TWI625437B - Composite nonwoven fabric - Google Patents

Abstract

The present invention provides a composite nonwoven fabric which can improve softness, flexibility, hand feeling, and can be expanded to applications which have not been previously used.

The composite nonwoven fabric includes a mesh-shaped reinforcing support layer 1 which is formed by uniaxially orienting the uniaxially oriented bodies 2 and 3 via the first or second subsequent layers so that the orientation axes 2a and 3a intersect each other. The orientation bodies 2 and 3 include a thermoplastic resin layer and a first and second adhesive layer which are laminated on both surfaces of the thermoplastic resin layer and have a lower melting point than the thermoplastic resin; and a mesh layer which is entangled by the water needle method for strengthening The support layer is composed of short-fiber cellulose fibers or synthetic fibers; the mesh layer and the reinforcing support layer are integrated. The basis weight of the reinforcing support layer is 5 to 13 g/m ² , and the layer composition ratio of the first adhesive layer, the thermoplastic resin layer, and the second adhesive layer in the uniaxially oriented body is 20/60/20 to 30/40/30. The average value of the bending resistance measured by the cantilever method is 50 mm or less.

Description

Composite non-woven fabric

The present invention relates to a composite nonwoven fabric in which fibers of a mesh layer are entangled in a reinforcing support layer by a spunlace method, and the mesh layers are integrated with the reinforcing support layer.

Patent Document 1 discloses a reinforced non-woven fabric in which a fiber layer of a mesh layer composed of short fiber-like cellulose fibers or synthetic fibers is entangled in a reinforcing support layer by a water needle method, thereby forming a mesh layer. Integrated with the enhanced support layer. Since the reinforcing support layer of the reinforced non-woven fabric is formed of an air permeable oriented body, the tensile strength and the tensile strength of the longitudinal and transverse directions are excellent, and the flexibility, texture, and the like are also excellent. Moreover, it is widely used for industrial materials such as filter cloths and industrial rags, and medical disposable products such as surgical gowns, sheets, towels, and masks.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Laid-Open Patent Publication: JP-A-8-158233

However, since the above-mentioned reinforced non-woven fabric has high strength and toughness, it is desired to improve the softness, flexibility, and hand feeling as a product that is in direct contact with the human body. Moreover, in the use of the rag for the object, there is a requirement that the dust is to be further improved. Capturing or erasing properties of deposits such as scale or oil.

However, even if you use a commercially available split fiber non-woven fabric (split fiber) Nonwoven), such as the lightest and softest product of Warifu (registered trademark) or CLAF (registered trademark) manufactured by JX Nippon Oil & Energy Corporation, as a strengthening support layer, is still difficult A composite nonwoven fabric that satisfies the desired softness, flexibility, and hand feel is produced. The reason for this is that the split fiber nonwoven fabric has rigidity, and therefore, when the water flow of the mesh layer is hydroentangling by the water needle method, the jet water flow may splash, resulting in the fiber not being sufficiently entangled. Therefore, the fibers of the mesh layer are difficult to be entangled in the flat mesh portion of the split fiber nonwoven fabric, resulting in uneven mesh layers. As a result, a pattern of the reinforcing support layer appears on the surface of the composite nonwoven fabric, and the flexibility or flexibility, the hand feeling deteriorates, and it is not durable.

The present invention has been made in view of the circumstances as described above, and its object is to provide A composite non-woven fabric that can improve softness, flexibility, and feel, and can be expanded to previously unusable uses.

According to one aspect of the present invention, there is provided a composite nonwoven fabric comprising: a mesh-shaped reinforcing support layer which is formed by uniaxially orienting a uniaxially oriented body via a first or second subsequent layer by intersecting the orientation axes The uniaxially oriented body comprises a thermoplastic resin layer, and the first and second subsequent layers laminated on both sides of the thermoplastic resin layer and having a lower melting point than the thermoplastic resin; the mesh layer is entangled by a water needle method The short fiber-like cellulose fiber or synthetic fiber of the reinforcing support layer; the mesh layer and the reinforcing support layer are integrated; the reinforcing support layer has a basis weight of 5 to 13 g/m ² , and the uniaxial axis The layer composition ratio of the first back layer, the thermoplastic resin layer, and the second back layer in the oriented body is 20/60/20 to 30/40/30, and the reinforcing support layer has a cantilever in the longitudinal direction and the width direction. The average value of the bending resistance measured by the cantilever method is set to 50 mm or less.

