JPS6152249B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a bulky crimped yarn made of thermoplastic synthetic fiber multifilament, and more specifically, there is no substantial thickness unevenness in the longitudinal direction of the yarn, and there is no thickness unevenness only in the crimped shape, that is, in the appearance. This article relates to a special crimped yarn that has a characteristic that even if it is a processed yarn obtained from a thermoplastic synthetic fiber multifilament yarn that is uniform in the longitudinal direction, the surface of the fabric product made of the yarn is It is capable of imparting unique spots that resemble natural fibers (in appearance). Conventionally, ordinary thermoplastic synthetic fiber multifilament yarns (e.g., polyester fibers, etc.) have been mixed with natural fibers (e.g., cotton yarns, etc.) in irregularities in the longitudinal direction.
It is extremely uniform compared to other yarns, which is one of its major advantages, but on the other hand, because it is too uniform, the surface of fabric products made from raw or processed yarns is monotonous, resulting in a metallic appearance with no surface changes. . In terms of the appearance of crimped thermoplastic synthetic fiber multifilament yarn, yarns with thick and fine irregularities in the longitudinal direction can be broadly classified into: (1) Special yarn manufacturing conditions such as thick and thin yarn, etc. (2) Processed yarn with unevenness in the longitudinal direction of the yarn at the manufacturing stage. (3) Although the yarn was uniform in the longitudinal direction at the raw yarn stage and bulk processing stage, the processed yarn had thick and fine irregularities in its appearance at the time of subsequent reheat treatment. It is broadly divided into. Here, we compare the characteristics of (1) to (3) as follows. (1) is, for example, the special public service of 1975-6615.
The raw yarn described in the above publication may be bulk-processed, but in that case, since the undrawn portion of the filament is thick, a bulk-processed yarn having thick and thin threads in the longitudinal direction can be obtained. However, when the form of the bulky textured yarn is observed in detail, for example, in a method that does not utilize heat, such as fluid processing, the loops or curls of the filament in the undrawn portion become rougher than in other normal portions. Furthermore, when heating is applied, for example during false twisting, unstretched portions may fuse or cracks may occur due to the phenomenon of appropriate twisting, and the crimp form is extremely unstable, resulting in fabric products being It is prone to defects such as steps and stripes. Furthermore, as a disadvantage of the yarn produced by this method, in the case of bulky processed yarn that does not involve heat treatment, there is a problem of deterioration over time in the undrawn part, and conversely, in the case of bulky processed yarn that is subjected to heat and twist distortion, embrittlement of the undrawn part becomes a problem. This causes problems such as poor operability. Moreover, there is a limit to the degree of mottling (interval and periodicity of mottling) that can be imparted at the yarn manufacturing stage, and the appearance of the mottling cannot be changed to a large extent during subsequent bulk processing. Next, as the yarn in (2), for example,
In the publication, a special treatment is performed prior to the false twist crimp process to change the processing effect during the false twist crimp process. However, with this type of yarn, the part of the yarn where water is attached is heated compared to other parts, causing a difference in twist strain in the twisting zone, causing a decrease in strength, or the single fibers that make up the yarn. The crimp pitches of the filament tend to have unevenness in the longitudinal direction, which tends to cause defects such as steps and stripes in the fabric product. For example, as described in Eda Tokuko No. 39-26161, the yarn in (3) can be prepared by applying a swelling agent, a dissolving agent, etc. intermittently to bulky processed yarn while it is stretched, or The bulky portion of the bulky textured yarn was obtained by applying heat or the like to induce a swelling state at the attachment point to lose its bulky shape and at the same time to elongate and re-fix it in a straight line. There is a thread in which straight sections are repeated intermittently.
In this case, since the yarn in the treated portion undergoes an elongation treatment in which it is in a swollen state with a swelling agent, etc., it is difficult to reduce the bulking effect caused by crimp of the single filaments that make up the yarn. Not only that, but the thickness or physical properties of the filament itself changes significantly, and there are many management problems in industrially mass-producing the filament while controlling the extent of the change. The present invention eliminates the conventional drawbacks (1) to (3) above. That is, the present invention is a crimped yarn created by twisting and straining a thermoplastic synthetic fiber multifilament yarn, in which the appearance of the yarn under no tension or under slight tension is thick and thin in the longitudinal direction. The turning property of the constituent single filament is based on a special crimped yarn characterized by a thick yarn portion being larger than a thin yarn portion. The present invention will be explained in detail below. The special crimped yarn of the present invention is a bulky crimped yarn due to twisting distortion, and even though there is no change in the thickness unevenness of the yarn itself, the twisting torque of the single filament that makes up the yarn changes. Even if there is no significant difference in the swirlability of the yarn as a whole, only the apparent appearance changes, and this change in the apparent appearance causes a change in the surface appearance of the fabric product. be. In the present invention, a crimped yarn by twisting refers to a crimped yarn obtained by twisting a yarn in one direction, heat-setting it, giving twisting deformation to each single filament, and then untwisting it. Refers to yarn, examples of which include false twisted crimped yarn. In ordinary twisted yarn, if 4 to 5% of yarn with uneven fineness is mixed in, it tends to cause steps, stripes, etc. in the fabric product, but the yarn of the present invention has no substantial uneven fineness. Because it has a sufficient thickening effect, it can eliminate steps caused by irregularities in fineness between and within yarns in fabric products.
