Preparation method of flash spinning spunlace non-woven fabric

Abstract

The invention belongs to the technical field of flash evaporation production, and particularly relates to a preparation method of flash spinning spunlace non-woven fabric. The invention provides a preparation method of flash-spun spunlace non-woven fabric, aiming at the problem that the porous characteristic of a polyethylene flash-spun non-woven material is damaged by an embossing roller pressing, ironing and bonding method in the prior art, and the preparation method comprises the following steps of: 1, carrying out flash evaporation to obtain a polyethylene flash-spun non-woven material; secondly, one end of the non-woven material prepared in the first step is pressed on a feeding roller shaft, the other end of the non-woven material is flattened through a flat net assembly, spunlace treatment is conducted through a spunlace assembly, finally, the non-woven material is pressed on a receiving roller shaft, and the bottom of the flat net assembly is located in a liquid storage box and soaked in spunlace conditioning liquid. The invention provides the polyethylene flash evaporation non-woven material which is compounded by utilizing spunlace treatment and has a layered structure, so that the polyethylene flash evaporation non-woven material has relatively large porosity while being not layered, and a finished product keeps the characteristics of softness, air permeability and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of flash spinning production, and particularly relates to a method for preparing flash spun hydroentangled nonwoven fabric. Background Art

[0002] Flash spinning refers to a spinning method in which a polymer solution is extruded under high pressure above the boiling point of its solvent, and the solvent flashes to cause the polymer to cool and solidify to form fibers. Also known as solution flash spinning. It requires that the polymer and the solvent do not decompose above the boiling point of the solvent, and the solvent is easy to evaporate. When the extruded solution stream suddenly reduces pressure, the solvent flashes, causing the polymer to solidify into fibers. The most prominent feature of flash spinning technology is phase separation. For example, during the dissolution process, the polymer and the solvent are stirred under high temperature and high pressure to form a homogeneous solution; in the low-pressure chamber, the pressure is slightly reduced to cause a certain degree of phase separation of the solution, forming a two-phase solution, one phase being a polymer-rich phase and the other phase being a solvent-rich phase; finally, when the solution enters the normal temperature and normal pressure air through the spinneret holes, the solvent is converted into steam and rapidly phase-separates from the polymer.

[0003] The polyethylene flash spun nonwoven material prepared by the flash spinning method has very fine fibers, with an average fiber fineness of less than 2μm, and the polyethylene fibers are very soft and have a three-dimensional network structure. However, the process of laying the web by the flash spinning method is to lay the web layer by layer, resulting in an obvious layered structure in the product. Once the post-treatment process is not well handled, delamination is likely to occur. In the prior art, the method of hot pressing and bonding with a patterned roller is usually used to prevent delamination of the product. However, this hot pressing and bonding process with a patterned roller destroys the porosity characteristics of the polyethylene flash spun nonwoven material, making the finished products generally have problems such as hardness, strong plastic feeling, and poor air permeability. Summary of the Invention

[0004] The purpose of the present invention is to provide a flash spun thin sheet with high heat shielding for the above problems.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: A method for preparing flash spun hydroentangled nonwoven fabric, comprising the following steps: Step 1: Flash spin to obtain a polyethylene flash spun nonwoven material; Step 2: Press one end of the nonwoven material obtained in Step 1 on a feeding roller shaft, and after the other end is leveled by a flat screen assembly and then subjected to hydroentangling treatment through a hydroentangling assembly, finally press it on a receiving roller shaft. The bottom of the flat screen assembly is located in a liquid storage tank and is immersed in a hydroentangling conditioning liquid.

[0006] In the above method for preparing flash spun hydroentangled nonwoven fabric, the hydroentangling conditioning liquid comprises pentaerythritol and polyether silicone in a mass ratio of 1:1.

[0007] In the above - mentioned method for preparing spunlace non - woven fabric, the spunlace assembly includes a spunlace roller shaft and a spunlace head located on one side of the spunlace roller shaft, and the non - woven material is pressed on the surface of the spunlace roller shaft.

[0008] In the above - mentioned method for preparing spunlace non - woven fabric, a negative - pressure structure capable of generating suction force on the surface non - woven material is provided inside the spunlace roller shaft, and the negative - pressure structure includes a vacuum pump.

