JPH0157170B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for fabricating hollow fiber bundles of spaced apart hollow fibers extending substantially linearly from endless hollow fibers.

Hollow fiber bundles of this type are necessary for producing devices with thermal energy transfer or mass transfer through the hollow fiber walls, possibly acting as diaphragms. In that case, it is also possible to manufacture the hollow fiber bundle that produces the transmission in the form of a hollow fiber exchange unit. In this way, similar to known filter cartridges, the hollow fiber replacement unit can be quickly and easily replaced with a new or refurbished hollow fiber replacement unit in the event of wear, dirt, damage, etc. The above-mentioned devices are increasingly used in the technical, medical and other fields, and depending on the nature of the hollow fibers, heat transfer, pure mass exchange, pure material separation or a combination thereof is carried out. .

In order to produce the transmission device or hollow fiber replacement unit already described, the ends of the hollow fiber bundle are embedded in a hardening injection material and after the injection substance has hardened, the openings in the hollow fibers are opened again to remove the hollow fibers. Some of the injectate is removed until fluid can flow freely through the fibers.

A hollow fiber bundle of this kind and a transmission device made therefrom are known, for example, from US Pat. No. 3,228,456. However, the same specification does not disclose a method for manufacturing the hollow fiber bundle disclosed in the same specification.

A method for producing hollow fiber bundles is known from US Pat. No. 3,391,041 and US Pat. No. 3,755,034. In a known method disclosed in U.S. Pat. No. 3,391,041, endless hollow fibers are wound around a core in a helical pattern, and then the individual hollow fibers are fixed with adhesive tape to prevent slipping. The hollow fiber wrap is then cut along its generatrix, after which the hollow fiber bundles are spread out flat, and subsequently the spread hollow fiber bundles are arranged at irregular mutual spacings and of uniform length. The fibers are wound into a hollow fiber bundle consisting of hollow fibers extending substantially straight and parallel to each other. The hollow fiber bundle disclosed therein has a circular cross section. In the method described in the above-mentioned U.S. Pat. A hollow fiber roll of the shape is rolled up,
At least one edge of the band of hollow fibers is adhered with a hardened plastic, and then a portion of the hardened plastic is removed to open the hollow fiber openings. The hollow fiber bundle formed in this way has a circular cross section and the individual hollow fibers are located at uniform mutual spacing.

The production of hollow fiber bundles according to this known method is uneconomical, involves many working steps, and has disadvantages which will be disclosed later.

It is an object of the invention to quickly and simply produce a hollow fiber bundle consisting of hollow fibers arranged at mutual intervals and extending approximately linearly from endless hollow fibers in one working step, and to Hollow fiber exchange units can be fabricated with structural provisions for counter-current or parallel flow or cross-flow or cross-counterflow or cross-parallel flow, as well as hollow fiber bundles with arbitrary cross-sections. Furthermore, any arrangement and distribution of the hollow fibers within the fiber bundle is possible, and furthermore, hollow fibers of different sizes or properties can be combined into one hollow fiber bundle with any distribution and in any quantity ratio. It can be placed inside the
Another object of the present invention is to provide a method that can fully automatically produce a large number of hollow fiber bundles, as well as an apparatus for carrying out this method.

The main point of the method of the present invention that solves this problem is that in the method of manufacturing a hollow fiber bundle consisting of hollow fibers arranged at intervals from each other and extending substantially linearly from endless hollow fibers, the finished hollow fiber bundle is The same number of endless hollow fibers as the number of hollow fibers to be included is prepared, and one end of the hollow fibers is separately and simultaneously passed through a first tightening device belonging to the hollow fibers. The hollow fibers are guided into a thread guiding device arranged behind the attaching device, and then each hollow fiber is fixedly held at the same time by a first tightening device, and one end of the hollow fiber is passed through the same thread guiding device and separated. and at the same time, at least two
through the holes in one perforated plate and into a second clamping device arranged behind the holes in the same perforated plate, after which the hollow fibers are released from the first clamping device, and said one end of the hollow fibers is are separated from the perforated plate by a predetermined distance in the longitudinal direction of the hollow fibers by a common second tightening device, and the perforated plate is separated from the thread guide device by a distance shorter than the predetermined distance in different amounts. then the thread guiding device is returned to the starting position again, the hollow fibers are cut behind the same thread guiding device, the said one end of the hollow fibers is released from the second tightening device, and the hollow fiber bundle is removed from the working area of the device,
Thereafter, the task is to return the first or second tightening device to its starting position again.

