JP2006265782A - Engaging filament nonwoven fabric - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engaging filament nonwoven fabric on whose surface the fibers are not fuzzed, when released from a hook-like engaging member, whose fibers are not blocked in the hooks and not continuously peeled off, and which has loops not deteriorating their engaging forces, even when repeatedly engaged with the hook-like engaging member. <P>SOLUTION: This engaging filament nonwoven fabric whose front and back sides are integrated with discontinuous partial hot-pressed portions scattered on the surface is characterized by disposing the substantially continuous waved hot-pressed portions in parallel so as to cross the preferential fiber arrangement direction of the surface layer at a constant distance and divide the direction of the hot-pressed lines, thereby dividing the fiber-fixed ranges of non-hot pressed portions and forming loops whose both ends are fixed to the non-hot pressed portions. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a long-fiber nonwoven fabric for locking, and more particularly to a long-fiber nonwoven fabric for locking that has a loop that can be repeatedly coupled to a hook-shaped locking member and is used for a hook-and-loop fastener and has few fluffs. It is.

  In the conventional hook-and-loop fastener, the woven and knitted fabric formed with a loop made of natural fibers or synthetic fibers and the hook-shaped locking member are fixed in advance to the two surfaces to be joined by bonding or sewing in advance, There is known a method of detachably coupling a hook by hooking it on a loop. For example, there are cases where a woven or knitted fabric in which a loop such as a tricot fabric is formed and a hook-shaped locking member are combined for fixing a seat cover of a seat in a vehicle, an airplane, or the like, or fastening a disposable diaper.

  However, in a loop such as a tricot fabric used for these applications, fraying or the like occurs when cut, which may cause trouble in the manufacturing process. Moreover, there are methods for preventing the fraying, and a method of attaching a backing material to cope with the dragging. However, these methods are expensive.

  If a non-woven fabric of crimped long fibers is used as in Patent Document 1, the above-mentioned fraying and cost problems are solved. However, when such a general nonwoven fabric is repeatedly bonded by reapplying or the like, the fibers of the nonwoven fabric are peeled off by the hooks, and the surface of the nonwoven fabric is fluffed. The fuzzy fibers cover the surface to hide other loop yarns, and the stripped fibers are stuck in the hooks. For this reason, when it couple | bonds repeatedly, there existed a problem which the fiber with the state with which the fuzzy fiber and the hook were jammed inhibits a coupling | bonding, and that the joint strength is reduced.

Patent Document 2 has a proposal of embossing parallel lines on a nonwoven fabric, but there is a problem that the balance between the vertical and horizontal directions of the thermocompression bonding portion is not good, so the dimensional stability of the nonwoven fabric is poor, and it is easily deformed during use.
As in Patent Document 3, a nonwoven fabric having a matrix-like thermocompression bonding portion has good dimensional stability, but has a problem that the texture of the nonwoven fabric becomes hard due to the continuous thermocompression bonding portion.

As these improvements, Patent Document 4 discloses a non-woven fabric for a locking material having continuous parallel linear pressure-bonding portions so as to cross the fiber dominant arrangement direction of the surface layer. However, although excellent in terms of fixing the locked fiber, even if it is said to be an arrangement in a certain direction, the arrangement of the non-woven fibers is not necessarily constant, has a variation in directionality, and fuzzes in the engagement range depending on the degree, Further, there is a tendency that fluff having a fiber length longer than the interval between the parallel lines is generated, which is not sufficient.
JP-A-2-193607 JP 11-335960 A Japanese Patent Laid-Open No. 11-75912 JP 2003-9912 A

  An object of the present invention is to solve the above-mentioned drawbacks and to have a loop that does not easily reduce the bonding strength even when repeatedly coupled to a hook-shaped locking member, has a small fluffing range during use, and a fluff length Is to provide a short-length non-woven fabric for locking.

