JPH0157029B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a method for winding polyester filament, which allows a knitted fabric of good quality to be obtained even when the filament is directly applied to a knitted fabric. [Prior art] In recent years, there has been a strong demand for improved productivity in the production of polyester filament, and the spinning process,
In particular, in the spinning process, attempts have been made to manufacture by the so-called high-speed spinning take-off method, which uses a take-off speed as high as, for example, over 5500 m/min. The polyester filament obtained by this type of high-speed spinning take-off method has a fine structure that can be manufactured by two processes: a conventional spinning process and a drawing process (for example, as typified by Japanese Patent Application Laid-Open No. 16913/1983). It is markedly different from spun/drawn yarn, and therefore, according to Japanese Patent Laid-Open No. 121613/1983, etc., spun/drawn yarn has outstanding and useful features in terms of practically required performance. Are known. The most outstanding features are that it has a high degree of dyeability and low heat shrinkage in practical terms. Easy dyeability is excellent to the extent that the practical dyeing temperature obtained by high-temperature, high-pressure dyeing of general-purpose low-speed spun/drawn yarn can be achieved at 110℃ to normal pressure, especially when a take-up speed of 6000 m/min or more is used. When it comes to filaments obtained by high-speed spinning, it was reported in Japanese Patent Application Laid-Open No. 57-1981 that the effect is remarkable.
-Disclosed in Publication No. 121613. 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 the polyester filament wound as a cheese-like package by the high-speed spinning take-off method is made into a fabric, the innermost layer of the package, the part of the filament laminated on the bobbin whose thickness is less than 1 mm. Short, white streak-like defects called ``sticks'' occur on the gray fabric, and minute gloss spots on the fabric surface called ``sink marks'' also occur during the processing process. Fabrics having these defects have extremely low commercial value, so eliminating these defects is an important issue. For high-speed winding of 5500 m/min or higher, generally a bobbin shaft-driven winding machine is used, which directly drives a bobbin shaft equipped with a contact roll. 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 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 system is called a "driven system.") When filament is wound up using a winder that has such a driven type contact roll, the filament is stacked on the bobbin to some extent. , since the cheese-like package has the effect of cushioning,
"Flash" defects and "sink marks" do not occur, but when the filament is extremely thinly laminated on the bobbin, the contact between the filament and the roll can be caused by vibrations of the winder or minute irregularities on the surface of the bobbin. When the filaments come into contact with each other, they are subjected to stress such as compression, elongation, and heat generation, resulting in thread unevenness and "stiffness".
It has become clear that there are shortcomings and "sink marks". Japanese Patent Application Laid-Open No. 60-2091013 discloses 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 contact rolls. As an alternative, it is proposed that the package be wound in a tapered pattern without coming into contact with other objects during winding. Therefore, when a cheese-like package is melt-spun and wound at a high speed of 5500 m/min or more, and the filament is directly applied to a knitted fabric from the package,
At present, no method has been found for producing polyester filament that does not cause "edge" defects or "sink mark" defects in areas where the thickness of the filament layered on the bobbin is 1 mm or less. [Problems to be Solved by the Invention] The object of the present invention is to use a high-speed spinning and winding method to directly knit fabrics using polyester filaments, but the thickness of the filaments stacked on the bobbin is approximately 1 mm. It is an object of the present invention to provide a method for winding polyester filament, which allows obtaining a knitted fabric of good quality that does not produce "stick" defects or "sink marks" defects in the areas within the range. [Means for Solving the Problems] The present invention provides a winder having a self-driven contact roll when winding melt-spun polyester filament into a cheese-like package using a spindle-driven winder at a speed of 5500 m/min or more. This is a method for winding polyester filament, which is characterized in that winding is carried out using a machine, and at the start of winding, the distance between the contact roll and the bobbin is between 50 μm and 400 μm. The winding method of the present invention requires that the distance between the bobbin and the contact roll be 50 μm or more and 400 μm or less. By setting the distance between the bobbin and the contact roll to 50 μm or more, it is possible to prevent instantaneous contact between the filament wound on the bobbin and the contact roll. If the distance between the bobbin and the contact roll is less than 50 μm, the filament wound around the bobbin will momentarily come into contact with the contact roll due to the vibration of the winding machine or minute irregularities on the bobbin, and that part will be fabricated. When this occurs, it becomes a ``stick'' defect or a ``sink'' defect. On the other hand, if a gap of more than 400 μm is provided between the bobbin and the contact roll, the filament will remain inside the designed traverse reversal position until the filament is stacked on the bobbin and comes into contact with the contact roll. trying to enter. As a result, fluctuations in winding tension occur, resulting in thread unevenness. In addition, the speed fluctuation of the contact roll becomes large, and thread unevenness occurs. If the distance between the bobbin and the contact roll is 400 μm or less, yarn unevenness that causes defects in knitted fabrics will not occur. The winding method of the present invention, in which a certain distance is provided between the bobbin and the contact roll, is achieved for the first time by a