KR101319183B1 - Spunbond nonwoven fabric having an improved property and preparing method thereof - Google Patents

Abstract

The present invention relates to a composite spun long fiber spunbond nonwoven fabric having improved properties, and a method of manufacturing the same. The method of manufacturing a composite spun long fiber spunbond multilayer nonwoven fabric having improved properties as described above can provide a spunbond nonwoven fabric. Spunbond as outer layer and inner layer has one layer of meltblown nonwoven fabric and at least one spunbond nonwoven layer and meltblown nonwoven layer may be additionally laminated or meltblown layer may not be laminated as necessary In the method for producing a multi-layer nonwoven fabric, the manufacturing method includes a high melting point polymer or a propylene polymer in the core portion by placing a distribution plate between the spin beam and the spinning nozzle so as to surround the sheath portion in the longitudinal direction. Deep-melting composites by inducing and radiating low melting point polymers or ethylene-based polymers toward each nozzle hole A long fiber is prepared and the spun composite long fiber is laminated on a porous continuous belt that is easy to separate the fiber web and the belt to form a web of the composite long fiber to facilitate separation of the fiber web and the belt. It is characterized in that it comprises a step of manufacturing the air blowing device and the composite sheet of the fibrous web by heat treatment winding with a suction drum in the form of a sheet, which is partially heat-pressed and fixed by an embossed bond.
The composite spun long fiber spunbond multilayer nonwoven fabric of the present invention configured as described above and the manufacturing method thereof facilitate the separation of the web without the composite multilayer nonwoven laminate being stuck on the belt, and in particular, as the web weight is lowered or the flexibility is increased. The present invention provides a flexible composite spunbond long fiber multilayer nonwoven fabric having good web uniformity, excellent flexibility, breathability, and water resistance, and excellent adhesive strength between layers.

Description

Spunbond nonwoven fabric having an improved property and preparing method

The present invention relates to a composite spun long fiber spunbond nonwoven fabric having improved properties, and to a method of manufacturing the same, more specifically, to a spunbond nonwoven fabric as an outermost layer and an inner layer having a meltblown nonwoven layer of at least one, A spunbond nonwoven fabric in which at least one spunbond nonwoven fabric layer and a meltblown nonwoven fabric layer may be additionally laminated or a meltblown layer may not be laminated. The spunbond nonwoven fabric forming the outermost layer of the nonwoven fabric may be a low melting polymer. The present invention relates to a composite spun long fiber spunbond multilayer nonwoven fabric comprising a high melting point polymer composed of a long sheath fiber that surrounds the fiber in the longitudinal direction and preventing soft shrinkage and deterioration of adhesive strength, and having soft touch and excellent flexibility. .

In general, the spunbond long fiber nonwoven fabric refers to a nonwoven fabric made by spinning a chemical fiber, and is a kind of nonwoven fabric which is formed by blowing a fiber from a nozzle onto a traveling conveyor to form a long layer of fiber on the conveyor. It is efficient and economically advantageous. The meltblown nonwoven fabric refers to a nonwoven fabric manufactured by a meltblown process. Since the web used herein is a superfine fiber, it has excellent softness and warmth, and has a high filtration performance. But the strength of the web is very weak. The raw materials most commonly used in the spunbond and meltblown nonwoven fabric manufacturing processes, which are the production methods of such nonwoven fabrics, are generally polyolefin resins and polyamide resins such as polyethylene, polypropylene and polyethylene terephthalate. These resins are melt- The web is formed into a fibrous material, and a nonwoven fabric is produced by a heat bonding method.

By the way, the spunbonded nonwoven fabric made of the conventionally known polypropylene long fiber as described above has a drawback that it is not flexible and does not have an excellent touch. Therefore, as a method to compensate for the above disadvantages, there is a method of forming a web by air spraying or carding polypropylene short fiber and bonding it with a heated roller, or a short fiber nonwoven fabric through an air-through method. There is a problem in performance and strength, and it is not preferable because there is a decrease in productivity and physical properties due to slimming of the sanitary material. In addition, the spunbond nonwoven fabric made of polyethylene filament has a relatively soft and good feel, but is difficult to be applied to hygiene materials such as diapers or sanitary napkins or industrial because of difficulty in spinning, low strength and high elongation.

