JP2001000212A - Hook-and-loop fastener male material and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hook-and-loop fastener male material which has excellent engaging strength, flexibility and good grade. SOLUTION: A long fiber nonwoven fabric A consisting of synthetic fibers and a thermally fusible composite fiber nonwoven fabric B having a core/sheath structure are three-dimensionally intertwined with each other, by which many loops consisting of the component fibers of the long fiber nonwoven fabric A are formed on the front surface of the thermally fusible composite fiber nonwoven fabric B having the core/sheath structure. The area rate of the discontinuously melted and densely formed portions is specified to 2 to 30%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a female hook-and-loop fastener used for living materials, civil engineering materials, and the like, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, hook-and-loop fasteners have been used in various fields including convenience materials such as clothes, shoes, curtains, diapers and other living materials, ground improvement and other civil engineering materials, and simple packaging and other industrial materials. Has been utilized. A hook-and-loop fastener is basically composed of a hook (male material) and a loop (female material), and the shapes and materials of the male material and the female material have been devised according to the intended use and conditions.

In recent years, in particular, nonwoven fabrics have been used as female materials. 0.2 to depth on the surface of long fiber non-woven fabric
An example is provided in which 2 to 40 3 mm wrinkles are provided per 1 cm (JP-A-6-33359). However, since the surface fastener female member is merely a grooved surface of the long fiber, the engagement strength, the durability, and the pull-out resistance are small. In the field of disposable materials, there is also a material using a single-fiber nonwoven fabric alone. However, the strength of the loop and the pull-out resistance are weak, and thus it is not suitable for applications repeatedly used. In order to improve these drawbacks, there have been devised such as thickening the fiber, hardening with an adhesive or low-melting fiber, but both have a hard texture,
There was a problem that usable applications were limited. In addition, a continuous seal portion is formed on a web mainly composed of heat-fusible conjugate fibers,
It is introduced that a nonwoven fabric having one surface densified by heat fusion is used as a female material of a hook-and-loop fastener (Japanese Unexamined Patent Application Publication No. Hei 9 (1999)).
-317 publication). However, in this case, although the repeated engagement strength is maintained, since the seal portion is continuous,
There have been problems such as irregular wrinkles and the like, resulting in deterioration in quality and mechanical properties such as tensile strength and tear strength. Furthermore, after a three-dimensional entanglement between a long fiber web and a long fiber web for thermal bonding, it is introduced that the entangled constituent fibers are partially thermally bonded to each other (Japanese Patent Laid-Open No. 9-1).
No. 58025). However, in this case, the partial thermal bonding is due to the point bonding between the constituent fibers, and the thermally bonded portion is not melt-densified, so that the durability of the engagement strength and the fluffing are insufficient. In addition, there is a problem that a problem remains in flexibility due to lamination of long fibers.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks, and has excellent repetitive engagement strength, excellent flexibility, less fluff and wrinkles, and high quality clothing and disposable diapers. Living materials, civil engineering materials for ground improvement, etc.
An object of the present invention is to provide a female hook-and-loop fastener material suitably used for industrial materials for simple packaging and the like, and a method for producing the same.

[0005]

That is, the present invention provides a long-fiber nonwoven fabric A composed of synthetic fibers and a heat-fusible composite short-fiber nonwoven fabric B having a core / sheath structure, which are three-dimensionally entangled with each other.
A large number of loops composed of constituent fibers of the long-fiber nonwoven fabric A are formed on the surface of the heat-fusible composite short-fiber nonwoven fabric B having a core / sheath structure, and the area ratio of the discontinuous melt-densified portion is 2 to 2.
It is a hook-and-loop fastener female material characterized by being 30%.

