JPH0224934B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a specially processed yarn having strong twist effects such as a delicate silky feel, drapability, heavy feel, and elastic feel similar to a strong twist yarn. More specifically, untwisted parts and excessively untwisted parts exist alternately in the length direction of the yarn, and the untwisted part, which is the twisting direction changing part between the two twisted parts, has a length that substantially increases. Both the twisted portions are related to highly twisted specially processed yarns that have a low initial elastic modulus and a high twist density. Conventionally, there are many known methods for alternately forming untwisted portions and over-untwisted portions through false twisting, one of which is a steady false twisting operation.
The other one is due to unsteady false twisting operation. Among these, those using steady false-twisting operations include, for example, Japanese Patent Publication No. 47-49457, Japanese Patent Publication No. 51-225, Japanese Patent Publication No. 30818-1982, Japanese Patent Application Laid-open No. 98444-1984, Japanese Patent Publication No. 53-9844, Publication No. 98448, JP 52-66748
As can be seen in the publications, specific methods such as false twisting under high temperature that fuses the supplied yarn, false twisting under high temperature of low oriented yarn, fluid false twisting under high overfeed rate, etc. A technique has been proposed for producing an alternately twisted yarn having alternately untwisted portions and overtwisted portions by performing a steady false twisting operation under certain conditions. However, although the alternately twisted yarns obtained by these techniques all aim to have a texture similar to strongly twisted yarns, the lengths of the untwisted portions and overly twisted portions are moderate to 10 mm or less. In addition, there are more than 100 twisting direction changing parts per meter, and for this reason, rather than a strong twisting yarn-like feeling, the yarn has a strong bulging feeling, and only a rough texture with stiffness, jitteriness, and stiffness is obtained. Therefore, it was not possible to obtain an excellent strong twisting effect.
Furthermore, when undrawn yarn is stretched and false-twisted, a method is disclosed in JP-A-55-103330 in which the untwisting tension is lowered and untwisted yarn is generated by using a frictional false-twisting device having a yarn feeding action. Although it is described in Japanese Patent Application Laid-open No. 55-69025, the length can only be obtained from several millimeters to several centimeters at most, and for this reason, the twist direction conversion part is There are more than 10 pieces per meter.
When tensile stress or bending stress is applied to the untwisted or excessively untwisted parts, the stress becomes shear stress along the strands, causing slippage between the strands, giving the fabric drapability and weight. However, if there are many twist direction converting parts, tensile stress and bending stress are not converted into shear stress that causes the strands to slide, making it impossible to obtain drapability or a sense of weight. In order to impart drapability and a sense of weight to the fabric, the frequency of twist conversion parts must be 2 pieces/m or less. On the other hand, examples of methods using active unsteady false-twisting operations include, for example, Japanese Patent Publication No. 1983-3900;
Publication No. 50673, Japanese Patent Publication No. 1973-34016, Japanese Patent Publication No. 1973
Techniques for varying the propagation of twist generated by a false twisting device, such as those found in Japanese Patent Publication No. 554 and Japanese Unexamined Patent Publication No. 1984-121546, and Japanese Patent Publication No. 49-8414 and Japanese Patent Application Laid-open No. 49-108353. Publication, JP-A-51-49949
The technique of varying the number of twists of the yarn generated by a false twisting device as seen in Japanese Patent Application Publication No. 53-61745, as well as Japanese Patent Publication No. 51-222,
Techniques for varying the speed of yarn passing through a false twisting device are known, as disclosed in Japanese Patent Application Laid-open No. 49-92337 and Japanese Patent Application Laid-Open No. 49-92354. These processing techniques using unsteady false twisting operations utilize the transient phenomenon of twist propagation, and unlike the above-mentioned alternating twisted yarns using steady false twisting operations, the lengths of untwisted and over-untwisted portions are Although it is possible to form alternately twisted yarns of up to 1 to 2 m, they all have non-twisted portions of considerable length,
Moreover, the twist density of the untwisted portion and the overtwisted portion is low, and therefore the high degree of strong twisting effect that the present invention aims at cannot be achieved. In order to improve the conventional alternately twisted yarn, the present inventors have grasped the phenomenon of alternating twisted yarn formation in unsteady false twisting operation and investigated the principle. By adding and compounding, the twisting effect is synergistically enhanced, there is virtually no twisting part, which has not been achieved conventionally, and the initial elastic modulus of the twisted yarn structure is reduced, improving drapability. The present invention was achieved based on the discovery that alternately twisted yarns having an increased high degree of strong twisting effect can be obtained. That is, the present invention has a twist number distribution in the longitudinal direction of the yarn, and the filaments are not fused together.
