JP2020128602A - Composite non-woven fabric and manufacturing method thereof - Google Patents

Abstract

To provide a composite non-woven fabric which has improved durability and dimension stability in a lateral direction and is excellent in appearance.SOLUTION: A composite non-woven fabric WP is formed by integrally laminating a pulp fiber web PFW on a spun-bonded non-woven fabric SW. The spun-bonded non-woven fabric SW is formed to include multiple fusion splices MP that connect the spun resin fibers. When a direction of the spun yarn is a vertical direction LL while a direction perpendicular to the vertical direction is a lateral direction TL, the fusion splices MP are disposed on the spun-bonded non-woven fabric SW so that the fusion splices MP seamlessly exist in the side projection configuration when the spun-bonded non-woven fabric SW is seen in the vertical direction LL.SELECTED DRAWING: Figure 1

Description

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

A composite type non-woven fabric composed of a pulp fiber web and a spunbonded non-woven fabric is provided with both liquid absorption based on pulp fibers and strength based on the spunbonded non-woven fabric, and therefore, an industrial wiper such as a waste cloth, or a towel or towel. Widely used in various applications such as wipers for personal use.

For example, as disclosed in Patent Document 1, a pulp fiber web and a spunbonded non-woven fabric are superposed, and then integrated by a hydroentangling treatment in which a high-pressure water jet (waterflow) is sprayed. Here, since the spunbonded nonwoven fabric has excellent strength, it functions as a backing layer for the produced composite nonwoven fabric. On the other hand, the pulp fiber web has an excellent liquid absorbing function. Therefore, such a composite-type nonwoven fabric has an advantage that it has the advantages of a pulp fiber web having good absorbability against both aqueous and oily liquids and a spunbonded nonwoven fabric having excellent strength. It can be provided to consumers as a non-woven fabric.

Japanese Patent No. 2533260

Regarding the spunbonded nonwoven fabrics used in Patent Document 1 and the like (referred to as non-woven continuous filament support in Patent Document 1), those obtained by spunbonding a synthetic resin such as polypropylene are widely used. Has been adopted. In the spunbond process, spun resin fibers are connected to each other at a plurality of points by fusion-bonding portions (hereinafter referred to as fusion-bonding points). As a result, the spunbonded nonwoven fabric develops sheet strength and maintains its outer shape.

The fusion point is a fusion-bonded portion in which resin fibers are melted and solidified, and is dispersed and arranged throughout the spunbonded nonwoven fabric, and is an important constituent part for obtaining the strength of the spunbonded nonwoven fabric. However, as described above, the composite type nonwoven fabric obtained by hydroentangling the spunbonded nonwoven fabric and the pulp fiber web has an improvement pointed out below.
First, the resin fibers (filaments) spun in the spunbond process are aligned along the fiber spinning direction during production (that is, the fiber flow direction, hereinafter referred to as the longitudinal direction). In the spunbonded nonwoven fabric in which the fibers are connected at the fusion point as described above, there is a difference in elongation between the longitudinal direction and the width direction (transverse direction) perpendicular to the longitudinal direction.

As described above, the composite non-woven fabric formed by the spunbonded non-woven fabric and the pulp fiber web, which have different elongations in the longitudinal and transverse directions, has a difference between the longitudinal strength and the lateral strength. When such a composite non-woven fabric is used as a wiper product, for example, when it is used for wiping off dirt, if the object to be wiped has irregularities, it is easily torn in the lateral direction and the durability in the lateral direction is poor. This wiper product has a difference in elongation rate in the vertical and horizontal directions. For example, when it is used by being wet with water, the shrinkage in the horizontal direction is large, and it appears as a dimensional change during the use of the product, which causes the user's usability to deteriorate. Was there.

As described above, the difference in elongation between the longitudinal direction and the lateral direction in the spunbonded nonwoven fabric affects the composite nonwoven fabric using the same. Therefore, for example, it is conceivable to use a spunbonded nonwoven fabric improved so as to increase the strength in the lateral direction. In order to increase the strength of the spunbonded nonwoven fabric in the lateral direction, it is easily conceived to increase the arrangement density of the fusion bonding points in the lateral direction.
However, even if the lateral strength of the spunbonded nonwoven fabric itself is simply increased by increasing the number of fusion points distributed in the lateral direction of the spunbonded nonwoven fabric, the spunbonded nonwoven fabric and the pulp fiber web are hydroentangled. The strength of the obtained composite-type nonwoven fabric in the transverse direction was not necessarily high (the elongation in the transverse direction was small). That is, even if a composite-type nonwoven fabric was produced by using a spunbonded nonwoven fabric modified by increasing the number of fusion points in the lateral direction to reduce the elongation in the lateral direction, the expected sufficient effect could not be obtained.

