KR920009434B1 - A spinning nozzle for synthetic mixed-shaped fiber - Google Patents

Abstract

Spinneret for co-spinning synthetic fiber mixed-shape filament features arranging a circular or triangular orifice, and at least two kinds in shape of orifices of Y-shape and T-shape composed of 3 component slits in circumferential or lattice pattern in the same spinneret in a way of satisfying the following equations of c(%) = s/s+t x 100 <= 40 [c = occupying rate of a circular orifice in same spinneret; s = no. of circular orifices in same spinneret; t = no. of irregular orifices in same spinneret 0.5 <= Q2/Q1 <= 3.0, 0.5 <= Q3/Q1 <= 3.0, and 0.5<= Q3/Q2 <= 1.5 [Q1= extruding amount of a circular orifice in same spinneret; Q2= extruding amount of one kind of irregular orifices in same spinneret; Q3= extruding amount of the other kind of irregular orifices in same spinneret . The filament made by this unique spinneret features even lustre and elegant silk-like lustre while eliminating luster-stains in band form.

Description

Spinnery for Synthetic Fiber Blended Yarn

1 is a cross-sectional view illustrating a discharge hole of a conventional spinneret for release cross section.

2 is a cross-sectional view of the fiber for explaining the shape deformation ratio of the release cross-section yarn.

3 is a cross-sectional view of the spinneret showing Example 1 of the present invention in which the circular spinneret, the Y-shaped spinneret (FIG. 1B) and the T-shaped spinneret (FIG. 1C) are circumferentially arranged in the same spinneret.

4 is a cross-sectional view of the spinneret showing the third embodiment of the present invention in which the circular spinneret, the Y-shaped spinneret (FIG. 1b) and the Y-type spinneret (FIG. 1e) are arranged in a lattice shape on the same spinneret.

The present invention relates to a spinneret for producing a synthetic fiber mixed yarn having excellent gloss uniformity and no gloss band on a band and having an elegant gloss like a natural dog. That is, at least two or more types of hetero-section spinnerets of triangular or three-slit Y-shaped and T-shaped spinnerets are arranged in the same spinneret at an appropriate ratio and co-spun from a thermoplastic resin capable of melt spinning (Co-spinning) relates to a spinneret for producing a synthetic fiber mixed yarn, characterized in that for. Herein, the blended yarn refers to a filament yarn obtained by cospinning using a spinneret in which at least two or more types of circular yarns and shaped cross-section spinnerets are mixed in the same spinneret.

In general, the prior art relating to the method for producing a release cross-section yarn, as described in the literature, such as Japanese Patent Application No. 36-20770, 37-5268, 45-19402, 46-36247, and British Patent No. 12618262, US Patent No. 3,34,993. Although several methods have been proposed, they are arranged in the same radiation mold, and only one type of radial cross-section holes are arranged, so that the resulting single-sided yarn is less uniform in gloss when woven into a fabric, and in severe cases, It was insufficient to meet the object of the present invention because it would form a band-like glossiness on the phase. Moreover, such a phenomenon occurs mainly in the case of thin fabrics, so there is a defect that causes huge economic losses.

In order to increase the gloss uniformity of the woven fabric by using a sectional filament yarn made of spinnerets made of one-sided spun yarns of one type, the shape deformation ratio, which is one of the factors that define the characteristics of the sectional filament yarn, Uniformize the ratio of shape deformation. In other words, the shape deformation ratio should be adjusted within arbitrary limits when manufacturing the cross section filament yarn, which is very cumbersome, unreasonable and uneconomical in quality control in a large scale production system.

In addition, the shape deformation ratio of the release cross-section filament yarn is slightly different depending on the release cross-section yarn determined by the shape of the spinneret. For example, the cross section of a release cross-section filament yarn manufactured from a Y-shaped spin hole (FIG. 1B) is defined as follows in FIG.

In the above formula, r is the radius of the inscribed circle of the concave joint of the deformed cross-section filament yarn, and R is the radius of the circumscribed circle of the convex joint.

