KR101980312B1 - flame-retardant nonwoven fabric for mattress and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a flame-retardant non-woven fabric for a mattress and a production method thereof and, more specifically, to a flame-retardant non-woven fabric for a mattress which can reduce the combustion rate generated when the fire occurs in the mattress and the incidence of exhaust gas generated when the mattress is combusted to the minimum, and to a production method thereof.

Description

FIELD OF THE INVENTION The present invention relates to flame-retardant nonwoven fabrics for mattresses,

The present invention relates to a flame-retardant nonwoven fabric for a mattress and a method of manufacturing the flame-retardant nonwoven fabric for a mattress, and more particularly to a flame-retardant nonwoven fabric for a mattress which can reduce a combustion rate when a fire occurs and a generation rate of soot generated upon combustion, .

In general, the cotton used in the production of various bedding is classified into animal wool, cotton wool, cotton wool, vegetable fiber, cottonwood, and chemical fiber using polyester fiber. Polyester fiber is widely used as a nonwoven fabric by resin coating . In order to make various duvets and pads using the cotton of the above-mentioned type, the cotton is laminated on a general fabric, and the product is made from a quilted fabric.

Generally, a mattress is placed on a bed frame that constitutes a bed used in each home, and is used when a person is comfortable sleeping and resting. A mattress currently used has a cover on the outer circumference of a tension element having its own tension force The member is covered. The cover member may be made of a nonwoven fabric, a padding pad, a felt, a fabric or the like alone or in combination so as to produce a cover member integrated with the known leaning method and cover the cover member on the outer peripheral surface of the tension element.

Such a conventional mattress is used by a person directly lying down or lying down. The tension element only studies the function of the tension force, and the cover member which is covered on the outer circumferential surface of the tension element is directly contacted with the body of the person , It is only the function of antibacterial, sterilization, and deodorization, and there is no inconvenience and problem at the time of use. However, when a fire occurs in the house due to an unexpected accident during use and the flame is ignited on the mattress, The cover member is easily burned and poisonous gas harmful to the human body is generated at the time of incineration, resulting in greater fire and personal injury.

Korean Published Patent No. 2012-0108629 (published on October 10, 2012)

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a flame retardant nonwoven fabric for a mattress which has excellent flame retardancy and a method for producing the same.

The present invention also relates to a flame retardant nonwoven fabric for a mattress which has flame retardancy and mechanical properties suitable for use as a nonwoven fabric for a mattress, and a method for producing the same.

In order to solve the above-mentioned problems, the flame retardant nonwoven fabric for a mattress of the present invention may include cellulosic flame-retardant fiber, low melting point PET fiber and PET flame retardant fiber.

As a preferred embodiment of the present invention, the flame retardant nonwoven fabric for a mattress of the present invention may contain 5 to 15 parts by weight of low melting point PET fibers and 20 to 40 parts by weight of PET flame retardant fibers per 100 parts by weight of cellulose flame retardant fibers .

As a preferred embodiment of the present invention, the cellulose flame retardant fiber may include a compound represented by the following formula (1).

[Chemical Formula 1]

Wherein R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , R ₆ , R ₇ , R ₈ , R ₉ , R ₁₀ , R ₁₁ and R ₁₂ each independently represent a hydrogen atom or a C1- C5 < / RTI >

In one preferred embodiment of the present invention, the cellulose flame retardant fiber has a fineness of 2 to 6 denier, a fiber length of 40 to 70 mm, a flash point of 414 to 506 캜, a density of 1.35 to 1.65 g / cm ³ at a temperature of 20 캜 , And a thermal decomposition temperature of 175 ° C or higher.

In one preferred embodiment of the present invention, the low melting point PET fiber may have a fineness of 2 to 6 denier, a fiber length of 40 to 70 mm, a melting point of 110 to 252 ° C, and a specific gravity of 1.24 to 1.52 g / cm ³ .

