JP2013032607A - Conjugate spun filament spun-bonded multi-layered nonwoven fabric having improved characteristics and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conjugate spun-bonded filament multi-layered nonwoven fabric excellent in uniformity, flexibility, air permeability, and water resistance of a web and adhesive strength between layers and method for producing the same.SOLUTION: There is provided a method for producing a spun-bonded multi-layered nonwoven fabric B-2 in which a spun-bonded nonwoven fabric, as an outermost layer, and one melt blown nonwoven fabric layer, as an inner layer, and additional one or more spun-bonded nonwoven fabric layers and melt blown nonwoven fabric layers, as needed, are laminated. The method includes: producing a core-sheath type conjugated filament by interposing a distribution plate between a spin beam and a spinning nozzle and introducing a high melting point polymer or a propylene polymer for a core part and a low melting point polymer or an ethylene-based polymer for a sheath part to respective nozzle hole sides; forming a web by laminating the core-sheath type conjugated filament on a porous continuous belt B-1; subjecting the web to a treatment by an air injector B-3 which allows the web and the belt to be easily separated, and thermally winding the sheet-like material, which is produced by subjecting the web partially to a thermal compression-bonding and fixing it by emboss-bonding, using a suction type drum.

Description

  The present invention relates to a composite spun long fiber spunbond nonwoven fabric having improved properties and a method for producing the same, and more particularly, the spunbond nonwoven fabric is an outermost layer, and the inner layer has a single meltblown nonwoven fabric layer. At least one spunbond nonwoven fabric layer and a meltblown nonwoven fabric layer are additionally laminated, or a spunbond multilayer nonwoven fabric in which a meltblown layer may not be laminated, and constitutes the outermost layer of the nonwoven fabric The spunbond nonwoven fabric is a core-sheath-type long fiber in which the low-melting polymer surrounds the high-melting polymer in the longitudinal direction of the fiber to prevent the shrinkage of the width and the decrease in the adhesive strength, and the touch is good and excellent. The present invention relates to a composite spun long fiber spunbond multilayer nonwoven fabric having flexibility and a method for producing the same.

  In general, the spunbond long fiber nonwoven fabric is a nonwoven fabric produced by spinning a chemical fiber, and is produced by blowing the fibers from the nozzles onto a conveyor that travels to form a long fiber layer on the conveyor. It is a kind of non-woven fabric that has the advantage of being efficient in the manufacturing process and being economical. The melt blown nonwoven fabric refers to a nonwoven fabric produced by a melt blown process, and the web used here is soft because it is an ultrafine fiber, has excellent heat retention, and has a high degree of filtration performance. Although there is a merit that cannot be obtained from this nonwoven fabric, there is a disadvantage that the web strength is extremely low. The raw materials most frequently used in the production process of spunbond and meltblown nonwoven fabrics, which are methods for producing such nonwoven fabrics, are generally polyolefin resins such as polyethylene, polypropylene, polyethylene terephthalate, and polyamide resins, and these resins A fiber is formed by melt spinning, a web is formed, and a non-woven fabric is manufactured by a thermal bonding method.

  However, the above-mentioned conventionally known spunbond nonwoven fabric made of polypropylene long fibers has a drawback that it is not flexible and does not have an excellent touch. For this reason, in order to complement the above drawbacks, it is possible to produce a web by air jetting or fusing polypropylene short fibers, and producing a short fiber nonwoven fabric using a method of bonding with a heated roller or an air-through method. Although proposed, the non-woven fabric produced in this way has a problem that it is inferior in fluff resistance and strength, although it is excellent in the touch, and also due to slimming of sanitary materials. There are disadvantages such as a decrease in productivity and a limitation of physical properties, which is not preferable. The spunbond nonwoven fabric made of polyethylene long fibers is relatively soft and has a good touch, but has a difficulty in spinning, is inferior in strength, and has a high elongation rate, which is high in diapers and physiological conditions. It is not suitable for sanitary materials such as sanitary napkins and industrial materials.

  Therefore, in order to solve the above problems, a spunbond nonwoven fabric made of propylene-based and ethylene-based composite fibers is used as a spunbond nonwoven fabric, and a polyolefin composition of a specific polyolefin-based elastomer and propylene-based polymer is used as a meltblown nonwoven fabric. A flexible non-woven laminate having a spunbond non-woven fabric layer and a meltblown non-woven fabric layer, excellent in uniformity, excellent in flexibility, breathability, and water resistance, and having an adhesive strength between each layer. An excellent flexible nonwoven fabric laminate has been proposed (see, for example, Patent Document 1 below). Further, the polyethylene resin (A) having a high melting point of 120 to 135 ° C., a low melting point of 90 to 125 ° C. which is at least 5 ° C. lower than the high melting point, and a melting point of 10 ° C. than the polyethylene resin (A). A high-melting point resin (B) having a higher weight component ratio (A / B) between the polyethylene-based resin (A) and the higher-melting point resin (B) than 50/50 to 10/90; A composite fiber in which the resin (A) continuously forms at least a part of the fiber surface in the longitudinal direction, preferably a composite fiber nonwoven fabric obtained by using a core-sheath type or side-by-side type composite fiber has been proposed ( For example, see Patent Document 2 below). Further, the composite continuous fiber nonwoven fabric and the production method thereof are low-melting polymers for producing the spunbond nonwoven fabric constituting the outermost layer in order to give the spunbond multilayer nonwoven fabric a soft touch and excellent flexibility. There has been proposed a method in which a melt blown layer is formed between spunbond layers made of core-sheath-type long fibers in the longitudinal direction of polypropylene fibers whose polyethylene fibers are high melting point polymers, and this is thermocompression-bonded (for example, the following (See Patent Document 3). Furthermore, for example, in Patent Document 4 below, there are problems such as a relative increase in elongation caused by the use of polyethylene, which is a low-melting-point polymer, loss in process due to shrinkage of product width, and equipment failure. It is disclosed that the problem can be solved by adding a heat treatment step using hot air.

  However, in the conventional techniques such as Patent Document 1 below, when the content of the ethylene component is increased and the degree of flexibility is increased or the weight of the nonwoven web is decreased, the nonwoven fabric is caused by the flexibility characteristics of the raw material. There are problems such as production line congestion due to frequent failures in high-speed facilities that produce diapers, sanitary napkins, etc., such as laminating agents sticking onto belts or webs being separated.

