KR910002286B1 - Method for preparation of polyamide spun-like yarn - Google Patents

Abstract

Both a core yarn and a effect yarn which consist of polyamide multifilaments are fed into feed rollers (1),(2) and then into tension control rollers (4),(5). The processed yarn are interlaced by air nozzle (6). Then the mixed yarn are fed into feed rollers (7)(8), heat treated and oiled. The resulting polyamide air-textured spun-like yarn excels in dimensional stability, weavability due to uniform, frequent and stable loops, which are different from conventional air textured yarns.

Description

Manufacturing method of polyamide spun-like company

1 is a process schematic diagram of the present invention.

2 is a view for explaining a cross section of the processed yarn produced by the present invention.

3 is a planar photograph of a processed yarn manufactured by the present invention.

4 is a planar photograph of a processed yarn manufactured by a conventional method.

Figure 5 is a photograph of the surface of the woven fabric processed by the present invention.

Figure 6 is a photograph of the surface of the fabric woven with a processed yarn manufactured by a conventional method.

* Explanation of symbols for main parts of the drawings

X: Core yarn (polyamide multifilament yarn) Y: Effect yarn (polyamide multifilament yarn)

1, 2, 7, 8: feed rollers 4, 5: tension control rollers

3: hot fin roller 6: air nozzle

9: heater

The present invention relates to a method for producing a polyamide spun-like yarn having a multi-layered structure using polyamide-based multifilament yarns having a frequency of surface loop expression and a size of the loop almost similar to cotton.

Conventional methods for producing polyamide spun-like yarns include a method of intertwining cores and effect yarns, a method of performing air jet processing, imparting crimps to the effect yarns or improving the feel of the yarns or fabrics, or in a suitable temperature range. There have been proposed methods of partially welding the yarns and combusting them, as well as some combinations of the above methods. However, the method of mutually twisting core and effect yarns is not economical due to the high manufacturing cost, and the method of performing air jet processing causes dyed spots due to non-uniformity of surface loops, resulting in deterioration of product quality and fusion. The method has a limited volume in the absolute length of the effect yarn surrounding the core yarn is rich in volume, it is difficult to manufacture a spun-like yarn, a combination of some of the above method is a problem of rising manufacturing cost In addition, there is a difficulty in process control.

SUMMARY OF THE INVENTION The present invention solves all the problems of the prior art, and combines a method of expressing a finer, more uniform, and more frequent loops than the conventional air texturead, and a method of stabilizing the loops as described above to form a surface loop. The present invention relates to a method for producing a polyamide Ait-textured spun-like yarn having a small size, uniformity and excellent shape stability and weaving workability.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1 shows a manufacturing process of the present invention, in which two polyamide-based multifilament yarns (X) (Y) are supplied as the supply yarns, but the core yarn (X) passes through the feed roller (2) and the effect yarn (Y). Pass through the feed roller (1) and the hot pin roller (3), respectively, after adjusting the tension by the tension adjusting roller (4) (5) is injected into the air nozzle (6). The air texturized yarn in the air nozzle 6 passes through the heater 9 after passing through the pitrala 7 and 8 to stabilize the uniform and fine loops expressed in the air nozzle 6. Subsequently, the take-up roll 12 is wound around the intermediary trolley 10 and the oil ring roller 11.

In the present invention, the core yarn (Y) can be prevented from being bulky when the processing yarn is subjected to the tensile force by passing through the hot pin roller (3) of 80 ℃ -120 ℃.

In order to form a fine, uniform and high frequency loop, which is the most important factor pursued by the present invention, the feed amount of the feed roller (1) (2) to the feed roller (7) is important. It must be in the scope of (II).

Below

0.15……………………………………………………………(I)｜ F _e / F _c -1.35 ｜

0.15... … … … … … … … … … … … … … … … … … … … … … … (I)

F_e

1.35……………………………………………………………………(Ⅱ)1.05

F _e

1.35... … … … … … … … … … … … … … … … … … … … … … … … … … (Ⅱ)

only,

F _e : Linear velocity (m / min) of feed roller (1) / linear velocity (m / min) of feed roller (7)

F _c : Linear speed of feed roller (2) (m / min) / Linear speed of feed roller (7) (m / min)

When F _e <1.2F _c in formula (I), the frequency of the loops is too small to produce natural tactile sensation, and when 1.5 F _c <F _e , the workability of the processed yarn is increased due to the excessive overfeed rate of the effect yarn (Y). This is greatly reduced.

In addition, as shown in equation (II), when the linear velocity ratio of the feed roller 2 to the feed roller 7 of the effect yarn Y is larger than the upper limit F _e = 1.35, it is necessary to manufacture the processed yarn due to excessive margin length. Is not possible, and if the lower threshold, F _e = 1.05, is not only irregular loops are expressed, but there is a high probability of trimming. In addition, the most important factor for obtaining a uniform loop is the tension applied to the core yarn (X) and the impact yarn (Y), and the tension is maintained as shown in the following formulas (III) and (IV) to obtain a good quality processed yarn. Can be.

