DE2355884A1 - METHOD FOR PRODUCING A FIBER BAND MADE FROM FIBERS OF LARGE PILE LENGTH - Google Patents

Description

- "" ^ Patent attorneys ** · »..
Wp !. Inn. F. Weickmann, Λ ■ -. ·· - -. ^ '. "a 1000 '3RD

Dipl. Ing. H. Weickmann, Dfpl.Phys. Dr. K. Fincke

Dip !. Ing.F. A. Weickmann, Dipl. Clieni. B. Hubar

8 Munich 27, Möhistr. 22nd

0-M LO ¹ D., Urn da Bleis. , 7 TJmeda, Kita-tai Osalca-shi, Osatca, Japan

ASAHI KA.S-RI KOCtYO KABUSHIICI KAISHA, 25, Dojimahamad.ori 1-chome, Kita-Toi, Osaka-sbi, Osalca, Japan

Process for the production of a larger from fibers. Stack length. hes.tehe.the JTas.erbandes

The present invention relates to a method of manufacture a sliver made of fibers of great staple length for spinning purposes.

For convenience of explanation, the fiber whose length is longer than 3 inches is hereinafter referred to as long fiber designated.

For years the gilling process has been the usual process which in worsted manufacturing plants for combing and stretching from long fibers such as from.

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Wool fibers, existing slivers or tops are used will. Since the excellent development of synthetic fibers, several effective methods of manufacture are available of slivers made of long synthetic fibers directly from a tow. The machines used for these processes are hereinafter referred to as "converters".

Well-known converters are the "Pacific Converter" (trade name of the converter manufactured by Warner & Swasey Co., USA), the "Turbo Stapler" (trade name of the converter manufactured by Turbo Machine Co., USA) and the ¹¹ OM Tow Reactor "(trade name of the converter manufactured by OM Ltd., Japan). These converters have contributed to the introduction of several new spinning processes known as the so-called shortened processes for producing a continuous sliver Sliver the material used to finely spin worsted yarn.

In the latest abbreviated processes, at least one gilling process and one draw roll device with a Apron stretching device, used in combination. the The type of combination depends on the functions that the machine components have to perform. However it is It is important to recognize that at least one gilling operation is performed in each of the newest methods mentioned above will.

The reason for this is the fact that the output speed one in the needle bar section (gill box)

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has upper limit value, so that the gilling process as An obstacle to increasing the productivity of the device used for the production of the sliver can be.

Lately there has been a steady increase in Labor costs in spinning mills can be determined. One Method to compensate for these higher labor costs and .'the increased production " costs consists in the increase of the output speed and through this the increase in the productivity of the Machinery,

The main aim of the present invention is to provide a new process for producing a continuous! To create sliver of long fibers, which increases the productivity of the spinning process in considerable ¹ . Mass increased.

This procedure uses a long fiber Sliver stretched under controlled conditions so that the sliver is split into a bundle of individual fibers which have the potential to be independent of each other in the subsequent Streek method to move. (The above-mentioned stretching operation is hereinafter referred to as a separating operation because of its separating function This controlled stretching takes place in a central section of a section delimited by two long aprons Stretching field. The sliver produced in the mentioned stretching operation is then a subsequent one Subjected to stretching operation, in which the stretching process under controlled conditions with the help of a three-

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dimensional stretch control device is performed. While the fibers are passed through this stretch control device, the relative movement of the individual Fibers of the fiber bundle controlled with respect to one another so that the fibers do not move as a group can. While the fibers are individually stretched three-dimensionally as they pass through the stretch control device the individual fibers are mixed as evenly as possible. So it shows from this . Sliver dispensed in the stretching field an even distribution of the individual fibers. To achieve the aforementioned combined stretching action through the first and the second stretching operation were repeated attempts to determine a relative relationship of the sliver thicknesses in the first and second stretching operations carried out.

The above-mentioned method, which acts two successive due to different stretch control principles Combining stretching operations was carried out in the applicant's spinning mill in attempts to produce a purely synthetic one Sliver and a mixed sliver in which synthetic fibers are mixed with wool fibers have been used successfully. Furthermore, it has been shown that the aforementioned method for the production a sliver made of pure wool. It has also been found that when producing a top grade If it is desired, the aforementioned three-dimensional stretching operation is preferably carried out twice target. If, on the other hand, very coarse yarns, such as carpet yarns, are to be produced, it is sufficient to use the three-dimensional

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Perform a sional stretching operation once.

