KR101902522B1 - Hybrid nonwovens composed of polypropylene long-fiber nonwoven layer and polyethylene long-fiber nonwoven layer and method for producing the same - Google Patents

Abstract

The present invention relates to a hybrid nonwoven fabric having a polyethylene long-fiber nonwoven fabric layer bonded to the upper surface or both upper and lower surfaces of a polypropylene long-fiber nonwoven fabric layer, and a method for producing such a nonwoven fabric, wherein a polypropylene long- After the long fibrous nonwoven fabric layer is formed, the polypropylene long fibrous nonwoven fabric layer and the polyethylene long fiber layer are bonded to each other to obtain a hybrid nonwoven fabric having high strength of polypropylene and soft touch of polyethylene.
The method for producing a hybrid nonwoven fabric according to the present invention comprises the steps of: (S1) forming a polypropylene long fiber nonwoven fabric layer; (S2) forming a polyolefin filament nonwoven fabric layer on a polypropylene long fiber nonwoven fabric layer; And (S3) a step in which the polypropylene long-fiber nonwoven fabric layer and the polyethylene long-fiber nonwoven fabric layer are bonded to each other by a pressing roller.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hybrid nonwoven fabric composed of a polypropylene long-fiber nonwoven fabric layer and a polyethylene long-fiber nonwoven fabric layer,

The present invention relates to a hybrid nonwoven fabric comprising a polypropylene long-fiber nonwoven fabric layer and a polyethylene long-fiber nonwoven fabric layer, and a method for producing the same. More specifically, the present invention relates to a sanitary product such as a diaper, a sanitary napkin, A nonwoven fabric comprising a polypropylene long-fiber nonwoven fabric layer and a polyethylene long-fiber nonwoven fabric layer which can be used in various applications, and a method for producing the same.

As life becomes more leisurely and richer, disposable products are being used for various applications and consumed. Polypropylene polymers, which are economical and have excellent fiber forming properties, are the most widely used raw materials for disposable products. However, a disposable product made of a polypropylene nonwoven fabric may give an uncomfortable feeling when used in contact with human skin. In order to prevent such an unpleasant feeling, a polyethylene terephthalate nonwoven fabric having a relatively soft touch is used to produce a disposable product used in a portion contacting the skin, thereby realizing a soft touch.

For example, Korean Patent Laid-Open Publication No. 2013-0015078 discloses a core-sheath type composite long-fiber nonwoven fabric composed of a polypropylene polymer core and a polyethylene polymer sheath as the uppermost layer and a meltblown or spunbond Discloses a multilayer nonwoven fabric produced by laminating a nonwoven fabric. However, the apparatus for producing the core-sheath type composite long-fiber nonwoven fabric is complicated and the strength of the polypropylene polymer in the core portion is low due to low fineness of the core portion. When the cross-section of the sheath portion and the core portion is uneven, There is a problem that the bonding strength with the layer is lowered.

Korean Patent Laid-Open Publication No. 2010-0075660 discloses a nonwoven fabric manufacturing method in which three nonwoven fabrics made of different resins are laminated in three layers and heated to a temperature above the heat-resistant temperature by using a high-pressure steam sterilizer to heat- . However, since the three-dimensional structure of the nonwoven fabric fiber can be remained as it is bonded with heat without applying mechanical pressure, there is a problem that the breaking strength is lowered and much energy is required.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a hybrid nonwoven fabric having soft and soft tactile properties by bonding a polyethylene filament nonwoven fabric layer and a polypropylene nonwoven fabric nonwoven fabric layer, .

In order to achieve the above object, the present invention provides a nonwoven fabric comprising a polyethylene nonwoven fabric layer composed of filaments having a diameter of 10 to 30 占 퐉 on one surface or both upper and lower surfaces of a polypropylene nonwoven fabric layer composed of filaments having a diameter of 10 to 30 占 퐉 , An embossing ratio of 5 to 30%, and a unit weight of 5 to 200 g / m < 2 >.

