JP2001131820A - Method for applying spinning oil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for applying a spinning oil by which filaments are cooled and the generation of latent heat in a housing container is prevented without causing melt sticking when applying the spinning oil to the undrawn filaments comprising a specific polyester having a low glass transition point. SOLUTION: This method for applying the spinning oil comprises applying the spinning oil at <=20 deg.C while dropping the spinning oil onto an oiling roller when spinning conjugate filaments of a core-sheath structure comprising a core component which is a polyalkylene terephthalate having >=220 deg.C melting point and a sheath component that is a crystalline copolyester composed of a terephthalic acid component, an ethylene glycol component, an aliphatic lactone component and a 1,4-butanediol component and having 20-50 deg.C glass transition point and 130-180 deg.C melting point, cooling and solidifying the extruded filaments, then applying the spinning oil to the cooled and solidified filaments with the oiling roller, bundling the plural filaments, providing an undrawn tow and housing the resultant undrawn tow in a housing container.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stably applying an oil agent to a spun undrawn yarn.

[0002]

2. Description of the Related Art When producing short fibers of synthetic fibers such as polyester, an oil agent is applied to a spun yarn in order to improve bunching and antistatic properties in a subsequent drawing step. ing. Generally, a method using an oiling roller is used to apply an oil agent. As shown in FIG. 2, the oiling roller forms an oil film on the roller surface while immersing a part of the oiling roller in an oil bath and rotating the oil roller to apply the oil agent to the yarn.

However, such a method of applying an oil agent may cause the following problem in the case of an undrawn yarn bundle using a specific copolymerized polyester having a low glass transition point as a sheath component. That is, the copolyester of the sheath component may not be completely cooled due to the low glass transition point thereof, and may be cooled to a temperature lower than the glass transition point and stored in the storage container after the oil agent is applied. After storage due to latent heat, the yarn temperature rises to near the glass transition point, fibers tend to fuse (adhere), and turbulence and entanglement frequently occur when pulled out from the yarn storage container. Cause. In addition, the obtained product also has fusion or poor quality.

[0004] In order to solve these problems, the temperature of the oil agent in the oil agent bath is lowered, an oil agent having a temperature of 20 ° C or less is applied to the undrawn yarn bundle, and latent heat of the yarn bundle after storage is generated. And cooling the storage container chamber itself. However, in the former method, the maximum amount of oil that can be attached to the yarn with the current oiling roller is 30% by weight.
And it was not possible to give a sufficient cooling effect to the inside of the fiber. On the other hand, in the latter method, it was difficult to cool the inside of the storage container, that is, the undrawn yarn bundle near the bottom of the storage container.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, and provides a large amount of low-temperature oil when applying the oil to an undrawn yarn bundle made of a specific polyester having a low glass transition point. It is an object of the present invention to provide a method of applying an oil agent that sufficiently cools a yarn bundle by applying the same, prevents generation of latent heat in a storage container, and does not cause fusion. .

[0006]

Means for Solving the Problems The present inventors have made intensive studies to solve the above problems, and as a result, have reached the present invention.
That is, in the present invention, the core component is a polyalkylene terephthalate having a melting point of 220 ° C. or higher, the sheath component is a terephthalic acid component,
Ethylene glycol component, aliphatic lactone component and 1,4
-Consisting of butanediol component, glass transition point 20-50
° C, spinning a core-sheath composite fiber that is a crystalline copolyester with a melting point of 130-180 ° C, after cooling and solidifying,
An oil agent is applied by an oiling roller, and a plurality of oil bundles are bundled into an undrawn yarn bundle and stored in a storage container. The oil agent is applied at a temperature of 20 ° C. or less while dropping the oil agent on the oiling roller. The gist of the method is that of providing.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic diagram showing one embodiment of an oiling roller used in the present invention, and FIG. 2 is a schematic diagram of a conventional oiling roller. The undrawn yarn to which the method of the present invention is applied has a core component of a polyalkylene terephthalate having a melting point of 220 ° C. or higher, a sheath component of a terephthalic acid component, an ethylene glycol component, an aliphatic lactone component, and 1,4- It is composed of a butanediol component, and has a glass transition point of the sheath component of 20 to 50.
It is a conjugate fiber having a core-sheath structure made of a crystalline copolyester having a melting point of 130 to 180 ° C.

Polyalkylene terephthalate as a core component
As a specific example of the polyethylene terephthalate (P
ET) and polybutylene terephthalate are preferred.

The aliphatic lactone which is one of the copolymer components of the sheath component is preferably a lactone having 4 to 10 carbon atoms.
Particularly, ε-caprolactone and δ-valerolactone are preferred.

Further, as long as the effects of the method of the present invention are not impaired for both the core component and the sheath component, dicarboxylic acids such as isophthalic acid, 5-sodium sulfoisophthalic acid, phthalic anhydride, adipic acid and sebacic acid are used. Ingredients, plus 1,6-
A diol component such as hexadiol or cyclohexanedimethanol may be contained as a copolymer component.