Republic of Korea Patent Publication No. 2001-0012474 Republic of Korea Patent Publication No. 2001-0034314 Republic of Korea Patent Publication No. 2004-0013756 Republic of Korea Patent Publication No. 2011-0021147

  Therefore, the present invention has been made in view of the above circumstances, and the object thereof is to prevent the composite multilayer nonwoven fabric laminating agent from sticking on the belt and to make it easy to separate the web. By eliminating the problem of peeling of the multilayer nonwoven fabric due to the weight of the fabric being reduced and the flexibility being increased, the web has good uniformity and flexibility with excellent flexibility, breathability, water resistance and adhesive strength between layers. It is in providing a porous composite spunbond long fiber multilayer nonwoven fabric.

  Another object of the present invention is to provide a production method capable of more easily producing a composite spunbond long fiber multilayer nonwoven fabric having the above-mentioned excellent characteristics.

  The present invention also aims to achieve, in addition to the specific objects described above, other objects that can be easily derived from these objects and the general technique of this specification by those skilled in the art. To do.

  In order to achieve the above object, a method for producing a composite spun long fiber spunbond multilayer nonwoven fabric having improved characteristics according to the present invention comprises a spunbond nonwoven fabric as an outermost layer and an inner layer having a single meltblown nonwoven fabric layer. In the method for producing a spunbond multilayer nonwoven fabric, if necessary, at least one spunbond nonwoven fabric layer and a meltblown nonwoven fabric layer may be additionally laminated, or the meltblown layer may not be laminated. In order to enclose the sheath part in the longitudinal direction in the core part, a distribution plate is interposed between the spin beam and the spinning nozzle, and a high melting point polymer or propylene polymer is provided in the core part and a low melting point is provided in the sheath part. A core-sheath type composite continuous fiber is produced by spinning a polymer or an ethylene-based polymer to each nozzle hole side, and spinning the composite long fiber spun An air jet device for facilitating separation of the fiber web and the belt by laminating the fiber web and the belt on a porous continuous belt that is easily separated, and the composite long fiber web And a step of heat-treating a sheet-like material partially fixed by thermocompression bonding and fixed by embossing bonding using a suction drum.

  According to another aspect of the present invention, the core-sheath-type spunbond long fiber nonwoven fabric layer is made of a high-melting polymer melted with a polypropylene resin having a melt index (MI) at 230 ° C. of 30 to 60 g / 10 min. The low melting point polymer obtained by melting a high density polyethylene (HDPE) having a melt index (MI) at 190 ° C. of 25 to 35 g / 10 min and a density of 0.9515 to 0.9565. It is preferable to obtain.

  In this invention, as a propylene polymer, the said propylene homopolymer, a random copolymer, or a block copolymer can be used individually or in combination of 2 or more types. In the present invention, as the low melting point polymer, in addition to the polypropylene, polyethylene, for example, high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE). ) Etc. can be used. The polyolefin polymer suitable for use in the low melting point polymer component is preferably an olefin polymer, as long as it has a low melting point lower than that of the high melting point component polymer depending on the range of the melting temperature. From the viewpoint of commercial availability, polyethylene, polypropylene, or a blend copolymer thereof can be used.

  According to still another aspect of the present invention, the core-sheath-type spunbond continuous fiber nonwoven fabric layer is manufactured by composite melt spinning so that the weight ratio of the core part to the sheath part is 50-50 to 70-30. It is preferable to do.

  According to still another aspect of the present invention, it is preferable that the air injection speed of the air injection device that facilitates separation of the laminated fiber web and belt is an appropriate air speed of 15 to 25 m / s.

  As described above, the manufacturing method of the present invention is characterized in that an air jet device is used to facilitate separation of the laminated nonwoven fabric and the belt, but between the conveyor belt and the calender roll before thermal coupling. A rectangular air injection device in which a large number of holes are formed plays a role of facilitating separation of the laminated nonwoven fabric and the conveyor belt by injecting a predetermined air pressure upward from the upper and lower portions of the belt. The air injection speed of the air injection device needs to be kept at 5 to 30 m / s, particularly preferably 15 to 25 m / s. When the air injection speed is less than 5 m / s, the belt and the nonwoven fabric sheet are not smoothly separated, and when it exceeds 30 m / s, the air pressure is too strong and the sheet is detached. It is not preferable.

  According to still another aspect of the present invention, the heat treatment temperature in the step of heat treating with the suction drum is preferably 80 to 110 ° C. If heat treatment is performed at 80 ° C. or less with a suction drum, there is no thermal setting effect of the low-melting polymer of the meltblown layer and the spunbonded nonwoven filament, so the effect of suppressing the increase in elongation cannot be obtained so much. On the other hand, if heat treatment is performed at 110 ° C. or higher, the soft touch may be damaged.

  The composite spun long fiber spunbond multilayer nonwoven fabric having the improved properties of the present invention for achieving the above-mentioned other objects has a spunbond nonwoven fabric as the outermost layer, and the inner layer has at least one meltblown nonwoven fabric layer, which is necessary The spunbond nonwoven fabric layer in which at least one spunbond nonwoven fabric layer and a melt blown nonwoven fabric layer are additionally laminated according to the above, the spunbond nonwoven fabric layer constituting the outermost layer has a low melting point polymer and a high melting point weight. It is made of a core-sheath-type long fiber surrounding the coalescence in the longitudinal direction of the fiber, a melt-blown non-woven layer is formed between the core-sheath-type long-fiber spunbonded non-woven layers, and the web is laminated on a continuous belt After being formed and passed through an air injection device that makes it easy to separate the fiber web and belt, it is bonded by thermocompression bonding with a calender roll. After being prepared into a sheet, characterized in that one produced are heat treated in a suction type drum.

  According to another aspect of the present invention, the basis weight of the nonwoven fabric forming the meltblown nonwoven fabric layer between the spunbond nonwoven fabric layers is preferably 0.5 to 2.0 gsm / m <SUP> 2 </ SUP>. If the basis weight of the melt blown nonwoven fabric is less than 0.5 g / m <SUP> 2 </ SUP>, the liquid cannot be blocked because the structure is not dense, and 2.0 g / m <SUP> 2 < If it exceeds / SUP>, the structure becomes dense and effective in blocking the permeation of the synthetic resin, but there is a problem that the soft touch is not exhibited, which is not preferable.

  According to still another aspect of the present invention, a composite spunbond long fiber multilayer nonwoven fabric having improved characteristics according to the present invention is a disposable diaper, a side gather of a sanitary napkin, a back sheet, and a hydrophilic processed top sheet. It is preferable that it is what is used for uses, such as.

