A manufacturing process for high-precision polypropylene spunbond hot-rolled nonwoven fabric

Abstract

The present invention provides a high-precision polypropylene spunbond hot-rolled non-woven fabric manufacturing process for use in the field of non-woven fabrics. The process adds a carbon interlayer during the spinning and web-forming operation, and performs polypropylene melt spinning and web-forming operations on both sides of the carbon interlayer, so that a double-layer non-woven fabric with a carbon interlayer is finally obtained. Compared with the existing technology, the carbon interlayer can be used as an inner lining, thereby greatly improving its strength. When used as a filter layer, at the same medium passing speed, it is subjected to smaller deformation, so that when used, the medium passing speed can be appropriately continued to be increased, further improving the filtration efficiency. In addition, the carbon interlayer contains nano-activated carbon. During manufacturing, no other operations are required. As the original hot rolling step is carried out, the nano-activated carbon can be fully released, thereby greatly improving the filtration accuracy of the manufactured cloth.

Description

Technical Field

[0001] The present application relates to the field of nonwoven fabrics, and in particular to a manufacturing process for high-precision polypropylene spunbond hot-rolled nonwoven fabrics. Background Art

[0002] Nonwoven fabric is a type of fabric that does not require spinning or weaving. It is made by aligning or randomly arranging short textile fibers or filaments to form a fiber web structure, which is then reinforced by mechanical, thermal bonding or chemical methods. For example, nonwoven fabric is a type of nonwoven fabric.

[0003] Non-woven fabrics are often used in the field of filtration. During the filtration process, in order to ensure filtration efficiency, the speed at which the medium passes through the non-woven fabric is generally increased. However, the strength of non-woven fabrics in the existing technology is limited. At a faster passing speed, the impact force is inevitably greater, causing the non-woven fabric filter layer to be easily deformed, resulting in a shorter service life. In addition, its filtration performance is also limited, making it difficult to meet the needs of high-efficiency and high-precision filtration. Summary of the Invention

[0004] The purpose of this application is to improve the strength and filtering effect of nonwoven fabrics when used for filtration, effectively ensure their service life, and provide a high-precision polypropylene spunbond hot-rolled nonwoven fabric manufacturing process compared to the prior art, including the following steps:

[0005] S1. First, the prepared polypropylene raw material slices are put into a screw machine for high-temperature melting treatment to obtain a molten liquid;

[0006] S2, passing the molten liquid into a melt filter for filtering, and then putting it into a spinning box for spinning treatment;

[0007] S3, drawing and shaping the spun filament bundle to obtain fibers, and then passing the fibers through a cooling fan so that the fibers are evenly distributed on a web conveyor belt with a carbon interlayer to obtain a crude nonwoven fabric with a double-sided web structure;

[0008] S4. The double-sided mesh structure is subjected to hot rolling treatment to solidify and shape the double-sided mesh structure and release nano-activated carbon at the same time. The temperature during the hot rolling treatment is 135-145°C to obtain a primary non-woven fabric. Finally, post-finishing and drying treatment are performed to obtain a non-woven fabric having two non-woven fabric layers and a carbon interlayer. The non-woven fabric has a high-precision filtering effect.

[0009] By adding a carbon interlayer during the spinning and weaving operation, and coordinating the polypropylene melt spinning and weaving operation on both sides of the carbon interlayer, a double-layer non-woven fabric with a carbon interlayer is finally obtained. Compared with the existing technology, the carbon interlayer can be used as an inner lining, thereby greatly improving its strength. When used as a filter layer, at the same medium passing speed, it is subjected to smaller deformation, so that when in use, the medium passing speed can be appropriately continued to increase, further improving the filtration efficiency. In addition, the carbon interlayer contains nano-activated carbon. During manufacturing, no other operations are required. As the original hot rolling step proceeds, the nano-activated carbon can be fully released, thereby greatly improving the filtration accuracy of the manufactured cloth.

