KR20110122566A - Manufacturing method of melt-blown fabric web and manufacturing apparatus thereof - Google Patents

Abstract

PURPOSE: An apparatus for fabricating meltblown fiber web is provided to obtain the meltblown fiber web with excellent bulky property. CONSTITUTION: An apparatus for fabricating meltblown fiber comprises a heating and extruding unit(2), a filament injection unit(3), a cross direction air injection unit(5A,5B), and a collection unit(7). The heating and extruding unit is use for heating thermoplastic resin and extruding the melted thermoplastic resin. The filament injection unit injects the thermoplastic resin along a first direction in a filament form. The collection unit collects filaments to form fiber web.

Description

Method for manufacturing melt blown fiber webs and apparatus for manufacturing the same {MANUFACTURING METHOD OF MELT-BLOWN FABRIC WEB AND MANUFACTURING APPARATUS THEREOF}

The present invention relates to a method for manufacturing a meltblown fibrous web and a manufacturing apparatus thereof, and more particularly, to a manufacturing method and apparatus for manufacturing a meltblown fibrous web with improved bulkiness.

The process of manufacturing meltblown fibrous web is a process of converting a thermoplastic resin such as polypropylene into filament fiber, and forming a wave to form a random wave in the filaments by spraying the filament vertically downward with a high temperature and high speed gas. And a fibrous web forming step of forming a fibrous web by collecting and laminating the wave-formed filaments.

Meltblown fibrous webs composed of fine fibers are widely used as materials, wipers, sorbents, insulations and sound insulation materials of various high performance filters because of their very large surface area.

However, there is a limitation in manufacturing a meltblown fibrous web that is light and excellent in sound absorption performance as a conventional method of manufacturing the meltblown fibrous web.

Accordingly, it is an object of the present invention to provide a manufacturing method and apparatus for producing a meltblown fibrous web which is light and excellent in sound absorption performance.

Another object of the present invention is to provide a manufacturing method and apparatus for producing a meltblown fibrous web having excellent bulky properties.

Another object of the present invention is to provide a manufacturing method and apparatus for producing a meltblown fibrous web having a large surface area of fine fibers.

According to the present invention, there is provided a melt blown fibrous web, comprising: a heat extruder for heating a thermoplastic resin to extrude a molten thermoplastic resin; A filament injection unit for injecting the molten thermoplastic resin along with a gas in a filament form along a first direction; A cross direction gas injection part for injecting gas in a direction intersecting with respect to the first direction toward the jetted filament so that the diameter of the filament is reduced; It can be achieved by a melt blown fiber web manufacturing apparatus comprising a collecting portion for collecting the filament via the cross-gas injection portion to form a fibrous web.

In addition, the cross-direction gas injection unit may be provided in a plurality and disposed on both sides with the injected filament therebetween to inject the gas in the opposite direction to each other.

Here, the plurality of cross direction gas injection parts may be disposed to face each other with the injected filaments interposed therebetween.

The cross direction gas injection parts may be provided in plural and spaced apart from each other along the first direction.

The apparatus may further include a gas suction unit for forming a flow of the filament along the first direction from the filament injection unit to the forge unit.

The object is, according to the present invention, a method for manufacturing a meltblown fibrous web, comprising: extruding a molten thermoplastic resin by heating the thermoplastic resin; Spraying the molten thermoplastic resin along with a gas in a filament form along a first direction; Spraying gas in a direction intersecting the first direction toward the jetted filament; And collecting the filaments to form a fibrous web, which can also be achieved by a method for producing a meltblown fibrous web.

The spraying the gas may include spraying the gas at a first angle with respect to the first direction toward the sprayed filament; And injecting gas at a second angle with respect to the first direction toward the injected filament.

In addition, according to the present invention, in the melt blown fibrous web, the melt blown filament is composed of a melt blown fibrous web, characterized in that the density is less than 50kg / ㎥.

According to the manufacturing method and apparatus for manufacturing the meltblown fiber web configured as described above has the following effects.

First, it is possible to manufacture a multi-blown fiber web excellent in light and excellent sound absorption performance.

Second, it is possible to manufacture a multi-blown fibrous web with excellent bulky properties.

Third, it is possible to produce a multi-blown fibrous web having a large surface area of microfibers.

Fourth, meltblown fibrous webs having a density of less than about 50 kg / m 3 can be produced.

Fifth, it is possible to produce a meltblown fibrous web excellent in washability, hygroscopicity and oil absorption.

1 is a schematic side view of a meltblown fiber web manufacturing apparatus according to a first embodiment of the present invention,
Figure 2 is a schematic side view of the main portion of the meltblown fiber web manufacturing apparatus according to a second embodiment of the present invention,
Figure 3 is a schematic side view of the main portion of the meltblown fiber web manufacturing apparatus according to a first embodiment of the present invention,
Figure 4 is a schematic side view of the main portion of the meltblown fiber web manufacturing apparatus according to a second embodiment of the present invention,
5 is a flow chart of a method for producing a meltblown fibrous web according to the present invention.

