JPH01192671A - Winding method for polyester filament - Google Patents

Abstract

PURPOSE:To improve the quality of a filament, by a method wherein a gap is formed between a self-drive type contact roll and a bobbin, a winding speed is held at a specified value until winding of a line of yarn is progressed and the line of yarn is brought into contact with the roll, and the number of rotation of a bobbin is controlled according to a winding size. CONSTITUTION:A shaft 5 of a bobbin 3 is coupled to a drive device 6, and is driven by an inverter 7 as frequency is controlled so that the surface speed of a package 2 wound around the surface of the bobbin 3 is adjusted to a specified value. A control roll 4 situated with a specified gap between the contact roll and the bobbin 3 is coupled to a drive device 9 through a transmission device 8. Frequency and a drive force necessary to rotation of the contact roll 4 coinciding with the surface peripheral speed of the package 2 are provided by an inverter 10. This constitution prevents production of a node and a sink mark on a filament, and also prevents rupture of the bobbin (sheet pipe) 3 during the starting of winding.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides a method for winding polyester filaments by spinning at a high speed of 5000 m/min or more, which can yield knitted fabrics of good quality even when directly applied to knitted fabrics. It is related to.

[Conventional technology]

In recent years, there has been a strong demand for improved productivity in the production of polyester filaments, and production using the so-called high-speed spinning draw method, which uses high take-off speeds of over 5000 m/min, has become popular in the spinning process, especially in the spinning process. It's starting to be tried.

Polyester filaments obtained by this type of high-speed spinning take-off method have a fine structure that is manufactured by two processes: a conventional spinning process and a drawing process (Japanese Patent Laid-Open No. 57-1
No. 6913) It is markedly different from spun/drawn yarn and has outstandingly useful characteristics (Japanese Patent Laid-Open No. 57-12).
No. 1613) is known.

The most outstanding features are that it has a high degree of dyeability and low heat shrinkage in practical use. Easy-dyeing dyeing is excellent in that it can achieve the practical dyeing temperature obtained by high-temperature, high-pressure dyeing of general-purpose slow-spun/drawn yarn at normal pressure to 110°C.
For example, JP-A-57-121613 discloses that filaments obtained by high-speed spinning using a take-up speed of 1,000 m/min or more have remarkable effects.

In addition, low heat shrinkage means that, for example, in textiles, dimensional changes in textiles are extremely minimized during the processing steps that the gray fabric must undergo after weaving, typically during scouring and dyeing processes. 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 advantages, when polyester filaments wound into a cheese-like package by the high-speed spinning take-off method are made into a fabric, the innermost layer of the package, the part where the thickness of the filaments laminated on the bobbin is within 1 wII, Short, white, streak-like defects called "sink marks" occur on the gray fabric, and minute gloss spots on the fabric surface called "sink marks" occur during the processing process. Since textiles having these defects have a reduced commercial value, it has been an important issue to eliminate these defects.

In high-speed winding of 5000 m/min or more, a winding machine of a bobbin shaft drive type that directly drives a bobbin shaft equipped with a contact roll is generally employed.

The winding mechanism of this bobbin shaft-driven winding machine winds up a package formed by laminating filaments on a bobbin with good shape stability while pressing it with a contact roll. At this time, all of the power necessary to rotate the contact roll is transmitted through frictional contact between the puff cage and the contact roll. Such a contact roll driving method is called a driven method.

Using a winder with such a driven contact roll,
When the filament is wound up, the filament is laminated on the bobbin to a certain extent, and the cheese-like package has a cushioning effect, so "blind" and "sink" defects do not occur, but the filament is laminated extremely thinly on the bobbin. In this state, the filament and the contact roll come into instantaneous and strong contact with each other due to the vibration of the winding machine and minute irregularities on the bobbin surface, and the filament is subjected to stress such as compression, elongation, and heat generation, resulting in yarn unevenness. Occurs, "Fushi" defects and "
Sink marks are a drawback.

Japanese Patent Application Laid-Open No. 60-2091013 states that it is difficult to eliminate yarn unevenness with a conventional bobbin shaft-driven winding machine for producing cheese-like packages because of the attachment of a contact roll. As a representative example, it is proposed that the package be wound in a tapered burn shape without coming into contact with other objects during winding.

In addition, if the gap between the bobbin shaft and the self-driven contact roll is relatively small, within 200 μm, at the start of winding, vibration due to the primary resonance point of the bobbin shaft, which is likely to occur at the start of winding.
Alternatively, there was a problem with the manufacturing accuracy of the bobbin itself. Also,
In order to solve the above problem, the gap is set to 300 μm or more, for example, and the rotation speed of the contact roll is detected by a sensor during normal winding after the gap is filled with the winding yarn, and the bobbin shaft is adjusted so that this becomes constant. A method of controlling the rotation speed is adopted. However, when winding is performed with the gap set to 300 μm or more, power is not transmitted from the bobbin to the contact roll at the start of winding, so the speed fluctuation of the driven contact roll increases significantly. As a result, thread unevenness occurred in the thread until it filled the gap.

