JP4531454B2 - Manufacturing method of special composite yarn - Google Patents

Description

The present invention is yet twisted yarn obtained by twisting yarn of a plurality of, but about the special composite yarn manufacturing how having elasticity.

  Conventionally, a composite yarn having elasticity has been obtained by a method of twisting yarns made of different kinds of materials. For example, the composite yarn shown in Patent Document 1 includes a core yarn and a sheath yarn wound around the core yarn, and a false twisted yarn having stretchability is used as the core yarn. The composite yarn shown in Patent Document 2 is obtained by false twisting a polyester multifilament yarn A and a highly oriented unstretched polyester multifilament yarn B having a birefringence of 0.02 to 0.08. The polyester multifilament yarn A is a yarn made of a composite fiber made of at least two synthetic polymers having different heat shrinkage characteristics. The composite yarn shown in Patent Document 3 includes a core yarn and a sheath yarn, a composite multifilament is used for the core yarn, and the core yarn has a spiral structure. And the composite yarn shown in patent document 4 can be expanded-contracted by making it the entangled twisted yarn comprised from the latent crimp expression polyester fiber multifilament yarn and other multifilament yarn.

These composite yarns are provided with stretchability by maintaining stretchability of the yarn even after cross-twisting, using a portion of the yarn constituting the composite yarn having stretchability. For example, the composite yarns shown in Patent Literature 1 and Patent Literature 3 have a core-sheath structure, and the sheath yarn is twisted so as not to inhibit expansion / contraction of the core yarn while using a core yarn having elasticity. With this, elasticity is achieved. The composite yarn shown in Patent Document 2 is configured to be a false twisted yarn, that is, to prevent expansion and contraction of the yarn by untwisting the twisted yarn after adding it. Moreover, the composite yarn shown in Patent Document 4 maintains the stretchability of the yarn by constituting the yarn by entanglement that entangles the yarn without adding twist.
JP 2001-303378 A JP 2003-27341 A JP 2003-155636 A Japanese Patent Application Laid-Open No. 2004-91991

  However, although many composite yarns having elasticity as described above have been proposed in the past, there is no one having elasticity in a state in which the yarn is twisted, that is, in a state in which the yarn is still twisted. It was. This is because if the twisted yarn is forcibly extended, the twists between the yarns may be shifted or the yarns may be unwound. In addition, as a characteristic of the twisted yarn in which the fibers (filaments) are accurately twisted with a certain number of twists, for example, to obtain a thick yarn having a substantially uniform thickness, the surface of the yarn is not fuzzy and smooth, the cross-section is substantially circular. Can be mentioned. In recent years, with the desired diversification of the texture and the like, a composite yarn having stretchability in addition to the characteristics obtained by such a twisted yarn has been demanded.

The present invention has been made paying attention to such problems existing in the prior art. And has as its object, while characterized as twisting, to provide a preparation how special composite yarn having stretchability.

The invention of the method for producing a special composite yarn according to claim 1 is a method for producing a special composite yarn obtained by twisting a plurality of processed yarns, and having convex and concave portions alternately twisted in the yarn direction. The plurality of processed yarns are produced so that each multifilament yarn is false twisted under the same conditions, and each multifilament yarn is crimped to have the same peak and valley. A twisting step for twisting the plurality of processed yarns, and a heat treatment step for maintaining the twists by heating the processed yarns after the twisting step under overfeed conditions, wherein the twisting step determines the number of twists. performed as 60~80t / m, the heat treatment step is summarized in that, taken in 20 to 100 percent overfeed rate using a touch heater.

An invention of a method for producing a special composite yarn according to claim 2 is the invention according to claim 1 , wherein the processed yarn has a boiling water shrinkage of 8.0% or more and a crimp shrinkage of 35%. That is the summary.

According to the present invention, while characterized as twisting, it is possible to provide a manufacturing how special composite yarn having stretchability.

Hereinafter, an embodiment embodying the present invention will be described.
FIG. 1A is a schematic diagram showing a special composite yarn in a natural state without tension, and FIG. 1B is a schematic diagram showing the special composite yarn in a stretched state. The special composite yarn 10 is a twisted yarn obtained by twisting a plurality of processed yarns. The special composite yarn 10 has convex portions 11 and concave portions 12 on the surface of the yarn alternately in the yarn direction. The convex portion 11 and the concave portion 12 are generated by twisting the special composite yarn 10, and are each spirally connected in the yarn direction.

