JPS6031924B2 - Island-in-the-sea multifilament - Google Patents

Description

[Detailed description of the invention] The present invention relates to a sea-island multifilament.

More specifically, the present invention relates to an island-in-the-sea type multifilament having a torque restoring force suitable for producing grain. Conventionally, it is known that sea-island type fibers are made into felt as short fibers, and then B is eluted and removed to create a fabric with a pseudo-leather look. It has been almost impossible to directly produce woven or knitted fabrics for general clothing use as sea-island type fibers. The reason for this is that when sea-island fibers are processed into products by removing B after bran weaving, a soft knitted fabric that takes advantage of the characteristics of the ultra-fine single fibers of A can usually be produced, but in general, the luster of the product becomes glaring. The twill resistance against bending and folding is extremely poor, there is no wrinkle resistance, the dyeability is poor and the desired color cannot be obtained, and in the case of textiles, it is easy to cause misalignment of the warp and warp yarns called weft. This is due to this.

As an example of use as a filament,
No. 36 is known, which has a sharp green color in each filament after sea component elution, and in such fibers, the difference between the coefficient of static friction and the coefficient of kinetic friction between fibers becomes large. When knitted fabrics are used, recovery after deformation is not smooth, which tends to cause tissue misalignment known as "laughing," and woven fabrics tend to recover easily from distortion in the bias direction, resulting in poor drapability and resilience. Fabrics with excellent quality are difficult to obtain.

Furthermore, in woven and knitted fabrics using island-in-the-sea type fibers, the luster tends to increase as the fineness of the single fibers of the island component becomes finer, and having a sharp green color further promotes this, resulting in excessive luster. and was unable to produce a mild, subdued shine.

Furthermore, with synthetic multifilament fibers, it is difficult to prevent warping while retaining torque restoring force and to develop good grain, so that it has not been possible to obtain a sufficiently grained fabric.

The present invention solves these drawbacks by creating a woven fabric that has excellent drapeability, anti-twilling properties, wrinkle resistance, and gloss, has dyeability comparable to conventional synthetic fiber products, and has a torque restoring force suitable for creating grain. This invention provides an island-in-the-sea multifilament for knitting.

Its composition is as follows. That is, it is a multifilament made of a plurality of sea-island type fibers, which has a potential torque restoring force due to heating, but is held in place by the fusion of sea components. The sea component B has a different solubility, and the difference in melting point between the island component A and the sea component B is 12 points or more (melting point of A>melting point of B), and the weight ratio of the island component A to the whole is 65 to 65. 92%, the number of single yarns (number of island fibers) of island component A is 3 to 10, and the average denier of each single yarn of island component A after stretching is 0.5 to 10.
0. A sea-island type multifilament which is an insect and is characterized by containing two or more types of island component A having different degrees of deformation in each single filament. The sea-island type multifilament according to the present invention has a cross-sectional structure as roughly shown in FIG.

Generally, the encased component is called island component A, and the encased component is called sea component B. Although some portions of A present on the outer periphery of the composite single yarn are not completely wrapped, there is no problem in actual use. The yarn can be manufactured by the following method. That is, component A may be any thermoplastic polymer suitable as a clothing fiber, such as polyethylene terephthalate, nylon 6, nylon 60 polypropylene, etc. Component B is polystyrene or a copolymer thereof, which has a melting point of 12% higher than that of component A.
000 or more thermoplastic polymers are suitable. The chips of component A and component B were individually softened on a hot plate, and
The composite yarn is introduced into a composite thread as shown in FIG. 1, and is formed into a composite yarn as shown in FIG.

FIG. 3 is a sectional view of a die for hemming the fibers of the present invention. A
The component and the B component are separated by a barrier 5 and introduced into the composite yarn forming section. The A component is separated by a plate 2 with pipes 6 and introduced into a plate 3 with protrusions 7 that control the flow rate of the B component. The tip 8 of the pipe 6 is usually circular. The B component is formed around the A component at the composite yarn discharge hole 10, and a plurality of composite yarns in this state are guided to the gathering plate 4 having the gathering section 9 and are combined. The liquid is continuously discharged from the final discharge hole 11.
This composite yarn is passed through a cooling tube, wound at a speed of 700 to 3000 m/min to form an undrawn yarn, and then heated with a hot pin or hot roll (temperature 80 to 120 C○) to obtain a 2.5 to 4.0
The target drawn yarn can be drawn by stretching the yarn at a double speed. According to the inventors' study, the A component is nylon 6, nylon 6
0 Polyethylene terephthalate, and as the B component, polystyrene was the most preferred. Component B is generally eluted and removed after the yarn is woven, and the processing cost is low, the thread passes easily through the weaving and bran processes, and it is easy to obtain a yarn with a good texture.

The removal of these eight components after bran weaving corresponds to the removal of sericin during the kneading process in silk products, resulting in products that are soft, resilient, and have a good texture. Here, the weight ratio of component B has an appropriate value.

