JPS6011132B2 - Special tied spun yarn and its manufacturing method - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a novel bound spun yarn and a method for manufacturing the same, and more specifically, in the constituent fibers, sufficient bound fibers (in the present invention, the core fibers of the bound spun yarn structure are wrapped around and bound). The present invention relates to a special high-strength spun yarn with high strength and a method for manufacturing the same. Compared to the conventional spinning method that imparts real twist, the spinning method uses fluid to wind the fibers by false twisting, or uses fluid turbulence to intertwine the fibers, and then adheres them with a binder to form yarn. The method of making yarn without applying real twist is high productivity due to high speed, greatly shortens the process and ease of equipment operation, does not require rewinding, and can be shipped immediately after using a large package, or can be shipped in a large amount. Since it has many advantages such as an energy saving system, its development is being actively promoted in various fields. However, in terms of product processing performance and practical performance, the closest thing to conventional real twisted yarn is a core fiber that is essentially untwisted, mainly consisting of staple fibers, and a staple fiber that winds the surface layer of this fiber. It is a bound spun yarn composed of fibers, and in the United States it was already introduced as “ROTO” seven years ago.
FIL" was commercially produced under the trademark "FIL". In this method of manufacturing bound spun yarn, the present inventors developed a transfer apron band as a means of transporting the peripheral fibers of the fibers at the draft out to become bound fibers. We have developed a method using a fiber transfer tube using airflow (Tokukan Sho 51-64037 Publication, Iso Sho 53-42095, Sho 53-42096), which has improved the appearance and performance of real twisted yarn. We have already proposed a production system for bound spun yarn that is close to that of yarn.Generally, in actual twisted yarn, if the strength of ring spun yarn is 100, it is said that the strength of open-end yarn is 75 to 85 due to the difference in fiber extent. stomach
O SMmposlmmlntemationaI
Research Tephanuile Cotonj e
re (inParis) (1969-4)” p249~
265, and “Text.lnd.” (1972-11)
,etc). On the other hand, in the case of bound spun yarn, the core fiber east of the non-twisted part is in a slightly zigzag state due to the twisting and shrinkage of the bound fiber itself. It was 90 to 95, and did not reach the same level as ring yarn. Furthermore, although it is rare, there are areas where binding fibers are not formed, or even if they are formed, they are disordered and the binding strength is insufficient, which may cause slippage. In the draft zone, the surrounding fibers on the east side of the fibers, which should become binding fibers, may be blown away by some external factor such as turbulence, or the air jet from the air vortex nozzle for false twisting may occur. This occurs when the twisting force is reduced due to clogging of the holes, or when the transporting effect on the surrounding fibers that should become binding fibers is insufficient. Shedding due to insufficient binding can cause problems in later processing steps, and can be fatal to the tied spun yarn.How to prevent this from happening is to combine it with making the strength comparable to that of ring yarn. This is a major issue that needs to be solved.
As another known example, it is known from JP-A-51-7244 that a bound spun yarn is obtained by using straight paper, but this method imparts real twist to the core fiber, so high-speed spinning is not possible. However, even if pseudo-combustion is applied instead of actual twisting, there is no way to use fibers with a long fiber length as the core and fibers with a short fiber length as the surface-wrapped fibers, so problems such as shedding may occur. is not improved. Furthermore, improvement of the stability diagram (fiber length distribution) by cutting is disclosed in Japanese Patent Publication No. 52-114731, Japanese Patent Application Laid-open No. 49-110931, and Japanese Patent Publication No. 51-28.
Publication No. 735, Publication No. 47-21263, Publication No. 6975-1975, Publication No. 14127-197, Publication of Hakama Publication No. 50-35126, Publication No. 48-410 of Sho.
These techniques are known from Japanese Patent Application No. 84, etc., but all of these techniques attempt to increase the number of staple fibers with a length close to the average fiber length, which results in the above-mentioned "skipping".
It was not possible to improve the shortcomings. The inventors of the present invention have conducted extensive research in order to obtain a bound spun yarn that does not compensate for the shortcomings of these bound spun yarns and has performance comparable to or better than that of real twisted yarn in all aspects. They succeeded in developing a special tied spun yarn.
