KR100993943B1 - Breathable and water-proof materials laminated with electrospun nanoweb partially coated with polyurethane dispersion, and a method for preparation of the same - Google Patents

Abstract

The present invention provides a polyester base fabric comprising (i) a polyester base fabric; (ii) electrospun nanoweb laminated on the polyester base fabric; And (iii) a water-dispersible polyurethane coating partially coated on the electrospun nanoweb using a mesh for surface treatment. In addition, the present invention provides a method for producing a waterproof moisture-permeable material, comprising: (a) laminating an electrospun nanoweb on a polyester base fabric; And (b) performing a surface treatment by partially coating a water-dispersed polyurethane (PUD) on the electrospun nanoweb using a mesh.

According to the present invention, by improving the durability and water resistance of the electrospun nanoweb through the partial coating surface treatment using a water-dispersed polyurethane, while maintaining the pore characteristics, excellent air and moisture permeability compared to conventional water-permeable materials And with high air content, it can mass-produce materials with excellent heat shielding ability. In addition, it is possible to apply a variety of clothing material by changing the application amount of the surface treatment agent to adjust the water resistance and moisture permeability suitable for each application.

Waterproof fabric, base fabric, electrospun nanoweb, water-dispersed polyurethane (PUD), laminating, surface treatment, mesh, partial coating, durability, water resistance, tensile strength, tear strength, wear strength, comfort , Air permeability, moisture permeability, thermal conductivity, warmth, heat resistance.

Description

BREATHABLE AND WATER-PROOF MATERIALS LAMINATED WITH ELECTROSPUN NANOWEB PARTIALLY COATED WITH POLYURETHANE DISPERSION, AND A METHOD FOR PREPARATION OF THE SAME}

The present invention relates to a moisture-permeable waterproof material having improved durability (water resistance, tensile strength, tear strength, abrasion strength, etc.) and comfort (air permeability, moisture permeability, thermal conductivity, heat retention) and a method of manufacturing the same. More specifically, the present invention relates to a moisture-permeable waterproof material on which an electrospun nanoweb is laminated, and a water-repellent waterproof material surface-treated by a partial coating of a water-dispersed polyurethane, and a method of manufacturing the same.

Increasing interest in sports and leisure activities as the development of the living environment, requests for the necessity of various sports apparel, and the desire of consumers to emphasize the comfort and stability of wearing the apparel have increased interest in the development of functional materials. I have been. In particular, the functional clothing for outdoor sports is emphasized as a device that protects the body safely and comfortably from natural phenomena, not merely clothes, and in the case of the moisture-permeable waterproof fabric widely used as the material In addition to improving the function and maintaining the basic functionality, research and development are being actively conducted for a combination of comfort, warmth, elasticity and antibacterial properties.

Existing moisture-permeable waterproof materials do not sufficiently dissipate the internal sweat, water vapor, heat, etc. emitted from the human body compared to the waterproof performance to the outside when wearing clothing made of these materials has always been a problem. Therefore, there is a need for the development of electrospun nanoweb, which is a comfortable material that adds light weight and warmth to high permeability that is not provided by the conventional moisture-permeable waterproof material.

Electrospun nanoweb can adjust the size of the pores by controlling the fiber diameter and the number of lamination. Therefore, when the nanofiber nonwoven fabric and the microfiber nonwoven fabric are properly combined, they can be used as various filter media capable of purifying water, oil, air and the like. In addition, when applied to clothing, due to the structural factors of microporosity, it exhibits breathability that can release sweat inside, and is lightweight due to its low volume-to-mass ratio, and is waterproof and windproof on the outside of the membrane. It is effective, and it has a characteristic that it can realize the light weight and heat retention of the fabric which has a lot of air content and a moisture-permeable waterproof effect simultaneously.

However, electrospinning nanowebs are limited in their application to garments due to their structural characteristics. Electrospun nanoweb has a weaker strength than conventional film-type membranes because non-directional fibrous is not fixed with adhesive, but consists of a laminated structure. Therefore, when the force is applied to the electrospun nanoweb, Scratch occurs as the fibers are pushed. In addition, due to the structural characteristics of the laminated structure of the nanoweb and the elasticity of the polyurethane, the voids are opened when water pressure is applied, so that the water resistance is lower than that of the conventional moisture-permeable waterproof material.

