DE2406177A1 - PROCEDURE FOR CUTTING CONTINUOUS FEDES - Google Patents

Description

Method of cutting continuous threads

For the production of textile articles made of plastics or synthetic materials, these materials can be used either as Use single fibers or as continuous "multi-ended fibers as well as fiber yarns. These fibers can be used in fixed Lengths obtained by breaking or cutting continuous fibers which are crimped or non-crimped could be. This is generally done by means of rotating cutting tools, which are formed from disks, on their Edge knives are attached.

However, it can be seen that the speeds achieved with these methods and devices are limited, wherein the supply of the fibers to be cut does not consistently exceed 300 m / min. In addition, in between Disturbances occur which are known under the designation "cut adhesions" (- "soudure de coupe") and which are caused thereby The individual fibers will stick together because of the heating that follows the cut.

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In -US-PS 3 530 751 a method is also described that serves to cut a cable or rope from continuous fibers in the form of a compressed strand. This Compressed strand is obtained in a device in which the cable or rope zigzags in parallel folds on itself is laid with the filaments remaining parallel to each other. Here you get fibers, polygamy either in pieces of the same kind Length or cut into pieces of different lengths. The last-mentioned possibility arises when you consider the number of the cutting elements or the lateral position of a single cutting element changes so that the fibers of different lengths occur in the form of fiber packets, each packet containing fibers of the same length. A diagram of the cut lengths of these Fibers therefore show a stepped course. Since the fibers are then to be used for yarn manufacture, proves this turns out to be disadvantageous. If you want to carry out spinning like the Baumwo11spinneret, you use fibers, which are cut into pieces of equal length. Should, however, spinning in the system of a woolen or worsted spinning mill are made, fibers with different cutting lengths are used, which can go for full lengths from 35 to 350 mm. Even Artificial fibers and synthetic fibers are used in such a way that their cut length diagram is comparable to that of wool. this happens to make work easier in the spinning machines and to achieve a uniform yarn.

Recently, it has been proposed to cut the continuous fibers by means of a laser. The ones to be cut up Fibers generally form a rectangular array in Form of crimped or non-crimped ropes passing through Spinning or extruding synthetic or plastic materials.

The present invention relates to a method that enables to cut the thread at a high feed speed, and to glue the cut surface report. 409833/0836

The invention relates to a method for cutting continuous threads which are in a form which is referred to as "strand" in the following description. A strand is understood to mean an arrangement or presentation of at least one thread in a curvilinear, flexible and compact form, as obtained by means of a fluid which introduces the thread or threads into an enclosed space, folds or collapses ₅ and accumulates it therein lets progress. The fluid can be inert or non-inert with respect to the material. This fiber bundle-like strand consists of pad-like thread accumulations _s individually from each other, the dissolved fibers and are irregular ^ _o DOH tangled fibrous, curled. This type of crimp takes place by compressing the fibers in a tube due to the effect of the fluid. In this tangled fiber strand, which can take up the entire volume of the tube, the individual fibers are not necessarily folded or bent in one plane and parallel to one another - ie in a zigzag shape.

The apparatus generally used for the formation of such a strand includes means for generating a flow of a pressurized fluid in a tubular space which defines a restricted elongate, preferably cylindrical region. The fluid serves to introduce the thread or threads at one end into this space, in order to cause an upset and accumulation of the thread or threads, as well as irken a progression of the strand thus formed to the other end to bex \ ^T. The device can also contain devices which serve to laterally suck off the fluid completely or partially. The device may also contain devices for introducing foreign substances, such as dyes and various auxiliary substances.

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Such devices for generating the said strands are for example in PR-PS 1 289 491, FR-PS 1 491 449, the FR-PS 2 052 16l and FR-PS 2 109 421 described.

The present invention relates to a method of cutting the continuous multifilament threads made of plastic or Synthetic materials to carry out. This procedure is characterized in that the cutting of at least one continuous multifilar filament is carried out when this is in the form of a flexible strand, which is dissolved from pillow-like accumulations and caused individually by fluid Upsetting in a tube of tangled crimped multifilaments is obtained, and that the formation of said strand is obtained continues continuously.

The strand can be realized with the help of a thread or several threads made of plastic or synthetic materials, which may or may not have a twist. You can also cut a strand made from natural fibers, the Has fibers of identical and / or different colors, as well as fibers that are crimped or not. The diameter of the strand does not matter. The cutting direction can be parallel or transverse to the strand. According to the setting of the cutting tools, either a total cut or a partial cut of the strand is obtained. In the case of an overall cut the diagram of cut lengths is similar to that of wool.