Hereinafter, a method of manufacturing a meltblown fiber web and a manufacturing apparatus thereof according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.

As used herein, the term "polyolefin" means any of a series of saturated open chain polymeric hydrocarbons consisting only of carbon and hydrogen atoms. Common polyolefins include polyethylene, polypropylene, polymethylpentene and various combinations of ethylene, propylene and methylpentene monomers.

The term "polypropylene" (PP) as used herein includes not only homopolymers of propylene, but also copolymers that are propylene units of at least 40% repeat units.

The term "polyester" as used herein is a concept comprising polymers which are linked by the formation of ester units and at least 85% of the repeating units are condensation products of dicarboxylic acids with dihydroxy alcohols. This includes aromatic, aliphatic, saturated and unsaturated diacids and dialcohols.

The term "polyester" as used herein includes copolymers and blends and their variants. A common example of polyester is polyethylene terephthalate (PET), a condensation product of ethylene glycol and terephthalic acid.

As used herein, the terms "meltblown fibers" and "meltblown filaments" refer to fibers or filaments formed by extruding a molten processable polymer through a plurality of fine capillaries with a high temperature and high speed compressor body.

Here, the capillary may be variously changed, such as a polygon, an asterisk including a circle, a triangle and a rectangle. Further, as an example, the high temperature and high speed compressor body can thin the filaments of the molten thermoplastic polymer material to reduce the diameter to about 0.5 to 10 micrometers. Meltblown fibers may be discontinuous fibers or combustion fibers. Meltblown filaments can be irregularly deposited on the surface of the collecting device, which will be described later, to form a web of randomly dispersed fibers.

As used herein, the term “spunbond” fiber refers to a fibrous web made by a method of drawing a plurality of fine diameter filaments extruded through a capillary tube using a hot tube.

Spunbond fibers are continuous in the longitudinal direction of the filaments and have an average diameter of the filaments greater than about 5 μm. Spunbond nonwovens or nonwoven webs are formed by irregularly placing spunbonds on a collecting surface, such as a porous screen or belt.

As used herein, "nonwoven, fibrous web and nonwoven web" means a structure composed of individual fibers, filaments or yarns in which the individual fibers, filaments or yarns are arranged in an irregular manner without pattern as opposed to the knitted fabric to form a planar material. do.

 Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Melt blown fiber web manufacturing apparatus 100 according to a first embodiment of the present invention, as shown in Figure 2, the heat extruded portion 2 for heating the thermoplastic resin 1 to extrude the molten thermoplastic resin ; A filament injection unit (3) for injecting the molten thermoplastic resin together with a gas along its own weight direction (A) in the form of a filament (6); Intersecting gas injection parts (5A, 5B) for injecting gas in a direction intersecting said magnetic weight direction (A) toward said injected filament (6) to twist said filament (6); And a collecting part 7 which collects the filaments 6 via the cross-gas injection parts 5A and 5B to form a fibrous web 11.

Here, the filament injection unit 3 may inject the filament and the gas along any first direction other than the self-weight direction (A).

The thermoplastic polymer resin 1 injected into the heat extrusion part 2 may include polyolefin or polyester or other known thermoplastic polymer resin. The injected polymer resin 1 is heated by the heat extrusion part 2, converted into a molten state, and extruded.

In addition, inorganic and / or organic additives may be added to the thermoplastic polymer resin 1 in addition to the above-described polyolefin or polyester or other known thermoplastic polymer resins. By adding such inorganic and / or organic additives, the spinning viscosity of the thermoplastic polymer resin in the molten state may be adjusted, or the physical properties of the filament, that is, specific gravity and hardness may be adjusted. In addition, the filtration efficiency and durability of the filter may be improved by adding the inorganic and / or organic additives. The type and ratio of such additives are well known to those skilled in the art, and thus detailed descriptions thereof will be omitted.

The filament injection part 3 is an inlet part 3B into which the molten thermoplastic polymer resin 1 supplied from the heat extrusion part 2 is introduced, and the molten thermoplastic polymer introduced from the inlet part 3B. A chamber 3C in which the resin 1 is temporarily stored, and a plurality of filament injection pipes 3A formed from the chamber 3C toward the collecting unit 7 are included.

The plurality of filament injection pipes 3A may be provided in various forms such as polygons, stars, and the like including cylinders, triangles, and quadrangles.

In addition, although the filament injection pipe 3A is shown as one in FIG. 1, it is actually arranged in multiple numbers along the direction perpendicular | vertical to the surface of FIG.

The molten thermoplastic polymer 1 temporarily stored in the chamber 3C is converted into a filament form while passing through the filament injection unit 3 and discharged in the own weight direction A. Here, the chamber 3C is pressurized therein by a gear pump not shown, and the filament is injected by the pressure. Of course, in addition to the gear pump described above to pressurize the inside of the chamber 3C, various pressurizing means such as a hydraulic pump and a rotary pump may be employed.

Here, the filament injection unit 3 is a downward gas injection unit for injecting gas toward the filament to extend the filament flowing out through the filament injection pipe (3A) in the longitudinal direction (self-weight direction (A)) (4A, 4B).

