JP3219237B2 - Non-woven - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonwoven fabric which has a good texture and good productivity and is useful as a concave material of a mechanical fastener.

[0002]

2. Description of the Related Art In recent years,
Various absorbent articles such as disposable diapers having a mechanical fastener as a fastening tape have been proposed and used. The mechanical fastener is intended to releasably adhere by bringing a so-called convex member and a concave material into contact with each other.
Normally, as shown in FIG. 9, a sheet for a concave material in which a loop 103 for hooking the engaging portion 10 of the convex member is formed by partially bonding a laminate of the fiber knit 101 and the film sheet 102 is used. Have been. However, since such a sheet for concave portions is a knitted material, there are problems such as poor shape retention and easy occurrence of neck-in in a processing step. Further, Japanese Patent Application Laid-Open No. 7-313213 proposes using a sheet using a needle punch for a concave material, but has a problem that the sheet is inferior in productivity and more expensive. .

Therefore, it has been proposed to use a nonwoven fabric having a good texture as the concave material.
As shown in FIG. 10, there is a problem that the bonding portion 112 of each fiber 111 is detached due to the force applied by the engaging portion 10 and does not exhibit a sufficient peeling force strength as a concave material. In addition, when the bonded male member is once peeled off, there is a problem that fluffing occurs and it becomes difficult to reuse the male member. It has also been proposed to increase the fiber density to increase the peeling strength, but in this case, FIG.
As shown in (1), there is a problem that the degree of freedom between the fibers 121 is reduced and the engaging portion is hardly caught, and as a result, the peeling strength is reduced.

Accordingly, an object of the present invention is to provide a good texture,
The productivity is good, the peel strength is excellent when the convex member of the mechanical fastener is adhered, and the fluff is small even when the convex member is peeled off after bonding, and the convex member is adhered again. It is an object of the present invention to provide a nonwoven fabric which can be used as a concave material of a mechanical fastener.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, they have difficulty in fusing with each other.
It has been found that a nonwoven fabric having more than one kind of fiber can achieve the above object.

[0006] The present invention (invention according to claim 1) has been made based on the above findings, mixed and fused together <br/> consists of two heat-fusible fibers have meat, Fibers of the same kind are strongly fused at their intersection,
The intersections are present throughout and are fused together as described above.
The two types of heat-fusible fibers that are difficult to perform are fibers having a core-sheath structure.
And the total amount of the two heat-fusible fibers is 100 parts by weight.
The present invention provides a nonwoven fabric characterized in that one of the fusible fibers is adjusted to 30 to 70 parts by weight in such a case .

Further, the present invention (the invention according to claim 2)
From three types of heat-fusible fibers that are difficult to fuse with each other
And the same type of fiber is
Are strongly fused, and the intersection exists throughout.
The three types of heat-fusible fibers, which are hard to fuse with each other,
It is a fiber having a core-sheath structure.
The total amount of the two heat-fusible fibers was 100 parts by weight
In some cases, one of the two heat-fusible fibers is
The above three types of heat-fusible fibers
When the total amount of
An object of the present invention is to provide a nonwoven fabric characterized in that adhesive fibers are used in an amount of 20 to 40 parts by weight . Further, in the present invention, the nonwoven fabric may have a large number of non-fused intersections where different fibers are overlapped and each fiber is crossed without being fused and / or each weakly fused intersection formed by each fiber being weakly fused. The nonwoven fabric according to claim 1 or 2 , wherein the mesh formed and including the intersection and the non-fusion intersection and / or the weak fusion intersection is deformable and expandable. Is provided. Further, the present invention provides the above nonwoven fabric, wherein the nonwoven fabric is used for a concave material of a mechanical fastener.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the nonwoven fabric of the present invention will be described in more detail. Nonwoven fabric of the present invention (invention according to claim 1) is composed of two heat-fusible fibers have fused difficulty mutually mixed. Here, the above-mentioned “it is difficult to fuse with each other”
This means that even if the same type of heat-fused components are fused together, even under the condition of fusing, they are not fused or fused, but compared with the fusion force when the same type of heat-fused components are fused together. Means a state of low fusion force.

