JP2006281545A - Laminated nonwoven fabric for locking material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated nonwoven fabric for a locking material having loops capable of suppressing the fluffing of fibers on the surface of a nonwoven fabric at the time of peeling corresponding to a hook-like locking member, especially a shallow multipoint hook-like loking material to hold the form of the member against the load at the time of locking, obtaining efficient bonding strength with respect to the hook-like locking member and not lowered in its bonding strength even if bonded repeatedly. <P>SOLUTION: In the laminated nonwoven fabric for the locking material wherein a surface layer is a laminated nonwoven fabric composed of a thermoplastic fiber web or nonwoven fabric and at least one another nonwoven fabric, a non-hot press bonding region, which has a basis weight of 150 g/m<SP>2</SP>or below and a fineness of 11 decitex or below and is formed by surrounding the surface layer by a partial hot press bonding part, is arranged and a preferential direction is imparted to the fiber arrangement of the surface layer so as to efficiently obtain bonding strength by the selection of a locking direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a laminated nonwoven fabric for a locking material, and more particularly to a nonwoven fabric for a locking material having a loop that can be repeatedly coupled, which is used for a hook-shaped locking member in a hook-and-loop fastener. It is related with the laminated nonwoven fabric for latching materials which has the outstanding loop part.

  Conventionally, in a hook-and-loop fastener, a woven or knitted fabric formed with a loop made of natural fibers or synthetic fibers and a hook-shaped locking member are fixed in advance to 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, a method of joining a woven or knitted fabric in which a loop such as a tricot is formed and a hook-like locking member is used for fixing a seat cover of a vehicle, an airplane or the like, or fastening a disposable diaper.

  However, in knitted and knitted fabrics formed with loops such as tricots used for these purposes, fibrous fraying and the like occur when cut, so there is a problem that trouble occurs in the manufacturing process, and as a preventive measure Although measures such as anti-fraying processing and anti-fraying treatment, as well as pasting the backing material, are taken, there are problems such as high costs.

  If the non-woven fabric of crimped long fibers disclosed in Patent Document 1 is used, the fraying and cost problems as described above are solved. However, when such a general nonwoven fabric is repeatedly bonded by reattachment or the like, there is a problem that the fibers of the nonwoven fabric are peeled off by hooks and the surface of the nonwoven fabric is fluffed. In this case, the fluffy fiber covers the surface so as to hide other loop yarns, and the peeled fiber is in a state of being clogged in the hook. 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.

Regarding fiber bonding, there is a proposal of a non-woven fabric having a matrix-like thermocompression bonding part as in Patent Document 2, but if fibers are loosely fixed to form a loop that can be easily locked, tension and the like during use will be increased. For this reason, the shape of the locking member itself is liable to collapse, and there is a problem such as form retention due to a load at the time of fixing the member to the necessary part or locking.
JP-A-2-193607 Japanese Patent Laid-Open No. 11-75912

  The object of the present invention is to eliminate the above-mentioned drawbacks, and to have a loop that does not decrease the bonding strength even when it is repeatedly bonded to the hook-shaped locking member, and has excellent shape retention during actual use. It is providing the nonwoven fabric for materials.

In order to solve the above-mentioned problems, the present inventors have studied in detail how to use a hook-and-loop fastener, and, for example, investigated the state of the connecting surface. In recent hook-and-loop fasteners, it is only necessary to hook a loop with a hook. However, the shape of the hook has been improved, for example, the shape of the hook tends to be shallow and small, and the number of units per unit area and the density of the hook are large. It was found that the shape of the hook was improved to such an extent that it was smooth and dense enough to feel no unevenness even when traced, and it did not feel uncomfortable when touched by hand. For example, the height of the hook is as small as about 0.2 mm, and the number is about 250 pieces / cm ² . Therefore, the trend of hook materials of recent hook-and-loop fasteners is to use conventional large and deep hooks to lock the fibers as strongly as possible to obtain bond strength. It has been changed to the idea of locking a lot and obtaining bond strength.

