JPH03199442A - Polyamide thick-and-thin yarn, its production and polyamide cloth with multicolor effect therefrom - Google Patents

Abstract

PURPOSE:To obtain the title yarn with unclear boundary between its thick and thin parts despite large difference in the thickness between them by cooling and solidifying polyamide melt-spun yarn, imparting said yarn with a lubricant followed by incomplete drawing of the yarn under specified conditions between a take-up roller and draw roller. CONSTITUTION:Polyamide melt-spun yarn is cooled and solidified through a cold air unit 2, imparted with a non-aqueous lubricant using an oiling roller 3, and put to interlacing treatment with an interlacing nozzle 5 to impart the yarn with interlaces with an interlace degree of 5-24/m. The resultant yarn is taken with a take-up roller 5 so that the natural draw ratio (NDR) fall at or above 2.25 followed by incomplete drawing between the above roller and a draw roller 6 at a draw ratio (DR) within the range 0.6XNDR<=DR<=0.9XNDR. Thereby, thick parts are formed in partially interlaced parts and non-interlaced single fibers make up thin parts while provided with partial thickness variations, thus obtaining the objective yarn with the thin parts higher in shrinkage rate than the thick parts.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is characterized in that the thickness unevenness of each filament constituting a multifilament is concentrated at one point of the yarn, and the thickness unevenness is randomly distributed between the filaments. This paper describes a polyamide thick and thin yarn having a polyamide thick and thin part, a method for producing the same, and polyamide thick and thin yarns 1 to 1i dyed in different colors.

<Prior art> Conventionally, when a synthetic one-stage undrawn yarn is drawn at a natural drawing ratio of around 4B, thick fibers in the drawn yarn (thick portions) are drawn.
The thin fiber part (thin PJI) emitted /1, and it roared thick and thin.
ing. -(shi(this thick and thin yarn is -(
It is used to create an elegant pongee-like pattern by taking advantage of the dyed spots or thickness of the fabric.

By the way, in Thick and Thin A method has been proposed in which undrawn filament yarn is drawn at a specific tension rt to disperse drawing unevenness (Japanese Patent Publication No. 63363G8g).

h. In order to obtain a thick and thin A7-line with short FIJ dye v1 spots, undrawn yarn or semi-drawn yarn is subjected to fluid treatment to remove 1j of entanglement between fibers, and then A method has been proposed in which the undrawn yarn is drawn at a drawing ratio of .N.

However, in any cash-polyamide 999
In order for the difference between the part and the thin part to be clear and not to be noticed, it is difficult to provide a one-of-a-kind appearance.

Problems solved and solved by the present invention> The present invention f7) l-111'yl 4, conventional σ) 1 to polyamide filament 1, 'I fi comes up and R1 is /i < , 4 Made of polyamide thick and thin △way im, d3 J two 5'l!
[2 Dyed polyamide thick and thin yarn 4
The purpose is to provide 7 pieces.

1st step for TM decision 4 to solve problems.According to Mitsuaki Ki, the inventions (1) to (3) under Ls are l!
i! Served.

(1) Polyamide Thick and Thin
゛Atsu (, 0) Along the 1/-n (another arrangement 1t1) [intermittently, any single fiber fewer than the number of constituent single fibers of the V-n will be randomly phased. 5~
24 fibers/m, in which case ■ Thick portions are formed in the partially interlaced portions, and ■ Non-entangled single m fibers between adjacent partially entangled portions are partially uneven in thickness. A polyamide thick-and-thin yarn which substantially constitutes a thin part while having (21) a thin part having a higher shrinkage rate than that of a thick part; After that, an oil agent is applied, and then incomplete stretching is performed between the first take-up roller and a stretching roller provided downstream of the roller. ] A method for producing polyamide thick and yarn, characterized in that it is carried out under the following conditions: (1) A non-aqueous oil agent is attached as an oil agent.

■ Interlacing degree is 5 to 24 / Tr after oil adhesion
Confounding is performed so that it becomes L.

(2) The spun yarn is taken to a first take-off roller at a take-off speed such that the natural draw ratio (NDR) of the spun yarn is 2.25 or more.

■ Set the stretching ratio (DR) within a range that satisfies the following formula.

