DE1660297A1 - Method and device for the manufacture of fiber products by asymmetrical spinning of filaments - Google Patents

Description

CARl FREUDENBERG · '"8Ϊ1ΪΛ965

Weinheim / Bergstrasse Dr.Z / Rh OF 391

Method and device for producing τοη Fiber products by asTam · trie before s spinning

of rows of filaments

In the manufacture of fiber products by melt spinning that the molten filaments emerging from the spinning holes are stretched with the help of air currents, that's over Spinning speed and air speed obtained. Warpage ratio for the achievable strength of the thread of Meaning. As a result of the warpage, a longitudinal orientation occurs, as is known. tion of the molecular chains, which can be frozen by precisely targeted cooling. For the achievable orientation effects, the heat transport from the fiber interior to the. surface and then to the ambient air of importance in order to obtain the orientation obtained during the warping. The sheath-to-core ratio of the thread gains in importance because the heat dissipation goes much faster from the thread surface than from

the middle of the thread towards the surface. In the German patent. *. *

(Registration F 44 310 VIIa / 29a dated October 24, 1964) was therefore already suggested, profiled instead of round spinal holes «to use. The spinning lids are in

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so that flocks of filaments are formed. Each from one The flock coming from the spinneret is then picked up by one, but preferably several, air stream pairs and guided away from the nozzle. The pairs of air flows enter slots on both sides of the filament Bchar, which are either on the nozzle or in So-called. Guide channels are attached. The guidance of the air streams is handled in such a way that the filaments of each nozzle remain separated from one another, so that the drafting process can take place evenly. The filament bundles that ultimately emerge from the channels are finally placed on a sieve belt, e.g. in the form of a fiber fleece, vacuumed. The mutual matting comes from the close spacing of the spinning holes and due to the high ratio of spinning speed to screen belt speed (e.g. 100: 1), whereby a reciprocal, irregular, loop-shaped deposit is achieved.

Because by the row-like arrangement of the spinning orifices and by the arrangement of the air streams in pairs, the rows of filaments are acted upon by the air streams on both sides It is possible to create tension within the threads, e.g. by the fact that the air currents to the left and right of the crowd have different temperatures. These tensions can be »besides other effects, e.g. crimping of the threads. This is desirable for the use of textile-like products as possible. These AerpMtrle of the thread sheets is also essential for felting, since the threads in the catchment area of the sieve belt should have a turbulence in order to achieve a tangled fiber structure « According to the invention, there was now a further improvement in this

Effects from the fact that the Aüjnnrmetri · within the thread row

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iAD ORIGiNAL

is increased. One embodiment is shown in FIG. Here a row a) of ypsilon-like spinning openings is shown, which are mutually offset from one another. On both sides of the row there are two air slots b ₁ and b ″, from which air streams emerge which grasp the filaments emerging from the spinning orifices and tear them forward. As a result of one of the longer legs, the spinning orifices produce a thread which is asymmetrical in cross section and which is drawn and cooled by two opposing air currents. One longer leg experiences different cooling conditions on the flight path than the two short legs, so that tensions occur in the thread, which lead to crimping, for example. Due to their staggered arrangement, adjacent threads generate the tension in a mirror image. When the threads are caught in the form of a tangled fiber fleece, this phenomenon contributes to increased felting, since the crimping is accompanied by shrinkage, which changes its direction in the case of adjacent threads. The asymmetry can be further increased by choosing different temperatures of the air flow pairs, for example b 1 y b 2. Furthermore, the asymmetry of the profile can be further increased so that correspondingly different cooling conditions also occur.

For example, the one shown in Fig. 2 can be used as the basic structure of the spinneret. Other constructions can of course can be used, as long as the principle is maintained, rows of filament sheets spun out in rows with on both sides

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to stretch the gripping airflow pairs and to guide them in such a way that they are led away from the spinneret in web form. In Fig. 2 a spinneret with a row A is schematically asymmetrical arranged Ypsilon cross-sections shown. On one side, the top plate B is created, with which the row of spinning holes The supporting nozzle web C forms the air slot D. On the other hand, the top plate B is the better one The overview is omitted to show the principle of the air supply. The air is from behind by two Openings of the groove Dp supplied, from where they through the webs F passes into the groove E in order to be fed to the outlet opening D from there. Due to the amount of air fed in then emerge from the two columns D on both sides of the spinning hole row air currents, which tear the filament pure forward and stretch. After leaving the spinneret, the filament row becomes introduced into a guide channel, into which further air flow pairs, e.g. for faster cooling. In addition, several spinnerets are combined into one unit, as described in one embodiment in French patent 1,364,916. The first pair of airflows can in other embodiments are also only applied within the guide channel, but is always on both sides of the Filament row arranged.

Examples

A spinneret of the type shown in Fig. 2 with the following dimensions was used:

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3
0.3
340
378 well
mm
mm
well 0.5
0.35 well
mm 150 300 mm

Bar width 0: air slot width D: air slot width ϊ nozzle width:

Ypsilon spinning opening:

Long bar slopes: Short side lengths:

Number of spinning holes: length of the row of spinning holes ι

Inlet width of the guide channel: 380 mm

Inlet width of the guide

channel: 15 mm

Length of the guide channel 600 mm

Polycaprolactam was used as the spinning substance, with a viscosity number of \ o _red = 2.25 (HgSO.) And an extract content of 0.3 $> The polymer was melted in the extruder and ^{metered into a nozzle of 240 0} O with the aid of a spinning pump The delivery rate was 0.3 ecm per minute. Was the two nozzle slots, air was of 238 ⁰ C in an amount of L _t 7 War / mLn 'supplied so that an outflow of the air of 190 m / sec reached in the slots. The two air currents tore the filament rows forward and stretched them out,

so that a balanced titer of 1 den was obtained. Si Filament · were collected on a wire screen after the Leaving the above-described guide channel "is collected in the form of a tangle. The fleece showed a significantly increased Puffiness is good for you from round holes - • fail.

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Claims (1)

Claims Process for the manufacture of fiber products from high polymers by melt spinning filament sheets in a straight line next to each other lying spinning orifices and drawing by means of air currents attacking the filament sheets on both sides, thereby characterized in that the spinning orifices have an aeyametric Have cross-section and are alternately arranged in mirror-inverted direction in the row. INSPECTED 109815/1914