JP2005154918A - Nonwoven fabric and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nonwoven fabric whose interfiber interlacements in a constant direction and in a direction different from the constant direction can be increased to exhibit a good strength and a good elongation and which is suitable for three-dimensional forming treatments, and to provide a method for producing a nonwoven fabric, by which such the nonwoven fabric can simply be obtained. <P>SOLUTION: The nonwoven fabric suitably used for three-dimensional forming treatments is obtained by applying a needle punching treatment to a nonwoven fabric material 16 with a needle punching treatment apparatus 11 in a constant direction and then applying a needle-punching treatment in a direction different from the constant direction. It is preferable on a point capable of improving the strength and the elongation all around that the different direction is a direction orthogonal to the constant direction. The nonwoven fabric is useful for a deep drawing treatment among the three-dimensional forming treatments. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a nonwoven fabric obtained by performing needle punching in a plurality of directions, and preferably used for three-dimensional molding such as deep drawing, and a method for producing the same. More specifically, the nonwoven fabric material that has been subjected to needle punching in the longitudinal direction is cut in a direction perpendicular to the longitudinal direction, the cut nonwoven fabric material is rotated by 90 °, and needle punching is performed in the direction orthogonal to the longitudinal direction. The present invention relates to a nonwoven fabric obtained and a method for producing the same.

  As one of high-value-added non-woven products, three-dimensional molding using non-woven materials is actively performed. Usually, non-woven fabrics made of staple fibers and needle punched are difficult to be plastically processed, and therefore, three-dimensional molded processed products are produced by applying various innovations to raw materials, nonwoven fabric forming methods, three-dimensional molding processing methods, etc. ing.

For example, in the first prior art, when two layers of mats are supplied in a stacked state using two card devices, a needle punched portion and a needle punched portion are omitted, and three-dimensional forming is performed. In addition, the omission portion of the needle punching serves as a stretch allowance to enhance the shape retention (see Patent Document 1). In the second prior art, a non-woven fabric is obtained from fibers made of a thermoplastic resin, which is plastically deformed to produce a stretchable non-woven fabric having a number of wrinkles in a certain direction (see Patent Document 2). Furthermore, in the third prior art, a stretchable nonwoven fabric is obtained by subjecting a web using crimpable fibers to needle punching and heat treatment (see Patent Document 3).
Japanese Unexamined Patent Publication No. 2000-6705 (Page 2, Page 3, and FIG. 3) JP-A-9-324352 (Pages 2 and 3) Japanese Patent Laid-Open No. 3-69647 (first and third pages)

  However, since the mat in the first prior art has only one direction of needle punching, the stretchability is biased when three-dimensional forming such as drawing forming is performed, and uniform strength is not obtained. It is not suitable for drawing. In such a nonwoven fabric, the orientation of the fibers and the direction of the needle punch are in one direction, and the fibers flow in that direction, thereby forming the direction, so that the strength in a direction different from that direction becomes weak. When a deep drawing process is performed using this nonwoven fabric, the nonwoven fabric is stretched uniformly in the vertical and horizontal directions, and the nonwoven fabric may break in the lateral direction where the constraint is weak.

Although it is conceivable to obtain a three-dimensional molded article using the nonwoven fabric obtained by the second prior art, it is unsuitable for three-dimensional molding such as deep drawing molding as described above because the direction of wrinkling is one direction. It is. It can also be applied to low-weight nonwoven fabrics, but it is difficult to get wrinkles, especially when the weight per unit area exceeds 100 g / m ^2, and it is difficult to obtain stretchability, which makes it difficult for wrinkle processing. Restrictions are added.

  It is also conceivable that the stretchable nonwoven fabric disclosed in the third prior art is molded to obtain a three-dimensional molded product. However, when a three-dimensional molding process is performed on a nonwoven fabric using crimpable fibers, the stretch unevenness of the fibers becomes conspicuous when crimping is expressed, and the texture of the nonwoven fabric deteriorates. There is a problem that it is difficult to obtain a three-dimensional molded product.

  The present invention has been made paying attention to such problems existing in the prior art. The purpose is to increase the entanglement between the fibers in a certain direction and the direction different from it, and to exhibit good strength and elongation, and to easily create a nonwoven fabric suitable for three-dimensional molding and such a nonwoven fabric. It is providing the manufacturing method of the nonwoven fabric which can be obtained.

