JP6243818B2 - Reticulated laminated nonwoven fabric - Google Patents

Description

  The present invention relates to a reticulated laminated nonwoven fabric and a method for producing the same. In particular, the present invention relates to a reticulated laminated nonwoven fabric having an excellent balance between extensibility in the width direction and strength, and also having design properties, and a method for producing the same.

  Conventionally, the split fiber nonwoven fabric invented by the present applicants is known (for example, Patent Document 1). Such a split fiber non-woven fabric is formed by stretching a melted resin film formed with a T die or a tubular die, and then splitting the split fibers (split fibers) obtained by splitting the fibers into a fixed width. Then, it is obtained by laminating processes so that the orientation axes intersect.

  On the other hand, a method of continuously producing a wide network stretched membrane having a lateral network by stretching in the cut direction after making a cut in the transverse direction of the unstretched film by the applicants is known. (For example, Patent Document 2). A continuous reticulated nonwoven fabric obtained by laminating split fibers of a reticulated structure on this wide reticulated stretched membrane has also been invented and manufactured by the applicants and is widely known.

  In addition, a net-like body is known in which stretched tapes obtained by uniaxially stretching polyethylene or polypropylene are used, and the intersections are bonded in a lattice pattern of two axes in the vertical and horizontal directions, or three axes in the vertical and both diagonal directions. .

JP 2010-105312 A JP-A-55-107427

  The continuous fiber nonwoven fabric obtained by laminating the split fiber of the network structure on the split fiber nonwoven fabric described in Patent Document 1 and the wide network stretched film of Patent Document 2 is obtained by orthogonally laminating stretch reinforcing fibers in the longitudinal direction and the transverse direction. Therefore, the strength in the vertical direction and the horizontal direction is high. However, with respect to the oblique direction, there is a problem that the tensile strength is inferior to the strength in the longitudinal direction and the transverse direction due to its structure.

  On the other hand, a net-like body in which intersections are bonded in the form of a lattice of three axes, both vertically and diagonally, is sold as a product. However, although this net-like nonwoven fabric is excellent in the strength in the longitudinal direction and the oblique direction, there is a problem that the strength in the lateral direction is weak and there is no extensibility.

  Furthermore, in any of the techniques of Patent Documents 1 and 2, the nonwoven fabric or the net itself did not have extensibility because the fibers themselves did not have extensibility.

  There has been a demand for a reticulated laminated nonwoven fabric that has excellent tensile strength in an oblique direction and has extensibility in a specific direction.

The present invention has been made to solve the above problems. That is, the present invention is a reticulated laminated nonwoven fabric, and the main textiles extending parallel to each other, and uniaxially stretched reticular film layer and a branch fiber connecting said stem fibers adjacent to, the uniaxially stretched reticular film layer A first stretched tape group layer composed of a first stretched tape group obliquely extending in the stretching direction and extending in parallel with each other, and a stretching direction of the uniaxially stretched network film layer from a direction opposite to the first stretched tape group layer And a second stretched tape group layer composed of a second stretched tape group extending in parallel with each other.

  In the reticulated laminated nonwoven fabric, the uniaxially stretched reticulated film layer is a split fiber film layer obtained by splitting and widening a multilayer polyolefin film uniaxially stretched in the longitudinal direction, the first stretched tape and The second stretched tape is preferably a multilayer polyolefin stretched tape that is uniaxially stretched in the longitudinal direction.

  A second thermoplastic resin having a melting point lower than that of the first thermoplastic resin on both sides of the layer made of the first thermoplastic resin, wherein the multilayer polyolefin film and the multilayer polyolefin stretched tape are the net-like laminated nonwoven fabric. It is preferable to have a layer structure in which layers made of

  In the net-like laminated nonwoven fabric, a plurality of first stretched tapes constituting the first stretched tape group are arranged at substantially equal intervals, and a plurality of second stretched tapes constituting the second stretched tape group are provided. The first stretched tape group is preferably arranged at substantially the same intervals.

  In the reticulated laminated nonwoven fabric, it is preferable that the first stretched tape group and the second stretched tape group form an angle of 30 to 150 °.

