A manufacturing device and a manufacturing method of a two-component spunbonded nonwoven fabric

Abstract

The present invention discloses a manufacturing device for a two-component spunbond nonwoven fabric, comprising a hot melt extrusion device, a spinning device, a monomer suction device, a side-blowing cold air device, an airflow drafting device, a swing wire laying device, a web forming device and a slitting and winding device which are sequentially connected from top to bottom, wherein: the airflow drafting device is sequentially provided with an upper air inlet, a lower air inlet and a filament diffuser from top to bottom; the present invention also discloses a manufacturing method for a two-component spunbond nonwoven fabric, and the two-component spunbond nonwoven fabric produced by the manufacturing device and the manufacturing method of the present invention is soft and fluffy.

Description

Technical Field

[0001] The invention relates to the technical field of spunbonded nonwoven fabrics, and in particular to a manufacturing device and a manufacturing method of a two-component spunbonded nonwoven fabric used for personal care and infant care. Background Art

[0002] Spunbond nonwoven fabrics are usually made of thermoplastic resin through an extruder to form spunbond long fibers from a spinneret, which are then laid on a net and locally hot-rolled and bonded using a metal hot rolling roller. Since its production process is one-step molding, the cost is low, and it is composed of spunbond long fibers without raised fiber heads, so it is often used in baby diapers, adult diapers and sanitary napkin surface layers, and can also be used in the filtration industry. However, the existing spunbond nonwoven fabrics are usually stretched by air flow during stretching, and only the coarse spunbond long fibers ejected from the spinneret are stretched under the stretching air flow and their own gravity, and the fibers in the area away from the stretching air flow are prone to coarse filaments, so that the formed spunbond long fibers have a larger fineness and uneven fineness distribution, so that the formed spunbond nonwoven fabric has poor softness.

[0003] The patent application number is CN97121375.5, and the patent name is composite long fiber nonwoven fabric and its manufacturing method. The composite spunbond method is used to spin the core-shell composite fiber of high-density polyethylene (shell square) and polypropylene (core square) on the mesh conveyor belt type fiber collection device, and stretch it on the high-speed airflow stretching device, and blow the fiber together with the gas to the mesh conveyor belt, and the gas is sucked by the high-speed airflow suction device at the bottom of the mesh conveyor belt. After the captured fiber web passes through the high-speed airflow suction stop area, it is subjected to heat ventilation treatment at a temperature of 144°C to obtain a nonwoven fabric with hot melting at the intersection between the composite long fibers. The thickness and uniformity of the formed fiber fineness are limited by airflow drafting, thereby affecting the softness of the spunbond nonwoven fabric, and through the heat ventilation treatment, the bonding and curling of the composite long fibers are completed simultaneously, so that the composite fiber has not yet completed curling, and the curling of the fiber is limited due to the surface bonding between the fibers, thereby affecting the fluffiness of the spunbond nonwoven fabric. Summary of the invention

[0004] The object of the present invention is to provide a manufacturing device and a manufacturing method for producing a fluffy and curly bicomponent spunbonded nonwoven fabric with small and uniform fiber fineness, so as to overcome the defects of the existing manufacturing device and manufacturing method.

[0005] To achieve the above object, the solution of the present invention is:

[0006] A manufacturing device for a two-component spunbond nonwoven fabric, comprising a hot melt extrusion device, a spinning device, a monomer suction device, a side-blowing cold air device, an airflow drafting device, a swing wire laying device, a web forming device and a slitting and winding device which are sequentially connected from top to bottom, wherein: the airflow drafting device is sequentially provided with an upper air inlet, a lower air inlet and a filament diffuser from top to bottom; the upper air inlet is located at the upper part of the airflow drafting device, and at least two groups are provided, and are symmetrically arranged with the coarse bicomponent spunbond long fibers or the bicomponent spunbond long fibers manufactured by the two-component spunbond nonwoven fabric manufacturing device as the center, the upper air inlet is an open slit extending along the lateral distribution direction of the coarse bicomponent spunbond long fibers or the bicomponent spunbond long fibers, and the upper air inlet airflow blown in from the upper air inlet is cold air Flow, the angle α between the upper air inlet airflow and the longitudinal machine direction at the upper air inlet is between 95° and 180°; the lower air inlet is located at the lower part of the airflow stretching device, and at least two groups are arranged, and are symmetrically arranged with the coarse bicomponent spunbond long fibers or bicomponent spunbond long fibers manufactured by the bicomponent spunbond non-woven fabric manufacturing equipment as the center, the lower air inlet is an open slit extending along the lateral distribution direction of the coarse bicomponent spunbond long fibers or the bicomponent spunbond long fibers, the lower air inlet airflow blown in from the lower air inlet is a hot air flow, and the angle β between the lower air inlet airflow and the longitudinal machine direction at the lower air inlet is between 5° and 90°; and the upper air inlet air flow rate is smaller than the lower air inlet air flow rate; the filament diffuser is arranged at the bottom of the airflow stretching device.

