JPS62244873A - Manufacturing method for polyester thread package - Google Patents

Abstract

PURPOSE:To enable to get excellent winding shape stability by using a winding tool where a self driving type contact roll and a multi-truck traverse are placed side by side and winding with a contact pressure of 0.2kg per package stroke of 1cm. CONSTITUTION:A bobbin axis 8 is driven, through a driving device 12, by the frequency control of an inverter 13 so that the peripheral speed of a package 1 which winds thread round the surface of a bobbin 7 may be fixed. On the other hand, a contact roll 6 is driven, through a driving device 10 and a transmitting device 9, by controlling the frequency of an inverter 11 so that it may accord with the peripheral speed of the package 1. And the traverse of thread is also reversed at the center side more than 2mm from the end in the bobbin axis direction of the package 1 by the multi-truck traverse so as to form a part harder than the end part and the thread is wound so that the contact pressure driving the winding may be below 0.2kg per package stroke of 1cm. In this way, the shape stability become excellent and knitted/woven goods to be gotten through dyeing with normal pressure and 110 deg.C has excellent and dyeing easy properties with high dignity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing polyester yarn packages. More specifically, the present invention relates to a method for producing a yarn package of polyester fibers that has good stability in winding shape and can be used directly to produce knitted fabrics of good quality.

[Problems that conventional technology and inventions attempt to solve] In recent years,
In the production of polyester fiber yarn, there is a strong demand for productivity improvement, and in the spinning process, especially in the spinning process, for example, 5
Attempts have been made to manufacture by the so-called high-speed spinning take-off method, which uses a high take-off speed of over 500 m/min. The polyester yarn obtained by this high-speed spinning and drawing method has a fine structure that is manufactured by two processes, a conventional spinning process and a drawing process (for example, in Japanese Patent Application Laid-Open No.
It is markedly different from spun/drawn yarn (as typified by Japanese Patent Publication No. 7-16913), and for this reason, spun/drawn yarn has outstanding useful features in terms of practically required performance. It is known from Publication No. 121613/1983.

The most outstanding features are that it has a high degree of dyeability and low heat shrinkage in practical terms. Easy dyeability is determined by the practical dyeing temperature obtained by dyeing general-purpose low-speed spun/drawn yarn at high temperature and high pressure.
It is excellent to the extent that it can be achieved at temperatures ranging from ℃ to normal pressure, especially at 6
JP-A-57-121613 discloses that the effect of yarn obtained by high-speed spinning using a take-up speed of 000 m/min or higher is remarkable.

In addition, low heat shrinkage can be achieved by, for example, processing steps that the gray fabric must undergo after weaving, typically scouring,
The dimensional change of the fabric during the dyeing process is extremely minimized,
As a result, it is possible to omit the presetting step that is performed prior to these wet processing steps.

However, contrary to the above-mentioned advantages, polyester yarn wound into a cheese-like package using the high-speed spinning take-off method is susceptible to minute gloss spots called sink marks on the fabric surface during the processing process when it is made into a fabric. There are drawbacks. Compared to spun/drawn yarns, yarns produced by high-speed spinning are more susceptible to the effects of stress rings because of their microstructural characteristics and the birefringence of the fibers that make up the yarns is lower.

Furthermore, the polyester fiber has low heat shrinkage,
Since the fabric is dyed at 110°C or normal pressure, the fabric has little heat shrinkage, making it extremely difficult to eliminate defects.

The cause of this "sink mark" defect during high-speed winding of the high-speed spinning take-up method is the heat generation, elongation, and
This is because the package is formed while the effects of stress rings such as compression become filamentous spots.

Thread unevenness is typified by heat shrinkage characteristics, and appears as "sink marks" when knitted fabrics are heat-treated at about 60° C. or higher.

Such thread spots tend to concentrate at both ends of the cheese-like package. This is because more yarn is stacked at both ends of the package in the bobbin axis direction as a result of traversing during package formation. This is thought to be due to the so-called high-edge shape, and this high-edge portion comes into contact with the contact roll of the winder.

