JP7121557B2 - Manufacturing method of non-woven wiper - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a nonwoven fabric wiper in which a pulp fiber web and a synthetic fiber web are laminated and integrated.

The non-woven fabric wiper has a fabric-like texture, is equipped with liquid absorption and wiping properties (sometimes referred to as scraping properties), and can be mass-produced at low cost. Therefore, wipers made of non-woven fabric have been widely used.
As a material for non-woven fabrics, synthetic fibers and natural fibers such as pulp are known. However, in consideration of liquid absorbency, it is preferable to use pulp fiber webs. Are known.
It is also known that the wiping property is improved by subjecting a nonwoven fabric to an embossing treatment and processing it into a nonwoven fabric having uneven portions, as disclosed in Patent Document 1, for example. Therefore, a composite nonwoven fabric wiper made of a pulp fiber web and a synthetic fiber web having such uneven portions can be provided as a product with excellent strength and improved wiping performance.

JP-A-60-183139

In Patent Literature 1, a pair of embossing rolls 5 and 5' are used in the embossing process, and a predetermined uneven pattern (embossed pattern) is formed on the nonwoven fabric by thermocompression bonding. Here, when the non-woven fabric is sandwiched between a pair of embossing rolls and embossed, there is an embossing called "matched steel" and an embossing called "tip to tip". Are known. The former matched steel is a technique in which the uneven portions of the upper and lower embossing rolls are made to correspond to each other so that the uneven portions are meshed with each other, and the uneven portion pattern is imparted by passing the nonwoven fabric between them. The latter chip-to-chip method is a method of imparting an uneven pattern by bringing the convex portions of the upper and lower embossing rolls into contact with each other and passing the nonwoven fabric between them.

However, when embossing is performed by arranging embossing rolls above and below as described above, it is confirmed that the produced nonwoven fabric has a decrease in strength and the occurrence of lint (dust generation) due to deterioration thought to be caused by the embossing treatment. Sometimes. In particular, in the case of a non-woven fabric wiper having a pulp fiber web arranged on the surface in consideration of the liquid absorption performance, etc., the reduction in strength and the generation of lint due to falling off of the fibers pose a greater problem.

Accordingly, an object of the present invention is to provide a non-woven fabric wiper in which a pulp fiber web and a synthetic fiber web serving as a backing surface are laminated and integrated, and even if an uneven pattern is formed by embossing, the strength is reduced and lint is generated. To provide a method for manufacturing a nonwoven fabric wiper capable of suppressing the

For the above object, a pulp fiber web serving as a wiping surface and a synthetic fiber web serving as a backing surface of the wiping surface are laminated and integrated by hydroentangling, and an uneven pattern is formed by embossing. In the method for manufacturing a nonwoven fabric wiper, the uneven pattern is formed by subjecting the pulp fiber web side to single-sided embossing after the integration and drying , with reference to the case where the single-sided embossing is not performed. Wet Taber value (using a Taber tester specified in JIS L 1096, the nonwoven fabric wiper as a sample wetted with water is attached to a rotating horizontal disc, and the nonwoven fabric wiper is molded with an abrasive grain bond. When a pair of friction wheels (H-18) are applied under a specified load (4.9 N), the number of rotations of the disk until the hole in the non-woven fabric wiper becomes 13 mm due to wear) Decrease rate) is 0 to 5% .

In the one- sided embossing process, it is preferable that the concave/convex pattern is a dot pattern formed by interspersing dot elements, and the pressing area ratio of the dot elements is 5 to 17%.
In the single- sided embossing process, the dot pattern can be formed based on at least one dot element selected from the group of circular, elliptical, polygonal, star-shaped, fan-shaped and cross-shaped.

