JP2020084385A - Composite type nonwoven fabric wiper and manufacturing method thereof - Google Patents

Abstract

To provide a composite type nonwoven fabric wiper that is excellent in appearance and use feeling.SOLUTION: A composite type nonwoven fabric wiper is made by laminating a pulp fiber web on a spun-bonded nonwoven fabric. The spun-bond nonwoven fabric SW is formed by including multiple fusion points MP. The multiple fusion points MP are disposed linearly and spaced equally on a longitudinal line LL in parallel with a flow direction MD of the nonwoven fabric and a traverse line TL perpendicular to the flow direction, respectively. Spaces on the longitudinal line and the traverse line are set so as to be the same length as each other. The fusion points MP are disposed so that a first distance FD between centers of gravity of the fusion points that are adjacent to each other on the line is different from a second distance SD between centers of gravity of the fusion points that are adjacent in an oblique direction. Area of a fusion point is set to 0.10 to 0.50 mm, area ratio of fusion points to 7 to 20%, shorter one of the first distance and the second distance to 0.70 to 1.80 mm.SELECTED DRAWING: Figure 1

Description

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

A wiper made of a composite type non-woven fabric containing a pulp fiber web and a spunbonded non-woven fabric is a non-woven fabric having both liquid absorption based on pulp fiber and strength based on the spunbonded non-woven fabric. Or, it is widely used for various purposes as a wiper for a person such as a towel or towel.

For example, as disclosed in Patent Document 1, a pulp fiber web and a spunbonded nonwoven 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 manufactured composite nonwoven fabric wiper. On the other hand, the pulp fiber web has an excellent liquid absorbing function. Therefore, such a composite non-woven wiper is an excellent wiper that has the advantages of both a pulp fiber web that has good absorbability for both aqueous and oily liquids and a spunbonded non-woven fabric that has excellent strength. Can be offered to consumers as.

Japanese Patent No. 2533260

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

The fusion point is a portion where the resin fiber is melted and solidified, and is an important constituent portion for obtaining the strength of the spunbonded nonwoven fabric. However, as described above, the composite-type nonwoven fabric wiper obtained by hydroentangling the spunbonded nonwoven fabric and the pulp fiber web has the following improvements.
To obtain a composite non-woven fabric that has moderate strength (durable), less fiber loss during use, and excellent wipeability, and with a good feeling of use, shorten the interval between adjacent fusion points (per unit area). It is conceivable to use a spunbonded non-woven fabric having a large area ratio by increasing the number of fusion points. However, when a composite type nonwoven fabric wiper is manufactured by hydroentangling treatment, the entanglement of pulp fibers to the fusion point of the spunbonded nonwoven fabric tends to be insufficient (pulp fibers are difficult to entangle at the fusion point). Therefore, as the area of one of the fusion bonding points of the spunbonded nonwoven fabric is larger, the portion where the pulp fiber entanglement is insufficient looks like a small hole, so that the appearance (also referred to as surface feeling) of the completed wiper (Seeing) is inferior. On the other hand, if the area of one of the fusion bonding points is small, the spunbonded nonwoven fabric is likely to stretch during production, and the dimensional stability is poor, so that the usability is also deteriorated.
Then, it is conceivable to increase the area of each fusion point and design the interval between adjacent fusion points to be long so as not to change the area ratio of the fusion points per unit area. However, spunbonded non-woven fabrics have high dimensional stability due to high strength at the fusion point and its vicinity, whereas dimensional stability tends to be relatively low in the non-fusion region far from the fusion point. .. Therefore, when the distance between the fusion points becomes long, the region having poor dimensional stability expands, and the fibers drop off during use, which deteriorates the feeling of use.

Further, since there is a strong demand for the wiper to have a liquid absorbing property capable of reliably wiping off water, oil, etc., it may be designed as a composite type non-woven fabric wiper containing sufficient pulp fiber web. desirable.
As described above, in the composite type non-woven wiper made of the spunbonded non-woven fabric and the pulp fiber web, since a plurality of constituent elements affect each other in a complicated manner, conventionally, a wiper having excellent appearance and usability is designed. Was difficult.