0.6x NDR≦DR≦0,9x NDR(
NDR: natural draw ratio of spun yarn) (3) A fabric of polyamide thick and thin yarn, in which the fabric has: , any single fiber has partially entangled parts entangled in a random phase in the range of 5 to 24 pieces/'rrL, and on the other hand, unentangled single fibers between adjacent partially entangled parts are partially thick. It is composed of thick and thin yarns that substantially form thin areas even though they have stripes, and at this time ■ A state in which the dark dyed thick areas rise up from the light and medium dyed ground areas formed by the shrinkage of the thin areas. A polyamide fabric dyed in a unique color that is characterized by the expression of

First, the first invention of the present invention will be described.

In the present invention, partial entanglement refers to a state in which a portion of any single fiber is entangled in a random phase in any cross section constituting the yarn. Therefore, it is distinguished from complete entanglement in which the whole army 1 is intertwined in any cross section mentioned above (of course, this means that as long as the wood quality of the present invention is exhibited, the completely entangled part is minute). (This does not deny that they exist in large numbers.) This partially intertwined area is darkly dyed, but since single fibers that are not involved in the entanglement also coexist, this part exhibits a mild dark dyeing effect.

On the other hand, the single fibers between adjacent partially entangled parts substantially form a thin part, that is, a lightly dyed part. But this simple! IN
(Visually, there is a thickness unevenness, that is, a darkly stained area of each single Il fiber that does not stand out as much as the darkly stained area consisting of the above-mentioned partially interlaced areas. Visually, it has an intermediate density.) are scattered, so
As for the yarn as a whole, dark-colored, intermediate-colored, and light-colored parts coexist randomly, resulting in a natural-looking kasuri-like effect. In relation to the manufacturing method described below, such an effect can only be achieved when the above-mentioned partial entanglement exists in the range of 5 to 24 entanglements/m.

Next, the second invention of the present invention will be described.

The present inventors discovered that the elongation stress curve of an undrawn yarn obtained by melting and discharging polyamide, cooling and solidifying it, applying a non-aqueous oil to it and winding it up was different from that obtained by applying a normal aqueous oil. In addition to knowing that the material exhibits unique behavior, we also determined that these behaviors contribute to the realization of uneven dispersion during stretching.
This invention was completed.

In order to obtain the polyamide thick and thin yarn of the present invention, the polyamide is melted and discharged, cooled and solidified, and then a non-aqueous oil agent is applied, and the degree of interlacing is 5 to 24/m.
It is important to carry out incomplete stretching after the entanglement treatment so that the following results are obtained. In other words, when complete stretching is performed, the stretching starts from the unentangled points, progresses while untangling the intertwined points, and ends when the interlaced points are also completely stretched. On the other hand, if the intertwining points of the undrawn yarn are not completely unwound, a yarn containing a mixture of fully drawn parts and semi-drawn parts will be produced.

At this time, if the knotting force at the interlaced point becomes too strong, the stretching stress concentrates in the vicinity of the interlaced point, resulting in a completely unstretched area that exhibits staining like spot irregularities. It is necessary to perform a mild intertwining treatment so that the stretching extends to the points and also unravels the intertwined parts. At that time, in order to prevent flame generation at minute intervals and a marbled appearance, it is important to carry out an interlacing treatment such that the degree of interlacing does not exceed 24 strands/m before stretching.

In addition, in the present invention, the yarn before drawing is
In undrawn yarns that have the characteristic of generating neck points as shown in Figure 1 of Publication No. 450, it is difficult to mix fully drawn parts and semi-drawn parts; rather, it is difficult to mix fully drawn parts and completely drawn parts. Since only the non-stretched part is separated,
It is necessary that the undrawn yarn exhibits an elongation stress curve such that no neck points occur during drawing.

In the process shown in FIG. 1, polyamide is melted and discharged from a nozzle 1 and solidified in the cold section by a cold air device 2.A non-aqueous oil is applied to the undrawn yarn by an oiling roller 3, and then a first take-off roller 5 is applied. When stretching is performed between the stretching roller 6 provided downstream of the roller, the stretching roller 6
When the stress generated between rollers 5 and 6 is measured by changing the speed (changing the stretching ratio), the unstretched film shows an elongation stress curve that does not clearly indicate the yield point, as shown in the line in Figure 2. It has now been discovered that yarns can be obtained, and therefore undrawn yarns treated with non-aqueous oils are applicable to the present invention.