[0007] The angle α between the upper air inlet airflow and the longitudinal machine direction at the upper air inlet is between 110° and 150°.

[0008] The angle β between the lower air inlet airflow and the longitudinal machine direction at the lower air inlet is between 20° and 70°.

[0009] The area between the upper air inlet and the lower air inlet is a heating area.

[0010] A method for manufacturing a two-component spunbonded nonwoven fabric, characterized in that it comprises the following steps:

[0011] (1) Two thermoplastic resins with a melting point difference of ≥20°C are extruded through a hot melt extruder and enter a spinning device, where the high-temperature melt is converted into a melt stream, which is then ejected through a spinneret of the spinning device and cooled by a side-blowing cold air device to form a coarse bicomponent spunbond long fiber. During the spinning process, gas and monomer are discharged from an open hole area of ​​a monomer suction device;

[0012] (2) The formed coarse bicomponent spunbond long fibers enter an airflow drawing device, wherein the airflow drawing device comprises an upper air inlet, a lower air inlet and a filament diffuser distributed from top to bottom; the upper air inlet airflow blown in from the upper air inlet is a cold airflow, and the angle α between the upper air inlet and the longitudinal machine direction at the upper air inlet is between 95° and 180°; the lower air inlet airflow blown in from the lower air inlet is a hot airflow, and the angle β between the lower air inlet and the longitudinal machine direction at the lower air inlet is between 5° and 90°; and the upper air inlet air flow rate is smaller than the lower air inlet air flow rate; the coarse bicomponent spunbond long fibers are formed into the bicomponent spunbond long fibers under the action of the upper air inlet airflow, the lower air inlet airflow and their own gravity, and under the action of the lower air inlet hot airflow, the bicomponent spunbond long fibers are curled in a free state due to the different thermal shrinkage rates of the two resins;

[0013] (3) After the hot-air curled bicomponent spunbond long fibers are separated by a separation diffuser, they are evenly laid on a running web-forming curtain by a swinging web-laying device to form a fiber web. After the fiber web passes through the web-forming device, the low-melting-point resin on the surface of the bicomponent spunbond long fibers melts, and the fibers adhere to each other and solidify into a web. The fiber web is then slit and rolled up by a slitting and rolling device to form the bicomponent spunbond nonwoven fabric.

[0014] In the step (3), the bicomponent spunbond long fibers are bicomponent spunbond long fibers with a core-sheath structure, bicomponent spunbond long fibers with a segmented structure, or bicomponent spunbond long fibers with a parallel structure.

[0015] In the step (3), the bicomponent spunbond long fibers are interspersed with single-component spunbond long fibers whose amount is no more than 20% of the bicomponent spunbond long fibers.

[0016] In the step (2), the temperature of the lower side inlet hot air flow is ≥45°C.

[0017] In the step (2), the temperature of the lower inlet hot air flow is 60-130°C.