Also, when the pulp fibers of the pulp fiber web are hydroentangled with the spunbond nonwoven fabric, the pulp fibers are difficult to get entangled at the fusion points, and the entanglement becomes insufficient and it looks like a small hole, so the spunbond has many fusion points. There is also a problem that the composite type non-woven fabric produced using the non-woven fabric is inferior in surface feeling (appearance).

Therefore, it is an object of the present invention to provide a composite non-woven fabric having improved lateral durability and dimensional stability and excellent appearance.

The above-mentioned object is a composite type nonwoven fabric in which pulp fiber webs are laminated and integrated on a spunbonded nonwoven fabric, and the spunbonded nonwoven fabric is formed by including a plurality of fusion bonding points for connecting spun resin fibers. That is, the spinning direction is the longitudinal direction, and the direction orthogonal to the longitudinal direction is the transverse direction, and the spunbonded nonwoven fabric is viewed in the longitudinal direction in a side projection configuration. As described above, the fusion bonding point is arranged on the spunbonded non-woven fabric.

In the spunbonded non-woven fabric, it is preferable that the fusion points are arranged so that the figure connecting the barycentric positions of the fusion points draws a checkered pattern or a regular hexagonal pattern.
By arranging the fusion points of the spunbonded non-woven fabric as described above, a composite type non-woven fabric in which pulp fiber webs are laminated and integrated on the spunbonded non-woven fabric is difficult to break in the lateral direction when used and used by being wet with water. The dimensional change in the lateral direction at the time of doing is small, and the usability is good.

Further, the spunbonded nonwoven fabric has a force required for stretching 10 mm in the lateral direction of 1.2 to 4.5 N/when a test piece of the spunbonded nonwoven fabric formed to have a width of 25 mm is tested by a Tensilon tensile tester. It is preferably set to be 25 mm.
By setting the strength of the spunbonded non-woven fabric to the above range, in the composite type non-woven fabric in which the pulp fiber web is laminated and integrated with the spunbonded non-woven fabric, it is difficult to tear in the lateral direction at the time of use, and the width when it is wet and used. The dimensional change in the direction is small and the usability is good.

Further, the fusion points are formed in a horizontally long polygonal shape or an elliptical shape, and the area of one of the fusion points is 0.10 to 0.50 mm ² , and the area ratio per unit area is It is 6.0 to 18.0%, and the distance between the centers of gravity from one fusion point to the closest fusion point is preferably 1.00 to 3.00 mm.
By setting the fusion point characteristics of the spunbonded nonwoven fabric to the above range, the strength of the spunbonded nonwoven fabric can be designed in an appropriate range, and the spunbonded nonwoven fabric is laminated with a pulp fiber web to be integrated. In the composite non-woven fabric, the surface feeling of the composite non-woven fabric becomes good.

Further, it is preferable that the number of the fusion points is 10 to 150 points/cm ² .
Further, it is preferable that the fibers constituting the spunbonded nonwoven fabric have a fiber diameter of 0.6 to 5.6 decitex.
The spunbonded nonwoven fabric/pulp fiber web, which is the weight composition ratio of the spunbonded nonwoven fabric and the pulp fiber web, is preferably 40/60 to 10/90 (wt %).
The basis weight of the pulp fiber web is preferably 30 to 70 g/m ² .
A composite type in which the pulp fiber web is laminated and integrated on the spunbonded nonwoven fabric by setting the spunbonded nonwoven fabric strength to an appropriate range and setting the fiber diameter, fiber web ratio, and basis weight of the spunbonded nonwoven fabric to the above ranges. In the non-woven fabric, the composite non-woven fabric can be made to have a good liquid absorbing property for water, oil, etc. and a good feeling in use.

Then, when the test piece of the composite non-woven fabric formed into a width of 25 mm is the composite non-woven fabric obtained by hydroentangling the spunbonded non-woven fabric and the pulp fiber web with a Tensilon tensile tester, It is preferable that the strength is 21.6 to 44.1 N/25 mm and the lateral strength is 7.8 to 24.5 N/25 mm.
By setting the longitudinal strength and the lateral strength of the composite non-woven fabric within the above ranges, the longitudinal strength and the lateral strength are well balanced, and it becomes difficult to tear in the lateral direction during use.