In one preferred embodiment of the present invention, the PET flame retardant fiber may include a compound represented by the following formula (2).

(2)

In Formula 2, A represents -CH ₂ -, -CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ CH ₂ -, or -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ -.

In one preferred embodiment of the present invention, the PET flame retardant fiber has a fineness of 3 to 7 denier, a fiber length of 40 to 70 mm, a glass transition temperature of 65 to 70 캜, a melting point of 250 to 255 캜, a melting point of 1.24 to 1.52 g / cm ^{3. &} Lt; / RTI >

Meanwhile, a method for producing a flame-retardant nonwoven fabric for a mattress includes a first step of preparing a raw cotton yarn by mixing 5 to 15 parts by weight of a low-melting-point PET fiber and 20 to 40 parts by weight of a PET flame-retardant fiber with respect to 100 parts by weight of cellulose- A second step of performing a carding process on the raw cotton, a third step of forming a multi-layered laminate on the raw cotton material subjected to the carding process, A fourth step of performing a punching process of compressing the raw cotton yarn and a fifth step of drying the raw cotton subjected to the punching process to produce a nonwoven fabric.

In one preferred embodiment of the present invention, the raw cotton material subjected to the molding process has a weight of 10-20 oz / m 2, and the raw material cotton subjected to the punching process may have a weight of 10-20 oz / m 2.

In one preferred embodiment of the present invention, the punching process is performed at 480 to 720 RPM for 30 to 120 seconds to compress the lower portion of the raw cotton, and the raw cotton is compressed at 480 to 720 RPM for 30 to 120 seconds to compress the upper portion of the raw cotton .

On the other hand, the types of nonwoven fabric may vary, but the nonwoven fabric of the present invention can be used for a mattress in the art and may include various nonwoven fabrics having flame retardancy.

The nonwoven fabric of the present invention may be a directional nonwoven fabric, padding cotton, padding, synthetic fiber, wadding or felt, preferably padding cotton or felt.

The flame retardant nonwoven fabric for a mattress and the method for producing the same of the present invention have excellent flame retardancy and excellent mechanical properties.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

The flame retardant nonwoven fabric for a mattress of the present invention includes cellulosic flame-retardant fiber, low-melting PET (polyethylene terephthalate) fiber and PET (polyethylene terephthalate) flame retardant fiber.

First, the cellulosic flame-retardant fiber of the present invention is a fiber having cellulose as a main component and having excellent flame retardancy including a flame retardant component, preferably natural cellulose flame retardant fiber have.

The cellulose flame retardant fiber of the present invention may contain a compound represented by the following formula (1) as a flame retardant component, and the flame retardancy of the flame retardant nonwoven fabric for a mattress of the present invention may significantly increase have.

[Chemical Formula 1]

Wherein R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , R ₆ , R ₇ , R ₈ , R ₉ , R ₁₀ , R ₁₁ and R ₁₂ each independently represent a hydrogen atom or a C1- may be an alkyl group of C5, preferably _{R 1, R 2, R 3} , R 4, R 5, R 6, R 7, R 8, R 9, R 10, R 11 and R ₁₂ are each independently hydrogen, may be an atom or an alkyl group of C1 ~ C3, more preferably _{R 1, R 2, R 5} , R 6, R 7, R 8, R 11 and R ₁₂ is a hydrogen _{atom, R 3, R 4, R} 9 , And R < ₁₀ > may be a methyl group.

The cellulose flame retardant fiber of the present invention may contain 5% by weight or less, preferably 0.1 to 4% by weight, more preferably 1 to 3% by weight of the compound represented by the formula (1) Is contained in an amount exceeding 5% by weight, the mechanical properties of the cellulose flame retardant fiber may be significantly deteriorated.

