JPH0346566B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a bulky processed polyester composite yarn that has loops, slack, or fuzz and has good anti-pilling properties. Conventionally, it has been pointed out that woven or knitted fabrics using filament yarns made of synthetic fibers have drawbacks such as smooth surfaces, lack of bulge, and lack of elasticity. Therefore, in order to eliminate these drawbacks and obtain a spun-like texture, various napping methods have been proposed in which the filament yarn is fluffed (Japanese Utility Model Publication No. 29-9941).
Publication No. 48-305, Japanese Patent Publication No. 1973-
(See Publication No. 151646). Among the above methods, the former two methods simply fluff the filament yarn, and the latter method creates a processed yarn with a core-sheath structure in which two filament yarns are mixed and intertwined with a difference in thread length. This is a method that mainly involves fluffing the sheath threads. On this occasion,
The materials used for the core yarn and the fluffed sheath yarn are not particularly limited, but polyester filament yarn is currently often used because of its good wash and wear properties. However, such composite processed yarns with fluff generally suffer from pilling and pilling caused by entanglement of fluff.
That is, there is a tendency for pill formation to occur frequently, and this tendency is particularly noticeable in the case of strong fibers such as polyester filament yarn. The occurrence of such pills occurs when spun-like polyester filament yarn is used for clothing.
This has become one of the biggest practical drawbacks. In particular, it has been almost impossible to advance into the field of flat knit sweaters. In order to prevent the occurrence of pills, various methods have been tried in the past.
Japanese Patent Publication No. 47-31399 proposes a method of treating polyester fibers with an aqueous solution containing a specific quaternary ammonium compound and an alkaline substance. However, these methods not only have drawbacks in the manufacturing process such as decreased spinnability and long processing times, but also the resulting filament yarn has insufficient anti-pilling properties. If the knitted fabric has a loose structure after being processed, it will be completely unusable. In order to solve these problems, the present inventor conducted various studies on the physical properties of the sheath yarn to which the fluffing process is applied, and found that if the sheath yarn is composed of filaments with a specific high-crystalline and low-orientation structure, the fluffing process is possible. The present invention was achieved based on the discovery that it is easy to use and has a remarkable effect on improving the anti-pilling properties of fluff. That is, the present invention relates to a bulky textured yarn in which two or more filament yarns are mixed and entangled with a difference in yarn length, and in which the sheath yarn is mainly formed of loops, slack, or fluff. The filaments constituting the sheath yarn have ethylene terephthalate as the main repeating unit, and -SO ₃ M group (M
is a bulky textured yarn which is made of polyethylene terephthalate copolymerized with a compound having an alkali metal) and which satisfies the following (a) to (c) at the same time. (a) Crystallinity (xρ) 30-55% (b) Orientation degree (Δn) 0.06-0.12 (c) xρ/Δn 350-650 The present invention will be further explained. In general, the structure of commonly used polyester filaments has a high degree of molecular chain orientation and high molecular chain density in the amorphous portion, which increases the filament strength and reduces pill resistance. . On the other hand, the polyester filament constituting the sheath yarn of the bulky yarn of the present invention is sufficiently crystallized, and the degree of molecular chain orientation and molecular chain density of the amorphous portion thereof are both lower than those of ordinary polyester filament. As a result, such filaments have low strength and low elongation, exhibiting excellent anti-pilling properties and napping properties.
Furthermore, in the present invention, by defining the crystallinity and molecular chain orientation (birefringence) of the filament within a specific range, troubles in the filament manufacturing process can be prevented and other filament This is done so that the physical properties are not impaired. In the present invention, the filament yarn having excellent anti-pilling properties and napping properties covers the surface of the composite processed yarn which has been mixed and entangled with the core yarn as a sheath yarn while forming loops, slack or fuzz. That is essential. A filament yarn with such excellent pill resistance needs to be composed of filaments having the following characteristics (a), (b), and (c). (a) Crystallinity (xρ) 30-55% (b) Birefringence (△n) 0.06-0.12 (c) xρ/△n 350-650 where xρ is less than 30% or △n is less than 0.06 In the case of filaments, the elongation of the filaments increases, resulting in a decrease in napping properties and anti-pilling properties. On the other hand, when xρ exceeds 55%, the strength of the filament decreases too much and it becomes brittle, which tends to cause problems such as thread breakage in the filament manufacturing process.When Δn exceeds 0.12, the filament becomes stronger and its anti-pilling properties decrease. Moreover, when such a high-strength filament is used to make a woven or knitted fabric, the texture of the woven or knitted fabric becomes hard. Furthermore, even if conditions (a) and (b) above are satisfied,
If the value of xρ/△n is less than 350, the filament will have poor handling and durability, and cannot be put to practical use.On the other hand, if the value exceeds 550, problems such as fuzz will occur during the filament manufacturing process. occurs. Methods for manufacturing filaments having such physical properties include a method of crystallizing and stretching melt-spun undrawn yarn, or a method of heating and crystallizing spun yarn that is taken off at high speed while rapidly cooling the yarn discharged from a spinneret. obtained by. Moreover, such filaments have ethylene terephthalate as the main repeating unit, and −SO ₃ M
It consists of polyethylene terephthalate copolymerized with a compound having a group (M is an alkali metal). In polyethylene terephthalate into which this -SO ₃ M group has been introduced, the -SO ₃ M group functions to suppress the orientation of the molecular chains in the amorphous part, and during polymerization, the -SO ₃ M group-containing compound is It is preferable to add and copolymerize 1 to 5 mol% of the total terephthalic acid component. Furthermore, it is necessary that the filament, which has excellent anti-pilling properties as described above, is mixed and entangled with the sheath yarn and the core yarn in which loops, slacks or fuzz are formed. If this mixed fiber entanglement is not given, the loop,
This is because sagging, especially fluff, easily disappears and falls off when exposed to external forces such as "straining." In addition, the filament yarn used for the core yarn of the present invention is
It may be the same filament yarn as the sheath yarn, or it may be a conventionally used polyethylene terephthalate filament yarn, polybutylene terephthalate filament yarn, nylon filament yarn, etc., and can be freely used depending on the purpose of use of the composite processed yarn. good. Next, the method for obtaining the bulky yarn of the present invention will be explained using a specific example. FIG. 1 shows an embodiment of manufacturing the bulky yarn of the present invention, in which 1 represents the sheath yarns (a), (b) and (c).
2 is a polyester filament yarn serving as a core yarn, which is supplied under overfeed to a fluid agitation nozzle 5 via supply rollers 3 and 4, respectively, to become a loop yarn 6, and then to an intermediate yarn. After being fluffed by a rubbing fluffing body 8 under tension between the roller 7 and the delivery roller 9, it is wound up by a winder 10. In this case, changing the overfeed amount of the core yarn and sheath yarn will change the bulkiness and texture of the processed yarn, so the overfeed amount can be determined appropriately depending on the purpose and application, but the mixed fiber From the viewpoint of stability of entangling process, overfeed amount of core yarn should be 5~5.
It is desirable that the sheath yarn has a yarn difference of 7 to 40% compared to the core yarn. Further, as the fluid stirring nozzle, the nozzles described in Japanese Patent Publication No. 34-8969, Japanese Patent Publication No. 1673-1973, and Japanese Patent Publication No. 47-4206, which are well known in the field, may be used. In addition, as shown in Figure 1, the raising process can be carried out continuously using a rubbing and raising body after the fiber-mixing and entangling process, or by winding the yarn in the form of a loop, knitting it, and then raising it using a raising machine. Any method may be used, and the degree of napping may be determined as appropriate depending on the purpose and use. still,
Although this napping is not necessarily necessary, it is preferable to cut some or all of the loops to create fluff, as this provides a better texture and reduces the fastener phenomenon (a phenomenon in which the fabric bunches up). Normally, the fluff is more prone to pilling than the loop, but the yarn of the present invention has an excellent anti-pilling effect, so the effect is even more effective when raised. As described above, according to the bulky yarn of the present invention, it is possible to enter the field of polyester flat knit sweaters, which was previously impossible, and a material with a good texture can be obtained. Hereinafter, the present invention will be described in detail with reference to Examples. Example 1 5-Sodium sulfoisophthalate component: 2.6
Polyester filament yarn (150 de /
48fils) as the sheath yarn, and polyester filament yarn (150de/
48fils) was supplied as a core yarn to a Taslan nozzle under the following conditions to form a loop yarn, and then raised with a 100-mesh rotating grindstone to obtain a fluffy yarn with uniform short fluff and high bulkiness. . Overfeed amount of sheath yarn 1: 40% Overfeed amount of core yarn 2: 10% The overfeed amount (OF) is determined by the following formula. OF (%) = (Surface speed of supply roller 3 or 4) -
(Surface speed of intermediate roller 7)/Surface speed of intermediate roller 7 After knitting this yarn into 14G Milano ribs, its pill resistance was evaluated based on JIS L1067-67, from grade 1 to grade 5 depending on the amount of pill generation. Evaluation was made on a five-point scale. Table 1 also shows the values of Xρ, Δn and xρ/Δn of sheath yarn 2 and the pill resistance of the obtained knitted fabric. As you can see, the crystallinity xρ is 30 to 55%,
When the degree of orientation Δn is in the range of 0.06 to 0.12 and Xρ/Δn is in the range of 350 to 650, a knitted fabric with good pill resistance can be obtained.

