JPH072567B2 - Thread cheese package and winding method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cheese-like package of thermoplastic synthetic fiber yarn. More specifically, the present invention relates to a cheese-like package of thermoplastic synthetic fiber yarn, which has good shape stability and is capable of directly providing a yarn from a package to a knitted fabric to obtain an excellent-quality uneven fabric.

[Problems to be solved by conventional technology and invention]

In recent years, there has been a strong demand for improved productivity in the production of thermoplastic synthetic fibers, and spinning speeds exceeding 4000 m / min
A high-speed spin draw method in which stretching-winding is continuously carried out (for example, JP-A-57-16913), and a high-speed spinning take-up method using a high take-up speed exceeding 4000 m / min in the spinning process (for example, , JP-A-57-143514, JP-A-58-2084
Manufacturing has started to be attempted using the No. 16 bulletin).

However, in order to fully utilize the above advantages,
High-speed winding still has to solve serious problems. One of them is that the thermoplastic synthetic fiber yarn obtained by the above-mentioned high-speed spin draw method or high-speed spinning take-up method is used as it is for knitting or weaving, and when it is made into a woven fabric, it is particularly referred to as a “sink” due to heat treatment. There is a drawback in that the so-called woven surface is apt to have minute gloss unevenness. The woven fabric in which the “sink” defect has become apparent has substantially no commercial value, which is a serious problem in practical use.

In high-speed winding, the cause of such a “sink” defect is the effect of stress unevenness such as heat generation, elongation, compression, etc. received on the yarn when the thermoplastic synthetic fiber is wound into a cheese-like package at high speed. This is because the package is formed while it is internally connected to the filamentous spot.

The yarn unevenness is typified by the heat shrinkage property, and becomes apparent as a "shock" when the knitted fabric is heat-treated at about 60 ° C or higher.

Such filamentous unevenness easily concentrates at both ends of the cheese-like package. In the formation of the package, as a result of traversing due to traverse, more thread is laminated on both ends of the package in the axial direction of the bobbin, forming a so-called ear height shape, and this ear height portion is the contact roll of the winder. It is thought to be due to contact with.

For high-speed winding of 4000 m / min or more, a bobbin shaft drive type winding machine that directly drives a bobbin shaft with a contact roll is generally used. The winding mechanism of the bobbin shaft drive type winding machine winds a package formed by laminating yarns on a bobbin with a stable shape while pressing it with a contact roll. At this time, the power required to rotate the contact roll is
All are propagated by frictional contact between the package and the contact roll. (The driving method of such a contact roll is referred to as a “driven method”.) In order to carry out high-speed winding with such a bobbin shaft drive type winder equipped with a driven contact roll, the energy to be propagated As a result of the investigation, it was revealed that it is difficult to maintain the normal shape during winding except for the package shape of the ear height because of the large size of the ear. JP-A-60-209013 discloses
According to the conventional bobbin shaft drive type winder for obtaining a cheese-like package, the reason for attaching a contact roll,
It is said that it is difficult to eliminate the yarn unevenness, and as an alternative to that, it is proposed to wind the package cage in a taper-pan shape without contacting other packages during winding.

Therefore, it is a cheese-like package that is wound at a high speed of 4000 m / min or more, and has good shape stability, and heat that does not cause `` sink '' defects by directly providing the yarn to the knitted fabric from the package. At present, no cheese-like package of plastic synthetic fiber yarn has been found.

The present invention provides a thermoplastic synthetic fiber thread-like cheese-like package which has good shape stability and is capable of directly providing a yarn from a package to a knitted fabric to obtain a knitted fabric having an excellent quality without a “shrink” defect. With the goal.

[Means for Solving Problems] The inventors of the present invention have made extensive studies in order to solve the above problems, resulting in filamentous unevenness that causes a “shrink”, a method for winding a cheese-like package and a package. The present invention has solved the above-mentioned problems by finding the fact that the “sink” can be completely eliminated by focusing on the fact that it is deeply related to the shape of the above, and forming a package in which the yarns are laminated at a specific winding angle.

