Nonwoven fabric, and mattress and topper comprising same

Abstract

The present invention relates to a non-woven fabric, and a mattress and a topper, including same and, more specifically, to: a non-woven fabric having excellent elasticity, adhesive strength, and elasticity and exhibiting excellent processability during manufacture; and a mattress and a topper, including same.

Description

Non-woven fabrics, mattresses and toppers containing the same

[0001] The present invention relates to a nonwoven fabric, a mattress and a topper comprising the same, and more particularly, to a nonwoven fabric that exhibits excellent elasticity, adhesiveness and stretchability, and at the same time exhibits excellent processability during manufacturing, and a mattress and a topper comprising the same.

[0002] Polyurethane foam is typically manufactured by mixing isocyanate and polyol with blowing agents, catalysts, and other ingredients, and simultaneously initiating foaming and polymerization reactions. Polyurethane foam is lightweight and boasts excellent thermal insulation, electrical insulation, chemical resistance, resilience, and durability, making it widely used as an elastic material in cushioning applications. However, polyurethane foam faces challenges such as yellowing and odor, environmental hazards, and deterioration of physical properties.

[0003] Meanwhile, in addition to polyurethane foam, fiber aggregates bonded with environmentally friendly, non-hazardous heat-bonded fibers are also being used as elastic materials. Elastomers, used as fiber aggregates, are utilized in a wide range of applications, including packaging, automotive interiors, and elastic fibers, due to their unique elasticity. Furthermore, unlike non-recyclable rubber, these elastomers are easily recyclable, leading to a significant increase in demand. Thermoplastic polyester copolymers, in particular, are used as fiber aggregates due to their excellent elasticity.

[0004] Thermoplastic elastomers (TPEs) are polymers that possess two distinct properties: the ability to reform when heated, which makes them thermoplastic, and the elastic properties of elastomers, rubber-like polymers. Thermoplastic elastomers are a type of block copolymer, typically composed of hard segment blocks that exhibit thermoplastic properties and soft segment blocks that exhibit elasticity, allowing them to exhibit these two distinct properties simultaneously.

[0005] These thermoplastic elastomers are manufactured by copolymerizing acid components such as terephthalic acid, dimethyl terephthalate, isophthalic acid, and dimethyl isophthalate with diol components such as poly(tetramethylene ether) glycol, butanediol, polyethylene glycol, and ethylene glycol. However, the manufacturing of low-melting-point thermoplastic elastomers using this polymerization method has the problem of requiring equipment to store and feed butanediol and to recover byproducts such as tetrahydrofuran. In particular, tetrahydrofuran is a highly hazardous substance that is toxic and explosive, making safety management difficult.

[0006] In addition, although the demand for these thermoplastic elastomers is increasing significantly, the market size is relatively small, so there is a disadvantage in that fixed costs increase when producing polymers through polymerization, leading to increased costs.

[0007] [Prior Art Literature]

[0008] [Patent Document]

[0009] (Patent Document 1) Patent Publication No. 10-2016-0014627 (February 11, 2016)

[0010] The present invention has been devised to solve the above problems, and its purpose is to provide a nonwoven fabric having excellent elasticity, adhesiveness, and stretchability, and exhibiting excellent manufacturing processability, and a mattress and topper including the same.

[0011] In order to solve the above-described problem, the present invention provides a nonwoven fabric including a heat-adhesive composite fiber and having a permanent compression set of 23 to 33% and an adhesive strength of 55 to 130 N.

[0012] According to one embodiment of the present invention, the heat-adhesive composite fiber may include TPEE (Thermoplastic Polyether-ester Elastomer).

[0013] Additionally, the above TPEE may have a melting point of 125 to 160°C.

[0014] In addition, the TPEE may have a number average molecular weight (Mn) of 30,000 to 35,000, a weight average molecular weight (Mw) of 70,000 to 75,000, and a Z average molecular weight (Mz) of 100,000 to 130,000.

