JP7324014B2 - Composite type nonwoven fabric and its manufacturing method - Google Patents

Description

The present invention relates to a composite nonwoven fabric obtained by hydroentangling a pulp fiber web and a spunbond nonwoven fabric.

A composite nonwoven fabric composed of a pulp fiber web and a spunbond nonwoven fabric has both liquid absorbency based on the pulp fiber and strength based on the spunbond nonwoven fabric, so it can be used for industrial wipers such as waste cloths, washcloths, and towels. It is widely used in various applications such as personal wipers such as.

For example, as disclosed in Patent Document 1, a pulp fiber web and a spunbond nonwoven fabric are laminated and then integrated by a hydroentanglement treatment in which a high-pressure water jet is applied. Since the spunbond nonwoven fabric is excellent in strength, it functions as a backing layer for the manufactured composite nonwoven fabric. On the other hand, pulp fiber webs have an excellent liquid absorption function. Therefore, such a composite nonwoven fabric is an excellent composite type that has both the advantages of a pulp fiber web that has good absorbency for both aqueous and oily liquids and the spunbond nonwoven fabric that has excellent strength. It can be provided to the consumer as a nonwoven fabric.

Japanese Patent No. 2533260

The spunbond nonwoven fabric used in Patent Document 1 and the like (referred to as a nonwoven continuous filament support in Patent Document 1) is widely obtained by spunbonding a synthetic resin such as polypropylene. Adopted. In the spunbonding process, spun resin fibers are connected to each other at a plurality of points by fused portions (hereinafter referred to as fused points). As a result, the spunbond nonwoven fabric develops sheet strength and maintains its outer shape.

The fusion points are welded portions where the resin fibers are melted and solidified, are dispersed throughout the spunbond nonwoven fabric, and are an important component for obtaining the strength of the spunbond nonwoven fabric. The composite nonwoven fabric obtained by hydroentangling the spunbond nonwoven fabric and the pulp fiber web as described above has the following improvements.

When the composite nonwoven fabric is produced by the spunbond nonwoven fabric and the pulp fiber web, the spunbond nonwoven fabric is set so that the longitudinal direction of the spunbond nonwoven fabric is parallel to the transport direction (TD) of the production apparatus, and tension is applied to the spunbond nonwoven fabric. is conveyed, and a pulp fiber web is supplied from above and entangled.
In such a manufacturing process, the spunbond nonwoven fabric tends to shrink in the lateral direction (perpendicular to the transport direction), and is sometimes transported while shifting in the left-right direction and meandering. That is, the conventional spunbonded nonwoven fabric has a problem of poor processing suitability when producing a composite nonwoven fabric. If the spunbonded nonwoven fabric meanders, a nonstandard composite nonwoven fabric is produced that includes defective portions in which the spunbonded nonwoven fabric does not exist and only the pulp fiber web exists.

It is generally known that the spunbond nonwoven fabric, which is subjected to tension in the transport direction as described above, can suppress dimensional change in the transverse direction by increasing the strength in the longitudinal direction. That is, if the strength in the machine direction is increased, the processability of the spunbond nonwoven fabric can be improved. For that purpose, as shown in FIG. A spunbonded nonwoven fabric SW in which the number of fusion bonding points MP is increased in the longitudinal direction LD is easily devised.

However, since it is difficult for the pulp fibers to get entangled in the fusion points, and the entanglement is insufficient, it looks like small holes. The composite nonwoven fabric is inferior in surface feeling (appearance).
In addition, although the longitudinal strength can be increased by increasing the fiber diameter of the spunbond nonwoven fabric, the texture of the spunbond surface of the composite nonwoven fabric after hydroentangling the pulp fiber web may be stiff. Sometimes it was worse.