  According to another embodiment of the present invention, there is provided a method for producing a reticulated laminated nonwoven fabric, the step of splitting a multi-layer film uniaxially stretched in the longitudinal direction and then widening to obtain a uniaxially stretched reticulated film layer; The first uniaxially stretched network film layer, a first stretched tape group layer comprising a first multilayer polyolefin stretched tape group uniaxially stretched in the longitudinal direction, and a second multilayer polyolefin stretched tape group uniaxially stretched in the longitudinal direction A layer of the second stretched tape group, wherein the first stretched tape group is laminated obliquely in the stretching direction of the uniaxially stretched network film layer, and the second stretched tape A group is laminated obliquely from the opposite direction to the stretching direction of the uniaxially stretched network film layer from the opposite direction to the first stretched tape group, the uniaxially stretched network film layer, and the first stretched tape group layer And before A second stretched tape group layer, and a step of bonding at their points of intersection.

  According to the present invention, the uniaxially stretched reticulated film layer has a high tensile strength in the stretching direction and the oblique direction, and the balance between extensibility and strength in a specific direction different from the stretching direction, such as the width direction or the longitudinal direction. A reticulated laminated nonwoven fabric can be obtained. Moreover, since the number per unit length in the width direction of the trunk fiber of the net-like film can be adjusted, there is an advantage that desired extensibility can be obtained and various designs are possible. Furthermore, the reticulated laminated nonwoven fabric according to the present invention is excellent in design and can be used for many applications such as sanitary materials, house wraps, produced bags, and interior materials. In particular, because of excellent extensibility, it is advantageous in applications in which it is applied as an interior material or the like following an uneven surface.

It is a notional top view of a net-like lamination nonwoven fabric concerning one embodiment of the present invention. It is a figure which shows notionally the split fiber film layer which is an example of the net-like film which comprises the net-like laminated nonwoven fabric which concerns on one Embodiment of this invention. It is a notional top view of the manufacturing apparatus for manufacturing the net-like lamination nonwoven fabric concerning one embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited to the embodiments described below.

The present invention relates to a reticulated laminated nonwoven fabric according to one embodiment. Reticulated laminated nonwoven fabric, and the main textiles extending parallel to each other, and uniaxially stretched reticular film layer and a branch fiber connecting said stem fibers adjacent to, obliquely intersects the extending direction of the uniaxially stretched reticular film layer, and A first stretched tape group consisting of a first stretched tape group extending in parallel with each other, and obliquely crossing in the stretching direction of the uniaxially stretched network film layer from a direction opposite to the first stretched tape group layer and parallel to each other And a second stretched tape group layer composed of a second stretched tape group extending in the direction.

Reticulated film layer, if uniaxially stretched film comprising the structural features of the stem textiles and branch fibers are not particularly limited, for example, Preferred examples of the mesh film, and a split-fiber film. The split fiber film is obtained by splitting and then widening a multilayer film uniaxially stretched in the longitudinal direction. In the following embodiments, an embodiment in which a split fiber film is mainly used as the net film will be described, but the net film of the present invention is not limited to the split fiber film. In the present specification, the “longitudinal direction” of the nonwoven fabric and the film constituting the nonwoven fabric is also referred to as the longitudinal direction, and means the machine direction, that is, the feeding direction in producing the nonwoven fabric and the film constituting the nonwoven fabric. Represented by L. On the other hand, the “width direction” is also referred to as a horizontal direction, which means a direction perpendicular to the vertical direction, and is represented by T in the drawing.

  FIG. 1 is a conceptual plan view of a network laminated nonwoven fabric according to an embodiment of the present invention. The reticulated laminated nonwoven fabric 100 includes a split fiber film layer 20 that is an example of a uniaxially stretched reticulated film layer, a first stretched tape group layer composed of a first stretched tape 30 group, and a second stretched tape 40 group. It is mainly composed of the second stretched tape group layer.