  According to the composite spun long fiber spunbond multilayer nonwoven fabric of the present invention and the production method thereof, the composite multilayer nonwoven fabric laminating agent can be easily separated without sticking on the belt. A flexible composite spunbond long-fiber multilayer nonwoven fabric with excellent web uniformity, excellent flexibility, breathability, water resistance and adhesive strength between layers Can be manufactured. Therefore, the nonwoven fabric of the present invention is not only used in various applications where a nonwoven fabric has been used conventionally, but also used in applications such as disposable diapers, side gathers of sanitary napkins, back sheets, and hydrophilic processed top sheets. It is done.

1 is a schematic illustration of a two-component spinning system used in accordance with the present invention to form a spunbond nonwoven. It is the schematic of the air injection apparatus which is used according to this invention and makes it easy to isolate | separate a laminated nonwoven fabric and a belt.

  The term “non-woven or non-woven” as used in the present invention means a fiber or web of filaments formed by means other than knitting or weaving, and including some or all of the fibers or filaments, and such bonds Can be formed, for example, by thermal, adhesive or mechanical means such as tangles. Conventional nonwovens are formed by spunbond, meltblown, carding, wet lay and air lay processes.

  The term “spunbond” as used in the present invention is usually collected on a surface formed from streaks that have been quenched and stretched by high-speed air by melt extrusion of a polymer extrudate, often a pattern of heat and pressure. It means a non-woven or non-woven fabric of filaments reinforced with bonded filaments by a modified application.

  The two-component polymer of the present invention can be broadly classified into a high-melting polymer and a low-melting polymer, and the high-melting polymer has a melting point of 5 ° C. or higher than the polymer of other components of the long fiber, preferably Means a resin having a melting point higher by 10 ° C. or higher. In the present invention, a polypropylene resin is used as the high melting point polymer because it is flexible and has excellent strength. This resin is a polymer containing 90 mol% or more, preferably 95 mol% or more of a structural unit derived from propylene.

  As used herein, the terms “composite” and “multicomponent” are used interchangeably and each result in two or more separate sections occupied by individual polymer components along the entire length of the fiber or filament. By fibers or filaments and multiple extrudates are meant fibers or filaments formed. As the cross section of the fiber, various arrangements such as a side-by-side type, a pie type, a sheath core type, an eccentric sheath core type, and a sea-island type are taken.

  Of particular interest in the present invention is the sheath core arrangement.

  As described above, the method for producing a composite spunbond long fiber multilayer nonwoven fabric having improved properties according to the present invention combines the flexible properties of polyethylene long fibers with the low elongation and high strength properties of polypropylene long fibers. In order to provide a composite spunbond long fiber multilayer nonwoven fabric that is soft and excellent in liquid barrier properties and has excellent mechanical properties to eliminate the conventional problems, A spunbonded non-woven fabric layer is laminated, and at least one meltblown non-woven fabric layer is additionally laminated on the spunbonded non-woven fabric layer, and then a spunbonded non-woven fabric layer is further laminated. In particular, the spunbond long-fiber multilayer nonwoven fabric of the present invention is not limited to a specific layer configuration, for example, a single layer (melt blown layer M or spunbond layer S) or two layer (SS or SM) composite Or a composite layer of three or more layers (SMS, SMMS, SSMMS, SSMMSS web). Each of the single layers may have a significantly different weight (gsm).

  According to a preferred embodiment of the present invention, as the polymer for producing the long fiber spunbond nonwoven fabric, polyolefin, polyester, polyamide, a copolymer of these (olefin, ester, amide or other monomer), and these A thermoplastic or spinnable polymer selected from the group consisting of:

[Production method]
Next, a process line for producing a composite spunbond long fiber multilayer nonwoven fabric will be described with reference to the drawings. FIG. 1 is a schematic illustration of a two-component spinning system used in accordance with the present invention to form a spunbond nonwoven.

  As shown in FIG. 1, in the exemplary production process of the nonwoven web according to the present invention, first, a two-component polymer is melted to produce a long fiber spunbond nonwoven fabric. The two-component polymer is produced by kneading the melted polymers in the respective extruders 1 and 2. The polymer core component is fed from the first hopper 1) -1 to the extruder, and optionally the polymer sheath component is fed from the second hopper 2) -1 to the extruder. The molten component polymer is conveyed from the individual extruders 1) and 2) via the respective polymer conduits to the spin beam 3). The shape of the spinneret for spinning the bicomponent filament is known to those skilled in the art, and therefore, detailed description thereof is omitted in the present invention. Next, in the process line A, the filaments spun so as to be adjacent to the filament curtain extending from the spinning nozzle 4) are solidified by the cooling air sprayed through the honeycomb-shaped cooling chamber 5). Thereafter, the web is stretched by the pressure of the air blown from the upper part and the air sucked in the lower part of the conveyor belt, and laminated on the porous special conveyor belt 9 easily separated by a predetermined weight to form a web.

  The method for producing a melt blown nonwoven fabric is a known method that is usually used in the technical field to which the present invention belongs, and when a polypropylene resin having a melt index (MI) of 800 to 1300 g / 10 min is melted and spun through a large number of orifices. Ultrafine yarn is produced by blowing strong hot air from both sides of the base. At this time, in order not to lower the adhesive strength of the spunbond layer and the meltblown layer, the basis weight of the meltblown nonwoven fabric is preferably 0.3 to 2 gsm / m <SUP> 2 </ SUP>, more preferably 0. .5 to 1.5 gsm / m <SUP> 2 </ SUP>. If the basis weight of the melt blown nonwoven fabric is less than 0.3 gsm / m <SUP> 2 </ SUP>, the structure is not dense and the liquid cannot be blocked, and 2 gsm / m <SUP> 2 </ SUP> If it exceeds, the structure becomes dense and effective in blocking the permeation of the synthetic resin, but there is a problem that it does not show a soft touch.

  In the present invention, the fineness of the composite spunbond long fiber nonwoven fabric is 5.0 d or less, preferably 3.0 d or less, more preferably 2.0 d or less. This is because the nonwoven fabric has flexibility as long as it has the fineness described above. In addition, the fiber which comprises a melt blown nonwoven fabric has a thickness of 1-5 micrometers. This is because when the fiber is thick, there is a disadvantage that the strength and the touch are lowered.

  FIG. 2 is a schematic diagram of an air injection device (10 in FIG. 1) used according to the present invention to facilitate separation of the laminated nonwoven fabric and the belt. As shown in FIG. 2, a rectangular air injection device B-3 in which a number of holes are formed between the conveyor belt B-1 and the calender roll before heat coupling is formed upward from the upper and lower portions of the belt. Air pressure is injected to separate the laminated nonwoven fabric B-2 and the conveyor belt B-1. The air injection speed of the air injection device needs to be maintained at 5 to 30 m / s. When the air injection speed is less than 5 m / s, the belt and the nonwoven fabric sheet are not smoothly separated, and when it exceeds 30 m / s, the air pressure is too strong and the sheet is detached. It is not preferable.

