JP2003221772A - Nonwoven fabric for fastening use - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible nonwoven fabric for fastening use having loops repeatedly engageable on a hook-shaped fastening member for a hook-and-loop fastener. <P>SOLUTION: This nonwoven fabric for fastening use is such one that thermoplastic synthetic fibers constituting the web are joined via partial thermocompression spots uniformly distributed throughout the surface of the fabric; wherein (1) the thermocompression spots are discontinuously linear and mutually independent, (2) part of the discontinuously linear thermocompression spots are arranged in parallel so that the longer side direction thereof cross the predominant arrangement direction of the fibers constituting the web, and these spots and the remaining spots adjoiningly arranged in parallel lines in the predominant arrangement direction of the fibers are arranged &le;1 mm apart from each other substantially in the direction of the parallel lines. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-woven fabric for engagement having a loop which can be repeatedly connected to a hook-shaped engagement member for a surface fastener.

[0002]

2. Description of the Related Art Conventionally, a hook-and-loop fastener has a woven and knitted fabric in which a loop is formed of a thread made of natural fibers or synthetic fibers and a hook-shaped locking member, which are fixed to two surfaces to be joined by bonding or sewing in advance. A method is known in which hooks are hooked on loops so as to be detachably coupled. For example, for fixing a seat cover of a seat of a vehicle, an airplane or the like, or for fastening a disposable diaper, a loop fastener or the like for joining a loop-formed woven or knitted fabric such as a tricot and a hook-shaped locking member can be cited.

However, a woven or knitted fabric having loops such as tricots used for these purposes may have a problem such as fraying when it is cut, which may cause troubles in the manufacturing process. There is a problem that the loop side needs to have a large area and the cost increases.

As described in Japanese Patent Application Laid-Open No. 2-193607, the use of a crimped long-fiber nonwoven fabric results in the following:
Fraying and cost issues are resolved. However, in this general non-woven fabric, the fibers of the non-woven fabric are peeled off by hooks when repeatedly bonded by re-adhesion,
Also, the surface of the non-woven fabric is fluffed. The fluffy fibers cover the surface so as to hide other loop yarns, and the stripped fibers become stuck in the hooks. For this reason, there is a problem that when the fibers are repeatedly bonded, the fluffy fibers and the fibers clogged with the hooks hinder the bonding and reduce the bonding strength.

For this reason, the surface to be locked is divided into small compartments by a thermocompression bonding wire or the like to stop the separation and propagation of fibers. However, this method requires division in all directions, so it is so-called continuous. It was necessary to form thermocompression-bonded wires, and the resulting nonwoven fabric was hard.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to eliminate the above-mentioned problems, to provide a soft texture, and to reduce the bond strength even if the connection with the hook-shaped locking member is repeated. It is to provide a non-woven fabric for locking having a loop that does not.

[0007]

Means for Solving the Problems As a result of various studies on the surface fastener, the present inventors have found that it is important that the thermocompression bonding portions for fixing the fibers are independent from each other in order to give the nonwoven fabric flexibility. Furthermore, it has been found that the fastening strength of the fastener is not required in all directions, but rather in a specific direction of joining and peeling, the joining strength is required to withstand repeated use.

Based on this finding, the fibers of the non-woven fabric surface layer are fixed in parallel lines preferentially in the direction in which bond strength is required, and are combined so as to intersect with the fiber arrangement direction to form a crimping portion. The present invention has been completed by finding suitable conditions and completing a non-woven fabric for locking, which is flexible and has excellent locking performance.

That is, the present invention is as follows.

1. A non-woven fabric in which thermoplastic synthetic fibers constituting a web are joined by partial thermocompression bonding portions uniformly distributed over the entire surface, and which are characterized by the following (1) and (2).

(1) The thermocompression bonding portions are wire-shaped and independent of each other.

(2) The broken thermocompression-bonding portions are arranged in parallel lines so that the long side direction crosses a direction predominant to the arrangement direction of the fibers constituting the web, and the broken line shape is formed. And the other thermocompression-bonded parts arranged in parallel lines adjacent to each other in the direction predominant to the direction of arrangement of the fibers are arranged substantially 1 mm or more apart from each other in the direction of the parallel lines. Has been done.