(1) Split fiber film layer In FIG. 2, the perspective view of the split fiber film 20 single-piece | unit before laminating | stacking as the fiber orthogonal laminated nonwoven fabric 100 is shown. As shown in FIG. 2 (a), a plurality of trunk fibers 20a extending in parallel with each other and branch fibers 20b extending across the trunk fibers 20a and connecting the adjacent trunk fibers 20a are formed. The branch fibers 20b are thinner than the trunk fibers 20a, and the mechanical strength of the split fiber film 20 is mainly provided by the trunk fibers 20a. As shown in FIG. 2B, the split fiber film 20 is made of a second thermoplastic resin having a melting point lower than that of the first thermoplastic resin on both surfaces of the layer 20c made of the first thermoplastic resin. It has a layered structure in which the layers 20d are stacked.

  The thickness of the layer 20d made of the second thermoplastic resin is 50% or less of the total thickness of the split fiber film 20, desirably 40% or less. In order to satisfy various physical properties such as adhesive strength at the time of thermal welding with a stretched tape group described later, the thickness of the layer 20d made of the second thermoplastic resin may be 5 μm or more, preferably 10 to 100 μm. Is selected from the range.

  Examples of the resin constituting the split fiber film 20 include polyolefins such as polyethylene and polypropylene and copolymers thereof, polyethylene terephthalate, polyesters of polybutylene terephthalate group and copolymers thereof, and polyamides such as nylon 6 and nylon 66 And copolymers thereof, polyvinyl chloride, polymers and copolymers of methacrylic acid or derivatives thereof, polystyrene, polysulfone, polytetrachloroethylene polycarbonate, polyurethane and the like. The split fiber film 20 has high tensile strength in the stretching direction. Among these, polyolefins having good splitting properties and polymers thereof, polyesters and polymers thereof are preferable. Further, the difference in melting point between the first thermoplastic resin and the second thermoplastic resin is required to be 5 ° C. or more, and preferably 10 to 50 ° C. for manufacturing reasons.

  Examples of the method for producing the split fiber film 20 include the following methods. First, the resin constituting each layer is kneaded, and then the layer 20d made of the second thermoplastic resin on both surfaces of the layer 20c made of the first thermoplastic resin by extrusion molding such as a multilayer inflation method or a multilayer T-die method. A raw film having a three-layer structure in which is laminated is manufactured. Next, the raw film is stretched in the longitudinal direction (longitudinal direction). The draw ratio is preferably 1.1 to 15 times, more preferably 3 to 10 times. If the draw ratio is less than 1.1 times, the mechanical strength may not be sufficient. On the other hand, when the draw ratio exceeds 15 times, it is difficult to stretch by a usual method, and there may be a problem that an expensive apparatus is required. Stretching is preferably performed in multiple stages in order to prevent stretching unevenness. Subsequently, the stretched film is split in a vertical direction using a splitter (split processing) to form a large number of parallel slits. Furthermore, it widens in the direction orthogonal to this. Thereby, the split fiber film 20 in which the trunk fibers 20a are arranged substantially in the vertical direction as shown in FIG. 2A is obtained. The split fiber film layer 20 thus manufactured has a high tensile strength in the stretching direction.

  As the net-like film layer, in addition to the split fiber film layer 20 described in detail, for example, a raw film having the same configuration as the split fiber film layer 20, after forming a large number of slits in the lateral direction, What is obtained by drawing at the same draw ratio as the split fiber film layer 20 can be used. In this case, the reticulated laminated nonwoven fabric obtained by laminating with the first stretched tape group layer and the second stretched tape group layer has the characteristics of having strength in the transverse direction and excellent extensibility in the longitudinal direction.