[0015] Additionally, the TPEE may have a ratio of weight average molecular weight to number average molecular weight (Mw / Mn) of 2.0 to 2.4.

[0016] Additionally, the TPEE may have a ratio of Z-average molecular weight to weight-average molecular weight (Mz / Mw) of 1.5 to 1.8.

[0017] In addition, the above TPEE may have a crystallization temperature of 45 to 85°C, and a melting index measured at a temperature of 190°C may be 9 to 33 g / min.

[0018] Additionally, the heat-adhesive composite fiber may include a first component and a second component having a melting point or softening point lower than that of the first component.

[0019] In addition, the heat-adhesive composite fiber may be a sheath-core type fiber including a core portion and a sheath portion, and the heat-adhesive composite fiber may include the first component in the core portion and the second component in the sheath portion.

[0020] Additionally, the TPEE may be included in the above-mentioned system.

[0021] Additionally, the above-mentioned system may include the second component and the TPEE in a weight ratio of 30:70 to 70:30.

[0022] Additionally, the nonwoven fabric may have a compressive hardness of 2.1 to 3.5 N and a rebound elasticity of 40 to 60%.

[0023]

[0024] In addition, the present invention provides a mattress including the above-described nonwoven fabric.

[0025]

[0026] In addition, the present invention provides a topper comprising the nonwoven fabric described above.

[0027] The nonwoven fabric of the present invention, and the mattress and topper containing the same, have excellent elasticity, adhesiveness, and stretchability, and also have excellent processability during manufacturing.

[0028] Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0029]

[0030] The nonwoven fabric of the present invention comprises a heat-adhesive composite fiber and is implemented to have a permanent compression set of 23 to 33% and an adhesive strength of 55 to 130 N.

[0031] Hereinafter, the composition of the nonwoven fabric of the present invention will be described.

[0032] First, the above-mentioned heat-adhesive composite fiber will be described.

[0033] The above heat-adhesive composite fiber is provided in a nonwoven fabric and functions to fix each fiber within the nonwoven fabric and improve adhesive strength.

[0034] The above heat-adhesive composite fiber may include a first component and a second component having a melting point or softening point lower than that of the first component.

[0035] At this time, the first component may include a polyester resin, and preferably may include at least one selected from polyethylene terephthalate (PET; poly(ethylene terephthalate)) resin and polybutylene terephthalate (PBT; poly(butylene terephthalate)) resin, and preferably may include a polyethylene terephthalate resin.

[0036] In addition, the second component may include a polyester resin, preferably at least one selected from polyethylene terephthalate (PET; poly(ethylene terephthalate)) resin and polybutylene terephthalate (PBT; poly(butylene terephthalate)) resin, preferably a PET resin, and more preferably a Co-PET resin.

[0037] Meanwhile, the heat-adhesive composite fibers may be sheath-core type fibers each including a core portion and a sheath portion, and the first heat-adhesive composite fiber may include the first component in the core portion and the second component in the sheath portion.

[0038] At this time, the heat-adhesive composite fiber may include an elastomer, preferably, the sheath may include an elastomer, and the elastomer may be a thermoplastic elastomer, preferably a thermoplastic polyester ether elastomer (TPEE), which may be more advantageous in achieving the purpose of the present invention.

[0039] The above TPEE may have a melting point of 125 to 160°C, preferably 130 to 155°C. If the melting point of the TPEE is less than 125°C, the processability may be reduced during spinning, and the surface of the nonwoven fabric may become film-like, thereby reducing the adhesive strength between fibers in the internal region of the nonwoven fabric. If the melting point of the TPEE exceeds 160°C, the processability may be reduced due to spinnability defects during the production of heat-adhesive composite fibers.