In addition, the present invention provides a method of laminating a long-fiber non-woven fabric A made of synthetic fiber and a heat-fusible composite short-fiber non-woven fabric B having a core / sheath structure, followed by needle punching from the long-fiber non-woven fabric A side. Heat-fusible composite short fiber nonwoven fabric B having a sheath structure
After forming a large number of loops made of the constituent fibers of the long-fiber nonwoven fabric A on the surface of the laminate, the laminated body is melt-densified in a discontinuous pattern and the loops are fixed, thereby manufacturing the female fastener material. Is the way.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the female fastener material of the present invention, the melting point of the long-fiber nonwoven fabric A having a basis weight of 30 to 300 g / m ² and the melting point of the sheath component are higher than the melting points of the synthetic fibers constituting the long-fiber nonwoven fabric A by 60. The heat-fusible composite short-fiber nonwoven fabric B having a core / sheath structure whose core weight is 30 to 70% of that of the long-fiber nonwoven fabric A is three-dimensionally entangled with each other to form a core / sheath structure. A large number of loops composed of the constituent fibers of the long-fiber nonwoven fabric A are 10 to 100 on the surface of the fusible composite short-fiber nonwoven fabric B.
/ cm ² , the height of the loop is in the range of 0.3 to 7 mm, the thickness of the synthetic fiber constituting the long-fiber nonwoven fabric A is in the range of 1 to 20 denier, discontinuous melting. In a preferred embodiment, the area ratio of the densified portion is 2 to 30%.

The female surface fastener material of the present invention is obtained by laminating a long-fiber nonwoven fabric A made of synthetic fiber and a heat-fusible composite short-fiber nonwoven fabric B having a core / sheath structure, and performing needle punching from the long-fiber nonwoven fabric A side. After a large number of loops composed of the constituent fibers of the long-fiber nonwoven fabric A are formed on the surface of the heat-fusible composite short-fiber nonwoven fabric B having a core / sheath structure, the laminate is melt-densified in a discontinuous pattern. Although the loop is fixed, as a synthetic fiber material constituting the long-fiber nonwoven fabric A, a polyester fiber such as polyethylene terephthalate or polybutylene terephthalate, a copolyester fiber containing isophthalic acid, or another copolyester fiber is used. Polymerized polyester fiber, or fiber composed of a modified material such as polyethylene terephthalate, or aliphatic or aromatic polyamide fiber, Others, such as olefin-based fibers, and the like. Among these fibers, those having as high a strength as possible are preferred from the viewpoint of engagement strength.

The basis weight of the long-fiber nonwoven fabric in the present invention is 30.
~300g / m ² is preferred. If it is less than 30 g / m2, the amount of fibers tends to decrease and the engagement strength tends to decrease. Also,
If it exceeds 300 g / m ² , it tends to be hard and the mold familiarity with the unevenness tends to be poor.

[0010] The long-fiber nonwoven fabric A of the present invention has excellent tensile strength and tearing strength since a large number of loops are formed of filaments.
The engagement strength is improved.

The melting point of the sheath component of the heat-fusible composite short fiber nonwoven fabric B having a core / sheath structure in the present invention is a long fiber nonwoven fabric A
Is preferably 60 ° C. or more lower than the melting point of the synthetic fiber constituting the above. When the melting point of the sheath component of the heat-fusible composite short fiber nonwoven fabric B having a core / sheath structure is less than 60 ° C., the long-fiber nonwoven fabric A and the heat-fusible composite short fiber nonwoven fabric B having a core / sheath structure are laminated. Thereafter, needle punching is performed from the long fiber nonwoven fabric A side,
After a large number of loops composed of the constituent fibers of the long-fiber nonwoven fabric A are formed on the surface of the heat-fusible composite short-fiber nonwoven fabric B having a core / sheath structure, the laminate is melt-densified in a discontinuous pattern, When fixing the loops, it is necessary to strict processing conditions in order to perform satisfactory melting and densification, whereby a large number of loops composed of the constituent fibers of the long-fiber nonwoven fabric A cannot be held in an appropriate form, and It is not preferable because it lowers the joint strength and hardens the texture.

The heat-fusible composite short fiber nonwoven fabric B having a core / sheath structure in the present invention preferably has a basis weight of 30 to 70% of the basis weight of the long fiber nonwoven fabric A. The heat-fusible composite short fiber nonwoven fabric B having a core / sheath structure has a long fiber nonwoven fabric A weight.
If the basis weight is less than 30%, after laminating the long-fiber nonwoven fabric A and the heat-fusible composite short-fiber nonwoven fabric B having a core / sheath structure, needle punching is performed from the long-fiber nonwoven fabric A side to form the core / sheath structure. After forming a large number of loops composed of the constituent fibers of the long-fiber nonwoven fabric A on the surface of the heat-fusible composite short-fiber nonwoven fabric B, the laminate is melt-densified in a discontinuous pattern to fix the loops. In such a case, the melt densification becomes insufficient, and the repetitive engagement strength decreases and fuzzing increases, which is not preferable. If the basis weight exceeds 70% of the basis weight of the long-fiber nonwoven fabric A, when the laminate is melt-densified in a discontinuous pattern to fix the loop, the degree of melt-densification becomes too large to engage. The strength decreases, which is not preferable.