A method for producing a hybrid nonwoven fabric comprising a polypropylene long-fiber nonwoven fabric layer and a polyethylene long-fiber nonwoven fabric layer according to the present invention,

(S1) forming a polypropylene long fiber nonwoven fabric layer;

(S2) forming a polyolefin filament nonwoven fabric layer on one side or both sides of a polypropylene nonwoven fabric nonwoven fabric layer; And

(S3) bonding the polypropylene long-fiber nonwoven fabric layer and the polyethylene long-fiber nonwoven fabric layer to each other by a pressing roller.

According to the present invention, a hybrid nonwoven fabric in which a polyethylene nonwoven fabric layer is adhered to an upper surface or both upper and lower surfaces of a polypropylene nonwoven fabric layer has soft touch, excellent air permeability, and high strength. Therefore, the hybrid nonwoven fabric of the present invention can be used for various purposes including a sanitary product such as a back sheet of a disposable diaper, a surgical gown, a mask, and the like, which is directly contacted to human skin.

Further, according to the present invention, since the production of the polyethylene long-fiber nonwoven fabric layer and the production of the polypropylene long-fiber nonwoven fabric layer can be performed in one process line, the manufacturing process can be simplified.

1A is a side view of a hybrid nonwoven fabric according to an embodiment of the present invention in which a polypropylene long fiber nonwoven fabric layer is formed on one side of a polypropylene long fiber nonwoven fabric layer.
1B is a side view of a hybrid nonwoven fabric according to an embodiment of the present invention in which a polypropylene nonwoven fabric nonwoven fabric layer is formed on both upper and lower surfaces of a polypropylene nonwoven fabric nonwoven fabric layer.
2 is a side view of one embodiment of a manufacturing apparatus used to produce the hybrid nonwoven fabric of the present invention.
3 is a side view of one aspect of a manufacturing apparatus used to manufacture the hybrid nonwoven fabric of the present invention.

Hereinafter, the present invention will be described in detail. The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

The term 'hybrid nonwoven fabric' as used herein refers to a nonwoven fabric having a polypropylene nonwoven fabric layer and a polyethylene nonwoven fabric layer attached thereto. In this specification, 'nonwoven fabric' is used in the same meaning as 'hybrid nonwoven fabric', unless it is specifically described as a polypropylene nonwoven fabric layer and a polyethylene nonwoven fabric layer.

The hybrid nonwoven fabric of the present invention comprises a polypropylene long fiber nonwoven fabric layer composed of filaments having a diameter of 10 to 30 占 퐉 and having a polyethylene long fiber nonwoven fabric layer composed of filaments of 10 to 30 占 퐉 in diameter adhered on one surface or both surfaces thereof and having an embossing rate of 5 To 30%, and the unit weight is 10 to 200 g / m ² .

The polypropylene filament or polyethylene filament constituting the hybrid nonwoven fabric of the present invention may have a diameter of 10 to 30 탆. When the filament diameter is less than 10 탆, the filament is too thin to exhibit a sufficient breaking strength. When the filament diameter exceeds 30 탆, the filament is too thick and the orientation is not sufficiently achieved. It is difficult to do.

The polypropylene long-fiber nonwoven fabric layer and the polyethylene long-fiber nonwoven fabric layer used in the present invention may each have a unit weight of 5 to 100 g / m ² . When the unit weight is less than 5 g / m ² , the web is not uniform and can not be used as a product. When the unit weight exceeds 100 g / m ² , the nonwoven fabric can not be used for various purposes because the thickness thereof is thick.

The polypropylene long-fiber nonwoven fabric and the polyethylene long-fiber nonwoven fabric to be used in the present invention are not particularly limited in the method of producing them, and examples thereof include a spun bond method, a meltblown method, a needle punching method, a chemical bond method, Bond method, and spun lace method, and may be preferably produced by a spunbond method or a meltblown method. Preferably, the polypropylene long-fiber nonwoven fabric and the polyethylene long-fiber nonwoven fabric can be produced by the same method, and the properties such as strength, elongation, frictional force and air permeability of the present invention are substantially the same as those of the nonwoven fabric constituting each layer of the hybrid non- Because of the characteristics of the polypropylene long-fiber nonwoven fabric and the polyethylene long-fiber nonwoven fabric itself.