According to the present invention, since the bending resistance of the reinforcing support layer is as low as 50 mm or less, the jet water flow when the fiber stream of the mesh layer is entangled by the water needle method tends to cause the fiber to be entangled in the reinforcing support layer, and The fibers are sufficiently entangled. Further, since the basis weight of the reinforcing support layer is as light as 5 to 13 g/m ² , the entangled fibers can be increased. Thereby, the flexibility, flexibility, and hand feeling can be improved, and the use can be expanded to a previously unusable use.

1‧‧‧Strengthen support layer

2‧‧‧ fork network

2a‧‧‧Orientation axis

3‧‧‧Slit net

3a‧‧‧Orientation axis

4‧‧‧Dry fiber

5‧‧‧ branch fiber

6, 6'‧‧‧ thermoplastic resin layer

7-1, 7-1'‧‧‧Next layer

7-2, 7-2'‧‧‧Next layer

Fig. 1 is a plan view showing a reinforcing support layer used in a composite nonwoven fabric according to an embodiment of the present invention.

Fig. 2A is a perspective view showing a configuration example of a uniaxially oriented body constituting the reinforcing support layer shown in Fig. 1;

Fig. 2B is a perspective view showing a part of Fig. 2A in an enlarged manner.

Fig. 3A is a perspective view showing a configuration example of a uniaxial alignment body constituting the reinforcing support layer shown in Fig. 1;

Fig. 3B is a perspective view showing a part of Fig. 3A in an enlarged manner.

Fig. 4 is a perspective view showing a method of manufacturing the uniaxial alignment body shown in Figs. 2A and 2B.

Fig. 5 is a perspective view showing a first manufacturing method of the reinforcing support layer shown in Fig. 1;

6 is a view for explaining a method of manufacturing a composite nonwoven fabric, and is a schematic view showing an example after the supply step, and the composite nonwoven fabric is formed using the manufacturing method shown in FIGS. 4 and 5. Strengthen the support layer.

Fig. 7 is a view for explaining a study based on a sample in which the basis weight of the reinforced laminated body, the layer constitution ratio of the uniaxially oriented body, and the bending resistance measured by the cantilever method are changed.

Fig. 8 is a characteristic diagram showing the relationship between the basis weight of the reinforcing support layer and the bending resistance by the cantilever method.

9 is a view for explaining an opening ratio, a tensile strength of a substrate, a bending resistance of a substrate, and a bending resistance of a reinforcing support layer when the basis weight of the substrate is changed and the basis weight of the mesh layer is fixed. Evaluation chart.

Fig. 10 is a view for explaining the aperture ratio, the tensile strength of the substrate, the bending resistance of the substrate, the bending resistance of the reinforcing support layer, and the evaluation of the bending resistance of the reinforcing support layer when the basis weight of the base material and the mesh layer are fixed.

Fig. 11 is a perspective view showing a second manufacturing method of the reinforcing support layer shown in Fig. 1;

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the composite nonwoven fabric according to the embodiment of the present invention, a mesh layer composed of short-fiber cellulose fibers or synthetic fibers is entangled in a reinforcing support layer by a water needle method, and a mesh layer and a reinforcing support layer are integrated. When the water flow method is used to entangle the fiber water of the mesh layer, the jet water flow is splashed due to the rigidity of the split fiber non-woven fabric, and the fiber cannot be sufficiently entangled. The present invention focuses on this point by making the reinforcing support layer It has softness or flexibility, which makes the fibers of the mesh layer easy to entangle. Therefore, first, a configuration and a manufacturing method of the reinforcing support layer which is one of the features of the present embodiment will be described. Next, a method of manufacturing the composite nonwoven fabric in which the mesh layer is entangled with the reinforcing support layer will be described.

[Structure of enhanced support layer]

The reinforcing support layer 1 shown in Fig. 1 is formed by a non-woven fabric which is a split net (split) The orientation axis 2a of the web) 2 and the orientation axis 3a of the slit web 3 intersect with each other to form a warp and weft. Further, the contact portions of the adjacent branching net 2 and the slit net 3 are joined to each other in a face-to-face manner.

2A and 3A show the points constituting the reinforcing support layer 1 shown in Fig. 1, respectively. The fork mesh 2 and the slit mesh 3. The bifurcated web 2 shown in FIG. 2A is formed by uniaxially stretching a film made of a thermoplastic resin in the longitudinal direction (the axial direction of the orientation axis 2a of the bifurcated web 2), and dividing the fiber in the longitudinal direction and widening it. A thermoplastic resin such as high-density polyethylene and a thermoplastic resin having a melting point lower than the thermoplastic resin such as first and second low-density polyethylene are used in the furcation net 2 .