Furthermore, as another technique for improving the strength in the machine direction, there is also a technique in which the fiber orientation is adjusted in advance so that the fibers of the spunbond nonwoven fabric are mostly oriented in the conveying direction of the composite nonwoven fabric manufacturing apparatus. However, when the degree of orientation of the fibers is increased so that the fibers are oriented in the conveying direction, the lateral strength of the manufactured composite nonwoven fabric decreases relative to the longitudinal strength, and when the composite nonwoven fabric is used for wipers, There was a case where the feeling of use was inferior because it was easy to tear.
As described above, conventionally, it is not easy to design a spunbonded nonwoven fabric with excellent processing suitability. It was difficult to provide a product that satisfies all of the goodness of tearing in the lateral direction and the resistance to tearing in the lateral direction.

Accordingly, an object of the present invention is to provide a composite nonwoven fabric that is excellent in processability during production and that can be evaluated in terms of all aspects of appearance, good touch and tear resistance in the lateral direction.

The above object is a composite nonwoven fabric in which a pulp fiber web is laminated and integrated on a spunbond nonwoven fabric, wherein the fiber diameter of the spunbond nonwoven fabric is 0.6 to 5.6 dtex, and the spunbond nonwoven fabric has a fiber diameter of 0.6 to 5.6 dtex The degree of molecular orientation in the longitudinal direction of the bonded nonwoven fabric is 1.1 to 1.9, and the weight composition ratio of the spunbond nonwoven fabric and the pulp fiber web is 40/60 to 10/90 (wt%). The spunbond nonwoven fabric has a basis weight of 7 to 20 g/m ² , the pulp fiber web has a basis weight of 30 to 70 g/m ² , and the spunbond nonwoven fabric has a width of 25 mm. When the test piece was subjected to a tensile test with a Tensilon, the force required to elongate it by 2 mm in the longitudinal direction was set to 1.5 to 5.0 N/25 mm, and the pulp fiber web was subjected to an air-laid device. It is formed by disentangling and piling up, stabilizing the placement state of the preliminary laminate in which the spunbond nonwoven fabric and the pulp fiber web are laminated, and from above the preliminary laminate It can be achieved by a composite nonwoven fabric characterized by spraying water mist and sucking the preliminary laminate from the lower side, followed by spraying a water jet to the preliminary laminate for hydroentangling treatment. Further, by setting the strength of the spunbonded nonwoven fabric within the above range, the processability of the spunbonded nonwoven fabric and the pulp fiber web is improved when the hydroentanglement treatment is performed. In addition, the composite nonwoven fabric obtained by laminating and integrating the pulp fiber web onto the spunbond nonwoven fabric can be more reliably resistant to tearing in the lateral direction during use and endowed with durability.

The material of the spunbond nonwoven fabric can be selected from the group consisting of nylon, vinylon, polyester, acryl, polyethylene, polypropylene, and polystyrene, or a combination of two or more, including polypropylene. preferable.
By using the spunbond nonwoven fabric as the above material, when the fiber diameter, the degree of molecular orientation, and the basis weight of the spunbond nonwoven fabric are set within the above ranges, the spunbond nonwoven fabric has an appropriate strength, and the spunbond nonwoven fabric and the pulp fiber web can be separated by water flow. The workability is improved when performing the entangling treatment.

In addition, the spunbond nonwoven fabric is formed to include a plurality of fusion points that connect spun resin fibers, and the area of one fusion point is preferably 0.10 to 0.50 mm ² . preferable.
Further, it is preferable that the area ratio per unit area of the fusion points is 7 to 20%, and the number of the fusion points is 10 to 150/cm ² .
By setting the fusion point of the spunbond nonwoven fabric within the above range, the strength of the spunbond nonwoven fabric can be designed in an appropriate range, and the composite is integrated by laminating the pulp fiber web on the spunbond nonwoven fabric. In the type nonwoven fabric, the surface texture of the composite type nonwoven fabric can be improved.