In the present invention, after the melt-spun yarn is cooled, an oil agent is applied to the yarn with an oiling roller, and the unstretched yarn of a plurality of weights is bundled to form a gear-type nip roller or air fluid. Picked up by the suction device used,
Store in storage container. At this time, the amount of oil that can be applied to the undrawn yarn varies depending on the number of rotations of the oiling roller, the width of the yarn on the oiling roller, the discharge amount, the spinning speed, etc. If an oiling roller is used, the limit is approximately 30% by weight.

Therefore, in the present invention, as shown in FIG.
By applying an oil agent at a temperature of not more than 0 ° C., the oil agent 3 dripped in addition to the oil agent 5 in the oil agent bath 4 forms an oil film on the surface of the oiling roller 1. The cooling efficiency can be improved.

That is, there is a limit to the amount of an oil film to be formed by lifting an oil agent with an oiling roller. Therefore, by dropping the oil on the roller, a thicker film than usual can be formed, exceeding this limit, and it is possible to increase the amount of oil applied and improve the cooling efficiency.

Therefore, according to the present invention, it is possible to adhere up to about 40% by weight, and in the present invention, the amount of adhesion to the yarn is preferably 30 to 38% by weight.

It is necessary that the temperature of the oil agent applied to the yarn Y is 20 ° C. or less, and at least the oil agent to be dropped is 20 ° C. or lower. The temperature of the oil in the oil bath 4 is also preferably 20 ° C. or less. However, the oil film on the roller surface is cooled by the dripped oil and the oil in the oil bath 4 becomes 20 ° C.
C. may be exceeded.

Since the yarn bundle accommodated in the present invention uses the above-mentioned polymer having a low glass transition point as a sheath component, it is not sufficiently cooled only by applying an oil agent at about room temperature, and fibers are not cooled. Will cause fusion. Therefore, the yarn is sufficiently cooled by applying a larger amount of the oil agent having a temperature of 20 ° C. or lower than before using the ordinary oiling roller. Thereby, the fusion of the fibers of the undrawn yarn bundle is prevented, and the yarn bundle can be regularly stored in the yarn storage container.

When the temperature of the oil agent exceeds 20 ° C., the cooling becomes insufficient, and the fibers of the yarn bundle stored in the yarn storage container are fused to each other. The lower limit of the temperature is not particularly limited, but is preferably about 3 ° C. in consideration of workability and the like.

Further, the oil agent is preferably a water emulsion oil agent having a concentration of 0.3 to 0.5%. By using the water emulsion oil agent, moisture can be attached to the yarn bundle together with the oil agent, and the undrawn yarn bundle can be stably stored in the yarn storage container.

The method of dropping the oil agent on the oiling roller 1 is not particularly limited, but the oil agent supply device 2 is provided above the oiling roller, and the oil agent is dropped little by little from the supply port. At this time, it is preferable that the droplet is dropped in a direction closer to the yarn Y along the rotation direction of the roller than the vertex of the roller. The drop amount is appropriately adjusted depending on the amount of the oil agent to be attached.

The yarn to which the oil agent has been applied by the method of the present invention is bundled into a yarn bundle and stored in a storage container. The undrawn yarn bundle Y stored has a fineness of 30,000 to 50%. Preferably, the denier is about 100,000 to 3,000,000 (the single-fiber fineness is about 2 to 50 denier). Preferably,

[0021]

Next, the present invention will be described in detail with reference to examples. The measurement and evaluation of various values in the examples were performed by the following methods. (a) Glass transition point (Tg) and melting point (Tm) Measured at a heating rate of 20 ° C./min using a DSC-7 differential scanning calorimeter manufactured by PerkinElmer. (b) Intrinsic viscosity [η] Measured at a temperature of 20 ° C. using an equal mass mixture of phenol and ethane tetrachloride as a solvent. (c) Amount of oil adhering Collect about 1 m of undrawn yarn bundles stored in the storage container,
Left in a dryer at 5 ° C. for 1 hour, before and after drying (weight of undrawn yarn before drying is A, weight of undrawn yarn after drying is B)
Then, the amount of the oil agent adhered was calculated by the equation (1). Amount of oil agent attached (%) = [(AB) / B] x 100 ... (1) (d) Presence or absence of fused yarn Take out the undrawn yarn bundle stored in the storage container,
It was cut into cm, separated, and the presence or absence of the fused yarn was visually determined. (e) Disturbance and entanglement of the yarn bundle The number of turbulences and entanglements when undrawn yarn bundles stored in the yarn storage container (32 pieces) are pulled out to align and draw, The number is shown as the number of times per ton of undrawn yarn bundle weight. (f) Single yarn break Take out 2m of the undrawn yarn bundle stored in the storage container,
The presence or absence of a single yarn break was visually determined.

