JPH09262170A - Cushion carpet and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carpet and its manufacturing method, with which the produced carpet has a deodorizing and moisture permeating nature, presents a comfortable sense of use, and is easy to be recycled. SOLUTION: A cushion carpet is structured so that pile fibers 1 are implanted in a base cloth 2 followed by sealing and that a cushioning material 4 is affixed to the rear surface of the base cloth 2. The cushioning material 4 is formed from two or more sorts of fibers including low melting point fiber A and deodorizing fiber B, wherein the melting point of the fiber A is lower by 50 deg.C or more than that of the lowest one of the fiber other than A constituting pile fiber, base cloth fiber, and cushioning material, and it should be arranged so that 20-60wt.% fiber A is contained in the cushioning material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushion carpet in which a deodorant cushion material is attached to a base cloth, and more specifically to a pile, a base cloth,
The present invention relates to a cushion carpet that facilitates recycling by using the same type of polymer for both a sealing material and a cushioning material having deodorant properties, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as a method for imparting deodorant properties, for example, a method using ascorbic acid and a divalent iron compound is disclosed in JP-A-61-296111, and a method for imparting a phthalocyanine copper compound is disclosed in JP-A-62-162. 6978, a method of kneading aluminum dihydrogen tripolyphosphate into a polyester polymer is JP-A-3-124809, and a method using a copolymer in which a vinyl carboxylate copper salt comonomer is copolymerized as copper ions is disclosed in JP-A-5-124809. No. 186901 is proposed. However, these deodorant products have problems such as a limited deodorizing range of odor components, coloring or high price, and they are used as they are. In recent years, carpet products having the above deodorant performance have been required, but none have been used for this purpose.

On the other hand, from the two needs of environmental protection of the earth and efficient use of resources, the problem of processing and reusing industrial waste and general household waste is becoming more and more important, and in many fields. , Many people are interested. However, in the field of carpets, most used carpets have been disposed of in landfills so far, and practical recycling technology for carpets is still in the development stage.

[0004] Generally, in order to obtain a quality suitable for the purpose of the carpet, tufted pile base fabric is piled with tufted pile yarns and card webs and nidle punched.
Front fibers such as woven and knitted fabrics, puncture base cloth on the back side, sealing layers,
Composed of a backing layer. The surface fiber determines the basic performance of the carpet. From the aspects of the required function and price of each product such as home, office, hotel, theater, car mat, store etc., various kinds of natural fiber, synthetic fiber etc. Fibers are selected and used. Natural tufts and polyester spunbonds are commonly used for tufted sashimi, and polyester spunbonds are the mainstream. The backing layer on the back side of the carpet is for home, office,
The required functions differ depending on the location and form of use, such as for automobiles, and the specifications are finely divided according to the product, such as the use of vinyl chloride or neoprene rubber that does not shift the layer, and the use of polyethylene that is easy to fix the form. Such a wide variety of materials and configurations make it difficult to put carpet into practical use. The roughly proposed recycling technologies are roughly classified into the following three.

The first is thermal recycling. It is a method of cutting a carpet into an appropriate form, burning it, and reusing it as in-house power generation and various types of heat energy. But,
This method is not preferable from the viewpoint of resource reuse.

The second is material recycling. This method differs from the following chemical recycling in that the pellets are physically and mechanically pelletized. When this recycled pellet is reused, it is divided into two cases. One is to develop a product as a new material in consideration of the fact that various materials are mixed, such as flower beds, pots for bonsai, and decorative piles for sidewalks. The other is disclosed in Japanese Unexamined Patent Publication Nos. Hei 5-212935 and Hei 6-123052.
In this case, it is composed of 0% of the same material, collected, pelletized, melted and reused.

The third is chemical recycling. The chemical recycling that best matches the basic concept of recycling is chemical recycling, which collects products, decomposes them, and returns them to their original raw materials. However, since carpets are used for a wide variety of products and the material configurations thereof are various, it takes some time to develop an economical depolymerization system. A means for solving this problem is disclosed in JP-A-5-117441.
No. 1993. As an auxiliary means for improving the efficiency of depolymerization, the carpet is fragmented, separated into small pieces containing nylon 6 which is a pile material and other small pieces by a separator, and the small pieces containing nylon 6 are supplied to a depolymerization system. This is a method of recovering ε-caprolactam as a raw material. However, even if the carpet is cut into small pieces and separated by mechanical means, for example, by the difference in specific gravity due to a cyclone,
The small pieces containing Nylon 6 still contain polyester spunbond for tufting base cloth, sealing layer, vinyl chloride for backing layer, neoprene rubber, polyethylene, etc., which can solve the difficulty of depolymerization purification. It has not been.