The above object is a method for producing a composite nonwoven fabric according to any one of the above, comprising the steps of defibrating and stacking the pulp fibers in the airlaid device to form the pulp fiber web, and the spunbond nonwoven fabric. and a hydroentanglement step of hydroentangling the pulp fiber web, wherein the hole diameter φ of the water jet nozzle for injecting the waterjet in the hydroentanglement step is 0.06 to 0.15 mm, and It can also be achieved by a method for producing a composite nonwoven fabric, characterized in that the distance between the water jet nozzles is 0.4 to 1.0 mm.

According to the present invention, it is possible to provide a composite nonwoven fabric that is excellent in processability during production and can be evaluated in terms of all aspects of appearance, good touch, and resistance to tearing in the lateral direction.

FIG. 2 is a diagram showing an example of the arrangement of fusion points in a spunbond nonwoven fabric, where (a) is the case where the fusion points are aligned in the vertical and horizontal directions, and (a) is the case where many fusion points are arranged in the vertical direction. It is a diagram showing about. It is the figure which showed about the manufacturing apparatus of the composite type nonwoven fabric which concerns on this invention.

A composite nonwoven fabric according to one embodiment of the present invention will be described below. The composite nonwoven fabric according to the present invention is a nonwoven fabric obtained by laminating a pulp fiber web on a spunbond nonwoven fabric and integrating them. A spunbonded nonwoven fabric is arranged in a predetermined configuration, and this spunbonded nonwoven fabric and a pulp fiber web are integrated in a predetermined composition ratio and basis weight.

The present inventors conducted intensive studies on the spunbond nonwoven fabric described above, and found that the fiber diameter and the degree of molecular orientation (fiber arrangement) are in a predetermined relationship without increasing the number of fusion points (without increasing the area ratio). A spunbonded nonwoven fabric having excellent processing suitability can be obtained by setting the above. The present inventors have found that a composite nonwoven fabric can be produced that satisfies all requirements for tear resistance in the transverse direction.

More specifically, a spunbond nonwoven fabric having a fiber diameter of 0.6 to 5.6 decitex and a degree of molecular orientation of 1.1 to 1.9 is used. The degree of molecular orientation here indicates the degree of fiber arrangement with respect to the longitudinal direction of the spunbond nonwoven fabric (conveyance direction in the production of the spunbond nonwoven fabric). The value of the degree of molecular orientation (MOR (Molecular Orientation Ratio) value) is an index of the orientation of the fibers that make up the nonwoven fabric. A larger value indicates a stronger degree of fiber arrangement in the longitudinal direction.
A spunbonded nonwoven fabric with an increased degree of molecular orientation (fiber arrangement) in the machine direction can be produced by a method such as increasing the wire speed during production of the spunbonded nonwoven fabric or slowing down the spinning supply speed. .
The degree of molecular orientation can be measured using a degree of molecular orientation meter. As the molecular orientation meter, MOA-6004 manufactured by Oji Scientific Instruments, for example, can be used.
A spunbond nonwoven fabric that satisfies the numerical conditions described above is excellent in processability when producing a composite nonwoven fabric.

Then, the above-mentioned spunbond nonwoven fabric and pulp fiber web are mixed so that the weight composition ratio (spunbond nonwoven fabric/pulp fiber web) is 40/60 to 10/90 (wt%), and the basis weight of the spunbond nonwoven fabric is 7 to 20 g/ m ² and the basis weight of the pulp fiber web is set to 30 to 70 g/m ² , and integrated by hydroentangling treatment to form a laminate. It is possible to obtain a composite nonwoven fabric that satisfies the directional tear resistance.

For the material of the spunbond nonwoven fabric, one or a combination of two or more can be selected from the group consisting of nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, and polystyrene, and preferably includes polypropylene. .
By using the spunbond nonwoven fabric as the above material, when the fiber diameter, the degree of molecular orientation, and the basis weight of the spunbond nonwoven fabric are set within the above ranges, the spunbond nonwoven fabric has an appropriate strength, and the spunbond nonwoven fabric and the pulp fiber web can be separated by water flow. The workability is improved when performing the entangling treatment.