[0010] Furthermore, the specific operations for obtaining the double-sided mesh structure in step S3 are:

[0011] S31, first laying the carbon-containing interlayer on the web-forming conveyor belt, and then using a cooling fan to evenly distribute the fibers on the carbon-containing interlayer on the surface of the web-forming conveyor belt, to obtain a carbon-containing interlayer with a single-sided loose web structure;

[0012] S32, performing a roller pressing process on the single-sided loose mesh structure to preliminarily pre-shape the single-sided loose mesh structure on the carbon interlayer to obtain a single-sided mesh;

[0013] S33, turning the single-sided web over, and then repeating steps S31-S32, so that both sides of the carbon-bearing interlayer are attached with non-woven web structures.

[0014] Furthermore, in step S4, when the hot-rolled non-woven fabric is dried, the non-woven fabric is shaken or vibrated simultaneously. On the one hand, the shaking or vibration can accelerate the drying efficiency of the non-woven fabric. On the other hand, the nano-activated carbon particles released after hot rolling can be fully and evenly dispersed, so that the filtration accuracy of the non-woven fabric is higher when it is put into use later.

[0015] Furthermore, the carbon-containing interlayer includes multiple adsorption-aid units, and two adjacent adsorption-aid units are perpendicular to each other. The adsorption-aid units include a carbon aggregation ball and two pre-dispersion arms respectively fixedly connected to the outer ends of the carbon aggregation ball. The pre-dispersion arms in the two adjacent adsorption-aid units are connected to the carbon aggregation ball. The carbon aggregation ball and the pre-dispersion arms are both made of carbon fiber material, so that both have the effects of flexibility, high strength, high temperature resistance and corrosion resistance, thereby making the entire carbon-containing interlayer flexible and strong at the same time. The strength of the non-woven fabric can be greatly improved without changing its flexibility. When used as a filter material, it can carry a faster medium passing speed.

[0016] Furthermore, the pre-dispersion arm is connected to the carbon aggregation ball on the same adsorption unit, but not to the carbon aggregation ball on the adjacent adsorption unit, so that the nano-activated carbon on the adsorption unit is relatively evenly distributed on the entire carbon interlayer, and it is difficult to concentrate on a certain part.

[0017] Furthermore, a carbon release sheet is attached to the connecting port between the pre-dispersion arm and the carbon aggregation ball on the same adsorption auxiliary unit. The carbon release sheet is located on the inner wall of the carbon aggregation ball, which is filled with nano-activated carbon. The carbon release sheet is used to seal the nano-activated carbon particles so that they are not easily released at any time on the adsorption auxiliary unit, thereby effectively preventing some nano-activated carbon from escaping from the pre-dispersion arm.

[0018] Furthermore, the carbon aggregation ball is a sealed spherical structure, and the pre-dispersion arm is a porous tubular structure. Before hot rolling, the nano-activated carbon is only distributed in the carbon aggregation ball. During hot rolling, due to the influence of temperature, the carbon release sheet shrinks, so that the mouth where the carbon aggregation ball and the pre-dispersion arm communicate is opened. At this time, the activated carbon particles are released and can enter the pre-dispersion arm, and the axes of the two pre-dispersion arms on the same adsorption aid unit are located on the same straight line.

[0019] Furthermore, the carbon release sheet includes a covering layer and a plurality of heat shrinkable strips fixedly embedded in the covering layer. The covering layer is a high-temperature resistant flexible sealing structure. The heat shrinkable strips are made of a one-way memory alloy material, and the critical temperature of the heat shrinkable strips is 120°C. After being shrinked by high temperature, the carbon release sheet will not recover its deformation when it is exposed to high temperature again, effectively ensuring that the carbon release sheet is not prone to causing re-blocking between the carbon aggregation ball and the pre-dispersion arm during subsequent use of the manufactured cloth, effectively ensuring the auxiliary interception adsorption of the nano-activated carbon in the entire adsorption aid unit.