Furthermore, a carpet having both deodorant property and easy recycle property has not been disclosed.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cushion carpet which has a deodorant property, a moisture permeability, a comfortable feeling of use, and is easy to recycle, and a manufacturing method thereof.

[0010]

The cushion carpet of the present invention has the following constitution in order to solve the above problems.

That is, in a cushion carpet in which pile fibers are planted in a base cloth and sealed, and a cushion material is attached to the back surface of the base cloth, the cushion material includes two or more kinds of fibers having a low melting point fiber A and a deodorant fiber B. The melting point of the low melting point fiber A is 50 ° C. or more lower than the lowest melting point fiber other than the low melting point fiber A constituting the pile fiber, the base fabric fiber and the cushioning material, and the low melting point fiber A Is contained in the cushioning material in an amount of 20 to 60% by weight.

The cushion carpet manufacturing method of the present invention has the following construction.

That is, the low melting point fiber A and the deodorant fiber B
Of two or more kinds of fibers including, and forming a laminated web while mixing, opening and carding these fibers, the melting point of the low melting point fiber A or higher and the melting point of the fibers other than the low melting point fiber A are the highest. A cushion material is formed by heat-treating at a temperature lower than the melting point of the low melting point fiber, and further pile fibers are planted in a base cloth to form a carpet, and the cushion material is superposed on the back surface of the base cloth of the carpet to have a low melting point. A pile fiber, a base fabric fiber, and a cushioning material for pile fibers and a cushioning material by heat treatment at a temperature lower than the melting point of the fiber having the lowest melting point among the fibers other than the low melting point fiber A constituting the cushioning material, which is higher than the melting point of the fiber A. A method for producing a cushion carpet, which comprises bonding a base cloth.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the accompanying drawings with reference to the accompanying drawings.

One of the objects of the present invention is to impart deodorant properties.

FIG. 1 is a schematic view showing an example of a cushion carpet in which a cushion material is attached to a base cloth and the cushion material has a deodorant property. 1 in FIG. 1 is a pile,
2 is a base cloth, 3 is a sealing material, and 4 is a cushion material containing deodorant fibers.

The cushioning material used in the present invention is preferably composed of the low melting point fiber A and the deodorizing fiber B, or the low melting point fiber A, the deodorizing fiber B and the other fiber C having no deodorizing property. It is preferable that at least some of the contact points between the low melting point fibers A and between the low melting point fibers A and the deodorant fibers B and other fibers C are bonded and molded.

The deodorant fiber B used in the present invention is described in JP-A-3-
As described in Japanese Unexamined Patent Publication No. 124809, a polymer may be kneaded with a deodorant component.
It may be obtained by a method in which a deodorant component is added by post-processing as described in Japanese Patent Publication No. 978. Deodorant fiber B
Is, for example, as a method of applying a deodorant component by post-processing,
It can also be obtained by grafting a free acidic group by graft polymerization. The acidic group in this method means a carboxyl group or a sulfonic acid group, and the content of the acidic group is not less than 3.2 × 10 ⁻⁴ gram equivalent / g fiber in order to impart durable deodorizing performance. It is preferably 9.3 × 10 ⁻⁴ gram equivalent / gram fiber or more. Incidentally, the end of the introduced acidic group by graft polymerization -COOH or it is preferable in the state of -SO ₃ H, partially alkali metals or alkaline earth metals, more generally of metal or a quaternary ammonium salt, May be substituted by an ionic organic substance such as It is preferable to distribute a large amount of acidic groups to the surface of the fiber by such graft polymerization, because malodor such as ammonia, hydrogen sulfide, and mercaptans, which are said to be the root of malodor, can be efficiently absorbed.

The deodorant fiber B is preferably contained in the cushion material in an amount of 40% by weight or more based on the weight of the cushion material in order to effectively exert the deodorizing property of the cushion carpet. If it is less than 40% by weight, sufficient deodorizing performance may not be obtained.

The cross-sectional shape of the deodorant fiber B is not limited to the round cross section,
A modified cross section such as a polygon, a multileaf, an ellipse, or a hollow cross section thereof may be used.

