A method for feeding a melt-blown nonwoven fabric

Abstract

The application discloses a kind of melt-blown non-woven fabric processing with feeding method, it is related to non-woven fabric technical field.The application is fed into extruder melt and is sprayed through melt-blown head, and feeding elastic filament, form non-woven fabric;Wherein, the feeding method of elastic filament includes;Before non-woven fabric melt-blown forming, based on screen pre-feeding silk;Or during non-woven fabric melt-blown forming, based on melt-blown head direct feeding silk;Or after non-woven fabric melt-blown forming, composite feeding silk, the application increases elastic filament in the fiber that melt-blown head sprays, strengthens the strength and tenacity of the non-woven fabric made, increases the application range of non-woven fabric, and the production process of the application is short, easy to process, and relatively other elastic products is more friendly to environment.

Description

Technical Field

[0001] This invention belongs to the field of nonwoven fabrics, and more specifically, relates to a method for feeding yarns in the processing of meltblown nonwoven fabrics. Background Technology

[0002] The meltblown method for preparing nonwoven fabric involves spraying molten masterbatch from a meltblown head with multiple nozzles using a high-temperature, high-speed airflow, thereby extending it into fibers. The resulting fibers accumulate on the capture surface and fuse together.

[0003] Nonwoven fabrics are widely used in many fields due to their flexibility, light weight, breathability, moisture resistance, and low price. However, traditional nonwoven fabrics, due to their lack of good elasticity, cannot meet the diverse needs of users. For example, elastic waistbands for diapers require elastic nonwoven fabrics that can conform to the human body without restricting movement. A utility model patent with authorization publication number CN213006857U discloses a highly elastic nonwoven fabric. Its technical solution includes an upper and lower surface layer composed of nonwoven fabric, and an intermediate layer composed of a thermoplastic elastomer film; the upper and lower surface layers are embossed into a wave structure and bonded to the intermediate layer.

[0004] Using the above technical solution, when the thermoplastic elastomer film undergoes elastic deformation under stretching, the nonwoven fabric on both sides can stretch out, providing more margin to maintain stability. However, the thermoplastic elastomer film has very poor air permeability. When worn against the human body, hot and humid gases cannot escape in time, causing discomfort to the user. Therefore, a nonwoven fabric with elastic filaments is provided.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a method for feeding yarn in the processing of meltblown nonwoven fabric.

[0007] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0008] A method for feeding yarn into meltblown nonwoven fabric, comprising the following steps:

[0009] The masterbatch raw material is fed into an extruder to melt and then sprayed out through a meltblown head, and then fed into elastic filaments to form nonwoven fabric;

[0010] Among them, the methods for feeding elastic filaments include:

[0011] Pre-feeding yarns based on a mesh curtain before meltblown nonwoven fabric molding;

[0012] Or, during the nonwoven fabric meltblown forming process, yarn can be directly fed from the meltblown head;

[0013] Alternatively, composite yarn feeding can be performed after the nonwoven fabric is meltblown and formed.

[0014] Optionally, the wire feeding device includes a base, which is a U-shaped plate structure. A wire mesh is driven and fitted inside the base. Four support columns are provided on the base, and an extruder is provided on the four support columns. One or two melt-blown heads are connected to the bottom of the extruder, and one or two wire feeding mechanisms are provided at the bottom of the extruder, with the wire feeding mechanisms corresponding to the melt-blown heads.

[0015] Optionally, the wire feeding mechanism includes a U-shaped frame connected to the bottom of the extruder. A fixed shaft is provided inside the U-shaped frame, and one or more wire feeding rollers are rotatably fitted on the fixed shaft. A guide roller is rotatably fitted inside the U-shaped frame. A rotating shaft is provided inside the U-shaped frame, and a servo motor for driving the rotating shaft to rotate is provided on the U-shaped frame. A spinneret corresponding to the wire feeding roller is mounted on the rotating shaft.