As shown in FIG. 1, the lower gas injection parts 4A and 4B may be symmetrically disposed at left and right sides with respect to the filament injection pipe 3A.

In addition, the gas injection nozzles 12 and 13 of the downward gas injection units 4A and 4B may be disposed to be inclined with respect to the self-weight direction A. The gas injection nozzles 12 and 13 may be provided so that the force of the injection direction of the gas injected from the gas injection nozzles 12 and 13 is substantially parallel to the self-weight direction A. FIG. Here, when the gas injection nozzles 12 and 13 are provided symmetrically with respect to the longitudinal direction of the filament injection pipe 3A, a force of the injection direction of the gas injected from the gas injection nozzles 12 and 13 is provided. This will be generally parallel to the magnetic weight direction A.

The downward gas injection units 4A and 4B inject gas through the gas injection nozzles 12 and 13. Accordingly, the filament 6 discharged through the filament injection pipe 3A due to the collision with the gas is elongated in the longitudinal direction and the diameter thereof is reduced.

Here, the gas may be a gas of high temperature and / or high speed. Thereby, in the case of high temperature and / or high speed gas, the diameter of the filament 6 can be further reduced.

Here, the gas may be air in the atmosphere. Of course, the gas may be a gas composed of various mixing ratios of nitrogen, oxygen, and water vapor in the gas state, or may be made of only a single inert gas. The type of gas may be changed in various ways.

Here, the high temperature is a temperature equal to or higher than room temperature (25 degrees Celsius) and a temperature at which the filament 6 can be elongated in the longitudinal direction is sufficient. Thus, the temperature of the gas injected by the filament injection unit 3 can be changed to various temperatures by the designer's choice.

In addition, the high speed means a speed that the gas to be injected can be injected with a predetermined direction. The velocity of the gas to be injected can be changed to various values by the designer's choice as well as the temperature.

On the other hand, the cross direction gas injection unit (5A, 5B) injects gas in a direction intersecting the magnetic weight direction (A) toward the filament (6) injected through the filament injection unit (3).

The cross direction gas injection parts 5A and 5B also extend in a direction perpendicular to the ground of FIG. 1 like the filament injection portion 3 so as to inject a gas by a predetermined width in a direction perpendicular to the ground. Can be.

Here, the gas ejection width in the direction perpendicular to the ground of the crossover gas ejection portions 5A and 5B is greater than the width of the filament 6 ejected by the filament ejection portion 3 in the ground direction. The same or wider is preferable.

Here, although the pair (two) is shown as the said cross-direction gas injection parts 5A and 5B in FIG. 1, it may be provided as one in some cases.

Here, the gas may be high temperature and / or high speed air. Accordingly, as the hot high-speed air and the injected filament 6 collide with each other, the diameter of the filament 6 is reduced by 1 to 60% and the length is increased by 1 to 60%, and the length of the filament 6 is increased. 1 to 60% increase in surface area. In addition, the filament 6 has a form twisted like a coil spring shape around the magnetic weight direction A.

Here, the components of the gas and the kind of gas contained in the gas may be variously changed.

In addition, the cross direction gas injection parts 5A and 5B and the downward gas injection parts 4A and 4B may inject gas of the same component and type. However, the pressure and temperature of the injected gas may vary.

Here, the cross direction gas injection units 5A and 5B have injection pipes 14 and 15 for injecting the gas, respectively. The injection pipes 14 and 15 may be provided as nozzles.

The cross direction gas injection parts 5A and 5B are perpendicular to the injection pipes 14 and 15 of the respective cross direction gas injection parts 5A and 5B from the end of the filament injection pipe 3A. It is preferable that the distances H1 and H2 to A) are different from each other. This is because when the vertical distances H1 and H2 to the respective injection pipes 14 and 15 are the same, the injected gases may cancel each other out.

Of course, in some cases, for example, even when the vertical distances H1 and H2 are equal to each other, the injection speed of one of the gas injection units 5A and 5B is larger than the injection speed of the other gas injection units 5A and 5B. Even though the vertical distances H1 and H2 are the same, the degree of twist, length and surface area of the filament 6 can be increased and the diameter can be reduced.

Here, the cross-gas injection portion 5A on the left side shown in FIG. 1 is inclined by the first angle θ1 in the counterclockwise direction based on the extension line B in the longitudinal direction of the filament injection pipe 3A. The gas in the direction toward the filament (6).

In addition, the cross-direction gas injection portion 5B on the right side of the gas in the direction inclined by the second angle θ2 in the clockwise direction with respect to the extension line B in the longitudinal direction of the filament injection pipe (3A). It can spray toward the filament 6.

Here, the first angle θ1 and the second angle θ2 may be 90 degrees. Of course, the first angle θ1 and the second angle θ2 may be any angle in the range of 1 degree or more and 179 degrees or less. In some cases, the first angle θ1 and the second angle θ2 may be different from each other.