Next, the deodorant fiber B preferably has a mechanical crimp in order to impart bulkiness and a soft feeling to the cushioning material used in the present invention and improve the recovery property against compression.
The number of crimps is 3 to 10 peaks / 25 mm, and the degree of crimp is 5 to 3
It is preferably 0%.

It is more preferable that this crimp is a latent crimp which is exhibited by asymmetric cooling during spinning in order to impart further bulkiness.

The deodorant fiber B constituting the cushion material has a fineness of 0.5 to 30 denier and a fiber length of 10 to 10 from the viewpoint of the shape fixing property and softness of the cushion material.
Short fibers of 0 mm are preferably used.

Next, the low melting point fiber A used in the present invention will be described. It is important that the low melting point fiber A has a melting point of 50 ° C. or more lower than the lowest melting point fiber among the fibers other than the pile fiber, the base fabric fiber and the fiber A constituting the cushion material. If the temperature is less than 50 ° C, the low melting point fiber A of the cushion material
When heat-bonding the base cloth and the cushion material, there is a problem that fibers other than the low melting point fiber are damaged.

From the viewpoint of the effect of adhesion and prevention of thermal deterioration, the melting point of the low melting point fiber is preferably in the range of 80 to 170 ° C, and more preferably in the range of 80 to 150 ° C.

Further, the low-melting point fiber A is preferably a composite fiber having a core-sheath structure, and the low-melting point polymer R1 is compounded in the sheath part of the composite fiber, and the polymer R2 is compounded in the core part.
The melting point of R1 is lower than that of polymer R2 by 50 ° C. or more,
The weight ratio represented by / R2 is preferably in the range of 40/60 to 90/10. If the weight ratio of R1 is less than 40%, the thermal adhesiveness between the fibers of the cushioning material may not be sufficiently obtained, or it may be difficult to bond the base cloth and the cushioning material and to fix the pile on the base cloth. . on the other hand,
The weight ratio of R1 may be 100% by weight,
When the carpet is used, the low melting point fibers A may be cut and become powder, which may cause dust generation. Therefore, the content is preferably 90% by weight or less.

Examples of the polyester low melting point polymer R1 include, for example, polyolefin such as polyethylene, polypropylene, ethylene propylene copolymer, ethylene butene copolymer, ethylene vinyl acetate copolymer or olefin copolymer, polyhexamethylene terephthalate. ,
At least one kind of polymer selected from thermoplastic polymers such as polyesters such as polyhexamethylene butylene terephthalate and polyhexamethylene terephthalate isophthalate or copolymerized polyesters can be used. In this case, the polymer R2 is not particularly limited, and examples thereof include terephthalic acid, 2,6-naphthalenedicarboxylic acid or an ester thereof as a main dicarboxylic acid component, and ethylene glycol or tetramethylene glycol as a main glycol component. A polyester such as butylene terephthalate or polyethylene 2,6-naphthalate can be used.

The polyamide low melting point polymer R1 can be obtained, for example, by copolymerizing nylon 6 with other nylon polymers such as nylon 10 and nylon 66, as in the case of polyester.

In addition to the low melting point fiber A, if necessary, R
In addition to pigments such as titanium oxide and carbon black other than R1 and R2, an antioxidant, a coloring inhibitor, a light stabilizer, an antistatic agent and the like may be added. Such a low melting point fiber A
Can be produced by a conventional composite spinning method.

As the low melting point fiber A, a short fiber having a fineness of 0.5 to 30 denier and a fiber length of 10 to 100 mm is preferably used from the viewpoints of heat adhesiveness, softness imparting and elasticity.

In the present invention, the low melting point fiber A in the cushion material is 20 to 60% by weight. When the amount of the fiber A is less than 20% by weight, there are problems that the number of thermal bonding points between the fibers A is small and the shape stability is deteriorated, and at the same time, the thermal bonding with the base fabric is insufficient. Further, when the amount of the fiber A exceeds 60% by weight, there is a problem that the soft feeling and elasticity of the cushioning material are deteriorated and, at the same time, the ratio of the deodorant fiber is decreased and the deodorizing effect is deteriorated.