[0009] In the above - mentioned method for preparing spunlace non - woven fabric, the spunlace roller shaft includes a front roller shaft close to the feeding roller shaft and a rear roller shaft close to the receiving roller shaft. A first spunlace head is provided on one side of the front roller shaft, and a second spunlace head is provided on one side of the rear roller shaft. The spunlace pressure of the second spunlace head is greater than that of the first spunlace head.

[0010] In the above - mentioned method for preparing spunlace non - woven fabric, the spunlace pressure of the first spunlace head is 20 - 120 bar.

[0011] In the above - mentioned method for preparing spunlace non - woven fabric, the spunlace pressure of the first spunlace head is 40 - 100 bar.

[0012] In the above - mentioned method for preparing spunlace non - woven fabric, the spunlace pressure of the second spunlace head is 50 - 150 bar.

[0013] In the above - mentioned method for preparing spunlace non - woven fabric, the spunlace pressure of the second spunlace head is 60 - 130 bar.

[0014] In the above - mentioned method for preparing spunlace non - woven fabric, the conveying speed of the spunlace assembly is 5 m / min.

[0015] Compared with the prior art, the positive effects of the present invention are as follows: 1. The present invention provides a method for treating polyethylene flash - spun non - woven material with a layered structure by spunlace to ensure that it does not delaminate while having a large porosity, so that the finished product maintains characteristics such as softness and breathability.

[0016] 2. The present invention discovers that as the spunlace pressure increases, the porosity decreases, but the tensile fracture strength of the product increases. This may be because when the spunlace pressure is small, the consolidation effect between fibers is not strong, and the material cannot be completely consolidated, so the sample strength is relatively low. As the spunlace pressure increases, the water flow pressure received by the fibers increases, the entanglement effect between fibers is enhanced, and the fiber web structure becomes more firm, that is, the strength of the formed spunlace non - woven material increases. Based on this, the present invention selects an appropriate range of spunlace pressure.

[0017] 3. The present invention discovers that after coating the spunlace conditioning liquid, the porosity can be improved to a certain extent on the premise of ensuring that the tensile strength at break of the product does not change significantly, thereby further improving the softness and breathability of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the invention; In the figure: non-woven material 1, feeding roller shaft 2, spunlace assembly 3, receiving roller shaft 4, flat screen assembly 5, liquid storage tank 6, front roller shaft 31, rear roller shaft 32, first spunlace head 33, second spunlace head 34. DETAILED DESCRIPTION OF THE INVENTION

[0021] The present invention will be further described in detail below in conjunction with the specific embodiments and the drawings.

[0022] Example 1 This example provides a method for preparing flash-spun spunlace non-woven fabric, as Figure 1 shown, including the following steps: Step 1: Flash evaporation to obtain a polyethylene flash-spun non-woven material 1; Step 2: Mix and prepare a spunlace conditioning liquid by mixing pentaerythritol and polyether organosilicon in a mass ratio of 1:1, inject the spunlace conditioning liquid into the liquid storage tank 6, and start the flat screen assembly 5 to make the surface of the flat screen assembly 5 infiltrated with the spunlace conditioning liquid; Step 3: Press the non-woven material 1 prepared in Step 1 onto the feeding roller shaft 2, flat screen assembly 5, front roller shaft 31, rear roller shaft 32, and receiving roller shaft 4 in sequence. Use the flat screen assembly 5 to flatten the non-woven material 1 and coat the spunlace conditioning liquid on the non-woven material 1. Start the first spunlace head 33 and the second spunlace head 34 to perform spunlace treatment on the non-woven material 1 passing through the front roller shaft 31 and the rear roller shaft 32. The spunlace pressure of the first spunlace head 33 is 20 bar, the spunlace pressure of the second spunlace head 34 is 50 bar, and the conveying speed of the non-woven material 1 is 5 m / min.

