DE2539840A1 - PROCESS FOR THE SAFE SPINNING OF POLYFILE FEMES WITH RELATIVELY HIGH STRENGTH AND SUITABLE SPINNING NOZZLES - Google Patents

Description

2539 & 40

"Method u for safe spinning polvfilen threads with relatively high strength * wl ^ u

The invention relates to a method and a device for sioheren spinning with polyfilament threads relatively high strength, preferably made of thermoplastic masses, especially at high speeds

The influence of fluid and / or gaseous media in the spinning process is assessed differently on the one hand there is no noticeable air resistance, for example Influence is admitted, on the other hand formulated HAMAlTA Ue a, an empirical equation, near the the thread tension is essentially dependent on the air friction. After that, the thread tension is the length the spinning paths proportional · A direct application of this relationship is given fineness and definite Thread speed not possible because the thread tension necessary for each capillary titer is a Change in the length of the spinning path makes it necessary «(The terms capillary and capillary fineness correspond corresponding to the terms elementary thread and elementary thread no it.)

Such a method cannot be used without great effort in the spinning mill and one is forced to the maximum necessary path length z. B. to use for the coarsest capillary or the thread tension with expensive means, e.g. B. to be controlled with additional roles

It is also known that the DUsenbohrungen in circles be arranged, in the Eegel the distance of the Holes on the inner and outer bolt circle approximate

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equal · is · Neighboring hole circles are also in arranged at greater intervals. Usually z. B. with two hole circles a ratio of about

\ 1: 1.8 of the Loohkreis Durachesser used. Other common forms of arrangement are in one or more rows, mostly staggered brooks Another possibility are the nozzles arranged at certain angles and with different loops enable.

The necessary minimum distance is generally chosen so that that the capillary threads do not stick and the evenness is not impaired.

The purpose of the invention is to use the known Haohteile of Eliminate prior art.

The object of the invention is to ensure the reliable spinning of polyfilament threads with relatively high strength, e.g. B «off thermoplastic masses, especially at high speeds with the simultaneous use of a Device to enable.

It has been found that a higher spinning process is more polyfilament Threads is achieved when the individual capillaries of the thread bundle to be produced after leaving the Spinneret duroh one or more fluid and / or gaseous media are passed that have the same resistance towards each of the individual capillaries, with the same resistance being generated by a flow constant adapted Looh arrangement with circular shape and constant hole spacing or according to the Looh arrangements of the nozzle bores for this purpose according to the invention Devices is achieved.

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It is two-way to guide the capillaries of the thread bundle from stationary, stationary parts or walls at a distance of = 1 om. If individual capillaries of the thread bundle run away at a distance of C 1 om, there is an influence. The threads are _{kept away from the walls by known means t} z · B, by suitable thread guides.

The directed flow of fluid and / or gaseous media can be directed in the direction across or against The thread path can thus be influenced in addition to the level of resistance. It is also advantageous to use uncontrolled, i.e. h · to switch off predominantly turbulent flows; accordingly, there should be largely laminar flow.

The threads can pass through several different treatment zones along the thread path in which they are different be tempered

Air, water vapor, inert gases with different temperatures can be used as media.

The level of the same resistance can advantageously be set by bringing the capillaries together prematurely. This is e.g. B, possible with known ones pneumatic or mechanical twist generators or by thread locking devices based on air turbulence work·

Furthermore, the level of the same resistance can be changed in length by MN in the direction of the thread wave Manhole and a correspondingly adjustable guide element with or without a preparation system are set will·

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Another way of setting the level of the same resistance is to choose the distance between the holes of the nozzle bores

The filing or winding takes place directly afterwards or after a relaxation section and / or after further process steps, for example stretching.

A spinneret, in which the arrangement of the bores in two rings takes place, the ratio of the Durohmesser of the outer ring to the diameter of the inner Ring is about 1, the holes between the rings are preferably offset, between and on the rings neighboring holes have a distance of = 2.5 mm and the diameter of the inner ring = 15 mm

The arrangement in rings is expedient and advantageous, but it is also possible to use spinnerets with Fläohen-shaped and / or row-shaped arrangement of the holes, which by a larger number of the edge of the Borehole arrangement or at the end of the row boreholes compared to the number of boreholes within the Areas or rows is marked

It was found that an equal resistance at the usual arrangements in rows or rows with the same Looh spacing within a row is not achieved will · So stepped capillary broth at high speeds of the eocapillaries in the case of arrangements in several hole circles with the usual dimensions, because with such effects the achievable strength is relatively low

It is necessary to remove any additional resistance, especially at the edge capillaries, in the case of the usual arrangements and the differences between capillaries with unequal

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switch off at a moderate distance · Outside and dependent each capillary is subject to the distance of the thread bundle a corresponding resistance, which increases linearly with increasing path length with constant distance. In the bundle, on the other hand, there is only a fraction of the corresponding resistance on the individual capillary.

Thus, according to the invention, the resistance can be set via the degree of uniform diversification, especially at high speeds · The so-called Sohneilspinneη thermoplastic materials, such · B _e polyamides and polyesters, the yarn tension has an essential function to achieve stable winding as a measure of the resistance.

The process can also be used in the manufacture of glass fibers and in solution spinning.

