DE1817758A1 - Method and device for converting and aligning at least two strands of continuous fibers into staple fibers of uniform length - Google Patents

Description

DlPL-ING. GRÄMKOW DR. MDLLER-BORE 1817758

DlPL-PHYS. DR. MANITZ DIPL-CHEM. DR. DEUFEL DIPL-ING. DARK FOREST PATENT LAWYERS

- 5th MAY 197 &

B 1036 - Ho.

Burlington Industries Inc.

301, North Eugene Street, Greensboro, North Carolina, V.St.A.

Method and device for converting

and aligning at least two strands of continuous fibers into staple fibers uniform length

The invention relates to a method and a device for converting and aligning at least two strands of continuous fibers into staple fibers of uniform length. ■ |

The invention is particularly applicable to any new comprehensive arrangement court ei »j as described here and / or shown in the accompanying drawing, or it relates to such new details or new combinations of comprehensive arrangements and details. Among other things, is after of the invention in particular a device for converting

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and aligning at least two strands of continuous fibers into staple fibers of uniform length, the strands being laid one on top of the other to form a single strand of staple fibers which are characterized is through a first feeding device for moving a first strand of continuous fibers at a certain speed, through a second feeding device to move a second one Strand of continuous fibers at a certain speed, through a first cutting device for pickup of the first strand from the first feeding device and for separating the fibers of the strand along parallel lines inclined to the feed direction and through a second cutting device for receiving the second strand from the second Feeding device and for separating the threads of the strand along parallel, oblique to the feed direction running lines, the first and second cutters being arranged so that when superimposed of the strands to form a single strand this single strand one, seen in plan view, Has rhombic cut arrangement.

Furthermore, according to the invention, inter alia, a method for converting and aligning at least created two strands of continuous fibers in staple fibers of uniform length, which is marked through the following process steps: moving a first strand of continuous fibers at a certain speed, Moving a second strand of continuous fibers at a certain speed, separating the fibers of the first strand along parallel lines which run obliquely to the feed direction, separating the fibers of the second strand along parallel lines that

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run obliquely to the feed direction, and superposition of the first and second strands to form a single strand * which, seen in plan view, is a diamond-shaped one Has sectional arrangement.

The invention is based on an exemplary embodiment described in more detail. Show in the drawing

1 shows the schematic side view of a device according to the invention for carrying out the according to the invention Procedure,

Fig. 2 is a perspective view of the device ™ 1 in an enlarged view, parts of the device being omitted for the sake of clarity are,

3 is a view of the rear draw roller for the second comb station, essentially along line 5-3 of Fig. 1, and

Fig. Is a schematic view of cutting and / or breaking of the Bndlosfasern each of the strands and the arrangement thereof, so that the cutting arrangement λ in the plan view in Rhom- published 4 benform in mutual superposition.

As can be seen from the figures, in which the same or similar parts are provided with the same reference numerals are, tow made of continuous filament tow from a creel generally designated 8, Bobbin rack or the like. the device according to the invention fed. The tow is divided into at least two flat strands Io and 12, which by inevitably driven draw rollers 14 and 16 are promoted. Each of the strands Io and 12 is then appropriately

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Tension rollers 18 out of which they are on infeed roller members 2o and 22 run. The infeed roller members 2o and 22 are positively driven and with the pull rollers 14 and 16 of the slip-on creel through a suitable linkage or the like. (not shown) coupled. Through a certain transmission ratio, e.g. a gear or sprocket transmission, the strands Io or 12 of the tow can be placed under a certain tension so that any crimping is removed from the individual fibers of the tow and the cutters 24 and 26 only staple fibers cut to the same length.

From the infeed roller members, the strands Io and 12 respectively run through cutting devices 24 and 26, where each Strand is cut along parallel lines that run diagonally to the direction of movement of the webs. The strands Io and 12 are then superimposed and brought together close together in a stationary compression station A, where the width of the strand is compressed to a predetermined level. Immediately after their exit from the compression station A, the superimposed strands run, the following ones , referred to as a single strand W, in a first comb station (gilling station) B with a rear Pull roller C, the pull of which is stronger than that of the front roller E. After the only strand W is the first Has left comb station B, it goes through a second one stationary compression station P, in which the width

S.

of the strand continues to be compacted. After the strand has left the compression station P, it passes through immediately thereafter a second or last comb station O with a rear pulling part H and a front one Train part I. After passing through the front train

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partly I the strand W runs through a last, movable one Compaction station J, immediately before a sliver S is conveyed into the coiler K will. The last compression station J compresses the sliver S to a predetermined size and conveys it so that the regulation of the tension on the fuse does not play a decisive role. The rewinder K can be either a high or a low coiler (high coiler or low coiler).