For high-speed winding of 5,500 m/min or more, a winding machine of a bobbin shaft drive type is employed in which a bobbin shaft with a contact roll attached to the -m is directly driven. The winding mechanism of this bobbin shaft-driven winding machine winds a package formed by laminating yarn on a bobbin with good shape stability while pressing it with a contact roll.

At this time, all the power necessary to rotate the contact roll is transmitted through frictional contact between the package and the contact roll. (This type of contact roll drive method is called a "driven method".
) In order to perform high-speed winding with such a bobbin shaft-driven winder equipped with a driven type contact roll, a large amount of energy must be transmitted. As a result of the study, it became clear that it is difficult to maintain the normal shape. JP-A-56-127558 proposes winding by forming a bulge in the center of the package and keeping a contact roll in constant contact with the bulge during winding. /
During high-speed preparative winding, the ends of the package were not stacked properly, making it impossible to form a package. Japanese Patent Laid-Open No. 60-209013 mentions that it is difficult to eliminate yarn unevenness due to the attachment of contact rolls with conventional bobbin shaft-driven winding machines for producing cheese-like packages. As an alternative, they have proposed winding the package in a tapered shape without making contact with other objects during winding.

Therefore, a cheese-like package that is melt-spun and wound at a high speed of 5500 m/min or more without stretching,
It has good shape stability and does not cause sink marks even when the yarn is directly applied to knitted fabrics from the package and dyed at normal pressure to 110°C.
At present, a method for producing cheese-like packages using polyester fiber threads that does not cause defects has not yet been found.

The present invention provides easy dyeing,
Moreover, polyester yarn with low heat shrinkage has good shape stability, and even if it is directly applied to knitted fabrics and dyed at normal pressure to 110°C, it is a product of good quality that does not cause sink marks or defects. The purpose of this invention is to provide a method for producing a polyester yarn package that yields the following.

[Means for solving problems]

As a result of intensive studies to solve the above problems, the present inventors realized that the thread unevenness that causes "sink marks" is deeply related to the winding method of the cheese-like package and the shape of the puff cage. , discovered the fact that "sink marks" can be completely eliminated by making the yarn into a specific package shape, and solved the above problem.

That is, the object of the present invention is to process a melt-spun polyester yarn into a cheese-like package using a spindle-driven winding machine at a rate of 5500 m/min without drawing, using a self-driven contact roll, Winding is carried out using a winding machine equipped with a multi-track traverse that can reverse the traversing of the yarn in the bobbin axis direction of the package by 2w or more from the end to the center, thereby forming a part with higher hardness than the end. This is achieved by a method for manufacturing a polyester yarn package, which is characterized in that winding is performed with a contact pressure of 0.2 kg/package stroke 1 effi or less during winding.

The high-speed winding referred to in the present invention refers to a spinning/winding speed of 5.500.
A method for winding polyester yarn at a speed of m/min or more,
Typical examples include a spinning method that does not use a godet roll and a method that uses a godet roll to wind melt-spun polyester yarn onto a bobbin without substantially drawing it, as disclosed in JP-A-57-121613. Adapted.

Therefore, the yarn of the package obtained by the method of the present invention is untwisted and is distinguished from yarn that is untwisted by winding or the like.

The term "polyester" used in the present invention refers to polyesters represented by polyethylene terephthalate, polybutylene terephthalate, etc., but a small amount of other polyesters may be added as long as the easy dyeability and dimensional stability, which are the characteristics of the yarn of the present invention, are not impaired. It may also contain polymeric components, stabilizers, antistatic agents, and the like.

Polyester is melt-spun and stretched at a speed of 5.500 m/min or more (the polyester yarn wound by the method of the present invention has a birefringence of 0.08 to 0.14 and a crystalline perfection parameter of 0.50 or less). , it has a structural feature shown by a water conduction shrinkage rate of 5% or less.

If the birefringence index is 0.08 or less, the mechanical properties such as strength and elongation cannot be sufficient to allow the wound package to be directly used as a knitted fabric without going through post-processes such as stretching.