In the present invention, the polypropylene resin used for producing the polypropylene long-fiber nonwoven fabric has a melt index of 20 to 40 g / 10 min as measured at a density of 0.920 to 0.960 g / cm ³ and a load of 2.16 kg at 230 캜, The polyethylene resin used for producing the fibrous nonwoven fabric preferably has a density of 0.920 to 0.960 g / cm ³ and a melt index of 10 to 30 g / 10 min as measured at a temperature of 190 캜 and a load of 2.16 kg.

The hybrid nonwoven fabric of the present invention may have a unit weight of 10 to 200 g / m ² . When the unit weight is less than 10 g / m ² , the air permeability is excellent but the strength is too low. When the unit weight is more than 200 g / m ² , the air permeability is low and it is difficult to use the product as a product.

The hybrid nonwoven fabric of the present invention may have an embossing rate of 5 to 30%. When the embossing ratio is less than 5%, the breathability is excellent, but the adhesion between the polypropylene long-fiber non-woven fabric layer and the long polyethylene non-woven fabric layer is deteriorated to separate the layers from each other. When the embossing ratio exceeds 30% The porosity of the product is lowered and the product flexibility and air permeability are lowered.

The hybrid nonwoven fabric of the present invention comprises: (S1) forming a polypropylene long fiber nonwoven fabric layer; (S2) forming a polyolefin filament nonwoven fabric layer on one side or both sides of the polypropylene nonwoven fabric nonwoven fabric layer; And (S3) bonding the polypropylene long fiber nonwoven layer and the polyethylene long fiber nonwoven layer to each other.

Between the steps (S1) and (S2), a step of preheating the polypropylene long fiber nonwoven fabric layer so as to improve the bonding strength between the polypropylene long fiber nonwoven fabric layer and the polyethylene long fiber nonwoven fabric layer may be further included. This preheating can solve the problem that the polypropylene long fiber nonwoven fabric produced in step (S1) is exposed to the outside, cooling is caused by the outside air, and thus the bonding strength with the polyethylene long fiber nonwoven fabric layer in the subsequent step is lowered . When the polypropylene long fiber nonwoven fabric produced in the step (S1) is preheated and the temperature of the polypropylene long fiber nonwoven fabric is kept constant, the bonding strength with the polyethylene long fiber nonwoven fabric layer can be improved.

Further, between steps (S2) and (S3), a step of preheating the polypropylene long-fiber non-woven fabric layer and the polyethylene long-fiber non-woven fabric layer so as to improve the bonding force between the polypropylene long- .

The preheating may be performed at a temperature of about 80 to 120 DEG C, and may be performed using a preheating apparatus that is conventional in the art. When the preheating temperature is lower than 80 ° C, the polypropylene long-fiber nonwoven fabric layer is not sufficiently bonded to the polypropylene long-fiber nonwoven fabric layer to be separated from each other. When the temperature exceeds 120 ° C, A problem may arise in which the long fiber nonwoven fabric layer is bonded to a device such as a forging belt and is not separated.

In step (S3), heat, an adhesive (binder), or both may be used together with the pressing roller. In the case of using heat, a heat of a temperature range of 80 to 120 DEG C may be used in order to maintain soft touch while appropriately suppressing an increase in elongation. When an adhesive (binder) is used, it is possible to use an adhesive (binder) commonly used in the art such as acrylic, vinyl acrylic, vinyl acetate, ethylene vinyl acetate, styrene-butadiene, polyvinyl chloride, But is not limited thereto.

The coupling in the step (S3) may be 4 to 8 kgf / cm < ² > Under pressure. For the adhesive under pressure 4 kgf / cm ² has a polypropylene long-fiber nonwoven fabric layer and are easily separated polyethylene sheet adhesion of the fibrous nonwoven fabric layers do not yirwojiji properly and cause the rupture strength decreases, the bonding pressure is 8 kgf / cm ² The polyethylene long-fiber non-woven fabric layer may be excessively squeezed to deteriorate the air permeability.

Hereinafter, a hybrid nonwoven fabric having a high strength and a soft feel characteristic according to the present invention and a method of producing the same will be described in detail with reference to the drawings.