When the undrawn yarn of the present invention, in which the elongation stress is represented by a curve of Thick spots occur. On the other hand, in the case of the conventional undrawn yarn shown by the curve B, the neck point becomes clear as shown in FIG. 4, and there is no artificial measuring force.

In the present invention, a non-aqueous oil is an oil that does not contain enough moisture to cause spherulite formation on the yarn surface until it is drawn and placed on the melted and discharged yarn, and the amount of moisture that adheres to the yarn is very high. It refers to something that contains 0.5% moisture.

It is generally well known that when moisture adheres to polyamide before stretching, spherulites are instantly formed near the yarn surface. When this undrawn yarn is stretched, high stress is generated because the spherulites unwind in the early stage of stretching, and the stretching stress curve shows a high modulus at the beginning of stretching as shown in Figure 2B.
Since a plateau region then occurs, in the present invention, it is necessary to avoid generating spherulites in the discharged yarn.

That is, oiling roller 3 applies a water-based oil to make the moisture content of the yarn 0.5% or more, and rollers 5 and 6
If incomplete stretching is performed between
Only a change in the drawing ratio between R and R occurs, and only a portion close to a completely undrawn yarn (drawing ratio K) and a drawn yarn (drawing ratio DR) are formed.

The proportion of these elements is determined by a given stretching ratio (DR), but the difference in thickness between the thick part and the sheen part becomes obvious (Fig. 4).

Furthermore, when a water-based oil agent is applied, when spots of water adhesion occur, the elongation stress curve changes depending on the amount of adhesion of water.
This is not preferable because it also causes the problem that the thick portion and the scene portion cannot be controlled. Moreover, the spherulites on the surface of the yarn become defects due to stretching, and if the yarn is incompletely stretched, the yarn becomes weak, which is not preferred in practice. In this regard, according to the present invention, since a non-aqueous oil agent is used, there are no spots of water adhesion and stable quality can be obtained, and there is no generation of spherulites and no weak threads.

In the present invention, if a separate step is adopted in which a non-aqueous oil is applied to the discharged yarn, and the undrawn yarn is wound and then stretched, the undrawn yarn package absorbs moisture and the end surface of the package Since a difference in moisture content with the inside occurs and causes stress unevenness during stretching, the oil must be immediately supplied to the stretching zone after it is attached.

In the present invention, in order to prevent the boundary between the thick part and the thin part of the single fiber Ilt@ from becoming clear, it is necessary to make the degree of interlace of the undrawn yarn to be a light level of 24 threads/m or less. If it is less than 5 strands/m, the binding force during stretching will be weak and even in incomplete stretching, the intertwined portions will unravel at the initial stage of stretching, which is not preferable.

In the present invention, the degree of interlacing of undrawn yarn is defined as
In the figure, the value is measured by the hook-drop method on a yarn that has been entangled with the interlacing nozzle 4 and wound with substantially the same linear speed of the rear rollers 5, 6 and the winder 7. Interlace degree 5~
In order to achieve 24 particles/m, the shape of the interlacing nozzle, the take-up speed, and the supply pressure to the interlacing nozzle may be adjusted as is usually done in the industry.

The partially entangled portion according to the present invention is formed by forming an undrawn yarn having an interlacing degree of 5 to 24 pieces/TrL at a specific magnification (DR),
That is, 0.6x NDR≦DR≦0.9×NC
It can be obtained by stretching within the R range.

Here, NDR is the natural stretching ratio, and in the present invention, the intersection point P of the straight line m of the stretching stress curve in FIG.
Stretching ratio.

In addition, when the take-up speed of the spun yarn is increased, the natural draw ratio (
NDR) will be low, so in that case 0.6xNDR~0
,9x N Q R Even if the yarn is stretched in the range of The dyeing effect becomes less noticeable. Therefore, in the present invention, NDR is required to be 2.25 or more. Depending on the type of polymer and spinning equipment, the spinning speed is 10007+'L.
/, fractional separation is preferably applied.

Next, the third invention of the present invention will be described.