[0009] Examples of the fused hard two heat fusible fibers to one another to be used in the nonwovens of the present invention, rather difficulty mutually fused, be used without any particular limitation as long as the fibers having a core-sheath structure In the present invention, in the present invention, a fiber having a core-sheath structure having a low-melting point polypropylene as a sheath component, a fiber having a core-sheath structure having a polyethylene as a sheath component, and a core-sheath structure having a melting point polyester as a sheath component are provided. Fibers selected from the group consisting of fibers are preferred.

That is, for example, when a fiber having a core-sheath structure having low-melting polypropylene as a sheath component is used as one of the above two fibers (hereinafter referred to as “fiber A”),
A fiber having a core-sheath structure containing polyethylene as a sheath component, as the other of the two types of fibers (hereinafter, referred to as “fiber B”);
It is preferable to use any of fibers having a core-sheath structure having a low-melting polyester as a sheath component. Further, in particular, as a fiber A, a fiber having a core-in-sheath structure having a low-melting polypropylene as a sheath component is used to impart sealing properties and strength to the obtained nonwoven fabric. It is preferable to use a fiber having a core-in-sheath structure containing polyethylene as a sheath component in order to impart a good touch and strength.

As the low-melting polypropylene used as the sheath component in the fiber having a core-sheath structure having the low-melting polypropylene as the sheath component, known low-melting polypropylene is used without any particular limitation.
The temperature is preferably from 30 to 150 ° C. As the core component, polyethylene terephthalate (melting point: 250 to 27)
0 ° C.) and polypropylene (melting point: 150 to 170 ° C.). The ratio of the sheath component to the core component is preferably such that the sheath component is 30 to 70 parts by weight, and the core component is preferably 70 to 30 parts by weight. Preferably, the component is 50 to 70 parts by weight, and the core component is 50 to 30 parts by weight. As a fiber having a core-sheath structure having such a low-melting-point polypropylene as a sheath component, SP fiber [for example, trade name “NBF (S
P) "manufactured by Daiwa Spinning Co., Ltd.], TPC fiber (for example, trade name" TPC "manufactured by Chisso Corporation), and PR-P (for example, trade name" PR "manufactured by Ube Nitto Kasei Co., Ltd.). You can also.

The polyethylene used as the sheath component in the fiber having a core-sheath structure containing the polyethylene as the sheath component preferably has a melting point of 120 to 140 ° C. Examples of the core component include polyethylene terephthalate (melting point: 250 to 270 ° C.), polypropylene (melting point: 150 to 170 ° C.), and the like. The ratio of the sheath component to the core component is preferably such that the sheath component is 30 to 70 parts by weight, and the core component is preferably 70 to 30 parts by weight. 5 ingredients
Preferably, the amount is 0 to 70 parts by weight, and the core component is 50 to 30 parts by weight. Examples of the fiber having a core-sheath structure containing polyethylene as a sheath component include F6 fiber (for example, trade name “TJ04CE” manufactured by Teijin Limited), ETC
Commercial products such as fiber (for example, trade name "ETC" manufactured by Chisso Polypro Corporation) and SH fiber (for example, trade name "NBF (SH)" manufactured by Daiwa Boseki Co., Ltd.) can also be used.

The low-melting polyester used as a sheath component in the fiber having a core-sheath structure containing the low-melting polyester as a sheath component can be used without particular limitation as long as it is a low-melting polyester. The temperature is preferably from 100 to 150 ° C. As the core component, polyethylene terephthalate (melting point: 250 to 27)
0 ° C.) and polypropylene (melting point: 150 to 170 ° C.). The ratio of the sheath component to the core component is preferably such that the sheath component is 40 to 90 parts by weight, the core component is 60 to 10 parts by weight, and the sheath component is 50 to 90 parts by weight. More preferably, the component is 50 to 10 parts by weight. Examples of fibers having a core-sheath structure having such a low-melting polyester as a sheath component include ELK fibers (for example, trade name “ELK”) and TBF fibers (for example, trade name “TBF”) (both manufactured by Teijin Limited). ) And commercially available products such as melty fiber (for example, trade name “Melty 4080” manufactured by Unitika Ltd.).