[0020] Optionally, the specific operation of obtaining the double-sided mesh structure in step S3 is:

[0021] S31, using a cooling fan to evenly distribute the fibers on the web conveyor belt to form a loose web structure, and after the temperature is slightly lowered, laying a layer of nano-activated carbon particles on the surface of the loose web structure, and then performing a roller pressing operation to relatively stably press the nano-activated carbon particles onto the web structure;

[0022] S32. After the rolling operation, another layer of nano-activated carbon particles is laid on the nano-activated carbon particle layer, and then the cooling fan is used to pull the nano-activated carbon particles to form a loose mesh structure on the surface. The nano-activated carbon particles are then rolled to obtain a rough non-woven fabric with a double-sided mesh structure and a nano-activated carbon interlayer.

[0023] Furthermore, the laying thickness of each layer of nano activated carbon particles does not exceed 1 mm.

[0024] Compared with the existing technology, the advantages of this application are:

[0025] (1) By adding a carbon interlayer during the spinning process, and performing polypropylene melt spinning on both sides of the carbon interlayer, a double-layer non-woven fabric with a carbon interlayer is finally obtained. Compared with the existing technology, the carbon interlayer can be used as an inner lining, thereby greatly improving its strength. When used as a filter layer, at the same medium passing speed, it is less deformed, so that when used, the medium passing speed can be appropriately increased to further improve the filtration efficiency. In addition, the carbon interlayer contains nano-activated carbon. During manufacturing, no other operations are required. As the original hot rolling step proceeds, the nano-activated carbon can be fully released, thereby greatly improving the filtration accuracy of the manufactured cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is the main flow chart of this application;

[0027] Figure 2 This is a schematic diagram of an explosion of the nonwoven product of this application;

[0028] Figure 3 Schematic diagram of the carbon interlayer of this application;

[0029] Figure 4 This is a partially enlarged schematic diagram of the carbon interlayer of this application;

[0030] Figure 5 This is a schematic diagram of the side of the adsorption auxiliary unit of this application;

[0031] Figure 6 This is a schematic diagram of the shrinkage of the carbon release sheet of the present application under high temperature during hot rolling;

[0032] Figure 7 This is an exploded view of the nonwoven product in Example 2 of the present application;

[0033] Figure 8 This is the main flow chart of Example 2 of this application.

[0034] Description of the numbers in the figure:

[0035] 11 non-woven layer, 12 carbon interlayer, 121 carbon aggregation ball, 122 pre-dispersion arm, 31 cover layer, 32 heat shrink strip. DETAILED DESCRIPTION

[0036] The embodiments will be combined with the drawings in the specification to clearly and completely describe the technical solution of this application. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of this application.

[0037] Example 1:

[0038] See also Figure 1 The present invention provides a high-precision polypropylene spunbond hot-rolled nonwoven fabric manufacturing process, comprising the following steps:

[0039] S1. First, the prepared polypropylene raw material slices are put into a screw machine for high-temperature melting treatment to obtain a molten liquid;

[0040] S2, passing the molten liquid into a melt filter for filtering, and then putting it into a spinning box for spinning treatment;

[0041] S3, drawing and shaping the spun filament bundle to obtain fibers, and then passing the fibers through a cooling fan so that the fibers are evenly distributed on a web conveyor belt with a carbon interlayer 12 to obtain a crude nonwoven fabric with a double-sided web structure;

[0042] The specific operations for obtaining the double-sided mesh structure in step S3 are:

[0043] S31, first laying the carbon-containing interlayer 12 on the web-forming conveyor belt, and then using a cooling fan to evenly distribute the fibers on the carbon-containing interlayer 12 on the surface of the web-forming conveyor belt, to obtain a carbon-containing interlayer with a single-sided loose web structure;

[0044] S32, performing a roller pressing process on the single-sided loose mesh structure to preliminarily pre-shape the single-sided loose mesh structure on the carbon interlayer to obtain a single-sided mesh;

[0045] S33, turning the single-sided mesh over, and then repeating steps S31-S32, so that both sides of the carbon interlayer are attached with a non-woven mesh structure;

[0046] S4, hot rolling treatment is performed on the double-sided mesh structure to solidify the double-sided mesh structure and release nano-activated carbon at the same time. The temperature during hot rolling treatment is 135-145 ° C to obtain a non-woven fabric primary product, and finally post-finishing and drying treatment are performed to obtain the following Figure 2 The nonwoven fabric shown has two nonwoven fabric layers 11 and a nonwoven fabric with a carbon interlayer 12, which has a high-precision filtering effect.

