JPH0336940B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a new knotted yarn having a special appearance and form made from filament yarn using a false twisting and crimping device, and a method for manufacturing the same.

Conventionally, many methods have been proposed in which knots are formed by winding a sheath yarn around a core yarn while continuously processing a thermoplastic filament yarn by false twist crimp processing. For example, in Japanese Patent Publication No. 50-35147, two types of filaments were introduced into a false twisting device, one yarn was constantly supplied as a core yarn, and the amount of the other yarn was intermittently changed to create a core yarn. It is shown that a knotted yarn having a multiple winding portion in which the sheath yarn is spirally wound three times or more around the yarn is manufactured.

The inventors tried this method again, but it became clear that the yarn produced had weak entanglement between the knots and the core yarn, unstable fixation of the knots, and many troubles during the weaving process. It became. In addition, since the sheath yarn that forms the knots is always with one thread, there is little variation, which is extremely unsatisfactory when diversity is desired, such as with design yarns manufactured using a design twisting machine. Ta.

The present invention aims to eliminate the above-mentioned drawbacks, and provides a new knotted yarn with a unique appearance and form that has never existed before, and a manufacturing method that allows this knotted yarn to be easily produced at low cost in a single step of false twisting. It provides:

That is, the knotted yarn of the present invention is a knotted yarn made by false twisting and crimping two types of thermoplastic synthetic filament yarns to form knots at appropriate intervals in the longitudinal direction, and the two types of yarns have knots formed at appropriate intervals in the longitudinal direction. At least one of the yarns is made of different colored threads or spun-dyed yarns of different colors, and at one knot,
The two types of yarns form a multiple winding portion, the core yarn and the sheath yarn alternate with each other, and the twist direction is alternately and intermittently reversed along the yarn axis. As a result, not only does the non-knotted part have a heathered effect, but the color changes especially in a single knotted part, giving a unique effect and an elegant design style yarn can be provided. In addition, this method for producing knotted yarn involves simultaneously false twisting and crimping two types of thermoplastic synthetic filament yarns, at least one of which is a different dyed yarn or a different colored spun-dyed yarn. The yarn is over-fed at a constant rate, the other yarn is pulled out through a tension adjustment device while maintaining a predetermined tension, and both yarns are joined at an obtuse angle to add twist, and the twist of both yarns is It is characterized by displacing the confluence point of both yarns to the left and right by changing the relative tension associated with rotation, which makes it possible to easily and reliably create knotted threads that have the above-mentioned special design effect. Moreover, the knotted yarn has a firm winding at the knotted part and does not shift during the weaving and weaving process due to ironing.

Next, specific examples of the present invention will be described in detail with reference to the drawings. First of all, FIG. 1 shows an explanatory view of the entire apparatus for producing the knotted yarn of the present invention. The fibers are twisted by a false twisting spindle 3 and heat treated by a heater 4, then untwisted between a heating spindle 3 and a twisting roller 5, and then being twisted by a winding roller 6.
The threads are wound around the cheese 7 as knotted threads. In this case, a drawn polyester filament yarn is used as the yarn A, and a drawn yarn of a cationically dyeable polyester filament is used as the yarn B, and both yarns A and B have different dyeing properties. ing. Yarn A supplied from package 1
is +40 to + by the supply roller 8 through the guide.
The yarn B is fed out at a constant overfeed rate within a range of 80%, and the yarn B supplied from the other package 2 is pulled out through a tension adjustment device 9 so as to maintain a constant tension. .

This tension adjustment device 9 is designed so that the yarn B being pulled out is brought into contact with the rotating tensor blade once, and a certain brake is applied to the rotation of the tensor blade using electromagnetic force, so that the yarn B is pulled out. Although it is preferable to have a structure that keeps the tension of the strip B constant, devices with other structures may also be used.

And both threads A and B are at an obtuse angle, preferably 100°~
They meet at 140° and are twisted by the false twisting spindle 3, but the number of false twists in this case is determined by the Heberlein formula used to produce ordinary false twisted yarn, that is, the resulting yarn. If D is the denier number of /
m) is within the range of <2.2T.

The knotted yarn of the present invention can be manufactured using the apparatus and conditions described above, and the formation process will now be explained with reference to FIGS. 2 to 4. Fig. 2 is an exploded view showing changes in displacement of yarn A and B over time, Fig. 3 is a waveform diagram showing changes in tension of both threads A and B over time, and Fig. 4 2 is an analysis diagram of the knotted portion of the produced knotted yarn, and FIGS. 2 to 4 are shown in a time-corresponding state, respectively.