  On the other hand, with regard to the loop material, conventionally, the loop material of the nonwoven fabric in particular has been loosened and widened in the non-fixed state in order to facilitate the locking. Is flexible but inferior in form stability, and has a problem that it is easily deformed by a load at the time of fixing the loop material or at the time of locking.

  The present inventor made studies with the aim of finding a loop material that can be adapted to recent hook shapes and has excellent shape retention. The stop area is not covered, the fluff adhesion to the hook is reduced, and the loop fiber layer for locking is made as thin as possible within the required range to make it a rough structure with low weight, Furthermore, the present inventors have found that it is effective not to use the same fiber layer as that of the loop material but to laminate at least one or more nonwoven fabrics serving as a base fabric, and have reached the present invention. That is, the invention claimed in the present application is as follows.

(1) In a laminated nonwoven fabric composed of a surface layer composed of a thermoplastic fiber web or a thermoplastic fiber nonwoven fabric and at least one layer of another thermoplastic fiber nonwoven fabric, the fineness of the fibers constituting the laminated nonwoven fabric is 1 dtex or more 11 decitex or less, the basis weight is 150 g / m ² or less, and the surface layer has a non-thermocompression zone formed substantially surrounded by a thermocompression bonding portion. Laminated nonwoven fabric for materials.
(2) The laminated nonwoven fabric for a locking material according to (1), wherein the web or the nonwoven fabric of the surface layer includes long fibers that are preferentially arranged so as to cross the locking direction of the web or the nonwoven fabric. .

(3) A length of the non-thermocompression bonding area (non-fixed length) is 7 mm or less, wherein the laminated nonwoven fabric for locking material according to (1) or (2).
(4) The laminated nonwoven fabric for a locking material according to any one of (1) to (3), wherein the shape of the non-thermocompression bonding region is a round shape or a square shape.

(5) The laminated non-woven fabric for a locking material according to any one of (1) to (4), wherein an occupied area of one portion of the non-thermocompression bonding region is ² to 100 mm ² .
(6) The laminated nonwoven fabric for a locking material according to any one of (1) to (5), wherein the thermocompression bonding section has a width of 0.5 mm or more.

(7) The method according to any one of (1) to (6), further including a discontinuous partial thermocompression bonding portion formed in a pattern different from the thermocompression bonding portion forming the non-thermocompression bonding region. Laminated nonwoven fabric for locking material.
(8) The laminated nonwoven fabric for a locking material according to any one of (1) to (7), wherein the fiber constituting the laminated nonwoven fabric contains a crimped fiber.

  In the present invention, the thermoplastic non-woven fabric used for the surface layer has a closed non-thermocompression bonding zone formed substantially surrounded by a thermocompression bonding portion in order to maintain flexibility and excellent peelability. It is necessary to have.

  In the present invention, the non-thermocompression bonding area is a non-thermocompression bonding area formed between the crimping part and the crimping part so as to be surrounded by the locking thermocompression bonding part. The fibers form a loop between the thermocompression bonding parts for locking without being bonded to each other.

  By selecting an appropriate length for this non-thermocompression bonding area (non-fixed length), the fluff length will be shortened even when cut, and the locking area will not be covered with cutting fibers, and Also difficult to adhere. The length of the preferred non-thermocompression bonding area is 7 mm or less, preferably 5 to 1 mm. This thermocompression bonding part may also serve as a joint with the laminated nonwoven fabric.