[0023] Among them, the polyether organosilicon is HY-6803 polyether-modified organosilicon purchased from Shanghai Huiyan New Materials Co., Ltd. Example 2 This example provides a method for preparing flash-spun spunlace non-woven fabric, as Figure 1 shown, including the following steps: Step 1: Flash evaporation to obtain a polyethylene flash-spun non-woven material 1; Step 2: Mix and prepare a spunlace conditioning liquid by mixing pentaerythritol and polyether silicone in a mass ratio of 1:1, inject the spunlace conditioning liquid into the liquid storage tank 6, start the flat screen assembly 5 to make the surface of the flat screen assembly 5 soaked with the spunlace conditioning liquid; Step 3: Press the non-woven material 1 prepared in Step 1 in sequence on the feeding roller shaft 2, the flat screen assembly 5, the front roller shaft 31, the rear roller shaft 32 and the receiving roller shaft 4. Use the flat screen assembly 5 to flatten the non-woven material 1 and coat the spunlace conditioning liquid on the non-woven material 1. Start the first hydroentangling head 33 and the second hydroentangling head 34 to perform hydroentangling treatment on the non-woven material 1 passing through the front roller shaft 31 and the rear roller shaft 32. The hydroentangling pressure of the first hydroentangling head 33 is 40 bar, the hydroentangling pressure of the second hydroentangling head 34 is 60 bar, and the conveying speed of the non-woven material 1 is 5 m / min.

[0025] Among them, the polyether silicone is HY-6803 polyether-modified silicone purchased from Shanghai Huiyan New Materials Co., Ltd. Example 3 This example provides a method for preparing flash-spun hydroentangled non-woven fabric, as Figure 1 shown, including the following steps: Step 1: Flash-spin to obtain a polyethylene flash-spun non-woven material 1; Step 2: Mix and prepare a spunlace conditioning liquid by mixing pentaerythritol and polyether silicone in a mass ratio of 1:1, inject the spunlace conditioning liquid into the liquid storage tank 6, start the flat screen assembly 5 to make the surface of the flat screen assembly 5 soaked with the spunlace conditioning liquid; Step 3: Press the non-woven material 1 prepared in Step 1 in sequence on the feeding roller shaft 2, the flat screen assembly 5, the front roller shaft 31, the rear roller shaft 32 and the receiving roller shaft 4. Use the flat screen assembly 5 to flatten the non-woven material 1 and coat the spunlace conditioning liquid on the non-woven material 1. Start the first hydroentangling head 33 and the second hydroentangling head 34 to perform hydroentangling treatment on the non-woven material 1 passing through the front roller shaft 31 and the rear roller shaft 32. The hydroentangling pressure of the first hydroentangling head 33 is 80 bar, the hydroentangling pressure of the second hydroentangling head 34 is 100 bar, and the conveying speed of the non-woven material 1 is 5 m / min.

[0027] Among them, the polyether silicone is HY-6803 polyether-modified silicone purchased from Shanghai Huiyan New Materials Co., Ltd. Example 4 This example provides a method for preparing flash-spun hydroentangled non-woven fabric, as Figure 1 shown, including the following steps: Step 1: Flash-spin to obtain a polyethylene flash-spun non-woven material 1; Step 2: Mix and prepare a spunlace conditioning solution by mixing pentaerythritol and polyether silicone in a mass ratio of 1:1, inject the spunlace conditioning solution into the liquid storage tank 6, start the flat screen assembly 5, and make the surface of the flat screen assembly 5 infiltrated with the spunlace conditioning solution; Step 3: Press the non-woven material 1 prepared in Step 1 in sequence on the feeding roller shaft 2, the flat screen assembly 5, the front roller shaft 31, the rear roller shaft 32 and the receiving roller shaft 4, use the flat screen assembly 5 to flatten the non-woven material 1 and coat the spunlace conditioning solution on the non-woven material 1, start the first hydroentangling head 33 and the second hydroentangling head 34 to perform hydroentangling treatment on the non-woven material 1 passing through the front roller shaft 31 and the rear roller shaft 32. The hydroentangling pressure of the first hydroentangling head 33 is 100 bar, the hydroentangling pressure of the second hydroentangling head 34 is 130 bar, and the conveying speed of the non-woven material 1 is 5 m / min.

