JPH0233369A - Non-woven sheet and production thereof - Google Patents

Abstract

PURPOSE:To obtain nonwoven cloth without binder, with slight nap and having excellent tensile strength and elongation properties or feeling by performing special thermocompression bonding processing to nonwoven sheet composed of aromatic polyester continuous fiber having high breaking elongation of single fiber. CONSTITUTION:A web composed of aromatic polyester continuous fiber having 200-600% breaking elongation of single fiber is partially subjected to thermocompression bonding by embossing roll and wholly thermocompression bonded, then uniaxially drawn with heating. By said method, the surfaces of plural single fibers in the nonwoven sheet are mutually fusion bonded and interlaced points are formed, then a nonwoven sheet with no binder in which said interlaced points are irregularly interspersed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a long fiber nonwoven sheet made of aromatic polyester and a method for producing the same. More specifically, it relates to a nonwoven sheet having excellent fuzz resistance, tensile strength and elongation characteristics, and texture (flexibility), and a method for producing the same.
Utilizing its characteristics, it is used, for example, in double-sided tape base materials, various interlining materials, etc.

(Conventional technology) Conventionally, long fiber nonwoven sheets have been used for various purposes.

However, for example, double-sided tape base materials and various interlining materials, etc.
When using a non-woven sheet, in addition to tensile strength and elongation properties and texture (hereinafter referred to as flexibility), satisfactorily anti-fuzz properties on the surface of the non-woven sheet are also required. There is.

BACKGROUND ART Conventionally, a manufacturing method typified by a spunbond method is known as a nonwoven sheet made of aromatic polyester long fibers. The nonwoven sheet obtained by this method is usually composed of fibers having relatively high crystallinity and orientation produced by high-speed spinning at a spinning speed of 4,000 m/min or more. Also, a technique using semi-drawn aromatic polyester fibers is known, for example, in Japanese Patent Publication No. 57-54583,
For the purpose of softening the texture, uniaxial or biaxial stretching is described until some of the bonding points in the nonwoven sheet material are destroyed or some of the fibers are cut. ing. Further, JP-A-63-12747 describes stretching a nonwoven sheet for the purpose of imparting anisotropic shrinkability.

(Problem 5 to be solved by the invention) 5 However, in the case of the former nonwoven sheet made of fibers produced by high-speed spinning, the method of suppressing the fuzz of the nonwoven sheet is to use heat treatment. Compression bonding and resin processing are known, but with normal thermocompression bonding methods, it is difficult to balance the nonwoven sheet's shedding and tensile strength and elongation. That is, when thermocompression bonding is applied to iyJ, RF for the purpose of sufficiently suppressing fuzz, the fuzz is sufficiently stopped, but a problem arises in that the physical properties such as tensile strength and elongation of the nonwoven sheet are deteriorated. In the resin processing method, if an excessive amount of resin is applied to suppress fuzz, the fuzz will be sufficiently stopped, but the nonwoven sheet will become hard due to the resin, resulting in a problem of poor texture.

Next, in the case of the latter non-woven sheet composed of semi-drawn fibers, for example, in Japanese Patent Publication No. 57-54583, a sheet using semi-drawn yarns of aromatic polyester having a breaking elongation of 80 to 150% is uniaxially made. Alternatively, by stretching in the biaxial direction, some of the adhesion points between the fibers are destroyed and the texture is softened, so naturally the surface of the nonwoven sheet has sufficient anti-fuzz properties. do not have. Also, special public service in Showa 63. -1274
Publication No. 7 aims at anisotropic heat shrinkability and anisotropic extensibility, and the resulting nonwoven sheet does not have the high level of fluff resistance that is the objective of the present invention.

In order to solve these problems, the present inventors conducted intensive research and found that aromatic polyester filaments with relatively low crystallinity, molecular orientation, low softening temperature, and high single filament elongation at break were used. The present inventors have discovered that the above-mentioned problems can be solved by using a nonwoven sheet of the same name and subjecting it to appropriate processing, and have arrived at the present invention.

