JPS6342012B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a twisted yarn made by twisting together a plurality of bundled spun yarns in which a small number of wrapped fibers are wound and bound around a core fiber bundle with no twist. More specifically, the present invention relates to a twisted yarn made of bound spun yarn that is made flexible by reducing the number of wrapped fibers and imparting a low top twist. Conventionally, there have been many reports on bound spun yarns in numerous documents. One of the representative examples is Japanese Patent Publication No. 43-28250, which describes a core bundle with virtually no twist and a core fiber with an irregular helical shape at various angles ranging from 10° to 80°. A spun yarn consisting of surface fibers tightly twisted around the surface is described. Further, Japanese Patent Publication No. 55-488 discloses a spun yarn in which fibers are wound spirally around a substantially twist-free core fiber bundle at a nearly constant angle and bound together. However, the major premise for production of these hitherto reported bound spun yarns was that they had sufficient single yarn strength to be usable as single yarns. for that,
The wrapped fibers are tied together by tightening the core fiber bundle.
Efforts have also been made to wrap the wire as evenly and evenly as possible. In other words, if there are a certain number of continuous areas where there are no wrapped fibers or where the wrapped fibers are loosely tightened,
The strength of that part decreases and even the slightest tension causes it to come off, making it not only impossible to use single yarn, but also the conventional post-processing process (winding yarn, doubling yarn, wrapping yarn).
This was because it was difficult for the winding thread to pass through. Therefore, conventional bound spun yarns have an average number of wrapped fibers, and the core fiber bundles need to be tightened to some extent, so they inevitably have a slightly rough and hard feel. For this reason, there is almost no difference in texture when compared to ring yarn with a fine count of around 60s, but when it comes to thick yarns of around 30s or less, the difference becomes considerable, and there are no restrictions on usage. I didn't get it. Furthermore, it has been difficult to expand into fields that take advantage of the flexibility and fullness of soft yarns using long-spun staples or high bulk yarns. It is an object of the present invention to provide a twist yarn made of tied spun yarn that can be used in fields where flexibility is utilized, such as sweet twist or high bulk, by eliminating the drawbacks of the conventional tied spun yarn described above. A twisted yarn made of a bundled spun yarn according to the present invention that achieves this object is composed of a core fiber bundle with substantially no twist, and wrapped fibers wound around the core fiber bundle. In a twisted yarn in which multiple bundled spun yarns occupy 50% or less in the length direction of the wound part, the upper twist direction is opposite to the helical direction of the wound fibers. It is characterized by a top utilization rate of 200% or more as shown in the following formula. Upper twist utilization rate = Strength of twist yarn/Strength of pulled yarn after upper twist disassembly of the twist yarn x 100...Formula In addition, the method for manufacturing twist yarn made of bound spun yarn according to the present invention is a fiber bundle made of staple fibers. After drafting, nip and supply to the temporary twisting area,
The fiber bundle is twisted by a temporary twisting means, and a fiber bundle that has been substantially twisted by the twisting means and a small number of fiber bundles that have been twisted have free fiber ends that are not substantially twisted. are transported and unraveled in an integrated state to spin a bundled spun yarn consisting of a core fiber bundle with virtually no twist and wrapped fibers wound around the core fiber bundle, and then a plurality of the yarns are When manufacturing a weft yarn that is made by doubling a book and making it into a twisted yarn, the overfeed rate in the temporary weave area defined by the following formula is set to 3.
% or less, the degree of unity of the wrapped fibers is weakly spun, and the multiple threads pulled out from multiple temporary twist areas are combined and wound, and then the spiral direction of the wrapped fibers is opposite to the spiral direction of the wrapped fibers. It is characterized in that it is directly threaded in the top weave direction to obtain a weft thread with a top weft utilization rate of 200% or more as shown by the following formula. Utilization rate of upper weave = Strength of weft thread/Strength of pulling thread after disassembly of upper twist of weft thread x 100... Formula However, overfeed rate = V _F − V _D / V _D × 100 (%)... Formula V _F : Speed of supply to the temporary twisting area V _D : Speed of withdrawal from the temporary twisting area The present invention will be described below with reference to embodiments of the invention shown in the accompanying drawings. FIG. 1 is an embodiment of the present invention, showing a double yarn made of bound spun yarn. Virtually twist-free core fiber bundle 1
The wrapped fiber 2 is wound around the . In this invention, the number of wrapped fibers is small, and the binding is weak.
