JP2010007190A - Back surface material of non-slip mat and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a back surface material of a non-slip mat, mainly usable for the non-slip mat laid on a floor carpet in a car, hardly slipping on the carpet, and having comparatively light weight and excellent sound absorbing properties. <P>SOLUTION: The back surface material of the non-slip mat is constituted of 10-40% of at least one of a thick-diameter fiber having a fineness of not less than 30 dtex, and 40-90% of at least one of a fine-diameter fiber having a fineness of not more than 15 dtex. The fine-diameter fiber is interlaced densely and is unevenly distributed to the reverse side of a punched face to make the surface of the mat soft and bulky, and the thick diameter fiber is hardly interlaced and mainly remains at the punched face side. The punched face side is subjected to singeing treatment. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention mainly relates to a non-slip mat back surface material that is used for a non-slip mat laid on a floor carpet in an automobile, does not slide on the carpet, is relatively light, and has excellent sound-absorbing properties, and a manufacturing method thereof.

  An automobile floor carpet is generally made of a tufted carpet or a needle-punch napped carpet, and the carpet is spread over the entire floor surface inside the automobile and bonded together (see FIG. 8). Since this floor carpet cannot be easily replaced once it has been adhered to the entire surface, a non-slip mat that is partially laid under the seat, which is particularly dirty, is sold as an optional item, and has achieved considerable sales results as an automotive product. is doing. The non-slip mat is usually made of the same material as the floor carpet.

  Since this non-slip mat is dangerous because it slips on the floor carpet when its back is a jute or latex backing of the base fabric, the anti-slip mat is made of PVC or rubber so as not to slip on the floor carpet. Are applied and formed on the entire back surface. Even if a small protrusion is formed on the entire back surface of this anti-slip mat, it cannot be said that the anti-slip property is perfect, and it becomes slippery when the floor carpet surface gets wet with rainwater or the like. For this reason, as for the non-slip mat, PVC or a rubber sheet processed into a spike shape is bonded to the back surface of the mat to improve the anti-slip property.

Utility model registration No. 3028700 was filed by the present applicant, and the required nonwoven fabric was needle punched with a locking needle with a base cloth interposed in a card wrap, and fuzz with long fluff was formed on the back of the punch. put out. Next, the non-slip effect of the non-woven fabric is obtained with the lump of fluff by partially melting the fluff on the back surface of the punch with a direct flame. Japanese Patent Application Laid-Open No. 2002-4163 is filed by the present applicants. After a fiber web is entangled with a regular needle, the fiber is projected using a fork needle. Next, the shearing process which cut | disconnects only the fiber which protruded from the surface of the obtained needle punch nonwoven fabric is implemented, and it heat-processes by the direct flame by a gas hair-baking machine so that the resin lump may be formed in the front-end | tip of the fiber subjected to the shearing process. Japanese Patent Laid-Open No. 2008-2009 discloses that a needle-punched nonwoven fabric is subjected to a needle punching process from above and below, and the obtained needle punched nonwoven fabric is formed with protruding loop raised portions in a hook shape, lattice shape or zigzag shape by a cord machine. To do. Next, the protruding tips of the raised fibers are melted, and the melted lump is excellent in the design and anti-slip properties of the nonwoven fabric surface.
Utility Model Registration No. 3028700 JP 2002-4163 A Japanese Patent Laid-Open No. 2008-2009

  As for the non-slip mat, it is not preferable to attach a PVC or rubber sheet processed into a spike shape to the back surface of the mat because the mat weight becomes too large. In the utility model registration No. 3028700, the thickness of the nonwoven fabric itself is increased even if the number of fluffs on the back surface of the punch increases by applying a needle punch with a large needle depth in order to obtain fluff with long fuzz on the back surface of the punch. Will be thinner than before. As a result, even if the obtained non-woven fabric is used by adhering to the back surface of another carpet material, there is little improvement in sound absorption and the like, and the improvement in cushioning is also small.

  In addition, since JP 2002-4163 entangles with a regular needle and then causes the fiber to protrude using a fork needle, two needle punching processes are required and a shearing process must also be performed. For this reason, the manufacturing process of the nonwoven fabric is increased and the cost is increased, and the thickness of the nonwoven fabric itself is insufficient, and even if the nonwoven fabric is used by adhering to the back surface of another carpet material, Small improvement in cushioning properties. Japanese Patent Application Laid-Open No. 2008-2009 requires a patterning operation, which increases the number of work steps and increases the cost as compared with a general punch carpet. In this needle punched nonwoven fabric, the loop raised portions are formed so as to protrude in a hook shape, a lattice shape, or a zigzag shape.

