JP2003009912A - Non-woven fabric for locking material - Google Patents

Abstract

(57) [Problem] To provide a nonwoven fabric for a locking material in which the bonding strength with respect to a hook-shaped locking member does not decrease even when the operation of bonding and peeling a fastener is repeatedly performed. SOLUTION: A long fiber constituting a web has a crimped portion partially joined by thermocompression bonding, the crimped portion is a substantially continuous parallel linear shape, and a non-woven fabric formed between the crimped portions. A nonwoven fabric for a locking material, comprising a crimping portion.

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 a locking material having a loop that can be repeatedly bonded to a hook-shaped locking 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 woven or knitted fabric having a loop such as a tricot and a hook-shaped locking member may be used.

However, a woven or knitted fabric having loops such as tricots used for these purposes may have fraying or the like when it is cut, which may cause troubles in the manufacturing process. Is required
In addition, there is a problem that the loop side to be coupled needs to have a large area, resulting in high cost. JP-A-2-193607
As disclosed in the publication, the use of a crimped long-fiber nonwoven fabric solves the above-mentioned problems of fraying and cost.

However, in general non-woven fabrics, when the bonding and peeling operations are repeated by re-adhesion, the fibers on the non-woven fabric side are peeled off by hooks and the surface of the non-woven fabric is fluffed. Occurs. The fluffy fibers cover the surface to hide other loop yarns,
Reduces loop performance. Also, the stripped fibers are
It will be stuck in the hook, reducing hooking performance. Therefore, if the bonding and peeling operations are repeated, the fluffy fibers and the fibers clogged in the hooks hinder the bonding, resulting in a problem that the bonding strength as a fastener is lowered.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems and to reduce the bonding strength with respect to the hook-shaped locking member even if the operations of connecting and separating the fastener are repeated. It is to provide a non-woven fabric for a locking material.

[0006]

DISCLOSURE OF THE INVENTION As a result of various studies on surface fasteners, the inventors of the present invention have found that the fastening strength of the fastener is not required in all directions, but rather in repeated use in a specific direction of joining and peeling. It has been found that a bond strength that can withstand is needed. Based on this knowledge,
The present invention has found suitable conditions for a crimping portion by fixing fibers in a non-woven fabric surface in parallel lines preferentially in a direction requiring bond strength, and combining them so as to intersect the fiber arrangement direction. Came to make.

That is, the present invention is as follows. 1. The long fibers constituting the web have a crimping portion partially joined by thermocompression bonding, the crimping portion is substantially continuous parallel line shape, and has a non-pressurizing portion formed between the crimping portions. A non-woven fabric for a locking material, which is characterized in that 2. 2. The non-woven fabric for a locking material according to the above 1, wherein the substantially continuous parallel-line pressure-bonded portions are formed so as to cross at least the fiber arrangement predominant direction of the non-woven fabric surface layer.

3. The strong aspect ratio of the nonwoven fabric is 2.0 to 8.
The non-woven fabric for a locking material according to 1 or 2 above, which is 0. 4. The non-woven fabric for a locking material according to the above 1, 2 or 3, wherein the long fibers forming the web are crimped fibers. 5. The width of the non-crimped portion is at least 2 to 5 mm, and the non-woven fabric for a locking material according to 1 above.

6. The above-mentioned 1 characterized in that the width of the substantially continuous parallel line-shaped crimping portion is 0.3 to 1.5 mm.
Nonwoven fabric for the locking material described. 7. 2. The non-woven fabric for a locking material according to the above 1, wherein the substantially continuous parallel-line crimped portions are formed by thermocompression bonding at least in the surface layer of the non-woven fabric. In the present invention, the hook-shaped locking member is a member of a general fastener in which hook-shaped or protrusion-shaped members are arranged, which can hook fibers of the nonwoven fabric for the locking material.

The present invention will be described in detail below. In the present invention, it is preferable that the substantially continuous parallel-line pressure-bonded portions are formed at least across the fiber arrangement dominant direction of the nonwoven fabric surface layer. Further, the bonding for holding the strength of the non-woven fabric can be performed by hot air bonding or hydroentanglement in addition to thermocompression bonding, and a substantially continuous parallel linear crimping portion is formed on at least the surface layer of the non-woven fabric. Is preferred.