Production Example 1 To a PET oligomer obtained by an esterification reaction between terephthalic acid and ethylene glycol, ε-caprolactone was added at 18 mol% based on the total acid components, and 1,4-butanediol was used. Polycondensation reaction was performed at a temperature of 260 ° C. and a pressure of 1 hPa for 3 hours to obtain a copolymerized polyester. The resulting copolymerized polyester is
[Η] 0.64, Tm 160 ° C, Tg 33 ° C.

Production Examples 2 and 3 Copolymerized polyesters were obtained in the same manner as in Production Example 1 except that the amount of ε-caprolactone was changed to 10 mol% (Preparation Example 2) and 20 mol% (Preparation Example 3). The copolymerized polyester obtained in Production Example 2 had [η] of 0.62, Tm of 175 ° C and Tg of 49 ° C, and the copolymerized polyester obtained in Production Example 3 had of [η] of 0.65 and Tm of
4 ° C and Tg 28 ° C.

Example 1 Using the copolymerized polyester of Production Example 1 as a sheath component and PET of [η] 0.67 and Tm of 256 ° C. as a core component, the mixture was fed to a core-sheath type composite melt-spinning apparatus. With compound ratio,
Spinning temperature 280 ° C, discharge rate 1000g / min, take-off speed 1050m /
The melt was spun from a spinneret with 640 holes in a minute. After spinning, an oil agent was applied to the cooled yarn at an oiling roller rotation speed of 85 rpm. At this time, the oil agent
A water emulsion oil having a temperature of 13 ° C. and a concentration of 0.3% by weight was dropped at 0.5 liter / minute. The temperature of the oil in the oil bath was 15 ° C. In addition, the width of the yarn on the oiling roller is about 10 cm, and the amount of oil applied to the yarn bundle after storage is 35 weight.
%Met. After oiling, 16 weights were bundled, picked up by a gear-type nip roller, stored in a storage container, and made into an undrawn yarn bundle of about 137,000 denier. After storing about 700 kg of undrawn yarn bundles per 1 yarn storage container, pull out the undrawn yarn bundles from the 32 yarn storage containers and align 32 yarns.
The film was drawn 3.6 times at a drawing temperature of 80 ° C. and a drawing speed of 120 m / min to obtain a drawn yarn bundle having a single yarn fineness of 3.7 d and a strength of 2.1 g / d.

Examples 2 to 4 and Comparative Examples 1 and 2 The same procedure as in Example 1 was carried out except that the temperature and the amount of the oil dropped onto the oiling roller from the oil applying device were changed as shown in Table 1.

Example 5 The procedure of Example 1 was repeated except that the copolymerized polyester obtained in Production Example 2 was used as a sheath component.

Example 6 The procedure of Example 1 was repeated except that the copolymerized polyester obtained in Production Example 3 was used as a sheath component.

In Examples 1 to 6 and Comparative Examples 1 and 2, evaluations were made on the amount of the oil agent adhered to the undrawn yarn bundle, turbulence when pulled out, the number of occurrences of entanglement, the presence or absence of single yarn breakage, and the presence or absence of fusion. Table 1 shows the results.

[0029]

【table 1】

As is clear from Table 1, in Examples 1 to 6, the yarn bundle can be stably stored in the yarn storage container without causing breakage of the single yarn and fusion of the fibers. Also, when being pulled out of the storage container, there was almost no disturbance or tangle. On the other hand, in Comparative Example 1, the oil temperature was too high, and in Comparative Example 2, the oil agent was not dropped by the oil applying device, so that the yarn bundle could not be completely cooled, and fusion of fibers occurred. However, when they were pulled out of the storage container, turbulence and tangles frequently occurred.

[0031]

According to the present invention, a large amount of low-temperature oil can be stably applied to the undrawn yarn, and the yarn can be efficiently and sufficiently cooled. It is possible to store the battery well without causing fusion between them. Accordingly, even when the stored undrawn yarn bundle is pulled out from the yarn storage container, the yarn bundle is not disturbed or entangled, and the operability of the drawing process can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one embodiment of an oiling roller used in the present invention.

FIG. 2 is a schematic view showing one embodiment of a conventional oiling roller.

[Explanation of symbols]

 Y undrawn yarn 1 oiling roller 2 oil applying device 3 dripping oil 4 oil bath 5 oil

Claims (1)

[Claims] 1. A core component comprising a polyalkylene terephthalate having a melting point of 220 ° C. or higher, a sheath component comprising a terephthalic acid component, an ethylene glycol component, an aliphatic lactone component and a 1,4-butanediol component, and having a glass transition point of 20 to 50 ° C. , Melting point
After spinning composite fibers of a core-sheath structure, which is a crystalline copolyester at 130 to 180 ° C, and cooling and solidifying, applying an oil agent with an oiling roller, bundling a plurality of them, and storing them as undrawn yarn bundles A method of applying an oil agent at a temperature of 20 ° C. or lower while dropping the oil agent on an oiling roller when storing the oil agent in the oiling roller.