Regulation and control device for melt-blown fiber crystallization

Abstract

The utility model discloses a melt-blown fiber crystallization regulation and control device, which comprises a melt-blown spinneret plate and a receiving web curtain, a crystallization treatment device is arranged between the melt-blown spinneret plate and the receiving web curtain, the crystallization treatment device comprises a heating device, and a cold air device is arranged at the downstream of the heating device. The utility model has the advantage of improving the product quality.

Description

Technical Field

[0001] The utility model relates to the field of regulation devices, in particular to a device for regulating the crystallization of melt-blown fibers. Background Technique

[0002] The melt-blown method is an important non-woven fabric manufacturing process, which is widely used in the production of ultra-fine fiber non-woven fabrics, such as filter materials, medical protective materials, etc. The melt-blown method mainly extrudes the polymer after melting, and then the ultra-fine fibers are formed by stretching with a high-speed air flow. Subsequently, these fibers are cooled and deposited on the receiving wire mesh to form a non-woven fabric.

[0003] However, in the existing melt-blown process, the melt-blown fibers are rapidly cooled by the air flow during the spinning process, resulting in too fast crystallization, uneven stress formation inside the fibers, and obvious shrinkage behavior. Especially in the production of common materials such as polypropylene and polyester, rapid crystallization will lead to poor dimensional stability of the materials, easy shrinkage and deformation of the products, and even affect the physical properties of the fibers, such as tensile strength, flexibility and tear resistance. Therefore, how to effectively control the cooling rate of the fibers and regulate the crystallization rate during the melt-blown process to improve the shrinkage characteristics of the fibers has become the key to improving product quality. Content of the Utility Model

[0004] The purpose of the utility model is to provide a device for regulating the crystallization of melt-blown fibers to solve the problems put forward in the above background technique, and it has the advantage of improving product quality.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A device for regulating the crystallization of melt-blown fibers includes a melt-blown spinneret plate and a receiving wire mesh. A crystallization treatment device is arranged between the melt-blown spinneret plate and the receiving wire mesh. The crystallization treatment device includes a heating device, and a cold air device is arranged downstream of the heating device.

[0006] By adopting the above technical solution, a heating device is set and installed between the melt-blown spinneret plate and the receiving wire mesh to reheat the ejected melt-blown fibers, delay the cooling rate of the fibers, and reduce the generation of internal stress. A cold air device is set downstream of the heating device to uniformly cool the heated fibers to ensure that the fiber crystallization process is more uniform, thereby reducing the shrinkage and deformation of the fibers. Through the synergistic effect of heating and cooling, the crystallization process of the fibers can be effectively regulated, and the physical properties and dimensional stability of the products can be improved.

[0007] As a further scheme of the utility model: The heating device includes a plurality of infrared heating units, and the temperature range is 100°C - 300°C.

[0008] By adopting the above technical solution, each heating unit can separately heat the local melt-blown fibers, and the temperature control range is 100°C - 300°C. By setting different temperatures and heating intensities, the heating device can adjust the crystallization temperature of different types of polymer materials, delay the cooling rate of the fibers, and promote a more uniform crystallization process inside the fibers.

[0009] As a further solution of the present utility model: The cold air device includes a plurality of cold air nozzles, the cold air speed range is 2 - 10 m / s, and the cold air temperature range is 10°C - 25°C.

[0010] By adopting the above technical solution, the nozzle is connected to the central cold air control system through the air supply pipe (4b). The flow rate, wind speed, and temperature of the cold air can all be adjusted. The cold air speed range is 2 - 10 m / s, and the temperature range is 10°C - 25°C. When the melt-blown fibers pass through the heating device, the internal crystallization speed is effectively controlled. At this time, they enter the cold air device, and the fibers are evenly blown by the cold air and quickly cooled to room temperature. Finally, a fiber network structure is formed on the receiving wire mesh. The function of the cold air device is to ensure that the fibers can be quickly solidified at the most suitable temperature, reduce subsequent shrinkage and deformation, and release the internal stress of the fibers, improving the mechanical properties of the fibers.

[0011] Preferably, the distance between the heating device and the cold air device is set to 50 - 100 mm.

[0012] Preferably, hot air ventilation channels are provided on both sides of the melt-blowing spinneret plate, and a melt-blown fiber channel is provided in the middle of the melt-blowing spinneret plate.

[0013] Preferably, the receiving wire mesh includes a wire mesh roller and a winding roller on one side of the wire mesh roller.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] 1. By providing a heating device and a cooling device between the melt-blowing spinneret plate and the receiving wire mesh, the temperature of the melt-blown fibers is accurately regulated respectively. By precisely controlling the cooling rate and crystallization process of the fibers, the crystallization performance and shrinkage behavior of the fibers are improved, ensuring that the product has excellent dimensional stability and mechanical properties. The heating device and the cold air device work together. During the forming process of the melt-blown fibers, first, the crystallization rate of the fibers is regulated by the heating device to avoid uneven structure caused by too fast crystallization; then, it is quickly cooled by the cold air device to ensure the morphological stability of the fibers. By adjusting the working parameters of heating and cold air, it can flexibly adapt to different types of polymer melt-blowing materials, thereby improving the performance of the final product;

[0016] 2. After the melt-blown fiber is extruded from the melt-blown spinneret, it is first cooled by high-speed airflow, and the fiber surface begins to crystallize and condense. At this time, the fiber enters the range of action of the heating device. Through secondary heating, the surface temperature of the fiber rises again to close to the melting point, and the internal molecular chains are rearranged, avoiding uneven crystallization and internal stress accumulation caused by excessive cooling of the fiber;

[0017] 3. After the melt-blown fiber passes through the heating device, the internal crystallization speed is effectively controlled. At this time, it enters the cold air device, where the fiber is blown by even cold air and quickly cooled to room temperature, and finally forms a fiber mesh structure on the receiving mesh curtain. The function of the cold air device is to ensure that the fiber can be quickly solidified at the most suitable temperature, reduce subsequent shrinkage and deformation, release the internal stress of the fiber, and improve the mechanical properties of the fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the device of the utility model;

[0019] Figure 2 This is a schematic diagram of the installation position of the heating device and the cooling device.

