KR20040104142A - Manufacturing method of elastic polyester non-woven fabric - Google Patents

Abstract

PURPOSE: Polyester spun-bonded non-woven fabric has dense structure, shape stability and permeability of an battery electrolyte. The polyester spun-bonded non-woven fabric is capable of preventing resin from dropping, increasing workability and extending the expected life span of a battery. A manufacturing method thereof is provided. CONSTITUTION: Polyester spun-bonded non-woven fabric is obtained by the steps of: preparing low melting point polyester having 200-250deg.C of melting point and existing polyester having 250-260deg.C of the melting point; drying each polyester in each dryer; controlling the low melting point polyester and the existing polyester supplied through each melting extruder in a ratio of 0-50wt.% : 100-50wt.% with a supplying pump; controlling discharge and draw ratio with pneumatics of an ejector to make fineness of each filament into 1-7denier; gathering the filaments blended uniformly on a conveyor belt to form web; and then heat-fusing the web with an uneven embossing roll having 5-50% of bonding rate.

Description

Polyester spunbond nonwoven fabric and its manufacturing method {Manufacturing method of elastic polyester non-woven fabric}

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a polyester spanbonded nonwoven fabric which promotes stabilization of form by applying a resin to a surface portion of a lead plate and attaching a nonwoven fabric thereon to prevent the resin from flowing down. When the paper is used, it is stuck to each other, the separation is not good, but the nonwoven fabric of the present invention is well separated and can improve the workability, it is easy to pass the battery electrolyte to extend the battery life of the polyester-based The present invention relates to a manufacturing method for efficiently producing a spunbond nonwoven fabric.

In the past, the resin was applied to the lead plate inside the battery, and then the paper was stabilized in order to prevent the resin from flowing down. There is a problem that the battery electrolyte does not pass well, causing shortening of the battery life.

The present invention used a polyester spanbond nonwoven fabric to solve the problems as described above, the dense structure of the nonwoven fabric to prevent the flow of the resin, the shape stability and easy separation during processing of the lead plate work An object of the present invention is to provide a method for efficiently producing a polyester spunbond nonwoven fabric which is excellent in performance and excellent in permeability of a battery electrolyte and exerts an effect as a material capable of extending the life of a battery.

1 is a view showing the shape of the ◆ surface engraving having a bonding rate of 10% of the thermal bonding embossed roll of the spunbond nonwoven fabric of the present invention,

Fig. 2 is a surface of a mold having a bonding ratio of 10% for the thermally bonded embossed roll of the spunbonded nonwoven fabric of the present invention.

The figure which shows the form of the sculpture,

Figure 3 is a shape diagram showing the shape of the ★ -shaped surface pieces of the bonding ratio of the thermal bonding embossed roll of the spunbond nonwoven fabric of the present invention 10%.

Fig. 4 is a surface of a mold with a bonding ratio of 10% for the thermally bonded embossed roll of the present invention spanbonded nonwoven fabric.

It is a figure showing the form of a sculpture.

5 is a bonding ratio of the thermal bonding embossed roll of the inventive spunbond nonwoven fabric is 10% It is a figure which shows the form of the mold surface fragment.

6 is a bonding ratio of the thermal bonding embossed roll of the invention spunbond nonwoven fabric of 10% It is a figure which shows the form of the mold surface fragment.

The present invention is a filament constituting the nonwoven fabric is a low melting point polyester having a melting point of 200 to 250 ℃ and a conventional melting point of 250 to 260 ℃ polyester is dried in each dryer, and distributed through different melt extruders Each filament has a filament fineness of 1-7de, with a ratio of 0 to 50%: 100 to 50% of the low-melting polyester and the existing polyester having a melting point of 200 to 250 DEG C. The amount of discharge is controlled by the discharge amount and the air pressure of the ejector, and the web is formed by collecting a uniformly mixed filament on a porous conveyor belt continuously moving, and then forming the web with a bonding ratio of 5 to 50. It is heat-sealed with the uneven emboss roll which is% to give constant strength and form stability.

The spunbonded nonwoven fabric of the present invention has an intrinsic viscosity (IV) of 0.50 to 0.68 and a melting point of 250 to

260 ° C. polyester and low melting point polyester polymer having intrinsic viscosity (IV) of 0.50 to 0.68 and melting point of 200 to 250 ° C. were crystallized and dried in each dryer so that the moisture content was 100 ppm or less, and then 280 to 295 ° C. And melt blended in each extruder at 220-270 ° C., and spun through a pack of holes 0.20 to 0.60 mm in diameter through a pack consisting of each feed pump, and the polymer passed through a honeycomb chamber. It cools and solidifies by cooling air around 18 degreeC injected, and it extends | stretches through the ejector whose air pressure is 3.0-5.0 kg / cm <2>. The filament is dispersed by impinging the stretched filament on the collision plate at a constant angle and speed, and commercialized by blending the ratio between low melting polyester filament and conventional polyester filament at 0-50%: 100-50% By opening the filament consisting of 100% of the polyester having a melting point of 250 to 260 ° C., the web can be uniformly laminated on a continuously moving conveyor belt.