In other words, it is necessary to have a loosely wound part or a small number of tightly wound parts. In other words, due to loose winding or a small number of tightly wound parts, the strength of the single yarn is weakened, but the yarn has a soft texture and high bulk. Therefore, the bundled spun yarn used in the present invention is a bundled spun yarn in which the ratio of the wrapped fibers in the length direction of the portion where the core fiber bundle is wound is 50% or less, and the ratio is If the amount exceeds 50%, the flexibility and fullness of the yarn, which are the intended objectives of this invention, cannot be obtained. An example of this state of weak binding is shown in FIG. Here, the wrapped fibers are only partially present;
The tightly wound portion 3 is small, and the loosely wound portion 4 and the non-wrapped portion 5 account for more than half of the portion. Although the core fiber bundle is substantially twist-free, it often has alternating twists, and some portions 6 have twists. The bundled spun yarn used in this invention has a small number of wrapped fibers and is poorly bound, so the yarn itself has flexibility and bulge, but in terms of strength, the single yarn strength is low, and the single yarn has low strength. As it is, it cannot be used for ordinary knitted fabrics. Therefore, double thread,
It can only be used by combining multiple threads, such as triple threads, and adding a top twist to create a twisted thread. In other words, even if the single yarn tenacity is extremely low, by combining it and adding a top twist, the tenacity can be improved to the same degree as double yarn made of tied spun yarn with strong winding, and it can be used in knitted fabrics, etc. without any problem. Along with the flexibility of the single yarn,
It can have both bulk and high properties. The twist yarn of the present invention is made to have flexibility and fullness by winding the yarn so weakly that the single yarn tenacity is extremely low. The degree of this is the upper utilization rate value (hereinafter referred to as the RF value)
The RF value must be 200% or more. If the RF value is less than 200%, the cohesion will be strong and flexibility and bulge will be difficult to recognize. That is, an RF value of 200% or more is necessary to obtain flexibility and bulkiness, and it is most preferable to set the RF value to 250% or more. Note that the RF value is defined by the following formula. RF = Strength of twisted thread / Strength of pulled thread after unraveling the upper thread x 100
(%) In the twist yarn of this invention, the core fiber bundle is substantially twist-free at the above-mentioned weak binding level, so the lower the top twist number, the higher the flexibility and bulkiness, but if it is too low, the strength is insufficient. This will cause poor appearance due to thread cracking.
The value is the twist coefficient K, which is preferably within the range of K=30 to 60. Here, the upward twist coefficient K=T/√
N, T: number of top twists (times/m), N: metric count of twist thread. In addition, in the case of high bulk yarn using cotton with different shrinkage rates, a range of K=35 to 45 is most preferable in terms of strength and bulk. Furthermore, it is consistent with the purpose of the present invention that the twist direction of the top twist is opposite to the helical direction of the wrapped fibers, that is, the direction in which the binding of the wrapped fibers is weakened by the top twist. Adoption is essential for obtaining the desired effect of the present invention. If the top direction is the opposite, the threads will be tightened by the wrapped fibers, and it will be extremely difficult to obtain the soft texture and bulk height that are the aim of the present invention. As shown in FIG. 2, the bound spun yarn of the present invention has few tightly wound portions of the wound fibers, and
Loosely wrapped parts and unwrapped parts account for more than half. Expressing this as a ratio of the wound fibers to the length of the part where the core fiber bundle is wound, it is usually 50% when the low single yarn strength of this invention is achieved.
% or less, and is often less than 40-30%. In addition, according to the knowledge of the present inventors, the utilization rate of the top weave of the twist yarn using the conventional bundled spun yarn is usually around 100 to 120% at most, which is lower than that of the ring spun yarn. The same is true even when using twisted thread. This remarkable difference in the upper weave utilization ratio values between the weft yarn of the present invention and the conventional weave yarn clearly reveals the uniqueness of the present invention. FIG. 3 shows the method for manufacturing the twisted yarn of this invention. The device used in this invention is a combination of a normal roller draft device and a temporary twisting device. In FIG. 3, a fiber bundle 7 made of staple fibers is drafted by rollers 8 and 9, nipped by rollers 9 and 9', and supplied to a temporary twisting device 10. Here, a spindle type or the like can be used as the temporary twisting device, but the ease of threading
Air temporary twisting is suitable because of its high twisting ability. Although most of the nip-fed fiber bundle is twisted in the pre-twisting device, a small number of substantially untwisted free fiber ends are produced at the ends of the fiber bundle.
The fiber bundle that has been substantially added by this addition and a small number of the fiber bundles that have been added have free fiber ends that are not substantially added to the transport means 1.