A yarn in which untwisted portions with an average length of 500 mm or more are twisted in the false-twisting direction and over-untwisted portions with an average length of 500 mm or more and twisted in the false-untwisted direction are alternately formed. The untwisted part shows a chevron-shaped distribution curve, while the over-twisted part shows a trapezoidal distribution curve, and the average number of twists is 8000/√
(T/M) or more, there is substantially no untwisted part where the twisted yarn structure has collapsed in the twist direction conversion part, and the untwisted part and the overly untwisted part have an initial elastic modulus of 40 g/d or less. This is a specially processed yarn with a strong twist. Hereinafter, the specific contents of the present invention will be explained in more detail. First, the processed yarn of the present invention is substantially free of untwisted portions in which the twist structure is disrupted in the twist direction changing portions. Here, the untwisted part in which the twist structure has collapsed in the twisting direction conversion part refers to the untwisted part in the part where the untwisted part changes to the over-untwisted part or from the over-untwisted part to the ununtwisted part. This refers to a portion where the twisted yarn structure collapses due to the cancellation of the twists between the untwisted portion and the over-untwisted portion, resulting in a non-twisted state or a low twist number state, and “substantially absent” refers to a portion where the untwisted portion is in the present invention. It refers to the degree of twisting that does not reduce the desired high degree of strong twist effect, specifically the number of twists.
The part below 100T/M is less than 2cm, the majority is 1cm
This refers to cases where the portion is less than 2% of the repeat length of the yarn. It is an important condition for obtaining a fabric with a strong twist effect that the yarn has a high twist density and substantially no untwisted portion is present in the yarn; Then, the silky feel disappears and it becomes more like bulky fabric. Conventionally, in processing techniques using unsteady false-twisting operations, attempts have been made to reduce the number of untwisted parts by setting the period of unsteady false-twisting operations within a time period in which steady false-twisting parts do not appear. With these processing techniques, it is not possible to obtain an alternately twisted yarn with a high twist density and substantially no untwisted portions. The processed yarn of the present invention is produced by the manufacturing method described below, and has an excellent strong twisting effect because the formed untwisted portions and excessively untwisted portions are not easily collapsed, and therefore there is substantially no untwisted portion. It is something that plays. Figures 1a, b and 2 are side photographs and schematic side views of the processed yarn of the present invention, and Figure 1a is a non-twisted part in the twist conversion part from the untwisted part to the over-twisted part. , FIG. 1B shows a non-twisted portion in a twist conversion portion from an over-twisted portion to an untwisted portion. In addition, FIG. 2 is composed of an untwisted part A and a slightly bulky over-twisted part C, and a non-twisted part B and The untwisted portion D in the twist transition portion between the over-untwisted portion C and the subsequent untwisted portion A is shown to be substantially non-existent. Next, the average length of both the untwisted part and the overly untwisted part in the processed yarn is 500 mm or more, and the initial elastic modulus is 40 g/d or less. The drapability of a knitted fabric is related to the initial elastic modulus of the yarn, and when the initial elastic modulus of the yarn is 40 g/d or less, the resulting fabric has drapability, but in conventional alternately twisted yarn, None of them has attempted to improve the drapability of a fabric by reducing its initial elastic modulus. As described later, the processed yarn of the present invention has an initial elastic modulus of 50% or less of that of the raw yarn, for example, 30% in the case of polyester filament yarn.