The movement of the second clamping device and the perforated plate in the longitudinal direction of the hollow fibers can take place one after the other or simultaneously.

a first clamping device for passing the hollow fiber end through a hole in the thread guiding device and a perforated plate arranged behind it and into a second clamping device arranged behind the perforated plate; grip the hollow fiber by
The thread guide device, the perforated plate and the second clamping device can be moved simultaneously towards the first clamping device. However, without moving the yarn guide device, the perforated plate, and the second clamping device, the hollow fibers are not gripped by the first clamping device, and the hollow fibers are gripped by the first clamping device. This first tightening device may be moved towards the thread guide device. Furthermore, a plurality of the above-mentioned devices may be moved toward each other relative to each other simultaneously or one after the other for the above-mentioned purposes. If both possibilities mentioned below are used, at least one clamping device is used before the first tightening device for each hollow fiber.
Preferably, two auxiliary thread guide devices are provided.

Through the use of perforated plates, the hollow fibers are held at a distance from each other, and the shape of the perforated plates and the arrangement of the holes in the perforated plates also affect the cross-sectional shape of the hollow fiber bundle or the hollow fibers. The arrangement and distribution of the hollow fibers of the bundle is defined. In this way, hollow fiber bundles can be produced, for example having circular, triangular, square or other shapes, for example annular cross-sections. In this case, the concept of an annular cross-section includes not only an annular cross-section, but also an annular cross-section of, for example, an ellipse or an oblong, and a hollow fiber bundle cross-section also includes rounded corners of a triangle, square or polygon. It is also possible to form the cross section into an annular shape.
When producing an exchange device in which fluid flows transversely through the hollow fibers, it is effective to produce a hollow fiber bundle in which the thickness of the hollow fibers changes in the direction of flow. Such hollow fiber bundles can, for example, be endowed with a trapezoidal cross-section by correspondingly designed perforated plates according to the invention. In that case, the same number of hollow fibers are arranged in each hollow fiber plane such that the hollow fiber bundle has the greatest spacing at its wide base and the narrowest spacing at its narrow top surface, in short the greatest hollow fiber density. be done. Furthermore, it is also possible to fabricate a single layer of hollow fibers using a perforated plate having only one row of holes, and to fabricate an exchange device by stacking any number of hollow fibers one above the other. In this case, it is also possible to arrange the hollow fiber layers so that adjacent hollow fiber layers intersect each other at arbitrary angles without coming into contact with each other.
Therefore, perforated plates are generally left in the finished hollow fiber bundle. The perforated plate is inserted again before the production of another hollow fiber bundle.

The number of perforated plates used is the length of the hollow fiber bundle,
The choice is made in relation to the strength of the hollow fibers or the type of subsequent use of the hollow fiber bundle itself. In order to be able to pass fluid through the hollow fiber bundles, possibly in the longitudinal direction of the hollow fibers, perforated plates with holes that are large compared to the cross section of the hollow fibers may be used. .
For the same purpose, it is also possible not to pass hollow fibers through all the holes in the perforated plate. Furthermore, it is also possible to use perforated plates with different hole spacings to produce hollow fiber bundles in which the hollow fibers do not run parallel to each other. Such hollow fiber bundles have, for example, a pyramid shape or a truncated cone shape.

It is self-evident that the first threading of each hollow fiber into the hole of the perforated plate must first be carried out by hand at least as far as the thread guiding device arranged behind the first clamping device. However, this piercing operation must be repeated each time, since after consuming one unit of endless hollow fibers, for example one bobbin, it is impossible to connect the rear end of the expended unit with the front end of the next unit. must be done.

To carry out the method of the invention, endless hollow fibers of any package shape can be used, in short, hollow fibers wound in the shape of a bobbin or hollow fibers packaged in the form of loops. be able to.

