JPS5843494B2 - Munoritsu Kisenshi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a yarn that can be woven into warp yarns using a size-free fibrous yarn, and more specifically to a size-free fibrous yarn that is made by heat-sealing a composite multifilament made of polyester and polyethylene. It is.

When weaving multifilament as warp yarn, it is subjected to considerable tension, impact, and friction during movements such as winding, shedding, and beating during weaving, so it must be strong enough to withstand this.

For this purpose, conventional sizing is performed to create a colloid in the gaps between the single fibers using a sizing agent to eliminate slippage between the fibers and increase the strength of the yarn, or additional twisting of 150 to 500 T/m is performed, or the filament is twisted in turbulent air. By applying a non-bulky interlacing process to the fabric, it was given mechanical performance that could withstand weaving.

However, in the case of sizing, a sizing agent of 5 to 15% of the fiber is required, and since the sizing agent concentration is 5 to 20%, drying after applying the sizing agent is complicated, and a normal sizing machine is We have a very large dryer.

In addition, the glue for water jet looms, which has recently become rapidly popular, requires water resistance in addition to regular glue, and acrylic ester-based glues and ammonium salt-based glues are being used. However, with improved water resistance, if heat setting is performed in the gray state, it will be difficult to remove the size, which will cause problems in de-sizing.

It is also possible to weave without sizing by additional twisting or interlacing, but this requires a process and results in a product with a different texture.

The present invention does not require sizing, additional twisting, or special interlacing processing, and is a sizing-free yarn that does not cause problems such as fuzz during weaving even when used as a warp yarn. Tie threads are particularly effective when used on water jet looms.

In other words, the warp threads used in water-jet looms require a special water-resistant sizing agent, which makes it difficult to remove the size. If left for a long period of time, mold may form on the glue and cause various problems.

The non-sizing yarn of the present invention does not require a sizing agent, so there is no need for drying after sizing, and it can also be used as is on water jet looms, which eliminates problems such as mold growth that conventionally caused druffles. Not at all.

Furthermore, since the non-sizing yarn of the present invention has a significantly greater degree of cohesion than ordinary sizing yarn, there are no problems such as fluffing during weaving.

In addition, although sizing yarn has improved strength, it has decreased elongation, which could not withstand tension and impact and caused yarn breakage, but the non-sizing woven yarn of the present invention has a good elongation retention rate. be.

The present invention uses a structure of conventionally known composite fibers, the polymer components are polyethylene and polyester, the polyethylene surrounds the polyester, a large number of these fibers are doubled, the polyethylene is softened and fused, and the polyethylene This is a non-sizing yarn made by using polyester as if it were a sizing agent.

Here, in the composite fiber made of polyethylene and polyester of the present invention in which polyethylene surrounds polyester, the composite ratio of polyethylene to polyester is 0.1 to 0.6 volume ratio, and the volume ratio of polyethylene to polyester is 6 to 5.
The present invention relates to a sizeless fibrous yarn characterized in that 0 yarns are fused with polyethylene.

The polyester (hereinafter abbreviated as PES) referred to in the present invention refers to aromatic dicarboxylic acids such as terephthalic acid and isophthalic-2,6-dicarboxylic acid, aliphatic dicarboxylic acids such as phthalic acid, adipic acid, and sebacic acid, or esters thereof. and ethylene glycol, diethylene glycol, 1,4-butanediol, neopentyl glycol,
It is a polyester synthesized from a diol compound such as cyclohexane-1,4-dimetatool, and particularly preferred is a polyester in which 80% or more of the repeating units are polyethylene terephthalate.

Alternatively, the above polyester component may be copolymerized with polyalkylene glycol glycerin, pentaerythritol, methoxypolyalkylene glycol, bisphenol A1 sulfoisophthalic acid, or the like.

Furthermore, polyesters synthesized by self-condensation of oxycarboxylic acids and polyesters in which 70% or more of repeating structural units are oxycarboxylic acid polymers can also be used.

