JPS60155761A - Heavy nonwoven fabric interlaced by water pressure - 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 The present invention relates to non-porous, heavyweight nonwoven fabrics made by hydraulically intertwining stable fibers of synthetic organic polymers. More particularly, the present invention relates to such fabrics that have extremely strong tensile properties and a high degree of fray resistance.

Fibers made by entangling stable fibers of synthetic organic polymers under static 11-pressure can be made into stable pore-free HA fibers without the presence of a resin binder by melt bonding between the fibers and m-fibers. Non-woven fabrics from which fabrics are made are known. Industrially, such textile fabrics are usually made to have a basis weight of less than 4 ounces per square yard (138 g/a+2). Bunting, U.S. Patent No. 3,493,482, No. 3,508,30
No. 8 and No. 3,580,328 describe a number of such w1 fabrics having a basis weight of up to about 20 ounces/square yard (880 g/m 2 ). Industrially made from stable fibers intertwined by static IF pressure, the non-porous fabric is strong, with a maximum tensile strength of 8.5 (bonds/in)/(oz/sq yd) [0.44 (N/cm)/(g/m 2)]. However, this type of thick fibrous fabric described in the Panting et al. patent is relatively weak. For example, thick # like this
llll Dispense trip tensile strength is 8.7 (bond/square yard) [22? g#a2)] to the poem with a weight of 4.
39 (bond/inch)/(oz/square yard) [
0.22B (N/cm)/(g/n+ 2)],
io and 20 (bond/square yard) (339 and 87
1.3 and 1.1 (bond/inch)/(oz/square yard) C
O, (1B? and 0.059 (N/cI11)/(g
/m2)].

Various attempts have been made to strengthen nonwoven fabrics made from these hydraulically entangled stable fibers. Some of these attempts include layering of very long (e.g. 8 inch [15,24 cml) gA female fibers, fibers with special cross sections, substantially continuous filaments, scrims, webs of continuous filaments, etc.] into fiber fabrics. , or methods of incorporating layers with special designs. Among the process changes made to increase strength are first moving the raw web of stable fibers statically in one direction using a pressure jet and then moving the web into a second direction.
start the operation using special threads, applying special chemicals to the static pressure jet, using special supports or grills to treat the web at static pressure It includes doing. - In general, such modifications to increase strength are effective for lightweight textile fabrics. However, these modifications are generally not sufficient to produce strong, pore-free, heavy-weight nonwovens made by hydraulically entangling stable fibers of synthetic organic polymers. Such strong, heavy fibrous fabrics are desirable for applications such as gas filtration under harsh conditions. It is an object of the present invention to provide such a strong, pore-free, heavy weight nonwoven fabric.

According to the present invention, the basis weight is 200 to 850 g/m2[E
l to 25 oz/sq yd], grab strength of at least 113 ON/cm [91 bonds/in1, Strip tensile strength of at least 0.28 (N
/cm)/(g/m2)[5(bond/inch)/(
ounces per square yard month and resistance to fraying is characterized by at least 50 alternating stretches. An improved nonwoven fabric is provided. Preferably, the fibrous fabric has a basis weight of 240 to 510 g/m2 [7 to 15 oz/yd2] and a grab strength of 245 to 875 N/cm [14
0-500 bonds/inch1, strip tensile strength 0
．． 38-0.77 (N/cm)/Ig#n 2) [?
~15 (bond/inch)/(oz/square yard)
], and the fraying resistance is at least 50 times of alternating stretching. Usually suitable fiber fabrics have a density of 3 to 1 cm/cm.
It has O jet trucks. Suitable stable fibers are 1-18 dtex [0,! 3~
18 denier l, length O, [l ~ 5 c+i
[1/4 to 2-inch 1.

Suitable polymers for the stable 7-mer are poly(p-phenylene terephthalamide), poly(m-phenylene isophthalamide) or poly(ethylene terephthalate).

