JPH09157941A - Latent crimpable conjugate fiber and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a latent crimpable conjugate fiber excellent in bulkiness, strechability, drape property and touch feeling and useful for woven fabric, etc., by passing the component A through a spinneret in the longitudinal direction to discharge the component A, introducing the component B from the transverse direction above the position within a prescribed value from a discharge part which is common to the component A and conjugating the components A and B. SOLUTION: In carrying out conjugate spinning of a high-viscosity component A having 0.70-0.85 intrinsic viscosity and a low-viscosity component B having 0.45-0.57 intrinsic viscosity into side by side type, the component A is discharged by passing the component A through a spinneret in the longitudinal direction 1 and the component B is introduced from the transverse direction 2 above the position within 10mm from a discharge part 4 which is common to the component A and the components A and B are conjugated to provide the objective latent crimpable conjugate fiber having (i) >=4 numbers/cm difference between numbers of crimps before and after boiling water treatment, (ii) >=40% apparent shrinkage factor, (iii) >=0.15g/d shrinkage stress, (iv) >=3.0 g/d breakage strength, (v) 40-70% breaking elongation and (vi) 4-10d single fiber denier.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a latently crimpable conjugate fiber and a method for producing the same. More specifically, when a woven or knitted fabric is made of a composite fiber composed of a high-viscosity component and a low-viscosity component, a composite fiber capable of forming a high-grade woven fabric having bulkiness, expansion, tension / waist, resilience, and elasticity The manufacturing method is related.

[0002]

2. Description of the Related Art A bulky processed yarn having a loop and a slack formed by air-entanglement of a twisted crimped yarn and a polyester yarn is proposed in Japanese Patent Laid-Open No. 2-307924. ing. Although this processed yarn is made bulky due to loops and slack existing on the surface, the yarn inside the yarn, that is, the yarn forming the so-called core, does not have a bulging feeling, and therefore the processed yarn is bulky. However, the fabric obtained by weaving and knitting could not be given a feeling of swelling. Japanese Patent Application Laid-Open No. 3-193945 discloses a method for producing a composite yarn, which has a wrinkle-proof property and a bulkiness, and is capable of obtaining a woven fabric exhibiting an ultra-soft texture. Since the constituent fibers are flat yarns that do not exhibit crimps, there is a problem that the stretchability of the woven fabric is insufficient and the wearing feeling is impaired.

Various methods have been adopted to impart excellent stretchability to the woven fabric. For example, there is a method of using a polyurethane-based yarn having excellent elasticity as a yarn constituting a woven fabric. However, this polyurethane yarn has a drawback that the texture is hard as a property peculiar to polyurethane, and thus the texture of the woven fabric is lowered, or the drape property of the woven fabric is reduced. In order to avoid this drawback, it has been practiced to weave a woven fabric by using a polyurethane yarn and a polyester yarn together. However, there is a difference in dyeability between the polyurethane-based yarn and the polyester-based yarn, and the dyeing process becomes complicated when dyeing the fabric, or the desired color (often a dark color) is dyed. It had the drawback of becoming difficult.

On the other hand, Japanese Unexamined Patent Publication No. 4-240231 discloses a mixed yarn composed of a polyester multifilament having a difference in dry heat shrinkage and a conjugate filament having a spontaneous elongation. However, since the conjugate filaments of the mixed yarns are spontaneously elongated by heat treatment, a flat multifilament is arranged in the core portion and the conjugate filaments are arranged in the sheath portion when the fabric is formed, and the stretchability due to crimping is insufficient. There is a problem that the skin feels bad and the feeling of wearing is impaired.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and is extremely soft and swelling, has excellent sewability, and can be sewn on a fabric having tension / waist, resilience and drape. To provide a woven fabric having an appropriate stretchability (stretchability) which improves the tailoring and appearance of the fabric and gives a comfortable wearing comfort without using a polyurethane-based yarn, and a method for producing the same. With the goal.