g/d or less, 20 for nylon filament yarn
g/d or less, and therefore, excellent drape properties can be imparted to the knitted fabric. FIG. 3 is a graph showing the relationship between the untwisted portion and over-twisted portion of the processed yarn of the present invention and the initial stress and elongation of the supplied raw yarn. The initial elastic modulus is the following formula ()
It corresponds to the initial tensile resistance (g/d) described in JIS L-1013. Initial elastic modulus (g/d) = P/(l'/l) x d...(
) However, P: Load (g) when the sample is stretched at elongation l' d: Thread fineness (denier) l: Sample length l': Amount of elongation when the sample is stretched The above formula () is , the stress value obtained by extending the straight line of the initial slope of the stress-elongation curve and dividing the stress value when the elongation of this straight line is 100% by the fineness. The initial elastic modulus of the supplied yarn I shown in Figure 3 is 95g/
d [When the elongation is 3.16%, the stress is 3 g/d, ()
According to the formula, 3/(3.16/100) = 95 g/d], whereas the initial elastic modulus of the untwisted part B of the processed yarn of the present invention is 27 g/d [when the elongation is 11.1%, the stress is 3 g /d, and from formula (), 3/(11.1/100)=27g/
d], the initial elastic modulus of the over-twisted part C is 20 g/d [elongation
At 15.0%, the stress is 3 g/d, and from formula (), 3/(15.0/100) = 20 g/d], and it can be seen that the initial elastic modulus is low in both the untwisted part and the over-untwisted part. Next, the method and principle for manufacturing the specially processed yarn of the present invention will be explained. First, regarding the formation of the non-twisted part of conventional alternately twisted yarn, we will explain the case of false twisting by intermittent fluid twisting. By passing fluid through the nozzle intermittently, the yarn is repeatedly wound and stopped, and the yarn is processed using the transient phenomenon of false twisting. In this case, an untwisted part is formed when the fluid stops, and an overtwisted part is formed when the fluid is supplied.
And between the untwisted part and the over-twisted part, there is a non-twisted part B.
A non-twisted portion D is formed between the over-untwisted portion and the following untwisted portion. The formation of the non-twisted portion B will be explained using FIG. 5. 1 in FIG. 5 shows a state in which the supply of fluid to the nozzle is stopped and an untwisted portion A is formed. Next, as shown in 2 in FIG. 5, when the supply of fluid to the nozzle is started, the untwisted portion A of the yarn in the untwisting zone starts to be untwisted sequentially from the vicinity of the nozzle, but the untwisted portion A is strongly twisted and firmly fixed, and this untwisting action does not lead to over-untwisting.
This is because the untwisted portion A is only untwisted, resulting in a non-twisted portion B. 3 in FIG. 5 is a diagram showing the formation of the over-twisted portion C after this. Next, the formation of the non-twisted portion D will be explained using FIG. 6. 1 in FIG. 6 shows a state in which fluid is supplied to the nozzle and an over-twisted portion C is formed.