Further, as the spunbond nonwoven fabric, when a tensile test of a 25 mm wide test piece is performed with Tensilon, the force required to stretch 2 mm in the longitudinal direction is set to 1.5 to 5.0 N / 25 mm. preferably adopted. By setting the strength of the spunbonded nonwoven fabric within the above range, the processability of the spunbonded nonwoven fabric and the pulp fiber web is improved when hydroentangling. In addition, the composite nonwoven fabric obtained by laminating and integrating the pulp fiber web onto the spunbond nonwoven fabric can be more reliably resistant to tearing in the lateral direction during use and endowed with durability.

In addition, the spunbond nonwoven fabric is formed to include a plurality of fusion points that connect spun resin fibers, and the area of each fusion point is preferably 0.10 to 0.50 mm ² . . The shape of the fusion point is not particularly limited, but it is preferable to select and adopt it from circles, ellipses, polygons, and the like. The area ratio per unit area of the fusion points is preferably 7 to 20%, and the number thereof is preferably set to 10 to 150/cm ² .
By setting the fusion point of the spunbond nonwoven fabric within the above range, the strength of the spunbond nonwoven fabric can be designed in an appropriate range, and the composite is integrated by laminating the pulp fiber web on the spunbond nonwoven fabric. In the type nonwoven fabric, the surface texture of the composite type nonwoven fabric can be improved.

As described above, the spunbonded nonwoven fabric is arranged in a predetermined configuration, and the spunbonded nonwoven fabric and the pulp fiber web are integrated at a predetermined composition ratio and basis weight to form a composite nonwoven fabric. , it is possible to obtain a composite nonwoven fabric that satisfies all of the tear resistance requirements in the transverse direction.
In the composite nonwoven fabric according to the present invention, it is preferable to form the pulp fiber web using pulp having an average pulp fiber length of 1.0 to 5.0 mm. Specifically, the pulp fiber web is preferably formed using fibers of softwood bleached kraft pulp (NBKP) selected from the group consisting of radiata pine, slash pine, southern pine, lodgepole pine, spruce and Douglas fir. . The pulp fiber web may be made of any one pulp fiber, or may be a pulp fiber web formed by mixing two or more pulp fibers.

(Example)
Furthermore, using the spunbond nonwoven fabric (SW) according to the above conditions, the composite nonwoven fabrics of Examples 1 to 6 and Comparative Examples 1 to 5 manufactured at a predetermined weight composition ratio and basis weight with the pulp fiber web were used. In addition to evaluating the processability of the spunbond nonwoven fabric when producing the type nonwoven fabric, sensory evaluation was performed on the appearance, touch, and resistance to tearing in the horizontal direction (durability) when the produced composite type nonwoven fabric was used as a wiper.
1) Processability: The processability of the spunbond nonwoven fabric was evaluated when the spunbond nonwoven fabric and the pulp fiber web were hydroentangled on a composite nonwoven fabric manufacturing apparatus.
Manufactured without problems (Excellent ◎), Spunbond nonwoven fabric shrinks slightly in the horizontal direction, but can be processed without problems (Good ○), Spunbond nonwoven fabric shrinks significantly in the horizontal direction, and processing aptitude is poor (Poor ×) ).
2) Appearance: Evaluation was made based on the presence or absence of small holes (parts where the spunbond nonwoven fabric is exposed) on the surface of the composite nonwoven fabric.
Appearance was particularly excellent (excellent ⊚), appearance without problems (good ∘), and poor appearance with conspicuous small holes (improper x).
3) Touch: Feeling on the surface (spunbonded surface) of the composite nonwoven fabric Smooth touch (excellent ◎), inferior to ◎, but usable without problems (good ○), spunbond fibers are stiff and feel to the touch. It was set as bad (impossible x).
4) Tear resistance in the horizontal direction: The resistance to tearing of the composite nonwoven fabric in the horizontal direction (durability) when the composite nonwoven fabric using the spunbond nonwoven fabric under the above conditions is wiped with a wiper.
Not torn at all (excellent ⊚), hardly torn and usable without problems (good ∘), easily torn and difficult to use (improper x).

