinning nozzles in accordance with the bottom loading concept and a spinning system equipped therewith.
In the spinning of polyamides, especially for polyamide 6 (nylon 6), during the discharge of the filaments from the spinning nozzles monomers and oligomers in the form of unpleasant smoke clouds are produced which can be released in an uncontrolled manner into the surroundings. In order to prevent this, these emissions can be evacuated via suction nozzles which must be provided as close as possible to the spinneret outlets. The functions and the shapes of such suction nozzles have been made known in DE 198 36 682.5. From DE 198 30 453.6 it is known, further, that superheated steam which serves to moisten the polyamide filaments and to support the suction effect, can simultaneously increase the wiping interval time for the spinning nozzle when blown directly thereagainst.
Conventional devices which serve for the aforedescribed purposes are damaged however during the cleaning or replacement of the nozzles. Thus it has been, for example, proposed at one time to provide the conventional nozzle misting so that the steam is blown onto the longitudinal side of a rectangular nozzle stack centrally against the side wall of the relevant nozzle stack so that it then flows in the gap between the nozzle stack and the nozzle shaft in the spinning beam downwardly and is rerouted by a baffle plate more or less uniformly in the direction of the spinning plate. This device is, apart from the insufficiency of the moisturization produced, not usable for rectangular nozzle stacks in accordance with the bottom loading concept, is effective even to a lesser extent than is the solution for round spinning nozzles from the application DE 198 30 453.6 which differs based upon the after-heater which is directly following and also is not practical.
OBJECT OF THE INVENTION
Thus it is the object to provide a reliable apparatus, which is service-friendly and is easy to clean, for the steam moisturization of rectangular nozzles.
SUMMARY OF THE INVENTION
The advantage of the new steam misting resides in the good temperature control of the steam, whereby the steam feed is effected through a tube loop which passes through the heating chamber of the spinning beam so as to bring the steam up to the spinning temperature. Advantageously, the steam outlet bars are directly below the spinning beam and thus on the lower edges of the rectangular nozzle stack connected therewith, between the spinning beam and the after-heater. These steam outlet bars are equipped with a simple labyrinth for pressure equalization which can be fabricated especially inexpensively. The steam inlet is effected initially respectively centrally to the rectangular nozzle stack and into an upwardly open and relatively broad distribution chamber along the rectangular nozzle stack.
This vertical distribution chamber transitions into a horizontal and very narrow gap space which opens into the spinning chamber. As the steam enters into the latter, the steam is spread out and uniformly flows in the direction of the nozzles. This is so effective that a misting from the ends inwardly is superfluous.


REFERENCES:
patent: 4124668 (1978-11-01), Frohn
patent: 2630055 (1978-01-01), None
patent: 292275 (1991-07-01), None
patent: 292684 (1991-08-01), None
patent: 0971056 (2000-01-01), None
patent: 52027814 (1977-03-01), None
patent: 56134206 (1981-10-01), None

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Application of a vaporous mist for spining systems with... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Application of a vaporous mist for spining systems with..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Application of a vaporous mist for spining systems with... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3206200

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.