KR20230043583A - Flame-retardant non-woven fabric and preparation method thereof - Google Patents

Abstract

The present invention relates to a flame retardant nonwoven fabric, and more specifically, includes graphene viscose fiber, fiber A and low melting point polyester fiber, wherein the fiber A is graphene polyester fiber, graphene polyester hollow fiber, graphene nylon fiber , flame retardant viscose fiber, It is any one selected from the group consisting of flame retardant polyester fibers and flame retardant polypropylene fibers, wherein the fiber A is 10 to 40 parts by weight and the low melting point polyester fiber is 5 to 20 parts by weight relative to 100 parts by weight of the graphene viscose fiber. It is characterized by doing. The flame retardant nonwoven fabric according to the present invention has excellent flame retardancy, so even if a fire occurs, it is not easily incinerated, thereby preventing damage to life and property. In addition, the flame retardant nonwoven fabric according to the present invention has excellent heat retention, and thus has an effect of manufacturing bedding or clothing with enhanced heat retention than before.

Description

Flame retardant non-woven fabric and manufacturing method thereof {Flame-retardant non-woven fabric and preparation method thereof}

The present invention relates to a flame retardant nonwoven fabric having excellent flame retardancy and heat retention and a method for manufacturing the same.

In general, a mattress is placed on a bed frame that constitutes a bed used in each home and is used when people take a comfortable sleep and rest. absence is covered. As for the cover member, materials such as non-woven fabric, padding cotton, felt, fabric, etc. may be used alone or in combination to produce a cover member integrated with a known quilting method so that the cover member is covered on the outer circumferential surface of the tension element.

Such a conventional mattress is used by a person directly sitting or lying down, and the tension element has been researched and added only for the function of tension force, and the cover member to be covered on the outer circumferential surface of the tension element is in direct contact with the human body , Antibacterial, sterilization, and deodorization functions are only being pursued, so there is no inconvenience or problem during use. There is a problem in that the cover member made of the material is easily incinerated, and when incinerated, toxic gases that are harmful to the human body are generated, resulting in larger fires and human casualties.

Korean Patent Publication No. 2016-0000193 (2016.01.04)

The present invention has been derived to solve the above problems, and an object of the present invention is to provide a flame retardant nonwoven fabric having excellent flame retardancy that is not easily incinerated even if a fire occurs and a method for manufacturing the same.

The problem to be solved by the present invention is not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the following description. will be.

The present invention for solving the above problems relates to a flame retardant nonwoven fabric, and more specifically, includes graphene viscose fiber, fiber A and low melting point polyester fiber, wherein the fiber A is graphene polyester fiber, graphene poly Any one selected from the group consisting of ester hollow fibers, graphene nylon fibers, flame retardant viscose fibers , flame retardant polyester fibers and flame retardant polypropylene fibers, 10 to 40 parts by weight of the fiber A relative to 100 parts by weight of the graphene viscose fibers, The low-melting polyester fiber is characterized in that it contains 5 to 20 parts by weight.

In addition, another aspect of the present invention relates to a method for producing a flame retardant nonwoven fabric, and more specifically, (a) mixing graphene viscose fiber, fiber A and low melting point polyester fiber, wherein the fiber A is graphene polyester fiber, Graphene polyester hollow fiber, graphene nylon fiber, flame retardant viscose fiber, It is any one selected from the group consisting of flame retardant polyester fibers and flame retardant polypropylene fibers, and 10 to 40 parts by weight of the fiber A and 5 to 20 parts by weight of the low melting point polyester fiber are mixed with 100 parts by weight of the graphene viscose fiber. to prepare raw cotton; (b) performing a carding process on the raw cotton fabric prepared in step (a); (c) performing a multi-layer molding process on the raw material cotton passed through step (b); (d) performing a punching process of compressing upper and lower parts of the raw cotton that has passed through step (c); and (e) preparing a nonwoven fabric by drying the cotton raw material that has passed through step (d).

The flame retardant nonwoven fabric according to the present invention has excellent flame retardancy, so even if a fire occurs, it is not easily incinerated, thereby preventing damage to life and property.

In addition, the flame retardant nonwoven fabric according to the present invention has excellent heat retention, and thus has an effect of manufacturing bedding or clothing with enhanced heat retention than before.