This has a remarkable effect in that there is no concern about the occurrence of stripes or the like. In the present invention, it is preferable that the fineness unevenness of the entire yarn in the longitudinal direction under a tension of 0.05 g/d or more is 4% or less, and the apparent diameter ratio of the entire yarn under a tension of 0.001 g/d or less is preferable. That is, it is preferable that the diameter ratio of the thick thread part and the thin thread part is 1.5 or more. Further, in the yarn of the present invention, the twist pitch in the longitudinal direction of each single filament constituting the yarn does not need to have a substantial difference between the thick portions of the yarn, and the thick yarn portion and the thin yarn portion It is possible to obtain a difference in bulkiness in appearance based only on the difference in torque (turning ability). The ratio of the swirlability of the single filament in the thick yarn part and the thin yarn part is 1.6.
It is preferably at least 1.7, particularly preferably at least 1.7. In this way, there is a difference in bulk in appearance due only to the difference in torque between the thick yarn portion and the thin yarn portion, so the surface appearance of fabric products obtained from such yarns is uniform with mild unevenness. Whereas the appearance of conventional partially twisted yarn fabrics gives the impression of intentionally created unevenness, the fabric obtained from the yarn of the present invention has stable and gentle natural unevenness. has advantages. Hereinafter, the yarn of the present invention will be explained in more detail. Figure 1 is an external view of the yarn of the present invention, Figures 2 to 5
Each figure is a schematic diagram of the appearance of a single filament that constitutes a yarn, and Figure 2 is an example of the crimp shape of a conventional partially twisted yarn observed under tension.
The figure shows a single filament corresponding to Fig. 2 under no tension or slight tension, Fig. 4 shows the crimp shape of Fig. 1 (the yarn of the present invention) observed under tension, and Fig. 5 shows no tension. Alternatively, it is a single filament corresponding to FIG. 4 under slight tension. The yarn of the present invention is a thick yarn portion (hereinafter referred to as A type yarn) in the longitudinal direction of a normal false twisted bulky twisted yarn of a thermoplastic synthetic fiber filament.
and thin thread portions (hereinafter referred to as B-type threads) are alternately present at arbitrary lengths and intervals. Here, since the number of false twists of type A and type B is the same, the crimp pitch of the single filament constituting the yarn is substantially the same between A and B. A method of creating a B-type yarn and making only a certain part of the yarn into an A-type yarn is, for example, by sequentially twisting → heat setting → untwisting, and then twisting a specific part of the yarn in a relaxed state. It is effective to provide heat shielding only under specific conditions. Any method can be used to insulate the heat to meet specific conditions, but a stable and reliable method is to drop water droplets on the false twisted crimped yarn running in a relaxed state, and each It is preferable to carry out the dry heat relaxation treatment in a state where water is sufficiently soaked between the crimp crimps of the single filament. In the dry heat relaxation heat treatment area, the twisting torque due to the twisting strain of the single filament that makes up the yarn in the non-water-containing portion is relaxed, the crimp changes from three-dimensional to two-dimensional, and the yarn becomes less elastic. In contrast, the single filament that makes up the yarn in the water-containing portion remains bulky until the water dries even if the dry heat treatment temperature in the relaxation heat treatment area is above the boiling point of water. Since the heat of vaporization is required, it is maintained at the boiling point under normal pressure. Therefore, the twisting torque of the water-containing single filament is apparently relaxed by twisting the crimp itself in a snarl shape without being thermally relaxed, and the yarn The overall apparent torque decreases, the bulkiness due to crimp increases significantly, and the elasticity also increases. Although the yarn obtained in this way has almost no unevenness in fineness under tension, under slight tension close to zero tension, the yarn has a thick part in its appearance in the longitudinal direction. Furthermore, since the thermal history of the treated portion is below the boiling point of water, there is no concern about uneven strength reduction in the longitudinal direction of the yarn. Furthermore, the swirlability of the entire yarn can be made comparable to ordinary reheat-treated processed yarn, and the workability during subsequent weaving and weaving is also good. Hereinafter, the present invention will be specifically explained with reference to Examples. Example 1 Ordinary polyester filament yarn 150 denier/48 filament was used as HN manufactured by Nippon Spindle Co., Ltd.
−8 False twisting was performed using a Type ₂ false twisting machine under the conditions shown in Table 1.
A trial yarn was produced under the subsequent processing conditions shown in Table 2. The processing method in Table 2 is as follows:
Water is sent to a pipe with an inner diameter of 2 mmφ and a U-shaped groove in the head between the delivery roller outlet and the second heater inlet, and the running yarn is applied to the water surface flowing out from the U-shaped part at the tip of the pipe. A crimped yarn was obtained in which the fibers were intermittently brought into contact with each other. In order to bring the traveling yarn into intermittent contact with the water surface, a prototype microcomputer is used to change the on-off cycle and time combination as appropriate, and a yarn guide is attached to the movable plate of the DC solenoid. Normally, the thread path is displaced and changed at random, but for experiments, it is set at regular intervals, and the water treatment time (seconds): normal processing time (seconds) is 0.01:5 (Test 1-1), 0.025:5.
(Test 1-2) and 0.25:0.25 (Test 1-3). Next, as a comparison with the yarn of the present invention, in Test 2, the reheat treatment conditions of Test 1-1 were changed from 230℃ to 160℃, and the relaxation rate was changed from 10% to 15%. The appearance of the fabric products was investigated by reducing the diameter ratio. Further, in Test 3, a normal relaxed heat-treated yarn was obtained without the hydrous treatment of Test 1, and in Test 4, a yarn subjected to the continuous hydrous treatment of Test 1 was obtained.