Therefore, an object of the present invention is to provide a novel composite non-woven fabric wiper having both excellent appearance and usability.

The above-mentioned object is a composite-type nonwoven fabric wiper in which a pulp fiber web is laminated and integrated on a spunbonded nonwoven fabric,
The spunbonded non-woven fabric is formed to include a plurality of fusion points connecting spun resin fibers,
On each of a plurality of longitudinal lines that are parallel to the flow direction of the spunbonded nonwoven fabric and on a plurality of transverse lines that are perpendicular to the flow direction, straight lines are formed at the same intervals. Multiple fusion points are placed,
The intervals on the vertical line and the horizontal line are set to have the same length as each other,
A first distance, which is the distance between the centroids of the fusion points that are adjacent to each other on the vertical line and the horizontal line, and a distance between the centroids of the fusion points that are adjacent to each other in the diagonal direction. And the fusion point is arranged so as to be different from the second distance,
The area of one fusion point is 0.10 to 0.50 mm ² , and the area ratio of the fusion point is set to 7 to 20%,
The shorter distance of the first distance and the second distance, whichever is shorter, is set to 0.70 to 1.80 mm.

Here, the first distance may be shorter than the second distance.
Further, the first distance may be longer than the second distance.

Further, the above object is a composite-type nonwoven fabric wiper 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,
On each of a plurality of longitudinal lines that are parallel to the flow direction of the spunbonded nonwoven fabric and on a plurality of transverse lines that are perpendicular to the flow direction, straight lines are formed at the same intervals. Multiple fusion points are placed,
The intervals on the vertical lines and the horizontal lines are set to have mutually different lengths,
The first distance, which is the distance between the centers of gravity of the fusion points adjacent to each other on the vertical line, and the distance between the centers of gravity of the fusion points adjacent to each other on the horizontal line. Including a certain second distance and a third distance which is a distance between the centers of gravity of the fusion points adjacent to each other in an oblique direction,
The first distance or the second distance, the fusion point is arranged so that the third distance is the same,
The area of one fusion point is 0.10 to 0.50 mm ² , and the area ratio of the fusion point is set to 7 to 20%,
It is also achieved by the composite non-woven wiper, characterized in that the shorter one of the first distance and the second distance is set to 0.70 to 1.80 mm.

The shape of the fusion-bonding point can be one selected from the group consisting of a circular shape, an elliptical shape, and a polygonal shape.

It is preferable that the shortest distance between the fusion points is set to 0.50 to 1.20 mm.

Further, it is preferable that the number of fusion points is 10 to 150/cm ² .
The fiber diameter of the fibers forming the spunbonded nonwoven fabric is preferably 0.6 to 5.6 decitex.
Further, 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 .

The above-mentioned object is a method for producing the composite non-woven wiper according to any of the above,
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. This is also achieved by the method for manufacturing the composite non-woven wiper.

ADVANTAGE OF THE INVENTION According to this invention, the composite-type nonwoven fabric wiper excellent in an external appearance and a usability can be provided.

It is the figure which showed typically in order to demonstrate the arrangement|positioning pattern of the fusion bonding point in the spun bond nonwoven fabric used for the composite type nonwoven fabric wiper which concerns on this invention, (a) is a perfect alignment type arrangement pattern figure, (b) is It is a checkerboard type arrangement pattern diagram. FIG. 2 is a view similar to FIG. 1 in the case where the shape of a fusion point is elliptical. It is the figure which showed typically in order to demonstrate the other arrangement pattern of the fusion bonding point in the spun bond nonwoven fabric used for the composite type nonwoven fabric wiper which concerns on this invention, (a) is a 1st regular hexagon type arrangement pattern figure. , (B) are layout patterns of the second regular hexagonal type. It is the figure shown about the manufacturing device of the composite type nonwoven fabric wiper concerning the present invention.

Hereinafter, a composite-type nonwoven fabric wiper according to an embodiment of the present invention will be described with reference to the drawings. The composite non-woven fabric wiper according to the present invention is a non-woven fabric in which a pulp fiber web is laminated on a spunbonded non-woven fabric and integrated. Since the spunbonded nonwoven fabric adopted has a characteristic structure, the structure at this point will be described first with reference to FIG.