(2) First Stretched Tape Group Layer The first stretched tape group layer is composed of a first stretched tape group that obliquely crosses in the stretching direction of the split fiber film layer 20 and extends in parallel with each other. In FIG. 1, a plurality of first stretched tape 30 groups extending from the lower left to the upper right of the paper surface constitute a first stretched tape group layer. It is preferable that the certain 1st extending | stretching tape 30 is arrange | positioned substantially parallel to the other adjacent 1st extending | stretching tape 30 with a predetermined fixed distance. The direction extending from the lower left to the upper right of the first group of stretched tapes 30 forms an angle α with respect to the stretching direction L of the split fiber film layer 20. The value of α can be determined by those skilled in the art according to the purpose and application. In typical embodiments, α is 15 to 75 °, preferably 30 to 60 °, but is not limited to a particular angle. In the illustrated embodiment, α is 60 °. In addition, also when a mesh film is not a split fiber film, the said angle (alpha) is similarly set with respect to the extending | stretching direction of the said mesh film.

  In the first stretched tape group layer, the distance between adjacent first stretched tapes 30 is not limited to a specific distance, and can be determined according to the purpose and application. In a preferred embodiment, the distances between adjacent first stretched tapes 30 are all approximately equal. That is, in the 1st extending | stretching tape group layer, each 1st extending | stretching tape 30 is arrange | positioned at substantially equal intervals. In another embodiment, the distance between adjacent stretched tapes may be different.

  The width of the first stretched tape 30 can also be determined by those skilled in the art according to its purpose and application. The width of the 1st extending | stretching tape 30 can affect the intensity | strength of the width direction of the net-like laminated nonwoven fabric 100, and a diagonal direction. In a preferred embodiment, each first stretched tape 30 has substantially the same width. In another embodiment, the first stretched tapes 30 may have different widths. Moreover, although the linear density of the 1st extending | stretching tape 30 may be 95-540 denier, for example, it is not limited to a specific value. In the above linear density range, the tape width is determined in relation to the tape thickness.

  The 1st extending | stretching tape 30 consists of 2nd thermoplastic resin which has melting | fusing point lower than 1st thermoplastic resin on both surfaces of the layer which consists of 1st thermoplastic resin similarly to the split fiber film layer 20. FIG. It is preferable to have a layer structure in which layers are stacked. And it is uniaxially stretched in the longitudinal direction of the first stretched tape 30. The thickness of the layer made of the second thermoplastic resin may be the same as that described for the split fiber film 20.

  As a material which comprises the 1st extending | stretching tape 30, it may be the same as that of the split fiber film layer 20, and it is preferable to consist of the material same as the split fiber film layer 20 especially. This is because it is advantageous when bonding by heat welding. However, the first stretched tape 30 may be made of a material different from that of the split fiber film layer 20.

  The first stretched tape 30 is preferably a multilayer polyolefin stretched tape uniaxially stretched in the longitudinal direction. As a manufacturing method of the first stretched tape 30 group, various known methods may be mentioned. For example, a multilayer polyolefin stretched tape uniaxially stretched in the longitudinal direction is a layer made of a second thermoplastic resin on both sides of a layer made of a first plastic resin by extrusion molding such as a multilayer inflation method or a multilayer T-die method. Is manufactured and then cut into a predetermined width, preferably a constant width, and then parallel to the cutting direction at a predetermined draw ratio, for example, a draw ratio of 1.1 to 15 times. Can be obtained by uniaxial stretching. The draw ratio may be the same as the preferred ratio used in the production of the split fiber film layer 20. Alternatively, after producing the raw film, the film is stretched to the above-mentioned predetermined stretch ratio, and then cut into a predetermined width along the stretch direction, whereby a multilayer polyolefin stretched tape stretched uniaxially in the longitudinal direction can be obtained. . On the other hand, about the stretched tape group which consists of polyester, it can manufacture by the method as described in Unexamined-Japanese-Patent No. 2011-174201, for example.

  Moreover, the thickness of the 1st extending | stretching tape 30 may be the same with respect to the thickness of the split fiber film layer 20, may differ, and those skilled in the art can determine suitably. For example, the thickness of the split fiber film layer 20 may be, for example, about 10 to 200 μm, preferably about 10 to 70 μm, and the thickness of the first stretched tape 30 may be the same.

