JPS5915530A - Polyester spun yarn - Google Patents

Abstract

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

Description

[Detailed description of the invention] This relates to spun yarn that gives a linen texture.

Generally speaking, it is well known that fibers with a high melting point are mixed with fibers with a low melting point and heat treated to melt the low melting point fibers to produce a spun yarn with a linen-like texture, and many proposals have been made in the past. ing.

For example, two or more types of thermoplastic synthetic fibers having different melting temperatures are fused while being twisted (Japanese Patent Publication No. 46-145
No. 86), while drawing two or more types of fibers with different melting points, some fibers are heated and fused using a hot plate (Japanese Patent Application Laid-Open No. 52-9
No. 6254), untwisted spun yarn with a blending rate of low melting point components of 3 to 15% by weight and a fusion rate of 0.4 to 0.02% by weight
(Japanese Patent Application Laid-open No. 1983-4000).

Strainless spun yarn in which a fiber bundle containing low melting point fibers is subjected to false twist heat treatment and the low melting point fibers are fused (Japanese Patent Application Laid-Open No. 48-9052)
, containing 5 to 20% by weight of low melting point fibers.

Oven-end spun yarn with high melting point fibers (
JP-A No. 54-3444), when several spun yarns are combined, a low-melting point synthetic filament or spun yarn is placed in the center and heat-treated to bond them together on the inner surface in contact with the core yarn (
JP-A No. 55-158340), heat-resistant synthetic fibers and fibers with a melting point lower than that by 50'C are used in combinations of 10 to 2
There is a method in which a cloth made of threads mixed with 0% is heat-treated and bonded (Japanese Patent Application Laid-Open No. 54-69202). However, in these conventional technologies, the strength of the low-melting point fibers themselves is weak, resulting in significant damage to the fibers during the spinning process, and fiber waste is transferred to the carding machine and
Occurs in spinning machines.

In addition, since it lacks adhesive strength as a binder, the strength of the spun yarn is low, and the unique texture of linen is strong against repeated bending. was not obtained.

The present inventors conducted a loading study to solve the drawbacks of the prior art, and found that by using a core-sheath type low-melting point composite polyester fiber, the adhesive force was improved E2 and the strength was increased, and the woven or knitted fabric after heat treatment was improved. The present inventors have discovered that a spun yarn that provides an excellent linen-like texture can be obtained, and have completed the present invention.

That is, the present invention is a mixed spun yarn consisting of two types of polyester fibers (A) and (B), in which the fibers are polynisder fibers having a normal melting point. , ffl fiber (B) consists of a polyester component with a normal melting point in the core and a melting point of 150 to 2 in the sheath.
Core 1 composed of 00C low melting point polyester component
(This is a polyester spun yarn that is a former type composite polyester fiber and is characterized in that the mixed side combination of R fibers (B) is 10 to 90i and Mt.

In the present invention, the polyester with a normal melting point mainly refers to polyethylene terephthalate, but it also includes polyesters with a slight copolymerization of terephthalic acid and ethylene glycol with a melting point of 220°C or higher. .

Also, low melting point polyester and V, one or two dibasic acids or their derivatives fVI! Above and glycol 1
It refers to a polyester copolymerized with a species or 2flf1 or more.

Namely, terephthalic acid as an example of a dibasic acid.

Isophthalic acid, phthalic acid, p-oxybenzoacetic acid.

Aromatic dibasic acids such as 5-sodium sulfoiphthalic acid and naphthalene dicarboxylic acid, and oxalic acid.

Examples include alicyclic dibasic acids such as adipic acid, sepacic acid, azelaic acid, and dodecanedicarboxylic acid. On the other hand, examples of glycols include ethylene glycol, diethylene glycol, triethylene glycol, probidiol, butanediol, bentanediol, hexanediol, neopentyl glycol tp-xylylene glycol, and the like. A preferred example of a combination of these dibasic acids and glycols is as follows.

The glycol component uses ethylene glycol of 85 mol or more, diethylene glycol of 15 mol or more,
A copolymerized polyester consisting of a combination of 70 to 90 moles of terephthalic acid and one to three types of dibasic acids selected from phthalic acid, isophthalic acid, and adipic acid as the dinaric acid component is suitable. .

As mentioned above, spun yarns made by mixing ordinary polyester fibers with low-melting polyester fibers, or woven or knitted fabrics obtained from the same, can be heat-treated to melt the low-melting components, thereby giving a linen-like texture.

It is made by melting low melting point polyester fibers and bonding ordinary polyester fibers together to give the yarn elasticity and bending at 1'
This is because it lowers fM I'IE and at the same time disturbs the parallelism of the yarn surface, giving it a crisp and cool feel similar to linen knitted fabric. However, molten polyester is inherently very rigid, and the adhesive tends to come off due to repeated bending, making it difficult to maintain the above-mentioned tension.

On the other hand, since the polyester spun yarn of the present invention is a mixture of core-sheath type low melting point cotton, firstly, the adhesive surface is large;
Second, the rigidity of the melted zone is relaxed.

12 It maintains the linen-like performance with a sharp feel and a cool feeling even after repeated bending, and thirdly, the polyester component in the core increases the strength of the spun yarn, making it extremely spun. The yarn has high strength and maintains the robustness of linen's unique texture even after repeated bending.