And when the test piece of the said composite type nonwoven fabric formed in width 25mm is tested by a Tensilon tensile tester, the elongation rate of a longitudinal direction is 20-55%, and the elongation rate of a transverse direction is 30-110%. preferable.
By adjusting the elongation rate in the longitudinal and transverse directions of the composite non-woven fabric in the above range, the balance of the elongation rates in the longitudinal and transverse directions becomes good, and the dimensional change in the transverse direction when used by being wet with water is small, The feeling of use is good.

The above-mentioned object is a method for producing the composite non-woven fabric according to any one of claims 1 to 3, which includes at least a hydroentangling step of hydroentangling the spunbonded non-woven fabric and the pulp fiber web, wherein the waterjet entangling step is performed. A water jet nozzle having a hole diameter φ of 0.06 to 0.15 mm and a water jet nozzle spacing of 0.4 to 1.0 mm. Is also achieved.

According to the present invention, it is possible to provide a composite non-woven fabric having improved lateral durability and dimensional stability and an excellent appearance.

It is the figure shown typically in order to demonstrate the arrangement pattern of the fusion bonding point in the spun bond nonwoven fabric used for the composite-type nonwoven fabric concerning this invention. It is the figure shown similarly to FIG. 1 about the case where the arrangement pattern of the fusion bonding points is a regular hexagonal type. It is the figure shown about the arrangement pattern at the time of making an edge part of a fusion point overlap. It is the figure shown about the arrangement pattern in which the fusion point is inclined. It is the figure shown about the manufacturing device of the composite type nonwoven fabric concerning the present invention.

Hereinafter, a composite non-woven fabric according to an embodiment of the present invention will be described with reference to the drawings. The composite non-woven fabric according to the present invention is a non-woven fabric obtained by laminating a pulp fiber web on a spunbonded non-woven fabric and integrating them. Since the spunbonded non-woven fabric used has a characteristic constitution, the constitution at this point will be described.

The present inventor has studied the problem in detail with respect to the fusion point provided in the above spunbonded non-woven fabric, and does not simply increase the number in the transverse direction or increase the area ratio, but the fusion point. By devising the shape and arrangement of the, it is possible to improve the durability in the lateral direction of the composite type nonwoven fabric produced by hydroentangled pulp fiber web, and at the same time, the elongation rate in the lateral direction is small and the usability is good. The inventors have found that a composite non-woven fabric having an excellent appearance can be obtained.

The fusion point in the spunbonded nonwoven fabric used in the composite nonwoven fabric according to the present invention will be described with reference to FIG. FIG. 1 is a schematic view showing a part of the spunbonded nonwoven fabric SW in an enlarged manner for explaining the arrangement pattern of the fusion bonding points.
In FIG. 1, reference numeral LL indicates the longitudinal direction (spinning direction) of the spunbonded nonwoven fabric, and reference numeral TL indicates the transverse direction (width direction of the spunbonded nonwoven fabric) perpendicular to the longitudinal direction. is there.
Regarding the arrangement pattern of the fusion points MP shown in FIG. 1, a particularly characteristic point is that the fusion points MP appear to be seamless in the side projection configuration in which the spunbonded nonwoven fabric SW is viewed in the longitudinal direction LL. It is located in. More specifically, when viewed in the side view configuration of the spunbonded nonwoven fabric in the direction of the arrow Y-Y shown in FIG. 1 (that is, the longitudinal direction LL), the fusion point is formed so as not to be interrupted in the projected view. MP is arranged.

The fact that the fusion points MP exist in the side projection configuration without interruption in the above can be clearly understood when compared with the side projection configuration viewed in the lateral direction TL. In the case of the horizontal direction TL, it can be confirmed that the portion of the horizontal arrow X shown in FIG. 1 has a portion where the fusion point MP is interrupted (hereinafter referred to as a non-fusion portion). Thus, in the side projection configuration in the lateral direction TL, the fusion point MP is interrupted.
In the spunbonded non-woven fabric used in the composite non-woven fabric according to the present invention, it is essential that the fusion bonding points MP be present without interruption in the side projection configuration viewed in the longitudinal direction LL, but in the transverse direction TL, FIG. As shown in FIG. 3, there is a non-fused part. However, similar to the vertical direction LL, the side projection structure in the horizontal direction TL may have a structure in which the fusion points MP are seamlessly present.