winder having a self-driven contact roll. When winding is performed using a driven contact roll with the time specified in the present invention, power is not transmitted from the bobbin to the contact roll at the start of winding, so the speed of the driven contact roll is Fluctuations increase significantly and filamentous mottling becomes noticeable, so that the object of the present invention is not achieved. In the present invention, if the self-driven contact roll is used, it is not necessary to receive almost all the power necessary for rotating the contact roll from the bobbin shaft, so that it is possible to stably wind a homogeneous filament. FIG. 1 shows one embodiment showing the configuration of main parts 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 further, a bobbin shaft drive inverter 7 allows The package 2 is driven while controlling the frequency so that the surface peripheral speed of the package 2 wound on the surface of the bobbin 3 inserted into the bobbin shaft 5 is constant. The contact roll 4 is connected to a contact roll drive 9 via a transmission 8, and a contact roll drive inverter 10 adjusts the frequency and frequency required for the rotation of the contact roll 4 to match the surface circumferential speed of the package 2. Drive power is supplied. The drive inverter of the bobbin shaft and the drive inverter of the contact roll may be a mutually adjustable mechanism as shown in Japanese Patent Application Laid-Open No. 52-21438, but the "edge" and "sink" defects can be improved. In order to completely eliminate this problem, 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, as a control method to gradually reduce the bobbin shaft rotation speed as the winding diameter of the package increases, a method is used in which the gradual reduction speed is stored in a computer and controlled.
Tension control method detects changes in the tension on the filament and feeds it back to the bobbin shaft for control. Circumferential speed control detects changes in the circumferential speed of the contact roll or thread body using an optical sensor, etc. and controls it by feeding it back to the bobbin shaft. method etc. will be 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 without winding and in a non-contact state with the bobbin shaft, and the desired circumferential speed of the package (winding speed) is the same speed
If the ratio is 95% to 125%, the object of the present invention can be sufficiently achieved. Usually 100% is accepted. (Hereinafter, 100% is shown unless specified.) However, regarding the frequency, 0 to 10% is calculated based on the set winding speed.
It should be set within a range exceeding %. 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 provided with an acceleration ring that is normally used, contact between the part of the bobbin where the filaments are stacked 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 setting method between the bobbin shaft and the contact roll is as follows:
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. The high-speed winding referred to in the present invention means that the spinning/winding speed is
It is a device that winds polyester filament at a speed of 5500 m/min or more, and is typically JP-A-57-121613.
The present invention is applicable to a spinning take-off method that does not use a godet roll and a method that uses a godet roll to wind melt-spun polyester filament onto a bobbin without substantially stretching it, as disclosed in the above publication. Therefore, the filament of the package obtained by the method of the present invention is a non-twisted filament, which is distinguished from a filament 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. 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, 5500m/
When winding polyester filament that is manufactured at a high speed of more than 10 minutes, it is possible to produce a filament that can be used directly to knit fabrics without causing "stick" defects or "sink mark" defects and yield knitted fabrics of good quality. . [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. Speed fluctuation rate of the contact roll: The circumferential speed of the contact roll is detected and recorded from the start of winding until the filament is stacked on the bobbin by approximately 5 mm using the circumferential speed control device that controls the drive of the bobbin shaft using the circumferential speed of the contact roll. Record it on the meter. Obtain each value of the following equation from the records to obtain the speed fluctuation rate. The speed fluctuation rate at which no defects occur is 0.25% or less. Speed fluctuation rate (%) = maximum detected speed (m/min) - minimum detected speed (m/min)/set speed (m/min)
×100 "Fushi"defect; Weave the filament layered on the bobbin to a thickness of 1 mm, count the number of "fushi" defects that occur on the plain weave fabric, and pass ◎~○. . ◎: Very good (number of edges: 0) ○: Good (number of edges: 1 to 2) ×: Poor (number of edges: 3 or more) Weft "sink mark"defect; Plain woven fabric evaluated for "edges" defect is refined , After dyeing, we classify the "sink marks" into four levels of defects,
W=0 to 1 is considered to be a pass. W=0: No sink marks at all W=1: Extremely small sink marks W=2: Some sink marks W=3: Strong sink marks Example 1 Polyethylene terephthalate with intrinsic viscosity [η] = 0.61 was melt spun at a spinning temperature of 305°C. ^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 distance between the bobbin and the contact roll being changed 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: 140mmφ Traverse stroke: 160mm Winding tension: 0.25g/d Winding winding angle: 6° Self-driven contact roll control method: Peripheral speed control method Self-driven contact roll driving force: 100% Next, The filaments laminated to a thickness of less than 1 mm from the bobbin of the obtained package cage were directly fed to a Nissan water jet loom (model LW-51) for weaving, with a warp density of 100 filaments/inch and a weft density of 80.
As a standard plain woven fabric with a book/inch standard, the "edge" defect and "sink mark" defect were evaluated. Table 1 shows the speed fluctuation rate of the contact roll during winding under various conditions and the evaluation results of the plain woven fabric woven from the obtained filaments.

