WO2013105587A1

WO2013105587A1 - Long-fiber non-woven fabric with excellent softness and excellent abrasion resistance and use thereof

Info

Publication number: WO2013105587A1
Application number: PCT/JP2013/050258
Authority: WO
Inventors: 坂本　浩之; 吉田　英夫; 直史皆川; 博司田邊
Original assignee: 東洋紡株式会社
Priority date: 2012-01-11
Filing date: 2013-01-10
Publication date: 2013-07-18
Also published as: JP2013142208A; CN104066880A; KR20140109419A; KR101884500B1; CN104066880B; JP5888495B2

Abstract

The present invention addresses the problem of providing a long-fiber non-woven fabric with excellent softness and excellent abrasion resistance, particularly, a long-fiber non-woven fabric suitable for a disposable body warmer. This long-fiber non-woven fabric for a disposable body warmer is a thermocompression-bonded, spunbonded non-woven fabric which is manufactured by a spunbond method through thermocompression bonding using a pair of engraved and flat rolls. The thermocompression-bonded, spunbonded non-woven fabric is composed of long fibers which comprise at least 95% of polyethylene terephthalate and which exhibit a birefringence of 0.07 to 0.12, and has a KES bending rigidity of 0.05 to 0.30gf·cm²/cm and abrasion resistance grades satisfying the relationships (1) to (3): E1 ≥ 3 ··· (1); E2 ≥ 1 ··· (2); and E1 - E2 ≥ 1 ··· (3) [wherein E1 is the abrasion resistance grade of the embossed surface of the non-woven fabric, and E2 is that of the other surface thereof which is reverse to the embossed surface].

Description

Long-fiber nonwoven fabric with excellent flexibility and wear resistance and its use

The present invention relates to a long-fiber nonwoven fabric that is excellent in flexibility and wear resistance and is suitable as a base material used in the form of a bag. More specifically, the present invention relates to a long fiber nonwoven fabric particularly suitable for a disposable warmer base fabric.

Conventionally, films, woven and knitted fabrics, long-fiber non-woven fabrics, and the like have been used as packaging materials in which a fabric is made into a bag shape and powders and granular materials are placed therein. In particular, in disposable warmer applications, the bag is generally filled with a composition that generates heat when exposed to air, and the product life is strongly influenced by the breathability of the packaging material, and it is easy to control the breathability. Perforated films, microporous films, and the like have been used. However, these films are poor in flexibility and have a problem in the feeling of use, and no film that satisfies both the air permeability control and the feeling of use has been proposed. In addition, the film had a problem that it was easily torn.

In order to solve the problem of feeling of use, for example, in Patent Documents 1 and 2, as a packaging material for a disposable body warmer, it is possible to prevent a sticky touch peculiar to a film, an unpleasant touch, etc. In order to give the layer a difficulty in tearing, a non-woven fabric laminated to a film has been proposed. However, when conventional nonwoven fabrics are used, considering the difficulty of tearing the packaging material and less fluffing, it becomes harder and more irritating. There was a problem of poor retention.

As a method for solving such a problem, for example, Patent Document 3 proposes a method for improving the flexibility of the adhesive surface with the skin by adjusting the bonding between the nonwoven fabric provided with irregularities by embossing and the laminate film. However, even in such a method, no study has been made to improve the flexibility of the nonwoven fabric, and the non-joint portion of the nonwoven fabric is mainly joined to the laminate film by lamination, so that the softness of the nonwoven fabric is restrained. There was a problem that could not make full use of sex.

Further, Patent Document 4 proposes a method for improving the thermal function by limiting the thickness and apparent density of the nonwoven fabric. However, this method only adjusts the initial heat transfer from the heating element by the thickness, and has not been studied to improve the flexibility, heat sealability, and shape retention of the nonwoven fabric, and is practically used as a disposable body warmer. The problem was likely to occur.

As a method for improving laminating properties, for example, Patent Document 5 proposes a method in which a low melting point resin film is applied to the fiber surface on one side of a nonwoven fabric. In this method, it is necessary to add a complicated coating process, and cost increase is inevitable. In addition, the problems of flexibility, heat sealability and heat resistance of the nonwoven fabric itself have not been solved.

For example, Patent Documents 6 to 8 propose a method in which a thermal adhesive component is made into a fiber and laminated as a method for improving shape retention by improving laminating properties. In these methods, since the low melting point component is made into a fiber, lamination at a low temperature is possible, but there is a problem that the heat resistance is inferior.