The object of the present invention is to provide a long-fiber nonwoven sheet made of substantially binder-free aromatic polyester that is resistant to fuzzing due to surface friction and has excellent tensile strength and elongation properties and texture, and a nonwoven sheet made of a substantially binder-free aromatic polyester. The purpose is to provide a manufacturing method.

Means for Solving Problem C) The present invention provides a continuous fiber nonwoven sheet made of aromatic polyester, in which the surface of a plurality of single fibers in the nonwoven material is A NOVA-INDER nonwoven sheet is characterized in that interlacing points that are fused and integrated with each other are irregularly scattered, and the joints of the interlacing points are tongue-shaped or web-shaped. .

Further, the present invention provides a web consisting of long fibers of aromatic polyester having a single filament elongation at break of 200 to 600%.
a step of performing partial thermocompression bonding using an embossing roll; a step of simply thermocompression bonding by simply suppressing the nonwoven sheet after the partial thermocompression bonding and heat-treating it while regulating the movement of fibers; A step of heating and stretching the nonwoven sheet after thermocompression bonding in at least one of the machine direction C (hereinafter referred to as the vertical direction) and the direction perpendicular to the machine direction (hereinafter referred to as the horizontal direction). A method for producing a nonwoven sheet, comprising:

The present invention will be explained in detail below.

Figures 1, 2 and 3 show one of the nonwoven sheets of the present invention.
Examples of micrographs are shown in FIG. 1 at 500x magnification, FIG. 2 at 800x magnification, and FIG. 3 at 50x magnification. FIG. 1 is a photograph of an example of an interlaced point having a tongue-shaped joint according to the present invention, and the interlaced point has tongue-shaped joints above and below the yarn in the weft direction. FIG. 2 is a photograph of an example of an interlacing point having a web-like joint as referred to in the present invention. FIG. 3 is a photograph showing that interlaced points having tongue-like or web-like joints as used in the present invention are irregularly scattered in a nonwoven sheet.

In the present invention, it is preferable that there be at least one such intertwining point when a circle with a diameter of 1 mm is drawn on a normal average surface of the nonwoven sheet of the present invention.

Figure 4 shows a web made of long fibers made of aromatic polyester with a relatively low elongation at break of 200 to 600%, having relatively low crystallinity, molecular orientation, and a low softening temperature, after being partially thermocompressed using an embossing roll. FIG. 2 is a cross-sectional view schematically showing the state of intertwined points in a nonwoven sheet when thermal compression bonding is carried out in a simplified manner. That is, it is a schematic diagram showing that a fiber 1 (warp thread) and a fiber 2 (weft thread) that intersects with the fiber are firmly fused and integrated with each other on the surfaces of each fiber, Nonwoven sheets with these intertwined points have satisfactorily anti-fuzz properties, but because the molecular orientation of the constituent fibers is low, the single fiber strength of the fibers is low, making it difficult to obtain satisfactory tensile strength and elongation properties. Can not.

The present inventors heated and stretched a nonwoven sheet having intertwined points (not shown in FIG. 4) to increase the molecular orientation of the constituent fibers, improve the single fiber strength of the fibers, and achieve a satisfactory tensile strength. We were able to obtain strong and elongation properties. Furthermore, it has been discovered that even after heating and stretching, the fused and integrated bond does not come off, and therefore there is a condition in which there is no fluffing.

FIG. 5 is a cross-sectional view schematically showing the state of the interlacing points in the nonwoven sheet when the nonwoven sheet having the interlacing points shown in FIG. This shows that the bonding interface 3 between the integrated single fibers is stretched and spread together with the fiber 1 (warp yarn), resulting in an entangled state of tongue-like bonding as referred to in the present invention.