The method according to the invention makes it possible to cut feed threads, which, prior to the formation of the said strand, have speeds which can be higher than 300 m / min and up to can range to values of J000 m / min and above. The procedure in particular enables a cut to be made with continuous thread production.

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Ira general has so far been after "a spinning or extruding the thread combined with other threads, so that a cable or rope was formed, which is then cut or broken became. However, this process is discontinuous, and it was not previously possible with the known process to perform continuous cutting. With the method proposed in the present application, in which the Device for producing the strand and for cutting are inserted into the thread production chain, can be continuously receive a cut up product. This results in savings in manual labor as well as mechanical Facilities. The thread feed of the device for forming the strand can obviously also be discontinuous be carried out when the thread of mountings, such as x ^ eise Bobbins or spinning pots, comes from here Thread feed preferably continuously. Indeed, it proves to be advantageous if the thread is fed in at high speed in the known compression device for the production of the strand from this exits at a slower rate, which is generally of the order of magnitude from 5 to 150 m / min, and when the thread is cut at this time. One can do this for that Cutting at the same time the high feed speed as well as taking advantage of the strand formation and the reduced feed rate of the strand in the device as well as of its output.

The operation of the method of the invention by way of example but not limited apparent from the 'following description, ^{r-to-understand} drawing. Show in it:

FIG. 1 shows a perspective view of a device for carrying out the method according to the invention;

Figure 2 is a side view, partially in section, of one. alternative embodiment of the device and

Figure 3 is a side view, partially in section, of one further embodiment of this device.

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FIG. 1 shows how a strand 1 emerges from a tube 2 from a device (not shown) for producing the strand. The strand 1 is gripped between two guide rollers 3 and k , which are adjustable with regard to their spacing. A cutting device, such as a blade 5 *, is inserted between the two guide rollers, the depth of cut being adjustable. ..is. The blade 5 is arranged in the interior of the strand 1. It is attached to a lever 6, which can be adjusted in a guide groove 7 so that the blade can be moved closer to the strand or further away from either. The strand is completely or partially cut in contact with the blade according to the depth of the cutting edge. In the event of complete cutting, the fibers can be collected in a container, pneumatically brought to a storage location or press, or to a shredder which separates and tears them apart, the shredder possibly

a production facility for sheet or carpet-like material or devices for the production of

Can supply yarns made of fibers continuously. -

If, on the other hand, only a partial cutting takes place, the cut strand can either be in one Containers are received, for example in a basket, or wound up v / ground. Instead of the fixed blade you can use a rotating disc with a cutting edge. In this case, the rotating disk could go through at the same time pass through a device for sharpening the same. In the When using knives in the classic form, the knives often have to be removed for the purpose of sharpening. With a automatic sharpening or grinding of the wheel 5 it becomes possible to operate continuously without this disadvantage. Instead of keeping the strand in constant contact with the cutting element hold, it is also possible, if so desired, to intermittently engage the cutting element with the strand

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permit. This intermittent intervention can be done through it achieve that one pushes the cutting element forwards and backwards or that it is given a special profile. Instead of one Arrangement of the cutting tools between the guide rollers, you can also use them Ia a slot, which in the tube is attached to the rope formation device, as this is the Example of Figure 2 shows. You can also attach the cutting tools outside of the guide rollers and outside of this tube, for example, as shown in FIG. The guide rollers between which the strand passes are either both driven, or only one is driven individual of these * they can also be replaced by two conveyor belts - depending on the arrangement of the cutting tools it is possibly also possible to attach several cutting tools. After cutting the strand, this can be done in the case of a complete cutting ^ product obtained continuously a yarn from the fibers are processed, which is done by means of such devices, as for example in Spiders with free ends can be used. The most common Method of making yarns from the fibers is to progressively align, stretch, and parallel the fibers to twist to get a yarn. This goal is achieved having performed a large number of 'conversion operations' on expensive' equipment and numerous manual Work is done.

In the newest tent one saw the emergence of spinning processes, some with few Run intermediate stages and make it possible to insert a flat or carpet-like material or a sliver directly into a yarn convict. These procedures are commonly called "op en-end" spinning or labeled "spinning with free." Ends "known where mechanical, hydraulic, electrostatic and pneumatic devices are used. There would therefore be an interest in a yarn-like product Fibers obtained by using a device such as

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240617?

it is used in a spinning mill with free ends, subsequently arranged on the cutting device according to the invention.