The thickness (fineness) of the fiber used for the fiber A and the fiber used for the fiber B may be the same or different, and specifically, is 2 to 15 d (denier). It is more preferably 3 to 6d. When the thickness is less than 2d, when the obtained nonwoven fabric is used as a concave material of a mechanical fastener, the space where the protruding member fits is reduced, and furthermore, the adhesion per one intersection of fibers of the same kind is performed. This is not preferable because the strength (fusion strength) decreases and the engaging force with the convex member when used as the concave material decreases. On the other hand, if it exceeds 15d, the adhesive strength per intersection increases, but the rigidity of the fiber increases, so that when used as the concave material, the protrusion of the convex member is undesirably reduced. Further, the length of each fiber may be the same or different, and specifically, 40 to 8
It is preferably 0 mm.

[0015] The mixing ratio between the fibers A and the fibers B shall be the 30 to 70 parts by weight of the fibers A in a case where the total amount of the upper Symbol fibers A and the fibers B is 100 parts by weight. still,
The same applies to the case where the fiber C described later is used. More specifically, when a fiber having a core-sheath structure using the low melting point polypropylene as a sheath component is used as the fiber A, and a fiber having a core-sheath structure using polyethylene as a sheath component is used as the fiber B, When the total amount of the fiber A and the fiber B is 100 parts by weight,
It shall be the 70 parts by weight. In this case, if the blending ratio of the fiber A is less than 30 parts by weight or more than 70 parts by weight, the degree of freedom of the fiber is reduced, and it is not preferable that the nonwoven fabric is made of a single fiber.

Further, the nonwoven fabric of the present invention (the invention according to claim 2) further comprises a fiber (hereinafter referred to as "fiber C") that is difficult to fuse with any of the above two types of fibers, namely, fiber A and fiber B. ) Ru der plus. The fiber C is a fiber having a core-sheath structure having the above-mentioned low-melting polypropylene as a sheath component,
Fibers selected from the group consisting of fibers having a core-sheath structure having the above-mentioned polyethylene as a sheath component and fibers having a core-sheath structure having the above-mentioned low-melting polyester as a sheath component are preferably used. That is, for example, when a fiber having a core-sheath structure using the above-mentioned low-melting polypropylene as a sheath component is used as the fiber A, and a fiber having a core-sheath structure using the above polyethylene as a sheath component is used as the fiber B, As the fiber C, it is preferable to use a fiber having a core-sheath structure containing the above-mentioned low-melting polyester as a sheath component. As described above, by using a three-component system (a system in which the above-described three types of fibers are mixed), the degree of freedom of the fibers is further increased in the obtained nonwoven fabric compared to the two-component system while maintaining an appropriate fiber density. be able to.

The thickness and length of the fiber C can be appropriately selected within the range described in the description of the fibers A and B.

In the case where the above fiber C is used, the fiber C
Ratio of formulation, the total weight 100 parts by weight of the fiber A through C, shall be the fiber C20~40 parts. More specifically,
As the fiber A, a fiber having a core-sheath structure using the low-melting polypropylene as a sheath component is used. As the fiber B, a fiber having a core-sheath structure using a polyethylene as a sheath component is used. As the fiber C, a low-melting polyester is used as a sheath component. When a fiber having a core-sheath structure is used, the total weight
Respect shall be the 20 to 40 parts by weight fibers.

In the present invention, desired types of fibers that are difficult to fuse with any of the above three types of fibers can be added.

The basis weight of the nonwoven fabric of the present invention obtained by mixing the above fibers is preferably ²⁰ to 50 g / m ² , and the fiber density is preferably 0.01 to 0.05 g / cm ^3. preferable.