2. The thermocompression-bonded portion having a disconnection shape and another thermocompression-bonded portion arranged in a parallel line adjacent to the thermocompression-bonded portion in a direction predominant to the fiber arrangement direction are substantially separated from each other in the direction of the parallel line. The non-woven fabric for locking according to the above 1, wherein the non-woven fabrics for locking are arranged without overlapping.

3. The aspect ratio of tensile strength of non-woven fabric is 2.0 ~
The non-woven fabric for locking according to 1 or 2 above, which is 8.0.

4. The non-woven fabric for locking according to the above 1, 2 or 3, wherein the fibers constituting the web are long fibers.

5. The non-woven fabric for locking according to the above 1, 2, or 3, wherein the fibers constituting the web are long fibers having crimps.

6. The non-bonding portion formed by adjacent rows of thermocompression bonding portions arranged in parallel lines has a width of 1 to 6 mm.

7. The width of the thermocompression bonding part is 0.3 to 1.5 mm,
The non-woven fabric for locking according to the above 1, wherein the thermocompression bonding portion has a length of 1.5 to 5 mm.

In the present invention, the hook-shaped locking member is a general fastener member in which hook-shaped or projection-shaped members are arranged which can scratch the fibers of the locking nonwoven fabric.

The present invention will be described in detail below.

In the present invention, the thermocompression bonding portions are wire-shaped and independent of each other, and are arranged in parallel lines so that the long side direction of the wire cutting crosses the direction predominant to the arrangement direction of the fibers constituting the web. And at least 1 m at the most in the direction of the parallel line with another parallel-line-shaped thermocompression-bonding portion adjacent to each other in the arrangement direction of the fibers.
It is arranged without being separated by m or more.

The phrase "arranged without being separated by 1 mm or more" means that d is less than 1 mm in FIG. 1, for example. Of course, the value of d may be 0 or less (minus), that is, adjacent parallel-line thermocompression-bonded portions may be arranged to overlap each other in the direction of the parallel lines. Note that d is also referred to as a separation distance.

Bonding for holding the strength of the non-woven fabric can be performed by hot air bonding or hydroentanglement in addition to thermocompression bonding, but the thermocompression bonding portion which is substantially interrupted in parallel lines is
It is preferably formed on at least the surface layer of the nonwoven fabric.

The non-woven fabric for locking is used so that when it is bonded to the hook-shaped locking member, the bonding is performed in a direction transverse to the direction in which the fibers are arranged. Therefore, the broken thermocompression-bonding portion has a long side crossing a direction predominant in the fiber arrangement direction, and at least an angle with the direction predominant in the fiber arrangement direction is in the range of 60 to 120 degrees. It is preferable to arrange them.

The direction predominant to the fiber arrangement direction is a direction in which the fiber arrangement direction is large on the surface of the non-woven fabric. As an index showing the fiber arrangement direction, the strong aspect ratio of the non-woven fabric is the arrangement direction. Since it represents the degree of, it can be said to be appropriate as an index.

In the present invention, the nonwoven fabric has a strong aspect ratio of preferably 2.0 to 8.0, more preferably 2.5 to 8.0.
It is 6.0. When the aspect ratio of the strength is 2.0 or more, the fibers in the longitudinal direction are arranged well, and the fibers forming the loop are arranged without being disturbed as a whole, so that the hook is effectively hooked for the binding strength. Sufficient and high binding strength is obtained. Furthermore, the fixed length of each fiber in the loop is uniform and acts like multiple aligned yarns, making it difficult for the single yarn to break when the hook is peeled off, and the hook-shaped engagement is maintained even after repeated locking. A high bond strength with the stop member can be obtained.
When the aspect ratio of the strength is 8.0 or less, the strength of the nonwoven fabric itself is sufficiently high, and the nonwoven fabric itself is not torn or broken when peeled from the hook-shaped locking member.

In the present invention, the fibers forming the nonwoven fabric are preferably long fibers from the viewpoint of strength and the like, and more preferably crimped fibers from the viewpoint of easy formation of loops.

In the present invention, the thermocompression-bonding portions are wire-shaped and independent of each other, and are arranged in parallel lines so that the long side direction of the wire-breaking crosses the predominant direction of the arrangement direction of the fibers constituting the web. And at least 1 mm at the most in the direction of the parallel line with another parallel line-like thermocompression-bonded portion which is adjacent to the fiber arrangement direction.
It is arranged without being separated from the above. Therefore, the non-woven fabric is excellent in softness, and when peeling off the hook-shaped locking member which is further bonded, the fibers are not continuously stripped off for a long time and can be locked repeatedly. In particular, the thermocompression bonding portion has a wire-breaking shape, and the non-compression bonding portion is formed around the thermocompression bonding portion, so that it has an excellent feature of being soft.