For the fabrication of hollow fiber bundles based on the method of the invention, heat transfer, mass transfer, mass separation and mass exchange,
In short, all known hollow fibers suitable for example for permeation, reverse permeation, dialysis, blood washing and the like can be used. In that case, these hollow fibers may be produced based on dry spinning, wet spinning or extrusion. The cross-sectional shape of the hollow fibers used is arbitrary, and the size of the cross-section of the hollow fibers and the upper and lower corners of the wall thickness are also not limited. Hollow fibers with a circular cross-section can, for example, have an outer diameter of a few μm, or an outer diameter of 5 mm or more. The wall thickness of the hollow fibers may be, for example, 5 μm. For the production of hollow fiber bundles used for heat transfer, it is particularly advantageous to use hollow fibers with a thermal transmission in the range from 1500 to 4500 W/m ² K and above. In order to increase the heat transfer ability of this kind of hollow fiber bundle, materials with good thermal conductivity such as metal,
It is advantageous to use hollow fibers containing particles or powders such as graphite. The hollow fibers may optionally or additionally contain fillers, additives, stabilizers, soot, pigments and the like. The use of porous hollow fibers significantly expands the field of use of hollow fiber bundles produced thereby. When using the hollow fiber bundles produced according to the invention for blood washing or alcohol separation in drinkers, hollow fibers that have only a low permeability for molecules with a molecular weight of 100 or more are effective, for example. ,
In this case, it is advantageous if such hollow fibers have a very high selectivity and therefore a very sharp separation precision. Hollow fibers of this type can be produced, for example, by recovering cellulose from a cuprammonium cellulose solution.

The size of the hollow fiber bundle produced according to the invention, that is, its length and cross-sectional size, is not restricted in any way within the range of its usual dimensions.

For embedding the hollow fiber ends, common adhesives, curable injection substances, injection plastics, special cements, etc. can be used.

Due to the nature of the hollow fibers used in the hollow fiber bundles produced according to the invention, the hollow fiber bundles can be used for liquid or gaseous fluids for heat transfer or mass transfer.

The device according to the invention for carrying out the method according to the invention comprises at least one fiber for each hollow fiber to be processed.
at least one first clamping device, at least one thread guide device, one cutting device arranged behind this, at least two receiving devices for at least two perforated plates and at least one second clamping device The first clamping device and/or thread guide device, the receiving device for the perforated plate and the second clamping device are arranged so as to be movable back and forth in the longitudinal direction of the hollow fiber.

For the production of hollow fiber bundles with hollow fibers extending approximately parallel to each other, the already described device of the device according to the invention is arranged in a straight line, i.e. each hollow fiber in a straight line when the tightening device is not activated. It is arranged in such a way that it runs through the entire device without any necessary bending or deflection. The clamping devices or thread guiding devices are advantageously arranged on a common base plate, holder or similar device parts arranged for reciprocating movement in the directions already mentioned, but in separate groups. , may be arranged on a plurality of such device parts arranged one after the other. In that case, it is advantageous for space reasons to arrange each device as well as the perforated plate in a plane perpendicular to the longitudinal axis of the hollow fibers. If necessary, there is no problem in using a different arrangement. The movement of the clamping device, the thread guide device and the receiving device for the perforated plate can be effected by electrical, hydraulic or pneumatic drives.

The course of movement and function order of each device and the restriction of the movement distance of each device can be controlled manually, but when manufacturing a large quantity of hollow fiber bundles, all work steps must be carried out mechanically and fully automatically. It is best to carry out the The mechanical, electrical, measuring and control equipment necessary for this purpose, as well as the mechanical and electrical interlocking of these equipment, are common to those skilled in the art and will not be described here. .

As the yarn guide device, for example, a perforated plate, so-called yarn combs or reeds or yarn guide rings attached to rods arranged orthogonally to each other can be used.

Within the scope of the present invention, the concept of a hollow fiber spacing member, expressed as a perforated plate, includes a number of intersecting rods, meshes, plastic grids, etc., which have open holes. Through which the hollow fibers are guided.

Within the scope of the invention, the term tightening device includes such devices which provide sufficient resistance to the movement of the hollow fibers during tensile loading. Therefore, this concept includes, for example, lattice yarn controllers or other yarn deflectors that provide sufficient damping, and that also allow the hollow fiber to be clamped and fixed between two surfaces. , also includes devices that act by suction. This type of device works well if its adjustable damping force is within the tensile strength range of the hollow fibers. Therefore, such a tightening device can e.g.
It can also consist of three perforated plates arranged one after the other, such that the holes coincide as the hollow fibers run through them. In this case, in order to obtain a "tightening" effect on the hollow fibers, in other words a sufficient braking force to prevent the hollow fibers from penetrating the holes, in this type of device, for example, every other perforated plate is attached to a fixed hole. It can be moved by any desired distance parallel to the perforation, in other words perpendicular to the longitudinal axis of the hollow fibers, thereby deflecting the hollow fibers and providing resistance to their movement. The tightening device can be actuated mechanically, electrically, hydraulically or pneumatically.

