JP7431612B2 - Composite nonwoven fabric - 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 made of a pulp fiber web and a spunbond nonwoven fabric has both the liquid absorbency based on the pulp fiber and the strength based on the spunbond nonwoven fabric, so it can be used in industrial wipers such as rags, washcloths, and towels. It is widely used in various applications such as wipers for personal use.

For example, as disclosed in Patent Document 1, after a pulp fiber web and a spunbond nonwoven fabric are layered, they are integrated by a hydroentangling process in which a high-pressure water jet (water stream) is sprayed onto them. Since the spunbond nonwoven fabric has excellent strength, it functions as a backing layer for the manufactured composite nonwoven fabric. On the other hand, pulp fiber webs have excellent liquid absorption properties. Therefore, such a composite nonwoven fabric is an excellent composite type that combines the advantages of a pulp fiber web with good absorbency for both aqueous and oil-based liquids and a spunbond nonwoven fabric with excellent strength. It can be provided to consumers as a non-woven fabric.

It is preferable that the composite nonwoven fabric is designed so that the pulp fibers do not easily fall off when used. Composite nonwoven fabrics are used as wipers and the like in both dry and wet conditions. If the pulp fibers noticeably fall off during use, the commercial value will decrease.
In addition, it is conventionally known that when manufacturing a nonwoven fabric containing pulp fibers by reusing sheet manufacturing technology using a wet papermaking method, a paper strength agent is added to the pulp fibers in advance ( For example, Patent Documents 2 and 3). In the pulp fiber web manufactured in this way, the state of the constituent fibers is stabilized, so that it is possible to prevent the fibers from falling off.

Patent No. 2533260 Japanese Patent Application Publication No. 2012-211412 Special table 2018-535126 publication

Regarding the pulp fiber web used in a composite nonwoven fabric made of a pulp fiber web and a spunbond nonwoven fabric, it is easily conceived to use a pulp fiber web to which a paper strength agent has been added using the conventional wet papermaking method. However, compared to using the air-laid method, producing pulp fiber webs using the wet papermaking method requires larger production equipment, which increases production costs.Furthermore, foreign matter circulating in the white water is completely removed during the papermaking process. Therefore, there is a problem in that foreign matter is likely to be mixed into the manufactured composite nonwoven fabric.
In addition, when producing a pulp fiber web containing paper strength agents using the wet papermaking method, a large amount of the paper strength agents cannot be fixed on the pulp and flows out into the white water, resulting in poor paper strength agent yields (increasing costs). Points are also a problem.
Therefore, it is strongly desired to produce a composite nonwoven fabric using a pulp fiber web obtained by the air-laid method, but there is a problem that the pulp fibers tend to fall off during processing and use, and there are no effective methods to deal with this problem. This technology has not yet been established.

Therefore, an object of the present invention is to provide a composite nonwoven fabric in which pulp fibers are prevented from falling off even when an air-laid method is adopted.

The above object is to provide a composite nonwoven fabric in which a pulp fiber web obtained by an air-laid method is laminated and integrated on a spunbond nonwoven fabric, wherein the pulp fiber web contains a paper strength agent and an amphoteric resin; The amount of the paper strength agent added in terms of solid content is 0.04 to 1.0% with respect to the solid weight of the pulp fiber web, and the amount added in terms of solid content of the amphoteric resin is 0.06 to 1.0%. This can be achieved by a composite non-woven fabric characterized by having a concentration of 1.5%.

It is preferable that the mixing ratio of the paper strength agent and the amphoteric resin is 10/90 to 70/30.

Further, it is preferable that the paper strength agent is at least one selected from the group consisting of polyamide epichlorohydrin type, polyamide epoxy type, and polyamide polyamine type.
Preferably, the amphoteric resin is at least one selected from the group consisting of polyacrylamide, starch, and guar gum.
Further, it is preferable that the basis weight of the composite nonwoven fabric is 40.0 to 165.0 g/m ² .

According to the present invention, it is possible to provide a composite nonwoven fabric in which pulp fibers are prevented from falling off even if an air-laid method is adopted.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure shown about the suitable apparatus for manufacturing the composite type nonwoven fabric based on this invention.