On the other hand, it is often considered that the single yarn is easily stripped off for a long time when the locking member is peeled off.
The broken thermocompression bonding parts are arranged in parallel lines so as to traverse a direction predominant in the fiber arranging direction, and substantially parallel to other parallel linear thermocompression bonding parts adjacent to the fiber arranging direction. Since the fibers are arranged so as not to be separated by 1 mm or more at the widest in the direction of the parallel lines, the fibers are not single-filamentary and long-stripped.

Further, by shortening the above separation distance, preferably by setting it to 0.5 mm or less,
Or, by arranging them without overlapping,
It is possible to more effectively prevent continuous peeling of fibers. The above-mentioned distance affects the softness of the non-woven fabric together with the distance between the rows of other wire-shaped thermocompression-bonded portions arranged in parallel, and therefore it is preferable to select it appropriately according to the application.

The width of the thermocompression bonding portion (fiber arrangement direction) is preferably at least 0.3 to 1.5 mm, and 0.5 to 1.0.
mm is more preferable. The length of the thermocompression bonding portion (direction crossing the fiber arrangement) is preferably at least 1.5 to 5 mm,
1.5-3.5 mm is more preferable. When the thermocompression bonding portion is in this range, the flexibility as a nonwoven fabric is good, and
When the hook-shaped locking member is peeled off sufficiently by thermocompression bonding, the fibers are peeled off without fluffing, so the surface of the non-woven fabric for locking is not covered with long fluffed fibers. As a result, as a surface fastener, the bondability does not deteriorate even if the bonding and peeling are repeated.

The thermocompression-bonding portion can be formed by thermocompression-bonding a non-woven fabric. For example, a method using a carved roll or pressing a flat plate can be used. Is preferred. As a method of using a roll, a combination of one roll as an engraving roll and the other as a smooth metal roll,
As the engraving roll for both the upper and lower sides, there is a method of butting. The degree of thermocompression bonding depends on the temperature of the upper and lower rolls, depending on the required performance of the resulting nonwoven fabric such as strength or fuzzing property.
It is determined by setting the contact pressure and the like, but from the viewpoint of strength and feel, it is preferable to set the pressure bonding temperature below the melting point of the fiber used.

In the present invention, the non-crimped portion is a non-crimped portion between parallel lines of the thermocompression-bonded portion and the parallel-line thermocompression-bonded portions which are adjacent to each other in the direction in which the fibers are arranged. Then, it refers to a non-pressure-bonded portion formed between adjacent rows of thermocompression-bonded portions arranged in parallel lines. The fibers in the non-crimped portion do not bond to each other and form a loop between the thermocompression-bonded portions.

In the present invention, the width of the non-pressed portion is 1 to 6 m.
It is preferably m, and more preferably 1 to 4 mm. When the width of the non-crimping portion is within the above range, the loop formed by the fibers in the non-crimping portion is appropriate, and sufficient hooking to the hook-shaped locking member is obtained, so high bonding strength is obtained. When the hook-shaped locking member is peeled off, the fibers are peeled off without fluffing for a long time, so the surface of the non-woven fabric for locking is not covered with long fluffy fibers, and as a result, bonding and peeling are repeated. However, the binding strength does not decrease.

An example of a wire-like thermocompression-bonded portion in the non-woven fabric for locking of the present invention is shown in FIGS.

In FIG. 1, AA 'represents a direction predominant in the arrangement direction of the fibers, and θ is an angle at which the long side of the thermocompression bonding portion crosses the predominant direction. a is the width of the thermocompression bonding part, b
Is the length of the thermocompression bonding portion, c is the width of the non-compression bonding portion, and d is the distance between adjacent parallel line thermocompression bonding portions. FIG. 2 shows an example in which adjacent parallel-line thermocompression-bonded portions are arranged without being separated from each other, and d ′ represents an overlapping distance between the adjacent parallel-line thermocompression-bonded portions.