  Furthermore, in order to obtain the necessary binding strength in the hook-and-loop fastener, the basic consideration is that the number of fibers locked to the hook is basically the same. It has been found that it is possible to have a unidirectional bond strength by biasing the fiber arrangement direction, that is, by making the fiber arrangement direction dominant in the direction crossing the locking direction necessary for fastener bonding. . That is, the nonwoven fabric of the surface layer of the present invention preferably has long fibers that are preferentially arranged so as to cross the locking direction of the nonwoven fabric. If such a fiber arrangement is used, it is considered that the fibers are bundled at the time of locking and the effective fibers are increased and are more difficult to cut than the random arrangement. It has also been found that it is preferable to reduce the depth of locking and increase the number of locking points from the standpoint of fluffing and binding strength of the fibers after locking, in order to suppress the breakage of the base material.

  The shape of the thermocompression bonding part and the non-thermocompression bonding part surrounded by it depends on the shape and height of the hook material for locking, but it is thermocompression bonding as shown in Fig. 1 (1), (2) and (3). As shown in FIGS. 2 (1) and 2 (2), in which the portion 1 is a continuous matrix (in the figure, 2 is a non-thermocompression zone, and the aa ′ cross section is shown in the same drawing). Although the crimping | compression-bonding part 1 is discontinuous, the circumference | surroundings of the non-thermocompression-bonding area | region 2 can raise shapes, such as what was enclosed with the omnidirectional thermocompression-bonding part 1. FIG. The thermocompression bonding part 1 may be referred to as a locking thermocompression bonding part.

  When the thermocompression bonding part 1 is discontinuous, it becomes a softer cloth than the one where the thermocompression bonding part is continuous, but since a part of the fibers surrounded by the omnidirectional thermocompression bonding part tends to fluff, The shortest distance between the crimping parts is preferably 7 mm or less, and more preferably 5 mm or less. Although the area ratio of a thermocompression bonding part changes with required coupling | bonding strength, a latching area, the magnitude | size of non-thermocompression bonding area | region, and arrangement | positioning, 10 to 70% is preferable, More preferably, it is 20 to 50%. If it is less than 10%, it is flexible, but the fixation of the fiber is weak or less, and it becomes easy to fluff. If it exceeds 70%, the non-thermocompression zone to be locked becomes small, it becomes difficult to lock, the bonding strength becomes weak, and the whole becomes too hard. In other words, the area ratio of the non-thermocompression bonding region is preferably 30 to 90%.

In the non-thermocompression bonding zone in the present invention, the occupied area of one point is substantially closed space, preferably 2~100mm ^2, 4~50mm ² is more preferable. If it is less than 2 mm ² , the swell of the fiber layer to be locked is small and difficult to lock, and if it exceeds 100 mm ² , the cut fiber becomes too long. Practically, it is necessary to set according to the shape of the hook to be used.
Although the meaning of the width of the thermocompression bonding portion differs depending on the shape of the thermocompression bonding portion, at least 0.3 mm, preferably 0.5 mm or more, in order to sufficiently fix the fiber and obtain a sufficient locking area. It is preferably within a range of 0.0 mm or less.

  In the present invention, the direction in which the fibers are preferentially arranged is a direction in which the fiber arrangement direction on the nonwoven fabric surface is large. In particular, in the present invention, the fiber arrangement of the surface layer is important, and the web forming the surface layer Alternatively, it is preferable that the fibers are aligned in a dominant direction so that the nonwoven fabric crosses the locking direction. The index indicating the fiber arrangement direction almost appears in the strong aspect ratio of the nonwoven fabric, the aspect ratio is preferably in the range of 1.5 to 8.0, more preferably in the range of 2.0 to 8.0, and more The effect of the fiber arrangement can be exhibited. When the strength aspect ratio is less than 1.5, the fibers forming the loop are disordered and arranged, so that the hook to the effective binding strength is reduced and the binding strength is lowered. 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. In the present invention, when the surface layer can directly measure the strength of the web or the nonwoven fabric, the strength ratio in the machine (longitudinal) and width (lateral) directions, and when the web or the like cannot be measured as it is, The relative strength ratio can be confirmed by joining the webs.