That is, the present invention is made by laminating synthetic yarns that are substantially untwisted at a breaking elongation of 90% or less, and have a twist angle of 4.0 ° to 5.5.
And a difference in dry heat shrinkage stress value in the yarn length direction between the yarns including the yarns at the ear-height portion and the yarns at other portions is 40 mg / d or less. A cheese-like package of yarn is provided.

Further, according to the present invention, when winding a yarn at a speed of 4000 m / min or more into a cheese-like package by a bobbin shaft drive type winder, a winder having a self-driving contact roll is used and a winding winding angle is 4.0 °. Provided is a method for winding a thermoplastic synthetic fiber yarn, wherein the winding is performed at a contact pressure of not more than 5.5 ° and not more than 3 kg / package.

The high-speed winding referred to in the present invention is for winding a thermoplastic synthetic fiber yarn at a winding speed of 4000 m / min or more, and typically,
JP-A-57-16913, JP-A-57-143514, JP-A-58-2
It is applied to high-speed winding of the method disclosed in 08416, etc.

The thermoplastic synthetic fiber yarn referred to in the present invention means a thermoplastic polyester represented by polyethylene terephthalate, polybutylene terephthalate, etc., a thermoplastic polyamide represented by polyhexamethylene adipamide, polycaproamide, polypropylene, polyethylene and the like. A synthetic fiber yarn obtained from a fiber-forming thermoplastic polymer such as thermoplastic polyolefin.

The thermoplastic synthetic fiber yarn of the present invention is not wound once after being spun and cooled, but is stretched or wound around a bobbin without stretching, and is substantially twist-free. Distinguished from those having untwisting by rewinding.

Since the yarn is taken out from the package and directly provided to the knitted fabric, the yarn preferably has sufficient mechanical properties to withstand handling in the weaving process. For typical general-purpose polyethylene terephthalate, polyhexamethylene adipamide, polycaproamide, etc., the strength is preferably 3 g / d or more and the elongation is 90% or less.

In the package of the present invention, it is necessary that the yarn has a twist angle of 4.0 ° to 5.5 °.

The twist angle formed by the yarn is a thread-like twist angle (θ °) laminated on the package in the schematic view of the package shown in FIG. In high-speed winding, the setting of the winding angle is extremely important in order to obtain a cheese-shaped package having a large amount of winding of the package of several kilograms to several tens of kilograms with good roll shape stability.

That is, when the winding angle becomes low, it becomes difficult to maintain the normal shape during winding, and so-called collapse occurs. Further, even after winding, the package often collapses when it is moved or transported. For this reason, in a high-speed winding package, the yarn-shaped winding angle is 6 ° or more, and usually 7 ° to 8 ° are laminated. On the other hand, it was revealed that when the yarns were laminated with such a high traverse angle, the obtained package had a shape with a prominent ear height, and the occurrence of "sink" was remarkable due to the filamentous unevenness.

The present invention is a cheese-like package obtained by adopting a special winding method described below, which has a yarn winding angle of 4.0 ° to 5.5 °, good winding shape stability, and low ear height.

If the winding angle of the yarn is less than 4.0 °, a package with a stable winding shape cannot be obtained no matter how the winding conditions are changed. Twill angle is 5.5
If it exceeds ゜, the height of the ears becomes conspicuous, and a package of uniform thread quality cannot be obtained. A more preferable winding angle is 4.0 ° to 5.5 ° for the purpose of winding shape stability and eliminating yarn unevenness.

With such a specific traverse angle, extremely good winding shape stability and reduction of the ear height can be achieved not only in the winding amount of several kilograms but also in the large winding amount of ten and several kilograms.

The cheese-like package of the present invention, in addition to the above-mentioned twill angle,
Saddle bag portion of the yarn and the yarn and the yarn length direction of the dry heat shrinkage stress value difference of the yarn including the other part ₍₁ - ₂₎ as a second feature that is not more than 40 mg / d There is.

As a result of careful examination of the correspondence between the occurrence of the “sink” defect and the yarn quality unevenness of the yarn of the package, the present inventors found that the dry heat shrinkage stress value of the yarn of the package was uneven in the yarn length direction. "Sink"
It was found that it corresponds well with the occurrence of. As a result of further study, the yarn at the contact portion between the package being wound and the contact roll tends to have a higher dry heat shrinkage stress value than the yarn at the non-contact portion, and there is a difference in this stress value. It has been found that if the value is less than or equal to the value, "sink" does not occur. The package of the present invention has a dry heat shrinkage stress difference of 40 mg / d or less in the yarn length direction of the yarn including the yarn at the height of the selvage and the yarn at the other portions, which is measured by the method described below. Has been formed. From the effect of further reducing "sink", the shrinkage stress value difference is preferably 20 mg / d or less, and more preferably 15 mg / d or less.

