JPS63295375A - Method of winding yarn in pirn - Google Patents

Abstract

PURPOSE:To aim at restraining the rise of a selvage, at enhancing the releasability and at preventing the loosing of the shape by successively repeating gradual increase wind-up, parallel wind-up and gradual decrease wind-up with respect to linear reference lines which decreases the transverse width by every predetermined value. CONSTITUTION:In the case that a pirn 2 is formed on a bobbin 1 while the traverse width is linearly decreased by every predetermined value, gradual increase wind-up (3c to 3a) which gradually increases the traverse width with respect to linear reference lines 3, parallel wind-up which winds up a yarn with the traverse width being parallely decreased and gradual decrease wind-up (3b to 3c) which decrease the traverse width at an acute angle, are successively repeated so as to perform wind-up. In this arrangement, the difference (h) between the maximum and minimum values of the traverse width and the travel time Ta from the initiation to completion of the gradually increase wind-up are set to 2 to 10 mm and 30 to 500 sec., respectively. Further, the dwelling time Tb for one cycle of the parallel wind-up is set to 1/4 to 3 times as long as Ta. Thus, it is possible to restrain the rise of a selvage at the boundary between a conical section 2a and a parallel section 2b, thereby it is possible to enhance the releasability and to prevent loosing of the shape.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a yarn pirn winding method suitable for winding crimped yarn, particularly false twisted yarn.

(Prior art) When drawing and false twisting of synthetic fiber yarn is carried out continuously,
The obtained false twisted yarn is usually wound in a pirn. That is, using a ring twisting machine, the above-mentioned thread is wound around a parallel bobbin in a coil shape with a fine pitch while slowly going up and down the ring rail, and the raising and lowering stroke of the ring rail, in other words, the traverse width of the thread, is adjusted by a predetermined amount at a time. It decreases to form conical portions above and below the winding thread. In the basic pirn winding method in which the traverse width is linearly reduced, the yarn density increases at the boundary between the conical part and the parallel part, causing the yarn layer at the boundary to bulge in a headband shape, resulting in so-called raised ears. Therefore, when the obtained wound yarn (pirn) is set in a knitting machine and the yarn is pulled out, if the yarn speed in the knitting machine is at a high speed of 800 m/min or more, the unraveled yarn gets caught on the selvedge part and breaks. was occurring. Therefore, recently, a variwind method as shown in FIG. 3 has been adopted.

In FIG. 3, 1 is a bobbin, 2 is a pirn, 2a is a conical part, and 2b is a parallel part. The upper and lower dashed lines 3 are the first reference lines, and in the conventional pirn 2, the thread is connected to the upper and lower first reference lines 3.
, 3, and was wound while traversing up and down and gradually decreasing the traverse width.

Single-dot chain A inside this first reference line 3! 4 is a second reference line, and a dotted line 5 drawn in a chevron shape between the first reference line 3 and the second reference line 4 is a third reference line, and in the variwind method, the upper and lower third reference lines 5 I was winding the thread while traversing it at intervals of .5. That is, the solid line 6 indicates the traverse locus of the thread, and when the thread end is wound around the lower end of the bobbin 1,
As the ring rail (not shown) rises, the yarn winding position gradually rises, and when it reaches the upper end of the traverse width, the winding position turns downward, and the traverse width above and below it is set at the third reference line 5. .5, and when the trough 5a is reached, the traverse width is gradually increased, and then when the peak 5b is reached, the traverse width is gradually decreased again, and this process is repeated to form the pirn 2.

(Problems to be Solved by the Invention) In the conventional variwind method, the reversal position of the traverse was simply set on the zigzag-shaped third reference line 5, so the amplitude of this zigzag-shaped third reference line 5, that is, the 1 reference line 3
If the spacing between the second reference line 4 and the second reference line 4 is set small, the effect of adopting the variwind method is lost, and the conical part of the pirn 2
The threads overlap at the boundary between a and the parallel part 2b, making it difficult to unravel the threads.On the other hand, if the above amplitude is set large, the threads overlap.
Although unraveling becomes easier, the boundary portion becomes rounded, making it easier for the pan to collapse.

The present invention improves the burr winding method described above to provide a pirn winding method that allows yarn to be easily unraveled and to obtain a pirn that does not cause pirn collapse.