As shown in detail in Fig. 4, the cutters 24 and 26 cut the continuous filaments of strands Io and 12 into staple fibers of uniform length. The strands Io and 12 are closely aligned with one another, the oblique, parallel cuts of one strand being transverse to the oblique, parallel cuts of the other strand, and the two strands then run as a single strand W through the compression zone A, with the fibers are laid randomly like roof tiles (shingled). At the rear pulling part C of the first comb station B, the staple fibers of the strand W are detached from one another, stretched or combined and arranged in a distributed manner. At the front pulling part E, they are still loosened and laid randomly like roof tiles before the strand is compacted in its width in the second twisting part P »The strand runs into the rear pulling part H of the second comb station G, with many bundled and intertwined staple fibers removed .. The The second comb station G, which runs faster than the first comb station, loosens, pulls and combs the strand, however, in order to create a very even sliver which is conveyed from the digestion station J to the winder K g. Station J compresses the Lunt® into a round shape

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of a predetermined size and gives it the longitudinal strength it needs to be of a high or a low rewinder.

As already mentioned above, the pull rollers 14 and 16 of the creel are driven in a timed manner to the infeed roller members 2o and 22. Correspondingly, the cutting devices 24 and 26 as well as the various other elements of the first comb station B, the second comb station G and the compacting station J are all driven in timed relation to one another by a suitable drive linkage, which preferably receives its driving power from a single source. In Pig. 2 of the drawings, the dash-dotted lines marked VS between individual elements schematically represent the driving force of a variable-speed drive. When using a variable-speed drive from a suitable power source P, the system can be operated at speeds between zero and maximum speed will. This feature is of great help in timing the plant and allows it to run at the optimum speed possible for each type of material being processed. With some pasers, a strong static charge occurs at a certain running speed, which does not occur at a slightly lower speed. When using a drive whose speed can be regulated, this does not play a decisive role in the device according to the invention, since the drive can run at the optimum speed for each particular parameter. The device can also be started at very low speeds, whereby the units of the device as well as the

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BATH ORIGINAL

181775a

layer running through the strand are less stressed.

As can be seen in Fig. 2, the cutters 24 and 26 comprise a metal anvil or pressure roller (anvil roll) 25 with a hard, smooth surface and one with at least one helical field 29 made of steel provided cutting roller 27 on. The helical fields 29 on the top roller are those on the lower roller opposite, so that when loosening the strand Io the cutting lines in opposite directions Direction of those of the strand 12 loosened by the lower roller. So if, as in Fig. 4 shows the two strands Io and 12 below mutual contact are superimposed and joined together to form a single strand W are in the upper strand Io, the cutting lines superimposed on those of the lower strand 12 in such a way that in plan view a rhombic pattern appears. Of course, the direction of the screw fields reversed on the respective rollers 27 or the position the cutting rollers are replaced individually or together with their associated anvil or pressure rollers, provided that only the helical fields of the cutting rollers are arranged so that they are parallel in each of the tracks Create cutting lines at right angles to those of the other web.

According to Fig. 1, the pressure rollers 25 and Cutting rollers 27 pressed against one another by the force of springs 51. The spring load can be adjusted so that a suitable pressure of the screw fields 29 against the face of the anvil or pressure rollers, this pressure is typically on the order of 4 * 500 to 5 * 500 lbs. (= 2000 to 2500 kg).

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to dissolve or cut a particular type of fiber. The helical field or fields 29 of the cutting roller 27 of one of the cutting devices 24, 26 are preferably arranged to cut staple fibers of a uniform length that is that large like the length of the uniformly long cut by the cutting roller 27 of the other cutting means "24, 26 Staple fibers. However, if the tow of the strand is to be cut into staple fibers of uniform length, d'ie von.der deviate from the uniform length of the staple fibers cut from the strand 12, so the slope of the field or fields of a cutting roller 27 from the slope of the field or fields of the other Cutting roller be different.

The stationary compression station A contains a metal slide ^ o with walls 32 and 34 running in the direction of movement of the strand W slipping through converge. As can be seen from Fig. 1, encloses an endless Conveyor belt 36 the rollers 4o, 41, 42 and 43 and protrudes under the slide 3oj it also leads the strand W into the slide, the roller 4o with a Pressure roller 46 cooperates, which is pressed by spring means 48 on the conveyor belt. The platen 46 and the conveyor belt together form a constriction from which the web W is conveyed into the combing station B.