The horizontal gas injection sections 5A and 5B have a horizontal distance of 0.5 to 50 cm, preferably 0.5, from the ends of the injection pipes 14 and 15 to the longitudinal extension line B of the filament injection pipe 3A. May be placed in the range of ˜10 cm. Of course, this arrangement is just one example.

In addition, the vertical direction of the cross-gas injection portion (5A, 5B) from the injection pipe (14, 15) to the end of the filament injection pipe (3A) may be arranged in 1 ~ 50cm, preferably 1 ~ 30cm have. Of course, the vertical distance may be changed in various ways.

The filament 6 may be twisted to some extent by the gas injection units 4A and 4B below the injection unit 3, but the cross direction gas injection units 5A and 5B may be twisted. 5B) maximizes the twist of the filament 6 even more. Accordingly, the diameter of the filament 6 can be further reduced and its length can also be extended. As the filaments 6 are made more twisted, the fibrous web, which is a stack of such filaments 6, can greatly improve its bulkyness.

Here, bulky means bulky compared to the weight, thereby making it possible to produce a lighter fiber web.

The function of the cross direction gas injection units 5A and 5B will be described in more detail as follows.

The filament 6 injected from the filament injection part 3 to the collecting part 7 rapidly cools the surface when it comes into contact with air at room temperature between the filament injection part 3 and the collecting part 7. This causes the filament 6 to harden so that its appearance, such as diameter, length and surface area, is nearly impossible to deform.

Therefore, before the filament injected from the filament injection unit 3 drops below the deformable temperature, the hot and / or high speed gas is injected into the filament 6 in the cross direction to collide with the filament 6. The heat energy and the collision energy are transmitted to the filament so that the diameter of the filament 6 is not only thinner but also more twisted.

Here, the gas velocity injected from the cross direction gas injection units 5A and 5B is in the range of 5 to 90% of the gas velocity injected from the downward gas injection units 4A and 4B of the filament injection unit 3. It is desirable to have. Because, when the transverse gas velocity injected by the cross-gas injection portion 5A, 5B is similar to or greater than the longitudinal gas velocity injected by the downward gas injection portion 4A, 4B (90 This is because it is difficult to maintain the gas flow from the filament injection part 3 to the collection part 7. In addition, when the transverse gas velocity injected by the cross-gas injection portions 5A and 5B is too small (less than 5%) relative to the longitudinal gas velocity injected by the downward gas injection portions 4A and 4B. This is because it is not possible to transmit sufficient impact energy to modify the surface of the filament 6.

The gas temperature sprayed by the cross-directional gas injection units 5A and 5B is higher as the distance from the filament injection unit 3 (distance in the direction of the extension line B in the longitudinal direction) is higher under the same speed condition. desirable. This is because, as described above, the filament at a position far away from the filament injection portion 3 is in contact with the outside air and thus is cooled more, so that more heat energy is required to deform the outer shape of the filament 6.

Here, the filaments 6 hit by the gas stream injected by the cross-directional gas injection parts 5A and 5B are collected in the collecting part 7 at a constant weight. In this case, a gas suction unit 8 to be described later may be disposed below the collecting unit 7. As a result, even when gas is injected in the cross direction by the cross direction gas injectors 5A and 5B, a constant air flow from the filament injector 3 to the gas intake unit 8 is formed. For this reason, the feed path of the filament 6 becomes substantially constant.

On the other hand, the collecting portion 7 is a belt 7c on which the filaments 6 are laminated via the cross-gas injection portions 5A and 5B, and a pair of rollers 7a for driving the belt 7c. , 7b).

In some cases, the collecting part 7 may be provided as a rotating cylindrical drum.

In addition, the melt blown fibrous web manufacturing apparatus 100 according to the present invention, the gas suction unit disposed in the lower portion of the filament injection unit 3 so that the conveying direction of the filament ejected from the injection unit 3 ( 8) may be further included.

The gas suction part 8 sucks the gas injected from the downward gas injection units 4A and 4B of the injection part 3. Accordingly, the conveying direction of the filament to be conveyed due to the flow of the injected high-speed gas can also be maintained substantially constant. Here, the conveying direction of the filament is generally parallel with the longitudinal extension line (B) of the filament injection pipe 3A of the filament injection unit (3).

Here, the filament injection pipe (3A) may be arranged such that the longitudinal direction thereof is substantially the self-weight direction (A). In addition, the direction in which the filament 6 injected by the filament injection unit 3 may be a self-weight direction A. In some cases, the jet direction of the filament 6 may not be the self-weight direction A.

Here, the injection direction of the filament 6 injected by the filament injection unit 3 may be referred to as a first direction.

In addition, the meltblown fiber web manufacturing apparatus 100 according to the present invention may further include a winding portion 9 for winding the fiber web collected by the collecting portion 7.

The winding 9 may be provided with a pair of rollers 9a and 9b which rotate to face each other. Any one of the pair of rollers 9a and 9b may receive the fibrous web 11 collected on the belt 7c of the collecting part 7 and wind the fibrous web 11 on the outer surface thereof. .

The winding unit 9 is merely an example and may be variously changed, and in some cases, may be omitted.