It goes without saying that the number of clamping devices and thread guiding devices as well as the number of holes in the perforated plate are adapted to the number of hollow fibers that the finished hollow fiber bundle is to have. There is no limit to this number, as the method and apparatus of the present invention are suitable for processing several hollow fibers and at the same time processing thousands of hollow fibers to form one hollow fiber bundle. This is because it is also suitable for

In order to avoid bending of the hollow fibers during their passage through the devices already mentioned, a plurality of thread guide devices are provided between the first clamping device and the thread guide device, moving together with these devices. It is preferable that these thread guide devices are provided for each hollow fiber and arranged so that the same spacing is maintained with respect to each of the moving devices and the spacing between them can be varied.

Next, the present invention will be specifically explained with reference to the illustrated embodiments.

In FIGS. 1a, 1b and 1c, only one hollow fiber is shown to simplify the drawings. In reality, a large number of hollow fibers are used, and therefore the number of devices described below corresponds to the number of hollow fibers to be processed, and all these devices are illustrated in FIGS. 1a and 1c, either simultaneously or one after the other. Needless to say, it performs the same functions and movements as the human body. FIG. 1a shows the starting position of the method according to the invention. In this starting position, the endless hollow fiber 1 wound on the supply bobbin 8 passes through the first tightening device 2 and
Thread guide device 3 located behind the first tightening device
is supplied within. Behind the thread guide device 3, perforated plates 4a, 4b as well as a second clamping device 5 are likewise located in the starting position. Furthermore, as shown in FIG. 1a, the first tightening device 2 is not yet activated. Arrow 6a indicates thread guide device 3, perforated plate 4
a, 4b and the direction in which the second clamping device 5 moves in the next step of the method according to the invention. first,
In a working step not shown, the first tightening device 2 is actuated, whereby the first tightening device 2
holds the hollow fiber firmly so that it does not shift.
The thread guide device 3, the perforated plates 4a, 4b and the second clamping device 5 are then moved in the direction of the arrow 6a, ie towards the first clamping device 2, so that the hollow fiber 1 is Thread guide device 3, perforated plate 4
It passes through holes 7a and 7b of holes 7a and 4b and enters into the second tightening device 5. The completed state of this working step is illustrated in FIG. 1b.

As shown in FIG. 1b, the first tightening device 2 is still in operation, the thread guide device 3, the perforated plate 4a,
4b and the second clamping device 5 are moved towards the first clamping device, so that the end of the hollow fiber 1 is located within the action range of the second clamping device 5. ing.

In the next working step, not shown, the second clamping device 5 is actuated and the first clamping device is released, whereby the first clamping device releases the hollow fibers. Second tightening device 5, perforated plates 4a, 4b
and thread guide device 3 are each moved a predetermined distance in the longitudinal direction of the hollow fiber in the direction of the arrow 6b, ie in the direction away from the first clamping device 2, so that after the end of this working step the first Occupy the position shown in the figure.

As shown in FIG. 1c, the thread guide device 3 has been returned to its starting position again, whereas the second clamping device 5 and the perforated plates 4a, 4b have reached their predetermined end position. The distance traveled by the second tightening device 5 from the state shown in FIG. 1b to the state shown in FIG. 1c is
Corresponds to the length of the finished hollow fiber bundle. This is because all the hollow fibers are cut by the cutting device 13 immediately after the thread guide device 3. Second, after the clamping device 5 has released the hollow fiber part again, the hollow fiber bundle is removed together with the perforated plates 4a, 4b and all devices are returned to their respective starting positions again. Before making the next hollow fiber bundle,
It is sufficient to simply install two new perforated plates 4a and 4b.

As can be easily seen from the description of FIGS. 1a to 1c, instead of moving the thread guide device 3, the perforated plates 4a, 4b and the second clamping device 5 from the starting position shown in FIG. 1a, The same result can be obtained even if the first tightening device 2 is moved toward the thread guide device 3 while holding the hollow fiber until the end of the hollow fiber reaches within the action range of the second tightening device 5. is obtained. Subsequent work steps are then carried out as previously described. Moreover, exactly the same result can be obtained if the previously described devices are moved simultaneously or one after the other by the required distances relative to each other and then the necessary work steps are carried out in the same manner.

FIG. 2 shows a rectangular perforated plate 4 in which holes 7 for hollow fibers (not shown) are arranged in vertical and horizontal rows parallel to each other. In this case, the spacing between each row is the same in the vertical and horizontal directions.