In practical use, when the laminated non-woven fabric is slit into a tape shape, when the cut surface is open, the occurrence of fraying is a problem, and in order to maintain the strength and dimensional stability of the non-woven fabric, together with a thermocompression bonding part effective for loop formation, Separately from the thermocompression bonding part, a non-continuous partial thermocompression bonding part having a pattern different from the thermocompression bonding part in order to maintain the dimensional stability without hindering the function of the loop formation and the loop. It is preferable to combine them. As the discontinuous partial thermocompression bonding portion, a dot-like partial thermocompression bonding portion having a pattern different from that of the locking thermocompression bonding portion, such as a discontinuous round shape or a square shape, is preferable. . Area per one of the partial thermocompression bonded portions is preferably 0.03 mm ² to 5 mm ^2, the spacing 0.5mm~4.0mm is preferred. The partial thermocompression bonding part and the locking thermocompression bonding part may have a partially overlapping portion. The area ratio of partial thermocompression bonding is preferably 3 to 50%, more preferably 5 to 30%.

  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 a composite fiber, a fiber composed of a single component is more preferable from the viewpoint of cost and recyclability. In addition, the front material for latching and the backing material for reinforcement may be the same material or different materials. From the standpoint of shape retention, the backing material is preferably a polyolefin fiber or a polyester fiber that hardly changes in moisture absorption.

  In addition, the surface layer of the laminated 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 in terms of strength in terms of being less likely to cause thread loss. What is comprised from the continuous fiber web which consists of is preferable.

  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 single yarn is easily cut and the bonding strength with the hook-shaped locking member is lowered. Further, when the single fiber fineness exceeds 11.0 dtex, the single yarn is difficult to break, but the texture of the obtained nonwoven fabric becomes hard and the flexibility as a locking material is impaired.

  It is more preferable to use crimped fibers as the fibers of the present invention because the resulting nonwoven fabric is bulky and the adaptability to locking is improved with respect to various hook shapes of the hook-shaped locking member. The crimp is preferably formed as a continuous filament having a helical crimp, and the number of crimps is preferably 2 or more / 25 mm. The higher the number of crimps, the more preferable. 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, resulting in poor bulkiness. If the crimped spiral diameter is less than 0.3 mm, the space obtained by the spiral shape will be extremely small. The bulkiness is inferior, and the effect of crimped fibers cannot be exhibited.

  Furthermore, the fiber used in the present invention may be formed in a special shape obtained by deforming the fiber in addition to the 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. It can be made of crimped fibers.

  The laminated nonwoven fabric of the present invention is joined by partial thermocompression bonding, but the thermocompression bonding part for locking and the discontinuous thermocompression bonding part are formed by using a sculpted roll, a flat plate It can also be formed by a method of pressing the. The roll method is preferred in terms of production efficiency. Moreover, you may form using the method etc. which match | combine as the combination which makes one engraving roll and the other a smooth metal roll, and the upper and lower co-engraving rolls. The degree of thermocompression bonding is determined by setting the upper and lower roll temperatures and contact pressure according to the required performance such as the strength of the nonwoven fabric obtained, the degree of fiber fixation or fuzziness, etc. Is preferably set below the melting point of the fibers used. The locking thermocompression bonding part and the dotted discontinuous thermocompression bonding part may be applied simultaneously or in two stages.

Basis weight of the laminated nonwoven fabric of the present invention can be arbitrarily selected according to the intended purpose, as a whole lightness, is preferably in the range from convenience of 10 to 150 g / m ² of handling that took into consideration the strength and the like, practically 20 g / m ² A range of ˜60 g / m ² is preferred. In addition, the nonwoven fabric or web of a surface layer should just be a fabric weight of the grade which has a function for latching, and 5-50 g / m < ² > is preferable also in forming a rough structure, More preferably, it is 10-30 g / m < ² >. It is.