【table】

【table】

[Table] The results of investigating the conditions of the yarns obtained in each experiment were as follows. First, about 300 g (0.2 g/d) of tension was applied momentarily to the yarns of Tests 1 and 2, and then 0.15 g
The lengths of part A (thick thread part) and part B (thin thread part) were measured directly with a regular ruler under a load of (0.001g/d), and the average length was calculated five times each. The results are as shown in Table 2. The results show that the moisture retention time is proportional to the length of part A, and that the absolute value of the yarn length also closely matches the moisture retention time within the range of the shrinkage rate due to crimping. Next, we measured the outer diameter of the yarn under the same conditions as when measuring the lengths of parts A and B for each yarn in Tests 1 to 4 (under slight tension of 0.001 g/d after strong tension). Table 2 shows the results of measurements made with 10x magnification using a universal projector manufactured by Nippon Kogaku Co., Ltd. Part A is
Although there was a clear difference in apparent thickness between 1.35 and 1.63 cmφ and 0.38 and 1.15 cm for section B, test 2
The A/B was 1.2, which was low compared to other yarns. Note that the measured value of the apparent appearance of the yarn varies depending on the portion of the yarn being measured and the degree of the number of twists present. In particular, when the yarn is untwisted or lightly twisted (20T/M or less), the filaments that make up the yarn are diffused. It is often difficult to measure (or distinguish) the outermost diameter part. Therefore, in general, when measuring at a twist state of about 100 to 150 T/M, an appropriate focusing effect is achieved over the entire yarn, and reproducibility is achieved in measuring the outer diameter of thick parts.
If twisting is performed at 300 T/M or more, different phenomena occur in the yarn focusing effect depending on the direction of twisting, the number of twists, etc., so it is preferable that the number of twists is 150 T/M or less. Next, in order to measure the turning ability of the entire yarn, a load of 10 g (1/30 g/d) was suspended at the center of a 2 m long sample stretched horizontally, and when both ends of the yarn were brought together, the load rotated and stopped. When measuring the rotational speed Tt (T/M) when ×100%) ( σ : standard deviation value,
When compared, in yarn test 1 of the present invention,
A/B was 1.6 to 1.7 (60% to 70% increase), whereas A/B of the yarn of Test 2 was as low as 1.3. Measuring the torque of single filament
A 5 cm sample was untwisted in the S direction (same direction as false twisting) under a tension of 0.3 g (0.1 g/d) using an ordinary twister, and the distance between the samples was approximately 2.5 cm when there was no tension. The untwisting number Ti (T/M) until crimp twist no longer occurs was determined. Next, in order to investigate the substantial fineness unevenness of each yarn in Tests 1 to 4, we investigated the fineness unevenness under twisting and tension using a Zellweger Worcester under the measurement conditions shown in Table 3. % or less, and was at the same level as the value of the yarn used (1.75).