  Basic multi-layered nonwoven fabric has a spunbond nonwoven layer laminated on a continuously driven conveyor belt, a meltblown nonwoven layer on the spunbond nonwoven layer, and finally a spunbond nonwoven layer laminated Is done.

  Nonwoven fabrics laminated in this way are thermally bonded to provide mechanical properties and form stability. In other words, heat and pressure are applied through a thermal calendar to be thermally adhered to form a sheet. At this time, the calender roll does not limit the bonding area, but one surface is usually constituted by an embossing roll 11 having a bonding area of 10 to 20%, and the other surface is a surface. Is constituted by a smooth roll 12. If the temperature of the roll exceeds a predetermined level, the sheet is heat-sealed to the heating roll, making it impossible to produce the sheet, and if the temperature is too low, the physical properties of the sheet will be lowered. For this reason, it is preferable that the thermal temperature of a calender roll is 120 to 160 degreeC, More preferably, it is 130 to 150 degreeC.

  The non-woven fabric sheet that has been thermally bonded is heat-treated with a hot-air suction drum, and the low melting point that forms the sheath type of the melt-blown layer and the spun-bonded non-woven filament dispersed in the spun-bond layer by such heat treatment A composite spunbond long fiber multilayer nonwoven fabric excellent in mechanical properties is obtained while maintaining a soft touch which is an inherent physical property of the low melting point polymer by setting the polymer thermally. The temperature of the hot air at this time is preferably 70 ° C to 120 ° C, more preferably 80 ° C to 110 ° C. Below 80 ° C, the low-melting polymer of the meltblown layer and the spunbond nonwoven filament has no thermal setting effect, so the effect of suppressing the increase in elongation is not so much obtained. Above 110 ° C, the soft touch is damaged. This is not preferable because there is a risk of this.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated more concretely, it cannot be overemphasized 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 performed as follows, and the results are shown in Table 1 below.

  (1) Tensile strength / elongation: Instron's tensile strength / elongation measuring equipment is used and the size of the test piece is set to 5 cm (width) × 20 cm (length) in accordance with the EDANA 20.2-89 method. The measurement was performed under conditions where the pulling speed was 500 m / min.

  (2) Water pressure resistance: Using a FX-3000 testing machine, water pressure resistance was measured for nonwoven fabrics by the DIN 53,886 method.

  (3) Bending softness: Bending softness was measured with a measuring method of WSP90.5 nonwoven fabric bending length using a bending length measuring machine.

Example 1
A two-component spinning line was used. At this time, the extruder was 150 mm around the outer wall, L / D was 30, the nozzle had a nozzle diameter of 0.6 mm, and L / D was 4. , With 5000 holes per meter. The conveyor belt used is a Suprastat 4000 manufactured by COFPA having an air permeability unit of 8910 m <SUP> 3 </ SUP> / m <SUP> 2 </ SUP> / Hr (100 Pa). Used to facilitate separation.

  The high melting point polymer is obtained by melting a polypropylene resin having a melt index (MI) at 230 ° C. of about 45 g / 10 min, and the low melting point polymer has a melt index (MI) at 190 ° C. of about 30 g / 10. And is obtained by melting high density polyethylene (HDPE) having a density of 0.9515 to 0.9565, performing core-sheath type composite melt spinning, and the sheath part is high density polyethylene (HDPE), The outermost layer is a spunbonded nonwoven fabric having a weight ratio of 50/50 between the sheath and the core, and the basis weight of the meltblown nonwoven fabric is 0.8 g / m <SUP> 2 </ SUP> After the spunbond / meltblown / meltblown / spunbond layers are laminated in this order on the conveyor belt, the rectangular air jet used for sheet separation The air release speed of the apparatus was maintained at about 20 m / s. After thermocompression bonding with a calender roll, a non-woven fabric having a temperature of 100 ° C. and heat treatment with a 60% hot air suction drum was obtained having a basis weight of 15 g / m <SUP> 2 </ SUP>.

Example 2
A nonwoven fabric was produced in the same manner as in Example 1 except that the ratio of the raw material of the sheath / core was 30/70.

Example 3
The total basis weight is 15 g / m <SUP> 2 </ SUP> in the same manner as in Example 1 except that only the melt-blown nonwoven fabric basis weight is 1.5 g / m <SUP> 2 </ SUP>. A non-woven fabric was produced.

Example 4
The total basis weight is 12 g / m <SUP> 2 </ SUP> in the same manner as in Example 1 except that the basis weight of the melt blown nonwoven fabric is only 1.5 g / m <SUP> 2 </ SUP>. A non-woven fabric was produced.

Comparative Example 1
The total basis weight is 15 g / m <SUP> 2 </ SUP> in the same manner as in Example 1 except that only the melt-blown nonwoven fabric basis weight is 0.0 g / m <SUP> 2 </ SUP>. A non-woven fabric was produced.

Comparative Example 2
The total basis weight is 15 g / m <SUP> 2 </ SUP> in the same manner as in Example 1 except that only the melt blown nonwoven fabric has a basis weight of 3.5 g / m <SUP> 2 </ SUP>. A non-woven fabric was produced.

Comparative Example 3
A nonwoven fabric was produced in the same manner as in Example 4 except that only the air discharge speed of the air injection device for separating the sheet was maintained at less than 5 m / s.

Comparative Example 4
A nonwoven fabric was produced in the same manner as in Example 1 except that no heat treatment was performed using a hot air suction drum.

DESCRIPTION OF SYMBOLS 1, 2 ... Extruder 3 ... Spin beam 4 ... Spinning nozzle 5 ... Cooling chamber B-1 ... Conveyor belt B-2 ... Laminated nonwoven fabric B-3 ... Air injection apparatus

  The present invention relates to a composite spun long fiber spunbond nonwoven fabric having improved properties and a method for producing the same, and more particularly, the spunbond nonwoven fabric is an outermost layer, and the inner layer has a single meltblown nonwoven fabric layer. At least one spunbond nonwoven fabric layer and a meltblown nonwoven fabric layer are additionally laminated, or a spunbond multilayer nonwoven fabric in which a meltblown layer may not be laminated, and constitutes the outermost layer of the nonwoven fabric The spunbond nonwoven fabric is a core-sheath-type long fiber in which the low-melting polymer surrounds the high-melting polymer in the longitudinal direction of the fiber to prevent the shrinkage of the width and the decrease in the adhesive strength, and the touch is good and excellent. The present invention relates to a composite spun long fiber spunbond multilayer nonwoven fabric having flexibility and a method for producing the same.