In the present invention, the fibers used are:
Thermoplastic fibers, particularly crystalline thermoplastic fibers, are preferable in terms of formation of thermocompression bonding parts, strength, etc., for example, polyolefin fibers such as polypropylene fibers that are lightweight and easy to crimp, high single yarn strength and good dimensional stability. Examples thereof include polyester fibers such as polyethylene terephthalate fibers, nylon 6 having high single yarn strength and good cloth flexibility, and polyamide fibers such as nylon 66. These fibers can be used alone or as a mixture. . Further, although these fibers can be used as the composite fibers, the fibers composed of a single component are more preferable in terms of cost and recyclability.

The nonwoven fabric of the present invention may be composed of a long fiber web or a short fiber web made of the above fibers. Preferably, it is made of a long fiber web, which is advantageous in terms of strength, in order to reduce yarn breakage when peeling from the hook-shaped locking member.

In the present invention, the fineness of the single fiber constituting the non-woven fabric is preferably 0.5 to 11.0 dtex, more preferably 1.0 to 5.0 dtex. When the fineness of the monofilament is within this range, the monofilament is hard to be broken, a high bonding strength with the hook-shaped locking member is obtained, and a non-woven fabric for locking having a soft texture is obtained.

In the present invention, it is preferable to use crimped fibers as the fibers, because the nonwoven fabric becomes bulky and the binding adaptability to various hook shapes of the hook-shaped locking member is improved. The crimp is preferably a continuous filament having a spiral crimp, and the number of crimps is preferably 2 pieces / 25 mm or more. The spiral diameter of the spiral crimp is preferably 0.3 to 1.0 mm. If the spiral diameter of the spiral crimp is in this range, the number of crimps per unit length is appropriate, and the space obtained by the spiral shape is large, so the bulkiness is excellent and the effect of the crimped fiber is effectively exhibited. To be done.

The crimped fiber with a single component may be one physically formed by an asymmetric cooling method in which the yarn is nonuniformly cooled during the fiber production, or by using the composite fiber method. Fibers formed by crimping by the bimetal effect may be used.

The cross-sectional shape of the fiber may be an ordinary round shape or a shape formed by deforming this to have a special shape.
The crimped fiber having a single component preferably has a specially shaped cross section from the viewpoint of crimp expression. In this case, the cross-sectional shape of the fiber is preferably a shape having a convex portion or a concave portion in at least a part of the cross section.

In the present invention, the basis weight of the non-woven fabric for locking is
It can be arbitrarily selected according to the purpose of use, but is 10 to 150 g /
m ² is preferable, and 20-60 g / m ² is more preferable from the viewpoint of convenience of handling in consideration of practical lightness, strength and the like.

[0044]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be further described below with reference to Examples and Comparative Examples.

The measuring method, evaluation method and the like are as follows.

(1) Bonding strength A hook-shaped locking member having a width of 3 cm, in which about 400 hooks having a height of about 0.5 mm are provided per cm ² , and the nonwoven fabric (width of 3 cm) prepared in the examples or comparative examples, A roller having a length of 3 cm and a weight of 700 g was used for weighting and bonding to obtain a bonded body.

Using a tensile tester manufactured by Shimadzu Corporation,
The upper and lower parts of the unbonded part of the bonded body were grasped, a tensile test was carried out at a gripping width of 100 mm and a test speed of 300 mm / min, the maximum strength was read, and the value obtained by dividing this by the area of the bonded portion (N / cm ² ). Further, the test was conducted by repeatedly binding.

(2) Tensile strength of non-woven fabric A test piece having a width of 3 cm and a length of 20 cm was prepared by Shimadzu Corporation.
A tensile tester was used to perform a tensile test at a grip width of 100 mm and a test speed of 300 mm / min. The strength was measured with the longitudinal direction being the direction predominant to the direction of arrangement of the fibers of the non-woven fabric, and the transverse direction being the direction at 90 ° to that direction, and the value obtained by dividing the longitudinal strength value by the transverse strength value was taken as the aspect ratio. .

(3) Thickness of Nonwoven Fabric A peacock type thickness measuring instrument was used to measure the thickness under a load of 100 g / cm ² .

[Example 1] Polypropylene (JIS-K
MFR = 40) measured under the condition 14 of Table 1 of 7210 was used as a raw material, and long fibers melt-extruded from a nozzle having a round cross section were cooled laterally in the vicinity of the spinneret while being drawn by a towing / drawing device such as an air sucker. I took it. The yarn exiting the towing and take-up device was passed through a charging device to open the fiber, and then collected as a web on a moving wire mesh conveyor. Next, this web was conveyed and passed through a heating roll engraved with a wire-like pressure-bonded portion to partially bond the web to obtain a nonwoven fabric having a thermo-pressure bonded portion and a non-pressure-bonded portion.