  The present invention has been proposed in order to improve the above-mentioned problems associated with conventional anti-slip mats, and is a non-slip mat back material that is relatively bulky, has high cushioning properties, and is excellent in sound absorption. The purpose is to provide the law. Another object of the present invention is to provide a non-slip mat back material and a method for producing the same which are less likely to slip on the carpet surface when laid on a carpet such as inside an automobile.

  The non-slip mat back material according to the present invention has at least one kind of large-diameter fiber having a fineness of 30 dtex or more and 10 to 40%, and at least one kind of small-diameter fiber having a fineness of 15 dtex or less and 40 to 90%. It is a needle punch felt composed of In the mat back surface material of the present invention, the fine fiber is closely entangled and unevenly distributed on the opposite side of the punch surface, and the mat surface is soft and bulky, while the large diameter fiber has little entanglement and the punch surface side. Then, the punch surface side is subjected to a hair baking treatment to form a large lump of large-diameter fibers on the bottom surface of the mat.

  In the non-slip mat back surface material of the present invention, the large diameter fiber and the small diameter fiber are preferably polyester fiber, polypropylene fiber, nylon fiber and / or acrylic fiber.

  In the method for producing a non-slip mat back material according to the present invention, 10 to 40% of large-diameter fibers having a fineness of 30 decitex or more and 40 to 90% of fine-diameter fibers having a fineness of 15 or less decitex are uniformly mixed. Then, wraps are formed by carding and stacked to a predetermined thickness. Using a fine count needle, the needle depth is shallow and the needle density is high, so that the needle kick barb mainly takes in the fine fibers and intertwins them tightly. A thick lump is formed on the punch surface, which is the bottom surface of the mat, by thickly unevenly locating on the opposite side, leaving the large diameter fibers mainly on the punch surface side, and then subjecting the punch surface side to a bake treatment. To do.

In the method for producing a mat back surface material of the present invention, the card wrap may further contain 1 to 20% of a heat-melting fiber having a low melting point. The fine count needle preferably has a count of # 35-50. Further, by using a fine count of the needle, when the needle punch needle depth 3~10mm and needle density 70-200 present / cm ² preferably.

In the method for manufacturing the mat back surface material, before performing needle punching using a fine count needle, preliminary needle punching may be performed from the same side or the opposite side of the punch surface with a needle density lower than that of the punch surface. The preliminary needle punch preferably has a needle depth of 5 to 15 mm and a needle density of 30 to 120 needles / cm ² .

  The present invention will be described with reference to the drawings. The anti-slip mat back surface material 18 (FIG. 5) of the present invention is manufactured by subjecting the card wrap 1 to needle punching and then performing a roasting treatment as shown in FIG. To do. The card wrap 1 contains 10 to 40% of at least one large-diameter fiber 2 having a fineness of 30 dtex or more and 40 to 90% of at least one small-diameter fiber 3 having a fineness of 15 dtex or less. is required.

  At this time, if the large-diameter fibers 2 having a fineness of 30 dtex or more do not exist in an amount of 10 to 40% of the total amount, the lump 16 (FIG. 5) cannot be formed almost uniformly on the bottom surface of the mat, and the mat back material 18 The anti-slip effect is reduced. On the other hand, if the fine fiber 3 having a fineness of 15 dtex or less does not exist in an amount of 40 to 90%, the mat back material 18 cannot be made flexible and bulky. The card wrap 1 requires stacking a plurality of wraps so as to have a predetermined thickness.

  The large-diameter fiber 2 and the small-diameter fiber 3 are made of at least one kind of raw material fiber that is the same or different, and examples of the raw material fiber include polyester fiber, polypropylene fiber, nylon fiber, and / or acrylic fiber. Reactive wool (collected recycled cotton) can also be used as the raw fiber. In addition to the raw material fibers, some natural fibers such as wool and cotton, and chemical fibers such as rayon fibers and acetate fibers may be included. From the standpoint of durability and cost, polyester fibers containing anti-hairs are preferred.

