JPS6312728A - Blended fiber multifilament and its production - 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 (Field of Industrial Application) The present invention relates to a mixed multifilament yarn suitable for producing a novel spunlike knitted fabric with excellent texture, color tone, and gloss, and a method for producing the same. It is.

(Prior Art) Conventionally, knitted fabrics made of synthetic fibers have been too uniform in texture, color tone, and gloss, and it has been difficult to obtain the luxurious feel of natural a-fiber products. In order to improve these problems, a number of methods have been proposed, such as using irregularly shaped yarns, composite yarns made of multiple polymers, addition of modifiers, and mixed yarns made of different yarns. Furthermore, improvements in texture, color tone, gloss, etc. have been attempted by performing false twisting processing, alkali weight reduction processing, etc. in post-processes.

Ordinary multifilaments have poor irregularity in texture, color tone, luster, etc., and tend to be knitted fabrics with the uniformity of synthetic fibers.As a method for imparting the irregularity of natural m-fibers,
Mixed fibers, thick and thin, etc. have been proposed.

For example, mixed yarns have been proposed such as yarns with different cross-sections, yarns with different contractions, multifilaments made of polymers with different physical properties, or thick and thin yarns that have heat ζ fiber spots in the length direction of the filaments and have a shading effect. There is. However, all of these are far from the irregularity of texture, color tone, and luster that natural υ fibers have.

Japanese Patent Publication No. 48-48566 proposes synthetic fibers with irregular shapes and fineness by randomly and locally causing irregular fusion using a large number of spinning holes.
Although it has a texture, it is coarse and hard, with many yarns of high fineness, and because it has good cohesiveness, it lacks a sense of fullness and warmth, and the color tone is uniform, making it similar to natural fibers. It lacks regularity.

(Problems to be Solved by the Invention) In view of this situation ( The present invention was achieved as a result of intensive research aimed at obtaining a novel spunlike knitted fabric made of wire filaments using an industrially advantageous method.

(Means for Solving the Problems) The present invention consists of an am-type composite filament of 2 to 5 layers made of two types of fiber-forming synthetic polymers having mutual affinity and different melt viscosities; The filament is made of at least one type of filament, and the cross-sectional shape is circular or non-circular, and the fineness ratio of the circular filament and the non-circular filament is 1/2 to 1/6, and the fineness of the non-circular filament is 1/2 to 1/6. It is a cross-wire multifilament whose total sum is 50% or more of the whole.

In addition, the method of the present invention provides for mutual interaction when spinning a mixed fiber multifilament consisting of 2 to 5 layers of laminated filaments made of two types of fiber-forming synthetic polymers and filaments made of at least one of the polymers. Two types of fiber-forming synthetic polymers having compatibility and different melt viscosities are melted separately, and then both polymers are passed through a static kneading element having 1 to 4 elements and then passed through a static kneading element having a diameter of 0. .10~0
．． Patent and non-circular g2 cross-sectional shape characterized in that the yarn is partially fused after being discharged from a spinneret having a plurality of unit spinning holes in which circular spinning holes of 30 mm are arranged at the vertices of a 4- to hexagonal shape. This is a method for producing a mixed fiber multifilament made of filaments having the following properties.

In the present invention, the alii? ! Formable synthetic polymers have mutual affinity and physical properties, especially melt viscosity,
Synthetic polymers with different dyeability are desired.

Examples of fiber-forming synthetic polymers include polyester,
It refers to polyamide and polyolefin, and may be used as a copolymer to impart different physical properties. Polyesters include homopolyesters such as polyethylene phthalate, polyethylene terephthalate, polyethylene oxybenzoate, polydimethylcyclohexane terephthalate, polybiparolactone, and these polyester components).
- Examples include copolymerization of isophthalic acid and sulfoisophthalic acid as the acid component, and copolymerization of propylene glycol and polymethylene glycol as the alcohol component. In addition, polyamides include nylon 6,
Nylon 66, nylon 6101, nylon 11, nylon 12, condensates of bis(para-aminocyclohexyl)methane and dodecane diacid, copolymers of these polyamide-forming components, and copolymers of other dicarboxylic acids and diamines. Examples include things that were made.

Furthermore, examples of the polyolefin include homopolyolefins such as polyethylene and polypropylene, and those containing a small amount of a second component.

In order to use a combination of the two types of polymers among these fiber-forming synthetic polymers, firstly, they have mutual affinity and do not cause peeling due to friction during each step after spinning or during spinning. It is necessary to combine different types of polymers. For this purpose, it is preferable to consider a combination of two polymers that are of the same type and have relatively similar melting temperatures. For example, a combination of polyethylene terephthalate made by copolymerizing polyethylene terephthalene and 2.5 moles of sulfoisophthalic acid, a combination of polyethylene terephthalate and block polyether polyester made by copolymerizing 5% polyethylene glycol with the polyethylene terephthalate component, and nylon 6.
A combination of a copolyamide obtained by copolymerizing 10% of a nylon 6 component with a nylon 66 forming component, a combination of polypropylene and polypropylene of different viscosity, etc. are possible.