[0018] After adopting the above technical scheme, in the process of producing two-component spunbond non-woven fabrics using the manufacturing equipment and manufacturing method of the two-component spunbond non-woven fabric of the present invention, since the airflow stretching device is provided with an upper air inlet and a lower air inlet, the angle α between the upper air inlet cold air flow blown in from the upper air inlet and the longitudinal machine direction is between 95° and 180°. Therefore, the airflow in the airflow stretching device can be interspersed with the entire coarse two-component spunbond long fiber cooled by the side-blowing cold air device, so that all the fibers can be fully cooled, and the fibers can be prevented from being partially broken or thickened due to uneven cooling during the airflow stretching process. In addition, the airflow can form an upward resistance on the fibers, thereby forming a certain clamping effect on the fibers. The angle β between the lower side air inlet hot air flow blown in from the lower side air inlet and the longitudinal machine direction is between 5° and 90°, and the upper side air inlet flow is smaller than the lower side air inlet flow. Under the multiple effects of the upper side air inlet, the lower side air inlet and its own gravity, it is helpful for the coarse bicomponent spunbond long fibers to be drawn downward to form two groups of spunbond long fibers, or even ultra-fine denier fibers. The smaller the fiber denier, the softer the spunbond nonwoven fabric will be. At the same time, after air drafting, the bicomponent spunbond long fibers are curled by the side-blown hot air flow in the free state of the fibers, which is conducive to curling and prevents the adhesion of the fiber surface by controlling the hot air temperature. In addition, since the bicomponent spunbond long fibers have been curled before the swinging silk forms a fiber web, after being consolidated into a spunbond nonwoven fabric, there are fewer bonding points between the fibers, which increases the softness and fluffiness of the spunbond nonwoven fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the manufacturing equipment of the two-component spunbond nonwoven fabric of the present invention;

[0020] Figure 2 It is a schematic diagram of the flow direction of the upper side airflow and the lower side airflow of the two-component spunbond nonwoven fabric of the present invention;

[0021] Figure 3A The cross-sectional profile of the bicomponent spunbonded long fibers in the spunbonded nonwoven fabric of the present invention is Figure 1 ;

[0022] Figure 3B The cross-sectional profile of the bicomponent spunbonded long fibers in the spunbonded nonwoven fabric of the present invention is Figure 1 ;

[0023] Figure 3C The cross-sectional profile of the bicomponent spunbonded long fibers in the spunbonded nonwoven fabric of the present invention is Figure 1 .

[0024]

Explanation of symbols

[0025] Hot melt extrusion device1,2

[0026] Spinning device 3

[0027] Monomer suction device 4

[0028] Side blowing cold air device 5

[0029] Air drafting device 6

[0030] Upper air inlet 7, 7'

[0031] Lower air inlet 8,8'

[0032] Wire Diffuser 9

[0033] Swing wire laying device 10

[0034] Web forming device 11

[0035] Slitting and rewinding device 12

[0036] Coarse bicomponent spunbond long fiber 13

[0037] Bicomponent spunbond long fiber 14

[0038] Upper side airflow 15,15'

[0039] Lower side airflow 16,16'

[0040] The opening area 17 of the monomer suction device 4

[0041] Sheath-core structure bicomponent spunbond long fiber

[0042] Orange segment structure bicomponent spunbond long fiber b

[0043] Parallel structure bicomponent spunbond long fiber c

[0044] Low melting point resin a1, b1, c1

[0045] High melting point resin a2, b2, c2 DETAILED DESCRIPTION

[0046] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments. Example

[0047] See also Figure 1As shown, the present invention discloses a manufacturing equipment for a two-component spunbond hot air nonwoven fabric, comprising a hot melt extrusion device 1, 2, a spinning device 3, a monomer suction device 4, a side blowing cold air device 5, an airflow drafting device 6, a swing wire laying device 10, a web forming device 11 and a slitting and winding device 12 which are sequentially connected from top to bottom, wherein: the airflow drafting device 6 is sequentially provided with an upper air inlet 7, 7', a lower air inlet 8, 8' and a filament diffuser 9 from top to bottom; the upper air inlet 7, 7' is located at the upper part of the airflow drafting device 6, and at least two groups are provided, and are symmetrically arranged with the two-component spunbond long fibers 14 manufactured by the two-component spunbond nonwoven fabric manufacturing equipment as the center, the upper air inlet 7, 7' is an open slit extending along the lateral distribution direction of the two-component spunbond long fibers 14, the upper air inlet airflow 15, 15' blown in from the upper air inlet 7, 7' is a cold airflow, and the upper The angle α between the air inlet 15, 15' and the longitudinal machine direction at the upper air inlet 7, 7' is between 95° and 180°, preferably between 110° and 150°; the lower air inlet 8, 8' is located at the lower part of the air drafting device 6, and at least two groups are provided, and are symmetrically arranged with the bicomponent spunbond long fibers 14 manufactured by the bicomponent spunbond nonwoven fabric manufacturing equipment as the center, and the lower air inlet 8, 8' is arranged along the bicomponent spunbond The long fibers 14 are provided with open slits extending in the lateral distribution direction, and the lower air inlet airflow 16, 16' blown in from the lower air inlet 8, 8' is a hot air flow, and the angle β between the lower air inlet airflow 16, 16' and the longitudinal machine direction at the lower air inlet is between 5° and 90°, preferably between 20° and 70°; and the upper air inlet air flow rate is smaller than the lower air inlet air flow rate; the filament separator 9 is arranged at the bottom of the airflow stretching device 6. Example 1

