JPS60199958A - Bulky nonwoven fabric having elasticity - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a polyethylene terephthalate long fiber nonwoven fabric. More specifically, the present invention relates to a bulky nonwoven fabric that has a dense fiber density, is highly elastic, and has improved elongation anisotropy in response to external forces.

<Prior art> In general, span d? It is known that needle-punching a long fiber web is used to obtain a bulky nonwoven fabric, but unlike short fibers, a long fiber web poses various problems. have For example, local movement is restricted due to the long fibers, causing up and down,
Moreover, it is difficult to be randomly intertwined. For this, the fiber density (
Even if an attempt was made to obtain a bulky nonwoven fabric by lowering the amount of fiber per unit volume, it would not be possible to obtain a bulky nonwoven fabric.However, if the number of needle punches is increased to strengthen entanglement, the fibers will be cut and the strength will decrease. A problem occurs. In the case of short fiber web formation, it is easy to arrange the fibers randomly in each direction, whereas in the case of long fiber webs such as the Su-Mandand method, this is relatively difficult due to the manufacturing method. be. vinegar·
The strength and elongation of nonwoven fabrics produced by the gutter method usually vary greatly depending on the direction. Generally, the strength in the vertical direction (machine direction) is υ larger than in the horizontal direction,
The vertical/horizontal break @ strength ratio due to the anisotropy of the fiber arrangement is usually 2 to 3. On the other hand, the elongation at break tends to show a high value in the horizontal direction, where the strength is weak. Even if needle punching is performed on the current non-woven fabric, the interlacing is not sufficiently improved, and when the number of punches is increased to strengthen the interlacing, strength decreases due to breakage of the front six threads, and in some cases It has large voids and has further expanded anisotropy. In other words, it has a primitive structure as a nonwoven fabric structure and has poor elastic recovery.

In general, nonwoven fabrics that are easily stretchable in both the vertical and horizontal directions, or conversely, those that are difficult to stretch in both the vertical and horizontal directions are preferable because they can be used for various purposes. On the other hand, materials that stretch in either the vertical or horizontal direction and are difficult to stretch in the other direction are not preferred except for specific uses.

Recently, materials with a dense structure and high elasticity have been developed, such as vertical and
There is a desire for nonwoven fabrics that are equally stretchable in both the horizontal and horizontal directions. However, if the external force during use is relatively small,
Same elongation in both vertical and horizontal directions (Young's modulus is large)
, when applying large external forces such as molding, vertical,
What is desired is something that stretches to the same extent both in the horizontal direction. It has been extremely difficult to provide such physical properties with long fiber nonwoven fabrics made by artisans for the reasons mentioned above. In order to obtain a nonwoven fabric with such properties, we focused on the crimp or shrinkage behavior of the fibers and received +4! ] We examined the advantages of these first fibers for MC purposes. A long-fiber web using a laminated composite fiber with a polyester copolymer as a latent crimped long fiber was subjected to needle and punch processing to produce a nonwoven fabric, which was then crimped by heat treatment. In this case, the bulkiness increased, but it was easy to stretch against external forces, and the anisotropy was not sufficiently improved.

On the other hand, a conventionally known web made of undrawn polyethylene terephthalate long fibers with a high heat shrinkage rate was similarly processed into a two-dored 9-inch nonwoven fabric, which was then shrunk (due to heat treatability). In this case, a nonwoven fabric with a dense structure was obtained by shrinkage, but the fibers became stiff and had a hard texture.

The present inventors have improved the disadvantages of the above-mentioned undrawn polyethylene terephthalate long fiber nonwoven fabric, namely, hardening of the texture due to stiffening of the fibers during heat shrinkage, and heat deterioration when coming into contact with high-temperature objects. In order to obtain the nonwoven fabric that is the object of the present invention, we conducted extensive research, and as a result, we determined that the crystallinity and orientation of the outer periphery of the cross section of the single fibers constituting the undrawn polyethylene terephthalate long fiber nonwoven fabric, and the crystallinity and orientation of the central part. We have discovered that the above object can be achieved by making it larger, and have arrived at the present invention.

<Objective of the Invention> An object of the present invention is to provide a polyethylene terephthalate fiber-based, bulky nonwoven fabric that has a dense fiber density, is rich in elasticity, and has improved elongation anisotropy against external forces.