In other words, as a result of examining the formation process of bound spun yarns so far, we found that '1] Bundled fibers tend to have floating fibers in the draft zone (particularly those that are less than 1/2 of the effective average fiber length 1). many). '2} The longer the fiber length, the higher the strength of the yarn, which will not fall through even with a small number of bound fibers. The two basic principles of bound spun yarn have been clarified. However, in the general spinning principle, this phenomenon is contrary to the purpose of 01 and '2} material, and if you try to increase the number of floating fibers, the quality of the yarn will deteriorate drastically due to draft unevenness, and if you try to lengthen the fibers, the suspended fibers will deteriorate. In other words, the number of bound fibers decreases, causing an asymmetric draft due to the long fibers. The present invention deals with this contradictory '1',

The object of the present invention is to provide a special bound spun yarn that satisfies the principle (2) at the same time and a method for producing the same. That is, the present invention consists of the following configuration. {11 In a bound spun yarn in which the core is substantially untwisted and bound fibers are wound around the surface, the core is mainly composed of long staple fibers, the bound fibers are mainly shortened staple fibers, and , the average fiber length (1
15% or more of staple fibers with a length of 1.5 times or more of ) are present, and 0.5% of the average fiber length ( ) is present. A special binding spun yarn characterized by the presence of 15% or more of staple fibers with a length equal to or less than the needle sound. ■ After cutting the tow, the fiber east is passed through one stage of modified twisting zone and then continuously passed through a false twisting nozzle to form a bundled spun yarn. 2.9 tones or higher, and the modified Ken-kiri gauge is 0.4 to 0.0 of the gauge in the Ken-kiri zone. A method for producing a special tied spun yarn characterized by making needle sounds. ■ After cutting the tow, the fibers are passed through one stage of modified cutting zone and then continuously passed through a false twisting nozzle to form a bound spun yarn. The semi-stretched tow is supplied and stretched, and the stretched toe in a uniform sheet state is continuously supplied to the cutting zone in a tensioned state, and then in the modified cutting zone, the cutting magnification is adjusted. 2.5 times or more, and the modified Ken-kiri gauge is 0.4 to 0. A method for producing a special tied spun yarn characterized by making needle sounds. In the spun yarn of the present invention, the core is mainly composed of long staples, the binding fibers are mainly composed of short and long staples, and among the constituent fibers with an average fiber length of 1, 0.5
Since the structure is such that short fibers of 1.51 or less and long fibers of 1.51 or more are present at least 15% each, the ring yarn can be effectively formed by forming binding fibers and maintaining sufficient strength. An excellent bound spun yarn with no inferiority in performance can be obtained. Next, in the method of the present invention, in the modified Ken-kiri zone, the Ken-kiri magnification (hereinafter referred to as the "Modified Ken-kiri magnification")
2. above the sealing sound, and the corrected Ken-kiri gauge is 0.4 to 0.0 of the Ken-kiri zone gauge. By rubbing scale sound 1,
It can be produced by creating peripheral fibers of short floating fibers that are effective for bundling, and simultaneously forming three long fibers that are sufficient to provide strength and using these as the core part of the yarn body. If the corrected cutting magnification is less than 2.5 times, it is difficult to form effective peripheral fibers, and it is extremely difficult to form binding fibers. In this case, as a yarn forming means, in order to effectively bind peripheral fibers, a binding spinning system having a means for transporting peripheral fibers using a compare apron band (a system described in Samurai Ko Sho 52-43256) is used. or a similar system is preferable, but of course the system is not limited to such a system and an aspirator or the like can also be used as a moving means. Furthermore, when tow is supplied to the cutting zone, a stretching mechanism is provided in front of the cutting zone, and the undrawn yarn, which is substantially untwisted, or the partially drawn semi-drawn yarn, is straightened and then stretched. This sheet-like stretched toe with little unevenness in thickness does not loosen or significantly change the toe width after stretching, and is then fed to a continuous cutting zone in a taut state after stretching. By performing the cutting under the above conditions, the occurrence of miscuts due to intersection of the fibers in the cutting zone or modified cutting zone is suppressed, short fibers and long fibers are formed in a normal state, and abnormalities are prevented. The disorder of the bound fibers due to the fiber length distribution is eliminated, and not only a uniform bound spun yarn with no omissions is formed, but also a bound spun yarn with very few yarn defects such as slubs. Next, the present invention will be explained with reference to the drawings. Figures 1 and 3 are process schematic diagrams showing an example of the manufacturing method of the present invention, and Figure 2 shows the fiber length distribution (staple diagram) of the constituent fibers of the yarn obtained. be. In FIG. 1, a tow 3 pulled out from a tow storage can 2 is pulled out by a guide 4, passes through a guide 5 and a tow bar 6, and is leveled to a uniform thickness, and is then moved to a tow cutting zone B by feed rollers 9 and 91. The Kengo rollers 10 and 1 rotate faster than the feed rollers 9 and 91.