  In general, the spunbond long fiber nonwoven fabric is a nonwoven fabric produced by spinning a chemical fiber, and is produced by blowing the fibers from the nozzles onto a conveyor that travels to form a long fiber layer on the conveyor. It is a kind of non-woven fabric that has the advantage of being efficient in the manufacturing process and being economical. The melt blown nonwoven fabric refers to a nonwoven fabric produced by a melt blown process, and the web used here is soft because it is an ultrafine fiber, has excellent heat retention, and has a high degree of filtration performance. Although there is a merit that cannot be obtained from this nonwoven fabric, there is a disadvantage that the web strength is extremely low. The raw materials most frequently used in the production process of spunbond and meltblown nonwoven fabrics, which are methods for producing such nonwoven fabrics, are generally polyolefin resins such as polyethylene, polypropylene, polyethylene terephthalate, and polyamide resins, and these resins A fiber is formed by melt spinning, a web is formed, and a non-woven fabric is manufactured by a thermal bonding method.

  However, the above-mentioned conventionally known spunbond nonwoven fabric made of polypropylene long fibers has a drawback that it is not flexible and does not have an excellent touch. For this reason, in order to complement the above drawbacks, it is possible to produce a web by air jetting or fusing polypropylene short fibers, and producing a short fiber nonwoven fabric using a method of bonding with a heated roller or an air-through method. Although proposed, the non-woven fabric produced in this way has a problem that it is inferior in fluff resistance and strength, although it is excellent in the touch, and also due to slimming of sanitary materials. There are disadvantages such as a decrease in productivity and a limitation of physical properties, which is not preferable. The spunbond nonwoven fabric made of polyethylene long fibers is relatively soft and has a good touch, but has a difficulty in spinning, is inferior in strength, and has a high elongation rate, which is high in diapers and physiological conditions. It is not suitable for sanitary materials such as sanitary napkins and industrial materials.

  Therefore, in order to solve the above problems, a spunbond nonwoven fabric made of propylene-based and ethylene-based composite fibers is used as a spunbond nonwoven fabric, and a polyolefin composition of a specific polyolefin-based elastomer and propylene-based polymer is used as a meltblown nonwoven fabric. A flexible non-woven laminate having a spunbond non-woven fabric layer and a meltblown non-woven fabric layer, excellent in uniformity, excellent in flexibility, breathability, and water resistance, and having an adhesive strength between each layer. An excellent flexible nonwoven fabric laminate has been proposed (see, for example, Patent Document 1 below). Further, the polyethylene resin (A) having a high melting point of 120 to 135 ° C., a low melting point of 90 to 125 ° C. which is at least 5 ° C. lower than the high melting point, and a melting point of 10 ° C. than the polyethylene resin (A). A high-melting point resin (B) having a higher weight component ratio (A / B) between the polyethylene-based resin (A) and the higher-melting point resin (B) than 50/50 to 10/90; A composite fiber in which the resin (A) continuously forms at least a part of the fiber surface in the longitudinal direction, preferably a composite fiber nonwoven fabric obtained by using a core-sheath type or side-by-side type composite fiber has been proposed ( For example, see Patent Document 2 below). Further, the composite continuous fiber nonwoven fabric and the production method thereof are low-melting polymers for producing the spunbond nonwoven fabric constituting the outermost layer in order to give the spunbond multilayer nonwoven fabric a soft touch and excellent flexibility. There has been proposed a method in which a melt blown layer is formed between spunbond layers made of core-sheath-type long fibers in the longitudinal direction of polypropylene fibers whose polyethylene fibers are high melting point polymers, and this is thermocompression-bonded (for example, the following (See Patent Document 3). Furthermore, for example, in Patent Document 4 below, there are problems such as a relative increase in elongation caused by the use of polyethylene, which is a low-melting-point polymer, loss in process due to shrinkage of product width, and equipment failure. It is disclosed that the problem can be solved by adding a heat treatment step using hot air.

  However, in the conventional techniques such as Patent Document 1 below, when the content of the ethylene component is increased and the degree of flexibility is increased or the weight of the nonwoven web is decreased, the nonwoven fabric is caused by the flexibility characteristics of the raw material. There are problems such as production line congestion due to frequent failures in high-speed facilities that produce diapers, sanitary napkins, etc., such as laminating agents sticking onto belts or webs being separated.

Republic of Korea Patent Publication No. 2001-0012474 Republic of Korea Patent Publication No. 2001-0034314 Republic of Korea Patent Publication No. 2004-0013756 Republic of Korea Patent Publication No. 2011-0021147

  Therefore, the present invention has been made in view of the above circumstances, and the object thereof is to prevent the composite multilayer nonwoven fabric laminating agent from sticking on the belt and to make it easy to separate the web. By eliminating the problem of peeling of the multilayer nonwoven fabric due to the weight of the fabric being reduced and the flexibility being increased, the web has good uniformity and flexibility with excellent flexibility, breathability, water resistance and adhesive strength between layers. It is in providing a porous composite spunbond long fiber multilayer nonwoven fabric.

  Another object of the present invention is to provide a production method capable of more easily producing a composite spunbond long fiber multilayer nonwoven fabric having the above-mentioned excellent characteristics.

  The present invention also aims to achieve, in addition to the specific objects described above, other objects that can be easily derived from these objects and the general technique of this specification by those skilled in the art. To do.

  In order to achieve the above object, a method for producing a composite spun long fiber spunbond multilayer nonwoven fabric having improved characteristics according to the present invention comprises a spunbond nonwoven fabric as an outermost layer and an inner layer having a single meltblown nonwoven fabric layer. In the method for producing a spunbond multilayer nonwoven fabric, if necessary, at least one spunbond nonwoven fabric layer and a meltblown nonwoven fabric layer may be additionally laminated, or the meltblown layer may not be laminated. In order to enclose the sheath part in the longitudinal direction in the core part, a distribution plate is interposed between the spin beam and the spinning nozzle, and a high melting point polymer or propylene polymer is provided in the core part and a low melting point is provided in the sheath part. A core-sheath type composite continuous fiber is produced by spinning a polymer or an ethylene-based polymer to each nozzle hole side, and spinning the composite long fiber spun An air jet device for facilitating separation of the fiber web and the belt by laminating the fiber web and the belt on a porous continuous belt that is easily separated, and the composite long fiber web And a step of heat-treating a sheet-like material partially fixed by thermocompression bonding and fixed by embossing bonding using a suction drum.