In detail, the multilayer film (uniaxially oriented body) is oriented in the longitudinal direction (longitudinal direction) The multilayer film is formed by a multilayer T-die method or the like at least three times, and the first and second low-density polyethylenes are formed in the two-layer layer of the high-density polyethylene. Thereafter, the splitter is split in the same direction by a splitter (fiber splitting) to form a mesh film, and the mesh film is widened to a predetermined width to form the split net 2 . The dry fiber 4 and the branch fiber 5 are formed by widening to form a mesh body as shown. The furcation web 2 has a high strength in the longitudinal direction over the entire width direction.

Fig. 2B is an enlarged perspective view of a region B surrounded by a chain line in Fig. 2A. Minute The cross net 2 has a three-layer structure, that is, a thermoplastic resin layer 7-1, 7-2 having a melting point lower than that of the thermoplastic resin in the two-layer layer of the thermoplastic resin layer 6. When the reinforcing resin layer 7-1 and 7-2 are formed, the thermoplastic resin layers 7-1 and 7-2 function as an adhesive layer (first and second adhesive layers) of the mesh when the warp and weft are laminated together with the slit mesh 3.

The slit net 3 shown in Fig. 3A is in the lateral direction (the orientation axis 3a of the slit net 3) The axial direction) is such that a film made of a thermoplastic resin has a plurality of slits and then uniaxially extends in the lateral direction. form. Specifically, the slit net 3 is attached to a portion other than the ear portions of the multilayer film, and an intermittent slit such as a cross slit is formed in parallel in the lateral direction (width direction) by, for example, a hot knife. It is formed by extending in the lateral direction. The slit mesh 3 has a higher strength in the lateral direction.

Fig. 3B is an enlarged perspective view of a region B surrounded by a chain line in Fig. 3A. narrow The slit net 3 has a three-layer structure in which the two-layer layers of the thermoplastic resin layer 6' have a thermoplastic resin layer 7-1', 7-2' having a lower melting point than the thermoplastic resin. When the reinforcing resin layers 7-1' and 7-2' are formed in the reinforcing support layer 1, the thermoplastic resin layers 7-1' and 7-2' are formed as an adhesive layer (first and second adhesive layers) of the net when the cross-linked web 2 is woven with the cross-web. Features.

The reinforcing support layer 1 has a basis weight of 5 to 13 g/m ² , and the thermoplastic resin layers 7-1 and 7-1' in the uniaxially oriented body (the bifurcated web 2 and the slit net 3) (the first subsequent layer) The layer composition ratio of the thermoplastic resin layers 6, 6' and the thermoplastic resin layers 7-2 and 7-2' (second back layer) is 20/60/20 to 30/40/30. The average value of the bending resistance measured by the cantilever method in the longitudinal direction (MD) and the width direction (CD) is 50 mm or less.

[Manufacturing method of strengthening support layer]

Next, a method of manufacturing the reinforcing support layer 1 shown in Figs. 1, 2A, 2B, 3A, and 3B will be described with reference to Figs. 4 and 5 . Fig. 4 shows an outline of a manufacturing procedure of the furcation net 2. Moreover, FIG. 5 shows the outline of the step of laminating the slit net 3 to the branching net 2 to manufacture the reinforcing support layer 1.

As shown in FIG. 4, the film forming step through the multilayer film, the orientation step of the multilayer film, The furcation web 2 is produced by a bifurcation step of bifurcating the oriented multilayer film in parallel with the orientation axis, a winding step of winding the bifurcated film winding, and the like.

In this example, the film forming step of the multilayer film is in the extruder 10, which will melt the tree. The fat is a thermoplastic resin having a low melting point functioning as the first and second adhesive layers, for example, low-density poly Ethylene, and a thermoplastic resin layer such as high density polyethylene are respectively fed into respective manifolds in the flat mold. The resin is joined and joined to form the multilayer film 11 just before reaching the lip. The flow rate adjustment of each molten resin or the adjustment of the thickness of the product is carried out by adjustment of a choke bar or a lip in the mold.

In the aligning step, the multilayer film 11 is passed through a mirror-finished chill roll Between 12a, 12b, the roller orientation is performed at a given orientation magnification with respect to the initial size.

In the bifurcation (fiber division) step, the above-mentioned oriented multilayer film 11 is The splitter (rotary knife) 13 that rotates at a high speed is in sliding contact, and the multilayer film 11 is subjected to a bifurcation process (fiber division).