[0040] In addition, the TPEE may have a number average molecular weight (Mn) of 30,000 to 35,000, preferably a number average molecular weight (Mn) of 30,500 to 34,500, a weight average molecular weight (Mw) of 70,000 to 75,000, preferably a weight average molecular weight (Mw) of 70,500 to 74,500, and a Z average molecular weight (Mz) of 100,000 to 130,000, preferably a Z average molecular weight (Mz) of 110,000 to 125,000. If the number average molecular weight (Mn) of the TPEE is less than 30,000, the processability may be deteriorated because spinnability defects may occur as the viscosity increases, and if the number average molecular weight (Mn) exceeds 35,000, the processability may be deteriorated because the viscosity decreases, making spinnability impossible or spinnability deteriorated. In addition, if the weight average molecular weight (Mw) of the TPEE is less than 70,000, the processability may be deteriorated because the viscosity increases, making spinnability defects may occur, and if the weight average molecular weight (Mw) exceeds 75,000, the processability may be deteriorated because the viscosity decreases, making spinnability impossible or spinnability deteriorated. In addition, if the Z-average molecular weight (Mz) of the above TPEE is less than 100,000, the viscosity may increase, causing radioactivity defects, which may deteriorate the fairness, and if the Z-average molecular weight (Mz) exceeds 130,000, the viscosity may decrease, making radioactivity impossible or causing radioactivity to decrease, which may deteriorate the fairness.

[0041] In addition, the TPEE may have a ratio of the weight average molecular weight to the number average molecular weight (Mw / Mn) of 2.0 to 2.4, and preferably, the ratio of the weight average molecular weight to the number average molecular weight (Mw / Mn) may be 2.05 to 2.35. If the ratio of the weight average molecular weight to the number average molecular weight (Mw / Mn) of the TPEE is less than 2.0, the polymer may become uneven, which may result in a decrease in spinnability, thereby deteriorating the processability. In addition, if the ratio of the weight average molecular weight to the number average molecular weight (Mw / Mn) exceeds 2.4, spinnability may not be possible or spinnability may be reduced.

[0042] In addition, the TPEE may have a ratio of the Z-average molecular weight to the weight-average molecular weight (Mz / Mw) of 1.5 to 1.8, and preferably, the ratio of the Z-average molecular weight to the weight-average molecular weight (Mz / Mw) of the TPEE may be 1.55 to 1.75. If the ratio of the Z-average molecular weight to the weight-average molecular weight (Mz / Mw) of the TPEE is less than 1.5, the polymer may become uneven, which may result in a decrease in spinnability, thereby deteriorating the processability. In addition, if the ratio of the Z-average molecular weight to the weight-average molecular weight (Mz / Mw) exceeds 1.8, spinnability may not be possible or spinnability may be reduced.

[0043] In addition, the TPEE may have a crystallization temperature of 45 to 85°C, and preferably, the crystallization temperature may be 50 to 80°C. If the crystallization temperature of the TPEE is lower than 45°C, the elasticity of the nonwoven fabric may be reduced, and if the crystallization temperature exceeds 85°C, there may be a problem of fiber-to-fiber bonding occurring at room temperature.

[0044] In addition, the melting index of the TPEE measured at a temperature of 190°C may be 9 to 33 g / min, and preferably, the melting index measured at a temperature of 190°C may be 12 to 30 g / min. If the melting index of the TPEE measured at a temperature of 190°C is less than 9 g / min, the adhesive strength may be reduced, and if the melting index of the TPEE measured at a temperature of 190°C exceeds 33 g / min, the adhesive strength may be reduced as the flowability is reduced.

[0045] Meanwhile, the sis part may contain the second component and the TPEE in a weight ratio of 30:70 to 70:30, preferably, the sis part may contain the second component and the TPEE in a weight ratio of 33:67 to 67:33. If the weight ratio of the second component and the TPEE in the sis part is less than 30:70 (the second component is less than 30, the TPEE is more than 70), the cost may increase, the compression set may become excessively large, and the compressive hardness and rebound elasticity may decrease, and if the weight ratio of the second component and the TPEE in the sis part exceeds 70:30 (the second component is more than 70, the TPEE is less than 30), the compression set may become excessively large, and the adhesiveness may decrease.