01, it becomes a staple, and is fed to the corrected cutting zone C. The corrected cut-off gauge L' of the corrected cut-off zone C needs to be 0.4 to 0.9 times the cut-off gauge L of the cut-off zone B before the corrected cut-off zone, and is preferably 0. .5 to 0. The sound is good. Also, the corrected Ken-kiri magnification must be 2.3 tones or more.
Even when the correction cutting is performed in two or more stages, in the correction cutting zone immediately before the yarn forming zone, the correction cutting gauge is 0.4 to 0.9 times the previous correction cutting gauge, preferably 0. .5 to 0.6 times is good, and if the corrected cutting magnification is not 2.3 tones or more, the peripheral fibers that should become binding fibers will not be formed, and a sufficient binding will not be formed, resulting in a decrease in yarn strength and damage to the surface. Because the structure is loose, straining neps are more likely to occur. Compare apron bands 12, 121 are wrapped around the correction cutting rollers 11, 111, and together with the open end rollers 13, 131 and the avortex nozzle 14, they form a yarn forming zone ○. Compare apron band consists of long fibers that are moderately modified and cut to maintain yarn strength, and peripheral fibers that are floating fibers and can form an effective bundle as peripheral fibers. The central fiber group (core fiber east), which is mainly made up of long fibers, is subjected to the false twisting action by the eavortex in the warp and in the untwisting zone.
are tightly and effectively bound to form a bound spun yarn consisting of an untwisted core portion containing long fibers and bound fibers mainly consisting of short fibers. 15 is a take-up delivery roller, 16 is a binding spun yarn, 1
7 is a winding package. FIG. 2 shows the fiber length distribution of the constituent fibers of the bound spun yarn thus obtained. The maximum total length is approximately close to L' of the modified Ken-kiri gauge. 1 for average fiber length 1
．． A diagram in which 15% of the fibers have a fiber length of 51 or more and 15% have a fiber length of 0.51 or less is indicated by a solid line ■. The special bound spun yarn of the present invention has a point S with an average fiber length of 1 as its border. Not only is it effectively formed, but even if the binding strength of the binding fibers is insufficient in some areas, the long fibers in the core maintain sufficient strength.
The overall strength is comparable to that of ring thread. The average fiber length 1 is preferably 50 to 500 ribs, most preferably 100 to 25 ribs. It is possible to obtain a desired value for the average fiber length i by adjusting the conditions of the cutting zone and the modified cutting zone. FIG. 3 is a process schematic diagram showing an embodiment of the method of the present invention for supplying undrawn yarn or semi-drawn yarn. A tow 31 consisting of an untwisted undrawn yarn or a partially drawn undrawn yarn or a semi-drawn yarn pulled out from a partially drawn semi-drawn yarn drum 1 is connected to a guide 4.
, 5 to a towing bar 6, where the tow is straightened, and then fed to a stretching zone A by feed rollers 7, 71. The drawing zone A is provided with a heating pin 8 that is heated to a temperature higher than the glass transition temperature and a drawing roller 9' that rotates at a higher speed than the feed roller. The toe has a curvature of 5 skins or more in diameter, and uniform stretching is performed with the stretching point fixed in a substantially straight line (a straight line perpendicular to the direction of toe movement).Stretched toe is a stretched, uniform sheet with little thickness unevenness and each fiber is completely parallel without intersecting, but if it is loosened and disturbed in the middle, or the sheet width is changed significantly. The staple is supplied under uniform tension to the continuous cutting zone B, where it is cut by the cutting rollers 10 and 101 to become a staple. Correction cutting rollers 11, 11 of correction cutting zone C connected to the zone
1, the correction is terminated. At this time, the modified Ken-kiri gauge L' is 0.4 to 0.0% of the previous Ken-kiri gauge L. The sound of the needle, and the modified Kenkiri multiplier in the modified Kenkiri zone is 2.