The comb station B contains the usual upper and lower fall bars 50 with opposite sides directed pins, which protrude into the strand W, and which are then pulled through the strand W when this is promoted by them. The drop rails enter the leg W at a distance behind the constriction

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between the roller 46 and the conveyor belt J5ö, which is smaller than the length of the cut staple fiber, so that a separation process can take place at this rear pulling station C. Of course, the surface speed of the drop rails in the direction from left to right, viewed in accordance with FIG. 1 or 2, is faster than the surface speed of the roller 46 and the conveyor belt 36, so that all fibers which have not previously been separated are detected at this point will. By appropriately setting the distance between the entry of the drop rails into the strand W and the narrowing of the rear pulling station so that the distance is smaller than the length of the staple fibers cut from the endless fibers, another tile-like arrangement and pulling in the strand takes place, whereby a homogeneous sizing and arrangement of the overlapping fibers is created. The movement of the drop rails in the strand W between the rear pulling station C and the front pulling station E results in a combing action for the fibers, thereby aligning any loops and removing any tufts. .

The front pulling station E reverses the relative movement hose of the drop rails 5o of the combing station B. The front pulling station E includes an upper pressure roller and a lower ^ grooved pull roller 54, which with a second grooved draw roller 56 (Fig. 1) cooperates the rollers have a higher surface speed than the speed of the fall rails 52 is pressed down by spring racks 58. Again, the distance between the narrowed Passage on the rollers of the front pulling station E and the point at which the faller bars 5o from

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derr, strand moved out less than the length of the cut fibers. As the peripheral speeds of rollers 52, 64 and 56 higher than the surface speed with which the fall rails 5o traverse the line, the fall rails 5o act now as a comb in the opposite direction and straighten the rear, curled ends of the fibers and support further straightening or straightening the fibers. There is also a pulling of the fibers and another Separation of cut segments takes place because a tension is exerted on the fibers when their front end into the narrowed passage between the platen 52 and the grooved draw roller enters.

The second compression station F is essentially similar to the compression station A! the stationary slide 6o, however, has an inlet, the width of which is not greater than the exit of the slide J> o and is equal to the width of the comb station B. Of course, the outlet of the slide 6o is narrowed to the width of the second comb station G, whereby the strand W is further compressed.

The rear pulling station H of the comb station G is designed as part of a second endless conveyor belt 62 which is placed around the rollers 64, 66, 68, Jo (FIG. 1). The belt extends below the slide F and is therefore not in contact with the web W when it is in the slide, although it serves as a conveyor for conveying the strand into and out of the slide. The roller 64 cooperates with a pressure roller 72 which is pressed down by spring means 74; the rollers 72 and 64 are narrowed with the band frame boundaries running on the same

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Passage for the rear pulling station H of the second comb station G. From FIG. J5 it can be seen that the roller 72 has a concave surface 76. Due to such concave face an equally strong pressure, distributed over the width of the sliver on entering the restricted passage strand, the spring-like due to the previous treatment (feathered) edges has exerted _r, and there is achieved a uniform train. The spring-loaded edges cannot pull out in tufts without being pulled. It is not necessary to provide the roller 46 of the rear pulling station of the first combing station with a concave surface, since the strand W is more uniform over its entire width as it passes through the narrowed passage of the rear pulling station C.

The second comb station G is the first comb station B Similar in that they have top and bottom drop rails 80, which have the usual pins, is equipped. Of course, the comb station G smaller than the comb station B, since the strand Io on a reduced width is compacted. In addition, the drop rails 80 move at a faster linear speed as the »strand running through the narrowing of the rear pulling station H. However, this becomes critical Ratio between the point at which the drop rails enter the line and the constriction the rear pulling station H maintained in that the distance is shorter than the length of a cut staple fiber, so that in connection with the stretching and Combing the fibers can have a certain separating and overlapping effect.

The. The front pulling station I of the combing station G (Fig. 1) has a pressure roller 82 and a grooved steel roller

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86 equipped. By springs 88 the pressure roller 82 brought into contact with rollers 84 and 86, and there dfe rollers 82, 84 and 86 at a surface speed circulate that is greater than the surface speed of the fall rail 8o through the strand of is left to right in Figures 2 and 3, a final severing and stretching of the fiber ends occurs.

