JPH09202522A - Yarn winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a yarn of good quality by a method wherein the load of a touch roll is not concentrated on the end part of a yarn winding body the selvage of which is raised and the yarn is prevented from being damaged. SOLUTION: In a yarn winding device comprising a winding shaft on which a bobbin 4 for winding a yarn is mounted; a touch roll 1 making direct contact with the bobbin 4 making contact therewith through a yarn layer 7; and a traverse device for a yarn disposed upper stream from the touch roll 1, the shape of the touch roll 1 satisfies following conditions. (1) Smooth change is effected so that an outside diameter in at least one position B of positions B making contact with the end face parts of a wound yarn body formed by a traverse device is reduced to a value lower than the outside diameter of a position A making contact with the central part of the winding width of the wound yarn body and a difference between the outside diameters of the positions A and B is 0.1-2.0mm; and (2) step parts 2 having each outside diameter higher than that of the position A are situated in respective positions C making contact with the end parts of a bobbin having other width than a winding width W in which the wound yarn body is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding device used for winding a synthetic fiber yarn such as polyester or polyamide on a bobbin.

[0002]

2. Description of the Related Art A winding device as shown in FIG. 4 is used for winding a synthetic fiber yarn such as polyester or polyamide. Hereinafter, a method of winding a yarn using this winding device and a problem in this winding device will be described. First, the winding device includes a bobbin 4 for winding a yarn, a winding shaft (bobbin holder) 3 that rotates by mounting the bobbin 4, and a touch that rotates while contacting the yarn layer 7 wound on the bobbin 4. The roll 1 and a traverse device 5 upstream of the touch roll 1 for traversing the yarn Y.

The spun yarn is applied with an oil agent and entangled, and is guided to a winding device through a godet roller (not shown) while being focused. Then, the yarn Y is traversed in the direction of the arrow by the reciprocating motion of the traverse tip 6 attached to the traverse device 5, and is wound onto the bobbin 4 while contacting the surface of the touch roll 1. Bobbin 4
The yarn layer 7 wound up on is wound up in a cylindrical shape with a winding width that substantially matches the traverse width. When winding,
A load is applied to the touch roll 1 in the vertical direction so that there is no difference in the surface speed between the touch roll 1 and the yarn layer 7.

The touch roll 1 and the bobbin 4 are in contact with each other via the yarn layer 7 during steady winding, but the touch roll 1 and the bobbin 4 are in direct contact with each other at the beginning of winding. Since the bobbin 4 is usually a hard one formed by laminating and stacking multiple layers of paper, if it is brought into direct contact with the loaded touch roll 1 at the start of winding, a small amount of wound yarn The strip is pressed against the bobbin 4 and the touch roll 1 to receive friction. As a result, yarn gathering and overlapping occur, the yarn is damaged, and the quality is degraded. In particular, such damage is remarkable from the beginning of winding to the winding thickness of the thread layer 7 of about 5 to 10 mm, and when the winding thickness is more than this, the thread layer 7 itself plays a cushioning function, The yarn is less damaged.

In order to prevent the touch roll 1 and the bobbin 4 from coming into contact with each other at the beginning of such winding, as shown in FIG. 3, the outer diameter of the end of the touch roll 1 is larger than the outer diameter of the touch roll. A winding device has been proposed in which the touch roll 1 and the bobbin 4 are prevented from contacting each other by providing the step portion 2 having the above-mentioned structure until the yarn layer 7 is formed to some extent (JP-A-4-153166). The gap between the bobbin 4 and the touch roll 1 due to the step portion 2 protects the yarn in the innermost layer portion of the yarn layer 7, and the yarn layer 7 is formed, until the bobbin 4 and the step portion 2 are separated from each other. The difference between the surface velocities is not so large.

However, when the yarn is wound in such a winding device, the traverse of the traverse device causes
The yarns at both ends of the winding width of the wound yarn have a higher bulk density than the yarns at other portions, and depending on the conditions of the take-up tension level and traverse speed, only the diameters of both ends of the wound yarn may be different. It becomes larger and becomes a shape called ear height. When the wound body is formed into such a shape, as shown in FIG. 4, the touch roll 1
Since the load of the touch roll 1 is mainly applied to both ends of the winding body even after the step 2 in which the step portion 2 comes into direct contact with the bobbin 4, the yarns at the both ends of the winding body are damaged and the quality is improved. Will be reduced.