Furthermore, when the nonwoven sheet having the intertwining points shown in FIG. It is stretched together with the weft yarn and spreads in two directions, and becomes the intertwining point of the web-like joint in the present invention.

In the present invention, although the nonwoven sheet does not substantially contain resin or the like for bonding between the fibers, so-called binder-free, the entangled points have strong tongue-like or web-like joints. By irregularly scattering them in the nonwoven sheet, it is possible to obtain a nonwoven sheet that has extremely good fuzz resistance and also has satisfactory tensile strength and elongation characteristics and texture.

Next, a typical manufacturing example for obtaining the nonwoven sheet of the present invention will be described.

A web is formed by a so-called spunbond method in which long fibers made of melt-spun aromatic polyester are stretched using an air sucker or the like and then dispersed and deposited on a collection surface. The important thing here is to increase the spinning speed to 3,000 m.
/min or less, preferably 2.500m/min or less,
By lowering the degree of stretching of the fibers constituting the web, and by lowering the molecular orientation of the fibers, the single filament elongation at break can be made 200 to 600%.

When the elongation at break of a single yarn is 200% or less, Δη, which is a measure of the molecular orientation of the fiber, becomes 0.035 or more, the degree of crystallinity also increases, and the softening temperature of the fiber is high, so the web made of this fiber cannot be embossed. After partial pressure bonding using a roll, the intertwining points of the fibers in the nonwoven sheet were not bonded sufficiently when thermal compression bonding was performed with a simple restraint, and as a result, the bonded interface came off in the next stretching process. , the result is that fuzz is likely to occur. especially,
When abrasion resistance is required, the elongation at break of single yarn is 300.
% or more is preferable.

Furthermore, when the elongation at break of a single yarn is 600% or more, the molecular orientation of the fibers is extremely low, the degree of crystallinity is low, and the softening temperature of the fibers is extremely low. When partial pressure bonding is performed using a nonwoven sheet, the resulting nonwoven sheet may adhere to the embossing roll, the tensile strength of the obtained nonwoven sheet after partial heat pressure bonding may be low, and the handling properties may be poor when transferring to the next process. When the nonwoven sheet after partial thermocompression bonding is subjected to thermocompression bonding while being kept simple, the fibers deteriorate and only a nonwoven sheet that is extremely easily brittle is obtained.

Here, the fibers constituting the web have a denier of 0.5 to 30, preferably 1 to 20 denier.

The fibers may be of the same or different fineness.

Next, the process to obtain the nonwoven sheet that is the object of the present invention will be explained. First, the web is partially thermocompressed using a pair of embossing rolls having an uneven pattern on at least one surface. The roll temperature is preferably higher than the second-order transition temperature (Tg) of the aromatic polyester and lower than Tg + 30°C. Also, the roll linear pressure is 5 to 50 kg/cm
It is preferable that Here, the partial thermocompression bonding rate is 5 to 5.
A range of 0% is preferred. Also, the crimping depth is 0.1 to 0.5
A torso is preferred. Further, the basis weight of the partially thermocompressed nonwoven sheet at this stage is preferably 10 to 300 g/rd, but is not particularly limited.

The thus obtained nonwoven sheet after partial thermocompression bonding is
Next, heat treatment is performed while controlling the movement of the fibers due to shrinkage and the like. A preferred method is to heat the felt by passing it through a heated felt calender drum, as shown in FIG. The drum temperature in that case is Tg + 20 to Tg + 100°C, preferably Tg + 25 to Tg + 70°C. When the drum temperature is Tg + 100°C or higher, the molecular orientation and crystallization temperature of the fibers constituting the nonwoven sheet after partial thermocompression bonding are low, so when thermocompression bonding is carried out while being kept in a simple manner, the fibers' Thermal deterioration is severe and it cannot withstand stretching in the next step.