When the ratio of the low melting polyester is more than 50%, the polyester is fused during the calendering process for imparting the form stability of the nonwoven fabric, resulting in a decrease in workability such as stopping the line. Moreover, it is preferable that the basis weight of a nonwoven fabric at this time is 15-70 g / m <2>.

If the basis weight is lower than 15g / m2, the resin flows down during adhesion

If this becomes poor and higher than 70 g / m <2>, it will shorten the life of a battery by the poor permeability | transmission of electrolyte solution.

The basis weight of the web is controlled by the odd number of discharge outlets, the discharge amount and the speed of the conveyor. The formed web is subjected to a constant temperature and pressure between an uneven embossing roll with a bonding rate of 5 to 50% and a flat roll with a smooth surface in order to impart uniform shape, physical properties and constant permeability. By imparting and heat-sealing, the spunbonded nonwoven fabric of the present invention can be produced.

EXAMPLE

Based on the following examples, the present invention will be described in detail. The measurement and evaluation of the various characteristics in the Example were analyzed by the method shown next.

(1) Tensile strength: According to ASTM D1682-64 method using United company equipment of USA

Ten specimens having a sample width of 5 cm and a sample length of 7.5 cm were subjected to a tensile rate of 300 mm / min.

The maximum tensile strength under the conditions is expressed as an average value measured individually.

(2) Tensile elongation: The elongation at maximum elongation measured by the method (1) above is determined.

(3) Tear strength: measured by Toung method of ASTM D2253.

Hereinafter, the present invention will be described in detail with reference to Examples.

Example 1

Polyesters having an intrinsic viscosity (IV) of 0.65, a melting point of 255 ° C., and low melting polyester polymers having an intrinsic viscosity (IV) of 0.65 and a melting point of 220 ° C. were dried and crystallized in each dryer to have a moisture content of 100 ppm or less. Each zone is supplied to each extruder whose temperature is set to 280-295 ℃ and 250-270 ℃, and the chips continuously supplied are melted, mixed and mixed in the extruder and configured as one through each supply pump. Through the pack it is emitted through holes in holes of 0.20 to 0.60 mm in diameter. At this time, the low melting point polyester is 30% of the total weight, the two kinds of polyester is spun to 230g per minute to form a filament, and the filament is cooled by the cooling air supplied from the quenching chamber (quenching chamber) , Solidification to prevent fusion between filaments, and extends the filament through an ejector with an air pressure of 3.5㎏ / ㎠ to give the characteristics as a filament. To form the web, the filaments are collided with the impingement plate at a constant angle and speed to disperse the filaments, and are uniformly stacked on a continuously moving conveyor using a lower suction device to form a web. In this case, the speed of the conveyor belt was 73m / min, and the temperature of the emboss roll was 210 ° C and 208 ° C, and the linear pressure was 60kg / cm to heat-seal the web. The embossed form of the upper roll used a bonding rate of 10% as shown in FIG. At this time, the physical properties of the nonwoven fabric and the separation performance during the lead plate operation and the electrolyte passing rate were measured, and the results are shown in Table 1.

Example 2

In Example 1, the intrinsic viscosity (IV) was 0.65, 100% of the polyester having a melting point of 255 ° C was used, the temperature of the embossing roll was 230 ° C at the top, 228 ° C at the bottom, and the linear pressure was 60 kg / cm. The other process conditions were the same. At this time, the physical properties of the nonwoven fabric and the separability during the lead plate operation and the passage of the electrolyte solution was measured, and the results are shown in Table 1.

Example 3

In Example 1, the embossing form of the upper embossing roll was used as the bonding ratio of the form as shown in FIG. The other process conditions were the same. At this time, the physical properties of the nonwoven fabric and the separability during the lead plate operation and the electrolyte passability were measured, and the results are shown in Table 1.

Example 4

In Example 1, the embossed form of the upper embossing roll was used as the bonding ratio of the form as shown in FIG. The other process conditions were the same, and the physical properties of the nonwoven fabric at this time and the separability during the lead plate operation and the permeability of the electrolyte solution were measured, and the results are shown in Table 1.