．． By increasing the number of fibers by 5 times or more, long fibers that are effective for maintaining yarn strength and short floating fibers that become binding fibers are generated very effectively, and peripheral fibers are generated by modified Ken-kiri aura11,111.
The fibers are transported without being disturbed or blown away by the compare apron bands 12, i21 for transporting the peripheral fibers, and are temporarily combusted together with the central fiber bundle by the air vortex nozzle 14 in the yarn forming zone D.
A bundled spun yarn is formed and pulled out by a delivery roller 15 to become a bundled spun yarn 16 and wound into a package 17. In this case, in the cutting and modified cutting zones, the supplied fibers are sheet-like and have little unevenness in thickness, and there is virtually no crossing of fibers, and the tension is constant, so the fibers are not cut. There are almost no miscuts due to abnormalities in the distribution of cutting points in
Not only is uneven binding eliminated and looseness eliminated, but the resulting spun yarn is uniform and excellent, with almost no yarn defects such as thick or thin yarns caused by abnormal clustering of overlong fibers. The fiber length distribution diagram in this case is also as shown in FIG. In other words, when the average fiber length is 1, 1.51 or more is 15%.
For the curve ■ (indicated by a solid line) containing 15% of 0.51 or less, the broken line ■ is located above the solid line in the region where the fiber length is long and below the solid line in the region where the fiber length is short, with the center S point as the border. Become.
Therefore, 15% or more of fibers with a diameter of 0.51 or less, which can effectively serve as binding fibers, are included, and 15% or more of fibers with a diameter of 1.51 or more, which are effective in maintaining yarn strength, are sufficient for binding.
Moreover, a highly strong bound spun yarn with no looseness can be obtained. In the special bound spun yarn of the present invention, as mentioned above, the fibers of 1.51 or more and the fibers of 0.51 or less are each 1
It is necessary that the fibers have a content of 5% or more, but particularly preferably, the content of fibers with a content of 1.51 or more is about 1.5% to 25%, and the content of fibers with a content of 0.51 or less is about 15% to 20%. It is better to set the composition ratio in terms of yarn strength. In the present invention, the type of fiber supplied may be any thermoplastic synthetic fiber, and is not particularly limited, but includes polyester fiber,
The effect appears to be most pronounced in the case of nylon fibers. Of course, it is also effective to use a mixture of multiple types of fibers as appropriate. Hereinafter, specific configurations and effects of the present invention will be explained using Examples. Example 1 In the method of the present invention using one-stage modified cutting, the process of which is shown in FIG. The thread quality and thread forming conditions are shown in Table 1. Note: The thread cutting test was performed using a winder at a speed of 500 m/min under a tension of 100 g. This is the number of skips per 10029 when rewinding at the same speed. The ratio L/L of the gauge L is set to 0.5 and 0.7 within the range of 0.4 to 0.9 according to the present invention (1, D in Table 1), and the modified Ken-chiri magnification is 4. In this case, 1=110-123 side,
1.51 or more 15%~20%, 0.51 or less 18%~
Although the bundled spun yarn according to the present invention has a fiber length composition of 16%, and is spun at an ultra-high speed of 100 min, it is superior to conventional spun ring yarns in terms of average strength, minimum strength, strength fluctuation rate, and clearness. It was about average or better. In addition, the special public corporation Showa 5
Compared to the bundled spun yarn obtained by the conventional sliver method disclosed in Japanese Patent Publication No. 2-43256, the yarn strength is not only greater, but the strength itself has less variation, and is of far superior quality. In particular, the throughput is reduced to 1'3 to 1'4. On the other hand, in (m) and (W) outside the present invention, L/L
As the value becomes smaller, the number of cut fibers in the corrected cut zone increases, making it easier to cause uneven cut due to miscuts, increasing the strength fluctuation rate, making it difficult to form floating fibers, and further reducing the number of fibers with a diameter of 0.51 or less. The content rate also decreases significantly, resulting in frequent omissions. When the /L exceeds 0.92 and 0.9, the corrected cutting gauge of the fiber length is not suitable, and only floating fibers increase, the yarn unevenness due to the uneven draft of corrected cutting increases, the fluctuation rate increases, and the average strength value decreases. do. On the other hand, although it is not shown in Table 1, if the corrected Ken-kiri magnification is divided by 2.3 tones, the value is /L.