The present inventor has studied in detail the above-mentioned problems due to the fusion point and designed the arrangement pattern and properties of the fusion points MP formed on the spunbonded nonwoven fabric SW within a predetermined range, thereby providing excellent appearance and usability. The present invention has been completed after confirming that a composite nonwoven fabric can be obtained.
1(a) and 1(b) are enlarged schematic diagrams for explaining an example of the arrangement pattern of fusion points, which is preferably filled with the spunbonded nonwoven fabric used in the composite nonwoven fabric wiper according to the present invention. It is a figure.
In FIG. 1, a flow direction (conveyance direction) MD at the time of manufacturing the spunbond of the spunbonded nonwoven fabric SW and a width direction CD perpendicular to the flow direction MD are shown. A plurality of symbols MP indicate individual fusion points. Here, in order to facilitate understanding of the points of the present invention, for convenience of explanation, the spunbonded nonwoven fabric of FIG. 1A is SW-1, the fusion bonding point is MP-1, and the spunbonded nonwoven fabric of FIG. Is shown as SW-2 and its fusion point as MP-2.

As shown in FIGS. 1A and 1B, any fusion point MP-1 and fusion point MP-2 on the spunbonded nonwoven fabric SW (SW-1, SW-2) are in the flow direction MD. On each of the plurality of vertical lines LL that are parallel to each other and the plurality of horizontal lines TL that are parallel to the width direction CD, straight lines are formed at the same intervals and the fusion points MP (MP-1 And MP-2) are arranged. Moreover, the intervals in the vertical line LL and the width direction CD (the distances between the adjacent fusion-bonding points in the vertical line LL and the horizontal line TL) are the same.
The arrangement pattern of the fusion points shown in FIGS. 1A and 1B has line symmetry and point symmetry, and a plurality of fusion points MP are arranged uniformly over the entire plane. One of the features of the present invention is that the composite type nonwoven fabric is formed by using the spunbonded nonwoven fabric having such a fusion point arrangement pattern.
Further, each pattern shown in FIGS. 1A and 1B will be described in more detail.

The arrangement pattern shown in FIG. 1(a) is a perfect alignment type arrangement pattern in which the fusion points MP are perfectly aligned in the vertical and horizontal directions without any row shift, and for example, one fusion point MP-1a. Focusing on, the four fusion points MP-1, which are vertically and horizontally adjacent to each other, are arranged with a first distance FD. The distance here is a distance between the centers of gravity of fusion points (a circular shape is shown as an example) designed to have a predetermined shape.

Further, focusing on four adjacent fusion points MP-1 in the diagonal four directions AD of the fusion point MP-1a, the fusion points MP-1a and MP-1 have a second distance SD. Are arranged.
In the arrangement pattern of the complete alignment type shown in FIG. 1A, the first distance FD is specified with a characteristic that it is shorter than the second distance SD.

Next, with respect to the perfect alignment type arrangement pattern of FIG. 1A, in the fusion point arrangement pattern shown in FIG. 1B, the positions of the fusion point MP immediately before and immediately after are displaced by a half distance. It is a checkerboard type arrangement pattern arranged in a state. As in the case of FIG. 1A, attention is paid to one fusion point MP-2a, and the distances to the four fusion points MP-2 adjacent to the top, bottom, left, and right are set as the first distance FD, and The distance between the fusion point MP-2a and four adjacent fusion points MP-2 in the four diagonal directions AD is defined as a second distance SD. In the checkerboard type arrangement pattern shown in FIG. 1B, the first distance FD is specified with a characteristic that it is longer than the second distance SD.