In the nonwoven fabric of the present invention, fibers of the same kind among the above fibers are strongly fused at their intersections, and the intersections exist over the entirety (the entire nonwoven fabric) ( Uniformly present). Regarding this point (the structure of each fiber in the nonwoven fabric of the present invention), FIGS.
This will be described with reference to FIG. Here, FIG. 1 is a schematic diagram schematically showing the structure of each fiber in one mode of the nonwoven fabric of the present invention, and FIG. 2 shows the nonwoven fabric shown in FIG. It is a schematic diagram which shows the state which was entangled.
In the following description, a two-component system consisting of the fibers A and B will be described, but the same description applies to a system containing three or more fibers.

The nonwoven fabric 1 of the present invention in the form shown in FIG. 1 is obtained by mixing fibers A and B which are hardly fused to each other. In the nonwoven fabric 1, the fibers A are at the intersections a between the fibers A, and the fibers B are at the intersections b between the fibers B, and the fibers of the same type (the fiber A and the fiber A or the fiber B And the fiber B) are strongly fused. In addition, the intersections exist substantially uniformly throughout the entire nonwoven fabric. Here, "substantially uniformly" means that the nonwoven fabric is present uniformly and evenly throughout the nonwoven fabric. Further, the number of the intersections per square meter (the total number of the intersections a and b) is preferably 2.5 × 10 ^{6 to} 1.0 × 10 ⁸ / m ² . The term "strong fusion" refers to fusion between heat fusion components of the same type, and a single yarn fusion force of 3 gf or more. In addition, the single yarn fusion force is measured according to the following measuring method.

<Measurement Method of Single Yarn Fusing Force> As shown in FIG. 3 (a), a pattern 41 having a square cut (indicated by a dashed line in FIG. The two single fibers 42, 42 'are placed so as to be orthogonal to each other and the intersection is located at the center of the above-mentioned square cut,
The single fibers 42, 42 'are bonded to the pattern 41 with an adhesive. Next, hot air at a processing temperature of 143 ° C. was applied to the paper pattern 41 to which the single fibers 42 and 42 ′ were attached by a wind speed of 2.3 m.
At / sec, heat treatment is performed by spraying for 12 seconds. FIG. 3 (b) shows the pattern 41 to which the heat treatment is performed and the individual fibers are thermally bonded.
Are cut along the dotted lines shown in Fig. 3 to obtain square pieces 43, 43 'in which the ends of the single fibers 42, 42' are respectively bonded as shown in Fig. 3 (c). Next, each section 43, 4
3 ′ in the direction of the arrow shown in FIG.
Pull at a speed of min, measure the strength at the intersection, and use this as the single yarn fusion force.

Further, as shown in FIG.
Are formed from the same type of fiber networks A ′ and B ′, which are made of the same type of fiber, that is, the same type of fiber network A ′ surrounded by the fiber A and the intersection point a, and the same type fiber network B ′ surrounded by the fiber B and the intersection point b. Have been. In addition, a large number of non-fused intersections c where the heterogeneous fibers, that is, the fibers A and B are overlapped and the respective fibers A and B are crossed without being fused, and a number of weakly fused intersections d formed by being weakly fused are formed. Have been. Here, "weak fusion"
The term “fusion” refers to fusion between different kinds of heat fusion components and a single yarn fusion force of 2 gf or less.

Further, the mesh C 'formed including the intersections a and b and the non-fusion intersection c and / or the weak fusion intersection d can be freely deformed and expanded. Specifically, the mesh C ′ is formed by overlapping the same kind of fiber network A ′ and the same kind of fiber network B ′, that is, a part of the mesh formed by the different kinds of fibers. It is formed to include the fusion intersection c or the weak fusion intersection d.