  In order to solve the above-mentioned problems, the present inventor has examined in detail how the surface fastener is used in the nonwoven material, and investigated the direction of the bonding strength of the surface fastener. It has been found that it is preferable that the parallel linear crimping portion that is necessary in the direction and crosses over at least the fiber arrangement dominant direction of the nonwoven fabric surface layer. However, there are problems such as fluffing in the locking range depending on the direction and degree of the locking material, and fluffing longer than the interval between the parallel lines fixed by crimping. The arrangement direction has a variation range of directionality of at least about ± 30 ° with respect to the dominant direction, and although it is practically excellent in the fiber arrangement effect in terms of fixing the fibers, some of the arrangement directions are in the direction of the parallel lines. It was found that the fibers arranged in were cut off from the fixed point and fluffed.

The present inventors also reviewed the hook shape. Recently, the shape of the hook has been improved. For example, the hook has a shallow and small hook and has a high density arrangement, and the surface of the hook is smooth and dense so that there is almost no unevenness. . For example, some hooks have a height of about 0.2 mm and an arrangement density of about 250 pieces / cm ² is increased. Many have changed to the locking method of locking. For this reason, it has been found that as a locking material suitable for recent hooks, a material having a higher probability of locking non-woven fibers to the hook is required.

  As a result of studying these points in consideration of the above points, the present inventors have crossed the fiber-dominated arrangement direction of the nonwoven fabric surface layer at a constant interval, and the line direction of the crimping line can be divided with a certain angle. In addition, a substantially continuous wavy crimping part is provided in parallel, and preferably, in the wavy crimping part, the distance between adjacent wavy lines provided in parallel is smaller than the wave height to fix the fibers. Thus, the inventors have found that delimiting the fixed range of the fibers in the non-crimped portion is effective for fiber breakage and fluffing, and reached the present invention.

That is, the invention claimed in the present application is as follows.
(1) A thermoplastic long-fiber web having a dominant direction in the fiber arrangement of the nonwoven fabric surface layer, and the substantially continuous wavy line crimping portions parallel to each other so as to cross the dominant direction of the fiber arrangement of the surface layer A long-fiber nonwoven fabric for locking, which is provided.
(2) The long-fiber non-woven fabric for locking according to (1), wherein an interval between adjacent wavy lines provided in parallel is smaller than a wave height.

(3) The long fibers for locking according to (1) or (2), wherein the aspect ratio of the nonwoven fabric strength is 2.0 to 8.0, and the fiber arrangement in the longitudinal direction is dominant Non-woven fabric.
(4) The locking long fiber nonwoven fabric according to any one of (1) to (3), wherein the ratio of the pitch and wave height of the wavy crimp portion is in the range of 1.0 to 4.0.

(5) The width of the non-crimped part between wavy crimping parts is 2-5 mm, The long fiber nonwoven fabric for latching in any one of (1)-(4) characterized by the above-mentioned.
(6) The locking long fiber nonwoven fabric according to any one of (1) to (5), wherein the width of the wavy crimping portion is 0.3 to 1.5 mm.

(7) For locking according to any one of (1) to (6), in which the discontinuous partial thermocompression bonding parts are scattered across the entire surface of the nonwoven fabric and integrated with the front and back surfaces in a pattern different from the wavy crimping part. Long fiber nonwoven fabric.
(8) The long fiber nonwoven fabric for locking according to any one of (1) to (7), wherein the fibers constituting the nonwoven fabric are crimped fibers.

  In the present invention, the shape of the wavy crimp portion may be a combination of different pitches and wave heights for each line, but basically the same wave shape is preferably repeated, as shown in FIG. Shapes such as a V shape with a sharp wave apex (1), a round U shape (2), and a planar trapezoidal shape (3) are effective.

  Furthermore, the ratio (p / h) of the wavy pitch (p) to the wave height (h) related to the fixed section of the fiber in the non-crimped portion is preferably in the range of 1.0 to 4.0, and 1.1 to 3. A range of .5 is more preferred. If the ratio exceeds 4.0, the effect is weak, similar to a mere parallel line, and if it is less than 1.0, the wavy line becomes too dense, the locking effect becomes weak and the softness is lowered. The angle (a) between the wavy line and the horizontal line is preferably 30 to 60 °.