However, the shape deformation ratio varies depending on the spinning conditions, that is, the spinning temperature, the temperature of the cooling air, the speed of the cooling air, the molecular weight of the polymer, and the like, and in a large production system, it is actually very difficult to control the shape deformation ratio within an arbitrary limit. The reason is that in order to obtain a uniform shape ratio, a temperature control device is required to provide a temperature distribution by separately separating the liquid region and the liquid-solid region under the spinneret which almost determines the shape strain ratio of the cross-sectional fiber. to be.

In order to give a temperature distribution by dividing the liquid area and liquid-solid area separately from the spinneret under the spinneret, a huge amount of energy is required because the radiation hole surface and the radiation container are left in the air, and thus a direct cause of cost increase. There was this.

In order to achieve the above-mentioned problems, Korean Patent Laid-Open Publication No. 89-12026, which is a prior application of the applicant of the present invention, arranges circular orifices and three or three types of radial cross-section spinnerets of the same type in the same radiation mold. Although a method of manufacturing a mixed yarn using one spinneret is described, although uniformity of gloss is improved, a satisfactory effect cannot be obtained, and a gloss plaque is about 0.5 to 1.6%, and spinnerets are manufactured only in a lattice shape. There had to be a constraint on the manufacture of spinnerets.

Therefore, the object of the present invention is to achieve excellent gloss uniformity and excellent gloss uniformity of the woven fabric as a synthetic fiber blended yarn, and it is possible to control the gloss spot generation rate perfectly with 0.3% or less of the gloss band on the band. It is to provide a spinneret for producing a synthetic fiber blend yarn to have an elegant luster like a dog.

The spinneret used in the present invention is a synthetic fiber blend by co-spinning a circular spinneret and at least two or more types of hetero-section spinnerets by co-spinning a spinneret arranged in a lattice or columnar shape in the same reflective mold at a ratio of suitable conditions. The manufacture of the detective completely solved the defects of gloss non-uniformity and band-like glossiness, which are the drawbacks of the sectional yarn manufactured through the spinneret composed of the above-mentioned circular yarn and one type of sectional yarn.

In order to explain the present invention in detail, at least two or more types of hetero-section radioactive holes in a circular radiator and a hetero-section radiating hole, that is, triangles or three-slit Y-type and T-shaped radiating holes are formed as shown in FIG. The ratio C occupied by the circular radiator in the case of being arranged in a columnar shape and in a lattice shape as in FIG. 4 is defined as follows.

Here, s is the number of circular radiation holes in the same spinneret, and t is the total number of hetero sectional spinnerets in the same spinneret consisting of two or more types of heterospun cross-section spinnerets among the heterospun cross-section spinnerets.

According to the present invention, a circular radiator is formed in a circular radiation hole in which at least two or more types of hetero sectional radiation holes, such as a circular triangular hole and a hetero sectional radiant hole, that is, an equilateral triangle, a Y-type and a T-type consisting of three throats, are arranged in a columnar or lattice shape. Synthetic fiber blended yarn is produced by arranging the circular cross-section fibers to be evenly distributed between the hetero-section fibers with a proportion (C) of 40% or less.

Therefore, it is impossible to achieve a band-like gloss band, which is a defect of the release cross-section filament yarn, and a plane mirror, which is the cause of the metallic luster, produced through the spinneret composed of only one type of cross-section yarn, and the shape deformation ratio of the release cross-section filament yarn is not uniform. Even if it is not, it is possible to solve the gloss nonuniformity caused by the non-uniformity of the shape deformation ratio by the difference in the degree of light dispersion between the circular cross-section filament yarns of the non-woven cross-section filament yarns, and there is no band-like glossiness at all. It is possible to obtain a synthetic fiber mixed yarn having a.

FIG. 3 is a cross-sectional view of a spinneret in which circularly-shaped spinnerets and circularly-shaped cross-section spinnerets and T-shaped spinnerets (FIG. 1c) and y-shaped spinnerets (FIG. 1b) are circumferentially arranged and arranged in the same spinneret. Fig. 1 is a cross-sectional view of the spinneret in which a circular spinning hole, a y-shaped spinning hole (FIG. 1E) and a Y-shaped spinning hole (FIG. 1B) are mixed and arranged in a lattice shape.