[0016] Optionally, the U-shaped frame has an installation notch, the fixed shaft is installed in the installation notch, and a fixed block is fixed in the installation notch, and the fixed block corresponds to the fixed shaft. The guide roller has a guide groove corresponding to the feeding roller. The guide groove is an annular groove structure coaxial with the guide roller. The spinneret includes a guide post installed on the rotating shaft. The guide post has a guide hole coaxial with it. The inner wall of the guide hole has an air guide hole coaxial with it, and the air guide hole has an annular groove structure. The inner diameter and outer diameter of the air guide hole gradually increase from one end to the first end to the second end. The first end of the air guide hole is connected to the guide hole. The guide post has an air inlet pipe. One end of the air inlet pipe is connected to an air pump, and the air inlet pipe is connected to the second end of the air guide hole. The lower part of the guide post has an installation notch corresponding to the rotating shaft, and the guide post is installed on the rotating shaft through the installation notch.

[0017] Optionally, the elastic filaments are placed on the screen manually or by a feeding mechanism in advance. The melt-blown head sprays molten masterbatch raw material onto one side of the screen and mixes it with the elastic filaments placed on the screen in advance to make a nonwoven fabric containing elastic filaments. The multiple elastic filaments are spaced at the same distance and adjacent elastic filaments are parallel to each other.

[0018] Optionally, there is a melt-blown head at the bottom of the extruder and a wire feeding mechanism at the bottom of the extruder. The wire feeding mechanism is located on one side of the width direction of the melt-blown head, and there are multiple wire feeding rollers on the fixed shaft.

[0019] Optionally, the fiber feeding mechanism is set at the edge of the meltblown head. When the meltblown head sprays the molten masterbatch raw material onto the mesh curtain, the fiber feeding mechanism simultaneously sprays the elastic filament into the fiber along the spraying direction of the meltblown head. After the fiber is mixed with the elastic filament, it falls onto the mesh curtain and cools and solidifies rapidly to produce a nonwoven fabric mixed with elastic filament.

[0020] Optionally, there is a melt-blown head at the bottom of the extruder, and two wire feeding mechanisms at the bottom of the extruder, which are located on both sides of the length of the melt-blown head, and a wire feeding roller on the fixed shaft.

[0021] Optionally, two sets of meltblown heads are provided, and a filament feeding mechanism is provided between the two sets of meltblown heads. When the meltblown head sprays the molten masterbatch raw material to one side of the mesh curtain, the filament feeding mechanism sprays out the elastic filaments to form a sandwich-like product, so that the elastic filaments are between the two sets of fiber layers, and a nonwoven fabric with elastic filaments is made.

[0022] Optionally, there are two melt-blown heads at the bottom of the extruder, and a wire feeding mechanism at the bottom of the extruder, which is located between the two melt-blown heads, and there are multiple wire feeding rollers on the fixed shaft.

[0023] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time:

[0024] This invention adds elastic filaments to the fibers ejected from the meltblown head, which enhances the strength and toughness of the resulting nonwoven fabric, increases the application range of nonwoven fabric, and the production process of this invention is short, easy to process, and more environmentally friendly than other elastic products.

[0025] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0026] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0027] Figure 1 This is a three-dimensional structural diagram of the wire feeding mechanism of the present invention;

[0028] Figure 2 This is a schematic cross-sectional view of the spinneret structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the extruder structure of the present invention;

[0030] Figure 4 This is a schematic diagram showing the positions of the meltblown head and the wire feeding mechanism of the present invention;

[0031] Figure 5 This is a three-dimensional structural schematic diagram of Embodiment 2 of the present invention;

[0032] Figure 6 This is a schematic diagram showing the positions of the meltblown head and the wire feeding mechanism in Embodiment 2 of the present invention;

[0033] Figure 7This is a three-dimensional structural schematic diagram of Embodiment 3 of the present invention;

[0034] Figure 8 This is a schematic diagram showing the positions of the meltblown head and the wire feeding mechanism in Embodiment 3 of the present invention;

[0035] Figure 9 This is a flowchart of the method of the present invention;

[0036] Figure 10 This is a schematic diagram of the nonwoven fabric structure of the present invention;