  In order to achieve the above object, the nonwoven fabric of the invention according to claim 1 is a needle punch along a direction different from the certain direction after needle punching is performed along a certain direction with respect to the nonwoven material. It is obtained by processing.

In the nonwoven fabric of the invention according to claim 2, in the invention according to claim 1, the different direction is a direction orthogonal to a certain direction.
The non-woven fabric of the invention according to claim 3 is used for the three-dimensional molding in the invention according to claim 2.

The nonwoven fabric of the invention according to claim 4 is the invention according to claim 3, wherein the three-dimensional forming process is a deep drawing process.
The manufacturing method of the nonwoven fabric of the invention according to claim 5 is characterized in that after punching the nonwoven fabric material along a certain direction, needle punching is performed along a direction different from the certain direction. It is what.

According to the present invention, the following effects can be exhibited.
According to the nonwoven fabric of the invention described in claim 1, it is possible to increase the entanglement between fibers in a certain direction and a direction different from the constant direction, thereby exhibiting good strength and elongation, and an effect that it is suitable for three-dimensional molding processing. Play.

According to the nonwoven fabric of the invention described in claim 2, in addition to the effect of the invention according to claim 1, the strength in a certain direction and a direction orthogonal thereto can be improved.
According to the nonwoven fabric of the invention of claim 3, in addition to the effect of the invention of claim 2, the nonwoven fabric can be suitably used for three-dimensional molding.

According to the non-woven fabric of the invention described in claim 4, in addition to the effect of the invention according to claim 3, the non-woven fabric can be suitably used particularly for deep drawing.
According to the method for manufacturing a nonwoven fabric of the invention according to claim 5, the needle punching process is performed along a certain direction, and then performed along a direction different from the needle punching process. The non-woven fabric suitable for three-dimensional forming can be obtained.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The nonwoven fabric of this embodiment is obtained by subjecting a nonwoven fabric that has been subjected to needle punching along a certain direction to needle punching along a direction different from that direction. Here, the directionality of the needle punching process is to punch the needle from above, below or above and below the nonwoven fabric to entangle the fibers, but since the nonwoven fabric simultaneously moves in one direction while punching, that direction It means that there is a direction. By performing needle punching in a certain direction and a direction different from that direction, the nonwoven fabric is entangled (entangled) with fibers in a certain direction, and at the same time, the fibers are also entangled in a different direction. Therefore, the nonwoven fabric has a good strength in a certain direction and a different direction, and can exhibit excellent elongation.

  The different direction may be any direction that intersects a certain direction, but it is most preferable that the direction is orthogonal because the strength and elongation of the nonwoven fabric can be evenly distributed over the entire circumference. When a three-dimensional molding process is performed using this nonwoven fabric, the nonwoven fabric is stretched so as to be more uniform in the vertical and horizontal directions. Therefore, by configuring the nonwoven fabric in this way, it can be made suitable for three-dimensional molding such as deep drawing.

  Next, the suitable manufacturing apparatus and manufacturing method for obtaining the above nonwoven fabric are demonstrated. First, staples (short fibers) weighed in advance to have a predetermined weight using a spreader are opened, and then a nonwoven fabric material (parallel web or mat) is formed using a roller card. Next, as schematically shown in FIGS. 1 to 3, needle punching is performed using a needle punch processing device 11. That is, the apparatus main body 12 includes a pair of upper and lower bases 13 that form a square disk shape. Each base 13 is provided with through-holes 14 at vertical and horizontal positions at regular intervals. A non-woven fabric material 16 before being subjected to needle punching can pass through a passage 15 formed between both bases 13.

  A needle support plate 18 having a large number of needles 17 projecting downward is disposed above the base 13 so as to be movable up and down. The needles 17 are provided in the same arrangement so as to be inserted through the through holes 14 provided in the pair of bases 13. The needle support plate 18 is lowered and the needle 17 penetrates the through hole 14 of the base 13 so that the nonwoven fabric material 16 passing through the passage 15 is subjected to needle punching.

  When needle punching is performed using such a needle punching device 11, the nonwoven fabric material 16 is continuously passed through the passage 15 between the pair of bases 13. On the other hand, the needle support plate 18 is lowered, the needles 17 are passed through the through holes 14 of the base 13, and the needles 17 are raised from the bottom dead center. This operation is performed in accordance with the moving speed of the nonwoven fabric material 16. Thereby, needle punching is performed in one direction of the nonwoven fabric material 16.