In addition, if the drum temperature is below Tg + 20°C, the intertwining points of the fibers in the nonwoven sheet will not be sufficiently joined when thermocompression bonding is performed while the nonwoven sheet after partial thermocompression bonding is simply suppressed. Therefore, it is not possible to suppress fuzz. The surface pressure between the felt calender drum and the felt is 10 to 200 g/c
m2 is preferred.

In the present invention, simply suppressing the nonwoven sheet means between the felt calender drum and the felt, or between the felt calender drum and the felt.
It means to uniformly regulate a nonwoven sheet two-dimensionally between a large number of closely spaced tension rolls, between heat rolls, or between calender rolls. In this way, by heat-compression bonding while keeping it simple, the intertwining points of the fibers in the nonwoven sheet are firmly fused and integrated on the surfaces of each other's fibers, and the nonwoven sheet is They are scattered irregularly throughout the sheet.

Next, the nonwoven sheet that has been thermocompression bonded while being suppressed in a simple manner is subjected to thermocompression bonding while being suppressed in a simple manner at a temperature higher than the secondary transition point (Tg) of the aromatic polyester, and then held between nip rolls and clipped. Stretching is performed in the vertical or horizontal direction using a tenter or the like, similar to the stretching of a film.

As for the stretching ratio, only in the vertical direction or only in the horizontal direction,
By stretching each 1.5 to 4 times, preferably 1.8 to 3 times, or 1.5 to 4 times, preferably 1.8 to 3 times in both the vertical and horizontal directions, It is possible to obtain a nonwoven sheet having good fuzz resistance and satisfactory tensile strength and elongation properties and texture, which are the objectives of the present invention. If the stretching is carried out, for example, only in the longitudinal direction, a nonwoven sheet having anisotropic strength with high tensile strength in the longitudinal direction can also be obtained.

The aromatic polyester in the nonwoven sheet of the present invention is
These include polyesters containing polyethylene terephthalate, polybutylene terephthalate, dibasic acids such as isophthalic acid and methyl terephthalic acid, and dihydric alcohols such as ethylene glycol and propylene glycol as copolymer components. Further, a small amount of a different polymer such as polyamide, polyolefin, polycarbonate, etc. may be added to the polyester as necessary within a range that does not impair the object of the present invention.

Further, the degree of polymerization of the aromatic polyester is not particularly limited as long as it is within the range for normal fiber formation.

Furthermore, small amounts of pigments, matting agents, antistatic agents, flame retardants, resins, etc. may be added to the nonwoven sheet of the present invention within a range that does not impair the purpose of the present invention.

(Examples) Hereinafter, several examples of the nonwoven sheet of the present invention will be shown, and a comparison of physical properties with comparative examples will also be shown.

The definitions of the terms used in the physical properties and the methods for measuring them are as follows.

Eye size: Take a 20cm x 20cm test piece, measure its weight, and convert it to the weight per hole. In the present invention, 3 to 25
A basis weight of 0 g/rrf is preferred.

Strength and elongation: Toyo Baldwin “Ransilon J STM-101”
Measure using a universal tensile tester.

Sample: 51 width x 201 length between chucks, grasping length: 10 cm, tensile speed: 20 cm/min At this time, a converted value of 100 g/r'If basis weight was also calculated. In the present invention, the tensile strength converted to the basis weight is 25 kg/15 cm width-100 g/r in at least one direction.
rf or more is preferable.

Abrasion resistance (indicating fuzz resistance characteristics): A test piece measuring 20 cm vertically x 3 cm horizontally was subjected to 100 reciprocating frictions at a load of 500 gr using an abrasion tester type ■ (Gakushin model), and the changes in the appearance of the test piece were as follows. Judgment is made in accordance with the criteria of the following and is used as a guideline for wear resistance.

Judgment criteria; A grade: No fluff at all.

Grade 8: There is some fluff, but it is not noticeable.

Grade 0: Fluff is noticeable.

In the present invention, grade B or higher is preferred in both the vertical and horizontal directions.