FIGS. 1A and 1B are side views showing a nonwoven fabric 100 having a soft touch property according to an embodiment of the present invention. More specifically, FIG. 1A shows a hybrid nonwoven fabric 100 in which a nonwoven fabric layer 102 of polyethylene is formed on the upper surface of a nonwoven fabric layer 101 of polypropylene, and FIG. 1B is a cross- In which a polyethylene long-fiber nonwoven fabric layer 102 is formed on both upper and lower surfaces of a non-woven fabric 200.

Fig. 2 is a side view of an embodiment of a device for producing a hybrid nonwoven fabric in which a polyethylene filament nonwoven fabric is formed on one side of a polypropylene nonwoven fabric nonwoven fabric layer. Fig. 3 is a cross- In an aspect of an embodiment of an apparatus for producing a hybrid nonwoven fabric in which a fibrous nonwoven fabric is formed.

2, the apparatus for producing a hybrid nonwoven fabric comprises extruders 4a and 4b for polypropylene resin and polyethylene resin, metering pumps 6a and 6b, spin packs 7a and 7b, a cooling and stretching device 8a 8b, a forming belt 10, preheating devices 12, 14, a coupling device 17, and a winder 20.

A method of manufacturing the hybrid nonwoven fabric of FIG. 1A using the manufacturing apparatus of FIG. 2 will be described below.

First, a polypropylene long fiber nonwoven fabric layer is formed (step S1). For this purpose, the polypropylene resin (1) in the form of pellets is supplied to an extruder (4a) having a temperature of 160 to 250 DEG C through a hopper (3a) and melted. The molten polypropylene resin is supplied to the spin pack 7a through the metering pump 6a after a certain amount of impurities have been removed through the filter 5a. A polypropylene filament is formed in the spin pack 7a through a spinneret having a diameter of 0.3 to 1.0 mm and a temperature of 180 to 250 占 폚. The formed filaments are stretched by air in the cooling and stretching device 8a, and then formed and transported on the forming belt 10 at the same time. The polypropylene long fiber nonwoven fabric layer formed on the forming belt 10 may be heated to a temperature of 80 to 120 캜 by the heating plate 13 while passing through the preheating device 12. At this time, when the temperature of the heating plate is less than 80 ° C, the polyethylene long fiber nonwoven fabric layer 102 formed on the polypropylene long fiber nonwoven fabric layer 101 is not sufficiently bonded to each other, The polypropylene long fiber nonwoven fabric layer 101 is melted and adhered to the forming belt 10, which may result in failure of separation.

Subsequently, a polyethylene long-fiber nonwoven fabric layer 102 is formed on the transferred polypropylene long-fiber nonwoven fabric layer 101 (step S2). The polyethylene resin 2 in the form of pellets is supplied to an extruder 4b having a temperature of 160 to 250 DEG C through a hopper 3b to be melted. The molten polyethylene resin is supplied to the spin pack 7b in a constant amount via the metering pump 6b after the impurities are removed through the filter 5b. A polyethylene filament is formed in the spin pack (7b) through a spinneret having a diameter of 0.3 to 1.0 mm and a temperature of 180 to 250 占 폚. The filament thus formed is stretched by the air supplied from the stretching device 9b via the cooling device 8b, and is then conveyed while forming a web on the polypropylene nonwoven fabric layer 101 formed on the forming belt 10. The polypropylene long-fiber nonwoven fabric layer 101 and the polyethylene long-fiber nonwoven fabric layer 102 formed on the forming belt 10 are joined together by a joining device 17 to a heating plate 15 The preheating device 14 may be preheated. At this time, when the temperature of the heating plate is less than 80 ° C, the polyethylene long fiber nonwoven fabric layer 102 formed on the polypropylene long fiber nonwoven fabric layer 101 is not sufficiently bonded to each other, The polyethylene long fiber nonwoven fabric layer 102 is melted and adhered to the spin belt and is not separated.

