JPH03216460A - Thread winding method on drum-shaped package - Google Patents

Abstract

PURPOSE:To suppress the forming of a saddle in a bulge surface layer end part in an intermediate internal layer part by gradually adjusting a traversing speed in accordance with a winding thickness, providing a maximum value of the traversing speed halfway winding and further setting this maximum value to a specific value or more of the traversing speed at the time of winding start, in the case of winding a thread. CONSTITUTION:A traversing speed is gradually increased from a traversing speed TS at a winding start, and the traversing speed is set to 1.1 times or more the speed TS halfway winding corresponding to winding in a swollen part of an intermediate internal layer part end face (R io a winding thickness of a full winding package especially at the time of winding with a winding thickness gamma in a range of 0.1XR to 0.8XR). Consequently, bulge generation is prevented by gradually narrowing the actual winding width before reaching the winding thickness of Tmax from the internal layer and narrowing the actual winding width of an intermediate internal layer part. Since a traversing speed TE at a winding end (at full-winding time) is set to a level lower than the Tmax by gradually decreasing the traversing speed from the maximum value, thread accumulation in the end part of a winding end layer is decreased by gradually spreading the actual winding width over the surface layer from the internal layer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an improvement in a traverse method for winding yarn into a drum-shaped package.

More specifically, the present invention relates to a yarn winding method for obtaining a drum-shaped package in which saddles and bulges can be kept small, the winding shape is good, and high-order processability is also good.

[Prior Art] Winding yarn onto a bobbin to form a drum-shaped package is widely practiced in the silk-spinning process and the like.

During this winding, the yarn is wound while being traversed by a traverse device. Conventionally, a method has been used in which the reciprocating speed of the traverse from the start of winding to the end of winding is kept almost constant without substantially increasing or decreasing. A winding method (hereinafter referred to as constant winding angle winding method) has been used in which the winding angle of the thread to be wound is substantially constant.

Even when winding using this constant winding angle method, the wind ratio (=
In order to prevent ribbon winding that occurs when the bobbin holder rotation speed/number of traverse reciprocations is an integer, short-period swings are generally applied within a range of ±1 to 5% with respect to the center value of the wind angle. There is.

On the other hand, due to the winding tension, delayed recovery of the yarn, and yarn accumulation at the traverse turn-back section, the resulting drum-shaped package has bulges on the end surface of the middle inner layer and protrusions on the end of the surface layer. These are called a bulge and a saddle, respectively (labeled B and S in FIG. 3).

[Problems to be Solved by the Invention] A drum-shaped package with a large bulge or saddle not only looks bad but is also difficult to handle, and the threads on the end surface are likely to be damaged during transportation. In addition, tension fluctuations increase when the yarn is unwound from the package, and furthermore, there are problems such as loops easily coming off during high-speed unwinding, resulting in poor high-order processability and high-order processability. The quality of the product will also be inferior. Therefore, it is required that both the bulge and saddle of the drum-shaped package be kept as low as possible.

In particular, when the delayed recovery of the yarn is high or when the winding tension per denier must be set high, it is difficult to suppress both bulge and saddle to low levels using the conventional constant winding method. It has been difficult to create a drum-shaped package with a good packaging form.

Therefore, the present invention improves the traverse conditions when winding yarn onto a bobbin to form a drum-shaped package, thereby suppressing the formation of both bulges in the middle and inner layers and saddles at the end of the surface layer, and producing a drum. The main purpose is to improve the form of the package. Furthermore, another purpose of this improvement of the package foam is to improve the handling properties, the yarn unwinding properties, and the higher processability and the quality of the higher processed products.

[Means for Solving the Problems] In order to achieve this object, the present invention provides a method of increasing or decreasing the speed of the traverse in accordance with the thickness of the winding when winding the yarn into a drum shape while traversing the yarn in the direction of the winding axis. In particular, the maximum value of the traverse speed exists in the middle of hoisting, and
It is characterized in that the maximum value is 1.1 times or more the traverse speed at the beginning of winding.

