JPH0684570B2 - Method for manufacturing a covering package by winding a twisted yarn - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a covering package used for supplying a covering yarn in a covering step of winding a polyamide filament yarn around a elastic filament yarn in a covering manner. Is.

[Prior Art] As a yarn for producing a knitted fabric having a functional stretchability, a covering elastic yarn formed by covering a polyamide filament yarn with an elastic filament yarn and covering and winding it has been generally used. Particularly, covering elastic yarns made of polyurethane elastic yarns and polyamide yarns have been widely used for stockings.

In the manufacturing process of the covering elastic yarn, the covering yarn is subjected to the covering process as a package wound on a collared bobbin. Conventionally, this covering package has been manufactured by simply rewinding a polyamide filament yarn into a bobbin with a collar by a simple device such as a bobbin reeling machine using a friction drive.

In this conventional method, as shown in FIGS. 5 (a) and 5 (b) (side view and front view, respectively), the yarn (Y) is pulled out from the raw yarn package (41), the guide (42), and the ring type are drawn. The tension is applied by the tensor (43), the bar guide (45), and the traverse by the traverse device (46), and then the bobbin (10) with a collar is wound. here,
The winding device portion includes a friction drive wheel (48) which is fixed to a drive shaft (47) to rotate, a friction roll (49) which is driven to rotate by contacting the drive wheel with its own weight, and an axial center of the friction roll ( 50) (mainly supported by a bearing (not shown)) and is mainly configured by a collared bobbin (10) that is inserted coaxially and rotates integrally with the friction roll. The yarn (Y) wound up on the collared bobbin (10) is tensioned by a tensor, and as the tensor, a ring type tensor (43) (self-weight of a plurality of worn rings (44)) is used. Tensor that applies tension and controls tension by changing the frictional contact angle depending on the balance between thread tension and thread tension), or two sets of comb-like friction resistance bodies made of ceramics, etc. A gate tensor or the like that sets a force and runs the yarn during this is used.

Further, since the productivity of the covering process mainly depends on the rotation speed of the covering bobbin, the covering speed has been increased for this productivity factory. Furthermore, in order to improve the performance of the obtained coated elastic yarn, ultrafine yarns having a denier of 15 denier or less have been used for covering.

[Problems to be Solved by the Invention] However, when the covering package manufactured by the conventional bobbin reeling machine is used, the yarn breakage during covering occurs due to the speeding up of the covering process and the fineness of the covering yarn. There was a big problem of increase. In particular, when the rotation speed became as high as 30,000 rpm or more and 40,000 rpm or so, it was difficult to cover even due to frequent occurrence of yarn breakage.

Furthermore, in the conventional method using the bobbin reeling machine, the rotation speed of the collar-equipped bobbin by the friction drive is only constant, so the actual speed at which the yarn is wound varies with the diameter of the wound layer, which changes with winding. Will change with. The degree of fluctuation of the bobbin diameter varies considerably depending on the yarn fineness, the winding tension, the package diameter and the package condition such as the package form such as the package form. The length was greatly varied, and there was usually a yarn length difference of about 5%. That is, in the conventional method using the bobbin reeling machine, it is difficult to control the length of the yarn wound on the collared bobbin to be constant.

If the yarn length difference between the packages is large, the difference in the yarn length difference at the end of processing in the covering process,
In the covering process which is operated by a system in which a large number of weights are started at the same time and ended at the same time, there are problems such as idle operation, generation of residual yarn waste yarn of the covering yarn, and waste treatment thereof. That is, when the packages are finished in a batch with a short yarn length, all the remaining yarns in the remaining packages become waste yarns, and the amount of waste yarns on the bobbin becomes large (about several percent on average). On the other hand, if you finish the process in accordance with a package with a long yarn length, the problem of the residual yarn amount is solved, but conversely, the elastic fiber of the core yarn is wound up as it is and is wasted by the weight without the covering yarn. In addition, the idle operation reduces the operating efficiency of the machine.

These problems also occur between packages of the same weight, especially in the case of the double covering process using two covering yarn packages on the same weight.

In order to avoid these problems, there is also a rewinding system in which the covering yarn to be fed is stopped before the yarn becomes empty, and the yarn is spliced and restarted. However, the labor and time loss for splicing occur. In addition, not only in the covering step, but also in the knitting step of the obtained covering elastic yarn, another big problem occurs that thread breakage troubles frequently occur at the yarn seam, which is an effective solution. Not not.

Therefore, it is a main object of the present invention to provide a method for producing a covering package capable of suppressing yarn breakage in the covering process to a small amount even if the covering process is sped up or the covering yarn is made finer. .