[0047] In step S4, when the hot-rolled non-woven fabric is dried, the non-woven fabric is shaken or vibrated simultaneously. On the one hand, the shaking or vibration can speed up the drying efficiency of the non-woven fabric. On the other hand, the nano-activated carbon particles released after hot rolling can be fully and evenly dispersed, so that the filtration accuracy of the non-woven fabric is higher when it is put into use later.

[0048] See also Figure 3The carbon-containing interlayer 12 includes multiple adsorption-assisting units, and two adjacent adsorption-assisting units are perpendicular to each other. The adsorption-assisting units include a carbon aggregation ball 121 and two pre-dispersion arms 122 respectively fixedly connected to the outer ends of the carbon aggregation ball 121. The pre-dispersion arms 122 in the two adjacent adsorption-assisting units are connected to the carbon aggregation ball 121. The carbon aggregation ball 121 and the pre-dispersion arms 122 are both made of carbon fiber material, so that both have the effects of flexibility, high strength, high temperature resistance and corrosion resistance, so that the entire carbon-containing interlayer 12 has high strength while being flexible. It can greatly improve the strength of the non-woven fabric without changing its flexibility. When used as a filter material, it can carry a faster medium passing speed.

[0049] The pre-dispersion arm 122 is connected to the carbon aggregation ball 121 on the same adsorption auxiliary unit, but is not connected to the carbon aggregation ball 121 on the adjacent adsorption auxiliary unit, so that the nano-activated carbon on the adsorption auxiliary unit is relatively evenly distributed on the entire carbon interlayer 12, and it is difficult to concentrate on a certain part.

[0050] See also Figure 4-5 The connecting mouth between the pre-dispersion arm 122 and the carbon gathering ball 121 on the same auxiliary adsorption unit is attached with a carbon release sheet, which is located on the inner wall of the carbon gathering ball 121. The carbon gathering ball 121 is filled with nano-activated carbon. The carbon release sheet is used to seal the nano-activated carbon particles so that they are not easily released at any time on the auxiliary adsorption unit, thereby effectively preventing some nano-activated carbon from escaping from the pre-dispersion arm 122; the carbon gathering ball 121 is a sealed spherical structure, and the pre-dispersion arm 122 is a porous tubular structure. Before hot rolling, the nano-activated carbon is only distributed in the carbon gathering ball 121. During hot rolling, due to the influence of temperature, the carbon release sheet shrinks, so that the mouth where the carbon gathering ball 121 and the pre-dispersion arm 122 are connected is opened. At this time, the activated carbon particles are released and can enter the pre-dispersion arm 122, and the axes of the two pre-dispersion arms 122 on the same auxiliary adsorption unit are located on the same straight line.

[0051] like Figure 5 The carbon release sheet includes a covering layer 31 and a plurality of heat shrinkable strips 32 fixedly embedded in the covering layer 31. The covering layer 31 is a high-temperature resistant flexible sealing structure. The heat shrinkable strips 32 are made of a one-way memory alloy material, and the critical temperature of the heat shrinkable strips 32 is 120°C. Figure 6 After being wrinkled by high temperature, the carbon release sheet will not recover its deformation when it is subjected to high temperature again, effectively ensuring that the carbon release sheet is not likely to cause re-blocking between the carbon aggregation ball 121 and the pre-dispersion arm 122 during the subsequent use of the manufactured cloth, effectively ensuring the auxiliary interception adsorption of the nano-activated carbon in the entire auxiliary adsorption unit.

