KR101216003B1 - Process Of Producing Self―Crimped Polyester Conjugated Fiber - Google Patents

Abstract

The present invention relates to a spontaneous high-stretch polyester composite fiber spun in a side by side form by using heterogeneous polyethylene terephthalate polymers having different intrinsic viscosities as raw materials. It is possible to provide a fabric with excellent deep color by making the reflected light less, deepening effect, and deepening part and gloss part feeling strong contrast depending on the angle to make clear and deep color tone.

Description

Process of Producing Self-Crimped Polyester Conjugated Fiber

The present invention relates to a polyester composite fiber in the form of side by side composed of a first component polymer and a second component polymer.

The side-by-side polyester composite fiber of the present invention has been variously developed until the mid-1980s due to its high utilization as a functional fiber through the development of release cross-section technology and alkali reduction technology in the 1970s.

Polyester-based composite spinning material is widely produced by domestic synthetic fiber companies, and the material by composite spinning of heteropolymers has unique surface characteristics and excellent repulsion, and it has excellent elasticity, resilience and crimping of helical structure. It exhibits unique surface characteristics with high repulsion characteristics and refreshing feeling. It is generally used for clothing, casual wear, suits, underwear, etc., and is also used for footwear and interiors.

Composite spun fiber is a fiber composed of two types of polyester with different shrinkage ratios in a side by side type. This is a kind of latent crimping yarn with special bimetallic structure, which not only provides a comfortable stretch function when expressing crimping, but also has excellent unique surface characteristics and repulsion. (Koshi), repulsion, and features that can significantly improve the feel.

Composite spun fiber is not only soft but also has excellent elongation and bulky feeling. Presently introduced composite fiber is mainly composed of PET and PTT combined eccentric structure, oval or peanut-type composite fiber, and the mountain flat circular cross section with three mountains is relatively difficult to spin It is not produced, and the fine-grained manufacturing technology is not yet established.

On the other hand, the high color development of the characteristics of the composite fiber is applied to women's dresses and blouse, such that it is given a soft luster and drape, it is possible to develop a variety of products, in particular, fully differentiated from existing products by utilizing the deep color of the yarn It will be applied to Formal Black Chador costume, which is a traditional costume of high-priced Muslim women, and it will be able to expand its market and export high-priced differentiated products to developed markets such as Japan, EU, and US where black fabric is highly marketable. .

Eccentric, oval or peanut-type composite spun fiber combining conventional PET and PTT has excellent stretch and elastic recovery. Drape, and the effect of cooling on wearing, but there was an effect, but no deep color after dyeing of the fabric was found.

Therefore, in the present invention to solve the problem of the conventional side-by-side type composite fiber dyeing to provide a composite fiber capable of weaving a high color, high density fabric as a technical problem. Therefore, the present inventors have a multi-spiral latent twist effect in which the fiber cross-section has a flattened cross section continuously extending in the longitudinal direction, and is a simple flat yarn in a real state, but three acid flat circular cross sections on a fabric are salted. After processing, it was found that the deep color effect due to the diffuse reflection effect can be obtained in the symmetrical direction to complete the present invention.

Therefore, according to the present invention, in the side by side type polyester composite fiber composed of the first component polymer and the second component polymer,

Viii) the first component polymer is polyethylene terephthalate (PET) having an intrinsic viscosity of 0.61 to 0.65;

Ii) the second component polymer is polyethylene terephthalate (PET) having an intrinsic viscosity of 0.49 to 0.52;

Vi) A spontaneous highly crimped polyester composite fiber is provided, characterized in that the weight ratio of the first component and the second component is 50:50 to 55:45.

Hereinafter, the present invention will be described in more detail.

The spontaneous highly crimped polyester composite fiber of the present invention is a yarn useful for weaving a fabric having excellent deep colorability by composite spinning in a side by side form using a heterogeneous polyethylene terephthalate polymer having different intrinsic viscosity as a raw material.

In the present invention, a preferred method for producing spontaneous high-stretch polyester composite fibers is to use two polyethylene terephthalate polymers but different intrinsic viscosity, but the polyethylene tere is 0.61 ~ 0.65 intrinsic viscosity of the first component polymer The phthalate and the polyethylene terephthalate having an intrinsic viscosity of 0.49 to 0.52, which are the second component polymer, are spun in a composite spinning so as to have a side by side shape in a weight ratio of 50:50 to 55:45, and are wound by winding.

The weight ratio of the first component and the second component of the two polymers having different intrinsic viscosities should be 50:50 to 55:45 to prevent the difference between the three acid flat circular cross sections, and the acid flat flat cross section of a certain size. It is possible to produce a composite fiber having a.

Particularly, the intrinsic viscosity difference between the first component polymer and the second component polymer is preferably 0.10 to 0.15. When the intrinsic viscosity difference is less than 0.10, there is a problem that no potential torsion occurs, and the intrinsic viscosity difference exceeds 0.15. Excessive torsion may occur.

The raw material polymers are produced and stored in a chip state, except when the polymerization process and spinning are connected (direct spinning), and when mixed, they are mixed and dried.