Bending resistance (45° cantilever method): The bending resistance is determined by the 45° cantilever method as a measurement of texture (indicating flexibility) (JIS-L-1079A
Method) In the present invention, it is preferably 81 or less.

Presence or absence of tongue-like or web-like interlacing points; Observe the interlacing points under a microscope to determine the presence or absence.

Examples 1-4. Comparative Examples 1 to 2 Using a rectangular spinneret with a hole diameter of 0.25 mm and 1,000 holes, polyethylene terephthalate with an intrinsic viscosity of 0.75 was spun at a discharge rate of 2.000 g/min at a melting temperature of 290°C. The distance from the spinneret to the traction air sucker was 1,000 mm, and the spun yarn was spun at a spinning speed of 1,800 mm.
A uniform web was collected on a wire mesh at m/min.

The above web (performance of the constituent fibers: fineness 10.0 denier, single yarn breaking elongation 350%, web basis weight 50 g/bo) was partially thermocompressed using a pair of embossing rolls with an uneven pattern on one surface. I did it. At this time, the unit area of the convex part of the embossing roll is 2 mm2, the crimping area ratio is 18%, and the roll linear pressure is 20 k at the upper and lower roll temperatures of 80°C.
Partial thermocompression bonding was performed at g/c++.

(This will be referred to as non-woven sheet A hereinafter.) Next, this non-woven sheet A was processed into a felt calender as shown in Fig. 6 (drum diameter 1,500 mm, temperature 105°C, processing speed 10 m/min).
Immediately after, heat treatment is performed with a pair of nip rolls (
Heat roll temperature 105'C), magnification 2.5x, 3.0
The nonwoven sheet of the present invention (Examples 1 and 2) was
) was obtained.

Further, the nonwoven sheet of Example 1.2 was stretched 1.6 times and 2.1 times in the horizontal direction using a pin tenter at an ambient temperature of 80'C and a processing speed of 15 m/min, A nonwoven sheet of the present invention (Example 3.4) was obtained.

As Comparative Example 1, sheet A was heat-treated in the felt calender under the same conditions as described above and wound up as it was without being stretched.

As Comparative Example 2, after spinning under the same conditions as above, the fabric weight was 10g/
rT? A web was obtained, further heat-pressed under the same conditions using the embossing roll described above, heat-treated using the felt calender under the same conditions described above, and wound up without stretching.

Comparative Examples 3 to 6 Using a rectangular spinneret with a pore diameter of 0.25+n+n and a number of holes of 1,000, the intrinsic viscosity was 0.7 at a discharge rate of 1 t and 000 g/min.
5 polyethylene terephthalate at a melting temperature of 290'
C, the distance from the spinneret to the traction air sucker was 450 mm, and the spun yarn was spun at a spinning speed of 5.000.
A uniform web was collected on a wire mesh at m/min.

The above web (performance of the constituent fibers: fineness of 1.8 denier, single yarn breaking elongation of 65%, web basis weight of 12 g/rrf) was prepared using the same embossing rolls as shown in Examples 1 to 4, and the upper and lower roll temperatures were set at 210 denier. 'C, 230'' and C1250'C, and partial thermocompression bonding was performed at a roll linear pressure of 20 kg/cIII to obtain nonwoven sheets of Comparative Examples 3 and 4.5, respectively.

Further, an aqueous polyvinyl alcohol solution was applied to the nonwoven sheet of Comparative Example 4 by a kiss roll method so that the amount of adhesion after drying was 9%, to obtain a nonwoven sheet of Comparative Example 6.

Table 1 shows the physical property values of the nonwoven sheets of Examples 1 to 4 and Comparative Examples 1 to 6.

As shown in Table 1, the nonwoven sheets of Examples 1 to 4 have good fuzz resistance and texture, and are also excellent in tensile strength in at least one of the vertical and horizontal directions. It turned out to be a woven sheet.