[0046] In addition, the heat-adhesive composite fiber may have a fineness of 0.5 to 20 De, and preferably a fineness of 2 to 10 De. If the fineness of the heat-adhesive composite fiber is less than 2 De, the nonwoven fabric may become hard, and if the fineness exceeds 20 De, the nonwoven fabric may become bulky.

[0047] Meanwhile, the above-mentioned heat-adhesive composite fiber can exhibit softening behavior at 140 to 230°C.

[0048]

[0049] The nonwoven fabric according to the present invention may have a compression set of 23 to 33%, preferably 24 to 32%, and an adhesive strength of 55 to 130 N, preferably 80 to 125 N. If the compression set is less than 23%, the nonwoven fabric may have a hard feel due to good elasticity, and if the compression set exceeds 33%, the nonwoven fabric may have a problem of sagging due to lack of elasticity. In addition, if the adhesive strength is less than 55 N, the adhesiveness may not be good, and if the adhesive strength exceeds 130 N, the nonwoven fabric may have a problem of being hard.

[0050] In addition, the nonwoven fabric of the present invention may have a compression hardness of 2.1 to 3.5 N, preferably a compression hardness of 2.1 to 3.5 N, and a rebound elasticity of 40 to 60%, preferably a rebound elasticity of 43 to 57%. If the compression hardness is less than 2.1 N, there may be a problem of lack of elasticity, and if the compression hardness exceeds 3.5 N, there may be a problem of hardness. In addition, if the rebound elasticity is less than 40%, there may be a problem of excessive softness, and if the rebound elasticity exceeds 60%, there may be a problem of hardness.

[0051]

[0052] In addition, the heat-adhesive composite fiber included in the nonwoven fabric of the present invention can be manufactured by including the following steps 1 to 5.

[0053] First, as a first step, the first component and the second component are introduced into a composite spinning device and subjected to composite spinning to manufacture an unstretched sub-tow.

[0054] The composite spinning of the first stage described above can be performed through various types of detention, and the sub-tow manufactured according to the type of detention can preferably be a sheath-core type monofilament through a sheath-core type detention. In this case, the core portion of the sheath-core type monofilament can include the first component, and the sheath portion can include the second component.

[0055] Next, as a second step, the unstretched subtow can be stretched, or stretched and then dried and heat-set.

[0056] At this time, stretching can be performed by stretching the unstretched subtow by 2.0 to 6.0 times, preferably 3.0 to 5.0 times, at 20℃ to 90℃. At this time, if the stretching ratio is less than 2.0 times, the elongation may increase, which may reduce the properties of the application product using the composite fiber, and if the stretching ratio exceeds 6.0 times, there may be a problem of yarn breakage, so it is recommended to perform stretching within the above range.

[0057] In addition, drying and heat setting can be performed at a temperature of 50 to 120°C, and preferably at 70 to 115°C. At this time, the drying and heat setting time can be performed for 1 to 60 minutes, and preferably 3 to 50 minutes, and various crimped shapes can be expressed by the heat setting.

[0058] Next, as a third step, the extended or extended, dried and heat-set subtow can be immersed in a hydrophilic emulsion to coat the surface.

[0059] At this time, any hydrophilic emulsion that can be commonly used in the art can be used as the hydrophilic emulsion, and preferably, it can include at least one selected from among ionic surfactants, nonionic surfactants, anionic surfactants, and zwitterionic surfactants.

[0060] Next, as a fourth step, crimping can be applied to the surface-coated subtow. The crimping can be performed using a common crimping method available in the art.

[0061] Finally, as a fifth step, the compressed sub-tow can be cut to produce a heat-bonded composite fiber.

[0062] In addition, the cutting of the fifth step is a process of cutting the heat-fixed sub-tow so that the composite fiber has an appropriate fiber length depending on the processed product to be used with the composite fiber, and can be performed using a general cutting method available in the art.