The drying step is carried out for the purpose of preventing the lowering of the molecular weight due to hydrolysis in the air and making the molecular weight difference between the chips uniform. However, the moisture content of the dried chips is required to be 0.001 to 0.005% by weight of drying. The undried chip is dried in two stages of the drying process, preliminary drying at 100-120 ℃ for 10 minutes and drying at 160-200 ℃ for 1 ~ 3 hours. Crystallization in advance prevents the risk of chips sticking together when forming at high temperatures.

Thus dried PET chip is melted at 280 ~ 290 ℃ by an extruder is supplied to the gear pump (gear pump). The extruder is composed of screw and barrel. It has the functions of feeding, compressing and weighing, and it continuously plays the role of supplying the chips to the next process while continuously melting the chips to be fed and measuring after extrusion defoaming. . The molten polymer carried by the screw is supplied to the spinning head through several branch pipes as necessary.

The spin head consists of a heating metal block and is equipped with a metering pump and a spin pack to heat the whole evenly. High temperature and high pressure require high materials and fine pores to ensure uniform discharge by rotation of the gear. Weighed polymers are supplied to the spin pack. The spin pack is made of a thick metal cylinder and consists of a pressure plate between the upper cover plate and the detention, a particle layer made of sand or metal powder, and a filtering device made of metal mesh. The filter should be able to reduce the pressure rise caused by this removal as much as possible while effectively removing the dead objects. The molten polymer cleaned by the filter is supplied to a nozzle made of a pressure-resistant disc of about 5 to 10 mm in thickness and discharged from the spinneret's orifice, which is generally circular and has a diameter of 0.20 to 0.30 mm. The ratio of length to diameter is 1: 1.15 or more.

In the present invention, the spinneret has a cross-sectional shape of the spontaneous high crimp polyester composite fiber, and in order to minimize the gap between the filaments, as shown in FIG. The discharge holes are formed at equal intervals, and each discharge holes are connected by slits, and the interval between each discharge holes is 1.8 to 2.5 times the diameter of the discharge holes, which is suitable for making a mountain flat of a constant size. Working at ℃ is a suitable condition for the physical properties of the yarn.

The yarn flux discharged from the spinneret is cooled and solidified by the cooling airflow. The cooling method is that in the case of filament yarn, the air flow is perpendicular to the traveling direction of the yarn. The air used is important to control temperature and humidity, and this air flow condition is an important factor directly affecting the orientation uniformity.

The cooled filament is imparted with oil. The oil is imparted to secure winding stability of the unstretched yarn and to facilitate handling in post-processes such as stretching and burning. The emulsion used is usually an aqueous or non-aqueous emulsion in which a smoothing agent, an antistatic agent, a focusing aid, etc. are used.As a means for imparting an emulsion, the oil is picked up on the surface of the rotating roller and the oil is applied to the surface. The method of making it contact and attaching, the method of providing an oil supply port to a guide, and supplying to an yarn contact point are used.

The winder consists of a godet roller and a winder. In order to increase productivity, the thread of the book is wound by a winding machine which can wind the thread by dividing the thread through a set of Godet rollers. Recently, a winding device capable of winding up to 8,000 m / min has been commercialized, but in the present invention, it is preferable to set the speed at 2800 to 3400 m / min, but less than 2800 m / min causes a problem of falling strength, and 3400 m / min. If exceeded, the problem of falling elongation may occur. It can be seen that the strength increases and the elongation decreases as the spinning speed increases under the constant condition of low viscosity / high viscosity. As the packing density in the molecule becomes close due to tension, it is believed that the cutting strength increases and the cutting elongation tends to decrease due to the increase in the winding speed.

The spontaneous highly crimped polyester composite fiber provided in the present invention has a physical strength of 2.30 to 2.70 g / d, elongation 115 to 120%, and wet heat shrinkage ratio of 74 to 78%. When the torsion occurs in the phase, the composite fiber becomes a fabric with a deep gap in the plate vertically aligned in the longitudinal direction of the torsional cross section between the tissues, and the light incident on the vertical part is less reflected specularly from the naked eye and reflected between the fibers. The internal absorption is repeated and the deepening effect is generated. The deepening part and the gloss part feel the contrast strongly according to the angle, and the deep color is excellent because the vivid and deep color tone are made.

Therefore, spontaneous high crimping polyester composite fiber produced according to the present invention is excellent in color development and deep colorability when manufacturing the fabric can be usefully used for women's blouse, dress, two-piece, moisturized car or the like.

1 is a view showing the shape of the discharge port of the spinneret for producing the spontaneous high crimping polyester composite fiber of the present invention,
Figure 2 is a cross-sectional micrograph of the spontaneous high crimping polyester composite fiber of the present invention,
Figure 3 is a photograph for comparing the deep color between the fabric of Example 1 and the fabric of Comparative Example 1 woven and dyed with spontaneous high-stretch polyester composite fiber of the present invention.

Hereinafter, the following examples are given as non-limiting examples of the method for producing the spontaneous highly crimped polyester composite fiber of the present invention.

