TWI567259B - Manufacture of nonwovens and nonwovens - Google Patents

Description

Non-woven fabric and non-woven fabric manufacturing method

The present invention relates to nonwoven fabrics, and more particularly to nonwoven fabrics suitable for use in wipes. Further, the present invention relates to a method of manufacturing the above nonwoven fabric.

A method for producing a bulky paper which is well known in the prior art, characterized in that a fiber sheet having a water content of 50 to 85% by weight is transferred to an open mesh net that rotates along a suction portion, and is retained in the fiber sheet. The fiber sheet is attracted to the state of the mesh on the perforated mesh, and at the same time as or before the attraction, water flakes having a heat of 5 kcal/kg or more are sprayed on the fiber sheet to form and open the mesh of the fiber sheet. The pattern corresponding to the web is dried to thereby obtain a patterned bulky paper (for example, Patent Document 1). The bulky paper produced by this manufacturing method is used as a wiping paper such as a conditioning paper, a paper towel, or a facial tissue. By the method for producing the bulky paper, it is possible to produce a bulky paper having a large thickness, high absorbability, good flexibility, and moderately firmness.

[Previous Technical Literature] [Patent Literature]

Patent Document 1 Japanese Patent Publication No. 2000-34690

When the non-woven fabric is used as a wiping paper, the non-woven fabric preferably has a large thickness, high absorbability, good flexibility, and moderately firmness. When the non-woven fabric is made by wet, the speed of the manufacturing line can be increased, and the manufacturing efficiency can be improved. However, when the non-woven fabric is made by wet, there is a problem that the volume of the non-woven fabric is not improved. In the method for producing a bulky paper described in Patent Document 1, the volume of the nonwoven fabric can be increased. However, in order to further improve the wiping property, the touch feeling, and the like of the non-woven fabric, it is desired to have a more bulky non-woven fabric.

It is an object of the present invention to provide a bulk nonwoven fabric produced in a wet manner and a method of producing the nonwoven fabric.

In order to solve the above problems, the present invention adopts the following configuration.

In other words, the method for producing a nonwoven fabric of the present invention comprises the steps of: supplying a water-containing papermaking material to a unidirectional moving belt to form a paper layer on the belt; and spraying a high-pressure water stream on the paper layer to make it on the surface Forming a step of extending in the machine direction and arranging the recesses at intervals in the width direction; a paper layer that has been sprayed through a high-pressure water stream and adhered to the surface of a rotating cylindrical dryer, thereby drying the paper layer sprayed with the high-pressure water stream to a moisture content of 10 to 45%; and adhering to the cylindrical dryer a paper layer on the surface, which is separated from the surface by a doctor blade, thereby forming a wrinkle in the paper layer; and spraying high-pressure steam from the surface of one of the wrinkled paper layers from the vapor nozzle, thereby leaving The wrinkles on the other side of the lower paper layer break the wrinkles on one side of the paper layer, and the groove portion having a width larger than the width of the concave portion and extending in the machine direction is formed on one side of the paper layer. A step of.

Further, the nonwoven fabric of the present invention has a longitudinal direction, a lateral direction intersecting the longitudinal direction, a thickness direction perpendicular to the longitudinal direction and the lateral direction, a surface perpendicular to the thickness direction, and a surface opposite to the one surface. The other side of the thickness direction has a groove extending in the longitudinal direction and arranged in the lateral direction on one surface, and a concave portion extending in the longitudinal direction and spaced apart in the lateral direction on the other surface. On the other side, there is a wrinkle that extends in the lateral direction and is arranged in the longitudinal direction, and does not have wrinkles on one side.

According to the present invention, a bulky nonwoven fabric which can be produced wet can be produced.