[Problem that the invention seeks to solve]

The present invention is a polyester filament manufactured by a high-speed spinning and winding method, which does not cause "sticky" defects or "sink marks" even in the portion of the filament that is laminated on a bobbin and has a thickness of about 1 m or less. It is an object of the present invention to provide a method for winding polyester filaments that yields a good quality knitted fabric.

[Means for solving problems]

The present invention uses melt-spun polyester filaments of 5
When winding a cheese-like package using a spindle-driven winder at a speed of 900 m/min or more, a winder with a self-driven contact roll is used, and a gap is created between the contact roll and the bobbin at the beginning of winding. The polyester is characterized in that the bobbin shaft rotational speed is controlled to be gradually decreased according to an increase in the winding diameter so that the winding speed is kept constant until the filament fills the gap and starts contacting the roll. This is a method of winding filament.

The winding method of the present invention requires a gap C (FIG. 2) between the contact roll and the bobbin.

There is no particular limitation on this gap, but it is between 400 and 300.
It is desirable that the thickness is 0 μm, more preferably 500 to 1500 μm. If the gap is larger than 3,000 μm, it is not preferable because threads are likely to fall off at the edge of the cheese. In the method of the present invention, the number of rotations of the bobbin shaft is gradually decreased in accordance with the increase in the winding diameter so that the winding speed is kept constant until the filament fills the gap and starts contacting the roll. This is extremely important. With this control, even if a gap is provided where the bobbin and the contact roll do not come into contact at all, it is possible to completely control the "streak" defect caused by the increased denier of the wound yarn. The time required for this control is calculated from the size of the gap and the set denier of the wound yarn, and can be incorporated into the control system in advance. Furthermore, although it is essential to use a self-driven contact roll in the method of the present invention, with this roll there is no need to receive much of the power required to rotate the contact roll from the bobbin shaft, so a homogeneous filament can be wound stably. It becomes possible to take it. FIG. 1 shows an embodiment showing the mechanism of a winding machine used in the method of the present invention, in which a bobbin shaft 5 is connected to a bobbin shaft drive device 6, and a bobbin shaft drive inverter 7 drives the bobbin shaft 5. The package 2 is driven while controlling the frequency so that the surface speed of the package 2 wound on the surface of the bobbin 3 attached to the bobbin 3 is constant. Contact roll 4
is connected to a contact roll drive device 9 via a transmission device 8, and furthermore, by a contact roll drive inverter IO,
The frequency and driving force necessary for rotation of the contact roll 4 matching the surface peripheral speed of the package 2 are supplied.

The drive inverter of the bobbin shaft and the drive impark of the contact roll may be mutually adjustable mechanisms as shown in Japanese Patent Application Laid-Open No. 52-21438. In order to eliminate the problem more completely, it is preferable to use a mechanism in which the speed of the contact rolls is controlled with high accuracy, and both drive inverters are controlled independently from each other. In this case, a peripheral speed control method is adopted in which changes in the peripheral speed of the contact roll or the wound body are detected by an optical sensor or the like and controlled by feeding back to the bobbin shaft.

In the method of the invention, the contact roll drive device 9 used in the winder preferably uses a high speed three-phase induction motor.

The connection method of this motor is not limited to the description of the embodiments, 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 circumferential speed of the pan cage (winding speed). is the same speed as 100
%, if it is 95 to 105%, the object 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 that is 10% higher than O relative to the calculated frequency that corresponds to the set winding speed.

FIG. 2 is a schematic diagram showing a state in which winding of the filament 1 is started with a gap C provided between the bobbin 3 and the contact roll 4.

The bobbin and the contact roll must be in a state of complete non-contact; if even a portion of the bobbin and the contact roll come into contact, it will affect the drive of the bobbin shaft of the winder and cause yarn unevenness. For example, if the contact roll is equipped with an acceleration ring that is normally used, contact between the part of the bobbin where the filaments are laminated and the contact roll can be avoided, but part of the bobbin comes into contact with the acceleration ring, which drives the bobbin shaft. As a result, the filamentous spots will not be resolved.

The method of setting the gap between the bobbin shaft and the contact roll is, for example,
This can be done by inserting spacers into the slide shafts of the upper and lower heads to which the contact rolls are attached.

High-speed winding in the present invention refers to a spinning/winding speed of 5000 m.
A method for winding polyester filaments at a speed of 1/min or more, typically using a spinning take-off method that does not use a godet roll as disclosed in Japanese Patent Application Laid-open No. 57-121613, etc., or a method for winding polyester filaments that has been melt spun using a godet roll. It is adapted to a method of winding onto a bobbin without substantially stretching. Therefore, the filament of the package obtained by the method of the present invention is untwisted.
It is distinguished from those that have unraveling 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.

Conditions such as winding tension and winding angle are within the range adopted for normal winding.

By adopting the winding method of the present invention, when winding polyester filament manufactured at a high speed of 5,000 m/min or more, it is possible to obtain good results without causing "stick" defects or "sink mark" defects even when directly applied to knitted fabrics. It becomes possible to manufacture filaments that can stably produce high-quality knitted fabrics.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples. In addition, each evaluation of Examples is based on the following method.