If the birefringence is 0.14 or more, the easy dyeability that is a characteristic of high-speed spun drawn yarn cannot be sufficiently obtained.

In addition, the crystal perfection parameter is an index indicating the structure of the crystal part measured by the method described later. The crystal perfection parameter of the polyester yarn obtained by winding of the present invention is 0.50 or less, and as a result, it has excellent low heat shrinkage with a fresh water shrinkage rate of 5% or less. .

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings showing one embodiment of the present invention.

The cheese-like package of polyester yarn obtained by the winding method of the present invention has a portion (hereinafter referred to as a convex portion) that is harder than the end portions from both ends of the package to the center side in the bobbin axis direction. ? The first feature is that Ji exists in several locations.

The convex portion is a bulge 5 that exists on a line along the bobbin axis direction of the package l, as illustrated in the cross-sectional view of the package in FIG. 1, and has a winding diameter slightly larger than other portions. The filaments are layered to look like this. The winding diameter difference Δh is preferably about 0.2 w to 3 w, from the viewpoint of winding shape stability, and more preferably about 0.2 w to 1 w.

The convex portion 5 exists on the center side in the bobbin axial direction from both ends 2 of the package 1, but at a position from both ends (the first
Figure:t,,1l=) is ``sink'' if it is 2 or more dragons.
It is preferable in terms of the elimination effect. In order to maintain good shape stability during and after high-speed winding, this position is set at 4 mm-1.
More preferably, it is 5as. The positions from both end portions 2 do not necessarily have to be the same on the left and right sides, but in consideration of ease of traversal, the same position (l+=lz) is usually adopted.

The convex portion 5 needs to be formed with higher hardness than both ends 2 (ear portions) of the package.

By making the hardness higher than that of both ends, it is possible to reduce the tension of the yarn at both ends 2 and promote the effect of relaxing the yarn at both ends after winding, thereby making it possible to eliminate "sink marks". .

The desired hardness difference between the edge of the package and the convex portion is 5°.
~20''.

The package obtained by the winding method of the present invention can be easily distinguished from conventional high-edge packages due to its unique hardness distribution in which the highest hardness portion exists in areas other than both ends in the axial direction of the bobbin.

For the purpose of improving shape stability, the convex portions are present in multiple locations on the center side of the package in the bobbin axis direction.Usually, considering the complexity of the traverse mechanism, there are two or three convex portions, preferably in two or three locations. There are two locations.

The above-mentioned unique winding shape is such that the packages are laminated in a constant manner from the beginning of winding to the end of winding.

As a result, it is possible to have extremely good winding shape stability even when winding a large amount of winding, not only several kilograms but also tens of kilograms.

In addition to the above-mentioned winding shape, the cheese-like package obtained by the winding method of the present invention has a dry heat shrinkage stress value difference of 3 between the yarn in the hard part and the yarn in other parts.
The second feature is that it is less than 0.sup./d.

As a result of various in-depth studies on the relationship between the occurrence of "sink mark" defects and the uneven thread quality of package yarns, the present inventors found that unevenness in the dry heat shrinkage stress value of package yarns in the yarn length direction was found to be It was found that this corresponds well to the occurrence of sink marks. As a result of further investigation, it was found that the yarn in the contact area between the package and the contact roll during winding tends to have a higher dry heat shrinkage stress value than the yarn in the non-contact area, and this stress value difference exists. If it is less than the value,
It was discovered that "sink marks" do not occur. The package obtained by the winding method of the present invention has a dry heat shrinkage stress value difference of 30 mg between the yarn in the high hardness part (convex part) and the yarn in other parts, as measured by the method described below. /d or less.

Desirably 20cm for the effect of further reducing "sink marks"
/d or less, more preferably 15 /d or less.

The selvage height package obtained by the conventional winding method has a dry heat shrinkage stress value difference of 40 m between the yarn at the selvage height part and other parts.
The advantage of the package of the present invention is clear from the fact that it cannot be lower than g/d.

Such heat shrinkage stress characteristics are satisfied from the beginning to the end of winding the package.