In the present invention, the long-fiber nonwoven fabric A composed of synthetic fibers and the heat-fusible composite short-fiber nonwoven fabric B having a core / sheath structure are three-dimensionally entangled with each other to form a heat-fusible composite having a core / sheath structure. On the surface of the short-fiber nonwoven fabric B, there are a large number of loops made of the constituent fibers of the long-fiber nonwoven fabric A. The number of loops is 1
Preferably, it is present in an amount of 0 to 100 / cm2. When the number of loops is less than 10 / cm ² , the engagement strength of the female member of the hook-and-loop fastener tends to decrease, and when it exceeds 100 / cm ² , the strength of the hook-and-loop fastener obtained in the present invention tends to decrease. Is not preferred.

In the present invention, the long-fiber nonwoven fabric A composed of synthetic fibers and the heat-fusible composite short-fiber nonwoven fabric B having a core / sheath structure are three-dimensionally entangled with each other to form a heat-fusible composite having a core / sheath structure. A large number of loops made of the constituent fibers of the long-fiber nonwoven fabric A are formed on the surface of the short-fiber nonwoven fabric B, and these loops are engaged with the male hooks as the female material. Must be firmly fixed to the base. For that purpose, it is necessary to melt-densify at least a part of the long-fiber nonwoven fabric in a discontinuous pattern, and the area ratio (melt-densified area / melt-densified area / The total area of the long-fiber nonwoven fabric) × 100 (%) is 2 to 30%, and the area ratio is preferably 5 to 25%. If the melt densification by the discontinuous pattern is too large or too small with respect to the long-fiber nonwoven fabric, the intended product cannot be obtained. When the area ratio of the melt densification is less than 2%, after engaging with the male surface fastener, the fibers of the female nonwoven fabric, which is the female material of the surface fastener, adhere to the surface of the male male fastener when peeled off. Since the surface of the nonwoven fabric is fluffed and the strength is reduced, the engagement strength is sharply reduced, and the nonwoven fabric cannot be used repeatedly. On the other hand, if it exceeds 30%, the loop of the long fiber non-woven fabric, which is the female material of the hook-and-loop fastener, is strongly fixed while lying down, and the surface of the long-fiber non-woven fabric becomes hard, so that the male material of the hook-and-loop fastener hardly penetrates the female material of the hook-and-loop fastener. , The engagement strength is significantly reduced. Further, when the pattern of the melt densification is made continuous, a difference in shrinkage between the melt densified portion and the portion not melt-densified at the time of melt densification occurs, which causes irregular wrinkles and the like. As the quality decreases and the melt densification pattern becomes continuous, mechanical properties such as tensile strength and tear strength also decrease.

In the present invention, the long-fiber nonwoven fabric A composed of synthetic fibers and the heat-fusible composite short-fiber nonwoven fabric B having a core / sheath structure are three-dimensionally entangled with each other to form a heat-fusible composite having a core / sheath structure. The number of loops composed of the constituent fibers of the long-fiber nonwoven fabric A on the surface of the short-fiber nonwoven fabric B is preferably 0.3 to 7 mm in height. If the height is less than 0.3 mm, the engagement strength tends to be insufficient, and if it exceeds 7 mm, the loop itself is easily broken, and the strength of the hook-and-loop fastener obtained by the present invention is reduced and the engagement strength is insufficient. Tend.

In the present invention, the filament thickness of the synthetic fiber constituting the long-fiber nonwoven fabric A is preferably in the range of 1 to 20 denier. When the denier is less than 1 denier, the strength of the single yarn is insufficient, and the strength of the loop is apt to be reduced. On the other hand, if it exceeds 20 denier, the fibers are less likely to be entangled during needle punching, the strength of the entire nonwoven fabric cannot be sufficiently obtained, the number of loops is reduced, and the engagement strength tends to decrease. In addition, a tingling sensation at the time of wearing is enhanced, and the use is limited.