Then, the preheated polypropylene long-fiber nonwoven fabric layer 101 and the polyethylene long-fiber nonwoven fabric layer 102 are joined by the pressing rollers 18 and 19 of the engaging device 17 (step S3). A pressure of 4 to 8 kgf / cm < ² > is maintained between the pressing rollers. The pressing roller 18 may be embossed in a rhombic shape or a pattern such as a circular or elliptical shape to form an embossing on the finally produced nonwoven fabric, which is carved so as to occupy 5 to 30% of the total area of the product. If the area of the pattern is less than 5%, the adhesive strength between the polypropylene long-fiber non-woven fabric layer 101 and the long-polyethylene non-woven fabric layer 102 is weak and can be easily separated from each other. It is disadvantageous in that sweat is easily produced when using mask or disposable surgical gown.

2, the hybrid nonwoven fabric 100 having a soft touch property is formed on one surface of a polypropylene long-fiber nonwoven fabric layer 101 composed of filaments having a diameter of 10 to 30 占 퐉 and having a diameter of 10 Filament < / RTI > nonwoven fabric layer 102 made up of filaments of 30 to 30 microns (Fig. 1A).

Further, the manufacturing apparatus of FIG. 3 described above may further include additional preheating devices 22 and 24, and a plurality of preheating devices 22 and 24 during the steps (S1) to (S3) to further form a polyolefin filament nonwoven fabric layer on the other side of the polypropylene long- The hybrid nonwoven fabric 100 manufactured by the manufacturing apparatus of FIG. 3 may further include heating plates 25 and 26 and an unwinder 23. The hybrid nonwoven fabric 100 may include polyethylene And a long fibrous nonwoven fabric layer 102 is laminated thereon, thereby producing a hybrid nonwoven fabric 200 having soft touch properties (Fig. 1B).

According to the present invention, as shown in FIGS. 2 and 3, since the production of each of the polyethylene long-fiber nonwoven fabric layer and the polypropylene long-fiber nonwoven fabric layer can be performed in one process line, the manufacturing process can be advantageously simplified have.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to examples.

≪ Example 1: Production of nonwoven fabric >

The polypropylene pellets having a melt index of 30 g / 10 min were put into an extruder having a temperature of 230 캜 to be melted and then spun through a spinneret having a temperature of 230 캜 using a metering pump. The spun fibers were cooled and stretched Stretched and cooled to form a polypropylene filament layer on the Forming Belt. The polypropylene long fiber layer was preheated through a preheating device heated to a temperature of 120 占 폚. Further, the polyethylene pellets having a melt index of 17 g / 10 min were put into an extruder having a temperature of 230 ° C to be melted and then spun through a spinneret at a temperature of 230 ° C using a metering pump. The spun fibers were cooled and stretched And cooled to form a web on the polypropylene long fiber nonwoven fabric layer formed on the forming belt. Chapter polypropylene long-fiber layer and the polyethylene formed on Forming Belt fiber layer is the temperature after passing through the pre-heating device and heated to 100 ℃ embossing rate of Polypropylene Sheet to pressure 6 kgf / cm ² by a pressure roller 24 percent fiber non-woven fabric Layer and a polyethylene long fiber nonwoven fabric layer were bonded to each other to prepare a hybrid nonwoven fabric. The prepared hybrid nonwoven fabric was wound into a winder with a predetermined length.

≪ Examples 2 to 3: Preparation of nonwoven fabric >

A nonwoven fabric was produced in the same manner as in Example 1, except that the embossing rate embossed on the pressing roller of the coupling device was changed to the value shown in Table 1. [

≪ Examples 4 to 5: Production of nonwoven fabric >

A nonwoven fabric was produced in the same manner as in Example 1, except that the pressure of the pressing roller of the coupling device was changed to the bonding pressure shown in Table 1.

≪ Examples 6 to 7: Preparation of nonwoven fabric >

A nonwoven fabric was produced in the same manner as in Example 1, except that the temperature of the heating plate of the preheating apparatus was changed to the temperature shown in Table 1.

≪ Examples 8 to 10: Production of nonwoven fabric >

A nonwoven fabric was prepared in the same manner as in Example 1, except that the fiber diameters of the polypropylene long-fiber non-woven fabric layer and the polyethylene long-fiber non-woven fabric layer were changed to the fiber diameters shown in Table 1.

≪ Examples 11 to 13: Production of nonwoven fabric >

A nonwoven fabric was prepared in the same manner as in Example 1, except that the unit weight of the hybrid nonwoven fabric was changed to the unit weight shown in Table 1.

