JPS6261692B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention provides jet and multifilament yarns.
The present invention relates to a partially bulky yarn obtained by agitation treatment using a nozzle (compressed turbulent fluid injection device). More specifically, the present invention relates to a partially bulky yarn having loops, tangles, or slack, and consisting of a tightened bulky portion and a non-bulky portion. In recent years, fabrics made from synthetic fiber multifilament yarns have become extremely important in clothing because of their excellent properties such as wash-and-wear properties and wrinkle resistance. However, even fabrics made from these functionally excellent filament yarns are disliked due to their cold appearance and waxy feel, and in particular, the uniformity of filament yarns gives the fabrics a faceless quality, which is why they are not liked. Recently, there has been a strong desire to develop a method for producing filament yarns that eliminate the uniformity of such multifilament yarns, that is, have yarn irregularities, slabs, nep, etc. in the longitudinal direction of the yarns. On the other hand, as a method for improving the shortcomings of filament yarns such as uniformity, partially bulky yarns utilizing the disturbance effect of jet nozzles have been known. For example, yarn is continuously fed into a jet nozzle, impinged on a porous surface with a high-velocity jet, entangled and drawn out at a speed slower than the yarn feed rate, and then treated with fluid to slub yarn. The method for forming a multifilament yarn is to intermittently form loops while applying overfeed to the multifilament yarn, wrap the loops with a fluid jet to form a band, and then entangle the band in parallel with the yarn. from a core thread fed under relatively high tension and a entwined thread fed under relatively low tension, operating with varying operating medium pressures and slightly damped at lower medium pressures. In the case of high medium pressure, there is a method of forming decorative threads without braking. However, the shape of the fancy yarn obtained by these methods is due to the bulking effect of the jet nozzle, and the protruding loops, tangles, or sag due to overfeeding are simply bulky, and when knitted into a fabric, it will not appear on the surface. The fuzz of the loops etc. in the relevant part will be in a state of protrusion,
Rather, it could only be considered a drawback. Furthermore, the confounding of non-bulky areas is relatively poor;
This made it difficult to handle the yarn. For example, since the bulky portion is perpendicular to the yarn axis direction, it protrudes from the surface of the cheese, causing poor unraveling or yarn breakage, which causes the weaving and knitting machine to stop, reducing workability. In addition, when the running yarn passes through a guide etc. during knitting, the bulky part is rubbed and shifts, etc., and the shape of the bulky part is evaluated as a defect. is lost. Furthermore, the partially bulky yarn produced by feeding two yarns at different surface speeds from two feeding rollers has a lower strength per denier because stress is applied to the yarn with a smaller amount of feed. It has the disadvantage of being low. The present invention improves such conventional drawbacks, and when used in woven or knitted fabrics, it has excellent unwinding properties, heatherability, yarn strength, and shape stability, so that it can significantly exhibit a thickening effect. An object of the present invention is to provide a method for manufacturing bulky yarn, and to achieve this object, the present invention has the following configuration. That is, the present invention provides a processing method in which bulkiness is imparted to at least one multifilament yarn by producing a large number of loops, entanglements, or slacks using a compressed turbulent fluid injection device (jet nozzle). Bulky parts with many loops, tangles, or slacks are alternately formed in the longitudinal direction of the yarn, and non-bulky parts with almost no loops, tangles, or slacks are formed alternately, and then the back yarn is twisted with a number of twists that satisfy the following formula: This is a method for producing partially bulky yarn, which is characterized by additional twisting or combined twisting with yarns of the same or different types. (However, T indicates the number of twists T/M, and D indicates the total denier.) Here, the term "combined twisting