When working according to the invention, the spinning security is significantly improved. At high speeds it is compliance with the method according to the invention is essential Basic requirement for the stability of the process · This does not mean that the inventive Process at normal spinning speeds application finds, since the security and continuity as well as adjustability of the process are also given. Farther the threads produced have a relatively high strength, as can be seen from Example 2, because each capillary of the common thread bundle is subject to the same stress »It is also essential that with a given Spinning path length a sufficiently large adjustment of the resistance is made possible, with a variety of Combination options has · Essential additional facilities for setting are not necessary because Usual technical devices only have to be modified (e.g. nozzle geometry).

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The invention is to be explained in more detail using exemplary embodiments. In the accompanying drawing show:

Fi fii , 11 a nozzle plate with a circular arrangement of the bores with the same distance between the bores,

2: a nozzle plate with two hole circles with a possible embodiment according to claim 7,

Fig. 3: a nozzle plate having fläehenförmiger arrangement of the nozzle holes according to claim 8,

Fife. 4: a nozzle plate with a cellular arrangement of the nozzle bores according to claim 8.

In Figures 1-4 are possible embodiments of Spinnerets shown. The number 1 denotes the nozzle plate and number 2 denotes the nozzle bore. From Figure 2 it can be seen that the outer and inner pitch circle diameter are almost the same and offset the holes are arranged, Fig. 3 shows a planar arrangement of the nozzle bores, the distance within the area is the same and there are a larger number of holes at the edge (corresponds to a smaller distance of the holes one below the other at the edge) »Fig. 4 shows a cellular arrangement on the edge of the Lines there is twice the number of holes with a defined spacing

Examples:

1. Polyfile PA-6 filaments with a fineness of 0.67 tex per capillary Figure _# 1 were prepared under the same spinning conditions and wound up at 4000 m / min on a conventional spinning device having a nozzle in accordance with.

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The hole spacing of the capillaries and the resulting thread tensions are listed below and demonstrate the influence of the level of the same resistance

Looh arrangement

Hole spacing

Thread tension

circle
circle

11.5 mm
23.0 mm

2.3 p / tex 3.8 p / tex

2, The influence of the same resistance should continue are represented by the following example · Polyfile PA-6 thread with a capillary titer of 0.27 tex were ai ^ f a common spinning device manufactured and wound:

Arrangement of the holes

Ascent speed

strength
the threads

2 rows with constant hole spacing, without the one according to the invention Way of working

3000 m / min

4000 m / min

29 p / tex

cannot be wound up

continual capillary ruptures of the marginal capillaries

Rice shape with constant hole spacing according to FIG. 1

3000 m / min

4000 m / min

38 p / tex

flawlessly wound up

The variant with constant hole spacing without Edge reinforcement in the 2 rows does not correspond to the method according to the invention, the strength is opposite the method according to the invention relatively low

3 · The influence of the leakage of the capillaries should shown in the following example:

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Polyfil PA-6 threads were wound up under constant spinning conditions at 4000 m / rain. The Eapillary titer was 0.21 tex _e

Fanning thread path of the total thread

Streoke closed the way voltage

(Distance between the thread bundle (up to

DUse control measuring point)

element)

1.2 m 4 m 5.2 m 3 p / tex

5.2 m - 5.2 m 9 p / tex

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Claims (1)

Patent claims: A method for the secure spinning of polyfilament threads with relatively high strength, preferably from thermoplastic masses, especially at high speeds, characterized in that the individual capillaries of the thread bundle to be produced are passed through one or more fluid and / or gaseous media after leaving the spinneret Generate an equal resistance against each of the individual capillaries, the same resistance being achieved by a flow-technically adapted hole arrangement with a circular shape and constant hole spacing or according to the hole arrangements of the nozzle bores according to claims 7 and 8. 2, method NaOH to claim 1, characterized in that _f the capillaries of the fiber bundle of resting, fixed parts or walls at a distance of 1 cm = managed · 3 * method naoh claim 1 to 2, characterized _? that air, water vapor, inert gases with different temperatures are used as media 4 »Method according to claims 1 to 3» characterized in that the level of the same resistance is set by premature merging of the capillaries with pneumatic or other known twist generators or thread locking devices · 5. The method NaOH to claims 1 to 4, characterized in that the height _T of the same resistor is set in a duroh direction of the yarn path in the variable-length pit and a correspondingly adjustable guide member with or without preparation system, 6098 19/106 7 - 10 - ^"10 - 25398A0 6 · NaOH method claims 1 to 5> gekennzeioh- by net y that the height of the same resistance duroh the choice of the hole spacing of the nozzle bores is adjusted. 7. Device for performing the method according to claim 1 to 6, characterized duroh a spinneret, in which the arrangement of the holes takes place in two rings, the ratio of the Durohmessers des outer ring to the Durohmesser of the inner ring is about 1, the holes between the rings preferably are offset, between and on the rings adjacent holes have a distance of »2.5 mm and the diameter of the inner ring = 15 mm 8. Apparatus for performing the method naoh claim 1 to 6, characterized by a spinneret with any planar and / or row-shaped arrangement of the bores, in which the number of bores on the edge of the bore arrangement or at the end of the in-line bore holes compared to the number of bores within the area or row is larger «. - For this 1 sheet of drawing - 60 9819/1067