[0063]

[0064] Meanwhile, the nonwoven fabric of the present invention can be manufactured by performing the air-through bonding method or calendaring method on the above-described heat-adhesive composite fiber.

[0065] As an example, the method for manufacturing a nonwoven fabric of the present invention includes a first step of manufacturing a nonwoven web by carding the above-described heat-adhesive composite fiber, and a second step of manufacturing a nonwoven fabric by heat-treating the nonwoven web.

[0066] At this time, heat treatment can be performed by a hot air blower, and the heat treatment can be performed at a temperature of 140 to 180°C, preferably 150 to 170°C, for 1 second to 10 minutes, preferably 2 seconds to 5 minutes. If the heat treatment temperature is less than 140°C, it may cause a deterioration in the physical properties of the nonwoven fabric, and if the heat treatment temperature exceeds 180°C, adhesion of the nonwoven fabric may be difficult.

[0067]

[0068] Although the present invention has been described above with reference to embodiments, these are merely examples and are not intended to limit the present invention to the embodiments. Those skilled in the art to which the present invention pertains will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present invention. For example, each component specifically shown in the embodiments of the present invention can be modified and implemented. In addition, differences related to such modifications and applications should be interpreted as being included within the scope of the present invention defined in the appended claims.

[0069]

[0070] [Example]

[0071] <Example 1>

[0072] First, the first component as the core (SD PET, IV 0.65 dl / g, A2210, TAK) and the second component as the sheath (TPEE: SK Chemicals / LM, IV 0.58, TAK) were introduced into a sheath-core type spinneret and compositely spun to manufacture a sheath-core type unstretched-subtow having circular cross sections of the sheath and core parts and containing the first component in the core part and the second component in the sheath part. At this time, the sheath part contained the second component and TPEE having a melting point of 145°C, a number average molecular weight (Mn) of 32,500, a weight average molecular weight of 72,500, a Z average molecular weight (Mz) of 120,000, a crystallization temperature of 65°C, and a melting index of 21 g / min measured under the conditions of 190°C, in a weight ratio of 45:55.

[0073] Then, the manufactured sheath-core type unstretched sub-tow was stretched 4.0 times at a temperature of 80℃, dried and heat-set at a temperature of 90℃ for 10 minutes, and the stretched and heat-set sub-tow was immersed in a hydrophilic emulsion to coat the surface, and then crimped on the surface-coated sub-tow using a crimper, and the crimped sub-tow was cut to manufacture a heat-bondable composite fiber having a fineness of 6De and a fiber length of 64mm. At this time, the cross-sectional area ratio of the core part and the sheath part was 3:2.

[0074] Thereafter, the heat-adhesive composite fiber manufactured above was carded to manufacture a nonwoven web, and the manufactured nonwoven web was heat-treated at a temperature of 160℃ for 20 seconds using a circulating hot air blower to manufacture a nonwoven fabric. The basis weight of the manufactured nonwoven fabric was 1050gsm and the thickness was 50mm.

[0075]

[0076] <Examples 2 to 18 and Comparative Examples 1 to 5>

[0077] Nonwoven fabrics were manufactured in the same manner as in Example 1, but the number average molecular weight, weight average molecular weight, Z average molecular weight, crystallization temperature, melting index, and content of TPEE were changed to manufacture nonwoven fabrics as shown in Tables 1 to 4 below.

[0078]

[0079] <Experimental Example>

[0080] The following physical properties were evaluated for the nonwoven fabrics according to the above examples and comparative examples and are shown in Tables 1 to 4.

[0081] 1. Measurement of permanent compression set

[0082] For the nonwoven fabrics according to the above examples and comparative examples, the compression set was measured using the ASTM D3574 (Felxible cellular Materials - Slab, Bonded, and Molded Unrethane Foams) TEST D method.