Example 5

In Example 1, the embossed form of the upper embossing roll was used as the bonding ratio of the form as shown in FIG. The other process conditions were the same, and the physical properties of the nonwoven fabric at this time and the separability during the lead plate operation and the permeability of the electrolyte solution were measured, and the results are shown in Table 1.

Example 6

In Example 1, the embossed form of the upper embossing roll was used as the bonding ratio of the form as shown in FIG. The other process conditions were the same, and the physical properties of the nonwoven fabric at this time and the separability during the lead plate operation and the permeability of the electrolyte solution were measured, and the results are shown in Table 1.

Example 7

In Example 1, the embossing form of the upper embossing roll was used as the bonding ratio of the form as shown in FIG. The other process conditions were the same, and the physical properties of the nonwoven fabric at this time and the separability during the lead plate operation and the permeability of the electrolyte solution were measured, and the results are shown in Table 1.

Comparative Example 1

In Example 1, the discharge amount was 250 g / min, the speed of the conveyor belt was 21 m / min, the embossing conditions were the upper and lower temperatures of 220 ° C., the linear pressure of 70 kg / cm, and other process conditions. Was prepared in the same manner. At this time, the physical properties of the nonwoven fabric and the separation performance during the lead plate operation and the electrolyte passing rate were measured, and the results are shown in Table 1.

Comparative Example 2

In Example 2, the speed of the conveyor belt was 21 m / min. The embossing conditions were the upper and lower temperatures of 240 ° C., and the linear pressure of 70 kg / cm. At this time, the physical properties of the nonwoven fabric and the separability during the lead plate operation and the passage of the electrolyte solution was measured, and the results are shown in Table 1.

Comparative Example 3

In Example 1, 51% of a low melting polyester having an intrinsic viscosity (IV) of 0.65 and a melting point of 220 ° C. was used, and the other process conditions were the same. At this time, the physical properties of the nonwoven fabric and the separability during the lead plate operation and the passage of the electrolyte solution was measured, and the results are shown in Table 1.

Table 1

Item Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Comparative Example 1 Comparative Example 2 Comparative Example 3 Nonwovens Weight (g / ㎡) 20.2 20.5 20.9 20.2 20.5 19.8 19.6 75 75 20 Thickness (mm) 0.10 0.11 0.09 0.11 0.09 0.11 0.11 0.257 0.270 0.10 Denia 2.9 2.8 2.7 2.9 2.8 2.9 2.8 2.9 3.1 2.8 Strength (kg / 5cm) MD 7 6 6 6 7 6 7 35 35 5 CD 3 4 3 3 4 3 3 23 19 2 Elongation (%) MD 18 17 18 17 20 25 22 40 35 16 CD 23 22 22 21 21 23 21 40 37 21 Tear strength (㎏) MD 0.5 0.4 0.5 0.4 0.6 0.7 0.6 2.1 2.2 0.4 CD 0.6 0.3 0.4 0.4 0.3 0.6 0.3 1.9 2.5 0.3 Lead plate separation Good Good Good Good Good Good Good Good Good Good Electrolyte permeability Good Good Good Good Good Good Good Bad Bad Good Lead plate separation workability Good Good Good Good Good Good Good Good Good Bad

The spunbond nonwoven fabric of the present invention has a dense structure to prevent the resin from flowing down, and is excellent in workability due to its shape stability and easy separation during lead plate processing, and has excellent permeability of the battery electrolyte to extend the life of the battery. Provided is a method for efficiently producing a polyester spunbond nonwoven fabric.

Claims (3)

The low melting point polyester having a melting point of 200 to 250 ° C. and the existing polyester having a melting point of 250 to 260 ° C. are respectively dried in separate dryers and the low melting point poly by a feed pump distributed through different melt extruders. The ratio of the ester and the existing polyester is 0-50% by weight: 100-50% by weight, and the draw amount is adjusted by the discharge amount and the air pressure of the ejector so that each filament fineness is 1-7de ＇, and then uniformly Of the spunbonded nonwoven fabric, characterized in that the filaments are mixed on a porous conveyor belt to form a web, and the web is thermally fused with an embossing roll having a bonding rate of 5 to 50%. Manufacturing method. The nonwoven fabric has a basis weight of 15 to 70 g / m 2, and an embossed form. ◆, ■, ★, ●, , A method for producing a polyester spunbond nonwoven fabric, characterized by having a mold. The method for producing a polyester spanbond nonwoven fabric according to claim 1 or 2, wherein the color of the product is white, black, or gray.