JP7307632B2 - Manufacturing method of composite nonwoven fabric - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing 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 spunbonded nonwoven fabric has both liquid absorbency based on pulp fibers and strength based on a spunbonded nonwoven fabric. 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 hydroentangling 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.
Paragraph 0040 of Patent Document 1 discloses that uniform appearance and tactile properties can be imparted by lightly compressing the composite nonwoven fabric with calender rolls in the finishing or post-treatment process of the manufactured composite nonwoven fabric.

Japanese Patent No. 2533260

When a composite nonwoven fabric is produced by hydroentangling a spunbond nonwoven fabric and a pulp fiber web, the liquid absorbency of the composite nonwoven fabric (water absorbency in the case of water, hereinafter referred to as water absorbency) depends on that of the pulp fiber web. It is known that there is a correlation with basis weight. Therefore, when a pulp fiber web is laminated on a spunbond nonwoven fabric having a constant basis weight and hydroentangled to produce a composite nonwoven fabric, increasing the amount of the pulp fiber web increases the water absorbency of the composite nonwoven fabric. can be improved.
However, if the ratio of the pulp fiber web is increased too much, a composite nonwoven fabric containing a large amount of pulp fibers that do not get entangled in the spunbond nonwoven fabric is produced in the compositing treatment in the manufacturing process. Such a composite nonwoven fabric has an increased thickness, and when it is used as a wiper, for example, the fluff on the surface becomes conspicuous, and the fallen fibers tend to remain where the dirt has been wiped off, resulting in poor usability. In addition, the wet Taber value, which is an index of abrasion resistance, is inferior to the standard composite nonwoven fabric.
Conventionally, a composite nonwoven fabric manufactured by hydroentangling a spunbond nonwoven fabric and a pulp fiber web has excellent water absorption performance, less fluffing and falling fibers, and excellent usability. It has been considered difficult to realize a composite nonwoven fabric that is excellent in terms of all aspects, such as user satisfaction in terms of abrasion resistance.
Paragraph 0040 of Patent Document 1 merely discloses that the composite nonwoven fabric to be produced is lightly compressed with a calender roll in finishing in order to impart uniform appearance and tactile properties.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for producing an improved composite nonwoven fabric which is excellent in water absorption performance and satisfactorily in terms of feeling in use and abrasion resistance.

The above object is a method for manufacturing a composite nonwoven fabric in which a pulp fiber web is laminated and integrated on a spunbond nonwoven fabric, and has a basis weight of 52.0 to 81.0 g/m ² and a thickness of 0.0 g/m 2 . 28 to 0.43 mm, a drip water absorbency of 0.5 to 3.0 seconds, a water retention capacity of 240 to 400 g/m ² , and a wet Taber value of at least 5 times. When manufacturing the composite nonwoven fabric, as a post-process after laminating and integrating the spunbond nonwoven fabric and the pulp fiber web, calendering is performed with a plain calender roll, and in the calendering, the plain calendering The roll temperature is 40 to 100° C., the gap between rolls is 0 to 0.3 mm, and the linear pressure applied to the composite nonwoven fabric when passing between the plain calender rolls is 1 to 30 kg/cm. It can be achieved by a method for producing a composite nonwoven fabric.

It is desirable to produce the composite nonwoven fabric having a specific volume of 4.0 to 6.5 cm ³ /g.
Further, the basis weight of the pulp fiber web is 40.0 to 70.0 g/m ² , and the weight composition ratio of the spunbond nonwoven fabric and the pulp fiber web is 40/60 to 10/90 (wt%). It is preferred to produce one of the composite nonwoven fabrics .

The composite nonwoven fabric , wherein the pulp fiber web is made of bleached softwood kraft pulp fibers selected from the group consisting of radiata pine, slash pine, southern pine, lodgepole pine, spruce and Douglas fir. can be done.