Further features and advantages can be found in the following description of exemplary embodiments with reference visible on the drawings. In the drawing show:

Fig. IA and IB sketches to illustrate the fiber

control during a stretching process with a strap stretching device;

Fig. 2 is a schematic side view of a ver

improved apron stretchers used in the present invention arrives;

Figures 3A and 3B are photographs, "one showing the fiber arrangement in a fleece shows that of a conventional two-belt drafting system originates, while the other shows the fiber arrangement in a fleece, which is from the is derived from the improved device shown in Figure 2;

4A and 4B are sketches to illustrate the fiber control during a stretching process. with a so-called three-dimensional ^r * stretching device ;. . ■ -

Figure 5A is a perspective view of one embodiment a three-dimensional one used in the present invention Stretching device;

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FIG. 5B is a schematic side view of the FIG

Fig. 5A shows the three-dimensional stretching device;

Fig. 5C is a schematic front view of the essential part of Figs. 5A and 5B shown three-dimensional stretching device;

Figures 6A, 6B,

6C, 6D sections through the structure of each other

mixed fibers in different processing phases.

Experience has shown that a sliver that is produced directly from a tow by means of a converter is a specific one Group of individual fibers glued together. Consequently, it is an abbreviated procedure for Creation of a continuous sliver by means of a converter is essential, which are glued together Separate fibers from one another in order to form a bundle of separated individual fibers, and then close them evenly Mix. The company Warner & Swasey has a process for the production of a continuous sliver from long Fibers introduced for the purpose of producing worsted yarns. In this process, a machine is used to tear loose and Mixing as the first step in producing a continuous, consisting of separate individual fibers Sliver used, with a high degree of parallelism is guaranteed. These to tear loose and Mixing machine has a stretching field, which

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a first stretching zone and a subsequent (or second) Has stretching zone. ■

This is followed by three consecutive Gill processes carried out. The aforementioned latest Warner & Swasey method is published in the Knitting Times (National Knitted Outer-wear Association, USA) of May 8, 19 72 on pages 21 and 22. It should be noted that- the three required gill processes with the help of a roller stretching frame called DUO-DRAFTER more difficult Construction after the Reiss ^ - and mixing process can be carried out. To produce a continuous one consisting of parallel, separate, individual fibers Sliver and for a sufficient mixture of the fibers should therefore be the three successive Gill processes may be necessary because the separation and mixing achieved by the DUO-DRAFTER is inadequate. With others In other words, by using the aforementioned roller stretching frame, it is not possible to work together to separate glued fibers of the sliver, a bundle of separated individual fibers and to mix them sufficiently. Since with this In addition, three needle bar draw frames (also known as high-speed pin drafters) are used, it is clear that there is a certain upper limit of the The productivity of the process is determined by the maximum output speed of the needle bar is.

In the Schlumberger process (disclosed in the company's catalog) is tearing away and mixing with the help

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two Gill processes carried out, the sliver produced by the second needle bar length from the The aforementioned stretching device is stretched, the latter being an upper controlled stretching caterpillar and a lower Has straps. However, this third stretching device does not have sufficient ability to wrap the rear. End region of a subsequent sliver with the front end region of a preceding sliver combine when a new sliver is fed. In addition, it has been proven that productivity this stretching device is not high enough to solve the problem of production cost.

The "slip" stretching process developed by Ingolstadt AG, Germany, for the production of fiber ribbons designated method uses a plurality of balloon rollers instead of the third stretching device ' by Schlumberger. This new process is described in detail in the catalog of the company mentioned. However, it is necessary the balloon rollers of this third stretching device according to the thickness of the fed sliver and to change the stretching ratio. In addition, the life of these balloon rollers is not very long.

As already mentioned, the known processes for the production of fiber ribbons are capable of the higher proportion of labor costs not to be compensated in the production costs.

In the present process, the gilling process step not used because of its upper production limit. Basically, in the present procedure

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during the first of a series of drawing process steps, i.e. during the separation and blending of the individual Fibers sufficiently separated from the neighboring fibers and at the same time the correct shear effect guaranteed between the front ends of the adjacent fibers. Furthermore, the individual fibers of the stretched sliver are arranged in such a way that the highest possible Parallelism between the fibers is achieved.

This is then done during the breakaway and the Mixing produced sliver subjected to subsequent drawing to produce a thinner sliver; included a further mixing of the individual fibers takes place, and these are further stretched straight.

Experience has shown that a so-called roller stretching device offers direction is the best means of performing the first step in the sliver manufacturing process, provided that the stretching control of the floating fiber in the stretching field is sufficiently guaranteed. Furthermore is known that the two-belt stretch control device is a suitable device for controlling the movement of the floating fibers. In the present proceedings however, fibers are used which have a very large staple length, which is greater than 7.6 cm.

