JP2706343B2 - How to wind up yarn on a drum-shaped package - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a spun synthetic fiber yarn which is continuously stretched or not stretched at a high winding speed of 3000 m / min or more.
The present invention relates to an improvement in a traverse method for winding a drum-like package. More specifically, the present invention relates to a yarn winding method for suppressing a saddle and a bulge, preventing ribbon winding, having a good winding shape, and obtaining a drum-shaped package having good high-order workability.

[Related Art] Winding a yarn on a bobbin to form a drum-shaped package is widely performed in a yarn-making process or the like. At the time of this winding, the yarn is wound while being traversed by a traverse device.However, conventionally, a method of making the traverse reciprocating speed from the start to the end of the winding substantially constant without substantially increasing or decreasing, that is, the drum, In general, a winding method (hereinafter, referred to as a constant winding angle method) in which the winding angle of a yarn to be wound is substantially constant has been performed.

Even when winding by the constant winding angle winding method, in order to prevent ribbon winding caused by the winding ratio (= bobbin holder rotation speed / traverse reciprocating circuit) being an integer,
It is common practice to apply a short-period swing with a width of about ± 1 to 5% with respect to the twill angle center value.

On the other hand, in the case of a package in which a manufactured synthetic fiber yarn is wound, due to winding tension, delay recovery of the yarn, yarn pool at the traverse folded portion, the obtained drum-shaped package has an inner layer end face. The bulges and projections are formed at the surface ends thereof, which are called bulge and saddle, respectively (reference numerals B and S in FIG. 3).

[Problems to be Solved by the Invention] A drum-shaped package having a large bulge or saddle not only has a poor appearance but also has poor handling properties, and thus the yarns on the end faces are easily damaged during transportation. In addition, there is a problem that the tension fluctuation when the yarn is unwound from the package becomes large, and there is a problem that a loop is likely to occur at the time of high-speed unwinding. The quality of the product is also inferior. For this reason, it is required that both the basil and the saddle of the drum-shaped package be kept as low as possible.

In particular, when the delayed recovery of the yarn is high or the winding tension per denier has to be set high, it is difficult to suppress both the bulge and the saddle to a low level by the conventional constant angle winding method, It has been difficult to make a drum-shaped package having a good package form.

Accordingly, the present invention improves the traverse conditions when forming the drum-shaped package by winding the yarn on the bobbin, thereby suppressing both the formation of the bulge in the middle inner layer and the saddle at the end of the surface layer, and at the same time, the ribbon winding. And to improve the resulting foam of the drum-shaped package. Another object of the present invention is to improve the handling properties, improve the yarn unwinding property, and further improve the high-order workability and the quality of high-order work products by improving the package foam.

[Means for Solving the Problems] In order to achieve this object, the present invention provides a method of winding a spun synthetic fiber yarn at a high winding speed of 3000 m / min or more without successively stretching or stretching. When winding in a drum shape while traversing in the take-up axis direction, the speed of the traverse is gradually increased / decreased along with the winding, and the maximum value of the traverse speed existing during the winding is the traverse speed at the start of winding.
1.1 to 1.8 times, the traverse speed at the end of winding after gradually decreasing is 0.55 to 0.95 times the maximum value of the traverse speed, and the maximum value of the traverse speed is the winding thickness γ = 0.1
× R to 0.8 × R (where R = representing the winding thickness of a full package) exists during winding, and from the beginning to the end of the winding, ± 1 to 5% of the center value of the helix angle Characterized by performing a short-period swing of a width of

A method of gradually increasing / decreasing the traverse speed according to the present invention will be described below with reference to FIG.

FIG. 1 shows a typical example of a gradual increase / decrease of the traverse speed (hereinafter referred to as an increase / decrease change at the end) in the method of the present invention, where the horizontal axis is the winding thickness γ of the winding drum and the vertical axis is the traverse speed. According to the winding thickness γ of the drum-shaped package shown on the horizontal axis, the traverse speed shown on the vertical axis gradually increases and then gradually decreases as shown in the figure.