[0037] Figure 11 This is a schematic diagram of the nonwoven fabric structure of Embodiment 2 of the present invention;

[0038] Figure 12 This is a schematic diagram of the nonwoven fabric structure of Embodiment 3 of the present invention;

[0039] The attached diagram lists the components represented by each number as follows:

[0040] 1. Base; 2. Mesh curtain; 3. Support column; 4. Extruder; 5. Meltblown head; 6. Feeding mechanism; 6. U-shaped frame; 601. Fixed shaft; 602. Feeding roller; 603. Guide roller; 604. Rotating shaft; 605. Servo motor; 606. Spinneret; 607. Mounting notch; 608. Fixing block; 609. Guide groove; 610. Guide column; 611. Guide hole; 612. Air vent; 613. Air inlet pipe; 614. Mounting notch; 615. Nonwoven fabric; 7. Elastic filament; 8.

[0041] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0042] The invention will now be described in further detail with reference to the accompanying drawings.

[0043] Example 1, please refer to Figure 1-12 As shown, this embodiment provides a method for feeding yarns for processing meltblown nonwoven fabrics. The preparation method includes the following steps:

[0044] The masterbatch raw material is fed into the extruder 4 to melt and spray out through the melt-blown head 5, and then fed into the elastic filament 8 to form a non-woven fabric 7.

[0045] Among them, the feeding method of the elastic filament 8 includes;

[0046] Pre-feeding yarn based on mesh curtain 2 before meltblown molding of nonwoven fabric 7;

[0047] Or, during the meltblown forming process of nonwoven fabric 7, yarn can be directly fed based on meltblown head 5;

[0048] Alternatively, composite yarn feeding can be performed after the nonwoven fabric 7 is melt-blown.

[0049] The wire feeding device of this embodiment includes a base 1, which is a U-shaped plate structure. A mesh curtain 2 is driven and connected inside the base 1. Four support columns 3 are provided on the base 1, and an extruder 4 is provided on the four support columns 3. One or two meltblown heads 5 are connected to the bottom end of the extruder 4. One or two wire feeding mechanisms 6 are provided at the bottom end of the extruder 4, and the wire feeding mechanisms 6 correspond to the meltblown heads 5. The wire feeding mechanism 6 includes a U-shaped frame 601 connected to the bottom end of the extruder 4. A fixed shaft 602 is provided inside the U-shaped frame 601. One or more wire feeding rollers 603 are rotatably connected on the fixed shaft 602. A guide roller 604 is rotatably connected inside the U-shaped frame 601. A rotating shaft 605 is provided inside the U-shaped frame 601. A servo motor 606 for driving the rotating shaft 605 is provided on the U-shaped frame 601. A spinneret 607 corresponding to the wire feeding roller 603 is mounted on the rotating shaft 605. The spinneret 607 has a length of at least 20cm and a diameter of less than 5mm.The U-shaped frame 601 has an installation notch 608, and the fixed shaft 602 is installed in the installation notch 608, which facilitates the installation of the fixed shaft 602 on the U-shaped frame 601. This allows for quick installation of the fixed shaft 602 onto the U-shaped frame 601. A fixing block 609 is fixed within the installation notch 608, and the fixing block 609 corresponds to the fixed shaft 602, facilitating the fixing of the fixed shaft 602 onto the U-shaped frame 601 and improving the stability of the fixed shaft 602 installation. The guide roller 604 has a guide roller corresponding to the feeding roller 603. The yarn groove 610 is an annular groove structure coaxial with the guide roller 604, which facilitates the guidance of the elastic filament 8 into the guide hole 612. The spinneret 607 includes a guide post 611 mounted on the rotating shaft 605. The guide post 611 is provided with a guide hole 612 coaxial with it, which facilitates the guidance of the elastic filament 8 through the guide hole 612 and facilitates the control of the ejection direction of the elastic filament 8 by the orientation of the guide hole 612. The inner wall of the guide hole 612 is provided with an air guide hole 613 coaxial with it, and the air guide hole 613 is an annular groove. The structure features an air guide hole 613 whose inner and outer diameters gradually increase from one end to the second end. The first end of the air guide hole 613 is connected to the guide wire hole 612, facilitating the formation of an annular airflow at an acute angle to the direction of the elastic filament 8's exit. This annular airflow helps to blow the elastic filament 8 out, allowing it to cooperate with the meltblown head 5 to form a nonwoven fabric incorporating the elastic filament 8. An air inlet pipe 614 is provided on the guide wire column 611, with one end connected to an air pump, allowing the air pump to supply air to the air guide hole 613 through the air inlet pipe 614. The air inlet pipe 614 is connected to the second end of the air inlet 613. The guide post 611 has an installation notch 615 at the bottom corresponding to the rotating shaft 605. The guide post 611 is mounted on the rotating shaft 605 through the installation notch 615. The installation notch 615 increases the contact area between the guide post 611 and the rotating shaft 605, thereby improving the stability of the guide post 611 mounted on the rotating shaft 605.