First, the tension of yarn A (T ₁ ) and the tension of yarn B (T ₂ )
If they are equal, both yarns A and B are in the state shown in Fig. 2A, but even though yarn B is naturally pulled out through the tension adjustment device 9 to maintain a predetermined tension. On the other hand, since yarn A is fed at a predetermined overfeed rate by the supply roller 8, the tension (T ₁ ) of yarn A is relatively lower than that of yarn B, and as shown in FIG. As shown in (b), yarn B having a high tension (T ₂ ) is wound around the core yarn in multiple layers. At that time, as the tension of yarn A, which is wound multiple times, increases, the confluence point of both yarns changes from O _1.
Displaced to P ₁ . When the limit is reached, the confluence point is displaced from P ₁ to O ₁ while pulling the yarn B, forming a knot. Even in this state, yarn A continues to be wound multiple times around yarn B, so that the diameter of the node gradually increases, and the amount of biting of yarn A increases. However, since yarn A is fed at a constant overfeed rate by the supply roller 8, the amount of supply becomes insufficient, the tension (T ₁ ) of yarn A increases rapidly, and the tension of yarn B increases. It becomes relatively large compared to the tension (T ₂ ). As a result, the core yarn and sheath yarn suddenly reverse, resulting in the state shown in Figure 2 C, and contrary to the above, the yarn B with the lower tension (T ₂ )
However, the thread A, which has a higher tension (T ₁ ), is suddenly drawn to the side of the thread A, and the amount of pull-out increases, and the thread A, which has a higher tension (T ₁ ), is wound around it as a core thread. . As yarn B is wound multiple times and its tension increases, the confluence point of both yarns A and B becomes _O2.
When the limit is reached, yarn A is pulled and the confluence point of both yarns A and B is displaced from _{P 2 to} O ₂ . However, yarn B is pulled out passively and arbitrarily through the tension adjustment device 9, so it does not suddenly become tensioned, and yarn A is fed at a constant overfeed rate, so its tension ( _T1 )
will gradually decrease, and the state will shift to the state shown in Figure 2A, where the tensions (T ₁ ) and (T ₂ ) of both yarns A and B are equal. From this state, yarn A is over-supplied, so its tension (T ₁ ) becomes low, and along with this, the tension (T ₂ ) of yarn B, which is pulled out through the tension adjustment device, becomes relatively high. As I get older,
As a result, yarn A is again wound around yarn B multiple times.

After that, the same process as above is irregularly repeated by displacing the confluence point of both yarns A and B to the left and right by the relative tension change accompanying the twisting action of both yarns. At the node, the core thread and sheath thread are reversed to form a knot thread. Figure 4 shows an analysis diagram of the vicinity of the knot, and as shown in the figure, in the obtained knot, yarn B first becomes a core yarn, and yarn A is wound around it as a sheath yarn in a single layer. A single-wound part (a) is formed, followed by a triple-wound part (b) in which thread A is triple-wound as a sheath thread around thread B as a core thread.
Then, the core-sheath is reversed, yarn A becomes the core yarn, and yarn B is triple-wound around it, creating a triple-wound part (C ) is formed, and then a single-wound part (d) is formed in which thread A is used as a core thread and thread B is wound around it in a single layer as a sheath thread. Note that the core-sheath is then reversed again to form a single-wound portion (a) similar to the above.

In addition, in the above example, the confluence angle (θ) at the confluence point (O) (O ₁ ) (O ₂ ) of both yarns A and B
The reason why (θ ₁ ) (θ ₂ ) is made obtuse, especially 100° to 140° is because
If the confluence angle (θ) (θ ₁ ) (θ ₂ ) is acute, the knots formed will be very weak and easily shift due to ironing, which will cause problems in the weaving process. be. If the confluence angle (θ) (θ ₁ ) (θ ₂ ) of both yarns A and B is greater than 140°, the false twisting operability is extremely poor and it becomes almost impossible to form knots.

Also, increase the overfeed rate of one yarn A by +40
The reason for setting it to +80% is that if the feed rate is less than +40%, it is almost impossible to form knots, and even if they are formed, their length will be very short and they will become nep-like knots. It's for a reason. On the other hand, if the feed rate is +80% or more, knots are formed, but the false-twisting operability is very poor and yarn breakage occurs frequently.