It is well known that undrawn polyamide yarns generally do not shrink, while drawn yarns do. In this regard, in the thick and thin yarn of the present invention, since the stretching ratio in the thick part is small, almost no shrinkage occurs, and the shrinkage ratio is high in the sheen part because the stretching ratio is high. Therefore, when this yarn is made into a fabric and treated with hot water in a dyeing process, the thin part shrinks and the thick part rises accordingly. As is clear from this, when the yarn of the present invention is made into a fabric, the thin part becomes the ground part and is dyed b-lightly while partially containing an intermediate color. At this time, in the cross section that includes the partially entangled part, there are also single fibers that are not involved in the partially entangled part, in other words, have a shrinkage rate different from that of the darkly dyed single fibers that make up the thick part, so this part has different shrinkage. exhibit a condition. Therefore, when this abnormal contraction state occurs due to the contraction of the high contraction thin part, the single fibers interfere with each other and float up. and,
The dark dyed areas due to partially intertwined areas, the intermediate color due to uneven thickness partially present in the thin areas, and the light dyed areas in the thin areas are randomly distributed, resulting in a fabric that gives a natural appearance. .

In addition, the polyamide referred to in the present invention includes nylon 66°, nylon 6, nylon 12. Or copolymers thereof, etc.
These polymers can be melt-spun and drawn to form multifilaments using normal methods, and these polymers contain additives such as matting agents, heat-resistant stabilizers, light stabilizers, antistatic agents, etc. as necessary. Needless to say, it is okay to do so.

As described above, according to the present invention, using the conventional direct spinning and drawing equipment, it is very easy to produce fibers with little variation in quality, although the difference in thickness between the thick and thin parts is large. A polyamide thick and thin yarn whose boundaries are not distinct is provided. Therefore, when the yarn is dyed, the thin part becomes a ground part that partially contains a neutral color, and the thick part is a dark color and is raised, resulting in an elegant textured Kasuri-like uniquely dyed fabric. can get.

<Example> The present invention will be described in further detail using Examples.

Example 1 Using the apparatus shown in Figure 1, the intrinsic viscosity was 1.20.

Polycaproamide containing 0.03 wt% Ti 02 was melted at 265°C, discharged from a nozzle, cooled and solidified with cooling air at 28°C, coated with oil, interlaced, taken off, and immediately stretched to 70 de /24
A trilobal cross-section yarn of f i l was wound.

The oil agent is a non-aqueous oil agent that is made by diluting the undiluted oil agent normally used for textiles with low viscosity mineral oil, and 1 for comparison.
A 0% concentration emulsion (aqueous oil agent) was used. For the interlace treatment, a commercially available interlace nozzle (Dupont IX-34 type) was used, and the degree of entanglement was adjusted by changing the supply air pressure. Entanglement of undrawn yarn The degree was measured according to the hook-drop method.

The results obtained are shown in Table 1.

In addition, the evaluation judgment was based on the following method.

(2) Average length of unstretched portions, number of unstretched portions, and randomness of unstretched portions The dark and light threads of one hue were knitted using a nine-knit 11l (type TN-26) manufactured by Koike Kikai Co., Ltd. in a knitted fabric of 2OCur. This knitted fabric was dyed using acid dye Subranol Dianine G manufactured by Thorney Die Stuff and Chemical Co., Ltd. at a dye concentration of 0.4ow4%.

It was dyed at 80° C. for 40 minutes at a bath ratio of 1:50, washed with water, and air-dried. The unstretched part of this sample was darkly dyed, and the length of the darkly dyed part of the knitted fabric was measured and converted to the unstretched part. The number of unstretched knitted fabrics was determined by counting the number of unstretched knitted fabrics within 1α square. The randomness of the unstretched portion was determined by visual inspection of the presence or absence of periodicity of shading over a length of 2OCrn of the knitted fabric, and those without periodicity were evaluated as good.

Further, the hue shading was visually judged on the dyed and knitted fabric, and those with strong shading were judged as good.

■ Breaking strength yarn
The breaking strength was measured using No. 100 and converted to strength (g/da). The measurement was performed using a test Fl length of 20 cm.

It was carried out at a tensile speed of 20 ctn for 1 minute.

As is clear from Table 1, the thick and thin yarn of the present invention has an appropriate length of unstretched portions and an appropriate number of unstretched portions;
In addition, the randomness of the unstretched portion has good two-tone shading, and the breaking strength is also high.

On the other hand, all of the comparative examples have certain drawbacks. That is, in No. 2, the stretching ratio is too low, so the length of the unstretched part is too long, and the ratio of the unstretched part is too high, so the difference in shade of hue is small. On the other hand, NQ
In No. 6, the stretching ratio was too high, so the length of the unstretched portion was short, and the number of unstretched portions was small.