In the composite non-woven wiper according to the present invention, the spun bond in which the fusion points are arranged based on the arrangement pattern of the perfect alignment type shown in FIG. 1A or the checkerboard type shown in FIG. SW can be preferably used.
And, the fusion point MP, the area of one piece is 0.10 to 0.50 mm ² , and the area ratio of the fusion point is set to 7 to 20%, and further, the first distance The shorter distance between the FD and the second distance SD is set to 0.70 to 1.80 mm, that is, the first distance FD is 0.70 to 780 in the case of the perfect alignment type shown in FIG. In the checkered pattern of 1.80 mm, and in the case of the checkered pattern shown in FIG. 1B, the second distance SD is set to 0.70 to 1.80 mm, which is taken as a spunbonded nonwoven fabric SW.
When the composite non-woven fabric is formed by hydroentangling using the spunbonded non-woven fabric SW satisfying the above conditions, the composite non-woven fabric wiper excellent in appearance and usability can be obtained.

By the way, in a spunbonded nonwoven fabric, in order to hold the spun resin fibers together, a heating device such as a hot embossing device is used to heat and melt a portion of the resin fiber in spots, and then the solidified portion is fused as described above. It is a point. With respect to the fusion bonding point in the spunbonded nonwoven fabric SW used in the present invention, the preferable arrangement is defined as described above, and there is a preferable shape as well.
However, when microscopically observing the state of the fusion points arranged in the actually manufactured spunbonded nonwoven fabric, there are cases where the fusion points are slightly deviated from the planned positions. Therefore, the shorter distance described above (the first distance FD in the perfect alignment type of FIG. 1A, the second distance SD in the checkerboard type of FIG. 1B) is calculated as follows. preferable. For example, for 25 fusion points with no defects at adjacent fusion points, the distances to the 4 fusion points around the fusion points (total of 100 locations) are measured, and the maximum and minimum values in the 100 locations are measured. When the error range with the value is within 0.30 mm or less, for example, it is considered that the arrangement pattern is the perfect alignment type or the checkered type. Then, the condition for the spunbonded nonwoven fabric is that the average value at 100 locations is 0.70 to 1.80 mm.
In addition, depending on the heating device used, there may be a case where a fusion point different from the expected fusion point shape (for example, a circular shape) or a partially fractured shape (for example, a crescent shape) is confirmed. Therefore, for example, it is preferable to observe 100 fusion points adjacent to each other in a unit area (the unit area varies depending on the spunbonded nonwoven fabric), and it is preferable that 70% or more has a planned regular shape. ..
The spunbonded non-woven fabric satisfying the above conditions can be recognized as a completely aligned type or a checkered type arrangement pattern as a whole in appearance (visually), and has a proper shape designed by the fusion point. Can be regarded as a spunbonded nonwoven fabric.

FIG. 2 shows a case where the shape of the fusion point MP is changed from the circular shape shown in FIG. 1 to an elliptical shape, and FIG. 2A shows a perfect alignment type arrangement pattern corresponding to FIG. 1A. FIG. 2B is a checkerboard type arrangement pattern corresponding to FIG.
Even if the shape of the fusion point MP is changed to an elliptical shape as shown in FIG. 2, the same effect as in the case of a circular shape can be expected. In the case of an elliptical shape, the posture of the ellipse changes by rotating around the center of gravity (center of the figure) (in FIG. 2, the major axis of the elliptical shape is tilted by about 30 degrees). Similarly, if the distance between the centers is constant, the influence of the inclination (rotation angle) of the fusion point MP can be ignored.
Although FIG. 2 illustrates the case where the shape of the fusion point MP is elliptical, it may be formed in a polygonal shape such as a square shape, a pentagon, a hexagon, and a star shape.

Further, with reference to FIG. 3, another example of the arrangement pattern of the fusion bonding points which can be adopted in the spunbonded nonwoven fabric will be described. FIG. 3 is an enlarged schematic view for explaining another example of the arrangement pattern of the fusion bonding points, which is similar to FIG.
The arrangement pattern shown in FIG. 3 can be regarded as a kind of modification of the checkerboard type arrangement pattern shown in FIG. That is, the positions MP of the fusion points MP immediately before and immediately after are shifted by a half distance.