1‧‧‧Nonwoven manufacturing equipment

11‧‧‧Material supply head

12‧‧‧High pressure water jet nozzle

13‧‧‧Attraction roller

14‧‧‧Vapor nozzle

15‧‧‧Attraction box

16‧‧‧Paper layer forming conveyor

17‧‧‧Attracting pickers

18,19‧‧‧Paper handling conveyor belt

20,22‧‧‧dryer

21‧‧‧Winding machine

23‧‧‧paper layer

26‧‧‧Scraper

31‧‧‧High pressure water flow

32‧‧‧ recess

41‧‧‧Paper layer forming belt

51‧‧‧High pressure water vapor

52‧‧‧ wrinkles

53‧‧‧Ditch

57‧‧‧ hair raising

Fig. 1 is a view for explaining a nonwoven fabric manufacturing apparatus using a manufacturing method of a nonwoven fabric according to an embodiment of the present invention.

Fig. 2 is a view showing an example of a high pressure water jet nozzle.

Fig. 3 is a view showing an example of a nozzle hole of a high pressure water flow nozzle.

Fig. 4 is a view for explaining the principle of interlacing fibers of a paper layer with each other by a high-pressure water flow.

Fig. 5 is a schematic cross-sectional view showing the width direction of the paper layer to which the high-pressure water jet is jetted.

Figure 6 is a photomicrograph showing the surface of a wrinkled paper layer.

Fig. 7 is a view showing an example of a high pressure water vapor nozzle.

Fig. 8 is a view showing an example of a nozzle hole of a high-pressure steam nozzle.

Fig. 9 is a view for explaining the principle in which the fibers of the paper layer are unwound by the high-pressure water vapor, and the volume of the paper layer becomes large.

Fig. 10 is a schematic perspective view showing a part of a paper layer in which high-pressure water vapor is sprayed.

Figure 11 is a photomicrograph showing the surface of a nonwoven fabric in an embodiment of the present invention.

Hereinafter, a method of manufacturing a nonwoven fabric according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a view for explaining a nonwoven fabric manufacturing apparatus 1 using a manufacturing method of a nonwoven fabric according to an embodiment of the present invention.

The papermaking raw material of the water content such as the fiber suspension is supplied to The raw material supply head 11 is provided. The papermaking raw material supplied to the raw material supply head 11 is supplied from the raw material supply head 11 to the paper layer forming belt of the paper layer forming conveyor 16, and is deposited on the paper layer forming belt. The paper layer forming belt is preferably a support having a gas permeability through which steam can pass. For example, a wire mesh, a felt, or the like can be used as a paper layer forming tape.

The fiber used for the papermaking raw material supplied to the raw material supply head 11 is preferably a short fiber having a fiber length of 20 mm or less. Such short fibers may, for example, be wood pulp of chemical pulp of conifer or hardwood, semi-chemical pulp and mechanical pulp, mercerized pulp chemically treated with such wood pulp, and non-wood such as crosslinked pulp, hemp or cotton. Examples are fiber-like fibers such as regenerated fibers such as rayon fibers, and synthetic fibers such as polyethylene fibers, polypropylene fibers, polyester fibers, and polyamide fibers. The fiber used for the papermaking raw material is preferably a cellulose-based fiber such as wood pulp, non-wood pulp, or rayon fiber.

The papermaking material deposited on the paper layer forming belt is appropriately dehydrated by the suction box 15 to form the paper layer 23. The paper layer 23 passes between two high-pressure water flow nozzles 12 disposed on the paper layer forming belt, and two suction boxes 15 disposed at positions facing the high-pressure water flow nozzle 12 with the paper layer forming belt interposed therebetween. The high pressure water jet nozzle 12 sprays a high pressure water stream on the paper layer 23. The suction box 15 draws and collects water sprayed from the high pressure water flow nozzle 12. A high-pressure water stream is ejected from the high-pressure water jet nozzle 12 to the paper layer 23, and a concave portion is formed on the surface of the paper layer 23.

One of the high pressure water jet nozzles 12 is exemplified in Fig. 2. The high pressure water jet nozzles 12 will be arranged in the width direction (CD) of the paper layer 23 The high pressure water stream 31 is ejected toward the paper layer 23. As a result, a plurality of concave portions 32 which are arranged in the width direction (CD) of the paper layer 23 and which extend in the machine direction (MD) are formed on the surface of the paper layer 23.