Next, as shown in 2 in Fig. 6, when the supply of fluid to the nozzle is stopped, the yarn in the untwisting zone centering on the twisting part near the nozzle is in the over-twisting part C and in the twisting zone. The yarn becomes an untwisted part A, but becomes an untwisted part D because the torque of these twisted parts having different directions cancels each other's twists. 3 in FIG. 6 is a diagram showing the subsequent formation of the untwisted portion A. Therefore, in order to prevent the formation of untwisted parts in alternately twisted yarn, first, regarding the untwisted part B, the untwisted part A in the untwisted zone in the untwisted zone is easily over-untwisted at once when fluid is supplied to the nozzle. It is necessary that the untwisted portions D be firmly untwisted so that they will not be untwisted by the torques of the twisted portions in different directions. However, this requires contradictory characteristics in that the untwisted part is easy to untwist on the one hand and difficult to untwist on the other hand, and there is a problem that such a contradiction must be resolved in order to prevent the untwisted part. Ta. The present inventors have carefully observed the false-twisting transient phenomenon in the above-mentioned false-twisting process, and as a result of conducting various experiments, the inventors have solved the above-mentioned problem by applying a specific processing operation to the conventional technology, and the non-twisted part is It has been found that the specially processed yarn of the present invention can be obtained by preventing the formation of the yarn. That is, in order to produce the specially processed yarn of the present invention, for example, in the false twisting process using a nozzle, a roller having a variable speed function in conjunction with supplying and stopping fluid to the nozzle is used as a supply roller, and By threading the yarn at a predetermined high overfeed rate and increasing the speed of the variable speed roller simultaneously with the supply of fluid to the nozzle, the yarn runs at a higher overfeed rate and thus prevents ballooning in the untwisting zone. Twist along with it. This state will be explained using FIG. 7. 1 in FIG. 7 shows a state in which the supply of fluid to the nozzle is stopped and an untwisted portion A is formed. Next, as shown at 2 in FIG. 7, fluid supply to the nozzle is started, and when the yarn is over-supplied, ballooning in the untwisting zone causes the nozzle and delivery roller to move to the node part of the string vibration ( Since the untwisted part A in the untwisting zone vibrates as a node), the untwisted part A in the untwisting zone is not unraveled sequentially from the vicinity of the nozzle to the delivery roller part by the propagation of twist, but by the string vibration. The untwisted part A near the delivery roller is loosened and becomes easier to untwist, so the twist of the yarn reaches the delivery roller all at once, and the untwisted part A in the untwisting zone is over-untwisted. As a result, the formation of the non-twisted portion B is prevented. In this case, unlike a mechanical false-twisting spindle, the twisting device uses a high-pressure fluid jet, so stable false-twisting is possible even when the speed of the variable speed roller is increased. In addition, as the amount of overfeed increases, the amount of twisting of the yarn increases, so the twist during twisting when fluid is supplied becomes double twist or semi-double twist, which enables high density twisting and high The number of twists of the density can be left in the processed yarn. The twist state during this twisting is double twist or semi-twist.
Heavy twisting has the advantage that the length of the yarn after untwisting is significantly longer than in the case of false twisting, which does not form a double twist, so it increases the ballooning of the yarn during twisting. be. Furthermore, since the textured yarn obtained in this way has a high number of twists, the elongation stress component changes to shear slip stress during elongation, exhibiting a high elongation strain with respect to the initial low stress, and the initial elasticity of the textured yarn changes. The rate can be significantly reduced to less than 50% of that of the supplied yarn. In this way, the formation of non-twisted portions B can be prevented and the initial elastic modulus of the processed yarn can be set to 40 g/d or less. After the fluid is supplied to the nozzle as described above, the fluid supply is then stopped, and at the same time the fluid supply is stopped, the speed of the variable speed roller is reduced. This state will be explained using FIG. 8. 1 in Figure 8 is
A state in which fluid is supplied to the nozzle and an over-twisted portion C is formed is shown. Next, as shown in 2 in FIG. 8, the supply of fluid to the nozzle is stopped, and at the same time, the yarn supply speed is reduced, so that the yarn running at a high overfeed rate becomes slack.
In addition to preventing the thread from becoming unable to run due to winding around the rollers, it also prevents excessive tension in the running thread from decreasing and keeping it at a predetermined tension. The twist of the twisted portion C can be brought close to the untwisted portion A beyond the twist change point.