  According to another aspect of the present invention, the core-sheath-type spunbond long fiber nonwoven fabric layer is made of a high-melting polymer melted with a polypropylene resin having a melt index (MI) at 230 ° C. of 30 to 60 g / 10 min. The low melting point polymer obtained by melting a high density polyethylene (HDPE) having a melt index (MI) at 190 ° C. of 25 to 35 g / 10 min and a density of 0.9515 to 0.9565. It is preferable to obtain.

  In this invention, as a propylene polymer, the said propylene homopolymer, a random copolymer, or a block copolymer can be used individually or in combination of 2 or more types. In the present invention, as the low melting point polymer, in addition to the polypropylene, polyethylene, for example, high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE). ) Etc. can be used. The polyolefin polymer suitable for use in the low melting point polymer component is preferably an olefin polymer, as long as it has a low melting point lower than that of the high melting point component polymer depending on the range of the melting temperature. From the viewpoint of commercial availability, polyethylene, polypropylene, or a blend copolymer thereof can be used.

  According to still another aspect of the present invention, the core-sheath-type spunbond continuous fiber nonwoven fabric layer is manufactured by composite melt spinning so that the weight ratio of the core part to the sheath part is 50-50 to 70-30. It is preferable to do.

  According to still another aspect of the present invention, it is preferable that the air injection speed of the air injection device that facilitates separation of the laminated fiber web and belt is an appropriate air speed of 15 to 25 m / s.

  As described above, the manufacturing method of the present invention is characterized in that an air jet device is used to facilitate separation of the laminated nonwoven fabric and the belt, but between the conveyor belt and the calender roll before thermal coupling. A rectangular air injection device in which a large number of holes are formed plays a role of facilitating separation of the laminated nonwoven fabric and the conveyor belt by injecting a predetermined air pressure upward from the upper and lower portions of the belt. The air injection speed of the air injection device needs to be kept at 5 to 30 m / s, particularly preferably 15 to 25 m / s. When the air injection speed is less than 5 m / s, the belt and the nonwoven fabric sheet are not smoothly separated, and when it exceeds 30 m / s, the air pressure is too strong and the sheet is detached. It is not preferable.

  According to still another aspect of the present invention, the heat treatment temperature in the step of heat treating with the suction drum is preferably 80 to 110 ° C. If heat treatment is performed at 80 ° C. or less with a suction drum, there is no thermal setting effect of the low-melting polymer of the meltblown layer and the spunbonded nonwoven filament, so the effect of suppressing the increase in elongation cannot be obtained so much. On the other hand, if heat treatment is performed at 110 ° C. or higher, the soft touch may be damaged.

  The composite spun long fiber spunbond multilayer nonwoven fabric having the improved properties of the present invention for achieving the above-mentioned other objects has a spunbond nonwoven fabric as the outermost layer, and the inner layer has at least one meltblown nonwoven fabric layer, which is necessary The spunbond nonwoven fabric layer in which at least one spunbond nonwoven fabric layer and a melt blown nonwoven fabric layer are additionally laminated according to the above, the spunbond nonwoven fabric layer constituting the outermost layer has a low melting point polymer and a high melting point weight. It is made of a core-sheath-type long fiber surrounding the coalescence in the longitudinal direction of the fiber, a melt-blown non-woven layer is formed between the core-sheath-type long-fiber spunbonded non-woven layers, and the web is laminated on a continuous belt After being formed and passed through an air injection device that makes it easy to separate the fiber web and belt, it is bonded by thermocompression bonding with a calender roll. After being prepared into a sheet, characterized in that one produced are heat treated in a suction type drum.

According to the other situation of this invention, it is preferable that the fabric weight of the nonwoven fabric which forms the melt blown nonwoven fabric layer between the said spun bond nonwoven fabric layers is 0.5-2.0 gsm / m < ² >. If the basis weight of the melt blown nonwoven fabric is less than 0.5 g / m ² , the structure is not dense and the liquid cannot be blocked. If the basis weight exceeds 2.0 g / m ² , the structure becomes dense and the synthetic resin Although it is effective in blocking the transmission of light, it is not preferred because it has a problem of not showing a soft touch.

  According to still another aspect of the present invention, a composite spunbond long fiber multilayer nonwoven fabric having improved characteristics according to the present invention is a disposable diaper, a side gather of a sanitary napkin, a back sheet, and a hydrophilic processed top sheet. It is preferable that it is what is used for uses, such as.

  According to the composite spun long fiber spunbond multilayer nonwoven fabric of the present invention and the production method thereof, the composite multilayer nonwoven fabric laminating agent can be easily separated without sticking on the belt. A flexible composite spunbond long-fiber multilayer nonwoven fabric with excellent web uniformity, excellent flexibility, breathability, water resistance and adhesive strength between layers Can be manufactured. Therefore, the nonwoven fabric of the present invention is not only used in various applications where a nonwoven fabric has been used conventionally, but also used in applications such as disposable diapers, side gathers of sanitary napkins, back sheets, and hydrophilic processed top sheets. It is done.

1 is a schematic illustration of a two-component spinning system used in accordance with the present invention to form a spunbond nonwoven. It is the schematic of the air injection apparatus which is used according to this invention and makes it easy to isolate | separate a laminated nonwoven fabric and a belt.

  The term “non-woven or non-woven” as used in the present invention means a fiber or web of filaments formed by means other than knitting or weaving, and including some or all of the fibers or filaments, and such bonds Can be formed, for example, by thermal, adhesive or mechanical means such as tangles. Conventional nonwovens are formed by spunbond, meltblown, carding, wet lay and air lay processes.

  The term “spunbond” as used in the present invention is usually collected on a surface formed from streaks that have been quenched and stretched by high-speed air by melt extrusion of a polymer extrudate, often a pattern of heat and pressure. It means a non-woven or non-woven fabric of filaments reinforced with bonded filaments by a modified application.

  The two-component polymer of the present invention can be broadly classified into a high-melting polymer and a low-melting polymer, and the high-melting polymer has a melting point of 5 ° C. or higher than the polymer of other components of the long fiber, preferably Means a resin having a melting point higher by 10 ° C. or higher. In the present invention, a polypropylene resin is used as the high melting point polymer because it is flexible and has excellent strength. This resin is a polymer containing 90 mol% or more, preferably 95 mol% or more of a structural unit derived from propylene.

  As used herein, the terms “composite” and “multicomponent” are used interchangeably and each result in two or more separate sections occupied by individual polymer components along the entire length of the fiber or filament. By fibers or filaments and multiple extrudates are meant fibers or filaments formed. As the cross section of the fiber, various arrangements such as a side-by-side type, a pie type, a sheath core type, an eccentric sheath core type, and a sea-island type are taken.