Figure 3 shows only one for hollow fibers (not shown).
A perforated plate 4 with rows of holes 7 is shown. in this case,
The intervals between the holes 7 are uniform.

FIG. 4 shows a trapezoidal perforated plate 4, in which the holes 7 are arranged in horizontal rows parallel to each other, with equal spacing between each horizontal row, and The same number of holes 7 are provided within each row. As a result, the distance between the holes in the respective upper row is greater than the distance between the holes in the lower row, and the distance between the holes in the lowermost row is the narrowest. A hollow fiber bundle consisting of hollow fibers passed through such a perforated plate will have a hollow fiber thickness that varies in the direction of flow if the direction of flow is perpendicular.

FIG. 5 shows a perforated plate 4 with holes 7 uniformly distributed along a circle of different sizes. The intervals between the circles are equal, and the intervals between the holes within each circle are different.

FIG. 6 shows two thread combs 9, 10 arranged orthogonally to each other. With this configuration, the mutual spacing between the hollow fibers (not shown) of the hollow fiber bundle is maintained in the same manner as in the embodiment of FIG. Furthermore, with this configuration the mutual spacing of the thread comb rods 11 can be adjusted to the diameter of the hollow fiber 1, and if a relatively large spacing is selected, the already described narrow or wide arrangement of the holes 7 in the perforated plate 4 It is possible to produce hollow fiber bundles of low density similar to those obtained by. It is clear that the hollow fiber bundle has a cross-sectional shape that corresponds to a perforated plate. In summary, the hollow fiber bundles held by the perforated plates or combs illustrated in FIGS. 2-4 and 6 not only have geometrically similar cross-sectional shapes, but also have uniform or It has a cross section filled with unevenly distributed hollow fibers. In contrast, the hollow fiber bundle produced by the perforated plate shown in FIG. 5 has an annular cross-section with a central flow channel 12 extending in the longitudinal direction of the hollow fibers.

FIG. 7 shows a rectangular perforated plate 4 with holes 7 uniformly arranged in horizontal and vertical rows. Through this hole, the first
The hollow fibers 1a of the group are arranged, and the hollow fibers 1b of the second group are arranged in the lower half. In this case, both groups of hollow fibers are divided according to their properties. Such an arrangement of hollow fibers is advantageously used, for example, to simultaneously and separately separate two fluids that are compatible with different diaphragms.
For this purpose, the hollow fiber bundle shown in FIG. 7 is flushed with fluid in a vertical direction. The different hollow fibers may not be divided into two groups, but may be evenly distributed over the entire cross section, in this way:
In each vertical row and in each horizontal row, there will be every other hollow fiber of the same nature. Since different hollow fibers are uniformly distributed in such a hollow fiber bundle, fluid can flow in both horizontal and vertical directions.

FIG. 8 shows a plan view of the hollow fiber bundle 1. The hollow fiber bundle can have, for example, a rectangular, square, circular or annular cross section. The mutual spacing of the hollow fibers is greater on one side and smaller on the other side. Such hollow fiber bundles have, for example, a truncated cone or pyramid shape and have hollow fibers of different lengths that are not parallel to one another. A structure of this type can be obtained by a perforated plate with holes at different spacings or, as shown in FIG. . The distance between the rods 11a of the thread combs 9a, 10a is smaller than the distance between the rods 11b of the thread combs 9b, 10b. In order to make it easier to thread the hollow fibers through the comb, it is possible to use a comb in which the spacing between the rods can be easily changed. This makes it possible to adjust the thread combs 9b and 10b to the same pitch as the thread combs 9a and 10a when passing the hollow fibers, and to readjust the pitch to the desired size later. Can be done.

The advantage of using a thread comb or reed over the use of perforated plates is that, if desired, the thread comb or reed can be removed and reused after the hollow fiber ends have been embedded. This is possible provided that the hollow fibers, especially the hollow fiber bundles, have sufficient strength to prevent bending when flowing a fluid transversely to the hollow fiber bundles. On the other hand, if the thread comb is to remain within the hollow fiber bundle, care must be taken to prevent the thread comb from undesirably slipping out of the hollow fiber bundle. Furthermore, it is easily understood that a cross-section of a hollow fiber bundle, such as that shown in FIG. 4, for example, can also be obtained by means of a suitably formed thread comb or reed.

FIG. 9 shows a tightening device consisting of three perforated plates 4a, 4b, 4c. The central perforated plate 4b is offset relative to the two perforated plates 4a, 4b, so that the hollow fibers (only one of which is shown) are deflected. This provides sufficient damping action against excessive transport movements of the hollow fibers when tension is applied.