Furthermore, according to the present invention, one synthetic organic polymer is stable.
1. A method for producing a heavy non-woven fabric without pores by supporting a fiber batt on a perforated screen and treating the batt with a water stream while moving the fiber batt in a direction perpendicular to the rows of thin columnar water streams. For strong m-discharged fabrics, fiber fabrics with a basis weight of 200 to 850 g/m 2 and a length of 0.
8-5 made from a batt consisting essentially of 1-18 dtex stable fibers of C+++, which, immediately after preagglomeration and wetting, is treated with a stream of water to remove some of the stable fibers. The water stream is moved from one surface of the batt through the thickness of the batt to the opposite surface, and the rows of water streams are arranged at a frequency of 3 to 10 per c+m and have a diameter of 0.13 to 0.22 mm. A method is provided, characterized in that water is supplied from an orifice of. In a preferred embodiment of the method of the invention, the basis weight is 2
40-510 g/112, and the fiber length is 1.3
~3.8 cm, dtex is 1.4~2.5 dte
What is the frequency of x-te, oriff, and f-s? 3~ per c+++
6, and the water flow is supplied at a pressure of 6880-22740 kPa.

The present invention will be more easily understood with reference to the accompanying drawings which show the tensile strength per basis weight of the fiber fabrics of the present invention compared to those of the prior art. is a non-porous, heavy weight non-woven fabric made by entangling stable fibers using hydraulic pressure.
It means that it has a basis weight of [square yard].

Important advantages of the product of the invention are illustrated in the graphs of the accompanying drawings. The stripped edge area represents a non-porous nonwoven fabric made by entangling conventional stable fibers with static l-pressure. The individual points on the graph are strip tensile strength data detailed in the Examples below. Note that the heavy 1 mm fabric of the present invention has very high tensile strength. These strong m-sheets of the present invention also exhibit excellent grab strength and fray resistance.

- In general, stable fibers suitable for use in the non-porous nonwoven fabric of the present invention have a diameter of 1 to 18 dte.
6 denier] and the length is 0. e ~5 cm [1/4~2
inches]. Preferably the dtex range is from 1.4 to
2.5 dte++ (1,25 to 2.25 denier), and the length range is 1.3 to 3.8 ci [1/2 to 1-1
/2 inch]. Fibers of circular cross section are preferred.

Stable fibers can be made of any synthetic organic polymer. Among the suitable polymers are poly(p-
phenylene terephthalamide), poly(m-phenylene isophthalamide), and poly(ethylene terephthalate). A fabric made of #1lfIk entangled by static 11-pressure of each polymer is illustrated in the Examples.

The non-porous heavyweight nonwovens of the present invention have a unique combination of advantageous properties, including a grab strength of at least 18 ON/cm [81 bonds/inch], preferably between 245 and 875 N/cm. [140-500 lbs,'in], strip tensile strength of at least 0.2
8 (N/cm)/(g/m2) [5 (bond/inch)/(oz/square yard), preferably 0°38~
0.77 (N/cm)/(g/m2) [? ~15
(1 inch of bond)/(ounce/square yard),
The resistance to fraying is determined by the number of extensions of the alternating W being at least 50. Preferably, it is at least 90.

According to a preferred method, the hydro-entangling treatment is carried out in the production of the fiber fabric of the present invention to create intertwined and closely spaced repeating patterns in the fabric, i.e.
A non-woven fabric with no pores is obtained which has a "jet track". The jet tracks are easily visible at low magnification.The preferred #lI# fabric of the present invention is 3-10 per IC-
, most preferably 3 to 8 [7.5 to 25 per inch]
, most preferably 7.5 to 15 jet tracks.

When producing the heavy weight non-woven fabric without pores of the present invention, Stable fibers are mixed with Zafiroglue (Zafi glue).
200-850 g/+a 2 [8-25 oz/sq yd] by a process such as that described in U.S. Pat. Make it into a bat. A continuous hydraulic entanglement process is then applied to the raw stable fiber batt on a perforated support such as a woven wire screen.