Regarding the shape of the fusion-bonding points MP to be arranged, as shown in FIG. 1, it is preferable that the fusion-bonding point MP is a horizontally long figure that is elongated in the lateral direction TL. By thus forming a horizontally long figure, it is possible to suppress the number of fusion points MP arranged in the horizontal direction TL. It is preferable that the horizontally long figure has a polygonal shape such as a rectangle or an elliptical shape. Then, it is preferable to arrange the plurality of fusion points MP so that the figure connecting the positions of the centers of gravity of the fusion points MP draws a checkered pattern or a regular hexagonal pattern.
In FIG. 1, the fusion points MP have a rectangular shape, and the fusion points MP located at the front and rear in the vertical direction LL are arranged so as to be offset from each other in the horizontal direction TL by a so-called checkered pattern. , A pattern in which a plurality of fusion points MP are arranged is illustrated (see the polygonal line connecting the centroid positions of the fusion points MP).
Then, FIG. 2 exemplifies a case in which the figure connecting the positions of the centers of gravity of the fusion points MP is arranged so as to draw a regular hexagonal arrangement pattern (the polygonal line connecting the positions of the centers of gravity of the fusion points MP is reference).

Further, as shown in FIG. 3, the arrangement of the fusion points MP is such that when the side surface configuration of the spunbonded nonwoven fabric is viewed in the direction of the arrow Y-Y, there are portions VL that overlap each other at the ends. The landing point MP may be arranged.
Furthermore, as shown in FIG. 4, the fusion point MP, which has a long shape in the lateral direction TL, may be inclined. In short, when the side surface configuration of the spunbonded nonwoven fabric is viewed in the direction of the arrow Y-Y (longitudinal direction), the fusion bonding points MP may be arranged so that there is no break in the projected view. The inclination angles and the inclination directions of all the fusion points MP may not be the same.
Further, FIGS. 1 to 4 described above exemplify the case where the shapes of the fusion points MP are arranged in the same manner as a more preferable form, but for example, a rectangular fusion point MP and an elliptical fusion point MP May be mixed.

As described above, the composite nonwoven fabric produced by hydroentangling the spunbonded nonwoven fabric and the pulp fiber web, which are arranged so that the fusion point is not interrupted in the vertical side projection configuration, has improved lateral strength and It is possible to obtain a composite non-woven fabric that is difficult to stretch in the lateral direction and has improved dimensional stability.
According to the present invention, the lateral strength of the composite non-woven fabric is increased without increasing the area ratio of the fusion points (without increasing the area of one fusion point or increasing the number thereof) to improve the durability. By improving it, suppressing lateral expansion and improving dimensional stability, it is difficult to tear in the lateral direction, it has a good feeling of use, and it has excellent surface feeling (appearance) (with few small holes). A composite non-woven fabric suitable for a wiper can be obtained.

As described above, the shape of the fusion point MP is preferably a horizontally long polygonal shape or a horizontally long elliptical shape, and the area of one of the fusion points is 0.10 to 0.50 mm ² . The area ratio per unit area is preferably set to 6.0 to 18.0%. Further, it is preferable that the distance between the centers of gravity from one fusion point to the closest fusion point is set to 1.00 to 3.00 mm. Here, the closest fusion point from one fusion point is, for example, four points in four diagonal directions in FIG. 1 and four points in four diagonal directions and two points on the left and right in FIG. This is the fusion point.
Further, the fusion point MP is preferably 10 to 150 pieces/cm ² per unit area.
By setting the fusion point characteristics of the spunbonded nonwoven fabric to the above range, the strength of the spunbonded nonwoven fabric can be designed in an appropriate range, and the spunbonded nonwoven fabric is laminated with a pulp fiber web to be integrated. In the composite non-woven fabric, the surface feeling of the composite non-woven fabric becomes good.

In the composite non-woven fabric of the present invention, the pulp fiber web is laminated and integrated on the spunbonded non-woven fabric satisfying the above-described conditions. The basis weight of the pulp fiber web used in the present composite non-woven fabric is set to 30 to 70 g/m ² .
The weight composition ratio of the spunbonded nonwoven fabric and the pulp fiber web (spunbonded nonwoven fabric/pulp fiber web) is preferably 40/60 to 10/90 (wt %).
The fiber diameter of the fibers forming the spunbonded nonwoven fabric is more preferably 0.6 to 5.6 decitex.
A composite type in which the pulp fiber web is laminated and integrated on the spunbonded nonwoven fabric by setting the spunbonded nonwoven fabric strength to an appropriate range and setting the fiber diameter, fiber web ratio, and basis weight of the spunbonded nonwoven fabric to the above ranges. In the non-woven fabric, the composite non-woven fabric can be made to have a good liquid absorbing property for water, oil, etc. and a good feeling in use.
As the spunbonded non-woven fabric, when a test piece formed to have a width of 25 mm is tested with a Tensilon tensile tester, a force required to stretch 10 mm in the lateral direction is 1.2 to 4.5 N/25 mm. Preferably.
By setting the strength of the spunbonded non-woven fabric to the above range, in the composite type non-woven fabric in which the pulp fiber web is laminated and integrated on the spunbonded non-woven fabric, it is difficult to tear in the lateral direction at the time of use, and the width when wetted with water is used. The dimensional change in the direction is small and the usability is good.
In the composite non-woven fabric according to the present invention, it is preferable to form the pulp fiber web by using pulp having an average fiber length of 1.0 to 5.0 mm. Specifically, it is preferable to form the pulp fiber web 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. .. A pulp fiber web made of any one of the pulp fibers may be used, or a pulp fiber web formed by mixing two or more may be used.
Further, the synthetic fiber constituting the spunbonded nonwoven fabric can be selected from nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, polystyrene and the like, and polypropylene is preferably used.