Accordingly, in order to solve the above problems, Korean Patent Laid-Open Publication No. 2001-0012474 uses a spunbond nonwoven fabric of propylene and ethylene composite fibers as a spunbond nonwoven fabric, and a specific polyolefin elastomer as a meltblown nonwoven fabric. Flexible nonwoven laminate having a spunbond nonwoven layer and a meltblown nonwoven layer made of a polyolefin composition of a propylene-based polymer, having good uniformity, excellent flexibility, breathability and water resistance, and excellent adhesive strength between the layers. A nonwoven fabric laminate is disclosed, and Korean Laid-Open Patent Publication No. 2001-0034314 discloses a polyethylene-based resin (A) having a high melting point of 120 to 135 ° C. and a low melting point of 90 to 125 ° C. at least 5 ° C. lower than the high melting point. And a high melting point resin (B) having a melting point of 10 ° C. or more higher than that of the polyethylene resin (A), and a polyethylene resin (A) A composite fiber, preferably a core, in which the weight component ratio (A / B) of the point resin (B) is 50/50 to 10/90, and the polyethylene-based resin (A) continuously forms at least a part of the fiber surface in the longitudinal direction. The present invention discloses a composite fiber nonwoven fabric obtained by using a seed-type or side-by-side composite fiber, and Korean Patent Laid-Open Publication No. 2004-0013756 is a composite long fiber nonwoven fabric and a method of manufacturing the same, and soft touch to a spunbond multilayer nonwoven fabric. In the manufacture of the outermost spunbond nonwoven fabric in order to provide excellent flexibility, the melt-blown between the spunbond layer made of long sheath filaments in the longitudinal direction of the polypropylene fiber of the low melting point polymer polypropylene fiber A method of forming a layer and thermocompressing it is disclosed. In addition, the Republic of Korea Patent Publication No. 2011-0021147, the elongation is relatively increased by using polyethylene as a low melting point polymer to add a process for heat treatment by the hot air to the problem with the conventional elongation, by the process width by product width shrinkage Loss and trouble have been solved.

However, in the prior art, such as the Republic of Korea Patent Publication No. 2001-0012474, when the ethylene component content is increased to increase the degree of flexibility, or when the weight of the nonwoven web is low, the nonwoven fabric lamination agent is different on the belt due to the flexible properties of the raw material In the high-speed facilities that produce diapers, sanitary napkins, etc., such as sticking or web separation, problems such as production line upset due to frequent equipment failures are occurring.

Patent Document 1: Republic of Korea Patent Publication No. 2001-0012474 Patent Document 2: Republic of Korea Patent Publication No. 2001-0034314 Patent Document 3: Republic of Korea Patent Publication No. 2004-0013756 Patent Document 4: Republic of Korea Patent Publication No. 2011-0021147

Accordingly, an object of the present invention is to solve the problems of these nonwovens based on the background of the problems of the conventional nonwovens as described above. By sticking or facilitating web separation, web uniformity is good, especially in solving the problem of delamination of multi-layered nonwovens due to low web weight or increased flexibility, and excellent flexibility, breathability and water resistance. It is to provide a flexible composite spunbond long fiber multilayer nonwoven fabric having excellent adhesive strength between the layers.

Another object of the present invention is to provide a manufacturing method that can more easily produce a composite spunbond long fiber multilayer nonwoven fabric having the above excellent characteristics.

The present invention may also be directed to accomplish these and other objects, which can be easily derived by those skilled in the art from the overall description of the present specification, in addition to the above-mentioned and obvious objects.