(Means for solving the problem) In Fig. 1, when the traverse width is linearly reduced by a predetermined width and the yarn is pirn-wound, the above straight line is defined as a reference line 3, and with respect to this reference line 3. Gradual winding in which the traverse width is gradually increased by increasing the traverse width, that is, winding in which the turning point of the traverse is set on the straight line 3 cm 3a, and parallel winding in which the traverse width is gradually decreased in parallel to the reference line 3, that is, in the straight line 3 a. - Winding that sets the turning point of the traverse on 3b, and gradual winding that gradually reduces the traverse width to a steeper angle with respect to the reference line 3, that is, straight line 3b-3c.
Repeat these steps in order to perform winding. However, the difference between the maximum value and the minimum value of the traverse width should be set to 2 to 10 IIn on one side, the moving time from the start of the gradual winding to the end of the gradual winding should be set to 30 to 500 seconds, and one The residence time of parallel winding is set to 174 to 3 times the above moving time.

(Function) Compared to the basic burn winding method in which the turning point of the traverse is placed on the reference line 3, the yarn amount is smaller and coarser winding is performed by the amount within the triangle obtained by connecting the three points 3b, 3c, and 3a. Then, in the next step, a part of the reference line 3, two points 3a and 3b
The traverse is turned around on the straight line connecting the two. In other words, the part where the turning points of the yarn are coarsely dispersed overlaps with the part where the turning points are concentrated and the tendency to stand up overlaps, resulting in a density similar to that of other parts, and when the resulting pirn is wound back, the yarn is The drawer can be easily pulled out and collapse is also prevented.

In this case, experiments have shown that if the yarns overlap a few times in the folded part, the yarns of the upper and lower layers do not become entangled;
There is no problem with the drawer when rewinding, but if there are several overlaps, the threads of the upper and lower layers become entangled and affect the drawer.

That is, if the depth h is less than 2 m, the threads overlap so much that it becomes difficult to unravel the threads, and on the other hand, if the depth h exceeds 101, the pirn shape often collapses. Also, the travel time Ta is 30
If it is less than 500 seconds, it is too short compared to the lifting speed of the ring rail and is not effective. On the other hand, if it exceeds 500 seconds, it is too long and the shape will collapse. Also, the residence time Tb is the travel time Ta
If it is less than 1/4 of the selvage, the amount of selvage is small and the shape will be distorted, whereas if it exceeds 3 times, the threads will overlap more and the unraveling performance will be reduced.

(Example) In Fig. 2, 10 is a ring rail, 11 is a ring,
12 is a traveler in which the ring 11 moves up and down as the ring rail 1o moves up and down, and the thread is supplied from above to the surface of the bobbin 1 which rotates while being supported by a spindle (not shown) at the center of the ring 11. (False twisted yarn) Y is wound while being heated via a yarn guide 13 and a traveler 12 on a ring 11 to form a pirn 2.

Above the ring rail 10, a 5-shaped lever 15 is located which can swing freely around the shaft 14, and this 5-shaped lever 15
The tip of the horizontal part is connected to the upper projection 10a of the ring rail 10 with a pin 15a, and the tip of the vertical part of the figure-5 lever 15 is connected to the tip of the piston rod 16a of the hydraulic cylinder 16 with the pin 15a.
A descending pipe 17a and an ascending pipe 17b, which are connected at 5b and connected to the front end and the rear end of the hydraulic cylinder 16, respectively, are connected to a hydraulic pipe 19 via an electromagnetic switching valve 18. When hydraulic oil is supplied to the descending pipe 17a by the electrical signal, the piston rod 16a retracts and the ring rail 10 descends; conversely, when hydraulic fluid is supplied to the ascending pipe 17b by the electrical signal, the piston The rod 16a is pushed out and the ring rail 10 rises.