In the hydraulic entangling process, the batt is exposed to a series of thin columns of water delivered to the surface of one side of the batt, and then the other side of the batt. The water stream is supplied from a row of orifices located just below the surface of the bat, usually about 1 inch [2.5 cm] below. Duoljanin (
(Ivor Janyn) U.S. Patent No. 3.403.
An orifice of the type described in No. 8132 is used. A suitable orifice is 0.13-0.22m+[0,005
~0.009 inch]. In an advantageous method of the present invention, at least 3 per 11 ICl [10 per inch [7.51 per inch] [25 per inch], and most preferably less than 5 [10 per inch]
2. Orifices are arranged so that fewer than 7 jet tracks are obtained.

In the preferred hydraulic treatment, a portion of the staple fiber initially placed on one side of the batt is driven through the thickness of the batt to the opposite side of the batt by a jet of water. A significant rearrangement of the fibers takes place immediately after the batt is first wetted and pre-coagulated lightly. If the raw material bar/ ) has sufficient integrity as it is fed into the entanglement process, this water stream will be This important reordering occurs only in the first column of . The use of such jets at wide spacings (i.e., less than 10/cm) allows for deeper penetration of water holes with less interference from adjacent streams than when jets are used at narrower spacings. Furthermore, in contrast to commonly used industrial methods that use gradual increases in the pressure of the water stream in each successive row of jets, the first row of jets (or The highest pressure can be supplied to the second row (first row). Preferably the pressure of this first row of jets is between 11,890 and 22,740 kPa [10
It is in the range of 00 to 3300 psi. This immediately causes the fibers on the surface of the bat to form a dense, tightly intertwined surface layer, thus impairing the penetration of the water jet and allowing some of the tIim to pass from one side of the bat through the thickness of the bat to the opposite side. This prevents the vehicle from moving. Once the initial desired rearrangement has been achieved, the remaining entanglement steps are performed by known methods. The jet track created by the initial high impact jet is not obliterated or obscured by the use of closely spaced jets for the remainder of the static; L pressure path alignment process. . Compared to other methods such as those described herein,
The preferred hydraulic jet treatment described above yields a heavyweight nonwoven fabric with strong, good interlocking and delamination resistance.

Stable fibers with mixed length and/or mixed decitex
Fiber blends can generally be easily made into the fiber fabrics of the present invention compared to fibers of substantially only one length and decitex. Thus, staple fiber blends provide lower overall energy costs per unit weight of fiber and lower peak jet pressures for the fiber fabrics of the present invention. Heavy, long, and stiff m-fibers are difficult to rearrange and intertwine.

The following test methods were used to measure various properties and properties reported herein. All measurements were made on dried 7-fiber fabrics and m-fibers.

Tensile properties were measured on an Instron tester at a temperature of 70"F and a relative humidity of 65 degrees.

Strip tensile strength was determined by the general method of ASTM method D-828-80, 172 inches [1.27 cm] wide.
, on a 4 inch [10,18 cm] long sample using a gauge length of 2 inches [5,08 cm] and an elongation rate of 50 z/min.

Grab strength was determined by the general method of ASTM method D-11382-84, 1 width 4 inches [10,18 cm], length 6
For a sample of inch [15°2ζ cml, gauge length 3
Measurements were made using inches [7,132 cal] and an elongation rate of 25 z/min.

For each measurement of tensile properties, the sample was placed in the machine direction of the fabric (N
O), and in the direction crossing the machine direction (XD). In the graph of the accompanying drawing, only the average values of values for MD and X[] are plotted.

The fraying resistance of a nonwoven fabric without pores is determined by the Alternate Extension Test described in the following literature.
5t). Symposium held in New Orleans, Louisiana, U.S.A.: “Unhealthy & Cloth Industry – Its impact on the 1980s”
Johns and Au
``Measurement of fraying resistance of spunlace fiber cloth'', Symposium Report, pp. 158-182 (19
March 1979).

m# The load in g applied to the sample in the machine direction of the fabric (i.e. the vertical load of the testing machine) is multiplied by 2.65 to give g1
The basis weight is 112 units. The load applied in the cross direction is half the load in the machine direction.

In the following examples, staple fiber batts were static pressure jet treated to form the strong weight fiber fabrics of the present invention. Various combinations of orifices were used to provide a column of water onto the bat, while the bat was supported on a screen, thereby removing water. The orifices are arranged in rows perpendicular to the direction of bat travel and are located approximately 1 inch (2.5 cm) from the surface of the hat. Five sets of orifices and five different screens were used. These orifice sets are as follows.