Accordingly, the present inventors have developed a moisture-permeable waterproof material that improves durability and comfort at the same time by supplementing the strength of the electrospun nanoweb through PUD surface treatment using a partial coating method using a mesh. The present inventors performed the surface treatment of the partial coating method to supplement the strength without reducing the microporosity, which is the characteristic of the electrospun nanoweb, and selected the water-dispersed polyurethane as the surface treatment agent to minimize the damage of the nanoweb, According to the end use, the application amount of water-dispersed polyurethane was adjusted to be applied to various products, and the applicability evaluation was made by comparing with the conventional moisture-permeable waterproof material while examining how the durability and moisture-permeable waterproof were changed.

According to the present invention, after laminating an electrospun nanoweb (particularly, an electrospun polyurethane nanoweb) on a polyester base fabric, surface treatment is performed by water-dispersed polyurethane partial coating using a mesh, thereby improving durability (water resistance, An object of the present invention is to provide a moisture-permeable waterproof material having improved tensile strength, tear strength, abrasion strength, and comfort (air permeability, moisture permeability, thermal conductivity, heat resistance, thermal insulation), and a method of manufacturing the same.

The present invention is a moisture-permeable waterproof material having improved durability (water resistance, tensile strength, tear strength, abrasion strength) and comfort (air permeability, moisture permeability, thermal conductivity, heat resistance, thermal insulation), and the like (i) Polyester base fabric ; (ii) electrospun nanoweb laminated on the polyester base fabric; And (iii) a water-dispersible polyurethane coating partially coated on the electrospun nanoweb using a mesh for surface treatment.

In the present invention, the polyester base fabric is more preferably 100% polyester plain weave treated with water repellent. This is because, when the base fabric is not water-repellent, the adhesive is permeated during the bonding process so that the adhesive adheres to the surface of the fabric and is not uniformly applied.

In the present invention, the electrospun nanoweb is preferably an electrospun polyurethane nanoweb having a thickness of 10 to 20㎛. A moisture curable adhesive (solvent: ethyl acetate) is used for laminating the electrospun nanoweb. In order to minimize damage of the electrospun nanoweb, it is preferable to partially apply the moisture curable adhesive and semi-dry to remove the solvent.

Solvent type polyurethanes that have been widely used in the prior art have a problem that a strong solvent such as dimethylformamide (DMF) or methyl ethyl ketone (MEK) causes damage to the nanoweb, further worsening the durability of the moisture-permeable waterproof material, In the present invention, it is possible to minimize the damage of the electrospun nanoweb by using a water-dispersed polyurethane (PUD) as a surface treatment agent. The water-dispersed polyurethane preferably contains dimethylol propionic acid (DMPA) as a hydrophilic agent, triethylamine (TEA) as a neutralizing agent, and ethylenediamine (EDA) as a chain extender. However, since the small amount of n-methyl-2-pyrrolidone (NMP) required when DMPA is added causes damage to the electrospun polyurethane nanoweb, it is preferable that the water-dispersed polyurethane does not contain NMP.

It is preferable that the moisture-permeable waterproofing material of this invention is 0.1-0.2 mm in total thickness. The moisture-permeable waterproofing material of the present invention is improved in durability (water resistance, tensile strength, tear strength, wear strength, etc.) and comfort (air permeability, moisture permeability, thermal conductivity, and thermal insulation) as compared with the conventional moisture-permeable waterproof material.

In addition, the present invention comprises the steps of (a) laminating the electrospun nanoweb on a polyester-based base fabric; And (b) performing a surface treatment by partially coating a water-dispersed polyurethane (PUD) on the electrospun nanoweb using a mesh.

The step (a) is preferably performed by laminating 10-20 μm thick electrospun polyurethane nanoweb on a water repellent 100% polyester plain weave using a moisture curable adhesive. In the case of using a base fabric that is not water repellent, the adhesive is permeated during the bonding process, so that the adhesive is deposited on the surface of the fabric and is not uniformly applied. A moisture curable adhesive (solvent: ethyl acetate) is used for laminating the electrospun nanoweb. In order to minimize damage of the electrospun nanoweb, it is preferable to partially apply the moisture curable adhesive and semi-dry to remove the solvent.

