JPH0737299B2 - Direct winding polyamide fiber yarn cheese package - Google Patents

Description

The present invention relates to a cheese-like package of polyamide fiber yarns. More specifically, the present invention relates to a cheese-like package of polyamide fiber yarns, which has good shape stability and is capable of providing a knitted fabric with a yarn directly from the package to obtain a knitted fabric of excellent quality.

[Problems to be solved by conventional technology and invention]

In recent years, the production of polyamide fibers has been strongly required to improve productivity, and the spinning speed is more than 4000 m / min. Spinning-drawing-high-speed spin-drawing method in which winding is continuously performed, or spinning process, for example, 4000 m / min. Attempts have been made to manufacture by a high-speed spinning take-up method (for example, Japanese Patent Laid-Open No. 57-143514) which uses a take-up speed higher than a minute.

However, in order to fully utilize the above advantages,
High-speed winding still has to solve serious problems. One of them is a polyamide fiber yarn obtained by the above-mentioned high-speed spin draw method or high-speed spinning take-up method,
If it is used as it is for knitting, there is a drawback that minute gloss unevenness on the surface of the fabric, which is called a “shrink”, is likely to occur remarkably when heat-treated, especially when it is formed into a fabric. The woven fabric in which the “sink” defect has become apparent has substantially no commercial value, which is a serious problem in practical use.

The cause of such "sink" defects in high-speed winding is the effect of stress unevenness such as heat generation, stretching, and compression on the yarn when the polyamide fiber is wound into a cheese-like package at high speed. This is because the package is formed with the spots left inside.

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 yarn 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 yarns are 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 contacts the winder. It is thought that this is due to contact with the roll.

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 the package formed by laminating the yarns on the bobbin with contact stability while pressing the package with good shape stability. 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 study, it was found that it is difficult to maintain the normal shape during winding, except for the package shape with the ear height, because of the large amount. Japanese Unexamined Patent Publication No. 56-127558 proposes to form a bulge in the center of the package and to wind the bulge by contacting the contact roll with the bulge at all times during winding. In the high-speed winding for more than a minute, the normal end lamination of the package was not performed and the formation of the package was impossible. JP-A-60-209013 discloses a polyester fiber yarn, but in a conventional bobbin shaft drive type winder for obtaining a cheese-like package, the unevenness in yarn quality is eliminated because a contact roll is attached. It is said to be difficult, and as an alternative to it, it is proposed to wind the package into a tapered pattern without contacting anything else during winding.

Therefore, it is a cheese-like package wound at a high speed of 4000 m / min or more, has good shape stability, and is a polyamide fiber that does not cause a "shrink" defect by directly providing a yarn from the package to a knitted fabric. Currently, no cheese-like package of yarn has been found.

The present invention provides a cheese-like package of polyamide fiber yarns, which has good shape stability and is capable of providing yarns directly from the package to the knitted fabrics to obtain a knitted fabric of excellent quality without "sink" defects. To aim.

[Means for solving problems]

As a result of intensive studies to solve the above-mentioned problems, the present inventors have noticed that the filamentous unevenness that causes "sink" is deeply related to the winding method of the cheese-like package and the shape of the package. The present invention has solved the above-mentioned problems by finding the fact that "sink" can be completely eliminated by forming the yarn in a specific package shape.

That is, the object of the present invention is a cheese-like package obtained by directly winding a substantially non-twisted polyamide fiber yarn having an elongation of 90% or less from a spinning machine at a speed of 4,000 m / min or more, Dry heat shrinkage in the yarn length direction of the yarn of the portion having a hardness higher than that of the ends and the yarn of the portion other than the end having a hardness of 2 mm or more from the both ends of the package toward the center Achieved by a cheese-like package of direct-wound polyamide fiber yarns, characterized in that the difference in stress values is less than 40 mg / d.

The high-speed winding referred to in the present invention is to wind a polyamide fiber yarn at a winding speed of 4000 m / min or more, and typically, JP-A-57-16913 and JP-A-57-143514, Same as 58-208
It is applied to high-speed winding of the method disclosed in Japanese Patent No. 416 or the like.