  As shown by a two-dot chain line in FIG. 2, the non-woven fabric material 16 that has come out of the apparatus main body 12 is cut into a certain length, for example, a substantially square shape. Then, as shown in FIG. 3, the nonwoven fabric material 16 is rotated by 90 °, arranged so as to have an overlapping portion 16 a with the preceding and following nonwoven fabric materials 16, and subjected to needle punching again in the same manner as described above. In this way, a nonwoven fabric 19 is obtained in which the nonwoven fabric material 16 is given directionality by needle punching in both the longitudinal direction and the lateral direction.

  Next, an apparatus and a method for performing a deep drawing process as a three-dimensional molding process using the obtained nonwoven fabric 19 will be described. As shown in FIG. 4, a columnar molding recess 21 is provided through the center of the cylindrically formed die 20. On the die 20, a heel presser 22 is disposed that presses the nonwoven fabric 19 to stop wrinkles. A punch 23 of a press molding machine is disposed above the molding recess 21 so as to be movable up and down. The nonwoven fabric 19 pressed by the presser foot 22 is pushed into the molding recess 21 to stretch the nonwoven fabric 19, and a deep-drawn molded product 24 is formed. It is configured to manufacture.

  In order to manufacture the nonwoven fabric 19 formed by performing needle punching in a plurality of directions, first, a nonwoven fabric material 16 (web) is prepared from a staple such as polylactic acid or polyester by a card device. Then, as shown in FIG. 1, the nonwoven fabric material 16 is moved in a certain direction through the passage 15 of the needle punching device 11, and the needle 17 is moved up and down to perform needle punching along the certain direction. A non-woven fabric material 16 is obtained. At this time, the fibers constituting the nonwoven fabric material 16 flow in a certain direction and are entangled with each other, and a direction having a large binding force is expressed in that direction. Subsequently, as shown in FIG. 2, the obtained nonwoven fabric material 16 is cut in a direction orthogonal to the certain direction, arranged as shown in FIG. 3, and subjected to needle punching again. At this time, the fiber exhibits a directionality having a large binding force in the orthogonal direction. In this way, the nonwoven fabric 19 having high strength in a plurality of directions and large elongation can be obtained.

  Subsequently, in order to perform deep drawing processing on the obtained nonwoven fabric 19, the nonwoven fabric 19 is placed on the die 20 as shown in FIG. In this state, as shown in FIG. 5, the punch 23 of the press molding machine is lowered, and the nonwoven fabric 19 is pushed into the molding recess 21 to stretch the nonwoven fabric 19 to obtain a deep-drawn molded product 24 having a drawing depth d. Since the nonwoven fabric 19 has high strength and elongation in a certain direction and a direction perpendicular thereto, the nonwoven fabric 19 has good followability when a deep drawing process is performed, and can maintain a good three-dimensional shape.

The effect exhibited by the above embodiment will be described.
-The nonwoven fabric 19 of this embodiment is obtained by giving along the direction different from a longitudinal direction, after giving a needle punch process along a longitudinal direction. For this reason, the entanglement between the fibers in the longitudinal direction and two different directions can be increased, and the strength and elongation of the nonwoven fabric 19 in both directions can be improved. When the different direction is the direction orthogonal to the longitudinal direction, the strength and elongation of the nonwoven fabric 19 as a whole can be improved more uniformly. Therefore, such a nonwoven fabric 19 can be suitably used for three-dimensional molding, particularly deep drawing, and the resulting molded product is excellent in shape retention. As a result, deep-drawn molded products 24 by deep-draw molding are used for packaging materials such as parts packages, cosmetic packages, life-related materials such as garbage trays, agricultural and horticultural materials such as nursery pots and planting pots, and automobiles. It can be used as related materials and is very useful in industry.

  The nonwoven fabric 19 of the present embodiment has a simple operation in which the needle punching process is performed along the longitudinal direction and then the needle punching process is performed again along the direction different from the needle punching process. A nonwoven fabric with improved strength can be easily obtained. That is, the nonwoven fabric 19 suitable for deep drawing can be obtained simply and easily by simple improvement of the needle punching method without using special raw materials or special equipment.