The nonwoven fabric of the present invention has a high degree of freedom of each of the fibers A and B because the non-fused intersection point c is present, and the weakly fused intersection point d easily comes off with a slight stress. When used as a concave material of a mechanical fastener, it acts in the same manner as the non-fused intersection point c, so that each fiber A and B has a high degree of freedom. Therefore, the same type of fiber networks A ′ and B ′ are freely deformable, and the above network C ′ is not only deformable but also freely openable. That is, even if the fiber density is made equal to or higher than that of a normal nonwoven fabric and the inter-fiber distance L is set to be equal to or smaller than that of a normal nonwoven fabric, the degree of freedom of each fiber A and B is high. C 'is freely deformed and expanded. In other words, since the nonwoven fabric of the present invention is formed as described above, even if the fiber density is equal to or higher than that of a normal nonwoven fabric, the inter-fiber distance in the same type of fiber network [here, the "fiber" The term “inter-distance” means the distance between the same type of fused fibers (L ′ shown in FIG. 1)]
Is larger than that of a normal nonwoven fabric. For example, fiber A
The fiber-to-fiber distance of the non-woven fabric of the present invention, in which the mixing ratio of the fiber B to the non-woven fabric of the present invention is 1: 1, is about twice as large as the normal fiber-to-fiber distance between single non-woven fibers having the same fiber density. Become.

Therefore, when the nonwoven fabric of the present invention is used, for example, as a female material of a mechanical fastener, the distance between the fibers is sufficient, the same type of fiber networks A 'and B' can be deformed, and further, the above network C ' Can be freely deformed and expanded,
As shown in FIG. 2, the engaging portions 10 of the convex members smoothly move into the spaces between the fibers AA, BB and AB, that is, the same type of fiber networks A ′ and B ′, and thus the network C ′. Into the inner space and is engaged with the fibers A and B. In particular, since the mesh C 'has a high degree of freedom and is freely deformable and expandable, the engaging portion 10 can easily enter a space in the mesh C',
As a result, it is easily engaged with each fiber. Further, as shown in FIG. 2, since each constituent fiber has a higher degree of freedom than a non-woven fabric made of a single fiber, a plurality of fibers can be entangled with one engaging portion 10, and the peeling force can be increased. The strength is further improved as compared with a nonwoven fabric or the like made of a single fiber, and the fluff when the convex member is peeled is reduced.

Further, if a fiber having a high fusion strength (for example, a fiber having a large sheath component) is used as the fiber A or the fiber B, the peeling strength when the convex member is bonded can be increased. . The inter-fiber distance L varies depending on the type and number of fibers used, the mixing ratio and the fiber density, but in the nonwoven fabric of the present invention, preferably 50 to 80.
0 μm.

The tensile strength of the nonwoven fabric of the present invention is MD
1000g in the direction (machine flow direction during manufacture)
Weight / 50 mm or more, and preferably 200 g weight / 50 mm or more in the CD direction (direction perpendicular to the MD direction). Here, the tensile strength is measured by the following measuring methods. Tensile strength; Orientec Co., Ltd.
Using "Tensilon RTA-100", a non-woven fabric cut into 200 x 50 mm was prepared as a sample. Then, the sample is placed at a distance of 75 m between chucks.
m, the sample was pulled under the conditions of a pulling speed of 300 mm / min, and the stress when the sample was broken was measured. The measurement was performed 10 times in each of the MD direction and the CD direction, and the average value was used as the measured value.

The nonwoven fabric of the present invention can be manufactured as follows. That is, in the case where the nonwoven fabric is a two-component system composed of the two types of the fibers A and B, the fibers are mixed according to a conventional method to form a fibrous web.
Hot air of 30 to 150 ° C is blown at a wind speed of 1 to 2 m / s for 5 to 10
(Sec) It can be easily obtained by an air-through method in which the fiber web is blown for a time. When the nonwoven fabric is composed of three or more types of fibers, it can be easily obtained by forming a web composed of three types of A, B, and C, and then treating the web by the air-through method as in the case of the two-component system. it can. Further, the nonwoven fabric of the present invention can be easily obtained by a method for obtaining a normal nonwoven fabric such as embossing.

Since the nonwoven fabric of the present invention is constituted as described above, it is useful as a concave material of a mechanical fastener, and can also be used as a member such as a floor wiper, a napkin, a diaper, a surface material and the like. . The mechanical fastener convex member is a sheet or the like provided with a large number of convex engaging portions such as a key shape and a mushroom shape, and includes "magic tape" (registered trademark, manufactured by Kuraray Co., Ltd.), " Commercial products such as "Quicklon" (registered trademark, manufactured by YKK) and "Majicross" (registered trademark, manufactured by Kanebo Bell Touch) can be used without particular limitation. The concave member means a sheet or the like which can be engaged with the convex member.