Then, the maximum value (Tmax) of the traverse speed exists during winding, and this maximum value needs to be 1.1 to 1.8 times the traverse speed (TS) at the start of winding. This Tmax / TS
Is less than 1.1 times, it is difficult to achieve the intended object of the present invention. If the value of Tmax / TS is too high, the actual winding width in the vicinity of the winding thickness at which Tmax becomes too narrow compared to the winding width at the beginning of winding, so that a step is formed on the package end face, Another problem is that the amount of yarn pooling on the end face being picked up becomes extremely large and consequently the unwinding property deteriorates, and the difference in yarn quality between the yarn wound around the end and the center part increases. Due to problems, the maximum is 1.8 times. This value of Tmax / TS is preferably 1.5 to 1.8 times.

Further, this maximum value (Tmax) is determined by the following formula:
0.8 x R (where R = thickness of full package)
At the time of winding in the range of, preferably, the winding thickness γ = 0.2 × R
It is necessary for a bulge and saddle reduction effect to be present during winding in the range of 0.70.7 × R. γ =
The traverse speed may be gradually increased from the beginning of winding 0 to the maximum value (Tmax).
It may be maintained to some extent within a certain range in the range of γ = 0.1 × R to 0.8 × R with respect to the increase of the winding thickness γ, or a maximum that gradually increases and then decreases immediately after reaching the maximum value. It may be a value.

The traverse speed from the maximum speed range to the final winding thickness γ where γ = R may be gradually reduced, and the traverse speed (TE) at the final winding thickness γ = R is 0.55 to 0.95 of the maximum value (Tmax).
Times, preferably 0.55 to 0.90 times. 0.95 times or less is necessary for sufficient suppression of the saddle. Also, this TE
If the value of / Tmax is too low (4), the difference between the actual winding width at high traverse speed and the winding width at low traverse speed becomes too wide, resulting in stepping or thread dropping at the end face. Because there is another problem, it should be at least 0.55 times.

The traverse speed may be increased or decreased as described above by increasing or decreasing the traverse speed with respect to the elapse of the winding time. γ may be calculated to increase or decrease the traverse speed with respect to the winding thickness γ (FIG. 1).

As described above, the method of the present invention for increasing and decreasing the traverse speed is based on a traverse device constituted by rotating blades (Japanese Patent Publication No.
The present invention is particularly effective in the case of Japanese Patent Application Laid-Open No. 46-16298, and is also effective for a traverse device in the case where the yarn length (free length) from the traverse portion to the winding of the package is long.

In addition, this traverse speed increase / decrease change method is a method in which a spun synthetic fiber yarn is continuously drawn or drawn without being drawn at a high winding speed of 3000 m / min or more, and traversed in the winding axis direction to form a drum. This is effective when winding up. In particular, when winding polyamide filament yarn produced at high speed (when internal stress distortion is large) or when the yarn fineness is
When the thickness is as thin as 30 denier or when the winding tension is 0.15
It is particularly effective to apply to cases such as g / d or more.

In order to increase or decrease the traverse speed, for example,
The traverse speed is continuously increased or decreased by inputting the increase or decrease of the traverse speed with respect to the winding thickness or the winding time to a computer in advance and changing the inverter frequency of the traverse motor in accordance with the input data. It is preferable to adopt a method capable of increasing or decreasing, but it is also possible to employ a method of dividing the winding thickness into small sections and increasing or decreasing the winding thickness in multiple steps by a contact switching method or the like.

Further, the traverse speed increasing / decreasing method according to the present invention employs a combination of short-period swing means having a width of ± 1 to 5% for preventing ribbon winding. In this case, the level of the traverse speed to be increased or decreased may be represented by the center value of the swing.

[Operation] In the step of forming a winding drum-shaped package on a bobbin while traversing a yarn, generally, if the traverse speed is increased, the degree of delay of the yarn wound on the drum surface layer with respect to the traverse speed is delayed. Therefore, the yarn traverse width (actual winding width) at the time of winding on the drum tends to be narrow. For this reason, it is effective to set the traverse speed high in order to reduce the bulge (bulge) of the end face of the middle inner layer portion. However, when the traverse speed is set high and the actual winding width is narrowed, the amount of yarn accumulated at the end of the drum tends to increase, and the saddle increases. Therefore, it is difficult to suppress both the bulge and the saddle by the conventional method in which the traverse speed is constant from the beginning to the end of winding.