Since the two-belt stretch control device "^ only rarely is used as a stretch control device for a sliver with long fibers, this had to be applied to the present one Procedure to be adjusted.

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Referring now to Figures 1A and IB, a stretch control device will now be described described, which has an upper part and a lower part.

The upper part has a first rear roller la, a second rear roller 2a, a tensioning roller 3a, an endless apron 5a guided over said rollers la, 2a and 3a and a guide roller 4a for tensioning the apron 5a. The lower part, however, has a first rear roller Ib, a second rear roller 2b, a tension roller 3b, an endless apron 5b and. a guide roller 4b for tensioning the apron 5b. As is known, it is assumed that the contact pressure P between the aprons 5a and 5b varies according to the solid curve 11 in FIG. 1A. The pressure P is therefore very large in the nip 9 between the rollers Ia and Ib and is considerably lower along the line connecting the terminal point with the 9 between the rollers 3a ^- 3b connects located and nip 10th The pressure P assumes its lowest value in the middle region of the stretching field between the clamping points 9 and 10 and increases in the direction of the clamping points 9 and 10, as is shown by the solid curve 11 in FIG. 1A. As a result, in the stretching process with the aid of the two-belt stretch control device in the central area of the stretching zone, no effective prevention of the movement of the fibers in the grouped state can be achieved, since the pressure P has such a low value that the free movement of the individual fibers cannot be influenced . This disadvantage of the two-strap

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The stretch control device is very obvious when the distance between the clamping points 9 and 10 is quite large is. As is known, the distance between the clamping points 9 and 10 should be set so that this is about the Staple length of the fibers corresponds. The movement of the individual fibers of the sliver in the direction of point 10 is controlled by the particular pressure of the straps 5a and 5b, which results from their elastic properties. This movement is also influenced by the speed of the aprons. The aforementioned disadvantage becomes explained in more detail below. As can be seen from FIG. 1A, the pressure in the middle region of the distance between points ~ 9 and 10 has a very low value. In this area can be a certain number individual fibers, which are released from a nip formed by a front pair of rollers (not shown) are moved together with neighboring fibers that are gripped by said pair of rollers, in such a way that they move with the conveying speed of said rollers. These free fibers can also are moved together with the adjacent fibers detected by the rollers la and Ib, in such a way that they move with move the conveyor speed of these rollers. The aforementioned free fibers are called floating fibers, although they are arranged between the straps 5a and 5b. The fibers captured by the pair of rollers are hereinafter referred to as "front fibers", whereas the fibers captured by the rollers 1a and Ib are referred to as "rear fibers" Fibers ".

The aforementioned movements of the floating groups of fibers

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are more pronounced when the distance between the points and 10 is larger because the pressure P in the central area of the aprons 5a and 5b is lower as the distance between points 9 and 10 is larger. However, according to the principle of the two-belt stretch control device it can be expected that the fiber components of the sliver will separate from one another as a result of the pulling action of the pair of rollers can be conveyed separately into the stretching field, provided that the pressure is in the middle area the apron is such that it prevents the aforementioned movement of the floating groups of fibers.

As is known, the pressure P in the central region of the stretching field can be increased by various means. One of these methods consists in the use of a tensioning member 6 arranged inside the lower endless apron 5b in order to urge the lower apron 5b upwards, as shown in FIG. 1B. In Fig. IB the tensioning element 6 is shown by a dashed line . When the tensioning element 6 is arranged as shown in FIG the lower strap 5b. This path is indicated in FIG. 1B by a dot-dash line.

In the aforementioned state in which the clamping member 6 the The contact surface between the upper apron 5a and the lower apron 5b shifts upwards, the between them grows the pressure occurring on the aprons 5a and 5b, as shown by the dashed line 12 in Fig. 1A. For better Explanation will be the size of the upward

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Shift of the contact surface hereinafter referred to by "χ". In this state, the contact pressure prevents the free movement of the floating fibers. In other words, it reaches the leading end of each individual fiber the gap of the roller pair and can be of one in the apron stretching field located fiber bundle can be withdrawn individually. As a result, they have individual Fibers a potential ability to move independently of other fibers in the subsequent stretching process, because they are separated from the neighboring fibers, which could have been glued together before this stretching process have been.

To confirm the * above-mentioned observation, tests were carried out, for which one was used as a two-belt stretching device according to the Fig. 2 trained stretching device was used. With this two-strap stretching device is limited by the lower strap 5b. Space a clamping member 6 is removably arranged, such as this is shown in FIG. The data for this stretching device are given in Table 1 below.