  In the present invention, the fiber arrangement dominant direction is a direction in which there are many fiber arrangements on the surface of the nonwoven fabric, and the index indicating the fiber arrangement direction appears almost in the strong aspect ratio of the nonwoven fabric. This aspect ratio is preferably in the range of 2.0 to 8.0, and more preferably in the range of 2.5 to 6.0. If the aspect ratio of the strength is less than 2.0, the directionality of the fibers forming the loop is disordered and arranged, so that the hook to the hook effective in binding strength is reduced, and each fiber in the loop Since the fixing lengths are different, when the hook is peeled off, it is easy to break from the short single yarn, and the bonding strength with the hook-shaped locking member is reduced. When the aspect ratio of the strength exceeds 8.0, the lateral strength of the nonwoven fabric itself becomes too low, and the nonwoven fabric may be torn and broken when peeled from the hook-shaped locking member.

  For practical use of non-woven fabric for locking, when the tape is slit into a cut surface, the occurrence of fraying becomes a problem, or to maintain the strength and dimensional stability of the non-woven fabric, forming a loop for locking Apart from an effective wavy thermocompression bonding part, it is preferable to combine a partial thermocompression bonding part for preventing the loop formation and maintaining the dimensional stability of the nonwoven fabric. The partial thermocompression bonding part for preventing the loop formation and maintaining the dimensional stability is a point-like shape such as a circle or a corner scattered in the periphery of the wavy crimping part. Is a partial thermocompression bonding part of a different pattern, and there may be a part which overlaps with a wavy thermocompression bonding part. The area ratio of this partial thermocompression bonding part is preferably 3 to 50%, more preferably 5 to 30%.

  In the present invention, the width of the non-compression bonding portion corresponding to the interval between the wavy lines is set in consideration of the pitch and wave height of the wavy thermocompression bonding portion, but is preferably 2 to 5 mm. In addition, the space | interval of the wavy line said here (width | variety (c) of the non-crimp part of FIG. 1) is shown by the space | interval of the orientation direction of a fiber. Moreover, it is useful from the point of fiber fixation that the width | variety of the substantially continuous wavy line-shaped crimping | compression-bonding part is 0.3-1.5 mm. The substantially continuous wavy line may be a broken line or a broken line, but is preferably a continuous wavy line as a whole, and more preferably a completely continuous wavy line.

  In the present invention, the fiber to be used is preferably a thermoplastic fiber, particularly a crystalline thermoplastic fiber in terms of formation of a pressure-bonding part, strength, etc., for example, a polyolefin such as a polypropylene fiber that is lightweight and has a relatively low melting point and is easily crimped. Polyester fibers such as polyethylene terephthalate fibers having good single fiber strength and dimensional stability, and polyamide fibers such as nylon 6 and nylon 66 having good single yarn strength and fabric flexibility are used alone or in combination. be able to. Moreover, although these fibers may be used as composite fibers, fibers composed of a single component are more preferable from the viewpoint of cost and recyclability.

  In addition, the nonwoven fabric of the present invention is advantageous in terms of strength in terms of tension applied to a single yarn at the time of peeling from the hook-shaped locking member, and the fact that the thread does not easily come off. Consists of the web.

  In the present invention, the fineness of the single fiber constituting the nonwoven fabric is preferably 1.0 to 11.0 dtex in terms of flexibility and locking effect, and more preferably 2.0 to 9.0 dtex. When the single fiber fineness is less than 1.0 dtex, the touch is flexible, but the single yarn is easily broken and the bonding strength with the hook-shaped locking member is lowered. On the other hand, if the single fiber fineness exceeds 11.0 dtex, the single yarn is difficult to break, but the texture of the resulting nonwoven fabric becomes hard and the flexibility as a locking material is impaired.