In this case, since the yarn twisting has stopped, the predetermined tension must be sufficiently lower than the yarn tension during twisting, and thus the untwisted portion will be heat treated in a low tension state. A strong twisted portion that has a high heat receiving effect and is difficult to untwist can be formed. 3 in FIG. 8 is a diagram showing the subsequent formation of the untwisted portion A. In this way, the untwisted part A is made into a strong twisted part, and the untwisted part D is formed by bringing the twist of the overly untwisted part C in the untwisted zone close to the untwisted part A. can be prevented. In this way, a processed yarn of the present invention is obtained in which there is substantially no untwisted part and the initial elastic modulus of the untwisted part and the overly untwisted part is 40 g/d or less. In addition, in the false twisting process using a nozzle, the specially processed yarn of the present invention uses a passive yarn feeding device (hereinafter referred to as feeder) that rotates by the running tension of the yarn as a yarn feeding device to supply fluid to the nozzle. It can also be manufactured by linking the opening and closing of the fluid supply valve and changes in the load on the feeder using electrical signals, such that the load is sometimes low and the load is high when the fluid supply is stopped. That is, in this case,
First, the yarn is run at a predetermined high overfeed rate, and at the same time as fluid is supplied to the nozzle, the load on the feeder is made light so that the yarn in the untwisting zone turns with ballooning. Ballooning in this untwisting zone causes the nozzle and delivery roller to vibrate as nodes of string vibration, which loosens the untwisted parts near the delivery roller and makes it easier to untwist the yarn. The twisting reaches the delivery roller all at once, forming an over-untwisted portion, and the formation of a non-twisted portion B can be prevented. In addition, in this case, unlike the normal twisted state, the yarn in the twisting zone forms a double twist or a quasi-double twist, so the obtained alternately twisted yarn has a high twist density. Its initial elastic modulus is reduced to 50% or less of that of the supplied yarn. Next, at the same time as the supply of fluid to the nozzle is stopped, the load on the feeder is changed to a high load to prevent the yarn from being unable to run due to the extremely low tension due to the stop of yarn twisting, and to prevent the yarn from being able to travel. By maintaining the tension, the twist in the over-untwisted portion in the untwisting zone can be brought close to the untwisted portion beyond the twist change point. In this case, the predetermined tension is sufficiently lower than the yarn tension during twisting in order to stop the yarn twisting, and therefore, when the fluid supply is stopped, the untwisted part is heat-treated under low tension and the heat receiving effect is The increased twisting results in a strong twisted part that is difficult to untwist. In this way, the untwisted part becomes a strong twisted part, and the formation of the untwisted part D can be prevented by bringing the twist of the front excessively untwisted part close to the untwisted part. can. Thus, the specially processed yarn of the present invention can also be obtained by the above processing operations. The nozzle used in the production of the above-mentioned processed yarn of the present invention may be any nozzle as long as it has the function of turning the yarn at high speed and giving it twist. Any combination of fluid conduits or fluid conduits positioned substantially in the tangential direction relative to the inner periphery of the thread passageway may be used. Alternatively, the fluid conduit may lie in a plane substantially perpendicular to the longitudinal axis of the thread passageway, or may be otherwise inclined from the perpendicular plane so as to impart an advancing action to the thread. preferable. It goes without saying that the method for producing the processed yarn of the present invention is not limited to the method described above. The specially processed yarn of the present invention obtained by performing the special processing operations as described above exhibits a characteristic twist number distribution in the untwisted portion and the overtwisted portion. That is, normally, the maximum number of twists in the untwisted part and the overtwisted part differs depending on the time to form both the twisted parts, but in the processed yarn of the present invention, the maximum number of twists in the untwisted part and the overtwisted part differs depending on the time for twisting the yarn by fluid supply. Even if the twisting stop time due to fluid supply stoppage is the same, the maximum number of twists in the untwisted part is the same as shown in Figure 4.
T ₁ Max (when fluid supply is stopped) is always larger (T ₁ Max>T ₂ Max) than the maximum number of twists T ₂ Max (when fluid is supplied) in the over-twisted portion. Here, the maximum number of twists is 1 cm of yarn alternately twisted along the longitudinal direction of the yarn.
