DE1660150A1 - Method and device for drawing synthetic threads or bundles of threads - Google Patents

Description

DR. ELISABETH JUNG. DR. VOLKER VOSSIÜSV DIPL.TnO '. GERHARD COLDEWEY

MÖNCHEN 23 ■ CLEMENSSTFLASSE 30 ■ TELEPHONE 345087 · TELEQRAM ADDRESS: INVENT / MONCHEN ■ TELEX 5-2 »βββ

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Pos ~ 7338 Asahi

ASAHI KASEI KOGYO KABÜSHIKI KAISHA
Osaka, Japan

Method and apparatus for stretching synthetic Threads or bundles of threads

Priority: No. 51834/64, September 9, 1964, Japan

The invention relates to a method and a device for Drawing of synthetic threads or thread bundles », in particular a method and a device for periodic Varying the titer of the threads or thread bundles.

Synthetic threads or bundles of threads, e.g. B. from polyamides, polyesters, polyolefins or polyacrylonitrile, are industrially produced by wet spinning, dry spinning or melt spinning. In the spinning process, the spinning liquid consisting of a polymer is pressed through the spinneret and solidified into threads. The spun threads are still not oriented enough and must then be stretched to a value suitable for practical use in order to orient the micelles. - / % ι a * ?, a no. ι sm? a ^ * ** & * »» && * - * 4. s. ι «;?

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BATH ORIGINAL

Stretching is generally carried out between two or more old orphans running at different speeds.

Known methods for periodically varying the titer of syn ~ These threads or bundles of threads are:

1) Process in which the supply of spinning liquid la the Spinneret is varied (U.S. Patent 2,821,742);

2) processes by which irregular solidification of the thread, ^ Immediately after this comes out of the spinneret, is achieved

will (British Patent 931,380);

3) Method of changing the stretching ratio in which the feed roller or the drawing roller is driven eccentrically during the pre-drawing in a Streokzwlro-Masohine (Japanese Patent Publication Sho 36-2018 and 2019);

4) Processes in which the speed of rotation of the drafting roller is varied periodically (USA patent 2 810 939)

™ All of the processes mentioned require complex, »very precise and therefore very expensive systems.

The invention now relates to a new method and a new device for drawing synthetic threads or Thread bundles! * For the production of threads or thread bundles with periodic titre fluctuations «! *, Which do not» work so precisely » de, make complicated and expensive equipment necessary.

The invention also relates to a method and © ils ©

2Q981S / U75

: -. BATH ORIGINAL

Device for the production of threads or bundles of threads of uneven titre, which are dyed and processed into fabrics have a strange appearance.

Ee has been found to be effective in drawing synthetic threads of polyamides, polyesters, polyolefins or polyacrylonitrile by means of a stretching roller, the surface of which is divided into two zones or areas which extend axially, the Larger zone, e.g. by wet grinding with aluminum oxide content Abrasive powder ground and the smaller zone polished to a high gloss is, the drawing takes place unevenly and the yarn denier fluctuates periodically.

Accordingly, the invention relates to a method for drawing synthetic threads or thread bundles, which is characterized in that the thread denier varies periodically is made by drawing the thread using a combination of a stretching roller, the surface of which is divided into two zones or areas that extend axially, a larger one ground and a smaller one highly polished and a second roller, the surface of which is ground.

In the method according to the invention, the periodically fluctuating yarn denier can be achieved by only slight modification of the conventionally used stretching devices, so that the device according to the invention is not expensive. It is characterized by a feed roller, a stretch rod and a Stretching roller, the surface of which in a polished and. a highly polished area is divided, as well as by a separate roller

20981S / U7S

BADORiOINAL

with a completely polished surface,

When dyeing the stretched threads or bundles of threads according to the invention the less extended parts of the threads become deeper colored than the more intricate ones, ao that when woven of the threads, the Gettebö obtained shows a nrogclia-like coloration and therefore has a particularly peculiar appearance «

The invention is explained in more detail below with reference to the accompanying drawings. .

Fig. 1 shows a perspective view of an embodiment of the device according to the invention,

Fig. 2 shows a further embodiment in perspective the original device,

3 and h are diagrams in which the titre fluctuations obtained according to Example 1 are shown in the case of threads which have been drawn according to the method according to the invention or the conventional method using conventional drawing rollers,

Figs. 6 and 6 are similar graphs showing the results obtained in Example 2.

The ordinate of the graphs obtained with a tester is in Reality a cor.vaxe line, the ordinate in Fig. 3, 4, 5 and However, 6 is changed to a straight line.

In Fig. 1, (1) denotes the coming from the take-up reel,

20981S / U76

BATH ORIGINAL

Undrawn thread, or the thread bundle that runs over a feed roller (2) and a conveyor roller (3), then over a Stretching rod (4) is tucked and from there over a stretching godet, consisting of a combination of a stretching roller (5) and a separated orphan (6), runs and eventually on one Ring twisting machine is wound into a bobbin.

180 ° to 330 ° of the Obsrilächenusofang the stretching roller (5) were sanded, for example by means of wet sanding with eluainiumoxydhaltigern abrasive powder _f and the remaining surface © highly polished (in Fig. 1 and 2, the dotted roller surfaces are sanded) * In this way, the running thread, if sr is passed over the highly polished part of the surface of the stretching roller (5), because of the high frictional resistance to the thread, normally stretched without slippage, while the thread is only insufficiently pre-stretched when it is passed over the sanded part of the roller surface because the frictional resistance is there low 1st.