Cylindrical screen-type mesh rolls using a bonding machine with a micro gravure system are rotated in a bath containing water-dispersed polyurethane (PUD), while the water-dispersed polyurethane is recessed in the groove recessed in the mesh. The water-dispersed polyurethane contained in the grooves of the mesh roll is partially applied onto the electrospun nanoweb as the immersed, polyester-based fabric laminated with the electrospun nanoweb passes between the mesh roll and the press roll. The coated water-dispersed polyurethane is dried for 3 to 4 minutes at 80 ° C. while passing through a drying chamber, whereby the surface treatment of step (b) is preferably performed. The mesh roll is preferably used 250 mesh roll, 200 mesh roll or 150 mesh roll, the coating amount is preferably 250 mesh <200 mesh <150 mesh.

According to the present invention, by improving the durability and water resistance of the electrospun nanoweb through the partial coating surface treatment using a water-dispersible polyurethane, while maintaining the pore characteristics, air and moisture permeability superior to the conventional moisture-permeable waterproof material And with high air content, it can mass-produce materials with excellent heat shielding ability. In addition, it is possible to apply a variety of clothing material by changing the application amount of the surface treatment agent to adjust the water resistance and moisture permeability suitable for each application.

Through the following examples will be described in more detail the present invention. However, the following examples are only for illustrating the present invention, and the scope of the present invention should not be construed as being limited to the following examples. Therefore, it will be understood by those skilled in the art that various modifications, modifications and applications of the following embodiments are possible within the scope of the technical idea derived from the matters described in the appended claims.

Example

Samples consisting solely of 100% polyester plain weave (base fabric) without water repellent were obtained from PET (Comparative Example 1); Samples composed only of 100% polyester plain weave (base fabric) treated with water repellent were prepared by WR-PET (Comparative Example 2); Samples in which electrospun nanowebs were laminated on 100% polyester plain weave (base fabric) treated with water repellent were nano (Comparative Example 3); Laminating the electrospun polyurethane nanoweb on a 100% polyester plain weave (base fabric) that is water repellent and then partially coating the water-dispersed polyurethane (PUD) on the electrospun polyurethane nanoweb using 250 mesh The sample obtained by performing the surface treatment was Nano I (Nano 250) (Example 1); By laminating the electrospun polyurethane nanoweb on a 100% polyester plain weave (base fabric) that is water repellent, and then partially coating the water-dispersed polyurethane (PUD) on the electrospun polyurethane nanoweb using 200 mesh The sample obtained by performing surface treatment was Nano II (Nano 200) (Example 2); Laminating the electrospun polyurethane nanoweb on a 100% polyester plain weave (base fabric) that has been water repellent, and then partially coating the water-dispersed polyurethane (PUD) on the electrospun polyurethane nanoweb using 150 mesh. The sample obtained by performing surface treatment was Nano III (Nano 150) (Example 3); PTFE (Comparative Example 4) was prepared by bonding a polytetrafluoroethylene (PTFE) membrane to a water repellent or non-water repellent 100% polyester plain weave (base fabric); Samples in which a hydrophilic polyurethane membrane was bonded onto 100% polyester plain weave (base fabric), either water repellent or non-water repellent, were shown as H-PU (Comparative Example 5), respectively. Laminating of the electrospun nanoweb was carried out by laminating a 13 μm thick electrospun nanoweb on 100% polyester plain weave with water repellent using a moisture curable adhesive (solvent: ethyl acetate), the surface treatment being in the form of a cylindrical screen Mesh rolls are rotated in a bath containing water-dispersed polyurethane (PUD) while the water-dispersed polyurethane is contained in the groove recessed into the mesh, and the mesh roll and press roll The water-dispersed polyurethane contained in the grooves of the mesh roll is partially applied onto the electrospun nanoweb as the polyester-based fabric with the electrospun nanoweb laminated therebetween passes, and the applied water-dispersed polyurethane is dried in a drying chamber. Drying at 80 ° C. for 3-4 minutes.