The traverse speed increasing/decreasing method according to the present invention will be explained below with reference to FIG. 1 showing one embodiment thereof.

FIG. 1 shows typical examples of changes in traverse speed in the method of the present invention, with the horizontal axis representing the winding thickness γ of the winding drum and the vertical axis representing the traverse speed. Corresponding to the package winding thickness γ, the traverse speed shown on the vertical axis changes gradually, as shown in the figure.

The maximum value (Tmax) of the traverse speed exists during winding, and this maximum value must be 1.1 times or more the traverse speed (TS) at the beginning of winding. This Tm
If the value of ax/TS is less than 1.1 times, it is difficult to achieve the intended purpose of the present invention. Also, this Tmax/
If the value of TS becomes too high, the actual winding width near the winding thickness, which is Tmax, will be too narrow compared to the winding width at the beginning of winding, resulting in a step on the end face of the package or damage to the end face during winding. Other problems tend to occur, such as an extremely large amount of yarn accumulation, which worsens the unwinding property, and a large difference in the quality of the yarn wound between the ends and the center. Therefore, it is preferable to make it about 1.8 times at most. This T
It is further preferable that the value of max/TS is 1.15 times or more.

Further, this maximum value (Tmax) is preferably set at the time of winding within the range of winding thickness γ = 0.1 × R to 0.8 , it is preferable to exist during winding in the range of winding thickness γ=0.2XR to Q.7×R in order to further enhance the effect of reducing bulges and saddles. The traverse speed may be gradually increased from the beginning of winding when γ=0 until it reaches the maximum value (Tmar), and winding at this maximum value is performed as γ=Q,l×R~0. It may be maintained to some extent within a certain range within the range of 8×R, or it may be set to a maximum value such that it gradually increases and then immediately decreases after reaching the maximum value.

The traverse speed from the maximum speed range to the final winding thickness γ where γ=R may be gradually decreased, and the traverse speed (TE) at the final winding thickness γ=R is set to 0.95 of the maximum value (Tmax).
It is preferable to set it to 0.90 times or less, more preferably 0.90 times or less, in order to sufficiently suppress the saddle. Also, this TE/Tm
If the value of ax becomes too low, the difference between the actual winding width at high traverse speeds and the winding width at low speeds becomes too large, resulting in steps and thread drop at the end. Since this problem is likely to occur, it is preferable to set it to at least about 0.55 times.

Increasing or decreasing the traverse speed as described above,
This can be done by increasing or decreasing the traverse speed as the winding time elapses, or by calculating the winding thickness γ by taking the rotational speed of the spindle and calculating the winding thickness γ from that rotational speed. Increasing or decreasing the traverse speed (first
) may be used.

This method of increasing/decreasing the traverse speed is applicable to general traverse devices such as a cam type traverse device, a traverse device composed of rotating blades (Japanese Patent Publication No. 46-16298, etc.), a rotating blade type traverse device, etc. However, it is particularly effective to apply it to traverse devices where the traverse turns at an acute angle or where the yarn length (free length) from the traverse section to the time it is wound into the package is long. be.

In addition, this traverse speed increase/decrease method has a winding speed of 300%.
When the speed is higher than 0 m/min, the yarn fineness is 30
When the yarn is thin, such as less than denier, when the internal stress strain of the yarn to be wound is large, such as when using the direct spinning drawing method in which the spun yarn is taken up and then stretched and wound,
It is particularly effective to apply this method when the winding tension is 0.15 g/d or more.

In order to increase or decrease the traverse speed, for example, the increase or decrease in the traverse speed with respect to the winding thickness or the winding time is input into the computer in advance, and the inverter frequency of the traverse motor is changed in accordance with the input data. It is preferable to use a method that allows the traverse speed to be continuously increased or decreased, as in
This can also be done by dividing the winding thickness into small sections and increasing or decreasing it in multiple steps using a contact switching method or the like.