If the ratio C of the circular radiator is equal to or greater than 40% in the same spinneret in which at least two or more heterogeneous cross-section spinnerets are arranged at an appropriate ratio, the gloss uniformity of the synthetic fiber mixed yarn is excellent, and the band-like gloss band Although the incidence rate is low, the gloss like a natural dog for the purpose of manufacturing a modified cross section filament yarn cannot be obtained due to the large amount of circular cross section filament yarn.

At least two kinds of circular yarns and heterosection yarns are arranged in lattice and circumference in the same spinneret at an appropriate ratio, and co-spun to produce synthetic fiber hybrid yarns, as well as the denier difference between circular section filament yarn and hetero section filament yarn. In addition, the denier difference of the cross section filament yarn is also important.

If the denier range of the circular cross section filament yarn and the cross section cross filament yarn is not determined, non-emission and trimming may occur frequently during spinning and drawing, and spinning and stretching operations cannot be performed. In order to determine this range, it is necessary to design the size of each spinneret within the proper range when designing spinnerets.

First, if the discharge amount of the circular radiator in the spinneret in which at least two or more of the circular radiator and the shaped cross-section spinneret are arranged at an appropriate ratio is Q1, Q1 is as follows.

Where r is the radius of the circular radiator, ΔP1 is the pressure difference, ι is the melt viscosity of the polymer, and silver is the length of the circular radiator. Further, assuming that the discharge amounts of the two types of cross-section spinnerets are Q2 and Q3, Q2 and Q3 are as follows.

In the above formula, A is the cross-sectional area of the radial cross-section spine, ΔP is the pressure difference, L is the length of the cross-sectional spine hole, λ is the Shape factor, P is the length of the circumference of the hetero-cross spine hole.

Regarding the shape factor according to the shape of the throat constituting the deformed cross-section spinning hole, Industrial Engineering Chemical Fundamental Vo1. 11, No. 4, 1972.

At least two or more types of hetero-section spinnerets are supplied to the spinnerets arranged in a lattice or circumferential shape at an appropriate ratio, so that thermoplastic resins having the same melt viscosity are supplied through the circular radiators and hetero-sector spinnerets. The melt viscosity of the flowing thermoplastic resin is the same at the same shear rate.

Therefore, in order to equalize the pressure difference ΔP1 of the circular radiating hole and the pressure differences ΔP2, ΔP3 of the unshaped cross-section spin hole, the radius r and the length of the circular radiating hole are changed, and the lengths of the non-cross-section radiating hole (L2, L3). ) And the cross sectional area (A2, A3) and the periphery length (P2, P3), etc., so that the ratio Q2 / Q1 of the discharge amount Q2 to the discharge amount Q1 and the ratio Q3 / Q1 of the discharge amount Q3 to Q1 should be 0.5 to 0.3. The discharge rate ratio Q3 / Q2 between the radial cross-section holes shall be 0.7 to 1.5.

If the pressure difference △ P1 of the circular radiator and the pressure difference △ P2, △ P3 of the cross-section radiator are different, the degree of orientation of the fiber may be affected by the influence of the speed difference. have.

In addition, when the difference between ΔP1, ΔP2, and ΔP3 is severe, there may be an extreme case in which the polymer does not flow to the throat end constituting the release cross-section spin hole.

When Q2 / Q1 and Q3 / Q1 are less than 0.5 but 3.0 or more, and Q3 / Q2 is less than 0.7 but 1.5 or more, spinning and softening work due to frequent trimming during spinning or stretching due to the severe difference between denier of circular section filament yarn and heterosection filament Very poor sex. More preferable ranges of Q2 / Q1 and Q3 / Q2 are 0.7 to 2.3 and 0.9 to 1.3, respectively.

Resins useful in the present invention are generally thermoplastic resins capable of melt spinning, for example polyesters and copolymers thereof, polyamides (Nylon 6, Nylon 66) and copolymers thereof, polypropylene and copolymers thereof, and the like.