Similarly, Patent Document 9 proposes a laminated nonwoven fabric excellent in low-temperature sealing property using a low-melting fiber nonwoven fabric and a low-melting film. In this method, the low temperature sealing property is improved, but the problem of insufficient heat resistance of the nonwoven fabric remains.

As a method for improving flexibility, for example, Patent Documents 10 and 11 propose a method in which flat cross-section fibers are used as fibers constituting the nonwoven fabric. In these methods, as an advantage other than the improvement in flexibility, since flat cross-section fibers are used, the smoothness of the nonwoven fabric is improved, the printability is improved, and the effect of reducing the thickness and improving the heat transfer is disclosed. ing. Certainly, when flat cross-section fibers are used, the bending rigidity decreases in the direction where the cross-sectional secondary moment is low, but the rigidity increases remarkably in the direction where the cross-sectional secondary moment is high, and it is difficult to provide flexibility in all directions. It is. Furthermore, the softness derived from the thickness cannot be imparted by flattening. Accordingly, there is a problem that a paper-like contact feeling is obtained and a soft texture cannot be imparted.

As a method for improving the flexibility of the nonwoven fabric, for example, Patent Document 12 proposes a method of imparting a soft texture using stretchable polytrimethylene terephthalate, and Patent Document 13 discloses an amorphous material for polybutylene terephthalate. A method has been proposed in which a functional polyester is blended to reduce the modulus of the material and to impart softness and heat sealability. In these methods, the flexibility is improved, but since the fibers are soft, there remains a problem that the strength of the nonwoven fabric is weak and easily broken.

As described above, the improvement of conventional packaging materials for disposable warmers has not yet obtained a material that satisfies all of the flexibility, wear resistance, shape retention, and heat sealability of the nonwoven fabric.

Japanese Utility Model Publication No. 51-23769 Japanese Utility Model Publication No. 55-59616 JP-A-2-297362 Japanese Patent Laid-Open No. 3-1856 Japanese Patent Laid-Open No. 9-300547 JP-A-8-131472 Japanese Patent Laid-Open No. 10-314208 JP-A-10-328224 Japanese Patent Laid-Open No. 11-56894 JP 2004-24748 A Japanese Patent Laid-Open No. 2004-24749 JP 11-89869 A JP 2007-105163 A

The present invention was devised in view of the current state of the prior art, and its purpose is to provide a long-fiber non-woven fabric suitable for a disposable warmer base fabric that is excellent in flexibility, abrasion resistance, and shape retention. It is to provide.

As a result of intensive studies to achieve the above object, the present inventors have found that the above problems can be solved by the following means, and have completed the present invention. That is, the present invention is as follows.
1. A pair of sculpture rolls / flat rolls manufactured by a spunbond method in which molten polymer is discharged from an orifice, thinned and drawn by pulling with a high-speed air flow, and fibers are dispersed on a net-like conveyor to form a sheet. In the thermocompression bonding type spunbonded nonwoven fabric obtained by heating and pressure bonding, the nonwoven fabric is composed of long fibers containing 95% or more of polyethylene terephthalate and having a birefringence of 0.07 to 0.12. A long-fiber non-woven fabric having a KES bending rigidity of 0.05 to 0.30 gf · cm ² / cm and a non-woven fabric wear resistance rating of the following formulas (1) to (3).
E1 ≧ 3 (1)
E2 ≧ 1 (2)
E1-E2 ≧ 1 (3)
E1: Abrasion resistance grade of the embossed surface of the nonwoven fabric E2: Abrasion resistance grade of the non-embossed surface of the nonwoven fabric With respect to polyethylene terephthalate (component A), a thermoplastic polystyrene copolymer (component B) that is incompatible with component A and has a glass transition temperature of 120 to 160 ° C. is used in an amount of 0.05 to 4. 2. The long fiber nonwoven fabric according to 1 above, comprising a long fiber made of polyester obtained by mixing 0% by weight.
3. 3. The long fiber nonwoven fabric according to 1 or 2 above, wherein the area ratio of the thermocompression bonding portion is 5 to 30%.
4). 4. A film composite in which the non-embossed surface of the nonwoven fabric according to any one of 1 to 3 is bonded to a film.
5. 5. Packaging material using the film composite according to 4 above. Disposable body warmers using the film composite according to 4 above.