[0032]

EXAMPLES Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

[Example 1] A nonwoven fabric was produced according to the following production method using the following fibers A and B in the following amounts, and a nonwoven fabric of the present invention was obtained. Fiber A: a fiber having a core-sheath structure in which polyethylene terephthalate (PET) is used as a core component and polyethylene (PE) is used as a sheath component, a weight ratio of the core component and the sheath component: core component / sheath component = 40/60, fiber 4d × 51 mm; blending amount of fiber A = 50 parts by weight fiber B; PET as a core component, polypropylene (PP)
Having a core-in-sheath structure having the following as a sheath component, weight ratio of the core component and the sheath component: core component / sheath component = 50/50, fiber size 4d × 51 mm; blending amount of fiber B = 50 parts by weight Method: A card web was prepared by mixing the fibers A and B in the above mixing ratio, and the obtained card web was mixed
Treated with hot air at 2 ° C and wind speed of 1-2m / sec for 6sec,
A nonwoven fabric having a basis weight of 27 g / m ² was obtained.

Next, the obtained nonwoven fabric was evaluated by performing the following tests. As a result, the tack force and the peeling force were 83 gf and 160 gf, respectively, the shearing force was 2160 gf, and the fluffing was second grade.

(Tack Force) As shown in FIG. 4, the obtained nonwoven fabric 1 has a convex member 20 (30 × 40 mm) (see FIG. 5).
(“CS-200 900PPI” (trade name, manufactured by 3M)) is crimped, and the mount 22 on which the convex member 20 is provided is pulled at 300 mm / min in the vertical direction (arrow direction), and the convex member 20 is separated from the nonwoven fabric 1. Was determined as the tack force. Crimping is performed by placing the convex member 20 on the nonwoven fabric 1 and
The test was performed by applying a static load of 6.7 gf / cm ² for 10 seconds. As shown in FIG. 5, the convex member 20 is fixed on one surface of the mount 22 via a double-sided tape 23, and at a position facing the convex member 20 on the other surface of the mount 22. An acrylic plate 21 is fixed via a double-sided tape 23 to keep the peeling angle at 0 °. Further, as shown in FIG.
It was used by being fixed thereon with a double-sided tape 2 interposed.

(Peeling Force) The nonwoven fabric 1 is cut into a size of 5 cm × 5 cm, and the nonwoven fabric 1 is placed on an outer nonwoven fabric (back sheet) of Merize pants (trade name, disposable diaper manufactured by Kao Corporation) using a double-sided tape. Pasted. Also, 3cm x 2
cm of a convex member, and the back side of the convex member is 3 cm × 3.
cm, and a base film having the same size as that of the convex member is pasted on the mount, and on one end side, a portion composed of only the mount is formed with a width of 10 mm. Sample 20 'was made. Next, as shown in FIG. 7, the convex member sample 20 'is
Is left on the non-woven fabric 1 except for 10 mm (a portion formed only by the mount), and the convex member sample 20 ′
The convex member sample 20 ′ was pressed against the nonwoven fabric 1 by reciprocating a 1 kg roller once. After that, with the one end 20a, the convex member sample 20 'is moved 30 degrees in the direction of the arrow (the same direction as the longitudinal direction of the convex member sample 20').
It was pulled at 0 mm / min, and the force required for the protruding member sample 20 ′ to be peeled from the nonwoven fabric 1 was measured. The same operation was repeated 10 times, and the average value was defined as the peeling force.
In addition, the data processing of the measurement data is performed by a peeling test mode data processing software [trade name “MP
-100P "(MS-DOS) Ver. 43.1], and the peeling force was evaluated based on the “5 point average load value”. The mount and the base film are not particularly limited as long as the convex member can be fixed.