The polyamide fiber yarn in the present invention means a synthetic fiber yarn obtained from polyhexamethylene adipamide, polycaproamide and the like.

The directly wound polyamide fiber yarn of the present invention is wound around a bobbin at a speed of 4000 m / min or more without being once wound after being spun and cooled, and without being drawn or drawn. Not twisted. Distinguished from those having untwisting by rewinding. The elongation of the yarn thus obtained is generally 90% or less.

Since the yarn is taken out of the package and directly provided to the knitted fabric, the yarn preferably has sufficient mechanical properties to withstand handling in the knitting and weaving process. For typical general-purpose materials such as polyhexamethylene adipamide and polycaproamide, it is desirable that the strength is, for example, 3 g / d or more.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings illustrating one embodiment of the cheese-like package according to the present invention.

In the cheese-like package of the present invention, firstly, a plurality of portions (hereinafter, referred to as convex portions) having hardness higher than the end portions are present from both ends of the package toward the central portion side in the bobbin axial direction.
It is a feature of.

The convex portion 5 is a bulge portion existing on a line along the bobbin axis direction of the package 1 as illustrated in the package cross-sectional view of FIG. 1, and has a winding diameter slightly larger than other portions. Such yarns are laminated. The winding diameter difference Δh is preferably about 0.2 mm to 3 mm from the viewpoint of winding shape stability. More preferably, it is about 0.2-1 mm.

The convex portion 5 is present on both sides of the package 1 on the central portion side in the axial direction of the bobbin from the both end portions 2, but the position from the both end portions (first
In the figure, l ₁ , l ₂ ) is required to be 2 mm or more for the effect of eliminating the “sink”. This position is preferably 4 mm to 15 mm for the purpose of maintaining good shape stability during and after high-speed winding. The positions from both ends 2 do not necessarily have to be the same on the left and right, but in consideration of the ease of traverse, normally, symmetry (l ₁ = l ₂ ) with respect to the center is adopted.

The convex portion 5 needs to be formed with a hardness higher than that of both end portions 2 (ears) of the package 1.

By setting the hardness higher than that at both ends 2, the tension of the yarns at both ends 2 is weakened, and the effect of relaxing the yarns at both ends 2 after winding is promoted, whereby "sinking" can be eliminated. Becomes A desirable hardness difference between the end portion 2 of the package 1 and the convex portion 5 is 5 ° to 20 °.

The package of the present invention is easily distinguished from the conventional ear height package due to the unique hardness distribution in which there are portions of high hardness other than both ends in the bobbin axial direction.

For the purpose of improving the shape stability, the convex portions 5 are provided at a plurality of locations on the central portion side of the package 1 in the bobbin axial direction. Usually, if you consider the complexity of the traverse mechanism, 2-3
There are two locations, preferably two.

The peculiar winding shape as described above is laminated almost uniformly from the winding start to the winding end of the package 1. as a result,
It is possible to impart extremely good winding shape stability not only to the winding amount of several kilograms but also to the large amount winding of ten and several kilograms.

The cheese-like package of the present invention, in addition to the above-mentioned winding shape, the difference in dry heat shrinkage stress value in the yarn length direction including the yarn of the high hardness portion and the yarn of the other portion is 40 mg / d. The second characteristic is that it is the following.

As a result of various careful examinations on the correspondence between the occurrence of the "sink" defect and the yarn quality unevenness of the package yarn, the present inventors found that the dry heat shrinkage stress value of the package yarn has unevenness 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. It has been found that if the value is less than a certain value, "sink" does not occur. In the package of the present invention, the difference in dry heat shrinkage stress value in the yarn length direction including the yarn of the high hardness portion (convex portion) and the yarns of other portions measured by the method described below is 40 mg / It is formed by d or less. From the effect of further reducing "sink", the difference in shrinkage stress value is preferably 20 mg / d or less, more preferably 15
It is good that it is mg / d.

The difference in the dry heat shrinkage stress value in the yarn length direction including the yarn at the edge height and the yarn at the other portions cannot be 40 mg / d or less in the conventional ear height package. From the above, the features of the package of the present invention are clear. Such heat shrinkage stress characteristics are satisfied from the beginning of winding the package to the end of winding.