The composite nonwoven fabric according to the present invention will be explained below.
The present inventors have conducted intensive studies to prevent fibers from falling off from the pulp fiber web for composite nonwoven fabrics manufactured by supplying pulp fiber webs using an air-laid method that can reduce equipment costs. The present invention was developed after confirming that containing a paper strength agent and an amphoteric resin can dramatically suppress fiber shedding. In one embodiment, such a composite nonwoven fabric is produced by laminating a pulp fiber web on a spunbond nonwoven fabric and integrating it by hydroentangling treatment, and then adding a paper strength agent and an amphoteric resin to the pulp fiber web. be able to.
As the paper strength agent, those known as wet paper strength agents in the paper manufacturing process are preferably used, and specifically, those selected from the group consisting of polyamide epichlorohydrin type, polyamide epoxy type, and polyamide polyamine type. Preferably, at least one is used.
Further, examples of the amphoteric resin include polyacrylamide-based resins, starch-based resins (for example, tapioca starch), guar gum, etc., but it is preferable to use polyacrylamide-based resins.

Since the composite nonwoven fabric according to the present invention contains a paper strength agent and an amphoteric resin on the pulp fiber web side, the crosslinks formed between the anionic pulp fibers and the cationic paper strength agent are It is presumed that the amphoteric resin having both properties assists in crosslinking, so that the paper strength agent functions (acts) effectively and can effectively prevent pulp fibers from falling off.

Hereinafter, a manufacturing apparatus suitable for manufacturing the composite nonwoven fabric according to the present invention will be described with reference to FIG. 1.
A schematic configuration of a composite nonwoven fabric manufacturing apparatus 1 will be described. A manufacturing apparatus 1 shown in FIG. 1 includes an air-laid device 2 for supplying a pulp fiber web, a spunbond nonwoven fabric supply device 3 for supplying a 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.
In the web conveyance direction TD, downstream of these devices 2, 3, and 4, in order from the upstream side, there are a hydroentangling device 5 that injects a water jet for hydroentangling treatment, and a suction device for dehydration treatment. 6. A drying device 7 is provided. A winding device 8 is provided downstream of the drying device 7 to wind up the continuously produced composite nonwoven fabric WP.

The air-laid device 2 is equipped with a defibrator 21 for defibrating the raw material pulp RP, in which the fibers are densely packed together and in the form of a sheet, into pulp fibers, and a blower (not shown) to send the defibrated pulp fibers PF to an air-laid hopper 23. It has a duct 22 for conveying.

Further, an air-laid hopper 23 is arranged downstream of the duct 22. Inside this air-laid hopper 23, the pulp fibers in a defibrated state are designed to descend while being dispersed, and gradually pile up at a stacking position 24 set on the lower surface to form a pulp fiber web PFW.
As mentioned above, the air-laid device 2 is a device that can supply a pulp fiber web in a dry manner, and the equipment cost can be suppressed compared to a device that applies a wet papermaking method to produce a pulp fiber web in a wet manner. In addition, the airlaid device 2 is a closed space from defibration to dispersion and descent of the pulp, which prevents foreign matter from entering. Contamination can be kept to an overwhelmingly low level.

A suction device 4 is disposed opposite to the lower side of the stacking position 24. 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 is applied to the stacking position 24 in order to apply suction force (negative pressure) to the pulp fiber web PFW. It has been set.
In addition, in FIG. 1, the case where the airlaid hopper 23 and the suction device main body 41 are arranged in one stage each to form the pulp fiber web PFW is illustrated. However, the present invention 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 depending on the basis weight or production speed of the pulp fiber web PFW.

Further, a conveyor wire 43 for conveying the web is arranged around the suction device 4. The conveyor wire 43 is arranged so that a pulp fiber web PFW on which pulp fibers PF are deposited can be placed at the stacking position 24, and conveys this to the downstream side. However, the pulp fiber web PFW is not placed directly on the conveying wire 43. This will become clear in the explanation below.
The transport wire 43 is formed in an open-mesh form so that the suction force of the suction part 42 is applied to the opposite side (upper side).

A spunbond nonwoven fabric supply device 3 is disposed below the air-laid device 2 and upstream of the suction device 4. A spunbond nonwoven fabric SW prepared in advance is set in the spunbond nonwoven fabric supply device 3 in the form of a roll. That is, as described above, the designed spunbond nonwoven fabric SW is wound up into a roll shape during manufacturing, and this is pulled out from the spunbond nonwoven fabric supply device 3 and carried on the above-mentioned conveying wire 43 to be rolled. It is conveyed to the stacking position 24.

