JPS63196732A - Composite interlaced yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is a core-sheath structured yarn with high shape robustness in which many minute loops and slacks are formed on the outer periphery of the yarn, and which has excellent knitting and weaving properties. The present invention relates to a composite interlaced yarn that has an excellent, swollen, downy hair-like touch and a soft warm feeling, and is capable of producing a woven or knitted fabric with almost no zipper phenomenon.

(Prior art) Many yarns having many loops and slacks formed on the surface of the yarn have been proposed in the past.
Publication No. 8 describes a wound part consisting of two threads having different elongations, and a wound part in which the high elongation threads are wound alternately to form an outer layer part, and a part in which the two threads are wrapped around each other. A composite wound yarn is disclosed that has alternately interlaced core portions formed by mixing and crossing, and has loops and slacks on the yarn surface. however,
Since this yarn has alternating wrapped portions and interlaced core portions in the yarn axis direction, it lacks a soft touch, swollen feeling and warm feeling compared to core-sheath structured yarn, and is also susceptible to the tension received during weaving. The wrapped portion and interlaced core portion are likely to be stretched, and there is a concern that the shape may change. Furthermore, Japanese Patent Application Laid-Open No. 59-125930 discloses that the sheath yarn is a filament having a specific highly crystalline, low orientation structure, and is mixed and intertwined with the core yarn with a difference in yarn length. Alternatively, a bulky textured yarn having a core-sheath structure formed of fluff is disclosed. However, since the filaments of the sheath yarns of this yarn have low strength and low elongation, the filaments are likely to be cut asymmetrically by the fluid agitation treatment when the fibers are mixed and entangled, and the fluid agitation treatment conditions are restricted. Therefore, it is difficult to increase the number of loops or to sufficiently improve the entanglement strength between the core and sheath yarns. Therefore, the bulky textured yarn with such a core-sheath structure is not satisfactory in terms of the number of loops, interlacing strength, etc., and the woven and knitted fabrics obtained from this yarn do not have a sufficient spun-like texture, and the tension that is applied during the weaving process is insufficient. The drawback is that the loops and entanglements come loose and the sheath threads tend to shift when squeezed.

(Problems to be Solved by the Invention) The present invention is intended to solve the above-mentioned conventional drawbacks, and its purpose is to provide high dimensional robustness of the yarn, excellent weaving and weaving properties, and to reduce the feeling of swelling. An object of the present invention is to provide a composite interlaced yarn capable of imparting an excellent texture such as a downy hair-like touch and a soft warm feeling.

(Means for Solving the Problems) That is, the third aspect of the present invention is a core-sheath structured yarn consisting of two or more thermoplastic synthetic fiber multifilament yarns, in which the filaments of the core yarn and the sheath yarn are intertwined, There are 80 or more loops per meter of yarn with a height of 0.5 m or more from the yarn surface on the outer periphery of the yarn, and among the loops with a height of 0.5 m or more, the height is 1.0 The gist of the present invention is to provide a composite interlaced yarn characterized in that the proportion of the above loops is 20% or less, and substantially no interlacing slip occurs until the core yarn stretches and breaks.

Here, the number of loops is measured using an optical fluff counter (F-INDEX TESTER manufactured by Suppinbo Co., Ltd.) in accordance with the fluff test method B defined in JIS-L-1095. That is, the number of loops having a height of 0.5 mm or more from the yarn surface is determined using the counter. Similarly, the height from the yarn surface is 1. The number of loops of On+ or more is determined, and the ratio of the number of loops of 1.0 mm or more to the number of loops of 0.5 mm or more is calculated.

Hereinafter, the number of loops per meter of yarn with a height of 0.5 or more from the yarn surface is the L index, and among the loops with a height of 0.51 or more, the number of loops with a height of 1. The ratio (%) occupied by loops of Qmm or more is called L-1 ratio.

The present invention will be explained in detail below.

First, the composite intertwined yarn of the present invention must have a core-sheath structure, and the loop strength index of the outer periphery of the yarn must be 80 or more, preferably 90 to 150. The composite interlaced yarn of the present invention has an L index of 80 or more.