Next, the manufacturing method of the present invention will be described. In the production method of the present invention, after laminating a long-fiber nonwoven fabric A made of synthetic fiber and a heat-fusible composite short-fiber nonwoven fabric B having a core / sheath structure, needle punching is performed from the long-fiber nonwoven fabric A side to obtain a core / sheath structure. After forming a large number of loops composed of the constituent fibers of the long-fiber nonwoven fabric A on the surface of the heat-fusible composite short-fiber nonwoven fabric B having the following, the laminate is melt-densified in a discontinuous pattern to fix the loops. Things.

In the present invention, the loop is preferably formed by a needle punch. This is because the size and shape of the loop can be stably obtained by needle punching.

As for the conditions of the needle punch, the felting needle is suitably in the range of needle numbers 30 to 42. If the needle count exceeds 43, the needles are likely to break during processing, which lowers productivity, and the possibility that broken needles are mixed into the long-fiber nonwoven fabric increases, which is not preferable from the viewpoint of safety. Needle count is 3
If it is less than 0, friction with the fiber during processing increases,
As a result, the fibers are easily cut, and the tensile strength of the surface fastener obtained in the present invention tends to decrease.

After laminating a long-fiber nonwoven fabric A made of synthetic fiber and a heat-fusible composite short-fiber nonwoven fabric B having a core / sheath structure, needle punching is performed from the long-fiber nonwoven fabric A side to obtain a heat-fusible composite short-fiber nonwoven fabric. After forming a large number of loops composed of the constituent fibers of the long-fiber nonwoven fabric A on the surface of the adhesive composite short-fiber nonwoven fabric B, as a method of melting and densifying in a discontinuous pattern,
Examples of the method include ultrasonic fusion bonding to at least one engraving roll and thermocompression bonding at a temperature equal to or higher than the melting point of the sheath component of the heat-fusible composite short fiber nonwoven fabric B having a core / sheath structure.

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited thereto. The measuring method used in the present invention is as follows.

(A) Engagement strength of female material of hook-and-loop fastener (N / 5c
(m width) It measured according to 6.4.2 peeling strength of JIS-L3416-1994. Initial engagement strength (N
/ 5cm width), repeated engagement strength after 8 times desorption (N / 5cm width)
Was measured. As for the method of superposing and attaching the surface fastener, the superposing length L of a sample having a width of 5 cm was set to 5 cm, the maximum shear load (N) was obtained, and the result was indicated as the engaging strength (N / 5 cm width). The data was expressed as an average value of five test pieces. Others were according to the method described in JIS.

(B) Flexibility (mm) JIS-L-1906 4.7.1 (cantilever method)
The bristles were measured according to the following. 180 mm or less was accepted.

(C) Surface Quality The state of the surface was visually checked, and those of good quality without wrinkles or the like were evaluated as ○, and those of poor quality were evaluated as ×.

(D) Loop Height (mm) The depth of the first barb of the felting needle that passed through the bed plate set during needle punching was measured as the loop height.

(E) Number of loops (pieces / cm ² ) The number of felting needles set during needle punching was measured as the number of loops.

(F) Comprehensive evaluation: は indicates particularly excellent in terms of engagement strength, flexibility and quality, ○ indicates excellent, △ indicates normal, and × indicates inferior.

Examples, Comparative Examples and Conventional Examples Polyethylene terephthalate having a solid melt viscosity of 0.65 was melt-spun and then drawn and thinned by air soccer to form filaments, which were randomly deposited and collected on a net conveyor. Thereafter, the filament was lightly pressed with an embossing roll to obtain a long-fiber nonwoven fabric A comprising a filament having a thickness of 3.0 denier. On the other hand, the heat-fusible composite short-fiber nonwoven fabric B having a core / sheath structure has a core / sheath structure having a core / sheath structure of 2 denier and 51 mm cut length having polyethylene terephthalate as a core and modified polyester having a melting point of 110 ° C. as a sheath. The composite staple fibers (EE7 manufactured by Toyobo Co., Ltd.) were obtained by forming a spread web and then thermocompression bonding.
After laminating the obtained long-fiber non-woven fabric A and the heat-fusible composite short-fiber non-woven fabric B having a core / sheath structure, needle punching is performed from the long-fiber non-woven fabric A side using various felting needles. The heat-fusible composite short fiber nonwoven fabric B having a sheath structure was penetrated, and a loop was formed on the other surface. Thereafter, the obtained laminated nonwoven fabric was attached to various engraving rolls, and discontinuous melt densification was performed by thermocompression bonding (temperature: 170 ° C., linear pressure: 40 kg / cm). In Example 6, discontinuous melt densification was performed by ultrasonic fusion (under the conditions of a frequency of 20 kHz and an amplitude of 40 μ) instead of thermocompression bonding. The evaluation of the engagement strength was performed using a mushroom-shaped hook (Majiloc S5002 manufactured by Kuraray Co., Ltd.) as a male material. The results are shown in Tables 1 to 3.