[0050] Working principle: The elastic filament 8 on the feeding roller 603 passes through the guide groove 610 on the guide roller 604, and then exits through the guide hole 612 on the guide post 611. The air pump is turned on, and the air pump drives air to enter the air guide hole 613 through the air inlet pipe 614. The air guide hole 613 forms an annular wind with an acute angle to the wind direction and the exit direction of the elastic filament 8, which facilitates the elastic filament 8 to be blown out under the action of the annular wind. It is convenient to blow out the elastic filament 8 and cooperate with the meltblown head 5 to form a nonwoven fabric mixed with the elastic filament 8. The servo motor 606 is turned on to drive the rotating shaft 605 to rotate. The rotating shaft 605 drives the spinneret 607 to spin. By controlling the air pressure of the air pump, it is convenient to adjust the intensity of the spinneret 8, so that the elastic filament 8 can be incorporated into the fiber.

[0051] In this embodiment, the extruder 4 has a meltblown head 5 at its bottom end and a filament feeding mechanism 6 at its bottom end. The filament feeding mechanism 6 is located on one side of the width direction of the meltblown head 5, and there are multiple filament feeding rollers 603 on the fixed shaft 602. Before the nonwoven fabric 7 is meltblown and formed, filaments are pre-fed based on the mesh curtain 2. Specifically, the elastic filaments 8 are placed on the mesh curtain 2 manually or by means of the filament feeding mechanism 6 in advance. The meltblown head 5 sprays molten masterbatch raw material to one side of the mesh curtain 2 and mixes it with the elastic filaments pre-placed on the mesh curtain 2 to form a nonwoven fabric mixed with elastic filaments 8. The multiple elastic filaments 8 are spaced at the same distance, and two adjacent elastic filaments 8 are parallel to each other. In this process, after the elastic filaments 8 are pre-sprayed onto the mesh curtain 2 by the filament feeding mechanism 6, the position of the elastic filaments 8 still needs to be manually adjusted. Furthermore, since the initial temperature of the masterbatch material sprayed out by the meltblown head 5 is 200 degrees Celsius, it will gradually cool down to 180 degrees Celsius as the masterbatch material is sprayed out and moves towards the mesh curtain 2. After it is fully in contact with the mesh curtain 2, the temperature will drop to 60 degrees Celsius. Therefore, the adhesion with the elastic filaments 8 is not complete, which will result in some elastic filaments 8 not adhering to the sprayed masterbatch material.