The long-fiber non-woven fabric of the present invention is a non-woven fabric excellent in heat sealability because it retains mechanical properties capable of maintaining flexibility, abrasion resistance, and durability sufficient for maintaining the shape, and is easy to deform during heating. is there. Therefore, the long-fiber nonwoven fabric of the present invention can be used even if the film laminate is omitted particularly for the disposable warmer base fabric, so that a warmer can be produced without impairing the flexible texture, and can contribute to performance and cost reduction. This is a very useful long-fiber nonwoven fabric for a Cairo base fabric.

It is a cross-sectional photograph of the thermocompression bonding part of the conventional nonwoven fabric. It is a cross-sectional photograph of the thermocompression bonding part of the nonwoven fabric of this invention.

The long fiber nonwoven fabric of the present invention is a thermocompression bonding spunbond nonwoven fabric. Short fiber nonwoven fabrics are not preferred because the fiber ends cause fuzz. In the long-fiber non-woven fabric, fluff does not occur unless the fiber is cut. Therefore, in the present invention, a non-woven fabric composed of long fibers is used. There are various methods for producing a long-fiber nonwoven fabric, but a spunbonded nonwoven fabric was selected because it is easy to control mechanical properties by high-speed spinning and has high productivity.

The long fiber nonwoven fabric of the present invention contains 95% by weight or more of polyethylene terephthalate. Polyethylene terephthalate is a general-purpose polymer excellent in thermal and mechanical properties, and it can be used as a main raw material to provide a low-priced product.
In this invention, it is also preferable to use B component together with polyethylene terephthalate (A component). As the B component, a preferable thermoplastic resin includes a thermoplastic polystyrene copolymer. The B component is not compatible with the A component, so that it has the property of being independently present as an island component in the A component, and has a specific glass transition temperature higher than the glass transition temperature of the A component, which is a sea component. By setting it as the point temperature, the B component exhibits the effect of suppressing the oriented crystallization of the polyester under the spinning tension. Examples of the component B include a styrene-methyl methacrylate-maleic anhydride copolymer resin having a glass transition temperature of 122 ° C. (commercially available product, for example, Plexiglas hw55 from Rohm GmbH & Co. KG) and a glass transition at 155 ° C. A styrene-maleic anhydride copolymer resin having a point temperature (in the case of a commercial product, for example, SMA1000 manufactured by SARTOMER) is particularly preferable since a high effect of suppressing orientational crystallization can be expected with a small addition amount. Note that if the glass transition temperature of the B component is less than 120 ° C., the effect of suppressing orientation crystallization is reduced, which is not recommended in the embodiment of the present invention. Further, by adding the component B, the degree of orientation can be suppressed while being a drawn yarn, and both the balance between flexibility and wear resistance can be achieved.

In the polyester of the present invention, the mixing ratio of the B component to the A component is preferably 0.05 to 4.0% by weight, more preferably 0.08 to 3.0% by weight, still more preferably 0.1 to 1%. .5% by weight. When the amount of the B component is less than 0.05% by weight, the effect of suppressing orientation crystallization is reduced, the degree of orientation and specific gravity of the fiber are increased, and flexibility and heat sealability are deteriorated. When the mixing amount exceeds 4.0% by weight, yarn breakage becomes noticeable during high-speed spinning, and spinning becomes impossible. In a low-speed spinning region where yarn breakage does not occur, only fibers with a very low degree of orientation can be obtained, and a weak nonwoven fabric. In addition, it is not preferable because it is not only obtained but also inferior in productivity.

The birefringence of the long fibers constituting the nonwoven fabric of the present invention is 0.06 to 0.12. When the birefringence is less than 0.06, the mechanical properties are inferior, and the abrasion resistance and the shape maintaining performance are inferior. If it exceeds 0.12, the rigidity increases and the texture as a non-woven fabric is also impaired. The birefringence of the present invention is more preferably 0.07 to 0.10.

The long fiber nonwoven fabric of the present invention is a thermocompression bonding nonwoven fabric. It is not preferable to perform a process in which the constituent fibers are entangled in the cross-sectional direction of the nonwoven fabric by a process such as a needle punch entanglement process or a water flow entanglement process, even if long fibers are used, the fibers are easily cut and fluffed. In addition, the number of man-hours is increased compared to the thermocompression bonding type, and the amount of energy used and the loss of raw materials are increased.
The term “thermocompression bonding nonwoven fabric” as used herein refers to a partial thermocompression bonding (embossing) nonwoven fabric using a pair of engraving rolls / flat rolls. In the case of full-surface thermocompression bonding (calendar processing), if thermocompression bonding covers the entire surface, the entire surface is formed into a film and flexibility is not preferred.