After the bifurcated web 2 formed by dividing the fiber is widened to a predetermined width, the heat is passed through The heat treatment in the management unit 14 is wound into a predetermined length in the winding step to form the wound body 15 of the furcation net 2 .

As shown in FIG. 5, the lateral web (slit net 3) is laminated in the above manner. The vertical web (forked net 2) that the winding body 15 sends out. The manufacturing process of the lateral web includes a film forming step of the multilayer film, a slit step of performing slit processing at right angles to the longitudinal direction of the multilayer film, and an orientation step of the multilayer slit film. Next, the vertical net is laminated on the horizontal web to perform thermocompression bonding (pressure bonding step).

The film forming step of the multilayer film for the slit net 3 is in the same manner as the multilayer film 11 In the outlet 20, a molten resin, that is, a thermoplastic resin having a low melting point functioning as the first and second adhesive layers, for example, a low-density polyethylene, and a thermoplastic resin layer such as high-density polyethylene are respectively fed into the flat mold. Manifold. The resin is joined and joined to form the multilayer film 21 just before reaching the lip. The flow rate adjustment of each molten resin or the adjustment of the thickness of the product is carried out by adjustment of a choke bar or a lip in the mold.

In the slit step, the above-mentioned formed multilayer film 21 is sandwiched to make it flat Then, the multilayer film 21 is horizontally oriented by rolling, and the transverse slits are produced at right angles to the direction of travel.

In the orientation step, the transverse direction step 23 is used to perform the above slit The film 21 is oriented in a transverse direction. The slit web 3 (horizontal web) obtained in this manner is transferred to the thermocompression bonding step 24.

On the other hand, the web is fed from the web feed roller 25 to the vertical net (forked net 2) to make the vertical The net (forked net 2) travels at a predetermined supply speed and conveys it to the widening step 26, which is widened by a widening machine (not shown) several times, and then heat-treated as needed. Thereafter, the vertical web is conveyed to the thermocompression bonding step 24, in which the vertical web and the cross web are laminated so as to intersect each other with the orientation axes, and thermocompression bonding is performed. Specifically, the vertical net 2 and the horizontal net 3 are sequentially guided between the hot cylinder 24a having the mirror surface on the outer peripheral surface and the mirror rollers 24b and 24c, and a clamping pressure is applied to the nets, thereby making these The nets are thermocompressed and integrated with each other. Thereby, the contact portions of the adjacent vertical net 2 and the horizontal net 3 are completely surface-to-face. The vertical net and the horizontal net integrated in this manner are conveyed to the winding step and wound to form the wound body 27 of the reinforcing support layer 1.

[Manufacturing method of composite non-woven fabric]

Next, the following method will be described in detail, in which the mesh layer is entangled in the above-mentioned reinforcing support layer 1 by a water needle method, and the mesh layer and the reinforcing support layer are integrated to manufacture a composite nonwoven fabric. The manufacturing method includes a mesh layer forming step, a supply step of the supply mesh layer and the reinforcing support layer, a high pressure water flow entanglement step of performing water jet treatment, a drying step, and a product winding step.

First, in the step of forming the mesh layer, it is used according to the type of the raw material and the end use. Various forms are used as the arrangement or formation method of the net. As the characteristics of the net, it is required to have fibers in the plane The distribution is uniform, and as the fiber arrangement of the net, (1) a comb-like parallel method using a mechanical card forming method arranged two-dimensionally in the longitudinal direction, and (2) a mechanical cross-over which is arranged by crossing in an oblique direction a carding cross-layer method of mesh forming, (3) a semi-random method using a semi-random mechanical arrangement of two-dimensional and three-dimensional intermediates, and (4) three-dimensionally scattered by an air laid network forming method In a random manner of arranging or the like, the airflow forming method refers to a method in which a fiber is floated by blowing, and then accumulated on a mesh screen to form a mesh.

Moreover, the method of forming the mesh varies depending on the type of the raw material. When cutting to regeneration When a fiber or the like is subjected to spinning by wet spinning or spinning by melt spinning of a synthetic fiber by a usual method to form a raw material, a method is employed in which a fiber comb is combed by a carding machine. Form a net. When the yarn is obtained by the melt blow method, a method of directly forming the web is used. Further, there is a method of forming a net by combing natural fibers with a card, or a wet web forming method of pulverizing natural fibers and performing papermaking.

When an example of the short fibers of the above-mentioned mesh layer is cited, there is a short-fiber cellulose system. Fiber (natural fiber), or synthetic fiber (including core sheath fiber) such as polyethylene terephthalate (PET) or polypropylene (PP).