The winding method of the present invention will be described below.

The above-mentioned cheese-like package can be obtained stably and efficiently by winding the yarn using a bobbin shaft-driven winder equipped with a specific traverse mechanism and a self-driven contact roll. In other words, the method of providing a convex portion from both ends of the puff cage to the center side in the bobbin axis direction is described in Japanese Patent Publication No. 46-16298.
The multi-pedal traverse device disclosed in the above publication or the known cam traverse device reverses the traversal vibration of the yarn even inside the end in the axial direction of the bobbin of the package, making it harder than the end. This can be effectively achieved by employing a so-called multi-track traverse, which can form high sections. Considering the complexity of the traverse mechanism, the position of the convex portion, the ease of adjusting the amount of stacked yarn, etc., it is most preferable to adopt a multi-track traverse system using a cam.

The multi-track traverse is shown in Figure 2(a).

As exemplified in (b), the traverse is reversed not only at both ends but also at the center, and by designing the reversal position and reversal radius, a convex portion at a desired position and height can be provided. is possible. FIG. 2(a) shows an example of a two-track traverse, FIGS. 2(b) and (c) show an example of a three-track traverse, and FIG. 2(d) shows a conventional high-edge package other than the present invention. This is an example of a traverse.

A method of forming the convex portion closer to the center than the ends in the bobbin axial direction using this multi-trunk traverse as illustrated in FIG. 1 will be explained using the three-track example shown in FIG. 2(b). . The yarn to be traversed is stacked on the package at the end as yarn ■ and ■ in the first and second reversals, and then in the third reversal, it is stacked as yarn ■ toward the center from the end. Laminated. At this time, the radius at the time of inversion R,,R
,.

By selecting the ratio of R, the height of the convex portion formed closer to the center than the end can be adjusted.

The package of the present invention can be obtained if the number of tracks is 2 or more, but 2 to 4 is usually adopted.

The present invention provides the above-mentioned paper for the first time by winding a self-driven contact roll in combination with the above-mentioned traverse mechanism.
Winding of the cage is realized.

Depending on the combination of the conventional driven contact roll and the above-mentioned traverse mechanism, the package shape collapses during winding, making normal winding difficult.

FIG. 3 shows an embodiment showing the configuration of main parts of a winding machine used in the method of the present invention, in which a bobbin shaft 8 is connected to a bobbin shaft drive device
2, and furthermore, a bobbin shaft drive inverter 13
Accordingly, the pan cage 1 is driven while controlling the frequency so that the surface circumferential speed of the pan cage 1, which is wound on the surface of the bobbin 7 inserted into the bobbin shaft 8, is constant. The contact roll 6 is connected to a contact roll drive IO via a transmission 9, and a contact roll drive inverter 11 controls the frequency and frequency required for the rotation of the contact roll 6 to match the surface circumferential speed of the package 1. Drive power is supplied.

The drive inverter for the bobbin shaft and the drive inverter for the contact roll may be mutually adjustable mechanisms as shown in Japanese Patent Laid-Open No. 52-21438, but from the point of view of eliminating "sink marks" more completely, It is preferable that both drive inverters are controlled independently of each other so that the speed of the contact rolls can be controlled with high accuracy.

In this case, as a control method to gradually reduce the bobbin shaft rotation speed as the package winding diameter increases, the gradual reduction speed is set to 1.
- Tension control method that detects changes in the tension applied to the yarn and feeds it back to the bobbin shaft for control; Tension control method that detects changes in the circumferential speed of the contact roll or thread body using an optical sensor, etc. A circumferential speed control method that provides feedback to the shaft for control is adopted.

The contact roll drive 9 used in the winder of the method of the invention preferably uses a high speed three-phase induction motor. The connection method of this motor is not limited to the embodiment, and it may be directly connected to the shaft of the contact roll, or it may be built into the contact roll and implemented as an outer rotor type. Furthermore, it is also possible to use an air turbine drive instead of a motor.