Method for producing a composite spun long fiber spunbond multilayer nonwoven fabric having an improved characteristic of the present invention for achieving the above object;

The spunbond nonwoven fabric is the outermost layer and the inner layer has one layer of meltblown nonwoven layer, and at least one spunbond nonwoven layer and the meltblown nonwoven layer are additionally laminated or the meltblown layer is not laminated as necessary. In the method of producing a spunbond multilayer nonwoven fabric, which may not be

The manufacturing method includes a high melting point polymer or a propylene polymer in the core part and a low melting point polymer in the core part by placing a distribution plate between the spin beam and the spinning nozzle to surround the sheath part in the longitudinal direction. Or by injecting and spinning ethylene-based polymer toward each nozzle hole to produce a deep sheath type long filament and laminating the spun composite filament on a porous continuous belt that is easy to separate the fibrous web and the belt. Manufactured by air-treating winding with a suction drum to form a web and an air jet device for facilitating separation of the fiber web and the belt, and a sheet form in which the composite long fiber web is partially thermally compressed and fixed by an embossing bond. It is characterized by consisting of steps.

According to another configuration of the present invention, the sheath-core spunbonded filament nonwoven layer melts a polypropylene resin having a melt index (MI) of 30 ° C. to 60 g / 10 min at 230 ° C. as a high melting point polymer of the core. In addition, the low melting point polymer of the initial portion is characterized in that the melting index (MI) at 190 ℃ 25 ~ 35g / 10 minutes and the density is 0.9515 to 0.9565 by melting the high density polyethylene (HDPE) resin.

In the present invention, the propylene homopolymer, the random copolymer, or the block copolymer may be used alone or in combination of two or more as the propylene polymer. In addition, polyethylene, for example, high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE) and the like may be used as the low melting point polymer in the present invention. Polyolefin polymers suitable for the low melting point polymer component may be selected if the selected olefin polymer preferably has a lower melting point than the high melting point component polymer according to the melting temperature difference range, preferably polyethylene, polypropylene or These blend copolymers are mentioned.

According to another configuration of the present invention, the weight ratio of the core portion and the core portion of the sheath (Core) -type spunbond long fiber nonwoven fabric is characterized in that the composite melt spinning to be 50 to 50 to 70 to 30.

According to another embodiment of the present invention, the air jetting rate of the air jet apparatus for facilitating the separation of the laminated fibrous web and the belt is a proper air speed of 15 to 25 m / s.

As described above, the manufacturing method of the present invention is characterized in that the use of an air blowing device to facilitate the separation of the laminated nonwoven fabric and the belt, a rectangle formed with a plurality of holes between the conveyor belt and the calender roll before thermal bonding Shaped air injection device serves to facilitate the separation of the laminated nonwoven fabric and the conveyor belt by injecting a predetermined air pressure from the upper to the lower portion of the belt. The air injection speed of the air injection device needs to be maintained at 5 to 30 m / s, particularly preferably 15 to 25 m / s. If the air jetting speed is less than 5 m / s, separation between the belt and the nonwoven fabric sheet is not smoothly performed. If the air jetting speed is more than 30 m / s, the air pressure is too strong.

According to another configuration of the invention, the heat treatment temperature in the process of heat treatment with the suction drum is characterized in that 80 to 110 ℃. If heat-treated at 80 ℃ or less with a suction drum, there is no thermal setting effect of the meltblown layer and the low-melting polymer of the spunbond nonwoven filament, so that the increase in elongation is suppressed. It is unfavorable because it can damage.

Composite spun long fiber spunbond multi-layer nonwoven fabric having improved characteristics of the present invention for achieving the above another object;

Spunbond nonwoven fabric with spunbond nonwoven fabric as outermost layer and inner layer with at least one meltblown nonwoven fabric layer and additionally laminated at least one spunbond nonwoven fabric layer and meltblown nonwoven fabric layer as necessary To

The spunbond nonwoven layer forming the outermost layer is composed of a pleated long fiber in which a low melting point polymer surrounds a high melting point polymer in the longitudinal direction of the fiber, and a meltblown nonwoven layer between the spunbonded nonwoven layer made of the pleated long fiber. The formed and stacked on a continuous belt, the web is formed and subjected to an air jet device for facilitating separation of the fiber web and the belt, and then heat-compression bonded by a calender roll to form a sheet, followed by heat treatment with a suction drum. It is characterized by being manufactured.