An example of the nozzle hole of the high pressure water jet nozzle 12 is shown in Fig. 3. The nozzle holes 121 of the high-pressure water jet nozzle 12 are arranged in a line in the width direction (CD) of the paper layer, for example. The nozzle hole 121 preferably has a diameter of 90 to 150 μm. When the diameter of the nozzle hole 121 is less than 90 μm, the nozzle may be easily blocked. When the diameter of the nozzle hole 121 is larger than 150 μm, the processing efficiency may be deteriorated.

The pitch of the nozzle holes 121 (the distance between the centers of the adjacent holes in the width direction (CD)) is preferably 0.5 to 1.0 mm. When the pitch of the nozzle holes 121 is less than 0.5 mm, the withstand voltage of the nozzle is lowered and the damage is caused. Further, when the hole pitch of the nozzle holes 121 is larger than 1.0 mm, there is a case where the fiber entanglement is insufficient.

When the paper layer 23 is subjected to a high-pressure water flow, the concave portion 32 is formed in the paper layer 23 as shown in Fig. 2 . Further, when the paper layer 23 is subjected to a high-pressure water flow, the fibers of the paper layer 23 entangle each other, and the strength of the paper layer 23 becomes high. When the paper layer 23 is subjected to a high-pressure water flow, the principle of the fibers of the paper layer 23 intermingling with each other will be described with reference to Fig. 4 . However, this principle does not limit the invention.

As shown in Fig. 4, when the high pressure water stream 31 is ejected from the high pressure water jet nozzle 12 to the paper layer 23, the high pressure water stream 31 passes through the paper layer 23 and the paper layer forming belt 41. Thereby the fibers of the paper layer 23 are drawn towards the high pressure water stream 31 through the portion 42 of the paper layer forming belt 41. As a result, the fibers of the paper layer 23 are gathered toward the high pressure water stream 31 through the portion 42 of the paper layer forming belt 41, whereby The fibers are interlaced with each other.

The strength of the paper layer 23 is made high by the fibers of the paper layer 23 intertwined with each other. Thereby, in the subsequent step, even if high-pressure water vapor is sprayed on the paper layer 23, the paper layer 23 is perforated, the paper layer 23 is broken, and the state of being scattered is reduced. Further, the papermaking raw material can increase the wet strength of the paper layer 23 without adding a paper strength enhancer.

A schematic view of a cross section in the width direction when the paper layer 23 passes between the two high-pressure water jet nozzles 12 and the position between the two suction boxes 15 (the position of the symbol 24 in the first drawing) is shown in Fig. 5. A recess 32 is formed on the surface of the paper layer 23 by a high-pressure water flow. A pattern (not shown) corresponding to the pattern of the paper layer forming belt is formed on the surface opposite to the surface on which the high pressure water jet is sprayed.

Thereafter, as shown in Fig. 1, the paper layer 23 is transferred to the paper layer conveyance conveyor 18 by the suction pickup 17. Further, the paper layer 23 is transferred to the paper layer conveyance conveyor 19 and then transferred to the dryer 20.

The dryer 20 dries the paper layer 23 which is sprayed with a high-pressure water stream. The dryer 20 is, for example, a Yankee dryer. The dryer 20 includes a rotating cylindrical dryer, and the surface of the cylindrical dryer is heated to about 160 ° C by steam or the like. The dryer 20 adheres the paper layer 23 to the surface of the rotating cylindrical dryer to dry the paper layer 23.

The dryer 20 dries the paper layer 23 to a moisture content of preferably 10 to 45%, more preferably 20 to 40%. Here, the water content means the amount of water contained in the paper layer when the dry mass of the paper layer 23 is set to 100%.

When the water content of the paper layer 23 is less than 10%, there is a paper layer 23 The hydrogen bond strength between the fibers is increased, and the energy required to unwind the fibers of the paper layer 23 by the high-pressure steam described later becomes extremely high. Further, when the water content of the paper layer 23 is less than 10%, the adhesion of the paper layer 23 to the surface of the cylindrical dryer is weak, and the wrinkles cannot be formed on the paper layer 23 by the step of forming the wrinkles described later. .