The samples were tested for characteristics such as durability, water resistance and comfort. In the case of durability, surface properties were measured by scanning electron microscopy, tensile strength was measured by ASTM D5035 strip method, tear strength was measured by ASTM D 2261 tongue method, and wear strength was measured by ASTM D 3884 taber method. Was measured. Water resistance was measured by the ISO 811 low water pressure method and the ATCC 22 rainwater test method, respectively. In the case of properties related to comfort, pore distribution and frequency were measured using a non-mercury capillary pressure gauge (CF-1500 Porometer, AEL, USA), air permeability was measured by ASTM D 737 method, moisture permeability was ASTM E 96 The thermal conductivity was measured using a KES-F7 system (Kato Co., Ltd.), and the thermal resistance (Rct) was measured by the ISO 11092 method.

durability

Surface properties

Figure 4 is a magnified 10000 times by scanning electron microscope to examine the appearance characteristics of the electrospun nanoweb, showing the lamination state of the nanofibers of relatively uniform fiber diameter of 200-700nm.

5 is a magnified photograph of 100 times and 2000 times in order to examine the surface state of each sample, and shows a well-coated state when the surface of the water-dispersed polyurethane is surface-treated with a mesh on the electrospun nanoweb, It can be seen that the coating area for each mesh is different.

The tensile strength

Tensile strength measurements showed no significant difference between electrospun nanoweb applied samples and conventional moisture-permeable materials, because the thickness of the membrane had a greater influence on the properties of the base fabric than on the membrane. Seemed.

After the surface treatment, the tensile strength increased in both the warp and weft directions as the coating amount increased in the order of Nano I (Nano-250) <Nano II (Nano-200) <Nano III (Nano-150).

Tensile elongation

Tensile elongation measurements did not show a significant difference between the electrospun nanoweb applied samples and conventional moisture-permeable materials, because the thickness of the membrane had a greater influence on the properties of the base fabric than on the membrane properties. Seemed.

After surface treatment, the tensile elongation also increased as the coating amount increased in both the warp and weft directions.

Tear  burglar

After surface treatment, the tear strength increased in both the warp and weft directions.

Wear strength

The weight reduction rate of the electrospinning nanoweb applied sample was higher than that of the PTFE applied sample or the H-PU applied sample, because the nanoweb is a nonwoven fabric having a laminated structure, and thus surface scratches occur even with a small force.

After surface treatment of the electrospun nanoweb, the wear rate decreased as the coating amount increased in the order of Nano I (Nano-250)> Nano II (Nano-200)> Nano III (Nano-150).

Electrospun nanoweb applied samples without surface treatment had the most damage due to the dropping of the membrane, and after surface treatment, Nano I (Nano-250) <Nano II (Nano-200) <Nano III (Nano-150) As the coating amount increased in order, it was confirmed that the drop off of the membrane decreased. On the other hand, the PTFE applied sample, which is a conventional moisture-permeable waterproof material, had a small number of membrane dropouts after abrasion but was damaged as the membrane was pushed, and the H-PU applied sample had little dropout and damage.

Water resistance

Low water pressure  Water resistance

The water resistance measured by the low water pressure method uses pressure units, and the larger the value, the better the waterproof performance. In case of water resistance according to the hydrostatic method, the value of electrospun nanoweb applied sample without surface treatment is higher than that of base fabric, but the waterproof performance is lower than that of conventional PTFE or H-PU sample. You can also see big ones. This is thought to be a phenomenon that occurs when the air pressure is applied, since the structure of the electrospun nanoweb made of elastic polyurethane is made of a laminated structure like a nonwoven fabric.

After surface treatment of the electrospun nanoweb, the water resistance increased in the order of Nano I (Nano-250) <Nano II (Nano-200) <Nano III (Nano-150). As a result of analyzing the correlation between the coating amount and the water resistance, it was confirmed that the water resistance increased as the coating amount was increased to 0.99.

Water resistance according to the rainwater test

The water resistance value measured by the rainwater test method is a weight change amount of the absorbent paper located on the backside of the sample after the rainwater exposure. In the case of the water resistance of each sample by the rainwater test method, the electrospun nanoweb applied sample showed a lower value than the conventional PTFE applied sample or the H-PU applied sample. The difference was not great.

After surface treatment on the electrospun nanoweb, the water resistance increased as the coating amount increased in the order of Nano I (Nano-250) <Nano II (Nano-200) <Nano III (Nano-150). The correlation of was also significant.

Comfort

Pore size and distribution

The pores of the electrospun nanoweb applied sample without surface treatment were the most widely distributed in the range of 1.4∼9.0㎛, in order of Nano I (Nano-250)> Nano II (Nano-200)> Nano III (Nano-150). As the coating amount increased, it was confirmed that the pore distribution narrowed.