(3) Second Stretched Tape Group Layer The second stretched tape group layer is obliquely crossed in the stretching direction of the split fiber film layer 20 from the direction opposite to the first stretched tape group layer and extends in parallel with each other. 2 stretched tape groups. In FIG. 1, a plurality of second stretched tape 40 groups extending from the lower right to the upper left of the paper surface constitute a second stretched tape group layer. It is preferable that the certain 2nd extending | stretching tape 40 is arrange | positioned substantially parallel to the other adjacent 2nd extending | stretching tape 40 with a predetermined fixed distance. The direction extending from the lower right to the upper left of the second stretched tape 40 is determined so as to form an angle α ′ with respect to the longitudinal direction L that is the stretch direction of the split fiber film 20. The value of α ′ can be determined by those skilled in the art according to its purpose and application. In an exemplary embodiment, α ′ may be the same as α described above. In another embodiment, α ′ may be different from α. For example, the values of α and α ′ can be determined so that α ′ + α becomes a predetermined value. α ′ + α is preferably 30 to 150 °, more preferably 60 to 120 °. For the second stretched tape 40 as well, when the mesh film is not a split fiber film, the angle α ′ is similarly set with respect to the stretching direction of the mesh film.

  In the second stretched tape group layer, the distance between the adjacent second stretched tapes 40 may be the aspect described for the first stretched tape group layer. That is, in a preferred embodiment, in the second stretched tape group layer, the adjacent second stretched tapes 40 may be arranged at substantially equal intervals.

  In a particularly preferred embodiment, the intervals between the adjacent second stretched tapes 40 are substantially equal intervals, and the same approximately equal intervals in the second stretched tape group layer and the first stretched tape group layer. It is. Depending on the interval between the adjacent stretched tapes 30 and 40, the size of the square formed by the two adjacent first stretched tapes 30 and the two adjacent second stretched tapes 40 is changed and laminated. In addition, the number of trunk fibers 20a located in the square can be changed. Moreover, the fiber width of the trunk fiber 20a also changes in the range of about 0.4-2 mm, for example, and / or the trunk fiber 20a space | interval can also change. As an example, the number of the trunk fibers 20a of the split fiber film layer 20 positioned in the square is 1 to 3 in a square having a 9 mm width between adjacent stretch tapes, and 17 in a square having a 55 mm wide adjacent stretch tape interval. It can be set to about 30. Extensibility in the width direction (lateral direction) can be achieved by relatively adjusting the distance between the two adjacent stretched tapes and / or the width of the trunk fiber 20a and / or the distance between the trunk fiber and the trunk fiber. Can be adjusted. In addition, even when the uniaxially stretched network film layer is not a split fiber film layer, the stretch tape interval, the stem fiber width, and the stem fiber interval are similarly adjusted, for example, the extensibility in the longitudinal direction is adjusted. can do.

  About the width | variety of the 2nd extending | stretching tape 40, the aspect demonstrated about the 1st extending | stretching tape 30 may be sufficient. In a preferred embodiment, the width of each second stretched tape 40 is the same in the second stretched tape group layer. In a particularly preferred embodiment, the width of the second stretched tape 40 is the same as the width of the first stretched tape 30. However, the width of the second stretched tape 40 may be different from the width of the first stretched tape 30.

  The layer configuration, thickness, material, and manufacturing method of the second stretched tape 40 may also be the modes described for the first stretched tape 30. In a preferred embodiment, the layer configuration, thickness, material, and manufacturing method of each stretched tape 40 constituting the second stretched tape group layer are the same as those of each stretched tape 30 constituting the first stretched tape group layer. It is. However, the layer configuration, thickness, material, and manufacturing method of the second stretched tape 40 may be different from those of the first stretched tape 30.

  In the reticulated laminated nonwoven fabric 100 according to the present embodiment, the order of lamination of the split fiber film layer 20, the first stretched tape group layer, and the second stretched tape group layer is not particularly limited. For example, the split fiber film layer 20, the second stretched tape group layer, and the first stretched tape group layer may be in this order, and the split fiber film layer 20, the first stretched tape group layer, and the second stretched tape. The order may be the order of the group layers, or the order of the first stretched tape group layer, the split fiber film layer 20, and the second stretched tape group layer. In addition, there is no distinction between the upper and lower sides and the front and back of the net-like laminated nonwoven fabric 100, and the above-mentioned lamination order represents the same meaning even if it is reverse order. In any lamination mode, the layers intersect and are bonded on the contact surface. The mode of bonding may be arbitrary, and for example, it may be bonded by an appropriate adhesive, but it is preferably bonded by thermal welding.