<Constitution of the Invention> The purpose of the present invention is to use a filament having a fineness of 0.5 denier or more, a particle collection rate of 15 μ or more, a 4R8 density of 80 μ or more, and an elastic return rate of 50% or more. A non-woven fabric whose constituent fiber cross section has a circular cross section with radius R, and the average refractive index at the center is 0.8R from the center.
If the average refractive index at the distance of (0)1 is n11(.,8), then 1.60
≦n11. . , ≦1.67 and (nll(o, a)
This is achieved by a nonwoven fabric made of a polyethylene terephthalate long fiber entangled body, which satisfies n1l(o))≧5×10 .

Specific explanation of the structure> The polyethylene terephthalate long fiber nonwoven fabric of the present invention has 1
It is a nonwoven fabric having a partially interwoven fabric with a shrinkage rate of 5% or less and a breaking elongation of 70% or more at 50°C.

In the present invention, polyethylene terephthalate may be used in addition to a small amount of 7-1 yeast insects σ) Hokurai A d ° Sho-1 □ 1. 4? May include Lima. Additionally, additives commonly used for polyethylene terephthalate, such as matting agents, antistatic agents, flame retardants,
A pigment or the like may be included. Furthermore, the unstretched J? Polyester fibers, polyester fibers with different degrees of stretching, and other fibers (e.g. polyamide,
Fibers such as polyolefin) may be used in a laminated or mixed manner within a range that does not impair the purpose of the present invention.
．． 60≦n11 (.,≦1.67 and conditions) (nl
There is a % sign that l(o,s)''(0))≧5X10-' is satisfied.Condition CB) means that the outer layer of the fiber cross section is highly oriented and highly crystalline9, while the center is the opposite. This means that the orientation and crystallinity are lower than that of the outer layer.In this case, the crystallinity and orientation gradually increase from the center toward the outer layer, with extremely thick values slightly inside the surface. The structure has
It is thought that the formation of the fiber structure contributes to improvements in preventing stiffening of the fibers due to heat and reducing thermal deterioration. Thermal deterioration as used in the present invention refers to a decrease in strength and elongation at break after thermal history due to pressurized and heated contact with a heated object such as a press or a mold during thermoforming. In the fibers constituting the nonwoven fabric of the present invention, condition C
If B) is satisfied and n1l(.) is 1.60 or less, the nonwoven fabric is extremely brittle and has poor practicality. Also, n
If 11 is 1.67 or more, it is impossible to obtain a nonwoven fabric which is rich in elasticity and has improved anisotropy of elongation with respect to external force, which is the objective of the present invention (0). In the present invention, the condition (4) is further satisfied, and the larger n1l(., 8) is, that is, the larger the orientation and crystallinity of the outer circumference, the more the fibers become stiff due to heat. This is preferable because it prevents thermal deterioration and improves thermal deterioration.

Furthermore, in the Nti fibers in the nonwoven fabric of the present invention, the local average refractive index distribution varies from the center of the single fiber cross section to 0.
．． The average refractive index (all(.,
8) or "II (-0, 8)). If the local average refractive index distribution of the fiber is symmetrical with respect to the center of the fiber, the thermal This is preferable in order not to reduce deterioration, and there are few irregularities in strength and elongation.Here, the fact that the local average refractive index distribution is symmetrical with respect to the center of the fiber means that the minimum value of the average refractive index is (n1l(
. , 10 x to ) or more, and nll(g,
6) The difference between (-0,8) and all 10XIO"-' or less, preferably 5 X 10-'
3 or less.

The nonwoven fabric of the present invention is obtained by subjecting a long fiber web to needle and arm punch processing, and then heat shrinking it to increase the degree of intertwining of the fibers. The degree of entanglement of the fibers before heat shrinking is such that the two-dimensional dispersion state of the fibers already obtained when spinning to form a web is further processed with 4-inch needle milling to strengthen the entanglement in the vertical and horizontal directions. However, this alone cannot provide a structure with sufficient fiber density.

The nonwoven fabric of the present invention is obtained by heat-shrinking a needle-punched nonwoven fabric to eliminate or reduce voids in the structure, and the fiber density is improved, resulting in a nonwoven fabric with a dense structure.