Air permeability

Although the air permeability of the electrospun nanoweb applied sample was lower than the air permeability of the base fabric, the air permeability was found to have sufficient air permeability. The conventional PTFE applied sample or H-PU applied sample Compared with the air permeability was confirmed.

After surface treatment of electrospun nanoweb, air permeability tended to be higher in order of Nano I (Nano-250)> Nano II (Nano-200)> Nano III (Nano-150).

Moisture permeability

After the surface treatment on the electrospun nanoweb, the moisture permeability was high in the order of Nano I (Nano-250)> Nano II (Nano-200)> Nano III (Nano-150). As a result of the analysis, as the coating amount increased, it was confirmed that the moisture permeability decreased.

In general, the waterproof performance of the material tends to be opposite to the permeation performance through air and water vapor, so that the higher the waterproof performance, the lower the permeability, and the lower the comfort, and the higher the permeation performance to increase the comfort, the lower the waterproof performance. Indicates. Increasing the coating amount during the surface treatment shows the opposite property of increasing the water resistance but lowering the moisture permeability. It is expected that the application of various clothing materials may be possible by changing the coating amount of the surface treatment agent to adjust the water resistance and moisture permeability suitable for each use.

On the other hand, the correlation between the air permeability and the moisture permeability was 0.82, it was confirmed that the most of the moisture permeation of the sample is directly transmitted through the pores.

Thermal conductivity

When surface treatment on the electrospun nanoweb, the thermal conductivity increases as the coating amount increases in the order of Nano I (Nano-250)> Nano II (Nano-200)> Nano III (Nano-150). This is because the area of the nanoweb, which may contain an air layer after surface treatment, decreases as the coating amount increases.

Heat resistance Rct )

The higher the thermal resistance value, the higher the thermal barrier performance, indicating the excellent thermal insulation performance. The electrospun nanoweb applied sample was found to have a higher thermal barrier property than the conventional PTFE applied sample or the H-PU applied sample.

When surface treatment is performed on the electrospun nanoweb, the heat resistance decreases as the coating amount is increased. This is because the surface area of the nanoweb, which may contain the air layer during surface treatment, decreases as the coating amount increases.

The above experimental results are summarized as follows:

As a result of measuring the surface properties with a differential scanning microscope, it was confirmed that the partial coating of the water-dispersed polyurethane on the electrospun nanoweb was successful, and the coating area increased with the increase of the coating amount.

After surface treatment on the electrospun nanoweb applied sample, the tensile strength, tear strength, and abrasion strength were increased as the coating amount increased in the order of Nano-250 <Nano-200 <Nano 150. Could.

After surface treatment on the electrospun nanoweb applied samples, the water resistance increased. In particular, the water resistance measurement by the low pressure method showed a value of 3000 or more, indicating that the waterproofing capability as a waterproof moisture-permeable material was sufficient.

As a result of analyzing the pore distribution of the sample, the untreated nanoweb sample was widely distributed in the range of 1.4-9.0㎛, and the pore distribution decreased as the coating amount increased after the surface treatment, but it was not significant enough to affect the function.

After the surface treatment on the electrospun nanoweb applied sample, the air permeability, moisture permeability, and thermal barrier performance decreased as the coating amount increased in the order of Nano-250> Nano-200> Nano 150. It was confirmed that the material is a comfortable moisture-proof waterproof.

Figure 1 shows the structure of the moisture-permeable waterproof material laminated with the water-dispersed polyurethane partially coated electrospun nanoweb according to the present invention.

Figure 2 is a process chart for the production of a moisture-permeable waterproof material laminated with a water-dispersible polyurethane partially coated electrospun nanoweb according to the present invention.

FIG. 3 shows a configuration of an apparatus for surface treatment of a moisture-permeable waterproof material in which an electrospun nanoweb is laminated by a partial coating of a water-dispersed polyurethane.

4 is a magnified photograph of an electrospinning nanoweb 10000 times with a scanning electron microscope.

5 is a photograph enlarged 100 times and 2000 times the moisture-permeable waterproofing materials and the conventional moisture-permeable waterproofing materials according to the preferred embodiment of the present invention.

Figure 6 is a graph showing the tensile strength in the warp and weft direction of the water-permeable waterproof materials and the conventional water-permeable waterproof materials according to a preferred embodiment of the present invention.