Another object of the present invention is to provide a cushion carpet that is easy to recycle. As described above, in general carpets, in addition to the surface fiber that determines the basic performance of the carpet in order to obtain a quality suitable for the application, various materials different from the surface fiber are used on the back surface thereof. Although it is not easy to recycle a carpet composed of these various materials, the present invention makes it possible to obtain a cushion carpet that can be easily recycled while maintaining the quality suitable for the purpose of the carpet. Conventionally, in a cushion carpet, a cushion portion made of foamed polyurethane or the like is generally attached to the back surface of the carpet base cloth as a cushion material. However, since these foamed polyurethanes have different chemical compositions from the fiber components of pile fibers and base fabric, they are a major obstacle when they are collected and reused.

Therefore, in the present invention, the same type of polymer is used for the pile, the base cloth, the sealing material and the cushion material, and the pile is fixed to the base cloth by the low melting point fiber contained in the cushion material. By fixing the cushion material to the base cloth, the cushion carpet can be easily recycled.

The cushion carpet of the present invention is capable of material recycling, chemical recycling and thermal recycling. The fibers used may be synthetic fibers such as polyamide, polyester, polyacrylic, etc., but if the pile, the base cloth, the sealing material and the cushioning material are all made of polyester, the recovered product is melted and pelletized. It is preferable because it is easy to recycle materials that can be reused. More preferably, it is desirable that all of the pile, the base cloth, the sealing material and the cushioning material are made of nylon 6, and the recovered product is decomposed and returned to the original raw material. When the nylon 6 is unified, it is depolymerized and purified by the method described in Japanese Patent Publication No. 42-18476, Japanese Patent Application No. 6-127468, etc., recovered as ε-caprolactam, and again used as a raw material for nylon 6. Can be used.

Further, by constructing the cushion material 4 from fibers as in the present invention, the moisture permeability and the water permeability are enhanced and, for example, an effect that the tatami or wooden floor material is hardly corroded can be obtained.

Next, a method for manufacturing the cushion carpet of the present invention will be described. In the present invention, for example, it is preferable to tuft a pile of the same material as the base cloth by tufting in a general method.

On the other hand, as the cushion material, for example, a cotton feeding machine which is used in a usual spinning process by adding a low melting point fiber A and a deodorant fiber B, which are the same material as that of the base cloth or pile, and other fibers in some cases , A fiber other than the low-melting point fiber A above the melting point of the low-melting point fiber A after thoroughly mixing and opening the fiber into a web shape with a cotton mixing machine, a fiber opening machine, a carding machine, etc. and forming a laminated web with a cotton molding machine Among them, the sheet-shaped cushioning material can be obtained by heat treatment at a temperature lower than the melting point of the fiber having the lowest melting point.

This sheet-like cushion material is placed on the back surface of the base cloth of the carpet in which the pile is planted on the base cloth,
The heat treatment is performed at a temperature equal to or higher than the melting point of the low melting point fiber A constituting the cushion material and lower than the melting point of the fiber having the lowest melting point among the fibers other than the low melting point fiber of the pile, the base cloth and the cushion material, The adhesive and the pile can be fixed to the backing. It is necessary to perform the heat treatment at a temperature equal to or higher than the melting point of the low melting point fiber A, and at a temperature that does not impair the quality of fibers other than the low melting point fiber of the pile, the base cloth, and the cushion material. It is more preferable that the temperature is 10 ° C. or more lower than the melting point of the fiber having the lowest melting point among the fibers other than the low melting point fibers of the cloth and the cushion material.

As a method for sealing pile fibers to the base cloth, the low melting point fiber A of the cushion material may be melt-bonded, but the copolymer used for the low melting point fiber A in advance on the carpet after tufting. It is more preferable to apply fine polymer powder in advance and heat-treat it to seal the adhesive, or to seal the adhesive while heat-bonding the base cloth and cushion material while coating the low-melting polymer fine powder on the back surface of the base cloth. .

[0040]

Next, the present invention will be described in more detail with reference to Examples and Comparative Examples. The measuring methods of various characteristics described in the present invention are as follows.

[Deodorizing Property] Method A: Ammonia gas detector tube method was used to open a carpet of a carpet in a glass column, and 3 g of the carpet cushion was filled.
A gas having a concentration of ammonia gas of ppm is passed at a ventilation rate of 3.3 cm / sec, and the breakthrough time and the breakthrough adsorption amount are measured (as the breakthrough adsorption amount, after washing, in order to exert deodorant property, Is also preferably 12 mg / g or more).