≪ Comparative Examples 1 to 2: Production of nonwoven fabric >

A nonwoven fabric was produced in the same manner as in Example 1 except that the embossing rate embossed on the pressing roller of the engaging device was changed to the value shown in Table 2. [

≪ Comparative Examples 3 to 4: Production of nonwoven fabric >

A nonwoven fabric was produced in the same manner as in Example 1, except that the pressure of the pressing roller of the coupling device was changed to the pressure shown in Table 2.

≪ Comparative Examples 5 and 6: Preparation of nonwoven fabric >

A nonwoven fabric was produced in the same manner as in Example 1, except that the temperature of the heating plate of the preheating device was changed to the temperature shown in Table 2.

≪ Comparative Examples 7 and 8: Preparation of nonwoven fabric >

A nonwoven fabric was prepared in the same manner as in Example 1, except that the fiber diameters of the polypropylene nonwoven fabric layer and the nonwoven fabric layer were changed to those shown in Table 2.

≪ Comparative Examples 9 and 10: Production of nonwoven fabric >

The procedure of Example 1 was repeated except that the unit weight of the hybrid nonwoven fabric was changed to the unit weight shown in Table 2.

≪ Comparative Example 11: Production of nonwoven fabric >

The procedure of Example 1 was repeated except that the polypropylene pellets were changed to polyethylene pellets.

≪ Comparative Example 12: Production of nonwoven fabric >

The procedure of Example 1 was repeated except that the polyethylene pellets were changed to polyethylene pellets instead of polypropylene pellets.

≪ Comparative Example 13: Production of nonwoven fabric >

A nonwoven fabric was prepared in the same manner as in Example 1, except that the polypropylene fibers and the polyethylene fibers were made into one spinneret and the cross-section of the fibers had a sheath / core shape as shown in Table 2. [ At this time, the core portion had a polypropylene resin content of 50% and the sheath portion had a polyethylene resin content of 50%.

Melt Index ASTM  Measurement of D 1238

The melt index of the polyethylene resin and the polypropylene resin were measured using a melt indexer at 190 ° C / 2.16 kg and 230 ° C / 2.16 kg, respectively.

Evaluation example  1: coefficient of friction KS  M ISO  Measurement of 15359

This test measures the force (static frictional force) required to start the slip and the force (dynamic frictional force) required to slide the surface contacted after the surface to be tested is placed so that the two surfaces are in contact with each other under a uniform contact pressure. At a rate of 20 ± 2 mm / min.

Evaluation example  2: Strength and elongation KS  K ISO  Measurement of 9073-3

For this evaluation, cut strength and elongation values were measured from the recorded load-elongation curves after constant-speed stretching the test specimens of prescribed length and width so that a force was applied in the longitudinal direction. That is, the nonwoven fabric cut to a width of 50 mm was gripped by a force gauge measuring device at a length of 75 mm and then measured at a speed of 300 mm / min.

Evaluation example  3: Air permeability (air permeability) KS  K ISO9073 -3 measurement

The evaluation was conducted by measuring the amount of air flowing vertically through a nonwoven fabric having a constant area and measuring a given pressure difference ( ²⁰⁰ Pa) against a test area (20 cm ² ) of the nonwoven fabric for a certain period of time.