[0029] Among them, the polyether silicone is HY-6803 polyether-modified silicone purchased from Shanghai Huiyan New Materials Co., Ltd. Example 5 This example provides a method for preparing flash-spun hydroentangled non-woven fabric, as Figure 1 shown, including the following steps: Step 1: Flash-spin to obtain a polyethylene flash-spun non-woven material 1; Step 2: Mix and prepare a spunlace conditioning solution by mixing pentaerythritol and polyether silicone in a mass ratio of 1:1, inject the spunlace conditioning solution into the liquid storage tank 6, start the flat screen assembly 5, and make the surface of the flat screen assembly 5 infiltrated with the spunlace conditioning solution; Step 3: Press the non-woven material 1 prepared in Step 1 in sequence on the feeding roller shaft 2, the flat screen assembly 5, the front roller shaft 31, the rear roller shaft 32 and the receiving roller shaft 4, use the flat screen assembly 5 to flatten the non-woven material 1 and coat the spunlace conditioning solution on the non-woven material 1, start the first hydroentangling head 33 and the second hydroentangling head 34 to perform hydroentangling treatment on the non-woven material 1 passing through the front roller shaft 31 and the rear roller shaft 32. The hydroentangling pressure of the first hydroentangling head 33 is 120 bar, the hydroentangling pressure of the second hydroentangling head 34 is 150 bar, and the conveying speed of the non-woven material 1 is 5 m / min.

[0031] Among them, the polyether silicone is HY-6803 polyether-modified silicone purchased from Shanghai Huiyan New Materials Co., Ltd. Comparative Example 1 This comparative example provides a method for preparing flash-spun hydroentangled non-woven fabric, as Figure 1 shown, including the following steps: Step 1: Flash-spin to obtain a polyethylene flash-spun non-woven material 1; Step 2: Mix and prepare a spunlace conditioning solution by mixing pentaerythritol and polyether silicone in a mass ratio of 1:1, inject the spunlace conditioning solution into the liquid storage tank 6, and start the flat screen component 5 to make the surface of the flat screen component 5 infiltrated with the spunlace conditioning solution; Step 3: Press the non-woven material 1 prepared in Step 1 successively on the feeding roller shaft 2, the flat screen component 5, the front roller shaft 31 and the receiving roller shaft 4, use the flat screen component 5 to coat the spunlace conditioning solution on the non-woven material 1, start the first hydroentangling head 33 to perform hydroentangling treatment on the non-woven material 1 passing through the front roller shaft 31, the hydroentangling pressure of the first hydroentangling head 33 is 100 bar, and the conveying speed of the non-woven material 1 is 5 m / min.

[0033] Among them, the polyether silicone is HY-6803 polyether-modified silicone purchased from Shanghai Huiyan New Materials Co., Ltd. Comparative Example 2 This comparative example provides a method for preparing flash-spun hydroentangled non-woven fabric, as Figure 1 shown, including the following steps: Step 1: Flash-spin to obtain a polyethylene flash-spun non-woven material 1; Step 2: Mix and prepare a spunlace conditioning solution by mixing pentaerythritol and polyether silicone in a mass ratio of 1:1, inject the spunlace conditioning solution into the liquid storage tank 6, and start the flat screen component 5 to make the surface of the flat screen component 5 infiltrated with the spunlace conditioning solution; Step 3: Press the non-woven material 1 prepared in Step 1 successively on the feeding roller shaft 2, the flat screen component 5, the rear roller shaft 32 and the receiving roller shaft 4, use the flat screen component 5 to coat the spunlace conditioning solution on the non-woven material 1, start the second hydroentangling head 34 to perform hydroentangling treatment on the non-woven material 1 passing through the rear roller shaft 32, the hydroentangling pressure of the second hydroentangling head 34 is 130 bar, and the conveying speed of the non-woven material 1 is 5 m / min.