In the single- sided embossing process, the uneven portion pattern is a ring-shaped pattern formed by interspersing hollow ring-shaped elements, and the line width of the lines defining the hollow ring-shaped elements is set to 0.5 mm. 2.0 mm , and the indentation area ratio of the wire is preferably 10 to 33%.
Further, the single- sided embossing treatment may arrange the ring-shaped patterns so as to be spaced apart from each other.
Further, the single- sided embossing treatment may arrange the ring-shaped patterns in contact with each other.
In the one- sided embossing process, at least one outer shape of the annular pattern can be selected from the group of circular, elliptical, polygonal, star-shaped, fan-shaped and cross-shaped.

In addition, the single- sided embossing process is performed as a composite pattern including a dot pattern formed by interspersing dot elements in the uneven portion pattern and a ring-shaped pattern formed by interspersing hollow ring-shaped elements. can also be formed.

Further , an embossing apparatus including an embossing roll having a peripheral surface with the concave-convex pattern and a plain roll having a flat peripheral surface, which are in pressure contact with each other, is used to emboss the pulp fiber web side. The single- sided embossing treatment can be applied by contacting with a roll.

According to the present invention, the pulp fiber web side is embossed on one side, so that it is possible to provide a nonwoven fabric wiper with improved wiping properties, which can suppress strength reduction and lint generation. Further, in the single-sided embossing process, by setting the uneven pattern to be formed and the embossed area ratio at that time within a predetermined range, it is possible to provide a nonwoven fabric wiper capable of reliably suppressing a reduction in strength and generation of lint.

BRIEF DESCRIPTION OF THE DRAWINGS It is the figure shown in order to make the present invention easy to understand, FIG.1(a) is the figure shown about the nonwoven fabric wiper of this invention, FIG.1(b) and FIG.1(c) are the figures shown for comparison. is. FIG. 10 is a diagram showing a case where a concave-convex pattern formed on a pulp fiber web is formed by a dot pattern; FIG. 10 is a diagram showing a case where a concavo-convex pattern formed on a pulp fiber web is formed by a ring-shaped pattern. FIG. 10 is a diagram showing a case where the concave-convex pattern is formed in a composite pattern of a dot pattern and a ring-shaped pattern; It is a figure shown about the nonwoven fabric wiper manufacturing apparatus.

Hereinafter, a nonwoven fabric wiper according to one embodiment of the present invention will be described with reference to the drawings.
1A and 1B are diagrams for facilitating understanding of the present invention, and FIG. 1A is a diagram showing the characteristic configuration of the nonwoven fabric wiper of the present invention and a set of rolls used for embossing. On the other hand, FIGS. 1(b) and 1(c) are diagrams showing the case of embossing by matched steel and chip-to-chip as pointed out above for comparison.

The non-woven fabric wiper EWP according to the present invention shown on the right side of FIG. 1(a) has a basic structure in which a synthetic fiber web SW is integrally laminated on the back side of a pulp fiber web PFW which serves as a wiping surface. have. The synthetic fiber web SW serves as a backing surface that reinforces the pulp fiber web PFW and retains the outer shape of the wiper.

Here, the non-woven fabric wiper EWP is embossed on one side, and the upper pulp fiber web PFW is formed with a predetermined concave-convex pattern PA. More specifically, the processing is performed using the embossing device EA shown on the left side of FIG. 1(a).
The embossing device EA comprises an upper embossing roll a1 and a lower plain roll a2 that come into contact with the pulp fiber web PFW. The outer peripheral surface of the embossing roll a1 is engraved with a concave-convex pattern to be formed on the pulp fiber web PFW. On the other hand, the plain roll a2 has a flat outer peripheral surface.

The embossing roll a1 and the plain roll a2 are pressed against each other with a linear pressure of 20 to 70 kg/cm, for example. More preferably, at least one of the embossing roll a1 and the plain roll a2 is provided with a heating means, and the embossing roll a1 and the plain roll a2 are heat-pressed to form an uneven pattern on the pulp fiber web PFW. Although the heating means is not particularly limited, it can be a heater arranged in each of the rolls a1 and a2.
The surface of the synthetic fiber web SW located on the lower side (the back side of the nonwoven fabric wiper EWP) is flat because it contacts the plain roll a2.
By appropriately adjusting the linear pressure and heating temperature in consideration of the web transport speed and the basis weight of the web in the embossing device EA, the uneven pattern is reliably formed on the pulp fiber web PFW.