The large number of loops and slacks formed on the outer periphery of the yarn can give the woven or knitted fabric a soft, warm feel with a swollen, downy hair-like touch. On the other hand, if the L index is less than 80, the above-mentioned excellent hand cannot be achieved.

Next, it is necessary that the composite interlaced yarn of the present invention has an L-1 ratio of 20% or less. Normally, a yarn with a large number of loops tends to have a large proportion of large loops that are high in height from the yarn surface, so these large loops may become entangled with each other, resulting in a high unwinding tension from the package. However, in the composite interlaced yarn of the present invention, the L-1 ratio is 20.
% or less, there are fewer thick loops with a height of 1.0 mm or more from the yarn surface. Therefore, 1,
The frequency of large loops of 0 or more coming into contact with each other and getting entangled is extremely reduced, the unwinding tension from the package is reduced, and the unwinding can be done in a stable state. Above L-
1 rate exceeds 20%, 1. The frequency of contact between loops larger than Qmm increases.

The entanglement between the loops increases, and the unwinding tension becomes excessive, resulting in a decrease in operability during mW production, and snagging and fastener phenomena are noticeable in woven or knitted fabrics, which tends to cause practical problems.

Second, in the composite interlaced yarn of the present invention, substantially no interlacing slip occurs until the core yarn stretches and breaks. That is, when the composite interlaced yarn of the present invention is stretched, the core yarn breaks first, and substantially no interlacing slip occurs until the core yarn breaks.

Here, the term "entangled slip" means that when the core yarn and sheath yarn are intertwined and a yarn with loops or slack is stretched, at least some of the entanglements of the filaments that make up the yarn come undone and slip. death.

When confounding slip occurs, loops and slack are reduced or eliminated.

The presence or absence of the entangled slip described above is determined by testing the yarn with a length of 200 fl using a self-recording fully automatic tensile tester ((t1 AI manufactured by Shimadzu Corporation).
JTOGRAPHIM-100) at an elongation speed of 50 mm/
Extend at min.

Judgment is made by drawing a stress-elongation curve as shown in Figure 1.

In other words, when the yarn is stretched, if the entanglement of the filaments that make up the yarn slips and the loops and slack decrease or disappear, the tension instantly decreases and the core yarn reaches point a where it breaks. By the time the stress elongation curve C2 in Figure 1
There is a point S where the tension suddenly decreases as shown in FIG. In such a case, it is determined that confounding slip occurs. On the other hand, when the yarn is stretched, there is no entangling slip when there is no point where the tension suddenly decreases until it reaches point a where the core yarn breaks, as shown in the stress elongation curve C1 in Figure 1. I judge that.

The composite entangled yarn of the present invention does not have a point where the tension suddenly decreases until it reaches point a where the core yarn breaks, as shown in the stress elongation curve C1 in FIG. 1, and no entangled slip occurs. be. However, as for the composite interlaced yarn of the present invention, the stress elongation opening v
There may be a portion where the yarn is stretched without substantially changing the stress, such as the portion indicated by H in AC1.

In addition, in the stress elongation curve C1 in FIG. 1 above, a curved portion C1-2 of only the sheath yarn after the core yarn breakage is recorded,
A large number of intertwined slip points S-1 appear in this curved portion. This means that the loops and entanglements formed in the filaments of the sheath yarn are maintained without disappearing until the core yarn breaks.

In the composite interlaced yarn of the present invention, it is further preferable that the filament strength of the dyed sheath yarn is 2.5 g/d or less. Normally, the strength of the filament after dyeing is directly reflected in the woven or knitted fabric, but if the strength of the filament of the sheath yarn is less than 2.5 g/d, the filament of the sheath yarn may be cut before forming a pill. It falls off and exhibits excellent anti-pilling properties.

Here, the strength of the sheath filament after dyeing is.

The sheath yarn is separated from the composite intertwined yarn and measured after being dyed in the primary manner. Incidentally, the filament of the sheath yarn may be removed from the remaining sheath yarn at the time when the core yarn is broken during the measurement of the stress-elongation curve for determining the presence or absence of entangled slip.