[0083] 2. Adhesive strength measurement

[0084] For the nonwoven fabrics according to the above examples and comparative examples, the carded nonwoven fabrics were placed in a Teflon-coated mold with a basis weight of 375 gsm and a width*length*height of 30 cm*30 cm*1 cm, and then heat-treated at a temperature of 160°C for 10 minutes to manufacture them, after which they were cut into width*length of 10 cm*2 cm. The cut samples were measured more than 10 times using Instrong equipment, and the average value was taken to measure the adhesive strength.

[0085] 3. Compressive hardness measurement

[0086] For the nonwoven fabrics according to the above examples and comparative examples, the compressive hardness was measured using the method of KS M ISO 3386-1.

[0087] 4. Measurement of rebound elasticity

[0088] For the nonwoven fabrics according to the above examples and comparative examples, the rebound elasticity was measured using the ASTM D3574 (Felxible cellular Materials - Slab, Bonded, and Molded Unrethane Foams) TEST H method.

[0089] 5. Fairness Evaluation

[0090] For the nonwoven fabrics according to the above examples and comparative examples, each nonwoven fabric was manufactured a total of 500 times, and the number of times any problems, such as poor spinnability or occurrence of fiber-to-fiber bonding at room temperature, were counted to measure the fairness.

[0091] Classification Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 TPEE Number average molecular weight (Mn) 32,500 29,000 30,500 34,500 37,000 31,000 Weight average molecular weight (Mw) 72,500 71,000 71,500 73,000 73,500 69,000 Mw / Mn 2.2 3 12 .4482.3442.1161.9862.226ZAverage molecular weight (Mz)120,000108,000113,000121,000124,000106,000Mz / Mw1.6551.5211.581.6581.6871.536Crystallization temperature (℃)656565656565@190℃ Melt index (g / min) 212121212121 Weight ratio of the second component and TPEE 45:5545:5545:5545:5545:5545:55 Permanent compression set (%) 28.130 28.5 28.9 2830 Adhesive strength (N) 123.9 123 121.2 122 110 121 Compressive hardness (N) 2.8 2.5 2.7 2.7 2.6 2.4 Rebound elasticity (%) 58.2 5 5 6.7 5 5.3 5 4 5 3 Fairness (times) 1172 11918

[0092] Classification Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 TPEE Number average molecular weight (Mn) 31, 500 33, 500 34, 000 31, 000 31, 500 33, 500 Weight average molecular weight (Mw) 70, 500 74, 500 76, 000 71, 000 70, 500 72, 000 Mw / Mn 2.2 382.2242.2352.292.2382.149ZAverage molecular weight (Mz)110,000121,000123,00095,000110,000125,000Mz / Mw1.561.6241.6181.3381.561.736Crystallization temperature (℃)656565656565@190℃ Melt index (g / min) 212121212121 Weight ratio of the second component and TPEE 45:5545:5545:5545:5545:5545:55 Permanent compression set (%) 28.3 28.7 293 128.5 28.9 Adhesive strength (N) 122.2 123.1109 119.5 120.2 121.5 Compressive hardness (N) 2.7 2.7 2.4 2.6 2.7 2.7 Rebound elasticity (%) 55.7 56.3 5653.15 5.6 55.8 Processability (times) 1217 2013

[0093] Classification Example 13 Example 14 Example 15 Example 16 Example 17 Example 18 TPEE Number average molecular weight (Mn) 34,000 32,500 32,500 32,500 32,500 32,500 Weight average molecular weight (Mw) 73,500 72,500 72,500 72,500 72,500 72,500 Mw / Mn2. 162.2312.2312.2312.2312.231ZAverage molecular weight (Mz)140,000120,000120,000120,000120,000120,000120,000Mz / Mw1.91.6551.6551.6551.6551.655Crystallization temperature (℃)654090656565@190℃ Melting index (g / min) 21212162121 Second component and TPEE weight ratio 45:5545:5545:5545:5533:6767:33 Permanent compression set (%) 30.2X29X3232 Adhesive strength (N) 118X110X102125 Compressive hardness (N) 2.5X2.8X2.92.8 Rebound elasticity (%) 53.4X57X5959 Processability (times) 17X39X10