Hereinafter, the embodiment will be described more specifically with reference to examples and comparative examples.
(Example 1)
Polylactic acid staples (fineness: 2.2 dtex, fiber length: 51 mm) were opened twice with a spreader, and a parallel web was produced with a roller card. The parallel web was subjected to needle punching with a needle density of 50 needles / m ² along the longitudinal direction to obtain a nonwoven fabric material 16. Subsequently, the nonwoven fabric material 16 is equally cut in the short direction perpendicular to the longitudinal direction, and each nonwoven fabric material 16 is rotated by 90 ° so that the end portions 10 cm of the nonwoven fabric material 16 become overlapping portions 16a. After the lamination, needle punching with a needle density of 50 / m ² was performed again. That is, the nonwoven fabric 19 which gave the needle punch process from two directions, the vertical direction and a horizontal direction, was obtained. Sample 1 having a basis weight of 90 g / m ² was used.

Similarly, sample 2 was a nonwoven fabric having a needle density of 75 needles / m ² in the first needle punching process and a needle density of 75 needles / m ^{2 in} the second needle punching process and a basis weight of 90 g / m ² . Sample 3 was a nonwoven fabric 19 having a needle density of 100 needles / m ² in the first needle punching process, a needle density of 100 needles / m ^{2 in} the second needle punching process, and a basis weight of 90 g / m ² . About these nonwoven fabrics 19, the tensile strength and elongation rate were measured by the JIS L1913 general short fiber nonwoven fabric test method. Further, the holding interval of the sample at this time was set to 100 mm.

  By the way, the properties of the nonwoven fabric 19 in the deep drawing process are required to have a large strength and elongation value and a ratio of the elongation rate in the vertical and horizontal directions close to 1. When the needle density of the nonwoven fabric production method is further increased, the tensile strength is increased in both the longitudinal direction and the transverse direction of the nonwoven fabric, and the elongation rate tends to be small in the longitudinal direction and large in the lateral direction. The needle density of the first needle punching process and the second needle punching process do not need to be the same number, and if the needle density is variably adjusted, the nonwoven fabric 19 that extends in the vertical and horizontal directions has the same elongation in the vertical and horizontal directions. Can be produced. In this case, since the elongation percentage of the nonwoven fabric varies depending on the fineness and fiber length of the staple used, it is naturally necessary to adjust the needle density.

  Next, a three-dimensional molding process is performed. The non-woven fabric 19 produced by the above method is mounted on a cylindrical deep drawing mold composed of the above-described die 20 shown in FIG. 4, the punch 22, the punch 23 of the press molding machine, etc., and the punch 23 of the press molding machine is lowered. By doing so, deep drawing was performed. As shown in FIG. 5, the drawing depth d of the punch 23 was 30 mm for the samples 1 and 2, 35 mm for the sample 3, the molding set temperature 80 ° C., the actual mold temperature 73 ° C., and the molding time 5 minutes. The results are shown in Table 1. FIG. 6 shows the deep-drawn molded product 24 obtained. As a result, it was possible to obtain a deep-drawn molded article 24 of the nonwoven fabric 19 having excellent drawing properties with a drawing height / drawing diameter ratio of 0.45. Further, the good shape of the deep-drawn molded product 24 described in Table 1 means that the deep-drawn molded product 24 is free from cracks, breaks, and voids and has excellent texture.

Also, the first non-woven needle density of the needle punching is 100 / m ^2, 2 time is 100 / m ² weight per unit area 100 g / m ² in, 150 g / m ^2, 200 g / m ^2, similarly The deep drawing was processed. When the punch drawing depth was 35 mm, it was possible to obtain a deep drawing molded product 24 having excellent drawing characteristics with drawing height / drawing diameter: 0.41 to 0.45.

  If it is this manufacturing method, you may use not only the parallel web as the nonwoven fabric material 16 but a random web or a cross web, Furthermore, the nonwoven fabric material 16 which once performed needle punching is laminated | stacked on another nonwoven fabric material 16. May be. In this case, the direction of the first needle punching may be arranged so as to be orthogonal to the direction of the second needle punching. That is, it is only necessary to perform needle punching not only in the longitudinal direction of the nonwoven fabric material 16 but also in the width direction. Furthermore, it is also possible to perform needle punching from three directions, that is, the longitudinal direction of the nonwoven fabric material 16, the direction shifted by 120 ° from the longitudinal direction, and the direction shifted by 240 ° from the longitudinal direction.