According to another configuration of the present invention, the weight of the nonwoven fabric forming the meltblown nonwoven layer between the spunbond nonwoven fabric layer is 0.5 to 2.0gsm / ㎡. If the weight of the meltblown nonwoven fabric is less than 0.5 g / m 2, the tissue is not dense and the liquid cannot be blocked. If it exceeds 2.0 g / m 2, the tissue becomes dense and effective in blocking the penetration of the synthetic resin. It is not desirable to cause problems.

According to another configuration of the present invention, the composite spunbond long fiber multilayer nonwoven fabric having the improved properties according to the present invention is a disposable diaper, a side gather, a back sheet and a hydrophilic top sheet for a sanitary napkin. It is used for the same purpose as (top sheet).

The composite spun long fiber spunbond multilayer nonwoven fabric of the present invention configured as described above and the manufacturing method thereof facilitate the separation of the web without the composite multilayer nonwoven laminate being stuck on the belt, and in particular, as the web weight is lowered or the flexibility is increased. The present invention provides a flexible composite spunbond long fiber multilayer nonwoven fabric having good web uniformity, excellent flexibility, breathability, and water resistance, and excellent adhesive strength between layers. Therefore, the nonwoven fabric of the present invention configured as described above can be used not only in various applications in which nonwoven fabrics are conventionally used, but also in particular, disposable diapers, sanitary napkins, side gathers, back sheets, top sheets with hydrophilic processing, and the like. It is applicable to the use of.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic illustration of a bimodal system capable of forming a spunbonded nonwoven fabric according to the present invention,
2 is a schematic view of an air jet device used in accordance with the present invention to facilitate separation of the laminated nonwoven fabric and the belt.

As used herein, the term "nonwoven or nonwoven" refers to a web of fibers or filaments that are formed by means other than knitting or weaving and that contain a bond between some or all of the fibers or filaments, and such bonds include, for example, For example, by thermal, adhesive or mechanical means such as entanglement. Conventional nonwovens are formed by spunbond, meltblown, carding, wetlaying and airlaying processes.

As used herein, the term "spunbond" is typically formed into strands quenched and stretched by high velocity air by melt extrusion of a polymer extrudate and collected on a forming surface, often in patterned applications of heat and pressure. By filament bonded by means a nonwoven or nonwoven fabric of the filament.

The two component polymers of the present invention are roughly classified into high melting point polymers and low melting point polymers, and high melting point polymers have a melting point of 5 ° C. or higher, preferably 10 ° C. or higher than other component polymers of long fibers. In the present invention, a high melting point polymer is used as the polypropylene resin because it is flexible and has excellent strength. This resin is a polymer containing 90 mol% or more, preferably 95 mol% or more of structural units derived from propylene.

As used herein, the terms “composite” and “multicomponent” are used interchangeably and each fiber resulting in two or more separate sections occupied by separate polymer components along the entire length of the fiber or filament. Or fibers or filaments formed by combining multiple extrudates with filaments. The cross sections of the fibers can take many different arrangements such as side-by-side, pie, sheath-core, eccentric sheath core and islands-in-the-sea. Of particular interest to the present invention is a sheath-core arrangement.

As described above, the method for producing the composite spunbond long fiber multilayer nonwoven fabric having the improved properties of the present invention is soft and liquid barrier property by combining the flexible property of polyethylene long fiber with the low elongation and high strength property of polypropylene long fiber. In order to provide a composite spunbond long fiber multilayered nonwoven fabric having excellent mechanical properties which solves the conventional problems, the spunbonded nonwoven layer is laminated on a continuously driven conveyor belt and at least one layer on the spunbonded nonwoven layer. The meltblown nonwoven layer is additionally laminated and then the spunbond nonwoven layer is laminated again. In particular, the spunbond long fiber multilayer nonwoven of the present invention is not limited to the construction of a particular layer, for example a single layer (meltblown layer M, or spunbond layer S), a composite of two layers (SS or SM) Or a composite layer of three or more layers (SMS, SMMS, SSMMS, SSMMSS web). In addition, each single layer can vary greatly in weight (gsm).