Reference numeral 20 denotes a threaded shaft installed vertically on a stationary frame (not shown) on the side, and this threaded shaft 20
includes a lower threaded portion 20a and an upper threaded portion 20b with mutually different directions, and is connected to a reversible motor (not shown) to alternately rotate in the forward and reverse directions. A lower nut 21 and an upper nut 22, which are prevented from rotating and are movable up and down, are screwed into the lower threaded portion 20a and the upper threaded portion 20b, respectively. The lower nut 21 and the upper nut 22 are equipped with ring-shaped non-contact switches 21a and 22a, respectively, and are connected to the signal input end of the electromagnetic switching valve 18 through a lowering circuit 23a and an ascending circuit 23b, respectively. When the non-contact switch 21a of No. 21 closes, the supply of hydraulic oil to the rising pipe No. 1
7b to the descending pipe 17a, and conversely, when the non-contact switch 22a of the upper nut 22 closes, the supply of hydraulic oil is switched from the descending pipe 17a to the ascending pipe 17b.
can be switched to

Reference numeral 24 denotes an elevating frame that moves up and down in conjunction with the elevating movement of the ring rail 10, and is provided near the screw shaft 20. A ratchet 26 is fixed to one end of a horizontal shaft 25 provided on this elevating frame 24, and is intermittently fed by a feed pawl 27 that reciprocates in conjunction with the elevating movement of the ring rail. 26 and the horizontal axis 25 make one revolution. Two plate cams 27a and 27b having the same shape are fixed to the other end of the horizontal shaft 25 with their phases shifted by 180 degrees.

A roller 28a at the upper end of a first elevating shaft 28 which is biased upward and is movable up and down is pressed against the lower surface of the first plate cam 27a on the left side, and a horizontal arm 28b is protruded from the lower end of this first elevating shaft 28. A lower adjustment rod 29a that can be inserted into the ring-shaped endless switch 21a of the lower nut 21 is fixed upward at the tip of the horizontal arm 28b. On the other hand, the second one on the right
A roller 30a at the lower end of a second lifting shaft 30 which is biased downward and is movable up and down is pressed against the upper surface of the plate cam 27b.
A horizontal arm 30b is provided protruding from the upper end of the lifting shaft 30, and an upper adjustment shaft 29 that can be inserted into the ring-shaped endless switch 22a of the upper nut 22 is attached to the tip of the horizontal arm 30b.
b is fixed downward. In addition, the above lower adjustment part 29
a enters the hole of the lower non-contact switch 21a, this lower non-contact switch 21a closes, and the upper adjustment shaft 29b
enters the hole of the upper non-contact switch 22a, the upper non-contact switch 22a is closed.

In the above structure, when the machine base is driven, the ring rail 10 starts moving up and down, the screw shaft 20 starts rotating in one direction, and the lower nut 21 and the upper nut 22 are moved along the reference line in FIG. , 3 and the distance between them gradually narrows to control the traverse width of the ring 11. Further, with the start of the drive, the elevating frame 24 starts to move up and down at the same speed as the ring rail 10, and as the ring rail 1o rises, the lower adjustment frame 24 starts moving up and down at the same speed as the ring rail 10.
9a enters the hole of the lower non-contact switch 21a, the oil path of the electromagnetic switching valve 18 is switched, the ring rail 10 turns downward, and the elevating frame 24 is moved together with the ring rail 1o.
starts to descend, and when this descending progresses and the upper adjustment rod 29b enters the hole of the upper non-contact switch 22a, the oil passage of the electromagnetic switching valve 18 is switched again, and the ring rail 1o and the lifting frame 24 start rising again. do. In this way, the traverse width of the ring 11 narrows according to the reference line 3.3, while the horizontal axis 25 on the lifting frame 24
starts rotating, and the vertical distance from the horizontal shaft 25 to the lower adjustment rod 29a and the upper adjustment rod 29b is
The plate cams 27a, 27 change according to the profile of the plate cam 7b.
The proper traverse width where the rollers 28a, 30a are in contact with the decreasing diameter part of b becomes narrower along the straight line connecting the two points 3b, 3c in FIG. When the two points 3c and 3a are in contact with each other, the traverse width increases along the straight line connecting the two points 3c and 3a in FIG.
When 0a is in contact, the traverse width is 2 points 3a in Figure 1
, 3b, i.e., according to the reference line 3.

A nylon 6 multifilament yarn (30 denier, 10 filaments) was false-twisted using a false-twisting machine equipped with a winding device having the above structure.

However, the false twisting speed was set to 800 m/min, and the heater temperature was set to 18 m/min.
At 0°C, the ratio D/Y of the surface speed of the disk and the false twisting speed was set to 1.75, the stretching ratio DR was set to 3.10, the feed ratio F of the false twisting zone was set to -2%, and the ring rail was The lifting speed was set to 25 seconds/round trip, and the depth h, moving time Ta, and residence time Tb in Fig. 1 were varied to determine the filament's relationship to deformation of the pirn and unraveling properties during rewinding. Compare the cracks. The results are shown in the table below. However, shape deformation, filament cracking, and overall evaluation were evaluated by the following methods.