In addition, the flame retardant nonwoven fabric according to the present invention can maintain the volume of the initial state as much as possible even if stress is accumulated as the user repeatedly lies down or sits for a long period of time, thereby maintaining the functional and appearance quality of the product for a long period of time. , It has the effect of having higher strength than conventional flame retardant nonwoven fabrics having the same thickness and width.

Since the present invention can apply various transformations and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, it should be understood that this is not intended to limit the present invention to specific embodiments, and includes all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the present invention, if it is determined that a detailed description of related known technologies may obscure the gist of the present invention, the detailed description will be omitted.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another.

The present invention relates to a flame retardant nonwoven fabric, and more specifically, includes graphene viscose fiber, fiber A and low melting point polyester fiber, wherein the fiber A is graphene polyester fiber, graphene polyester hollow fiber, graphene nylon fiber , flame retardant viscose fiber, Characterized in that it is any one selected from the group consisting of flame retardant polyester fibers and flame retardant polypropylene fibers.

In the present invention, the graphene viscose fiber is a viscose fiber containing a graphene material, and the graphene is one of carbon allotropes, and carbon atoms are present at the vertices of a hexagon (sp2 bond), and a two-dimensional plane in a widely spread hexagonal honeycomb shape It is characterized by forming a crystal structure, and the graphene exists as a physically and chemically stable structure as a film consisting of a thickness of one atom (about 0.2 nm). The graphene has very high malleability, electron mobility, high thermal conductivity, large Young coefficient, and a large theoretical specific surface area. In addition, the graphene conducts electricity more than 100 times better than copper, can move electrons more than 100 times faster than single crystal silicon, which is a semiconductor, has strength more than 200 times stronger than steel, and has thermal conductivity more than twice that of diamond. It has excellent elasticity and does not lose its electrical properties even when stretched or bent. Graphene fiber, which is a fiber containing graphene, has good blendability with fibers of various properties such as natural fibers and artificial fibers, depending on the purpose and performance of use, and is known to have excellent antibacterial, insect repellent, antistatic, and far-infrared ray performance. there is. The viscose fiber, also called artificial silk, is a naturally-derived fiber having a linear long fiber form. Among wood pulp, caustic soda and carbon disulfide are applied to soluble pulp, which is high in α-cellulose, to make a highly viscous viscose solution. It is manufactured by injecting the solution through a thin nozzle and combining it with cellulose molecules again, and it has a soft touch and good absorbency. In addition, the polyester fiber is a synthetic fiber obtained by spinning a polyester such as a condensation polymer of terephthalic acid and ethylene glycol, and has strength when pulled next to nylon and strength when wet. There is no change, and in particular, its wrinkle recovery rate is about the same as that of wool, and its recovery rate when wet is higher, and it has weak hygroscopicity and almost no elasticity.

In the present invention, excellent flame retardancy can be imparted to a nonwoven fabric by using graphene viscose fibers, which are a type of graphene fibers containing graphene, as a main fiber.

In the present invention, the fiber A is graphene polyester fiber, graphene polyester hollow fiber, graphene nylon fiber, flame retardant viscose fiber, As any one selected from the group consisting of flame retardant polyester fibers and flame retardant polypropylene fibers, the present invention further enhances the flame retardancy of the nonwoven fabric by using the fiber A and at the same time has higher heat retention. The graphene polyester fiber, graphene polyester hollow fiber and graphene nylon fiber are types of graphene fibers containing graphene in polyester fiber, polyester hollow fiber and nylon fiber, respectively, and the flame retardant viscose fiber, flame retardant Polyester fibers and flame retardant polypropylene fibers refer to viscose fibers, polyester fibers, and polypropylene fibers each subjected to flame retardant treatment with a phosphorus-based, nitrogen-based, or silica-based flame retardant.

In the present invention, the fiber A may be made of a single type of fiber having the same average fiber length and fineness, but the average fiber length is It is preferable that fiber A having a fineness of 25 to 40 mm and a fineness of 1 to 2 denier and fiber A having an average fiber length of 50 to 70 mm and a fineness of 2 to 5 denier are mixed in a weight ratio of 1:0.2 to 1:0.6. do.