[0052] Example 2, please refer to Figure 11As shown, the difference between Embodiment 2 and Embodiment 1 is that the extruder 4 has a meltblown head 5 at the bottom and two feeding mechanisms 6 at the bottom. The two feeding mechanisms 6 are located on both sides of the meltblown head 5 along its length. A feeding roller 603 is mounted on the fixed shaft 602. During the meltblown forming process of the nonwoven fabric 7, the fibers are directly fed based on the meltblown head 5. Specifically, the feeding mechanism 6 is set at the edge of the meltblown head 5. When the meltblown head 5 sprays the molten masterbatch raw material onto the mesh curtain 2, the feeding mechanism 6 simultaneously sprays the elastic filaments 8 into the fiber along the spraying direction of the meltblown head 5. After the fiber is mixed with the elastic filaments 8, it falls onto the mesh curtain 2 and cools and solidifies rapidly to produce a nonwoven fabric 7 mixed with elastic filaments 8. In this embodiment, while the masterbatch raw material is being sprayed out, the filament feeding mechanism 6 simultaneously sprays out the elastic filament 8. Compared to embodiment 1, when the temperature of the masterbatch raw material is high, the elastic filament 8 directly adheres to the masterbatch raw material, which allows the elastic filament 8 to melt well into the masterbatch raw material and has a strong adhesion to the masterbatch raw material. However, this method cannot control the shape and position of the elastic filament 8.

[0053] Example 3, please refer to Figure 12 As shown, the difference between Embodiment 2 and Embodiment 1 lies in that the extruder 4 has two meltblown heads 5 at its bottom end and a yarn feeding mechanism 6 at its bottom end, located between the two meltblown heads 5. Multiple yarn feeding rollers 603 are mounted on the fixed shaft 602. After the nonwoven fabric 7 is meltblown and formed, composite yarn feeding is performed. Specifically, two sets of meltblown heads 5 are provided, and the yarn feeding mechanism 6 is located between the two sets of meltblown heads 5. When the meltblown heads 5 spray molten masterbatch raw material towards one side of the mesh curtain 2, the yarn feeding mechanism 6 sprays out elastic filaments 8, forming a sandwich-like product. This places the elastic filaments 8 between the two fiber layers, producing a nonwoven fabric 7 incorporating elastic filaments 8. Specifically, when the two meltblown heads 5 spray out masterbatch raw material, the yarn feeding mechanism 6, located between the two meltblown heads 5, feeds the yarn. Compared to Embodiment 1, this places the elastic filaments 8 between the two fibers, achieving a composite yarn feeding effect and improving the adhesion between the elastic filaments 8 and the fibers.

[0054] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0055] This invention is not limited to the embodiments described above. Anyone should understand that structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention. Technical aspects, shapes, and structures not described in detail in this invention are all publicly known technologies.

Claims

1. A method for feeding yarn into meltblown nonwoven fabric, characterized in that, The preparation method includes the following steps: The masterbatch raw material is fed into the extruder (4) to melt and spray out through the melt-blown head (5), and then fed into the elastic filament (8) to form a non-woven fabric (7). Among them, the feeding method of elastic filament (8) includes; Fiber feeding is performed using a fiber feeding device; Pre-feeding yarn based on the mesh curtain (2) before meltblown forming of nonwoven fabric (7); Or, during the meltblown forming process of nonwoven fabric (7), the yarn can be directly fed from the meltblown head (5); Alternatively, composite yarn feeding may be performed after the nonwoven fabric (7) has been meltblown and formed; The bottom end of the extruder (4) is connected to one or two melt-blown heads (5), and the bottom end of the extruder (4) is provided with one or two wire feeding mechanisms (6), which correspond to the melt-blown heads (5); The feeding mechanism (6) is provided with a feeding roller (603) and a spinneret (607), the spinneret (607) being opposite to the feeding roller (603); The spinneret (607) includes a guide post (611) mounted on a rotating shaft (605). The guide post (611) is provided with a guide hole (612) coaxial with it. The inner wall of the guide hole (612) is provided with an air guide hole (613) coaxial with it. The air guide hole (613) has an annular groove structure. The inner diameter and outer diameter of the air guide hole (613) gradually increase from one end to the first end to the second end. The first end of the air guide hole (613) is connected to the guide hole (612). The guide post (611) is provided with an air inlet pipe (614). One end of the air inlet pipe (614) is connected to an air pump, and the air inlet pipe (614) is connected to the second end of the air guide hole (613). The feeding mechanism (6) is set at the edge of the meltblown head (5). When the meltblown head (5) sprays the molten masterbatch raw material onto the mesh curtain (2), the feeding mechanism (6) simultaneously sprays the elastic filament (8) into the fiber along the spraying direction of the meltblown head (5). After the fiber is mixed with the elastic filament (8), it falls onto the mesh curtain (2) and cools and solidifies quickly to make a nonwoven fabric mixed with elastic filament (8).