Fig. 6 is a view showing an example of the steps after the supply step in the above step. Sketch map. In the supply step, the mesh layer 41 fed from the supply roller 41a is supplied to the upper surface of the reinforcing support layer 1 fed from the supply roller 42a, or the mesh layers 41, 41' from the supply rollers 41a, 41a' are supplied to the reinforcement. Support both sides of layer 1. Alternatively, the reinforcing support layer 1 fed from the supply roller 42a is superposed on the mesh layer directly supplied from the mesh layer forming step, and supplied to the subsequent high-pressure water flow entanglement step.

In the next high-pressure water entanglement step, as a treatment water permeability or not On the sieve or roller of the transfer support body 43, the finer plural from the high pressure water jet ejector 45 The water stream 45a is sprayed onto the layer 44 of the mesh layer to be supplied and the reinforcing support layer. In addition, when the high-pressure water stream is sprayed, if the overlapping mesh layer and the reinforcing support layer are mutually displaced or both are peeled off due to the energy of the high-pressure water flow, the entanglement treatment lacks stability, and a uniform composite having excellent physical properties cannot be obtained. Not woven. Therefore, it is preferable to immerse the above-mentioned laminated body in the water 46a in advance in the water immersion device 46 before the water flow is sprayed. Further, it is preferable that the water suction device 47 provided with a vacuum suction means or the like is used to suction and remove water after the water jet is sprayed, thereby improving the drying efficiency.

In the above high pressure water flow entanglement step, when high pressure water flow treatment is performed on the sieve In the meantime, the sieve is not particularly limited. However, in order to facilitate the discharge treatment of the treated water, it is preferred to select a material, a pore diameter, a wire diameter, and the like for the purpose of blending or use. The sieve has a pore size of usually 20 to 200 mesh. In the method of using the water-permeable transfer support, since the treated water is easily discharged, it is possible to prevent the net from scattering due to the injection of the water flow, thereby causing the uniformity to be impaired. However, there is still a large amount of energy remaining in the treated water after passing through the net, so the energy utilization efficiency is not high. On the other hand, in the method of using the water-impermeable transfer support, the jet of water that has passed through the mesh collides with the transfer support to become a rebound flow and act on the mesh again. The entanglement is efficiently performed by the interaction of the jet stream and the rebound stream. However, since it is in a state of ejecting a high-pressure water stream to a net suspended in water, the stability of entanglement is lowered. Among these methods, a method of performing a high-pressure water jet blasting treatment on a water-permeable transfer support is considered in consideration of a stable composite treatment and a uniform composite nonwoven fabric.

The pressure of the jet stream is 10 to 300 kg/cm ³ , preferably 60 to 150 kg/cm ³ . Since the reinforcing support layer 1 has low bending resistance, the net can be entangled even if the pressure is low, but if the pressure is less than 10 kg/cm ³ , the entanglement effect is insufficient. Further, when it exceeds 300 kg/cm ³ , the cost of generating a high-pressure water stream increases, and it is difficult to carry out the operation, which is not preferable. The spraying is performed once or more, preferably by three times of spraying. That is, it is possible to separately use the injection of high pressure and large amount of water for the purpose of entanglement, the injection of low pressure and small amount of water for surface finishing, and the injection between the two. The shape of the high-pressure fluid is not particularly limited, but the columnar flow is preferable in terms of energy efficiency. The cross-sectional shape of the columnar flow is determined by the cross-sectional shape of the nozzle or the internal structure of the discharge port of the nozzle, and can be freely selected depending on the material, purpose, use, and the like of the mesh. The processing speed of the high pressure water jet is 1 to 150 m/min, preferably 20 to 100 m/min. If the treatment speed is less than 1 m/min, the productivity is low, and if it exceeds 150 m/min, the entanglement effect is insufficient, and thus it is not preferable.

When the reinforcing support layer 1 is used as a substrate, the weight per unit area of the water-entangled mesh layer is preferably 10 to 250 g/m ² when entangled on one or both sides of the reinforcing support layer 1 , more preferably It is 20~100g/m ² . If the weight per unit area is less than 10 g/m ² , the fiber density may be uneven during the high-pressure water treatment, and if it exceeds 250 g/m ² , the density may be too dense and the formability may be poor, which may also result in economical reasons. The cost is increasing, so it is not good. When the basis weight of the reinforcing support layer 1 used as the reinforcing material is 5 to 13 g/m ² , the strength of the composite nonwoven fabric after the water flow is entangled can be improved. The basis weight of the mesh layer which can significantly exert the reinforcing material action is preferably from 20 to 100 g/m ² .