Further, the spunbond nonwoven fabric has a basis weight of 7.0 to 20.0 g/m ² and is formed to include a plurality of fusion points connecting spun resin fibers. is 0.10 to 0.50 mm ² , the area ratio of the fusion points per unit area is 7 to 20%, and the number of the fusion points is 10 to 150/cm ² . .
And the composite nonwoven fabric , wherein the material of the spunbond nonwoven fabric is one or a combination of two or more selected from the group consisting of nylon, vinylon, polyester, acrylic, polyethylene, polypropylene and polystyrene. can be manufactured .

According to the present invention, it is possible to produce a composite nonwoven fabric that is excellent in water absorption performance and that is improved in a well-balanced manner that satisfies usability and abrasion resistance.

It is the figure which showed the apparatus which manufactures 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 in which a pulp fiber web is laminated on a spunbond nonwoven fabric and integrated, and in particular, the ratio of the pulp fiber web is relatively increased to improve water absorption performance. It is a thing.

The present inventor conducted extensive research on the spunbonded nonwoven fabric described above, and found that even if the ratio of the pulp fiber web is relatively increased with respect to the spunbonded nonwoven fabric, the conventional composite nonwoven fabric can be improved by applying an appropriate calendering treatment. The present inventors have found that it is possible to produce a composite nonwoven fabric that is more satisfactory in terms of feeling of use and abrasion resistance while improving water absorption.

More specifically, it is a composite nonwoven fabric obtained by laminating and integrating a pulp fiber web on a spunbond nonwoven fabric, having a basis weight of 52.0 to 81.0 g/m ² and a thickness of 0.28 to 0. 0.43 mm, a drip absorption of 0.5 to 3.0 seconds, a water retention capacity of 240 to 400 g/m ² , and a wet Taber value of at least 5 times.
Here, the above thickness is obtained by a Peacock thickness gauge under a load of 37.85 g/cm ² . In addition, the above-mentioned drip water absorption is based on the water absorption rate test specified in JIS S3104, the amount of dripping water is 0.1 mL, and the time from when the water droplet reaches the surface of the test piece to when the specular reflection of the test piece disappears. Time (seconds) is obtained. In addition, the water retention amount (T.W.A.: Total Water Absorbency) was measured by cutting the composite nonwoven fabric sheet into a square of 76 mm × 76 mm to prepare a sample, measuring the dry weight, and then immersing this sample in distilled water. After soaking for 2 minutes, the sample is stretched in a water vapor saturated (100% RH) container with one corner on top and supporting the top and two adjacent corners. It was hung in a state where it was soaked, left for 30 minutes, and the weight after draining was determined. Then, the measured value is converted into a water retention amount (g/m ² ) per 1 m ² of the sample.
Furthermore, the composite nonwoven fabric of the present invention preferably has a specific volume of 4.0 to 6.5 cm ³ /g.
When used as a wiper or the like, the composite nonwoven fabric that satisfies the above constitution has excellent water absorbency and is satisfactory in terms of feel and abrasion resistance.
More preferably, the aforementioned basis weight is 58.0 to 75.0 g/m ² , thickness is 0.30 to 0.40 mm, drip water absorption is 0.5 to 2.5 seconds, and water retention is 300 to 400 g. /m ² and a wet Taber value of at least 7 times. A composite nonwoven fabric that satisfies this constitution is particularly excellent in water absorbency when used as a wiper or the like, and is satisfactory in terms of feeling of use and abrasion resistance with less fiber shedding and fluffing.

If the ratio of the pulp fiber web is increased in the composite nonwoven fabric, it can be expected to improve the water absorbency. It is inferior, and abrasion resistance will also fall. On the other hand, by performing appropriate calendering in the manufacturing process, it is possible to obtain a composite nonwoven fabric with reduced thickness and improved other disadvantages.
By the way, if the thickness of the composite nonwoven fabric adjusted by calendering is too thick, the problem pointed out above cannot be sufficiently solved. On the other hand, even if it is too thin (even if it is crushed too much by increasing the linear pressure (holding pressure) due to calendering), the performance as a wiper or the like is inferior. This is because the composite type nonwoven fabric is too thin, the wiping feeling is poor, and the fabric is easily torn. Thus, the thickness of the composite nonwoven fabric must be within an appropriate range.
The composite nonwoven fabric of the present invention has been made based on the above technical background, and is satisfactory in terms of feeling of use and abrasion resistance by suppressing fiber separation while improving water absorption performance. It has become.
The water absorbency of the composite nonwoven fabric is highly correlated with the basis weight of the pulp web, and even if the density of the pulp web is increased by, for example, calendering, the water absorbency does not deteriorate.