On the other hand, in the matched steel embossing device shown in FIG. 1(b) and the chip-to-chip embossing device shown in FIG. . At that time, it is also heated, so in a non-woven fabric wiper having a pulp fiber web on its surface, it is expected that some of the fibers will be degraded, causing the above-described problems of strength reduction and lint generation.
In the nonwoven fabric wiper EWP according to the present invention, as shown in FIG. 1(a), single-sided embossing treatment is adopted, so damage to the nonwoven fabric can be reduced, and strength reduction and lint generation can be suppressed.

Then, the inventors of the present invention have found that the non-woven fabric wiper EWP has a preferable configuration, regarding the uneven pattern (embossing pattern) when embossing on one side, the relationship between the pattern to be adopted as a basis and the area ratio of the pressed portion formed by the pattern. was examined in detail, and the relationship between the adopted pattern and the indentation area ratio at that time was confirmed, and the concave-convex pattern that can more reliably suppress the decrease in strength and the generation of lint while maintaining high wiping performance was specified.
In the following, the conditions for the preferable concave/convex pattern will be described in detail.

FIG. 2 is a diagram showing a case where the pattern of irregularities formed on the pulp fiber web is formed by a dot pattern, and FIG. 3 shows a case where the pattern of irregularities formed on the pulp fiber web is formed by a ring pattern. FIG. 4 is a diagram showing a case where the concave-convex pattern formed on the pulp fiber web is formed in a composite pattern of the dot pattern and the ring-shaped pattern.
In FIG. 2, (a) illustrates the case where the dot elements DT are arranged in a scattered manner in the form of squares (polygons), and (b) illustrates the case in which the dot elements DT are arranged in a dotted manner in the form of circles. At least one shape that can be used as the dot element DT can be selected from the group consisting of, for example, circular, elliptical, polygonal, star-shaped, fan-shaped, and cross-shaped. The cross shape is a figure formed by straight lines or curved lines crossing each other. 2(a) and 2(b) show the case where the dot element is composed of one type of dot, but the dot element is composed of two or more types (for example, square dot and circular dot). A pattern (concavo-convex pattern) may be formed.

As exemplified in FIG. 2, when a concave-convex pattern is formed as a dot pattern, in the embossing process, the part made into the dot element DT becomes the indentation part (the area depressed by the embossing process). is added. Therefore, by keeping the ratio of the pressing area by the dot elements DT low, it is possible to more reliably suppress the above-described problems of reduction in strength and occurrence of lint. The indentation area ratio in the dot pattern (indentation area by dot elements/area of pulp fiber web) is preferably 5 to 17%. More preferably 13 to 15%. In the case of forming the concave-convex pattern with a dot pattern, if such conditions are set, it is possible to reliably suppress the decrease in strength and generation of lint described above, and to obtain a non-woven fabric wiper with excellent wiping properties.

Next, FIG. 3 shows a case where a ring-shaped pattern is adopted as the concave-convex pattern. In FIG. 3, (a) shows ring-shaped hollow ring-shaped elements ER that are spaced apart from each other, and (b) shows hollow ring-shaped elements ER that are hexagonal (polygonal) and are in contact with each other. A case of interspersed arrangement is illustrated. Here, the hollow ring-shaped element ER is an element that is the basis of the pattern corresponding to the dot element, and has a shape that leaves a hollow portion inside the closed line. . Explaining with reference to FIG. 3(a), the ring-shaped closed line is the embossed portion, which becomes the indentation corresponding to the dot element described above. The inner side of the web is not embossed, so it becomes a blanked state (untreated pulp fiber web). In this specification, such a figure in which a hollow portion exists inside a closed line is called a hollow ring shape, and this is a basic element (hollow ring shape element). The pattern is called an annular pattern.