Among them, the combination of the first two polyesters is the most favorable in the present invention.

Furthermore, in order to achieve the object of the present invention, it is desirable that the viscosity is different, that there is a difference in heat shrinkage behavior, that there is a difference in the properties of compatible dyes, etc., but in the present invention, in particular, A difference in melt viscosity is required. for that purpose,
It is possible to appropriately select methods such as changing the polymerization degree of the polymer to change the copolymerization yield or ratio.

When the renal melt viscosity is expressed in MI@, the difference in melt viscosity between the two birch polymers constituting the mixed fiber multifilament is preferably within the range of 0.05 to 1.5 at the spinning temperature. .

When the difference in MI value is less than 0.06, the obtained mixed fiber multifilament has no circular filaments, there is little difference in fineness between filaments, and the majority of filaments are of the same shape, so there is little change in texture and gloss, making it suitable for the purpose. It is not a multifilament. On the other hand, the difference in MI value is 1.5
If it exceeds this, the discharged polymer will adhere to the surface of the spinneret, resulting in a significant decrease in spinning operability.

In addition, in order to obtain a natural different color effect similar to natural fibers in a mixed fiber multifilament, it is necessary to use two types of polymers that have differences in dyeability, such as differences in dye exhaustion rate, differences in dyeing seat, and differences in the type of dye applied. It is most preferred to incorporate a combination. For example, it can be easily obtained by using regular type polyester bright as one of the two polymers and using cationic dyeable polyester as the other polymer.

The hybrid multifilament of the present invention is constructed using the two types of fiber-forming synthetic polymers selected as described above, but a composite spinning method is usually applied for spinning, and a preferred method is shown in Figure 1. FIG. 2 shows an outline of the spinning device.

An example of the spinning method will be described below with reference to the same figure, but it is necessary to satisfy at least the following two conditions during spinning.

That is, one is to pass through a static kneading element having 1 to 4 elements, and the other is to pass through the mixing element having a diameter of 0.10 to 0.30. 4 to 6 mm circular spinning holes
This involves spinning using a spinneret having a plurality of unit spinning holes arranged at the vertices of a rectangle. The illustrated spinning apparatus fulfills these requirements. That is, in FIG. 1, polymers A and B, which are respectively melted by separate extruders and introduced into the mouth pack (1), are filtered by a wire mesh filter (3Q: ) through hole Q
4) From the exit (to) α through H' to the distribution plate (3)
The mixing plate (4
), and two types of polymers having different properties are formed into a composite state of 2 to 67 m, preferably 2 to 6 layers, by a static kneading element QP9Ql provided downward from the central part αη. Then, this layered mixed polymer reaches the exit part of the kneading element and gradually spreads concentrically, forming a second layer.
As shown in the figure, it flows out from a spinneret (5) having a plurality of unit spinning holes (5) each consisting of circular spinning holes (E) and is discharged and molded into a mixed wire multifilament.

(Thus, this injection-molded mixed wire multifilament is spun, wound, and drawn at an appropriate draw ratio after being mixed. The cross-sectional structure of the filament is 4 as shown in FIG. A unit spinning hole consisting of several holes? Components of the bonded polymers are: From ζ, for example, in the case of energized composite polyester bright and BB polymer polyester cation dyeable semidal, clearly different cross-sectional forms can be seen from the side using a WI microscope.

The present invention is characterized in that it produces mixed fiber multifilaments having different bonding states and having circular and non-circular cross-sectional shapes.

The Sv-stopping cross-wire elements used in the above-mentioned spinning include, for example, KEX's "Static Mixer", Toshi Engineering's "Mixing Unit", and RO5S 15G.
Mixing elements such as T-mixer and Sulzer Co., Ltd. may also be used, and in some cases, a multilayer device disclosed in Japanese Patent Publication No. 4B-28968 may also be used. However, the appropriate number of elements is in the range of 1 to 4. If there is no kneading element at all, the resulting layer will simply consist of both A and B polymers, and filaments of A or B homopolymers will frequently occur, which is undesirable. On the other hand, if the number of divided layers is five or more, the number of divided layers becomes too large, resulting in a uniform multilayered blended state, and an appropriate layered structure disappears. Therefore, the number of kneading elements is suitably 1 to 4, more preferably 2 or 8. However, one crosstalk element here means
An element that is divided into two layers per stage. For example, R.O.
Since the 5S IsG mixing element has four divided layers per stage, this mixer is considered to have two layers per stage.