In the perforated plate 4 illustrated in FIGS. 2 to 5 and 7, the flow direction of the fluid flowing around the hollow fibers has not been described, but for example for cross-counter flow or cross-parallel flow. , other configurations and arrangements than the illustrated perforated plate 4 are described, for example, in U.S. Pat.
3228456 can be selected. In a differently chosen flow direction, the perforated plate can be designed as a support plate, partition wall, etc.

[Brief explanation of drawings]

1a shows a schematic representation of the starting position of a working step of the method according to the invention; FIG. 1b shows a diagrammatic view of the situation after another working step; and FIG. 1c shows the situation after a further working step. Schematic drawings, FIG. 2 shows a perforated plate according to one embodiment of the invention, FIG. 3 shows a perforated plate according to another embodiment, and FIG. 4 shows a perforated plate according to a further embodiment. FIG. 5 is a diagram showing a perforated plate according to another embodiment; FIG. 6 is a diagram showing two thread combs arranged at an angle of 90 degrees to each other;
FIG. 7 is a diagram showing a perforated plate of yet another embodiment;
FIG. 8 is a plan view of a hollow fiber passed through a thread comb according to an embodiment of the present invention, and FIG. 9 is a sectional view of a tightening device according to an embodiment of the present invention. 1, 1a... Hollow fiber, 2... First tightening device, 3... Yarn guide device, 4, 4a, 4b, 4c...
...Perforated plate, 5...Second tightening device, 6a, 6b
...Arrow, 7, 7a, 7b... Hole, 9, 9a, 9
b, 10, 10a, 10b... Thread comb, 11, 11
a, 11b...rod, 12...flow passage, 13...
Cutting device.

Claims (1)

[Claims] 1. In a method for producing a hollow fiber bundle consisting of hollow fibers arranged at intervals from each other and extending substantially linearly from endless hollow fibers, the number of hollow fibers that the finished hollow fiber bundle should contain. The same number of endless hollow fibers are prepared, and one end of the hollow fibers is separately and simultaneously passed through a first tightening device belonging to the hollow fibers and placed behind the first tightening device. Then, each hollow fiber is fixedly gripped at the same time by a first clamping device, and one end of the hollow fiber is passed through the same thread guide device to separate and simultaneously separate the same threads. The hollow fibers are guided through the holes of at least two perforated plates arranged behind the guide device into a second clamping device arranged behind the holes of the same perforated plates, after which the hollow fibers are guided into the first clamping device. the one end of the hollow fiber is separated from the perforated plate by a predetermined distance in the longitudinal direction of the hollow fiber by a common second clamping device, and the perforated plate is separated from the perforated plate by a distance shorter than the predetermined distance. moving away from the thread guide by different amounts and then returning the thread guide to the starting position,
The hollow fibers are cut behind the same thread guiding device, said one end of the hollow fibers is released from the second clamping device, the hollow fiber bundle is removed from the range of action of the aforementioned devices, and then the first or second tightening device is removed. A method for producing hollow fiber bundles from endless hollow fibers, characterized in that the clamping device of No. 2 is returned to its starting position. 2. A method as claimed in claim 1, in which each hollow fiber is guided through an auxiliary yarn guiding device before guiding each hollow fiber through the first tightening device. 3. The hollow fiber end is clamped by a second clamping device by gripping the hollow fiber with a first clamping device and moving the first clamping device a predetermined distance toward the yarn guide device. The method according to claim 2, wherein the method is introduced into an apparatus. 4. In an apparatus for producing hollow fiber bundles of hollow fibers arranged at intervals from each other and extending substantially linearly from endless hollow fibers, at least one first clamping device for processing the hollow fibers; At least one thread guide device, a cutting device arranged behind the thread guide device, at least two receiving devices for at least two perforated plates and at least one second clamping device are provided. characterized in that the first clamping device and/or thread guide device, the receiving device for the perforated plate and the second clamping device are arranged so as to be movable back and forth in the longitudinal direction of the hollow fibers. A device that produces hollow fiber bundles from endless hollow fibers. 5. Device according to claim 4, characterized in that a stationary auxiliary yarn guide device is arranged before the first tightening device for each hollow fiber. 6. Claim 5, wherein a plurality of further thread guide devices are disposed between the first tightening device and the thread guide device and are capable of reciprocating motion while maintaining uniform spacing with respect to these devices. Apparatus described in section.