It is a spun yarn with an excellent hemp texture.

Core-sheath type composite polyester fiber C of the fiber (B) used in the polyester spun yarn of the present invention: [The ratio of the low melting point polyester component arranged in the sheath part is 40 to 60% of the total
Section I is appropriate. When the proportion of low melting point polyester in the sheath is 401 or less, the adhesion to the polyester fibers usually decreases, the elasticity and bending recovery of the spun yarn do not decrease, and the degree to which the parallelism of the yarn surface is disturbed becomes weaker. Spun yarn with linen-like texture cannot be obtained. Furthermore, if the low melting point component exceeds 60% by weight, the proportion of the polyester component in the core decreases, which is undesirable because the strength utilization factor contributing to the spun yarn decreases.

The core-sheath type polyester fiber must have a melting point of 150 to 200°C. If the melting point is below 1500, the sieve texture will be significantly lost due to heating during dyeing, etc.
When 1α exceeds 200c, the strength of the polyester fiber decreases by 11i47% when melted by heat treatment.

Impairs the performance of polyester fibers.

Father 2 Fibers constituting the polyester spun yarn of the present invention (13
) core-sheath type polyester fibers have a mixing ratio of 10 to 10% of the total.
It can be used within the range of 90%, but preferably 20 to 70%. Mixing ratio is 101t
% or less, adhesion to fiber (5), that is, normal polyester fiber, will not be sufficient.

It will be 1'd away from the Asa-like wind ridge. Conversely, if it exceeds 90% by weight.

The spun yarn becomes too hard, the yarn becomes brittle, and the strength and other properties of polyester fibers cannot be utilized.

The heat treatment for imparting a sieve texture to the polyester spun yarn and woven or knitted fabric obtained from the polyester spun yarn of the present invention is carried out at a temperature higher than the temperature at which the low melting point polyester component of the core-sheath type polyester fiber melts. It may be carried out at an appropriate temperature within the range of melting temperature or lower.

The polyester spun yarn of the present invention uses a core-sheath type composite polyester fiber as the low-melting point cotton.

It is possible to increase the mixing ratio to 90:191:%.

At the same time, the generation of fiber waste (white powder) in card machines and treetop spinning, which had problems in the spinning process, was eliminated, and at the same time L (the strength and adhesion of the spun yarn could be improved, resulting in a stable, high-quality sieving machine) A spun yarn having a texture can be obtained.

Hereinafter, explanation will be given according to examples.

Example 1 Terephthalic acid and inphthalic acid were copolymerized in a conventional manner with different blending ratios to obtain chips with different characteristics (melting points) as shown in Table 1. Of these chips.

A special core-sheath type spinning device is used, in which chips with a low melting point are placed in the sheath part and chips with a normal melting point are placed in the core part at a ratio of 1:1.
Spinning speed 1000 m/71.
Spun under the conditions of discharge 11490#7.6+ and single yarn fineness 1
A 5 d undrawn yarn tow was obtained. The undrawn core yarns are bundled so that the toe denier after drawing is 100,000 deniers, and drawn using a normal method at a drawing temperature of 70C and a drawing ratio of 3.50 times to obtain a core-sheath type composite polyester cotton with a fineness of 4d. [Fiber Q3)] was obtained.

This cotton is usually made of polyester fiber (40% elongation, brand 2d)
x51mm) and cotton in a 1:1 ratio using a cotton mixing machine,
A 20'S spun yarn was obtained through carding, filament, roving and spinning. The spun yarn was woven under the following weaving conditions: 103 warps/inch, 87 wefts/inch, and a width of 93α, and was heat-treated to examine the texture. In addition, the single yarn tenacity of the spun yarn was measured after heat treatment in its entire state. The results are shown in Table 1.

0°Good hemp-like texture
], and the mixing ratio was varied from 5 to 95% by weight, and the 20's spun yarn was made into a fabric under the same conditions as in Example 1, and the texture and single yarn strength after heat treatment were evaluated. was measured. The results are shown in Table 2.

Example 3 Using the low melting point copolymerized polyester chips obtained in Example 1, the discharge amounts of the low melting point polymer and the normal polymer were varied using a gabong in a composite spinning device, and the low melting point polymer of the sheath Rf (30 Strain to ~70% by weight and spin, stretch, spin, and weave under the same conditions as Example 1.
/! (I did a lot of research to find out the texture.
'y Shown in Table 3.

Table 3 (-), Linen I"II: Good fit x: Linen texture poor (as is clear from the results of Examples 1 and 2.3).

This spun yarn (1) has high tenacity and has a negative effect on textiles after heat treatment.It was able to provide texture.

! 1 yen Applicant: Nihon Ester Co., Ltd. Agent
Yuzo Tama

Claims (1)

[Claims] (5), (B) A mixed spun yarn consisting of two types of polyester fibers, where fiber (4) is a polyester fiber with a normal melting point, and fiber (B) is a core polyester component with a normal melting point and a sheath. It is a core-sheath type composite polyester fiber composed of a low melting point polyester component with a melting point of 150 to 200 ° C., and the mixing ratio of fiber (B) is 10 to 907 fju.
% polyester spun yarn.