Note that the traverse speed increasing/decreasing method according to the present invention may be implemented by applying a combination of short-period swing means to prevent ribbon winding, and in this case, the traverse speed is determined by the center value of the swing. Just express it.

[Function] In the process of forming a wound drum-shaped package on a bobbin while traversing the yarn, generally speaking, when the traverse speed is increased, the degree to which the yarn wound on the surface layer of the drum lags behind the traverse speed increases. As a result, the yarn traverse width (actual winding width) at the time of winding on the drum tends to become narrower. Therefore, it is effective to set the traverse speed high in order to reduce the bulge on the end face of the middle inner layer. However, if the traverse speed is set high and the actual winding width is narrowed, the amount of yarn that accumulates at the end of the drum tends to increase, and the number of saddles increases. Therefore, with the conventional method in which the traverse speed is kept constant from the beginning to the end of winding, it is difficult to keep both the bulge and the saddle small.

In the method of the present invention, as shown in FIG. R-
When winding within the range of 0.8 x R), there is a region where the traverse speed is 1.1 times higher than the traverse speed (TS) at the start of winding (Tmax), so the T from the inner layer
The actual winding width gradually becomes narrower until the winding thickness reaches "mal", and it is possible to narrow the actual winding width of the middle and inner layer portions where the package width tends to swell. In this way, the actual winding width is narrowed to compensate for the swelling of the winding layer in the middle inner layer.
It becomes possible to suppress the occurrence of bulges in the resulting package.

Next, this traverse speed is gradually decreased from the maximum value, and the traverse speed (TE) at the end of the winding (when the winding is full) is set to a level lower than the maximum traverse speed (T mat ) (in particular, 0.95 times or less of T mat ), the actual winding width gradually increases from the inner layer to the surface layer, making it possible to reduce the yarn pool at the end of the winding layer.

As a result, generation of saddles can be suppressed.

By increasing or decreasing the traverse speed in this way, the traverse width (actual winding width) at the time of winding from the inner layer to the middle inner layer, middle layer, and surface layer can be adjusted to the winding thickness to compensate for changes in the form of the entire package. Therefore, in the package obtained, the drum width is approximately the same across all layers, including the inner layer, middle inner layer, middle layer, and surface layer, resulting in a package with extremely low bulge. Furthermore, since the traverse speed from the middle layer to the surface layer is low, the saddle can also be kept at a low level.

Furthermore, in the method of the present invention, since the actual winding width is controlled according to the winding thickness by increasing or decreasing the traverse speed, the actual winding width can be changed continuously and gradually.
It is possible to obtain an excellent package form that does not put unnecessary strain on the resulting package and does not cause other troubles such as unrolling.

Furthermore, the present invention can be carried out by simply adding a means for increasing or decreasing the traverse speed, so it can be easily applied industrially.

[Example cosulfuric acid relative viscosity is 2.60. Titanium oxide content is 0.
2vj% nylon 6 was melt spun at 265°C,
After cooling, solidifying, and oiling, the yarn is taken up by the first godet roller, then taken up by the second godet roller without stretching, and then the yarn is traversed by a traverse device consisting of three-axis rotating blades and the winding speed is increased. 420
The winding thickness is 100 m/min and the winding tension is 3.8 g.
It was rolled up into a drum-shaped package of mm. The wound yarn was 10 denier and had 7 filaments.

During this winding, the traverse speed is gradually increased or decreased depending on the winding thickness γ as shown in Fig. 1. This was done by continuously increasing and decreasing the frequency of the traverse motor inverter.

That is, the traverse speed (TS) at the beginning of winding is 2250 cp.
m, and the retraverse speed is gradually increased from the beginning of the winding, and the traverse speed when the winding thickness is 20 to 40 ωm is 2790 cp.
m c=Tsxi. 24) 0) Set to the maximum value (Tmax), then gradually reduce the traverse speed, and set the traverse speed (TE) at the end of the winding to 2230 cpm (=Tmax
X0. 8). Note that this traverse speed always has a 1.5 second cycle and ±2 to avoid ribbon wrapping.
It was performed with a fluctuation of %. The foam of the resulting package was excellent as shown in FIG.

