JPH03124879A - Silky yarn and its production - Google Patents

Abstract

PURPOSE:To provide the subject silky yarn consisting of a conjugated filament having a sheath-core structure composed of a sheath part consisting of two kinds of fiber-forming polymers having different solubilities and randomly laminated and a core part consisting of a poor-solubility polymer and free from strength reduction by a weight-loss processing. CONSTITUTION:Two kinds of fiber-forming polymers having different solubilities in a solvent are passed through a static kneading unit to be formed into a composite flow and spinning is carried out so that a low solubility polymer located to the core part may be covered with the above-mentioned composite flow. The resultant conjugated multi-filament yarn prepared by the above- mentioned method is then treated with a solvent to form streaks in the longitudinal direction, thus obtaining the objective silky yarn having a silky gloss and feeling. In addition, in case a fabric woven using the resultant conjugated yarn is subjected to a weight-loss processing, e.g. by a solvent, the strength of the fabric is not reduced because of the low solubility of the core part polymer. Therefor, a rigid and stiff fabric can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a silky yarn suitable for clothing and a method for producing the same. The present invention relates to a silky yarn that prevents deterioration and a method for manufacturing the same.

(Prior Art and Problems to be Solved by the Present Invention) A fabric using a laminated filament yarn made of I&li fibrous extrinsic polymer is Mi! When processed, there is a drawback that the tear strength decreases after the processing.

JP-A-63-165554 discloses a random conjugate yarn consisting of two types of fiber-forming synthetic polymers, but its drawback is that the fabric strength is reduced due to the arrangement of the two types of polymers and the weight reduction treatment. It can be said that it will decrease.

Furthermore, JP-A-61-1.16809 discloses a core-sheath composite yarn composed of three components, but the highly soluble sheath component is completely dissolved and removed after weaving and knitting. Therefore, a span-like effect could not be obtained, and the squeaky and crunchy feeling was unsatisfactory.

In response to the above-mentioned actual situation, the present invention provides a fabric knitted and woven using a composite yarn made of two types of polymers with different physical properties, which does not lose its strength even after dissolution treatment with a solvent, and which is compatible with the yarn used. The purpose of the present invention is to provide a composite yarn that satisfies the texture of VA knitted fabrics, such as silk-like luster and crispness.

(Means for solving Liil) In order to achieve the above object, the present invention includes the following configuration.

That is, it is a composite multifilament yarn made of two types of fiber-forming synthetic polymers having different solubility in solvents, and in each filament constituting the multifilament, the sheath portion is made up of the two types of polymers randomly. The silky yarn is joined in a laminated manner, the core is made of a polymer with low solubility, and has striations in the yarn axis direction.

Further, the method for producing the composite multifilament includes spinning a composite multifilament made of two types of fiber-forming synthetic polymers in 't8 fs+-. The two polymers disposed in the sheath are melted separately and formed into a composite flow through a static kneading element having 1 to 4 elements, and the composite flow is melted in the core. It is characterized by being covered with a polymer with low properties.

Hereinafter, specific aspects of the constituent elements of the present invention will be explained in further detail one by one.

In the present invention, the core refers to the center 1 of the cross section schematically shown in FIG. 1, and the sheath refers to the surrounding area 2.

The joining ratio of the sheath part and the core part can be arbitrarily selected from 1:2 to 3:21 in terms of weight ratio.

The joining ratio is determined by comprehensively considering the stability of spinning, the degree of different dyeing effect of the yarn, etc., and the ratio is preferably within the range of 2:1 from zt in terms of weight ratio.

In the sheath, two types of polymers with different solubility in solvents are joined in a random stacked-stone pattern, but the random stacked type is composed of multiple layers of 5 or less in an irregularly mixed form. It means that it is placed.

The bonding ratio of the two types of polymers in the sheath is preferably within the range of 2:l=1:2 of easily soluble polymer: hardly soluble polymer in terms of weight ratio.

The core is made of a polymer that is less soluble in the solvent that makes up the sheath.

The laminated filament yarn of the present invention must be composed of two types of fiber-forming synthetic polymers that have mutual affinity and have a dissolution rate of at least 4 times different with respect to the solvent or decomposition side.

Here, the fiber-forming synthetic polymer mainly refers to polyester and polyamide, and in order to satisfy the above requirements θ5, it may be a copolymer as long as spinnability is not affected.