First, the sheath yarn was made into a general shape, placed in a 100% cotton gauze bag, dyed with the following dyeing recipe, and then centrifuged and dehydrated for 20 minutes.
Air dry for 24 hours at 65 °C and relative humidity.

For polyester fibers, as a dye.

1 g of Re5olin Blue GRL 2% oilyf, Disper T direct dispersant as an auxiliary agent, and Meisei Kagaku@Sou)
/l, using acetic acid 0.2cc/l, with a bath ratio of 1:50,
The temperature of the above bath is raised from room temperature to 130°C in 60 minutes, and dyeing is carried out at the bath temperature of 130°C for 30 minutes. Also, in the case of polyamide fibers.

As a dye, Suminol Pa5t Blue
G O, 5% owf, Levelan NDK (level dyeing agent, manufactured by Marubishi Yuka (4i)) as an auxiliary agent, 1% 0-f, acetic acid 0.2c
c/j! using a bath ratio of 1:50.

The temperature of the above bath was raised from room temperature to 100°C in 60 minutes.

Dye for 30 minutes at a bath temperature of 100°C.

FIG. 2 is a schematic side view showing an example of a composite interlaced yarn of the present invention, in which fine loops 11 with a height of 0.5 m or more and less than 1.0 m from the yarn surface are densely formed on the yarn surface. A large number of loops are formed in the state, and some large loops have a height of 1.0 mm or more from the yarn surface! 2 is formed.

Table 1 shows the results of evaluating the cord properties of composite interlaced yarns when changing the L index and L-1 ratio.

As is clear from Table 1, the L index is 80 or more.

When the composite entangled precursors 1 to 3 of the present invention satisfying the L-1 ratio of 20% or less are knitted, they exhibit excellent bulkiness, swelling feel, texture, and knitting properties, and also have no zipper phenomenon. It does not occur.

Table 1 (Sample) Core yarn is polyester multifilament yarn 75
d/36 f, the sheath yarn is a polyester multifilament yarn of 100 d/48 f, and each of the seven types of composite entangled yarns listed in Table 1 with different L indexes and L-1 ratios were used.
The fibers were knitted into a Motsukumi-rib structure using a 0-gauge circular knitting machine, and then dyed using the dyeing recipe for polyester fibers described above, and then evaluated.

(Evaluation method) (1) Bulk height (aa/g) The weight T (g/ci) and thickness W (am) of one knitted fabric were measured according to the bulk height measurement method of JIS-L-1016.
Calculate using the following formula.

Bulk height (aa/g) = T/W (2) Swelling sensation and texture Evaluation is performed in the following four stages through a sensory test.

■・・・・・・−・Very good, ○・−・・GoodΔ−・
--- Fairly poor, × --- Poor (3) Knitting property Evaluated based on the number of times the circular knitting machine stopped during knitting (7 rolls (30 m)).

■−・−・−・Less than 2 times, ○−・−・・−3 to 5 times △−
・−・−・6 to 9 times, ×−・・・・・10 or more (4
) Fastener phenomenon The knitted fabric of the above sample was cut into pieces of 10 cm in length and width.

Put the two pieces together and put 1 kg/100 c on top of it.
Apply a load of Al for 1 minute, and after removing the load, attach one end of the upper sheet to 2
When lifted at a speed of arm/second, the bottom one is the top one
The condition in which the sheet is lifted together with the sheet is evaluated as follows.

■---------Cannot be lifted.

〇－・－It lifts up slightly, but instantly separates.

Δ・−・−・・It lifts about 1/3 of the whole.

×−・−・− About 1/2 of the whole is lifted up.

Next, a method for manufacturing the composite interlaced yarn of the present invention will be described.

First, a highly oriented undrawn yarn of thermoplastic synthetic fiber is hot-stretched at a draw ratio lower than the natural draw ratio, or a yarn obtained by drawing and false twisting at a draw ratio lower than the natural draw ratio is used as a sheath yarn. . On the other hand, as a core thread.