[0048] like Figures 1 to 3C As shown, the present invention also discloses a method for manufacturing a bicomponent spunbonded nonwoven fabric, comprising the following steps:

[0049] (1) Two thermoplastic resins with a melting point difference of ≥20°C are extruded through hot melt extrusion devices 1 and 2 respectively and enter the spinning device 3. The thermoplastic resins may be polyethylene, polypropylene, polyester, etc. In this embodiment, polyethylene resin with a melting point of 130°C and polypropylene resin with a melting point of 165°C are used. The high-temperature melt is converted into a melt stream in the spinning device 3, and then ejected through the spinneret of the spinning device 3. After being cooled by side-blowing cold air by the side-blowing cold air device 5, a coarse bicomponent spunbond long fiber 13 is formed. During the spinning process, gas and monomer are discharged from the opening area 17 of the monomer suction device 4;

[0050] (2) The formed coarse bicomponent spunbond long fibers 13 enter the air drafting device 6, wherein the air drafting device 6 comprises an upper air inlet 7, 7', a lower air inlet 8, 8' and a filament diffuser 9 distributed from top to bottom; the upper air inlet airflow 15, 15' blown in from the upper air inlet 7, 7' is a cold airflow, and the angle α between the upper air inlet 15, 15' and the longitudinal machine direction at the upper air inlet 7, 7' is between 95° and 180° , preferably between 110° and 150°, and the lower side inlet airflow 16, 16' blown in from the lower side inlet 8, 8' is a hot airflow, and the angle β between the lower side inlet airflow 16, 16' and the longitudinal machine direction at the lower side inlet 8, 8' is between 5° and 90°, preferably between 20° and 70°, and the temperature of the lower side inlet airflow is ≥45°C, preferably between 60 and 130°C; and the upper side inlet airflow is less than the lower side inlet airflow. The upper side inlet airflow direction and the lower side inlet airflow method are as follows Figure 2 As shown, the airflow in the airflow drawing device can penetrate the entire coarse bicomponent spunbond long fibers cooled by the side-blowing cold air device, which can not only enable all fibers to be fully cooled and prevent the phenomenon of partial fiber breakage and coarse fibers due to uneven cooling during the airflow drawing process, but also the airflow can form an upward resistance on the fibers, thereby forming a certain clamping effect on the fibers; the coarse bicomponent spunbond long fibers 13 form the bicomponent spunbond long fibers 14 under the multiple effects of the upper airflow 15, 15', the lower airflow 16, 16' and their own gravity, which helps the coarse bicomponent spunbond long fibers to be drawn downward to form two-group spunbond long fibers, or even ultrafine denier fibers, and the smaller the fiber denier, the softer the formed spunbond non-woven fabric will be. Under the action of the hot air flow 16, 16' from the lower side, the two-component spunbond long fibers are curled in a free state due to the different thermal shrinkage rates of the two resins, which is not only beneficial to the curling but also can prevent the adhesion of the fiber surface by controlling the hot air temperature. At the same time, since the two-component spunbond long fibers have been curled before the swinging yarns form a fiber web, after being consolidated into a spunbond non-woven fabric, there are fewer bonding points between the fibers, which increases both the softness and fluffiness of the spunbond non-woven fabric.