Another object is to provide a method for manufacturing a covering package in which the length of the wound yarn can be easily controlled and which has a good constant length.

[Means for Solving the Problems] In order to achieve these objects, the present invention provides a polyamide filament yarn at a constant speed, and a bobbin with a brim for covering, and winding the ring twisted yarn at 12 t / m or more into a package. A method for manufacturing a covering package by winding a twisted yarn into a covering package having a surface average hardness of 93 degrees or more (Claim 1), and from the start of winding the twisted yarn to the end of a certain amount of time or a certain length of yarn. The method for manufacturing a covering package by winding a twisted yarn according to claim 1, wherein the winding of the twisted yarn is automatically stopped at the end.

According to claim 1, in the manufacturing process of the covering package, the polyamide filament yarn is fed at a constant speed,
It is important to wind the supplied yarn on a bobbin with a brim for covering at a ring twisting yarn number of 12 t / m or more, and to make the surface average hardness of the twisted-winding package 93 degrees or more.

Further, in the second aspect, means for controlling from the start to the stop of the winding by the elapsed winding time or the length of the wound yarn is further used.

The constant-speed yarn feeding in the manufacturing process of the covering package may be performed by the nip roll method, the roll / separate roll method, or the like, and the constant-speed yarn feeding causes the fluctuation of the fineness and the fluctuation of the unwinding tension. Fluctuations in yarn length are prevented.

Further, the supplied yarn is ring-twisted at a twisting number of 12 t / m or more, whereby the tension becomes almost constant, and the yarn is wound with a constant length.

In addition, since the surface average hardness of the wound package is 93 degrees or more, it is possible to obtain a covering package in which yarn breakage does not occur even during high-speed covering. The package hardness level of 93 degrees or more can be obtained by optimizing the tension at the time of winding. For example, the number of winding twists
Conditions such that the average winding tension from the beginning of winding to the end of winding is set to about 0.25 g / d or more while keeping 13 t / m constant may be adopted. The winding tension can be approximately represented by the tension at the downstream portion of the yarn feeding roll to the winding portion.

The surface average hardness of this package may be measured using an Asker rubber / plastic hardness meter C type (manufactured by Kobunshi Keiki Co., Ltd.).

FIG. 1 is a schematic view showing an example of a process of manufacturing a covering package by winding a twisted yarn by the method of the present invention.

The yarn (Ya) is pulled out from the raw yarn package (1) through the guides (2, 3), and the feed roll (4) and its separate roll (5) are wound to feed the yarn at a constant speed, and the guide (6). ), And further, via a traveler (8) gliding on the ring (7), a bobbin (10) with a collar that rotates.
Rolled up. At the time of winding, the ring (7) reciprocates between the upper and lower flange portions of the bobbin (10), so that the bobbin is uniformly wound.

In this device, bobbin insertion spindle (9)
Is supported on a pedestal (12) via a bearing (13), and is rotated by a driving belt (11) by a running belt (11). A waist spool (14) may be provided for winding the cord at the start.

In this constant-speed yarn-twisting device, the original yarn package part, constant-speed yarn supplying part, ring part, and traverse part can be diverted from the device structure used as a yarn winding device for nylon yarn. it can. In these mechanisms, proper control of dirt, wear, rotatability of rollers, surface condition, sliding property of ring travel, and traveler wear of guides of each part is performed in the normal nylon yarn twisting rewinding process. It may be performed as in the case.

Further, in this device, the spindle part (including the bearing and the passive drum from the belt) in which the bobbin with the brim for covering is inserted and rotated at a high speed may have the same device structure as the bobbin insertion spindle part of the covering device. Good. As a result, the bobbin to be inserted can sufficiently follow even at the same rotational speed level as the covering device, and the cost of the mechanical device can be reduced.

Thus, the device for winding the covering bobbin, which is excellent in high-speed covering property and constant length property, can be easily prepared.

2 (a) and 2 (b) are schematic side views showing steps of producing a single covering elastic yarn, and are a side view and a front view, respectively. Here, the covering package is indicated by reference numeral (10).

3 (a) and 3 (b) show an outline of a process for producing a double covering elastic yarn, and are a side view and a front view, respectively. Here, the covering package is indicated by reference numerals (10 ') and (10 ").

FIGS. 4 (a) and 4 (b) are diagrams schematically showing the yarn form of the covering elastic yarn, showing a single covering elastic yarn and a double covering elastic yarn, respectively. Around the elastic filament yarn (Yu) that forms the core yarn, the covered yarn (Yu)
a), (Ya ′), and (Ya ″) are wound in only one direction or in a superposed manner in two directions to cover the surface of the elastic filament yarn (Yu).