The predominant direction of fiber arrangement is a direction in which there are many directions of fiber arrangement on the surface of the non-woven fabric, and it can be expressed as a strong aspect ratio of the non-woven fabric as an index showing the fiber arrangement direction. The aspect ratio is preferably 2.0 to 8.0, more preferably 2.5 to 6.0. Strong aspect ratio is 2.0
If the above is the case, the fibers are aligned well in the longitudinal direction, and as a whole, the fibers forming the loops are arranged without being disturbed, so the binding is effective and sufficient hooking is achieved, and a high bond is obtained. You can get powerful. Furthermore, since the fixed lengths of the fibers in the loop are uniform and act like a plurality of aligned yarns, the single yarns are less likely to break when the hook is peeled off, and a high bond with the hook-shaped locking member is achieved. You can get powerful. 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.

The fibers constituting the nonwoven fabric of the present invention are
From the viewpoint of strength and the like, long fibers are preferable, and crimped fibers are preferable from the viewpoint of easy formation of loops. In the present invention, the substantially continuous parallel linear crimping portion may be linear crimping, but when peeling the hook-shaped locking member that is joined, the fibers are not continuously stripped and long Since it suffices to fix the above, as long as such an effect can be obtained, a series of dot-like or wire-like crimping portions may be used. When flexibility is required depending on the purpose of use and attachment site, it is preferable to use crimped parts that are connected in a dotted shape or a broken shape and have a substantially continuous parallel line shape, in order to prevent continuous fiber separation. The gap between the pressure-bonded portions is preferably 0.3 mm or less at most, and more preferably 0.1 mm or less.

The width of the substantially continuous parallel line crimping portion is preferably at least 0.3 to 1.5 mm, and 0.5
˜1.0 mm is more preferable. If the width of the parallel line-shaped crimping portion is within this range, the flexibility of the nonwoven fabric is good, and sufficient crimping is performed, and when the hook-shaped locking member is peeled off, the fibers break and fluff. Since the non-woven fabric of the locking material is peeled off without being covered with fluffy fibers, the bondability does not deteriorate even if the bonding and peeling are repeated.

The parallel-line pressure-bonded portion can be formed by thermo-compression bonding, for example, a method using an engraved roll, a method of pressing a flat plate, or the like, but in view of production efficiency, the roll is used. Is preferred. The method using the roll is a combination of one roll being an engraving roll and the other roll being a smooth metal roll, and also,
As the lower engraving roll, there is a method of butting. The degree of thermocompression bonding is determined by setting the temperature of the upper and lower rolls, contact pressure, etc. according to the required performance such as strength of the resulting nonwoven fabric or fuzzing property. Is preferably set below the melting point of the fiber used.

In the present invention, the non-crimp portion means a non-crimp portion between the crimp portion formed by parallel-line crimping and the adjacent crimp portion, and fibers in the non-crimp portion are joined to each other. Without forming a loop between the crimped parts. The width of the non-pressure-bonded portion is preferably at least 2 to 5 mm, more preferably 3 to 4 mm. When the width of the non-crimping portion is within the above range, the loop in the non-crimping portion is appropriate, and the hook-shaped locking member is sufficiently caught, so that high bonding strength can be obtained. When peeled off, the fibers are peeled off without fluffing, so the surface of the locking material non-woven fabric is not covered with fluffy fibers, and as a result, the bondability decreases even after repeated bonding and peeling. Never.

In the present invention, the fibers used are:
In terms of formation of the pressure-bonded portion, strength, etc., thermoplastic fibers, particularly crystalline thermoplastic fibers are preferable, for example, polyolefin fibers such as polypropylene fibers that are lightweight and have a relatively low melting point and are easy to pressure-bond, and high single yarn strength. Examples thereof include polyester fibers such as polyethylene terephthalate fibers having good dimensional stability, and polyamide fibers such as nylon 6 or nylon 66 having high single yarn strength and good cloth flexibility, either alone or in combination. Further, although these fibers can be used as the composite fibers, fibers composed of a single component are more preferable from the viewpoint of cost and recyclability.

Further, in order to cover the yarn breakage at the time of peeling from the hook-shaped locking member, it is preferable that the nonwoven fabric is composed of a long fiber web having a high single yarn strength. In the present invention, the fineness of the long fibers constituting the nonwoven fabric is 0.5 to 1
1.0 dtex is preferable, and more preferably 1.0 to
It is 5.0 dtex. When the fineness is in this range, the single yarn is hard to be broken, a high bonding strength with the hook-shaped locking member can be obtained, and a nonwoven fabric for a locking material having a soft texture can be obtained.

In the present invention, it is preferable to use a crimped fiber as the fiber 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 crimp is preferably 0.3 to 1.0 mm. When the crimped helix diameter is in this range, the number of crimps per unit length is appropriate and the space obtained by the helix shape is large, so that the bulkiness is excellent and the effect of the crimped fiber is effectively exhibited.