[0020] In the figure: 1. meltblowing spinneret; 2. mesh roller; 3. heating device; 4. cooling air device. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the embodiment of the utility model,

[0023] A device for controlling crystallization of meltblown fibers, such as Figure 1 - Figure 2 As shown, it includes a melt-blown spinneret 1 and a receiving mesh curtain, a crystallization treatment device is arranged between the melt-blown spinneret 1 and the receiving mesh curtain, and the crystallization treatment device includes a heating device 3, and a cold air device 4 is arranged downstream of the heating device 3. The heating device 3 is installed below the melt-blown spinneret 1, and the distance from the ejected melt-blown fiber is about 20-50 mm. The cold air device 4 is immediately below the heating device 3, and the installation position is about 50-100 mm away from the receiving mesh curtain.

[0024] The heating device 3 includes a plurality of infrared heating units, and the temperature range is 100°C-300°C.

[0025] The cold air device 4 includes a plurality of cold air nozzles, and the cold air speed ranges from 2 to 10 m / s, and the cold air temperature ranges from 10°C to 25°C.

[0026] The distance between the heating device 3 and the cold air device 4 is set to 50 - 100 mm.

[0027] Hot air ventilation channels are arranged on both sides of the melt - blown spinneret plate 1, and a melt - blown fiber channel is arranged in the middle of the melt - blown spinneret plate 1.

[0028] The receiving wire mesh curtain includes a wire mesh roller 2 and a winding roller on one side of the wire mesh roller 2.

[0029] A metering pump and a screw are arranged above the melt - blown spinneret plate 1.

[0030] Working principle:

[0031] 1. Through the heating device 3 and the cooling device arranged between the melt - blown spinneret plate 1 and the receiving wire mesh curtain, the temperature of the melt - blown fibers is precisely regulated respectively. By precisely controlling the cooling rate and crystallization process of the fibers, the crystallization performance and shrinkage behavior of the fibers are improved, ensuring that the product has excellent dimensional stability and mechanical properties. The heating device 3 and the cold air device 4 work together. During the process of melt - blown fiber forming, first, the crystallization rate of the fibers is regulated by the heating device 3 to avoid uneven structure caused by too fast crystallization; then, the fibers are quickly cooled by the cold air device 4 to ensure the morphological stability of the fibers. By adjusting the working parameters of heating and cold air, different types of polymer melt - blown materials can be flexibly adapted, thereby improving the performance of the final product.

[0032] 2. After the melt - blown fibers are extruded from the melt - blown spinneret plate 1, they are first preliminarily cooled by a high - speed air flow, and crystallization and condensation start on the fiber surface. At this time, the fibers enter the action range of the heating device 3. Through secondary heating, the surface temperature of the fibers rises again to near the melting point, and the internal molecular chains are rearranged, avoiding uneven crystallization and internal stress accumulation caused by too fast cooling of the fibers.

[0033] 3. When the melt - blown fibers pass through the heating device 3, the internal crystallization speed is effectively controlled. At this time, they enter the cold air device 4, and the fibers are evenly blown by cold air and quickly cooled to room temperature, and finally a fiber network structure is formed on the receiving wire mesh curtain. The role of the cold air device 4 is to ensure that the fibers can be quickly solidified at the most suitable temperature, reduce subsequent shrinkage deformation, and release the internal stress of the fibers, improving the mechanical properties of the fibers.

[0034] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. A device for regulating the crystallization of melt-blown fibers, comprising a melt-blowing spinneret plate (1) and a receiving wire mesh curtain, characterized in that: A crystallization treatment device is arranged between the melt blowing spinneret plate (1) and the receiving wire mesh curtain. The crystallization treatment device includes a heating device (3), and a cold air device (4) is arranged downstream of the heating device (3).

2. The meltblown fiber crystallization regulation device according to claim 1, wherein: The heating device (3) includes a plurality of infrared heating units, and the temperature range is 100°C - 300°C.

3. The meltblown fiber crystallization regulation device according to claim 1, characterized in that: The cold air device (4) includes a plurality of cold air nozzles, the cold air speed range is 2 - 10 m / s, and the cold air temperature range is 10°C - 25°C.

4. A meltblown fiber crystallization regulation device according to claim 1, characterized in that: The distance between the heating device (3) and the cold air device (4) is set to be 50 - 100 mm.

5. The meltblown fiber crystallization regulation device according to claim 1, wherein: Hot air ventilation channels are arranged on both sides of the melt blowing spinneret plate (1), and a melt blown fiber channel is arranged in the middle of the melt blowing spinneret plate (1).

6. The meltblown fiber crystallization regulation device according to claim 1, wherein: The receiving wire mesh curtain includes a wire mesh curtain roller (2) and a winding roller on one side of the wire mesh curtain roller (2).

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