  Use of crimped fibers as the fiber of the present invention is more preferable because the resulting nonwoven fabric becomes bulky and adaptability to various hook shapes of the hook-shaped locking member is improved. The crimped fiber is preferably formed as a continuous filament having a helical crimp. The number of crimps is preferably 2 or more / 25 mm, more preferably more. The crimped spiral diameter is preferably 0.3 to 2.0 mm, and more preferably 0.3 to 1.0 mm. If the crimped spiral diameter exceeds 2.0 mm, the number of crimps per unit length will be small, so the bulkiness will be poor, and if it is less than 0.3 mm, the space obtained by the spiral shape will be too small. In addition, the bulkiness is inferior, and the effect of crimped fibers cannot be exhibited.

  Further, the fiber of the present invention may be formed into a special shape by deforming the yarn cross section other than a normal round shape. In the case of a crimped fiber with a single component, a special shape can be used as one method from the viewpoint of crimp expression. In this case, what is necessary is just the shape which has a convex part or a recessed part of at least one part of thread | yarn cross-sectional shape. In addition, a crimped yarn with a single component may be physically formed by an asymmetric cooling method or the like that cools the yarn non-uniformly at the time of fiber production. Can be formed into a crimped fiber.

The non-woven fabric of the present invention is joined by partial thermocompression bonding, but the substantially continuous wavy crimping portion described above is stripped for a long time when the coupled hook-shaped locking members are peeled off. If this effect is obtained, it is possible to divide the direction of the wavy line when it is provided in parallel. It means that the shape of the crimping part may be continuous. When flexibility is required depending on the application to be used and the attachment site, it is preferable to link the dotted or / and broken lines, and make them substantially linear, in order to interrupt the separation of the fibers. The distance between the crimping parts is preferably 0.3 mm or less, more preferably 0.1 mm or less. The width (thickness (d)) of the wavy crimp portion is preferably in the range of 0.3 to 1.5 mm, and more preferably in the range of 0.5 to 1.0 mm. If the width of the linear crimping portion is less than 0.3 mm, the crimping tends to be insufficient, and when the hook-shaped locking member is peeled off, the fluffy fibers are not cut off and are easily peeled off, leaving long fluffy fibers remaining. Covering the surface makes repeated bonding difficult. When the width of the linear pressure-bonding part exceeds 1.5 mm, the cloth is inferior in flexibility. In addition, the scattered non-continuous thermocompression bonding portions are generally in the form of dots such as circles and corners, and preferably have an area of the pressure bonding portions of 0.03 mm ^{2 to 5} mm ^{2 with} an interval of 0.5 mm. ˜4.0 mm is preferred.

  The wavy line crimping parts and the scattered non-continuous crimping parts are formed by thermocompression bonding of fibers, and as a forming method thereof, in addition to a method using an engraved roll, a method of pressing a flat plate is performed. However, a method using a roll is preferable in terms of production efficiency. There are a combination in which one is an engraving roll and the other is a smooth metal roll, and a method of attaching the upper and lower co-engraved rolls together. The degree of thermocompression bonding is determined by setting the temperature and contact pressure of the upper and lower rolls according to the required performance of the nonwoven fabric to be obtained, such as strength and fuzziness. It is preferable to set it below the melting point. You may form a wavy crimp part and the scattered discontinuous crimp part simultaneously or in two steps.

   The non-crimped part between the wavy thermocompression bonding parts in the present invention refers to a non-crimped part between the crimped part and the crimped part formed by wavy thermocompression bonding, and the fibers in the non-crimped part are joined together. Without forming a loop between the crimping parts. As illustrated in FIG. 1, the width (c) of the non-compression bonding portion indicates the interval between the wavy thermocompression bonding portions, and is preferably at least 2 to 5 mm in the fiber orientation direction. Considering the pitch and wave height of the wavy lines, the shortest interval between the crimping parts is 0.5 to 0.86 times this. When the width of the non-crimped portion is less than 2 mm, the loop in the non-crimped portion is small, and the hook-like locking member is less caught and the bond strength is reduced. When the width of the non-crimped portion exceeds 5 mm, the fibers cut when the hook-shaped locking member is peeled off become long, and the surface of the nonwoven fabric becomes fluffed and covers the non-crimped portion, so that repeated bonding is difficult.