From the front pulling station I, the fuse S runs under a first double-conical roller 9 ° through and over a second double-conical roller 92 away. As a result of double-conical training of the rollers 90 and 92 is the Fuse brought to its final strength and held in a round shape; it receives sufficient strength, in order to hold together in the length required to enter the rewinder K. The lower one presses Roller 90 with the fuse running underneath it on the top of the fuse, while the top roller presses against the bottom of the fuse, causing the latter receives an even higher strength when it enters the winder K. The second double-conical one is in operation Roller 92 at a higher speed than it corresponds to the linear speed of the strands.

As mentioned earlier, it is important that the rear pulling station of the comb station B with considerable higher train than the front train station works. It was found that the rear tensile value for Dacron should be about Io "draft", while the front draft value should be in the vicinity of 1.2 "draft". on the other hand the second comb station O works, which operates at a higher linear speed than comb station B running, with a rear "draft" of 1.6 and a front "draft" of 4. Of course, the

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th "draft" value is only given as an example and can be modified for other pas; the general ratio of the "(draft ¹¹ values for each comb station, however, remains the same.

As shown in FIG. 1, a mixing device labeled loo can be used, which mixes wool fibers W in sliver form behind the rear pulling station for the first combing station B. The wool fibers can of course also be fed to the second combing station G behind the roller J2.

During the cutting of the tow, as a result _-

a certain apostasy from the crushing of the pasers. This ™ Waste sometimes called "fish feed" is collected from above and below the strand at both the first combing station B as well as at the second comb station 0. In detail, a vacuum source V, the is connected by means of suitable lines to a suction head above the pressure roller 52, a second suction head provided below the fall rails 5o and a fourth suction head below the fall rails 8o. As a result the effect of the faller bars on the fibers, the "fish feed" is whirled up and can can be easily pulled off the strand at these points; the remaining fuse remains proportionate | free from waste, and you get a high quality fuse for making yarn.

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Claims (1)

Claims Apparatus for converting and aligning at least two strands of continuous fibers into staple fibers more uniformly Length, with the strands being laid one on top of the other to form a single strand of staple fibers, denotes g e by a first feed device (14, 18, 2o) for moving a first strand (Io) of continuous fibers at a certain speed, through a second feed device (16, 18, 22) for movement a second strand (12) of continuous fibers at a certain speed through a first cutting device (24) for receiving the first strand (Io) from the first feeding device (14, 18, 2o) and for separating the fibers of the strand along parallel lines that are oblique to the feed direction run, and through a second cutting device (26) for receiving the second strand (12) of the second feed device (16, 18, 22) and for separating the threads of the strand along parallel, oblique lines running towards the feed direction, the first and second cutting devices (24, 26) are arranged so that when superimposed on the strands (lo, 12) to form a single strand (W) this single strand (W) one, In Seen from above, has a rhombic sectional arrangement. 2. Apparatus according to claim 1, characterized in that the first cutting device (24) has a rotatable, smooth anvil or pressure roller (25) and a rotatable cutting roller (27) with at least one helical - 14 009882/0770 is Has cutting element (29), which together with the anvil or Pressure roller (25) forms a narrowed passage for separating the threads of the first-mentioned strand (Io), and that the second cutting device (26) is also a rotatable one Anvil or pressure roller (25) and a second rotatable cutting roller (27) with at least one helical Has cutting element, which together with the anvil or pressure roller (25) has a narrowed passage for separating the Forms threads of the second strand (12). 5. Device according to claim 2, characterized in that the helical cutting element M (29) of the first cutting roller (27) is right-handed and the helical cutting element (29) of the second cutting roller (27) is left-handed. 4. Apparatus according to claim 2 or 3 «characterized by g e, that the first cutting roller (27) is designed so that the staple fibers cut by it of uniform length and of the same length as the uniformly long ones from the other cutting roller (27) cut staple fibers. 5. The device according to claim 2 or 3, characterized denotes overall the like, that the first SehneidwAlze (27) is formed so that the staple fibers of uniform length have a different length long uniform than those cut by the other cutting roller (27) staple fibers . 6. Method of converting and aligning at least two strands of continuous fibers in staple fibers of uniform length, g e k e η η ζ e ic h η e t by the following - 15 0098 8 2/07 7 0 Process steps: moving a first strand (Io) of continuous fibers at a certain speed, moving a second strand (12) of continuous fibers with a certain speed, separating the fibers of the first strand (lo) along parallel lines that run obliquely to the Zuführungsriehtung, separating the Trimming the second strand (12) along parallel lines that run obliquely to the feed direction and superimposing it of the first and second strands to form a single strand (W) which, seen in plan view, is diamond-shaped Has sectional arrangement. - 16 0 0 9 8 3 2/0770 Lee on the back