DE1956860A1 - Spinning chimney or spinning chute - Google Patents

Description

PAT2NTANV.'SiTE

,. DR.E. WIEGAND DIPL-ING. W. NIEMANN 1 9 5 R fi R Π

DR. M. KÖHLER DIPL-ING. C. GERNHARDT 3 P ü O U

MÖNCHEN HAMBURG TELEPHONE 55547 «8000 MD N CHEN 15, TELEGRAMS: KARPATENT 'NUSSBAUMSTRASSE 10

12 "November 1969

>. 14 565/69 13 / RS

Monsanto Company St. Louis, Missouri (V.St.A.)

Spinning chimney or spinning chute

The invention relates to a method for producing synthetic threads, yarns and ribbons or the like. from fiber-forming polymers. In particular the invention relates to improvements in that for cooling the molten structures emerging from a spinneret injected or extruded Contraption.

In practice, melt-spun threads are squeezed out or extruded out of a spinneret and passed into a spinning chimney or spinning chimney or into a cooling or quenching chamber, in which they are fed to a stream of a quenching

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or subjected to cooling medium in the cross-flow direction will. "

It has "hitherto been a number of different spinning canals." or spinning chutes "are known, all of which suffered from various defects and generally did not were suitable. Some had the disadvantage of being a

uneconomical volume of air or cooling medium for Obtaining the desired result was required. Others showed the defect that a large amount of the used Air was wasted and never reached the threads. Others had the disadvantage that they were bulky " or obstructive bind, while still others are structurally uneconomical and / or unsuitable.

One of the major drawbacks of some of the spinning chutes or chutes known in the art to date is the quality of the threads produced with it, which is worse overall.

The object of the invention is therefore to provide an overall improvement in such properties as uniformity of the titre, Strength and dyeability of the spun threads, and the creation of a spinning shaft or spinning chimney in which more efficient use is made of the cooling medium.

The disadvantages outlined above are overcome according to the invention by the use of a spinning chimney or spinning chimney and the rapid cooling of molten polymeric threads is thus achieved, the spinning chimney being characterized in that it has a rear side and side walls , the side walls being

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de (1) converging walls that coincide with the path of the filaments from the spinneret to the convergence guide, and (2) diverging blades which communicate with the leading edges or edges of the walls. That Cooling medium gets into the chimney and over, the threads through steered the back wall of the chimney, which is provided with small openings or "holes" over part of its upper half

is. - · ■.

The invention is explained in more detail below with reference to the drawing. ^v .

Fig. 1 shows a perspective view Spinning channel or spinning shaft, which is designed according to the invention and in connection with a spin pack a convergence guide and a filling chamber (plenum öhamber) is shown.

Fig. 2 is an upright sectional view taken along line 2-2 of Fig. 1 and illustrating the spinning chimney; the filling chamber, the convergence guide and 'a spin pack. .

The preferred embodiment as shown in Figs 2 generally includes a filling chamber 16, one Spin pack 14 including a spinneret, a: protective or front plate 13 which is used to protect the spinneret surface, a convergent spinning chimney or spinning shaft, indicated generally by the reference numeral 1, is used becomes, - and a convergence guide 15 · The filling chamber 16 has unperforated top, bottom and 'side walls and a front distribution plate 12 suitably perforated. The spinning chimney 1 has pages which are formed from walls 2, whereby a plurality of

0 09 8 21/18 3 5

Threads 17 move directly from the spin pack 14 to the convergence guide 15. In the embodiment shown, the walls 2- extend perpendicularly from the rear wall 11 for a distance, the ends of which form leading or guide edges 4 which are connected at a certain angle with diverging wings or surfaces ^ which can be formed integrally therewith.

As shown in Fig. 2, the walls.2 are essentially trapezoidal in shape, with their parallel sides (edge sides) their upper and lower sides are. The wings 7 have a substantially right-angled triangular shape, the HypotJ-.enusen with the Leitoder Leading edge η 4 of the walls 2 are in connection, the be held in place by any suitable means. The upper part or a main part the upper half of the rear wall or back 11 of the chimney 1 is occupied by the distributor plate 12 and the lower part of the rear wall 11 is either open or it can be occupied by a plate.

Depending on the length of the chimney or shaft, to be used, a larger area of the back or rear wall of the fireplace may be required in order to obtain the desired flow and distribution of the cooling medium. In other words, at shorter chimneys a main part of the rear wall with opening be provided or open to accommodate or receive a distribution plate.

It is also possible to incorporate or build in the prescaler plate 12 in the chimney structure and to position it in front of a suitable opening for attachment to the bed of the filling chamber in a covering arrangement or relationship.

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see. A cooling or quenching flows in each pail. ' medium, usually air, under pressure through the perforated plate 12 into the chimney 1, .. to across the threads 17 to flow.

While the walls and wings are preferably planar and meet at an angle of less than 180 °, this does not mean that they cannot be curved and meet at an angle greater or less than 180 °. When the curved wings and walls meet at 18o ^y a continuous curved surface is formed.

As can be seen from Fig. 1, the trapezoidal walls 2 converge towards the lower end or the Bottom of the chimney 1 in such a way that it follows the path of movement (flow) of the threads 17 from the spin pack 14 to the convergence ζ guide 15 adapt, the walls 2 are very adjacent to the paths of movement of the outermost threads.