[Table] * Comparative Example Example 2 Polyethylene terephthalate copolymerized with 35 mol% of 5-sodium sulfoisophthalate component was heated at a speed of 4000 while blowing cooling air directly below the nozzle.
Polyester filament yarn (150 de/48 fils, xρ =
43.5%, △n=0.08) was used as the sheath yarn, and polyester false twisted crimped yarn (150 de/48 fils) obtained by a conventionally known method was used as the core yarn, and taslan was produced under the same conditions as in Example 1. It was supplied to a nozzle and wound up once as a loop yarn. Next, this loop yarn was knitted into a 14G jersey and then raised using a needle cloth raising machine to obtain a knitted fabric having uniform short fluff. The pill resistance of this knitted fabric was grade 4, and the texture was also good.

[Brief explanation of drawings]

FIG. 1 is a side view showing one embodiment of the bulky yarn manufacturing process of the present invention. 1... Sheath yarn, 2... Core yarn, 3, 4... Feed roller, 5... Taslan nozzle, 6... Loop yarn, 7... Intermediate roller, 8... Rubbing brushed body, 9... Deli Veriroller, 10...winder.

Claims (1)

[Scope of Claims] 1. A bulky textured yarn in which two or more filament yarns are mixed and entangled with a difference in yarn length, and the sheath yarn is mainly formed of loops, slack, or fluff, At least the filament constituting the sheath yarn is made of polyethylene terephthalate, which has ethylene terephthalate as a main repeating unit and is copolymerized with a compound having a -SO ₃ M group (M is an alkali metal), and is made of polyethylene terephthalate, which has the following (a) to
A bulky processed yarn characterized by satisfying (c) at the same time. (a) Crystallinity (Xρ) 30~55% (b) Orientation degree (△n) 0.06~0.12 (c) Xρ/△n 350~650