  The processed yarn is a yarn produced by subjecting a multifilament yarn to false twisting. The multifilament yarn is a yarn obtained by aligning a plurality of synthetic fibers (filaments) in the yarn direction. Further, the false twisting process is a processing method in which a twisting process for adding a twist to a multifilament yarn is performed and then an untwisting process for untwisting is performed. In the multifilament yarn subjected to the false twisting process, natural filament-like crimps (crimps) are imparted to each filament. The crimped filaments extend in a wavy shape, and have a peak at the top of the wave and a valley at the bottom of the wave in plan view. In addition, this filament is extended so that a three-dimensional wave shape may be made, and the crest and trough are each formed in the direction of 360 degrees around the yarn.

  The plurality of processed yarns are used by false twisting under the same conditions, and these processed yarns are evenly twisted to form one special composite yarn 10. The filaments 13 constituting the respective processed yarns are intertwined so that the crests 13a and the troughs 13b are spirally connected to each other. And the convex part 11 of the said special composite yarn 10 is formed when the crests 13a of the filament 13 are connected in a spiral shape, and the said concave part of the special composite yarn 10 is formed by connecting the valleys 13b of the filament 13 in a spiral shape. 12 is formed. In addition, each processed yarn does not have a clear distinction such as a core sheath by being twisted evenly by the false twist processing under the same conditions, and each processed yarn is in a state of being a special composite yarn 10. It is difficult to discriminate one from each other.

  The special composite yarn 10 is a twisted yarn obtained by uniformly twisting a plurality of processed yarns that have been false twisted under the same conditions. Therefore, like the conventional twisted yarn, the thickness is substantially uniform, and the cross section of the yarn has a substantially perfect circle shape. Further, in the special composite yarn 10, the convex portions 11 and the concave portions 12 are formed by connecting the crests 13 a and the troughs 13 b of the filaments 13, so that there are gaps 14 between the filaments 13. is doing. Since the gap 14 is provided, the special composite yarn 10 has a characteristic that it is soft and lighter than a conventional twisted yarn having the same thickness. The special composite yarn 10 is stretchable because the peaks 13a and valleys 13b of the filament 13 are connected to each other and the gap 14 is provided between the filaments 13.

  That is, when a tension or the like is applied to the special composite yarn 10, first, each filament 13 is elongated by making each peak 13a and valley 13b substantially linear. Along with the elongation of each filament 13, the entire yarn of the special composite yarn 10 is stretched as each convex portion 11 and each concave portion 12 stretch while filling the gap 14, respectively. At this time, the filaments 13 are entangled three-dimensionally in the direction of 360 ° around the yarn while connecting the peaks 13a and the valleys 13b. Further, when the tension or the like is lost and the entire yarn contracts, the filaments 13 contract, and the entire yarn contracts by returning to the original crimped state. And since each convex part 11 and each recessed part 12 each extend, the said special composite yarn 10 turns into a thread | yarn which has a big elasticity.

  The conventional twisted yarn is produced by twisting a plurality of processed yarns while applying a certain tension. For this reason, in the conventional twisted yarn, the filaments to which crimps are imparted are entangled regardless of peaks or valleys, and almost no gap is formed between the filaments. Furthermore, the entangled filaments regardless of the peaks or valleys are bound to each other. Therefore, in the conventional twisted yarn, there is no gap between the filaments at each convex part and each concave part, and since the filaments are restrained from each other and are difficult to expand and contract, they cannot be expanded and contracted at each convex part and each concave part, and the stretchability is reduced. It is a thread that does not have at all.

Next, a method for producing a special composite yarn will be described.
The special composite yarn is manufactured using a manufacturing apparatus as shown in FIG. In this manufacturing apparatus, the first feed roller 21 is disposed on the most upstream side (upper side in the drawing), and in order from the upstream side downstream (downward in the drawing) from the first feed roller 21. A touch heater 22 and a second feed roller 23 are provided. The first feed roller 21 and the second feed roller 23 support the processed yarn 10a fed to the manufacturing apparatus so as to satisfy the overfeed condition therebetween. The touch heater 22 maintains the twist of the processed yarn 10a by heating the processed yarn 10a in contact with the inner surface when the processed yarn 10a under the overfeed condition passes through the inside, thereby obtaining the special composite yarn 10. Is. Note that the overfeed condition is that the processing yarn 10a is interposed between the first feed roller 21 and the second feed roller 23 by increasing the rotation speed of the first feed roller 21 compared to the rotation speed of the second feed roller 23. Is the condition that makes the state relaxed. A drum 24 and cheese 25 are provided on the side of the second feed roller 23. The drum 24 and the cheese 25 are collected by drawing the special composite yarn 10 out of the manufacturing apparatus and winding the special composite yarn 10 around the cheese 25.