  If desired, the card wrap 1 may further contain 1 to 20% of a heat-fusible fiber having a low melting point, and the fiber is fused at the time of heat treatment or hair-burning treatment to prevent hair loss and the fabric. The felt material 10 may be set so as to tighten. As a typical example, the card wrap 1 is composed of 2% of low-melting polyester fiber of 4.4 dtex, 30% of polyester fiber of 44 dtex, and 68% of polyester fiber of 3.3 dtex, It is desirable to give an extreme difference in fineness between the small-diameter fibers 3.

  The card wrap 1 is formed by stacking a plurality of wraps so as to have a predetermined thickness, and then, as shown in FIG. 2, needle punching is performed by using a fine count locking needle 5. A large number of needles 5 are attached to a known needle machine, and it is necessary to reduce the needle depth and increase the needle density. The locking needle 5 has, for example, a triangular cross section and nine kick barbs (reverse barbs), and the fine count needle 5 has a smaller kick barb (not shown), so the fine fiber 3 is given priority over the thick fiber 2. Take it into the kick barb and entangle it.

If desired, a preliminary needle punch 8 with a needle 7 can be performed as shown in FIG. The punch surface of the preliminary needle punch 8 is not particularly limited, and if it is performed from the same side as the punch surface of the needle punch 6 by the needle 5, the large-diameter fiber 2 is arranged on one side to increase the anti-slip effect, and the opposite side. This will improve the tightness of the felt fabric. In the preliminary needle punch 8, it is preferable that the needle depth is 5 to 15 mm and the needle density is 30 to 120 needles / cm ² . Compared to the substantial needle punch 6 by the needle 5, the preliminary needle punch 8 has a slightly smaller needle count, a slightly deeper needle depth, and a lower needle density, so that the felting of the entire wrap progresses somewhat in advance. At this time, the large-diameter fiber 2 in the wrap is hardly entangled with the needle 7 and hardly moves, and the small-diameter fiber 3 is slightly fed to the upper part 10b or the lower part 10a of the wrap.

The substantial needle punch shown in FIG. 2 is desirably performed with a needle 5 having a count of 35 to 50 and a needle depth of 3 to 10 mm and a needle density of 70 to 200 / cm ² . When the needle depth is reduced and the needle density is increased, the fine fiber 3 taken into the kick barb of the needle 5 is sent to the lower wrap 10a at the same time as the entanglement to ensure the felt thickness. The small-diameter fibers 3 can be intertwined with each other and felt. On the other hand, in this needle punch, the large-diameter fiber 2 has little entanglement with the needle 5 and remains unevenly above the wrap 10b, so that a hard and dense small lump 16 (FIG. 5) is formed on the felt surface 12. It becomes easy.

  The thickness of the obtained felt material 10 (FIG. 4) is mainly secured by the entangled small diameter fiber 3, and the large diameter fiber 2 with little entanglement with the needle 5 remains on the felt surface 12 side. When the felt material 10 contains a low melting point polyester fiber, the felt material 10 is heat treated at 150 to 200 ° C. for 1 to 3 minutes, so that the low melting point polyester fiber is fused and tightens the fabric to prevent hair loss. Can be set as Further, this heat treatment can be omitted, and the low melting point polyester fiber can be fused by the subsequent hair baking treatment.

  The surface 12 of the felt material 10 (FIG. 4) may be heated at 500 to 1200 ° C. for a short time to partially melt the large diameter fiber 2 in order to enhance the anti-slip effect. As the heating means, a direct flame or a far-infrared heater using a gas hair roaster 14 is used. This partial melting does not need to be uniform including the shrinkage of the fibers on the felt surface 12, but at least a part of the large-diameter fiber 2 is agglomerated to form a small mass 16 (FIG. 5) almost uniformly. However, it is necessary to increase the anti-slip effect of the mat back surface material 18.

  The non-slip mat back surface material 18 is usually bonded to the surface material 19 (FIG. 7) and then cut into an appropriate size. As illustrated in FIG. Can be laid on top. At this time, since the mat bottom surface is roughened, it is possible to avoid the mat 20 from moving or shifting due to the stepping pressure on the floor carpet 22. Further, the non-slip mat back surface material 18 can be used as it is as a non-slip mat, or it can be used as a back material for rug carpets and electric carpets that are often laid on ordinary carpets.