As a result, the nonwoven fabric of the present invention has a particle collection rate of 15μ or more of 8
The fiber density was 0% or more and the elastic recovery rate was 50% or more.

In this specification, the anisotropy of the nonwoven fabric is defined as the direction tDs in which the breaking strength of the nonwoven fabric is large, and the direction perpendicular to this direction is D2.
Let the respective stresses at the same elongation in the direction of Dl or D2 be expressed by the stress ratio σD/σ0 where σ and σ are the same and the stress ratio is σD/σ0.

2 The nonwoven fabric of the present invention is characterized in that the MfJ 8b anisotropy decreases due to thermal ablation, and its value is in the elongation region i.

It is 0.8 to 3.0 within a range of 30% from H, and preferably 0.8 to 2.0.

Next, typical manufacturing examples of the nonwoven fabric of the present invention will be specifically described with reference to the accompanying drawings.

In FIG. 2, a group of filaments 15 discharged from a spinneret 11 are advanced by an air sucker 12 and pulled by an air current, and a web 16 is conveyed on a moving conveyor net 13.
This figure shows how it is formed. That is, in order to obtain the undrawn polyethylene terephthalate fiber having the two-layer structure of the present invention, it is necessary to finish the drawing process in a relatively short distance immediately after spinning.
2 within 1,000 m, preferably 800 m
In addition, at a position within 400 meters directly below the spinneret, cold air at a temperature of 20°C or less, preferably 15°C or less is blown from both sides of the filament group at a rate of at least 0.5 m/sec/ from the cold lice chamber 14. It is necessary to blow at higher speeds.

What is more important than this is the length L of the cold air blowing zone.
is at least 50!1111 or more, and the spray angle θ to the filament group is 2O2 or more and 50° or less, preferably 30° or more and 40° or less. It is necessary to blow cold air uniformly from both sides of the filament group in order for the local average refractive index distribution of the present invention to be symmetrical with respect to the center of the fiber, and without disturbing the filament group. At the same time, the wind speed and blowing angle are selected in order to cool the outer filament near the cold air and the central filament located far away to the same degree.

As described above, the filaments constituting the nonwoven fabric of the present invention are rapidly drawn during cooling immediately after spinning, so that the outer layer is rapidly cooled and the crystallinity and molecular orientation become larger than the center. It is considered that the invention has a two-layer structure.

At this time, under the manufacturing conditions of the present invention, the spinning speed,
It is necessary to mutually adjust the discharge angle, pressure angle, spinneret diameter, number of spindle holes, etc. In addition, the angle and speed of the cold air blowing are adjusted to make the circumference of each filament uniform.
Moreover, it is important to cool them to the same degree.

Next, the thus obtained polyethylene terephthalate long fibers of the present invention are taken out onto an endless wire gauze to form a web using a known method.

Under the above manufacturing conditions, the refractive index at the center of the single fiber cross section is nll
≦1.64, and (nll n1l(.))≧(0)
A fiber satisfying (0,8) 5 x 10-' is spun, and the nonwoven fabric of the present invention is manufactured using this fiber. This fiber web is taken out by a known method and subjected to needle gunch processing. In order to prevent the web from being disturbed during needle/centimeter processing, thermocompression bonding is preferably carried out at a temperature of 100° or less using an enrN throttle having convex portions on the surface. However, this thermocompression bonding may be omitted. Needle punching can be performed by a known method and is not particularly limited, but the number of punches is 50 times/an or more, preferably ioo times/an.
2 or more, 7 people 500 times.

Next, this needle/pinch processed nonwoven fabric is heat-shrinked. In this case, the temperature is 70°C or higher and 2oC.

The reaction is carried out at a temperature of C or lower, preferably at a temperature of 100°C or higher and 180°C or lower, within 60 seconds.

The degree of heat shrinkage during processing is at least 5% or more, preferably 10% to 50cm, in the vertical and horizontal directions.

Heat shrinkage is performed using a tenter, cylinder, or loop dryer. Further, if necessary, tentering processing and surface smoothing processing are performed at a temperature of 150° C. or less. Furthermore, after heat shrinking, heat engessing processing may be performed at a temperature of 150° C. or higher to pattern the surface. These treatments such as tentering, smoothing, and engossing can be carried out because the nonwoven fabric of the present invention has less thermal shrinkage and less thermal deterioration.