The backing nonwoven fabric having a reinforcing function as the base fabric for the support preferably has a basis weight of 15 to 120 g / m ² , more preferably 20 to 60 g / m ² . In addition to bonding using an embossing pattern for locking, an adhesive, a welder method, and the like are effective for these bondings, but a thermocompression bonding method is preferable in terms of efficiency and applicability.

  Note that the hook-shaped locking member used in the present invention may be a general hook-shaped hook or hook-shaped member on which fibers can be hooked. In view of the above, a structure as shown in FIG. 3 in which the depth of locking is shallow and the number of locking is increased is also effective in suppressing the destruction of the base material.

  In the nonwoven fabric of the present invention, the surface layer is a thermoplastic fiber web or a thermoplastic fiber nonwoven fabric, and is formed by being surrounded by a locking thermocompression bonding portion, and a non-thermocompression bonding region that becomes a substantially closed region is disposed. Therefore, even when repeatedly locked, it is possible to form a loop that has good bonding strength, delimits the fixing range of the non-thermocompression bonding section fibers, and is thermally fixed at both ends in the non-thermocompression bonding section. Furthermore, since it is composed of a laminated nonwoven fabric with one or more other nonwoven fabrics, it is excellent in the shape retention of the member due to the load at the time of locking, and by making the surface layer at least a long fiber arranged in the longitudinal direction, Efficient use for locking the dominant direction of the fiber arrangement of the surface layer is possible, and it is possible to exhibit sufficient bonding strength as a locking material even with a low basis weight. In addition to the pattern of the thermocompression bonding part, even when slitting into a tape shape, it is possible to provide a locking member that eliminates the opening of the cut surface and the occurrence of fraying.

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) Fluff after locking peeling and form evaluation The fluffing after locking showed the degree of fluffing 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. In addition, the form retention after locking was evaluated by sensory evaluation of the collapsed appearance, and indicated as “stable” and “collapse”.

(3) Tensile strength of surface layer web and non-woven fabric If the surface layer can directly measure the strength of web or non-woven fabric, it cannot be measured as it is with the strength ratio in the machine (longitudinal) and width (transverse) directions, or on the web etc. In such cases, for example, the strength ratio was confirmed by joining the webs by point-like thermocompression bonding. The strength of the web or non-woven fabric is 3 cm wide (arbitrary if the length and width are the same), and a 20 cm long test piece is used with a tensilon manufactured by Shimadzu Corporation, and the grip width is 100 mm (0 cm if necessary), the test speed is 300 mm / min. A tensile test was performed. 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.

[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. The nonwoven fabric which conveyed this web (20g / m < ² >), and joined the web similarly obtained by the dotted | crimped crimping | compression-bonding part (0.45mm diameter, 1.5mm space | interval, zigzag arrangement, crimping area ratio 7%). (30g / m ² ), and a continuous crimping part having a circular (4.5φ) non-crimping area as shown in FIG. A laminated nonwoven fabric having a circular non-thermocompression zone formed between thermocompression bonding portions was obtained by partially joining at 138 ° C. (Example 1). The constituent fiber of the nonwoven fabric of the surface layer was 2.8 dtex, and the basis weight was 20 g / m ² . Similarly, a 4.0 mm square square non-crimping area was arranged in a grid pattern (FIG. 1 (2)), and a non-crimping area of hexagonal (tortoise shell) with a side of 2 cm was arranged in a 60 ° diagonally staggered pattern. (FIG. 1 (3)) The laminated nonwoven fabric was manufactured like Example 1 using the heating roll (Example 2 and Example 3). Table 1 shows the results of the bonding performance between these laminated nonwoven fabrics and hook-shaped locking members.

  The laminated nonwoven fabrics of Examples 1 to 3 have a feeling of fibers, have sufficient binding strength even after repeated use of 5 times of engagement, have less fuzz after engagement in repeated use, and have excellent shape retention. It was a practical laminated nonwoven fabric for locking materials that can withstand deformation force under load.