The composite non-woven fabric of the present invention has a longitudinal strength of 21.6 to 44.1 N/25 mm and a lateral strength of 7.8 to 24.5 N when a test piece formed to have a width of 25 mm is tested by a Tensilon tensile tester. /25 mm is preferable. Then, when the above test piece is tested by a Tensilon tensile tester, it is preferable that the elongation percentage in the longitudinal direction is 20 to 55% and the elongation percentage in the lateral direction is 30 to 110%.
By setting the longitudinal, transverse strength, longitudinal and transverse elongation rates of the composite non-woven fabric within the above ranges, the longitudinal and transverse strength balance and the longitudinal and transverse elongation rates are well balanced. It is hard to tear and has a small dimensional change in the lateral direction when it is used by being wet with water, resulting in a good usability.

(Example)
Furthermore, regarding the composite type non-woven fabrics of Examples 1 to 3 and their comparative examples 1 to 3 produced by using the spunbonded non-woven fabric in which the fusion bonding point according to the above conditions is set, when used as a wiper, the transverse direction Sensory evaluation was performed on the improved durability, the feeling of use, and the appearance. The durability was evaluated based on the following criteria as the degree of difficulty in tearing in the lateral direction, and the feeling of use was evaluated in terms of the degree of difficulty in deformation in the lateral direction (dimensional stability).
Durability: Difficult to tear in the lateral direction Difficult to tear the composite non-woven fabric when wiped with a composite non-woven fabric wiper using spunbonded non-woven fabric under the above conditions. (Good), easy to tear and difficult to use (impossible x).
Usability: Difficult to deform in the lateral direction When used in water, the dimensional change in the lateral direction is small and easy to use (excellent ◎), the dimensional change is a little annoying but can be used without problems (good ◯), dimensions The change is large and it is difficult to use (impossible ×).
Appearance evaluation: Evaluation was made based on the presence or absence of small holes on the surface of the composite type nonwoven fabric (portions where the fusion bonding points of the spunbonded nonwoven fabric are exposed).
Particularly excellent (excellent ◎), problem-free appearance (good ◯), and appearance with small holes conspicuous and poor appearance (impossible ×).

Regarding Examples 1 to 3 and Comparative Examples 1 to 3, transverse strength, one area of fusion points (mm ² ), area ratio (%), distance between fusion points (mm), arrangement of fusion points As to the wiper, the spunbonded non-woven fabrics having the shapes of the fusion points are set as shown in Tables 1 and 2 below, and the pulp fiber web produced by the air laid apparatus is placed on the composite type non-woven fabric. It evaluated using.
A Tensilon universal tester (product name/type name: RTF-1250) manufactured by A&D Co., Ltd. was used as a tester for measuring the elongation and strength of the spunbonded nonwoven fabric and the composite type nonwoven fabric. The test method was performed according to JIS P8113, and the distance between the grips of the tensile tester was 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 3 can be provided as products, but Comparative Examples 1 to 3 shown in Table 2 are resistant to tearing in the lateral direction (durability) and feeling of use (in the lateral direction). Deformability, shape stability) and sensory evaluation of appearance evaluation were not possible.
According to Examples 1 to 3 above, the arrangement pattern of the fusion points is a checkered pattern or a regular hexagonal shape and the shape is a rectangle or an ellipse, and the area of one fusion point is 0.10 to 0.50 mm ^2. And the area ratio of the fusion points is 6.0 to 18.0%, and the distance between the centers of gravity from one fusion point to the closest fusion point is 1.00 to 3.00 mm. ing.
When tested with a Tensilon tensile tester, the spunbonded nonwoven fabric has a force required to stretch 10 mm in the transverse direction in the range of 1.2 to 4.5 N/25 mm. The composite non-woven fabric has a longitudinal strength of 21.6 to 44.1 N/25 mm and a transverse strength of 7.8 to 24.5 N/25 mm, and has a longitudinal elongation rate of 20 to 55% and a lateral direction. The elongation is in the range of 30 to 110%.