  Next, the network laminated nonwoven fabric according to one embodiment of the present invention will be described from the viewpoint of the manufacturing method. The manufacturing method of a network laminated nonwoven fabric can be implemented using the manufacturing apparatus shown in FIG. 3, for example.

  FIG. 3 is a schematic view showing an example of a production apparatus for producing the reticulated laminated nonwoven fabric 100 according to the present invention. In FIG. 3, the conveyor 1 has pin rows in which the yarn hooking pins 2 are arranged in one longitudinal row at a predetermined pitch on the left and right in the traveling direction, and in the longitudinal direction (longitudinal direction, machine direction) indicated by arrows. proceed. Above it, two sets of parallel tracks 3, 3 'and cylindrical cams 4, 4' crossing the conveyor at a predetermined angle β with respect to the longitudinal direction are provided. The traverse tool 5 supported at both ends by these traverses while maintaining parallelism in the vertical direction along the track by the rotation of the cylindrical cams 4 and 4 ′ to form a first straight rail. The second straight rail 8 intersects the conveyor at a height different from that of the rail and crosses the conveyor at a predetermined angle γ. The yarn feeding guide 7 is attached so as to be movable by linear motion bearings 9 and 9 'loosely engaged with the traverse tool 5 serving as the first rail. On the other hand, one end of the yarn feeding guide 7 is gripped by a linear motion bearing 10 that meshes with the second straight rail 8 so that it can move along the second straight rail 8. The yarn feeding guide 7 traverses along the second straight rail 8 while maintaining parallelism in the vertical direction along the traverse tool 5 (first straight rail). The stitch pattern is determined by the angle β between the second straight rail 8 and the longitudinal direction. Therefore, the angle β may be arbitrary, but usually β = 90 ° is often adopted.

  A yarn feeding guide 7 having a plurality of yarn guide capillaries 6 arranged in one row in the vertical direction at the same pitch as the conveyor pins is mounted integrally with the traverse tool 5, and together with the traverse tool 5, between the left and right pin rows of the conveyor. Make a round trip. Although not shown, the speed of the conveyor 1 and the reciprocating speed of the yarn feeding guide 7 are determined by the driving device so that the same number of pins as that of the thin tubes advance during one reciprocation of the yarn feeding guide 7. . A large number of stretched tapes 30 and 40 supplied to the thin tubes of the yarn feeding guide are respectively zigzag hooked on the left and right pins of the conveyor, and the stretched tape 30 and the stretched tape 40 crossing each other on the conveyor. An oblique body consisting of groups is formed. As shown in FIG. 3, when the angle γ = 90 °, the stretched tape 30 group and the stretched tape 40 group on the conveyor are crossed in the diagonal direction at the same angle with respect to the moving direction of the conveyor. It can be.

  A reticulated film such as the above-mentioned split fiber film layer 20 manufactured by the method described above and widened at a predetermined widening magnification is supplied to the upper or lower surface of the oblique body. The widening magnification may be, for example, about 1.2 to 10 times, and preferably about 2.5 to 8.0 times, but is not limited thereto. A person skilled in the art can appropriately determine the widening magnification according to the specification of the target split fiber film layer 20. In the illustrated embodiment, the first and second stretched tape groups 20 and 40 are hooked on the yarn hooking pin 2 while feeding the split fiber film layer 20 onto the conveyor, and the first and second stretched tape groups are formed. Align and arrange. And while forming an oblique body, it laminates | stacks on the split fiber film layer 20 which mounts on a conveyor and moves to an arrow direction. Alternatively, in another embodiment, an oblique body is formed, and the oblique body and the widened split fiber film layer 20 are laminated immediately before or after the oblique body is removed from the pins of the illustrated apparatus. After the lamination, the intersection of the first stretched tape 30 and the second stretched tape 40 with the trunk fiber 20a and the branch fiber 20b is bonded, preferably heat-sealed, so that the reticulated laminated nonwoven fabric 100 is obtained. Thermal welding can be performed by passing these laminates between rolls heated to a predetermined temperature.