  The surface material 19 to be used is preferably a material having a design property and a good touch. Examples of the surface material 19 include pile materials such as needle punch carpets, warp knitted piles, tufted carpets and Wilton carpets, fiber mats, synthetic resin sheets, and cushion floor sheets.

  The non-slip mat back surface material 18 is relatively thick and has cushioning properties, and is also rich in sound absorption. Further, the mat surface has a lot of small diameter fibers 3 and good touch feeling, and the mat surface can be used alone. Since the back material 18 itself is relatively flexible and easy to bend, it can be easily fitted to the floor carpet 22 and the occurrence of wrinkles at the corners can be avoided. Moreover, when the automobile 21 is discarded and incinerated, almost no toxic gas such as chlorine gas which becomes a pollution source is generated from the mat back surface material 18.

  The non-slip mat back surface material according to the present invention is such that the fine fibers are closely entangled in the needle punch felt and unevenly distributed on the opposite side of the punch surface, the mat surface is soft and bulky, and can be used as a single mat. Is possible. The anti-slip mat obtained in the present invention is relatively bulky and has small-diameter fibers unevenly distributed on the surface of the mat. Therefore, the anti-slip mat has good sound-absorbing properties for automobiles, good tactile sensation, and excellent cushioning properties. Since this non-slip mat is a needle punch felt, it can be washed, and when it becomes dirty, it can be taken out of the automobile and washed with water, and no pollution occurs during disposal.

  In the non-slip mat back surface material of the present invention, the large-diameter fibers are less entangled and remain on the punch surface side, and when this punch surface side is subjected to a hair baking treatment, a small mass of large-diameter fibers can be formed on the bottom surface of the mat. In the mat back surface material of the present invention, the large-diameter fibers are gathered on the bottom surface of the mat, and are relatively hard and hardly deformed. Therefore, the anti-slip effect of the anti-slip mat is superior to the conventional equivalent. When the non-slip mat obtained in the present invention is laid on the floor carpet of an automobile, the mat does not move or shift due to the stepping pressure on the floor carpet due to the rough surface of the hard large-diameter fiber on the back side of the mat. In this case, it is safe even if the floor carpet surface is wet.

  In the method for producing a mat back surface material according to the present invention, the fine diameter fibers and the large diameter fibers are unevenly distributed in the vertical direction at the same time as the needle punching process, and no special treatment is required for the uneven distribution. The number of steps is substantially the same as that for felt production. Compared with the existing non-slip nonwoven fabric manufacturing method, the manufacturing method of the back material of the present invention does not require a deep needle punch, or does not require a shearing process or a partial raising process. The production cost is considerably low as a whole.

  Next, the present invention will be described based on examples, but the present invention is not limited to the examples. In this embodiment, the needle punching process is performed twice as shown in FIG. 6, but actually the needle punching process is required only once.

  In order to obtain the card wrap 1 shown in FIG. 1, the large diameter fiber 2 and the small diameter fiber 3 are mixed. Actually, white regular polyester fiber (thick fiber 2) with a fineness of 37 dtex 20% by weight, black regular polyester fiber with a fineness of 3.3 dtex (fine fiber 3) 38% by weight, black regular with a fineness of 6.6 dtex Polyester fiber (thin fiber 3) 40% by weight, fine fiber 4.4 decitex low-melting polyester fiber 2% by weight is uniformly mixed, then carded, and multiple wraps are stacked to form a long card wrap 1 Obtained.

  As shown in FIG. 2, the card wrap 1 was subjected to needle punching using a locking needle 5 with a fine count. Actually, as shown in FIG. 6, the long card wrap 1 was fed into the needle machine, the preliminary needle punch 8 by the needle 7 was performed from below, and the substantial needle punch 6 by the needle 5 was performed from above.

In FIG. 6, the preliminary needle punch 8 from below is 8 mm in needle depth and 60 needles / cm ² using a needle 7 of needle count # 36. The preliminary needle punch 8 has a slightly smaller needle count, a slightly deeper needle depth, and a lower needle density than the needle punch 6, so that the felting of the entire lap has progressed somewhat in advance. At this time, the large-diameter fibers 2 are hardly entangled, and the small-diameter fibers 3 are only sent to the upper part 10b of the wrap.