Long-fiber nonwoven fabric layer Coupling condition Hybrid nonwoven fabric ingredient fiber
Section shape Fiber diameter Preheat temperature Coupling pressure Emboss rate Unit weight strong
(MD) Shindo
(MD) Frictional force Breathability - - ㎛ ° C kgf / cm ² % g / m ² kg / 5 cm % / 5cm kg / m ² cfm Example 1 PP, PE Mono 20 100 6 24 90 22.0 32.7 153.4 312 Example 2 PP, PE Mono 20 100 6 14 90 20.5 33.0 142.1 311 Example 3 PP, PE Mono 20 100 6 28 90 22.1 35.3 146.7 313 Example 4 PP, PE Mono 20 100 8 24 90 23.0 36.7 152.8 308 Example 5 PP, PE Mono 20 100 4 24 90 20.7 34.7 148.5 323 Example 6 PP, PE Mono 20 85 6 24 90 22.2 32.3 150.8 326 Example 7 PP, PE Mono 20 115 6 24 90 22.0 32.7 144.1 312 Example 8 PP, PE Mono 12 100 6 24 90 21.4 31.5 142.5 313 Example 9 PP, PE Mono 16 100 6 24 90 22.2 32.2 150.7 321 Example 10 PP, PE Mono 27 100 6 24 90 21.3 33.8 149.8 311 Example 11 PP, PE Mono 20 100 6 24 12 10.8 15.2 139.7 1104 Example 12 PP, PE Mono 20 100 6 24 50 17.7 27.4 146.4 678 Example 13 PP, PE Mono 20 100 6 24 150 23.9 37.4 151.2 123

Long-fiber nonwoven fabric layer Coupling condition Hybrid nonwoven fabric ingredient fiber
Section shape Fiber diameter Preheat temperature Coupling pressure Emboss rate Unit weight strong
(MD) Shindo
(MD) Frictional force Breathability - - ㎛ ° C kgf / cm ² % g / m ² kg / 5 cm % / 5cm kg / m ² cfm Comparative Example 1 PP, PE Mono 20 100 6 3 90 15.0 23.4 148.5 445 Comparative Example 2 PP, PE Mono 20 100 6 35 90 26.9 40.3 138.6 172 Comparative Example 3 PP, PE Mono 20 100 2 24 90 12.3 17.3 158.1 354 Comparative Example 4 PP, PE Mono 20 100 10 24 90 18.3 28.3 145.7 255 Comparative Example 5 PP, PE Mono 20 70 6 24 90 17.2 23.4 151.6 445 Comparative Example 6 PP, PE Mono 20 130 6 24 90 20.5 28.5 150.5 217 Comparative Example 7 PP, PE Mono 7 100 6 24 90 17.4 22.7 169.8 328 Comparative Example 8 PP, PE Mono 33 100 6 24 90 16.0 23.3 135.8 315 Comparative Example 9 PP, PE Mono 20 100 6 24 8 5.2 6.8 137.8 1214 Comparative Example 10 PP, PE Mono 20 100 6 24 210 26.7 39.5 154.3 32 Comparative Example 11 PP Mono 20 100 6 24 90 28.7 36.3 61.5 315 Comparative Example 12 PE Mono 20 100 6 24 90 8.0 60.7 152.3 313 Comparative Example 13 PP, PE sheath / core 20 100 6 24 90 16.2 26.2 154.9 310

Referring to Tables 1 and 2, in Examples 1 to 3 and Comparative Examples 1 and 2 according to embossing ratios of the hybrid nonwoven fabric, the air permeability was excellent in Comparative Example 1 in which the embossing ratio was 3% Since the bonding strength between the nonwoven fabric layer and the polyethylene long-fiber nonwoven fabric layer is low, the strength of breakage of the product is lowered and it can not be used as a product. In the case of Comparative Example 2 in which the embossing ratio is 35%, the flexibility of the product is low and the breathability is low. Can not use it.

In Examples 1 and 4 to 5 and Comparative Examples 3 to 4 according to the bonding pressure, in Comparative Example 3 in which the bonding pressure was 2 kgf / cm ² , the two layers were not properly adhered to each other, In the case of Comparative Example 4 in which the bonding pressure is 10 kgf / cm ² , there is a problem that the polyethylene filament and the polypropylene filament are pressed against each other due to high pressure, and the breathability is lowered.

In Examples 1 and 6 to 7 and Comparative Examples 5 and 6 for examining the adhesion between the polypropylene long fiber nonwoven fabric layer and the polypropylene long fiber nonwoven fabric layer according to the preheating temperature of the preheating device, In the case of Comparative Example 6 in which the temperature was too low because the temperature was too low to cause adhesion between the two layers and the breaking strength was low and the preheating temperature was 130 DEG C, the temperature was too high, so that the polyethylene long fiber layers melted each other, There is a problem that the propylene long-fiber nonwoven fabric layer is bonded to the forming belt and is not easily separated.