Hereinafter, a manufacturing apparatus suitable for manufacturing the above-described composite non-woven fabric according to the present invention will be described with reference to the drawings.
First, the schematic configuration of the composite type nonwoven fabric manufacturing apparatus 1 will be described. The manufacturing apparatus 1 shown in FIG. 5 is provided with an airlaid device 2, a spunbonded nonwoven fabric supply device 3 for supplying a spunbonded nonwoven fabric, and a suction device 4 on the upstream side. The suction device 4 is arranged so as to face the lower side of the airlaid device 2.
In the web transport direction TD, a water entanglement device 5, a suction device 6, and a drying device 7 for injecting a water jet for performing a water entanglement treatment are provided downstream from these devices 2, 3, 4 in order from the upstream side. It is arranged. A winding device 8 for winding the continuously manufactured composite type nonwoven fabric WP is further provided downstream of the drying device 7.

The air laid device 2 includes a defibrating machine 21 that defibrates the raw material pulp RP in a sheet form in which the fibers are densely packed into pulp fibers, and a pulp fiber PF that is defibrated with a blower (not shown) to the air laid hopper 23. It has a duct 22 for carrying.

Further, an air-laid hopper 23 is arranged on the downstream side of the duct 22. The airlaid hopper 23 is designed so that pulp fibers in a defibrated state fall while being dispersed, and gradually pile up to form a pulp fiber web PFW at a laminating position 24 set on the lower surface.
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 part 42 on the upper surface of the device main body 41, and the suction part 42 is applied to the stacking position 24 in order to apply a suction force (negative pressure) to the pulp fiber web PFW. It is set.
In addition, in FIG. 5, the 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 is illustrated. However, the arrangement is not limited to this, and the airlaid hopper 23 and the suction device main body 41 may be arranged in two or more stages in accordance with the basis weight (basis weight) of the pulp fiber web PFW and the manufacturing speed.

A transport wire 43 for transporting the web is arranged around the suction device 4. The transport wire 43 can place the pulp fiber web PFW on which the pulp fibers PF are deposited at the stacking position 24, and is arranged to transport the pulp fiber web PFW to the downstream side. However, the pulp fiber web PFW is not directly placed on the transport wire 43. This will become clear in the description below.
The transport wire 43 is formed in a mesh shape so that the suction force of the suction portion 42 extends to the opposite side (upper side).

A spunbonded nonwoven fabric supply device 3 is arranged below the airlaid device 2 and upstream of the suction device 4. In the spunbonded nonwoven fabric supply device 3, a spunbonded nonwoven fabric SW prepared in advance is rolled and set. That is, as described above, the designed spunbonded nonwoven fabric SW is in the form of a roll, which is pulled out from the spunbonded nonwoven fabric supply device 3 and is carried by the above-mentioned carrying wire 43 to the laminating position 24. It is like this.
Further, it is preferable to adjust the spunbonded nonwoven fabric/the pulp fiber web, which is a weight composition ratio of the spunbonded nonwoven fabric and the pulp fiber web, to 40/60 to 10/90 (wt %).

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

The preliminary laminated body PWeb described above is maintained in the laminated state by being suction-compressed by the suction force of the suction device 4. At this time, the fibers of the upper pulp fiber web PFW are in a dense state. However, if the preliminary laminated body PWeb is carried into the hydroentangling device 5 on the downstream side as it is, a part of the pulp fiber PF may be soared by the water jet (high-pressure water flow).
Therefore, in the present manufacturing apparatus 1, a sandwiching roller 28 for stabilizing the mounting state of the pulp fiber web PFW on the spunbonded nonwoven fabric SW by sandwiching the preliminary laminate PWeb from above and below, and the upstream of the hydroentangling device 5. A pre-wetting device 30 is provided on the side for applying moisture to prevent fiber scattering. The pre-wetting device 30 preferably applies a suction force from the spray nozzle 31 for spraying 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). The suction device 32 is included.