7 is a graph showing the tensile elongation in the warp and weft direction of the moisture-permeable waterproofing materials and the conventional water-permeable waterproofing material according to a preferred embodiment of the present invention.

Figure 8 is a graph showing the tear strength in the inclined and weft direction of the water-permeable waterproof materials and the conventional water-permeable waterproof materials according to a preferred embodiment of the present invention.

9 is a graph showing the wear strength (weight loss rate) of the moisture-permeable waterproofing materials and the conventional moisture-permeable waterproofing materials according to the preferred embodiment of the present invention.

10 is a photograph showing the surface state after abrasion of the moisture-permeable waterproofing materials and the conventional moisture-permeable waterproofing material according to the preferred embodiment of the present invention.

11 is a graph showing the water resistance by the low water pressure method of the moisture-permeable waterproofing materials and the conventional moisture-permeable waterproofing materials according to the preferred embodiment of the present invention.

12 is a graph showing the water resistance by the rainwater test method of the moisture-permeable waterproofing materials and the conventional water-permeable waterproofing material according to a preferred embodiment of the present invention.

FIG. 13 is a graph showing pore distribution and frequency after surface treatment with water-dispersed polyurethane by varying the coating amount on the electrospun nanoweb.

14 is a graph showing the air permeability of the moisture-permeable waterproofing materials and the conventional moisture-permeable waterproofing materials according to the preferred embodiment of the present invention.

15 is a graph showing the water vapor transmission rate of the moisture-permeable waterproofing materials and the conventional water-permeable waterproofing material according to the preferred embodiment of the present invention.

FIG. 16 is a graph showing a correlation between the air permeability in FIG. 14 and the water vapor transmission rate in FIG. 15.

17 is a graph showing the thermal conductivity of moisture-permeable waterproof materials and conventional moisture-permeable materials according to a preferred embodiment of the present invention.

18 is a graph showing the heat resistance of the moisture-permeable waterproofing materials and the conventional moisture-permeable waterproofing materials according to the preferred embodiment of the present invention.

Claims (10)

(i) polyester-based base fabrics; (ii) electrospun nanoweb laminated on the polyester base fabric; And (iii) a water-dispersible polyurethane coating partially coated on the electrospun nanoweb using a mesh for surface treatment. The method of claim 1, The polyester base fabric is moisture-permeable waterproof material, characterized in that 100% polyester plain weave is water repellent. The method of claim 1, The electrospun nanoweb is a moisture-permeable waterproof material, characterized in that the electrospun polyurethane nanoweb 10 ~ 20㎛ thickness. The method of claim 1, The water-dispersible polyurethane contains a dimethylol propionic acid (DMPA) as a hydrophilic agent, triethylamine (TEA) as a neutralizing agent, and ethylenediamine (EDA) as a chain extender. The method of claim 4, wherein The water-dispersible polyurethane is waterproof material, characterized in that it does not contain n-methyl-2-pyrrolidone (NMP). The method according to any one of claims 1 to 5, The moisture-permeable waterproof material is a waterproof material, characterized in that the total thickness of 0.1 ~ 0.2 mm. (a) laminating the electrospun nanoweb on a polyester base fabric; And (b) performing a surface treatment by partially coating a water-dispersed polyurethane (PUD) on the electrospun nanoweb using a mesh. The method of claim 7, wherein The step (a) is performed by laminating an electrospun polyurethane nanoweb having a thickness of 10-20 μm on a 100% polyester plain weave treated with a moisture curable adhesive. . The method of claim 7, wherein Cylindrical screen-type mesh rolls using a bonding machine with a micro gravure system are rotated in a bath containing water-dispersed polyurethane (PUD), while the water-dispersed polyurethane is recessed in the groove recessed in the mesh. The water-dispersed polyurethane contained in the grooves of the mesh roll is partially applied onto the electrospun nanoweb as the immersed, polyester-based fabric laminated with the electrospun nanoweb is passed between the mesh roll and the press roll. The coated water-dispersed polyurethane is dried for 3 to 4 minutes at 80 ° C. while passing through a drying chamber, whereby the surface treatment of step (b) is performed. The method of claim 9, The mesh roll is a manufacturing method of the moisture-permeable waterproof material, characterized in that 250 mesh roll, 200 mesh roll or 150 mesh roll is used.

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