The number of twists per meter is measured using a twister or microscope, and is converted into the number of twists per meter. The reason for this is that even if the fluid supply time and the fluid supply stop time are equal, the actual amount of yarn fed is greater when the over-untwisted section is formed, so the yarn length at the over-untwisted section is longer;
In addition, when fluid is supplied, the untwisted part in the untwisting zone is made into an over-untwisted part all at once, so the over-untwisted part becomes longer, so the average number of twists per unit length of the over-untwisted part becomes untwisted. This is because the amount is smaller than that in the untwisted part. Further, as shown in FIG. 4, the twist number distribution is shaped like a chevron-shaped distribution curve in the untwisted portion, while a trapezoidal distribution curve in the over-twisted portion. That is, in the untwisted part, the yarn twisted when fluid is supplied passes through the nozzle without being untwisted when the fluid supply is stopped, while in the overly twisted part, the thread is formed when fluid is supplied and is in the twisting zone. In the untwisting zone, the twisted material is over-untwisted in excess of the twisting in the twisting zone. Therefore, theoretically, both the untwisted part and the overtwisted part should exhibit a mountain-shaped distribution curve with the maximum value expressed by the exponential relationship, but in the case of the processed yarn of the present invention, as mentioned above, the special The untwisting situation when fluid is supplied for processing operations is different from the above case, and the shape of the twist number distribution in the over-untwisted portion is trapezoidal. The twist density of the untwisted part and overtwisted part of the specially processed yarn of the present invention must be 8000/√(T/M) for the twisting effect to have a significant effect on the texture.
(D; Fineness) or more is required. Also,
From the point of view of strong twist effect, the average length of both twisted parts is 500 ~
2000 mm is effective, and the ratio of the length of the over-twisted portion to the length of the untwisted portion is effective to be in the range of 1:4 to 4:1. Note that the average number of twists herein refers to the number of twists distributed in each twisted portion, measured using a twister or a microscope, averaged, and converted into the number of twists per 1 m. The thermoplastic synthetic fibers in the processed yarn of the present invention include synthetic fibers obtained from polymers such as polyester and polyamide, and copolymers and blend polymers thereof. As described above, the specially textured yarn of the present invention has the above-mentioned structure by applying a specific processing operation to the conventional false twisting process, and therefore has the following unique effects. In other words, the specially processed yarn of the present invention has an untwisted part and an overly untwisted part with a high twist density that are on the order of a meter in length, so it can give a silky feel, and moreover, the yarn is thinner in both the twisted parts. Combined with the ease of sliding between the threads, it is possible to give a delicate and silky feel. In addition, the processed yarn of the present invention has substantially no untwisted portions, and is thinned and concentrated due to the high twist density of the untwisted portions and overtwisted portions, so that it has bulky untwisted yarn. The thickness of the resulting fabric is thinner than that of processed yarn in which there is a part, giving it a feeling of weight. Furthermore, since the processed yarn of the present invention has a low initial elastic modulus of 40 g/d or less in the untwisted part and the overtwisted part, it is possible to not only impart drapability to the fabric obtained, but also In addition to having a high twist density, it is possible to obtain a fabric that has good flexibility and elasticity. Furthermore, since the processed yarn of the present invention is highly twisted, the yarns in the woven or knitted fabric do not become flat, and the contact area at the intersecting points of the yarns in the woven or knitted fabric becomes small, which makes it easy for the threads to slip and improve drapability. The processed yarn of the present invention provides a novel processed yarn that could not be obtained with conventional alternately twisted yarn. The present invention will be explained below using examples. Example 1 Polyester filament 75d/48f (triangular cross-sectional shape, bright yarn) and polyester filament
50d/24f (circular cross-sectional shape, black thread mixed with carbon)
The yarns were aligned (initial elastic modulus: 95 g/d) and fed to a false twisting process using a nozzle, and processed under the processing conditions shown in Table 1 to obtain processed yarns shown in Table 2.