The polyethylene (hereinafter abbreviated as PE) mentioned in the present invention can be manufactured by a high pressure method, a medium pressure method, or a low pressure method.
5 f/cr/l and is preferably produced by a high pressure method.

More preferably, melt index (MI)=10
~70.

Polyethylene manufactured by medium pressure method or low pressure method has a softening point,
It has a high melting point, making it difficult to fuse.

The composite ratio of the composite fiber of the present invention is the volume ratio of polyethylene to polyester, and actually the cross-sectional area ratio of the fiber cross section (hereinafter abbreviated as SR) SR = (cross-sectional area of PE part) / (
The cross-sectional area of the PES section).

The composite fiber of the present invention can be obtained by a conventionally known joining type spinning method, a core-sheath type composite spinning method, or by joining and dividing an alternating multilayer polymer stream and then discharging it from a nozzle.

The composite single yarn of the present invention refers to the smallest unit of composite fibers, and examples thereof include those shown in FIGS. 1 to 19.

In the bonded type fibers shown in FIGS. 1 to 9, the shaded portion 1 is polyethylene, and the other portion 2 is polyester.

The core-sheath type composite or multilayer joint split type fibers shown in FIGS. 10 to 19 must have a structure in which polyethylene is arranged in the outer circumferential part 1 shown by diagonal lines and polyester is arranged in the middle part 2.

In the present invention, the minimum unit fiber of PES after removing PE is, for example, the part 2 shown in Figures 1, 8, and 13, etc., and the preferable number of minimum unit of PES is 4 or less. , the average denier is 0.5 to 1.5.

The number of composite single filaments is about 6 to 50, and if it is less than 6, the absolute strength of the multifilament is insufficient, resulting in poor stretchability and weavability. This is not preferable because the yarn becomes fused in a shape.

The non-sizing yarn obtained in the present invention has single yarns fused together with polyethylene and has extremely excellent binding properties.

The thread binding degree (H) of the present invention can be expressed by the binding property shown below.

20 sample fibers are applied to a TM type resultant force tester with a load of 180
Friction is performed at f/20 threads, and the number of threads unraveled every 10 times (fi
) and find out the number of frictions (i=10.20.30...
・) is the value obtained from the following formula.

(However, if 1 = 100 and the number of unraveled books is less than 20, H
was 100 or more.

) The conjugation dust of ordinary sizing yarns is 30 or less, but the fused yarn of the present invention has a conjugation dust of 60 or more, and its conjugation is extremely excellent, and there is no problem such as fuzz during weaving.

In addition, ordinary sizing yarns have improved strength but lower elongation, which may result in yarn breakage due to their inability to withstand tension and impact, but the yarn of the present invention has a good elongation retention rate, so there is almost no breakage. .

Further, the fusion referred to in the present invention may be a light fusion as shown in FIG. 20, or a fusion that integrates multifilaments as shown in FIG.

It can be seen that the non-sizing yarn of the present invention has a degree of conjugation of 60 or more, and has excellent weavability compared to the degree of conjugation of ordinary sizing yarns of 30 or less.

The non-sizing fibrous yarn of the present invention can be obtained by applying heat equal to or higher than the softening point of polyethylene when stretching the multifilament obtained by the above-described composite spinning method 2 to 6 times.

Alternatively, it can be obtained by applying heat above the softening point under tension after stretching.

The non-sizing yarn of the present invention has many advantages as a warp yarn for weaving as described above, and after weaving, it is soaked or showered in a polyethylene solvent such as perchlorethylene, trichlorethylene, toluene, etc. By processing, polyethylene as a sizing agent is extracted and a woven fabric made of polyester multifilaments is produced. Therefore, it is now possible to provide a woven fabric made of ultra-fine denier fibers or a woven fabric made of multifilament with a small denier, which has been considered extremely difficult in the past. It becomes possible.