[0007] In particular, when winding a semi-undrawn yarn (POY) having an unstable internal structure of the fiber, if the yarn is damaged, draw unevenness occurs in the draw false twisting step of the post-processing step. However, there is a problem in that the cloth produced by knitting and weaving the processed yarn causes partial dyeing unevenness in the length direction of the yarn.

[0008]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, and the load of the touch roll is not concentrated on the end portion of the wound yarn body at the height of the ear, and the yarn is not damaged.
A technical object is to provide a yarn winding device that can obtain a yarn of good quality.

[0009]

The present inventors have arrived at the present invention as a result of extensive studies to solve the above problems.
That is, the present invention relates to a winding shaft on which a yarn winding bobbin is mounted, a touch roll that comes into contact with the bobbin directly or through a yarn layer, and a yarn traverse device arranged upstream of the touch roll. In the yarn winding device having the above, the gist of the yarn winding device is characterized in that the shape of the touch roll satisfies the following conditions. (1) Of the positions (B) that come into contact with the end face portion of the winding body formed by the traverse device, at least one position (B) where the outer diameter comes into contact with the central portion of the winding width of the winding body ( It smoothly changes so as to become smaller than the outer diameter of A), and the difference in outer diameter between the position (A) and the position (B) is 0.1 to 2.0 mm. (2) A step portion having an outer diameter larger than the outer diameter of the position A is provided at a position C that contacts the end of the bobbin other than the winding width where the wound body is formed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. 1 and 2 are explanatory views showing the shapes of a touch roll and a bobbin of the yarn winding device of the present invention. In the yarn winding device of the present invention, the shape of the touch roll 1 is such that the outer diameter of both or one of the positions B where the touch roll 1 comes into contact with the end face portion of the winding body formed by the traverse device winds the winding body. It is necessary that the width W smoothly changes so as to be smaller than the outer diameter of the position A that contacts the center of the width W, and the difference between the outer diameters of the positions A and B is 0.1 to 2.0 mm.

That is, the vertical load of the touch roll 1 is prevented from being intensively received by the edge-height portions formed at the ends of the wound thread, and the load is applied to as wide a portion as possible near the center of the wound thread. Touch roll 1 for receiving
It is assumed that the shape is changed smoothly so that the outer diameter of the position B is smaller than the outer diameter of the position A.

The shape of the touch roll 1 is not particularly limited, but as shown in FIG. 1, the outer diameter gradually decreases in a quadratic curve from the position A toward the positions B at both ends. Those that are preferable. Alternatively, as shown in FIG. 2, a tapered shape having a parallel portion with a constant outer diameter near the position A may be used. In this shape, the boundary portion 10 between the parallel portion and the tapered portion is chamfered. It is preferable not to damage the yarn.

The difference in outer diameter between the position A and the position B of the touch roll 1 is required to be 0.1 to 2.0 mm, preferably 0.1 to 1.0 mm. If the difference in outer diameter is less than 0.1 mm, the load of the touch roll will be concentrated on the edge of the wound thread at the height of the ear and damage the thread, making it impossible to obtain good quality thread. . When the difference in outer diameter exceeds 2.0 mm, the outer diameter near the center of the touch roll becomes too large, and the load of the touch roll concentrates near the center of the yarn layer, causing damage to the yarn or winding yarn. Twill drop occurs at the body end face, and yarn breakage occurs when the yarn is unwound in the post-processing step.

Further, it is necessary to provide the touch roll 1 with a step portion 2 having an outer diameter larger than the outer diameter of the position A at a position C other than the winding width of the wound body which comes into contact with the end of the bobbin. The step portion 2 prevents the touch roll 1 and the bobbin 4 from directly contacting each other until the thread layer is formed to some extent.
The bobbin comes into contact with the end of the bobbin only for a certain time when the winding is started. The outer diameter of the step portion needs to be larger than the outer diameter of the position A of the touch roll, but protects the yarn in the innermost layer portion of the yarn layer and forms the yarn layer, so that the bobbin and the step portion are separated from each other. It is preferable that the outer diameter of the step portion is about 0.6 to 1.0 mm larger than the outer diameter of the touch roll at the position A so that the difference in surface speed between the two does not become large.

