Spin beam for spinning a plurality of synthetic filament yarns a

Details Spin beam for spinning a plurality of synthetic filament yarns a Spin beam for spinning a plurality of synthetic filament yarns a

1996-11-20

1999-07-13

Pyon, Harold Y.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

Orifice for filaments or fibers

4253782, 4253822, 425463, 425464, D01D 406, D01D 5092

Patent

active

059223626

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a spin beam for spinning a plurality of synthetic filament yarns and a spinning machine or spinning line comprising such a spin beam.
A spin beam for spinning a plurality of synthetic filament yarns, wherein the spinnerets are arranged in a row, is known from EP 163 248 B and corresponding U.S. Pat. No. 4,698,008. A spinning machine comprising a spin beam of this type is disclosed, for example, in DE-PS 24 38 364, DE-PS 41 03 990, or published Application DE 195 13 941 A1. The arrangement of the spinnerets in a row results in a great extension of the spinning machine in the longitudinal direction.
EP 0 285 736 discloses a spin beam which includes two parallel rows of spinnerets, and two parallel cooling chambers arranged below respective ones of the rows of spinnerets. With this apparatus, it is possible to spin a yet larger number of filament yarns in an arrangement that is as compact as possible and, in particular, to avoid irregular heat losses, which may lead to inhomogeneities in the yarns.
As a function of different process parameters in the melt spinning, it is yet impossible to obtain a homogeneous quality of the yarns from row to row despite a very compact construction of the spin beam. While these differences arising from the production of manufactured fibers may be compensated by a subsequent blending of the staple fibers to be spun, they are also noticeable in the winding of the filament yarns to packages and in the further processing thereof.
It is therefore the object of the invention to at least compensate for such differences in quality.


SUMMARY OF THE INVENTION

The above and other objects and advantages of the present invention are achieved by the provision of a spinning apparatus which comprises a spin beam in the form of an elongate rectangular enclosure which includes a top wall and a bottom wall, and with the bottom wall having a plurality of connections therein which extend along two parallel side by side rows. A spin pot is received in each of the connections, with each spin pot including a spinneret at the underside thereof, and a pair of pumps is mounted adjacent the top wall of the beam, with each of the pumps having multiple outlets. One of the pumps is located generally above one of the rows of connections, and the other of the pumps is located generally above the other of the rows. Also, a plurality of distribution lines extend from respective outlets of each of the pumps through the spin beam and to respective ones of the spin pots of its associated row of connections.
The spin beam of the present invention has the advantage that all spinnerets are accommodated in a single heating enclosure. The length of the heating enclosure is defined such that no temperature differences may result over its length, and that each row of spinnerets is associated to a multiple spin pump. This has also the special advantage of greater flexibility, since a breakdown of one of the pumps does not require a shutdown of the entire spinning machine.
The spinning machine of the present invention further comprises an air distribution enclosure positioned below the spin beam and between the rows of connections. The air distribution enclosure is of rectangular outline when viewed in horizontal cross section so as to define two outer side walls which extend parallel to the rows of connections and downwardly from the enclosure of the spin beam, with the outer side walls being air permeable so that cooling air introduced into the air distribution enclosure passes through the outer side walls and transversely across the filaments being extruded through the spinnerets. This construction permits the air distribution enclosure to be designed so narrow that it can be accommodated between two rows of closely arranged spinnerets. The air distribution enclosure may be divided by an internal partition to form two chambers which are separate from one another and supplied with air from two separate blowers. For a uniform cooling of all filaments emerging from th

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