On the other hand, however, as shown in FIG. 3A, the distances between adjacent fusion points on the vertical line LL and the horizontal line TL are set to different lengths. More specifically, when focusing on, for example, one fusion point MP-3a, the lengths of the first distance FD in the vertical line LL and the second distance SD in the horizontal line TL are different. There is. More specifically, the first distance FD is shorter than the second distance SD.
Focusing on the four fusion points MP-3 adjacent to each other in the four diagonal directions AD of the fusion point MP-3a, the fusion point MP-3a and the fusion point MP-3 have the third distance TD. Are arranged. The shorter first distance FD and third distance TD are the same here.
As shown by the broken line in FIG. 3A, the arrangement pattern satisfying such a condition is set such that six fusion points around the fusion point MP-3a have the same central angle with respect to the fusion point MP-3a. The arrangement pattern is the first regular hexagonal type.

And FIG.3(b) has illustrated the case where the length relationship of 1st distance FD and 2nd distance SD is reverse to FIG. 3(a). Specifically, FIG. 3B shows a second regular hexagonal type arrangement pattern diagram in which the second distance SD is shorter than the first distance FD.
Focusing on four adjacent fusion points MP-4 in the four diagonal directions AD of the fusion point MP-4a, the fusion points MP-4a and MP-4 are arranged with a third distance TD. Has been done. The shorter second distance SD and the third distance TD are the same here.
Also in the arrangement pattern satisfying such a condition, as shown by a broken line in FIG. 3B, the six fusion points around the fusion point MP-4a are located at the same center angle. The fused points are arranged so as to form a regular hexagonal shape.
The regular hexagonal shape shown in FIG. 3B is equivalent to a figure obtained by rotating the regular hexagonal shape shown in FIG. 3A by 90 degrees.

In the case of the regular hexagonal pattern arrangement shown in FIG. 3, with respect to one certain fusion point MP, there are six points that are close to the periphery and are at a short distance.
As described above, regarding the specific condition of the distance between the fusion points, in the case of the arrangement illustrated in FIG. 1, for example, about 25 fusion points, the distance between the fusion points at four short distances (total) The distance was measured at 100 places, and the condition was that the maximum value-minimum value (error range) between the 100 distances was within 0.30 mm.
On the other hand, in the case of the arrangement illustrated in FIG. 3, the distance between six fusion points at a short distance (150 in total) is measured and the maximum value between the 150 points is measured. -It is preferable that the minimum value (error range) is 0.30 mm or less.

Other conditions regarding the fusion points MP-3 and MP-4 may be the same as those of the fusion points MP-1 and MP-2 described above. When the composite non-woven fabric is formed by hydroentangling using the spunbonded non-woven fabrics SW-3 and SW-4 which satisfy the above conditions, the composite non-woven fabric wiper excellent in appearance and feeling of use can be obtained similarly.

Further, preferable conditions for the fusion point MP will be described below.
Regarding the fusion points MP, the shortest distance between the fusion points MP closest to each other (distance from the surface of one fusion point MP to the surface of the other fusion point MP adjacent thereto) is 0.50 to 1 It is preferably set to 20 mm.
And, the fusion point is preferably 10 to 150 pieces/cm ² per unit area.

In the composite non-woven fabric wiper of the present invention, the pulp fiber web is laminated and integrated on the spun-bonded non-woven fabric satisfying the conditions described above. The basis weight of the pulp fiber web used in the present composite-type nonwoven fabric wiper is set to 30 to 70 g/m ² . As a result, the composite non-woven fabric wiper of the present invention can be a composite non-woven fabric wiper having not only excellent appearance and feeling of use, but also sufficient liquid absorbency.
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.
In the composite non-woven fabric wiper according to the present invention, it is preferable to form the pulp fiber web 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 fibers constituting the spunbonded nonwoven fabric can be selected from nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, polystyrene and the like, and polypropylene is preferably used.

(Example)
Furthermore, the composite non-woven fabric wipers of Examples 1 to 5 and their comparative examples 1 to 4 manufactured by using the spunbonded non-woven fabrics having the fusion patterns set according to the arrangement pattern and the predetermined conditions illustrated in FIG. The appearance and the feeling of use were evaluated according to the following criteria.
Appearance evaluation: Small holes on the surface of the composite non-woven wiper
It was evaluated by the presence or absence of the part).
Particularly excellent (excellent ⊚), problem-free appearance (good ∘), and small holes with poor appearance (poor ×).
Sense of use: Evaluation was made based on 1) ease of wiping off, and 2) state of fiber dropping.
1) Ease of wiping: Evaluation was made based on the ease of wiping of the composite type nonwoven fabric wiper using the spunbonded nonwoven fabric under the above conditions. Moderately soft and easy to wipe (Excellent ◎), problem-free wiping ease (Good ◯), weak and easy to tear, or too strong and difficult to wipe (No ×).
2) State of falling off of fibers: By visual judgment, the amount of falling off of the fibers was small (good), the amount of falling off of the fibers was large, and left on the object after wiping (impossible x).