In this invention, in order to satisfy a softness | flexibility and abrasion resistance with a partial crimping | compression-bonding type nonwoven fabric, it thermocompression-bonds on conditions different from normal thermocompression-bonding process conditions. One engraved roll of the pair of thermocompression-bonding rolls is a thermocompression-bonding roll engraved with a convex pattern, and the other is a thermocompression-bonding roll having a flat surface. Furthermore, the temperature of the engraved roll surface needs to be set to 200 ° C. to 260 ° C., and the temperature of the flat roll surface needs to be set to 100 ° C. to 180 ° C.
By setting one side at a high temperature and setting the other side at a low temperature within the above temperature range, it is possible to obtain for the first time a nonwoven fabric that maintains a certain level of wear resistance while suppressing the texture to a soft level. .

The long fiber nonwoven fabric of the present invention is a nonwoven fabric characterized by a thermocompression bonding portion by performing the above-described thermocompression processing. That is, the thermocompression bonding part of the long-fiber nonwoven fabric of the present invention has a structure as shown in FIG. 2 with respect to the thermocompression bonding part processed under the conventional thermocompression bonding conditions as shown in FIG. That is, on the embossed surface side, the fibers on the surface side are heat-melted during thermocompression bonding, and the fibers are fused and integrated into a film, whereas the anti-embossed surface (the other surface) side is on the surface side. Has a structure in which only a part of the fiber is melted by heat and the fiber part is melted and integrated. As a result, a long-fiber nonwoven fabric satisfying both flexibility and wear resistance was obtained for the first time.

The preferred crimp area ratio in embossing is 5-30%. If the crimping area is less than 5%, the fibers cannot be sufficiently fixed to each other, leading to a decrease in tensile strength and a decrease in wear resistance. On the other hand, if the crimping area ratio exceeds 30%, the fibers cannot follow the deformation with respect to the bending of the nonwoven fabric, resulting in a hard texture.

The KES bending rigidity of the long-fiber nonwoven fabric of the present invention is preferably 0.05 to 0.30 gf · cm ² / cm. When the flexural rigidity is less than 0.05 gf · cm ² / cm, the base fabric is too soft and inferior in handleability. Further, if the bending rigidity exceeds 0.30 gf · cm ² / cm, the flexibility is inferior and the texture becomes poor, such being undesirable. The KES bending rigidity is more preferably 0.05 to 0.25 gf · cm ² / cm, and further preferably 0.08 to 0.20 gf · cm ² / cm.

The abrasion resistance of the long-fiber nonwoven fabric of the present invention satisfies the following formulas (1) to (3).
E1 ≧ 3 (1)
E2 ≧ 1 (2)
E1-E2 ≧ 1 (3)
E1: Abrasion resistance grade of embossed surface of nonwoven fabric, E2: Abrasion resistance grade of non-embossed surface of nonwoven fabric

The long fiber nonwoven fabric of the present invention has an embossed surface with an abrasion resistance grade of 3 or more. This is because when the abrasion resistance grade is less than 3, fluffing occurs when friction by hand is given, which not only looks good but also causes a decrease in strength of the nonwoven fabric.
Moreover, the non-woven fabric of the present invention has an anti-embossed surface (the other surface) having an abrasion resistance rating of 1 or more. This is because when the abrasion resistance grade is less than 1, the process passability during the production of the nonwoven fabric or the subsequent production of the product is significantly reduced.
Furthermore, the long-fiber nonwoven fabric of the present invention has a wear resistance rating of the embossed surface of the anti-embossed surface (the other surface) of 1 or more. The anti-embossed surface is not touched by hands, and a wear resistance grade is not required.

In addition, when the nonwoven fabric is laminated with a film in the present invention, the non-embossed surface of the nonwoven fabric and the film are laminated. This is because even if the abrasion resistance grade is low, the film is protected against abrasion, so even a low value is not a problem. Lamination with a film is an extrusion lamination method in which a semi-molten film is directly extruded onto a non-woven substrate or a lamination method using an adhesive (“wet lamination” (water-based adhesive or water-dispersed adhesive depending on the type of adhesive) Used), “dry laminate” (solvent adhesive or reactive adhesive), and “hot melt laminate” (hot melt adhesive)))), but can be used only for this purpose. It is not something. Further, by adhering the anti-embossed surface of the nonwoven fabric of the present invention and the film, a result that the adhesive force is improved more than when the conventional nonwoven fabric is adhered is obtained. This is considered to be because the anchoring effect of the film resin was improved in the extrusion lamination, and the permeability of the adhesive was improved in the adhesive method.