At least one shape can be selected from the group consisting of a circular shape, an elliptical shape, a polygonal shape, a star shape, a sector shape, and the aforementioned cross shape. 3A and 3B show the case where one type of hollow ring-shaped element is configured, but two or more types (for example, a square hollow ring shape and a circular hollow ring shape (ring shape) ) constitutes a hollow ring-shaped element, thereby forming a ring-shaped pattern (concavo-convex pattern).
Further, when designing the concave-convex pattern using a ring-shaped pattern, a pattern in which ring-shaped elements (ring-shaped elements) are arranged apart from each other as shown in FIG. A pattern in which ring-shaped elements (hexagons) are arranged in contact with each other may also be used.

In the ring-shaped pattern, as described above, the portion of the line defining the hollow ring-shaped element ER is the indentation portion. The line width is preferably 0.5 mm to 1.5 mm. If the line width is 0.5 mm or less, the embossing effect cannot be expected. On the other hand, if it exceeds 1.5 mm, there is a concern that the strength of the peripheral portion will be reduced and lint will be generated.
In the case of the ring-shaped pattern illustrated in FIG. 3, the indentation area ratio (indentation area by line portion/area of pulp fiber web) is preferably 10 to 33%. More preferably 18 to 25%. When the uneven pattern is formed by the ring-shaped pattern, setting such conditions suppresses the decrease in strength and generation of lint described above, making it possible to obtain a nonwoven fabric wiper with excellent wiping properties.
It should be noted that the pressing area ratio can be made relatively higher when the concave-convex pattern is formed using a ring-shaped pattern, as compared with the case where the dot pattern described above is adopted. The ring-shaped pattern is expected to have a shape effect that causes less damage when embossed.

FIG. 4 shows a case in which a concavo-convex pattern is formed by combining the dot pattern and the ring-shaped pattern. In the example shown here, the hollow ring-shaped element ER is a quadrilateral, and a ring-shaped pattern is formed by contacting and arranging the quadrilaterals, and the corner portions (contact points) of the quadrangle are dots DT.
In this way, the concave/convex pattern may be designed using a composite pattern of the dot pattern and the ring-shaped pattern.
In the case of a composite pattern as shown in FIG. 4, it is preferable that the above-described indentation area ratio (indentation area by dot and line portions/area of pulp fiber web) be 5 to 17%.

Hereinafter, the manufacturing process of the nonwoven fabric wiper of the present invention described above will be further described. Here, in manufacturing the embossed nonwoven fabric wiper EWP, first, the main configuration of a manufacturing apparatus for manufacturing a flat nonwoven fabric wiper WP (a wiper serving as the base material of the nonwoven fabric wiper EWP) will be described, and then the aforementioned embossing device will be described. Application of EA (FIG. 1(a)) will be described.

The nonwoven fabric wiper manufacturing apparatus 1 shown in FIG. 5 has an airlaid device 2, a spunbond web supply device 3 for supplying a spunbond web as a synthetic fiber web, and a suction device 4 on the upstream side. The suction device 4 is arranged to face the lower side of the air raid device 2 .
Downstream from these devices 2, 3, and 4 in the web transport direction TD are, in order from the upstream side, a hydroentangling device 5 that injects water jets for hydroentangling treatment, a suction device 6, and a drying device 7. are placed. Downstream of the drying device 7, there is further provided a winding device 8 for winding the continuously manufactured nonwoven fabric wiper WP.

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

An air raid hopper 23 is arranged downstream of the duct 22 . The air-laid hopper 23 is designed so that the disentangled pulp fibers descend while being dispersed, and are gradually piled up at a stacking position 24 set on the lower surface to form a pulp fiber web PFW.
A suction device 4 is arranged below the stacking position 24 so as to face it. More specifically, the suction device 4 has a suction portion 42 on the upper surface of the device main body 41, and the suction portion 42 moves toward the stacking position 24 so as to apply a suction force (negative pressure) to the pulp fiber web PFW. have been set.
Note that FIG. 5 illustrates a case where the pulp fiber web PFW is formed by arranging the air laid hopper 23 and the suction device main body 41 one by one in one stage. However, the arrangement is not limited to this, and the arrangement may be changed so that the air laid hopper 23 and the suction device main body 41 are arranged in two or more stages according to the basis weight (basis weight) and production speed of the pulp fiber web PFW.