[Table] Next, regarding the crimp pitch of each yarn, 0.3g per single yarn.
We measured the number of crimps under a slight tension of about 0.001 g/d using the universal projector on a 5 cm sample under a tension of (0.1 g/d), and converted it to 1 m. , regardless of part B, the variation was within the range and there was no substantial difference. Next, a knitted fabric was prepared using a Motsuku Milano rib structure using a KJ-36 model knitting machine manufactured by Toyota Motor Corporation for each yarn of Tests 1 to 4, and finished by dyeing (moss green color) using a conventional method. However, on the surface of the fabric of Test 1, there were unique spots that were not seen on the fabrics of Tests 3 and 4, and the spots appeared to have a gentle thick spot that tended to be lighter in color, which was different from normal partial crimp spots. The mottled areas of the processed yarn showed a different tendency from the details which appeared to have a tendency to darken. On the other hand, when observing the yarn fabric in Test 2, the same signs as in Test 1 are observed when observed using transmitted light, but the effect is not so noticeable when judging the appearance using normal reflected light. Good results were obtained when the thick/fine ratio (A/B) of the yarn appearance based on the torque difference between the constituent single filaments was large to some extent. In addition, in Tests 1 and 2, the moisture retention time was periodic, so that the appearance of the product had noticeable and inconspicuous spots, but in Test 1, the moisture retention time and normal processing time were continuously set to 0.94, 5.90 ，
0.18, 9.00.0.68, 8.6, 0.95, 0.1, 0.31, 4.3,
0.55, 6.5, 0.93, 6.0, 0.77, 4.9, 0.62, 3.4,
0.13, 8.3, 0.62, 3.8, 0.55, 8.2, 0.27, 2.7,
0.82, 5.5, 0.38, 6.2, 0.83, 1.3, 0.34, 6.2,
0.49，7.7，0.60，9.3，0.65，5.5，0.43，3.1，
As a result of repeating the test at 0.01, 9.5, 0.86, 6.8, 0.90, 1.8, 0.59, and 9.4, the result was a natural patch with no periodicity at all.

[Brief explanation of the drawing]

Figure 1 is an external view of an example of the yarn of the present invention, Figure 2 is a schematic diagram of the crimp shape of a conventional partially crimped yarn observed under tension, and Figure 3 is the yarn of Figure 2 under slight tension. The schematic diagram observed below, Figure 4 is a schematic diagram of the crimp shape of Figure 1 (the yarn of the present invention) observed under tension,
FIG. 5 is a schematic diagram of the crimp shape of FIG. 4 observed under slight tension.

Claims (1)

[Scope of Claims] 1 A crimped yarn created by twisting strain of a thermoplastic synthetic fiber multifilament yarn, wherein the appearance of the yarn under no tension or under slight tension is thick and thin in the longitudinal direction; This is a special crimped yarn characterized by the fact that the single filament that makes up the threads has a larger turning ability in the thicker yarns than in the thinner yarns. 2 The unevenness of fineness in the longitudinal direction of the entire yarn under a tension of 0.05 g/d or more is 4% or less, and the apparent diameter ratio (thick yarn part/thin yarn part) of the entire yarn under a tension of 0.001 g/d or less The special crimped yarn according to claim 1, wherein the yarn part) is 1.5 or more. 3 There is no substantial difference in the number of crimps per unit length of the single filament that constitutes the yarn between the thick yarn section and the thin yarn section, and the ratio of swirlability under a tension of 1/30 g/d (thick section /fine thread portion) is at least 1.6 or more.
Special crimped yarn as described in section.