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Table 1

Through the appropriate
Reference number designated
roller Diameter in mm Wire gap between
two clamping points in mm 120 roller 38 Pinch point
(Roller / roller) ' 180 la 38 (la) / (Ib) - (13) / (14) Ib 38 160 2a 38 36 2 B 15.5 (13) / (14) - (14) / (15) 3a 15.5 ■ 150 3b 25th 4a 25th (la) /. (lb) - (16) / (17) 4b 25th 13th 70 14th 50 (16) / (17) -. (18) / (19) 15th 70 16 50 17th 70 (la) / (Ib) - (3a) / (3b) 18th 50 19th 50 20th 55 22nd 23

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* Length of the clamping member (6) 64 now

* Upward displacement of the contact area between

the upper strap and the ■ -.

lower strap (x) 4 mm

* Material of the straps (5a) (5b) synthetic rubber

* Width and thickness of the straps 280 mm χ 2 mm

* Conveyor speed, m / min. 300

A continuous sliver of acrylic fibers was produced with the aid of a 0-M tow reactor. The "focus on that Data relating to sliver were as follows: thickness of each fiber, 5 denier; Average length 10.1 cm (4 inches); Thickness of the sliver 26 g / meter. Eight ribbons of fiber were doubled to blend and then were fed to the aforesaid stretching device, the stretching ratio being 16.0. It became a sliver made of a thickness of 13.0 g / meter. To confirm the effect of the tensioning member 6, the aforementioned were Observation experiments carried out as follows. the Doubled fiber ribbons 24 were fed to the stretching device shown in FIG. The doubled slivers were one between two pairs of rollers 18, 19 and 16, 17 performed separating stretching and then fed to the main stretching field, which a two-belt stretch control device and a front roller mechanism with two lower rollers 13, 15 and one upper roller 14 exhibited. The sliver was mainly stretched in this main stretching field and at the nipping point between the

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Rollers 14 and 15 dispensed a continuous fleece 25.

In practice, the fleece 25 would be compacted by a compactor and only then by calender rolls 22 and 23 are issued. During the experiment, however, the compressor 2.1 was removed, so that the fleece 25 directly through the Gap between the calender rolls 22 and 23 was issued. The fleece has been carefully put on a see-through Glass plate laid. From FIGS. 3A and 3B it can be seen that when the tensioning member 6 is omitted, the through the front Rolls 14 and 15 dispensed web had multiple groups of individual fibers, hereinafter referred to as "bead" whereas when using the tensioning member 6, the fleece is made up of evenly arranged individual fibers duration.

With the help of the aforementioned experiment it was confirmed that the separation of the fibers of a sliver produced with the aid of a compactor using a double apron stretch control device can be performed satisfactorily, provided that the correct contact pressure is generated between the upper apron and the lower apron.

It follows that mixing and stretching evenly of the individual fibers of the supplied sliver must be achieved in the subsequent process. It should be noted that in order to achieve the main object of the present invention, high productivity in this subsequent process as well must be achieved. Because of this, the gilling process cannot be started due to its limited productivity.

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be turned. In addition, it is important that a continuous fine sliver of fiber is used in the subsequent process uniform thickness is generated, which is no too Has knobs leading interweaving of the fibers. It was found that the so-called three-dimensional Stretch control is suitable for the present process provided that the individual fibers of the Sliver are arranged in the aforementioned desired manner. As for the arrangement of the fibers in the sliver, As far as the subsequent process is concerned, it was confirmed that the aforementioned two-belt stretch control device can be used advantageously. As a result, only the three-dimensional ones remained Stretch control to determine significant conditions.

M. Hannah reports in the Journal of the "textile Institute (No. 41, page 57, 1950) about her work with three-dimensional stretch control. ■ Your theory is supported however, on the resulting stretching behavior of individual fibers when feeding a twisted material to a one three-dimensional stretch control device having stretching field. In the present case, however, the stretch control must be considered for another case in which untwisted individual fibers are fed to the drawing zone will.

As explained earlier, there is the one with the three-dimensional Stretch control device equipped, subsequent stretching device supplied sliver from individual Fibers that can be moved independently of the other fibers. As a result, the only one left with three

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dimensional stretch control parameters still to be determined the way in which the movement of the hovering Fibers in the stretching field should be controlled and the way in which the individual fibers are to be grounded during the stretching process should be mixed.