(Fuzziness) The fluffiness was evaluated on a five-point scale by visually observing the surface of the nonwoven fabric 1 after the measurement of the peeling force. 1st grade; no fuzziness 2nd grade; fuzzy small 3rd grade; fuzzy medium 4th grade; fuzzy large 5th grade;

(Shearing force) The nonwoven fabric 1 was cut into a size of 5 cm × 5 cm, and the nonwoven fabric 1 was bonded to an acrylic plate using a double-sided tape. Also, a convex member 20 of 3 cm × 2 cm is prepared, and the rear side of the convex member 20 is 3 cm as shown in FIG.
Affixed to one end of a backing 31 having a size of 12 cm, and 3 cm × 7
cm of the base film 32, and one end 30
On the side a, a sample tape 30 was formed in which a portion consisting of only the backing 31 was formed in 50 mm. Then
As shown in FIG. 8, the sample tape 30 is
0 is rested on the nonwoven fabric 1 so that the convex member 20 is in contact with the nonwoven fabric 1, and a 1 kg roller is reciprocated on the sample tape 30 by one reciprocation. Was pressed to the nonwoven fabric 1. afterwards,
While holding the one end 30a, the sample tape 30 is pulled at 300 mm / min in the direction of the arrow (the same direction as the longitudinal direction of the acrylic plate and the sample tape 20). The required force was measured. The same operation was repeated 10 times to obtain measurement data. The obtained measurement data is used for the Orientec Co., Ltd. peel test mode data processing software [trade name “MP
-100P "(MS-DOS) Ver. 43.1], and the shear force was evaluated based on the “maximum point load value”. The mount and the base film are not particularly limited as long as the convex member can be fixed.

Example 2 A nonwoven fabric was produced according to the following production method using the following fibers A, B and C in the following amounts to obtain a nonwoven fabric of the present invention. Fiber A; a fiber having a core-sheath structure in which PET is used as a core component and PE is used as a sheath component, weight ratio of the core component and the sheath component: core component / sheath component = 40/60, fiber size 3d × 51 mm;
Amount of fiber A = 35 parts by weight Fiber B; fiber having a core-sheath structure using PET as a core component and PP as a sheath component, weight ratio of core component to sheath component: core component / sheath component = 50/50 , Fiber size 3d × 51mm;
Amount of fiber A = 35 parts by weight Fiber C; fiber having a core-sheath structure in which PET is a core component and PET is a sheath component, weight ratio of core component to sheath component: core component / sheath component = 50/50 , Fiber size 3d × 51m
m; blending amount of fiber A = 30 parts by weight Production method: produced in the same manner as in Example 1, and weighed 30 g /
It was obtained m ² of non-woven fabric.

Next, the same test as in Example 1 was performed on the obtained nonwoven fabric and evaluated. As a result, the tack force and the peeling force were 102 gf and 153 gf, respectively. Further, the shearing force is 2200 gf and the fuzz is 3 g.
It was class.

Comparative Example 1 A non-woven fabric was obtained in the same manner as in Example 1 except that only the following fiber A was used. Fiber A: a fiber having a core-sheath structure with PET as a core component and PE as a sheath component, weight ratio of the core component and the sheath component: core component / sheath component = 40/60, fiber size 4d × 51 mm

Next, the same test as in Example 1 was performed on the obtained nonwoven fabric and evaluated. As a result, the tack force and the peeling force were 36 gf and 102 gf, respectively. In addition, the fluffing is first class, and the shearing force is 1850.
gf.

Comparative Example 2 A nonwoven fabric was produced in the same manner as in Example 1 except that the following fibers A and B were used in the following amounts. 1 Fiber A: fiber having a core-sheath structure in which PET is used as a core component and PE is used as a sheath component, weight ratio of the core component and the sheath component: core component / sheath component = 40/60, fiber size 4d × 51 m
m; blending amount of fiber A = 20 parts by weight fiber B; fiber having a core-sheath structure in which PET is a core component and PP is a sheath component, weight ratio of core component to sheath component: core component / sheath component = 50 / 50, fiber size 4d × 51mm;
Fiber A content = 80 parts by weight

Next, the same test as in Example 1 was performed on the obtained nonwoven fabric and evaluated. As a result, the tack force and the peeling force were 64 gf and 97 gf, respectively.
Moreover, the fluffing is of the third grade, and the shearing force is 1980 gf.
Met.