Regarding Examples 1 to 5 and Comparative Examples 1 to 4, the arrangement of the fusion points, one area (mm ² ) of the fusion points, the area ratio (%), the shorter distance between the fusion points, and the fusion point Regarding the shape of the above, a spunbonded nonwoven fabric set as shown in Tables 1 and 2 below was used, and a pulp fiber web produced by an air laid apparatus was placed thereon to produce a composite nonwoven fabric wiper.

上記表１に示すように、実施例１〜５は製品ワイパーとして提供できるものであるが、表２に示す比較例１〜４では外観評価、使用感の官能評価のいずれかで不可であった。
上記実施例１〜５によると、融着点の配置パターンが完全整列型或いは市松模様型のいずれかであり、そして融着点１個の面積が０．１０〜０．５０ｍｍ^２であり、且つ、当該融着点の面積率が７〜２０％、また第１距離ＦＤと前記第２距離ＳＤとのいずれかの短い方の距離が０．７０〜１．８０ｍｍの範囲に設定されている。
なお、融着点の形状を円形、楕円、また正方形、長方形、五角形等の多角形としたが、形状についての有意差は確認されなかった。
なお、図３に例示した融着点の配置パターンが正六角型となる場合についても、上記完全整列型および市松模様型と同様の効果を期待することができる。

As shown in Table 1 above, Examples 1 to 5 can be provided as product wipers, but Comparative Examples 1 to 4 shown in Table 2 were unsatisfactory in either appearance evaluation or sensory evaluation of feeling of use. ..
According to the above Examples 1 to 5, the arrangement pattern of the fusion points is either a perfect alignment type or a checkered pattern, and the area of one fusion point is 0.10 to 0.50 mm ² , and The area ratio of the fusion points is set to 7 to 20%, and the shorter one of the first distance FD and the second distance SD is set to 0.70 to 1.80 mm.
Although the shape of the fusion point was a circle, an ellipse, or a polygon such as a square, a rectangle, or a pentagon, no significant difference in shape was confirmed.
Even when the fusion point arrangement pattern illustrated in FIG. 3 is a regular hexagonal shape, it is possible to expect the same effects as those of the perfect alignment type and the checkered pattern type.

Hereinafter, a manufacturing apparatus suitable for manufacturing the above-described composite non-woven fabric wiper according to the present invention will be described with reference to the drawings.
First, the schematic configuration of the nonwoven fabric wiper manufacturing apparatus 1 will be described. The manufacturing apparatus 1 shown in FIG. 4 is provided with an airlaid device 2, a spunbonded nonwoven fabric supply device 3 for supplying 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 of these devices 2, 3, 4 in order from the upstream side. It is arranged. A winding device 8 for winding the composite type nonwoven fabric wiper WP continuously manufactured 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 the form of a sheet in which fibers are closely 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.

An airlaid hopper 23 is arranged downstream of the duct 22. The air laid 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.
The suction device 4 is disposed 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 acts on the stacking position 24 in order to exert a suction force (negative pressure) on the pulp fiber web PFW. It is set.
In addition, in FIG. 4, 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 present invention is not limited to this, and the airlaid hopper 23 and the suction device 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 disposed 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).