In the composite nonwoven fabric, the basis weight of the pulp fiber web is 40.0 to 70.0 g/m ² , and the weight composition ratio of the spunbond nonwoven fabric to the pulp fiber web is 40/60 to 10/90. (wt%) is preferable.
The composite nonwoven fabric satisfying the above constitution has excellent water absorbency when used as a wiper or the like.
More preferably, the basis weight of the pulp fiber web is 50.0 to 70.0 g/m ² , and the weight composition ratio of the spunbond nonwoven fabric to the pulp fiber web is 30/70 to 15/85 (wt %). A composite nonwoven fabric satisfying this constitution is particularly excellent in water absorption when used as a wiper or the like.

The pulp fiber web is preferably formed using fibers of bleached softwood 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.
The composite nonwoven fabric satisfying the above-mentioned constitution is excellent in water absorbency and satisfactorily wearable when used as a wiper or the like.

The spunbond nonwoven fabric has a basis weight of 7.0 to 20.0 g/m ² and is formed to include a plurality of fusion points connecting spun resin fibers, and the area of one fusion point is 0.10 to 0.50 mm ² , the area ratio per unit area of the fusion points is 7 to 20%, and the number is preferably 10 to 150/cm 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.
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 feeling of use and abrasion resistance are also satisfactory.
The material of the spunbond nonwoven fabric is preferably one selected from the group consisting of nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, and polystyrene, or a combination of two or more selected. Polypropylene is particularly preferred.
By using the spunbond nonwoven fabric as the above material and setting the fusion point and basis weight of the spunbond nonwoven fabric within a predetermined range, the spunbond nonwoven fabric has an appropriate strength, and the pulp fiber web is laminated and integrated with the spunbond nonwoven fabric. In the composite type nonwoven fabric currently used, the feeling of use and abrasion resistance are also satisfactory.
More preferably, the spunbond nonwoven fabric has a basis weight of 10.0 to 16.0 g/m ² and is formed to include a plurality of fusion points connecting spun resin fibers, and the fusion points It is preferable that the area of one piece is 0.10 to 0.30 mm ² and the area ratio per unit area of the fusion point is 9 to 15%. By setting the fusion point and the basis weight of the spunbonded nonwoven fabric within a predetermined range, the composite nonwoven fabric in which the pulp fiber web is laminated and integrated with the spunbonded nonwoven fabric has a feeling of use with less fiber dropout and fluffing. and wear resistance are also satisfactory.

(Example)
Furthermore, Example 1 in which the spunbond nonwoven fabric (SW) and the pulp fiber web according to the above conditions were manufactured so as to have a predetermined range of basis weight, thickness, specific volume, drip water absorption, water retention amount, and wet Taber value. The composite nonwoven fabrics Nos. 1 to 5 and Comparative Examples 1 to 4 thereof were sensory evaluated for water absorbency, less fiber loss, and difficulty in opening holes (abrasion resistance) when the composite nonwoven fabric was used as a wiper. .
1) Absorption Both speed and amount of water absorption are particularly excellent (excellent ◎), there is no problem (good ○), and the speed and amount of water absorption are poor and the feeling of use is poor (poor) ×) was distinguished and the water absorbency was evaluated.
2) Shedding fibers Excellent with almost no shedding fibers (excellent ◎), some shedding fibers but at a level that can be used without problems (good ○), and many shedding fibers that are difficult to use (poor) x) were distinguished to evaluate fallen fibers.
3) Difficulty in opening holes (wear resistance)
Evaluate the difficulty of opening holes by distinguishing excellent ones that do not open at all (excellent ◎), ones that can be used without problems (good ○), and ones that easily open holes and are difficult to use (improper x). bottom. This evaluation was evaluated using the Wet Taber value. The wet Taber value was measured using a Taber tester specified in JIS L1096, and a pair of friction wheels (H-18) formed from a bonded abrasive by attaching a sample wetted with water to a rotating horizontal disc. was applied under a specified load (4.9 N) to examine wear resistance. Judgment was made by the number of rotations of the disk until the hole in the sheet became 13 mm due to wear.