In the case of a partial cut, the product obtained is either twisted directly and continuously, or it is collected first and then twisted. Finally, a yarn-like product twisted from fibers is obtained. The obtained, made of fibers Twisted thread has cut and not cut individual fibers, which is what makes it one in comparison to yarns made from fibers gives greater tensile strength.

The partially cut strand can be subjected to a refinement by stretching and winding under torsion, so that it becomes possible, starting from a thread with a larger thread count, to arrive at products with relatively small thread counts.

It is also possible to obtain artificial yarns by changing the depth of the cut made in the strand appropriately programmed, These yarns in the form of fiber yarns can be used for production of wovens, fabrics, knitted and knitted goods are used, as well as for the production of non-woven or non-woven, Random fiber fleece-like materials and are used in the entire textile sector.

The following examples serve to further illustrate the invention. However, they should not be understood as a limitation.

example 1

A thread of polyhexamethylene-adipamide with 250 dtex / 1 ^ 6 threads with a cross section having four protruding areas and coming from a spinning-drawing device was fed continuously at a speed of 1100 m / min into a device as shown in FIG

the FR-PS 2 109 ^ 21 is described. The diameter of the tube and thus also the strand produced was 10 mm.

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The strand passed between two guide _{rollers, which rotated at a speed of 12 5} 5 m / min - and then came into contact with a rotating knife - as shown for example in Figure 3 * which at a speed of 25 revolutions / Min circulated <, the knife penetrated about M- mm deep into the strand and cut it into fibers with lengths between 60 and 100 mm _o

Example 2

A viscose thread with 530 dtex / 120 threads, which came from a bobbin, was introduced at a speed of 400 m / min in a gate direction, such as

it is described in FR-PS 2 052 Ιβΐ _o The diameter of the tube and thus the strand produced was 4 mmο

In the tube, the strand came into contact with a rotating knife, which rotated at a speed of 25 revolutions / min ran around and penetrated the strand 2 mm deep »The strand then ran between two guide rollers, which move with the rotated at a speed of 9 * 80 m / min. The fibers which After opening the cord, lengths between 20 and 35 mm.

Example J

Two threads of polyterephthalate from ethylene glycol with 107 dtex / ^ 0 Fa = den without rotation were continuous at a speed of 800 m / mi.i. introduced into a device as described in the FR-PS 2 052 161 is described. The diameter of the tube and thus also the strand was 4 mm.

The strand obtained ran between two guide rollers, which circulated at 18.90 m / min. Then it was cut up as follows:

a) with a penetration depth of I ₅ 5 ram by means of a fixed blade or by means of a rotary knife, which rotated at a speed of 25 revolutions / min. One received

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Fibers with lengths between 50 and βθ ram;

b) with a penetration depth of the cut of 2.5 mm. One received using the means described above, fibers of lengths ranging between 15 and 20 mm.

Example 4

A thread made of polyhexamethylene adipamide with 2300 dtex / 1 ^ 6 threads, with a cross-section that had four protruding areas and that came from a spin-draw device became continuous into a device at a speed of 1100 m / min

• introduced how

it is described in FR-PS 2 109 421 »The diameter of the tube and thus of the strand was -10 mm,

The strand was passed between rotating guide rollers, Walked around polygamy at a speed of 12.5 m / min, vio he came into contact with a fixed blade, which was arranged parallel to its axis. The depth of penetration the blade was about 2 mm. The partially cut The strand was then wound up in the form of a spool at a speed of 930 m / min and also with a twist twisted at 40 revolutions / m to produce a product in the manner of a yarn made of fibers for the manufacture of carpets.

The invention thus provides a method for cutting at least one continuous thread made of a plastic or Synthetic textile material created in which the cutting takes place when the thread is in strand form.

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Claims (4)

Patent entitlement 1 1.) A method for cutting continuous multi-filament threads from a plastic or synthetic material, characterized in that the cutting is carried out at least 'one continuous multifilament thread, if this is in the form of a flexible strand which is made up of layers of multifilaments is formed that are detached and individually in a completely irregular manner. Compression and accumulation in a tube are curled under the action of a fluid, and that the strand formation is continued. 2. The method according to claim!, Characterized in that one makes an overall cut through the strand in order to obtain fibers with different cut lengths, polygamy Have a cut length diagram similar to Violle's. J. The method according to claim 1, characterized in that introduces a partial cut in the strand. 4. Use of the through a partial cut according to claim 3 cut strand to be twisted into a product of the type of a yarn made of fibers. 409833/0836 Read more