JP2009174098A - Polyester hollow filament spinning type nonwoven fabric and production method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polyester hollow filament nonwoven fabric improved in thickness feeling, heat retaining property and acoustic property and produced by using a hollow spinneret when producing polyester filament nonwoven fabric, and to provide a production method thereof. <P>SOLUTION: The production method of the polyester hollow filament spinning type nonwoven fabric includes a step for spinning a polyester to be hollow shape by using a hollow spinneret and drawing to produce polyester filament fiber having 10-80 μm diameter, a step for laminating on a continuously moving net the produced polyester filament fiber as a web, and a step for heat-fusing or needle-punching the laminated filament web. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a polyester hollow long fiber nonwoven fabric and a method for producing the same, and more specifically, in the production of a polyester long fiber nonwoven fabric, a feeling of thickness, heat retention, and sound absorption of the nonwoven fabric produced using a hollow die. TECHNICAL FIELD The present invention relates to a polyester hollow long fiber nonwoven fabric having an improved surface roughness and a method for producing the same.

Conventionally, the short-fiber nonwoven fabric was the only nonwoven fabric using hollow fibers. Such a short fiber nonwoven fabric has a low productivity and is processed through a number of processes because a short fiber having a length of about 20 to 100 mm is subjected to a carding process to form a mechanical or thermal bond. There was a disadvantage that the cost was high.

Moreover, in the long-fiber non-woven fabric, the hollow base for forming the hollow fiber is not applied, so that the hollow long-fiber non-woven fabric cannot be provided. For this reason, the polyester needle punched nonwoven fabric used for the heat insulating material for building materials is the non-hollow long fiber nonwoven fabric and does not contain air. There was a problem that it was low and inferior in sound absorption.

On the other hand, in the name of “long fiber nonwoven fabric and production method”, “nonwoven fabric formed of long fibers made of a polylactic acid polymer, wherein the polylactic acid polymer is poly (D-lactic acid), poly (D L-lactic acid), a copolymer of D-lactic acid and L-lactic acid, a copolymer of D-lactic acid and hydroxycarboxylic acid, and a copolymer of L-lactic acid and hydroxycarboxylic acid. A long-fiber non-woven fabric made of a polylactic acid polymer characterized by being a polymer having a melting point of 100 ° C. or higher, or a mixture of these polymers having a melting point of 100 ° C. or higher is disclosed ( For example, see Patent Document 1 below). The cross section of the long fiber has various shapes, and a hollow type is disclosed as an example. However, the main purpose of the present invention is to provide biodegradability, and can be used. The raw materials are limited to those described above, and the problems that occur during the production of the illustrated hollow long fiber nonwoven fabric and the means for solving it are not described at all.

Therefore, as a result of intensive research on a method for solving functional problems such as low heat retention and sound absorption in the above-described conventional long-fiber nonwoven fabric, the present inventors have adjusted the production conditions of various nonwoven fabrics. The inventors have found that the above problems can be solved, and have completed the present invention.
Korean Patent Application No. 1996-0042661

The present invention has been made in view of the above circumstances, and its purpose is to enable production of a polyester hollow nonwoven fabric in-line, shorten the process, and enable high-speed production of a hollow long fiber nonwoven fabric. It is in providing the manufacturing method of.

Another object of the present invention is to provide a hollow long fiber that complements the drawbacks of the above-mentioned conventional polyester long fiber spunbonded nonwoven fabric, lowers the thermal conductivity and thermal conductivity of the nonwoven fabric itself, and enhances heat retention and sound absorption. It is to provide a non-woven fabric.

In order to achieve the above object, the method for producing a polyester hollow long fiber spinning type nonwoven fabric according to the present invention comprises spinning a polyester into a hollow shape using a hollow die and drawing it into a polyester filament fiber having a diameter of 10 to 80 μm. And a step of laminating the produced polyester filament fiber as a web on a continuously moving net, and thermally bonding or needle punching the laminated filament web. To do.

According to another configuration of the present invention, the hollow die has 2 to 4 spin hole slits in the spinneret, and the slit width (a) is 0.05 to 0.3 mm. The slit interval (b) is 0.05 to 0.3 mm, the inner diameter (ID) of the slit is 0.4 to 1.2 mm, and the capillary length of the die is 0.1 to 1.0 mm. Features.

According to another configuration of the present invention, the nonwoven fabric uses a polyester having an intrinsic viscosity (IV) of 0.60 to 0.70.

