JPS6233334B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention provides a special yarn having knots intermittently along the longitudinal direction of the yarn and having good post-processability in which the knots are fixed without moving or being disturbed. Concerning a method for manufacturing twining yarn. (Prior art) Conventionally, many yarns with knots have been provided on the market because they have a unique appearance and texture when made into fabrics, but if the knots are not fixed properly, it may cause problems in later processes such as winding. The knots were squeezed and moved, resulting in a fabric with poor appearance, and in extreme cases, thread breakage occurred, significantly impeding post-processability. (Problems to be Solved by the Invention) The present invention solves the drawbacks of the conventional manufacturing method for yarn having knots, and provides a method for manufacturing a special entangled yarn in which the knots are stably fixed to the yarn body. The purpose is to provide (Means for Solving the Problems) In order to achieve the above object, the present invention has the following configuration. That is, in the present invention, when drawing and simultaneously false-twisting one or more filament yarns having a structural integrity parameter of 0.3 or more, one or more filaments having a dry heat shrinkage rate of 12% or more are added in the twisted region. The yarn is a sheath yarn, the yarn is fed at a feeding rate that satisfies the following formula, and the structural integrity parameter of the one or more yarns is 0.3.
This is a method for producing a special entangled yarn, which is characterized in that it is intertwined around the filament yarn described above to form knots of sheath yarn intermittently in the longitudinal direction of the yarn. Here, 0.5≦V _A −V _B /V _B ≦4.5, V _A ; feeding speed of filament yarn with a dry heat shrinkage rate of 12% or more, V
_B : Feeding rate of filament yarn with structural integrity parameter of 0.3 or more. The present invention will be explained below with reference to the drawings. The figure is a side view showing an example of an apparatus for carrying out the present invention. One or more filament yarns having a structural integrity parameter of 0.3 or higher are fed to the feed roller 2 as core yarns, although one multifilament yarn Y ₁ is shown in the figure. On the other hand, what is supplied as sheath yarn to the twisting area is filament yarn in which one or more yarns have a dry heat shrinkage rate of 12% or more, but in the figure, one yarn has a dry heat shrinkage rate of 12% or more. Multifilament yarn Y ₂ is shown. Here, filament yarn refers to multifilament yarn or monofilament yarn. The fineness (denier) of the filament yarn that will become the core yarn and sheath yarn should be determined in relation to the desired texture and appearance of the fabric, but generally the fineness (denier) of the filament yarn that will become the sheath yarn is determined by the fineness (denier) of the filament yarn that will become the sheath yarn. When the fineness (denier) of the filament yarn is finer than that of the filament yarn, a special entangled yarn with good texture and appearance can be obtained. The filament yarn serving as the core yarn must have a structural integrity parameter (hereinafter referred to as "epsilon") of 0.3 or more, and must also be thermoplastic and capable of being simultaneously stretched and false-twisted. For example, polyester fiber is used. On the other hand, the filament yarn that becomes the sheath yarn must have a dry heat shrinkage rate of 12% or more and must be thermoplastic and can be subjected to false twisting. For example, polyester fibers, nylon fibers, acrylic fibers, etc. may be used singly or in combination. Furthermore, even if the material is the same, it is possible to combine materials with different dyeability and color tones. The reason why a filament yarn with an epsilon of 0.3 or more was selected as the core yarn is that the filament yarn, which is a sheath yarn, becomes entwined with the core yarn, and the core yarn is stretched by the heater 3, thereby stabilizing the knot. . Here, epsilon refers to the value measured using an epsilon meter (manufactured by Toyobo Engineering Co., Ltd.) under the following conditions. Measure the length (l ₀ ) when a load of 0.2 g/denier is applied to the sample.
After immersing the sample in 80°C warm water for 30 seconds under a load of 0.2 g/denier, the length (l ₁ ) under a load of 0.2 g/denier was measured, and epsilon =
Epsilon is calculated from l ₁ −l ₀ /l ₀ . Next, if V _A is the feeding speed of filament yarn with a dry heat shrinkage rate of 12% or more, and V _B is the feeding speed of filament yarn with epsilon of 0.3 or more, then
0.5≦V _A −V _B /V _B ≦4.5. In the figure, the supply speed V _B corresponds to the surface speed of the feed roller 2, and the supply speed V _A corresponds to the surface speed of the feed roller 9. When V _A - _{V B} /V _B <0.5, the multifilament yarn _Y2 , which is the sheath yarn, is the multifilament yarn, which is the core yarn.
The multifilament yarn Y is simply wrapped around Y ₁ and does not move in the longitudinal direction of the yarn, and the special entwined yarn according to the present invention cannot be obtained. ₂ is cut during stretching. On the other hand, in the case of V _A - V _B /V _B > 4.5, the winding of the multifilament yarn _Y2 becomes loose, and when the drawing and simultaneous false twisting process is applied, the multifilament yarn, which is a high shrinkage yarn as in the present invention, becomes loose. Even if yarn Y ₂ is used, the entanglement is insufficient and the knots (triple entanglements) become unstable. Therefore, the supply speeds V _A and V _B are 0.5≦V _A −V _B /V _B ≦4
By keeping it within the range of .5, when drawing and simultaneous false twisting is performed, the multifilament yarn Y ₂ with a high feeding speed gets entangled with the multifilament yarn Y ₁ with a slow feeding speed while reciprocating, and the reciprocating movement Intermittently multifilament yarn
Y ₂ is triple entwined to form a node (triple entanglement). The supply speed V _A needs to be higher than the stretching ratio during the simultaneous stretching and false twisting process. Barefoot,
This is because if it is too small, stretching will be inhibited. Next, the filament yarn that becomes the sheath yarn must have a dry heat shrinkage rate of 12% or more, preferably 18% or more. For example, multifilament yarn Y ₁
This is because when the multifilament yarn Y2 is stretched by drawing and false twisting, the multifilament yarn _Y2 is contracted by the heat setting of the heater 3, thereby stably fixing the knots to the yarn body. Here, the dry heat shrinkage rate is JIS-
It was measured by the dry heat shrinkage rate B method of L1073 (1965). Note that the false twisting area according to the present invention is preferably between the feed roller 2 and the heater 3 and inside the heater 3, but the former is particularly preferable. In addition, when supplying the sheath yarn to the cooling zone of the false twisting area, the sheath yarn may be heat-treated after the delivery roller 5. (Operation) Next, the operation of the present invention will be explained. In the figure,
Thermoplastic multifilament yarn Y ₁ with an epsilon of 0.3 or more is unwound from package P ₁ ,
It passes through a guide 1 and is supplied to a feed roller 2.
At this time, the multifilament yarn _Y2 having a dry heat shrinkage rate of 12% or more is unwound from the package _P2 , passes through the guide 8, and is supplied to the twisting area by the supply roller 9. At this time, the relationship between the supply speed V _A and the core yarn supply speed V _B is as described above, that is, 0.5≦V _A -V _B /V _B ≦4.5. The multifilament yarn Y ₂ is intertwined intermittently in three layers around the multifilament yarn Y ₁ to form knots, and is then fed to the false twisting spindle 4 through the heater 3 . Tangled multifilament yarn Y ₂
is contracted by the heater 3, and the knots are stably fixed around the multifilament yarn _Y1 . Then, the special entwined yarn passes through the delivery roller 5.
_Y3 is wound onto a package 7 by a drum 6. At this time, the size and pitch of the knots are adjusted by changing the feeding speeds of the feed roller 2 and the feed roller 9. (Example) Example 1 Polyester multifilament yarn 75d/36f as core yarn Y ₁ (structural integrity parameter is 0.2,
0.4), polyester _{multifilament} yarn 75d/36f (dry heat shrinkage rate 10%, 12%,
18%), and the supply speed V _B of core yarn Y ₁ was set to 98 m/
minutes, the sheath yarn Y ₂ was supplied to the core yarn Y ₁ between the feed roller 2 and the heater 3 by changing the supply speed V _A variously, the number of false twists was 2450 T/m, and the feed ratio of the core yarn Y ₁ was +
3%, and was false twisted at a heater temperature of 210°C to produce a special entwined yarn with intermittent knots in the longitudinal direction of the yarn. The morphology of the joints was sensory tested by five sensory testing experts, and stable was marked as ○, while unstable was marked as ×.
Regarding yarn breakage during drawing and temporary twisting, the situation was observed when processing 10 kg of supplied raw yarn. In addition, regarding the appearance of the fabric, the above-mentioned experts will judge whether or not disturbances due to the movement of knots on the surface of the fabric are noticeable.
Conspicuous items are indicated with an x and summarized in Table 1. The fabric used was a plain weave with a density of 27 threads/inch for both warp and weft.