Table 3 shows a conventional long-fiber nonwoven fabric obtained by embossing one surface (conventional example 1) and a short-fiber nonwoven fabric obtained by needle punching and embossing (conventional example 2). .

[0029]

[Table 1]

[0030]

[Table 2]

[0031]

[Table 3]

From Example 1 and Comparative Examples 1 and 2, the long-fiber nonwoven fabric A has an engaging strength in the range of 30 to 300 g / m ² ,
It can be seen that the flexibility and the surface quality are excellent. Examples 1 and 2 and Comparative Examples 3 and 4 show that when the thickness of the synthetic fiber is in the range of 1 to 20 denier, the engagement strength, flexibility, and surface quality are excellent. It can be seen from Example 3 and Comparative Examples 5 and 6 that when the felting needle count is in the range of 30 to 42, the engagement strength, flexibility and surface quality are excellent. Example 4
And 5, from Comparative Examples 7 and 8, the loop height was 0.3 to
It can be seen that when the thickness is within the range of 7 mm, the engagement strength, flexibility, and surface quality are excellent. Further, Example 1, Comparative Examples 9 and 1
From 0, it can be seen that when the number of loops is 10 to 100 / cm ² , the engagement strength, flexibility, and surface quality are excellent. In addition, from Example 1 and Comparative Examples 11 to 13, when the discontinuous melt-densified portion has an area ratio of 2 to 30%, the engagement strength, flexibility, and surface quality are excellent, and each characteristic is obtained. It can be seen that the balance is maintained. Conventional examples 1 and 2
It can be seen that the engagement strength is not sufficient.

[0033]

Industrial Applicability According to the present invention, the quality of clothes, disposable diapers, etc., living materials such as disposable diapers, which are excellent in initial and repeated engagement strength, excellent in flexibility, less fuzzy and wrinkled, and ground improvement. It is possible to stably obtain a hook-and-loop fastener female material suitably used for earthwood for use, industrial materials for simple packaging, and the like.

Claims (4)

[Claims] 1. A long-fiber nonwoven fabric A made of synthetic fiber and a core /
The heat-fusible composite short-fiber nonwoven fabric B having a sheath structure is three-dimensionally entangled with each other, and a large number of constituent fibers of the long-fiber nonwoven fabric A are formed on the surface of the heat-fusible composite short-fiber nonwoven fabric B having a core / sheath structure. Wherein the area ratio of the discontinuous melt-densified portion is 2 to 30%. 2. The heat-fusible composite short-fiber nonwoven fabric B having a core / sheath structure has a basis weight of 30 to 70% of the basis weight of the long-fiber nonwoven fabric A.
The hook-and-loop fastener female material according to claim 1, wherein 3. The surface according to claim 1, wherein there are 10 to 100 loops / cm ^{2 of} fibers constituting the long-fiber nonwoven fabric A on the surface of the heat-fusible composite short-fiber nonwoven fabric B having a core / sheath structure. Zipper female material. 4. A long-fiber nonwoven fabric A made of synthetic fiber and a core /
After laminating the heat-fusible composite short fiber nonwoven fabric B having a sheath structure,
Needle punching is performed from the long-fiber nonwoven fabric A side to form a large number of loops made of the constituent fibers of the long-fiber nonwoven fabric A on the surface of the heat-fusible composite short-fiber nonwoven fabric B having a core / sheath structure. Wherein the loop is fixed by melting and densifying the loop in a discontinuous pattern.