In the method of the present invention, as shown in FIG. 1, the traverse speed is gradually increased from the beginning of winding, and during the winding corresponding to the winding of the swollen portion on the end face of the middle inner layer portion (in particular, when the winding thickness γ is 0.1 × R
The traverse speed is 1.1 to 1.8 times the traverse speed (TS) at the beginning of winding (Tm).
ax), the actual winding width gradually decreases from the inner layer to the winding thickness that reaches Tmax, and the actual winding width of the middle inner layer part where the package width tends to swell can be reduced. it can. As described above, since the actual winding width is reduced so as to compensate for the swelling of the winding portion of the middle and inner layer portion, it is possible to suppress the occurrence of bulge in the obtained package.

Next, the traverse speed is gradually reduced from the maximum value, and the traverse speed (TE) at the end of winding (at full winding) is lower than the maximum traverse speed (Tmax) (0.55 to 0.
(95 times), the actual winding width from the inner layer to the surface layer gradually increases, and the yarn pool at the end in the winding end layer can be reduced. As a result, the occurrence of saddles can be suppressed.

By increasing or decreasing the traverse speed in this manner, the traverse width (actual winding width) at the time of winding from the inner layer of the drum to the middle inner layer, the middle layer, and the surface layer is adjusted so as to compensate for the form change of the entire package. Can be changed according to
The drum width is substantially the same in all the inner, middle, middle and surface layers, resulting in a package with extremely low bulge. Further, since the traverse speed from the middle layer to the surface layer is reduced, the saddle can be suppressed to a low level.

In the method of the present invention, the actual winding width is controlled according to the winding thickness by means of increasing or decreasing the traverse speed.
The actual package width can be changed continuously and gradually, and therefore, a superior package form that does not cause other troubles such as winding collapse, even if the resulting package is not discontinuous. Can be.

Furthermore, the present invention can be implemented only by adding means for increasing or decreasing the traverse speed,
It can be easily applied industrially.

[Example] Nylon 6 having a sulfuric acid relative viscosity of 2.60 and a titanium oxide content of 0.2 wt% was melt-spun at 265 ° C, cooled and solidified, refueled, taken up by a first godet roller, and then stretched. The second godet roller pulls the yarn, and then traverses the yarn with a traverse device composed of three-axis rotating blades, while winding at a speed of 4200 m / min and winding tension of 3.8 g.
Under the above conditions, the film was wound into a drum-shaped package having a winding thickness of 100 mm. The wound yarn was 10 denier and 7 filaments.

At the time of this winding, the traverse speed is gradually increased / decreased according to the winding thickness γ as shown in FIG. 1, and the traverse speed control is performed by controlling the control data of the winding thickness and the traverse speed which have been input to a computer in advance. Thus, the frequency of the traverse motor inverter was continuously increased and decreased. That is, the traverse speed (T
S) is 2250cpm, the traverse speed is gradually increased from the beginning of winding, and the traverse speed when the winding thickness is 20 to 40mm is 2790cpm
(= TS × 1.24) maximum value (Tmax), after which the traverse speed is gradually reduced, and the traverse speed at the end of winding (TE)
Was set to 2230 cpm (= Tmax × 0.8). Note that the traverse speed was generally applied with a swing of ± 2% at a period of 1.5 seconds to avoid winding the ribbon. The foam of the obtained package was excellent as shown in FIG. 2 and Table 1 with no bulge, no saddle, and no ribbon winding.

As a comparison, the winding was performed under exactly the same conditions as above, except that the traverse speed was kept constant at 2500 cpm from the start to the end of the winding, and the swinging of the ribbon winding prevention was applied as described above. went.

The winding shape of the full drum-shaped package wound under each condition was evaluated by the bulge ratio and the height of the saddle.