2 and 3, the drive rolls (22, 23) rotate the elastic filament yarn package (21) to feed the elastic filament yarn (Yu), and the first delivery rolls (24, 25) It is pre-drafted to about 1.5 times. The elastic filament yarn is further subjected to a draft of about three times as much as the total draft by the second delivery rolls (32, 33) and enters the covering zone in that state (Yu ').

In the single covering process shown in FIG. 2, the single covering by the covering package (10) is repeated by the third covering.
In the double covering process shown in the figure, double covering is performed by two covering packages (10 ', 10 "). In this case, a spindle (30, 10) for inserting these packages (10, 10', 10") is used. 30 ', 30 ") is rotated by friction between the drive belts (28, 28', 28") and the friction drums (29, 29 ', 29 "), and the covering bobbins (10, 10', 10). ″) Spindle (30, 3)
0 ', 30 ") is for each fixed frame (26, 26', 2
6 ") and the bearings (27, 27 ', 27"). In the double covering process, the two drive belts (26 ', 26 ") run in opposite directions and
The rotation directions of the individual spindles (30 ′, 30 ″) are opposite to each other.

In FIG. 2, the elastic filament yarn (Yu ′) drafted about 3 times passes through the hollow covering spindle (30) and is supplied from the rotating covering package (10). It is wound and covered with polyamide yarn (Pa) to form a single covered yarn (Ys), which is taken up by the second delivery rolls (32, 33) and further traversed by the traverse guide (35) via the guide bar (34). It is wound into a single covered yarn package (38) which is rotated by a drive roll (36). The covered yarn package is rotatably supported by the bobbin chuck (37).

In Figure 3, the drafted elastic filament yarn (Yu) is a hollow covering spindle (30 ', 30 ").
Nylon from the rotating undercover covering package (10 '), underwrapped with nylon thread (Pa'), then from the rotating overcover covering package (10 ") The yarn is covered with a yarn (Pa ″) to form a double covered yarn (Yw), which is wound into a double covered yarn package (39) in the same manner as above.

The polyamide filament yarn used in the method of the present invention may be any filament yarn used as a covering yarn, such as nylon 6 filament yarn and nylon 66 filament yarn.

[Operation] The rotation speed of the covering bobbin in the covering process is successively increased to 25,000 rpm or more, and further to 30,000 to 40,000 rpm. However, by adopting the method of claim 1, yarn breakage during covering is prevented. It is possible to keep it low.

The increase in yarn breakage accompanying the speeding up of the covering process increases the occurrence of yarn loosening on the package due to the high speed rotation of the covering bobbin, and the loose yarn is caught in the air layer friction and turbulence due to the high speed rotation. It is thought that this may be because the single yarns are separated or the single yarns are entangled with each other. The looseness of the yarn on the package is caused by the tension added by the centrifugal force of the yarn itself due to the rotation of the covering bobbin, and the tension is applied at a level proportional to the square of the rotation speed. For example, if the rotational speed is 1.5 times, 2.25 times of tension is applied, and if the rotational speed is 2 times, 4 times of tension is applied. As described above, the higher the speed of the covering process, the more likely the yarn becomes loose.

As a countermeasure, add tension to the thread before winding,
It is considered that it is effective to make the hardness of the winding bobbin package sufficiently high and to prevent the single yarn breakage and the single yarn entanglement by making the yarn converging property to a sufficient level.

In the method of the present invention, a sufficiently high tension is applied by the ring twisting method to wind up as a high package hardness, and further, the ring twisting is performed by heating and focusing under a twisting condition of 12 t / m or more. The measures of can be satisfied at the same time.

On the other hand, in the conventional method, when a large tension is applied to the yarn, the tension ratio before and after the tension applying portion increases,
The abrasion of the yarn here becomes great, and conversely, the trouble of single yarn cracking of the yarn, single yarn sagging or single yarn breakage increases. From these points, there is a limit to the tension that can be applied, and in practice the package hardness could only be increased to about 90 degrees. Moreover, the abrasion of the yarn due to the application of a large tension causes a decrease in the yarn focusing property, so that it is difficult to wind up the yarn having a high focusing property. Thus, in the conventional method,
It is difficult to make a package having a sufficiently high hardness and a yarn package having a sufficiently high bundling property.

However, in the present invention, by winding by the ring twisting method, it is possible to obtain high package hardness without causing a harmful effect due to the addition of tension during winding,
It is considered that this is due to the following actions.

