JPS5813714A - Wet spinning nozzle - Google Patents

Abstract

PURPOSE:To titled nozzle, having spinning holes with different diameters arranged according to the diameters thereof in the outer peripheral, central and the rest parts in a specific proportion, and capable of reducing the coefficient of variation in the fineness or below by a simple apparatus. CONSTITUTION:Spinning holes having diameters d1, d2 and d3 satisfying the following relation: 0.60(d1)<4=(d2)<4=0.89(d1)<4> and 1.1(d3)<4> <=(d2)<4=1.3(d3)<4> are ar ranged in the whole surface of a nozzle or the respective divided surfaces of the nozzle as follow: Spinning holes having a diameter (d1) in the number of 10- 20% total holes are arranged in the outer peripheral part, and spinning holes having a diameter (d3) in the number of 2-10% total holes are arranged in the central part. Spinning holes having a diameter (d2) in the number of 88-70% total holes are arranged in the rest part. Thus, the coefficient of variation in the fineness can be reduced to 10% or less.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an O#1 type yarn depositing nozzle for obtaining acrylic fibers with a small variation in fineness. This is a round OI1 type spinning nozzle KII manufactured on an industrial scale using S-wave inorganic salt water.

Reducing the am fluctuation rate stabilizes the spinning process and improves fiber performance! This is also due to improvements in the performance of acrylic carbon bulk fiber Ila. Conventionally, methods have been proposed to reduce the fineness fluctuation rate by strengthening the F ratio, strengthening nozzle cleaning, rectifying the spinning bath, subdividing the discharge unit, etc.; I'm already trying to get it down to 1
In particular, it is necessary to use spinning equipment, doubling and rounding equipment, etc., and an excessive 7 IkWk of equipment is required.

% xtt* spinning using zinc chloride-based inorganic salt water S wave as a solvent
When discharging into a bath, the temperature at the time of solidification increases due to the heat of dilution of zinc chloride, and the straight fluctuation rate tube increases to φ. In other words, this Q dilution heat is mostly generated at the outer periphery of the nozzle (a certain %/1 is a group of spinning holes) because a large amount of condensation -@Km comes into contact with the spinning yarn immediately after the spinning tube is discharged. When the temperature rises by 1 kVh, the temperature rises at the center of the nozzle even though the coagulation to diffusion is small.

Therefore, a difference in the viscosity of the 1-multispun stock solution occurs due to the #1fIAjI difference between the center and the outer periphery of the nozzle, resulting in a difference in the discharge amount.

KFi, which reduces the temperature difference during solidification, nozzle wiK
Spacing of spinning holes (circle pitch and step pitch J
For example, by increasing the size of the nozzle or dividing the nozzle into appropriate lengths and arranging the spinning holes, for example, by using a coagulation device in
A method of spinning with a spinning hole number of 100 or less,
From the center of the nozzle] Condensation case f: It is conceivable to adopt a method of forcibly discharging the condensate.

However, in the above method, the fineness variation rate is 15-
It is difficult to do the following;
In this case, excessive equipment costs will be required.

The present invention aims to solve the above-mentioned OSS shortcomings and to provide a wet spinning nozzle that can reduce the fineness variation to 10 seconds or less with a very simple device.

Here, the fineness variation rate is calculated by the following formula.

The misfired tSO wet spinning nozzle is for producing acrylonitrile polymer fiber using aqueous zinc chloride inorganic salt. In this case, the spinning holes with diameter d1 have a total number of lθ~20 holes, and the spinning holes with direct ads have a total number of 02~101 holes! A spinning hole with a diameter d is placed in the center and the total number of holes is 088 to 70 - the remaining part is n1 and dl m dl m dl m
The relationship of t satisfies the following formula %() ().

In the nozzle of the present invention, spinning holes with a total number of holes of 02 to 10 sK are arranged at the center, and the diameter of the spinning holes is
By making the diameter smaller as shown in the equation, it is possible to prevent the viscosity from decreasing due to the heat of dilution and excessively discharging the spinning JILt.On the other hand, the diameter of the spinning hole is By increasing , dl as in formula 0, the discharge amount can be prevented from becoming too small, and the fineness fluctuation rate can be reduced to 109! It is designed to: If the number of spinning holes with a diameter of 3 is less than 0.2 tatami, excessive denier fibers will be produced, and if it exceeds 10 denier, KFi
Although the much larger denier decreases, the smaller denier fiber S increases.

Regarding Matanao II tlm, 'Ll ds)'> (
In the case of dtJ', the effect of reducing over-denier fibers is 1<, (dl3'> L3 (d1'), the number of under-denier O fibers increases.