[Example 4]
In Example 1, the filaments melt-extruded from the irregular V-shaped nozzle were cooled from the side in the vicinity of the spinning nozzle, and the yarn exiting the traction take-up device was given a helical crimp. A non-woven fabric for locking was obtained in the same manner as in Example 1 except that a web of actual crimped yarn having a reduced number of about 10 to 15 pieces / 25 mm and a helical diameter of about 0.8 mm was used. This non-woven fabric was a non-thermocompression-bonded fiber loop having crimps, and was more easily locked and was bulky and excellent in flexibility. The non-reinforcing non-woven fabric as the backing material is one that breaks the non-woven fabric and is easy to break when peeled off after being locked. In Example 4, there is no such problem and the shape retention is excellent. Met.

[Example 5]
In Example 1, a web (component fiber 2.0 dtex, 20 g / m ² ) using a short fiber for nonwoven fabric (fiber length 52 mm) of polyethylene terephthalate fiber was used as a front material, and a backing material was polyethylene terephthalate fiber spunbond (30 g). / M ² , 1 mm pitch 0.5 mm square weave embossed pattern, crimp area ratio 14.5%), and a laminated nonwoven fabric having a basis weight of 50 g / m ² is obtained in the same manner except that the crimp surface temperature is 235 ° C. Obtained. Table 1 shows the results of the coupling performance with the hook-shaped locking member. The obtained non-woven fabric is somewhat stiff, but it is an easy-to-bond locking material with crimps unique to short fibers. In Example 5, the problem was solved and it was sufficiently practical.

[Examples 6 and 7]
In Example 1, the pattern engraved by the heating roll was used except for the heating roll engraved with the Y shape in FIG. 2 (1) and the pattern in which the textured thermocompression bonding section (2) was arranged in the nectar. Similarly, a laminated nonwoven fabric having a basis weight of 50 g / m ² was obtained. These nonwoven fabrics were softer than those fixed at the continuous thermocompression bonding portions, had sufficient bonding strength, and could withstand long fluffing and deformation without being repeatedly locked. Table 1 shows the results of the coupling performance with the hook-shaped locking member.

[Examples 8 and 9]
As Example 8, a crimped long fiber web (20 g / m ² ), which is the surface material of Example 4 in Example 1, is used, and a backing material having a basis weight of 40 g / m ² is used as an overlay. Using a Y-shaped engraved pattern heating roll of FIG. 2 (1) used in Example 6 as a nonwoven fabric, bonding was performed at a thermocompression surface temperature of 135 ° C.

As Example 9, the raw material in Example 1 is nylon 6 resin, the surface material is nylon 6 long fiber web (constituent fiber 2.0 dtex, 20 g / m ² ), and the backing material is nylon 6 fiber spunbond (40 g / m ² ). ^{2 using} a 1 mm pitch 0.5 mm square weave embossed pattern, pressure bonding area ratio 14.5%), and using the Y-shaped engraved pattern heating roll of FIG. 2 (1) used in Example 6, Bonding was performed at a pressure bonding surface temperature of 200 ° C. to obtain laminated nonwoven fabrics each having a basis weight of 60 g / m ² . All of the nonwoven fabrics were excellent in flexibility and easy to be locked, and even when the locking was repeated, there was little fuzz and the shape did not collapse. Table 1 shows the results of the coupling performance with the hook-shaped locking member.

[Examples 10 and 11]
The web collected in Example 1 was engraved with scattered spot-like partial thermocompression bonding parts (0.45 mm diameter, 1.5 mm spacing, staggered arrangement, crimping area ratio 7%) for joining fibers together. Polypropylene spunbond (constituting fiber is 2.8 dtex) that is passed through a heating roll and partially bonded at a pressure surface temperature of 135 ° C is used as the front material at 20 g / m ² and the backing material is 30 g / m ² Each of the laminated nonwoven fabrics for locking materials (Examples 10 and 11) having a basis weight of 50 g / m ² was passed through the heating rolls used in Examples 1 and 2 at a pressure-bonding surface temperature of 135 ° C. and pressed. Obtained. In both nonwoven fabrics, the bond strength after repeated locking of the surface layer was slightly reduced, but there was little fuzz after repeated locking.