The above-described pulp fiber web PFW is placed on the spunbond nonwoven fabric SW located at the stacking position 24. At this time, at the stacking position 24, the suction force by the suction section 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, the preliminary laminate PWeb (laminated web) in which the spunbond nonwoven fabric SW and the pulp fiber web PFW are laminated is conveyed to the downstream side.
When the preliminary laminate PWeb is formed as described above, by controlling the amount of pulp fiber web PFW supplied onto the spunbond nonwoven fabric SW, the pulp fibers contained in the composite nonwoven fabric manufactured by this apparatus can be The basis weight of the web PFW is, for example, 30.0 to 125.0 g/m ² , and it is desirable to design it so that the proportion of the pulp fiber web is higher than that of a conventional general composite nonwoven fabric. The basis weight of the spunbond nonwoven fabric SW is, for example, 10.0 to 40.0 g/m ² , and the manufactured composite nonwoven fabric (spunbond nonwoven fabric SW + pulp fiber web PFW) is, for example, 40.0 to 165.0 g/m 2 . It is preferable to set it as ^m2 . By appropriately adjusting the conveyance speed of the pulp fiber web and the supply amount per hour of the pulp fiber web PFW, and checking the basis weight of the pulp fiber web PFW of the manufactured composite nonwoven fabric, the basis weight can be adjusted to the desired range. You can set it so that The conveyance speed of the pulp fiber web is preferably 150 to 300 m/min, for example.

The above-mentioned preliminary laminate PWeb is suction-compressed by the suction force of the suction device 4, so that the laminate state is maintained. At this time, the fibers of the upper pulp fiber web PFW are in a dense state. However, if the preliminary laminate PWeb is transported into the downstream hydroentangling device 5 as it is, there is a risk that some of the pulp fibers PF will be blown up by the water jet (high-pressure water stream).
Therefore, in this manufacturing apparatus 1, a clamping roller 28 is used to sandwich the preliminary laminate PWeb from above and below to stabilize the placement state of the pulp fiber web PFW on the spunbond nonwoven fabric SW, and an upstream of the hydroentangling device 5 is provided. A pre-wetting device 30 for applying moisture to prevent fiber scattering is provided on the side. The prewetting device 30 preferably includes a spray nozzle 31 that sprays water mist from above the preliminary laminate PWeb, and a suction force applied from the lower side of the preliminary laminate PWeb (i.e., the lower surface of the pulp fiber web PFW). It is configured to include 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. For a plurality of sets including a water jet head 51 and a suction device 52, which will be described later, included in the hydroentangling device 5, the design may be changed such that the first set is used as the pre-wetting device 30. 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 a hydroentangling device 5 in which a sufficient number of sets of water jet heads 51 and suction devices 52 are secured to perform hydroentangling processing, the leading water jet head 51 and suction device 52 are Utilizing it as a wet device is effective in reducing device equipment costs.

Then, in the hydroentangling device 5, a high-pressure water jet is sprayed onto the preliminary laminate PWeb that has been processed by the nipping rollers 28 and the pre-wetting device 30, which serve as the pre-processing section, thereby promoting the entanglement of the pulp fibers. This promotes the integration of the pulp fiber web PFW layer located on the upper side and the spunbond nonwoven fabric SW layer located on the lower side (hydroentangling treatment).
In the hydroentangling device 5 exemplarily illustrated in FIG. 1, water jet heads 51 are arranged in multiple stages (four stages are illustrated in FIG. 1) along the conveyance direction TD.
Note that although the state of the nozzles provided in the water jet head 51 extending in the direction perpendicular to the transport direction TD (web width direction CD) is not shown in FIG. Water jet nozzles are placed at appropriate locations. The hole diameter φ of this water jet nozzle is preferably 0.06 to 0.15 mm. Further, the interval between the water jet nozzles is preferably 0.4 to 1.0 mm.

It is desirable that the water pressure used in the hydroentangling treatment is set 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 it in the range of 1 to 30 MPa.