On the other hand, when the water content of the paper layer 23 is more than 45%, the energy required to dry the paper layer 23 to a predetermined water content or less by the high-pressure steam described later may be extremely high. Further, when the water content of the paper layer 23 is more than 45%, the hydrogen bond strength between the fibers in the paper layer becomes weak. Therefore, there is a possibility that the wrinkles formed on the paper layer 23 by the step of forming the wrinkles described later are deformed by the tension applied to the paper layer 23, disappeared, or the strength of the paper layer 23 is greatly reduced when the wrinkles are formed, and the paper layer 23 is formed. The situation of rupture.

As shown in Fig. 1, the paper layer 23 adhering to the surface of the rotating cylindrical dryer of the dryer 20 is separated from the surface of the cylindrical dryer by the doctor blade 26. At this time, wrinkles which are extended in the width direction (CD) and are arranged in the machine direction (MD) are formed in the paper layer 23. The paper layer 23 adhering to the surface of the cylindrical dryer is separated from the surface of the cylindrical dryer by collision with the end surface of the blade 26 that abuts against the surface of the cylindrical dryer. By this collision, the shape of the cross section of the paper layer 23 bent in the machine direction (MD) is wavy, and wrinkles are formed in the paper layer 23.

The wrinkle ratio of the wrinkles formed on the paper layer 23 is preferably 5 to 50%. When the wrinkle ratio of the wrinkles formed on the paper layer 23 is less than 5%, the volume of the nonwoven fabric may not be improved. When the wrinkle ratio of the wrinkles formed on the paper layer 23 is more than 50%, there is a difficulty in forming a wrinkled paper layer. The case where the groove portion is formed uniformly, or the case where the production speed is reduced to half or less and the productivity is deteriorated.

The wrinkle ratio of the paper layer 23 can be measured, for example, as follows.

(1) A sample for measurement in which the length of the machine direction (MD) is 150 mm and the length of the width direction (CD) is 50 mm is cut out from the paper layer after the wrinkles are formed.

(2) A straight line extending in the machine direction (MD) by a length of 100 mm is drawn on the surface of the center of the measurement sample in the width direction (CD). When drawing this line, care must be taken not to break the paper layer.

(3) The measurement sample was immersed in water for 10 seconds.

(4) The measurement sample was taken out from the water and placed on a glass plate. Then, the measurement sample was extended in the machine direction (MD) before the wrinkles of the paper layer disappeared.

(5) The length A (mm) of the machine direction (MD) of the straight line drawn on the sample for measurement after the extension was measured.

(6) The wrinkle ratio was calculated from the following formula.

Wrinkle rate (%) = (A-100) / A × 100

(7) Repeat the above (3) to (6) for the same measurement sample.

(8) The average value of the three wrinkle ratios calculated is taken as the wrinkle ratio of the paper layer.

A photomicrograph showing the surface of the corrugated paper layer is shown in Figure 6. From this micrograph, it is understood that the paper layer is formed with wrinkles extending in the width direction (CD) and arranged in the machine direction (MD).

Next, as shown in Fig. 1, the wrinkled paper layer 23 is moved on the mesh outer peripheral surface of the cylindrical suction drum 13. At this time, high pressure water vapor is sprayed onto the paper layer 23 from one of the steam nozzles 14 disposed above the outer peripheral surface of the suction drum 13. The suction drum 13 is internally provided with a suction device, and the water vapor sprayed from the steam nozzle 14 is sucked by the suction device. By the high-pressure water vapor sprayed from the steam nozzle 14, a groove having a larger width than the concave portion formed by the high-pressure water flow is formed on the surface of the paper layer 23. Thereby, the volume of the paper layer is made high.

The surface of the paper layer 23 on which the high-pressure water vapor is sprayed is preferably the surface on the opposite side to the surface on which the high-pressure water stream is sprayed. The reason is that the fibers of the paper layer 23 sprayed over the surface of the high-pressure water stream are strongly entangled as compared with the fibers of the paper layer 23 on the opposite side of the surface on which the high-pressure water stream is sprayed, and the paper layer is unwound by high-pressure water vapor. Fiber requires more energy. Further, when high-pressure steam is sprayed on the surface of the paper layer 23 on which the high-pressure water jet is sprayed, the strength of the paper layer 23 may be extremely weak.