[0051] (3) After the hot-air-curled bicomponent spunbond long fibers 14 are separated by the separation diffuser 9, they are evenly laid on the running web curtain by the swinging web laying device 10 to form a fiber web, wherein, Figure 3A-3CAs shown, the bicomponent spunbond long fiber 14 is a bicomponent spunbond long fiber a with a skin-core structure, the surface layer is a low-melting-point resin a1, the core layer is a high-melting-point resin a2, the bicomponent spunbond long fiber b with a segmented structure is composed of a low-melting-point resin b1 and a high-melting-point resin b2, or the bicomponent spunbond long fiber c with a parallel structure is composed of a low-melting-point resin c1 and a high-melting-point resin c2. The fiber web is passed through a web-forming device 11, the low-melting-point resin on the surface of the bicomponent spunbond long fiber 14 is melted, and the fibers are mutually adhered and consolidated into a web, wherein the web-forming device 11 is a hot air oven, a hot calender roller, or a combination of the two. Then, the bicomponent spunbond nonwoven fabric is formed after being slit and rolled by a slitting and rolling device 12. Example 2

[0052] like Figures 1 to 3C As shown, the present invention also discloses a method for manufacturing a bicomponent spunbond nonwoven fabric, which has the same steps as those in Example 1, except that the area between the upper air inlet 7, 7' and the lower air inlet 8, 8' is a heating area. After adopting the above scheme, the upper air inlet airflow 15, 15' is a cold airflow, which can fully cool the coarse bicomponent spunbond long fibers and evenly cool the fibers at various positions, and the area between the upper air inlet 7, 7' and the lower air inlet 8, 8' is a heating area. In this area, the coarse bicomponent spunbond long fibers that have been fully cooled begin to stretch under the multiple effects of the upper air inlet airflow 15, 15', the lower air inlet airflow 16, 16' and their own gravity, and this heating area further promotes fiber softening, accelerates stretching, and easily forms finer fibers. At the same time, since the two components of the bicomponent spunbond long fibers have different melting points and shrinkage rates, fiber curling begins to appear in this heating area, making the fiber curling more sufficient, thereby consolidating into a web of bicomponent spunbond non-woven fabrics, which are not compacted and are softer and fluffier. Example 3

[0053] like Figures 1 to 3C As shown, the present invention also discloses a method for manufacturing a two-component spunbond nonwoven fabric, which is the same as the steps in Example 1, except that the two-component spunbond long fibers 14 are interspersed with single-component spunbond long fibers of which the number is not more than 20%. Since the single-component spunbond long fibers are composed only of high-melting-point resins, they do not melt on the heating surface of the lower air inlet airflow 16, 16' or the web-forming device 11. The number of connection points between the two-component spunbond long fibers can be controlled by adjusting the number of single-component spunbond long fibers, thereby manufacturing spunbond nonwoven fabrics with different tensile strengths and different softness according to customer needs.

[0054] The technical content and technical features of the present invention have been disclosed as above, and the components of the present invention are not limited to the above. Those skilled in the art may still make various substitutions and modifications based on the disclosure of the present invention without departing from the creative spirit of the present invention. Therefore, the protection scope of the present invention should not be limited to the disclosure of the embodiments, but should include various substitutions and modifications that do not depart from the present invention and are covered by the claims.

Claims

1. A manufacturing device for a two-component spunbonded nonwoven fabric, comprising a hot melt extrusion device, a spinning device, a monomer suction device, a side-blowing cold air device, an airflow drafting device, a swing wire laying device, a web forming device and a slitting and winding device which are sequentially connected from top to bottom, characterized in that: The airflow drafting device is provided with an upper air inlet, a lower air inlet and a filament diffuser in sequence from top to bottom; the upper air inlet is located at the upper part of the airflow drafting device, and at least two groups are provided, and are symmetrically arranged with the two-component spunbond long fibers manufactured by the two-component spunbond non-woven fabric manufacturing equipment as the center, the upper air inlet is an open slit extending along the transverse distribution direction of the two-component spunbond long fibers, the upper air inlet airflow blown in from the upper air inlet is a cold airflow, and the angle α between the upper air inlet airflow and the longitudinal machine direction at the upper air inlet is between 95° and 180°; The lower air inlet is located at the lower part of the airflow stretching device, and at least two groups are arranged, and are symmetrically arranged with the two-component spunbond long fibers manufactured by the two-component spunbond non-woven fabric manufacturing equipment as the center. The lower air inlet is an open slit extending along the lateral distribution direction of the two-component spunbond long fibers. The lower air inlet airflow blown in from the lower air inlet is a hot airflow, and the angle β between the lower air inlet airflow and the longitudinal machine direction at the lower air inlet is between 5° and 90°; and the upper air inlet air flow rate is smaller than the lower air inlet air flow rate; the filament diffuser is arranged at the bottom of the airflow stretching device.