That is, the yarn is manufactured using a composite die as shown in FIG. 3, but when the B component is large, composite paper yarn can be produced very easily. Ru. However, when the weight ratio of the eight components becomes 7% or less, the A components adhere to each other as shown in Figure 2.
Thick single filaments called merged filaments are generated, and the desired multifilament made of ultra-fine single filaments cannot be obtained. On the other hand, if B is less than 8% when B is eluted and removed, the voids between the single yarns of A will be insufficient and the friction between the single yarns of A will increase in the final woven or knitted fabric, resulting in poor drapability and resilience. It is not possible to obtain a well-balanced product, but on the other hand, if B is 35
If it exceeds %, the voids between single yarns become too large and the product loses its elasticity, which is undesirable as it tends to cause a misalignment of the structure called mesh misalignment in the fabric.

From the above points, the weight ratio of B is preferably 8 to 35%, that is, the weight ratio of A to the whole is preferably 65 to 92%, and more preferably 75 to 90%. Furthermore, the thickness (denier) of each single yarn of A has an appropriate value.

As shown in Samurai Kosho 44-118369, if the above-mentioned compound thread cap is used, the thickness of each single thread A is 0.0 for the thinner one.
01 denier, and the thicker one can be up to several tens of deniers. However, when the single yarn is 1.0 denier or more, the texture is not much different from that of a product made from yarn obtained by ordinary spinning methods, and it has the mild luster, soft surface touch, and supple drape properties that are the objectives of the present invention. You cannot get a product with . Figure 4 shows Dianix
0.5 using female vyBlueER-FS (Mitsubishi Chemical)
%o. w. f and 1.0% o. w. This is the total reflectance measured using a spectrophotometer at a wavelength of 610 millimicrons for the dyed under the conditions of f.

As shown in Figure 4, when the single yarn denier of A becomes thinner than 0.6 denier, the reflectance of the dyed product increases significantly, that is, the color appears pale, which is required for clothing such as black and dark blue. It becomes impossible to develop dark colors. This lightening of the color is essentially due to a reduction in the dyeing rate of the fiber due to an excessively thin single yarn denier. From the above points, the single yarn denier of A is preferably in the range of 0.5 to 0.9 denier. Furthermore, the number of single fibers of A present in sea component B, that is, the number of islands of A, also has an appropriate range.

That is, if the number of A is increased to medium or large, it becomes necessary to extremely reduce the number of filaments as a multifilament composite yarn from the range of the above-mentioned appropriate single filament denier.

In this case, the rigidity of the multifilament becomes too high, and when it is made into a woven or knitted fabric, the yarn becomes difficult to twist, and it becomes difficult to produce a fabric with a high weaving or knitting density, which is undesirable. Also, when winding up the burn, it tends to lose its shape. On the other hand, if the number of island filaments is too small, the single filaments of the multifilament will become too thin, causing single filament breakage during alignment or rewinding, and single filament breakage of the drawn yarn. Too many, which is not desirable. The appropriate number of islands varies depending on the total denier of the multifilament, but is 3 to 10, and within this range, the above-mentioned appropriate denier is 0.
．． By maintaining a denier of 5 to 0.9, it is easy to handle without yarn breakage, and a multifilament can be constructed.
It is more effective to apply a relatively small number of islands to a product with a small total denier, and a relatively large number of islands to a product with a large total denier. In addition, in knitted fabrics, especially woven fabrics, there are cases in which a welt of more than 100 yarns is added to the raw yarn during weaving, and later the torque restoring force due to this weave is used to create a grained fabric.

In the case of silk, sericin, which is the sea component of the thread, is swollen with water, processed and dried to temporarily eliminate the torque and stop the writhing before weaving, and then the sericin is eluted and removed in the kneading process. However, good textured fabrics are manufactured by utilizing the torque restoring force of fibroin, which is an island component.
However, with synthetic fiber multifilaments, it is theoretically difficult to stop the fraying with heat while retaining the torque restoring force, and if enough heat is applied to stop the fraying, the torque restoring force will inevitably decrease. As a result, sufficient grain formation cannot be obtained. The inventors solved this problem by increasing the melting point difference between A and B in the yarn, using the same principle as silk fabric, that is, fusion of the sea component while retaining the torque restoring force of the island component. They discovered that by temporarily stopping the writhing, they could create a good grained fabric.

That is, if the melting point of B is 120° C. or more lower than that of A, it is possible to perform the anti-wrinkle processing without reducing the torque restoring force of A. Furthermore, when making a composite yarn using a composite die as shown in Figure 3, that is, by pouring an island component into a sea component, especially when the weight ratio of A exceeds 60%, each unit of A It has been found that even if the tip 8 of the pipe is circular, the cross-sectional shape of the thread can be a mixture of various shapes such as an ellipse, a triangle with rounded corners, and a trapezoid with rounded corners. To obtain this mixed state, it is necessary to comprehensively adjust the discharge ratio of Shimakai, the relative relationship between the melt viscosities of A and B, the diameter of the final discharge hole 11, and the thread take-up speed. Even if the discharge ratio of the island component is unnecessarily increased while the balance remains unbalanced, an abnormal yarn called a merged yarn as shown in FIG. 2 will only be created. It goes without saying that the mixture of two or more types of cross-sectional shapes changes the bulkiness, tactile sensation, and gloss of the product, and is necessary to obtain a good product.