Basis weight of the nonwoven fabric of the present invention can optionally be selected according to the intended purpose, lightness, convenience of handling that took into consideration the strength and the like are possible 10 to 150 g / ^{m 2,} practically ^20g / m 2 ^~60g / m ² is preferred.
In addition, the hook-shaped locking member used in the present invention is a general one in which hook-like or hook-like members capable of hooking fibers are arranged, and may be as illustrated in FIG.

  The nonwoven fabric of the present invention is provided with a substantially continuous wavy crimping part in parallel so as to cross the dominant direction of the fiber arrangement of the surface layer at regular intervals and to also divide the linear direction of the crimping line, It is possible to form a loop in which the fixing range of the fibers in the non-crimped part is divided and both ends are fixed in the non-crimped part. When the hook of the hook-shaped locking member is hooked on the loop, sufficient binding strength as a locking material is exhibited, and the crimping portion around the loop is peeled off when peeling from the hook-shaped locking member. By fusing the surface fluff due to the fibers, the fluff on the surface is reduced, and the cut fibers are less likely to clog the hooks and can be repeatedly bonded. Moreover, even when slitting into a tape shape, the cut surface is released and fraying is eliminated.

Next, the present invention will be described in more detail with reference to examples and comparative examples. In addition, the performance of the obtained nonwoven fabric was measured by the following method.
(1) Bonding strength A hook-shaped locking member having a width of 3 cm in which about 250 mushroom-shaped hooks having a height of about 0.25 mm are provided per cm ² , and the nonwoven fabric (width 3 cm) prepared in the examples and comparative examples. The direction crossing the dominant direction of the fiber array (machine width (transverse) direction) was used as the locking direction, and the load was bonded by a 700 g roller with a length of 3 cm. Using Tensilon manufactured by Shimadzu Corporation, grabbed the top and bottom of the unbonded part, performed a tensile test at a grip width of 100 mm and a test speed of 300 mm / min, read the maximum strength, and divided this by the area of the joint The value was defined as bond strength (N / cm ² ). Furthermore, it couple | bonded repeatedly and tested.

(2) Evaluation of fluff after binding The fluff after locking showed the degree of fluff sensuously in grade. Non-locked grade 5 and hot-pressed with a dotted crimping part (round 0.45φ, 1.5mm interval), but the fluffing state after 5 times locking is grade 1, and this intermediate level is slightly fluffy The average value of n = 5 is shown with the grade 4 as the grade, grade 2 as the fluffy grade, grade 3 as the fluffy but hookable grade that can be hooked. The practical level is set to 3 or higher.
(3) Tensile strength The strength of the nonwoven fabric was determined by conducting a tensile test on a test piece having a width of 3 cm and a length of 20 cm using Tensilon manufactured by Shimadzu Corporation at a grip width of 100 mm and a test speed of 300 mm / min. The strength of the nonwoven fabric is measured in the machine (longitudinal) direction, the 90 ° direction is the width (transverse) direction, and the strength is measured by dividing the longitudinal strength value by the transverse strength value. Ratio.

(4) Thickness The thickness of the non-woven fabric was measured with a peacock thickness measuring instrument at a load of 100 g / cm ² and represented by an average value of n = 5.
(5) Flexibility The flexibility was measured by a cantilever method described in JIS-L1906, and indicated by an average value of n = 5. The lower the value, the more flexible.

[Examples 1, 2 and 3]
Using polypropylene (MFR = 40 measured under the conditions in Table 1 of JIS-K7210) as a raw material, pulling long fibers melt-extruded from a nozzle with a round cross-section from the side near the spout, pulling air soccer etc. It was picked up by a take-up device. The yarn exiting the pulling and taking-up device was passed through a charging device, opened, and then collected as a web on a moving wire mesh conveyor. This web is conveyed, and a V-shaped wavy crimping portion (a = 45 °, p = 10 mm, h = 5 mm, d = 0.5 mm) as shown in FIG. 1 c = 4 mm (Example 1), 3 mm (Example 1) Example 2) and 2 mm (Example 3) are each encased between a heated roll and a smooth roll engraved at a press-bonding surface temperature of 138 ° C., and have non-crimped parts formed between wavy crimped parts. A nonwoven fabric was obtained. The constituent fiber of the nonwoven fabric was 2.8 dtex, and the basis weight was 40 g / m ² . Table 1 shows the results of the coupling performance with the hook-shaped locking member. The obtained non-woven fabric is more flexible as the distance (c) between the wavy lines becomes wider, and the fluff after locking tends to increase, but it can be said to be an acceptable level. Further, when the distance between the wavy lines was narrowed to c = 2 mm, the fluff was hard to fray and was somewhat stiff, but all had no problem in practical use and had sufficient bonding strength.