According to another configuration of the invention, the discharge rate of the spinning hole through the spinneret is 0.1 to 25 g / min. It is a hole.

According to another configuration of the present invention, the spinneret has a circular or oval cross-sectional shape.

In order to achieve the above-mentioned other object, the polyester hollow long fiber spinning type nonwoven fabric of the present invention has a diameter of 10 to 80 μm and a thickness of 10% or more than a fiber having a circular section with the same weight. It is a polyester hollow long fiber nonwoven fabric containing hollow fibers having an area hollowness of 10% or more.

The polyester hollow long fiber spinning type nonwoven fabric of the present invention is produced by spinning a hollow base using a hollow die under appropriate spinning conditions to form a web, which is subjected to a calender and then thermally bonded or needled. By punching and producing a hollow nonwoven fabric, it has excellent heat retention, thickness and bulky feeling, and can further improve heat insulation and sound absorption. Further, the process can be greatly simplified and the cost can be reduced as compared with the polyester hollow fiber produced as an existing short fiber product.

Hereinafter, the present invention will be described in more detail based on preferred embodiments with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing a spinning hole in a spinneret used for producing a polyester hollow long fiber nonwoven fabric according to the present invention, and FIG. 2 is a SEM photograph of a cross section of a polyester hollow long fiber nonwoven fabric produced according to the present invention. FIG. 3 is a comparative photograph of the thickness when a non-woven fabric having the same weight is pressed with the same load.

In the nonwoven fabric according to the present invention, the polyester chip having an intrinsic viscosity (IV) of 0.60 to 0.70, preferably 0.62 to 0.68 is adjusted to have a moisture content of 100 ppm, preferably 50 ppm or less with a dryer. Crystallize and dry. If a polyester chip having an intrinsic viscosity (IV) of 0.60 or less is used, there is a drawback that the strength of the nonwoven fabric is reduced. Conversely, if a polyester chip having an intrinsic viscosity (IV) of 0.70 or more is used, There is a disadvantage that spinning is not performed well and high-speed production is impossible.

The chips crystallized and dried as described above are melted by an extruder at a temperature of 270 to 320 ° C., preferably 280 to 295 ° C., and spun from a die designed for hollow use as shown in FIG.

The hollow die shown in FIG. 1 preferably has 2 to 4 spinning hole slits in the spinneret, the slit width (a) is 0.05 to 0.3 mm, and the slit spacing. (B) is 0.05 to 0.3 mm, the inner diameter (ID) of the slit is 0.4 to 1.2 mm, the capillary length of the die is 0.1 to 1.0 mm, A spinneret having 1 to 600 spinning holes was used, whereby the discharge rate of the spinning holes was 0.1 to 25 g / min. Spin with hole. At this time, the number of spinning holes in the base must be designed in consideration of the cooling efficiency, and the form of the base is the space between the cooling airflow and the slit that is not discharged, that is, the part where the polymer is joined. In consideration of the above, it must be designed in a circular or elliptical shape so as to have a clean cross section. The slit width needs to be designed so that the back pressure of the die is at an appropriate level, and if it is too wide, a polymer pool is formed on the upper part of the die plate, the flow becomes uneven, and the yarn breakage occurs. If the back pressure is too high due to being too narrow, the base will be damaged. Considering the cooling airflow, the slit interval should be designed appropriately, because if it is too wide, a good cross section cannot be obtained by the die swell, and if it becomes too narrow, hollow formation cannot be obtained.

The spun polymer is cooled and solidified by cooling air of 10 to 25 ° C., preferably 15 to 20 ° C., injected from a honeycomb-like chamber. At this time, the wind speed of the cooling air is preferably 10 to 45 m / min, and more preferably 25 to 35 m / min. The cooled polymer is drawn as a filament using an ejector with an air pressure of 2 to 10 kg / cm 2, preferably 4 to 6 kg / cm 2.

The filaments are spun so that each filament fiber has a diameter of 10 to 80 μm, preferably 20 to 40 μm, more preferably 25 to 40 μm, and the filaments are collided with a collision plate at a certain angle and speed to disperse the filaments. And uniformly laminating on the moving conveyor belt using the lower suction device to form a web. The basis weight of the web is adjusted by the number of holes in the discharge cap, the discharge amount, and the speed of the conveyor. The nonwoven fabric according to the present invention is manufactured by heat bonding or needle punching of the web formed in this manner in order to impart a certain form, physical characteristics, and the like.