"Flash"defect; Weave the filament of the part laminated one stitch thick on the bobbin, count the number of "flash" defects that occur on the obtained plain woven fabric, and consider ◎ to ○ as a pass.

◎: Very good (number of edges: 0) ○: Good (number of edges: 1 to 2) ×: Bad (number of edges: 3 or more) Frequency of occurrence of "edges": Laminated part with a thickness of l■ on the bobbin The number of occurrences of inferior products due to "stick" defects when the resulting plain woven fabric was scoured, dyed, and inspected for 200 squares is shown as a percentage.

Weft "sink mark"defect; After dyeing, the plain fabric evaluated for "edge" defect is classified into four levels of weft "sink mark" defect level, and W=O to l are considered to be passed.

W=Q: No sink marks at all W=1=Extremely small sink marks W=2: Sink marks W=3=Strong sink marks "streak" defect The number and strength of "streak" defects that occurred on the gray fabric of the plain woven fabric were counted, and O was determined to be a pass.

Q: Good product (A grade) ×: Defective product (B grade) ××: Defective product (C grade) Example 1 Polyethylene terephthalate with intrinsic viscosity [η) = 0.61 was melted at a spinning temperature of 305°C. Spun, 75d/36f
A multifilament of 5 kg was obtained as a cheese-like package.

Winding was carried out using a spindle-driven winder equipped with a self-driven contact roll as shown in FIG. 1, with the gap between the bobbin and the contact roll being varied as shown in Table 1. In this example, the following conditions were used except that the winding speed was 7000 m/min.

Bobbin outer diameter: 140 flφ Traverse stroke: 160 Crane Winding tension: 2.25 g/d Winding edge angle 26 @ Control method of self-driven contact roll: Peripheral speed control method 100% drive crab of self-driven contact roll The filaments laminated to a thickness of lfi from the package bobbin were directly fed to an 8-product water jet loom (LW-51 type) for weaving. As a standard plain woven fabric,
Evaluations were made for "sticky" defects and "sink marks" defects.

Table 1 shows the evaluation results of plain woven fabrics woven from filaments obtained under various conditions.

The bobbin shaft rotation speed control shown in Table 1 means increasing the bobbin shaft rotation speed by increasing the winding diameter so that the winding speed is kept constant until the yarn fills the gap between the bobbin and the contact roll. means a method of controlling in advance so as to gradually reduce the amount according to the amount.

In the present invention, the test 1lkL was 4.5, and the fabrics obtained in these examples had almost no "sticky" defects and were of good quality in all other respects. Also, experiment number 1.2.3.6
indicates a comparison.

Comparative Example 1 Winding was carried out under the same conditions as in Example 1, except that the gap between the bobbin and the contact roll was set to 300 μm using a winder equipped with a driven contact roll that does not have self-drive, and a 5 kg roll was obtained. After obtaining the cheese-like package, it was made into a fabric in the same manner as in Example 1. As a result, the rate of speed fluctuation of the contact roll was as large as 1.12% (the fabric did not have any "edge" defects, but the weft "sink" was extremely poor at W=3).

〔Effect of the invention〕

According to the winding method of the present invention, in winding polyester filament produced at a high speed of 5000 m/min or more, cheese-like packages obtained even when directly applied to knitted fabrics,
The thickness of the filament laminated on the innermost bobbin is 1
It is possible to produce filaments that yield knitted fabrics of good quality that do not have "stick" defects, "sink marks" or "streak" defects in areas within m.

In particular, the present invention is particularly effective when the filaments are used as the warp and weft of textiles.

In addition, if a paper tube is used as the bobbin and winding is performed without a gap between the bobbin and the contact roll, the impact caused by the contact between the bobbin and the contact roll at the start of winding or automatic switching may cause the paper tube to However, according to the winding method of the present invention, there is no rupture of the paper tube, and it is possible to wind the paper tube without any trouble.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the mechanism of a winding machine equipped with a self-driven contact roll, and Fig. 2 shows a state in which there is a gap between the bobbin and the contact roll 1, and a state in which filament winding has started. FIG. 1: Filament 2: Cheese-like package 3: Bobbin 4: Contact roll 5: Bobbin shaft 6: Bobbin shaft drive device 7: Bobbin shaft fooling inverter 8: Transmission device 9: Contact roll drive device 10: Contact roll fooling inverter 11 : Contact roll vertical slide shaft 12 varnish spacer Patent applicant Asahi Kasei Corporation

Claims (1)

[Claims] Melt spun polyester filament 5000m/
When winding a cheese-like package with a spindle-driven winder for more than 1 minute, a winder with a self-driven contact roll is used, and a gap is provided between the contact roll and the bobbin at the beginning of winding. , a polyester filament characterized in that the number of rotations of the bobbin shaft is controlled to be gradually decreased as the winding diameter increases so as to keep the winding speed constant until the yarn fills the gap and starts contacting the roll. Winding method