The driving force supplied to drive the contact roll is determined by the circumferential speed of the contact roll measured with the contact roll not in contact with the bobbin shaft without winding, and the desired package circumferential speed (
When the winding speed) is the same speed as 100%, 75%~
If it is 125%, the purpose of the present invention can be sufficiently achieved.

Normally, 100% is adopted. (Hereinafter, 100% is shown unless specified.) However, the frequency should be set within a range of 0 to 10% above the calculated frequency corresponding to the set winding speed.

FIG. 4(a) is a schematic diagram showing the state of contact with a contact roll during winding up of the cheese-like package of the present invention. For comparison, FIG. 4(b) shows a contact state between a conventional high-edge package and a contact roll.

In the winding method of the present invention, the winding contact pressure when winding is performed by the winding machine is 0.2 kg/package stroke 1c11 or less, compared to the normally employed 0.3 kg/package stroke 1c11. It is necessary to take it. In order to further improve the quality, it is preferable to carry out the process at 0.15 kg/package stroke of 1 cm or less.

By adopting the self-driven contact roll of the present invention, it has become possible to wind with an even lower 0.1 kg/package stroke lea, and this low contact pressure has made it possible to achieve extremely good winding shape stability and eliminate "sink marks". - Conditions such as winding tension and edge angle are within the range used for normal winding.

By adopting the winding method of the present invention, shape stability can be achieved when winding easily dyeable and low heat shrinkable polyester fibers produced at high speeds of 5,500 m/minute or more without drawing after melt spinning. It has become possible to produce a cheese-like package that has good quality and can be directly dyed at normal pressure to 110°C without causing any "sink" defects. According to the findings of the present inventors, ■ Even during high-speed winding, the energy propagated through the contact portion between the package and the contact roll becomes minute, making it possible for the first time to form a package even if it is not at the height of the edge. (1) Multi-track traverse has made it possible to accurately and reproducibly determine the position, height, etc. of the convex portion to be formed inside the edge of the package.

■ It is assumed that this is achieved by enabling low contact pressure, minimizing the stress applied to the fibers at the contact area between the package and the contact roll, eliminating yarn unevenness, and eliminating "sink marks". be done.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples. In addition, in the examples, the evaluation method of each characteristic value used is as follows.

・Dry heat shrinkage stress value Thermal stress measuring device K E', - manufactured by Kanebo Engineering Co., Ltd.
Using type 2, the sample length is IQcm as a loop, and the initial load is 10.
After multiplying by mr/d, the temperature was raised at a heating rate of 150° C./min to draw a dry heat shrinkage stress curve. The maximum value of this curve (the value obtained by dividing the read value by the sample denier x 2) was taken as the dry heat shrinkage stress value (F*/d).

The difference in dry heat shrinkage stress value in the yarn length direction is
Be sure to measure the convex portion, and measure several points in one traverse (from one end to the other end) (for example, if the yarn length of the traverse is 1.5 m, 7 to 8 points) ) to measure the thermal stress value.

This measurement was carried out for 5 traverses. From the obtained measurement results, the average value of the dry heat shrinkage stress value of the convex part was set as 11 N/d, and among the measured values other than the convex part, the same number as the convex part was extracted from the smallest value. The average value was determined as v2/d.

The dry heat shrinkage stress value difference in the yarn length direction was determined using the following formula.

fti, heat loss 4U5 41M (AF) = F+ -Fz
(mg/d)・Hardness 1 Tsu) Using an IARDNESS TESTER, measure the hardness of each end and convex part of the package in the bobbin axis direction at positions divided into eight equal parts in the circumferential direction across the diameter of the package. did. Find the average value of n-8 for each,
The difference was defined as the hardness difference.

・Birefringence Δn Green light (wavelength 549
The refractive index nl+ parallel to the fiber axis and the refractive index n perpendicular to the fiber axis were measured using a micrometer (mμ), and the birefringence Δn=n+, −n was determined.

- Crystal Perfection Parameter C9 Using an X-ray diffractometer, a diffraction intensity curve from 7° to 35° was drawn under the following conditions, with the sample thickness of the raw thread being 0.5 tsuru.