Method B: About 5% ammonia water 3 × 6 cm
After impregnating 0.25 ml of the filter paper of No. 1 into a glass container of 150 ml, 0.5 g of the fiber obtained by opening the cushion material of the carpet is placed at the same time and sealed with a stopper, and the odor change after left for 4 hours is sensory evaluated. (Odorless, slightly odorous, odorous, and strong odor were evaluated.) [Pile sealing, adhesiveness between base cloth and cushioning material, elasticity of cushioning material] From excellent (◎), visually and by touch. Evaluation was made in 7 grades up to impossibility (x).

[Examples 1 to 3 and Comparative Examples 1 and 2] Ordinary nylon 6 chips were spun, stretched and crimped by the method described in Japanese Patent Publication No. 55-9086, melting point 215 ° C, fineness 2650 denier, A crimped yarn having a crimp elongation of 27% was obtained in a Ta-type hollow (hollow ratio 14%) having 160 filaments. Separately from this, ordinary nylon 6 chips are spun, stretched and crimped to have a melting point of 215 ° C. and a fineness of 2.5 denier, 5
A staple of 1 mm was used, and ordinary spinning, weaving, and processing were performed to obtain a nylon 6 fiber woven base fabric. Using this nylon 6 fiber woven fabric as a base fabric, the nylon 6 crimped yarns are pile length =
4.5 mm, stitch = 12.5 co / in, loop pile was tufted and dyed to make a carpet.

On the other hand, as the fiber cushion material, first, as the R1 of the low-melting fiber A, a conventional nylon having a melting point of 215.degree. 6 polymer R2 as a core, R / R represented by R1 / R2 having a weight ratio of 50/50
An unstretched yarn of a concentric low melting point composite fiber A having 2 as a core part and R1 as a sheath part was spun and drawn to obtain a low melting point fiber A having a fineness of about 4 denier and a cut length of 51 mm.

Separately, melting point 215 ° C. obtained by ordinary melt spinning and drawing, fineness 8 denier, cut length 51 m
m circular hollow (hollow ratio 16%) nylon 6 staple, and this staple was made of acrylic acid 19% owf, methacrylic acid 30% owf, ammonium persulfate 1% owf,
Superlite C (manufactured by Mitsubishi Gas Chemical Co., Inc.) 3% owf, a bath ratio of 1:14, heated from room temperature to 80 ° C at a rate of 1 ° C / minute, and graft polymerized at 80 ° C for 60 minutes. Deodorized fiber B was used.

The graft ratio of methacrylic acid on 100% of this deodorant fiber B was determined from the rate of weight increase, and the amount of carboxyl groups was determined to be 3.27 × 10 ^-2 gram equivalent / gram fiber. Cut the cross section of deodorant fiber B,
When the distribution state of carboxyl groups was examined by dyeing with a cationic dye, it was confirmed that many of them were present on the surface of the fiber.

The deodorant property of 100% of this deodorant fiber B was 34.7 mg / g before washing with the breakthrough adsorption amount of Method A, and 3 after washing.
1.1 mg / g, method B is odorless both before and after washing,
It exhibited extremely high deodorant properties. The breakthrough time before washing of Method A was 46 minutes.

The low melting point fiber A and the deodorant fiber B are mixed, further mixed and opened with a roller card to form a web, and a laminated web is formed with a cotton molding machine, and then continuously dried at 135 ° C. While passing through the atmosphere, the intersections of the low melting point fibers A and a part of the intersections of the low melting point fibers A and the antibacterial fibers B were adhered to each other to obtain a sheet-like fiber cushion material. In the above blended cotton, Example 1 was blended with 20% by weight of low melting point fiber A and 80% by weight of deodorant fiber B, and Example 2 was blended with low melting point fiber A.
40% by weight, deodorant fiber B was mixed at 60% by weight, Example 3 was mixed with low melting point fiber A at 60% by weight, deodorant fiber B was mixed at 40% by weight, Comparative Example 1 was low melting point fiber A at 18%. %, 82% by weight of deodorant fiber B was mixed, and in Comparative Example 2, 61% by weight of low melting point fiber A and 39% by weight of deodorant fiber B were mixed.

Further, a sheet-like fiber cushion material is laminated on the back surface of the base fabric of the carpet and continuously dried at 140 ° C.
While passing through the atmosphere, the base cloth and the cushion material were adhered and the pile was fixed to the base cloth with the low melting point fiber A constituting the cushion material to obtain a cushion carpet partially containing the deodorant fiber. .