In the present invention, the content of the fiber A is not particularly limited, but is preferably 10 to 40 parts by weight based on 100 parts by weight of the graphene viscose fiber. This is a problem in that when the content of the fiber A is less than 10 parts by weight relative to 100 parts by weight of the graphene viscose fiber, a sufficient increase in flame retardancy cannot be expected when mixed with the graphene viscose fiber, and if it exceeds 40 parts by weight, the price This is because the increase in flame retardant performance is insignificant compared to the excessive increase.

In the present invention, when the low-melting polyester fiber is mixed with the main fiber and the graphene fiber, it forms a nonwoven fabric with a voluminous feel similar to that filled with cotton, and at the same time, the adhesive force acts to maintain the volume of the nonwoven fabric for a long time As it serves to ensure that, the melting point is 110 to 200 ℃. The content of the low-melting polyester fiber is preferably 5 to 20 parts by weight based on 100 parts by weight of the main fiber. This is because when the content of the low-melting polyester fiber is less than 5 parts by weight with respect to 100 parts by weight of the main fiber, the volume feeling of the nonwoven fabric with a feeling similar to that filled with cotton does not last long, and the volume feeling is turned off even after a short period of use. Ultimately, there is a problem in that the quality of the product is significantly deteriorated, and when the amount exceeds 20 parts by weight, the surface texture of the nonwoven fabric becomes very rough and hard, and there is a problem in that coarse particles have a clumped feel.

Another aspect of the present invention relates to a method for producing a flame retardant nonwoven fabric, and more specifically, (a) mixing graphene viscose fiber, fiber A and low melting polyester fiber, wherein the fiber A is graphene polyester fiber, graphene Polyester hollow fiber, graphene nylon fiber, flame retardant viscose fiber, It is any one selected from the group consisting of flame retardant polyester fibers and flame retardant polypropylene fibers, and 10 to 40 parts by weight of the fiber A and 5 to 20 parts by weight of the low melting point polyester fiber are mixed with 100 parts by weight of the graphene viscose fiber. to prepare raw cotton; (b) performing a carding process on the raw cotton fabric prepared in step (a); (c) performing a multi-layer molding process on the raw material cotton passed through step (b); (d) performing a punching process of compressing the upper and lower parts of the raw cotton that has passed through step (c); and (e) preparing a nonwoven fabric by drying the raw cotton that has passed through step (d).

In the step (a), the fiber A may be made of a single type of fiber having the same average fiber length and fineness, but the average fiber to further increase flame retardancy, express higher heat retention, and have higher tensile strength Fiber A with a length of 25 to 40 mm and a fineness of 1 to 2 denier and fiber A with an average fiber length of 50 to 70 mm and a fineness of 2 to 5 denier are mixed in a weight ratio of 1:0.2 to 1:0.6 desirable.

The step (b) is a step of performing a carding process on the raw cotton fabric manufactured in step (a), wherein the carding process opens or , It is a process of removing impurities from fibers, stretching fibers to some extent, or making slivers, which can improve flame retardancy and mechanical properties of flame retardant nonwoven fabrics to be manufactured later. That is, the carding process is a process in which raw cotton is supplied to a carding machine, and is delicately opened while receiving mutual combing action to detach in the form of a thin spider web, that is, to separate the fibers included in the raw cotton one by one. .

The step (c) is a step of performing a multi-layer forming process on the raw material cotton that has undergone the carding process in step (b), and the forming process is a web forming process for the raw material cotton that has undergone the carding process. , the raw material cotton that has gone through the cutting process is in a thin web state, and since the single layer state is too thin, the process of stacking the raw material cotton in a thin web state so that the required number of layers are overlapped according to the thickness and width of the product am.

The step (d) is a step of performing a punching process of compressing the upper and lower parts of the raw cotton that has undergone the molding process in step (c), and the raw cotton that has undergone the molding process is formed into individual individual fibers in a formed web state. Since the fibers are not firmly bound to each other and are piled up in a natural state, the punching process punches the upper and lower parts to adjust the tensile strength, elongation and thickness of the flame retardant nonwoven fabric of the present invention to tangle the individual fiber strands together It is a process of making and binding. The punching process may be performed under punching process conditions commonly applied in the same technical field. For example, a punching machine with a needle is punched at 540 to 660 RPM for 30 to 60 seconds to compress the lower portion of the raw cotton. And, the upper part of the raw cotton can be compressed by punching the upper part of the raw cotton for 30 to 60 seconds at 540 to 660 RPM.