The high-pressure steam injected from the steam nozzle 14 may be water vapor composed of 100% water or other gas vapor such as air. However, the high-pressure steam sprayed from the steam nozzle 14 is preferably water vapor composed of 100% water.

The temperature of the high pressure water vapor is preferably from 105 to 250 °C. By the high-pressure water vapor of this temperature range, the paper layer 23 can also be dried when the high-pressure water vapor is sprayed on the paper layer 23, so that the volume of the paper layer 23 becomes large while the paper The layer is dried. Further, the water content of the paper layer 23 after the high-pressure water vapor is sprayed is lower than the water content of the paper layer 23 before the high-pressure water vapor is sprayed by 5% or more. Since the hydrogen bonding of the fibers of the paper layer 23 becomes strong when the paper layer 23 is dried, the strength of the paper layer 23 is increased, and the bulky paper layer 23 is less likely to be crushed. Further, the wrinkles formed on the surface of the paper layer 23 opposite to the surface on which the high-pressure water vapor is sprayed are not easily lost. By the strength of the paper layer 23 becoming high, it is possible to prevent the paper layer 23 from being perforated or broken even when the high-pressure water vapor is further sprayed.

Fig. 7 shows an example of the steam nozzle 14 disposed above the suction drum 13. The vapor nozzle 14 ejects a plurality of high-pressure water vapors 51 arranged in the machine direction (MD) and the width direction (CD) of the paper layer 23 toward the paper layer 23 on which the wrinkles 52 are formed. As a result, a plurality of groove portions 53 extending in the width direction (CD) of the paper layer 23 and extending in the machine direction (MD) are formed on the upper surface of the paper layer 23.

Fig. 8 is a view showing an example of the nozzle hole 141 of the high pressure water vapor nozzle 14. As in the vapor nozzle 14 shown in Fig. 8, the nozzle hole arrays of the plurality of nozzle holes 141A in the width direction (CD) are arranged in two rows in the machine direction (MD). Therefore, as shown in Fig. 7, the plurality of high-pressure water vapors 51 arranged in the width direction (CD) are arranged in two rows in the machine direction (MD). Further, the number of rows of the nozzle hole arrays of the plurality of nozzle holes arranged in the width direction (CD) in the machine direction (MD) is not limited to two columns, and may be one or three or more columns. In addition, the plurality of high-pressure steam nozzles may be arranged in the machine direction (MD), thereby arranging the nozzle holes arranged in the plurality of nozzle holes in the width direction (CD) in the mechanical direction. (MD) arrangement. The nozzle holes are arranged in a plurality of nozzle holes arranged in the width direction (CD) in a plurality of nozzle holes, and the nozzle holes are arranged in a plurality of directions in the machine direction (MD), thereby reliably forming the groove portion in the paper layer, thereby reliably improving the paper layer. volume of.

The nozzle hole of the vapor nozzle 14 preferably has a diameter of 150 to 500 μm. When the diameter of the nozzle hole is less than 150 μm, there is a problem that the energy is insufficient and the fiber cannot be sufficiently removed. Further, when the pore diameter of the vapor nozzle 14 is larger than 500 μm, there is a problem that the energy is too large and the substrate is excessively damaged.

The hole pitch of the nozzle holes (the distance between the centers of the nozzle holes adjacent to each other in the width direction (CD)) is preferably 1.0 to 2.5 mm. When the hole pitch of the nozzle holes is less than 1.0 mm, there is a fear that the pressure resistance of the steam nozzle 14 is lowered and damage is caused. Further, when the hole pitch of the nozzle holes is larger than 2.5 mm, wrinkles may remain on the surface of the paper layer 23 on which the high-pressure steam is sprayed.

The vapor pressure of the high-pressure steam injected from the vapor nozzle 14 is preferably 0.2 to 1.5 MPa. When the vapor pressure of the high-pressure steam is less than 0.2 MPa, the volume of the paper layer 23 may not become too large by the high-pressure steam. Further, when the vapor pressure of the high-pressure steam is more than 1.5 MPa, the paper layer 23 may be perforated, or the paper layer 23 may be broken and sprayed. Further, since the fibers of the paper layer 23 are unwound when the paper layer 23 is wrinkled, the paper layer 23 can be made bulky by the high-pressure steam having a low vapor pressure as compared with the case where the wrinkles are not formed.