Usually the illustrated device is physically located above its associated winding or winding area and the threads 17 pass through it in a downward direction. In some prior art cases, when the apparatus is put into operation, a bundle of filaments is forced down through a transfer or conveying tube to the winding area with the aid of compressed air. Once the individual filaments and the bundle as a whole are passed through the tube run appropriately, they are separated and placed on a convergence guide.Another possibility is to apply a vacuum to the bottom of the transfer or conveying tube, the filaments being pulled out through a flexible hose called the

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suitably connected to a blower and filter system »The hose can be used to pull off the threads can be used in a waste collection system while the individual threads are spun or unwound.

It is readily apparent that the structure of the Chimney according to the invention allows an operator to thread the threads through the floor of the chimney Twist or muline by hand in the winding area below, which leads to expensive tubes and ■ Vacuum devices are switched off. The structure of the chimney is such that the threads are drawn together through the floor or when thrown.

In normal operation, the cooling or cooling flows; quenching medium in cross flow through "the threads 17" at a

sufficient speed, as in a use-;

borrowed a rectangular chimney or chimney. Each- ■

but here is a more effective use or exploitation

of the medium present, since the decrease in the cross-sectional " Ί area of the flow path through the chimney results in a decrease in the total air flow while maintaining the

same flow velocity allowed. 'ι

The uniformity of the air flow velocity I.

across the chimney or shaft, as shown in Fig. 2 by the j

Arrows indicated is greatly improved, whereby j striking improvements in the physical intrinsic. \

shafts of the spun threads in addition to a noteworthy;

borrowed decrease in the requirements of the cooling | mediums are obtained.

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Experiments were carried out during the spinning of polyester fibers or threads (polyethylene terephthalate), the polymer implementation rate being 39 »9 kg / hour. (88 pounds per hour). Using a rectangular chimney or chimney with an air flow of 28,317 l / min (lpoo cf / m) at 20 ° C, threads with a coefficient of change in liters of 20%, determined by means of photomicrographs of paser cross-sections, were produced. Fibers or filaments spun through the chimney or chimney according to the invention with an air flow of about 14 158 l / min (500 cf / min) had a coefficient of deviation of the denier of 14 $ with an air flow of about 14 158 l / min (5oö cf / min) through a rectangular chimney or shaft was only a very am

occurring
Edge / chill caused as indicated by non-chilled filaments which regularly broke and were blown out of the chimney, while in the chimney according to the invention the spinning was continuous and satisfactory and the lowest limit or lowest level at about 8191 l / min (35o cf / min) was 20 ° C.

As shown by the arrows in Figure 2, the cooling or quenching medium flows into the chimney or chimney through the apertured plate 12 and exits through the front of the chimney and between the blades. With a trapezoidal chimney, the free space for the outer wasteful, air flow is reduced in the front part of the chimney or duct to a minimum ^v, whereby the main part of the medium is forced to flow in the transverse direction to the yarn bundle. In a rectangular fireplace there is a relatively large amount of unprofitable, or superfluous, space for external or unpleasant flow, including the sides of the fireplace

Bundle available. Smoke sample tests showed that the flow in these side corners of a rectangular chimney creates a considerable amount of turbulence. It is believed that the reduction of this turbulence according to the invention in part for the improved Quality of thread spun through a trapezoidal chimney or chimney is responsible.

It is believed that the wings or airfoils any stray air currents within the room for influencing the thread bundle as it passes through

available*

the-chimney / hold. Convection and other currents could possibly alter or hinder the uniform movement of the threads.

Another theory that the successful operation of the chimney or shaft according to the invention can be based on the fact that there is turbulence Air or a medium flowing past some edge or edge is present and that through the Presence of the wings or airfoils on the leading or leading edges of the walls an edge or an edge that creates a perceptible turbulence from which the thread bundle is shifted further away.

A distinct advantage, while not affecting the quality of the threads or the operation of the chute, is that there is less likelihood of an operator being injured if the yarn or bundle twisted through the ground to the winding area below becomes · '..- ■.

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The improvements made in accordance with the invention described above in connection with. the use of polyester have been described, can in the same way in the melt spinning of any organic, fiber-forming Masses are preserved.

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Claims (7)

- Io - Claims IJ spinning chimney or spinning shaft, characterized in that that it has a rear wall (11) and side walls (2), the. Side walls comprise walls (2) that converge from top to bottom and which extend from the rear wall (11) of the chimney (l) to a distance, the ends of which form leading or leading edges (4), those at an angle. 1 with diverging wings or Wings (7) are in communication. 2. spinning chimney or spinning shaft according to claim 1, characterized in that the wings · or wings (7) are planar. 3. spinning chimney or spinning shaft according to claim 1, characterized in that the walls (2) are planar. 4. spinning chimney or spinning shaft according to claim 1, characterized in that the walls (2) from the The rear wall (11) of the chimney (1) extend vertically. 5. spinning chimney or spinning shaft according to claim 1, characterized in that the walls (2) are substantially trapezoidal, the upper ones and lower ends form the parallel sides. 6. spinning chimney or spinning shaft according to claim 1, characterized in that the wings or wings (7) essentially have a right-angled triangular shape, the hypotenuses of which correspond to the leading or leading edges (4) of the walls (2). 009821/1835 7. spinning chimney or spinning shaft according to claim 1, characterized in that the rear wall (11) of the Chimney (1) is provided with holes or openings over part of its upper half 821/1836 empty soap