A suction device 52 is disposed to face the water jet head 51. While blowing a high-pressure water jet emitted from a water jet head 51 onto the pulp fiber web PFW located on the upper side, the suction force of a suction device 52 is applied to the lower side of the spunbond nonwoven fabric SW located on the lower side. 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 spunbond nonwoven fabric SW on the lower side, or penetrate the spunbond nonwoven fabric SW and reach the opposite side. It is estimated that a state such as This action promotes the integration of the two layers.

The hydroentangling device 5 is also provided with a conveying wire 55 . The conveying wire 55 receives the preliminary laminate PWeb downstream of the pretreatment section 28 , 30 and conveys it into the hydroentangling device 5 . The conveyance wire 55 is arranged to pass between the water jet head 51 and the suction device 52 of the hydroentangling device 5 from the upstream side to the downstream side.
Therefore, the preliminary laminate PWeb transported on the transport wire 55 is subjected to more hydroentangling treatment as it goes downstream in the transport direction TD, and when it leaves the hydroentangling device 5, the upper pulp fibers are Sufficient entangling of the web PFW layer and the underlying spunbond nonwoven SW layer is achieved.
Immediately after leaving the hydroentangling device 5, the composite nonwoven fabric is in a wet state, and bonds between pulp fibers and the like are not sufficiently established.

Therefore, as shown in FIG. 1, on the downstream side of the hydroentangling device 5, a dehydration process is performed to suction and remove the moisture remaining in the pulp fiber web, followed by a drying process to complete the production of the composite nonwoven fabric WP. A suction device 6 and a drying device 7 are provided. If the dehydration treatment and drying treatment are performed by the suction device 6 and the drying device 7 in the latter stage of the production of the composite nonwoven fabric WP in this way, the composite nonwoven fabric can be efficiently produced, and the composite nonwoven fabric after hydroentangling can be produced efficiently. Dry composite nonwoven fabrics can be produced without applying large external pressure to the fabric.
However, as pointed out earlier, it is necessary to provide a composite nonwoven fabric that can reliably prevent pulp fibers from separating from the pulp fiber web on the composite nonwoven fabric WP. Therefore, the present manufacturing apparatus 1 is provided with an addition device 9 for adding a chemical to prevent the pulp fibers from falling off.

The suction device 6 is a vacuum type, for example, and dehydrates the hydroentangled composite nonwoven fabric from below. A paper strength agent adding device 9 is disposed above the suction device 6 with the composite nonwoven fabric WP being conveyed in between.
The addition device 9 adds a mixed additive containing a paper strength agent and an amphoteric resin from the upper side of the composite nonwoven fabric WP that has been composited in the hydroentangling device 5, that is, from the pulp fiber web PWF. Since the mixed additive is added from the outside to the surface of the pulp fiber web of the composite nonwoven fabric that has been composited, the mixed additive acts efficiently and performs the function of connecting the pulp fibers to each other. Since drying is performed downstream of the paper strength agent addition device 9, there is no waste such as the added mixed additive being washed away and flowing out.
Further, since there is a suction device on the lower side, it is advantageous for the mixed additive to penetrate into the pulp fiber web, and thereby it is possible to further reliably prevent the pulp fibers from falling off. When the additive is added by spray application, the mixed additive in the form of a sprayed liquid permeates into the pulp fiber web, which is more advantageous. In the addition device 9, it is also possible to easily control the amount of mixed additives by checking the state of the composite nonwoven fabric WP to be manufactured.
In addition, the moisture content of the PWF portion of the pulp fiber web (inlet moisture % immediately before entering the addition device 9) when the mixed additive is spray applied by the addition device 9 is adjusted to be 120 to 400%. is preferable.
Further, it is preferable to perform dehydration treatment within 10 seconds after spraying the mixed additive. That is, as explained with reference to FIG. 1 above, dehydration may be carried out immediately after spray application of the mixed additive, or dehydration may be carried out at a position slightly distant from spray application (within a transport time of 10 seconds). In short, the optimal time (within 10 seconds after spray application) may be appropriately determined by checking the state of permeation and diffusion of the chemical into the pulp fiber web PWF when the mixed additive is spray applied.
As the addition device 9, the mixed additives can be added using a known device such as spray coating, size press, roll coating, gravure coating, rod bar coating, air knife coating, etc. Although not particularly limited here, spray coating is preferred.
Although the above-mentioned addition device 9 is described as a preferred example of applying a mixed additive prepared by pre-mixing a paper strength agent and an amphoteric resin to the pulp fiber web PWF, the application form is not limited to this. . The paper strength agent and the amphoteric resin may be applied separately to the pulp fiber web PWF. In this case, the addition device 9 is configured as a device that includes both a first coating device that coats the paper strength agent and a second coating device that coats the amphoteric resin. Here, the first coating device and the second coating device may apply the respective chemicals (paper strength agent and amphoteric resin) at the same time, or the first coating device and the second coating device may apply the respective chemicals (paper strength agent and amphoteric resin) at the same time. The coating may be applied at a position slightly shifted forward or backward from the second coating device. In this case as well, it is preferable to use spray coating.