As described above, when manufacturing the fibrous web with the meltblown fibrous web manufacturing apparatus 100 according to the present invention, it is possible to improve the bulky characteristics of each of the filaments (6). In other words, the surface area of each filament 6 can be made wider, the length of each filament 6 can be increased, and the diameter thereof can be reduced. The fibrous web formed by laminating the filaments 6 having deformed properties also has excellent bulky properties. In other words, the fibrous web is large in volume and surface area but light in weight.

This means that the surface area per unit area of the filament increases and the weight per unit area decreases. Due to such characteristics, it is possible to produce a fibrous web excellent in sound absorption, heat insulation, hygroscopicity, oil absorption and washing ability.

Here, a spunbond web (not shown) having relatively high rigidity is formed on both surfaces or one surface of the meltblown fiber web 11 manufactured by the manufacturing apparatus 100 by a known method such as high temperature roll calendering. Can be combined. In some cases, a spunbond web may be bonded to the meltblown fibrous web 11 using a saturated steam chamber.

On the other hand, the melt blown fiber web manufacturing apparatus 100a according to the second embodiment of the present invention, as shown in Figure 2, compared to the first embodiment described above cross-direction gas injection unit (21A, 21B) It is different and the rest of the configuration is the same.

Compared to the cross direction gas injection parts 5A and 5B of the first embodiment, the cross direction gas injection parts 21A and 21B of the second embodiment are farther from each other in the direction of the longitudinal extension line B of the filament injection pipe 3A. Are spaced apart.

The cross direction gas injection parts 21A and 21B of the second embodiment are the first cross direction gas powder spaced apart from the filament injection part 3 by the first distance in the direction of the longitudinal extension line B of the filament injection pipe 3A. And a second cross direction gas injection part 21B spaced apart by a second distance different from the first distance in the direction of the dead portion 21A and the longitudinal extension line B. FIG.

In addition, the cross direction gas injection parts 21A and 21B are disposed to face each other based on the longitudinal extension line B. That is, the gas injection directions of the cross direction gas injection parts 21A and 21B are arranged to be opposite to each other.

The first cross direction gas injection part 21A includes a first injection pipe 22 which injects gas in a direction inclined by a first angle θ1 in a counterclockwise direction based on the longitudinal extension line B. .

The second cross direction gas injection part 21B includes a second injection pipe 23 for injecting gas in a direction inclined at a second angle θ2 in a clockwise direction with respect to the longitudinal extension line B.

Here, the first angle θ1 and the second angle θ2 may be the same or may be different in some cases.

On the other hand, the melt blown fiber web manufacturing apparatus 100b according to the third embodiment of the present invention, as shown in Figure 3, compared with the first embodiment described above is different cross-direction gas injection unit (50A, 50B) ). Since the rest of the configuration is the same, it will be omitted for convenience of description.

The cross direction gas injection parts 50A and 50B of the third embodiment are divided into two cross direction gas injection parts 50A and 50A along the longitudinal extension line B direction of the filament injection pipe 3A of the filament injection part 3. 50B) are arranged side by side.

In more detail, two cross-gas injection parts 50A, 50B are arranged at different distances from the filament injection part 3 along the longitudinal extension line B direction.

The angle formed by the longitudinal extension line B and the gas injection direction in each of the cross direction gas injection units 50A and 50B may be variously changed.

Meanwhile, the meltblown fiber web manufacturing apparatus 100c according to the fourth embodiment of the present invention also has a different cross directional gas as compared to the first embodiment as shown in FIG. 4 as compared to the first embodiment. Injection parts 500A and 500B.

The cross direction gas injection parts 500A, 500B, and 500C of the fourth embodiment include a total of three cross direction gas injection parts 500A, 500B, and 500C.

Two intersecting gas injection parts 500A and 500C are disposed on one side of the filament injection pipe 3A in the longitudinal extension line B, and the other one intersecting gas injection part 500B is disposed on the other side of the filament injection pipe 3A. .

The angle formed by the gas direction injected from each of the cross direction gas injection parts 500A, 500B, and 500C and the longitudinal extension line B may be variously changed. In other words, each of the cross direction gas injection parts 500A, 500B, and 500C respectively directs the gas toward the filament 6 injected by the filament injection part 3 at various angles with respect to the longitudinal extension line B. Can spray

Also, from the ends of the filament injection pipes 3A to each of the cross direction gas injection parts 500A, 500B, and 500C so that the gases injected from the cross direction gas injection parts 500A, 500B, and 500C do not cancel each other. It is preferable that the distance in the longitudinal extension line B direction is different from each other.

The cross-direction gas injection units 21A, 21B, 50A, 50B, 500A, 500B, and 500C of the second to fourth embodiments described above are merely examples and may be changed in various forms.

In more detail, the number of gas injection parts included in the cross direction gas injection part, the gas injection angle of the cross direction gas injection part, the vertical distance (self-weight direction) distance from the filament injection part 3 of the cross direction gas injection part, or By changing at least one of the factors such as the horizontal distance, the pressure and the temperature of the gas to be injected, the diameter, the surface area and the degree of twist of the filament 6 can be arbitrarily changed.