Finally, the step (e) is a step of manufacturing a nonwoven fabric by drying the raw cotton that has gone through the punching process of the step (d), and the drying can be performed at a temperature of 120 to 200 ° C for 2 to 15 minutes. However, in order to make the volume of the nonwoven fabric according to the present invention more taut and to keep the formed volume continuously and firmly, it is dried at 120 to 150 ° C. for the initial 1 to 5 minutes, and 15 seconds to 3 After cooling for 1 minute, it is preferable to further increase the drying temperature for another 1 to 5 minutes to dry at 150 to 180°C.

The flame retardant nonwoven fabric according to the present invention has excellent flame retardancy, so even if a fire occurs, it is not easily incinerated, which has the advantage of preventing damage to life and property.

In addition, the flame retardant nonwoven fabric according to the present invention has excellent heat retention, so that bedding or clothing with enhanced heat retention can be manufactured.

In addition, the flame retardant nonwoven fabric according to the present invention can maintain the volume of the initial state as much as possible even if stress is accumulated as the user repeatedly lies down or sits for a long period of time, so that the quality of the product can be maintained for a long time in terms of functionality and appearance.

In addition, the flame retardant nonwoven fabric according to the present invention has the advantage of having higher strength than conventional flame retardant nonwoven fabrics having the same thickness and width.

The flame retardant nonwoven fabric according to the present invention has a variety of uses, and can be used, for example, for bedding such as mattresses, clothing, and the like.

Hereinafter, the present invention will be described through examples. The following examples are only examples for explaining the present invention, and the scope of the present invention is not limited thereby.

Example: Preparation of flame retardant nonwoven fabric

Raw material cotton was prepared by mixing graphene viscose fiber, fiber A, and low melting point polyester fiber in the contents shown in Tables 1 and 2 below. The prepared cotton raw material was put into a carding machine to perform a carding process, and then put into a forming machine to perform a molding process of laminating raw cotton. For the raw material cotton after the molding process, the lower part of the raw material cotton is compressed by punching the lower part of the raw material cotton for 50 seconds at 580 RPM using a punching machine with a needle, and the upper part of the raw material cotton is also punched at 580 RPM for 350 seconds. A punching process was performed to compress the top of the cotton. The raw material cotton that had gone through the punching process was dried under the conditions shown in Tables 1 and 2 below to prepare a nonwoven fabric.

For reference, in Table 2 below, composite species means that two types of fibers are mixed in a ratio of 1: 0.5 based on weight (for example, in the case of "1.5D × 35mm, 3D × 51mm", the fineness is 1.5 denier ( D) and fibers with an average fiber length of 35 mm and fibers with a fineness of 3 denier (D) and an average fiber length of 51 mm are mixed in a weight ratio of 1:0.5).

graphene
viscose fiber
(4.5D × 60mm)
Fiber A (single species)
dry
condition graphene polyester fiber
(3D × 51 mm) graphene poly
ester hollow fiber
(3D × 64mm) graphene nylon fiber
(1.2D × 38mm) Flame Retardant
viscose
fiber
(3D × 55 mm) Flame Retardant
Poly
ester
fiber
(3D × 55 mm) Flame Retardant
Poly
propylene
fiber
(3D × 58 mm)
low melting point poly
ester
(4.5D)


A

B Example 1 100g 20g 10g ○ Example 2 100g 20g 10g ○ Example 3 100g 20g 10g ○ Example 4 100g 20g 10g ○ Example 5 100g 20g 10g ○ Example 6 100g 20g 10g ○

※ Drying condition A: drying at 150℃ for 8 minutes

※ Drying condition B: drying at 130 ℃ for the first 4 minutes, cooling for 2 minutes, and drying at 160 ℃ for another 4 minutes

graphene
viscose fiber
(4.5D × 60mm)
Fiber A (composite species) dry
condition graphene polyester fiber
(1.5D × 35mm,
3D × 51 mm) graphene poly
ester hollow fiber
(1.5D × 38mm,
3D × 64 mm) graphene nylon fiber
(1.2D × 38mm,
2.5D × 64mm) Flame Retardant
viscose
fiber
(1.5D × 36mm,
3D × 55 mm) Flame Retardant
Poly
ester
fiber
(1.5D × 36mm,
3D × 55 mm) Flame Retardant
Poly
propylene
fiber
(1.5D × 35mm,
3D × 58 mm) low melting point poly
ester
(4.5D)