[Comparative Example 1]
In Example 10, the basis weight is 50 g / m ² having only spot-like partial thermocompression bonding (0.45 mm diameter, 1.5 mm spacing, zigzag array, crimping area ratio 7%) for bonding fibers, and not laminated. A one-layer nonwoven fabric with the configuration was formed and the locking properties were compared with Example 10. In Comparative Example 1, the non-thermocompression bonding portion was flat and continuous with the swelling of the fiber layer. When this nonwoven fabric was repeatedly bonded to the hook-shaped locking member, the initial strength had a sufficient binding strength, but when repeatedly attached and detached, the fibers on the nonwoven fabric surface were cut by the hook in a single peeling operation, and the nonwoven fabric was Long fibers on the surface fuzzed, and broken fibers were clogged with the hook, and after being locked 5 times, a sufficient bonding strength could not be obtained even after bonding, and it 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, a nonwoven fabric having a weight per unit area of 20 g / m ² was formed without stacking, and the engagement was compared. The locking characteristics of the hook-shaped locking member to the nonwoven fabric of Comparative Example 2 were low in basis weight and rough structure, so that it was easy to lock in the same manner as in Example 1. Collapsed and was not practical. Thereby, it turns out that the form stability after repeated latching is acquired by the reinforcement effect by lamination | stacking with the rough structure of a surface material, and a backing material.

[Comparative Example 3]
The locking direction of the hook-shaped locking member to the laminated nonwoven fabric obtained in Example 1 was evaluated in terms of the binding strength and the like in the machine (vertical) direction instead of the width (horizontal) direction. Although the ease of use was the same, the bond was weak and the bond strength was about 30%. That is, it is clear that the directionality of the fiber arrangement greatly affects the locking characteristics.

The top view which shows an example of the engraving pattern for the locking material of the heating roll used for this invention. The top view which shows an example of the engraving pattern for the locking material 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)

In a laminated nonwoven fabric comprising a surface layer made of a thermoplastic fiber web or a thermoplastic fiber nonwoven fabric and a layer of at least one other thermoplastic fiber nonwoven fabric, the fineness of the fibers constituting the laminated nonwoven fabric is 1 dtex or more and 11 dtex Hereinafter, a lamination for a locking material, wherein the weight per unit area is 150 g / m ² or less, and the surface layer has a non-thermocompression bonding region formed substantially surrounded by a thermocompression bonding part. Non-woven fabric.   The laminated nonwoven fabric for a locking material according to claim 1, wherein the web or the nonwoven fabric of the surface layer includes long fibers that are preferentially arranged so as to cross the locking direction of the web or the nonwoven fabric.   The laminated nonwoven fabric for a locking material according to claim 1 or 2, wherein a length (non-fixed length) of the non-thermocompression bonding region is 7 mm or less.   The laminated non-woven fabric for a locking material according to any one of claims 1 to 3, wherein a shape of the non-thermocompression bonding region is a round shape or a square shape. The laminated nonwoven fabric for a locking material according to any one of claims 1 to 4, wherein an area occupied by one portion of the non-thermocompression bonding region is ² to 100 mm2.   The laminated nonwoven fabric for a locking material according to any one of claims 1 to 5, wherein a width of the thermocompression bonding portion is 0.5 mm or more.   It has a discontinuous partial thermocompression bonding part formed in the pattern different from the thermocompression bonding part which forms the said non-thermocompression bonding area | region, For the locking material in any one of Claim 1 thru | or 6 Laminated nonwoven fabric. The laminated nonwoven fabric for a locking material according to any one of claims 1 to 7, wherein the fibers constituting the laminated nonwoven fabric contain a crimped fiber.

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