Nos. 9, 10, and 11 use water-based oils, so periodicity was observed, which seems to be caused by spots of oil (moisture) adhesion, and there is a large difference between darkly dyed areas and lightly dyed areas, but the boundary between them is observed. was too clear.

Nα14 had a high spinning speed and had a poor difference in hue between the unstretched part and the stretched part.

In addition, in No. 7, the length of the unstretched portion was too long and the number thereof was small because the entangling treatment was not performed.

No. 15 is undrawn (II dyed eastern length is short, and
The difference between the dark and light dyed areas became too clear.

Example 2 Yarn NQ2, 4, 5.6, 7°10 obtained in Example 1
, 13.14 and 15 with a density of 105 lines/inch, l
! Dyeed with a density of 8. As a result, the fabric N(1
4, 5, 6.13 exhibit a good lattice-like Kasuri pattern,!
The fabric has an elegant texture with the eastern part standing out.

On the other hand, in the case of Nα2 for comparison, the dark dyed area, which is the unstretched area, was long and there were many, so the color balance was disrupted. Regarding N (17), the darkly dyed areas were long and their number was insufficient.

N010 is the length of the dark dyed part. Although the number was appropriate, there was a periodic shift, and the difference in shading was too clear to give a natural look. Furthermore, Nα14 had little difference in density and was poor in commercial value.

In addition, with Nα15, the difference in shading was clearly expressed, and the pitch was short and marbling-like, making it impossible to express the splashed pattern that is the objective of the present invention.

[Brief explanation of drawings]

Fig. 1 is a route diagram showing one embodiment of the manufacturing process of the thick and thin yarn of the present invention, Fig. 2 is an elongation stress curve showing the relationship between elongation ratio (stretching ratio) and generated stress, and Fig. 3 - 4
The figure is a diagram illustrating the difference in the R-forming condition of uneven thickness due to the difference in the undrawn yarn. Δ...Elongation stress concave line of undrawn yarn applied with non-aqueous oil agent B...Elongation stress curve K of undrawn yarn applied with aqueous oil agent...Stretching ratio at which yield point occurs P...Natural Stretching ratio (NDR), n+... Tangent 1... Cap, 2... Cold air device. 3... Oiling roller 4... Interlace nozzle, 5... Take-up roller 6... Stretching roller, 7... Winder - Figure 1 Figure 2 Stretching ratio (stretching ratio) Figure 3 4 Figure

Claims (1)

[Scope of Claims] (1) Thick and thin yarn of polyamide, [1] The yarn intermittently comprises arbitrary single fibers smaller than the number of single fibers constituting the yarn intermittently along its longitudinal direction. has a range of 5 to 24 pieces/m of partially entangled parts intertwined with a random phase, in which case [2] a thick part is formed in the partially entangled parts, and [3] a thick part is formed in the adjacent partially entangled parts. Although the unentangled single fibers in between have some uneven thickness, they substantially constitute the thin part,
[4] A polyamide thick and thin yarn, characterized in that the shrinkage rate of the thin part is higher than that of the thick part. (2) When polyamide is melted and discharged, cooled and solidified, an oil agent is applied, and then incomplete stretching is performed between a first take-up roller and a stretching roller provided downstream of the roller. A method for producing polyamide thick and yarn, characterized in that complete stretching is carried out under the following conditions [1] to [4]. [1] Attach a non-aqueous oil agent as an oil agent. [2] Interlacing degree is 5 to 24 pieces/m after oil adhesion
Confounding is performed so that [3] The spun yarn is taken up by a first take-off roller at a spinning take-off speed such that the natural draw ratio (NDR) of the spun yarn becomes 2.25 or more. [4] The stretching ratio (DR) is set within a range that satisfies the following formula. 0.6×NDR≦DR≦0.9×NDR (NDR: natural draw ratio of spun yarn) (3) A fabric of polyamide thick and thin yarn, which has [1] Intermittently, the yarn has partially intertwined parts in the range of 5 to 24 pieces/m in which arbitrary single fibers are intertwined in a random phase, which is smaller than the number of single fibers constituting the yarn, and [2] adjacent parts The unentangled single fibers between the intertwined parts are composed of thick and thin yarns that substantially form a thin part, although they partially have uneven thickness. A polyamide thick-and-thin yarn fabric dyed in a unique color, with a dark dyed thick part floating up from a light, medium-dyed ground part.