Among these, polyesters include homopolyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene oxybenzoate, polydimethylcyclohexane terephthalate, boribivalolactone,
These polyester components are copolymerized with isofucric acid or sulfoisophthalic acid as a secondary acid component, or propylene glycol or polymethylene glycol is copolymerized as a secondary alcohol component. Nylon 66, nylon 610.
Nylon 11. Nylon 12. It refers to a condensate of bis(baraminocyclohexyl)methane and dodecane 2M, a copolymer of these polyamide-forming components, and a copolymer of other dicarboxylic acids and diamines.

Furthermore, in order to achieve the object of the present invention, it is required that there be a difference in solubility in a solvent between the two types of polymers in the above combination, but this generally requires In a combination of two polymers with relatively similar melting temperatures, the degree of polymerization of the polymer can be changed, the presence or absence of copolymerization or the ratio can be changed, and terminals can be used to make the polymer dyeable or difficult to dye. There are methods of appropriately selecting methods such as modifying the number of bases or introducing terminal groups that allow dyeing with dyes from different dyeing classes.

In the present invention, the difference in dissolution rate when sealing in a solvent means that there is a difference in solubility between organic and inorganic solvents, or in the case of polyester, there is a difference in resistance to chemicals such as caustic soda that acts as a hydrolyzing agent. Say something 0
Normally, the dissolution action on a solvent proceeds at a substantially constant rate until the solvent reaches a saturated state, but in the case of the present invention, in such a constant dissolution state, the dissolution rate and decomposition rate are 4 times, preferably 10 A combination of two types of polymers having a difference of more than a factor is used.

For example, combinations of polymers that satisfy the above conditions include polyethylene terephthalate, block polyether polyester obtained by copolymerizing polyethylene terephthalate with about 18% by weight of polyethylene glycol having an average molecular weight of 600 to 2,000, or polyethylene terephthalate and sulfonate. 2.5 mol% of isophthalic acid is copolymerized, and 71% of polyethylene glycol with an average molecular weight of FF of 1,600 to 2,000 is copolymerized. A combination with a block polyether polyester copolymerized in an amount of about % is preferred.

Further, 2.5 mol% of polyethylene terephthalate and sulfoisophthalic acid were copolymerized. 1 combination with soliethylene terephthalate, combination of polyethylene terephthalate and block polyether polyester made by copolymerizing polyethylene terephthalate component with 5% polyethylene glycol, copolymerization of nylon 6 and nylon 66 forming component with 10% nylon 6 component. Combinations with polyamide, combinations of polypropylene with polypropylene of different viscosities, etc. are possible.

Furthermore, in order to obtain a natural, unique color effect similar to that of natural fibers, a combination of two types of polymers with dyeing differences such as a difference in dye exhaustion rate, a difference in dyeing rate, a difference in applied dye parts, etc. may be incorporated.

By dissolving the core-sheath composite yarn with a solvent, it is possible to generate streaks in the yarn axis direction, thereby obtaining silk-like luster, JiL fit, and the like.

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

The outline of the spinning apparatus is illustrated in FIGS. 2 and 3.

Hereinafter, the spinning method will be explained with reference to the same figure. During spinning, it is necessary to satisfy at least the following two conditions.

That is, one is that the two types of polymers in the sheath part are passed through a static kneading element having 1 to 4 elements, and the other is that after passing through the kneading element, the two types of polymers in the sheath part are passed through a static kneading element having 3 or more elements, preferably 6 or more elements. The method is to spin fibers using a spinneret having a spinning hole.

The illustrated spinning apparatus fulfills these requirements.

That is, in FIG. 1, the reservoirs (7), (8), and (9) of the nozzle pack (1) are melted by separate extruders, respectively.
Two types of polymers ((7) and (8) are the sheath part,
(9) is the core polymer) Gold knit filter (10) (
10') (filtered by 10 holes (1
1) (11') (11') and its exit (12) (1
2') (12') (13) provided on the twisted distribution plate (3)
) (13'), the two types of polymer in the sheath part pass through the mixed plate (
4), passes through static kneading elements (15) (16) provided toward the lower surface, and passes through the kneading elements (15) (16).
5) (15') By (16), a randomly laminated composite state is formed using two types of polymers. This layered mixed polymer is then transferred to the outlet (17) of the kneading element.
reached and gradually spread. The single polymer core is a mixed plate (
The filament (19) of 4) is gradually spread by the flow dividing plate (5), and as shown in FIG. 3, six filaments are spun by extrusion molding.