Hereinafter, although this invention is demonstrated further in detail based on an Example, it cannot be overemphasized that the range of this invention is not restricted to these Examples.

Example 1 and Example 2
A hollow die manufactured in consideration of draft, back pressure, hollow ratio and the like was bonded to a normal polyester spunbond nonwoven fabric production facility. Polyester chips having an intrinsic viscosity of 0.65 are dried in a dryer, crystallized and supplied to an extruder. The continuously supplied chips are melted, mixed and mixed in a high-temperature extruder, and passed through a hollow die hole. Spinning at about 1.7 to 2.8 g per minute to form a filament, cooling the filament with cooling air supplied from the cooling chamber and solidifying to prevent fusion between the filaments, air pressure 4 to 5 kg The filament is stretched by using an ejector of / cm 2 to have a characteristic as a filament.

In order to form a web, the filament is collided with an impact plate at a constant angle and speed to disperse the filament, and the web is laminated on a continuously moving conveyor using a lower suction device. Form. At this time, the speed of the conveyor belt was about 14 to 20 m per minute. In order to fix the web, the temperature of the calendar is about 165 ° C., the linear pressure is about 60 kg / cm, and needle punching is performed to make the web have a form stability and a physical property level. A nonwoven fabric having the weight and thickness shown in FIG. Each characteristic of the nonwoven fabric thus manufactured was measured, and the results are shown in Table 1. As is apparent from Table 1, the nonwoven fabric produced by this example has a good hollowness of 23 to 25%, a thickness of 25 to 32%, and is extremely excellent in heat retention and sound absorption. .

Further, as a result, a cross-sectional SEM photograph of the produced polyester hollow long fiber nonwoven fabric is shown in FIG. 2, and in order to show the thickness difference between the hollow long fiber nonwoven fabric and the mono long fiber nonwoven fabric, Example 1 and Comparative Example 1 below are shown. FIG. 3 shows a thickness comparison photograph when the nonwoven fabric produced by the above is pressed with the same load.

Comparative Example 1 and Comparative Example 2
A non-woven fabric having the weight and thickness shown in Table 1 below was manufactured in the same manner as in the example except that the same polymer as in the above example was used and an existing mono-type die that was not a hollow die was used. Each characteristic of the nonwoven fabric thus produced was measured, and the results are shown in Table 1 below.

It is sectional drawing which shows the spinning hole in the spinneret used for manufacture of the polyester hollow long fiber nonwoven fabric by this invention. It is a SEM photograph of the cross section of the polyester hollow long fiber nonwoven fabric manufactured by this invention. It is a thickness comparison photograph when pressing the same weight nonwoven fabric with the same load.

Claims (6)

Spinning polyester into a hollow shape using a hollow die and drawing to produce polyester filament fibers having a diameter of 10 to 80 μm;
Laminating the produced polyester filament fiber as a web on a continuously moving net;
Heat-bonding the laminated filament web or needle punching, and a method for producing a polyester hollow long fiber spinning type nonwoven fabric. In the hollow die, the number of spinning hole slits in the spinneret is 2 to 4, the slit width (a) is 0.05 to 0.3 mm, and the slit interval (b) is 0.05. The polyester according to claim 1, wherein the inner diameter (ID) of the slit is 0.4 to 1.2 mm, and the capillary length of the die is 0.1 to 1.0 mm. A method for producing a hollow long fiber spinning nonwoven fabric. 2. The method for producing a polyester hollow long fiber spinning type nonwoven fabric according to claim 1, wherein the nonwoven fabric uses a polyester having an intrinsic viscosity (IV) of 0.60 to 0.70. The discharge rate of the spinning hole through the spinneret is 0.1 to 25 g / min. The method for producing a polyester hollow long fiber spinning type nonwoven fabric according to claim 1, wherein the method is a hole. The method for producing a polyester hollow long fiber spinning type nonwoven fabric according to claim 1, wherein the spinneret has a cross-sectional shape that is circular or elliptical. A method manufactured by the method according to any one of claims 1 to 5, having a diameter of 10 to 80 µm, and having a thickness of 10% or more than a fiber having a circular section with the same weight. And a polyester hollow long fiber spinning type nonwoven fabric comprising hollow fibers having an area hollowness of 10% or more.

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