Furthermore, as mentioned above, the spinneret with a specific arrangement used in the present invention is
It is necessary to have a plurality of unit spinning holes in which circular spinning holes with a diameter of 0.10 to 0.30 mm are arranged at the vertices of a 4 to hexagonal shape, and the maximum distance between the holes is 0.4 to 1. ．． Omm is preferred.

If the diameter of the circular spinning hole is less than 0.10 mm, the spinning hole will often become clogged, resulting in a significant decrease in operational efficiency. Moreover, when Q exceeds 30 mm, circular filaments are not obtained, and filaments with large fineness increase, and the obtained fabric becomes coarse and hard.

The number of circular spinning holes constituting a unit spinning hole is preferably 4 to 6, and it is important to arrange them at the vertices of four to six corners.

If it is not placed at the apex, it will be difficult to obtain a hollow cross-section filament, which is a feature of the present invention. If there are 8 circular spinning holes, fusion will not occur, and even if fusion occurs, the cross-sectional shape and fineness of each filament will be small and the resulting fabric will have poor characteristics. If the number of circular spinning holes exceeds 6, the difference in fineness between the circular filaments and the fused filaments will be large, and the number of flat filaments will increase, reducing operational efficiency.

The ratio of the two types of synthetic polymers constituting the mixed fiber multifilament is preferably in the range of 1:2 to 2:1. In order to have the irregular texture, color tone, and gloss that are the characteristics of the present invention, the properties of both types of synthetic polymers are necessary, and if the ratio is biased to one side, the desired characteristics cannot be obtained. In the mixed fiber multifilament according to the present invention, the ratio is substantially constant as a whole.

However, when observing the individual constituent filaments of the mixed multifilament, each filament maintains a constant ratio and cross-sectional shape in the longitudinal direction, but the bonding ratio between the filaments is It is not constant, distributed in the range from 0:10 to 10:0, and has circular and non-circular cross-sectional shapes, contains hollow cross-section filaments, and has circular and non-circular filaments! The ratio is 1/2 to 1/6, and the total fineness of the non-circular filaments is 50% or more of the total. A circular filament is a filament that is spun out from a circular spinning hole and wound up without being fused.A non-circular filament is a filament that is spun out from a circular spinning hole and wound up without being fused. This is the filament that was removed. That is, the fineness ratio of circular and non-circular filaments is determined by the number of circular spinning holes constituting a unit spinning hole. 6 unit spinning holes
When the filament is composed of circular spinning holes, the fineness ratio between circular and non-circular filaments is 1/2 to 1/6.

The mixed fiber multifilament of the present invention and its manufacturing method have been described in detail above.The multifilament of the present invention thus obtained can be knitted or woven and subjected to alkali reduction or dyeing processing in that state. ,
For example, if the A polymer is made of polyester bright and the B polymer is made of cationically dyeable polyester, when alkali weight loss is performed, unevenness can be created on the cross section of the GL fiber due to the difference in the alkali weight loss rate, and even when there is no alkali weight loss, the cross section of the filament fiber is Randomization of the exposed surface area of polyester bright and cationic dyeable polyester results in favorable conditions for different color effects due to dyeing. When dyeing multifilaments, if the dyeing properties of the two types of polymers are taken into consideration, it will be most effective in expressing irregularities such as color, tone, glossiness, unevenness, and texture. Particularly, local changes in color tone can cause iridescent color tones in textile structures.
This is an important effect of the present invention.

In the above case, it is preferable to adopt a two-color dyeing method as the dyeing method, in which the cationically dyeable polymer component is dyed in the first step, and then the polyester side is dyed with a disperse dye. For example, if the polyester side is first dyed blue and then the polyester side is dyed red, a purple-toned fabric can be obtained.

Two-color dyeing is also possible in the same bath if you select the dye.

(Effect of the invention) If the mixed fiber multifilament of the present invention is used, different fineness,
It creates new textures such as mathematical irregularities, different crimpability (shrinkage difference), and unevenness due to alkali weight loss processing, and also allows for iridescent colors through partial changes in color tone, giving it a natural texture, color tone, It becomes possible to produce spunlike knitted fabrics with excellent gloss.

(Example) Example 1 Intrinsic viscosity [η] (phenol: tetrachloroethane 6
; Measured at 20°C in a mixed solvent of 4. ) is 0.64
Polyethylene terephthalate (Bright) and 0
．． The cationic dyeing T1 dyeable polyester (polyester obtained by copolymerizing polyethylene terephthalate fiber-forming component with 2.5 mole sulfoisophthalic acid) and semidull at a joining ratio of 1:1 was mixed as shown in Fig. 1. An undrawn yarn was obtained using a spinning device having two elements at a spinning temperature of 295°C and a winding speed of 300 m/min using various spinnerets having 24 unit spinning holes shown in Table 1. Subsequently, the undrawn yarn was drawn at a drawing temperature of 85°C and a heat setting temperature of 150'C at an appropriate draw ratio to obtain a drawn mixed fiber multifilament yarn of 75 denier with a residual draw of 305J.