2. The method for feeding yarn into meltblown nonwoven fabric according to claim 1, characterized in that, The wire feeding device includes a base (1), which is a U-shaped plate structure. A mesh curtain (2) is driven and fitted inside the base (1). Four support columns (3) are provided on the base (1), and an extruder (4) is provided on the four support columns (3).

3. The method for feeding yarn into meltblown nonwoven fabric according to claim 2, characterized in that, The feeding mechanism (6) includes a U-shaped frame (601) connected to the bottom of the extruder (4). A fixed shaft (602) is provided inside the U-shaped frame (601). One or more feeding rollers (603) are rotatably fitted on the fixed shaft (602). A guide roller (604) is rotatably fitted inside the U-shaped frame (601). A rotating shaft (605) is provided inside the U-shaped frame (601). A servo motor (606) for driving the rotating shaft (605) to rotate is provided on the U-shaped frame (601). A spinneret (607) corresponding to the feeding roller (603) is mounted on the rotating shaft (605).

4. The method for feeding yarn into meltblown nonwoven fabric according to claim 3, characterized in that, The U-shaped frame (601) is provided with an installation notch (608), and the fixed shaft (602) is installed in the installation notch (608). A fixing block (609) is fixed in the installation notch (608), and the fixing block (609) corresponds to the fixed shaft (602). The guide roller (604) is provided with a guide groove (610) corresponding to the feed roller (603). The guide groove (610) is an annular groove structure coaxial with the guide roller (604). The lower part of the guide wire post (611) is provided with an installation notch (615) corresponding to the rotating shaft (605), and the guide wire post (611) is installed on the rotating shaft (605) through the installation notch (615).

5. The method for feeding yarn into meltblown nonwoven fabric according to claim 4, characterized in that, The elastic filaments (8) are placed on the mesh curtain (2) manually or by the feeding mechanism (6) in advance. The melt-blown head (5) sprays the molten masterbatch raw material to one side of the mesh curtain (2) and mixes it with the elastic filaments placed on the mesh curtain (2) in advance to make a non-woven fabric containing elastic filaments (8). The spacing between multiple elastic filaments (8) is the same, and two adjacent elastic filaments (8) are parallel to each other.

6. The method for feeding yarn into meltblown nonwoven fabric according to claim 5, characterized in that, The extruder (4) has a melt-blown head (5) at the bottom and a wire feeding mechanism (6) at the bottom. The wire feeding mechanism (6) is located on one side of the width direction of the melt-blown head (5), and there are multiple wire feeding rollers (603) on the fixed shaft (602).

7. The method for feeding yarn into meltblown nonwoven fabric according to claim 6, characterized in that, The extruder (4) has a melt-blown head (5) at the bottom and two wire feeding mechanisms (6) at the bottom. The two wire feeding mechanisms (6) are located on both sides of the length direction of the melt-blown head (5). There is a wire feeding roller (603) on the fixed shaft (602).

8. The method for feeding yarn into meltblown nonwoven fabric according to claim 4, characterized in that, Two sets of meltblown heads (5) are provided, and a filament feeding mechanism (6) is provided between the two sets of meltblown heads (5). When the meltblown head (5) sprays the molten masterbatch raw material to one side of the mesh curtain (2), the filament feeding mechanism (6) sprays out the elastic filament (8) to form a sandwich-like product, so that the elastic filament (8) is between the two sets of fiber layers, and a nonwoven fabric (7) with elastic filament (8) is made.

9. A method for feeding yarn into meltblown nonwoven fabric according to claim 8, characterized in that, The extruder (4) has two melt-blown heads (5) at the bottom and a wire feeding mechanism (6) at the bottom. The wire feeding mechanism (6) is located between the two melt-blown heads (5) and there are multiple wire feeding rollers (603) on the fixed shaft (602).

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