[0052] By adding a carbon interlayer during the spinning and weaving operation, and coordinating the polypropylene melt spinning and weaving operation on both sides of the carbon interlayer, a double-layer non-woven fabric with a carbon interlayer 12 is finally obtained. Compared with the existing technology, the carbon interlayer 12 can be used as an inner lining, thereby greatly improving its strength. When used as a filter layer, at the same medium passing speed, it is subjected to smaller deformation, so that when in use, the medium passing speed can be appropriately continued to be increased, further improving the filtration efficiency. In addition, the carbon interlayer contains nano-activated carbon. During manufacturing, no other operations are required. As the original hot rolling step proceeds, the nano-activated carbon can be fully released, thereby greatly improving the filtration accuracy of the manufactured cloth.

[0053] Example 2:

[0054] See also Figure 8 A high-precision polypropylene spunbond hot-rolled nonwoven fabric manufacturing process comprises the following steps:

[0055] S1. First, the prepared polypropylene raw material slices are put into a screw machine for high-temperature melting treatment to obtain a molten liquid;

[0056] S2, passing the molten liquid into a melt filter for filtering, and then putting it into a spinning box for spinning treatment;

[0057] S3, drawing and shaping the spun filament bundle to obtain fibers, and then passing the fibers through a cooling fan so that the fibers are evenly distributed on a web conveyor belt with a carbon interlayer 12 to obtain a crude nonwoven fabric with a double-sided web structure;

[0058] The specific operations for obtaining the double-sided mesh structure in step S3 are:

[0059] S31, using a cooling fan to evenly distribute the fibers on the web conveyor belt to form a loose web structure, and after the temperature is slightly lowered, laying a layer of nano-activated carbon particles on the surface of the loose web structure, and then performing a roller pressing operation to relatively stably press the nano-activated carbon particles onto the web structure;

[0060] S32, after the rolling operation, further laying a layer of nano activated carbon particles on the nano activated carbon particle layer, and then again pulling the cooling fan to form a loose mesh structure on the surface, and then rolling to preliminarily obtain a nonwoven fabric crude product with a double-sided mesh structure with a nano activated carbon interlayer;

[0061] The laying thickness of each layer of nano activated carbon particles shall not exceed 1mm;

[0062] S4, hot rolling treatment is performed on the double-sided mesh structure to consolidate and shape the double-sided mesh structure, the temperature during hot rolling treatment is 135-145 ° C, and the non-woven fabric is obtained as a primary product, and finally post-finishing and drying treatment are performed to obtain the following Figure 7 The nonwoven fabric shown has two nonwoven fabric layers, a nonwoven layer 11 and an activated carbon layer, and has a high-precision filtering effect.

[0063] The difference between this embodiment and Example 1 is that the setting method of the activated carbon layer in the center of the non-woven fabric is consistent with Example 1 in other parts. In addition, the setting of the activated carbon layer in this embodiment does not require an auxiliary structure, and the cost is relatively lower than that of Example 1. However, without the assistance of the carbon interlayer 12, the strength of the finished non-woven fabric of this embodiment is not as high as that of the finished product of Example 1. During the specific implementation, those skilled in the art can select a suitable implementation method according to actual needs.

[0064] The above is only the best implementation method adopted by this application in combination with current actual needs, but the scope of protection of this application is not limited to this.