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

Below the air laid device 2 and upstream of the suction device 4, a spunbond web supply device 3 is arranged. A spunbond web SW that has been prepared in advance is set in the form of a roll in the spunbond web supply device 3 . A spunbonded web SW is pulled out from the spunbonded web supply device 3 and transported to the stacking position 24 on the transport wire 43 described above. As the spunbond web SW, it is preferable to use a synthetic resin continuous filament web formed by a spunbond method.

The aforementioned pulp fiber web PFW is placed on the spunbond web SW positioned at the stacking position 24 . At the stacking position 24, the suction force of the suction portion 42 of the suction device 4 passes through the conveying wire 43 and acts on the spunbond web SW and the pulp fiber web PFW thereon. Therefore, the preliminary laminate PWeb in which the spunbond web SW and the pulp fiber web PFW are laminated is conveyed downstream.

The above-described preliminary laminate PWeb is suction-compressed by the suction force of the suction device 4, so that the laminated state is maintained. At this time, the fibers of the upper pulp fiber web PFW are in a densified state. However, if the preliminary laminate PWeb is transported into the hydroentangling device 5 on the downstream side as it is, there is a risk that some of the pulp fibers PF will be blown up by water jets (high-pressure water streams).
Therefore, in the present manufacturing apparatus 1, nipping rollers 28 for stabilizing the placement state of the pulp fiber web PFW on the spunbond web SW while nipping the preliminary laminate PWeb from above and below, and upstream of the hydroentangling device 5 A pre-wet device 30 is provided on the side to apply water to prevent scattering of fibers. The pre-wetting device 30 preferably applies a suction force from a spray nozzle 31 that sprays water mist from above the preliminary laminated body PWeb and from the lower side of the preliminary laminated body PWeb (that is, the lower surface of the pulp fiber web PFW). and a suction device 32 .
Although FIG. 5 illustrates the case where the prewetting device 30 is provided as a new device in front of the hydroentangling device 5 as described above, the present invention is not limited to this. Among a plurality of sets each including a water jet head 51 and a suction device 52 (to be described later) included in the hydroentangling device 5 , the design may be changed such that the head set is used as the prewetting device 30 . In this case, adjustment should be made so that low-pressure water mist is sprayed from the leading water jet head 51 .
In the case of the hydroentangling device 5 in which the number of sets of the water jet head 51 and the suction device 52 sufficient to perform the hydroentanglement treatment is ensured, the top water jet head 51 and the suction device 52 are preliminarily set as described above. Utilizing it as a wet device is effective in suppressing the equipment cost.

Then, in the hydroentangling device 5, a high-pressure water jet is blown onto the preliminarily laminated body PWeb that has been treated by the nipping roller 28 and the prewetting device 30 serving as a pretreatment unit, thereby promoting the entangling of the pulp fibers. This promotes integration of the upper pulp fiber web PFW layer and the lower spunbond web SW layer.
The hydroentangling device 5 illustrated in FIG. 5 has water jet heads 51 arranged in multiple stages (four stages are illustrated in FIG. 5) along the transport direction TD.
Although FIG. 5 does not show the nozzles provided in the water jet head 51 extending in the direction perpendicular to the conveying direction TD (the width direction WD of the web), a plurality of nozzles are arranged in the width direction. A water jet nozzle is placed at an appropriate position.