  In the present embodiment, as an example, the method for producing a reticulated laminated nonwoven fabric using the apparatus shown in FIG. 3 has been described, but the method for producing a reticulated laminated nonwoven fabric of the present invention is not limited to a method using a specific apparatus. . In addition to the illustrated apparatus, the reticulated laminated nonwoven fabric according to the present embodiment can be obtained by using an apparatus disclosed in JP 2001-146669 A, a commercially available apparatus, a known apparatus, or a method.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the following examples do not limit the present invention.

  A reticulated laminated nonwoven fabric 100 according to the present invention was produced. The split fiber film 20 having two types of specifications was manufactured by the method described in the above embodiment. Specifically, after the three-layer polyethylene raw film described in detail with reference to FIG. 2 is manufactured, the laminate is uniaxially stretched in the longitudinal direction at a specific stretch ratio described later, and widened to split fibers. Film 20 was obtained. The temperature conditions during stretching were all 95 ° C. The first specification split fiber film has a thickness of 35 μm, a draw ratio of 8 times, and a fiber width of 0.9 mm. The second specification split fiber film has a thickness of 33 μm, a draw ratio of 7 times, and a fiber width of 0.6 mm. there were. On the other hand, a three-layer polyethylene raw film having the same layer structure as the split fiber film 20 was cut into a constant width along the machine direction and stretched 8 times to produce a stretched tape having a width of 1.4 mm. This was designated as a first stretched tape 30 and a second stretched tape 40.

  Using the split fiber film 20, the first stretched tape 30, and the second stretched tape 40, a reticulated laminated nonwoven fabric 100 was formed using the apparatus shown in FIG. The fixed interval between adjacent stretched tape groups was the same for both the first stretched tape group and the second stretched tape group. The angle α formed by the first drawn tape 30 with the drawing direction L of the split fiber film 20 and the angle α ′ formed by the second drawn tape 40 with the drawing direction L of the split fiber film 20 were both 60 °. . While forming the oblique body as described in detail in the embodiment, it is laminated with the fed split fiber film 20 and passed through a roller at 140 ° C., so that these contact points are thermally welded, and the reticulated laminated nonwoven fabric 100 is formed. Manufactured. The layer structure of the reticulated laminated nonwoven fabric 100 is the first stretched tape group layer / the second stretched tape group layer / the split fiber film layer 20, and has a shape as shown in FIG. Met.

  Examples 1-4 used the split fiber film of the said 1st specification whose distance between centers of an adjacent extending | stretching tape is 5 mm, 10 mm, 20 mm, and 30 mm, respectively. In Example 5, the split fiber film of the second specification was used in which the distance between centers of adjacent stretched tapes was 30 mm. The distance between the centers of stretched tapes refers to the distance between the centers in the width direction of adjacent stretched tapes.

  About the network laminated nonwoven fabric of Examples 1-5, the tension test and the measurement of the strain rate were performed. About the tensile test, based on JISL1096, tensile strength and elongation rate were measured about the machine direction (MD) and the width direction (CD). The test piece width was 50 mm × chuck spacing was 100 mm, and the tensile speed was 200 mm / min. On the other hand, the diagonal strength was similarly measured in accordance with JIS L1096 in terms of tensile strength and elongation in the direction of 45 ° C. The test piece width was 50 mm × chuck interval was 200 mm, and the tensile speed was 200 mm / min.