Furthermore, as mentioned above, the number of false twists (N) is set to 1.9 to 2.2 times the number of twists (T) determined by Heberlein's formula, which is used when manufacturing normal false twisted yarns. If the number of false twists (N) is smaller than this range, the produced knotted yarn will have many loops and fuzz, and the knots will be easily misaligned.On the other hand, if the number of false twists (N) is larger than this range, This is because thread breakage occurs frequently during manufacturing.

As explained above, in the knotted thread of the present invention, the core thread and the sheath thread are reversed in a single knotted part, so that the winding of the knotted part becomes firm. Especially the constituent materials 2
Since at least one of the seed yarns A and B is composed of a different color yarn or a different colored spun-dyed yarn,
The non-knotted part has a heathered look, and even in a single knotted part, the color changes by reversing the core thread and sheath thread, resulting in an unprecedented knotted thread rich in elegance with a unique iridescent effect.

Next, examples of the present invention will be described.

Example 1 Yarn A was 50d/24f cationic dyeable polyester drawn yarn, and yarn B was 50d/24f.
Using the drawn polyester yarn of 2000, a knotted yarn was produced using the crimping and false twisting processing apparatus shown in FIG. 1 under the following conditions.

Spindle rotation speed 185000rpm Number of false twists 4300T/M (Z direction) Heater temperature 215° Yarn A feed rate +40% Set standard tension of yarn B (T ₂ ) 5g Knotted yarn manufactured under conditions of 140d or more and has a solid 4~ shape as shown in Figure 4.
The number of 7mm knots was 14/m. When the fabric woven with this knotted yarn as the weft was dyed in a mixed bath of disperse dye and basic dye,
A cyantan-like fabric rich in elegance and an iridescent pattern with a very decorative design on the entire surface of the fabric was obtained.

Example 2 Using a 50d/24f black spun-dyed polyester drawn yarn as the thread A and a 50d/24f drawn polyester thread as the thread B, the following was carried out using a crimping and false twisting processing device as shown in Fig. 1. The knotted yarn was produced under the following conditions.

Spindle rotation speed 185000rpm Number of false twists 4450T/M (Z direction) Heater temperature 215℃ Yarn A feed rate +50% Setting standard tension of yarn B (T ₂ ) 3g Due to the above, it has a fineness of 151d and the 15 pieces/m of solid 5-10mm knots as shown in the figure.
The knotted threads present at a ratio of . The fabric that was woven with this as a weft was a pongee-like fabric with a black and white marbling tone.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the entire device used to carry out the present invention, Figure 2 is an exploded view showing the displacement of the confluence point of yarn A and yarn B over time, and Figure 3 is an exploded view of both yarns. Waveform diagram showing changes in tension of strips A and B over time, No. 4
The figure is an analysis diagram of the knotted portion of the knotted thread of the present invention. A, B... Yarn, 9... Tension adjustment device.

Claims (1)

[Scope of Claims] 1. A knotted yarn formed by false twisting and crimping two types of thermoplastic synthetic filament yarns to form knots at appropriate intervals in the longitudinal direction, wherein the two types of yarns are At least one of the yarns is made of a different dyed yarn or a different color dyed yarn, and at one node, the two types of yarns form a multiple winding part, and the core yarn and sheath yarn are mutually replaced, and the yarn A knotted yarn characterized in that the twist direction is intermittently reversed along the longitudinal direction. 2. When simultaneously false twisting and crimping two types of thermoplastic synthetic filament yarns, at least one of which is a discolored yarn or a spun-dyed yarn of a different color, one of the two types of yarns is over-supplied at a constant rate. , the other yarn is pulled out through a tension adjustment device while maintaining a predetermined tension, and both yarns are joined at an obtuse angle to add a twist, and the relative relationship due to the twisting action of the two yarns is A method for producing knotted yarn, characterized by displacing the joining point of both yarns to the left and right by changing tension. 3 The overfeed rate of one yarn is +40~
2. The method for producing a knotted yarn according to claim 2, wherein the yarn is +80%. 4. The method for producing a knotted yarn according to claim 2, wherein the number of false twists (N) is in the range of 1.9T<N(t/m)<2.2T. However, T is a value determined by Heberlein's formula, T=275000/D+60+800, and D in the formula is the denier number of the obtained knotted yarn.