Production process of water-electret meltblown fabric

Abstract

The present invention discloses a production process for a hydro-electret meltblown fabric, comprising the following steps: meltblowing production; pure water preparation; hydro-electret, wherein the non-woven fabric is transported to the hydro-electret mechanism via a conveying mechanism. After cooling treatment, a high-pressure water pump transports the prepared pure water to a fan-shaped nozzle, which hydro-electrets the meltblown fabric, generating electric charges through friction between the pure water and the non-woven fabric fibers; and a drying process. The surface of the non-woven fabric is cooled by flowing pure water through a cooling component. The water flow diverted to the front cooling component significantly reduces the surface temperature of the non-woven fabric, while the water flow diverted to the rear cooling component slightly reduces the surface temperature of the non-woven fabric. The hot water flow and the warm water flow are mixed during the hydro-electret process, and the surface temperature of the non-woven fabric is significantly reduced before the hydro-electret process. The water flow for the hydro-electret process has a certain temperature, which avoids the large difference between hot and cold water during the hydro-electret process and the generation of a large amount of steam.

Description

Technical Field

[0001] The invention belongs to the technical field of non-woven fabric production, and in particular relates to a production process of a water-electret meltblown fabric. Background Art

[0002] Water electret, also known as hydroentanglement, involves spraying ultrapure water onto meltblown fabric at a specific angle, pressure, and flow rate. The friction between the water and the fabric fibers generates static electricity. This process produces more electrets, improving the permeability of the meltblown nonwoven fabric.

[0003] After meltblown production, the surface temperature of non-woven fabric is high, which has a large temperature difference with the water flow during spunlace. A large amount of steam will be generated during spunlace operation, which affects observation and increases the steam processing load. Summary of the Invention

[0004] The present invention addresses the problem in the prior art that a large temperature difference between the non-woven fabric and the puncturing water flow generates a large amount of steam, and proposes the following technical solutions:

[0005] The production process of water-electret meltblown cloth includes the following steps:

[0006] S1, meltblown production;

[0007] Select polypropylene particles as raw materials, mix the polypropylene particles with the electret masterbatch and then transport them to the extruder. The raw materials extruded by the extruder are ejected through the die head spinneret, and the receiving roller receives the raw materials ejected from the die head spinneret, and the receiving roller receives the raw materials to form a non-woven fabric;

[0008] S2, pure water preparation;

[0009] The water source is subjected to primary filtration and reverse osmosis agent and hydrochloric acid are added, and then the water source is subjected to secondary filtration using a reverse osmosis membrane. Alkaline industrial reagents are added to the filtered water source to complete the preparation of pure water;

[0010] S3, hydroentangled electret;

[0011] The non-woven fabric is transported to the hydroentanglement electret mechanism through a conveyor mechanism. After cooling, a high-pressure water pump delivers the prepared pure water to the fan-shaped nozzle. The fan-shaped nozzle hydroentangles the meltblown fabric, and the friction between the pure water and the non-woven fabric fibers generates an electric charge, completing the hydroentanglement electret.

[0012] S4, drying process;

[0013] The non-woven fabric after hydroentanglement is transported to the drying room through a conveying mechanism and dried by electric heating hot air shower.

[0014] The use of hydroentangled electret can produce more electrets, thereby making up for the electrodes lost during the hydroentangled electret process, making the non-woven fabric more permeable, the electrets more stable, lasting longer, with strong adsorption, and achieving good filtering effects under low resistance conditions.

[0015] As a preferred embodiment of the above technical solution, the water-jet electret mechanism includes a working box, a mixing chamber and multiple electret tubes, the mixing chamber is connected to the multiple electret tubes through a pipeline, multiple nozzles are equidistantly arranged at the bottom of the electret tube, the nozzles are connected to the external air pump through a conduit, and the working box feed front end and discharge rear end are both provided with cooling components, the cooling components include an upper water-cooling plate and a lower water-cooling plate, and multiple groups of water-cooling channels are opened inside the upper water-cooling plate and the lower water-cooling plate, one end of the water inlet pipe of the water-cooling channel is connected to the external pure water equipment through a pipeline, and one end of the water outlet pipe of the water-cooling channel is connected to the mixing chamber through a pipeline.

[0016] Use pure water to flow through the cooling component to cool the surface of the non-woven fabric. The water flow diverted to the front cooling component will greatly reduce the surface temperature of the non-woven fabric, and the water flow diverted to the rear cooling component will slightly reduce the surface temperature of the non-woven fabric. The hot water flow and the warm water flow are mixed during the hydroentanglement. The surface temperature of the non-woven fabric is greatly reduced before the hydroentanglement, and the water flow for hydroentanglement has a certain temperature to avoid a large amount of steam generated by the large difference between hot and cold during the hydroentanglement electret work. At the same time, the non-woven fabric is slightly cooled to an acceptable temperature after the hydroentanglement electret work, which is convenient for subsequent staff to take material sampling experiments on the non-woven fabric.