In the yarn winding device of the present invention, the outer diameter of one position B of the positions B where the shape of the touch roll contacts the end face portion of the winding body formed by the traverse device is the winding yarn. The step portion may be provided at both ends of the touch roll, though the step portion may be smoothly changed so as to be smaller than the outer diameter of the position A in contact with the central portion of the body winding width. In the case of a multi-winding device, a touch roll as shown in FIGS. 1 and 2 is used in combination or a touch roll as shown in FIGS. May be.

The finishing of the portion where the outer diameter of the touch roll is smoothly changed may be the same as the surface finishing near the center, and hard chrome plating should be a mirror finish of about 0.4 s or less. Is preferred.

The yarn winding device of the present invention is made of polyester,
It is preferably used in a method of winding a synthetic fiber yarn such as polyamide at a high speed with a winding speed of 2000 m / min or more. When the winding speed is a low speed of 2000 m / min or less, the end of the wound body does not become too high, and the damage to the yarn due to the load of the touch roll is small,
Even if the yarn winding device of the present invention is not used, there is often no problem in the quality of the yarn, but by applying the yarn winding device of the present invention, a yarn of higher quality can be obtained. You can

[0018]

[Evaluation]

◎: Wooster spots (%) ≤ 2.0 ○: 2.0 <Worster spots (%) <4.0 ×: Wooster spots (%) ≧ 4.0 [Measurement conditions] POY yarn false twist yarn yarn feed speed 8 m / min 25 m / min Chart speed 5 cm / min 5 cm / min Full scale ± 25% ± 25% Sensitivity normal normal Measurement thread length 40 m 50 m Worcester spots (%) = (a + b) / 2 a: For the standard of the thickest part within the thread length of 10 m Value obtained by adding the difference rate and the difference rate of the thinnest part and dividing by 2 b: a value within 10 m of the following yarn length (2) Dyeability 1 Using a heater type draw false twisting machine, under the following conditions The processed yarn was knitted by a knitting machine and dyed by a conventional method. At this time, 16 samples were stained as in (1),
The dyeing unevenness of the obtained dyed tubular knitted fabric was visually evaluated as follows. [Conditions for drawing false twisting] Spindle speed 33.5 × 10 ⁴ rpm Twisting speed 2120T / M Heater temperature 200 ℃ Stretching ratio 1.512 Overfeed rate at winding 4.4% [Evaluation] ◎: For all samples No stain spots ○: 1-2 samples with stain spots ×: 3 or more samples with stain spots

Examples 1 to 4, Comparative Examples 1 to 2 Winding was carried out using a turret type winding device having four windings per one winding shaft. As a touch roll of the winding device, the outer diameter of the position A that contacts the center of the winding width of the winding body is 160.0 mm.
Then, the outer diameter gradually decreases toward both positions B that come into contact with the end face of the wound body, and the position C has a step portion with an outer diameter of 160.8 mm. A roll in which four rolls were connected was used. And position A and position B
And the difference Δd in outer diameter between them is 0.05 mm (Comparative Example 1), 0.10 mm (Example 1), 0.50 mm (Example 2), 1.00 mm (Example 3), 2.
Winding was performed using six types of touch rolls of 00 mm (Example 4) and 2.50 mm (Comparative Example 2). Polyethylene terephthalate melted at a temperature of 290 ℃ at a discharge rate of 85 g / min
It was discharged from four 48-hole spinnerets, cooled, and solidified. Then 230 d via a goded roll at a speed of 3500 m / min.
/ 48f yarn on separate bobbins, 100g winding amount POY
(16 in total). At this time, the touch roll provided in the winding device was variously changed to the one described above. First,
The Worcester spot of the obtained POY was measured, and then this P
The draw false twisting process was applied to the OY under the above-described conditions, and the Worcester spots of the false twisted yarn were measured in the same manner as the POY. Then, the false twisted yarn was knitted by a knitting machine and dyed by a conventional method to determine dyeing spots. The results of these evaluations are shown in Table 1.