Meanwhile, the cellulose flame retardant fiber of the present invention may have a flash point of 360 to 560 ° C, preferably an ignition temperature of 414 to 506 ° C, and more preferably a flash point of 430 to 490 ° C. In addition, the cellulosic flame retardant fiber of the present invention may have a density of 1.35 to 1.65 g / cm ³ , preferably 1.42 to 1.58 g / cm ³ at a temperature of 20 ° C. In addition, the cellulosic flame retardant fibers of the present invention may have a thermal decomposition temperature of at least 150 캜, preferably a thermal decomposition temperature of at least 175 캜.

The cellulose flame retardant fiber of the present invention may have a fineness of 2 to 6 denier, preferably 3 to 5 denier, more preferably 4 to 5 denier, and if the fineness is less than 2 denier There may be a problem that the surface of the nonwoven fabric is not uniform during lamination, and if it exceeds 6 denier, there is a problem that the nonwoven fabric has poor bulkiness.

The cellulosic flame retardant fiber of the present invention may have a fiber length of 40 to 70 mm, preferably 45 to 65 mm, more preferably 50 to 60 mm. If the fiber length is less than 40 mm, There may be difficulty in fiber formation because there is no entanglement at the time, and if it exceeds 70 mm, it may not be easily removed from the card machine at the time of manufacturing, which may be difficult to commercialize.

Next, the low melting point PET fiber of the present invention may be a PET fiber having a melting point of 110 to 252 DEG C, preferably a melting point of 120 to 180 DEG C. The low melting point PET fiber of the present invention may have a specific gravity of 1.24 to 1.52 g / cm ³ , more preferably 1.17 to 1.45 g / cm ³ .

On the other hand, the flame retardant nonwoven fabric for a mattress of the present invention contains 5 to 15 parts by weight, preferably 7 to 13 parts by weight, and more preferably 8 to 12 parts by weight of low melting point PET fibers per 100 parts by weight of the cellulose flame retardant fiber If the low melting point PET fiber is contained in an amount of less than 5 parts by weight, there is a problem of unbalance in combination of cellulose flame retardant fiber and PET flame retardant fiber, and there may be a problem that tensile strength and flame retardant performance are lowered. If the amount exceeds the above range, there is a problem that efficiency may be a problem because drying time is much needed, and there is a problem that the elongation and flame retardant performance are deteriorated.

The low melting point PET fiber of the present invention may have a fineness of 2 to 6 denier, preferably 3 to 5 denier, more preferably 4 to 5 denier. If the fineness is less than 2 denier, There may be a problem that the surface is not evenly distributed at the time of use, and if it exceeds 6 denier, there is a problem that the efficiency is inferior because it takes a lot of time at the time of drying.

The low melting point PET fiber of the present invention may have a fiber length of 40 to 70 mm, preferably 45 to 65 mm, more preferably 50 to 60 mm. If the fiber length is less than 40 mm, There may be difficulty in fiber formation. If it exceeds 70 mm, it may be difficult to produce a product because it does not come out from the card machine at the time of manufacture.

Next, the PET flame retardant fiber of the present invention contains PET as a main component and includes a flame retardant component and has excellent flame retardancy, and may include a compound represented by the following formula (2) as a flame retardant component.

(2)

In Formula 2, A represents -CH ₂ -, -CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ CH ₂ -, or -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ -, preferably -CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ -, or -CH ₂ CH ₂ CH ₂ CH ₂ -.

In addition, the PET flame retardant fiber of the present invention may have a glass transition temperature of 60 to 75 占 폚, preferably 65 to 70 占 폚. In addition, the PET flame retardant fiber of the present invention may have a melting point of 240 to 265 DEG C, preferably a melting point of 250 to 255 DEG C. In addition, the PET flame retardant fiber of the present invention may have a specific gravity of 1.24 to 1.52 g / cm ³ , more preferably 1.17 to 1.45 g / cm ³ .