In the pulp fiber web PWF, each of the paper strength agent and the amphoteric resin is added so that the amount added in terms of solid content falls within a predetermined range with respect to the solid weight of the pulp fiber web PWF. preferable. Specifically, the amount of the paper strength agent added in terms of solid content is 0.04 to 1.0%, preferably 0.1 to 0.8%, based on the solid weight of the pulp fiber web. shall be. Further, the amount of the amphoteric resin added in terms of solid content is 0.06 to 1.5%, preferably 0.15 to 1.2%, based on the solid weight of the pulp fiber web. The mixing ratio of the paper strength agent and the amphoteric resin is preferably 10/90 to 70/30, more preferably 20/80 to 60/40.
If the amount of the paper strength agent and amphoteric resin added is too small, the effect of preventing fibers from falling off will be reduced; if it is too large, the fibers may be prevented from falling off, but the feel (softness) will be poor.
Further, in the case of spray coating, the concentration of the mixed additive is preferably 0.10 to 2.50%, more preferably 0.70 to 1.50%, and the discharge pressure is preferably 0.1 to 1.0 Mpa. , more preferably spray coating the pulp fiber web PWF at 0.3 to 0.8 MPa. If the pressure is low, the mixed additives will be blown away by the wind generated by the conveyed pulp fiber web, reducing the yield. On the other hand, if the pressure is too high, the pulp fiber web being conveyed bounces off the paper surface, and in this case also, the yield deteriorates.
As the paper strength agent, as mentioned above, those known as wet paper strength agents in the paper manufacturing process are preferably used, and specifically, polyamide epichlorohydrin type, polyamide epoxy type, and polyamide polyamine type. It is preferable to use at least one selected from the group consisting of the following, and it is more preferable to use a polyamide epichlorohydrin type. For example, paper strength agents WS4030, WS4038, WS4027 manufactured by Seiko PMC, etc. can be used. .
As mentioned above, examples of the amphoteric resin include polyacrylamide-based, starch-based, guar gum, etc., but it is preferable to use polyacrylamide-based, and for example, FC8501 manufactured by Seiko PMC, etc. can be used. . By mixing and using the above two types under predetermined conditions, it is possible to effectively suppress fiber shedding and obtain a composite nonwoven fabric that is pleasant to the touch.

A drying device 7 is further installed downstream of the suction device 6 and addition device 9, and the composite nonwoven fabric WP including the pulp fiber web PWF spray-coated with the mixed additive is dried. The drying device 7 here 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 its circumferential surface is provided with a large number of through holes, so that hot air heated by a heat source (not shown) is directed from the outer periphery of the dryer body to the center. It is best to have a structure where the air is sucked in toward the side.
The composite nonwoven fabric WP continuously produced in this way is wound up on the roll 81 of the winding device 8 after drying.
As explained above, with the manufacturing apparatus 1, it is possible to obtain the composite nonwoven fabric with less pulp fiber shedding according to the present invention.

(Example)
Examples and comparative examples of the composite nonwoven fabric of the present invention will be described below.
The basis weight of the composite nonwoven fabric, the respective addition amounts and mixing ratios of the paper strength agent and amphoteric resin that are mixed and added to the pulp fiber web PFW are as shown in Table 1.The composite nonwoven fabric of Examples 1 to 3 , and Comparative Examples 1 to 4 thereof, were subjected to sensory evaluation during use regarding the small amount of shedding fibers (inhibition of pulp fiber shedding) and feel (softness) of the composite nonwoven fabrics.
Note that WS4030 (polyamide epichlorohydrin type) manufactured by Seiko PMC Co., Ltd. was used as the paper strength agent, and FC8501 (polyacrylamide type) manufactured by Seiko PMC Co. was used as the amphoteric resin. Further, in all of the composite nonwoven fabrics, Southern pine is used for the pulp fiber web.