The number of spinning holes with straight 11 at is the total number of holes 010
If it is too long, too little denier fibers will remain, and if it exceeds 20 degrees, too much denier fibers will be produced, and the draft in the coagulation bath will become too high, producing the sound of single filament breakage. Regarding the diameter d, if α60 (dI)'>(dtJ', the excessive denier increases, and (d*j'> α89(d
In the case of t)', there is no effect of reducing underdenier.

Therefore, the pore diameter and pore number ratio of dI m d, I d, and e can be reduced to 10 or less for fineness variation only when all the conditions are satisfied.

The diameter of the nozzle for spinning acrylic polymer fibers is generally 0.
．． 06～α18■φ1! The diameter d of the spinning hole arranged in the nozzle of the present invention is also usually this I
It is ll[%. Diameter d of C, Diameter d and d3 based on K are calculated from formulas ■ and ■.

Hereinafter, the present invention will be referred to as i! by IEI~3wJK. I will clarify.

The thread is the spinning hole! All the nozzles are arranged uniformly on the outer periphery, with spinning holes t-dtt center IIc diameter d
It is a nozzle with

In Figure 2.3, the spinning hole is divided into certain groups of spinning holes with nine nozzles), and in such a case, da * for each spinning hole group.
dt r ds and one spinning hole group has 10
The number of holes must be 0 or more. When the number of holes in the group of spinning holes is 100 or less and the number of holes is large, the nozzles are treated as a pile similar to the solid arrangement shown in FIG.

If the nozzle of the present invention satisfies the above conditions,
The shape and number of spinning hole groups are not limited to n; b%, but may be any number t.

5C explains the main relaxation @ 夷m*c19.

Example III Warm brine containing 48% zinc chloride and 10% sodium chloride #1 Spinning mttg containing copolymer sst of 97% acrylonitrile and 3% methyl acrylate as a S medium
gi made t, *, CO spinning J[I[t-2s such nozzles, ie:.

The 6,000 spinning holes were divided into 15 spinning holes, and the outermost periphery of each group was 1 layer (dIJ 0.0 @ 9 ■φ, center part (da)
kα062-ψ, *5ta- is α965wmφ, and each hole number ratio is 1 5s as a percentage of d1.

d, 0% 08 (11, d, O40151!: Using Lm/Zuru, solidify at 10°C in ass water at 345 wg/min in water at speed 't'. The coagulated fL nine threads were stretched 4 times at 4 m/min, then stretched 3 times with O, washed with water from 1 k to 1 k, dried with hot air at 125°C, and α65Ii (gauge pressure) with AC- Perform tS*O abrasive elongation in saturated steam.

Is the tL large fiber Jll obtained in this way an α-denier/filament and a fineness ratio line? , 8 o and Arashiko 6 □ Tsumo Comparative Example 1 Holes 41 of each spinning hole group t dt = 4 = ds =
Other than cLo 65-φ and Shie, he is a close friend of JI Juli and Niku-sama.

The average fiber WL of the obtained fibers was a9 denier/filament, and the fineness variable koji ratio Fil was 5.

Example 2 As shown in Figure 1 <6. With a nozzle in which ooo spinning holes are arranged in the same way,
, d, -H-α062-φ, and measured the fineness fluctuation rate of the thick fibers obtained by # threading in the same manner as in the actual method 1 using nozzles with different hole number ratios, and obtained the results of the 11th R. Ta.

III Table Example 3 I, e with a solid pattern nozzle having aooo o spinning holes
Example 1 Using the nozzle TW with each hole diameter as the ratio of the number of holes for each of 'l m ljl * 20 tatami, 7s long, 5s
KljM was released as well. The fineness variation rate of the obtained thick fibers was measured, and the results were 1* as shown in Table 2.

Summary 2 Example 4 d, * d! *'3 was spun according to Example 1 using a nozzle tite as shown in FIG. 2 with the distribution as shown in Table 3.

Table 3 Average edge of the fibers obtained! is 0.90 denier and the fineness change rate is! &, 9-, which was good.

[Brief explanation of the drawing]

Nos. 1 to 31i are schematic diagrams showing 1llI of the wet spinning nozzle of the present invention. '□ :・1・1 Patent applicant Toho Pesrono Co., Ltd. Daishioiri Benshishi Doi Sanbe

Claims (1)

[Claims] Zinc chloride-based inorganic salt water tI! This is a nozzle for producing acrylonitrile-based heavy content fiber using the method, and the diameter d in all the nozzles or in each divided part of the whole nozzle. The spinning hole has a diameter of -1 at the outer periphery of 10 to 20s of the total number of holes:b The spinning hole has a diameter of -1 at the outer circumference of 2 to 10 of the total number of holes
And the number of spinning holes with straight 't at is 811 of the total number of holes.
1 to 7011 are distributed to each of the rural areas, and i, I
A wet spinning nozzle with ID″r6 in which the relationship between a, e, and dl satisfies the following formula.