In the conventional method, the abrasion of the yarn is severe due to the addition of tension, and the disorder of the yarn occurs. Speed and bobbin rotation speed, the relationship between these causes the yarn stress (T ₁ ) upstream of the traveler and the yarn stress (T ₂ ) downstream of the traveler to rotate the traveler. In general, this tension is used for nylon filament yarn. In comparison, (T ₂ / T ₁ ) is about 1.1. That is, the abrasion of the yarn with the traveler, which is the only abrasion body, is very slight, and the yarn tension on the upstream side of the traveler, which is the abrasion body, is a high tension close to the target tension,
The rubbing damage on the traveler hardly occurs, and the ring twisted yarn winding method can be said to be an exquisite tension-added winding method.

Further, by adopting the method of claim 2, a package having excellent constant length can be obtained. That is, the length of the winding yarn can be easily controlled by the method of constant speed yarn-ring twist yarn. Furthermore, according to the method of claim 2, as a system in which the winding time or the winding yarn length is made constant, by repeating the production, the yarn length variation between the weights of the multiple weights or between the repeated products can be prevented. The package becomes extremely small and has excellent constant length. The constant time winding causes a slight speed change depending on the voltage fluctuation and the device load condition, but its constant length is within an allowable level. In terms of this constant length property, a constant yarn length control system is preferable in which the yarn fed at a constant speed is controlled by controlling the rotation number of the roller portion.

[Examples] -Example 1 Nylon 6 filament yarn (10
A denier, 7 filament) untwisted drum package was used.

Using this nylon 6 filament yarn, the constant-speed yarn feeding-twist winding device shown in Fig. 1 was used, and the yarn feeding speed was 1,000 m / min, the bobbin rotation speed was 12,500 rpm or 10,000 rpm, and the yarn average was just below the yarn feeding section. Under a condition of tension of 0.3 g / d or 0.1 g / d, the product was wound on a bobbin with a collar having a diameter of the winding portion of 26 mm, a diameter of the collar of 60 mm, and a winding width of 80 mm to manufacture a covering package.

When winding this package, the winding thread length should be 135,000m.
Was controlled to a constant value. The amount of yarn is 150g / d, and the number of twisted yarns is 12.5
It was t / m or 10.0 t / m.

The yarn layer surface hardness of these packages was measured at n = 320,
The results (average value, range) are shown in Table 1.

Next, the obtained package is subjected to a double covering process, in which polyurethane elastic yarn 20 denier is stretched 3.2 times,
Lower bobbin rotation speed 36,000 rpm, winding number 2,400 t /
m, upper bobbin rotation speed 30,600 rpm, winding number 2,04
Double covering was performed under the conditions of 0 t / m, covering speed of 15 m / min, and operating time of 147 hours.

The number of yarn breakages that occurred in this covering process was measured and expressed as the frequency of occurrence of 160 weights per day. Further, the yarn amount of the covering bobbin having residual yarn at the end of the covering was measured and expressed by the maximum value and the average value thereof. Furthermore, the proportion (average value) of bobbins that were empty at the end of covering was also examined. Those results are first
It was as shown in the table.

For comparison, the nylon 6 filament yarn is
Using the conventional method shown in Fig. 5, rewinding was performed under conditions of an average winding tension of 0.3 g / d (by adjusting the ring tensor), a winding speed of 500 m / min (constant), and a winding time of 270 minutes immediately before the traverse. And it was made a package for covering (about 150g winding). Then, double covering was performed in the same manner as above, and evaluation was performed.

As shown in Table 1, in the case of No. 1 according to the present invention,
The surface hardness of the package was high, and the number of yarn breakages during covering was 0.39 times per day (160 spindles), which was significantly less than in the conventional method. Furthermore, even though the ratio of empty bobbins at the end of covering is not more than the same, the amount of residual yarn is small, about 0.26% on average, which is 1 / of the conventional method (No. 4).
It was 10 or less.

On the other hand, in the case of No. 2 or No. 3 in which the twisted yarn condition or the hardness condition was outside the scope of the present invention, the yarn breakage in the covering process could not be sufficiently reduced, and the constant length property was also a little. It was inferior.

Further, in the case of the conventional method (No. 4), even though the surface hardness of the package is about the same as No. 1 according to the present invention, the constant speed yarn and the twisted yarn are not formed, so that the covering step is performed. The yarn breakage and constant length were extremely poor.