  Since the nonwoven fabric material 16 recovers strain only by cold forming, thermoforming is required. Therefore, thermoplastic fibers and the like are blended, and the shape of the three-dimensional molded product is maintained by heating, that is, thermal bonding is performed. If the heating temperature is too low, it will be difficult to maintain the shape by thermal bonding, and if it is too high, the shape will become paper-like and the texture of the nonwoven fabric material 16 will be lost. The following are appropriate. In order to maintain the shape, all the composition of the nonwoven fabric material 16 is made of polyethylene, polypropylene, and polyolefins including copolymers and modified materials thereof, polyamides such as nylon 6, nylon 66, and nylon 12, polyethylene terephthalate, poly It may be a thermoplastic fiber such as butylene terephthalate, polyester such as polylactic acid, polycarbonate, polyetherimide, polyphenylene sulfide, polyether ketone, or other thermoplastic fibers other than those mentioned above, and other thermoplastic fibers such as natural fibers and chemical fibers. You may mix | blend things other than a fiber. In order to maintain the shape, it is not necessary to be concerned with the thermoplastic fiber, and it may be replaced with a thermoplastic powder, resin, emulsion, thermosetting fiber, powder, resin, emulsion or the like.

(Example 2)
Using a polylactic acid staple (fineness: 1.7 dtex, fiber length: 51 mm), a nonwoven fabric material 16 having a needle density of 100 / m ^{2 and} a basis weight of 154 g / m ² was produced. The nonwoven fabric material 16 was cut in a direction perpendicular to the longitudinal direction, rotated 90 ° and placed on the nonwoven fabric material 16 having a basis weight of 13 g / m ² , and subjected to needle punching at 100 pieces / m ² to obtain a laminated nonwoven fabric. Using this laminated nonwoven fabric, deep drawing was performed. The drawing depth d of the deep drawing process was 30 mm, the molding set temperature was 80 ° C., the actual mold temperature was 73 ° C., and the molding time was 5 minutes. The results are shown in Table 1. As a result, it was possible to obtain a deep-drawn molded article 24 having excellent drawing properties at drawing height / drawing diameter: 0.49.

(Example 3)
A non-woven fabric having a needle density of 200 / m ² using polyester staples (fineness: 2.2 dtex, fiber length: 51 mm) is cut in the transverse direction perpendicular to the longitudinal direction, rotated 90 °, and 10 cm at the end portion of the nonwoven fabric material 16 Were laminated so as to be an overlapping portion 16a, and needle punching with a needle density of 50 / m ² was performed again to obtain a nonwoven fabric 19. The basis weight at this time is 160 g / m ² , the drawing depth d of the deep drawing process is 40 mm, the molding set temperature is 80 ° C., the actual mold temperature is 73 ° C., and the molding time is 5 minutes. It was set to 5. The results are shown in Table 1. As a result, it was possible to obtain a deep-drawn molded product 24 having a drawing height / drawing diameter of 0.57 and excellent shape.

表１に示したように、実施例１ではニードル密度を変えても引張強さ及び伸び率を縦方向及び横方向に発揮することができ、深絞り成形品２４の形状性を良好に維持することができた。また、実施例２及び実施例３においても深絞り成形品２４の形状性を良好に維持することができた。

As shown in Table 1, in Example 1, even if the needle density is changed, the tensile strength and the elongation can be exhibited in the vertical direction and the horizontal direction, and the shape of the deep-drawn molded product 24 is maintained well. I was able to. Moreover, also in Example 2 and Example 3, the shape of the deep-drawn molded product 24 could be maintained satisfactorily.

(Comparative Example 1)
The same non-woven fabric material (parallel web) was produced using the same polylactic acid staple as in Example 1. The obtained nonwoven material was subjected to needle punching with a needle density of 50 / m ² . The basis weight was 90 g / m ² and Sample 6 was obtained. Similarly, sample 7 was a nonwoven fabric subjected to needle punching with a needle density of 100 / m ² , and sample 8 was a nonwoven fabric subjected to needle punching with a needle density of 200 / m ² . Using the produced non-woven fabric, deep drawing was performed. The results at this time are shown in Table 2. Here, the meaning of measurement difficulty described in Table 2 will be described. This nonwoven fabric has fiber orientation and needle punch direction only in the longitudinal direction. The strength properties in the transverse direction are weak because the entanglement force is weak, and the strength is weak, and the elongation rate shows a large value, but the nonwoven fabric does not stretch evenly, but stretches while generating unevenness in passing through. It was difficult to measure.

