JPH02209364A - Winding method for synthetic fiber filament - Google Patents

Abstract

PURPOSE:To prevent any filament double in a package inmost layer part as well as to prevent a filament release failure from occurring by changing a periodic variable pattern of traverse speed according to yarn layer thickness of a package. CONSTITUTION:Traverse speed V is set within the range of (n-1)/2<WL/2piRV <n/2 only when yarn layer thickness (t) of a package is within the range of 0<=t<=0.005D. Where, t = package yarn layer thickness mm, D = filament fineness d, w = winding speed cm/min, pi = circumferential ratio, R = package radius cm, V = traverse speed cm/min, L = traverse stroke cm, and n = optional positive integer. Thus, in the yarn layer thickness of the package, traverse speed and change width can be set so as not to let a wind number N be the positive integer and integer + or -1/2 in a package inmost layer part, so that any ribbon lap is kept back and a release failure is prevented from occurring.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a method for winding synthetic fiber yarn, especially thick synthetic fiber yarn, using a turret-type automatic switching high-speed winding machine. It is possible to reduce the trouble of unwinding the yarn and obtain a good package before winding.
Moreover, the present invention relates to a winding method that can improve quality and productivity.

(Prior art) Generally, when winding a single synthetic fiber yarn onto a bobbin while traversing it using a traverse mechanism to form a winding package on a bobbin, if the winding is performed at a constant speed without varying the traverse speed, the number of winds (N) is positive. Integer and integer ±1/2
When this occurs, the yarn is wound overlapping and a noticeable twill, so-called ribbon wrap, occurs, and if this ribbon wrap is large, it is said to cause poor package shape and unwinding trouble when unwinding the yarn in the post-processing process. There was a problem.

In order to solve this problem, conventional methods used a dastarvance mechanism to vary the traverse speed in short cycles from the beginning of winding the package until it was fully wound to reduce the overlap of the twills.
Efforts were made to prevent the above-mentioned troubles from occurring. Note that the wind number (N) here is defined by the formula 0.

N= (WL)/(2πRV)・・・−1−−−−
−−−−−−−−−・−・− ■In recent years, when manufacturing synthetic fibers for industrial materials, especially thick synthetic fibers, the conventional two-step method in which spinning and drawing are performed in separate processes has been adopted. Instead to,
Direct spinning and drawing methods, in which spinning and drawing are directly connected, have become widely adopted. In this direct spinning and drawing method, in order to keep the spinning speed at least at the conventional level from the viewpoint of productivity, the winding speed is extremely high. For example, synthetic fibers for industrial materials made of polyamide or polyester are directly spun. When producing by drawing method, the spinning speed is usually 3
00~800m/min.

At this time, the winding speed depends on the stretching ratio, but it is approximately 2000 to 4
000m/min.

Conventionally, even in high-speed winding in such a direct spinning drawing method, a winding method has been adopted in which the traverse speed is periodically varied from the beginning of winding the package to the full winding of the package.

FIG. 2 is a diagram showing an embodiment of the conventional method, FIG. FIG. 2 is a diagram showing the relationship between the number of winds (N) and the package yarn [7(t)] when wound at a traverse speed (V).

As shown in Figure 2 (a), the conventional winding method is as follows.

The traverse speed is varied in short cycles from the beginning of winding of the package to the full winding of the package, and as shown in Figure 2 (b), the resulting package has The number of winds (N) between positive integers and integers ±1/2 corresponds to a positive integer and an integer ±1/2, and the threads are wound overlapping each other, causing ribbon wrap, which occurs a lot, especially in the innermost layer of the package. However, with this winding method, the above-mentioned problems could not be completely solved.

In other words, from the beginning of the second winding, when the yarns overlap in the innermost layer of the package and ribbon wrap occurs, the first winding speed is high, so the overlapping part of the yarn and the valley part where the yarn does not overlap are different from each other in the radial direction of the package. The difference in the winding diameter becomes large, and the winding speed of the yarn differs greatly between the triple overlap part and the trough part. At this time.

Since the winding speed of the yarn wound in the trough is low, the winding tension is low, and the yarn is wound in a loose state.

This phenomenon in which the yarn is wound in a loose state frequently occurs in the innermost layer of the package, especially in the range of several 1 yarn layer thickness from the beginning of winding.In other words, ribbon wrap is frequently formed in the innermost layer of the package. ).

Moreover, since the loosely wound parts are wound close to each other in the radial direction of the package (that is, in the yarn layer thickness direction), when unwinding the yarn from the package in the post-processing process, it is difficult to unwind the package. The threads become tangled in the inner layer and cannot be unraveled.

Tail migration is not possible, or even if unwinding is possible, single thread breakage and fuzz occur, reducing quality. moreover.

When a package is packed and transported, problems such as the winding layer of the package being shifted due to vibration during transport have arisen.