with yarns of the same or different types" refers to the above-mentioned yarns or other thermoplastic polymer fibers, recycled fibers, Refers to the combination and twisting of filament yarns such as cellulose fibers and natural fibers or spun yarns. The present invention will be explained in more detail below. The partially bulky yarn used in the method of the present invention can be obtained by the steps shown in FIGS. 1 and 2, for example, by utilizing the agitating action of a jet nozzle. In FIG. 1, a multifilament yarn 1 is supplied via a supply roller 2 to a jet nozzle 3 and a swirl nozzle 4, taken up by a take-off roller 5, and sent out to the next process. Here, pressurized fluid is intermittently supplied to the swirl flow nozzle 4, and the yarn 1 between the supply roller 2 and the swirl flow nozzle 4 is intermittently given false twist. Therefore, the part of the yarn 1 that is not strongly twisted due to false twisting becomes a bulky part with loops, tangles, or slack, and the part that is highly twisted by false twisting is a non-bulky part that does not have loops, tangles, or slack. A partially bulky yarn is obtained in which bulky parts and non-bulky parts are alternately formed in the longitudinal direction of the yarn. FIG. 2 shows another embodiment in which the multifilament yarns 1, 1' are simultaneously fed to the jet nozzle 3 by supply rollers 2, 2' with different surface speeds, taken up by a take-off roller 5, and then It is sent to the process. The yarn 1' is always running at a constant supercharging rate by a supply roller 2' and a take-off roller 5. A negative pressure suction device 6 and a yarn resistance device 7 are provided in this order in the yarn path between the supply roller 2 and the jet nozzle 3 for the yarn 1, and the yarn resistance device 7 intermittently acts on the yarn 1. It operates as if it provides resistance. When resistance is applied to the yarn 1 by the yarn resistance device 7, the yarn becomes slack between the supply roller 2 and the yarn resistance device 7, and the slack yarn is transferred to the inlet end A of the negative pressure suction device 6. , B, it stays in the negative pressure suction device 6 and forms yarn paths A, C, and B.
Next, when the resistance of the yarn resistance device 7 is released, the retained yarn 1 is supplied, and the oversupply to the jet nozzle 3 is temporarily increased to form a thick yarn portion locally. Thus, by intermittent operation of the yarn resistance device 7, a partially bulky yarn in which bulky portions and non-bulky portions are alternately formed in the longitudinal direction of the yarn is obtained. By the way, the non-bulky portion of the partially bulky yarn obtained by the above method has a low degree of entanglement and lacks convergence, and the bulky portion is formed by loops, tangles, slack, etc. that protrude at right angles to the yarn axis direction. and
For this reason, the shape of the part is simply swollen randomly, and the appearance of the knitted fabric is significantly impaired. Furthermore, when used in a knitting machine, the unwinding property is poor, and even the addition of a slight excessive tension during the preparation process may lead to yarn breakage in non-bulky areas. The method of the present invention is capable of twisting a partially bulky yarn obtained using a jet nozzle, which has a poor shape and is difficult to handle, or with yarn of the same type or a different type, which satisfies the conditions described later. It is characterized by applying a combination of twists. Thus, the present invention fixes the bulky part of the partially bulky yarn, suppresses the protrusion of the loop to form a spindle shape, and converges the poorly intertwined non-bulky part to make the bulky part and the non-bulky part more distinct. It increases the strength and makes handling easier, and the yarn form does not change even under tension during weaving, and when it is made into a woven or knitted fabric, it can give a good appearance with natural spots on its surface. It is possible to obtain great effects. In the method of the present invention, the number of twists T of the additional twist added to the partially bulky yarn obtained using the jet nozzle or the combination twist with the same type or different type of yarn must satisfy the following formula. (However, T indicates the number of twists T/M, and D indicates the total denier.) As the number of twists for additional twisting or combined twisting.