Claims

1. A process for manufacturing high-precision polypropylene spunbond hot-rolled nonwoven fabric, characterized in that: The following steps are involved: S1. First, the prepared polypropylene raw material slices are put into a screw machine for high-temperature melting treatment to obtain a molten liquid; S2, passing the molten liquid into a melt filter for filtering, and then putting it into a spinning box for spinning treatment; S3, drawing and shaping the spun filament bundle to obtain fibers, and then passing the fibers through a cooling fan so that the fibers are evenly distributed on a web conveyor belt with a carbon interlayer (12), thereby obtaining a crude nonwoven fabric with a double-sided web structure; S4, hot rolling the double-sided mesh structure to solidify and shape the double-sided mesh structure, while releasing nano-activated carbon, the temperature during hot rolling is 135-145° C., to obtain a non-woven fabric product, and finally post-finishing and drying treatment to obtain a non-woven fabric having two non-woven fabric layers (11) and a carbon interlayer (12), the non-woven fabric having a high-precision filtering effect; The specific operations for obtaining the double-sided mesh structure in step S3 are: S31, first laying the carbon-containing interlayer (12) on the web-forming conveyor belt, and then using a cooling fan to evenly distribute the fibers on the carbon-containing interlayer (12) on the surface of the web-forming conveyor belt, to obtain a carbon-containing interlayer with a single-sided loose web structure; S32, performing a roller pressing process on the single-sided loose mesh structure to preliminarily pre-shape the single-sided loose mesh structure on the carbon interlayer to obtain a single-sided mesh; S33, turning the single-sided mesh over, and then repeating steps S31-S32, so that both sides of the carbon interlayer are attached with a non-woven mesh structure; The carbon interlayer (12) includes a plurality of adsorption-assisting units, and two adjacent adsorption-assisting units are perpendicular to each other, the adsorption-assisting units include a carbon aggregation ball (121) and two pre-dispersion arms (122) respectively fixedly connected to the outer ends of the carbon aggregation ball (121), the pre-dispersion arms (122) in the two adjacent adsorption-assisting units are connected to the carbon aggregation ball (121), the carbon aggregation ball (121) and the pre-dispersion arms (122) are both made of carbon fiber materials, and the pre-dispersion arms (122) are connected to the carbon aggregation ball (121) on the same adsorption-assisting unit. A carbon release sheet is attached to the communication port of the carbon aggregation ball (121), and the carbon release sheet is located on the inner wall of the carbon aggregation ball (121). The carbon aggregation ball (121) is filled with nano-activated carbon. The carbon release sheet includes a covering layer (31) and a plurality of heat shrinkable strips (32) respectively fixedly embedded in the covering layer (31). The covering layer (31) is a high-temperature resistant flexible sealing structure. The heat shrinkable strips (32) are made of a one-way memory alloy material, and the critical temperature of the heat shrinkable strips (32) is 120°C.

2. The process for manufacturing high-precision polypropylene spunbond hot-rolled nonwoven fabric according to claim 1, characterized in that: In the step S4, while the hot-rolled nonwoven fabric product is being dried, the nonwoven fabric product is simultaneously shaken or vibrated.

3. The process for manufacturing high-precision polypropylene spunbond hot-rolled nonwoven fabric according to claim 1, characterized in that: The pre-dispersion arm (122) is in communication with the carbon aggregation ball (121) on the same adsorption-assisting unit, and the pre-dispersion arm (122) is not in communication with the carbon aggregation ball (121) on the adjacent adsorption-assisting unit.

4. The process for manufacturing high-precision polypropylene spunbond hot-rolled nonwoven fabric according to claim 1, characterized in that: The carbon aggregation ball (121) is a sealed spherical structure, the pre-dispersion arm (122) is a porous tubular structure, and the axes of the two pre-dispersion arms (122) on the same adsorption assist unit are located on the same straight line.

5. The process for manufacturing high-precision polypropylene spunbond hot-rolled nonwoven fabric according to claim 1, characterized in that: The specific operations for obtaining the double-sided mesh structure in step S3 are: S31, using a cooling fan to evenly distribute the fibers on the web conveyor belt to form a loose web structure, and after the temperature is slightly lowered, laying a layer of nano-activated carbon particles on the surface of the loose web structure, and then performing a roller pressing operation to relatively stably press the nano-activated carbon particles onto the web structure; S32. After the rolling operation, another layer of nano-activated carbon particles is laid on the nano-activated carbon particle layer, and then the cooling fan is used to pull the nano-activated carbon particles to form a loose mesh structure on the surface. The nano-activated carbon particles are then rolled to obtain a rough non-woven fabric with a double-sided mesh structure and a nano-activated carbon interlayer.

6. A process for manufacturing high-precision polypropylene spunbond hot-rolled nonwoven fabric according to claim 5, characterized in that: The laying thickness of each layer of the nano activated carbon particles does not exceed 1 mm.

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