(Problems to be Solved by the Invention) The present invention provides a good package form and good process passability in post-processing steps when winding 9 synthetic fiber yarns, especially thick synthetic fiber yarns, at high speed. The purpose of this invention is to provide a winding method that allows

(Means for Solving the Problems) As a result of intensive studies to solve the above problems, the present inventors have solved the above problems by changing the periodic variation pattern of the traverse speed according to the yarn layer thickness of the package. We have found that this problem can be solved and have arrived at the present invention.

In other words, one aspect of the present invention is a scroll cam type traverse mechanism and a turret that can freely rotate once.

The yarn is traversed by the traverse mechanism using a turret-type automatic switching high-speed winder having a plurality of bobbin holders on the turret, and the traverse speed (V) is periodically varied using a dastarvance mechanism. In a synthetic fiber yarn winding method in which the yarn is wound around a bobbin attached to the bobbin holder, the traverse speed (V
The gist of the present invention is a method for winding synthetic fiber yarn, which is characterized in that the traverse speed (V) is set so that ) satisfies the equation 0.

0≦t≦0.0005D, --・---
1--...-■ [t: package thread layer thickness (m11)
, D: Yarn fineness (d), W: Winding speed (cm/
minute), π: Pi, R: Package radius (cIll)
, V: traverse speed (cm/min).

L: traverse stroke (ca+), n: any positive integer] Next, two methods of the present invention will be specifically explained based on the drawings.

FIG. 1 is a diagram showing one embodiment of the method of the present invention,
Figure 1 (a) is a diagram showing the waveform of traverse speed (V),
Figure 1 (b) shows the traverse speed (V) shown in (a).
FIG. 3 is a diagram showing the relationship between the number of winds (N) and the package yarn layer thickness (1) when winding is performed.

The method of the present invention involves traversing the yarn using a traverse mechanism, and periodically varying the traverse speed (V) using a dastarvance mechanism. In the innermost layer of the package where the yarn layer thickness (1) is defined by formula 0, the traverse speed (V) and This is to set the fluctuation range. Note that the yarn layer thickness (1) of the package as used in the present invention is the distance from the winding surface of the bobbin in the radial direction of the package to one winding surface. What is the fluctuation range of the traverse speed (V) at this time?

Due to the fluctuation, the wind number (N) is a positive integer and an integer ±
It is necessary to set the width so that it does not correspond to 1/2, and it is varied within a range that does not substantially cause ribbon wrap, but more preferably, as shown in FIG. 1 (A), The fluctuation range is set to 0.

Next, until the yarn layer thickness (1) increases and exceeds O,0005D and reaches full winding, the yarn layer thickness (1) is varied within a normal variation range. For head loading with yarn layer thickness (1) exceeding 0.0005D.

Ribbon wrap occurs when yarns are wound overlapping each other, but 1.The overlapping time of the yarns is shortened due to the normal fluctuation range, and the ribbon wrap portion is buffered by the winding yarn, so the above-mentioned No such problems will occur. In addition, when changing the normal fluctuation width after passing the innermost layer, the fluctuation width should be set to [(Steady traverse speed) x (± about 3 to 15%)] 22 laps for about 2 to 20 seconds. It's good to do that.

In the method of the present invention, a thick yarn 2 for industrial materials, for example, a thick yarn having a fineness of 1000 deniers or more is 2000Il1
This is particularly effective when winding at high speeds of more than 1 minute.

(Example) Hereinafter, the method of the present invention will be specifically explained based on Examples.

Example 1 After melting nylon 6 chips, they were spun from a spinneret having 316 spinning holes with a diameter of 0.45 mm, and after the spun yarn was cooled and solidified, a non-aqueous oil was applied, and it was taken up by a take-up roller. - Continuous multi-stage stretching without winding, and winding using a turret-type automatic switching high-speed winding machine that has a scroll cam type traverse mechanism, a turret that can rotate freely once, and two bobbin holders on the turret. A fully wound package (winding amount: 9.5 kg) of nylon 6 drawn yarn with a fineness (D) of 1890 d was formed under zero winding conditions: winding speed (W) 2300 x 10” CI/min, steady traverse speed (V ) 33855cm/min.

The traverse stroke (L) was 30.5c, and the bobbin diameter was 8.9CII+. The radius of a full package is approximately 12. It was ICl11. When winding up, please refer to Figure 1 (
As shown in b), in the innermost layer of the package from the beginning of the second winding to the package yarn layer thickness (m) of 1.5 mm specified by 33,855 cm/min constant (ie, the fluctuation range is O), and the yarn layer thickness (1) of the package is 1.5
ml++ and up to full winding, the day starvance mechanism changes the fluctuation range ((33855c11+/min) x (±8%) against the steady speed of 33855cm/min)
], a fluctuation with a period of 10 seconds was added. The relationship between the package yarn layer thickness (1) and the number of winds (N) at this time is as shown in FIG. 1 (b).