For example, a drawn thread of thermoplastic synthetic fiber is used. The yarn to be used as the core yarn and the yarn to be used as the sheath yarn are subjected to fluid agitation treatment, but at this time, it is necessary to supply more sheath yarn than the core yarn to the fluid disturbance area. In addition, the L index is 80 or more, and the L-1 rate is 2.
In order to keep it below 0%, it is necessary to fully consider the overfeed rate to the fluid disturbance area and the number of filaments in the sheath yarn. Namely.

In order to produce the composite interlaced yarn of the present invention, it is preferable that the overfeed rate of the sheath yarn be 15% to 80% and the number of filaments of the sheath yarn be 30 or more. If the overfeed rate of the sheath yarn is too high, the L-1 rate may exceed 20%, and if the overfeed rate is too low or the number of filaments is small.

The L index may not reach 80. On the other hand, the overfeed rate of the core yarn into the fluid disturbance region is preferably 2% to 10% in order to sufficiently entangle the core yarn and the sheath yarn. If the overfeed rate of the core yarn is too high, the core yarn will become sagging, and entanglement slips will easily occur when it is subjected to tension or ironing in the subsequent weaving and weaving process. Particularly preferably, the overfeed rate of the core yarn is 4 to 8%, the overfeed rate of the sheath yarn is 20 to 50%, and the number of filaments is 36.
~96 pieces.

The total denier of the core yarn and sheath yarn is 100-300 denier, and the fluid processing pressure of the fluid disturbance nozzle is 4-9 kg/ct.
1.

In the present invention, multifilament yarns such as polyester and polyamide are preferably used as the thermoplastic synthetic fiber multifilament yarns.

As a multifilament yarn used as a sheath yarn.

Highly oriented undrawn polyester yarn with a birefringence of 20 to 80 x 10-' and highly oriented undrawn polyamide yarn with a birefringence of 30 to 45 x 10-' are particularly preferably used. On the other hand, as a core thread.

Filament yarns with high birefringence, such as ordinary drawn filament yarns, are preferably used.

Next, a method for manufacturing a composite interlaced yarn according to the present invention will be explained based on illustrated examples. FIG. 3 is a schematic process diagram showing an example of manufacturing the composite interlaced yarn of the present invention.

In the figure, the highly oriented undrawn yarn A pulled out from the spool 1 is stretched between the feed roller 2 and the first delivery roller 5 via the feed roller 2, and is heated by the false twist spindle 4 while being heated by the heater. 3, and is supplied to the fluid injection nozzle 8 via the first delivery roller 5 at a predetermined overfeed rate. On the other hand, the drawn yarn B drawn out from the pirn 6 passes through the feed roller 7 and is delivered to the fluid jet nozzle 8 at a predetermined overfeed rate.
The undrawn yarn A is supplied to the wafer, is aligned with the false twisted yarn of the highly oriented undrawn yarn A, subjected to fluid agitation treatment, and then passed through the second delivery roller 9 and wound up into a package 11 by a winding roller 10.

As the above-mentioned fluid injection nozzle, 1 is used, for example, Japanese Patent Publication No. 34-89
The Taslan nozzle described in Japanese Patent Publication No. 69, Japanese Patent Publication No. 35-1673, etc. is used.

(Function) In general, for yarns made of two or more multifilament yarns intertwined and having loops on five surfaces, the spun-like feel improves as the number of loops increases; This has the trade-off that the weaving tension increases and the weaving properties and product quality deteriorate. However.

Since the composite interlaced yarn of the present invention has the loop height and number of loops on the yarn surface within a specific range, it can simultaneously satisfy conflicting performances such as texture and handleability.

Composite interlaced yarn with conventional loops and slack.

As shown in stress elongation curve C2 in FIG. 1, interlacing slip occurs. Therefore, fast and complicated made &
Unable to withstand the harsh tension of the W weaving process.

Before breaking, the entanglement decreases or disappears, the loops decrease, and the yarn form is likely to change.In contrast, the composite interlaced yarn of the present invention does not cause entanglement slip and has high morphological robustness. Even if a large number of loops are formed on the yarn surface, it can be made &! It can easily pass through weaving processes, can withstand high-speed weaving and weaving processes, and can handle complex woven and knitted fabric designs.