[0017] As a preferred embodiment of the above technical solution, the same water-cooling channel consists of a straight cooling water cavity and a return cooling water cavity, and the water inlet pipe and the water outlet pipe of the return cooling water cavity are on the same side.

[0018] Water flows into the water cooling channel of the upper water cooling plate or the lower water cooling plate from two directions, which can evenly cool the surface of the non-woven fabric passing through and avoid large temperature differences on the surface of the non-woven fabric.

[0019] As a preferred embodiment of the above technical solution, two groups of water retaining components are provided inside the working box, and the same group of water retaining components consists of two water retaining plates.

[0020] The two sets of water retaining components are able to shield the cooling components at both ends, isolating the cooling components from the working parts of the water spunlace machine without affecting the cooling work of the cooling components.

[0021] As a preferred embodiment of the above technical solution, the water retaining assembly further comprises a water squeezing drum, and both ends of the water squeezing drum are rotatably inserted into one of the water retaining plates.

[0022] The squeezing drum can rotate as the non-woven fabric moves, squeezing out part of the water inside the non-woven fabric, thereby reducing the subsequent drying time

[0023] As a preferred embodiment of the above technical solution, a drain pipe is provided at the bottom of the working box, and the drain pipe is connected to an external recovery device through a pipeline.

[0024] The water collected at the bottom of the working box can be discharged along the drain pipe to avoid the collection of higher aqueous solutions affecting the bottom of the non-woven fabric.

[0025] As a preferred embodiment of the above technical solution, a pressurized water pump and a solenoid valve are provided inside the mixing chamber, and the solenoid valve is used to discharge the water flow entering the mixing chamber.

[0026] The pressurized water pump in the mixer pressurizes the water flow to increase the water pressure intensity of the water flow. If there is too much hot water flow, the solenoid valve will open to discharge part of the hot water flow, which can prevent the mixed water flow temperature from being too high.

[0027] The beneficial effects of the present invention are:

[0028] 1. Use pure water to flow through the cooling component to cool the surface of the non-woven fabric. The water flow diverted to the front cooling component will greatly reduce the surface temperature of the non-woven fabric, and the water flow diverted to the rear cooling component will slightly reduce the surface temperature of the non-woven fabric. The hot water flow and the warm water flow are mixed during the hydroentanglement. The surface temperature of the non-woven fabric is greatly reduced before the hydroentanglement, and the water flow for hydroentanglement has a certain temperature, which avoids the large difference between hot and cold when the hydroentanglement electret works and generates a large amount of steam. At the same time, the non-woven fabric is slightly cooled to an acceptable temperature after the hydroentanglement electret work, which is convenient for subsequent staff to take material sampling experiments on the non-woven fabric;

[0029] 2. The two sets of water-blocking components can shield the cooling components at both ends, isolating the cooling components from the working parts of the hydroentanglement machine without affecting the cooling work of the cooling components. At the same time, the water-squeezing drum rotates with the movement of the non-woven fabric, squeezing out part of the water flow inside the non-woven fabric, thereby reducing the subsequent drying time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 What is shown is a schematic diagram of the overall structure of the embodiment;

[0031] Figure 2 The embodiment shown is based on Figure 1 Rear cross-sectional view of

[0032] Figure 3 Shown is a schematic structural diagram of a water cooling channel in an embodiment;

[0033] Figure 4 Shown is a diagram of the installation position of the water squeezing drum in the embodiment.

[0034] In the figure: 10, working box; 20, mixing chamber; 30, electret tube; 40, nozzle; 50, cooling assembly; 51, upper water cooling plate; 52, lower water cooling plate; 53, water inlet pipe; 54, water outlet pipe; 55, direct cooling water chamber; 56, folded back cooling water chamber; 60, water retaining assembly; 61, water retaining plate; 62, water squeezing drum; 70, drain pipe. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings.

[0036] Example

[0037] The production process of water-electret meltblown cloth includes the following steps:

[0038] S1, meltblown production;

[0039] Select polypropylene particles as raw materials, mix the polypropylene particles with the electret masterbatch and then transport them to the extruder. The raw materials extruded by the extruder are ejected through the die head spinneret, and the receiving roller receives the raw materials ejected from the die head spinneret, and the receiving roller receives the raw materials to form a non-woven fabric;

[0040] S2, pure water preparation;

[0041] The water source is subjected to primary filtration and reverse osmosis agent and hydrochloric acid are added, and then the water source is subjected to secondary filtration using a reverse osmosis membrane. Alkaline industrial reagents are added to the filtered water source to complete the preparation of pure water;

[0042] S3, hydroentangled electret;

[0043] The non-woven fabric is transported to the hydroentanglement electret mechanism through a conveying mechanism. After cooling, the high-pressure water pump delivers the prepared pure water to the fan-shaped nozzle 40. The fan-shaped nozzle 40 hydroentangles the meltblown fabric, and the friction between the pure water and the non-woven fabric fibers generates electric charges, completing the hydroentanglement electret.