As shown in Tables 1 and 2 below for Examples 1 to 6 and Comparative Examples 1 to 5, the spunbond nonwoven fabric had a fiber diameter (decitex), degree of molecular orientation, basis weight (g/m ² ), fusion The area of one point (mm ² ), the area ratio (%), the number of fusion points (pieces/cm ² ), the shape of the fusion points, and the longitudinal strength (N/25 mm) are set. The basis weight (g/m ² ) of the pulp fiber web and the weight composition ratio (Wt%) of the spunbond nonwoven fabric (SW) and the pulp fiber web are also set. Then, the pulp fiber web produced by the air-laid device was placed on the spunbond nonwoven fabric to produce a composite nonwoven fabric, which was used as a wiper and evaluated. As a testing machine for measuring the strength of the spunbond nonwoven fabric, a Tensilon universal testing machine (product name/type name: RTF-1250) manufactured by A&D Co., Ltd. was used. The test method was performed according to JIS P8113, the distance between the grips of the tensile tester was set to 100 mm, for example, and the measurement was performed at a tensile speed of 300 mm/min.

As shown in Table 1 above, Examples 1 to 6 can be provided as products. It was not acceptable in any of the sensory evaluations of resistance to tearing in the direction (durability).
According to Examples 1 to 6 above, the fiber diameter of the spunbond nonwoven fabric is 0.6 to 5.6 decitex, and the degree of molecular orientation of the spunbond nonwoven fabric is in the range of 1.1 to 1.9, The weight composition ratio of the spunbond nonwoven fabric and the pulp fiber web is 40/60 to 10/90 (wt%), the basis weight of the spunbond nonwoven fabric is 7 to 20 g/m ² , and the pulp fiber web basis weight is in the range of 30 to 70 g/m ² .

Hereinafter, a suitable manufacturing apparatus for manufacturing the above-described composite nonwoven fabric according to the present invention will be described with reference to the drawings.
First, the schematic configuration of the composite nonwoven fabric manufacturing apparatus 1 will be described. The manufacturing apparatus 1 shown in FIG. 2 includes an airlaid device 2, a spunbond nonwoven fabric supply device 3 for supplying spunbond nonwoven fabric, and a suction device 4 on the upstream side. The suction device 4 is arranged to face the lower side of the air raid device 2 .
Downstream from these devices 2, 3, and 4 in the web transport direction TD are, in order from the upstream side, a hydroentangling device 5 that injects water jets for hydroentangling treatment, a suction device 6, and a drying device 7. are placed. Downstream of the drying device 7, a winding device 8 is further provided for winding the continuously manufactured composite nonwoven fabric WP.

The air-laid device 2 includes a defibrator 21 that defibrates the sheet-like raw material pulp RP in which the fibers are densely packed into pulp fibers, and an air blower (not shown) that feeds the defibrated pulp fibers PF to an air-laid hopper 23 . and a duct 22 for conveying.

An air raid hopper 23 is arranged downstream of the duct 22 . The air-laid hopper 23 is designed so that the disentangled pulp fibers descend while being dispersed, and are gradually piled up at a stacking position 24 set on the lower surface to form a pulp fiber web PFW.
A suction device 4 is arranged below the stacking position 24 so as to face it. More specifically, the suction device 4 has a suction portion 42 on the upper surface of the device main body 41, and the suction portion 42 moves toward the stacking position 24 so as to apply a suction force (negative pressure) to the pulp fiber web PFW. have been set.
Note that FIG. 2 illustrates a case where the pulp fiber web PFW is formed by arranging the air laid hopper 23 and the suction device main body 41 one by one in one stage. However, the arrangement is not limited to this, and the air laid hopper 23 and the suction device main body 41 may be arranged in two or more stages according to the basis weight (basis weight) and production speed of the pulp fiber web PFW.