The roughness of the sanded and dee mirror polished Part of the roller surface is determined by the desired frictional resistance. The highly polished part of the roll surface should have a roughness of less than 0.5 S, so that a sufficiently high frictional resistance is guaranteed, and the roughness of the ground part of the roll surface

• ought to be at least 1 S, but not more than 12 S, so that8 a suitable thread slip is ensured, but no thread breakage occurs due to excessive roughness. The above in

209816 / U7S

The roughness given in S units corresponds to the height, expressed in Hicron units (μ) , of the raised parts of the roll surface relative to its recessed parts.

In this way, threads or thread bundles can be periodically added Fluctuating titer produced when the drawing roller (5) rotates. The frequency of the titer fluctuations can be at will changed by changing the Durdtuaessera of the drafting roller (5) be while the amplitude? the titre fluctuations arbitrarily can be increased by reducing the windings of the threads or thread bundles on the drawing godet (5 and 6). On the other hand, the amplitude of the titre fluctuations »i.e. the length the insufficiently stretched thread sectiona, are enlarged, by increasing the ground area on the surface of the drafting roller (5) · The amplitude of the titre fluctuations but can also be enlarged by the fact that, as in Flg. 2, two separate rollers (6) are used and the contact surface of the running thread on the surface of the drawing roller (5) is reduced.

Similar results can be obtained who to either a fixed ground Metalletift or metal pins whose surface Z was naßgeschliffen ₀ B. with aluminiurnoxydhaltigea abrasive powder, or one or more fixed porcelain pins whose surface was greatly roughened, in place of the separate roll (6) in Flg . 1 or instead of one or two separate rollers (6) in FIG. 2.

209818 / U76

BATH ORIGINAL

The following examples illustrate the invention. example 1

An undrawn thread of polycaprolaotam with a titer ▼ on 60 den. was with the in Flg. 1 device shown. 2A0 ° of the circumference of the surface of the stretching roller (5) were roughened by wet grinding with abrasive powder containing aluminum oxide and subsequent chrome plating brought by 3 S; the rest of the fold surface was polished to a high gloss (roughness 0.3 S). The diameter of the drafting roller (5) was 100 am and the length of the thread ends between the stretching rod (4) and the first transfer point on the stretching roller (5) was 70 mm. The thread was looped once around the drawing godet (9 and 6) and then on one Ring twisting machine wound up. FIG. 3 shows in a diagram the fluctuations in the titre of the thread obtained in this way, while FIG. 4 In comparison, la diagram shows the titre swings of the same thread, which by drawing by means of a conventional 'The stretching roll was achieved »d. H. a stretching roller · their entire surface is highly polished (roughness 0.3 S). The results shown in the diagrams were obtained using a Titer testing device (Uster) determined. The titer test was like carried out as follows: the thread was passed through a 2-flattened condenser at constant speed, whereby the the fluctuations in titer caused volume fluctuations of the thread passing through were converted into current surges and recorded. In the coordinate system, the abscissa corresponds to The longitudinal direction of the thread and the ordinate shows the amplitude

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BATH ORIGINAL

the titer fluctuations in %, based on the thread titer of 0 %. It can be seen from FIG. 4 that the thread titer remains essentially constant in the case of buckets of thread drawn in accordance with the conventional method. On the other hand, FIG. 3 shows that the diagram for the stretched face of the invention has low points, ie that the thread has insufficiently stretched sections at intervals of 29 μm in the longitudinal direction Thread sections with a finer titer 5 »3 x 10, those of the thread sections with a coarser titer 1.7 x 10, which indicates insufficient stretching.

The threads obtained in this way were woven and dyed, with discoloration irregularities occurring in the fabric obtained, which gave it an appearance gave an interesting look.

Example 2

24-ply Polycaprolactao yarn old with a total of 245 denier. was pre-stretched by means of the device shown in FIG used stretch roller who the same -as the In Boiepiel 1. You * The running yarn touched about 1/3 of the surface of the draw roller. It was wound three times around the godet, consisting of a combination of a draw roller and two separate cores.

The periodic fluctuation of the titre of the threads thus obtained is in Flg. 9 shown. Vie Flg. 6 shows, have the same threads, dia were stretched by means of the herlcötamtlicben stretching roller, none Age fluctuations on.

Claims

209816/1475

BATH

Claims (1)

Claims 1, a method for drawing synthetic FMd «n or thread bundles, characterized in that the thread tare is varied periodically by drawing the thread by means of a combination of a drawing roller, the surface of which is divided into two zones or areas which extend axially , a larger ground and a smaller high gloss polished as well as a second Vfalzö ₀ whose surface is ground, 2 "Method according to claim 1, characterized in that the frequency of the titer fluctuations of the thread or thread bundle is changed at will by varying the diameter of the drawing roller. 3. The method according to claim 1, characterized in that that the amplitude represents the gate fluctuation of the Thread or thread bundle is arbitrarily enlarged by changing the number of windings around a godet consisting of one Combination of the draw roll and the separate roll, reduced. 4 ο method according to claim l _r characterized in that the amplitude of the titre fluctuations of the thread, d. h "the length of the insufficiently incorrect thread sections is increased by" increasing the polished area on the surface of the Strock roller 209B16 / U75 . 4. «ι ίο * -» · ORIGINAL Method according to claim I _9, characterized in that the amplitude of the titer fluctuations of the thread or thread bundle is increased by using a godet consisting of a combination of two separate rollers and a stretching roller, the contact surface of the running thread or thread bundle on the drafting roll surface reduced _o 6, device for drawing synthetic threads or bundles of threads with periodic titre fluctuations »characterized by a feed roll (3)» a draw bar (4), a draw roll (5), the surface of which is divided into two zones or areas which extend axially »one larger ground and a smaller high-gloss polished one where the larger zone is 180 ° to 330 ° of the surface circumference of the stretching roller (5) ₉ and a separate roller (6) with a completely polished surface. 209816 / U75 bad ORIGINAL " Blank page