The characteristics and sound absorption performance of the fibrous web prepared according to the embodiment of the present invention were tested while varying the experimental conditions, and the measured experimental results are as follows.

The diameter of the filament was randomly extracted approximately 10 filaments from the test specimen fibrous web, each filament was measured by an optical microscope (SEM), and the average value was expressed using a micrometer (μm) unit. The weight of the specimen is a measure of the weight per unit area. Three samples of 300 x 300 mm were taken at an arbitrary position, and the weight was measured and converted to 1 m 2 of weight. The thickness of the specimen was 100 x 100 mm. The hawk was placed on a horizontal specimen support and the thickness was measured with a vernier caliper to calculate the average. In addition, the sound absorption performance test of the fibrous web was measured by a simple liver chamber method (ALPHA CABIN) according to MS 200-39. However, each specimen was tested without applying a separate pressure other than atmospheric pressure.

[Experimental Condition 1]

The detailed configuration of the manufacturing apparatus 100, which is the same as that of the first embodiment according to FIG. 1, is as follows.

The diameter of each of the plurality of filament injection pipes 3A arranged along the surface direction is 0.38 mm, and the number thereof is 32 pieces / inch. Testing was carried out using HP461Y grade, a polypolyamide homopolypropylene with a Melt Index (MI) of 1300 g / 10 min. To prevent deterioration of the polymer, 0.2 wt% of a thermal stabilizer and an antioxidant were added to induce stable filament injection. The polymer was dried at a temperature of 100 ° C. prior to the test to bring the moisture content below 50 ppm.

In addition, the filament injection unit 3 is heated to 240 ° C., and the gas temperature and velocity to be injected from the downward gas injection units 4A and 4B inside the filament injection unit 3 under conditions of 245 ° C. and 35 m / sec, respectively. It was. In addition, the length of the two gas injection nozzles 12 and 13 provided 10 mm downward from the opening of the filament injection tube 3 in the direction of the surface of the filament injection unit 3 is approximately 89 inches. The length was set equal to the length in the rough direction.

The two gas injection nozzles 12 and 13 are arranged at an angle of 40 degrees to the left and the right, respectively, based on the longitudinal extension line B of the injection pipe 3, and the angle between the two gas injection nozzles 12 and 13 is different. Was set at 100 degrees.

The distance in the self-weight direction A between the filament injection part 3 and the collection part 7 is 85 cm, and the injection pipe 14 of the filament injection part 3 and the first cross direction gas injection part 5A is provided. The distance in the magnetic weight direction A is 10 cm, the distance in the magnetic weight direction A between the first cross direction gas injection part 5A and the second cross direction gas injection part 5B is 3 cm, and the cross direction gas injection parts 5A, respectively. The distance (D of FIG. 2) between the longitudinal extension line B of the filament injection pipe 3A from 5B) was set to 2 cm, and the first angle θ1 and the second angle θ2 were set to 90 degrees.

Further, the length in the transverse direction of the self-weight direction A of each of the injection pipes of the cross direction gas injection units 5A and 5B is 2 cm, and the surface of the cross direction gas injection units 5A and 5B. The length in the direction was also the same at 89 inches.

The gas velocity injected from the cross direction gas injection parts 5A and 5B was 17.5 m / sec, and the temperature of the gas was 160 degrees Celsius. The filament 6 injected from the filament injection part 3 is laminated with the filament 6 in the collecting part 7 which rotates in the winding part 9 direction at a speed of 3.2 m / min, the fiber web of 200 g / ㎡ Was formed and wound up.

[Experimental Condition 2]

Compared with the experimental condition 1 described above, the melt blown fibrous web was manufactured by adjusting only the speed and temperature conditions of the cross-direction gas injection parts 5A and 5B. The velocity of the gas injected from the cross-directional gas injection units 5A and 5B was 21 m / sec, and the gas temperature was 180 ° C.

[Experimental Condition 3]

Compared to Experimental Condition 1, the angle (θ1, θ2) formed between the gas ejection angles of the cross-direction gas ejection sections 5A and 5B of FIG. All were adjusted to 170 degrees to prepare a meltblown fibrous web.

Here, when the angle is 170 degrees, the gas direction injected from each of the cross direction gas injection units 5A and 5B injects gas in an upward direction to prevent the fall of the filament 6 injected from the filament injection unit 3. Done. In this case, since the gas injection speeds of the cross direction gas injection parts 5A and 5B are smaller than the gas injection speeds injected by the filament injection part 3, that is, the downward gas injection parts 4A and 4B, the filament ( 6) does not affect the movement in the collecting part 7 direction.

[Experimental Condition 4]

Compared to Experimental Condition 1, the angles (θ1 and θ2) formed by the gas ejection angles of the cross-direction gas ejection units 5A and 5B of FIG. 1 and the longitudinal extension line B of the filament injection tube 3A under the same spinning condition. The bays were all adjusted to 130 degrees to produce meltblown fibrous webs.