Regarding strain rate, in accordance with JIS L1096, stretchability of stretch fabric: stretch recovery rate and residual strain rate B-1 method, load 5.0N, holding time 1 hour, measure strain rate just before removing load did. The strain rate is obtained by the following equation.
Strain rate = (L ₁ −L ₀ ) / L ₀ × 100 (%)
L ₁ : Length between marks after applying a constant load for 1 hour (mm)
L ₀ : Length between marks when initial load is applied

  The results are shown in Table 1. In Examples 1 to 5, it was found that, in particular, the film has a large extensibility in the width direction, and the value of the strain rate can be adjusted by the stretched tape interval and the specifications of the split fiber film.

  Conventional nonwoven fabrics with such characteristics have never been obtained, and in particular, conventional techniques such as Warif Kraff (registered trademark of JX Nippon Oil & Energy Corporation) and Sof (registered trademark of Sekisui Film Co., Ltd.) In addition to this advantage, it was possible to impart extensibility in the width direction.

  The reticulated laminated nonwoven fabric according to the present invention is useful as sanitary materials such as paper diapers, house wraps, produce bags, automobile interior materials and the like. In particular, it is very useful in applications that require tensile strength, extensibility, and design.

DESCRIPTION OF SYMBOLS 1 Conveyor 2 Threading pin 3 Parallel track 4 Cylindrical cam 5 Traverse tool 6 Thread guide thin tube 7 Yarn feeding guide 8 Second linear rail 9 Linear motion bearing 10 Linear motion bearing 20 Split fiber film (net-like film)
20a trunk fiber 20b branch fiber 20c first thermoplastic resin layer 20d second thermoplastic resin layer 30 first stretched tape 40 second stretched tape 100 reticulated laminated nonwoven fabric

Claims (6)

A uniaxially stretched network film layer comprising trunk fibers extending in parallel with each other, and branch fibers connecting the adjacent trunk fibers;
A first stretched tape group layer composed of a first stretched tape group that is oblique to the stretching direction of the uniaxially stretched network film layer and extends in parallel with each other;
A second stretched tape group consisting of a second stretched tape group obliquely crossing in the stretching direction of the uniaxially stretched network film layer from the direction opposite to the first stretched tape group layer, and extending in parallel with each other;
Name by stacking the Ri
A reticulated laminated nonwoven fabric in which the first stretched tape and the second stretched tape are multilayer polyolefin stretched tapes uniaxially stretched in the longitudinal direction . The uniaxially stretched reticular film layer, dividing the multilayer polyolefin film which is uniaxially stretched in the longitudinal direction繊後, and widening a resulting split fibers film layer, reticulated laminated nonwoven fabric according to claim 1.   The multilayer polyolefin film and the multilayer polyolefin stretched tape were laminated with a layer made of a second thermoplastic resin having a melting point lower than that of the first thermoplastic resin on both surfaces of the layer made of the first thermoplastic resin. The net-like laminated nonwoven fabric according to claim 2, having a layer structure. A plurality of first stretched tapes constituting the first stretched tape group are arranged at substantially equal intervals,
The net-like shape according to any one of claims 1 to 3, wherein a plurality of second stretched tapes constituting the second stretched tape group are arranged at substantially the same intervals as the first stretched tape group. Laminated nonwoven fabric.   The reticulated laminated nonwoven fabric according to any one of claims 1 to 4, wherein the first stretched tape group and the second stretched tape group form an angle of 30 to 150 °. Splitting the multilayer film uniaxially stretched in the longitudinal direction and then widening to obtain a uniaxially stretched network film layer; and
From the uniaxially stretched network film layer, a first stretched tape group layer composed of a first multilayer polyolefin stretched tape group uniaxially stretched in the longitudinal direction, and a second multilayer polyolefin stretched tape group uniaxially stretched in the longitudinal direction A layer of the second stretched tape group, wherein the first stretched tape group is laminated obliquely in the stretching direction of the uniaxially stretched network film layer, and the second stretched tape group Are obliquely laminated in the stretching direction of the uniaxially stretched network film layer from the opposite direction to the first stretched tape group,
6. The method according to claim 2, further comprising a step of adhering the uniaxially stretched network film layer, the first stretched tape group layer, and the second stretched tape group layer at their intersection. The manufacturing method of the net-like laminated nonwoven fabric as described in 2 .