In addition, in the present invention, the fineness of the fibers constituting the nonwoven fabric is 5.
It is less than 0 denier, preferably from 0.5 to 30 denier. The fibers may be a mixture of fibers from the same or different seeds.

Furthermore, the nonwoven fabric with a b value of 10 to 500v2 is preferably used, but is not limited thereto. Further, if necessary, a small amount of a processing agent such as an adhesive, an antistatic agent, a flame release agent, a mold release agent, etc. may be applied by a known method.

Is this how you got it? In the polyethylene terephthalate long fiber nonwoven fabric, the constituent single fibers have low crystallinity in the center in cross section, and have high orientation and high crystallinity in the outer periphery. For this reason, the nonwoven fabric of the present invention is less prone to stiffening and thermal deterioration even if it is heat-shrinked. The nonwoven fabric of the present invention had a large fibrous bitter melon structure due to heat shrinkage. As a result, the size of the void and its area became smaller, and the elastic modulus improved. In addition, good elongation isotropy was obtained under external force. As a result, in the vertical and horizontal directions, a nonwoven fabric was obtained that was difficult to stretch statically when the external force was small, but was easy to stretch statically when the external force was large.

Since the nonwoven fabric of the present invention is configured as described above, it has high quality as a felt substitute and can be widely used in inch rear applications.

<Effects and Disadvantages of the Invention> As mentioned above, the nonwoven fabric produced by Hontsuramei is a polyethylene prephthalate long fiber bulky nonwoven fabric that has a dense fiber density, is rich in elasticity, and has improved elongation anisotropy against external forces. It is. Therefore, this yuzu woven fabric can be used in fields where it could not be used conventionally due to its performance and exhibits excellent performance.

Example The present invention will be specifically described below with reference to Examples.

The definitions and measurement methods of the characteristics described in the Examples are shown below.

average refractive index (n11・nl), and average birefringence observed from the side of the fiber by the interference fringe method using a transmission quantitative interference microscope (for example, interference microscope Interfaco manufactured by Carl Zeiss Jena, East Germany). The distribution of rates can be measured. This method applies to fibers with a circular cross section.

The refractive index of a fiber is characterized by a refractive index nll for polarized light with an electric field vector parallel to the fiber axis and a refractive index n1 for polarized light with an electric field vector perpendicular to the fiber axis.

All measurements explained here are performed using green light (wavelength λ = 549m).
μ).

For the fibers, an optically flat slide glass and cover glass are used, the refractive index (N) is set to M to provide a shift in interference fringes within the range of 02 to 2 wavelengths, and the fibers are placed in a mounting medium that is inert to the fibers. immersed in. Several fibers are immersed in this encapsulant so that the single threads do not touch each other. 4 more J
The A-fiber should be such that its a-axis is perpendicular to the optical axis of the interference microscope and the interference fringes. This interference fringe pattern is photographed, magnified approximately 1,500 times, and analyzed.

As shown in FIG. 1, the refractive index of the encapsulant of the fiber is determined by the refractive index n1l (also nl) between the point key S'' on the outer periphery of the N1 fiber,
It is expressed by the thickness χ between S/ and B'', the wavelength of the used light beam by λ, and the interval between the parallel stripes of the back ground (corresponding to lλ).

When the radius of the fiber is R, the refractive index al of the fiber at each position is calculated from the optical path difference at each position from the center Ro of the fiber to the outer periphery R.
The distribution of l (or nl) can be determined. When r is the distance from the center of the fiber to each position, X=r/R=0,
That is, the refractive index at the center of the fiber is the average refractive index (n1l
(o) or nl(0)). X is 1 on the outer circumference
In other parts, the value is in the range of 0-1,
For example, the refractive index at the point X=O,S is n11. . , 8
) (or nl, ., 8)). The difference in the average refractive index (nll) of the fiber between the inner and outer layers is n11(., a) - nll(.

, is expressed as . Moreover, the average refractive index n11. . , exclaimed. ,
The average birefringence index (Δn) is expressed as Δn=n1l(.) - weight (0). Take a test piece of 20 cy++ x 20 cm, measure its weight, and convert it to the basis weight.

◎Measure at least three points using a dial r-no with a thickness load of 1001//m, and express the average value.