As shown in FIG. 3, the bulge ratio is obtained by measuring the drum width a at the beginning of winding and the maximum drum width b, and calculating [(ba) / a] × 100.
(%). Also, saddle height (Sh)
Is a value obtained by measuring the height of a saddle-shaped mountain (saddle) at the end of the drum surface layer.

From the obtained drum-shaped package, the yarn tension when unwinding the yarn at the unwinding distance of 30 cm and the unwinding speed of 1000 m / min was measured, and the layer having a winding thickness of 90 mm and the layer having a winding thickness of 35 mm were measured. And winding thickness
It was expressed as the tension fluctuation width of the yarn unwound from the 5 mm layer. Furthermore, the rate of wheel slippage when unwinding at 650 m / min was also examined.

From the results shown in Table 1, when the traverse speed was increased or decreased as in the method of the present invention, the bulge was significantly reduced, the saddle was reduced by half, and the ribbon was reduced, as compared with the conventional method in which the traverse speed was constant. There was no winding, and a drum-shaped package having an excellent package shape could be obtained. In addition, the fluctuation in unwinding tension was reduced in any of the inner layer, the middle layer, and the surface layer, and wheel slippage during unwinding could be almost completely suppressed.

[Effects of the Invention] When a drum-shaped package is wound by the method of the present invention in which the traverse speed is increased or decreased, generation of both bulges and saddles can be sufficiently suppressed, and ribbon winding can be prevented. A good drum-shaped package can be obtained.

Then, the yarn is less likely to be damaged during handling of the package, and handling is improved. Furthermore, fluctuations in unwinding tension when unwinding the yarn from the drum-shaped package can be suppressed to a low level, and the occurrence of wheel slippage during unwinding can be significantly reduced. Therefore, the unwinding speed can be increased without deteriorating the high-order workability, and yarn breakage during unwinding can be improved. Then, the quality of the obtained higher-order processed product can be improved.

In addition, since the method of the present invention is performed by means of gradually increasing and gradually decreasing the traverse speed, the obtained package does not suffer from discontinuous unreasonableness, and an excellent package foam which does not cause other troubles such as winding collapse. It is also excellent in industrial practice.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a change in traverse speed with respect to a winding thickness γ when a change in traverse speed is performed by the method of the present invention. FIG. 2 is a package longitudinal sectional view schematically showing a good shape of a drum-shaped package obtained by the present invention (example). FIG. 3 is a package longitudinal sectional view showing an example of a bad shape of a drum-shaped package obtained by a conventional method with a constant traverse speed. [Explanation of symbols] 1: Bobbin, 2: Thread layer S: Saddle, Sh: Saddle height B: Bulge, a: Drum width at start of winding b: Maximum drum width TS: Traverse speed value at start of winding Tmax: Traverse Maximum speed TE: Traverse speed at the end of winding R: Thickness value at full winding

 ────────────────────────────────────────────────── ─── Continuation of the front page Examiner Hiroshi Watanabe (56) References JP-A-52-15642 (JP, A) JP-B-61-39266 (JP, B2) JP-B-59-5501 (JP, B2)

Claims (3)

(57) [Claims] Claims: 1. A spun synthetic fiber yarn is continuously stretched or not stretched at a high winding speed of 3000 m / min or more,
When winding in a drum shape while traversing in the winding axis direction, the speed of the traverse is gradually increased / decreased with the winding, and the maximum value of the traverse speed existing during winding is 1.1 to 1.8 times the traverse speed at the start of winding. The traverse speed at the end of winding after the taper is gradually reduced is 0.55 to 0.95 times the maximum value of the traverse speed, and the maximum value of the traverse speed is determined by the thickness γ = 0.1 × R to 0.8 × R (R
= Represents the winding thickness of a full package) and swings in a short cycle of ± 1 to 5% of the helix angle center value from the beginning to the end of winding, from the beginning to the end of winding. A method for winding a yarn on a drum-shaped package. 2. The method according to claim 1, wherein the traverse of the yarn is performed by a rotary blade type traverse device. 3. The method according to claim 1, wherein the synthetic fiber yarn to be wound is a polyamide filament yarn produced at a high speed.