The constituent fiber of the obtained non-woven fabric is 2.8 dt.
ex, the basis weight is 40 g / m ² , and the broken thermocompression bonding portion has a width of 0.4 mm and a length of 2.6 mm, the non-crimping portion has a width of 1.3 mm, and a separation distance (d) is It was 0.1 mm and was excellent in flexibility.

When the obtained non-woven fabric was used as a loop locking material (non-woven fabric for locking) and bonded to a hook-shaped locking member, it had sufficient bonding strength.

Further, the binding of the locking nonwoven fabric and the hook-shaped locking member was repeated. When the loop yarn in the non-crimped portion is applied with tension by the hook at the time of peeling, the loop yarns whose both ends are fixed by the broken thermocompression-bonded portion are cut in the non-crimped portion, so that the fiber length is short, but the fiber length is short. There was little fluffing on the surface of the non-woven fabric, and the loop was not hidden. Further, it was found that the fibers that were cut and dropped in the hook were less likely to be clogged, so that it did not hinder repeated binding. Even when the bonding and peeling were repeated 10 times, the same bond strength was maintained. The results are shown in Table 1.
Shown in.

Example 2 Polypropylene (JIS-K
A long fiber melt-extruded from a V-shaped odd-shaped nozzle using MFR = 40) measured under the condition 14 of Table 1 of 7210 as a raw material was laterally cooled in the vicinity of the spinneret and taken by a towing / drawing device. This yarn had a spiral crimp. The yarn discharged from the towing and take-up device was treated in the same manner as in Example 1 to obtain a nonwoven fabric.

As a result of evaluating the obtained non-woven fabric, the bonding performance with the hook-shaped locking member was the same as in Example 1.
The results are shown in Table 1.

Example 3 A nonwoven fabric having a constituent fiber of 2.0 dtex and a basis weight of 40 g / m ² was obtained in the same manner as in Example 1 except that nylon 6 was used instead of polypropylene. The obtained non-woven fabric was excellent in flexibility utilizing the characteristics of nylon 6 fiber.

As a result of evaluating the obtained nonwoven fabric, the bonding performance with the hook-shaped locking member was the same as in Example 1.
The results are shown in Table 1.

Example 4 In the same manner as in Example 1 except that polyethylene terephthalate was used instead of polypropylene, the constituent fiber was 2.0 dtex and the basis weight was 40 g / m 2.
A nonwoven fabric of ² was obtained. The obtained non-woven fabric was a flexible non-woven fabric having the peculiar stiffness of polyester fiber.

As a result of evaluating the obtained non-woven fabric, the bonding performance with the hook-shaped locking member was the same as in Example 1.
The results are shown in Table 1.

Example 5 Polyethylene terephthalate was used in place of polypropylene, and the width of the broken thermocompression bonding portion was 0.7 mm.
A nonwoven fabric having a constituent fiber of 2.0 dtex and a basis weight of 40 g / m ² was obtained.

As a result of evaluating the obtained nonwoven fabric, the bonding performance with the hook-shaped locking member was the same as in Example 1.
The results are shown in Table 1.

Example 6 Polyethylene terephthalate was used instead of polypropylene, and the width of the non-pressed portion was 2.
A nonwoven fabric having a constituent fiber of 2.0 dtex and a basis weight of 40 g / m ² was obtained in the same manner as in Example 1 except that the length was 0 mm. The obtained non-woven fabric was excellent in flexibility and further improved.

As a result of evaluating the obtained nonwoven fabric, the bonding performance with the hook-shaped locking member was the same as in Example 1.
The results are shown in Table 1.

[Embodiment 7] Polyethylene terephthalate was used instead of polypropylene, and the broken thermocompression bonding portion had a width of 0.35 mm and a length of 2.8 mm, and the non-compression bonding portion had a width of 1.2 mm and adjacent parallels. Constituent fiber 2.0 dtex, as in Example 1 except that the linear crimp portions were arranged so as not to be separated from each other and overlapped with each other, and the overlap was 0.2 mm.
A non-woven fabric having a basis weight of 40 g / m ² was obtained. The obtained non-woven fabric is
Although slightly inferior to Examples 4, 5, and 6, the nonwoven fabric was soft.