■Bulkiness The trough of the unit weight is determined from the above basis weight and thickness values and is expressed as bulkiness.

◎Tensile strength and elongation test piece 3 cm x 20 cm'k, take at least 3 points each vertically and horizontally, using a constant speed extension type tensile tester, grip interval 10
Measured at a tensile speed of 20 mln to determine strength and elongation. The valleys are expressed as their average values. (Measurement is performed in the same manner in an atmosphere of 150°C.) ◎For the measurement of bending resistance and texture, the bending resistance is measured using the 45° cantilever method. (JIS-L-1079A method) ◎Take a heat shrinkage rate sample of 25cIn
Place it in a hot air dryer for 1 minute, calculate the shrinkage rate from the change in dimensions, and express it as the average value.

◎Elastic recovery rate sample 3cTn x 20crIK was gripped vertically and horizontally using a constant speed extension type tensile tester at a gripping interval of 1ocrn.
.

2.0 kg73 at tensile speed 10 cwr/ml n
cm After applying a constant load for 1 minute, calculate the elastic recovery rate from the dimensional change of the test piece 5 minutes after the load is removed. Toe 9,
The length before applying the load is LOs When the load is applied tls The length after nail removal is t2.

2 Elastic recovery rate = -xioo (a) t.

◎Thermal deterioration Indicates thermal deterioration due to contact with a heated object. That is, using a pair of smooth rolls, the upper and lower temperatures were 150°C and the linear pressure was 20k.
Pressure heating contact is carried out at g/cfn, and thermal deterioration is calculated from the tensile strength and flange elongation at break before and after thermocompression bonding, and is expressed as an average value.

◎Dust collection rate: 2 of JIS-Z-8901 (Test dust)
Seed dust (silica sand) is blown to 100 m/ml by wind.
The initial ventilation resistance (Δ
PI) to twice the airflow resistance (Δpz) to measure dust collection efficiency. (Amount of dust used VI'1%
Let the amount of collected dust be w2. ) Dust collection rate = -X100 (%) W! ◎ Anisotropic 3m x 2Q crn test - Using a constant speed extension type tensile tester, grip the scissors at 5 points each in the vertical and horizontal directions at a gripping interval i.

Measured at a tensile speed of 20 cm/min, the average breaking strength in each direction is taken as the direction D1 where the value is larger,
Let the direction perpendicular to that be D2. 10.20.3 in the stress-strain curves (5 points each) in each direction obtained at this time
Based on the average stress values σD1 and σD2 at 0% elongation, the value of σD1/σD2 at each offshore length is used as the evaluation standard for anisotropy. In other words, the larger this value is, the greater the anisotropy is.

Margin below Example 10, 20, 30, Comparative Examples 40, 50.

60.70 Three examples of nonwoven fabrics according to the invention (10° 2 cores, 30°
) and four comparative examples (40, 50, 60° 70) are used as an intermediate product, that is, a nonwoven fabric in which the formed web is partially thermocompressed and needle-punched, and a nonwoven fabric according to the present invention, that is, the intermediate product as described above. The physical properties of the constituent fibers and the nonwoven fabric were compared and examined in two states: a nonwoven fabric obtained by heat-shrinking the nonwoven fabric, and a nonwoven fabric obtained by heat-shrinking the nonwoven fabric.

A rectangular spinneret with a pore diameter of 0.25 and 1000 holes was opened, and polyethylene terephthalate with an intrinsic viscosity of 0.75 was spun at a discharge rate of 85,097 m1n at a melting temperature of 290°C, and the distance from the spinneret to the air sucker for indexing (H- A uniform web was collected on a wire mesh by changing the spinning speed as in D). Then, I used an embossing roll with a thermocompression bonding rate of 12%.
The temperature of two flat rolls is 60℃, and the linear pressure is 20k.
After applying hot pressure N at 17/crn, needle punching was performed. This condition is 10017 fibers each.
The intermediate product was obtained using a #40 needle, a punching depth of 15 m, and a number of punches of 300 times/cm.

In this case, cold air at a temperature of 13°C is blown through cold air chambers placed on both sides of the filament group as shown in Fig. 2 at a position 300 ran directly below the spinneret, with a blowing zone length (t) of 7.
0 mm and a blowing angle (θ) of 35°, the cold air was blown uniformly at a speed of 0.8 ml a@c.