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

The cheese-like package of the present invention can be obtained for the first time by winding a yarn with a bobbin shaft drive type winder equipped with a specific traverse mechanism and a self-driving contact roll.

That is, the method of providing the convex portion from the both ends of the package to the central portion side in the axial direction of the bobbin, a multi-speed method traverse device disclosed in Japanese Patent Publication No. 46-16298 and a known cam traverse device are adopted, This and the method of partially delaying the traverse speed when traversing the yarn in the bobbin axial direction, and the adoption of the multi-track traverse method of reversing the yarn reversal due to the traverse even from the end to the central part You can get it. As a more preferable method, a cam traverse adopting a multi-track traverse method is adopted. As shown in FIGS. 2 (a) and 2 (b), this multi-track traverse is a method in which the traverse is reversed not only at both ends but also at the center side. It is possible to provide a convex portion at a desired position and height. FIG. 2 (a) is an example of a two-track traverse, FIG. 2 (b),
(C) is an example of a three-track traverse, and FIG. 2 (d) is an example of a traverse which becomes a conventional ear height package other than the present invention. If the number of tracks is two or more, the package of the present invention can be obtained, but normally 2 to 4 are adopted.

The present invention can be realized for the first time by combining and winding the above-mentioned traverse mechanism with a self-driving contact roll.

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

A self-driving contact roll, for example, as disclosed in Japanese Patent Laid-Open No. 52-21438, is a system in which not only the bobbin shaft but the contact roll itself has a driving force. For the purpose of enabling the above, it is preferable that the speed detection and control mechanisms of both are independently performed.

FIG. 3 (a) is a schematic view showing a contact state with the contact roll during winding of the cheese-like package of the present invention. For comparison, FIG. 3B shows a contact state between the conventional ear height package and the contact roll. As is clear from FIG. 3, in the cheese-like package 1 of the present invention, the convex portion 5 is formed on the central portion side.

In manufacturing the package of the present invention, winding tension, traverse angle,
The contact roll contact pressure is applied in the range of conditions normally adopted for winding, but it is particularly preferable that the contact roll pressure is as small as possible in the range of winding.

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 findings of the present invention, When winding the package, since the position of the convex portion exists on the central portion side rather than both end portions, stress generation due to impact at the time of traverse reversal, and contact with the contact roll occurs less frequently at the same position, There is little change in the yarn quality at the ends.

． Due to the effect of the self-driving contact roll, the driving energy is not transmitted at the contact part between the package and the contact roll, heat generation and stress generation are suppressed, and the yarn quality of the part pressed by the contact roll does not change during winding. .

． Further, with the yarns laminated on the package, the yarns at both ends are easily relaxed after winding, and further uniformization is achieved.

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

〔Example〕

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

・ Dry heat shrinkage stress value Kanebo Engineering Co., Ltd. heat stress measuring instrument KE-2 type was used, the sample length was 10 cm, the initial load was 10 mg / d, and the temperature was raised at a heating rate of 150 ° C./min to dry heat shrinkage. A stress curve was drawn. The maximum value of this curve (reading value divided by sample denier x 2) was taken as the dry heat shrinkage stress value (Fmg / d).

The difference in the dry heat shrinkage stress value in the yarn length direction is measured at several points in one traverse (from one end to the other end) of the package yarn so that the convex portion is always measured. For example, if the yarn length of one traverse is about 1.5 m, it will be 7 to 8 points.)
The thermal stress value of is measured. This measurement was carried out for 5 traverses. In the obtained measurement results, the average value of the dry heat shrinkage stress value of the convex portion was set to ₁ mg / d, and among the measured values other than the convex portion, the same number as the convex portion was extracted from the smallest value. The average value was calculated | required and it was set to ₂ mg / d.