Regardless of the condition, there were many loose ends due to poor binding. Example 2 In the method of the present invention, the process outline of which is shown in FIG. Correct cutting was performed in a straight cutting zone with a modified cutting gauge, and the yarn was formed at an overfeed rate of 5.6% to obtain a bound spun yarn. The modified Ken-kiri magnification in the modified Ken-kiri zone was set to 4.2 times. At this time, the fiber length distribution in the corrected cutting out is as follows: average fiber length 1 = 1 female rib, fiber length of 1.51 or more 18.2
%, 16.7% were 0.51 or less. On the other hand, single yarn denier 3. 10. By conventional ring spinning using nylon staples on the fiber length 102 side. Obtained nylon spun yarn for the eaves. Table 2 compares the yarn properties of the bound spun yarn according to the present invention and the conventional ring spun yarn. 2 As can be seen from Table 2, the strength of conventional ring threads is 3.
．． 76 t/d and tenacity fluctuation rate of 7.9%, whereas the tied spun yarn of the present invention has a strength of 3.86 t/d and tenacity fluctuation rate of 8.0%, which are almost at the same level as the subordinate ring yarn. On the other hand, under a tension of 100 mm, the occurrence of shedding in 1' winding occurs 3 times per 100k9 of rewind yarn in the conventional yarn, but only 2 times in the yarn of the present invention, and there is no problem due to shedding. It was 2/3 of the conventional yarn. In addition, in conventional tied spun yarn using staples, the overfeed rate must be set to 8 to prevent the occurrence of shedding to a level that can withstand practical use.
．． In this case, there were many problems for practical use due to deterioration in the appearance of the yarn due to twist shrinkage and a decrease in average tenacity of 10 to 20%. Also, when L'/L is set to 0.95, or 0.3
When set to 5, the resulting bound spun yarn has Worcestershire unevenness u%
was more than 20%, and the thread unevenness was large, making it unsuitable for practical use. Furthermore, if the modified Ken-cut magnification is made smaller than 2.8, 20% of the fibers have a fiber length of 1.51 or more.
However, the fibers with a diameter of 0.51 or less were about 10%, and the number of floating fibers was small, and the resulting yarn had a loose texture. Example 3 In the method of the present invention, the process outline of which is shown in FIG. 3, the raw material was given a natural stretching ratio of 3. The old undrawn polyester yarn of 6,700 denier was supplied with a heat pin (Gaiyo 6) heated to 90℃.
The tow is stretched at a stretching ratio of 2.8 times in the stretching zone A with a 2.8x stretching ratio, and the tow is stretched in the stretched tow without significantly narrowing the width and in the tensioned state after stretching. Supplied to cutting zone B, cutting magnification 2. Stapling is performed with a sealing sound, and then, in the corrected cutting zone C where the gauge is 0.5 stitch sound of the cutting gauge, modified cutting is performed with a modified cutting magnification of 3.8, and "continuous cutting" is performed. The bundling of the present invention is performed by applying air false twist to the bound spun yarn using the compare apron band method, overfeed rate 5.0%, paper delivery speed 110 m/min, trowel cotton count 2 sides, undrawn yarn tow start method. A spun yarn (1) was obtained.