According to a preferred embodiment of the present invention, the polymer for producing the long-fiber spunbond nonwoven fabric includes polyolefins, polyesters, polyamides, copolymers thereof (olefins, esters, amides or other monomers) and blends thereof. Selected thermoplastic or spinnable polymers.

[Manufacturing method]

Next, a process line for producing a composite spunbond long fiber multilayer nonwoven fabric will be described with reference to the drawings. 1 is a schematic illustration of a bicomponent spinning system that can be used in accordance with the present invention to form a spunbond nonwoven.

As shown in FIG. 1, an exemplary manufacturing process of a nonwoven web according to the present invention first prepares a long fiber spunbond nonwoven by melting the bicomponent polymer. The two-component polymer is prepared by kneading the melted polymer in individual extruders 1 and 2, respectively. The polymer core component is fed from the first hopper (1-1) to the extruder and optionally the polymer core component is fed from the second hopper (HOPPER) 2-1 to the extruder. The molten constituent polymer is transferred from the individual extruders 1 and 2 via respective polymer conduits to the spin beam 3. The form of the spinneret for spinning the bicomponent filaments is known to those skilled in the art and therefore is not described in detail in the present invention. The process line (A) is then solidified by cooling air which is injected through the honeycomb cooling chamber 5 in which the filaments radiated adjacent to the curtain of filaments extending from the spinneret 4 are also solidified. Thereafter, the web is formed on the porous special conveyor belt 9, which is stretched by the pressure of the air blowing from the upper part and the air sucked from the lower part of the conveyor belt, and is separated to a certain weight.

Meltblown nonwoven fabric manufacturing method is a known method commonly used in the art to which the present invention belongs, both sides of the detention when melting and spinning into a plurality of orifices of polypropylene resin having a melt index (MI) of 800 to 1300g / 10 minutes Blown with a strong frenzy in microfiber. In this case, in order not to drop the adhesive strength of the spunbond layer and the meltblown layer, the weight of the meltblown nonwoven fabric is preferably 0.3 to 2 gsm / m 2, and more preferably 0.5 to 1.5 gsm / m 2. If the weight of melt blown nonwoven fabric is less than 0.3gsm / ㎡, the tissue is not dense and the liquid cannot be blocked.If it exceeds 2gsm / ㎡, the tissue becomes dense and effective in blocking the penetration of synthetic resin, but it does not show soft touch. Let's do it.

In the present invention, the denier of the composite spunbond long fiber nonwoven fabric is 5.0 d or less, preferably 3.0 d or less, and more preferably 2.0 d or less. This is because non-woven fabrics can have the flexibility of such fine islands. In addition, the fibers constituting the meltblown nonwoven fabric have a thickness of 1 to 5 탆. The reason is that when the thickness becomes thick, there is a disadvantage of deterioration in strength and touch.

FIG. 2 is a schematic of an air jet device (10 parts of FIG. 1) used in accordance with the present invention to facilitate separation of the laminated nonwoven fabric and the belt, as shown in FIG. A rectangular air blowing device (B-3) having several holes between 1 and the calender roll injects a certain air pressure from the upper side to the upper side of the belt so that the laminated nonwoven fabric B-2 and the conveyor belt B- Remove 1). The air injection speed of the air injector needs to be maintained at 5 to 30 m / s. If the air blowing speed is less than 5m / s, the separation of the belt and the nonwoven sheet phase is not made smoothly, if the air injection speed exceeds 30m / s, the air pressure is too strong so that the sheet is released is undesirable.

The basic multilayered nonwoven fabric has a spunbond nonwoven layer laminated on a continuously driven conveyor belt, a meltblown nonwoven layer stacked on the spunbond nonwoven layer, and finally a spunbond nonwoven layer laminated.