[0006]

The present invention has the following arrangement to attain the above object. That is, the high viscosity component A
A composite fiber in which the low viscosity component B and a low-viscosity component B are pasted together in a side-by-side type (1) Difference in crimp number before and after boiling water treatment (expressed crimp number) 4
Co / cm or more (2) Apparent shrinkage rate 40% or more (3) Shrinkage stress 0.15 g / d or more (4) Breaking strength 3.0 g / d or more (5) Breaking elongation 40 to 70% (6) Single yarn A latent crimpable conjugate fiber characterized by having a denier of 4 to 10 d. In addition, when using the composite fiber composed of the high-viscosity component A and the low-viscosity component B, when the A component and the B component are subjected to side-by-side composite spinning, the A component is ejected through the spinneret in the longitudinal direction, and the same ejection as the A component. A method for producing a latently crimpable conjugate fiber, which comprises introducing a component B from above in the lateral direction within 10 mm from the part and making it composite.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The latently crimpable conjugate fiber of the present invention is obtained by laminating two-component polymers having different viscosities in a side-by-side type and performing a composite spinning. The conjugate fiber of the present invention has a latent crimp property, and the difference in crimp number before and after boiling water treatment (expressed crimp number) is 4 co / cm.
The above is necessary. If it is less than 4 cm / cm, the bulkiness is poor and the stretchability is insufficient, and the bulkiness and stretchability of a woven fabric are insufficient. It is preferably 10 pcs / cm or more, more preferably 15 pcs / cm or more.

The expression crimp number is a value measured by the method described below. A sample cut into a length of 7 cm is treated with boiling water at 100 ° C. for 15 minutes in a free state. Immediately after taking out, it is treated with cold water for 1 minute, and then naturally dried for 5 hours. The dried sample is pasted on the sample plate and the width is 1c.
Cover the slit plate of m with a projector and read the number of crimps on the screen. 10 samples are measured at n = 2.

The apparent shrinkage of the composite fiber of the present invention is 40%.
The above is necessary. If this value is less than 40%, the bulkiness is poor and the stretchability is insufficient similarly to the above-mentioned number of crimps to be developed, and the bulkiness and stretchability are also insufficient when formed into a woven fabric. Therefore, the apparent shrinkage ratio is preferably 50% or more.

The apparent shrinkage ratio of the present invention is a value measured by the method described below. It is wound 10 times with a tape measurer without applying tension, and a load of (0.01 g / d × 10 × 2) g is applied to this to measure the original length (l ₀ ). Remove the load and make it free and perform boiling water treatment at 100 ° C for 15 minutes. Immediately after taking out, it is treated with cold water for 1 minute, and then naturally dried for 5 hours. After applying the above load and waiting for 30 seconds, the post-treatment length (l ₁ ) is measured. Calculate from the following formula. Apparent shrinkage rate = (l ₀ −l ₁ ) / l ₀ × 100

Next, the shrinkage stress of the composite fiber of the present invention is 0.1.
It is required to be 5 g / d or more, preferably 0.2 g / d or more, and more preferably 0.25 g / d or more. If the shrinkage stress value is less than 0.1 g / d, sufficient bulkiness cannot be imparted to the woven fabric, and the bulge, tension, and stiffness are poor, and the object of the present invention cannot be achieved.

The strength of the present invention is required to be 3.0 g / d or more, preferably 3.5 g / d or more. Strength is 3.0g /
If it is less than d, fluff and yarn breakage are likely to occur in the raw yarn manufacturing process, and yarn breakage frequently occurs during false twisting in the higher-order processing process, resulting in reduced operability. In addition, unfavorable problems such as a reduction in tear strength of the woven and dyed-finished cloth may occur.

The elongation of the composite fiber of the present invention is required to be 40 to 70%, preferably 45% or more. If the elongation is less than 40%, fluff and yarn breakage are likely to occur in the raw yarn manufacturing process, and the yarn breakage frequently occurs during false twisting in the higher-order processing process, resulting in deterioration in operability.

The strength and the elongation have contradictory properties, and the higher the strength, the lower the elongation. On the other hand, the higher the elongation, the strength becomes too low, which is not suitable for practical use.

The number of crimp occurrences, the apparent shrinkage ratio,
Shrinkage stress, strength, and elongation are closely related, and details thereof will be described later, but these cannot be satisfied at the same time unless certain specific conditions of the conjugate fiber of the present invention are satisfied.

The single yarn d of the composite fiber of the present invention needs to be 4 to 10d, preferably 5d or more, more preferably 6d or more. If the single yarn d is less than 3d, the crimping force and shrinkage stress will be insufficient, and when a woven fabric is formed, it will not be able to overcome its clumping force and exhibit sufficient bulkiness and stretchability. Therefore, the single yarn d needs to be 4d or more.