Table 1 shows the properties of the obtained cushion carpet.

[0051]

[Table 1] Examples 1, 2 and 3 contain 80 to 40% by weight of deodorant fiber,
20 to 60% by weight of low-melting point fiber is mixed, and the deodorant property is 13.7 to 27.8 mg / g before washing and 12.2 to 24.9 mg / g even after washing to achieve the target deodorizing property. Indicated. Moreover, the pile sealing property, the adhesiveness between the base cloth and the cushion material, and the elasticity of the cushion material were good.

On the other hand, Comparative Example 1 contained 82% by weight of deodorant fiber, and although the deodorant property and the material elasticity of the cushion were good, the blended cotton of the low melting point fiber was as low as 18% by weight, and the pile eye The stopping property and the adhesiveness between the base cloth and the cushion material were poor. In Comparative Example 2, the low melting point fiber was as large as 61% by weight, and the elasticity of the cushioning material was slightly inferior.
The carpets of Examples 1 to 3 were collected after use for 6 months and then defibrated by using an anti-fluffing machine. Disentangled fibers are special Japanese Sho
It was depolymerized and purified by the method described in JP-A-2-18476 and recovered as ε-caprolactam.

[0053]

According to the cushion carpet and the method of manufacturing the same of the present invention, it is possible to provide a cushion carpet having a deodorant property and a moisture permeability, a comfortable feeling of use, and easy recycling, and a method of manufacturing the same.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing an example of a cushion carpet of the present invention as a model.

[Explanation of symbols] 1: Pile 2: Base fabric 3: Sealing material 4: Cushion material containing deodorant fiber

Claims (9)

[Claims] 1. A cushion carpet in which pile fibers are planted and sealed in a base cloth and a cushion material is attached to the back surface of the base cloth, and the cushion material comprises two or more kinds of fibers having a low melting point fiber A and a deodorant fiber B. The melting point of the low melting point fiber A is 50 ° C. or more lower than the lowest melting point fiber other than the low melting point fiber A constituting the pile fiber, the base fabric fiber and the cushioning material, and the low melting point fiber A A cushion carpet containing 20 to 60% by weight of the cushion material. 2. A low melting point fiber A of a cushion material is a composite fiber having a core-sheath structure, and a polymer R1 of a sheath portion of the composite fiber.
Is 50 ° C higher than the melting point of polymer R2 at the core of the composite fiber
Or more, and the weight ratio represented by R1 / R2 is 40 /
The cushion carpet according to claim 1, which is in a range of 60 to 90/10. 3. Deodorant fiber B is 40% by weight in the cushion material.
The cushion carpet according to claim 1, wherein the cushion carpet is included as described above. 4. The cushion carpet according to any one of claims 1 to 3, wherein the pile, the base cloth, the sealing material and the cushion material are all made of the same type of polymer. 5. The cushion carpet according to any one of claims 1 to 4, wherein the pile, the base cloth, the sealing material and the cushion material are all made of polyester. 6. The cushion carpet according to any one of claims 1 to 4, wherein the pile, the base cloth, the sealing material and the cushion material are all made of nylon 6. 7. The cushion according to claim 6, wherein the deodorant fiber of the cushion material is nylon 6 containing 3.2 × 10 ⁻⁴ gram equivalent / gram fiber or more of free carboxyl groups. carpet. 8. A melting point of the low melting point fiber A, wherein two or more kinds of fibers including a low melting point fiber A and a deodorant fiber B are used, and a laminated web is formed by mixing, opening and carding these fibers. As described above, the cushion material is formed by heat-treating at a temperature lower than the melting point of the fiber having the lowest melting point among the fibers other than the low melting point fiber A, and further, pile fibers are planted on the base cloth to form a carpet, and the carpet is obtained. The cushioning material is overlaid on the back surface of the base fabric, and is lower than the melting point of the fiber having the lowest melting point among the fibers other than the low melting point fiber A constituting the pile fiber, the base fabric fiber and the cushioning material and having a melting point equal to or higher than the melting point of the low melting point fiber A. A method for producing a cushion carpet, comprising heat-treating at a temperature to seal pile fibers and to bond a cushion material and a base cloth together. 9. The method for producing a cushion carpet according to claim 8, wherein the same type of polymer is used for the pile, the base cloth, the sealing material and the cushion material.