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

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

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

Therefore, as shown in FIG. 5, on the downstream side of the hydroentangling device 5, there is a suction device 6 and a drying device for removing moisture remaining in the web by suction and drying the web to complete the production of the nonwoven fabric wiper WP. A device 7 is provided. By performing dehydration and drying by the suction device 6 and the drying device 7 in the latter stage of the production of the nonwoven fabric wiper WP, the nonwoven fabric can be efficiently produced, and the nonwoven fabric after hydroentanglement can be produced without applying a large external pressure. Since a dry nonwoven fabric can be produced, a bulky product can be finished.
The suction device 6 dewaters the hydroentangled nonwoven fabric by, for example, a vacuum system. The drying device 7 preferably employs a non-compression type dryer, preferably an air-through dryer. In FIG. 5, a rotatable dryer body 71 of the air-through dryer is a cylindrical body, and has a large number of through-holes on its peripheral surface. It is preferable to adopt a configuration in which the air is sucked in toward the side.
The composite nonwoven fabric wiper WP continuously manufactured in this way is wound around the roller 81 of the winding device 8 to complete a series of processes.

The manufacturing apparatus for manufacturing the nonwoven wiper WP, which is the base material of the embossed nonwoven wiper EWP according to the present invention, has been described above.
Here, if the embossing device EA shown on the left side of FIG. 1(a) is applied to the nonwoven fabric wiper WP, the nonwoven fabric wiper EWP according to the present invention can be manufactured. When adding on-line to the nonwoven fabric wiper manufacturing apparatus of FIG. Although it is preferable to provide the embossing device EA integrally with the non-woven fabric wiper manufacturing apparatus in this way, the non-woven fabric wiper WP may be temporarily wound around the roller 81 and embossed off-line by a separately provided embossing device EA.

(Example)
A nonwoven fabric wiper EWP according to the present invention shown on the right side of FIG. 1(a), that is, a pulp fiber web PFW and a synthetic fiber web SW are integrally laminated, and an uneven pattern PA is formed on the pulp fiber web PFW side by single-sided embossing. A non-woven fabric wiper was produced as described above, and evaluation was made on a dot pattern formed of dot elements and a ring-shaped pattern formed of hollow ring-shaped elements.
In this evaluation, the strength (decrease rate), wet Taber value (decrease rate), and wiping performance of the nonwoven fabric wiper EWP were confirmed by sequentially changing the above-mentioned indentation area ratio.

The measuring method is as follows.
1) Strength: Tensile strength was measured according to JIS P8113, and the rate of decrease in value was determined based on the case without embossing.
2) Wet Taber value: Using a Taber tester specified in JIS L 1096, a pair of friction wheels formed with a bonded abrasive by attaching a sample wetted with water to a rotating horizontal disc. (H-18) was applied under a specified load (4.9 N) to examine wear resistance. This confirmed the degree of shedding of the entangled fibers during use of the wiper. Judgment was made by the number of revolutions of the disk until the hole in the sheet became 13 mm due to wear. The percent decrease in value was determined based on the case without embossing. The rate of decrease was evaluated as ⊚ when 0 to 5% or less, ∘ when 5% to 15% or less, and x when greater than 15%.
3) Wipeability: A sensory evaluation was conducted by 10 monitor testers.
When all the evaluations were 0 or higher, the overall evaluation was 0, and it was judged that it was suitable as a non-woven fabric wiper product, and the others were evaluated as unacceptable.
The following (Table 1) collectively shows the above results.

In Table 1 above, when the dot pattern was adopted as the concave-convex pattern, the comprehensive evaluation was ⊚ when the indentation area ratio was 5.2%. From this, it can be easily guessed that at least the overall evaluation is ◯ when the indentation area ratio is 5%. Also, when the indentation area ratio is 14.4%, it is ⊚, and when it is 20.2%, it is x. ing.
Further, when a ring-shaped pattern with a hollow ring-shaped pattern was employed as the concave-convex pattern, the comprehensive evaluation was ⊚ when the indentation area ratio was 10%. Also, the overall evaluation is ◯ when the indentation area ratio is 32.5%, and it can be easily assumed that the overall evaluation is ◯ when the approximate value is 33%.