1, and then disassemble them in an integrated state. At this time, the fibers having free fiber ends are wound around the core fiber bundle, and a bound spun yarn consisting of a core fiber bundle with substantially no twist and wrapped fibers wound around the core fiber bundle is obtained. Conditions are set so that the number of wound fibers is small and the winding is loose. Thereafter, the yarn 13 passed through the delivery roller 12 and taken out from the temporary twist area is doubled and then wound around one piece of cheese as a uniform yarn. The thread that has been doubled and wound around one piece of cheese is then directly twisted by a winding thread machine to form a twisted thread. In order to reduce the number of wrapped fibers, the overfeed rate in the temporary twist area (hereinafter referred to as OF rate) is
It is most effective to make it small, and it is necessary to set it to 3% or less, preferably 1% to
A range of -2% is preferable. The OF rate is a value expressed as OF rate = V _F - V _D /V _D × 100 (%), where V _F is the supply speed to the temporary twist area and V _D is the withdrawal speed from the temporary twist area. It is also effective to provide a fiber bundle width regulating collector 14 between the front roller and the second roller to narrow the width of the fiber bundle supplied to the front roller. Moreover, it is most preferable that the width is 70√1 (meter count of single yarn) mm or less. Furthermore, the degree of winding can be reduced by weakening the force applied by the temporary twisting device. Like this OF
The above-mentioned RF value can be increased to 200% or more by setting conditions such as ratio, collector width, and degree of addition. The larger this value is, the softer and bulkier the yarn becomes, so it is preferable to set various conditions. As a means for transporting the fiber bundle that has been added and a small number of free fiber ends that are not added, there are the air duct method shown in FIG. 3, the apron method shown in FIG. 4, and the aspirating jet method (not shown). used. According to the method of the present invention, the yarn strength in the temporary twisting region tends to be low, and the tension applied to the yarn tends to be high. Therefore, as shown in FIG. 4, if the distance between the twist prevention guide 15 and the delivery roller 16 is large, there is no temporary twist between them and there is a possibility of yarn breakage, so the distance should be less than the average fiber length. It is preferable. Also, when using staples with short fiber length,
The thread will break easily even in the temporary twist area. In that case, if multiple threads are combined and taken off in the temporary twist unraveling area before the delivery roller, the rotation of the yarn by the untwist will cause the threads to twist together after passing through the temporary twisting means and cause alternate twists, thereby preventing thread breakage. It will be resolved. However, in this case, variations in the number of top twists remain even after the yarn is finished, due to the alternating twists, which affects the appearance of the final product. In this invention, the yarn can be used in any type of yarn machine, such as a regular ring yarn machine or a double twister, but since the pulling strength of the yarn is low, creels, guides, etc. are used to reduce the tension applied to the yarn. Adjust. The fibers used in this invention may be of any type, such as synthetic fibers such as polyester, nylon, and acrylic, chemical fibers such as rayon, natural fibers such as cotton, hemp, and wool, or blends thereof. Further, the core fiber bundle does not need to be 100% staple fiber, and may contain continuous fibers such as processed yarn and filament. According to the method of the present invention explained above, it is possible to speed up the spinning by using the temporary twisting means, and it is also possible to speed up the spinning by using the temporary twisting means. The process can be omitted and can greatly contribute to labor saving and cost reduction. Next, an example of the present invention will be explained with reference to Examples. In the following examples, the helical direction of the wrapped fibers of the bound spun yarn is all Z unless otherwise specified.
It is of direction. Example 1 Acrylic tow (single yarn denier 3D) was cut using a Turbo stapler (manufactured by Turbo, USA),
It was made into a high shrinkage sliver with a shrinkage rate of 27%. Next, a part of this high shrinkage sliver was heat treated at 105° C. for 15 minutes using a steam setter to obtain a low shrinkage sliver. This high shrinkage sliver is 40%, low shrinkage sliver is
It was mixed with a gill at a ratio of 60% and made into roving with a boviner. Using this roving, a 1/32Nm yarn is spun using a device equipped with an apron with an open tip and an air twist nozzle as shown in Fig. 4, and after doubling the two yarns pulled out by a delivery roller. , and wound it around a piece of cheese as a uniform thread. The spinning conditions were a delivery roller speed of 150 m/min, a front roller speed of 151 m/min, an OF rate of 0.67%, a collector width of 12 mm for regulating the width of the fiber bundle to the front roller, and a compressed air pressure of 3.0 Kg/cm ² to the temporary twist nozzle. Next, the wound yarn was directly twisted in the s-direction 160 times/m (twist coefficient K: 40) using a ringen yarn machine to form a twisted yarn.
This twisted yarn had a soft texture that could not be obtained with conventional tied spun yarn. In addition, this twisted yarn was treated with moist heat using a skein (100℃ x
15 minutes), a bulky yarn was obtained. Table 1 shows the measured values for strength and bulk compared to ring spun yarn made from the same raw material as this yarn, and the yarn of the present invention exhibits bulk almost equivalent to the ring yarn.