[Table] In Table 1, yarn breakage occurred frequently in No. 1, and knots were not formed. In No. 2, the structure integrity parameter of the core yarn was as small as 0.2, and the dry heat shrinkage rate of the sheath yarn was low, so the form of the knots was unstable. Nos. 3, 7, 8, and 9 had stable joint shapes and good operability. In No. 4 and No. 5, the parameters of the core yarn were low and the shapes were unstable, and in No. 6, the dry heat shrinkage rate of the sheath yarn was low, so the shape of the knots was unstable. (Effects of the Invention) As described above, according to the method of the present invention, the system has knots intermittently along the longitudinal direction, and the knots are stably fixed to the core yarn without moving or being disturbed. A remarkable effect is achieved in that the special entangled yarn produced by the method can be manufactured without the need for complicated equipment.

[Brief explanation of the drawing]

The figure is a side view showing an example of an apparatus for carrying out the present invention. Y ₁ ... Multifilament yarn with an epsilon of 0.3 or more, Y ₂ ... Multifilament yarn with a dry heat shrinkage rate of 12% or more, 2 ... Feed roller, 4 ... False twist spindle, 5 ... Delivery roller, 9 ...Supply roller, Y ₃ ...Special entangled yarn.

Claims (1)

[Claims] 1. When one or more filament yarns having a structural integrity parameter of 0.3 or more are drawn and simultaneously false-twisted, one or more filament yarns in the twisted region have a dry heat shrinkage rate of 12% or more. The filament yarn is fed as a sheath yarn at a feeding rate that satisfies the following formula, and is intertwined around the one or more filament yarns whose structural integrity parameter is 0.3 or more, and is intermittent in the longitudinal direction of the yarn. A method for producing a special twining yarn characterized by forming knots with sheath yarn. [0.5≦V _A −V _B /V _B ≦4.5 V _A : Feeding speed of filament yarn with dry heat shrinkage rate of 12% or more, V _B : Structural integrity parameter is 0.3
Feeding speed of filament yarn which is above]