On the other hand, the flame retardant nonwoven fabric for a mattress according to the present invention comprises 20 to 40 parts by weight, preferably 25 to 35 parts by weight, more preferably 27 to 33 parts by weight of PET flame retardant fibers per 100 parts by weight of the cellulose flame retardant fiber If the PET flame retardant fiber is contained in an amount of less than 20 parts by weight, there may be a problem of poor workability, a problem of deterioration of tensile strength and flame retardancy, and if it exceeds 40 parts by weight, There may be a problem that the characteristics are not displayed well, and there may be a problem that tensile strength and elongation are lowered.

The PET flame retardant fiber of the present invention may have a fineness of 3 to 7 denier, preferably 4 to 6 denier, more preferably 5 to 6 denier. If the fineness is less than 3 denier, There may be a problem that it is difficult to harmonize with the cellulose flame retardant fiber, and if it exceeds 7 denier, the nonwoven fabric may have poor heat retention and flexibility.

The PET flame retardant fiber of the present invention may have a fiber length of 40 to 70 mm, preferably 45 to 65 mm, more preferably 50 to 60 mm. If the fiber length is less than 40 mm, There may be a problem of fiber formation difficulty because there is no entanglement, and if it exceeds 70 mm, it may not be easily removed from the card machine at the time of manufacturing, which may be difficult to commercialize.

On the other hand, the flame-retardant nonwoven fabric for a mattress of the present invention can satisfy the following conditions (1) and (2).

(1) Fineness of cellulose flame retardant fiber <Fineness of PET flame retardant fiber

(2) Fineness of low melting point PET fiber <Fineness of PET flame retardant fiber

If the conditions (1) and (2) are not satisfied, there may be a problem that the flame retardancy of the flame retardant nonwoven fabric for a mattress of the present invention is deteriorated.

Meanwhile, the flame retardant nonwoven fabric for a mattress of the present invention has a flame retardant performance of 28 to 35, preferably 30 to 33, as measured by a limited oxygen index (LOI) method according to the KS M3032 specification have.

The flame retardant nonwoven fabric for a mattress according to the present invention has a tensile strength of 68 to 75 kg / 5 cm, preferably 70 to 74 kg / 5 cm, a tensile strength of TD ( A tensile strength of 40 to 50 kg / 5 cm, preferably a tensile strength of 45 to 48 kg / 5 cm in the transverse direction.

The flame retardant nonwoven fabric for a mattress according to the present invention has an elongation of 56 to 70%, preferably an elongation of 60 to 68% in TD (transverse direction) direction And may have an elongation of 60 to 75%, preferably an elongation of 65 to 73%.

The method for manufacturing a flame-retardant nonwoven fabric for a mattress of the present invention includes the first to fifth steps.

First, in the first step of the method for producing a flame-retardant nonwoven fabric for a mattress of the present invention, raw cotton can be prepared by mixing cellulose flame retardant fiber, low melting point PET fiber and PET flame retardant fiber.

In this case, the raw cotton may be blended with 5 to 15 parts by weight, preferably 7 to 13 parts by weight, more preferably 8 to 12 parts by weight, of the low melting point PET fiber per 100 parts by weight of the cellulose flame retardant fiber And 20 to 40 parts by weight, preferably 25 to 35 parts by weight, and more preferably 27 to 33 parts by weight of the PET flame retarded fiber.

Next, in the second step of the flame-retardant nonwoven fabric for a mattress according to the present invention, a carding process may be performed on the raw cotton produced in the first step.

The carding process may be carried out by opening the tangled fibers constituting the raw cotton to one by one until separation, removing impurities, entanglement, staple fibers, neps or the like in the fibers, stretching the fibers to some extent, And is a process capable of improving flame retardancy and mechanical properties of a flame retardant nonwoven fabric for a mattress to be produced later. In other words, in the carding process, the raw cotton is fed to the carding machine, and the web is delicately opened while being subjected to the combing action, thereby separating the fibers contained in the raw cotton yarn in a web form in a thin web state .