[0035] Among them, the polyether silicone is HY-6803 polyether-modified silicone purchased from Shanghai Huiyan New Materials Co., Ltd. Comparative Example 3 This comparative example provides a method for preparing flash-spun hydroentangled non-woven fabric, as Figure 1 shown, including the following steps: Step 1: Flash-spin to obtain a polyethylene flash-spun non-woven material 1; Step 2: Press the non-woven material 1 prepared in Step 1 onto the feeding roller 2, flat screen assembly 5, front roller 31, rear roller 32, and receiving roller 4 in sequence. Use the flat screen assembly 5 to flatten the non-woven material 1, and start the first hydroentangling head 33 and the second hydroentangling head 34 to perform hydroentangling treatment on the non-woven material 1 passing through the front roller 31 and the rear roller 32. The hydroentangling pressure of the first hydroentangling head 33 is 100 bar, the hydroentangling pressure of the second hydroentangling head 34 is 130 bar, and the conveying speed of the non-woven material 1 is 5 m / min. Comparative Example 4 This comparative example provides a method for preparing flash-spun hydroentangled non-woven fabric, as Figure 1 shown, including the following steps: Step 1: Flash-spin to obtain a polyethylene flash-spun non-woven material 1; Step 2: Use pentaerythritol as the hydroentangling conditioning liquid, inject the hydroentangling conditioning liquid into the liquid storage tank 6, and start the flat screen assembly 5 to make the surface of the flat screen assembly 5 infiltrated with the hydroentangling conditioning liquid; Step 3: Press the non-woven material 1 prepared in Step 1 onto the feeding roller 2, flat screen assembly 5, front roller 31, rear roller 32, and receiving roller 4 in sequence. Use the flat screen assembly 5 to flatten the non-woven material 1 and coat the hydroentangling conditioning liquid on the non-woven material 1. Start the first hydroentangling head 33 and the second hydroentangling head 34 to perform hydroentangling treatment on the non-woven material 1 passing through the front roller 31 and the rear roller 32. The hydroentangling pressure of the first hydroentangling head 33 is 100 bar, the hydroentangling pressure of the second hydroentangling head 34 is 130 bar, and the conveying speed of the non-woven material 1 is 5 m / min. Comparative Example 5 This comparative example provides a method for preparing flash-spun hydroentangled non-woven fabric, as Figure 1 shown, including the following steps: Step 1: Flash-spin to obtain a polyethylene flash-spun non-woven material 1; Step 2: Use polyether silicone as the hydroentangling conditioning liquid, inject the hydroentangling conditioning liquid into the liquid storage tank 6, and start the flat screen assembly 5 to make the surface of the flat screen assembly 5 infiltrated with the hydroentangling conditioning liquid; Step 3: Press the non-woven material 1 prepared in Step 1 onto the feeding roller 2, flat screen assembly 5, front roller 31, rear roller 32, and receiving roller 4 in sequence. Use the flat screen assembly 5 to flatten the non-woven material 1 and coat the hydroentangling conditioning liquid on the non-woven material 1. Start the first hydroentangling head 33 and the second hydroentangling head 34 to perform hydroentangling treatment on the non-woven material 1 passing through the front roller 31 and the rear roller 32. The hydroentangling pressure of the first hydroentangling head 33 is 100 bar, the hydroentangling pressure of the second hydroentangling head 34 is 130 bar, and the conveying speed of the non-woven material 1 is 5 m / min.

[0039] Among them, the polyether silicone is HY-6803 polyether-modified silicone purchased from Shanghai Huiyan New Materials Co., Ltd. Application Example 1 The spunlace nonwoven fabric 1 was prepared by the preparation method described in Example 4; The spunlace nonwoven fabric 2 was prepared by the preparation method described in Comparative Example 1; The spunlace nonwoven fabric 3 was prepared by the preparation method described in Comparative Example 2; The spunlace nonwoven fabric 4 was prepared by the preparation method described in Comparative Example 3; The spunlace nonwoven fabric 5 was prepared by the preparation method described in Comparative Example 4; The spunlace nonwoven fabric 6 was prepared by the preparation method described in Comparative Example 5; The porosity and breaking strength of the spunlace nonwovens 1-6 were measured respectively, and the test methods are as follows: According to "GB / T 24218.2-2009 Textiles - Test methods for nonwovens - Part 2: Determination of thickness", 5 samples with better uniformity were cut from each spunlace nonwoven fabric, and a thickness gauge (32CHQF 1030, Deqing Shengtai Core Electronic Technology Co., Ltd., China) was used for testing. After the test was completed, the average value of the 5 groups of data was calculated to obtain the thickness δ.

[0041] According to "GB / T 24218.1-2009 Textiles - Test methods for nonwovens - Part 1: Determination of mass per unit area", 5 samples with better uniformity were cut from each spunlace nonwoven fabric, and a high-precision electronic balance (BT456A 300, Shenzhen BOTU Electronic Technology Co., Ltd., China) was used for measurement. The average value of the 5 groups of data was calculated to obtain the areal density m.

[0042] The porosity was calculated based on the areal density and thickness, and the calculation formula is as follows: Among them, n is the porosity, p is the fiber density (g / m 3 ), m is the areal density (g / m 2 ), and δ is the thickness (m).