Hereinafter, the present invention will be described in detail with reference to Examples.

[Examples 1-3]

가 6.20×104인 폴리에틸렌 테레프탈레이트(polyethylene terephthalate) 중합체를 280∼290℃의 온도로 용융압출하고 원형방사공과 이형단면 방사공 37개를 표 1과 같은 조건으로 제3도 및 제4도와 같이 각각 원주상 및 격자상으로 배열한 방사구금을 통하여 매분당 34.2kg으로 토출하여 방사속도 1260m/min으로 권취하고, 연신속도 1200m/min, 연신비 3.254로 연신하여 75데니어 연신혼형사를 얻었다.Weight average molecular weight prepared by a conventional method

Melt-extruded polyethylene terephthalate polymer having a value of 6.20 × 104 at a temperature of 280 to 290 ° C. and 37 circular spinning balls and 37 shaped cross-section spinnerets under the conditions shown in Table 1 and FIG. Discharge at 34.2 kg per minute through spinnerets arranged in columnar and lattice form, wound at a spinning speed of 1260 m / min, and stretched at a stretching speed of 1200 m / min and a draw ratio of 3.254 to obtain 75 denier stretched mixed yarns.

Each type of stretch-blended yarn manufactured under such conditions was sized under the same conditions, and then used as a warp yarn to weave at the same condition and the same warp density to obtain a palace fabric processed under the same condition.

The gloss uniformity and incidence of band-like glossiness of the fabrics according to the synthetic fiber blended yarns of each type are shown in Table 1.

Gloss uniformity and incidence of band-like glossiness were determined visually.

[Comparative Examples 1 to 3]

Through a spinneret in which 37 single-sided spinnerets of one type were arranged in a lattice shape, the result was a parawoven fabric that was spun, stretched, sized, woven, and processed under the same conditions as in Examples 1-3. Table 1 shows the gloss uniformity and the incidence of band-like glossiness of the fabric according to the release cross-section filament yarn for each shape.

Comparative Example 4

In order to examine the effect of the ratio C of the circular yarns in the spinnerets in which two or more of the circular yarns and the circular cross-section yarns were arranged in a circumferential or lattice shape, a lace fabric was obtained under the same conditions as in Example 2. Gloss uniformity and glossiness generation rate according to C (%) are shown in Table 1.

Gloss uniformity was very good and gloss plaque incidence was low, but elegant gloss like a natural dog could not be obtained.

[Comparative Examples 5-6]

To investigate the effects of Q2 / Q1, Q3 / Q1, Q3 / Q2, etc. in the spinnerets arranged in two or more circumferential or lattice shapes in the circular yarn and the circular cross-section, the Q2 / Paralace fabrics were obtained according to changes in Q1, Q3 / Q1, Q3 / Q2, and the like. Table 1 shows the gloss uniformity and glossiness rate according to the change of Q2 / Q1, Q3 / Q1, Q3 / Q2.

TABLE 1

● Radiation hole type: The number in parentheses indicates the ratio of the discharge amount discharged from each spinning hole. Ex) 1: 2: 3

Gloss uniformity

◎: very good, 0: good, △: normal,

.X: bad,

.

Glossy panel incidence: Bend phase glossiness per million yards of fabric (%)

Claims (1)

At least two or more types of hetero-section spinnerets of a circular radiator, an equilateral triangle, three Y-shaped and T-shaped heterosections are arranged in the same spinneret in a circumferential or lattice form. (2) Spinnerets for the production of synthetic fiber blended yarns capable of co-spinning, designed to satisfy the requirements of), (3) and (4).

C: The ratio of circular radiators to equal radiation detention S: Number of circular radiators in the same spinneret T: Number of radial cross-section holes in the same spinneret

Q ₁ : Discharge amount of circular yarn in the same spinneret Q ₂ : Discharge amount of one type of cross section spinneret in the same spinneret Q ₃ : Discharge amount of another type of cross section spinneret in the same spinneret

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