Regarding Examples 1 to 5 and Comparative Examples 1 to 4, as shown in Tables 1 and 2 below, the basis weight (g/m ² ), thickness (mm), drip water absorbency (seconds) of the composite nonwoven fabric , water retention amount (g/m ² ) and wet taber value (times). A specific volume (cm ³ /g) is also set.
Furthermore, 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 shown in Table 1 above, Examples 1 to 5 can be provided as products. Wearability) was not acceptable in any of the sensory evaluations.
According to Examples 1 to 5 above, the composite nonwoven fabric has a basis weight of 52.0 to 81.0 g/m ² , a thickness of 0.28 to 0.43 mm, and a drip water absorbency of 0.5 to 3.0 seconds. , a water retention capacity of 240 to 400 g/m ² and a wet Taber value of at least 5 times. Also, the specific volume was within the range of 4.0 to 6.5 cm ³ /g.
The basis weight of the pulp fiber web is 40.0 to 70.0 g/m ² , and the weight composition ratio of the spunbond nonwoven fabric and the pulp fiber web is 40/60 to 10/90 (wt%). was within range.

Hereinafter, a manufacturing apparatus suitable for manufacturing the above-described composite nonwoven fabric according to the present invention will be further 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. 1 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, there is provided a winding device 8 for winding the continuously manufactured composite nonwoven fabric WP.
Further, the manufacturing apparatus 1 is provided with a calendering device CA between the drying device 7 and the winding device 8 for calendering the nonwoven fabric WP after the compositing treatment.

The air-laid device 2 includes a defibrator 21 that defibrates the raw material pulp RP in which the fibers are densely packed in a sheet form into pulp fibers, and an air blower (not shown) that feeds the defibrated pulp fibers PF to the 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. 1 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 set to, for example, 40.0 to 70.0 g/m ² , and is designed so that the ratio of the pulp fiber web is higher than that of conventional general composite nonwoven fabrics. The basis weight of the spunbond nonwoven fabric SW is, for example, 7.0 to 20.0 g/m ² , and the weight composition ratio of the spunbond nonwoven fabric and the pulp fiber web is 40/60 to 10/90 (wt%). . By appropriately adjusting the transport speed of the web, the supply amount of the pulp fiber web PFW per hour, and the like, and checking the basis weight of the pulp fiber web PFW of the manufactured composite nonwoven fabric, the basis weight is within the desired range. should be set as follows.

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. 1 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. 1 has water jet heads 51 arranged in multiple stages (four stages are illustrated in FIG. 1) along the transport direction TD.
Although FIG. 1 does not show the nozzles provided in the water jet head 51 extending in the direction perpendicular to the transport 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 achieved.
The composite 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. 1, on the downstream side of the hydroentangling device 5, there is a suction device 6 and a suction device 6 for removing residual moisture from the web by suction, drying the web, and completing the production of the composite nonwoven fabric WP. 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 dehydrates the hydroentangled composite 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. 1, 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 generally wound around the roll 81 of the winding device 8 after being dried. 8, a calendering device CA is arranged as a post-processing device.
A pair of plain calender rolls (not shown) are arranged in the calender device CA, and the composite nonwoven fabric WP is nipped and conveyed therebetween with a linear pressure (nipping pressure) within a predetermined range.
The plain calender roll that can be employed here is a roll having a flat outer peripheral surface, and if it is a roll that can apply a stable and uniform linear pressure to the nonwoven fabric WP after compositing treatment, that roll can be used. The material is not particularly limited. For example, a pair of calender rolls, one of which is a metal plain roll and the other is a metal-rubber plain roll having a metal core and a rubber material on the outside, can be suitably employed. For the metal roll and the metal core, for example, a steel roll can be used, and for the rubber material, for example, a special hard rubber can be used.

