JPS6234852B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention provides a 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. This invention relates to a method for manufacturing 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 method for producing yarn having knots, and provides a method for producing 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 false twisting one or more filament yarns as a core yarn,
One or more filament yarns with a dry heat shrinkage rate of 12% or more with a difference of less than 3% from the dry heat shrinkage rate of the core yarn are fed into the twisted region as sheath yarns at a feeding speed that satisfies the following formula. This is a method for producing a twining yarn, characterized in that knots are intermittently formed by the sheath yarn in the longitudinal direction of the yarn by twining the filament yarn with the one or more filament yarns. Here, 0.2≦V _A −V _B /V _B ≦3.0, V _A is the feeding speed of one or more filament yarns with a dry heat shrinkage rate of 12% or more, V _B is the feeding speed of one or more filament yarns. be. 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 implementing the present invention. One or more filament yarns are fed as core yarns to the feed roller 2, although one multifilament yarn _Y1 is shown in the figure. On the other hand, what is supplied as a sheath yarn to the twisting area is one or more filament yarns with a dry heat shrinkage rate of 12% or more, preferably 18% or more, but in the figure, one filament yarn with a dry heat shrinkage rate of 12% or more is used.
Multifilament yarn preferably 18% or more
Y ₂ is shown. The dry heat shrinkage rate of the sheath yarn is set to 12% or more in order to stably entangle the sheath yarn around one or more filament yarns serving as the core yarn through heat shrinkage. In this sense, 18% or more is preferable. On the other hand, as for the dry heat shrinkage rate of the core yarn, in order to stabilize the entanglement between the sheath yarn and the core yarn through heat shrinkage, the difference in dry heat shrinkage rate between the two is set to 3%. However, it is preferable that the diameter of the core yarn is smaller than that of the sheath yarn. Here, the dry heat shrinkage rate is
It was measured by the dry heat shrinkage rate B method of JIS-LI073 (1965). In addition, when there are two or more filament yarns constituting the core yarn, or when there are two or more filament yarns constituting the sheath yarn, the one with the largest dry heat shrinkage rate among the core yarns is used as the dry heat shrinkage rate.
We will select the yarn with the smallest dry heat shrinkage rate among the sheath yarns as a standard, and discuss the difference in dry heat shrinkage rate between the core yarn and the sheath yarn. Note that the filament yarn referred to herein refers to a multifilament yarn or a monofilament yarn. Furthermore, except for the dry heat shrinkage rate, the material of the twining yarn and core yarn may be any thermoplastic filament yarn that can be false-twisted, and may be made of polyester, nylon, acrylic, etc. singly or in combination. used. Furthermore, even if they are made of the same material, they can be combined with different dyeing properties and tones. Also,
The fineness (denier) of the sheath yarn and core yarn should be determined in relation to the required texture and appearance of the fabric, but in general, the fineness (denier) of the sheath yarn is thinner than that of the core yarn. Both texture and appearance are good. Furthermore, if V _A is the supply speed of one or more filament yarns with a dry heat shrinkage rate of 12% or more that will become the sheath yarn, and V _B is the supply speed of one or more filament yarns that will be the core yarn, then 0.2≦V _A −V _B /V _B ≦3.0. If V _A - V _B /V _B <0.2, the sheath yarn merely wraps around the core yarn and does not move in the longitudinal direction of the yarn, and stable knots as in the present invention are not formed. On the other hand, in the case of V _A - V _B /V _B > 3.0, the way the sheath yarns are entangled becomes loose, and even if high shrinkage yarn is used as in the present invention, the entangled state is insufficient and the stability of the knots is poor. It becomes something missing. Furthermore, the twisting region according to the present invention is preferably between the feed roller 2 and the heater 3 and inside the heater 3, and particularly preferably between the feed roller 2 and the heater 3. Knots (triple entwined parts) are formed by the sheath threads entwined with the core thread.
This is because the knots are heat-treated by the heater 3, thereby stabilizing the entanglement with the core yarn. Of course, in the case where the sheath yarn is supplied between the heater 3 and the false twist spindle 4, the sheath yarn may be heat-treated after the delivery roller 5. In this way, the sheath yarns are entangled with each other while reciprocating around the core yarn to form knots, which are heat set by the heater 3, thereby contracting the yarn and stabilizing the entanglement with the core yarn. (Function) Next, the function of the present invention will be explained. In the figure, one multifilament yarn Y ₁ is unwound from a package P ₁ and supplied to a guide 1 , a feed roller 2 , a heater 3 , and a false twist spindle 4 . On this occasion,
A single multifilament yarn _Y2 with a dry heat shrinkage rate of 12% or more is unwound from a package _P2 , passes through a guide 8, is supplied to a twisting area by a supply roller 9, and is a single multifilament yarn in the twisting area. Entwined with thread Y ₁ . At this time, the feeding speeds of the feed roller 2 and the feed roller 9 are adjusted in consideration of the size and pitch of the joints. Needless to say, there is a relationship of 0.2≦V _A −V _B /V _B ≦3.0 between the supply speed V _A and the feed speed V _B . Multifilament yarn Y ₂ , which is a sheath yarn and has a dry heat shrinkage rate of 12% or more, is intermittently entwined in three layers around the multifilament yarn Y ₁ , which is a core yarn, to form knots, and then passed through a heater 3 to a false-twisting spindle. 4. Tangled multifilament yarn
_Y2 is contracted by the heater 3, and the knots are stabilized around the multifilament yarn _Y1 . After passing through the delivery roller 5, the sheath yarn 3 is then wound onto a package 7 by a drum 6. (Example) Example 1 Polyester multifilament yarn 75d/36f was used as core yarn _Y1 , polyester multifilament yarn 75d/ _36f was used as sheath yarn Y2, and core yarn _Y1
The supply speed V _B of is 98 m/min, the supply speed V _A of the sheath yarn Y ₂ is varied, and the core yarn Y ₁ is supplied between the feed roller 2 and the heater 3, and the number of false twists is 2450 T/m.
Feed ratio of core yarn Y ₁ +3%, heater temperature 210℃
The yarn was false-twisted to produce a entwined yarn with knots intermittent in the longitudinal direction of the yarn. In order to judge the stability of the knots obtained, the number of threads cut while turning 10 kg of cheese at a speed of 60 m/min, and whether the knots were stable or not was determined by five sensory testing experts. The above-mentioned expert judged whether or not the surface of the fabric was noticeably disturbed by movement of knots, and the results are summarized in Table 1. In addition, the core thread
The dry heat shrinkage rates of Y ₁ and Y ₂ were varied as shown in Table 1. The fabric used was plain weave with a density of 27 threads/inch in both warp and weft.