In the next substantial needle punch 6, the needle depth of the needle 5 was # 5 mm and the needle density was 111 needles / cm ² . When the needle depth is reduced and the needle density is increased with a fine count rocking needle 5, the needle has a small kick barb. Therefore, the fine fiber 3 is preferentially taken into the kick barb over the thick fiber 2 and the upper 10b of the lap is formed. Is actively fed from the lower part 10a to the lower part 10a of the wrap, and the small-diameter fibers 3 are mainly entangled and felted in the lower part 10a. On the other hand, in this needle punch 6, the large-diameter fiber 2 has little entanglement with the needle 5 and tends to remain in the upper portion 10b of the wrap.

By this needle punching process, a felt material 10 (FIG. 3) having a thickness of 4.8 mm, a basis weight of 600 g / m ² and a density of 124 kg / m ³ was obtained. The thickness of the felt material 10 is mainly secured by the thin fiber 3, and the thick fiber 2 with little entanglement with the needle 5 remains on the felt surface 12 side. The felt material 10 was heat-treated at 150 ° C. for 3 minutes to fuse the low-melting polyester fiber, and the felt material was set so as to give the fabric tightness.

  Next, as shown in FIG. 4, on the surface 12 of the felt material 10, the large-diameter fibers 2 on the surface were partially melted by a direct flame by a gas hair roasting machine 14. Due to this partial melting, as shown in FIG. 5, a part of the large-diameter fiber 2 on the felt surface 12 is agglomerated, and a small mass 16 of the large-diameter fiber 2 is formed on the entire mat bottom surface. Increases the anti-slip effect.

  The obtained non-slip mat back surface material 18 is bonded to a design surface material 19 (FIG. 7), and then cut to an appropriate size, and then the surroundings are overlocked with a sewing machine to produce a non-slip mat 20. did. When the mat back material 18 is laid on the floor carpet 22 of an appropriate automobile 21 (FIG. 8), the mat bottom surface is roughened, so that it does not move or deviate on the floor carpet 22 due to treading pressure. Further, the non-slip mat 20 generates almost no toxic gas even if it is incinerated at the time of disposal.

Comparative Example 1
In order to manufacture a non-slip mat, a card wrap made of 100% by weight of polyester fiber having a fineness of 15 dtex is used. The entire wrap was needle punched with a normal rocking needle to obtain a felt having a thickness of 3 mm. Next, the pile was raised by punching with a fork needle at a needle density of 60 / cm ² .

Next, an adhesive is applied to the entire back surface of the 3 mm thick napped felt material, and a 1.5 mm thick polyvinyl chloride sheet processed into a spike shape is bonded. The obtained non-slip mat had a basis weight of 1920 g / m ² .

Comparative Example 2
In order to manufacture a non-slip mat, a card wrap made of 100% by weight of polyester fibers having a fineness of 17 dtex is used. The entire wrap is needle punched deeply with a normal rocking needle at a needle density of 50 / cm ² , and fluff with long fluff is produced on the back of the punch. Next, the fluff on the back surface of the punch was partially melted with a direct flame to obtain a mat having fluffed fluff. The obtained mat had a thickness of 2.1 mm, a basis weight of 280 g / m ² , and a density of 133 kg / m ³ .

Comparative Example 3
In order to produce a non-slip mat with an emphasis on thickness, a card wrap made of 100% by weight polyester fiber having a fineness of 17 dtex is used. The entire wrap is needle punched deeply with a normal rocking needle at a needle density of 30 / cm ² , and fluff with long fluff is produced on the back of the punch. Next, the fluff on the back surface of the punch was partially melted with a direct flame to obtain a mat having fluffed fluff. The obtained mat had a thickness of 2.8 mm, a basis weight of 420 g / m ² , and a density of 150 kg / m ³ .

Comparative Example 4
In order to produce a non-slip mat having a high basis weight, a relatively thick card wrap made of 100% by weight of polyester fiber having a fineness of 17 dtex is used. The entire wrap is needle punched deeply with a normal rocking needle at a needle density of 80 / cm ² , and fluff with long fluff is produced on the back of the punch. Next, the fluff on the back surface of the punch was partially melted with a direct flame to obtain a mat having fluffed fluff. The obtained mat had a thickness of 4.5 mm, a weight per unit area of 800 g / m ² and a density of 178 kg / m ³ .

  In order to test the anti-slip performance of the mats of Examples and Comparative Examples 2 to 4, samples cut to 100 × 150 mm were prepared. There are three types of floor carpets to be tested: general plane, velor, and diroir.