The degree of change in cross-sectional shape is referred to as the degree of deformation, and was measured as follows. Degree of deformation=diameter of circumscribed circle/diameter of inscribed circle In this thread, a cross section with an acute angle or a star shape will never occur.

However, it is possible to partially include yarns with a deformation degree of about 1.5, and if the deformation degree of each individual yarn is measured and the difference is 0.2 or more, it is possible to determine the texture and ribbing. It was recognized that there was a good effect on the actual performance. As described above, the sea-island composite multifilament according to the present invention is widely used in general clothing applications, especially women's clothing, shirts, blouses, and Japanese clothing that require drapability, anti-sacrificial properties, gloss, etc.
This is suitable, and it is possible to obtain a novel product that has never existed before.

The present invention will be further explained below with reference to Examples.

In the embodiments of the present invention, the degree of firmness refers to the number of twists of a double twist that hangs a load of 0.01/d on the center of a 100-strand sample length and twists both ends together. The value obtained by measuring the value and substituting the measured value into the formula below. In the formula, D is the total weave of the yarn to be measured, where the stiffness = x.

Example 1 Polyethylene terephthalate (
2500 orthochlorophenol with an intrinsic viscosity of 0.66 and a melting point of 265 qo), and polystyrene (manufactured by Asahi Dow Co., Ltd., trade name Styron, melting point 9) as a sea component.
800) at a paper yarn temperature of 290°C and a winding speed of 900/
Using the die shown in FIG. 3 (6 islands, 18 holes), a sea-island type composite system was prepared in which the total denier of the island components was 240 deniers and the weight ratio to the whole island was 80%.

．． Furthermore, when these undrawn yarns were drawn at a pin temperature of 11 mm, a hot plate temperature of 150 mm, a magnification of 3.2 times, and a speed of 350 mm/min, they were all drawn without any problems, and the sea component alone was 75 denier. I got the original yarn.

Using this thread, Madara 4 no Tsukasa/Kite no yori was added to a hot plate at 100 qC for 0.7 seconds.

This thread was tied with polystyrene, and its stiffness was 1292. This thread was immersed in trichloride (room temperature) for 30 minutes, and its stiffness was then measured to be 6151, indicating that the temporarily fixed torque had been restored. On the other hand, the above-mentioned 3,440 times/desk weaving thread that has been knitted is used as the horizontal thread, and polyethylene terephthalate yarn with a weave of 50 denier is used as the warp thread to create a woven fabric (weave: plain fiber, density: 120 threads/inch). , 85 pieces of chocolate/inch) were made, and after relaxing with 9800 boiling water, they were placed in an oven at 160°C without tension.

This fabric was made of fused styrene and was in the form of a hard film. Thereafter, it was immersed in 30q0 perchlorethylene (trade name: Perchloren) to sufficiently remove the styrene. After air-drying these samples, fabrics made of regular polyester yarn (75 denier 36 filaments)
Tissue: Plain fiber Density: 120 vertical fibers/inch, chocolate disaster book/
Drapability and anti-rolling properties were compared by sensory test using a corresponding sample (18% of the total weight in inches was reduced by hydrolysis by alkali treatment). The results are shown in Table 1. Moreover, the grains of the obtained grained fabric had a very luxurious texture.

Table 1 Comparative Example Polyethylene terephthalate used as island component in Example 1 Nylon 6 as sea component 23
5 qo) was used to draw the grade yarn according to the method of Example 1.

The obtained yarn had an island component weight ratio of 80%, and a total denier of only the island components was 75 deniers. 10 pieces of this thread
0℃, 120qo, 16 pi○ hot plate. While in contact for 10,000 seconds, a force of 3,440 times/m was applied. These yarns were all yarns with no loose ends, and their respective degrees of frizz were 3211 and 30002631. The degree of flatness that does not cause problems in normal weaving is said to be 2000 or less, and none of them could be woven.

[Brief explanation of drawings]

FIG. 1 is an example of a cross-sectional view of a multifilament according to the present invention. FIG. 2 is a cross-sectional view of an abnormal thread that is merging. Figure 3
is a cross-sectional view of a spinneret for spinning the yarn. FIG. 4 is a diagram showing the relationship between the single yarn grade and the reflectance when the product is dyed. Substitute 1 Bait 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 It is a multifilament consisting of a plurality of sea-island type fibers, which has a potential torque restoring force when heated, but is prevented from twisting by the fusion of the sea component. It consists of a different sea component B,
The difference in melting point between island component A and sea component B is 120°C or more (melting point of A>melting point of B), the weight ratio of island component A to the whole is 65 to 92%, and the number of single yarns of island component A ( The number of island fibers) is 3 to 10, the average denier of each single yarn of island component A after drawing is 0.5 to 0.9 d, and each single yarn of island component A has a different degree of deformation. A sea-island type multifilament characterized by containing two or more types.