The shape of the spinning hole varies depending on the purpose such as the texture of the outside of the yarn.
Any shape can be selected, such as a 3 to 10 multilobed shape, a flat shape, or a mixture thereof.

In addition, the two types of polymers used in the present invention have a sheath portion and a core portion as the reservoir portions into which the low-solubility polymer is introduced, respectively, as described above, instead of having separate reservoir portions.
One of the divided streams, which can be distributed from one reservoir and separated, is mixed with a polymer having a high dissolution rate and passed through a static kneading element to form a composite state. One part is melted straight, and a composite flow passes through the spinneret to spin the composite multifilament.

After the composite multifilament that has been spun by injection molding is thus spun, it is then taken up and drawn at an appropriate draw ratio.

The static kneading element used for the above-mentioned spinning is, for example, a "static mixer" manufactured by K-EX.

Toshi Engineering's "Mixing Unit".

RO3S ISG mixer, Sulzer mixing element, etc., and in some cases, special public
The multilayer device disclosed in Japanese Patent No. 23968 is also applicable. However, the appropriate number of elements is in the range of 1 to 4. If there is no kneading element at all, simply A
, 8 polymers only form a combined layer, and filaments of single polymer A or B frequently occur, which is not preferable.

On the other hand, if the number of layers is five or more, the number of divided layers becomes too large, resulting in a uniform multi-layered structure in a collapsed state, and the appropriate laminated structure intended by the present invention is lost.

Therefore, the number of InMl element elements is suitably 1 to 1, more preferably 2 or 3. Most often, one kneading element element here refers to an element that divides into 2N per stage.For example, the RO3S rsG mixing element has 4 divided layers per stage, so the mixer is considered to be 2 per stage. I do.

Furthermore, as mentioned above, the spinneret used in the present invention preferably has at least 6 spinning holes. This does not mean that it cannot be used if there are less than 5 spinning holes, or in some cases more than 3 spinning holes, but if the distance between the holes in the gold film is too large, turbulence tends to occur in the mixed flow of the multilayered polymer. In some cases, it is unsuitable, as it tends to create a spiral layer wrapped around the filament, resulting in a decrease in the iridescent appearance due to the difference in staining.

Thus, the cross section of the composite multifilament yarn spun satisfying each of the above conditions exhibits a laminated type in which the sheath part is divided into 2 to 5 layers, and a filament form in which the central part is composed of a single polymer. becomes.

The laminated filament yarn thus obtained may be subjected to false twisting or the like, or may be mixed with other filament yarns, etc., depending on the purpose.

Next, a fabric is knitted using the multifilament yarn. Although the structure of the fabric is not particularly limited, it is preferable that the multifilament yarns be located on the surface, and therefore, they may be used at least as warp yarns or front yarns.

For solvent treatment, the concentration, temperature, and bath ratio of the solvent may be set to such an extent that they do not adversely affect the strength or appearance of the fabric after dissolution. Do it to the extent that it reduces weight? eJim
If the ratio is less than 10%, the desired silk-like luster, appearance, and feel cannot be obtained when the laminated filament yarn is not divided into each component and is made into a fabric.

Since the filament yarn of the present invention has a core made of a polymer with a low dissolution rate, the filament yarn of the present invention has an alkali &! ! Even after treatment,
Decrease in tear strength can be suppressed, and fabrics using this yarn can have excellent firmness and stiffness.

The ability to develop a silk-like texture effect and a different dyeing effect is determined by randomization due to differences in the fineness and shape of filament yarns, as described in JP-A-63-165554.

6: Polyethylene terephthalate (Bride) (A) having a value of 0.64 (measured at 20°C in a mixed solvent of 4) and a cationic dye-dyeable polyester (polyethylene terephthalate fiber-forming component containing sulfoisofucle) having a value of 0.50. /122.5 mol % copolymerized polyester) Semidal (B) is introduced into the storage portions (7) and (8) shown in the second step, and a composite state is formed using a static kneading element. On the other hand, the storage part (9) has an intrinsic viscosity [η) of 0.64.
polyethylene terephthalate (ply)) (A
') is introduced, and the joining ratio (8): (B) : (A')
= 1: 1: 1, using the spinning device shown in Fig. 2, at a spinning temperature of 293°C, extrusion from a spinneret having round, Y-shaped, and flat spinning holes, and a winding speed of 1200.
m/min to obtain an undrawn yarn, and then each of the undrawn yarns was stretched under the following stretching conditions: ≠ ≠ heating speed 1000 m/min Roller/plate temperature 76/138 Spindle rotation speed 10500-8000 (50/min)
24) 9750 to 7500 (100/48) Drawn at a drawing ratio of 1.01 in the upper stage and 2.684 in the lower stage to obtain each drawn core-sheath composite multifilament of 50 denier and 24 filaments and a mixed fiber yarn of 100 denier and 48 filaments. .