Example 1

1. Composite fiber spinning and weaving

Viscosity (IV) 0.626 (ASTM D2857-70), Melting point 253.2 ℃, Moisture content 0.1% by weight, Chip size 3.6 mm High viscosity polyethylene terephthalate (PET: first component polymer) chip and viscosity (IV) 0.505 70) Melting point 257 ° C., low viscosity polyethylene terephthalate (PET: second component polymer) chips with a water content of 0.1 wt% and a chip size of 3.6 mm were melted while being supplied to the compressor at a weight ratio of 55:45 and supplied to the gear pump. After supplying to the spinning head having a spinneret as shown in Figure 1 by spinning at a spinning temperature of 287 ℃, winding speed of 3,000m / min and cooled, oil was added to spun 85d / 24f unstretched polyester composite fiber .

After the obtained unstretched polyester composite fiber was made a composite processing using a 3-Feed Belt Combustor (MURATA-33H Type), using a shuttle loom weaving machine to a slope density of 104T level and weight 135g / ㎡, tissue is made of plain weave, refined, reduced and pre-set, and then weight loss using a CDR continuous reducer, dyed using a rapid dyeing machine and then using silicone resin After processing the deep color resin, the final setting was completed to the final fabric.

Comparative Example 1

General polyester unstretched yarn (POY 85/72) and SDY 50/24 were flammable to produce a composite workpiece, and then weaved and dyed under the same conditions as in Example 1.

2. Composite Fiber Property Evaluation

end. Signed Strength

Each sample left at room temperature for 24 hours using Textechno Statimat Me. (German) was tested 10 times under conditions of a sample length of 200 mm and a test speed of 2000 m / min. Breaking Tenacity and Breaking Elongation were obtained from the software provided in the experimental device, and the average value of 10 times was obtained from each result.

 I. Shooting shrinkage characteristics (wet heat shrinkage rate experiment)

 After winding the sample on the reel of the detector and making it into a state of state, apply a 0.1 g / d super-load to the yarn to obtain the ledger, and then immerse it in a water bath at 100 ° C for 30 minutes under no tension and perform moist heat treatment for at least 24 hours. After being left at room temperature, the amount of shrinkage was measured by measuring the length of the sample with an ultraload of 0.1 g / d.

Moist heat shrinkage (%) = {(initial ledger-contracted length after treatment) / (initial ledger)} × 100

Physical properties of the composite fiber are shown in Table 1 below.

division
                          Property evaluation   Fineness (d)   Tensile strength (g / d)   Shinto (%)   Wet Heat Shrinkage (%) Example 1   85.88     2.55   117.04    76.6

3. Fabric Property Evaluation

end. Wash fastness

It was measured using ATLAS LOUND-OMETER using the A-1 method of KS K 0430 (Dyeing fastness test method for washing).

I. Phosphorus strength

The tear strength of the fabric was measured using an Elmendorf tear strength tester according to the K0535 fabric's tear strength test method.

All. Dimensional change rate

Washing shrinkage of the fabric was measured by the domestic washing machine method according to the shrinkage test method of KS K0465 fabric, and was calculated by the following equation.

 Shrinkage (%) = {(A-B) / A} × 100

Where A: average of measured values before treatment, B: average of measured values after treatment

la. Evaluation of color depth (L value)

In order to confirm the degree of deep color of the fabric using CCM (Color-Eye 7000A Macbath, USA) to compare the difference in the L value and to evaluate the degree of deep color is shown in Table 2.

hemp. Shape observation

In order to observe the appearance of the development yarn and fabrics, the side observation was observed using an image analyzer (STEMI 2000-C, ZEISS, Germany), and the cross section was coated with Au under a 75 × 10 ^-3 mmHg reduced pressure, and then a scanning electron microscope (SEM). , Hitachi Co., Ltd., Japan) to observe the shape is shown in Figures 2 and 3.

Evaluation item unit Example 1 Comparative Example 1 Assessment Methods Heart color  L value 8.75 9.54 CCM Evaluation Method Phosphorus strength g 1,800 1,700 KS K 0534 Wash fastness class 4 4 KSK ISO 105-C06 Light fastness class 4 3-4 KSK ISO 105-B02

Claims (5)

delete delete delete Polyethylene terephthalate having an intrinsic viscosity of 0.61 to 0.65
Polyethylene terephthalate having an intrinsic viscosity of 0.49 to 0.52, which is the second component polymer, has three acid-flat circular cross-section discharge ports having a diameter of 0.18 mm formed at equal intervals, and each discharge port is connected by a slit having a thickness of 0.09 mm, and there is a gap between the discharge ports. Of spontaneous high crimped polyester composite fiber characterized in that the spun yarns are spun in a weight ratio of 45:55 to 55:45 through a spinneret which is 1.8 to 2.5 times the diameter of the discharge port, and is wound by impregnating with an emulsion. Manufacturing method.
5. The method of claim 4,
The spinning temperature at the time of the composite spinning is 280 ~ 290 ℃, the production method of spontaneous high crimping polyester composite fiber, characterized in that the yarn speed 2800 ~ 3400 m / min.

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