[0044] S4, drying process;

[0045] The non-woven fabric after hydroentanglement is transported to the drying room through a conveying mechanism and dried by electric heating hot air shower.

[0046] The use of hydroentangled electret can produce more electrets, thereby making up for the electrodes lost during the hydroentangled electret process, making the non-woven fabric more permeable, the electrets more stable, lasting longer, with strong adsorption, and achieving good filtering effects under low resistance conditions.

[0047] Figure 1-Figure 3In the embodiment, the hydrojet electret mechanism includes a working box 10, a mixing chamber 20 and a plurality of electret tubes 30, the mixing chamber 20 is connected to the plurality of electret tubes 30 through a pipeline, a plurality of nozzles 40 are equidistantly arranged at the bottom of the electret tube 30, the nozzles 40 are connected to an external air pump through a conduit, the working box 10 is provided with a cooling assembly 50 at the front end and the rear end of the feed, the cooling assembly 50 includes an upper water-cooled plate 51 and a lower water-cooled plate 52, and a plurality of water-cooled channels are provided inside the upper water-cooled plate 51 and the lower water-cooled plate 52, one end of the water-cooled channel water inlet pipe 53 is connected to an external pure water device through a pipeline, and one end of the water-cooled channel water outlet pipe 54 is connected to the mixing chamber 20 through a pipeline.

[0048] A pressurized water pump and a solenoid valve are provided inside the mixing chamber 20 , and the solenoid valve is used to discharge the water flow entering the mixing chamber 20 .

[0049] During the hydroentanglement electret work, the non-woven fabric enters the working box 10 from the front end of the working box 10 in the a direction, and the external pure water equipment injects the pure water into the electret tube 30 through the two cooling components 50 and the mixing chamber 20. The external air pump injects the gas into the nozzle 40 through the conduit, and the nozzle 40 quickly sprays the pure water to increase the friction between the pure water and the fiber, thereby generating more static electricity. After the non-woven fabric completes the hydroentanglement electret work through multiple electret tubes 30, it leaves the hydroentanglement electret mechanism from the rear end of the working box 10. When the external pure water equipment supplies water, half of the water flows through the cooling component 50 at the front end, and half of the water flows through the cooling component 50 at the rear end. The water flows through the cooling channels inside the upper water-cooling plate 51 and the lower water-cooling plate 52, and cools the surface of the non-woven fabric passing through it, so that its temperature is greatly reduced. This part of the water flow is converted into hot water and enters the mixing chamber 20. The water flow flowing through the rear-end cooling component 50 passes through the cooling channels inside the upper water-cooling plate 51 and the lower water-cooling plate 52, and cools the surface of the non-woven fabric passing through it for a second time, so that its temperature is slightly reduced. This part of the water flow is converted into warm water and enters the mixing chamber 20. After the warm water flow and the hot water flow are mixed in the mixing chamber 20, the pressurized water pump in the mixing chamber 20 pressurizes the water flow. If there is too much hot water flow, the solenoid valve opens to discharge part of the hot water flow, which can avoid the mixed water flow temperature being too high.

[0050] The surface of the non-woven fabric is cooled by using pure water flowing through the cooling component 50. The water flow diverted to the front cooling component 50 will greatly reduce the surface temperature of the non-woven fabric, and the water flow diverted to the rear cooling component 50 will slightly reduce the surface temperature of the non-woven fabric. The hot water flow and the warm water flow are mixed during the hydroentanglement operation. The surface temperature of the non-woven fabric is greatly reduced before the hydroentanglement operation, and the water flow for hydroentanglement has a certain temperature to avoid a large amount of steam generated by a large difference in hot and cold during the hydroentanglement operation. At the same time, the non-woven fabric is slightly cooled to an acceptable temperature after the hydroentanglement operation, which is convenient for subsequent staff to conduct material sampling experiments on the non-woven fabric.

[0051] Figure 3 In the figure, the same water-cooling channel is composed of a straight cooling water chamber 55 and a return cooling water chamber 56, and the water inlet pipe 53 and the water outlet pipe 54 of the return cooling water chamber 56 are on the same side.