  Test method: Each sample is gently placed on the floor carpet, and a weight of 1 kg and a surface area of 100 × 100 mm is placed thereon. Hook the push full gauge into the sample hole and read the peak value by pulling it horizontally. This pulling operation is repeated three times, and the average value is evaluated. The results are shown in Table 1 below.

  In addition, the sound absorption performance of the mats of Examples and Comparative Examples 2 to 4 are compared and are shown in Table 1 together. The sound absorption performance was measured according to JIS A11405-1 using a system using a 4206 type impedance measuring tube (Spectris), and data of 500, 1000, 2000 and 5000 Hz were compared.

  As shown in Table 1, the mat of Comparative Example 1 has the same thickness as the anti-slip mat of Example 1 and the weight is 3 times or more, and the handling property is remarkably deteriorated. Further, when the non-slip mat of the example is compared with the mats of the comparative examples 2 and 3, it is equivalent to the velor-like floor carpet which is a special use, but other than that, the non-slip mat of the example is The anti-slip effect was more excellent. The sound absorption performance was equivalent or better.

  Further, when the anti-slip mat of the example is compared with the mat of the comparative example 4, even if the thickness and anti-slip performance are almost the same, the anti-slip mat of the example is more lightweight and has a bulky fiber structure. Therefore, the sound absorption performance is more excellent.

It is a schematic side view which shows the card wrap used by this invention. It is a schematic side view which shows the state which needle-punches a card wrap. It is a schematic side view which shows the felt raw material which carried out the needle punch process. It is a schematic side view which shows the state which heat-treats a felt raw material. It is a schematic side view which shows the non-slip mat | matte back surface material which concerns on this invention. It is a schematic explanatory drawing which shows a specific example of the needle punch process of a card wrap. It is a schematic sectional drawing which shows an example of a non-slip | skid mat. It is a schematic sectional drawing which shows the usage example of a non-slip | skid mat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Card wrap 2 Large diameter fiber 3 Small diameter fiber 5 Locking needle 6 Needle punch 8 Preliminary needle punch 10 Felt material 14 Gas hair roasting machine 18 Non-slip mat back material 20 Non-slip mat

Claims (8)

  A needle punch felt composed of at least one kind of large diameter fiber having a fineness of 30 dtex or more and 10 to 40% and at least one kind of small diameter fiber having a fineness of 15 dtex or less and 40 to 90%. The diameter fibers are closely entangled and unevenly distributed on the opposite side of the punch surface, and the mat surface is soft and bulky. On the other hand, the large diameter fibers have little entanglement and remain mainly on the punch surface side. A non-slip mat back material in which a small lump of large-diameter fibers is formed on the bottom surface of the mat by subjecting the side to a roasting treatment.   The non-slip mat back surface material according to claim 1, wherein the large diameter fiber and the small diameter fiber are polyester fiber, polypropylene fiber, nylon fiber and / or acrylic fiber.   Uniform blending of 10 to 40% large fiber with a fineness of 30 dtex or more and 40 to 90% fine fiber with a fineness of 15 dtex or less to form a card wrap by carding to a predetermined thickness Stacking, using a fine count needle, the needle depth is shallow and the needle density is high, so that the needle kick barb mainly takes in the fine fibers and intertwines them tightly, punching the fine fibers The thick fibers are unevenly distributed on the opposite side of the surface, the large diameter fibers are mainly left on the punch surface side, and then the punch surface side is subjected to a hair baking treatment, whereby a small lump of large diameter fibers is formed on the punch surface which is the mat bottom surface. A method for producing a non-slip mat back material.   The manufacturing method according to claim 3, wherein the card wrap further contains 1 to 20% of a heat-melting fiber having a low melting point.   4. The method according to claim 3, wherein the fine count needle has a count of # 35-50. Using fine count needle process according to claim 3 or 5 wherein the needle punch needle depth 3~10mm and needle density 70-200 present / cm ^2.   4. The method according to claim 3, wherein the preliminary needle punch is performed from the same side or the opposite side of the punch surface at a needle density lower than that of the punch surface before needle punching using the fine count needle. Preliminary needle-punching process for the preparation of claim 3 or 7, wherein the 5~15mm and needle density needle depth 30-120 present / cm ^2.

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