Plastic article or earthenware shaping or treating: apparatus – Immersed shaping orifice discharging directly into liquid...
Patent
1996-01-05
1998-02-03
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Immersed shaping orifice discharging directly into liquid...
425 69, 425 71, 425 722, 4251925, 264188, B29C 3506
Patent
active
057141720
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention refers to a spinning device for the production of man-made fibres, particularly cellulose regenerated fibres. Well-known spinning devices, for the production of cellulose regenerated fibres for example, operate on the principle that a viscous spinning solution or spinning mass e.g. viscose is pressed by means of pumps through a spinneret into an aqueous precipitation bath containing chemical additives. A filament of regenerated cellulose is thereby formed as a result of viscose decomposition which is drawn off via rollers or something similar whereby stretching of the filaments generally takes place in the precipitation bath.
An example of a spinning device built in the traditional fashion is illustrated in "Man-Made Fibres Using the Viscose Process" by K. GOTZE, 3rd Edition, Volume 2, Springer Publications Berlin/Heidelberg/New York (1967) on p. 850. The device is made of a bath-like container on which spinning pumps are arranged in the longitudinal direction which transport the spinning solution (viscose) via feed pipe lines to a spinneret. The bath-like container contains the precipitation bath into which the spinneret is dipped whereby the openings of the spinneret are aligned so that the fibres emerging from the spinneret emerge in a substantially vertical direction. The feed pipe lines for the spinning solutions are pivoted around joints which means that the spinneret can be swivelled out of the container during maintenance work, or when disconnecting the line.
The development of new types of fibres with special properties has meant that numerous parameters in the spinning process for the production of cellulose regenerated fibres have been changed. Amongst these parameters one can for example count the retention time of the filament in the precipitation bath which is adjusted by the take-up speed, and in particular by the immersion path of the filaments in the precipitation bath. In this way, an effort was made in particular to extend the immersion path.
The immersion path can be extended if, for example, the emerging filament is not drawn off substantially vertically but rather emerges from the spinneret in more of a horizontal direction by using a flatter container and is drawn off horizontally thereby being immersed in the precipitation bath for a longer distance in this container.
By this measure the immersion path is extended, however, the use of a flat container and the drawing-off of the filament in the horizontal direction on the one hand demands a considerably greater amount of space and on the other hand, the filament has to be led around rollers, or a similar device, which has a negative impact on the fibre properties.
A second possibility to extend the immersion path is to design the container with the precipitation bath deeper with respect to a drawing-off in vertical direction. Until now, this could only be achieved to the extent that it was still possible to swivel the spinneret out from the deeper container according to the length of the feed pipe line. Since in order to effectively be able to bring the spinneret into the deep parts of the container, which is necessary to achieve a longer immersion path, it is also necessary to correspondingly extend the feed pipe line. However, it is not possible to swivel the spinneret out of the container once a feed pipe line of a certain length is used. This can only be done once apparatus parts obstructing the swivelling process have been removed.
SUMMARY OF THE INVENTION
It is an object of the present invention to arrange a spinning device on the basis of the principle described above so as to make it possible to provide a deeper container for the precipitation bath so that the immersion path can be prolonged and, at the same time, the spinneret can be easily swivelled out of the container.
According to this invention this object is reached by means of a spinning device for the manufacture of man-made fibres, and in particular cellulose regenerated fibres, comprising at least one spinning pump, at
REFERENCES:
patent: 2198448 (1940-04-01), Allquist
patent: 2243116 (1941-05-01), Ostermann
patent: 2533103 (1950-12-01), Givens et al.
patent: 2586970 (1952-02-01), McDermott
patent: 2611925 (1952-09-01), Merion et al.
patent: 2624070 (1953-01-01), McDermott
patent: 2803851 (1957-08-01), Bavnlich et al.
patent: 2920346 (1960-01-01), Yori
K. Gotze, "Man Made Fibres Using the Viscose Process" vol. 2, 3rd Edition, Springer Publications, Berlin/Heidelberg/New York (1967) pp. 847-853.
Lenzing Aktiengesellschaft
Schwartz Iurie A.
Woo Jay H.
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