00 denier drawn tow was supplied and the bundled spun yarn was spun under the same conditions as in (1) except for the bundled spun yarn (b) of the present invention, and the single yarn denier 1.00 denier. This figure shows the yarn properties of polyester spun yarn using the conventional ring method using W. The undrawn tow-start yarn (1) of the present invention has an average tenacity of 11
After 50 days, the strength fluctuation rate was 8.8%, which was equivalent to or better than the conventional ring yarn and the stretched to-start tied spun yarn (0) of the present invention. Also, 100
1' wind under tension (yarn speed 500'mjn)
The number of shedding occurrences per 100 kg of rewinding was 3.1 times for conventional ring yarn, and 3.1 times for tow-start bound spun yarn (
0), there were 2.0 times, about 2/3 of that, while undrawn tow-start tied spun yarn (1) had 0 times, and there was no occurrence of through-through at all, and the through-through problem was completely resolved. It was particularly good. Furthermore, the conventional ring yarn has a Worcestershire unevenness u% of 9.
9%, drawn tow start tied spun yarn is 9.7%,
The unstretched towstart bound spun yarn was 9.5%, which was superior to these. One coefficient (ratio of theoretical yarn unevenness to measured yarn unevenness) that represents the degree of uniformity of yarn unevenness taking short fiber thickness into consideration is:
Conventional ring yarn 1.64 drawn tow start binding spun yarn 1.
60, the undrawn tow-start tied spun yarn had a yarn unevenness of 1.52, which was superior to the conventional ring yarn and even the stretched tow-start tied spun yarn in terms of yarn unevenness. The constituent fibers in the bound spun yarn of the present invention (1) at this time had a composition ratio of 1.51 or more and 0.51 or less, respectively, of 19.3% and 161%. In this case, set the modified Ken-kiri gauge to 0. Mochi to 0. If it is set outside the needle sound range, there will be many loose spots and at the same time the thread unevenness will be 1.70 or more with a coefficient of 1.If the corrected strength multiplier is less than 2.5 times, the thread strength variation rate will be 15% or more. However, threads that could be used for practical purposes were only those that had been carefully washed.

[Brief explanation of the drawing]

Figures 1 and 3 are process schematic diagrams showing an example of the manufacturing method of the present invention, and Figure 2 shows the fiber length distribution (staple diagram) of the constituent fibers of the yarn obtained. be. 1: Drawn or semi-drawn yarn drum, 2: Tow storage can, 3, 31: Tow, 4, 5: Guide, 6: Adjusting tow bar, 7, 71: Feed roller, 8: Heat pin, 9, 91
: Feed loaf, 9': Stretching roller, 10, 101:
Ken-off roller, 11, 111: Corrected Ken-off roller, 12
, 121: Compare apron band, 13, 131: Sekiguchi tip roller, 14: Air Portex nozzle, 15: Take-up delivery roller, 16: Binding spun yarn, 17: Winding package, A: Stretching zone, B: Ken Cut zone, C
: Corrected cutting zone, D: Thread forming zone, L: Correcting zone immediately before the corrected cutting zone immediately before the thread forming zone or cutting gauge of the corrected cutting zone, L': Correction immediately before the thread forming zone. Ken-kiri gauge in the Ken-kiri zone.
Oh figure Shio 2 figure Soup 3 figure

Claims (1)

[Scope of Claims] 1. A bound spun yarn in which the core is substantially untwisted and binding fibers are wound around the surface, where the core is mainly composed of long staple fibers and the binding fibers are mainly composed of short staple fibers. In addition, the spun yarn as a whole contains 15% or more of staple fibers with a length of 1.5 times or more the average fiber length (l), and a length of 0.5 times or less of the average fiber length (l). A special binding spun yarn characterized by containing 15% or more of staple fibers. 2. After cutting the tow, the fiber bundle is passed through one stage of modified cutting zone and then continuously passed through a false twisting nozzle to form a bundled spun yarn. 2.5 times or more, and a modified cutting gauge is set to 0.4 to 0.9 times the gauge of the cutting zone. 3 After cutting the tow, the fiber bundle is passed through one stage of modified cutting zone and then continuously supplied to the yarn forming zone to form a bound spun yarn. The semi-stretched tow is supplied and stretched, and the stretched tow in a uniform sheet state is continuously supplied to the cutting zone in the stretched state, and then in the modified cutting zone, the cutting magnification is adjusted. 2.5 times or more, and the corrected cutting gauge is 0.4 to 0.9 of the gauge in the cutting zone.
A method for producing a special bound spun yarn characterized by double-folding.