Next, in both Comparative Examples 1 and 2, the molecular orientation of the constituent fibers was low, as the molecular orientation of the constituent fibers was low, and the molecular orientation in both the vertical and horizontal directions was low because the heating treatment was not carried out after heat treatment with a felt calender. The tensile strength is also low, so it cannot be used as a nonwoven sheet as the object of the present invention.

Next, Comparative Examples 3 to 5 are nonwoven sheets obtained using conventional techniques, in which the temperature of the embossing roll was changed during partial thermocompression bonding.
A nonwoven sheet that satisfies all tensile strength and elongation properties cannot be obtained.

In addition, Comparative Example 6 is a resin processed version of Comparative Example 4,
Although the fuzz resistance is considerably improved, the resin makes the nonwoven sheet hard, making it impossible to obtain a satisfactory texture. Furthermore, when observing the state of intertwined points in the nonwoven sheet, Examples 1 to 4,
In Comparative Example 6, it was found that tongue-shaped or web-shaped fused and integrated intertwined points were irregularly scattered, but in Comparative Examples 1 to 5, no such intertwined points were found. There wasn't.

Examples 5 to 7, Comparative Examples 7 to 8 Polyethylene terephthalate with an intrinsic viscosity of 0.75 was melted at a discharge rate of 2,000 g/min using a rectangular spinneret with a pore diameter of 0.25 mm and a number of holes of 1.000. The fibers were spun at 290°C, the distance from the spinneret to the traction air sucker was 1,000 mm, and the traction force of the air sucker was adjusted to produce several fabric weights of 50 g consisting of filaments with various single fiber elongations at break. A web of /rrf was obtained, and under the same conditions as Examples 3 and 4, partial thermocompression bonding was performed using an embossing roll, and thermal compression bonding was carried out with a felt calender in a simplified manner. A good stretching ratio was selected and stretching was carried out in the same manner as in Examples 3 and 4 to obtain various nonwoven sheets. The result is the second
Shown in the table. Examples 5 to 7 demonstrate the effects of the present invention.

Examples 8 to 9, Comparative Examples 9 to 10 Using a rectangular spinneret with a hole diameter of 0.25 mm and 1,000 holes, polyethylene terephthalate with an intrinsic viscosity of 0.75 was melted at a melting temperature of 290° at a discharge rate of 1850 g/min. Spinning with C, the distance from the spinneret to the traction air sucker is 1,
Example 3: 000 mm, the traction force of the air sucker was adjusted to obtain several types of webs with a basis weight of 50 g/rrT consisting of filaments having various single filament elongations at break.
, 4, partial thermocompression bonding was performed using an embossing roll, and a felt calender (drum diameter 1+500 tan) shown in FIG. 6 was further applied.

Heat treatment was carried out at a temperature of 120°C and a processing speed of 10 m/min), and stretching was carried out in the same manner as in Example 3.4, selecting a good stretching ratio in the vertical and horizontal directions according to each sample. Got a sheet. The results are shown in Table 3.

Examples 8 and 9 demonstrate the effects of the present invention.

Examples 10 to 11 with blank space below Polyethylene terephthalate with an intrinsic viscosity of 0.75 was spun at a melting temperature of 290''C at a discharge rate of 200 g/min using a rectangular spinneret with a hole diameter of 0.25 mm and 100 holes. The fibers were divided into 50 threads each.

Each set of yarns was sucked into two rectangular air suckers to form a web at a spinning speed of 1,800 m/min. The conditions at this time are that the rectangular air sucker is located 1,000 mm above the web collection device,
The two rectangular air suckers are stacked symmetrically with respect to the traveling direction of the web collecting device, with the angle between the lengthwise slits of the two rectangular air suckers set at a 50° angle, to create a more isotropic structure. I pulled out a web.