[0043] According to "GB / T 24218.3-2010 Textiles - Test methods for nonwovens - Part 3: Determination of breaking strength and elongation at break (strip method)", 3 rectangular samples of 20 cm × 5 cm were cut from each spunlace nonwoven fabric. The samples were clamped between the upper and lower clamps of an electronic fabric strength tester (HD026S-100, Nantong Hongda Experimental Instrument Co., Ltd., China), and it was ensured that the samples were flat and wrinkle-free when clamped. The starting device was set to set the instrument stretching mode to constant speed stretching, and the starting device was started until the sample was broken, and the breaking strength was recorded.

[0044] The test results are shown in the following table: Experimental group Porosity (%) Breaking strength (N) Hydroentangled nonwoven fabric 1 82.7 97.4 Hydroentangled nonwoven fabric 2 83.0 90.3 Hydroentangled nonwoven fabric 3 77.2 96.1 Hydroentangled nonwoven fabric 4 75.1 97.3 Hydroentangled nonwoven fabric 5 75.4 97.4 Hydroentangled nonwoven fabric 6 75.8 97.4 Result analysis: By comparing the above data, it can be seen that the spunlace nonwoven fabric 1 has the highest porosity, achieving the expected purpose of the present invention.

[0045] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways of substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0046] Although terms such as nonwoven material 1, feed roller shaft 2, spunlace assembly 3, receiving roller shaft 4, flat screen assembly 5, liquid storage tank 6, front roller shaft 31, rear roller shaft 32, first spunlace head 33, second spunlace head 34, etc. are used more frequently in this article, the possibility of using other terms is not excluded. Using these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A method for preparing a flash-spun spunlace nonwoven fabric, characterized in that: The following steps are involved: Step 1: flash evaporation to obtain a polyethylene flash nonwoven material (1); Step 2: one end of the nonwoven material (1) obtained in step 1 is pressed onto a feeding roller (2), the other end is passed through a flat mesh component (5), and then is hydroentangled by a hydroentanglement component (3), and finally pressed onto a receiving roller (4), wherein the bottom of the flat mesh component (5) is located in a liquid storage tank (6) and is immersed in the hydroentanglement conditioning liquid.

2. The method for preparing the flash-spun spunlace nonwoven fabric according to claim 1, characterized in that: The spunlace conditioning liquid comprises pentaerythritol and polyether silicone in a mass ratio of 1:

1.

3. The method for preparing the flash-spun spunlace nonwoven fabric according to claim 1, characterized in that: The spunlace component (3) comprises a spunlace roller shaft and a spunlace head located on one side of the spunlace roller shaft, and the nonwoven material (1) is pressed onto the surface of the spunlace roller shaft.

4. The method for preparing a flash-spun spunlace nonwoven fabric according to claim 3, characterized in that: A negative pressure structure capable of generating suction on the surface non-woven material (1) is arranged inside the water entanglement roller shaft, and the negative pressure structure comprises a vacuum pump.

5. The method for preparing the flash-spun spunlace nonwoven fabric according to claim 3, characterized in that: The spurting roller comprises a front roller (31) close to the feeding roller (2) and a rear roller (32) close to the receiving roller (4); a first spurting head (33) is provided on one side of the front roller (31); a second spurting head (34) is provided on one side of the rear roller (32); and the spurting pressure of the second spurting head (34) is greater than the spurting pressure of the first spurting head (33).

6. The method for preparing the flash-spun spunlace nonwoven fabric according to claim 5, characterized in that: The water jet pressure of the first water jet head (33) is 20-120 bar.

7. The method for preparing the flash-spun spunlace nonwoven fabric according to claim 6, characterized in that: The water jet pressure of the first water jet head (33) is 40-100 bar.

8. The method for preparing the flash-spun spunlace nonwoven fabric according to claim 5, characterized in that: The water jet pressure of the second water jet head (34) is 50-150 bar.

9. The method for preparing a flash-spun spunlace nonwoven fabric according to claim 8, characterized in that: The water jet pressure of the second water jet head (34) is 60-130 bar.

10. The method for preparing a flash-spun spunlace nonwoven fabric according to claim 1, characterized in that: The conveying speed of the water spunlace component (3) is 5 m / min.

Images