As is known, it would be desirable to change the conveying speed of the floating fibers from the speed of the rear fiber to the speed of the front fiber just at the moment when the front end of the floating fiber reaches a position adjacent to the gap formed by the front rollers. It is also important that the leading end of the individual fiber be guided parallel to the stretching path in a straightened state. If the arrangement of the front ends of the individual fibers is uniform in the longitudinal direction and the aforementioned change in speed of the individual fibers is achieved in the aforementioned state, the relative number of the front fibers with respect to the rear fibers varies along the stretching field according to FIG. AA. In Fig. 4A, the number of individual fibers in the nip of the three-dimensional stretch control device is denoted by "N", while the number of front fibers and the number of rear fibers are denoted by Nf and TT ^, respectively. When the draw ratio is denoted by D, the number of fibers in a sliver discharged from the front rollers can be represented by N / D. The most important elements of the three-dimensional stretch control device are shown in FIG. 4B. The front rollers are denoted by the reference numerals 26, 27, and the three-dimensional stretch control device has a lower,

QRiGlMÄL iwö

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grooved roller 28 and one grooved on the roller 28 engaging pressure roller 29.

With this three-dimensional stretch control, on the one hand there is the distance between the front rollers 26, 27 and the nip formed by the grooved roller 28 and the pressure roller 29, on the other hand, the pressure exerted on the individual fibers by the between the grooves of the roller 28 and the pressure roller 29 formed space passing through fleece · exercised becomes, very important factors. In other words: if the mentioned distance is too small, the individual fibers experience a conveying effect, simultaneously from the front rollers and from the three-dimensional stretch control device, so that there is a possibility of a fiber tear. If, on the other hand, the distance is too great, a certain amount is experienced Number of individual fibers no conveying effect at all, so that these fibers move as floating fibers and cause uneven stretching. There were therefore Tests carried out and it was found that said distance should preferably be set so that it is shorter than the maximum stack length should be. When the distance is set in this way and a corresponding pressure on the pressure roller 29 ■ is exercised, the fibers of a fleece passed through the aforementioned space are controlled so that its conveying speed is equal to the output speed of the three-dimensional control device. As soon the front end of a single fiber reaches the gap between the front rollers 26, 27, the conveying speed changes this fiber from the output speed

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speed of the three-dimensional stretch control device to that of the front rollers 26, 27. Accordingly such fibers are made up of a bundle of individual fibers, which with the output speed of the three-dimensional Stretch control device is promoted, pulled out. As a result, there becomes a stationary stretch control effect exercised by the three-dimensional stretch control device, so that a smooth stretching process can be achieved. When the applied to the fiber bundle in the three-dimensional stretch control device If the pressure is too great, the aforementioned pulling out of the individual fibers from the fiber bundle results in fiber breakage. If, on the other hand, the aforementioned pressure is too small, a certain number of individual fibers could come through the three-dimensional stretch control device moving fiber bundles therethrough together with the withdrawn fibers be moved. As a result, both pressure and distance must be used in these three-dimensional stretch control methods be predetermined. According to the tests carried out, the size of the grooved roller and the pressure roller 29 of a limited space of the number of fiber bundles passed through said space contained fibers can be adjusted.

When the fiber bundle the aforementioned space as roughly three-dimensional Structure is fed and the individual fibers as soon as their front ends through the through the front Rollers 26, 27 are detected gap formed, withdrawn at the speed of the front rollers 26, 27 is the sequence of changes in the conveying speed of the fibers from the relative position of the

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front ends of the three-dimensional stretch control device influenced individual fibers dependent. The aforementioned change in the conveying speed of the fibers results in an advantageous mixing condition, for example a so-called "sandwich mix".

The above-mentioned mixing method is explained in detail below. Assume that three are made up of individual fibers ίχ a first type of existing sliver and three consisting of individual fibers f2 of a second type of the drawing and stretching strips shown in FIGS. 5A and 5B Mixing device are supplied. The sliver group fed to the downstream end of the sliver guide 37 S] _ becomes in a parallel, band-shaped state as shown in Fig. 6A. After passing through the fiber band guide 37, this fiber band group has the shape of a bundle S2 with a oval cross-section, as can be seen from FIG. 6B. DiB relative positions of the individual slivers the group S ^ in the bundle S2 may change from time to time change. -

When the bundle S2 is fed into the space between the grooved roller 28 and the pressure roller 29, the relative position of each individual fiber f] _ ·, f2 can be estimated as shown in Fig. 6C. In this figure, the bundle of fibers f] _,. f ₂ denoted by S3. As FIG. 6C clearly shows, the relative positions of the individual fibers f 1, f 2 form a so-called "sandwich" arrangement. As a result, the time at which the front