In order to obtain the above-mentioned composite fiber of the present invention, the composite ratio of the high-viscosity component A and the low-viscosity component B is important, and it is preferable that the A component is equal to or more than the weight ratio, more preferably 55: 45, more preferably 60:40, 7
It is within the range up to 0:30.

The high-viscosity component A represents physical properties such as strength and elongation of the composite fiber.
When the ratio is 0:60, the strength and elongation of the composite fiber is lowered and the composite fiber cannot be put to practical use, and many yarn breakages occur during spinning, and further, many yarn breakages occur during drawing, which makes stable operation impossible. The low-viscosity B component has poor spinnability, and if the ratio is increased, it adversely affects the spinning. Conversely, increasing the ratio of the high viscosity A component, for example, 8
When the ratio is 0:20, the number of crimps developed and the apparent shrinkage ratio are lowered, and the bulkiness, bulge and stretchability of the woven fabric are insufficient.

Next, it is preferable that the A component and the B component are bonded side by side so that the boundary surface between the two components is substantially straight. If this is an eccentric arrangement structure in which the A component is the core and the B component is the sheath as shown in FIG. 5, or the boundary surface is a straight line as shown in FIG. 4, the crimp expression performance due to the difference in the physical properties of both components is sufficiently exhibited. Good crimp performance,
The crimp expression performance of the conjugate fiber of the present invention is further improved. When the contact angle of the boundary surface is α, α is ± 20.
Up to a degree.

The crescent shape indicates that α is greater than 20 degrees, and the eccentricity is half or more covered with the A or B component polymer.

The intrinsic viscosity of the composite fiber is 0.58 to 0.68.
Is more preferable, and more preferably 0.60-0.
66, and more preferably 0.62 to 0.64. The intrinsic viscosity of this composite fiber depends on the composite ratio of A component and B component, and A
It is determined from the intrinsic viscosities of component B and component B. When the intrinsic viscosity of this composite fiber is less than 0.58, for example, 0.56, the strength and elongation of the raw yarn are practical, and the operation stability during spinning and drawing is good. In addition, when the intrinsic viscosity of the composite fiber is 0.68 or less, the crimp development performance is improved and the woven fabric has a sufficient crimp development power, and exhibits good bulkiness and stretchability.

The intrinsic viscosity (IV) of component A is 0.70
0.85, the intrinsic viscosity (IV) of the B component is 0.45 to 0.
57, A and B both have an intrinsic viscosity difference (ΔIV) of 0.20
A range of 0.40 is preferred. The IV of the component A is set to 0.70 or more and 0.85 or less so that the strength and elongation of the raw yarn is maintained and the crimp developability is good. In addition, the operation stability becomes good. Component B has an IV of 0.45 or more, 0.
When it is 57 or less, the strength and elongation of the raw yarn and the spinnability at the time of spinning and drawing are good, and the woven fabric is excellent in crimp expression power and has a high bulkiness and stretchability, which is the object of the present invention. . The IV difference ΔIV between these A and B components is 0.20 to 0.
40 is preferable, and more preferably 0.25 to 0.
35. It is possible to stably obtain a composite fiber having good crimp expression performance and excellent bulkiness and stretchability.

The intrinsic viscosity (IV) referred to here is a temperature of 25.
0.8 g of a sample is dissolved in 10 ml of orthochlorophenol (hereinafter referred to as OCP) at 0 ° C., the relative viscosity (ηr) is determined by the following equation using an Ostwald viscometer, and IV is calculated. ηr = (η / ηo) − (t · d / to · do) IV = 0.0243 ηr + 0.2634 where η: viscosity of polymer solution ηo: viscosity of solvent t: drop time (sec) of solution d: Solution density (g / cm ³ ) to: OCP fall time (seconds) do: OCP density (g / cm ³ ).

A and B constituting the composite fiber in the present invention
The polymer of the component is easy to handle, easy to develop crimp, easy to exchange shrinkage difference due to heat treatment to bulge of yarn or fabric, easy to give drape property to fabric and dimensional stability. From the above, polyester polymers are preferable.