Orifice Orifice straight 1 inch (Cm) set
Minister-Eng. [0,178] 5 [2,01B
0.00? [0,178] 10[3,91CO,OO
? [0,178120[7,91D 0.005 [0
,127140[15,7]E' 0.005[0,
t271 2Q [? , l111 orifice A, B, C1
In sets E and E, all the orifices are lined up, but in set 0.04 inch [0
, 10 cm].

Each row contains 20 orifices per inch [7.9 per cm].

The various wire mesh screens used in the examples are as follows.

Open area per inch (c+i) of screen,
-45- A IQOx9B[39,3x3? , 81 21B 7
5x58[29,5x22.8] 21C40x3B[
15,? x14.21 38D 20x20 [? ,9
x7.9] 41E 50x50[18,7x19.7
1 50 Example 1 The grain side was fabricated according to the invention using a non-porous, heavy jet-tracked non-woven fabric of poly(p-phenylene terephthalamide) intertwined staple-fibers at static 1 F pressure. exemplify.

Two types of poly(p-phenylene terephthalamide) breads were made. Each bat is 374 inches long [1,9c
m1, 1.5 denier [1,7 dtexl T-28
It consists of a three-layer web made from aromatic amide m fibers in a land uni 2.9-air deposition machine. E. 1. Du Pant de
It was manufactured by Ne1ou, rs). The basis weight of rose H-a is 14.7 ounces/square yard [498 garb2]
, the basis weight of bat 1-b is 16.4 ounces/square yard [
55B g/m2]. Each bat is then placed at -L of screen C and advanced under the columnar stream of water fed to orifice set C at a speed of 10 yards and 7 minutes [9,14 m/min].

The pressure supplied to the rows of jets one after the other is 500 pg i [3450 kPa for the jets x y of the first row.
], and for each of the next three rows of gents, 3,
300 ps'i [22,? It was 40kPal. The same jetting sequence was used when passing through the other side of the bat.

Table 1 shows the energy impact! ! (Exl) product and the total energy expended in the hydraulic jet treatment, as well as the average values of the strip tensile strength in the MD force direction and in the The fabric of the invention was shown to have an extremely high strip tensile strength compared to the highest strip tensile strength exhibited by a conventional fabric of the same basis weight. The fabric of this example has a strip tensile strength about 7.7 to 8.2 times that of a conventional fabric of comparable basis weight.

Table 1 Fiber cloth of Example 1 and 1"Y"↓→ Basis weight oz#d 214.7 1B, 4 [gm/m2] [498] [5581 Energy difference! ! ! Product Hp-hr lbf/lbmO, 1230, 110 [1
08JN/kgl [3,23] [2,89] Energy Hp-hr/lbmO, 7B' O, Elflrlo
” J/kgl (4,48) [4,011 Grab strength NO, lb/in 334 35? IN/cm] [584] [824] XD, lb
/ in 492 500 [N/cal [8flll
[875] Strip Tensile Strength Zero HD, Footnote 1 13.0 11.5 [Footnote 21 [0,87] [0,59] XD, Footnote 1
13.8 11.8 [Footnote 21 [0,71] [0,801 intersection τ extension cycles >100. >200 jet truck per inch 2020 [1cm duty] [7,87] [7,871 years old footnote;
1. Strip tensile strength in units (bond/inch) (oz/square yard)2, values in parentheses are (N/cm)/(g/m2) 1st place strip tensile strength example 2 This example shows the The present invention is illustrated using a non-woven, non-porous, heavy jet tracked fabric of static pressure entangled staple fibers consisting of (m-phenylene isophthalamide).