A

B Example 7 100g 20g 10g ○ Example 8 100g 20g 10g ○ Example 9 100g 20g 10g ○ Example 10 100g 20g 10g ○ Example 11 100g 20g 10g ○ Example 12 100g 20g 10g ○

※ Drying condition A: drying at 150℃ for 8 minutes

※ Drying condition B: drying at 130 ℃ for the first 4 minutes, cooling for 2 minutes, and drying at 160 ℃ for another 4 minutes

Comparative Example: Preparation of flame retardant nonwoven fabric

100 g of flame retardant viscose fiber with an average fiber length of 60 mm and a fineness of 4.5 denier (D), 20 g of polyester fiber with a fineness of 4.5 denier (D) and 10 g of low-melting polyester fiber with a fineness of 4.5 denier (D) were mixed. Raw cotton was prepared. The prepared cotton raw material was put into a carding machine to perform a carding process, and then put into a forming machine to perform a molding process of laminating raw cotton. For the raw material cotton after the molding process, the lower part of the raw material cotton is compressed by punching the lower part of the raw material cotton for 50 seconds at 580 RPM using a punching machine with a needle, and the upper part of the raw material cotton is also punched at 580 RPM for 350 seconds. A punching process was performed to compress the top of the cotton. A nonwoven fabric was prepared by drying the cotton raw material subjected to the punching process at 150° C. for 8 minutes.

Experimental example

1. Flame retardant

For Examples 1 to 12 and Comparative Example, flame retardant performance was tested using a limited oxygen index (LOI) method based on KS M3032 standard, and the test results are shown in Table 3 below.

LOI Example 1 29 Example 2 31 Example 3 31 Example 4 30 Example 5 29 Example 6 29 Example 7 32 Example 8 32 Example 9 32 Example 10 33 Example 11 31 Example 12 31 comparative example 28

As can be seen from Table 3, it can be seen that Examples 1 to 12 according to the present invention generally have excellent flame retardant performance compared to Comparative Examples. In particular, nonwoven fabrics using composite type fibers A in which fibers A having different average fiber lengths and finenesses are mixed (Examples 7 to 12) have higher flame retardant performance than nonwoven fabrics using a single type of fiber A (Examples 1 to 6). It can be seen that it is relatively better.

2. Warmth

For Examples 1 to 12 and Comparative Examples, samples (30 cm × 30 cm) of Examples 1 to 12 and Comparative Examples were prepared in order to test heat retention, and kept warm in accordance with KS K 0560 standards and KS K 0466 standards The rate was measured, and the results are shown in Table 4 below.

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 comparative example warmth 74 74 73 72 72 71 79 79 78 75 75 75 66

As can be seen in Table 4, Examples 1 to 12 according to the present invention are generally superior in heat preservation compared to Comparative Examples, and in particular, in the case of Examples 7 to 12 using a composite fiber A, a single type of It can be seen that the heat retaining property is higher than that of Examples 1 to 6 using the fiber A.

3. Sustainability of non-woven fabric volume

For Examples 1 to 12 and Comparative Example, the degree of tightness of the sense of volume and the degree of persistence of the sense of tight volume were tested. The test method is to first confirm the degree of tightness of the sense of volume before the compression test, and then repeatedly apply compression to each of the nonwoven fabrics 10,000 times at a compression rate of 60% and 5 Hz using a compression tester, and then measure the degree of tightness of the sense of volume. It was visually evaluated (very tight: 5 points, tight: 4 points, normal: 3 points, bad: 2 points, very bad: 1 point). The test results are as shown in Table 5 below.