Although FIG. 5 illustrates the case where the prewetting device 30 is provided as a new device before the hydroentangling device 5 as described above, the present invention is not limited to this. A plurality of sets of a water jet head 51 and a suction device 52, which will be described later, included in the water entanglement device 5 may be modified in design so that the first set is used as the prewetting device 30. In this case, the water jet head 51 at the head may be adjusted so that low-pressure water mist is sprayed.
In the case of the water entanglement device 5 in which a sufficient number of sets of the water jet head 51 and the suction device 52 are secured to perform the water entanglement treatment, the head water jet head 51 and the suction device 52 are pre-loaded as described above. Utilizing it as a wet device is effective in suppressing the equipment cost.

Then, in the water entanglement device 5, the entanglement of pulp fibers is promoted by spraying a high-pressure water jet onto the preliminary laminated body PWeb which has been subjected to the treatment by the sandwiching roller 28 and the pre-wetting device 30, which are pretreatment parts. This promotes the integration of the pulp fiber web PFW layer located on the upper side and the spunbonded nonwoven fabric SW layer located on the lower side (hydroentanglement treatment).
In the water entanglement device 5 exemplarily shown in FIG. 5, the water jet heads 51 are arranged in multiple stages (four stages are illustrated in FIG. 5) along the transport direction TD.
In FIG. 5, the nozzles provided on the water jet head 51 extending in the direction perpendicular to the transport direction TD (the width direction of the web) are not shown, but a plurality of water are arranged in the width direction. Jet nozzles are arranged at appropriate positions. The hole diameter φ of this water jet nozzle is preferably 0.06 to 0.15 mm. In addition, the interval between the water jet nozzles is preferably 0.4 to 1.0 mm.

It is desirable to set the water pressure during the hydroentangling treatment in consideration of the basis weights of the pulp fiber web PFW and the spunbonded 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 the high-pressure water jet emitted from the water jet head 51 is sprayed on the pulp fiber web PFW located on the upper side, the suction force of the suction device 52 acts on the lower side of the spunbonded 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 side of the pulp fiber web PFW enter the lower spunbonded nonwoven fabric SW or penetrate the spunbonded nonwoven fabric SW to reach the opposite side. It is presumed that a broken state is formed. Its action promotes the integration of the two layers.

A transport wire 55 is also arranged in the water entanglement device 5. The transport wire 55 receives the preliminary laminated body PWeb downstream of the pretreatment units 28 and 30, and transports it into the hydroentangling apparatus 5. The transport wire 55 is arranged so as to pass between the water jet head 51 and the suction device 52 of the water entanglement device 5 from the upstream side toward the downstream side.
Therefore, the preliminary laminated body PWeb transported on the transport wire 55 undergoes more hydroentanglement treatment as it goes downstream in the transport direction TD, and when it exits the hydroentanglement device 5, the pulp fiber on the upper side. A sufficient entanglement treatment of the web PFW layer and the lower spunbonded nonwoven fabric SW layer is realized.
Immediately after leaving the hydroentangling device 5, the nonwoven fabric is in a wet state, and the bond between pulp fibers and the like is not sufficiently established.

Therefore, as shown in FIG. 5, the suction device 6 and the suction device 6 for completing the production of the composite non-woven fabric WP by suctioning and removing the water remaining in the web on the downstream side of the hydroentangling device 5 and then drying the water. A drying device 7 is provided. As described above, when the dehydration and drying are performed by the suction device 6 and the drying device 7 in the latter stage of the production of the composite non-woven fabric, the composite non-woven fabric can be efficiently produced, and the composite non-woven fabric after hydroentanglement produced is large. Since a dry composite type nonwoven fabric can be produced without applying external pressure, it is possible to finish the product with a sense of bulk.
The suction device 6 dewaters the nonwoven fabric after the hydroentanglement by, for example, a vacuum method. As the drying device 7, it is preferable to employ a non-compression type dryer, preferably an air through dryer. In FIG. 5, the rotatable dryer main body 71 of the air through dryer is a cylindrical body, and a large number of through holes are provided on the peripheral surface thereof, so that hot air heated by a heat source (not shown) is passed from the outer periphery of the dryer main body to the central portion. It is recommended that the suction be performed toward the side.
The composite non-woven fabric WP thus continuously manufactured is wound up by the roll 81 of the winding device 8 to complete a series of steps.

According to the apparatus 1 for manufacturing a composite non-woven fabric described above, it is possible to efficiently manufacture the composite non-woven fabric according to the present invention, which has improved lateral durability and dimensional stability and is excellent in appearance.
In the manufacturing apparatus according to FIG. 5, the pulp fiber web is obtained by using the air laid device 2 to defibrate the pulp fibers and gradually stack them. The pulp fiber web can be manufactured by applying the method for manufacturing a wet papermaking sheet. However, when the pulp fiber web is manufactured by the dry method using the airlaid device 2 as described above, the manufacturing facility is simplified and the pulp fiber web is more efficiently produced. The composite non-woven fabric according to the invention can be manufactured.