The fineness of the long fibers constituting the nonwoven fabric of the present invention is not particularly limited, but is preferably 0.5 to 5 dtex which can maintain the covering property and flexibility. 1 to 4 dtex is more preferable, and 1.5 to 3 dtex is more preferable.

The cross-sectional shape of the long fibers constituting the nonwoven fabric of the present invention is not particularly limited, and a round cross section, an irregular cross section, a hollow cross section, and a hollow cross section can be used, but a round cross section is preferable from the viewpoint of flexibility.

Basis weight of the nonwoven fabric of the present invention is not particularly limited, when used as a base fabric for disposable body warmer, preferably 15 ~ 60g / ^{m 2} in terms of flexibility and coverage, and more preferably 20 ~ 50g / ^{m 2,} 25 More preferred is ˜40 g / m ² .

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. The characteristics described in the examples are evaluated by the following method.

(Birefringence)
The average value of n = 5 obtained from the single fiber taken out from the nonwoven fabric or the web by the retardation microscope and the fiber diameter with a deflection microscope equipped with a Berek compensator was defined as the birefringence (Δn) of the fiber.

(Nonwoven fabric crimping area ratio)
Cut into 30mm squares at any 20 locations and take 50x pictures with SEM. The photographed photograph is printed in A3 size, and the unit area of the crimping is cut out to obtain the area (S ₀ ). Next, only the crimping part is cut out within the crimping unit area, the crimping part area (S _p ) is obtained, and the crimping area ratio (P) is calculated. The average value of the crimping area ratio P of 20 points was determined.
P = S _p / S ₀ (n = 20)

(Bending stiffness of nonwoven fabric)
Using a KES-FB2 (KAWABATAS EVALUATION SYSTEM-2 PURE BENDING TESTER) manufactured by Kato Tech Co., Ltd., the sample is 10 cm square, the sample is held on a chuck with a 1 cm interval, and the curvature is -2.5 to +2.5 cm ^-1 In the range, a pure bending test was performed at a deformation speed of 0.50 cm ⁻¹ to obtain the bending rigidity (B).

(Abrasion resistance of nonwoven fabric)
Using "Gakushin dyeing friction fastness tester" manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd., using a nonwoven fabric as a sample, using a gold cloth No. 3 as a friction cloth, using a load of 500 gf, and having 100 cycles of friction. Then, the surface of the nonwoven fabric was fluffed and was worn and evaluated by visual judgment based on the following criteria (average value of n = 5).
Level 0: High damage Level 1: Damaged Level 2: Small damage Level 3: No damage, small fluff generation Level 4: No damage, fluff generation micro Level 5: No damage, no fluff

(Glass transition temperature and melting point)
A 5 mg resin sample was taken, and the temperature of the exothermic peak position when the temperature was raised from 20 ° C. to 300 ° C. at 10 ° C./min under a nitrogen atmosphere by a differential scanning calorimeter (TA instruments Q100). The glass transition temperature and the temperature at the endothermic peak position were evaluated as melting points.

(Nonwoven fabric weight)
The mass per unit area measured according to JIS L1906 (2000) was defined as the basis weight (g / m ² ).

(Fineness)
The fibers constituting the non-woven fabric are sampled from arbitrary 5 locations, and 20 fibers are selected from each location by an optical microscope to evaluate the single fiber diameter (100 in total). The average value of the fiber diameters is defined as the fiber diameter of the constituent fibers. Moreover, the specific gravity of the fiber sampled from arbitrary 5 places was measured with the density gradient tube, and the average value was calculated | required. The fineness was determined from the fiber diameter and density. In addition, when it is difficult to obtain the fiber diameter due to the atypical cross section, the fiber cross section is obtained from the SEM photograph.