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 comparative example compression
before test
The tightness of the volume 4 4 5 5 5 5 4 4 5 5 5 5 3 compression
after the test
The tightness of the volume 3 4 4 4 4 4 3 3 5 4 4 4 2

As can be seen in Table 5, it can be seen that Examples 1 to 12 according to the present invention are generally superior in the degree of tightness of the sense of volume compared to Comparative Examples, and also excellent in the durability of the sense of tightness. In particular, Examples 3 to 6 and Examples 9 to 12 to which the drying condition B was applied had a relatively higher degree of tightness than Examples 1 and 2 and Examples 7 and 8 to which the drying condition A was applied, and the taut volume It can be confirmed that the persistence of persimmon is also better.

3. Tensile strength and weight

For each of the nonwoven fabrics of Examples 1 to 12 and Comparative Example, tensile strength in the machine direction (MD) and the width direction (CD) was measured according to the KSK 0520 test standard. The measurement results of tensile strength are as shown in Table 6 below.

Machine direction (MD)
Tensile strength (kg/5 cm) Widthwise (CD)
Tensile strength (kg/5 cm) Example 1 77 76 Example 2 79 77 Example 3 80 79 Example 4 79 78 Example 5 79 78 Example 6 78 76 Example 7 83 82 Example 8 84 82 Example 9 85 83 Example 10 85 84 Example 11 85 84 Example 12 84 83 comparative example 63 62

As can be seen in Table 6, Examples 1 to 12 according to the present invention can be confirmed that the tensile strength is higher than that of the comparative example, the flame retardant nonwoven fabric according to the present invention has a higher tensile strength than the conventional flame retardant nonwoven fabric you can know what you have In particular, it can be seen that in the case of Examples 7 to 12 using the composite fiber A, the tensile strength is relatively higher than that of Examples 1 to 6 using the single fiber A.

As described above, those skilled in the art to which the present invention pertains will be able to understand that the present invention can be embodied in other specific forms without changing its technical spirit or essential features. The scope of the present invention is indicated by the claims to be described later rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts are interpreted to be included in the scope of the present invention. It should be.

Claims (5)

Including graphene viscose fiber, fiber A and low melting point polyester fiber,
The fiber A is any one selected from the group consisting of graphene polyester fiber, graphene polyester hollow fiber, graphene nylon fiber, flame retardant viscose fiber , flame retardant polyester fiber and flame retardant polypropylene fiber,
A flame retardant nonwoven fabric containing 10 to 40 parts by weight of the fiber A and 5 to 20 parts by weight of the low melting point polyester fiber, based on 100 parts by weight of the graphene viscose fiber.
According to claim 1,
The fiber A has an average fiber length of 25 to 40 mm and a fineness of 1 to 2 denier, and fiber A has an average fiber length of 50 to 70 mm and a fineness of 2 to 5 denier in a weight ratio of 1:0.2 to 1:0.6 A flame retardant nonwoven fabric, characterized in that it is mixed in a ratio.
(a) mixing graphene viscose fiber, fiber A and low melting point polyester fiber, wherein the fiber A is graphene polyester fiber, graphene polyester hollow fiber, graphene nylon fiber, flame retardant viscose fiber, It is any one selected from the group consisting of flame retardant polyester fibers and flame retardant polypropylene fibers, and 10 to 40 parts by weight of the fiber A and 5 to 20 parts by weight of the low melting point polyester fiber are mixed with 100 parts by weight of the graphene viscose fiber. to prepare raw cotton;
(b) performing a carding process on the raw cotton fabric prepared in step (a);
(c) performing a multi-layer molding process on the raw material cotton passed through step (b);
(d) performing a punching process of compressing the upper and lower parts of the raw cotton that has passed through step (c); and
(e) preparing a non-woven fabric by drying the raw material cotton that has passed through step (d);
According to claim 3,
The fiber A has an average fiber length of 25 to 40 mm and a fineness of 1 to 2 denier, and fiber A has an average fiber length of 50 to 70 mm and a fineness of 2 to 5 denier in a weight ratio of 1:0.2 to 1:0.6 A method for producing a flame retardant nonwoven fabric, characterized in that it is mixed in a ratio.
According to claim 3,
The drying in step (e) is performed at 120 to 150° C. for the initial 1 to 5 minutes, cooled for 15 seconds to 3 minutes, and then dried at 150 to 180° C. by increasing the drying temperature for another 1 to 5 minutes. Method for producing a flame retardant nonwoven fabric, characterized in that to.