Although the description of the embodiment has been completed, the present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Manufacturing device for composite non-woven fabric 2 Air-laid device 3 Spun-bonded non-woven fabric feeding device 4 Suction device 5 Hydroentanglement device 6 Suction device 7 Drying device 8 Winding device 21 Fiberizer 22 Duct 23 Airlaid hopper 24 Laminating position 28 Clamping roller 30 Prewet Device 31 Spray Nozzle 32 Suction Device 41 Suction Device Main Body 42 Suction Part 43 Transport Wire 51 Water Jet Head 52 Suction Device 55 Transport Wire SW Spunbond Nonwoven Fabric MP Fusion Point PF Pulp Fiber PFW Pulp Fiber Web PWeb Preliminary Laminate (Laminate Web )
WP Composite non-woven fabric TD Conveying direction LL Vertical direction TL Horizontal direction VL End overlapping part of fusion point

Claims (11)

A composite type nonwoven fabric in which a pulp fiber web is laminated and integrated on a spunbond nonwoven fabric,
The spunbonded non-woven fabric is formed to include a plurality of fusion points connecting spun resin fibers,
The direction of the spinning is the longitudinal direction, the direction perpendicular to the longitudinal direction is the transverse direction, and the side projection configuration of the spunbonded nonwoven fabric seen in the longitudinal direction is such that the fusion points are seamless. The composite non-woven fabric, wherein the fusion bonding point is arranged on the spun-bonded non-woven fabric. 2. The spunbonded non-woven fabric, wherein the fusion bonding points are arranged so that the figure connecting the positions of the centers of gravity of the fusion bonding points draws a checkered pattern or a regular hexagonal pattern. Composite non-woven fabric. When the test piece of the spunbonded nonwoven fabric formed to have a width of 25 mm is tested by a Tensilon tensile tester, the spunbonded nonwoven fabric has a force required to stretch 10 mm in the transverse direction at 1.2 to 4.5 N/25 mm. The composite non-woven fabric according to claim 1 or 2, wherein the composite non-woven fabric is set as described above. 5. The fusion point is formed in a horizontally long polygonal shape or an elliptical shape, and the area of one of the fusion points is 0.10 to 0.50 mm ² , and the area ratio per unit area is 6. It is 0 to 18.0%, and the distance between center of gravity from one fusion point to the nearest fusion point is 1.00 to 3.00 mm, Any one of Claim 1 to 3 characterized by the above-mentioned. The composite non-woven fabric described in. The fusion number of Chakuten is 10 to 150 pieces / cm ^2, composite nonwoven fabric according to any one of claims 1 to 4, characterized in that. The composite type non-woven fabric according to any one of claims 1 to 5, wherein the fiber diameter of the fibers forming the spun-bonded non-woven fabric is 0.6 to 5.6 decitex. 7. The spunbonded non-woven fabric/pulp fiber web, which is the weight composition ratio of the spunbonded non-woven fabric and the pulp fiber web, is 40/60 to 10/90 (wt %). The composite non-woven fabric according to claim 1. 8. The composite non-woven fabric according to claim 1, wherein the pulp fiber web has a basis weight of 30 to 70 g/m ² . The composite type nonwoven fabric obtained by hydroentangling the spunbonded nonwoven fabric and the pulp fiber web,
When a test piece of the composite non-woven fabric formed to have a width of 25 mm was tested by a Tensilon tensile tester,
The composite non-woven fabric according to any one of claims 1 to 8, having a longitudinal strength of 21.6 to 44.1 N/25 mm and a lateral strength of 7.8 to 24.5 N/25 mm. When the test piece of the composite non-woven fabric formed to have a width of 25 mm is tested by a Tensilon tensile tester, the elongation rate in the longitudinal direction is 20 to 55%, and the elongation rate in the lateral direction is 30 to 110%. The composite non-woven fabric according to claim 9. A method for producing the composite non-woven fabric according to any one of claims 1 to 10, comprising:
At least including a hydroentangling step of hydroentangling the spunbond nonwoven fabric and the pulp fiber web,
The hole diameter φ of the water jet nozzle that injects the water jet in the water entanglement step is 0.06 to 0.15 mm, and the interval between the water jet nozzles is 0.4 to 1.0 mm. Method for manufacturing composite non-woven fabric.

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