The laminated nonwovens are then thermally bonded to impart mechanical properties and morphological stability. In other words, heat and pressure are applied through the thermal calender rolls to make them thermally adhered and sheeted. At this time, the configuration of the calender roll does not limit the adhesion area, but one side is usually composed of an emboss roll 11 having an adhesion area of 10 kPa to 20%, and one side is composed of a roll 12 having a smooth surface. When the temperature of the roll is above a certain level, the sheet is thermally fused to the heating roll to prevent the production of the sheet, and when the temperature is too low, the physical properties of the sheet are deteriorated. Therefore, the thermal temperature of the calender roll is preferably 120 ° C to 160 ° C, more preferably 130 ° C to 150 ° C.

The thermally bonded nonwoven sheet is subjected to a heat treatment using a hot air suction drum method. The thermally set low melt polymer, which forms the meltblown layer dispersed in the spunbond layer and the sheath type of the spunbond nonwoven filament, is thermally set. It is possible to obtain a composite spunbond long fiber multilayer nonwoven fabric having excellent mechanical properties while maintaining a soft touch, which is inherent to the low melting point polymer. The temperature of the hot air at this time is preferably 70 ° C to 120 ° C, more preferably 80 ° C to 110 ° C. At 80 ° C. or lower, there is no thermal setting effect of the meltblown layer and the low-melting polymer of the spunbonded nonwoven filament, so that the increase in elongation is suppressed, and at 110 ° C. or higher, the soft touch can be impaired, which is not preferable.

Hereinafter, although an Example and a comparative example demonstrate this invention more concretely, it is a matter of course that the scope of the present invention is not limited to these Examples.

The measurement and evaluation of various characteristic values for the spunbond long fiber nonwoven fabric produced according to each of the following Examples and Comparative Examples were measured and evaluated as follows, and the results are shown in Table 1 below.

(1) Tensile elongation: Tensile speed is 500 m / min with the specimen size 5cm (width) x 20cm (length) by EDANA 20.2-89 method using Instron's tensile elongation measuring equipment. It measured on condition of.

(2) Water pressure: The hydrostatic head was measured on the nonwoven fabric by the DIN53,886 method using the FX-3000 tester.

(3) Rolling degree: The rolling degree was measured by WSP90.5 Nonwovens bending length method using a BENDING LENGTH measuring instrument.

Example 1

Using a bicomponent system facility, the extruder condition is 150 mm around the outer wall, L / D 30, and the nozzle condition is 0.6 mm, L / D 4, 5000 holes per unit meter. The conveyor belt used was Suprastat 4000 by COFPA with air permeability units 8910 m 3 / m 2 / Hr (100 Pa) to facilitate separation of the fiber sheet and the belt.

The high melting point polymer melts a polypropylene resin having a melt index (MI) of about 45 g / 10 minutes at 230 ° C., and the low melting point polymer has a high melting point (MI) of about 30 g / 10 minutes and a density of 0.9515 to 0.9565 at 190 ° C. Epoxy composite melt spinning is carried out using polyethylene (HDPE), and the outermost layer is made of a spunbond nonwoven fabric having a superpart of high density polyethylene (HDPE) and a core part of a polypropylene resin with a weight ratio of 50/50. The air release rate of a rectangular air jetting device used for sheet separation after laminating onto a conveyor belt with a spunbond / meltblown / meltblown / spunbond layer with a weight of tumbled nonwoven fabric of 0.8 g / m 2 It was maintained at about 20 m / s. After the thermocompression bonding with a calender roll, a nonwoven fabric having a weight of 15 g / m 2 was obtained by heat treatment at a temperature of 100 ° C. using a 60% hot air suction drum.

Example 2

Compared with Example 1, the raw material / deep material ratio was 30/70, except that a nonwoven fabric was produced in the same manner as in Example 1.

Example 3

Compared with Example 1, only the weight of the meltblown nonwoven fabric was 1.5 g / m 2, and the nonwoven fabric having a total weight of 15 g / m 2 was prepared in the same manner as in Example 1.