The polyester for which the components A and B constituting the composite fiber are polyester is terephthalic acid or its lower alkyl derivative (alkanol diester having 1 to 4 carbon atoms) and ethylene glycol, or terephthalic acid or its lower alkyl derivative and ethylene glycol. And at least 70% of polyester units obtained from bis-2-hydroxyethylene terephthalate or a low polymer thereof, or bis-2-hydroxyethylene terephthalate and at least one other component. Is a polyester which is polyethylene terephthalate.

In this case, as the third component, for example, oxalic acid,
Adipic acid, azelaic acid, sebacic acid and other aliphatic dicarboxylic acids, isophthalic acid, phthalic acid, 2-6 naphthalene dicarboxylic acid, diphenic acid and other aromatic dicarboxylic acids, 1-2-cyclobutanedicarboxylic acid and other alicyclic Examples of the dicarboxylic acid include, but are not limited to, these.

The composite fiber of the present invention is used as it is as a warp,
It may be used as a weft or may be mixed with other yarns and used. In addition, false twisting may be applied, false twisting may be mixed, or false twisting may be performed in advance. Alternatively, before or after false twisting, real twisting may be applied, real twisting with other yarns may be carried out, or any combination thereof may be used, and any method for exhibiting the features of the composite fiber of the present invention You can use it for nothing.

Next, the method for producing the conjugate fiber of the present invention will be described. The method for producing a conjugate fiber of the present invention is a conjugate fiber composed of a high-viscosity component A and a low-viscosity component B, and when the A component and the B component are subjected to side-by-side composite spinning, the A component is passed through the spinneret in the longitudinal direction. Discharge, and introduce the B component from the upper lateral direction within 10 mm from the common discharge part with the A component,
It can be achieved by compounding.

The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a front view showing an embodiment of the spinneret of the present invention, FIG. 2 is a sectional view of the spinneret of the present invention, and FIG. 3 is a schematic cross-sectional view of a composite fiber obtained by using the spinneret of the present invention. It is a figure.

Reference numeral 1 is an introduction hole for the high-viscosity component A, and 2 is an introduction hole for the low-viscosity component B. A common discharge hole 4 and a throttle hole 3 which also functions as a discharge meter for supplying the low-viscosity component B polymer from the lateral direction of the introduction hole 1 are provided downstream of the introduction hole 1. The lower part of the introduction hole 1 is narrowed down to provide a common discharge hole 4 for the composite flow, which is opened to the lower surface of the mouth plate 5.

The distance from the position of the mouthpiece surface of the common discharge hole 4 to the center of the throttle hole 3 where the low viscosity component B polymer is discharged and merged is very important, and the cross-sectional shape of the composite fiber is the boundary between the two components. The surface is substantially straight and has excellent crimp development performance. This distance L is 10 mm or less, preferably 7 mm or less, and more preferably 5 mm or less. This is because the high-viscosity component A polymer having a slow flow velocity pulls the low-viscosity component B polymer having a fast flow velocity due to the flow velocity difference between the high-viscosity component A and the low-viscosity component B, and thus the cross-sectional shape is deformed.
The distance L is set to 10 mm or less.

Next, it is important to compound the B component polymer into the A component polymer from the lateral direction of the outer periphery of the die. This is because the composite flow is just below the die discharge hole and the discharge line bends (kneading phenomenon) ) Occurs. By aligning the direction of the knee with the direction of the center of the die, which is a fixed direction, the work of periodically fixing the stain on the die can be efficiently performed in a short time. This kneeling occurs due to the difference in flow rate due to the difference in viscosity between the A and B component polymers, and this bending becomes greater if the A component polymer has a higher viscosity and the B component polymer has a lower viscosity. Further, if it is attempted to combine the components A and B from different directions, the polymer flow path becomes complicated and it is not suitable for practical use.