The calendering process in the calendering device CA is carried out, for example, with a roll temperature of 40 to 100° C., a roll gap of 0 to 0.3 mm, preferably 0.1 mm to 0.3 mm, and a line on the composite nonwoven fabric WP passing between the rolls. It is set so that a pressure of 1 to 30 kg/cm is applied. By performing calendering under such conditions, it is possible to obtain a composite nonwoven fabric that is satisfactory in terms of feel and abrasion resistance even when the content of the pulp fiber web is relatively high.
If necessary, pairs of plain calender rolls may be arranged in multiple stages in the calendering device CA so that the calendering process can be performed in multiple stages.

According to the manufacturing apparatus 1 for the composite nonwoven fabric described above, it is possible to efficiently manufacture the composite nonwoven fabric according to the present invention, which is excellent in water absorption performance and satisfactorily improved in use feeling and abrasion resistance. .
In the manufacturing apparatus shown in FIG. 1, 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 a sheet manufacturing method using a wet papermaking method, but manufacturing the pulp fiber web by the dry method using the airlaid device 2 as described above simplifies the manufacturing equipment and increases efficiency. The composite nonwoven fabric according to the present invention can be produced well.

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 scope 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 unit 43 Transfer wire 51 Water jet head 52 Suction device 55 Transfer wire SW Spunbond nonwoven fabric PF Pulp fiber PFW Pulp fiber web PWeb Preliminary laminate (laminated web)
WP Composite type nonwoven fabric TD Conveying direction CA Calender device

Claims (6)

A method for manufacturing a composite nonwoven fabric in which a pulp fiber web is laminated and integrated on a spunbond nonwoven fabric,
The basis weight is 52.0 to 81.0 g/m ² , the thickness is 0.28 to 0.43 mm, the drip water absorption is 0.5 to 3.0 seconds, and the water retention capacity is 240 to 400 g/m ² , and producing the composite nonwoven fabric having a wet Taber value of at least 5 times,
When manufacturing the composite nonwoven fabric, as a post-process after laminating and integrating the spunbond nonwoven fabric and the pulp fiber web, calendering is performed with a plain calender roll,
In the calendering process, the temperature of the plain calender roll is 40 to 100° C., the gap between rolls is 0 to 0.3 mm, and the linear pressure applied to the composite nonwoven fabric when passing between the plain calender rolls is 1 to 1. 30 kg /cm . 2. The method for producing a composite nonwoven fabric according to claim 1, wherein the composite nonwoven fabric has a specific volume of 4.0 to 6.5 cm ³ /g. The basis weight of the pulp fiber web is 40.0 to 70.0 g/m ² , and the weight composition ratio of the spunbond nonwoven fabric to the pulp fiber web is 40/60 to 10/90 (wt%) . 3. The method for producing a composite nonwoven fabric according to claim 1, wherein a composite nonwoven fabric is produced. manufacturing said composite nonwoven fabric , wherein said pulp fiber web is formed of softwood bleached kraft pulp fibers selected from the group consisting of radiata pine, slash pine, southern pine, lodgepole pine, spruce and Douglas fir; The method for producing a composite nonwoven fabric according to any one of claims 1 to 3. The spunbond nonwoven fabric has a basis weight of 7.0 to 20.0 g/m ² and is formed to include a plurality of fusion points connecting spun resin fibers, and the area of one fusion point is 0.10 to 0.50 mm ² , the area ratio per unit area of the fusion points is 7 to 20%, and the number is 10 to 150/cm ² . The method for producing a composite nonwoven fabric according to any one of claims 1 to 4. The material of the spunbond nonwoven fabric is one or a combination of two or more selected from the group consisting of nylon, vinylon, polyester, acrylic, polyethylene, polypropylene and polystyrene. The method for producing a composite nonwoven fabric according to any one of claims 1 to 5, characterized in that:

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