As a result of evaluating the obtained non-woven fabric, the bonding performance with the hook-shaped locking member was the same as in Example 1.
The results are shown in Table 1.

[Embodiment 8] The structure is the same as that of Embodiment 1 except that the thermocompression-bonding portion is arranged so that the long side of the thermocompression-bonding portion intersects with the direction in which the fibers are arranged at an angle of 75 degrees. A nonwoven fabric having a fiber weight of 2.8 dtex and a basis weight of 40 g / m ² was obtained. The resulting non-woven fabric was flexible.

As a result of evaluating the obtained nonwoven fabric, the bonding performance with the hook-shaped locking member was the same as in Example 1.
The results are shown in Table 1.

[Embodiment 9] Constituent fiber 2.8d was prepared in the same manner as in Embodiment 1 except that the width of the thermocompression bonded portion was 0.2 mm.
A non-woven fabric having a tex and a basis weight of 40 g / m ² was obtained. The obtained non-woven fabric had good flexibility.

As a result of evaluating the bonding performance of the obtained nonwoven fabric with the hook-shaped locking member, it was found that the nonwoven fabric had a sufficient bonding strength at the initial stage, but when the bonding and peeling were repeated, the fibers on the nonwoven fabric surface gradually became By the hook, the pressure-bonded portion came to be continuously peeled off without being cut, and the surface of the nonwoven fabric tended to be covered with long fluffy fibers. The results are shown in Table 1.

[Example 10] The same as Example 1 except that when forming the web, the yarns were opened so that the difference in the fiber arrangement in the length and width was reduced, and the strong aspect ratio of the cloth was set to 1.8. A non-woven fabric was obtained.

As a result of evaluating the binding performance of the obtained non-woven fabric with the hook-shaped locking member, although the hook is caught by the loop yarn, the number of yarns that are hooked together is small and the binding strength with the hook-shaped locking member is high. It fell a little. In addition, there are many fibers that are not fixed by the broken thermocompression bonding part,
Repeated peeling tends to break the fibers and cover the surface of the non-woven fabric with long, fluffy fibers.
After 0 repetitions, it took less time. The results are shown in Table 1.

[Example 11] The same as Example 1 except that when forming the web, the yarns were opened so that the difference in fiber arrangement in the length and width was increased, and the strong aspect ratio of the cloth was 8.5. hand,
A non-woven fabric was obtained. The flexibility of the obtained non-woven fabric was about the same level.

As a result of evaluating the binding performance of the obtained non-woven fabric with the hook-shaped locking member, the initial non-woven fabric has a sufficient binding strength, but the lateral strength of the non-woven fabric itself is low. The non-woven fabric tended to be torn and became unusable after 10 repetitions. The results are shown in Table 1.

[Comparative Example 1] A non-woven fabric was formed in the same manner as in Example 1 except that the fibers were joined together by point-like partial thermocompression bonding (0.45 mm diameter, 1.5 mm intervals, zigzag arrangement). did. The resulting non-woven fabric was continuous, although it had bulges in the non-pressed portion, and was excellent in flexibility.

As a result of evaluating the binding performance of the obtained nonwoven fabric with the hook-shaped locking member, it was found that it had a sufficient binding strength at the initial stage, but when the binding and peeling were performed, the fibers on the surface of the nonwoven fabric were peeled off once. Is peeled off with a hook, the surface of the non-woven fabric is covered with long fluffy fibers, and the broken long fibers are stuck in the hook, and even if they are bonded next time, sufficient bonding strength is not obtained The bond strength was greatly reduced, and after repeated 5 times, there was a lot of fuzz and it could not be used. The results are shown in Table 1.

[Comparative Example 2] A constituent fiber of 2.0 dt was prepared in the same manner as in Example 1 except that the separation distance (d) was 3 mm.
A non-woven fabric having an ex and a basis weight of 40 g / m ² was obtained. The obtained non-woven fabric was excellent in flexibility.

The obtained non-woven fabric was evaluated for the binding performance with the hook-shaped locking member. As a result, similar to Comparative Example 1, it had a sufficient binding strength at the initial stage, but once it was bound and peeled, By the peeling, the fibers on the surface of the non-woven fabric were peeled off by the hooks, and there was a problem that the surface of the non-woven fabric was covered with long fluffy fibers that propagated through the separated portions of the thermocompression-bonded portion having a wire break. In addition, the broken long fibers are clogged in the hooks, sufficient bond strength cannot be obtained even if they are bonded next time, the bond strength is greatly reduced after two repetitions, and many fuzzes occur after five repetitions, so that they cannot be used. It was a thing. The results are shown in Table 1.