Secondly, the mesh layer and reinforcement after entanglement by spraying high-pressure water flow The laminate body of the support layer is supplied to the drying step, and in the drying step, it is dried by, for example, an oven 48, a hot air furnace or a hot cylinder. Further, the dehydration may be carried out by suction or the like before drying, or may be contracted in the drying step. The non-woven fabric dried in this manner is wound into a composite nonwoven fabric 49 in the product winding step, and becomes a product.

In the above drying step, the substrate can be used to strengthen the branch by adjusting the temperature. The heat shrinkage of the layer 1 causes the surface to have a concavo-convex structure, so that a large composite nonwoven fabric can be produced. When a large composite non-woven fabric is used as a rag, it has the following advantages: when used for a person, it has a good hand feeling, and when used for a thing, it can easily catch dust and the like.

[verification]

When the water-needle method is used to entangle the fiber water of the mesh layer, the jet stream is splashed, and the inventors of the present invention have focused on this, and are prepared to change the basis weight of the laminated body 1 and the layer composition ratio and length of the uniaxially oriented body. A sample of the average value of the bending resistance measured by the cantilever method in the direction and the width direction was examined. Further, it was confirmed that the mesh layer was entangled by a water needle method to achieve flexibility, flexibility, hand feeling, and the like when the mesh layer and the reinforcing support layer were integrated. As a result, the following findings were obtained.

In Figure 7, in sample number S8, use JX Nippon Mining & Energy Co., Ltd. The product number 3S (T) of the segmented fiber non-woven fabric called Warifu (registered trademark) manufactured by the company is Comparative Example 1, and the same product number S (F) EL is used as the comparative example 2 in the sample No. S9, in the sample No. S10. In the same, the same product number HS (T) was used as Comparative Example 3.

The unit weight of sample No. S8~S10 is 18~35 g/m ² , the ratio of high density polyethylene is high (74~78%), and the layer composition ratio becomes 13/74/13~11/78. /11. Therefore, strength (tensile strength) or durability is high and toughness. However, without softness or flexibility, the average value of the bending resistance measured by the cantilever method is as high as 63 to 78 mm.

On the other hand, the unit weight of the sample numbers S1 to S7 is a light weight of 4 to 13 g/m ² , and the average value of the bending resistance measured by the cantilever method is 6 to 55 mm. The sample numbers S1 to S7 are soft and flexible, and the hand feel is also good. However, in the case of the sample number S1 having a basis weight of 4 g/m ² , the tensile strength in the longitudinal direction (MD) is MD = 18 (N / 50 mm), and the tensile strength in the width direction (CD) is CD = 15 (N/50 mm), all of which are 20 N/50 mm or less, which does not satisfy the practical strength as a reinforcing support layer.

Further, in the sample numbers S4 to S6, the unit area weight was fixed (10 g/m ² ) to change the layer constitution ratio, and the sample numbers S4 and S5 were not able to satisfy the flexibility, the flexibility, and the hand feeling. The reason is generally considered to be that the ratio of the high-density polyethylene of the sample numbers S4 and S5 is high, and the average value of the bending resistance measured by the cantilever method is 55 mm and 52 mm, respectively, and has toughness.

Fig. 8 is a view obtained by extracting and plotting the average value of the basis weight and the bending resistance of Fig. 7 described above. According to Fig. 8, it can be seen that the weight per unit area has an inflection point of about ten g/m ² , and it can be inferred that the flexibility, the flexibility, the hand feeling, and the like are changed.

According to the measurement results of FIGS. 8 and 7, it is known that the reinforcing support layer is preferably 5 to 13 g/weight in order to obtain flexibility, flexibility, and hand feeling, and to obtain practical strength (tensile strength). Within the range of m ² . Further, the layer composition ratio obtained as a preferable result is 26/48/26. However, considering the data of other sample numbers or the layer composition ratio of various commercially available products, it is generally considered that there is no change of about several %. In a hurry, the preferred layer composition ratio is 20/60/20~30/40/30. Further, the average value of the bending resistance measured by the cantilever method was 50 mm or less. The sample numbers S2, S3, S6, and S7 satisfying the above conditions as the reinforcement support layer become a reinforcement support layer capable of achieving the desired purpose in a different manner.

Moreover, the above sample numbers S2, S3, S6, and S7 are thinner than 80 μm. The aperture ratio is higher than 50%. It has been confirmed that if it is in such a numerical range, flexibility (bending resistance) and strength can be achieved, and flexibility can be further improved by making the thickness thin. Further, in the above-described production step, in order to increase the tensile strength of the reinforcing support layer 1 to 20 N/50 mm or more, it is preferable to set the stretching ratio of the multilayer films 11 and 21 to 3 or more.