In the conventional ear height package obtained by winding at a winding angle of 6 ° or more, the difference in the heat-sensitive shrinkage stress value in the yarn length direction of the yarn including the yarn at the height of the ear and the yarn at other portions is 40 mg / The features of the package of the present invention are clear even when viewed from the fact that it cannot be less than d. Note that such heat shrinkage stress characteristics are satisfied from the winding start to the winding end of the package.

Hereinafter, the method for producing the cheese-like package of the present invention will be described.

The package of the present invention has a winding winding angle of 4.
In winding at 0 ° to 5.5 °, it was possible to obtain it only by using a winder having a self-driving contact roll.

A detailed description will be given below with reference to the accompanying drawings showing an example of a winding machine for carrying out the method for manufacturing a package according to the present invention.

FIG. 2 shows a main structure of a winding machine for carrying out the winding method according to the present invention. Prior to explaining the winding method of the present invention with reference to FIG. 2, the problems in the conventional winding method will be clarified with reference to FIG.

FIG. 3 shows the overall structure of a winding machine for winding a yarn.
In FIG. 3, the yarn 13 being wound and fed through the yarn guide 14 is traversed in the axial direction of the contact roll 5 by the traverse device 10 while passing through the rotating contact roll 5. The cheese-like package 3 is wound around the outer circumference of the bobbin 2 on which the rotating bobbin shaft 1 is mounted. The yarn 13 reciprocated by the traverse device 10 forms the height of the ear 11 at both ends of the package 3. Therefore, the package 3 comes into contact with the contact roll 5 only at the ear height portion 11, and the intermediate surface of the package 3 has a gap Δh. Rotational force is transmitted to the contact roll 5 through this ear height portion 11, and during high speed winding, this rotation transmission force extends the yarn 13 of the ear height portion 11 and causes heat generation, Winding body
A yarn quality difference is caused between the yarns of the intermediate portion 12 of 13 and the ear height portion 11.

As is well known, in order to transmit the rotational force without causing slip between the contact roll 5 and the package 3, an excessive contact pressure is required, and the contact pressure is applied to the ear height 11 and the crushing force. The wound shape is deteriorated and the yarn unevenness is increased.

As shown in FIG. 2, in one embodiment of the device for carrying out the winding method according to the present invention, the bobbin shaft 1 is connected to the bobbin shaft driving device 4, and further the bobbin shaft driving inverter 8 is provided. Thus, the bobbin 2 mounted on the bobbin shaft 1 is driven while frequency control is performed so that the surface peripheral speed of the package 3 wound around the bobbin 2 becomes constant. One contact roll 5
Is connected to a contact roll driving device 7 via a transmission device 6, and further, by a contact roll driving inverter 9, a frequency and a driving force necessary for rotation of the contact roll 5 matching the surface peripheral speed of the package 3. Is supplied. Therefore, the contact roll used in the present invention is a self-driving contact roll.

The drive inverter of the bobbin shaft and the drive inverter of the contact roll may be a mechanism which mutually adjusts as shown in JP-A-52-21438, but from the meaning of completely eliminating yarn unevenness. It is preferable that the drive inverters of the contact rolls have high speed control accuracy and that the drive inverters of the both are controlled independently of each other.

In this case, as a control method for gradually reducing the bobbin shaft rotation speed accompanying the increase in the warp of the package, a method of storing the gradually decreasing speed in a computer and controlling it, a tension control for controlling the change in the tension applied to the yarn by feeding back A method, such as a peripheral speed control method for controlling changes in the peripheral speed of the contact pressure roll or the wound body by feeding back, is adopted.

The contact roll driving device 9 used in the winder of the package manufacturing method of the present invention is preferably a high-speed three-phase induction motor. The method of connecting the motors is not limited to the embodiment, and may be directly connected to the shaft of the contact roll, or may be incorporated in the contact roll and implemented by an outer rotor type. Furthermore, an air turbine drive can be used without using a motor.