Table 1 shows the physical properties of the nonwoven fabric as an intermediate product obtained and the physical properties of the fibers constituting the nonwoven fabric. In Table 1, Examples 1.2 and 3 are Example 1 of the nonwoven fabric of the present invention, which will be described later.
Comparative Examples 4.5 and 6.7 are nonwoven fabrics as intermediate products used in Comparative Examples 40, 50, 60, and 70, respectively. . However, I and D fibers constituting the nonwoven fabric of Comparative Example 4.5.7 were prepared without using cold air.
and ki when a web with a predetermined spinning speed is obtained by appropriately changing the amount of air sucker crimping. It is a fiber having an asymmetric structure as described by J.

Next, the non-woven metallic heat-shrinkable intermediate product of T, ili, and punched intermediate products was produced. The processing conditions were such that the length was regulated so as to achieve 30% heat shrinkage in each of the vertical and horizontal directions, and the heat shrinkage was carried out at a pin tenter temperature of 100° C. for 30 seconds. However, as shown in Comparison Table 2, the nonwoven fabrics of Examples 10, 20, and 30 of the present invention have a dense fiber density, are rich in elasticity, and have excellent resistance to bending/flexing U, dust collection rate, and external force. A bulky nonwoven fabric with satisfactory elongation anisotropy was obtained. On the other hand, in Comparative Examples 40.50, none were obtained that satisfied the object of the present invention.

However, Comparative Example 60.70 exhibited performance similar to Examples 10 and 20.30 in terms of physical properties shown in Table 2.

Examples 10, 20 and 30 and Comparative Example 40.50.
A thermal deterioration test was conducted for each of the 60 and 70 samples.

The results of 7 are shown in Table 3. As shown in Table 3, in the nonwoven fabrics 10.20 and 30 of the present invention, the degree of decrease in elongation at break was low and the thermal deterioration was also significantly improved. Comparative example 6
At 0.70-t', the elongation at break was significantly lowered, and the tensile strength was also lowered. The reason why the tensile strength was improved in the deterioration test is that the bonding of 11) and m in the nonwoven fabric increased by heating and pressing with a smooth roll.

1: J, T-margin

[Brief explanation of the drawing]