Specifically, the carding process of the present invention can be carried out in two steps, and the raw cotton is first combed using a card machine (flat card, roller card, etc.) The raw cotton can be further combed by a card machine (flat card, roller card, etc.) to produce a completely combed raw cotton.

Next, in the third step of the method for producing a flame-retardant nonwoven fabric for a mattress of the present invention, it is possible to carry out a forming process of laminating a plurality of layers of the raw cotton yarn on which the carding process of the second step has been performed.

The forming process is a web forming process of a raw cotton material subjected to a carding process. The raw cotton material subjected to the carving process is in a state of one layer of a thin web, and the single layer is too thin. Therefore, And a thin web web of raw material is laminated so as to overlap the necessary number of layers.

As mentioned above, as described above, the flocked nonwoven fabric for a mattress is not limited to a certain thickness or weight, but is preferably 10 to 20 oz / Lt; 2 &gt;, more preferably from 13 to 17 oz / m &lt; 2 &gt;.

Next, in the fourth step of the method for producing a flame retardant nonwoven fabric for a mattress of the present invention, a punching process of compressing the upper and lower portions of the raw cotton yarn in which the forming process of the third step is performed may be performed.

Since the raw cotton yarn in which the forming process has been performed is in a state in which the individual fibers of the formed web state are not firmly bonded to each other and are piled up in a natural state, the punching process can be carried out by using the flame retardant nonwoven fabric for a mattress, And punching the upper and lower portions to adjust the elongation and thickness, thereby binding the individual fiber strands together.

Specifically, the punching process is performed by punching the lower part of the raw cotton through a punching machine with a needle for 30 to 120 seconds, preferably 30 to 60 seconds at 480 to 720 RPM, preferably 540 to 660 RPM, And the upper portion of the raw cotton can be compressed by punching the upper portion of the raw cotton for 4 to 80 seconds, preferably 540 to 660 rpm for 30 to 120 seconds, preferably 30 to 60 seconds.

Since the thickness and the weight of the raw cotton material subjected to the punching process are determined depending on the product to which the final flame retardant nonwoven fabric for a mattress is used, it is not limited to a certain thickness or weight, but preferably is a basis weight of 10 to 20 oz / , More preferably from 13 to 17 oz / m &lt; 2 &gt;.

Lastly, in the fifth step of the flame retardant nonwoven fabric for a mattress of the present invention, the raw cotton which has undergone the punching step of the fourth step may be dried to produce a nonwoven fabric.

The drying in the fifth step may be carried out at a temperature of 120 to 200 ° C, preferably at a temperature of 140 to 180 ° C, more preferably at a temperature of 150 to 170 ° C for 10 to 20 minutes, preferably 13 to 17 minutes have.

Meanwhile, the nonwoven fabric manufactured by the method for producing a flame retardant nonwoven fabric for a mattress of the present invention may be further subjected to a cooling process after drying.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various changes and modifications may be made without departing from the scope of the present invention. For example, each component specifically illustrated in the embodiments of the present invention can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Example 1: Production of flame retardant nonwoven fabric for mattress

(1) 100 g of cellulosic flame retardant fiber (Lenzing, lenzing FR) having a fineness of 3 denier and containing a compound represented by the following formula (1-1) and having a fineness of 3 denier and a melting point of 120 to 180 캜 10 g of low melting point PET fibers (Toray Co., EZBON-L), 30 g of PET flame retardant fiber (Huvis Co., FRF) containing a compound having a fineness of 6 and a compound represented by the following Chemical Formula 2-1 were added and mixed to prepare a raw cotton .

[Formula 1-1]

In the above formula _{1-1, R 1, R 2,} R 5, R 6, R 7, R 8, R 11 and R ₁₂ is a hydrogen _{atom, R 3, R 4, R} 9 and R ₁₀ is a methyl group .

[Formula 2-1]

In Formula 2-1, A is -CH ₂ CH ₂ -.