[Table] Measurements were made using a Tensilon machine, and the strength of the pulling yarns after upper twisting was measured with the two yarns pulled together. When the obtained bulky yarn was knitted into a fabric, a fabric with excellent quality was obtained without the twisting of the stitches that was often seen in conventional ring yarns. When used as a knitted boa, it had very good defibrating properties and a good appearance and feel. Example 2 A 2D acrylic tow was cut into a low shrinkage sliver in the same manner as in Example 1, and two levels of yarn were spun using the same equipment. At level -1, the OF rate is
0.5%, the fiber width regulation collector was set to 6 mm width, and in level-2, the OF rate was set to 4% and the collector width was set to 12 mm.
Thereafter, a twist of 204 times/m was added to the wound and aligned yarn to obtain a twisted yarn. Table 2 shows a comparison of the strength and texture of these two types of twist yarns.

[Table] Example 3 Acrylic 2D tow was cut in the same manner as in Example 1, and a high shrinkage sliver of 40% and a low shrinkage sliver of 60% were cut.
% roving was made. This roving was spun using the same device as in Example 1 and wound as a drawn and aligned yarn, and then a top twist in the s direction was added. Table 3 shows the relationship between the number of twists, strength, and umbrella height, and it is clear that the lower the twist coefficient, the higher the umbrella.

【table】 [Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a twisted yarn made of bound spun yarn of the present invention, FIG. 2 is a schematic diagram of a bound spun yarn with weak winding used in this invention, and FIG. 3 is one implementation of the method of this invention. FIG. 4 is a schematic diagram illustrating another embodiment of the method of the invention. 1: core fiber bundle, 2: wrapped fiber, 3: tightly wrapped portion of wrapped fiber, 4: loosely wrapped portion of wrapped fiber, 5: portion without wrapped fiber, 6: partially Twisted part, 7: Fiber bundle made of staple fibers, 8, 9, 9': Rollers, 10: Temporary twisting device, 11: Transfer means, 12: Delivery roller, 13: Yarn, 14: Width regulation collector, 1
5: Twisting prevention guide, 16: Delivery roller.

Claims (1)

[Scope of Claims] 1. Consisting of a core fiber bundle with substantially no twist and wrapped fibers wound around the core fiber bundle, the length direction of the portion where the wrapped fibers wrap around the core fiber bundle. A plurality of bundled spun yarns having a proportion of 50% or less in the yarn are twisted together, and the twist direction of the upper twist is opposite to the helical direction of the wrapped fibers, and is shown in the following formula. A twist yarn made of bound spun yarn characterized by a top twist utilization rate of 200% or more. Utilization rate of top twist = strength of weft thread/strength of pulling thread after top twist of weft thread is disassembled × 100 (%) ...Formula 2 The twist coefficient K of top twist is 30 to 60. The twisted thread according to claim 1. However, the twist coefficient K of the upper twist = T/√, T: Number of upper twists (times/m), N: Metric count of the twist thread 3 A patent characterized in that the twist coefficient K of the upper twist is 35 to 45. The twisted thread according to claim 1. 4 After drafting a fiber bundle consisting of staple fibers, the fiber bundle is nipped and supplied to a temporary twisting area, and the fiber bundle is twisted by a temporary twisting means, and the fiber bundle that has been substantially twisted and a small number of Fibers having free fiber ends that are not substantially added are transferred to the added fiber bundle, and the fibers are unwound in an integrated state to form a core fiber bundle with substantially no twist, and a core fiber bundle thereof. When producing a twisted yarn that consists of a bundled spun yarn consisting of wrapped fibers that are wound around the periphery, and then a plurality of yarns that are combined into a twisted yarn, the overfeed rate in the temporary twisted area defined by the following formula is is set to 3% or less, the degree of binding of the wrapped fibers is weakly spun, a plurality of threads pulled out from a plurality of tentative twist areas are combined and wound, and then the helical direction of the wrapped fibers is A method for producing a weft yarn made of bundled spun yarn, which is characterized in that it is directly threaded in the reverse top weave direction to obtain a weave yarn with a top weave utilization rate of 200% or more as shown by the following formula. Top weave utilization rate = Strength of weft thread/Strength of pulling thread after disassembly of weft thread x 100 (%) ...Formula However, overfeed rate = V _F - V _D / V _D x 100 (%) ...Formula V _F : Supply speed to the temporary twist area V _D : Pulling speed from the temporary twist area 5 Claim 4, characterized in that a staple fiber supply width regulating collector is provided before the front draft roller. The method for producing the described twist yarn. 6. The twist according to claim 4, characterized in that a twist prevention guide is provided in the unwinding zone of the temporary twist area, and the distance between the guide and the temporary twist area pulling roller is equal to or less than the average fiber length of the staple fibers. How to make yarn.