Below the airlaid device 2, a spunbonded nonwoven fabric supply device 3 is arranged upstream of the suction device 4. In this spunbonded nonwoven fabric supply device 3, a spunbonded nonwoven fabric SW prepared in advance is set in a roll shape. That is, as described above, the span in which the fibers are connected by the fusion points satisfying the condition that the area is relatively smaller than that of the conventional spunbonded nonwoven fabric and the area ratio is within the predetermined range. The bonded 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 to the laminating position 24 by riding on the above-mentioned carrier wire 43.
In addition, it is preferable that the weight composition ratio of the spunbonded nonwoven fabric and the pulp fiber web, that is, the spunbonded nonwoven fabric/the pulp fiber web, is adjusted 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 contained in the composite nonwoven fabric wiper manufactured by this device is controlled. The fiber web PFW is designed to have a basis weight of 30 to 70 g/m ² . As for the basis weight of the pulp fiber web PFW, the transport speed of the web and the amount of the pulp fiber web PFW supplied per hour are appropriately adjusted, and the basis weight of the manufactured composite non-woven wiper pulp fiber web PFW is confirmed. Then, the basis weight may be set to fall within a desired range.

The preliminary laminated body PWeb described above is maintained in a 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 manufacturing apparatus 1, a sandwiching roller 28 for sandwiching the preliminary laminated body PWeb from above and below to stabilize the placement state of the pulp fiber web PFW on the spunbonded nonwoven fabric SW, and an upstream of the hydroentangling apparatus 5. A pre-wetting device 30 is provided on the side to add moisture to prevent fiber scattering. The pre-wetting device 30 preferably applies suction force from the spray nozzle 31 for spraying water mist from above the preliminary laminate PWeb and from the lower side of the preliminary laminate PWeb (that is, the lower surface of the pulp fiber web PFW). The suction device 32 is included.

Although FIG. 4 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 changed in design so that the set located at the head 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 ensured for performing the water entanglement treatment, as described above, the water jet head 51 and the suction device 52 at the head are pre-loaded. Utilizing it as a wet device is effective in suppressing the equipment cost.

Then, in the water entanglement device 5, the high pressure water jet is blown to 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 the pretreatment section, thereby promoting the entanglement of pulp fibers. 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. 4, the water jet heads 51 are arranged in multiple stages (four stages are illustrated in FIG. 4) along the transport direction TD.
Although FIG. 4 does not show the state of the nozzles provided in the water jet head 51 extending in the direction (web width direction) perpendicular to the transport direction TD, a plurality of water jet heads 51 are provided 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. The water jet nozzle spacing 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. The suction force of the suction device 52 is applied to the lower side of the spunbonded nonwoven fabric SW located on the lower side while spraying the high-pressure water jet emitted from the water jet head 51 onto the pulp fiber web PFW located on the upper 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 laminate PWeb downstream of the pretreatment units 28 and 30, and transports the preliminary laminate PWeb into the hydroentanglement device 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 hydroentangling treatment as it goes downstream in the transport direction TD, and when it exits the hydroentangling 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. 4, the water remaining on the web is sucked and removed downstream of the hydroentangling device 5, and then dried to complete the production of the nonwoven fabric wiper WP and a suction device 6 and a drying device. Device 7 is deployed. Thus, by performing dehydration and drying by the suction device 6 and the drying device 7 in the subsequent stage of the production of the nonwoven fabric wiper WP, the nonwoven fabric can be efficiently produced, and the produced nonwoven fabric after the hydroentanglement is not subjected to a large external pressure. Since a dried nonwoven fabric can be manufactured, it can be finished into a product with a feeling of bulk.
The suction device 6 is, for example, of a vacuum type and dehydrates the nonwoven fabric after the hydroentangling. As the drying device 7, it is preferable to adopt a non-compression type dryer, preferably an air through dryer. In FIG. 4, the rotatable dryer main body 71 of the air through dryer is a tubular body, and a large number of through holes are provided on the peripheral surface thereof, and 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-type nonwoven fabric wiper WP continuously manufactured in this manner is wound around the roll 81 of the winding device 8 to complete a series of steps.