-Example 2 Nylon 66 stretched filament yarn (12 denier, 7 filaments) obtained by a normal yarn making method, and the original yarn twist in the package is 14 t / m S twist or 14 t / m Z twist Was used. And for each of the yarns,
A bobbin for covering was wound in the direction in which the S-twist or Z-twist was added by the constant-speed yarn-ring twist yarn winding device shown in FIG. Yarn feeding speed is 1,000m /
Minute, bobbin rotation speed is 1 in S direction and Z direction respectively
At 3,000 rpm, the yarn tension just below the yarn feeder is 0.25 g / d on average.
And And the diameter of the winding part is 32 mm, the diameter of the collar is 76 mm, and the winding width is
It was wound on a bobbin with a flange of 115 mm to manufacture a covering package.

When winding this package, the winding length is 247,500m.
Was controlled to a constant value of, and winding was repeated. The yarn amount was 330 g / d. The yarn layer surface hardness of the package is n
= 224.

Next, the obtained package is subjected to a single covering process, and 20 denier polyurethane elastic yarn is stretched 3.2 times, covering bobbin rotation speed 34,000 rpm, number of windings.
1,700 t / m, covering speed 20 m / min, operating time 188 hours, covering twisting direction is S twisting for S twisting covering package and Z twisting for Z twisting covering package. I covered.

The number of yarn breakages that occurred in this covering process was set to 224
Weight is expressed by the frequency of occurrence per day. In addition, the yarn amount of the covering bobbin having a residual yarn at the end of covering was examined, and the ratio (average value) of the bobbins empty at the end of covering was also examined. The results are shown in Table 2.

As a comparison, the nylon 66 stretched filament yarn was subjected to an average winding tension of 0.2 g / d immediately before traverse (by adjusting the ring tensor) and a winding speed of 500 m / min (constant) by the conventional method shown in FIG. , Rewinding by setting the winding time to 495 minutes, covering package (about 330g winding)
And Then, single covering was performed in the same manner as above and evaluated.

As shown in Table 2, in the case of No. 5 according to the present invention, the yarn breakage during covering was small, and the residual yarn at the end of covering was 0.25% on average, which was good.

On the other hand, in the case of No. 6 by the conventional method, the covering property and the constant length property were poor and the results were poor.

[Effects of the Invention] The covering package according to the method of the present invention is effective for suppressing yarn breakage in the covering step,
It is possible to sufficiently cope with the speeding up of the covering process and the fineness of the covering yarn. In addition, the covering package can be stably manufactured without causing troubles such as single yarn cracking, single yarn sagging, and single yarn breakage and a decrease in bundle focusing property.

Further, the method of the present invention can be carried out by a device which can be prepared relatively easily by appropriately utilizing a device part such as a drawing device for nylon fibers and appropriately combining them, and therefore, the industrial process is easy.

According to the invention of claim 2, it is possible to manufacture a covering package in which the length of the wound yarn is easily controlled and which has a good constant length. Therefore, the operability of the covering machine in the covering process is improved, and it is possible to reduce the amount of covering yarn, the amount of polyurethane elastic yarn, and the labor of the operator.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a process of manufacturing a covering package by winding a twisted yarn by the method of the present invention. 2 (a) and 2 (b) are schematic side views showing steps of producing a single covering elastic yarn, and are a side view and a front view, respectively. FIGS. 3 (a) and 3 (b) are schematic side views showing the steps for producing the double covering elastic yarn, and are a side view and a front view, respectively. FIGS. 4 (a) and 4 (b) are diagrams schematically showing the yarn form of the covering elastic yarn, showing a single covering elastic yarn and a double covering elastic yarn, respectively. FIGS. 5 (a) and 5 (b) schematically show a conventional method in which a polyamide filament yarn is rewound onto a bobbin with a collar by a bobbin reeling machine using a friction drive, and a side view and a front view are shown, respectively. . [Explanation of Codes] 1: Original yarn package 4, 5: Constant speed feeding part (feed roll and separate roll) 7: Ring 10, 10 ′, 10 ″: Bobbin with collar, package for covering Ya: Yarn (polyamide yarn) ) Yu: Elastic filament yarn

Claims (2)

[Claims] 1. A polyamide filament yarn is fed at a constant speed,
A method for manufacturing a covering package by winding a twisting yarn, wherein a ring twisting yarn is wound on a bobbin with a brim for covering at a twisting number of 12 t / m or more to obtain a covering package having an average package surface hardness of 93 degrees or more. 2. The winding of the twisted yarn according to claim 1, wherein the winding of the twisted yarn is automatically stopped when the winding of the twisted yarn is finished for a fixed time or when the winding of a yarn of a fixed length is finished. A method for manufacturing a covering package.