2. The manufacturing equipment of a two-component spunbonded nonwoven fabric according to claim 1, characterized in that: The angle α between the upper air inlet airflow and the longitudinal machine direction at the upper air inlet is between 110° and 150°.

3. The manufacturing equipment of a two-component spunbonded nonwoven fabric according to claim 1, characterized in that: The angle β between the lower air inlet airflow and the longitudinal machine direction at the lower air inlet is between 20° and 70°.

4. The manufacturing equipment of a two-component spunbonded nonwoven fabric according to claim 1, characterized in that: The area between the upper air inlet and the lower air inlet is a heating area.

5. A method for manufacturing a two-component spunbonded nonwoven fabric, characterized in that: The following steps are involved: (1) Two thermoplastic resins with a melting point difference of ≥20°C are extruded through a hot melt extruder and enter a spinning device, where the high-temperature melt is converted into a melt stream, which is then ejected through a spinneret of the spinning device and cooled by a side-blowing cold air device to form a coarse bicomponent spunbond long fiber. During the spinning process, gas and monomer are discharged from an open hole area of ​​a monomer suction device; (2) The formed coarse bicomponent spunbond long fibers enter an airflow drawing device, wherein the airflow drawing device comprises an upper air inlet, a lower air inlet and a filament diffuser distributed from top to bottom; the upper air inlet airflow blown in from the upper air inlet is a cold airflow, and the angle α between the upper air inlet and the longitudinal machine direction at the upper air inlet is between 95° and 180°; the lower air inlet airflow blown in from the lower air inlet is a hot airflow, and the angle β between the lower air inlet and the longitudinal machine direction at the lower air inlet is between 5° and 90°; and the upper air inlet air flow rate is smaller than the lower air inlet air flow rate; the coarse bicomponent spunbond long fibers are formed into the bicomponent spunbond long fibers under the action of the upper air inlet airflow, the lower air inlet airflow and their own gravity, and under the action of the lower air inlet hot airflow, the bicomponent spunbond long fibers are curled in a free state due to the different thermal shrinkage rates of the two resins; (3) After the hot-air curled bicomponent spunbond long fibers are separated by a separation diffuser, they are evenly laid on a running web-forming curtain by a swinging web-laying device to form a fiber web. After the fiber web passes through the web-forming device, the low-melting-point resin on the surface of the bicomponent spunbond long fibers melts, and the fibers adhere to each other and solidify into a web. The fiber web is then slit and rolled up by a slitting and rolling device to form the bicomponent spunbond nonwoven fabric.

6. A method for producing a bicomponent spunbonded nonwoven fabric as claimed in claim 5, characterized in that: In the step (3), the bicomponent spunbond long fibers are bicomponent spunbond long fibers with a core-sheath structure, bicomponent spunbond long fibers with a segmented structure, or bicomponent spunbond long fibers with a parallel structure.

7. A method for producing a bicomponent spunbonded nonwoven fabric as claimed in claim 5, characterized in that: In the step (3), the bicomponent spunbond long fibers are interspersed with single-component spunbond long fibers whose amount is no more than 20% of the bicomponent spunbond long fibers.

8. A method for manufacturing a bicomponent spunbonded nonwoven fabric as claimed in claim 5, characterized in that: In step (2), the temperature of the lower side inlet hot air flow is ≥45°C.

9. A method for manufacturing a bicomponent spunbonded nonwoven fabric as claimed in claim 8, characterized in that: In the step (2), the temperature of the lower inlet hot air flow is 60-130°C.

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