<Example 1>
Using spunbond spinning equipment, polyethylene terephthalate (hereinafter referred to as PET) with an intrinsic viscosity of 0.62, using a nozzle with a nozzle orifice of L / D = 3.0, spinning temperature of 295 ° C., single-hole discharge rate of 0.7 g / min And spinning at a spinning speed of 5000 m / min and depositing on a net conveyor to obtain a long fiber web having a fineness of 1.8 dtex. Next, using an embossing roll with a pressure bonding area ratio of 22%, the long fiber nonwoven fabric with a basis weight of 35 g / m ² is pressure-bonded at an embossing roll surface temperature of 250 ° C., a flat roll surface temperature of 150 ° C., and a linear pressure of 30 kN / m. Got. The obtained nonwoven fabric was a nonwoven fabric excellent in flexibility and wear resistance. The details of the obtained nonwoven fabric are shown in Table 1.

<Example 2>
Example 1 except that 0.4% of styrene-methyl methacrylate-maleic anhydride copolymer resin (PLEXIGLAS HW55 (Rohm GmbH & Co. KG) (hereinafter referred to as “HW55”)) was added to polyethylene terephthalate. Thus, a long fiber nonwoven fabric was obtained. The obtained nonwoven fabric was a nonwoven fabric excellent in flexibility and wear resistance. The details of the obtained nonwoven fabric are shown in Table 1.

<Example 3>
A long-fiber nonwoven fabric was obtained in the same manner as in Example 2 except that the speed of the conveyor net was adjusted so that the basis weight was 40 g / m ² . The obtained nonwoven fabric was a nonwoven fabric excellent in flexibility and wear resistance. The details of the obtained nonwoven fabric are shown in Table 1.

<Example 4>
A long fiber nonwoven fabric was obtained in the same manner as in Example 2 except that the amount of HW55 added was changed to 0.8%. The obtained nonwoven fabric was a nonwoven fabric excellent in flexibility and wear resistance. The details of the obtained nonwoven fabric are shown in Table 1.

<Example 5>
A long fiber nonwoven fabric was obtained in the same manner as in Example 4 except that the embossed crimp area ratio was changed to 11%. The obtained nonwoven fabric was a nonwoven fabric excellent in flexibility and wear resistance. The details of the obtained nonwoven fabric are shown in Table 1.

<Comparative Example 1>
A long fiber nonwoven fabric was obtained in the same manner as in Example 1 except that both the embossing roll surface temperature and the flat roll surface temperature during embossing were changed to 250 ° C. The obtained non-woven fabric had good wear resistance, but had high KES bending rigidity, and had a poor texture as a warmer base fabric.

<Comparative example 2>
A long fiber nonwoven fabric was obtained in the same manner as in Example 1 except that both the embossing roll surface temperature and the flat roll surface temperature during embossing were changed to 190 ° C. The obtained non-woven fabric had good flexibility, but had low wear resistance and had a problem in use as a warmer.

The long fiber nonwoven fabric of the present invention is excellent in flexibility and wear resistance, and can provide a long fiber nonwoven fabric suitable as a base material to be used in a bag shape. More specifically, it is possible to provide a long-fiber nonwoven fabric that is particularly suitable for a disposable warmer base fabric.

Claims

A pair of engraving rolls / flat rolls manufactured by a spunbond method in which molten polymer is discharged from an orifice, drawn and pulled by a high-speed air stream, and thinned and stretched, and the fibers are dispersed on a net conveyor to form a sheet. In the thermocompression-bonded spunbonded nonwoven fabric obtained by heating and pressure bonding, a nonwoven fabric composed of long fibers containing 95% or more of polyethylene terephthalate and having a birefringence of 0.07 to 0.12, A long-fiber non-woven fabric having a KES bending stiffness of 0.05 to 0.30 gf · cm 2 / cm and a non-woven fabric wear resistance rating of the following formulas (1) to (3):
E1 ≧ 3 (1)
E2 ≧ 1 (2)
E1-E2 ≧ 1 (3)
E1: Abrasion resistance grade of embossed surface of nonwoven fabric, E2: Abrasion resistance grade of non-embossed surface of nonwoven fabric
With respect to polyethylene terephthalate (component A), a thermoplastic polystyrene copolymer (component B) that is incompatible with component A and has a glass transition temperature of 120 to 160 ° C. is used in an amount of 0.05 to 4. The long-fiber non-woven fabric according to claim 1, comprising a long-fiber made of polyester obtained by mixing 0% by weight.
The long fiber nonwoven fabric according to claim 1 or 2, wherein the area ratio of the thermocompression bonding portion is 5 to 30%.
A film composite in which the non-embossed surface of the nonwoven fabric according to any one of claims 1 to 3 is bonded to a film.
Packaging material using the film composite according to claim 4.
A disposable body warmer using the film composite according to claim 4.