A 28G interlock was knitted using the obtained mixed fiber multifilament yarn and preset at 130°C.
Ka-yacryg, a black cationic dye at 120°C
BJack R-ED and yellow disperse dye Kayadon
Staining was carried out using Polyester Ye#ow 5 R for 1 hour, and final setting was performed at 160°C.

The ratio (%) of the sum of the number of hollow cross-section filaments, the number of plates of non-circular filaments, and the fineness of non-circular filaments to the total fineness of the mixed multifilament yarn obtained under each condition, and the mixed multifilament yarn. Color, texture, and color of fabric obtained from yarn The flat fabric obtained by the method of the present invention had an unprecedented spun-like texture and an iridescent color tone with natural luster, making it an excellent fabric. Among the knitted fabrics of comparative examples, Experiment No. 4 was rough and hard and did not have a span-like texture, and Experiment No. 5 had a knitted fabric with poor unevenness, low irregularity, and no characteristics. Note that the obtained mixed fiber multifilament was a laminate of 2 to 5 layers.

Example 2 In Example 1, the uA fiber-forming polymer used in Experiment No. 1, namely polyethylene terephthalate (Bright) and cationic dye-dyeable polyester (Semidal)
As can be seen from the above-mentioned tables showing the results when the bonding ratio and the number of Kenics mixing elements are changed, in the present invention, the number of kneading elements is 4 or less, and the bonding ratio of two fiber-forming polymers is Those that are not too biased to one side and do not have a majority of circular filaments have good operability, appearance,
To provide a spun-like fabric having a natural irregular feel as well as texture.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a spinneret portion of a spinning device used in the present invention, and FIG. 2 is an example of a unit spinning hole. FIG. 8 is a cross-sectional view of the mixed multifilament yarn obtained in Experiment No. 1 of Example 1, in which (a) is a circular filament, (b) is a circular filament yarn;
, (c), (d), (e) show non-circular filaments, and (e) is a hollow filament. Fig. 1 Fig. 2 Fig. 3-9 (t 21: Japanese fr material phantom L 22; Mi-gata hirame et al. 3L (a): Tomoe-gata filament〉to〕) - (e): Non-Japanese 4 filla, ( 〉)-(e): Hollow Feet 7×〉T

Claims (11)

[Claims] (1) A laminated composite filament consisting of 2 to 5 layers of two types of fiber-forming synthetic polymers having mutual affinity and different melt viscosities, and a filament consisting of at least one of the polymers, A mixed fiber mulch whose cross-sectional shape is circular or non-circular, the fineness ratio of the circular filaments to the non-circular filaments is 1/2 to 1/6, and the total fineness of the non-circular filaments is 50% or more of the whole. filament. (2) The ratio of the two types of fiber-forming synthetic polymers constituting the mixed fiber multifilament is substantially constant in the range of 1:2 to 2:1 by weight. Mixed multifilament. (3) The mixed fiber multifilament according to claim 1, wherein the two types of fiber-forming polymers are polyesters. (4) The mixed fiber multifilament according to claim 1, wherein the two types of fiber-forming polymers are polyamides. (5) The mixed fiber multifilament according to claim 1, wherein the non-circular filament comprises at least two types of irregular cross-section filaments. (6) The mixed fiber multifilament according to claim 1, wherein the non-circular filaments include at least hollow filaments. (7) When spinning a mixed fiber multifilament consisting of 2 to 5 layers of laminated filaments made of two types of fiber-forming synthetic polymers and filaments made of at least one of the polymers, there is a mutual affinity. and change the melt viscosity 2
The various fiber-forming synthetic polymers are separately melted, and then both polymers are passed through a static kneading element having 1 to 4 elements and then passed through a circular spinning hole with a diameter of 0.10 to 0.30 mm. A mixed fiber consisting of filaments having circular and non-circular cross-sectional shapes, which is discharged from a spinneret having a plurality of unit spinning holes arranged at four to hexagonal vertices and then partially fused. Method of manufacturing multifilament. (8) Two types of fiber-forming synthetic polymers melted separately,
8. The method according to claim 7, wherein the polyester is polyester. (9) The method according to claim 7, wherein the two separately melted fiber-forming synthetic polymers are polyamides. (10) The method according to claim 7, wherein the discharge ratio of the two separately melted fiber-forming synthetic polymers is substantially constant in the range of 1:2 to 2:1 by weight. (11) The method according to claim 7, which uses a spinneret having a distance between holes of 0.4 to 1.0 mm.