The occurrence of yarn loosening in the innermost layer of the obtained package was evaluated. Furthermore, the obtained package was supplied to a yarn twisting process, and the operational status of the innermost layer of the package was investigated. A DTC machine manufactured by Kaji Tekkosho was used as a twisting machine, heating rate was 8000T/min, number of first twists was 32T/10c.
Twisting was performed under the conditions of +++ and number of twists of 32T/10c+s. The results are shown in Table 1. The occurrence rate of loosening in Table 1 is the ratio (%) of the number of packages in which loosening was observed in the innermost layer of the package when the packages were unwound by hand to the total number of 100 packages. The rate is the total number of packages (20), which is the number of packages in which the yarn was broken due to unwinding failure in the innermost layer of the package.
It is the ratio (%) to 00.

In the obtained package, the traverse speed (V) is constant at the innermost layer of the package from the starting point to the package yarn layer thickness (1) of 1.5 mm, and no fluctuation is added, and the number of winds is (N) also varies within the range of 7.4 and 7.1, and the innermost layer of the package contains yarn whose wind number (N) corresponds to a positive integer and an integer ±1/2. There was no phenomenon in which the strips were wound overlapping each other and ribbon wrap occurred. Moreover, the obtained package had a good 9-roll form and was excellent in passability through subsequent processes.

Comparative Example 1 As shown in Figure 2 (A), from the beginning of the second winding until reaching the full winding, the traverse speed (V) was 33,855 cm.
/min except that a fluctuation of period 10 seconds was added by the dastarvance width ((33855cm/min) x (±8%)).

In the same manner as in Example 1, a full package (winding fi 9.5 kg) of nylon 6 drawn yarn with a fineness (D) of 1890 d was prepared.
was formed. The relationship between the number of winds (N) and the package yarn layer thickness (1) at this time is shown in FIG. 2 (b).

Furthermore, Table 1 shows the evaluation results of the obtained packages.

Since the traverse speed (V) of the obtained package constantly fluctuates within the above range from the beginning of the second winding until it reaches full winding, the number of winds (N) also changes within a range of approximately 1.2. The package has a winding number (N) of 8.0.7.5° and 7.0 at three locations, especially in the innermost layer where the package yarn layer thickness (1) is III11 or less. Ribbon wrap, in which yarns are wrapped in an overlapping manner, occurred. Because these ribbon wraps are formed radially close to the package.

The resulting package had many loose threads. In addition, since there were many packages with defective shapes in the innermost layer, when the yarn of the package was unwound in the post-processing step, the yarn was cut due to poor unwinding in the innermost layer.

Table 1 (Effects of the Invention) According to the present invention, when winding synthetic fiber yarn, especially thick synthetic fiber yarn, with a turret-type automatic switching high-speed winding machine, the yarn in the innermost layer of the package is By preventing overlapping, a good package form can be obtained, and it also eliminates problems such as poor unwinding due to yarn entanglement during unwinding of yarn in the post-processing process, occurrence of single yarn breakage and fuzz, etc. moreover,
It is also possible to prevent roll layer misalignment during packaging and 1gR feeding.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the method of the present invention, and FIG. 2 is an explanatory diagram showing an embodiment of the conventional method.
In each figure, (a) is a diagram showing the waveform of the traverse speed (V), and (b) is a diagram showing the relationship between the winding number (N) and the package yarn layer thickness (t). Job Mei Patent Applicant Unitika Co., Ltd. Unitika Equipment Technology Co., Ltd.

Claims (2)

[Claims] (1) Using a turret type automatic switching high speed winding machine having a scroll cam type traverse mechanism, a freely rotatable turret, and a plurality of bobbin holders on the turret, the yarn is traversed by the traverse mechanism. In a synthetic fiber yarn winding method in which the yarn is wound around a bobbin attached to the bobbin holder while periodically varying the traverse speed (V) using a dastarvance mechanism, the yarn layer thickness of the package ( A method for winding a synthetic fiber yarn, characterized in that the traverse speed (V) is set so that the traverse speed (V) satisfies the formula [2] only when t) is within the range of the formula [1]. 0≦t≦0.0005D・・・・・・・・・・・・・・・
・[1](n-1)/2<(WL)/(2πRV)<n
/2・・・・・・・・・・・・・・・・・・［2］[t
: Package yarn layer thickness (mm), D: Yarn fineness (d)
, W: Winding speed (cm/min), π: Pi, R: Package radius (cm), V: Traverse speed (cm/min)
, L: traverse stroke (cm), n: any positive integer] (2) The method for winding synthetic fiber yarn according to claim 1, wherein the thick yarn having a fineness of 1000 deniers or more is wound at a winding speed of 2000 m/min or more.