(2) The prepared raw cotton was put into a super cleaner, and the raw cotton was first combed, and the first combed raw cotton was put into a card machine to carry out a carding process to comb the second time.

(3) A molding process was performed in which the raw cotton material having been subjected to the carding process was put in a molding machine to laminate the raw cotton material.

(4) The raw material cotton having been subjected to the molding process was punched at a speed of 600 RPM for 45 seconds using a punching machine with a needle, and the upper portion of the raw material cotton was punched at 600 RPM for 45 seconds to produce 15 oz / A punching process for producing raw cotton having a basis weight was carried out.

(5) The raw cotton that had been punched was dried at a temperature of 160 캜 for 15 minutes to prepare a flame retardant nonwoven fabric for a mattress of the present invention.

Examples 2 to 9 and Comparative Examples 1 to 2: Production of flame-retardant nonwoven fabric for mattress

A flame-retardant nonwoven fabric for a mattress was prepared in the same manner as in Example 1. However, each of the nonwoven fabrics was prepared by varying the content of the fibers used for producing the raw cotton as shown in Table 1 below.

Example 10: Production of flame retardant nonwoven fabric for mattress

A flame-retardant nonwoven fabric for a mattress was prepared in the same manner as in Example 1. However, a flame retardant nonwoven fabric for a mattress was prepared using general cellulose flame retardant fibers not containing the compound represented by the formula (1-1) other than the cellulosic flame retardant fiber containing the compound represented by the formula (1-1).

Example 11: Manufacture of flame retardant nonwoven fabric for mattress

A flame-retardant nonwoven fabric for a mattress was prepared in the same manner as in Example 1. However, a flame-retardant nonwoven fabric for a mattress was prepared using general PET fibers not containing the compound represented by the formula (2-1), which is not a PET flame retardant fiber containing the compound represented by the formula (2-1).

Example 12: Manufacture of flame retardant nonwoven fabric for mattress

A flame-retardant nonwoven fabric for a mattress was prepared in the same manner as in Example 1. However, instead of the PET flame retardant fiber having a fineness of 6, a flame retardant nonwoven fabric for a mattress was produced using PET flame retardant fibers having a fineness of 3 denier.

Experimental Example 1

The following properties of the flame retardant nonwoven fabric for a mattress prepared by the above Examples and Comparative Examples were measured and are shown in Table 2 below.

1. Tensile strength and elongation

Ten specimens having a sample width of 5 cm and a sample length of 7.5 cm were measured by a United instrument manufactured by United States of America according to ASTM D1682-64 and the average tensile strength was measured individually at a tensile speed of 500 mm / And tensile strength was shown. The elongation at the maximum elongation was also determined.

2. Flame retardant performance

The flame retardant performance was measured by limiting oxygen index (LOI) method according to KS M3032.

As can be seen from Table 2, the nonwoven fabric prepared in Example 1 was superior in tensile strength and flame retardancy to the nonwoven fabric prepared in Example 2, and significantly superior in tensile strength and flame retardancy than the nonwoven fabric prepared in Example 3 I could confirm.

In addition, it was confirmed that the nonwoven fabric prepared in Example 1 was superior in elongation and flame retardancy to the nonwoven fabric prepared in Example 4, and that the stretch and flame retardancy were significantly superior to the nonwoven fabric prepared in Example 5.

In addition, it was confirmed that the nonwoven fabric prepared in Example 1 was superior in tensile strength and flame retardancy to the nonwoven fabric prepared in Example 6, and that the tensile strength and the flame retardancy were remarkably superior to those of the nonwoven fabric prepared in Example 7.

It was also confirmed that the nonwoven fabric prepared in Example 1 was superior in tensile strength and elongation to the nonwoven fabric prepared in Example 8, and was superior in tensile strength and elongation to the nonwoven fabric prepared in Example 9.