The above web (performance of constituent fibers: fineness 10.0 denier, single yarn breaking elongation 350%, web basis weight 50 g/n ()
Under the same conditions as in Example 3.4, thermocompression bonding was carried out while suppressing partial thermocompression bonding using an embossing roll and simplification using a felt calendar, and further magnification was 2.5 times using a pair of nip rolls (thermal roll temperature 105°C). Stretch in the vertical direction with
A nonwoven sheet of the present invention (Example 10) was obtained.

Furthermore, the nonwoven sheet of Example 10 was processed using a pin tenter at an ambient temperature of 80° C. and a processing speed of 15 m/min.
The nonwoven sheet of the present invention (Example 11) was obtained by stretching 2.5 times in the transverse direction.

Table 4 shows the physical property values of the nonwoven sheets of Examples 10 and 11 above.

In Example 1, the thermocompression-bonded nonwoven sheet (2) is stretched 2.5 times in both the vertical and horizontal directions while suppressing the fiber arrangement to a simple, almost isotropic state. In addition, the resulting sheet had strong tensile strength in both the vertical and horizontal directions.

Table 4 *(Vertical/Horizontal) (Effect of the invention) The nonwoven sheet of the present invention has the following excellent characteristics.

■ Although it is binder-free, it is a non-woven sheet with extremely excellent fuzz resistance.

■ Because the constituent fibers are stretched, the nonwoven sheet has satisfactory tensile strength and elongation characteristics.

■ Since it is binder-free, it has a satisfactory texture and is a non-woven sheet that has no restrictions on applications where contaminants are averse, such as in food and medical applications.

Because it has the above characteristics, it can be widely used for double-sided tape base materials, various interlining materials, etc.

[Brief explanation of the drawing]

FIG. 1 is a photomicrograph (magnification: 500 times) showing an example of the state of interlaced points having tongue-like joints in the nonwoven sheet of the present invention. FIG. 2 is a micrograph (magnification: 800
times). FIG. 3 is a micrograph (50x magnification) showing that entangled points having tongue-like or web-like joints as used in the present invention are irregularly scattered in the nonwoven sheet. FIG. 5 is a cross-sectional view schematically showing the state of an interlaced tunic having a tongue-shaped junction as used in the present invention, and FIG. 41! J: This is a cross-sectional view schematically showing the state of the interlacing points at the same locations as in FIG. 5 before stretching the nonwoven sheet having the interlacing points not shown in FIG. 5. Figure 3 is a schematic front view showing an example of a device for making a V-shaped non-woven fabric according to the present invention. 1.1'...Turf/yarn; 2. 2'...Weft thread, 3
, 3'...Joint interface, 4...Spin lock, 5...
...Spinning 1" Gold, [; Cold air chamber, 7... Air zarakha, 8... Pressure chamber, 9... D'irament group, 10... Web, 1 toeni/,) 6 rolls, 1
2...Felt Calendar Yumino, 13...Fel l-, 14...Niplow made by Ryomu! 14'...
Metal heating roll, 15...Rubber nip Ui+-le, 15'...Metal [''-le], 16...Pinch valley +7...Take-up roll, 1B...Suction drum, 10...・-1゛..., Asahi Kasei Corporation, Asahi Kasei Corporation, Fig. '82

Claims (2)

[Claims] (1) In a long-fiber nonwoven sheet made of aromatic polyester, intertwining points where the surfaces of a plurality of single fibers in the nonwoven sheet are fused and integrated with each other are irregularly scattered, A binder-free nonwoven sheet characterized in that the interlacing points are tongue-shaped or web-shaped. (2) Single fiber elongation at break made of aromatic polyester is 20
A step of partially thermocompressing a web consisting of 0 to 600% long fibers using an embossing roll, and heating the nonwoven sheet after the partial thermocompression by suppressing the area and regulating the movement of the fibers. In this step, there is a step of heat-compression bonding on the surface,
A nonwoven sheet comprising the step of heating and stretching the nonwoven sheet after surface thermocompression bonding in at least one of the machine direction and a direction perpendicular to the machine direction. manufacturing method