JPS6375131A - Alternately twisted and gummed yarn - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to an alternating WS n N false-twisted yarn that is free from irregularities in shape and thickness and has excellent twist texture and expression.

(Prior Art) When comparing filament woven and knitted fabrics with spun yarn and silk fabrics, the former is uniform, expressionless and indifferent, and gives a mechanically thin feel. The latter has many variations in thickness, twisting, etc., giving it a warm and expressive feel. Also, mechanically, it has the property of being able to respond to external forces in a soft or flexible manner, as well as in a powerful or flexible manner. These differences are caused by the structure and form of the yarn. In particular, there are major differences in twist, unevenness, and deformation space. Regarding twisting, the former is generally used without twisting or with a very loose twist necessary for weaving. Therefore, the former does not have a mechanical twist texture, nor does it have the visual strength of strings. This is also the reason why woven or knitted fabrics appear smooth. On the other hand, in the latter case, there is sufficient twist convergence, and the threads are pulled together, making the orizui kumiakiri stand out. Regarding the spots, the former is completely uniform with no changes or expressions. As mentioned earlier, the latter has a complexity in which the thick and thin parts, the length of the parts, and the size of the twists are synergistic with each other. These complexities give expression and warmth to woven and knitted fabrics. Also, regarding the space for deformation of the yarn in response to an external force, the former has a uniform spatial form with only gaps between fibers and is small in size. On the other hand, the latter has the complexity of having fluff spaces, loops, curl spaces, crimped spaces, dense and dense spaces from the outer layer to the core, and the richness of their spatial forms, each with varying sizes. The addition of the twist makes it even more complex, giving it a soft, supple, yet strong feel.

This does not mean that improvements have not been made to filament woven and knitted fabrics to address these phenomena. For example, giving crimps to the fibers,
False twisting is applied to yarns with different elongation to create a two-layer structure.
For example, the partially drawn yarn is false-twisted to make a crimped yarn with irregularities, or the yarn is partially glued to obtain an alternately twisted glued yarn. However, these efforts are aimed at capturing the partial characteristics of spun yarns, and the extent of these efforts cannot be said to be sufficient. On the other hand, there are some that even have drawbacks. For example, conventional alternately twisted glued yarns are mainly intended to obtain a twisted texture, and only a woven or knitted fabric with hard and stiff glued parts can be obtained.

(Problems to be Solved by the Invention) Therefore, the present invention seeks to obtain a false twisted glue N yarn that is a filament woven or knitted fabric but can obtain an expression and texture based on visual and mechanical twisting. It is something to do.

This is a schematic diagram showing a cross section of a synthetic fiber, where 1 is a core component made of polyester and 2 is a low melting point component. The function of the low melting point component in the present invention is during false twisting (including the case of simultaneous stretching and false twisting).
In woven and knitted fabrics, alternating twists of yarns are fixed in the tissue, and soluble or easily degradable or both are used for woven and knitted fabrics. It is of a nature that can be easily removed. In this case, the low melting point component may melt or decompose independently of the core component, or the rate of melting may be extremely high. In the present invention, any material may be used as long as the adhesion is dissolved and the core component substantially remains. Specific examples of this low melting point component include those having the following composition, but are not limited to this composition.

Example (1) Example (2) Figure 2 shows the other side of the composite fiber used in the present invention. The same figure (A) shows a case where a part of the fiber surface is covered with a low melting point component, the same figure (B) shows one in which the core component is irregularly shaped, and the same figure (C) shows one in which the core component is divided into two parts. It is.

In terms of non-invention, it is important to satisfy the following requirements. 1
One is that the low melting point components participate in sufficient agglutination. This is generally related to the presence of low melting point components and the degree of coverage of the fiber surface, but it is important that at least 20% of the fiber surface is covered. In that case, it is advantageous to use a material that has excellent adhesion or adhesion to the core component. In the case of the present invention, those in which the core component is polyester and have ester bonds are preferable. Another advantage is that sufficient stability of false twisting can be obtained. The main factor responsible for false twisting stability is the core component, and it is not uncommon for the amount ratio to severely impair this component. In the case of the present invention, the component ratio (low melting point component/core component) that has the above-mentioned adhesion is 0.1 to . It was found that i,2 is appropriate.

FIG. 3 is a schematic diagram showing the side surface of the yarn according to the present invention.

A indicates the length of Lp and Id at the stuck part. The stuck portion is generally thicker than the non-stick portion, has a twist in the false twisting heating direction, and has a shape similar to twisting and winding. B is the non-stick part and LB is its length? show. The non-stick part is generally thinner than the stuck part, and the
It has a shape in which the twists of the curly yarn are concentrated in the false twisting and untwisting directions.