It was also confirmed that the nonwoven fabric prepared in Example 1 had significantly better flame retardancy than the nonwoven fabric prepared in Examples 10 and 11.

Further, it was confirmed that the nonwoven fabric prepared in Example 1 was superior in tensile strength and flame retardancy to the nonwoven fabric prepared in Example 12.

It was also confirmed that the nonwoven fabric prepared in Example 1 had significantly higher tensile strength and flame retardancy than the nonwoven fabric prepared in Comparative Examples 1 and 2.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

Cellulose fibers having a fineness of 2 to 6 denier, a fiber length of 40 to 70 mm, a firing point of 414 to 506 ° C, a density of 1.35 to 1.65 g / cm ³ at a temperature of 20 ° C and a thermal decomposition temperature of 175 ° C or more melting point PET fibers having a fineness of 2 to 6 denier, a fiber length of 40 to 70 mm, a melting point of 110 to 252 ° C and a specific gravity of 1.24 to 1.52 g / cm ³ , parts by weight and the fineness of 4-6 deniers, PET retardant fiber 20 and having a melting point, specific gravity of 1.24 ~ 1.52g / cm ³ of 40 ~ 70mm in the fiber sheet, the glass transition temperature of 65 ~ 70 ℃, 250 ~ 255 ℃ 40 parts by weight,
The flame retardant nonwoven fabric for a mattress according to claim 1, wherein the PET flame retardant fiber comprises a compound represented by the following formula (2).
(2)

In Formula 2, A represents -CH ₂ -, -CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ CH ₂ -, or -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ -.
delete The method according to claim 1,
The flame retardant nonwoven fabric for a mattress according to claim 1, wherein the cellulosic flame retardant fiber comprises a compound represented by the following formula (1).
[Chemical Formula 1]

Wherein R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , R ₆ , R ₇ , R ₈ , R ₉ , R ₁₀ , R ₁₁ and R ₁₂ each independently represent a hydrogen atom or a C1- C5 &lt; / RTI &gt;
delete delete delete delete 100 weight parts of cellulose flame retardant fiber having a fineness of 2 to 6 denier, a fiber length of 40 to 70 mm, a flash point of 414 to 506 캜, a density of 1.35 to 1.65 g / cm ³ at a temperature of 20 캜, and a thermal decomposition temperature of 175 캜 or more with respect to the section, a fineness of 2-6 deniers, fiber sheet of 40 ~ 70mm, melting point of 110 ~ 252 ℃, 1.24 ~ low-melting PET fibers having a specific gravity of 1.52g / cm ³ 5 ~ 15 parts by weight of 4-6 deniers 20 to 40 parts by weight of PET flame retardant fibers having a fineness of 40 to 70 mm, a glass transition temperature of 65 to 70 캜, a melting point of 250 to 255 캜 and a specific gravity of 1.24 to 1.52 g / cm ³ , ;
A second step of performing a carding process on the raw cotton;
A third step of performing a forming process of laminating a plurality of layers of raw cotton on the carding process;
A fourth step of performing a punching process of compressing the upper and lower portions of the raw cotton material subjected to the forming process; And
A fifth step of drying the raw cotton subjected to the punching process to produce a nonwoven fabric; Lt; / RTI &gt;
Wherein the PET flame retardant fiber comprises a compound represented by the following formula (2): &lt; EMI ID = 1.0 &gt;
(2)

In Formula 2, A represents -CH ₂ -, -CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ CH ₂ -, or -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ -.
9. The method of claim 8,
Wherein the raw cotton subjected to the punching process has a basis weight of 10 to 20 oz / m &lt; 2 &gt;.
10. The method of claim 9,
Wherein the punching step is performed at 480 to 720 RPM for 30 to 120 seconds to compress the lower part of the raw cotton and perform the pressing for 4 to 720 RPM for 30 to 120 seconds to compress the upper part of the raw cotton. Gt;