  Of particular interest in the present invention is the sheath core arrangement.

  As described above, the method for producing a composite spunbond long fiber multilayer nonwoven fabric having improved properties according to the present invention combines the flexible properties of polyethylene long fibers with the low elongation and high strength properties of polypropylene long fibers. In order to provide a composite spunbond long fiber multilayer nonwoven fabric that is soft and excellent in liquid barrier properties and has excellent mechanical properties to eliminate the conventional problems, A spunbonded non-woven fabric layer is laminated, and at least one meltblown non-woven fabric layer is additionally laminated on the spunbonded non-woven fabric layer, and then a spunbonded non-woven fabric layer is further laminated. In particular, the spunbond long-fiber multilayer nonwoven fabric of the present invention is not limited to a specific layer configuration, for example, a single layer (melt blown layer M or spunbond layer S) or two layer (SS or SM) composite Or a composite layer of three or more layers (SMS, SMMS, SSMMS, SSMMSS web). Each of the single layers may have a significantly different weight (gsm).

  According to a preferred embodiment of the present invention, as the polymer for producing the long fiber spunbond nonwoven fabric, polyolefin, polyester, polyamide, a copolymer of these (olefin, ester, amide or other monomer), and these A thermoplastic or spinnable polymer selected from the group consisting of:

[Production method]
Next, a process line for producing a composite spunbond long fiber multilayer nonwoven fabric will be described with reference to the drawings. FIG. 1 is a schematic illustration of a two-component spinning system used in accordance with the present invention to form a spunbond nonwoven.

  As shown in FIG. 1, in the exemplary production process of the nonwoven web according to the present invention, first, a two-component polymer is melted to produce a long fiber spunbond nonwoven fabric. The two-component polymer is produced by kneading the melted polymers in the respective extruders 1 and 2. The polymer core component is fed from the first hopper 1) -1 to the extruder, and optionally the polymer sheath component is fed from the second hopper 2) -1 to the extruder. The molten component polymer is conveyed from the individual extruders 1) and 2) via the respective polymer conduits to the spin beam 3). The shape of the spinneret for spinning the bicomponent filament is known to those skilled in the art, and therefore, detailed description thereof is omitted in the present invention. Next, in the process line A, the filaments spun so as to be adjacent to the filament curtain extending from the spinning nozzle 4) are solidified by the cooling air sprayed through the honeycomb-shaped cooling chamber 5). Thereafter, the web is stretched by the pressure of the air blown from the upper part and the air sucked in the lower part of the conveyor belt, and laminated on the porous special conveyor belt 9 easily separated by a predetermined weight to form a web.

The method for producing a melt blown nonwoven fabric is a known method that is usually used in the technical field to which the present invention belongs, and when a polypropylene resin having a melt index (MI) of 800 to 1300 g / 10 min is melted and spun through a large number of orifices. Ultrafine yarn is produced by blowing strong hot air from both sides of the base. At this time, in order not to lower the adhesive strength of the spunbond layer and the meltblown layer, the basis weight of the meltblown nonwoven fabric is preferably 0.3 to ² gsm / m ² , more preferably 0.5 to 1.5 gsm / m ² . If the basis weight of the melt blown nonwoven fabric is less than 0.3 gsm / m ² , the structure is not dense and the liquid cannot be blocked. If the basis weight exceeds ² gsm / m ² , the structure becomes dense and the synthetic resin is blocked from transmitting. Although effective, it has a problem of not showing a soft touch.

  In the present invention, the fineness of the composite spunbond long fiber nonwoven fabric is 5.0 d or less, preferably 3.0 d or less, more preferably 2.0 d or less. This is because the nonwoven fabric has flexibility as long as it has the fineness described above. In addition, the fiber which comprises a melt blown nonwoven fabric has a thickness of 1-5 micrometers. This is because when the fiber is thick, there is a disadvantage that the strength and the touch are lowered.

  FIG. 2 is a schematic diagram of an air injection device (10 in FIG. 1) used according to the present invention to facilitate separation of the laminated nonwoven fabric and the belt. As shown in FIG. 2, a rectangular air injection device B-3 in which a number of holes are formed between the conveyor belt B-1 and the calender roll before heat coupling is formed upward from the upper and lower portions of the belt. Air pressure is injected to separate the laminated nonwoven fabric B-2 and the conveyor belt B-1. The air injection speed of the air injection device needs to be maintained at 5 to 30 m / s. When the air injection speed is less than 5 m / s, the belt and the nonwoven fabric sheet are not smoothly separated, and when it exceeds 30 m / s, the air pressure is too strong and the sheet is detached. It is not preferable.

  Basic multi-layered nonwoven fabric has a spunbond nonwoven layer laminated on a continuously driven conveyor belt, a meltblown nonwoven layer on the spunbond nonwoven layer, and finally a spunbond nonwoven layer laminated Is done.

  Nonwoven fabrics laminated in this way are thermally bonded to provide mechanical properties and form stability. In other words, heat and pressure are applied through a thermal calendar to be thermally adhered to form a sheet. At this time, the calender roll does not limit the bonding area, but one surface is usually constituted by an embossing roll 11 having a bonding area of 10 to 20%, and the other surface is a surface. Is constituted by a smooth roll 12. If the temperature of the roll exceeds a predetermined level, the sheet is heat-sealed to the heating roll, making it impossible to produce the sheet, and if the temperature is too low, the physical properties of the sheet will be lowered. For this reason, it is preferable that the thermal temperature of a calender roll is 120 to 160 degreeC, More preferably, it is 130 to 150 degreeC.

  The non-woven fabric sheet that has been thermally bonded is heat-treated with a hot-air suction drum, and the low melting point that forms the sheath type of the melt-blown layer and the spun-bonded non-woven filament dispersed in the spun-bond layer by such heat treatment A composite spunbond long fiber multilayer nonwoven fabric excellent in mechanical properties is obtained while maintaining a soft touch which is an inherent physical property of the low melting point polymer by setting the polymer thermally. The temperature of the hot air at this time is preferably 70 ° C to 120 ° C, more preferably 80 ° C to 110 ° C. Below 80 ° C, the low-melting polymer of the meltblown layer and the spunbond nonwoven filament has no thermal setting effect, so the effect of suppressing the increase in elongation is not so much obtained. Above 110 ° C, the soft touch is damaged. This is not preferable because there is a risk of this.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated more concretely, it cannot be overemphasized 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 performed as follows, and the results are shown in Table 1 below.