According to the nonwoven fabric wiper manufacturing apparatus 1 described above, it is possible to efficiently manufacture the composite nonwoven fabric wiper according to the present invention, which is excellent in appearance and usability and has sufficient liquid absorption.
In the manufacturing apparatus according to FIG. 4, the pulp fiber web is obtained by using the air laid apparatus 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 air-laid device 2 as described above, the manufacturing facility is simplified and the pulp fiber web is more efficiently produced. The composite non-woven wiper 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 Nonwoven fabric wiper manufacturing device 2 Airlaid device 3 Spunbond nonwoven fabric supply device 4 Suction device 5 Hydroentanglement device 6 Suction device 7 Drying device 8 Winding device 21 Disentangler 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 Conveying wire 51 Water jet head 52 Suction device 55 Conveying wire SW (SW-1, SW-2, SW-3, SW-4) Spunbond nonwoven fabric MP (MP- 1, MP-2, MP-3, MP-4) Fusing point PF Pulp fiber PFW Pulp fiber web PWeb Preliminary laminate (laminate web)
WP Composite non-woven wiper TD Transport direction MD Flow direction CD Width direction LL Vertical line TL Horizontal line FD 1st distance SD 2nd distance TD 3rd distance

Claims (11)

A composite type non-woven wiper in which a pulp fiber web is laminated and integrated on a spunbonded non-woven fabric,
The spunbonded non-woven fabric is formed to include a plurality of fusion points connecting spun resin fibers,
On each of a plurality of longitudinal lines that are parallel to the flow direction of the spunbonded nonwoven fabric and on a plurality of transverse lines that are perpendicular to the flow direction, straight lines are formed at the same intervals. Multiple fusion points are placed,
The intervals on the vertical line and the horizontal line are set to have the same length as each other,
A first distance, which is the distance between the centroids of the fusion points that are adjacent to each other on the vertical line and the horizontal line, and a distance between the centroids of the fusion points that are adjacent to each other in the diagonal direction. And the fusion point is arranged so as to be different from the second distance,
The area of one fusion point is 0.10 to 0.50 mm ² , and the area ratio of the fusion point is set to 7 to 20%,
The composite non-woven wiper, wherein the shorter one of the first distance and the second distance is set to 0.70 to 1.80 mm. The composite non-woven wiper according to claim 1, wherein the first distance is shorter than the second distance. The composite non-woven wiper according to claim 1, wherein the first distance is longer than the second distance. A composite type non-woven wiper in which a pulp fiber web is laminated and integrated on a spunbonded non-woven fabric,
The spunbonded non-woven fabric is formed to include a plurality of fusion points connecting spun resin fibers,
On each of a plurality of longitudinal lines that are parallel to the flow direction of the spunbonded nonwoven fabric and on a plurality of transverse lines that are perpendicular to the flow direction, straight lines are formed at the same intervals. Multiple fusion points are placed,
The intervals on the vertical lines and the horizontal lines are set to have mutually different lengths,
The first distance, which is the distance between the centers of gravity of the fusion points adjacent to each other on the vertical line, and the distance between the centers of gravity of the fusion points adjacent to each other on the horizontal line. Including a certain second distance and a third distance which is a distance between the centers of gravity of the fusion points adjacent to each other in an oblique direction,
The first distance or the second distance, the fusion point is arranged so that the third distance is the same,
The area of one fusion point is 0.10 to 0.50 mm ² , and the area ratio of the fusion point is set to 7 to 20%,
The composite non-woven wiper, wherein the shorter one of the first distance and the second distance is set to 0.70 to 1.80 mm. The composite non-woven wiper according to any one of claims 1 to 4, wherein the shape of the fusion-bonding point is one selected from the group consisting of a circular shape, an elliptical shape, and a polygonal shape. The composite non-woven fabric wiper according to any one of claims 1 to 5, wherein the shortest distance between the fusion points is set to 0.50 to 1.20 mm. The number of fusion Chakuten is 10 to 150 pieces / cm ^2, composite nonwoven fabric wiper according to any one of claims 1 to 6, characterized in that. The composite non-woven fabric wiper according to any one of claims 1 to 7, wherein the fiber diameter of the fibers constituting the spunbonded non-woven fabric is 0.6 to 5.6 decitex. 9. 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 %), any one of claims 1 to 8. A composite non-woven wiper according to claim 1. The composite non-woven wiper according to claim 1, wherein the pulp fiber web has a basis weight of 30 to 70 g/m ² . A method for manufacturing the composite non-woven wiper 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 wiper.

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