  In the production of the special composite yarn, the process includes a twisting process in which a plurality of processed yarns are twisted, and a heat treatment process in which the processed yarns after the twisting process are heated under overfeed conditions to hold each twist. Divided.

  The twisting process is performed in advance by using a twisting machine or the like other than the manufacturing apparatus. In this twisting step, a processed yarn is used that is produced by subjecting a multifilament yarn to false twisting. In this false twisting process, it is preferable that the multifilament yarn is strongly twisted at the time of twisting treatment as compared with the conventional conditions for obtaining false twisted yarn. Specifically, it is preferable to twist the multifilament yarn so that the number of twists is 2800 to 3000 t / m as the twisting treatment, and to heat and hold the twist by this twisting at 215 to 230 ° C. This is to make the crests and troughs of each filament easier to connect by increasing the crimp applied to each filament. And the said twisting process is performed by making the number of twists 60-60 t / m. The number of twists is weaker than that for obtaining the conventional twisted yarn. In this way, by adjusting the number of twists to a weak twist and suppressing the processing yarns from tightening each other, it is easy to align the crests and troughs of each filament during the heat treatment step.

  In the twisting step, 4 to 16 processed yarns are twisted. Further, the processed yarn having a thickness of about 165 dtex (150 denier) is used. As a result, the special composite yarn has a thickness of 660 to 6670 dtex (600 to 6000 denier), which is a thicker yarn than the conventional twisted yarn. The processed yarn preferably has a boiling water shrinkage of 8.0% or more and a crimp shrinkage of 35% or more. This is for expanding the gap 14 by heat shrinking the processed yarn during the twisting process.

  The heat treatment step is performed using a plurality of processed yarns twisted in the twisting step and the manufacturing apparatus. In the heat treatment step, the overfeed rate between the first feed roller 21 and the second feed roller 23 is 20 to 100%. In other words, the rotation speed of the first feed roller 21 is increased by 20 to 100% with respect to the second feed roller 23. When the overfeed rate is less than 20%, a tension is applied to the work yarn between the first feed roller 21 and the second feed roller 23, and it becomes difficult to align the peaks and valleys of each filament. On the other hand, when the overfeed rate exceeds 100%, no tension is applied to the processed yarn between the first feed roller 21 and the second feed roller 23, and the peaks and valleys of each filament cannot be aligned. In addition, there is a problem that the processed yarn is clogged between the first feed roller 21 and the second feed roller 23.

  The touch heater 22 is set so that the heating temperature is 220 to 300 ° C. When the heating temperature is less than 220 ° C., the twist applied in the twisting process is not sufficiently maintained, and when the special composite yarn is stretched, the filaments are displaced from each other, and the special composite yarn is in its original state. Can no longer shrink. On the other hand, when the heating temperature exceeds 300 ° C., twists are excessively retained, and problems such as filaments constraining each other or filaments being thermally welded occur.

  The processed yarn under the overfeed condition moves slowly while being rotated so as to roll inside the touch heater 22 by being loosened while being gripped by the first feed roller 21 and the second feed roller 23. At this time, since the plurality of processed yarns are in a weakly twisted state, the twist thereof is slightly loosened, and the crests and troughs of each filament are aligned due to the influence of rotation or the like. And the state where the peaks and valleys of each filament are aligned is heated and held, and a special composite yarn is obtained. In the special composite yarn, the number of the convex portions per 1 m is the same as the number of twists of the multifilament yarn in the twisting process of the false twisting process. This is because the convex portions are formed by connecting filament crests, and the number of filament crests depends on the number of twists in the twisting process of false twisting. Therefore, in the special composite yarn, the number of convex portions per 1 m is 2800 to 3000.

Next, a special composite yarn was produced under the following conditions using the production apparatus shown in FIG.
Processed yarn: 253 decitex (230 denier) / 36 filament multifilament yarn made of polyester with a draw ratio of 1.6, a twist number of 2900 t / m, a heating temperature during twisting of 220 ° C., in a false twisting device False twisted yarn obtained by false twisting under the condition of yarn speed of 100 m / m.