The present invention will be explained below with reference to Examples.

Example 1 ■ (Intrinsic viscosity measured with an Upperohde viscometer in a constant temperature bath at 30°C using a mixed solvent of equal amounts of phenol and tetrachloroethane) is 0.60 dll? of polyethylene terephthalate and the density is 0.92? /crd (25℃)
The fiber has a cross section as shown in Figure 2 of SR-〇,4 made of polyethylene, and the denier of the polyethylene terephthalate portion is 1. A composite drawn yarn of 36 filaments with Odr was obtained.

The stretching ratio was 3.75 times and the stretching speed was 1000 m/wister, but there was almost no fuzz or yarn breakage during stretching.

This composite drawn yarn was heated at 180°C under the tension of IOS'/yarn.
A non-sizing woven yarn with H=100 or more was obtained by passing the yarn through a non-contact hot air oven such that the yarn temperature at the outlet was 125°C.

This thread is warped and drawn as a warp thread, and then used as a weft thread on a long fiber loom using ordinary polyethylene terephthalate fiber (7
5dr/36f) to obtain a taffeta fabric.

There were no problems during warping or drawing, and there were no problems such as fuzz or single thread breakage during weaving.

When the obtained taffeta fabric was immersed in perchloren at 60°C, the polyethylene was easily extracted.

The extracted fabric was coated with Eastman Polyester R
When it was dyed with ed B (3% owf, 130°C dyeing), it had a good silk-like texture without any of the warp lines, which have traditionally been a problem with taffeta fabrics.

Comparative example 1 (V) -0.60dl/? An attempt was made to obtain a 36 dr/36 f yarn by spinning and drawing polyethylene terephthalate.

It was very difficult to apply the stretched yarn, and although various stretching conditions were investigated, fluff and single yarns were frequently produced during stretching.

The drawing speed was reduced to 200 m/-, and the fluff up to 1500 f was passed three times to obtain a drawn yarn (pass rate was 42%).

A sizing agent consisting of PVA, an acrylic acid ester copolymer, and a nonionic activator was attached to this drawn yarn to obtain a sizing yarn.

The physical properties of this sizing yarn are shown in Table 1 in comparison with those of Example 1.

The conjugation degree of the sizing yarn of Comparative Example 1 is 15, whereas the degree of conjugation of the non-sizing yarn of the present invention is 100 or more (actually, the number of yarns unraveled by 100 frictions is 4), which is extremely good.

Although there is not much difference in strength retention rate, the elongation retention rate is 93% for the sizing yarn, while the present invention is good at 101%.

When an attempt was made to weave taffeta using this sizing yarn in the same manner as in Example 1, single yarn breakage occurred frequently.

Example 2 From polyethylene (polyethylene terephthalate with i = 0.62 and density of 0.919?/CtdC25°C), 5R = 0.2 and the denier of the portion C in the cross-sectional shape of Fig. 13 is 0.7. A fused yarn consisting of 12 filaments was made from the composite yarn.

This fusible yarn had H>100 (no fuzz after 100 rubs).

Taffeta was woven from this warp yarn using a water jet loom loom that sprayed Q, 5 cc of water into the shed for each pick.

There were no problems during weaving, and since polyethylene is hydrophobic, the woven fabric had a low moisture content and was easy to transport.

[Brief explanation of the drawing]

Figures 1 to 19 are schematic diagrams showing cross sections of examples of composite fiber single yarns used in the present invention, and Figures 20 and 21 are schematic diagrams showing cross sections of examples of non-sizing woven yarns of the present invention. FIG.

Claims (1)

[Claims] Density at 125℃ is 0.910-0.925? /c
6 to 50 of composite fibers having a structure in which high-pressure polyethylene of f1 surrounds polyester, and the composite ratio of polyethylene to polyester is O11 to 0.6 volume ratio.
A non-sizing woven yarn characterized in that the book is made of softened and melted polyethylene or fused to the composite fiber.