A carrier wire 43 for carrying the web is arranged around the suction device 4 . The conveying wire 43 is arranged such that the pulp fiber web PFW on which the pulp fibers PF are piled up at the stacking position 24 can be placed thereon and is conveyed downstream. However, the pulp fiber web PFW is not placed directly on the conveying wire 43 . This will become clear in the description below.
The conveying wire 43 is formed in an open mesh form (mesh) so that the suction force of the suction portion 42 extends to the opposite side (upper side).

Below the airlaid device 2 and upstream of the suction device 4, a spunbond nonwoven fabric supply device 3 is arranged. A spunbond nonwoven fabric SW prepared in advance is set in the form of a roll in the spunbond nonwoven fabric supply device 3 . That is, as described above, the designed spunbonded nonwoven fabric SW is taken up during manufacture into a roll, which is pulled out from the spunbonded nonwoven fabric supply device 3, mounted on the above-described carrier wire 43, and transported as described above. It is adapted to be transported to a stacking position 24 .
Further, it is preferable to adjust the weight ratio of spunbond nonwoven fabric/pulp fiber web to 40/60 to 10/90 (wt %).

The aforementioned pulp fiber web PFW is placed on the spunbond nonwoven fabric SW positioned at the stacking position 24 . At the stacking position 24, the suction force of the suction portion 42 of the suction device 4 passes through the conveying wire 43 and acts on the spunbond nonwoven fabric SW and the pulp fiber web PFW thereon. Therefore, a preliminary laminate PWeb (laminated web) in which the spunbond nonwoven fabric SW and the pulp fiber web PFW are laminated is conveyed downstream.
By controlling the supply amount of the pulp fiber web PFW onto the spunbond nonwoven fabric SW when the preliminary laminate PWeb is formed as described above, the pulp fibers contained in the composite nonwoven fabric manufactured by this apparatus are controlled. The basis weight of the web PFW is designed to be 30-70 g/m ² . The basis weight of the pulp fiber web PFW is determined by appropriately adjusting the web transport speed, the supply amount of the pulp fiber web PFW per hour, etc., and checking the basis weight of the manufactured composite nonwoven fabric pulp fiber web PFW. , the basis weight may be set within a desired range.

The above-described preliminary laminate PWeb is suction-compressed by the suction force of the suction device 4, so that the laminated state is maintained. At this time, the fibers of the upper pulp fiber web PFW are in a densified state. However, if the preliminary laminate PWeb is transported into the hydroentangling device 5 on the downstream side as it is, there is a risk that some of the pulp fibers PF will be blown up by water jets (high-pressure water streams).
Therefore, in the present manufacturing apparatus 1, nipping rollers 28 for sandwiching the preliminary laminate PWeb from above and below to stabilize the state of placement of the pulp fiber web PFW on the spunbond nonwoven fabric SW, and upstream of the hydroentangling device 5 A pre-wetting device 30 is provided on the side to apply water to prevent scattering of fibers. The pre-wetting device 30 preferably applies a suction force from a spray nozzle 31 that sprays water mist from above the preliminary laminated body PWeb and from the lower side of the preliminary laminated body PWeb (that is, the lower surface of the pulp fiber web PFW). and a suction device 32 .

Although FIG. 2 illustrates the case where the prewetting device 30 is provided as a new device in front of the hydroentangling device 5 as described above, the present invention is not limited to this. Among a plurality of sets each including a water jet head 51 and a suction device 52 (to be described later) included in the hydroentangling device 5, the design may be changed such that the head set is used as the prewetting device 30 described above. In this case, adjustment may be made so that low-pressure water mist is sprayed from the leading water jet head 51 .
In the case of the hydroentangling device 5 in which the number of sets of the water jet head 51 and the suction device 52 sufficient to perform the hydroentanglement treatment is ensured, the top water jet head 51 and the suction device 52 are preliminarily set as described above. Utilizing it as a wet device is effective in suppressing the equipment cost.