For comparison, winding was carried out under exactly the same conditions as above, except that the traverse speed was kept constant at 2500 cpm from the beginning of winding to the end of winding, and the same oscillation was applied to prevent ribbon winding. went.

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

As shown in Figure 3, the bulge ratio is determined by the drum width a at the beginning of winding.
1 The maximum drum width b is measured and calculated as [(ba)/a]XIOO (%). Further, the saddle height (sh) is a value obtained by measuring the height of a saddle-shaped peak (saddle) existing at the end of the drum surface layer.

In addition, the yarn tension was measured when unwinding the yarn from the obtained drum-shaped package under conditions of an unwinding distance of 30 CL and an unwinding speed of 1000 m/min.
It is expressed by the range of tension fluctuation of the yarn unwound from a layer of 5 mm and a layer of 5 mm winding thickness. Furthermore, the rate of occurrence of loose loops when unwinding at 650 m+/min was also investigated.

From the results in Table 1, it can be seen that when the traverse speed is increased or decreased according to the method of the present invention, the bulge is significantly reduced compared to the conventional method where the traverse speed is constant, and the saddle is also lowered by half. It was possible to create a drum-shaped package with an excellent shape. In addition, fluctuations in the unwinding tension may cause the inner layer,
Both the middle layer and the surface layer have been made smaller, and we have been able to almost completely suppress loop dropouts during unwinding.

[Effects of the Invention] By winding up a drum-shaped package using the method of the present invention in which the traverse speed is increased or decreased, the formation of both bulges and saddles can be suppressed to a sufficiently small size, and a drum-shaped package with an extremely good package form can be obtained. I can do it.

Then, the threads are less likely to be damaged when handling the package, and handling properties are improved. Furthermore, fluctuations in the unwinding tension when unwinding the yarn from the drum-shaped package can be suppressed to a low level, and the occurrence of loose loops during unwinding can be significantly reduced.

Therefore, it is possible to increase the unwinding speed without deteriorating high-order processability, and it is also possible to improve yarn breakage during unwinding. It is also possible to improve the quality of the resulting high-order processed product.

Furthermore, since the method of the present invention is carried out by means of gradually increasing and decreasing the traverse speed, the resulting package is not subject to discontinuous strain, and an excellent package form that does not cause other troubles such as unrolling can be obtained. can and
It is also excellent in terms of industrial implementation.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing the change in traverse speed with respect to the winding thickness γ when the traverse speed is increased or decreased by the method of the present invention. FIG. 2 is a vertical sectional view of a package schematically showing a good shape of a drum-shaped package obtained according to the present invention (example). FIG. 3 is a vertical sectional view of a package 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] Tmax TE: R: Bobbin 2: Yarn layer saddle Sh: Saddle height bulge
a: Drum width at the beginning of winding Maximum drum width Traverse speed value at the beginning of winding 2 Maximum traverse speed value Traverse speed value at the end of winding Winding thickness value at full winding

Claims (2)

[Claims] (1) When winding the yarn into a drum shape while traversing the yarn in the direction of the winding axis, the speed of the traverse is increased or decreased according to the thickness of the winding, and the maximum value of the traverse speed exists in the middle of winding, and A method for winding yarn into a drum-shaped package, characterized in that the maximum value is 1.1 times or more the traverse speed at the beginning of winding. (2) The method for winding yarn into a drum-shaped package according to claim 1, characterized in that the traverse speed at the end of winding is reduced to 0.95 times or less of the maximum value of the traverse speed. (3) The maximum value of the traverse speed exists at the time of winding within the range of winding thickness γ = 0.1 × R to 0.8 × R (where R = the winding thickness of a fully wound package). A method for winding yarn into a drum-shaped package according to claim 1.