In the non-stick area, there is something floating from the yarn surface (loop IR
There are also fibers (fibres) and curls (curl fibers). One of the reasons for this is that the fibers are twisted in the opposite direction to the false twist set and have a large strain. As a relaxation phenomenon, loop-
Form curls. Another reason is that the present invention uses partially drawn yarn. Partial stretching naturally includes unstretched, stretched, and intermediate stretching. In intermediate drawing, there are drawing differences and molecular orientation differences between the fibers m. When this is subjected to false twisting, fibers with high elongation or low molecular orientation tend to be located on the outside, resulting in a difference in length (yarn length difference) between the fibers. False twist strain and twist strain are added to this to form loops and curls. This is because the alternating twists in the false-twisting heating direction and the untwisting direction tend to set the false twist in the stuck part and leave heating, and the twisting in the opposite direction on the same side as this is induced in the non-stick part.

Further, the characteristics and requirements of the present invention will be explained. In the present invention, LA and LB are not constant but balanced. Variation itself is a good thing because there is a change in length, but
The present invention also aims to change the twist. As mentioned earlier, the mutual twists that occur during false twisting originally have the property of canceling each other out and becoming "zero", and the LA and LB have the same amount of twist. Therefore, by varying LA and LB, the number of twists (twists per unit length) of each individual is different.

As a result, subtle changes in twist size and dynamics, which are the object of the present invention, can be obtained. i yb LAALL
As a result of careful consideration of the B length ratio (LB/LA), we found that it does not have to be 1:1, and that it would be more natural if it were shifted to either side, rather than creating oddly overlapping patterns on the weave. It has a unique appearance. In the present invention, it is more natural for LB to be long. However, if LB is extremely long, the number of twists on 11i Lm decreases and the twist texture deteriorates, which is disadvantageous. It is clear that the range that provides both the twisted texture and natural appearance is LB/LA=1 to 7. Further, as a result of careful consideration of the length of LA%Ln, a fiber length of approximately 20 to 500 mm, which constitutes the spun yarn, generally exhibits a natural appearance. It is desirable that at least one of them be in this area. In the yarn of the present invention, the length gLA of the stuck part is 20 to 25 when combined with the above results.
Advantageously, it is 0U.

Next, the relationship between the thickness of the stuck portion and the non-stick portion will be explained. hZ
The thickness of the stuck part is an important visual factor, along with the form and length of the stuck part and non-stick part mentioned above. Thickness is also a texture and mechanical component of woven or knitted fabrics. The present invention is a complex combination of these factors. If we discuss only the thickness, extreme changes in thickness may provide visual interest, but they also give an unnatural feel and are extremely hard in some areas. The intention of the present invention is to achieve appropriate strength and weakness within a natural appearance. As a result of our intensive efforts in the field of stiffness, we were able to achieve a natural texture and texture with a thickness ratio of approximately 1.1 to 2.3. Thought to share.

Next, the yarn manufacturing method of the present invention will be explained.

FIG. 4 is a schematic diagram of an apparatus for producing partially drawn yarn prior to false twisting. R+ is a supply roller, G is a guide, R3 is a delivery roller, L is a distance between the guide and delivery roller (partial stretching distance), 3 is an undrawn low-drawn yarn. ○Undrawn yarn is:
4 changes to the delivery roller via the supply roller and guide.

The stretching is carried out within a partial stretching distance, and the speed ratio of R1 and R2 (
Partially drawn yarn is obtained when R2/R+) is set to be equal to or less than the natural draw ratio (ND) of the undrawn yarn, that is, 1 (R2/R+)(ND).

At this time, the larger the partial stretching distance, the more 'LrA, L
12 is easy to obtain, and the speed ratio (R・/R1
), it is easy to get something as big as 8/L8. Further, the larger the natural draw ratio (ND), the easier it is to obtain a thinner thickness ratio (fineness of the stuck part/fineness of the non-stick part).

Incidentally, R1 may be a heating roller, or a heater may be provided between partial stretching. In that case, the temperature is lower than in the case of normal stretching, and the intermediate portion between unstretched and stretched increases.

FIG. 5 is a schematic diagram showing a false twisting device. R3 is a supply roller, H+ is a heater, S is a false twisting unit, R3 is a delivery roller, and 4 is a partially drawn yarn. Nobeoki (including simultaneous false twisting) is processed. In order to stably obtain the yarn of the present invention, the conditions are different from those for obtaining ordinary bulky textured yarn. The first
is the speed ratio relationship between R3 and R4. The yarn of the present invention has twist shrinkage unlike bulky yarn. Therefore, this twist must be given to the yarn (R3 and R4 need to be considered and devised. Generally speaking, the limit speed ratio (Rs / R4) at which the yarn does not break)
The larger the value, the easier it is to generate alternately twisted adhesive yarns. Specifically, when the speed ratio used in the bulky yarn is γ, (R3/R4)=(1.04 to 1.34″lγ).

Here, the above formula can be applied even if (R2/R+) is small in the previous partial stretching step and stretching is involved in false twisting.

Even if the number of false twists used in ordinary bulky textured yarns is applied, an alternately twisted adhesive yarn can be obtained, but the stability of false twisting is low.