Comparative Example 3 Spinning and winding were carried out in the same manner as in Example 1 except that a touch roll having the same outer diameter as shown in FIG. 3 was used, and the obtained yarn was evaluated. Table 1 shows the evaluation results.

[0021]

[Table 1]

As is clear from Table 1, in the yarn winding device having the touch rolls of Examples 1 to 4, the yarn can be wound well, and the wound yarn (POY), this POY Both of the false-twisted yarns obtained by drawing and false-twisting had no Worcester spots. Further, the false twisted yarn was tubularly knitted and dyed, and there was no stain. In Example 4, the inner layer portion of the wound wound thread body was slightly twilled, but there was no problem with the yarn quality.

On the other hand, in Comparative Example 3 in which the touch roll having the same outer diameter was not used, the Worcester spot of POY was large and the periodic low fineness portion was developed. From the cycle length in which the low-fineness portion was developed, it was confirmed that the edge portion of the wound body was subjected to the load of the touch roll and was deteriorated. Also, this POY
The Wooster spots of the false-twisted yarn obtained by drawing and false-twisting were also large. Then, unlike the case of POY, the false twisted yarn developed a periodic high-fineness portion. This cycle length is
Since the cycle length of the low-fineness portion of Y coincides with the length obtained by multiplying the draw ratio (DR) in false twisting, the low-fineness portion generated in the POY stage can be smoothly stretched during the stretching in the false-twisting step. This is probably because it was hindered and remained fine. Further, a periodical dyeing unevenness was also found in the yarn knitted and dyed, and the high-definition portion generated in the false twisting yarn was dyed in a dark color.

Further, the difference Δd in outer diameter between the position A and the position B is
In Comparative Example 1 using a touch roll having a thickness of 0.05 mm, although not as great as in Comparative Example 3, Wooter spots having periodicity were generated in both the POY and the false twisted yarn. Further, the yarns obtained by cylindrically knitting the false-twisted yarns and dyeing-processed also had periodic stains.

In Comparative Example 2 using the touch roll having a Δd of 2.50 mm, the wound yarn body is traversed during winding, and yarn breakage due to the traversing occurs to collect 100 g of POY. could not. The yarn data shown in Table 1 shows that the yarn that could be wound before the yarn breakage occurred (about 70
g).

[0026]

By using the yarn winding device of the present invention, the load of the touch roll can be prevented from concentrating on the ear height even if the edge height portion is formed at the end of the wound body by the traverse device. This makes it possible to obtain a yarn of good quality.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the shapes of a touch roll and a bobbin of a yarn winding device according to the present invention, in which a change in the outer diameter of the touch roll is gradually reduced in a quadratic curve.

FIG. 2 is an explanatory view showing another embodiment of the shapes of the touch roll and the bobbin of the yarn winding device of the present invention, in which the touch roll has a tapered shape with parallel portions.

FIG. 3 is an explanatory diagram showing the shapes of a touch roll and a bobbin of a conventional yarn winding device.

FIG. 4 is a schematic diagram showing an embodiment of a conventional yarn winding device.

[Explanation of symbols]

 1 Touch Roll 2 Step Part 3 Winding Shaft 4 Bobbin 5 Traverse Device 6 Traverse Tip 7 Thread Layer Y Thread

Claims (1)

[Claims] 1. A winding shaft on which a bobbin for winding a yarn is mounted,
In a yarn winding device having a touch roll that comes into direct contact with this bobbin or through a yarn layer and a yarn traverse device arranged on the upstream side of the touch roll, the shape of the touch roll satisfies the following conditions: A yarn winding device characterized by the above. (1) Of the positions (B) that come into contact with the end face portion of the winding body formed by the traverse device, at least one position (B) where the outer diameter comes into contact with the central portion of the winding width of the winding body ( It smoothly changes so as to become smaller than the outer diameter of A), and the difference in outer diameter between the position (A) and the position (B) is 0.1 to 2.0 mm. (2) A step portion having an outer diameter larger than the outer diameter of the position (A) is provided at a position (C) that contacts the end of the bobbin other than the winding width where the wound body is formed.