The difference in dry heat shrinkage stress values in the yarn length direction was calculated by the following formula. Dry heat shrinkage difference between the stress value _{(ΔF) = 1 - 2 (} mg / d) · Hardness Shimadzu using HARDNESS TESTER, each for end and convex portions in the bobbin axial direction of the package, a circle across the diameter of the package The hardness was measured at a position equally divided into eight in the circumferential direction.
An average value of n = 8 was obtained for each, and the difference was defined as the hardness difference.

・ Indication of sutra “sink” (w) The defect level of sutra “sink” is divided into 4 levels, W = 0 to 1
W = 0: no sink mark, W = 1: extremely slight sink mark, W = 2: sink mark present, W = 3: strong sink mark present, Example 1 of relative viscosity 2.4 measured with 95% sulfuric acid Polycaproamide 2
Melt-spin at 70 ℃, cool down, and draw 50 ^d / 17 without stretching
^{As f} , winding was performed at the speed shown in Table 1 to obtain a cheese-like package having a winding amount of 8 kg.

At the time of winding, the spindle driven winder equipped with the self-driving contact roll shown in FIG.
The winder equipped with the 3-track traverse type cam traverse shown in FIG. Yarn by traverse,
The reversal radius (R) of the yarn is R ₁ , R ₂ = 20 mm,
The yarn was set to R ₃ = 15 mm, the interval between the yarn and the reverse position of the yarn was set to 5 mm, and a package was obtained.

Other conditions in this embodiment are as follows.

Bobbin outer diameter: 140 mmφ Traverse stroke: 160 mm Winding tension: 0.25 g / d Winding contact pressure: 0.25 kg / package one stroke length Winding winding angle: 6 ° Self-driven contact roll control method; Peripheral speed control method Winding The shape stability in the inside was good, and the position (l ₁ = l ₂ ) from the end of the convex portion of the package was 4 mm.

From the obtained package, a normal polycaproamide yarn is used as a warp, and the polycaproamide yarn wound by the above-described winding method is directly used as a weft to produce a Nissan Water Jet Loom (LW-51 type). Supply and weave, warp density
A plain woven fabric with a standard of 100 yarns / in and weft density of 105 yarns / in was used. The quality of the weft “sink” of the woven fabric dyed at 100 ° C. after scouring / presetting was judged.

Table 1 shows the characteristics of the package and the corresponding quality of the sink mark.

As is clear from Table 1, the cheese-like package obtained according to the present invention gave a good quality woven fabric after weaving.

〔The invention's effect〕

Since the cheese-like package of the polyamide fiber yarn according to the present invention is configured as described above, the cheese-like package of the polyamide fiber specified in the present invention has good shape stability, and the yarn is directly knitted or woven. The knitted fabric obtained by use can be of good quality. In particular, it has a special effect when used as a warp and a weft of a woven fabric.

The present invention exerts a more remarkable effect at a winding speed of 5000 m / min, particularly at a high speed of 6000 m / min or more.

[Brief description 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 view showing various examples of yarn reversal loci due to traverse, FIG. 3 (a) shows the case of the cheese-like package of the present invention, and FIG. 3 (b) shows the case of the conventional ear height package. DESCRIPTION OF SYMBOLS 1 ... Cheese-shaped package, 2 ... Package end part, 3 ... Yarn reversal locus, 4 ... Yarn, 5 ... Convex part, 6 ... Contact roll, 7 ... Bobbin, ... Article.

Continuation of the front page (56) References JP-A-56-127558 (JP, A) JP-A-57-143514 (JP, A) JP-B-50-22130 (JP, B1)

Claims (1)

[Claims] 1. A cheese-like package obtained by directly winding a substantially non-twisted polyamide fiber yarn having an elongation of 90% or less from a spinning machine at a speed of 4,000 m / min or more. Dry heat shrinkage stress value in the yarn length direction of the yarn having a plurality of portions having a hardness higher than those of the ends on the central portion side of 2 mm or more from both ends, and the yarn of the portion having a higher hardness and the yarns of other portions Difference of 40 mg / d or less, the cheese-like package of the direct winding polyamide fiber yarn, and the dry heat shrinkage stress value is 10 mg / d applied to the polyamide yarn and suspended. Is the maximum shrinkage stress value when heated at a heating rate of 150 ° C./min in air.