Then, in the hydroentangling device 5, a high-pressure water jet is blown onto the preliminarily laminated body PWeb treated by the nipping roller 28 and the prewetting device 30, which serves as a pretreatment section, thereby promoting entangling of the pulp fibers. This promotes integration of the upper pulp fiber web PFW layer and the lower spunbond nonwoven fabric SW layer (hydroentanglement treatment).
The hydroentangling device 5 exemplarily shown in FIG. 2 has water jet heads 51 arranged in multiple stages (four stages are illustrated in FIG. 2) along the transport direction TD.
Although FIG. 2 does not show the nozzles provided in the water jet head 51 extending in the direction perpendicular to the conveying direction TD (the width direction of the web), a plurality of water jets are arranged in the width direction. A jet nozzle is placed at an appropriate position. The hole diameter φ of this water jet nozzle is preferably 0.06 to 0.15 mm. Also, the interval between the water jet nozzles is preferably 0.4 to 1.0 mm.

It is preferable to set the water pressure during the hydroentangling process in consideration of the basis weights of the pulp fiber web PFW and the spunbond nonwoven fabric SW. For example, it is preferable to select in the range of 1 to 30 MPa.

A suction device 52 is arranged so as to face the water jet head 51 . While blowing a high-pressure water jet from a water jet head 51 onto the pulp fiber web PFW positioned above, the suction force of a suction device 52 is applied to the lower side of the spunbond nonwoven fabric SW positioned below. Due to the cooperative action of the water jet head 51 and the suction device 52, the pulp fibers on the pulp fiber web PFW side enter the lower spunbond nonwoven fabric SW, or penetrate the spunbond nonwoven fabric SW to reach the opposite side. It is presumed that such a state is formed. Its action promotes the integration of the two layers.

A carrier wire 55 is also arranged in the hydroentangling device 5 . A transport wire 55 receives the preliminary laminate PWeb downstream of the pretreatment stations 28 , 30 and transports it into the hydroentangling device 5 . The carrier wire 55 is arranged to pass between the water jet head 51 of the hydroentangling device 5 and the suction device 52 from the upstream side to the downstream side.
Therefore, the preliminary laminate PWeb conveyed on the conveying wire 55 is subjected to more hydroentangling treatment as it goes downstream in the conveying direction TD, and when it leaves the hydroentangling device 5, the upper pulp fibers Sufficient entangling of the web PFW layer and the lower spunbond nonwoven fabric SW layer is realized.
The nonwoven fabric immediately after leaving the hydroentangling device 5 is in a wet state, and the bonds between the pulp fibers are not sufficiently established.

Therefore, as shown in FIG. 2, on the downstream side of the hydroentangling device 5, a suction device 6 and a suction device 6 for removing residual moisture from the web by suction and then drying to complete the production of the composite nonwoven fabric WP are provided. A drying device 7 is provided. By dehydrating and drying by the suction device 6 and the drying device 7 in the latter stage of the production of the composite nonwoven fabric WP, the composite nonwoven fabric can be efficiently produced, and the produced hydroentangled composite nonwoven fabric has a large Since a dry composite nonwoven fabric can be produced without applying an external pressure, a bulky product can be produced.
The suction device 6 dewaters the hydroentangled nonwoven fabric by, for example, a vacuum system. The drying device 7 preferably employs a non-compression type dryer, preferably an air-through dryer. In FIG. 2, a rotatable dryer body 71 of the air-through dryer is a cylindrical body, and has a large number of through holes on its peripheral surface. It is preferable to adopt a configuration in which the air is sucked in toward the side.
The composite nonwoven fabric WP continuously produced in this way is taken up by the roll 81 of the take-up device 8 to complete a series of steps.