【table】

[Table] The obtained processed yarn is as shown in the photograph in Figure 1.
There was only a twisting direction change point, and no substantial length was observed in the non-twisted portion. This processed yarn has a warp density of 93
The fabric is woven using two wefts alternately at a weft density of 60 threads/inch and a weft density of 60 threads/inch.This fabric is subjected to a normal polyester alkali weight loss process (17% weight loss) and dyed (brown color).
When finished, the black and dark brown strands created by alternating the directions of twisting created a unique striped pattern, resulting in a delicate silkiness, drapability, and weight similar to that of highly twisted yarn. A woven fabric with an excellent feel and elasticity was obtained. Example 2 Polyester filament 75d/24f (circular cross-sectional shape, semi-dull yarn, initial elastic modulus 90 g/d) was used as a yarn feeding device, and a feeder capable of electromagnetically varying the load, a nozzle, a first delivery roller, and a relaxation heat treatment were applied. It is supplied to a processing process consisting of a second heater, a second delivery roller and a winding device, and a third
Processing was carried out under the processing conditions shown in the table to obtain processed yarns as shown in Table 4.

【table】

[Table] The length corresponding to the number of twists of the obtained processed yarn is 100T/M or less is 0.9 cm at the part where the twist direction changes from the untwisted part to the overtwisted part, and the length corresponding to the twist number of 100T/M or less is 0.9cm at the part where the twist direction changes from the untwisted part to the overtwisted part. The length at the part where the twisting direction changes to the twisting part is 0.6cm, and the ratio of these two processed yarns per cycle length is 0.7%.
It was hot. When this processed yarn is knitted into a cotton jersey texture with 36 gauge single knot, dyed and finished, it has an excellent strong twist effect with a delicate silky feel, drapability, weight and elasticity. A knitted fabric with a nice texture was obtained.

[Brief explanation of drawings]

Figures 1a and b are side photographs of the processed yarn of the present invention (6x magnification); Figure 2 is a schematic side view of the processed yarn of the present invention;
Fig. 3 is a graph showing the relationship between the initial stress and elongation of the untwisted part, the over-twisted part, and the supplied raw yarn of the processed yarn of the present invention, and Fig. 4 is an explanation showing the twist number distribution of the processed yarn of the present invention. It is a diagram. Furthermore, FIGS. 5 and 6 are explanatory diagrams of the formation of non-twisted parts B and D when the yarn supply speed is not variable, and FIGS. 7 and 8 are illustrations of the formation of the non-twisted portions B and D when the yarn supply speed is not variable. It is an explanatory view for manufacturing processed yarn of the present invention by changing speed. A... Untwisted part, B... Untwisted part in the part where the twisting direction changes from the untwisted part to the over-twisted part, C... Over-twisted part, D... Untwisted from the over-twisted part T ₁ Max...Maximum number of twists in the untwisted part, T ₂ Max...Maximum number of twists in the overtwisted part.

Claims (1)

[Claims] 1 The number of twists is distributed in the longitudinal direction of the yarn, the filaments are not fused to each other, and the untwisted part has an average length of 500 mm or more and is twisted in the false twisting direction, and the untwisted part has an average length of 500 mm or more. This is a yarn in which over-twisted parts with twists in the false-twisting and untwisting directions are formed alternately, and the twist number distribution shows a mountain-shaped distribution curve, whereas The twisted portion shows a trapezoidal distribution curve, and the average number of twists is 8000/√(T/M) or more,
A strong twist characterized in that there is substantially no untwisted part in which the twist structure is collapsed in the twisting direction conversion part, and the untwisted part and the excessively untwisted part have an initial elastic modulus of 40 g/d or less. Specially processed yarn.