Comparative Example 3 A nonwoven fabric was produced in the same manner as in Example 1 except that only the following fiber A was used. Fiber A: a fiber having a core-sheath structure with PET as a core component and PE as a sheath component, weight ratio of the core component and the sheath component: core component / sheath component = 50/50, fiber size 4d × 51 mm

Next, the obtained nonwoven fabric was evaluated by performing the same test as in Example 1. As a result, the tacking force and the peeling force were 32 gf and 62 gf, respectively.
In addition, the fluffing is of the second grade, and the shearing force is 1490 gf.
Met.

[0047]

[Table 1]

[0048]

The nonwoven fabric of the present invention has a good texture, good productivity, excellent peeling strength when a convex member of a mechanical fastener is bonded, and is peeled after bonding the convex member. In this case, the protrusion is less fuzzy and can be bonded to the convex member again, and is useful as a concave material of a mechanical fastener.

[Brief description of the drawings]

FIG. 1 is a schematic view schematically showing the structure of each fiber in one embodiment of the nonwoven fabric of the present invention.

FIG. 2 is a schematic diagram showing a state where a convex member of a mechanical fastener is entangled with the nonwoven fabric shown in FIG. 1;

FIGS. 3 (a) to 3 (c) are schematic diagrams each showing a method of measuring a single yarn fusion force.

FIG. 4 is a schematic view showing a method of measuring a tack force.

FIG. 5 is a schematic view showing a method of attaching a convex member of a mechanical fastener when measuring a tack force.

FIG. 6 is a schematic view showing a method of attaching a nonwoven fabric when measuring tack force.

FIG. 7 is a schematic view showing a method for measuring a peeling force.

FIG. 8 is a schematic view showing a method for measuring a shear force.

FIG. 9 is a partially enlarged view of a conventional concave member sheet.

FIG. 10 is a partially enlarged view showing a conventional nonwoven fabric.

FIG. 11 is a partially enlarged view showing a conventional nonwoven fabric.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-220355 (JP, A) JP-A-7-166457 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D04H 1/00-18/00 A44B 13/00-18/00

Claims (4)

(57) [Claims] 1. A consists mixed together fused difficulty have 2 kinds of heat-fusible fibers, fibers of the same kind, in their intersections are each fiber TsuyoToruchaku, intersection point whole It is present over, two heat-fusible fibers to one another fused hard described above, the core-sheath
A fiber having a structure, and the sum of the two heat-fusible fibers
When the amount is 100 parts by weight, one of the fusible fibers is 30 to 7
0 parts by weight to the nonwoven fabric, wherein the tare Rukoto. 2. Three kinds of heat which are hardly fused to each other.
Consisting of fusible fibers, fibers of the same type
Each fiber is strongly fused, and the intersection is
The above three types of heat-fusible fibers which are hardly fused to each other are core-sheath
A fiber having a structure, of the three heat-fusible fibers
When the total amount of the two types of heat-fusible fibers is 100 parts by weight
Then, one of the two types of heat-fusible fibers is
Parts by weight, and the combination of the three heat-fusible fibers
When weighing 100 parts by weight, the remaining one type of heat-sealable
Non-woven, characterized in that the fiber is 20 to 40 parts by weight
cloth. 3. The nonwoven fabric has a large number of non-fused intersections where different fibers are overlapped and each fiber is crossed without being fused and / or a plurality of weakly fused intersections formed by each fiber being weakly fused. The nonwoven fabric according to claim 1 or 2, wherein the mesh formed including the intersections and the non-fusion intersections and / or the weak fusion intersections is freely deformable and expandable. . 4. The nonwoven fabric according to claim 1, wherein the nonwoven fabric is used for a concave material of a mechanical fastener.