As is clear from the above, according to the present invention, the pulp fiber web and the synthetic fiber web are laminated and integrated, and the pulp fiber web side is embossed on one side. It is possible to provide a non-woven fabric wiper with improved removability.
In particular, the pattern shape (dot, hollow ring shape) adopted for the uneven pattern and the embossing process that satisfies the predetermined conditions for the indentation area ratio is a fabric that can more reliably suppress the decrease in strength and the generation of lint. Can be provided as a cloth wiper.
According to the manufacturing method of the present invention, a nonwoven fabric wiper can be reliably manufactured.

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

1 nonwoven fabric wiper manufacturing device 2 airlaid device 3 spunbond web (synthetic fiber web) supply device 4 suction device 5 hydroentangling device 6 suction device 7 drying device 8 winding device EA embossing device PF pulp fiber PFW pulp fiber web PWeb preliminary lamination Body SW Synthetic fiber web (spunbond web)
WP nonwoven wiper EWP nonwoven wiper according to the invention (embossed nonwoven wiper)
PA Concavo-convex pattern DT Dot element ER Hollow ring-shaped element a1 Embossed roll a2 Plain roll

Claims (9)

A nonwoven fabric wiper in which a pulp fiber web serving as a wiping surface and a synthetic fiber web serving as a lining surface of the wiping surface are laminated and integrated by hydroentangling, and an uneven pattern is formed by embossing. A method of manufacturing a
After the integration and after drying, the uneven part pattern is formed by subjecting the pulp fiber web side to a single-sided embossing treatment , so that the wet Taber value (JIS L 1096) is based on the case where the single-sided embossing treatment is not performed. Using a Taber testing machine, the nonwoven fabric wiper as a sample wetted with water was attached to a rotating horizontal disc, and a pair of friction rings (H-18) formed of a bonded abrasive was attached to the nonwoven fabric wiper. When applied under a specified load (4.9 N), the reduction rate of the number of revolutions of the disc until the hole in the nonwoven fabric wiper becomes 13 mm due to wear) is 0 to 5%. A method for manufacturing a nonwoven wiper. 2. The method according to claim 1 , wherein the single-sided embossing process is such that the uneven pattern is a dot pattern formed by interspersing dot elements, and the pressing area ratio of the dot elements is 5 to 17% . method for manufacturing a nonwoven wiper. The single- sided embossing process is characterized in that the dot pattern is formed based on the dot elements selected from the group of circular, elliptical, polygonal, star-shaped, fan-shaped and cross-shaped. A method for manufacturing a nonwoven wiper according to claim 2. In the single- sided embossing process, the uneven portion pattern is a ring-shaped pattern formed by interspersing hollow ring-shaped elements, and the line width of the line defining the hollow ring-shaped elements is 0.5 mm to 2.0 mm. 0 mm , and the indentation area ratio of the wire is 10 to 33%. 5. The method of manufacturing a nonwoven fabric wiper according to claim 4, wherein the one-side embossing process causes the annular patterns to be spaced apart from each other. 5. The method of manufacturing a non-woven wiper according to claim 4 , wherein said single-sided embossing process places said ring-shaped patterns in contact with each other. 7. The one-side embossing process is characterized in that at least one outer shape of the annular pattern is selected from the group of circular, elliptical, polygonal, star-shaped, fan-shaped and cross-shaped. A method for producing a nonwoven fabric wiper according to any one of 1. In the single- sided embossing process, the uneven pattern is formed as a composite pattern including a dot pattern formed by interspersing dot elements and a ring-shaped pattern formed by interspersing hollow ring-shaped elements. The manufacturing method of the nonwoven fabric wiper according to claim 1, characterized by: An embossing apparatus including an embossing roll having the uneven pattern engraved on the peripheral surface and a plain roll having a flat peripheral surface and being in pressure contact is used, and the pulp fiber web side is pressed against the embossing roll. 2. The method for manufacturing a non-woven fabric wiper according to claim 1, wherein the single-sided embossing treatment is performed by contacting the non-woven fabric wiper.

Images