According to the composite nonwoven fabric manufacturing apparatus 1 described above, the composite nonwoven fabric according to the present invention, which is excellent in processability during manufacturing, has excellent appearance, good touch, and is resistant to tearing in the lateral direction, can be produced. It can be manufactured efficiently.
In the manufacturing apparatus shown in FIG. 2, the pulp fiber web is obtained by defibrating and gradually laminating the pulp fibers using the air-laid device 2 . The pulp fiber web can be manufactured by applying the manufacturing method of the wet papermaking sheet, but if the pulp fiber web is manufactured by the dry process using the airlaid device 2 as described above, the manufacturing equipment can be simplified and the present invention can be more efficiently produced. A composite nonwoven fabric according to the invention can be produced.

Although the description of the embodiments is finished above, the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

1 Composite type nonwoven fabric manufacturing device 2 Airlaid device 3 Spunbond nonwoven fabric supply device 4 Suction device 5 Hydroentangling device 6 Suction device 7 Drying device 8 Winding device 21 Defibering machine 22 Duct 23 Airlaid hopper 24 Stacking position 28 Clamping roller 30 Prewet Apparatus 31 Spray nozzle 32 Suction device 41 Suction device body 42 Suction part 43 Transfer wire 51 Water jet head 52 Suction device 55 Transfer wire SW Spunbond nonwoven fabric MP Fusion point PF Pulp fiber PFW Pulp fiber web PWeb Preliminary laminate (laminated web )
WP Composite type nonwoven fabric TD Conveying direction LD Vertical direction CD Horizontal direction

Claims (5)

A composite nonwoven fabric in which a pulp fiber web is laminated and integrated on a spunbond nonwoven fabric,
The spunbond nonwoven fabric has a fiber diameter of 0.6 to 5.6 decitex and a degree of molecular orientation in the longitudinal direction of the spunbond nonwoven fabric of 1.1 to 1.9,
Further, the weight composition ratio of the spunbond nonwoven fabric and the pulp fiber web is 40/60 to 10/90 (wt%), the basis weight of the spunbond nonwoven fabric is 7 to 20 g/ ^m2 , and The pulp fiber web has a basis weight of 30 to 70 g/m ² ,
The spunbond nonwoven fabric has a force of 1.5 to 5.0 N/25 mm required to stretch 2 mm in the longitudinal direction when a tensile test is performed on a test piece formed with a width of 25 mm using a Tensilon.
The pulp fiber web is formed by fibrillating and piling up pulp fibers with an air-laid device,
Stabilizing the placement state of a preliminary laminate in which the spunbond nonwoven fabric and the pulp fiber web are laminated, spraying water mist from above the preliminary laminate and placing the preliminary laminate below it A composite nonwoven fabric characterized in that it is obtained by subjecting the preliminary laminate to a hydroentangling treatment by blowing a water jet onto the preliminary laminate after sucking it from the air . 2. The material according to claim 1, wherein the material of said spunbond nonwoven fabric is selected from the group consisting of nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, and polystyrene, or a combination of two or more. Composite nonwoven fabric. The spunbond nonwoven fabric is formed to include a plurality of fusion points that connect spun resin fibers, and the area of each fusion point is 0.10 to 0.50 mm ² . The composite type nonwoven fabric according to claim 1 or 2 . The composite mold according to claim 3 , characterized in that the area ratio per unit area of said fusion points is 7-20%, and the number of said fusion points is 10-150/cm ² . non-woven fabric. A method for producing the composite nonwoven fabric according to any one of claims 1 to 4 ,
forming the pulp fiber web by fibrillating and stacking the pulp fibers in the air-laid device;
a hydroentangling step of hydroentangling the spunbond nonwoven fabric and the pulp fiber web ;
including at least
The hole diameter φ of the water jet nozzle for injecting the water jet in the hydroentanglement step is 0.06 to 0.15 mm, and the interval between the water jet nozzles is 0.4 to 1.0 mm. A method for producing a composite nonwoven fabric.

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