30kV, 80mA, scanning speed 1”/min, chart speed 10m/min, time constant 1 second, receiving slit 0.3 Tsuru.

Three main reflections drawn in the range of 2θ-17° to 26° from the low angle side (100), (010), (I
T O ), the diffraction intensity curves between 2θ=7° and 35" are connected with a straight line and used as a baseline. A perpendicular line is drawn between each peak and the baseline, and this perpendicular line is used as the diffraction intensity.

The diffraction intensity at the point corresponding to the valley between (010) and (ITO) is set by 1°, and the diffraction intensity of the peak of (ITO) is
Then, the crystal perfection parameter CR is expressed by the following equation.

C5=□ - When the sample length under a load with a clean water shrinkage rate of 0.1 g/d is Lo, the load is removed and the length measured under the same load after being treated in spring water for 30 minutes is l. , the fresh water shrinkage rate is expressed by the following formula.

L.

・The dyeable polyester yarn is dyed with disperse dye Resolin Blue (Res).
olin Blue) FBL (trade name of Bayer), 3% owf, bath ratio l:50, 100
The dyeing rate was calculated by dyeing at 120° C. for 120 minutes and measuring the absorbance of the dye solution after dyeing. When the dyeing rate is 60% or more, the dyeing property is good, and when the dyeing rate is 70% or more, dyeing is possible under normal pressure, which is extremely good.

- The display defect level of weft "sink mark" was divided into four levels, and W = 0 to 1 were considered to be acceptable.

W=0: No sink mark at all, W-1: Very slight sink mark W! 2: There is a sink mark, W-3: There is a strong sink mark. Focuses and lubricates the filament,
7500 as 75'/36' yarn without drawing
Winding with a winding machine at a speed of m/min, winding + iL Okg
A cheesy puff cage was obtained. The physical properties of the yarn were as shown in the table below.

When winding, a spindle-driven winding machine equipped with a self-driven contact roll shown in Fig. 3 is used, and the winding machine shown in Fig. 2 (b) is used.
A winding machine equipped with a three-tract traverse type cam traverse as shown in Fig. 1 was used. Yarn by traverse■,■,
The inversion radius (R) of ■ is R1, R* -2 for filamentous ■, ■.
Packages were obtained by setting the 0m-yarn ■ to Rs=15 mm, and varying the intervals between the yarns ■ and the reversal position of the yarn ■ and the yarn ■ as shown in Table 1. For comparison, winding was performed using the conventional one-track traverse shown in FIG. 2(d).

In this example, the following conditions were used, except that the winding contact pressure was 0.15 kg/package stroke 1 alI.

Bobbin outer diameter: 140°C mφ Traverse stroke: 160 Tornado take-up tension: 0.25 g/d Winding winding angle: 6° Self-driving contact roll control method; Peripheral speed control method〃 Drive crab 100% Next, these packages Then, the entire amount of yarn was directly fed to an 8-product water jet loom (LW-51 type) for weaving, with a warp density of 100 yarns/in and a weft density of 80 yarns/in.
It was made into a plain woven fabric with a standard of I.N. After scouring this plain woven fabric, it was dyed at 100° C. without presetting, and the quality of weft "sink marks" was determined.

Table 1 shows the shape stability when winding the cheese-like package, the shape characteristics of the 10ksr package, the difference in heat shrinkage stress value (ΔF) of the surface layer portion, and the corresponding fabric quality.

As is clear from Table 1 below, the cheese-like package obtained by the winding method of the present invention has good winding stability and can be used directly on the weft of a fabric under normal pressure. It was possible to obtain excellent dyeability and good quality by dyeing.

Comparison■ In the same spinning and winding as in Example 1, a spindle-driven winder equipped with a conventional driven contact roll that does not have self-driving force was used, but the multi-track traverse used in Example 1 was also installed. I tried winding it using a winder.

I tried winding two types of traverse reversal position intervals, 3rd and 5th dragons, but the shape collapsed from the start of winding when about 0.5 kg of yarn was piled up, so I had to wind it up! It was difficult to continue.