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End of each individual fiber of the sliver bundle S2 from the gap formed by the front rollers 26, 27 is detected, not only by the relative position in The longitudinal direction of the front ends of the individual fibers of the supplied fiber ribbon bundle S · ^ influences, rather also by the aforementioned "sandwich" arrangement. As a result, the desired mixing of the individual Fibers are obtained in the sliver bundle S4 discharged from the front rollers, as shown in Fig. 6D is. If, however, the combined sliver bundle Si is stretched, while the individual slivers their Maintaining the relative positions shown in Fig. 6A, is the point in time at which the leading end of each individual fiber of the combined sliver from the nipping point, formed by the front rollers 26, 27 is detected, mainly the result of the relative positions in the longitudinal direction of the front ends of the individual fibers of the supplied fiber ribbon bundle Si the aforementioned relative positions of the individual fibers of the supplied fiber ribbon bundle would be maintained, otherwise It is impossible to mix the individual fibers according to the desired arrangement shown in FIG. 6D. Besides that The aforementioned mixing method can provide sufficient control of the floating fibers, as mentioned, then hoped if the material of the sliver is prepared so that it meets the condition according to which the individual fiber components have the potential to be individually in the subsequent stretching process to move and are arranged in a uniform and straightened state.

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The experience has been that when the material of the sliver has a certain variation in its thickness, this by using an automatic Control device or can be corrected by repeated duplicating or stretching steps. As a result, will in the present case an automatic control device for correcting the irregularity of the sliver thickness in the aforementioned separation and mixing process and / or in three-dimensional stretch control method is used. the Figs. 5A and 5B show the essential parts of the three-dimensional stretch control device. In Figs. 5A and 5B, the three-dimensional stretch control device is a stretching device having a pair of front rollers 26, 27 and a pair of rear rollers 30, 31; also a sensor of an automatic control device, which is pivotably mounted on a shaft 33 fixedly arranged on a machine frame (not shown) Angle lever 32, a rotatably mounted on a shaft 34a carried by the free end of the angle lever 32 Pressure roller 34 and a grooved roller 35 fixedly mounted on a shaft 35a, the latter is driven according to the feed speed of a sliver bundle S ^. The pressure roller 3-4 engages in one Groove in the roller 35 with a spring acting on the angle lever. 36 constant pressure exerted. One funnel-shaped sliver guide 37 is in one of the engagement point of the pressure roller 34 with the grooved Roller 35 upstream position is arranged in such a way, that even if a plurality of fiber ribbons are doubled and the Dublierte'n slivers Si fed to the stretching device are brought into the shape of a bundle, the sliver S] _

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that is a size adapted to the space between the grooved roller 35 and the pressure roller 34 - The three-dimensional stretch control device, which also includes roller 28 and pressure roller 29, is arranged in the stretching field of the aforementioned stretching device. For the purpose of achieving the three-dimensional Stretch control, the grooved roller 28 is necessarily driven so that the peripheral speed of the bottom of the groove of the roller 28 is the same as the output speed of the rear rollers 30, 31. In In practice, however, it is preferable to use the so-called separating distances in the zone between "the clamping point of the rear Rollers 30, 31 "and the" nip point between the grooved roller 28 and the pressure roller 29 ". The pressure roller 29 is provided with the grooved shaft 28a via a gear train (28d, 40, 41, 42 and 29d) Roller 28 driven. The grooved roller 28 sits on the shaft 28a, in turn in two Roller bearing 28c is mounted. The pressure roller sits on the shaft 29a, which is mounted in roller bearings 29b, the in turn are arranged opposite the bearings 28c. The dimensions of these bearings and rollers are chosen in such a way that that when the pressure roller 29 is engaged with the "grooved roller 28, that between the grooved one Roller 28 and the pressure roller 29 existing space between the roller bearings 29b and 28c existing Distance corresponds. In addition, a spacer gauge 29c is inserted between the roller bearings 29b and 28c. These Teaching 29c can be replaced by another teaching of a different thickness depending on the desired spinning conditions.