Two types of batts of Nomex (No■e @ aromatic amide staple fiber) were made by an air deposition process of the type described in U.S. Pat. No. 3,787,074 of Zafiroglu.・Manufactured by De Nemoise and made from poly(Ill-phenylene isophthalamide) polymer.
2-a is 2 denier 12.2 dtexl length 1.5
inches [3,8 cm] and 174 inches [0,84 cm]
87733 blend of 1 staple fiber. Bat 2-b has 2 decors [2, 2
dtexl length 1 inch [2,5c+sl (7) made of staple fist fibers. Bats 2a and 2b have a basis weight of 7.0 and 8.6 ounces, respectively, 7 square yards [
237 and 292 g/m 2 ] with a columnar hydraulic jet. Table 2 shows the order of jet processing. J, first 5 columns of g; B,...
The jets C of the other row collide with one side of the jet C;

Total Exl spent on processing bats 2-a and 2-b 8
i and the properties of the m#l cloth from which the energy was obtained, as well as the third
The average strip tensile strength of the batts shown in the table is plotted in the accompanying drawings. In this case as well, it is shown that the tR-ga cloth of this example is superior in strength to the conventional 1ata cloth of the same basis weight.

2-b Basis weight? , 0 8.8 oz/yd 2[2371[292] [g/m2] Energy impact performance Hp-hr 1t+r/Ibl10.052 0.03
8 [10' JN/kgl [1,371 [1,031]
Energy Hp-hr/lbmO, f15 0.4fl [10@
J/kgl [3,841 [2,711 Grab Strength MD, lb/in 118 119 [N/cml [207] [208] XD, lb/i
n 118 10B tN/cIIl [203] [1881 Strip Tensile Strength End MO, Footnote 1 8.13 5.7 [Footnote 2] [0,441 [0,291XD, Footnote 1
7.0 5.3 [Footnote 21 [Q. Strip tensile strength in units (lb/inch) (oz/square yard)2, values in brackets are strip tensile strength in (N/cm)/(g/m2) Example 3 This example is Length 1.35 denier [1.5 dtexl
, 3/4 inch [1.8 cm 1 ] of poly(ethylene terephthalate). This fibrous fabric has excellent tensile properties and fray resistance. Four types of fiber cloths were made by the following method.

Place bat 3-a on L of screen C, 10 yards/
It is treated sequentially by hydraulic jets from orifice set C while advancing at a speed of [9,14 m/min]. The bat was treated with seven rows of jets. The first four rows of jets treated one side of the bat, and the remaining three rows treated the other side of the bat. The jet supply pressure was 200 psi [1380 kPal for the first row of jets and 2800 psi [1929 kPal] for the remaining rows of jets.
It was 0 kPal.

bar,) a-b are Zafiroglu U.S. Pat. No. 3,78
No. 7.074, and then treated with seven rows of jets, advancing at a rate of 10 yards/min [9.14 m/min]. The first four rows of jets treated one side of the bat, and the last three rows treated the other side of the bat. The bat rests on the support screen C while under the first row of jig x −/
It is above screen A in rows and above screen B in the last three rows. The first row of jets has orifice set C.
It is supplied at a pressure of 1000 psi [88 sokpal. The next three rows each contain 500 liters from the orifice set.
, 1500, and 2000 psi [3450, 1034
0, and 13780 kPal (7) pressures. The last three rows each contain 500 liters from the orifice set,
1500, and 2000psi [3450, 10340
, and a pressure of 13780 kPa.

3-c and 3-d were made using the same air deposition equipment as used for bat 3-b, but the MD
Increased force direction strength. 13.6 yards/cut 12.
Batts 3-c and 3-d were treated with a train of hydraulic jets while advancing at a speed of 4 m/min. rose) 3-c
(7) A row of jutes supplied at a pressure of 500 psi [3450 kPal (7) through orifice set E on one side of the butt on screen C and then on screen B1-, and orifice set E. The other side of the batt was treated with four rows of jets delivered at a pressure of 2000 ps i [13780 kPal through The first row of jets was omitted. This process was repeated for butt 3-d, but the first row of jets was replaced with two rows of jets (which were used to treat only the first face), and the first jet was injected through orifice B with 13QGpsi [ 896QkP
The second diode 1'/t was fed through orifice E at 500 pgi [3450 kPal.