When the paper layer 23 is sprayed with high-pressure water vapor, the fiber of the paper layer 23 The dimension is unwound and then the volume of the paper layer 23 is made larger. Thereby, the softness of the paper layer 23 is improved, and the touch of the paper layer 23 is improved. When the paper layer 23 is subjected to high-pressure steam, the fiber of the paper layer 23 is unwound, and the principle of increasing the volume of the paper layer 23 will be described with reference to FIG. However, this principle does not limit the invention.

As shown in FIG. 9, when the steam nozzle 14 injects the high-pressure steam 51, the high-pressure steam 51 comes into contact with the suction drum 13. Most of the high pressure water vapor 51 is bounced back to the suction drum 13. Thereby the fibers of the paper layer 23 are rolled up and then unwound. Then, the fibers of the unwound paper layer 23 are separated by the high-pressure water vapor 51, and a groove portion is formed in the paper layer 23. The fiber to be removed is moved toward the width direction side of the portion 54 of the high-pressure water vapor 51 which is in contact with the paper layer 23, so that the volume of the paper layer 23 becomes high. In addition, the fibers of the paper layer 23 are rolled up and then unwound, whereby fluffing is formed on the surface of the paper layer. In particular, since the paper layer 23 is formed with wrinkles, the paper layer is wavy (petal-like), and thus it is easy to form fluff. Thereby, the wiping property of the nonwoven fabric can be improved. Further, the moisture contained in the paper layer 23 is evaporated by the heat of the high-pressure steam 51, and is removed from the paper layer 23. Thereby, the drying of the paper layer 23 is carried out.

In the method for producing a nonwoven fabric according to an embodiment of the present invention, in order to increase the volume of the paper layer, a groove portion is formed in the paper layer by high-pressure steam. Therefore, in order to increase the amount of fibers dislodged by the high-pressure water vapor, the width of the groove formed by the high-pressure water vapor is larger than the width of the concave portion formed by the high-pressure water flow.

Since the paper layer fibers which are sprayed with the high-pressure water vapor portion are unwound, the wrinkles are destroyed on the surface on which the high-pressure water vapor is sprayed, and And the wrinkles disappear. Thereby, the paper layer 23 is further thickened. Further, the surface of the paper layer on which the wrinkles are broken by the high-pressure steam is sprayed, and the wrinkles remaining on the surface opposite to the surface on which the high-pressure steam is sprayed are less likely to extend in the machine direction (MD). In other words, the portion where the wrinkles on the surface on which the high-pressure steam is sprayed is broken is a fixed portion where the wrinkles remaining on the surface on the opposite side to the surface on which the high-pressure steam is sprayed are fixed. Therefore, even if the manufactured non-woven fabric is in a wet state, the wrinkles remaining on the surface opposite to the surface on which the high-pressure water vapor is ejected can be maintained. In other words, even if the non-woven fabric is in a wet state, the volume of the non-woven fabric which is raised by the wrinkles can be maintained.

As described above, the volume of the paper layer 23 is increased by the lower portion: a portion where the fibers are gathered by the high-pressure water vapor 51, and a portion where the high-pressure water vapor 51 is sprayed, thereby causing the wrinkles 52 to be broken, And wrinkles remaining on the opposite side of the surface on which the high-pressure steam 51 is sprayed. Therefore, in the method for producing a nonwoven fabric according to an embodiment of the present invention, the volume of the nonwoven fabric can be increased as compared with the case where only high-pressure water vapor is sprayed on the paper layer.