OL INSPECTED

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When the roller bearings 29b by a conventional roller pressing mechanism loaded v / ground, the minimum gap Q between the grooved roller 28 and the pressure roller 29 · are adjusted because both roller bearings 29b and 28c are under the action of the pressing mechanism rest on the gauge 29c. When a bunch of single Fibers is passed through said space Q, the cohesion of the neighboring fibers of the bundle can be high Achieve value because the large volume of the bundle is pressed into space Q and is much smaller in the process is, as in the free state of the bundle. Therefore, in three-dimensional stretch control, it is very important to the space Q and the cross-sectional area of the through this to match the continuous fleece to each other. In practice, the minimum distance between the roller bearings will be 28c and 29b by inserting gauges 29c “different Thickness adjusted. The setting up of the three-dimensional stretch control device must be carried out when setting the distance between the gap of the rear rollers 30, 31 and that of the front rollers 26, 27 of the stack length of the Fibers are carefully adjusted. When the sliver S ^ is fed, its cross-sectional shape is changed and thereafter, the sliver is formed in the between the pressure roller 34 and the grooved roller 35 Introduced space. The shaft 34a is moved in accordance with the changes in the thickness of the sliver. This creates movement a pivoting movement of the angle lever 32 around the shaft 33. In this way, the variation in the sliver thickness is measured, the movement of the lever "32" being a Servomechanism (not shown) of an automatic control device (not shown) is transmitted.

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As is known, several automatic control devices for correcting the sliver thickness have already been proposed been. These devices can be used in the present case. The output of the control device controls the delivery speed of the front rollers 26, 27 and through these the draw ratio, see above that the unevenness of the sliver thickness can be corrected. In the aforementioned device individual fibers of a fleece S2 discharged by the rear rollers 30, 31 are fed into a through the with Grooved roller 28 and the pressure roller 29 formed space is introduced. When the front end of each one Fiber reaches the nipping point of the front rollers 26, 27, the conveying speed of this individual Fiber changed to the speed of the front rollers 26, 27, i.e. this single fiber moves now as the front fiber. As a result, this front fiber is made up of a bundle of rear fibers at through the three-dimensional one Extension control device exerted control pulled out. ■.

The preferred stretch control and mixing of the individual Fibers is therefore advantageously embodied as described with reference to FIGS. 5A and 5B.

A useful relationship between the fiber density of that passed through the three-dimensional stretch control device Fleece and the space Q was determined through experiments. Let the aforementioned fiber density with M in (g / Meter) / mm ^. Then M can be from the equation:

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W.
M = KH X

D ' ^Λ I ₁ XI ₂

are calculated γ where:

W is the weight of the sliver fed in in g / meter,

D the stretching ratio in the stretching field between the by the pressure roller 34 and the grooved roller 35 and the gap formed by the Pressure roller 29 and the grooved roller 28 formed gap,

. 1-, the width of the groove of the roller 28, 12 means the height of the space Q.

For example, if W = 85/6 g / meter, D = 1.36, Il = 30 mm and I ₂ - = 6 * 5 mm, then:

^{M = (} -Ί73Γ- ^{> X} Wx 6.5 ^} = 0.32 3 (g / m) / mm2,

In practical tests it was found that the most beneficial Range of M is around the value 0.3 (g / m) / mrn ^. At this time, the load on the pressure roller 29 corresponded to one Value of 140 kg. This load can depend on the material of the fiber, the thickness of the fleece and the

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material used for its lubrication can be varied in the range from 80 to 200 kg. It has been found that three-dimensional stretch control is practically applicable in spinning when the thickness of the web passing through the three-dimensional stretch control device is in a range between 28.5 g / m and 114 g / m. This area corresponds to the following number of acrylic fibers: 85'500 to 342 denier at 3 ¹ OOO fibers and 51,200 denier to 205,000 at 5 fibers.

Table 2 below shows the test results determined in connection with the present invention.

Table 2

Trial number ¹
1
- - 2 3 4th 5 Output speed
in m / min. 510 Il It Il !
Il Supplied material:
Acrylic fiber 3d It Il Il U Average
Stack length 90mm Il Il Il Il
S. Weight of the fiber
band in g / m 15.2 Il If If Il Number of, Dublie
struggles 5 5 5 5 I.
5 three-dimensional
Stretching device
Diameter: in mm front
I. lower: 70 front
upper: 60
I.

409629/0270

ORIGINAL INSPECTED

Table 2 (continued)

I.
I trial number 1 2 3 4 5 . Mute roller;
(Slot 30,;
Outside diameter 58) _; Print roller: 60 '■ second second
lower: 36 upper: 40 third third;
lower: 36 upper: 40 Measuring device
grooved roller i
(Slot 32,
Outside diameter 60) \ Print roller: 70
j Roller caliper in mm - 'i
front: 125 I.
front - three-dimensional
Stretch control device: 50 j second - third '139 i
third - measuring device 186 ' Stretch ratio
entire stretching "7 · 7 Il I 'H II front - second 5.704 '. second - third 1.115 ·. third - «measuring device. 1,208

409829/0 27

Table 2 (continued)

Trial number 1 2 3 4th 5 Load pressure in kg front stretching field 90x2 Il M. Il t
Il three-dimensional
Streckfeld 70x2 ■ 1 Il Il Il second stretching field 50x2 third stretching field 20x2 Measuring device 60 three-dimensional stretch
control device in mm ¹ I. 30th Il Il Il Il ! 2 6th 5 -4 3 2 ü% of the issued company
serbandes 1.4 ■ 1.4 1.3 ψ. 1.6

In this example the third rolls were in a zone upstream of the main draw field used.