Example 4

Compared with Example 1, only the weight of the meltblown nonwoven fabric was set to 1.5 g / m 2, and the nonwoven fabric having a total weight of 12 g / m 2 was prepared in the same manner as in Example 1.

Comparative Example 1

Compared with Example 1, only the weight of the meltblown nonwoven fabric was 0.0 g / m 2, and the nonwoven fabric having a total weight of 15 g / m 2 was prepared in the same manner as in Example 1.

Comparative Example 2

Compared with Example 1, only the weight of the meltblown nonwoven fabric was 3.5 g / m 2, and the nonwoven fabric having a total weight of 15 g / m 2 was prepared in the same manner as in Example 1.

Comparative Example 3

Only the air discharge rate of the air injector for separating the sheet was set to maintain less than 5m / s, except for producing a nonwoven fabric in the same manner as in Example 4.

Comparative Example 4

The heat treatment was not performed by a hot air suction drum method, and a nonwoven fabric was produced in the same manner as in Example 1.

1, 2 --- extruder
3 --- Spin beam
4 --- Spinning nozzle
5 --- Cooling chamber
B-1 --- Conveyor Belt
B-2 --- Laminated Nonwoven
B-3 --- Air Injection Unit

Claims (8)

In the method for producing a spunbond multilayer nonwoven fabric having a spunbond nonwoven fabric as an outermost layer and an inner layer having at least one meltblown nonwoven fabric layer,
The manufacturing method includes a high melting point polymer or a propylene polymer in the core part and a low melting point polymer in the core part by placing a distribution plate between the spin beam and the spinning nozzle to surround the sheath part in the longitudinal direction. Or by injecting and spinning ethylene-based polymer toward each nozzle hole to produce a deep sheath type long filament and laminating the spun composite filament on a porous continuous belt that is easy to separate the fibrous web and the belt. Air-winding device which forms a web to facilitate separation of the fibrous web and the belt, and a sheet form in which the composite long-fiber web is partially heat-pressed and fixed by embossing to be manufactured by heat-treating winding with a suction drum. Consists of steps
The air injector has a rectangular shape in which a plurality of holes are formed, and is positioned between the conveyor belt and the calendar roll before thermal bonding, and injects an air pressure of 5 to 30 m / s upward from the bottom of the conveyor belt. A method of making a composite spunbond long fiber multilayer nonwoven with improved properties, characterized by facilitating separation of the laminated nonwoven fabric and the conveyor belt.
The method of claim 1, wherein the heat treatment temperature in the heat treatment process using the suction drum is 80 to 110 ℃.
delete According to claim 1, wherein the high melting point polymer constituting the outermost spunbond long-fiber nonwoven layer is melted polypropylene resin having a melt index (MI) of 30 to 60g / 10 minutes at 230 ℃ and a low melting point polymer A method for producing a composite spunbond long fiber multilayer nonwoven fabric having improved properties, characterized by using high density polyethylene (HDPE) having a melt index (MI) of 25 to 35 g / 10 min at 190 ° C. and a density of 0.9515 to 0.9565.
According to claim 1, wherein the sheath (Core) -type spunbond long-fiber non-woven layer is a super high density polyethylene (HDPE) and the core is a polypropylene resin, the weight ratio of these core parts and the core parts is 50:50 to 70:30 A method for producing a composite spunbond long fiber multilayer nonwoven fabric having improved properties, characterized in that it comprises a composite filament produced by composite melt spinning.
Composite spunbond long fiber multilayer nonwoven with improved properties, characterized in that it is prepared according to any one of claims 1, 2, 4 and 5.
7. The composite spunbond long fiber multilayer nonwoven of claim 6 wherein the weight of the nonwoven forming the meltblown nonwoven layer between the spunbond nonwoven layers is 0.5 to 2.0 gsm / m2.
Composite spunbond filaments having the improved properties of claim 6 for use in applications such as disposable diapers, side gathers, back sheets, and hydrophilic top sheets. Multilayer nonwoven fabric.

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