The reinforcement support layer that fully satisfies the above conditions is as shown in the embodiment of FIGS. 9 and 10. As shown, the fibers are easily entangled due to being soft, and if the weight per unit area is fixed, the amount of the net entangled by the water flow can be increased because of the light weight.

Fig. 9 shows the evaluation of the aperture ratio, the tensile strength of the substrate, the bending resistance of the substrate, and the completed reinforcing support layer 1 when the basis weight of the reinforcing support layer 1 is 10 g/m ² . Comparative Examples 1 and 2 are product number HS (T) and product number 3S (T) in Warifu (registered trademark) manufactured by JX Nippon Mining Co., Ltd., respectively. Here, cotton is used as a net, and the net is entangled on both sides of the reinforcing support layer 1, the article number HS (T), and the article number 3S (T). In all the samples, the amount of cotton was set to 30 g.

As shown in FIG. 9, for HS (T), the core material is a table of the reinforcing support layer 1. The surface bounces the jet of water, and the entanglement of the cotton is somewhat uneven and not durable. For 3S (T), the surface of the core material, that is, the surface of the reinforcing support layer 1, also bounces the jet of water to a certain extent. Therefore, the entanglement of the cotton is insufficient, and unevenness and insufficientness are also generated. In contrast, in the case of the embodiment, the cotton is uniformly and perfectly entangled. Thus, the lighter the basis weight, the better the entanglement of the cotton, and the entanglement unevenness of the examples is the least.

Fig. 10 is a view showing an aperture ratio, a tensile strength of a substrate, and a bending resistance of a substrate when the sum of the weight per unit area of the reinforcing support layer 1 and the mesh layer is 55 g/m ² , and the completed reinforcing support layer 1 Evaluation. In the same manner as in Fig. 9, the product number HS (T) and the product number 3S (T) were used as Comparative Examples 1 and 2, respectively. Here, cotton is also used as the net, and the net is entangled on both sides of the reinforcing support layer 1, the product number HS (T) and the product number 3S (T).

As shown in Fig. 10, for HS (T), the amount of cotton is small, and the core material is strengthened. The surface of the support layer 1 bounces off the jet of water, and the entanglement of the cotton is somewhat uneven and not durable. For 3S(T), the surface of the core material, that is, the reinforcing support layer 1, bounces the jet stream to a certain extent. Therefore, the entanglement of the cotton is insufficient, and unevenness and insufficientness are also generated. In the examples, the cotton is evenly and perfectly entangled. Thus, with respect to the reinforcing support layer 1, the larger the basis weight of the mesh layer, the better the entanglement of the cotton, and the entanglement unevenness of the embodiment is the least.

In addition, as shown in FIG. 9 and FIG. 10, 3S(T) and the embodiment are in phase with the sample S1. In comparison, the MD fiber is thinned, and it can be inferred that since the fiber is fine, it is not easy to bounce off the jet stream. Therefore, the width of the fiber of the reinforcing support layer 1 is such that the thickness of the necessary tensile strength can be ensured, and it is finer than 0.92 mm.

As described above, the basis weight of the reinforcing support layer is 5 to 13 g/m ² , and the layer composition ratio of the first adhesive layer, the thermoplastic resin layer, and the second adhesive layer in the uniaxially oriented body is 20/60/20 to 30. /40/30. Further, the average value of the bending resistance measured by the cantilever method is 50 mm or less, and a mesh layer composed of short fiber-like cellulose fibers or synthetic fibers is entangled in the reinforcing support layer by a water needle method. A composite nonwoven fabric is produced, whereby the flexibility, flexibility, and hand feeling can be improved, and the use can be expanded to a previously unusable use.

<Modification 1>

Fig. 11 is a view for explaining a modification of the above-described reinforcing support layer, and shows another manufacturing method. The reinforcing support layer is provided with two reinforcing support layers of the split net 2 shown in FIG. 2A and FIG. 2B. The web (the bifurcation net 2-1) manufactured in the manner shown in Fig. 4 is sent out from the web feeding roller 30, and the vertical web (the bifurcation net 2-1) is advanced at a predetermined supply speed, and After being conveyed to the widening step 31, the width is increased by a plurality of times by a widening machine (not shown), and then heat treatment is performed as needed.