When [Formula] is adopted, none of the above effects can be obtained because the number of twists is insufficient. i.e.

In the case of the number of twists in [Formula], the number of twists is almost concentrated only in the details of the non-bulky part, and the twist is not added to the boundary between the bulky part and the non-bulky part, and as a result, the bulky part does not become spindle-shaped. Furthermore, the loops and the like remain protruding, and the number of twists is insufficient for converging bulky parts, so it is not possible to improve the unwinding property or increase the strength of the yarn. The unique effect obtained by additional twisting or combined twisting of the partially bulky yarn in the method of the present invention, in particular, the bulky portion where the yarn is simply swollen or has protruding loops, etc. changes into a spindle-shaped tight shape, making it more The present inventor believes that the reason why the bulky portion becomes clear is as follows. In other words, the partially bulky yarn to be subjected to additional twisting or combined twisting alternately has bulky parts, that is, thick parts, and non-bulky parts, that is, details, in the longitudinal direction, and when twisting is added to the yarn, the twisting takes priority over the details. The details are tightened more finely, and then the boundary between the thick part and the details becomes a part with a lot of twist, and the thick part also has less twist. For this reason, the focusing effect of the twist becomes non-uniform along the longitudinal direction, and the non-bulky part becomes extremely narrowly focused, and then the boundary between the bulky part and the non-bulky part becomes convergent, and the shape of the bulky part becomes spindle-shaped. The protruding loops of the bulky part are shaped by loose twisting. Therefore, the focusing effect of the bulky portion is relatively small, and a sufficiently thick bulky portion can be obtained. In addition, since the shape is adjusted by twisting in one direction, the yarn shape does not change even under tension during weaving and weaving, and has a stable structure. In addition, the non-bulky parts of partially bulky yarns obtained by simultaneously processing two or more groups of multifilament yarns with different dyeability using a jet nozzle are relatively poorly entangled, and especially when dyed in different colors, the heathering of the concerned parts is poor. When made into a fabric, it appears as streaks and lacks marketability.Therefore, conventionally, when manufacturing partially bulky yarn, it has rarely been possible to simultaneously process different dyeing multifilaments. However, by applying additional twisting or combined twisting of the method of the present invention to partially bulky yarns using heterochromatic multifilaments, it is possible to improve the heathering properties of the non-bulky parts.Examples will be explained below. do. Example 1 Processing was performed according to the processing steps shown in Fig. 1 under the conditions shown in Table 1, and the length as shown in Fig. 3 was obtained.
A partially bulky yarn was obtained which alternately had bulky parts a of 0.5 to 0.8 m and non-bulky parts b of 0.8 to 5 m in length. Note that the intermittent supply of pressurized air to the swirling flow nozzle will depend on the supply time.
The supply stop time was randomly varied in the range of 0.1 to 1 second with an average of 0.3 seconds, and the supply stop time was varied in the range of 0.1 to 0.2 seconds with an average of 0.15 seconds. The partially bulky yarn thus obtained is processed by a ring twisting machine.
Actual twisting of 500T/M was applied. The obtained yarn has a non-bulky part as shown in Figure 4.
b' is well focused, the boundary between bulky part a' and non-bulky part b' has a natural spindle shape, and bulky part a' and non-bulky part b' are more clearly defined. Even when the machine was used, the unwinding properties were excellent, the bulky part b' did not slip easily, and the machine did not stop. In addition, the obtained fabric had contradictory textures such as strong twist-like smoothness and flexibility, and had a richly varied uneven surface effect, and had an excellent appearance.

[Table] Example 2 In Fig. 2, processing was carried out according to the processing steps shown and under the conditions shown in Table 2, and the resistance imparted to the yarn 1 by the yarn resistance device 7 was determined by the resistance imparting time. 0.1~0.2
Resistance release time is 0.15 seconds on average in the second range.
The time was varied randomly within the range of 0.1 to 0.15 seconds so that the average time was 0.13 seconds, and a partially bulky yarn was obtained. The obtained partially bulky yarn alternately has bulky parts with a length of 8 to 15 cm and non-bulky parts with a length of 40 to 80 cm, and two of these partially bulky yarns are pulled together and twisted by a ring twisting machine.
It was combined and twisted with a number of twists of 850T/M. The yarn obtained was thick in the overlapping part of the bulky part and had a spindle shape with a natural taste, and the non-bulky part was well tightened and had good unwinding properties. This combined twisted yarn is woven into fabric and dyed in a unique color, which combines the contradictory textures of strong twisting and softness, and has a richly varied surface effect. It was very good and no streaks appeared.

【table】 [Brief explanation of the drawing]

1 and 2 are process explanatory diagrams showing a method for manufacturing a partially bulky yarn applying the method of the present invention, and FIG. 3 is a schematic diagram of the external appearance of the partially bulky yarn before applying the method of the present invention, FIG. 4 is a schematic diagram of the appearance of a partially bulky yarn obtained by the method of the present invention. 1, 1'... supply yarn, 2, 2'... supply roller, 3... jet nozzle, 4... swirl flow nozzle, 5... take-up roller, 7... yarn resistance device,
6... Negative pressure suction device.

Claims (1)

[Claims] 1. A compressed turbulent fluid injection device (jet nozzle) for at least one multifilament yarn.
In a processing method that gives bulkiness by creating a large number of loops, tangles, or slack,
Bulky parts having many loops, tangles or slacks and non-bulky parts having almost no loops, tangles or slacks are alternately formed in the longitudinal direction of the resulting yarn, and then the yarn satisfies the following formula: A method for producing a partially bulky yarn, which comprises additionally twisting the yarn to a number of twists or combining yarns of the same or different types. (However, T indicates the number of twists T/M, and D indicates the total denier.)