Moreover, since the composite interlaced yarn of the present invention has an L index of 80 or more and an L-1 ratio of 20% or less, a large number of fine loops are present, and the Wii product has a swollen feeling. It can give excellent textures such as downy hair-like touch and soft warm feel.

(Example) Next, the method of the present invention will be specifically explained using examples.

In addition, the pilling evaluation in the examples was based on JIS-L-10.
It was measured in accordance with 76.

Example 1 According to the process shown in FIG. 3, a highly oriented undrawn polyethylene terephthalate yarn 110d/36f with a birefringence Δn of 50×10−′ was used as the highly oriented undrawn yarn A, and a polyethylene terephthalate drawn yarn (with a birefringence Δn is 1
The composite interlaced yarn of the present invention was produced using the following conditions:

Table 2 The obtained composite interlaced yarn has a core in which the false twisted polyethylene terephthalate highly oriented undrawn yarn forms numerous loops and slacks to constitute the sheath yarn, and the polyethylene terephthalate drawn yarn constitutes the core yarn. It was a composite interlaced yarn with a sheath structure.

This composite interlaced yarn has an L index of 142. L-1 rate is 13
%Met. Further, the stress-elongation curve of this composite interlaced yarn was a curve like C1 in FIG. 1, and no interlacing slip occurred up to the breaking point of the core yarn.

This composite interlaced yarn was placed on the front side, and the polyethylene terephthalate false twisted yarn 150d/30f was placed on the back side.

When knitted into a circular reversible structure, the two-knitting properties were good. Next, it was dyed and finished according to the dyeing recipe for the polyester fiber.

The surface of the knitted fabric has finely protruding loops, giving it a warm feel similar to that of downy hair and a flexible bulging sensation.It also has excellent tension and elasticity, and has a grade 5 pilling rating, making it a knit with good anti-pilling properties. The land was obtained. Furthermore, the breaking strength of the sheath yarn of the composite interlaced yarn which was unknitted from the knitted fabric after dyeing and finishing was 1.95 g/d.

(Effects of the Invention) The composite interlaced yarn of the present invention is a core-sheath structured yarn in which a large number of fine loops are formed as described above, and is characterized in that interlacing slip does not occur under elongation stress. Therefore, (1) when the composite interlaced yarn of the present invention is used in woven or knitted fabrics, it has excellent unwinding properties and has high shape robustness against tension and ironing, so it can sufficiently withstand high-speed knitting and weaving processes; Quality stability can be achieved. Furthermore, a woven or knitted fabric can be obtained which has a downy hair-like touch on two surfaces, has a high sense of swelling, and is unlikely to cause the zipper phenomenon.

[Brief explanation of the drawing]

FIG. 1 is a stress elongation curve of the yarn, FIG. 2 is a schematic side view showing an example of the composite interlaced yarn of the present invention, and FIG. 3 is a process schematic diagram showing an example of the manufacturing process of the composite interlaced yarn of the present invention. . In the figure, CI is the stress elongation curve of the composite interlaced yarn of the present invention, C2
is the stress elongation curve of a conventional composite intertwined yarn, β1 is a fine loop, 12 is a large loop, 1 is a spool, 2 is a feed roller, 3 is a heater, 4 is a false twist spindle, 5 is a first delivery roller, 6 is a pirn , 7 is a feed roller, and 8 is a fluid jet nozzle. 9 is a second delivery roller, 10 is a take-up roller, and 11 is a package.

Claims (1)

[Claims] (1) A core-sheath structured yarn consisting of two or more thermoplastic synthetic fiber multifilament yarns, in which the filaments of the core yarn and sheath yarn are intertwined with each other, and the height from the yarn surface to the outer periphery of the yarn is 0. There are 80 or more loops of .5 mm or more per meter of yarn, and the proportion of loops with a height of 1.0 mm or more of the above-mentioned loops of 0.5 mm or more is 20% or less, and the core yarn is A composite interlaced yarn characterized in that substantially no interlacing slip occurs until it is stretched and broken.