For spinning, a KEX mixing element was used as a static kneading element.

Each of the drawn yarns thus obtained was knitted using a circular knitting machine, and a nonionic scouring agent of 2 g/1. Scouring was performed in a solution at 80° C. containing 2 g/l of soda ash, then centrifuged at 190° C., and alkali illumination was performed at 98° C. using a 4% pJ a O+1 aqueous solution to obtain a product with a weight loss of 30%.

Next, the fabric was preset at 170°C, dyed with a cationic dye at 120°C for 1 hour, and finished at 160°C, after which the tear strength and texture of the fabric were evaluated. In addition, threads were collected with good operability and the quality of the threads was evaluated.

The texture was measured using the KES method (developed by Professor Yohata of Kyoto University).

The results were as shown in Tables 1 and 2.

In addition, the core portion is not limited to a polymer having a low dissolution rate in a solvent, but the conventional laminated filament yarn made by spinning synthetic polymers with different solubility as disclosed in JP-A-63-165554. (The two types of synthetic polymers were the same as in the examples) were evaluated in the same manner (Comparative Examples 1 to 5).

Table 2 (Effects of the Invention) From the above, the silky yarn of the present invention has a core composed of a polymer with low solubility in solvents, so the fabric has sufficient fabric strength even after ifiming and is resistant to wind. It can be seen that the stiffness and firmness are improved even when the

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the core-sheath composite yarn of the present invention, Fig. 2 is a view of the spinneret part of the spinning device used in the present invention, and Fig. 3 is a cross-sectional view of the core-sheath composite yarn of the present invention.
- Nozzle plate plan view at x', Figures 4 and 5
Each figure is a cross-sectional view of a multifilament according to the present invention. A... Sheath part, B... Core part. (1)...Puncture of the cap, (2)...Grate. (3)...Distribution plate, (4)...Mixing plate. (5)...Flow divider plate, (6)...Spinneret. (7) (8) (9)...Reservoir. (10) (10') (10#)... Filter (
II) (II') (11...conducting holes. (12) (12') (12'')...conducting hole outlet. (13 (13') (19)...distribution plate conducting holes (14)
...Central part of the mixing board. (15) (15') (16n... Static kneading element. (17)... Kneading element outlet, (18)... Spinning hole. Figure 1 Procedural amendment (method) 1. Indication 1999 Patent Application No. 263464 2, Name of the invention: Silky yarn and its manufacturing method 3, Relationship with the case of the person making the amendment Patent applicant address: 5-17-4 Sumida, Sumida-ku, Tokyo, Figure 3 534 1-5-90 Tomobuchi-cho, Bejima-ku, Osaka Kanebo Co., Ltd. Patent Department Telephone (06) 921-1251 4. Date of amendment order January 30, 1990 (shipment date) 14; The "Brief Description of Drawings" column of the subject specification, Drawing 7, and contents of the amendment (1) ", Figures 4 and 5 show the multifilament according to the present invention in lines 19-20 of page 18 of the specification. (2) Amend "Figure 2" of the drawing as shown in the attached sheet. 8. Attached sheet of attached document list One or more copies

Claims (2)

[Claims] (1) A composite multifilament yarn made of two types of fiber-forming synthetic polymers having different solubility in solvents, and in each filament constituting the multifilament, the two types of polymers are randomly arranged in the sheath part. The core is made of a polymer with low solubility.
A silky yarn characterized by having striations in the yarn axis direction. (2) In a method for melt-spinning a composite multifilament made of two types of fiber-forming synthetic polymers, two types of fiber-forming synthetic polymers with different solubility in solvents are melted separately, and The two types of polymers arranged are formed into a composite stream through a static kneading element having 1 to 4 elements, and the composite stream is spun over the less soluble polymer disposed in the core. Characteristic silky yarn manufacturing method.