[0052] The water inlet pipes 53 of the direct cooling water chamber 55 and the return cooling water chamber 56 are located at both ends of the upper water-cooling plate 51 or the lower water-cooling plate 52. Water flows into the water-cooling channel of the upper water-cooling plate 51 or the lower water-cooling plate 52 from two directions, which can evenly cool the surface of the non-woven fabric passing through and avoid a large temperature difference on the surface of the non-woven fabric.

[0053] Figure 2 and Figure 4 In the embodiment, two groups of water retaining components 60 are provided inside the working box 10 , and the same group of water retaining components 60 is composed of two water retaining sheets 61 .

[0054] The water retaining assembly 60 further includes a water squeezing roller 62 , both ends of which are rotatably inserted into one of the water retaining plates 61 .

[0055] When the hydroentanglement machine is in operation, the two water baffles 61 shield the cooling components 50 at both ends of the working box 10, and the squeezing roller 62 rotates with the movement of the non-woven fabric, squeezing the non-woven fabric to squeeze out part of the water flow inside it.

[0056] The two sets of water-blocking components 60 can shield the cooling components 50 at both ends, isolating the cooling components 50 from the hydroentanglement machine working parts and will not affect the cooling work of the cooling components 50. At the same time, the water squeezing roller 62 rotates with the movement of the non-woven fabric, squeezing out part of the water flow inside the non-woven fabric, thereby reducing the subsequent drying time.

[0057] Figure 1 and Figure 2 In the embodiment, a drain pipe 70 is provided at the bottom of the working box 10, and the drain pipe 70 is connected to an external recovery device through a pipeline.

[0058] The water collected at the bottom of the working box 10 can be discharged along the drain pipe 70, and the discharged water can be recycled and reused after entering the external recycling equipment.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. The production process of water-electret meltblown cloth is characterized by: The following steps are involved: S1, meltblown production; Polypropylene particles are selected as raw materials, and the polypropylene particle raw materials and the electret masterbatch are mixed and transported to the extruder. The raw materials extruded by the extruder are ejected through the die spinneret, and the receiving roller receives the raw materials ejected from the die spinneret, and the receiving roller receives the raw materials to form a non-woven fabric; S2, pure water preparation; The water source is subjected to primary filtration and reverse osmosis agent and hydrochloric acid are added, and then the water source is subjected to secondary filtration using a reverse osmosis membrane. Alkaline industrial reagents are added to the filtered water source to complete the preparation of pure water; S3, hydroentangled electret; The non-woven fabric is transported to the hydroentanglement electret mechanism through a conveying mechanism. After cooling, a high-pressure water pump transports the prepared pure water to the fan-shaped nozzle (40). The fan-shaped nozzle (40) hydroentangles the melt-blown fabric, and the friction between the pure water and the non-woven fabric fibers generates electric charges, thereby completing the hydroentanglement electret. S4, drying process; The non-woven fabric after hydroentanglement is transported to the drying room through the conveying mechanism and dried by electric heating hot air shower; The hydrojet electret mechanism comprises a working box (10), a mixing chamber (20) and a plurality of electret tubes (30), wherein the mixing chamber (20) is connected to the plurality of electret tubes (30) via a pipeline, a plurality of nozzles (40) are equidistantly arranged at the bottom of the electret tubes (30), and the nozzles (40) are connected to an external air pump via a conduit, and a cooling assembly (50) is provided at both the feeding front end and the discharging rear end of the working box (10), and the cooling assembly (50) comprises an upper water cooling plate (51) and a lower water cooling plate (52), and a plurality of water cooling channels are provided inside the upper water cooling plate (51) and the lower water cooling plate (52), and one end of the water cooling channel water inlet pipe (53) is connected to an external pure water device via a pipeline, and one end of the water cooling channel water outlet pipe (54) is connected to the mixing chamber (20) via a pipeline; The same water-cooling channel is composed of a straight cooling water cavity (55) and a folded cooling water cavity (56), and the water inlet pipe (53) and the water outlet pipe (54) of the folded cooling water cavity (56) are located on the same side; Two groups of water retaining components (60) are provided inside the working box (10), and the same group of water retaining components (60) is composed of two water retaining sheets (61); The water retaining assembly (60) further comprises a water squeezing roller (62), and both ends of the water squeezing roller (62) are rotatably inserted into one of the water retaining plates (61).

2. The production process of the water-electret meltblown cloth according to claim 1, characterized in that: A drainage pipe (70) is provided at the bottom of the working box (10), and the drainage pipe (70) is connected to an external recovery device through a pipeline.

3. The production process of the water-electret meltblown cloth according to claim 1, characterized in that: A pressurized water pump and a solenoid valve are provided inside the mixing chamber (20), and the solenoid valve is used to discharge the water flow entering the mixing chamber (20).

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