[Examples 4 and 5]
In Example 1, the same method was used except that the engraved pattern of the heating roll was joined to each V-shaped wavy crimping portion shown in Table 1 using a heating roll, and the constituent fiber of the nonwoven fabric was 2.8 dtex and the basis weight. A nonwoven fabric of 40 g / m ² was obtained. Table 1 shows the results of the coupling performance with the hook-shaped locking member. The obtained non-woven fabric has a small ratio (p / h) of wave pitch (p) to wave height (h) of 1.15 (Example 4), which has a little fluff after locking but is flexible. In the case where the ratio was as large as 3.47 (Example 5), the opposite tendency was observed, but none of them had any practical problems.

[Example 6]
In Example 1, the long fiber melt-extruded from the irregular V-shaped nozzle was cooled from the side in the vicinity of the spinning nozzle, and the yarn exiting the traction take-off device had a helical crimp. A web of actual crimped yarn having a number of crimps of about 10 to 15 pieces / 25 mm and a helical diameter of about 0.8 mm was obtained. The engraving pattern of the heating roll is U-shaped wavy crimping part (a = 45 °, p = 10 mm, h = 5 mm, c = 4 mm, d = 0.5 mm) in FIG. By using a simple method, a nonwoven fabric having a constituent fiber of 2.8 dtex and a basis weight of 40 g / m ² was obtained. Table 1 shows the results of the coupling performance with the hook-shaped locking member. The obtained non-woven fabric is slightly more fluffed after being locked than a normal yarn, but it is easy to lock, has a soft texture, and can withstand practical use.

[Examples 7 and 8]
In Example 1, polyethylene terephthalate is used as a raw material, and engraving patterns of heating rolls are respectively V-shaped wavy crimping portions (a = 45 °, p = 10 mm, h = 5 mm, c = 4 mm, d = 0.5 mm) (implementation) Example 7), U-shaped wavy crimping part (a = 30 °, p = 10.4 mm, h = 3 mm, c = 2 mm, d = 0.8 mm) (Example 8), except that the crimping surface temperature was 235 ° C. Obtained a non-woven fabric having a constituent fiber of 2.0 dtex and a basis weight of 40 g / m ^{2 in} the same manner. Table 1 shows the results of the coupling performance with the hook-shaped locking member. The resulting non-woven fabric is somewhat stiff but has a high bond strength and little form change upon locking.

[Example 9]
In Example 1, a non-woven fabric having a constituent fiber of 2.0 dtex and a basis weight of 40 g / m ² was obtained in the same manner except that nylon 6 was used as a raw material and the pressure contact surface temperature was 200 ° C. Table 1 shows the results of the coupling performance with the hook-shaped locking member. The obtained non-woven fabric is soft to the touch and has a sufficient bond strength.

[Examples 10 and 11]
In Example 1, the heated roll in which the collected webs were engraved with scattered dotted crimping parts (0.45 mm diameter, 1.5 mm spacing, staggered arrangement, crimping area ratio 7%) for joining fibers together , Partially bonded at a crimping surface temperature of 135 ° C., and then the heating roll of the wavy crimping part used in Example 7 (Example 10), the heating roll of the wavy crimping part used in Example 8 ( Through Example 11), each was crimped at a crimping surface temperature of 135 ° C. to obtain a nonwoven fabric for a locking material having a constituent fiber of 2.8 dtex and a basis weight of 40 g / m ² . The obtained non-woven fabric was slightly harder than Example 1, but was soft and had less fluff after locking.