Similarly to the vertical net, the coil feeding roller 32 sends out another furcation net 2-2 (horizontal The other forked web 2-2 (horizontal web) is advanced at a predetermined supply speed and transported to the widening step 33, which is multiplied by a widening machine (not shown). After heat treatment as needed, The length is equal to the width of the vertical net, and is supplied to the other furcation net 2-2 (horizontal net) from a direction perpendicular to the traveling film of the vertical net, and in the laminating step 34, via each of the subsequent layers. The warp and weft layers are formed in such a manner that the orientation axes of the respective nets are orthogonal to each other. In the thermocompression bonding step 35, the vertical web and the horizontal web after the warp and weft are sequentially guided to between the mirror-shaped hot cylinder 35a and the mirror rollers 35b and 35c, and a nip pressure is applied. Thereby, the vertical net and the horizontal net are thermocompression bonded to each other and integrated. Further, the contact portions of the adjacent vertical web and the horizontal web are completely surface-to-face. The vertical net and the horizontal net integrated in this manner are wound in the winding step to form a wound body 36 of the warp and weft laminated nonwoven fabric.

The reinforcing support layer produced in the above manner also satisfies the same basis weight (5 to 13 g/m ² ) and layer composition ratio (20/60/20 to 30/40/30) as in the first embodiment, and cantilever method. The same effect can be obtained by measuring the average value of the bending resistance (50 mm or less). In this case, the thickness is also thinner than 80 μm, and the aperture ratio is also higher than 50%.

<Modification 2>

In the case where the above-mentioned uniaxially oriented warp and weft laminate has the split net 2 and the slit net 3, it is also possible to form two layers of parallel uniaxially oriented belts to form a composite nonwoven fabric. In this case, the warp and weft layers are formed in such a manner that the orientation axes of one set of the uniaxially oriented strips and the orientation axes of the other set of the uniaxially oriented strips are orthogonal to each other. A uniaxially oriented belt is used which aligns a three-layer film in a longitudinal direction or a transverse direction and cuts it to form a uniaxially oriented belt of a multi-layered stretch belt, the three-layer film and the split net 2 and the narrow Similarly to the sewn net 3, the two-layer layer of the thermoplastic resin layer has a melting point lower than that of the first and second subsequent layers (thermoplastic resin) of the thermoplastic resin.

Thus, in the case where the two layers of the laminate are arranged in parallel, the strip formed by the uniaxially oriented belt is arranged. In the meantime, the same effects as the unit weight of the unit area, the layer constitution ratio, and the average value of the bending resistance measured by the cantilever method are satisfied. Therefore, the same effects can be obtained. Of course, thick The degree is thinner than 80 μm, and the aperture ratio is higher than 50%.

According to the composite nonwoven fabric having the above configuration, it is possible to improve the softness, flexibility, and hand feeling as a product which is in contact with a human body such as a medical disposable product. Further, for example, when used as a rag for a person such as an antiperspirant tablet, a makeup remover, or a sweat jersey, the same effect can be obtained. Further, in the case of using a rag such as a rubbing cloth, a wiping cloth, or a kitchen towel as a factory, it is possible to further improve the catching property or the erasing property against deposits such as dust or oil.

Claims (5)

A composite non-woven fabric comprising: a mesh-shaped reinforcing support layer formed by uniaxially orienting a uniaxially oriented body via a first or second adhesive layer, wherein the uniaxially oriented body comprises thermoplastic a resin layer and the first and second subsequent layers laminated on both sides of the thermoplastic resin layer and having a melting point lower than the thermoplastic resin; and a mesh layer which is entangled with the short fibers of the reinforcing support layer by a water needle method The cellulose-based fiber or the synthetic fiber; the mesh layer and the reinforcing support layer are integrated; the composite nonwoven fabric is characterized in that the reinforcing support layer has a basis weight of 5 to 13 g/m ² , and the uniaxial orientation The layer composition ratio of the first adhesive layer, the thermoplastic resin layer, and the second adhesive layer in the body is 20/60/20 to 30/40/30, and the longitudinal direction and the width direction of the reinforcing support layer are by a cantilever method. The average value of the measured bending resistance was set to 50 mm or less. The composite nonwoven fabric of claim 1, wherein the thermoplastic resin layer comprises high-density polyethylene, and the first and second adhesive layers each comprise low-density polyethylene. The composite nonwoven fabric of claim 1 or 2, wherein the reinforcing support layer has a fiber having a width smaller than 0.92 mm. The composite nonwoven fabric of claim 1 or 2, wherein the reinforcing support layer has an aperture ratio of more than 50%. The composite nonwoven fabric of claim 3, wherein the reinforcing support layer has an aperture ratio of more than 50%.