Next, using a winding machine that combines this driven contact roll with the conventional traverse mechanism shown in FIG. I got it. However, the dry heat shrinkage stress value variation (ΔF) of this package was as large as 60 μ/d (and the quality of the fabric was extremely poor with a weft sink JW=3).

The same procedure as in Example 1 was carried out except that the inversion position of the traverse was changed to the conditions of positive (■), and the winding was carried out under the conditions shown in Table 2 to improve shape stability and dyeing at 100°C. We investigated the occurrence of "sink marks" caused by

Table 12 According to the present invention, winding was possible even at a low contact pressure of 0.2 kg/package stroke lcIm or less, and further 0.15 kg/puff cage stroke lea or less, and a fabric of extremely good quality was obtained.

! Application ±1 Polyethylene terephthalate with an intrinsic viscosity [η) = 0.61 was melt-spun at 295°C, and after cooling, it was spun with a pair of unheated godet rolls at the same circumferential speed, without stretching, at 75'/ A 36' yarn was wound at the speed shown in Table 3 to obtain a cheese-like package with a winding weight of 12 kg.

For winding, a winder equipped with a self-driven contact roll shown in FIG. 3 and a two-track traverse type cam traverse shown in FIG. 2(d) was used. The reversal radius of the yarn (■, ■) by traverse is R1 = 40 m for the yarn ■.
, the yarn ■ was set to R2-15 fin, and the interval between the reversal positions was set to 4. Other conditions were the same as in Example 1 to obtain a package.

The position of the convex portion of the obtained cheese-like package from the end was 4 m (L"lx) in each case, and the shape stability during winding was also good.

The physical properties of the obtained yarn, the shape of the 12 kg package, the dry heat shrinkage stress value difference (ΔF) of the surface layer, and the weft "sink mark" of the fabric after dyeing at 100°C obtained in the same manner as in Example 1. The quality is shown in Table 3.

'7j! As is clear from Table J3, the cheese-like package obtained by the winding method of the present invention has good winding shape stability and has good dyeing properties when used directly on the weft of a fabric and dyed under normal pressure. It had a high quality appearance with no sink marks.

Blank space below [Effects of the Invention] Since the method for producing a yarn package according to the present invention is configured as described above, the cheese-like package of thermoplastic synthetic fibers obtained by the winding method has good shape stability. And the yarn can be used directly for knitting and weaving under normal pressure to 110
The knitted fabric obtained by dyeing at ℃ can be of good quality and easy to dye.

Particularly, special effects are exhibited when used as the warp and weft of textiles.

The winding method of the present invention has a winding speed of 6000 m/min, particularly 7
Even more remarkable effects are exhibited at high speeds of 000 m/min or higher.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of the shape of a cheese-like package obtained by the winding method of the present invention, and FIG. 2 is a schematic diagram showing the reversal trajectory of the yarn due to traverse. 4 is a perspective view showing the mechanism of a winding machine equipped with a self-driven contact roll, and FIG. 4 shows the state of contact between the contact roll and the package during winding of the package. 1: Cheese-like package; 2: Package end. Part 3: Trajectory of yarn reversal;
4: Fiber, 5: Convex portion, 6: Contact roll, 7: Bobbin, lO: Contact roll drive device, 12: Bobbin shaft drive device.

Claims (1)

[Claims] 1. When winding melt-spun polyester yarn into a cheese-like package using a spindle-driven winding machine at a speed of 5500 m/min or more without drawing, a self-driven contact roll and a yarn Winding is carried out using a winding machine equipped with a multi-track traverse that can reverse the traversing of the strip in the bobbin axis direction of the package by 2 mm or more toward the center from the end to form a part with higher hardness than the end. The contact pressure inside is 0.
A method for manufacturing a polyester yarn package, characterized in that winding is performed at a rate of 2 kg/package stroke of 1 cm or less. 2. The polyester yarn package according to claim 1, wherein the self-driven contact roll circumferential speed control mechanism and the bobbin shaft circumferential speed control mechanism use winders independent of each other. Production method.