[Comparative Example 1]
In Example 10, only wavy partial thermocompression bonding (0.45 mm diameter, 1.5 mm spacing, staggered arrangement, crimping area ratio 7%) for joining fibers is performed, and the wavy crimping part is not processed. A nonwoven fabric was formed. The non-crimped part was swollen but continuous on a flat surface.
Moreover, when this nonwoven fabric was combined with the hook-shaped locking member, the initial strength had a sufficient binding strength, but when it was attached or detached, the fibers on the nonwoven fabric surface were cut by the hook with one peeling, and the nonwoven fabric surface Fibers with long tops were fluffed, cut fibers were clogged with hooks, and after several times, sufficient bonding strength could not be obtained even after bonding, and the fibers could not withstand repeated use. Table 1 shows the results of the coupling performance with the hook-shaped locking member.

[Comparative Example 2]
In Example 1, the nonwoven fabric formed by giving a parallel linear crimp part instead of a wavy crimp part was obtained. When this non-woven fabric was bonded to the hook-shaped locking member, it had a sufficient bonding strength. Furthermore, the coupling | bonding of this nonwoven fabric for latching materials and a hook-shaped latching member was repeated. Even if the bonding is repeated several times, the strength slightly decreases, but the strength is almost the same, and it can be attached and detached.However, the fibers on the surface of the nonwoven fabric have a lot of fluffing and relatively long fibers are seen. It was a problem. Table 1 shows the results of the coupling performance with the hook-shaped locking member.

  As described above, when the nonwoven fabric obtained in the example was used as a loop locking material and bonded to a hook-shaped locking member, it had sufficient bonding strength. Furthermore, the coupling between the long fiber nonwoven fabric for locking and the hook-shaped locking member was repeated. When the loop yarn in the non-crimped part is tensioned by the hook at the time of peeling, the loop yarn that is fixed at both ends by the wavy crimping is cut in the non-crimped part. The fiber length was shorter than that fixed by crimping, there was little fuzz on the surface of the nonwoven fabric, and the loop was not hidden. Further, since the fibers that were cut off and dropped in the hook were rarely clogged, repeated binding was not inhibited. Even after being repeated 5 times, the same strength was maintained and it was removable. Furthermore, the cut surface of the nonwoven fabric was free from fiber opening and fraying.

The top view which shows an example of the wavy engraving pattern of the heating roll used for this invention. The figure which shows the microscope picture of the side surface of the hook member which latches this invention nonwoven fabric.

Claims (8)

  A thermoplastic long-fiber web having a dominant direction in the fiber arrangement of the nonwoven fabric surface layer, wherein substantially continuous wavy crimp portions are provided in parallel so as to cross the dominant direction of the fiber arrangement of the surface layer. A long-fiber nonwoven fabric for locking, characterized in that.   The long fiber nonwoven fabric for locking according to claim 1, wherein an interval between adjacent wavy lines provided in parallel is smaller than a wave height.   The long-fiber nonwoven fabric for locking according to claim 1 or 2, wherein the nonwoven fabric has a strong aspect ratio of 2.0 to 8.0, and has a superior fiber arrangement in the longitudinal direction.   The long-fiber non-woven fabric for locking according to any one of claims 1 to 3, wherein the ratio of the pitch and wave height of the wavy crimp portion is in the range of 1.0 to 4.0.   The long fiber nonwoven fabric for locking according to any one of claims 1 to 4, wherein the width of the non-crimped portion between the wavy crimping portions is 2 to 5 mm.   6. The long fiber nonwoven fabric for locking according to any one of claims 1 to 5, wherein the wavy crimped portion has a width of 0.3 to 1.5 mm.   The long-fiber non-woven fabric for locking according to any one of claims 1 to 6, wherein a discontinuous partial thermocompression bonding portion is scattered over the entire surface of the non-woven fabric and integrated with the front and back sides in a pattern different from the wavy crimping portion. The long fiber nonwoven fabric for locking according to any one of claims 1 to 7, wherein the fiber constituting the nonwoven fabric is a crimped fiber.

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