[Table] Examples of the present invention are Experiment Nos. 3, 4, 5, and 6, and the fabrics obtained in these examples did not have "sticky" defects and the quality of the dyed fabrics was good. . Comparative Example 1 A winding machine equipped with a driven contact roll that does not have self-drive, the distance between the bobbin and the contact roll is 100μ.
Winding was carried out under the same conditions as in Example 1, except that the winding was changed to m, to obtain a 5 kg cheese-like package, which was then woven 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%, which caused "sticks" on the fabric.
Although no defects occurred, the weft "sink mark" was extremely poor at W=3. Example 2 The distance between the bobbin and the contact roll is 100μm,
Example 1 except that the winding speed was changed as shown in Table 2.
Winding was carried out under the same conditions as in Example 1 to obtain a 5 kg cheese-like package, which was then made into a fabric in the same manner as in Example 1. The results are shown in Table 2. As is clear from Table 2, when the filament obtained by the winding method of the present invention was directly used as a weft to make a woven fabric,
It had a high quality product with no "edge" defects or weft "sink marks".

〔Effect of the invention〕

According to the winding method of the present invention, in winding polyester filament manufactured at a high speed of 5500 m/min or more, the filament laminated on the bobbin of the innermost layer of the cheese-like package obtained even when directly applied to the knitting fabric. It is possible to produce a filament that yields a knitted fabric of good quality that does not produce "stick" defects or "sink mark" defects in areas with a thickness of 1 mm or less. In particular, the present invention is particularly effective when the filament is 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 paper tube will be damaged by the impact caused by the contact between the bobbin and the contact roll at the start of winding or automatic switching. Although troubles such as bursting sometimes occur, according to the winding method of the present invention, there is no bursting of the paper tube, and it is possible to wind up the paper tube without any trouble.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the mechanism of a winder equipped with a self-driven contact roll, and Fig. 2 shows a state in which winding of the filament has started with a gap between the bobbin and the contact roll. FIG. 1: filament, 2: cheese-like package,
3: bobbin, 4: contact roll, 5: bobbin shaft,
6: Bobbin shaft drive device, 7: Bobbin shaft drive inverter, 8: Transmission device, 9: Contact roll drive device, 10: Contact roll drive inverter, 11:
Contact roll vertical slide shaft, 12: Spacer.

Claims (1)

[Claims] 1 Melt-spun polyester filament
When winding a cheese-like package using a spindle-driven winder at a speed of 5,500 m/min or more, a winder with a self-driven contact roll is used, and the distance between the contact roll and the bobbin is 50μ at the start of winding.
A method for winding polyester filament, which comprises winding the filament at a length between m and 400 μm.