[Table] The form of the knots is indicated as 〇: stable, ×: unstable. Also, regarding the appearance of the fabric, 〇: the disturbance is not noticeable at all, △: the disturbance is slightly noticeable, ×: the disturbance is noticeable It was displayed in In Table 1, in No. 1, the sheath yarn Y ₂ does not move around the core yarn Y ₁ and the shape of the knots is unstable because it is wound, and the appearance of the fabric is also slightly disordered at the knots. Ta. In No. 2, the difference in dry heat shrinkage rate exceeded 3%, and therefore the shape of the knots was unstable. As a result, the appearance of the fabric was noticeably disordered. No.3～
In No. 5, both the dry heat shrinkage rate difference and the relationship between supply speeds satisfied the requirements of the present invention, and the shape of the knots was also stable.
The same was true for No.7. No.6 has a dry heat shrinkage rate of 3%
Therefore, the joints were not stable even by heat shrinkage. In No. 8, the feeding speed of the sheath yarn was too high and the sheath yarn was wound loosely around the core yarn, so that the form of the knot was unstable. (Effects of the Invention) As described above, according to the method of the present invention, the yarn has knots intermittently along the longitudinal direction, and the knots can be stably attached to the core yarn without moving or being disturbed. A significant advantage is that fixed sheath yarns are produced without the need for complex 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 ……1 multifilament yarn, Y ₂ ……
1 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.

Claims (1)

[Scope of Claims] 1. When false twisting one or more filament yarns as a core yarn, one or more dry heat shrinkage fibers with a difference in dry heat shrinkage rate of less than 3% from the dry heat shrinkage rate of the core yarn in the twisted region. A filament yarn with a ratio of 12% or more is fed as a sheath yarn at a feeding speed that satisfies the following formula, and is entangled with the one or more filament yarns to intermittently form knots with the sheath yarn in the longitudinal direction of the yarn. 1. A method for producing a tangled yarn, characterized by forming a tangled yarn. [0.2≦V _A −V _B /V _B ≦3.0 V _A : Feeding speed of one or more filament yarns having a dry heat shrinkage rate of 12% or more V _B : Feeding speed of one or more filament yarns].