The above results of those carried out in the spinning mill Tests confirm that with the help of the three-dimensional stretch control method, the stretch control with greater Effectiveness can be done.

409829/0270

ORIGINAL INSPECTED

Table 3 shows an example of an experiment carried out in practice / in which the combined method consisting of the separation method and the three-dimensional stretching method according to the invention is used will. In this Verstach fiber ribbons made of ordinary acrylic fibers (5d χ 110 mm) and fiber ribbons were made steam-fixed acrylic fibers (5d χ 110 mm) mixed in a separation and mixing process »

Table 3

:
;
-
: - Separating and
Mixed
machine 1 ^R χ 1 ^C Stretching and mixing
machine mif 3-di-
dimensional stretch
control device - 13th (second) fed
Sliver in
g / m - regular steam
... fixed
■ (first) 8th LH χ lC • number of
Duplicating
gene. 18 24 1 ^H χ l ^c 9 Issued
Sliver in
g / m 4 4 9 13th 8th 9

409829/0270

Table 3 (continued)

Note: (1)

(2)

Separating and
Mixed
machine Stretching and mixing
machine with 3-di-
dimensional streek
control device I.
1
i
ι (first) (second)'
I. 1 ^H χ l ^c 1 ^H χ l ^c L ^H χ IC regular steam
fixed I.
ί Expense
fast
speed in m /
min. 300 450 450 Streckver
ratio 13.0 1.1.6 8.0 Effect
degree in% 85 85 85 production
in kg / pc. 202 206 206 U% of he
witnessed Fa
serbandes 2.0 1.8 1.6

H denotes the number of heads. C denotes the number of coils per head.

When the aforementioned combined method of feeding a spinning device with

4-0 9829/0270

2355384

50 ¹ OOO spindles is used to produce 1520 kg / hour, eight sets of the above combined apparatus are required.

(3) In this experiment, the following process includes pre-spinning and fine spinning.

The above table confirms the fact that the combined Method according to the present invention from the standpoint of product grade and high Productivity of the machines from working in an excellent way. Thus the invention offers very useful features Abbreviated processes for use in the so-called worsted spinning process.

4-0-9 8 2 9./02

Claims (5)

A η. s p. r ü c. H. e 1 / Process for the production of a continuous sliver, consisting of a large number of individual long fibers, characterized in that a combination a separation and mixing process is carried out, whereby a plurality of supplied fiber ribbons are doubled and stretched, that at least one subsequent Process for stretching fiber bundles and for mixing the individual fibers with one another carried out will; that in said first method a fleece of individual fibers by means of one with two straps provided stretch control device is stretched, the stretching process with positive contact pressure between the two straps is controlled in such a way that any individual fibers stuck together separate and that the sliver dispensed by said stretching device consists of individual fibers, which have the potential ability to stand out from neighboring Move fibers independently; that in each subsequent procedure a plurality of the aforementioned first Process produced fiber ribbons are doubled and fed as a bundle to a drawing field; that a bunch individual fibers is fed to a cubic stretch control zone, which in the said stretching field under the action a predetermined pressure is formed, such that the conveying speed of said individual Fibers moving in the direction of said stretching field at a predetermined feed speed, 409829/0270 is changed to a predetermined output speed of said stretching field, as soon as a front The end of each individual fiber reaches the front end of the stretching field, with an even Stretching and · even mixing of the individual fibers can be achieved. 2. The method according to claim 1, characterized in that that one or more of the mentioned methods with the help of an automatic stretch control device is or will be carried out. 3. The method of claim 1, characterized in that said post-process under conditions is carried out, the density of the fibers of said bundle, which is defined by the cubic The stretch control zone is between 0.25 g / m / mrn ^ and 0.6 g / m / m / mi2. 4. The method according to claim 1, characterized in that that the subsequent process is carried out under conditions, wherein the fiber bundle through the cubic stretch control zone under the action of a predetermined pressure, which is between 60 kg and 170 kg, is passed through. 409829/0270 5. The method according to claim 1, characterized in that that the first procedure is carried out at an output speed greater than 250 meters / min is, whereas the subsequent process at an output speed that is greater than 400 meters / min, is carried out. 409829/0270 Le e rs.e i t e