[0094] Classification Comparison Example 1 Comparison Example 2 Comparison Example 3 Comparison Example 4 Comparison Example 5 TPEE Number average molecular weight (Mn) 32,500 32,500 32,500 32,500 32,500 Weight average molecular weight (Mw) 72,500 72,500 72,500 72,000 72,500 Mw / Mn 2.23 12.23 12.23 12.23 12.23 12.23 Z Average molecular weight (Mz) 120,000 120,000 120,000 120,000 120,000 Mz / Mw 1.65 5 1.65 5 1.65 5 1.65 5 1.65 5 Crystallization temperature (℃) 65 65 20 75 65 @ 190℃ Melt index (g / min) 2121775037 Second component and TPEE weight ratio 25:7575:2555:450:10045:55 Permanent compression set (%) 3420322132 Adhesive strength (N) 1305150135135 Compressive hardness (N) 2.03.61.73.12.9 Rebound elasticity (%) 3862485659 Fairness (times) 1215191524

[0095] As can be seen in Tables 1 to 4 above, Examples 1, 3, 4, 7, 8, 11, 12, 17 and 18, which all satisfy the number average molecular weight, weight average molecular weight, Z average molecular weight, crystallization temperature, melting index and content of the TPEE of the present invention, were found to have appropriate permanent compression set, adhesive strength, compressive hardness and rebound resilience, while also having excellent elasticity and excellent manufacturing processability, compared to Examples 2, 5, 6, 9, 10, 13 to 16 and Comparative Examples 1 to 5, which do not satisfy any of these.

[0096]

[0097] Simple modifications or changes of the present invention can be easily implemented by a person having ordinary skill in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

Claims

1. Contains heat-adhesive composite fibers, Nonwoven fabric with a permanent compression set of 23 to 33% and an adhesive strength of 55 to 130 N.

2. In paragraph 1, The above heat-adhesive composite fiber is a nonwoven fabric containing TPEE (Thermoplastic Polyether-ester Elastomer).

3. In paragraph 2, The above TPEE is a nonwoven fabric with a melting point of 125 to 160°C.

4. In paragraph 2, The above TPEE is a nonwoven fabric having a number average molecular weight (Mn) of 30,000 to 35,000, a weight average molecular weight (Mw) of 70,000 to 75,000, and a Z average molecular weight (Mz) of 100,000 to 130,000.

5. In paragraph 2, The above TPEE is a nonwoven fabric having a ratio of weight average molecular weight to number average molecular weight (Mw / Mn) of 2.0 to 2.

4.

6. In paragraph 2, The above TPEE is a nonwoven fabric having a ratio of Z-average molecular weight to weight-average molecular weight (Mz / Mw) of 1.5 to 1.

8.

7. In paragraph 2, The above TPEE is a nonwoven fabric having a crystallization temperature of 45 to 85°C and a melting index of 9 to 33 g / min measured under a temperature condition of 190°C.

8. In paragraph 2, The above heat-adhesive composite fiber is a nonwoven fabric comprising a first component and a second component having a melting point or softening point lower than that of the first component.

9. In paragraph 8, The above heat-adhesive composite fiber is a sheath-core type fiber including a core portion and a sheath portion, The above heat-adhesive composite fiber is a nonwoven fabric comprising the first component in the core portion and the second component in the sheath portion.

10. In paragraph 9, A nonwoven fabric comprising the TPEE in the above-mentioned sys portion.

11. In paragraph 10, The above-mentioned system is a nonwoven fabric comprising the second component and the TPEE in a weight ratio of 30:70 to 70:

30.

12. In paragraph 1, The above nonwoven fabric has a compressive hardness of 2.1 to 3.5 N and a rebound elasticity of 40 to 60%.

13. A mattress comprising a nonwoven fabric according to any one of claims 1 to 12.

14. A topper comprising a nonwoven fabric according to any one of claims 1 to 12.