Filament cracking: A gap is created between the yarns on the surface of the pirn, and the filament of the unraveled yarn falls into this gap, resulting in poor unraveling and single yarn breakage. The pirn is inserted into a horizontal spindle peg and supported rotatably, and the thread on the pirn is unraveled with a load of 0.001 g/d.
Count the number of filament snags that occur while the thread is unraveled 100 times in 1 m increments for a total of 100 m. In this case, there is a close relationship between the number of filament cracks (pieces/loom) and the incidence of user-defective yarn when using yarn of this pirn, and the number of filament cracks is 50 pieces/loom.
100m or less, 51-80 pieces/100m and 80 pieces7
When the length is 100m or more, the user defective yarn occurrence rate is 0.
．． 2% or less, 0.2 to 2%, and 2% or more.

Loss of shape: Fix the pirn horizontally, form a loop with 840 denier thread, hang this loop over the shoulder of the pirn, hang a 40g weight from the bottom of the loop, and slide the loop 5 times. The degree of collapse is divided into 5 grades and evaluated: 1st grade with no collapse, 2nd grade with very little collapse, and 3rd grade with very little collapse.

Those that are present are ranked as 4th grade, and those that are severely affected are ranked as 5th grade.

Overall rating: Evaluated by Pahn users, 0 indicates that there are no problems and is in very good condition, and Δ indicates that there is a problem but it is usable.
Items that cannot be used are marked with an x.

(Blank below) As is clear from this table, Comparative Example 1 using the basic pirn winding method is good with less deformation, but has the most filament cracks. In Comparative Examples 2 and 3 using the conventional burr-winding method in which the residence time was set to 0, and in Comparative Example 4 in which the depth h(no) was excessive, although filament cracking was improved, there were many deformations. In addition, Comparative Example 5, in which the moving time Ta is short, has many filament cracks, and Comparative Example 6, in which the moving time Ta is excessive, has many deformations. Further, Comparative Example 7, in which the depth h was too shallow, and Comparative Example 8, in which the residence time Tb was too long, had many filament cracks, and Comparative Example 9, in which the residence time was short, had many deformations. On the other hand, Examples 1 to 4, in which the moving time Ta, the ill waiting time Tb, and the depth h were appropriate, all had less deformation and filament cracking, and were excellent in overall evaluation.

(Effects of the Invention) According to the present invention, it is possible to suppress ridges at the boundary between the conical part and the parallel part of the pirn, improve unwinding properties during rewinding, and prevent shape collapse. Moreover,
This pirn winding method is possible by providing a trough in the reference line for setting the traverse width for forming the basic pirn, so it is possible to achieve the purpose by simply modifying the profile of the plate cam in the winder. can be achieved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a traverse trajectory showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of an example of a device used in this invention, and FIG. 3 is an explanatory diagram of a traverse trajectory in a conventional variwind. 1: bobbin, 2: pirn, 3: reference line, 6: traverse locus, 10: ring rail, 11: ring, h: depth,
Ta: moving time, Tb: residence time. Patent Applicant Toyobo Co., Ltd. Agent Patent Attorney Yoshi 1) Ryo Figure 1 Figure 3

Claims (1)

[Scope of Claims] [1] Gradual winding in which the traverse width is linearly decreased by a predetermined width and the yarn is pirn-wound, the above-mentioned straight line is used as a reference line, and the traverse width is gradually increased with respect to this reference line. Parallel winding, in which the traverse width is gradually reduced parallel to the reference line, and gradual winding, in which the traverse width is gradually reduced at an even steeper angle relative to the reference line, are repeated in order until the traverse width reaches its maximum. The difference between the value and the minimum value should be 2 to 10 mm on one side, the moving time from the start of the gradual winding to the end of the gradual winding should be 30 to 500 seconds, and one parallel winding should be held. A method for winding a thread with a pirt, characterized in that the time is set to 1/4 to 3 times the travel time. [2] The yarn is a crimped yarn, and the winding speed is 200 to 10
A method for winding a yarn in a pirn according to claim 1, wherein the winding speed is 00 m/min.