In Examples 8 to 10 and Comparative Examples 7 to 8 according to the fiber diameters, in Comparative Example 7 having a fiber diameter of 7 탆, sufficient breaking strength was not exhibited because the fibers were too thin, and when the fiber diameter was 33 탆 In the case of Comparative Example 8, since the fiber is too thick, the orientation is not sufficiently achieved, and therefore, the breaking strength is reduced and it is not flexible and therefore, it is difficult to use as a product.

In Examples 1 and 11 to 13 and Comparative Examples 9 to 10 according to the unit weight, in the case of Comparative Example 9 having a unit weight of 8 g / m ² , the unit weight was low and the breathability was excellent but the strength was too low. in the case of a weight of 210 g / m ² in Comparative example 10, the ventilation can not be used to lower the product because the fibers are more lamination.

In Example 1 and Comparative Examples 11 and 12 according to the material of the nonwoven fabric, Comparative Example 11 composed of polypropylene long fibers exhibited excellent strength but had a low frictional force, In the case of Example 12, tactile feeling is difficult to form a soft fiber and has low breaking strength, making it difficult to use as a product.

On the other hand, in Example 1 and Comparative Example 13 according to the shape of the fiber cross-section, in the case of Comparative Example 13 having a sheath / core structure composed of a polypropylene core portion and a polyethylene sheath portion, frictional force and breathability , But since the polypropylene constitutes 50% of the cross section of the fiber, the breaking strength was lower than that of the case where the polypropylene was composed of a single component.

1: Polypropylene resin
2: Polyethylene resin
3a and 3b: hopper
4a and 4b: extruder
5a and 5b: filter
6a and 6b: metering pump
7a and 7b: spin pack
8a and 8b: cooling and drawing device
10: Forming Belt
12, 14, 22 and 24: a preheating device
13, 15, 16, 25 and 26: Heating plate
17: Coupling device
18 and 19: Compression roller
20: Winder
21, 23: unwinders

Claims (9)

A polyethylene long-fiber nonwoven fabric layer composed of filaments having a diameter of 10 to 30 占 퐉 is attached to one side or both sides of a polypropylene long-fiber nonwoven fabric layer composed of filaments having a diameter of 10 to 30 占 퐉,
The embossing ratio is 5 to 30%
And a unit weight of 10 to 200 g / m ² .
The method according to claim 1,
Wherein the polypropylene long-fiber nonwoven fabric and the polyethylene long-fiber nonwoven fabric both are spun-bonded nonwoven fabrics.
The method according to claim 1,
The polypropylene filament nonwoven fabric is obtained from a polypropylene resin having a density of 0.920 to 0.960 g / cm ³ and a melt index of 20 to 40 g / 10 min, and has a density of 0.920 to 0.960 g / cm ³ and a melt index of 10 to 30 g / 10 min. < / RTI > wherein said polyethylene filament nonwoven fabric is obtained.
(S1) forming a polypropylene long fiber nonwoven fabric layer;
(S2) forming a polyolefin filament nonwoven fabric layer on one side or both sides of the polypropylene nonwoven fabric nonwoven fabric layer; And
(S3) bonding the polypropylene long-fiber nonwoven fabric layer and the polyethylene long-fiber nonwoven fabric layer to each other,
Further comprising the step of preheating the polypropylene nonwoven fabric nonwoven fabric layer between the step (S1) and the step (S2) so as to improve the bonding between the polypropylene long-fiber nonwoven fabric layer and the polyethylene long- Way.
5. The method of claim 4,
Method of manufacturing a non-woven fabric characterized in that for coupling to the pressure at the (S3) step, with 4 to 8 kgf / cm ² pressure.
delete 5. The method of claim 4,
Further comprising the step of preheating the polypropylene nonwoven fabric layer and the polyethylene filament nonwoven fabric layer between the step (S2) and the step (S3) so as to improve the bonding between the polypropylene long-fiber nonwoven fabric layer and the polyethylene long- ≪ / RTI >
8. The method of claim 7,
Wherein the preheating is performed at a temperature of 80 to 120 ° C.
5. The method of claim 4,
Wherein the steps (S1) to (S3) are performed in one process line.

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