The energy expended to make the entire Exl product and the four batts into the am fabric of the present invention and the resulting ffl fabric dispersibility are shown in Table 4. The average strip tensile strength plotted in the accompanying drawings shows the strength advantage of the m-cloth of this example over a similar conventional fibrous fabric of the same basis weight.

Table 4 Fiber cloth batt of Example 3 Company 1 Needle S Needle 4 Basis weight oz/yd 221.3 11.0 7.8 8.2 [
g+w/a+'] [7!2] [3731[2f
14] [2781Exl product Hp-hr lfr/1bllIO,0580,0+2
4 0.0354 0.0337 [10' JN/kg
l '[1,471[0,331[0,93] [0,
811] Energy hp-hr/lb O, 410, 290, 7+ 0.7
1 [10” J/kgl [2,421 [1,71]
[4,19] [4,19] Grab strength MO, lb/in 35? 231 15fl 1B
? [N/cml [8251[404] [273]
[2112]XD, lb/in 324 189
93 95[N/c+sl [5871[3311[1
831 [18fll strip tensile strength book MO8, 38, 91+, 69.5 [0,43] [0,48] [0,80] [0,4
9]XD 7.7? , 4 4.8 4.0jO, 39
] [0,38] [0',24] [0,211 intersection q
Number of extensions >100 >100 122 55 Jet track per inch 20 20 20 10 [1 cm W
, bow] [7,9] [7,9] [7,13] [3
, 9] Refer to footnotes in Table 1 Example 4 In this example, polyethylene terephthalates of various deniers and lengths were blended together to form a bat, and this was treated with a columnar water stream to produce the present invention. Creates a strong, pore-free, heavy non-woven fabric.

Three batts of compounded polyester va#I were made using the same air deposition method as in Example 2. The two types of bats 4-a and t-b are 6 denier [El, 7 dtexl, length 1-1
/4 inch [3,2c+a,] fiber and 1.35 denier [1,5 dtex], 1/4 inch [0,8
Made using a 50150 blend of 4 cal fibers.

The third Batt C is an 87/33 blend of these fibers. These bats were placed on the 11th screens C, A, and sun, and a columnar water jet fed through the orifice 110 was applied at a speed of 10 yards 1 min [9,14 t
m1 minute]. In screens C and A, the jet enters the opposite face. The order of jet supply pressure is 5th.
shown in the table. The energy expended in processing the entire Exl product and the three batts, as well as the properties of the resulting fiber fabrics, are shown in Table 6, and the average strip tensile strength is plotted in the accompanying drawings. These data demonstrate that the fiber fabric of this example has a strength advantage over a similar fabric of the prior art method of the same basis weight.

Table 5 C200 [1380] C200 [13803A 50
0f3450] A 500 [34501A 1800
[124001A 1500 [10340]A 200
00[137EIO] A 18QO[124001B
500 [3450] A 2000 [13?80] B
1800 [12400] A 2000 [13780
] B 2000 [+3?80] B 500 [3450
] B 1500 [10340] B 1800 [1240 QI B 2000 [137801 B 2000 [13780] Table 6 Fiber cloth Beyuyu of Example 4 4a 411 Illusion basis weight oz/yd' 11.1 7.3 8.8 [g /■2
] [308] [2471 [302] E! ■Product Hp-hr lbf/lb, 0.018 0.022
0:033F10' JN/kgl [0,47]
[0,581[0,87]Energy Hp-hr/lb O,3θ O,C90,73[1(
1' J/kgl C2,301 (2,891 "4.3
11 Grab strength 811, lb/in 213 190 221 [N/c
al [373] [3331[387]XD, lb/
in 185 159 184IN/cml [341
1 [278] [322] Strip tensile strength MD 10.8 11.2 11.9 [0,58] [0,58] [0,51]X0 8.
7 9.7 8.4 [0,45] [(1,501[0,431 Number of alternating V extensions 80 51 52 Per inch of track during jet 40 40 40 [1cm-,t] [15,71[15, 7] [1
5,73 Houses Table 1 Footnote Reference Example 5 This example is 15 denier [18,7 dtexl], 1.5 inches [3,8 cm] long and! , 8 denier [2d
texl, 1/4 inch [0,84c+++] 6
6 shows a method of making a nonwoven fabric from a 50150 blend of nylon 6 stable fibers. This formulation of tIafa is used in Fililoglue's US Patent No. 3,7θ? ,07
It is made into a vat using an air deposition apparatus of the type described in No. 4. The bat is mounted on a screen and advanced through a line of static IL pressure jets at a speed of 8.0 yards and 7 minutes [7.3 m/min]. The order of processing is as follows.