  (1) Tensile strength / elongation: Instron's tensile strength / elongation measuring equipment is used and the size of the test piece is set to 5 cm (width) × 20 cm (length) in accordance with the EDANA 20.2-89 method. The measurement was performed under conditions where the pulling speed was 500 m / min.

  (2) Water pressure resistance: Using a FX-3000 testing machine, water pressure resistance was measured for nonwoven fabrics by the DIN 53,886 method.

  (3) Bending softness: Bending softness was measured with a measuring method of WSP90.5 nonwoven fabric bending length using a bending length measuring machine.

Example 1
A two-component spinning line was used. At this time, the extruder was 150 mm around the outer wall, L / D was 30, the nozzle had a nozzle diameter of 0.6 mm, and L / D was 4. , With 5000 holes per meter. The conveyor belt used was Suprastat 4000 manufactured by COFPA having an air permeability unit of 8910 m ³ / m ² / Hr (100 Pa), and was used to facilitate separation of the fiber sheet and the belt.

The high melting point polymer is obtained by melting a polypropylene resin having a melt index (MI) at 230 ° C. of about 45 g / 10 min, and the low melting point polymer has a melt index (MI) at 190 ° C. of about 30 g / 10. And is obtained by melting high density polyethylene (HDPE) having a density of 0.9515 to 0.9565, performing core-sheath type composite melt spinning, and the sheath part is high density polyethylene (HDPE), parts is polypropylene resin, the weight ratio of the sheath part and the core part is the outermost layer of the spunbonded nonwoven fabric is a 50/50, spunbond / meltblown / meltblown basis weight of the meltblown nonwoven fabric is 0.8 g / m ² / After laminating the spunbond layer in this order on the conveyor belt, the air release speed of the rectangular air jet used for separating the sheets is It was maintained at 20m / s. After thermocompression bonding with a calender roll, the nonwoven fabric had a temperature of 100 ° C. and was heat-treated with a 60% hot air suction drum to give a basis weight of 15 g / m ² .

Example 2
A nonwoven fabric was produced in the same manner as in Example 1 except that the ratio of the raw material of the sheath / core was 30/70.

Example 3
A nonwoven fabric having a total basis weight of 15 g / m ² was produced in the same manner as in Example 1 except that only the melt-blown nonwoven fabric weight was 1.5 g / m ² .

Example 4
A nonwoven fabric having a total basis weight of 12 g / m ² was produced in the same manner as in Example 1 except that only the basis weight of the melt blown nonwoven fabric was 1.5 g / m ² .

Comparative Example 1
Except that the only basis weight meltblown nonwoven fabric 0.0 g / m ^2, as in the method of Example 1, the basis weight of the total were manufactured nonwoven fabric is 15 g / m ^2.

Comparative Example 2
A non-woven fabric having a total basis weight of 15 g / m ² was produced in the same manner as in Example 1 except that only the melt-blown non-woven fabric basis weight was 3.5 g / m ² .

Comparative Example 3
A nonwoven fabric was produced in the same manner as in Example 4 except that only the air discharge speed of the air injection device for separating the sheet was maintained at less than 5 m / s.

Comparative Example 4
A nonwoven fabric was produced in the same manner as in Example 1 except that no heat treatment was performed using a hot air suction drum.

DESCRIPTION OF SYMBOLS 1, 2 ... Extruder 3 ... Spin beam 4 ... Spinning nozzle 5 ... Cooling chamber B-1 ... Conveyor belt B-2 ... Laminated nonwoven fabric B-3 ... Air injection apparatus

Claims (8)

The spunbond nonwoven fabric is the outermost layer, and the inner layer has one meltblown nonwoven fabric layer, and if necessary, at least one or more spunbond nonwoven fabric layers and meltblown nonwoven fabric layers are additionally laminated, or a meltblown layer In the method for producing a spunbond multilayer nonwoven fabric that may not be laminated,
In the production method, in order to surround the sheath portion in the longitudinal direction in the core portion, a distribution plate is interposed between the spin beam and the spinning nozzle, and a high melting point polymer or propylene polymer is disposed in the core portion. A core-sheath type composite continuous fiber is produced by guiding a low melting point polymer or an ethylene polymer to each nozzle hole side and spinning it, and the fiber web and belt are separated from the spun composite long fiber. An air jet device that makes it easy to separate the fiber web and the belt by laminating on an easy porous continuous belt to form a composite long fiber web, and partially heat-compressing the composite long fiber web. Manufacture of composite spunbond long fiber multilayer nonwoven fabric with improved properties, comprising the step of heat treating winding a sheet-like material fixed by embossing bonding with a suction drum Law.   The method for producing a composite spunbond long fiber multilayer nonwoven fabric having improved characteristics according to claim 1, wherein a heat treatment temperature in the step of heat treatment by the suction drum is 80 to 110 ° C.   The air jet speed of the air jet device for facilitating separation of the laminated fiber web and the belt is an appropriate air speed of 15 to 25 m / s, and has improved characteristics according to claim 1. A method for producing a composite spunbond long fiber multilayer nonwoven fabric.   The high melting point polymer constituting the outermost spunbond long fiber nonwoven fabric layer is obtained by melting a polypropylene resin having a melt index (MI) at 230 ° C. of 30 to 60 g / 10 min, and a low melting point polymer. Is obtained by melting high density polyethylene (HDPE) having a melt index (MI) at 190 ° C of 25 to 35 g / 10 min and a density of 0.9515 to 0.9565. A process for producing a composite spunbond long fiber multilayer nonwoven fabric having improved properties as described in 1.   In the core-sheath-type spunbond long fiber nonwoven fabric layer, the sheath part is high-density polyethylene (HDPE), the core part is polypropylene resin, and the weight ratio of these core part to sheath part is 50 to 70 to 70 to 70- 2. The method for producing a composite spunbond long fiber multilayer nonwoven fabric having improved properties according to claim 1, wherein the composite spun fiber is produced by composite melt spinning so as to be 30.   6. A composite spunbond long fiber multilayer nonwoven fabric having improved properties, characterized in that it is produced by the method of any one of claims 1-5.   The improved basis weight of the nonwoven fabric forming the meltblown nonwoven fabric layer between the spunbond nonwoven fabric layers is 0.5 to 2.0 gsm / m <SUP> 2 </ SUP>. Composite spunbond long fiber multilayer nonwoven fabric with properties.   The composite spunbond continuous fiber having improved properties according to claim 6, wherein the composite spunbond long fiber is used in applications such as disposable diapers, side gathers of sanitary napkins, back sheets and hydrophilic processed top sheets. Multilayer nonwoven fabric.

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