The driving force supplied to the driving of the contact roll depends on the peripheral speed of the contact roll measured in the state where the contact roll is not in contact with the bobbin shaft without winding and the peripheral speed of the desired wound body. If the driving force at the same speed is 100%, and within the range of 75% to 125%, the object of the present invention to obtain a package having a good winding shape and uniform yarn quality can be sufficiently achieved.

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

The cheese-like package having a twill angle of 4.0 ° to 5.0 ° specified in the present invention can be obtained for the first time by the above winding machine. That is, it has been impossible to obtain such a package having a low traverse angle with good shape stability by the conventional winder equipped with the driven contact roll.

In the present invention, it is necessary to use the winding machine described above and, at the same time, wind the contact pressure during winding to 3 kg or less per package. When the contact pressure exceeds 3 kg per package, it is difficult to solve both the winding shape stability of the package and the yarn unevenness at the same time, no matter how accurately the rotation speed of the self-driving contact roll is controlled.

According to the present invention, by the combination of the winding method and the winding angle as described above, the winding shape is stable, and the yarn including the yarn at the ear-height portion and the yarn at the other portion is dried in the yarn length direction. Difference in heat shrinkage stress value is 40 mg
We succeeded in obtaining a cheese-like package with a uniform thread quality of less than / d.

Further, in the present invention, it was possible to realize low contact pressure winding of 2 kg or less per package, which was thought to be impossible in high-speed winding, and the dry heat shrinkage stress value difference was achieved to 20 mg / d or less. That is what I got.

In the cheese-like package of the present invention, the yarn can be directly applied to the knitted fabric to obtain good quality. According to the knowledge of the present inventors, this is due to the effect of the self-driving contact roll, the transmission of drive energy at the contact portion between the package and the contact roll is stopped, heat generation and stress generation are suppressed, and the contact roll is being wound. The shape and thread quality of the portion pressed by do not change.

Further, the yarn laminated on the package with a low winding angle is easily relaxed after winding at both ends, and further uniformization is achieved.

Therefore, it is assumed that the package has the dry heat shrinkage stress value difference specified in the present invention for the first time, and the occurrence of "sink" can be eliminated.

〔Example〕

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

<Difference in dry heat shrinkage stress value> Using a thermal stress measuring instrument KE-2 manufactured by Fuso Engineering Co., Ltd., a sample length of 10 cm, an initial load of 10 mg / d was applied, and then the temperature was raised at a heating rate of 150 ° C / min. Then, a dry heat shrinkage stress curve was drawn.
The maximum value of this curve (reading value divided by sample denier x 2) was used as the dry heat shrinkage stress value (F mg / d).

The difference in dry heat shrinkage stress value in the yarn length direction is
Be sure to measure the height of the selvage so that it is several points in one traverse direction (from one end to the other end) (for example, 7 to 8 points when the yarn length of one traverse is about 1.5 m). ) Of thermal stress is measured. This measurement was carried out for 5 traverses. In the obtained measurement results, the average dry heat shrinkage stress value of the ear height was set to ₁ mg / d, and from the measured values other than the ear height, the same number as the ear height was extracted from the one with the smallest value. Calculate the average value
_{It was set to 2} mg / d.

The dry heat shrinkage stress value difference in the yarn length direction was obtained by the following formula. Dry heat shrinkage stress value difference (△ F) _{= 1} - ₂ a (mg / d) <winding shape> bulge shown At a FIG. 4 (a) shows the bulge ratio (a%).

Bulge rate (a%) needs to be 10% or less, 5%
The following is good.

<Display of latitude “sink” (W)> Defect level of latitude “sink” is divided into four levels, W = 0 to 1
W = 0: no sink mark, W = 1: extremely small sink mark, W = 2: sink mark, W = 3: strong sink mark, Example 1, Comparative Example 1 Intrinsic viscosity [η] = 0.58 polyethylene terephthalate
After melt-spinning at 295 ℃ and cooling, all filaments are focused and oiled at a position 15 cm below the thinning completion point without stretching.
As a 75d / 36f yarn, it was wound by a winder at a speed of 7,000 m / min to obtain a cheese-like package having a winding amount of 10 kg. The physical properties of the yarn were a breaking strength of 4.1 g / d and an elongation of 40%.