In the case of alternately twisted twisted yarns, there is a stable false twisting range below the false law number of bulky textured yarns. Specifically, the number of false twists (T) is T = (1600 to 2450) (150/D, t/m, where D is the fineness after processing (including twist shrinkage)
・The false-twisting unit can be a commonly used unit, but there is a difference in false-twisting stability. In descending order of superiority, they are: belt type, friction type, and spindle type. Continuing from FIG. 5, a commonly used two-stage heater set (second heater and second delivery roller) (not shown) may be added.

Regarding the relationship between the low melting point component and the core component, a difference in melting point is necessary in order to easily ensure sufficient adhesion and stability in false twisting, and in order to stably obtain the yarn of the present invention, A difference of at least 0.degree. C. is required, more preferably at least 20.degree. In addition, the temperature of heater H1 is such that the melting point of the low melting point component is (m, p
, ]8, (m, p, :]3-40〈Hl(
℃)gCm,p,) is preferably in the range of 3-15, (m, l), ], -31-1'HI('C)/
m, l), ]3-20 is more preferable.

The yarn of the present invention can be used to remove low-melting point components after weaving and knitting to break up stickiness in woven or knitted fabrics and make them flexible, but depending on the use and preference, yarns of 80 or more threads may be excluded. 0 (Example) Next, the present invention will be further explained with reference to Examples and Comparative Examples.

Table 1 summarizes these.

The partially drawn yarn was manufactured using the apparatus shown in FIG. 4, and the false twisting was performed using the apparatus shown in FIG. 5, equipped with a two-stage heater set (second heater: Hl, second delivery roller: Ra) (not shown). . No sizing was used. Caustic weight loss is 1N NaOH9
An 8°C aqueous solution was used.

The composition of the composite fiber is as follows.

Cross section: Round (shape as shown in Figure 1) Core component: Polyethylene terephthalate component Ratio:
(Low melting point component/core component) -0,4 In Example 1, composite fiber was spun at 3300 n/min and wound (ND=1.49
) partially stretched. The length of the stuck part of the yarn obtained by false twisting is about 25 to 65 mm, and the length of the non-stick part is about 50 to 65 mm.
130 us fineness ratio (glue part fineness/glue part fineness) is approximately 1
．． It was in the range of 3 to 1.5. The yarn had looped floating fibers in the non-stick portion. When the caustic weight loss was 32%, the stiff feeling due to agglutination disappeared, and no low-melting point components were found under microscopic examination.

Comparative Example 1 is a crimped yarn using the same yarn as Example 1, with no alternating twist at all. Comparative Example 2 is an example using undrawn polyethylene terephthalate yarn, and the yarn take-up is 330.
It is intended to be wound at 0m/m (ND=1.50).

In this case as well, an alternately twisted adhesive yarn was obtained as in Example 1, but the adhesiveness could not be broken by caustic reduction, resulting in a hard fabric.

Margin 17 (Effects of the Invention) The yarn of the present invention can impart excellent flexibility to a woven or knitted fabric by removing low melting point components after making it into a woven or knitted fabric. Moreover, loops and curls are formed in an attempt to alleviate distortion during the process of unsticking from the weaving knitting,
Significant deformation space increases. Furthermore, since the alternating twists can be tightly held in the woven or knitted fabric, it is possible to create a filament woven or knitted fabric with excellent twisted texture and expression. Further, in the present invention, a twisted texture can be obtained by omitting the yarn twisting step by alternating twisting, and fiber production can be achieved by omitting the sizing step by using the yarn convergence and adhesion effect by alternating twisting.

[Brief explanation of the drawing]

FIGS. 1 and 2 are schematic diagrams showing cross sections of composite fibers used in the present invention. 1 is a core component made of polyester,
2 indicates a low melting point component. FIG. 3 is a schematic diagram showing a side view of the yarn of the present invention. A is stuck area, B is non-stick area, LA
, R8 indicates the respective lengths. FIG. 4 is a schematic diagram showing a partial stretching device. 3 is an undrawn yarn, R+ is a supply roller, G is a guide, I (2 is a delivery roller, and L is the distance between the guide and delivery roller.
4 is a schematic diagram showing an apparatus (including stretching and simultaneous false twisting), 4 is a partially drawn yarn, R2 is a supply roller, H1 is a heater, S is a false twisting unit, and R4 is a delivery roller.

Claims (1)

[Scope of Claims] 1. Polyester is used as a core component, and a low melting point component that is more soluble or more easily degradable, or both, occupies 20% or more of the fiber surface, and the low melting point component and the core component The component ratio (low melting point component/core component) is 0.1 to 1.2
and is an alternately twisted adhesive yarn formed by false-twisting or simultaneous stretching and false-twisting using partially drawn composite fibers, the fineness ratio of the adhesive part to the non-agglutinated part (fineness of adhesive part/non-agglutinated part). Alternately twisted adhesive yarn 2 characterized by having a fineness) of 1.1 to 2.3, the average length of the adhesive part being 20 to 250 mm,
Claim 1, characterized in that the length ratio of the non-stick part to the stuck part (non-stick part length/stick part length) is 1 to 7.
Alternately twisted adhesive yarn described in section