[Experimental Condition 5]

Compared to Experimental Condition 1, the angle formed by the gas ejection angles of the gas ejection units 5A and 5B in Fig. 1 and the longitudinal extension line B of the filament injection pipe 3A under the same spinning condition was obtained. The bays were all adjusted to 50 degrees to produce a meltblown fibrous web.

[Experimental Condition 6]

Compared to Experimental Condition 1, the angle formed by the gas ejection angles of the gas ejection units 5A and 5B in Fig. 1 and the longitudinal extension line B of the filament injection pipe 3A under the same spinning condition was obtained. The bays were all adjusted to 10 degrees to produce meltblown fibrous webs.

[Experimental Condition 7]

It was tested using the manufacturing apparatus of the second embodiment shown in FIG.

The distance in the self-weight direction A between the filament injection part 3 and the collecting part 7 is 85 cm, and the injection pipe 51 of the filament injection part 3 and the first cross direction gas injection part 50A is provided. The distance in the magnetic weight direction (A) is 2 cm, the distance in the magnetic weight direction (A) between the first cross direction gas injection part 50A and the second cross direction gas injection part 50B is 15 cm, and the angle with respect to the longitudinal extension line B. The injection angles [theta] 1 and [theta] 2 of the cross direction gas injection parts 50A and 50B were set to 90 degree | times. The air velocity injected from each of the cross-directional gas injection units 50A and 50B was 17.5 m / sec, and the air temperature was 160 ° C. The remaining conditions are the same as experimental condition 1.

[Experimental Condition 8]

As shown in FIG. 4, the test was performed by arranging three cross-fuel gas injection units 500A, 500B, and 500C.

The distance in the self-weight direction A between the filament injection portion 3 and the collection portion 7 is 85 cm, from the filament injection portion 3 to the injection pipe 501 of the first cross direction gas injection portion 500A. The distance in the magnetic weight direction A is 10 cm, the distance in the magnetic weight direction A between the first cross direction gas injection part 500A and the second cross direction gas injection part 500B is 3 cm, and the second cross direction gas injection part 500B. ) And the third cross-direction gas injection unit 500C has a distance of 3 cm in the self-weight direction A, and the injection angles of the gas injection units 500A, 500B, and 500C in the cross direction with respect to the longitudinal extension line B are all 90 degrees. Set to road. The air velocity injected from each of the cross-directional gas injection units 50A and 50B was 17.5 m / sec, and the air temperature was 160 ° C. The remaining conditions are the same as experimental condition 1.

[Experimental Condition 9]

Compared to Experimental Condition 1, the melt-blown fibrous web was adjusted by adjusting the gas velocity at 1.8 m / sec and the gas temperature at 25 ° C. under the same spinning conditions as shown in FIG. 1. Prepared. The remaining conditions are the same as experimental condition 1.

Comparative Example 1

Under the same conditions as the experimental condition 1, only the cross direction gas injection parts 5A and 5B were removed, and filaments were laminated on the collecting part 7 to form a fiber web of 200 g / m 2 and wound up.

The experimental results according to the above experimental conditions are as follows.

TABLE 1

[Table 2] Sound absorption performance evaluation results

Table 1 measures the mass and volume of the fibrous web and the diameter of the filament prepared by the experimental conditions 1 to 9 and the conditions of Comparative Example 1. Comparing the filament diameter and the fibrous web volume of the experimental conditions 1 to 9 and the result of Comparative Example 1, the effect due to the use of the cross-directional gas injection unit of the present invention can be clearly confirmed.

The diameter of the filament was reduced by about 20 to 70% compared to Comparative Example 1, while the thickness of the final fibrous web was increased by up to 600% by the use of the cross-gas injection section. This is believed to be the result of the reduction of the diameter of the filament and the conversion of the filament into a more twisted amorphous form.

In addition, the experimental results of the experimental conditions 1, 2 and 9 show that, in the same arrangement of the cross-gas injection unit, the diameter and diameter of the filament decrease and On the contrary, increasing the temperature and pressure of the gas increases the diameter of the filament and decreases the volume of the fibrous web.

Experimental conditions 3 to 6 measure the change in the diameter of the filament and the fiber web only by changing the angle (gas injection angle) of the gas injection direction injected from the cross direction gas injection unit in the same first embodiment.

Even if all other conditions are the same, only by changing the gas injection angles θ1 and θ2 can the developer develop the final product with the desired specifications. Here, as the gas ejection angles θ1 and θ2 in the cross direction move away from 90 degrees, that is, closer to the self-weight direction, the diameter of the filament decreases and the volume of the fibrous web increases.

This is because the filament 6 emitted from the filament injection pipe 3 is shorter in time, that is, the filament loses its own thermal energy as the gas injection angles θ1 and θ2 in the cross direction are closer to the self-weight direction A. This is considered to be caused by collision with the cross-gas stream at.

The best results were obtained under experimental condition 8, which shows that the amount of gas stream along with the temperature and velocity of the gas stream applied to the filament is an important factor in the modification of the filament.