Figure 1 shows the fiber cross-sectional radial refractive index (n11 or n±)
This is an example of 74 turns of interference fringes used for measuring distribution. FIG. 2 is a schematic front view schematically showing a typical manufacturing apparatus for obtaining the nonwoven sheet of the present invention. 1...Fiber, 2...Interference fringes due to swordsman agent, 3...
Interference fringes due to fibers, 11... Spinneret, 12... Air server, car, 13... Conveyor net, 14...
Cold air chamber t 15...Filament group, 16...
・Web, L...Blowout width, A...Suita angle. Patent Applicant Asahi Kasei Kogyo Co., Ltd. Patent Application Agent Patent Attorney Akira Aomi Patent Attorney Kazuyuki Nishidate Patent Attorney Akira Yamaguchi Hyakuten Yamasai (b 1st (a) (b) Figure 2 Procedural Amendment ( Voluntary) June 1985/!Manabu Shiga, Commissioner of the Japanese Patent Office1, Indication of the case, Patent Application No. 50186 filed in 19882, Name of the invention, Bulky non-woven fabric with elasticity3, Person making the amendment. Related Patent applicant name (003) Asahi Kasei Kogyo Co., Ltd. 4, Agent address: Seikou Toranomon Building, 8-10 Toranomon-chome, Minato-ku, Tokyo 105 Telephone: (504) 07215, Subject of amendment (1) Statement of " Kiri (2) “Detailed description of the invention” column (3) “Brief description of the drawings” column 6 of the specification (1) Contents of the amendment (1) “Scope of claims” Amend the attached sheet. (2) Regarding the "Detailed Description of the Invention" column: ■ Amend "extremely" to "locally" on page 3, line 13 of the specification. ■ Page 5 of the specification. Correct “due to heat treatability” in the second line to “due to heat treatment”. ■ rl on page 6, line 9 of the specification, and page 7, line 10
, 60≦n11(.)≦1.67J, 600≦n
11. . , ≦1.670J. ■ On page 8, line 4 of the specification, before “meeting condition (B)”, it says “the shrinkage rate at 150°C is 5- or less r1.600”.
” and rl in the 6th line, “67 or more” is corrected to “1.670 or more”. ■ Correct "average refractive index" on page 9, line 4 of the specification to "average refractive index nll". ■ From page 11, line 7 to line 11 of the specification, [
At this time, the distance should also be set to 40' or less. "Then, the length L of the cold air blowing zone is, for example, 70 cm, and the angle θ of the blowing onto the filament group is 1.
For example, it is 35'. ” he corrected. ■ “≦1.64J” on page 12, line 13 of the specification
．． 640j and r5X10 J on the 14th line to r5.5X
10-'J and "web" in line 16 to "web"
and correct it. ■ Correct "500 times/6n2" on page 13, line 4 of the specification to "500 times/(:m" or less.) O "60 seconds," on page 13, line 8 of the specification ``Conduct heat treatment within the following @'' is corrected to ``Conduct heat treatment.'' ■ ``Also perform heat shrinkage'' on page 13, line 11 of the specification.
ヲ Correct it by saying, ``Perform the Engoss process.'' Change "from 10" to "from 50" on page 14, line 3 of O specification.
Then, "Flame retardant" in line 6 is corrected to "11 [Flame retardant"]. ■ In the details @ page 15, line 5, ``elaborate'' is corrected to ``uniform'' and ``seasonal''. O Specification page 19 line 13 “Pressure heating contact refractive index n
Correct rl, 565J, rl, and 528J in the If (.) column to rl, 592J, rl, and 583J, respectively, and correct rXlo-3J in the column of constituent fiber physical properties to r (X-10-3
) Correct as J. rl, 591J and rl in the column of average refractive index nl+,,,,) of Example 10 and Comparative Example 40 in Table 2, page 26 of the specification
, 551J to rl, 606J and f't, s9o, 1, respectively, and rXlo-3J of the tub of constituent fiber physical properties to r
Correct it as (xlO)J. (3) Regarding the “Brief explanation of drawings” column, Section 28 of the specification
"Schematic front view" in the fifth line of the page is corrected to "schematic diagram." 7. Amended list of attached documents Claims 1 copy 2. Claim 1: A filament with a fineness of 0.5 denier or more;
A nonwoven fabric having a fiber density with a particle collection rate of 15μ or more of 80% or more and an elastic recovery rate of 50% or more, the constituent fiber cross section of which has a circular cross section with a radius R, and the average refraction at the center of the nonwoven fabric. rate n11. . 2.・If the average refractive index at a distance of 0.8R from the center is n11, then υ is ≦n1lrot≦1.670 (O, a ) and (''(0,8) ''(0) )≧5×1
A polyethylene terephthalate long fiber nonwoven fabric that satisfies 0-3. 2. The direction of maximum breaking strength is taken as the binding direction, and the direction perpendicular to it is taken as D2, and the D! Or each stress at the same elongation in the direction of D2 is σi)t lσ9□, and the stress ratio σ
D1/σ0. is the anisotropy of the nonwoven fabric in its elongation, and the limb anisotropy is 0 in the elongation region of 1° chill and 30°.
．． The nonwoven fabric according to claim 1, which has a molecular weight of 8 to 3.0.

Claims (1)

[Claims] 1. A nonwoven fabric consisting of a filament with a ff1 degree of 0.5 denier or more, a fiber acousticity with a particle collection rate of 15μ or more of 80% or more, and an elastic recovery rate of 50% or more. And,
The constituent fiber cross section has a circular cross section with radius R, and the average refractive index at the center is n1l(.2, and the average refractive index at a distance of 0.8R from the center is n+1(0,8). Then, 1.60≦n1l(o)≦1.67 and (n1l
A polyethylene terephthalate long fiber nonwoven fabric that satisfies (o, 6)nll(g))≧5×10. 2. D is the direction of greater breaking strength! Binding, the direction perpendicular to it is set as D=, and each stress at the same elongation in the direction of DI-1: or D2 is σ(111σD2), and the stress ratio σ.□/σD2 is the stress ratio at the same elongation of the nonwoven fabric. The nonwoven fabric according to claim 1, wherein the anisotropy is 0.8 to 3.0 in the range of 10 to 30 inches in the elongated region.