JPS6234853B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an improvement in the manufacturing method of slub yarn. Conventionally, slub yarns in which thick and thin yarns are imparted in the longitudinal direction have been widely used as an effective means for imparting the appearance of fabrics. In particular, in recent years, reflecting the natural fiber-oriented market, an approach has been taken to produce these yarns from thermoplastic continuous multi-filament yarns. Looking at this from a patent perspective, for example,
28258, 45-28018, 47-49459, 50-35147
Many proposals have been made. However, in order to satisfy the convergence of the effect yarn (over-supplied yarn) and the core yarn (to prevent shearing of the slab portion), a high heater temperature condition is adopted. Therefore, it has been extremely difficult to express the drapability of silk slabs. The present inventors paid attention to this point and conducted various studies. As a result, when oversupplying and winding effect yarns from thermoplastic multi-filament yarns that have been false-twisted using a false-twisting method, the present inventors found that We have discovered a manufacturing method that produces yarn with excellent drapability and no slippage in the slab portion, which was previously unobtainable, by processing it under certain conditions. That is, the gist of the present invention is to oversupply effect yarn B made of other thermoplastic multifilament yarns to the twisting region of core yarn A made of thermoplastic multifilament yarns during false twisting. When winding around yarn A, the twist coefficient when twisting core yarn A is 15,000 to 19,000, and the overfeed rate of effect yarn B is 40 to 19,000.
90%, the softening points of core yarn A and effect yarn B are T _A and T _B respectively.
(℃), the false twisting process is performed at a heater temperature T _P (℃) that simultaneously satisfies the formulas 0.90T _A ≧ _TP ≧0.50T _A and 0.90T _B ≧ _TP ≧0.50T _B. It is in the manufacturing method of slub yarn. The present invention will be explained in detail below with reference to the drawings.
The figure is a side view showing an example of a device used for carrying out the present invention. In the figure, core yarn A is false twisted by a twisting device 3 installed between a first supply roller 1 and a take-up roller 2. Ru. On the other hand, the effect yarn B is fed to the core yarn A by the second supply roller 4.
The core yarn A is over-supplied to the twisting region of the core yarn A, and is wound around the core yarn A to form a slab portion, which is then set by the hot plate 5. In general false twisting, there is a method for imparting drape properties that involves processing at a low number of false twists and at a low false twisting heater temperature, but it is not possible to simply apply this method to the production of slub yarns such as the present invention. Yarns with good slub cohesiveness can never be obtained. Tables 1 and 2 show the relationship between the processing conditions when polyester multifilament yarn is used as the core yarn A and the effect yarn B, and the bundleability and drapability of the resulting slub yarn. Tables 4 and 4 show similar relationships when acrylic multi-filament yarn is used as core yarn A and effect yarn B, and Tables 5 and 6 show polyester multi-filament yarn as core yarn A. , which shows a similar relationship when an acrylic multi-filament yarn is used as the effect yarn B. In each of the above tables, the number of false twists T is the number per meter, the twist direction is the Z direction, and the twist coefficient α is calculated using the formula α
= T√ [where D is the denier of the core yarn A], and the overfeeding rate of the effect yarn B is determined by the formula [(peripheral speed of second supply roller 4 - circumferential speed of take-up roller 2)/take-up The circumferential speed of roller 2]×100%.

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[Table] From these results, when A is false-twisted alone under conditions that have sufficient convergence (no deviation in the slab part) and excellent drape properties, the false twist and twist coefficient is 15,000~
19000, the oversupply rate of B is 40 to 90%, and when the softening points of A and B are respectively T _A and T _B (°C), 0.90T _A ≧T _P ≧0.50T _A 0.90T _B ≧T _P ≧ It turns out that processing can be done at a heater temperature T _P (°C) that satisfies 0.50T _B at the same time. In addition, the softening point here is polyester = 238
°C, acrylic film = 190 °C, triclotate = 250 °C, nylon-6 = 180 °C, nylon-
66=230℃. Specific examples will be described below. Example 1 Both the core yarn A and the effect yarn B are polyester multi-filament yarns, A is an SD48/36 drawn yarn, B is an SD28/12 drawn yarn, and the false twisting model LS-5 (manufactured by Mitsubishi Heavy Industries, Ltd.) was used. After processing, the number of false twists of A is 2260T/M (twisting coefficient 15658), the twisting direction is Z, the applied tension is 5.5g, the overfeed rate of B is 70%, the first heater temperature is 170℃, and the yarn speed is 89m/min. When evaluated, it was found to be a fabric with extremely excellent focusing and drapability. Yarns obtained under the same specifications with other conditions being the same and the first heater temperature at 220°C were compared, but the drapability was not satisfactory. Example 2 Polyester SD73/36 drawn yarn as core yarn A,
Triacetate SD60/30 was used as overfeeding yarn B, false twist number of A was 1980T/M (twisting coefficient 16917), twisting direction Z, twisting tension was 7.0g, overfeeding rate of B was 60%, first heater temperature was 160°C. The yarn speed was 98 m/min, and the machine was processed as LS-5. When the obtained yarn was plain woven, both the bundling property and the drapability were good. As a comparative example, the number of false twists was 2400T/M (twist coefficient
20506) and other conditions were the same, the result was a slub yarn with extremely poor cohesiveness.

[Brief explanation of the drawing]

The figure is a side view showing an example of the device used to carry out the present invention. In the figure, A is a core yarn, B is an effect yarn,
1 is a first supply roller, 2 is a take-up roller, 3 is a false twisting device, 4 is a second supply roller, and 5 is a first heater.

Claims (1)

[Claims] 1 When winding around core yarn A by overfeeding effect yarn B made of another thermoplastic multifilament yarn to the twisting region of core yarn A made of thermoplastic multifilament yarn during false twisting, the core yarn When the twist coefficient during twisting of A is 15,000 to 19,000, the oversupply rate of effect yarn B is 40 to 90%, and the softening points of core yarn A and effect yarn B are respectively T _A and T _B (°C), Formula 0.90T _A ≧T _P
A method for producing slub yarn characterized by false twisting at a heater temperature T _P (°C) that simultaneously satisfies ≧0.50T _A and 0.90T _B ≧T _P ≧0.50T _B.