At the time of winding, a spindle drive winder equipped with a self-driving contact roll as shown in Fig. 2 is used, and the contact angle per package is kept constant at 2 kg. Different packages were obtained as shown in.

Other conditions in this embodiment are as follows.

Bobbin outer diameter; 140mmφ traverse stroke; 160mm winding tension; 0.20g / d self-driven contact roll control system; peripheral speed control system Then, from these packages, the entire amount of yarn is directly fed into the Nissan Water Jet Room ( LW-51 type) and weaved into a plain woven fabric with a standard of warp density of 100 yarns / in and weft density of 80 yarns / in. After scouring and pre-setting the raw fabric of this plain fabric
It was dyed at 130 ° C, and the quality of the weft "sink" was judged.

Table 1 shows the bulge rate (a%), which is the characteristic of the shape of the 100 kg winding package, and the heat shrinkage stress value difference (ΔF) in the surface layer,
The textile quality corresponding to this is shown.

As is clear from Table 1, the cheese-like package obtained according to the present invention has good roll shape stability and can be directly used for the weft of the woven fabric to obtain good quality.

Comparative Example 2 When performing the same spinning and winding as in Example 1, a spindle drive winder equipped with a conventional driven contact roll having no self-driving force was used, and the winding angle of 5.4 in Example 1 was used.
Attempts were made to wind the samples at ° and 4.6 °, but during the winding the shape collapsed and it was not possible to obtain a package.

The package wound up at a twill angle of 6.5 ° had a large difference in dry heat shrinkage stress value of 54 mg / d, and the quality of the woven fabric was extremely poor with a weft “shake” W = 3.

Example 2 Winding was performed under the same conditions as in Example 1 except that the winding angle was kept constant at 5.0 ° and the contact pressure during winding was varied as shown in Table 2, and the quality of the woven fabric was examined.

As is clear from Table 2, the contact pressure per package is 3K.
The package obtained with g or less, and further 2 Kg or less can obtain good winding shape and woven fabric quality.

Example 3 Polyhexamethylene adipamide having a relative viscosity (VR) of 40 measured in 90% formic acid at a polymer concentration of 8.4% by weight was melt-spun at 300 ° C. and, after cooling, 40d / 13f without stretching and third Winding was performed at the speed shown in the table to obtain a cheese-like package of 8 kg. At the time of winding, the winding machine equipped with the self-driving contact roll shown in FIG. 2 was used, and the winding pressure was 4.8 ° with the contact pressure per package being constant at 1 kg.

From the obtained package, a normal polyhexamethylene adipamide yarn is used as a warp, and the polyhexamethylene adipamide yarn wound by the winding method is directly used as a weft yarn from the package. A plain weave fabric was prepared in the same manner as in Example 1 except that the value was / in. Table 3 shows the weave "sink" quality of the woven fabric dyed at 100 ° C after scouring and presetting.

As is clear from Table 3, the cheese-like package obtained according to the present invention gave a good quality woven fabric after weaving.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a winding angle of a yarn laminated on a package, FIG. 2 is an embodiment of a winder used for manufacturing the package of the present invention, and FIG. It is a schematic diagram which shows the pattern of taking. FIG. 4 is a sectional view showing an example of the shape of the package.

Claims (2)

[Claims] Claims: 1. Laminated synthetic yarns having a breaking elongation of 90% or less and substantially non-twisted, the yarns having a twist angle of 4.0 ° to 5.5 °, and having yarns at the ear-height portion. Cheese-like package of thermoplastic synthetic fiber yarn, characterized in that the difference in dry heat shrinkage stress value in the yarn length direction of the yarn including the yarn of the other part is 40 mg / d or less 2. When winding a yarn at a speed of 4000 m / min or more as a cheese-like package by a bobbin shaft drive type winder, a winder having a self-driving contact roll is used and a winding winding angle is 4.0. Winding method for thermoplastic synthetic fiber yarn, characterized in that it is wound at a contact angle of 3 ° g / package or less at ゜ -5.5 ゜