[0078]

[Table 1]

[0079]

INDUSTRIAL APPLICABILITY The non-woven fabric for locking of the present invention is useful as a locking material for a fastener, and since the thermocompression bonding portions are wire-shaped and independent from each other, they have a soft texture. Further, the wire-shaped thermocompression-bonded portion is arranged in parallel lines so that the long side direction crosses a direction predominant in the arrangement direction of the fibers forming the web, and the wire-shaped thermocompression-bonded portion, By other thermocompression-bonded portions arranged in parallel lines that are adjacent to each other in a direction predominant to the direction of arrangement of the fibers, substantially at least 1 mm apart from each other in the direction of the parallel lines. As a non-woven fabric for locking hook-and-loop fasteners, it exhibits sufficient bond strength.

Furthermore, at the time of peeling from the hook-shaped locking member, the thermocompression bonding portion around the loop interrupts the fluff on the surface due to the fibers to be stripped off, so that the fluff on the surface is reduced and the cut fibers are cut. Does not easily get stuck in the hook, and the bond strength does not decrease even after repeated bonding and peeling.

In the application of the surface fastener, the present invention is particularly useful and can sufficiently exert the effect when the attachment site requires flexibility.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of an arrangement of a wire-like thermocompression bonding portion in a non-woven fabric for locking of the present invention.

FIG. 2 is a diagram showing another example of the arrangement of the wire-like thermocompression-bonded portions in the locking nonwoven fabric of the present invention. (This is an example of a case where a thermocompression bonding portion and another thermocompression bonding portion that is arranged adjacent to and in parallel with each other overlap each other in the direction of the parallel lines.)

[Explanation of Codes] AA '... A direction predominant in the arrangement direction of fibers a ... Width of thermocompression bonding portion b ... Length of thermocompression bonding portion c ... Width of non-compression bonding portion ... Adjacent to thermocompression bonding portion Separation distance d'of the other thermocompression-bonded portions arranged in parallel lines ... Length of the overlapping portion when the separation distance (d) is 0 or less ... In the long side direction of the thermocompression-bonded portion and the fiber arrangement direction Angle with dominant direction

Claims (7)

[Claims] 1. A thermoplastic synthetic fiber constituting a web,
A non-woven fabric bonded by partial thermo-compression bonding parts uniformly distributed over the entire surface, which is characterized by the following (1) and (2). (1) The thermocompression bonding portions are wire-shaped and independent of each other. (2) The broken thermocompression bonding parts are arranged in parallel lines so that the long side direction thereof crosses a direction predominant to the arrangement direction of the fibers forming the web, and the broken thermocompression bonding is performed. And other thermocompression-bonded portions arranged in parallel lines that are adjacent to each other in a direction predominant to the direction of arrangement of the fibers are arranged substantially 1 mm or more apart from each other in the direction of the parallel lines. . 2. The broken thermocompression-bonding portion and another thermocompression-bonding portion arranged in parallel line adjacent to the thermocompression-bonding portion in a direction predominant to the fiber arrangement direction are substantially parallel to each other. The non-woven fabric for locking according to claim 1, wherein the non-woven fabrics for locking are arranged so as not to be separated in the direction of the line but to be overlapped with each other. 3. The aspect ratio of tensile strength of the nonwoven fabric is 2.0 to
The non-woven fabric for locking according to claim 1 or 2, wherein the non-woven fabric for locking is 8.0. 4. The non-woven fabric for locking according to claim 1, 2 or 3, wherein the fibers constituting the web are long fibers. 5. The non-woven fabric for locking according to claim 1, 2 or 3, wherein the fibers forming the web are long fibers having crimps. 6. The non-woven fabric for locking according to claim 1, wherein a width of a non-crimp portion formed by adjacent rows of thermo-compression portions arranged in parallel lines is 1 to 6 mm. 7. The non-woven fabric for locking according to claim 1, wherein the width of the thermocompression bonding portion is 0.3 to 1.5 mm, and the length of the thermocompression bonding portion is 1.5 to 5 mm.