The cross-sectional shape of the fiber is an ordinary round shape, and
It may be formed into a special shape by deforming this. The crimped fiber with 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 may be a shape having a convex portion or a concave portion in at least a part of the cross section. Also, crimped fiber with a single component,
It may be one physically formed by an asymmetric cooling method or the like in which the yarn is nonuniformly cooled at the time of fiber production, or may be a fiber crimped by a bimetal effect using the composite fiber method.

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

[0021]

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, the evaluation method and the like are as follows. (1) Bonding strength A hook-shaped locking member having a width of 3 cm provided with about 400 mushroom-shaped hooks having a height of about 0.5 mm per cm ² and a nonwoven fabric (width of 3 cm) prepared in Examples or Comparative Examples were prepared. 3c
It was weight-bonded with a 700-g roller having a length of m.

Using Tensilon manufactured by Shimadzu Corporation,
Grab the top and bottom of the unjoined parts, grip width 100m
m, a tensile test was performed at a test speed of 300 mm / min, the maximum strength was read, and the value obtained by dividing the maximum strength by the area of the bonding portion was taken as the bonding strength (N / cm ² ). Tests were conducted by further binding. (2) A strong piece of non-woven fabric with a width of 3 cm and a length of 20 cm was tested by Shimadzu Corporation.
Using Tensilon manufactured, a tensile test was performed at a grip width of 100 mm and a test speed of 300 mm / min. The strength was measured with the longitudinal direction of the fiber arrangement of the nonwoven fabric as the longitudinal direction and the transverse direction as the direction of 90 degrees, and the value obtained by dividing the strength value in the longitudinal direction by the strength value in the lateral direction was taken as the aspect ratio of the strength.

(3) Nonwoven fabric thickness A peacock thickness measuring instrument was used to measure with a load of 100 g / cm ² . Example 1 Polypropylene (MFR = 40 measured under condition 14 of Table 1 of JIS-K7210) was used as a raw material, and long fibers melt-extruded from a nozzle having a round cross section were cooled from the side in the vicinity of the spinneret. It was picked up by a towing and picking device such as an air soccer. The yarn exiting from the towing and take-up device was passed through a charging device to be opened, and then collected as a web on a moving wire mesh conveyor. Next, this web is conveyed, passed through a heating roll having a linear pressure-bonded portion engraved, the webs are partially bonded to form a pressure-bonded portion, and a nonwoven fabric having a non-pressure-bonded portion formed between the pressure-bonded portions is formed. Obtained.

The resulting non-woven fabric had a constituent fiber of 2.8 decitex, a basis weight of 40 g / m ² , a linear crimp portion width of 1.0 mm and a non-crimp portion width of 4.0 mm. It was When the obtained non-woven fabric was used as a loop locking material and bonded to a hook-shaped locking member, it had sufficient bonding strength. Further, the bonding / peeling of the non-woven fabric for the locking material and the hook-shaped locking member was repeated. When the loop yarn in the non-crimping portion is tensioned by the hook at the time of peeling, the loop yarns whose both ends are fixed by the linear crimping are cut in the non-crimping portion. There was little fuzz on the surface, and the loop was not hidden.
In addition, it can be said 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 it was repeated 10 times, the same binding strength was maintained.

The results are shown in Table 1. Example 2 Polypropylene (MFR = 40 measured under condition 14 of Table 1 of JIS-K7210) was used as a raw material, and long fibers melt-extruded from a deformed nozzle were laterally cooled in the vicinity of the spinneret and pulled. It was collected by a collecting device. This yarn had a spiral crimp. A non-woven fabric was obtained in the same manner as in Example 1 except that the yarn that exited the towing and take-up device was used.

The resulting nonwoven fabric had the same binding performance with the hook-shaped locking member as in Example 1. The results are shown in Table 1. [Example 3] Constituent fiber 2.0d in the same manner as in Example 1 except that nylon 6 was used instead of polypropylene.
A non-woven fabric having a tex and a basis weight of 40 g / m ² was obtained.

The resulting nonwoven fabric had the same binding performance as the hook-shaped locking member 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,
A nonwoven fabric having a constituent fiber of 2.0 decitex and a basis weight of 40 g / m ² was obtained.

The resulting non-woven fabric had the same binding performance with the hook-shaped locking member as in Example 1. The results are shown in Table 1. [Embodiment 5] Except that the width of the non-crimp portion is 1 mm,
A nonwoven fabric was obtained in the same manner as in Example 1.

When the obtained non-woven fabric was combined with the hook-shaped locking member, the loop in the non-pressure-bonded portion was small, so that the hook-shaped locking member was not caught and the bonding strength was slightly lowered from the initial stage. The repeatability was slightly lower than in Example 1. The results are shown in Table 1. [Embodiment 6] In Embodiment 1, the width of the linear crimp portion is set to 0.
A nonwoven fabric was obtained in the same manner as in Example 1 except that the thickness was 2 mm.