1) Fewer fallen fibers: Number of fallen fibers of composite nonwoven fabric One sample piece measuring 19.8 cm long x 21.0 cm wide was folded back and stacked on top of each other with the vertical direction as the axis so that the pulp sides faced each other. Holding both lateral ends with both hands, rub together in 1.5 liters of water with a force of 150 to 200 gf approximately in the lateral direction 30 times in a width of 10 cm, and count the number of pulp fibers in the resulting slurry using a fiber tester ( 300 ml per measurement x 5 measurements, totaling the 5 measurement results). This test was performed five times, and the average value of the measurement results of the number of pulp fibers was taken as the number of fallen fibers.
The evaluation was as follows: Pulp fiber count less than 4,000: Easy to use with few fallen fibers (Excellent)
Number of pulp fibers is 4,000 or more and less than 10,000: No problem level (good)
Pulp fiber count is 10,000 or more: Difficult to use due to many fallen fibers (not allowed)
2) Texture (softness): Texture and softness when composite nonwoven fabric is used for wipes.Soft and feels good when used (Excellent◎)
It feels a little hard, but it can be used without any problems (Good)
Hard and has poor usability (not acceptable)

As shown in Table 1 above, in Examples 1 to 4, the basis weight of the composite nonwoven fabric is 40.0 to 165.0 g/m ² . In addition, the amount of the paper strength agent added in terms of solid content is 0.04 to 1.0%, and the amount of the amphoteric resin added is 0.06 to 1.0%, based on the solid weight of the pulp fiber web. Composite nonwoven fabrics were formed with a concentration of 1.5%, and Examples 1 to 4 can be provided as products.
On the other hand, Comparative Examples 1 to 4 failed in either the ability to prevent fiber shedding or the sensory evaluation of touch (softness).
In Comparative Examples 1 and 2, it can be confirmed that if the mixing conditions of the paper strength agent and the amphoteric resin are inappropriate, the effect of suppressing fiber shedding is reduced.
In addition, Comparative Example 3 shows that if the amount of paper strength agent and amphoteric resin is insufficient, the effect of suppressing fiber shedding will be reduced, and Comparative Example 4 shows that if the amount of paper strength agent and amphoteric resin is excessive, the effect of suppressing fiber shedding will be reduced. However, it has been confirmed that this results in a composite nonwoven fabric that has a poor feel to the touch.

This concludes the description of the embodiments, but it goes without saying that the present invention is not limited to the above embodiments, and can be implemented with various changes without departing from the gist thereof.

1 Composite 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 9 Addition device 21 Defibrator 22 Duct 23 Airlaid hopper 24 Stacking position 28 Holding roller 30 Prewet device 31 Spray nozzle 32 Suction device 41 Suction device main body 42 Suction part 43 Conveyance wire 51 Water jet head 52 Suction device 55 Conveyance wire SW Spunbond nonwoven fabric PF Pulp fiber PFW Pulp fiber web PWeb Preliminary laminate (laminated web)
WP Composite nonwoven fabric TD Conveyance direction CD Width direction

Claims (5)

A composite nonwoven fabric in which a pulp fiber web obtained by an air-laid method is laminated and integrated on a spunbond nonwoven fabric,
The pulp fiber web contains a paper strength agent and an amphoteric resin, and the amount of the paper strength agent added in terms of solid content is 0.04 to 1.0% based on the solid weight of the pulp fiber web, and A composite nonwoven fabric characterized in that the amount of the amphoteric resin added in terms of solid content is 0.06 to 1.5%. The composite nonwoven fabric according to claim 1, wherein the mixing ratio of the paper strength agent and the amphoteric resin is 10/90 to 70/30. The composite nonwoven fabric according to claim 1 or 2, wherein the paper strength agent is at least one selected from the group consisting of polyamide epichlorohydrin, polyamide epoxy, and polyamide polyamine. 4. The composite nonwoven fabric according to claim 1, wherein the amphoteric resin is at least one selected from the group consisting of polyacrylamide, starch, and guar gum. The composite nonwoven fabric according to any one of claims 1 to 4, having a basis weight of 40.0 to 165.0 g/m ² .

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