CC500 [34501 0B 500 [3450] D B 1500 Exit 03401 CB 2000 [13780] D E500 [34501 DE 1500 [10340] CE 2000 The jet is one side of the bat The jet then collides with the other side of the bat at the end of screen E. The result of this treatment is a strong, fray-resistant, pore-free, heavy weight nonwoven fabric. This fibrous fabric has superior tensile strength to conventional H/1ys fabrics, as shown by the plot of average strip tensile strength versus basis weight, whose properties are shown in Table 7.

Table 7 Example 5 m#I Fabric basis weight 02/ma d213 [g/m2] [4411 Ex ■ Product Hp-hr tbfltb, 0.023 [10' J
N/kg] [O, EIO] Energy Hp-hr/lb1. IO, 34 [10' J/kgl [2,011 Grab Strength MO, lb/in 240 [N/cml [4201 XD, lb/in 202 [N/cIll] [354] Strip Tensile Strength MD, Footnote 18. 3 [Footnote 21 [0,43] Strip tensile strength in degrees (lb/inch) (oz/square yard)2, values in parentheses are strip tensile strength in (N/cm)/(g/e2)

[Brief explanation of the drawing]

The accompanying drawing is a graph plotting strip tensile strength against basis weight comparing the fabric of the present invention to a conventional fabric.

Claims (1)

[Claims] 1. Basis weight is 200 to 850 g/m 2. The grab strength is at least 18 ON/cm2, the strip tensile strength is at least 0.2 El (N/cm)/(g/m2), and the fraying resistance is characterized by a number of alternate extensions of at least 50. A heavy, pore-free nonwoven fabric made by intertwining stable fibers of synthetic organic polymers using water pressure. 2.Basic weight is 240-510 g/m2. Grab strength is 245-875 N/cm, strip tensile strength is 0.
38-0.77 (N/cm)/(g/m2)', fraying resistance is at least 50 times of alternating stretching, 1
Nonwoven fabric according to claim 1, having from 3 to 10 tracks per cm. 3. The stable fiber is 1-18 dtex and has a length of 0.8-5 cts!
The nonwoven fabric according to item i41. 4. The polymer is poly(p-phenylene terephthalamide)
The nonwoven fabric according to claim 1 or 2. 5. The nonwoven fabric according to claim 1 or 2, wherein the polymer is poly(+a-phenylene inphthalamide). 6. The nonwoven fabric according to claim 1 or 2, wherein the polymer is poly(ethylene terephthalate). 7. A synthetic organic polymer stable fiber batt is supported on the second side of a perforated screen, and the batt is treated with the water stream while being moved in a direction perpendicular to the rows of thin columnar water streams. In the method of manufacturing a heavy, pore-free nonwoven fabric, for a strong cm fabric, the cm fabric has a basis weight of 200~200 cm.
850 g/m 2-t', length 0.8-5CI11
made from a batt consisting essentially of a stable fiber of 1 to 18 dtex 117 y, the batt being preagglomerated and immediately after wetting treated with a stream of water to remove a portion of the stable fiber from one side of the band. 1. Pass through the thick part of the bat from the surface of the bat. The row of water streams is arranged at a frequency of 3 to 1 O per am and is supplied with water from an orifice with a diameter of 0.13 to 0.22 mm. Method. 8. The basis weight is 240-510 g/m2, #ll
Fiber length is 1.3-3.8 cm, dtex is 1.4
~2.5 dtez and the orifice frequency is 1 a
There are 3 to 6 pieces per m, and the water flow is 8880 to 22740
8. The method according to claim 7, wherein the pressure is supplied at a pressure of kPa.