Below

T_c(

×T_e)

0.15……………………………………………(Ⅲ)0.01

T _c (

× T _e )

0.15... … … … … … … … … … … … … … … … … (Ⅲ)

only,

T _c : tension of core yarn (g)

T _e : Tension of the effect yarn (g)

D _c : supply denier of core

D _e : Effect Denier

T_A

1.35T_c…………………………………………………………………(Ⅳ)0.75T _c

T _A

1.35T _c . … … … … … … … … … … … … … … … … … … … … … … … … (Ⅳ)

only,

T _A : Tension of processed yarn discharged from air nozzle (g)

)×T_e가 되면 코아, 이펙트의 발현이 되지 않으며, T_c＞0.15×

)×T_e가 되면 불균일한 루우프가 발현되어 염색단이 나타나게 된다.In formula (III), T _c <0.01 ×

) × T _e does not produce a core or effect, and T _c > 0.15 ×

In the case of) × T _e , a nonuniform loop is expressed and a chromophore appears.

In the formula (IV), when 0.75T _c ＞ T _A , the loop frequency and crackability are somewhat improved, but the workability is greatly reduced.When 1.35T _c <T _A , the loop is difficult to express and the frequency is greatly reduced. Excessive force is applied to the air nozzle to shorten the life of the air nozzle.

Passing through the heater 9 the product produced by satisfying the formulas (I) (II) (III) and (IV), the loop is stabilized and deformation due to elongation is reduced. It is preferable to set the temperature of the heater 9 to 170-210 ° C., and at 210 ° C. or higher, the crystals inside the yarn become larger and the recrystallization degree decreases, so that the amorphous region becomes relatively larger than before the heater passes through the dichroic yarn. (異 色系) has a problem that a lot occurs.

On the other hand, when the temperature is lower than 170 ℃, the morphological stability of the processed yarn is inferior, and the twisting of the yarn occurs frequently during weaving, which greatly reduces the weaving efficiency. It is easy to lose fabric quality. In addition, the expression effect of the loop in the present invention is excellent as the monofilament fineness less than 1.5g / d of core, effect company, the more the number of monofilament, the higher the air pressure is about 7-9kg / cm ² .

The air-textured spun-like yarn manufactured by the present invention has excellent shape stability against tensile force, and since the loop is uniformly well expressed on the surface of the yarn, the weave and knit fabric are similar to natural cotton weave and knit fabric in terms of volume and feel. It can be used for out-shells such as jackets, jumpers, ski suits, etc. because it exhibits one characteristic and is excellent in heat retention and windproofness and excellent anti-pilling.

EXAMPLE 1, 2, 3 COMPARATIVE EXAMPLE 1, 2, 3

(However, the user is a nylon)

As a result of observing the yarns manufactured under the conditions of (Examples 1, 2 and 3), the surface loop expression was good and the shape stability was also excellent. The fabric showed almost the same quality as cotton due to the volume and texture of natural fibers. (See FIGS. 2, 3 and 5)

(Comparative Example 1) showed that the effect frequency of the effector's overfeed rate was low, so the expression frequency of the loop was decreased, and weaving was not able to express natural touch, and because the heater temperature was lower than the optimum value, the shape stability against the tensile force was poor. The thread was twisted, which lowered the work efficiency.

(Comparative Example 2) is the same as in (Example 2) and other conditions, but because of the high tension of the impact yarns, the expression of the loop is uneven, and the dyeing stage (irregular two-tone effect) occurred during dyeing.

In Comparative Example 3, the air pressure was so low that the loops were uneven and the frequency was too small to express a cotton-like touch.

The photograph of the processed yarn manufactured by (Comparative Examples 1, 2, 3) and the woven fabric was the same as FIG. 4 and FIG.

Claims (1)

Using one core yarn (X) and one effect yarn (Y) made of polyamide-based multifilament yarns, they were passed through feed rollers (1), (2) and tension adjusting rollers (4) and (5), respectively. In the preparation of the polyamide spun-like yarn by entangled in the air nozzle 6, passed through feed rollers 7 and 8, heat treatment and oiling, the following general formulas (I), (II) and (III) ) And (IV) to satisfy the polyamide spun-like manufacturing method. Below ｜ F _e / F _c -1.35 ｜

0.15... … … … … … … … … … … … … … … … … … … … … … … … … (I) 1.05

F _e

1.35... … … … … … … … … … … … … … … … … … … … … … … … … … … … (Ⅱ) only, F _c : Linear speed of feed roller (2) (m / min) / Linear speed of feed roller (7) (m / min) F _e : Linear velocity (m / min) of feed roller (1) / linear velocity (m / min) of feed roller (7) 0.01

T _c / ((D _c / D _e ) × T _e )

0.15... … … … … … … … … … … … … … … … … … … … (Ⅲ) 0.75T _c

T _A

1.35T _c . … … … … … … … … … … … … … … … … … … … … … … … … (Ⅳ) only, T _c : Tension of core thread (g) T _e : Tension of the effect yarn (g) D _c : Supply Denier of Core D _e : Effect Denier T _A : Tension of the thread passed through the air nozzle (g)

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