[0033]

The present invention will be described more specifically with reference to the following examples. Example 1 A high viscosity component A consisting of 100% polyethylene terephthalate (PET) having an intrinsic viscosity (IV) of 0.80, and IV
A low-viscosity component B consisting of PET 100% of 0.50 was made to have a weight composite ratio of A and B of 60:40, and side-by-side composite spinning was performed using the spinneret of FIGS. The cross section of the composite fiber was such that the boundary surface was substantially straight as shown in FIG. The IV of the composite fiber was 0.64. Drawing this composite fiber,
Heat treatment was performed to obtain drawn yarn of 75D-12F (single yarn 6.2d). The physical properties of the yarn are as follows: the number of crimps is 15 / cm, the apparent shrinkage ratio is 60%, the shrinkage stress is 0.25 g / d, and the breaking strength is 3.8.
It was g / d and the elongation at break was 46%. 60 with the above composite fiber
D-144F polyester multifilament stretched yarn was false twisted to obtain a mixed yarn. 10 for the obtained mixed yarn
A twist of 00 times / m was applied to obtain a mixed fiber twisted yarn.

This mixed fiber twisted yarn was used as a warp yarn and a weft yarn to form a plain woven fabric. Then, a crimp development treatment was performed in a dyeing process. The obtained plain woven fabric was rich in loft and stretched, and had excellent drapeability along with the waist and stretchability, and it was a finely woven fabric with a satisfactory wearing feeling. Next, change the composite ratio and change the level No. In the same manner as in No. 1, the level No. 2 to Level No. 5 was obtained. A suit was sewn using the obtained woven fabric, and a wearing test was conducted by 5 experts to judge the feeling of wearing. The evaluation results are summarized in Table 1. The evaluation was made as ⊚: extremely good, ◯: good, Δ: somewhat bad, ×: bad, −: not evaluated. Comparative Example 1 Level No. Reference numerals 4 and 5 are comparative examples for clarifying the present invention. No. 4 has a composite ratio of 40:60 and is low IV
Since the number of sides was increased, the strength and elongation of the raw yarn decreased, and yarn breakage during spinning and yarn breakage during false twisting occurred frequently. No. 5 is A
The composition was extremely increased and the composite ratio was 80:20, and the crimp development performance was insufficient, and the bulkiness and stretchability were insufficient. The results are shown in Table 1.

[0035]

[Table 1] Example 2 Level No. No. 6 is 75D-12F and has a single yarn of 6.2d. No. 7 is 4.1d (75D-18F), No. No. 8 is 9.3d (75D-8F), No. 9 is 2.5d (75
D-30F) No. 10 is 12.5d (75D-6F)
The same as in Example 1 except that the single yarn d was changed. No. No. 6 is No. Same as 1.

The results are shown in Table 2.

Comparative Example 2 No. Reference numerals 9 and 10 are comparative examples for clarifying the present invention. No. In No. 9, the single yarn d was thinned to 2.5 d, and the crimping property was good, but the strength and elongation were out of the range of the present invention, and many yarn breakages occurred during spinning and many yarn breakages during false twisting. No. 1
In No. 0, the single yarn d was thickened to 12.5d, and the crimp expression performance was insufficient and the bulkiness and stretchability were insufficient. The results are shown in Table 2.

[0038]

[Table 2] Example 3 No. 11 to 15 relate to the boundary surfaces of both the A and B components. No. No. 11 is No. Same as 1. No. 1
In FIG. 2, the distance L is 2.0 mm and the composite position is close to the common discharge hole, and the boundary surfaces A and B are substantially straight lines. Strictly looking at the boundary surface, the component A polymer, which is a high-viscosity polymer, was a reverse crescent moon enclosing the component B polymer, and α was −5 degrees. This α
To explain the plus and the minus of the plus, the plus is A on the B component side.
The component side is covered, and the minus side is the shape in which the A component side covers the B component side. No. No. 12 had no problem with each characteristic value, and the overall judgment was ⊚. No. In No. 13, the distance L was 10 mm, and α was +18 degrees. The overall judgment was ○, which satisfied the present invention. The results are shown in Table 3.

Comparative Example 3 No. Reference numerals 14 and 15 are comparative examples for clarifying the present invention. No. No. 14 has a distance L of 15 mm and has a crescent-shaped cross section as shown in FIG. 15 is the distance L is 25
The cross-sectional shape was an eccentric core-sheath shape as shown in FIG. No. The crimp development power of both 14 and 15 was insufficient and did not satisfy the requirements of the present invention. The results are shown in Table 3.