When the obtained non-woven fabric was bonded to the hook-shaped locking member, it had a sufficient bonding strength at the initial stage, but when the bonding and peeling were performed, the fibers on the surface of the non-woven fabric were gradually hooked by the hook at the crimped portion. The non-woven fabrics were continuously peeled off, and the surface of the non-woven fabric was covered with long fluffy fibers, which made it unusable after 10 repetitions. The results are shown in Table 1.

[Embodiment 7] The same as Embodiment 1 except that the yarn is opened so that the difference in the fiber arrangement in the lengthwise direction and the widthwise direction in the web formation is reduced, and the strong aspect ratio of the cloth is set to 1.8. A non-woven fabric was obtained. When the obtained non-woven fabric was bonded to the hook-shaped locking member, the loop yarn was less likely to be caught on the hook, and the bonding strength with the hook-shaped locking member was slightly reduced.
It became unusable after repeated use. The results are shown in Table 1.

[Example 8] The same as Example 1 except that the yarn was opened so that the difference in the fiber arrangement in the lengthwise and widthwise directions during the web formation was large, and the strong aspect ratio of the cloth was 8.5. A non-woven fabric was obtained. When the obtained non-woven fabric was bonded to the hook-shaped locking member, it had a sufficient bonding strength in the initial stage, but the lateral strength of the non-woven fabric was rather low, and when bonding / peeling was performed, the fibers on the surface of the non-woven fabric were gradually torn. It was peeled off so that it could not be used after 10 repetitions. The results are shown in Table 1.

[Comparative Example 1] In Example 1, the fibers were joined to each other by dot-shaped partial thermocompression bonding (0.45 mm diameter, 1.5 m).
m interval, zigzag arrangement), and the non-woven fabric was formed without processing the linear crimped portion. The non-pressed portion had a bulge but was continuous. When this non-woven fabric was combined with a hook-shaped locking member, it had a sufficient bond strength at the beginning,
When bonding and peeling are performed, the fibers on the non-woven fabric surface are peeled off by the hook with one peeling, the surface of the non-woven fabric is covered with long fluffy fibers, and the broken long fibers are clogged in the hook and then bonded. However, sufficient bond strength could not be obtained, and it could not withstand repeated use of 5 times. The results are shown in Table 1.

[0034]

[Table 1]

[0035]

EFFECTS OF THE INVENTION The nonwoven fabric for a locking material of the present invention is useful as a locking material for a fastener and has a non-crimp portion formed between parallel continuous crimp portions. Therefore, it is possible to form a loop whose both ends are fixed in the non-crimp portion. By hooking the hook of the hook-shaped locking member on this loop, sufficient binding strength as a locking material is exhibited, and when peeling from the hook-shaped locking member, the crimping part around the loop is peeled off. By breaking the fluff on the surface due to the fibers to be formed, the fluff on the surface is reduced, the cut fibers are less likely to be clogged in the hook, and the bond strength is not deteriorated even if the bonding and peeling are repeated.

Further, when flexibility is required in the attachment site for the purpose of use, it is possible to obtain flexibility by providing a substantially continuous linear crimp portion having a dot shape or a broken wire shape.

Continued front page    F-term (reference) 3B100 DA01                 4L047 AA14 AB03 BA08 CB01 CC14                       EA10

Claims (7)

[Claims] 1. A long fiber constituting a web has a crimping part partially joined by thermocompression bonding, the crimping part being a substantially continuous parallel line shape, and formed between the crimping parts. A non-woven fabric for a locking material, which has a non-crimped portion. 2. A substantially continuous parallel line-shaped crimping portion,
The non-woven fabric for a locking material according to claim 1, wherein the non-woven fabric is formed so as to cross at least the fiber arrangement dominant direction of the non-woven fabric surface layer. 3. A nonwoven fabric having a strong aspect ratio of 2.0 to 8.0.
The non-woven fabric for a locking material according to claim 1 or 2, wherein 4. The non-woven fabric for a locking material according to claim 1, 2 or 3, wherein the long fibers forming the web are crimped fibers. 5. The non-woven fabric for a locking material according to claim 1, wherein the non-crimped portion has a width of at least 2 to 5 mm. 6. The width of the substantially continuous parallel line-shaped crimping portion is 0.3 to 1.5 mm.
Nonwoven fabric for the locking material described. 7. A substantially continuous parallel line crimping portion,
The nonwoven fabric for a locking material according to claim 1, wherein at least the surface layer of the nonwoven fabric is formed by thermocompression bonding.