Here, when using the multi-blown fiber web manufacturing apparatus according to the present invention it can be seen that the melt-blown fibrous web (11) having a bulky (density of less than 50kg / ㎥) can be produced.

On the other hand, Table 2 is measured the sound absorption performance of the fibrous web prepared under the experimental conditions 1 to 9 and the experimental conditions of Comparative Example 1, the data shows the sound absorption rate of the material. Table 2 shows the sound absorption performance data measured for each experimental condition with the frequency (Hz) as the horizontal axis. The larger the value (absorption rate), the greater the sound absorption performance. In Table 2, "Condition 1 (2, 3, ..., 9)" corresponds to "Experimental Condition 1 (2, 3, ..., 9)" in Table 1, respectively.

The sound absorbing performance of the fibrous web was better as the diameter of the filament was smaller and the volume of the fibrous web was larger. Experimental conditions 1 to 8 were evaluated to have an excellent sound absorption evenly, and in the case of experimental conditions 9 and Comparative Example 1 was measured that the sound absorption rate of the material is very low despite the weight of the same 200g. That is, in the experimental conditions 1 to 9 according to the present invention compared to Comparative Example 1, the sound absorption performance was measured to improve from as little as 1.5 times to as large as 3.5 times according to the frequency.

Therefore, it can be seen that by using the meltblown fiber web manufacturing apparatus of the present invention, it is possible to produce a material having superior bulky characteristics and excellent sound absorption ability compared to existing products.

Hereinafter, a method of manufacturing a meltblown fiber web according to the present invention will be described with reference to FIG. 5.

First, the thermoplastic resin is heated to extrude the molten thermoplastic resin (S10).

Next, the molten thermoplastic resin is sprayed along with the gas in the form of filament along the first direction (S20). Here, the first direction may be a self-weight direction. In addition, the filament may be injected together with the gas at a high temperature and / or high speed.

Next, the gas is injected in a direction crossing the first direction toward the injected filament (S30).

Accordingly, the diameter of the filament is reduced and its length and surface area are increased. This increases the bulkiness of the individual filaments.

Next, the bulky filament is collected to form a fibrous web (S40).

The fiber web thus formed is wound (S50).

The spraying gas in the cross direction may include: spraying gas at a first angle with respect to the first direction toward the sprayed filament; And

And spraying gas at a second angle with respect to the first direction toward the injected filament.

Here, the first angle and the second angle may be the same value or different values.

On the other hand, the above embodiments are merely exemplary, and those skilled in the art may have various modifications and other equivalent embodiments therefrom.

Accordingly, the true scope of protection of the present invention should be determined by the technical idea of the invention described in the following claims.

100, 100a, 100b, 100c: melt blown fiber web manufacturing apparatus
1: Thermoplastic Polymer Resin 2: Heat Extrusion
3: filament injection part 3A: filament injection pipe
3B: Inlet 3C: Chamber
4A, 4B: Downward gas jet 12, 13: Gas jet nozzle
5A, 5B: Cross-direction gas injection section 14, 15: Injection pipe
6: filament 7: collector
8: Gas suction part 9: Gun holder
11: fiber web
21A, 21B, 50A, 50B, 500A, 500B, 500C: Cross direction gas jet
22, 23, 51, 53, 501, 502, 503: injection pipe

Claims (8)

In the apparatus for producing a melt blown fiber web,
A heat extrusion part for heating the thermoplastic resin and extruding the molten thermoplastic resin;
A filament injection unit for injecting the molten thermoplastic resin together with a gas along a first direction in the form of a filament;
A cross direction gas injection part for injecting gas in a direction intersecting with respect to the first direction toward the jetted filament so that the diameter of the filament is reduced;
And a collecting part for collecting the filament via the cross-gas injection part to form a fibrous web. The method of claim 1,
The cross-direction gas injection unit is provided with a plurality of melt blown fiber web manufacturing apparatus, characterized in that disposed on both sides with the injected filament interposed so as to inject the gas in the opposite direction to each other. The method of claim 2,
The plurality of cross-gas injection portion is melt blown fiber web manufacturing apparatus, characterized in that disposed opposite to each other with the filament to be injected therebetween. The method of claim 1,
Melt blown fiber web manufacturing apparatus characterized in that the plurality of cross-gas injection portion is provided spaced apart from each other along the first direction. The method according to any one of claims 1 to 4,
And a gas suction part for forming a flow of the filament along the first direction from the filament injection part to the forge part. In the manufacturing method of the melt blown fiber web
Heating the thermoplastic resin to extrude the molten thermoplastic resin;
Spraying the molten thermoplastic resin along a first direction in the form of a filament;
Spraying gas in a direction intersecting the first direction toward the jetted filament;
And collecting the filaments to form a fibrous web. The method of claim 6,
Injecting the gas,
Spraying gas at a first angle with respect to the first direction toward the injected filament; And
And spraying gas at a second angle with respect to the first direction toward the jetted filaments. For meltblown fiber webs,
Melt blown filaments, characterized in that the density is less than 50kg / ㎥ melt blown fiber web.

Images