Thread thickness: 165 dtex (150 denier).
Number of processed yarns: 8.
Number of twists in the twisting process: 70 t / m
Touch heater temperature: 215-230 ° C.

Overfeed rate: 20 to 100%.
Yarn speed in the production apparatus: 100 m / m.
Under the above processing conditions, a special composite yarn that is a twisted yarn having great stretchability could be obtained. Further, in this special composite yarn, the number of convex portions per 1 m was 2900.

  A woven fabric is obtained by weaving the special composite yarn produced as described above for at least one of warp or weft, and the special composite yarn is knitted by flat knitting, flat knitting, circular knitting, etc. A knitted fabric is obtained by raising. And since the fabric and knitted fabric using this special composite yarn are soft and light, the texture is improved, and the fabric and knitted fabric with twisted yarn have great stretchability.

The effects exhibited by the above embodiment will be described below.
-According to the special composite yarn of the embodiment, the filaments constituting the yarn form the ridges and recesses by twisting by connecting the peaks and valleys. For this reason, the filaments in which the peaks and valleys are connected to each other do not restrain each other, and further, since gaps are formed between the filaments at the convex portions and the concave portions, based on the applied crimps. Can stretch or contract. Therefore, since each filament can be extended or contracted, the special composite yarn can be expanded and contracted. In addition, since each convex part and each concave part expand or contract, the special composite yarn becomes a yarn having a large stretchability.

  ・ Since the number of protrusions per meter is the same as the number of twists during twisting in false twisting, the number of protrusions is not affected by the number of twists when twisting a plurality of processed yarns. By twisting the processed yarns of the book, the filaments can be restrained from binding each other.

  -In addition, by making the number of twists in the twisting process 60 to 80 t / m at the time of production, setting the overfeed rate to 20 to 100%, and the heating temperature to 220 to 300 ° C, The processed yarn can be twisted together while maintaining the crimp of the filament applied during twisting.

  ・ The processed yarn has a boiling water shrinkage rate of 8.0% or more and a crimp shrinkage rate of 35% or more. Because the gap between the two expands, suitable stretchability can be imparted.

Moreover, by using the special composite yarn, it is possible to obtain a woven fabric or knitted fabric having stretchability while being a woven fabric or knitted fabric by twisted yarn.
In addition, this embodiment can also be changed and embodied as follows.

-As the processed yarn, original yarns colored in different colors may be used. When comprised in this way, the special composite yarn from which hue differs in the whole thread | yarn can be obtained.
-A conventional false twisting device may be disposed upstream of the present embodiment, and the work from the false twisting of the processed yarn to obtaining the special composite yarn may be continued.

Further, the technical idea that can be grasped from the embodiment will be described below.
In the false twisting process, the multifilament yarn is twisted so that the number of twists is 2800 to 3000 t / m, and the twist by this twisting is heated and held under a condition of 215 to 230 ° C. untwisting to the manufacturing method of the special composite yarn you characterized by being performed.

Special composite yarn you wherein the-thickness is 660 to 6670 dtex.

(A) is a schematic diagram which shows the natural state without the tension | tensile_strength of the special composite yarn of embodiment, (b) is a schematic diagram which shows the state which extended the special composite yarn of embodiment. The conceptual diagram which shows the manufacturing apparatus of a special composite yarn.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Special composite yarn, 10a ... Processed yarn, 11 ... Convex part, 12 ... Concave part, 13 ... Filament, 13a ... Filament peak, 13b ... Filament valley, 22 ... Touch heater.

Claims (2)

A method for producing a special composite yarn obtained by twisting a plurality of processed yarns, and having convex and concave portions by twisting alternately in the yarn direction,
The plurality of processed yarns are produced by performing false twisting on each multifilament yarn under the same conditions and crimping each multifilament yarn so as to have the same peak and valley, A twisting process for twisting the plurality of processed yarns, and a heat treatment process for holding the twists by heating the processed yarns after the twisting process under overfeed conditions,
The twisting step is performed with a twist number of 60 to 80 t / m,
The heat treatment step the method for producing a special composite yarn, characterized in Rukoto performed the overfeed rate as 20-100% using a touch heater. The method for producing a special composite yarn according to claim 1, wherein the processed yarn has a boiling water shrinkage of 8.0% or more and a crimp shrinkage of 35% or more .

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