  The produced deep-drawn molded product had a drawing height / drawing diameter of 0.30 to 0.34 when the punch drawing depth was 25 mm. In spite of the fact that the punch drawing depth was shallower than in Example 1, it was broken from the longitudinal direction in which the needle punching was performed, and a deep drawing molded product having excellent shape could not be obtained. In addition, the poor shape of the deep-drawn molded product described in Table 2 means that the deep-drawn molded product has cracks, breaks, or unevenness in appearance, and the formation is poor.

(Comparative Example 2)
A similar non-woven material (parallel web) was produced from the same polylactic acid staple as in Example 1. The nonwoven fabric material was cut in a direction perpendicular to the longitudinal direction, rotated 90 °, arranged side by side so that the ends of the web overlapped, and subjected to needle punching with a needle density of 100 / m ² . The basis weight was 90 g / m ² and Sample 9 was obtained. Using the produced nonwoven fabric material, deep drawing was performed. The results at this time are shown in Table 2. The produced deep-drawn molded product had a drawing height / drawing diameter of 0.37 when the drawing depth was 25 mm, but it was broken from the longitudinal direction in which needle punching was performed in the same manner as in Comparative Example 1, and the shape was low. An excellent deep drawing product could not be obtained.

(Comparative Example 3)
A nonwoven fabric material (cross web) was prepared from a roller card and a cross wrapper using polyester staples (fineness: 3.3 dtex, fiber length: 64 mm). The cross web needle density 200 yarns / m ² of needle punching charity was basis weight 125 g / m ² nonwoven fabric was used as the sample 10 was subjected to molding aperture similar depth. The results at this time are shown in Table 2. The drawn deep-drawn product has a drawing height / drawing diameter of 0.50 when the drawing depth is 35 mm. However, since the nonwoven fabric portion mainly hits the bottom of the punch of the deep drawing mold, As a result, it was not possible to obtain a deep-drawn molded product excellent in shape.

表２に示したように、比較例１〜３ではニードルパンチ加工が一方向のみであることから、深絞り成形品２４の形状性が不良であった。

As shown in Table 2, in Comparative Examples 1 to 3, since the needle punching is only in one direction, the shape of the deep-drawn molded product 24 was poor.

In addition, this embodiment can also be changed and embodied as follows.
When needle punching is performed along a direction different from a certain direction, needle punching can be performed in a plurality of directions different from the certain direction, that is, in three or more directions. In this case, it is desirable to set different directions so that a certain direction and different directions are evenly positioned on the entire circumference. If it does in this way, the intensity | strength and elongation of the nonwoven fabric obtained can be made further uniform over a perimeter.

・ It is possible to adopt press forming, vacuum forming, etc. as the three-dimensional forming.
-When performing a needle punch process along the direction different from a fixed direction, it is also possible to move the nonwoven fabric raw material 16 to a different direction, and to move the needle punch processing apparatus 11 to a different direction.

Further, the technical idea that can be grasped from the embodiment will be described below.
(1) The method for producing a nonwoven fabric according to claim 5, wherein the different direction is a direction orthogonal to a certain direction. According to this manufacturing method, it is possible to obtain a non-woven fabric with improved strength in a certain direction and a direction perpendicular thereto by a simple operation.
(2) According to the above technical idea (1) configured to perform needle punching along the fixed direction, then cut the nonwoven fabric material in the orthogonal direction, and change the direction by 90 ° to perform needle punching. The manufacturing method of the nonwoven fabric as described. According to this manufacturing method, needle punching can be easily performed in a direction orthogonal to a certain direction without changing the direction of the needle punching device.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic explanatory drawing which shows the needle punch apparatus in embodiment. The top view of FIG. The top view which shows the state which performs a needle punch process in a horizontal direction after a vertical direction. Sectional drawing which shows a deep drawing processing apparatus. Sectional drawing which shows the deep drawing apparatus of the state after performing deep drawing. Sectional drawing which shows a deep drawing molded article.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Needle punch processing apparatus, 16 ... Nonwoven fabric material, 19 ... Nonwoven fabric.

Claims (5)

A nonwoven fabric obtained by subjecting a nonwoven fabric material to needle punching along a certain direction and then performing needle punching along a direction different from the certain direction. The nonwoven fabric according to claim 1, wherein the different direction is a direction orthogonal to a certain direction. The nonwoven fabric of Claim 2 used for a three-dimensional shaping | molding process. The nonwoven fabric according to claim 3, wherein the three-dimensional forming process is a deep drawing process. A method for producing a nonwoven fabric, comprising performing needle punching along a certain direction on a nonwoven fabric material, and thereafter performing needle punching along a direction different from the certain direction.

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