[0040]

[Table 3] Example 4 No. Nos. 16 to 20 are those in which IV is changed. 16
Is No. Same as No. 1, No. 1 17 and 18 are IV of composite fiber
Was set to 0.58 and 0.70, which changed IV-A while keeping IV-B constant. No. No. 17 was a permissible level in terms of crimp characteristics, strength and elongation, and bulkiness of the product. No. In No. 18, some yarn breakage occurred during spinning and processing, but it was at an acceptable level. The results are shown in Table 4.

Comparative Example 4 No. Reference numerals 19 and 20 are examples for clarifying the present invention. No. In No. 19, the composite fiber IV was out of the range of 0.55, IV-A was out of the range of 0.68, and ΔIV was out of the range of 0.18. The obtained composite fiber had no crimp property, strength and elongation. Was enough. No. In No. 20, IV-A was 0.95, which was out of the range, IV-B was 0.40, which was out of the range, and ΔIV was 0.55, which was out of the range.

[0042]

[Table 4] Example 5 This is an experiment in which the IV value was changed following Example 4. N
o. Nos. 21 and 22 are obtained by fixing IV-A and changing IV-B. No. 21 had some yarn breakage in spinnability and false twisting processability, but was at an acceptable level. No. No. 22 was slightly inferior in crimp property, bulkiness, stretchability, and wearing feeling, but reached an acceptable level for the time being. Table 5 shows the results.

Comparative Example 5 No. Reference numerals 23, 24 and 25 are comparative examples for clarifying the present invention. No. In No. 23, IV-B was lowered and the spinnability and processability were extremely poor. No. In No. 24, IV-B was increased, and the crimp property as a composite fiber was insufficient. No. 25 is the same IV for both A and B components
However, no crimp expression was observed.

[0044]

[Table 5]

[0045]

EFFECTS OF THE INVENTION By using the composite fiber of the present invention, it is possible to obtain a high-grade woven fabric which is rich in bulkiness, excellent in stretchability, has a soft texture and drape, and has a soft texture.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a spinneret used in the present invention.

FIG. 2 is a longitudinal sectional view showing a main part of a mouthpiece discharge hole portion used in the present invention.

FIG. 3 is a schematic view showing a cross-sectional shape of the yarn of the present invention.

FIG. 4 is a schematic view showing a cross-sectional shape of a yarn obtained in a comparative example.

FIG. 5 is a schematic view showing a cross-sectional shape of a yarn obtained in a comparative example.

[Explanation of symbols]

 1; Introducing hole 2; Introducing hole 3; Throttling hole 4; Common discharge hole 5; Die plate A; High viscosity component B; Low viscosity component

Claims (7)

[Claims] 1. A composite fiber in which a high-viscosity component A and a low-viscosity component B are pasted together in a side-by-side type. (1) Difference in crimp number before and after boiling water treatment 4 co / cm or more (2) Apparent shrinkage ratio 40 % Or more (3) Shrinkage stress 0.15 g / d or more (4) Breaking strength 3.0 g / d or more (5) Breaking elongation 40 to 70% (6) Single yarn denier 4 to 10 d Latent crimpable conjugate fiber. 2. The latent crimpable conjugate fiber according to claim 1, wherein the composite ratio of both the A and B components is equal to or more than the weight ratio of the A component. 3. The latent conjugate fiber according to claim 1, wherein the A component and the B component are bonded in a side-by-side type, and the boundary surface between the two components is substantially linear. 4. The intrinsic viscosity of the composite fiber is 0.58 to 0.6.
The latent crimpable conjugate fiber according to any one of claims 1 to 3, wherein the latent crimpable conjugate fiber is 8. 5. The intrinsic viscosity of the component A is 0.70 to 0.8.
5. The intrinsic viscosity of component B and component B is 0.45 to 0.57, and the difference in the intrinsic viscosity of both components A and B is 0.2 to 0.4. Latent crimpable conjugate fiber. 6. The latently crimpable conjugate fiber according to claim 1, wherein the components A and B constituting the conjugate fiber are polyesters. 7. A composite fiber composed of a high-viscosity component A and a low-viscosity component B, when the A-component and the B-component are composite-spun into a side-by-side type, the A-component is ejected through a spinneret in the longitudinal direction, and the A-component is discharged. A method for producing a latently crimpable conjugate fiber, characterized in that the component B is introduced from the common discharge part within 10 mm from the upper side in the lateral direction and is compounded.