Fig. 10 is a schematic perspective view showing a part of the paper layer 23 (the position of the symbol 25 in Fig. 1) on which the high-pressure water vapor is sprayed. The paper layer 23 has a longitudinal direction, a lateral direction intersecting the longitudinal direction, a thickness direction perpendicular to the longitudinal direction and the lateral direction, a surface perpendicular to the thickness direction, and a thickness direction with respect to one surface. On the other side, the surface of the other side has a plurality of groove portions 53 extending in the longitudinal direction and arranged in the lateral direction, and has a concave portion 32 extending in the longitudinal direction and spaced apart in the lateral direction on the other surface. On the other side, having a wrinkle 52 extending in the lateral direction and arranging in the longitudinal direction, and There is no wrinkle 52 on one side. Here, the longitudinal direction corresponds to the machine direction (MD), and the lateral direction corresponds to the width direction (CD). On one side of the surface, a groove that is extended in the longitudinal direction by the groove portion 53 in the lateral direction and that is arranged in the lateral direction is formed.

In the paper layer 23, a region 55 on the surface side of the concave portion 32 formed by the high-pressure water flow is present, and a strong region of the paper layer 23 is formed, and the region 56 on the surface side of the groove portion 53 is formed by the high-pressure water vapor. The high-pressure water vapor causes the strength of the paper layer 23 to be slightly weaker than the above-described region 55, but the paper layer 23 becomes a bulky region. In this manner, the paper layer 23 is formed with a strong region 55 and a weak but bulky region 56, whereby the balance between the strength and the bulk of the paper layer 23 can be obtained. In other words, it is thereby possible to form a bulky and high-strength paper layer 23.

As shown in FIG. 10, the wrinkles 52 are not left on the surface on which the groove portion 53 is formed. As described above, the wrinkles 52 are destroyed by the high-pressure water vapor. Since the volume in which the wrinkles are large is unwound before being broken by the high-pressure water vapor wrinkles, the volume of the region 56 on the surface side formed by the high-pressure water vapor groove portion 53 becomes extremely high. When the volume of the non-woven fabric is increased, when the non-woven object is used for wiping, the ability of the non-woven fabric to collect the dirt becomes high. Therefore, the wiping property of the non-woven fabric is improved by making the paper layer 23 very bulky.

As shown in Fig. 10, the surface on the opposite side to the surface on which the high-pressure water vapor is sprayed, in other words, the wrinkle 52 remains on the surface on which the concave portion 32 is formed by the high-pressure water flow. Thereby, even in the surface on the opposite side to the surface on which the high-pressure water vapor is sprayed, the wiping property of the nonwoven fabric can be made good.

The paper layer 23 is more easily fluffed by the unwinding of the corrugated paper layer 23 by the high-pressure water vapor as compared with the case where the paper layer 23 in the planar state is released by the high-pressure water vapor. The wrinkles are formed on the paper layer 23, whereby the paper layer 23 can be undulated by the high-pressure water vapor in a state of being corrugated (petidal). Therefore, the paper layer 23 is likely to be raised. Further, as described above, since the short fibers having a fiber length of 20 mm or less are used in the paper layer 23, the paper layer 23 is more likely to be raised. Therefore, as shown in Fig. 10, one end of the fiber in the paper layer 23 which has been sprayed with the high-pressure water vapor protrudes from the surface of the paper layer 23, and the fuzzing 57 is generated in the paper layer 23. By the raising of the hair 57, the surface of the non-woven fabric is easily attached to the dirt, so that the fluffing 57 allows the non-woven fabric to be more carefully wiped off.

The suction roller 13 that sucks the high-pressure water vapor sprayed from the steam nozzle 14 attracts the suction force of the paper layer 23 by the suction device built in the suction roller 13, preferably -1~- 12kPa. When the suction force of the suction drum 13 is less than -1 kPa, there is a case where the vapor is not completely sucked and the discharge is caused. Further, when the suction force of the suction drum 13 is larger than -12 kPa, the amount of fibers falling into the suction becomes large.

The distance between the front end of the vapor nozzle 14 and the surface of the paper layer 23 is preferably 1.0 to 10 mm. When the distance between the tip end of the vapor nozzle 14 and the surface of the paper layer 23 is less than 1.0 mm, there is a problem that the paper layer 23 is perforated or the paper layer 23 is broken and scattered. Further, when the distance between the tip end of the vapor nozzle 14 and the surface of the paper layer 23 is more than 10 mm, the force for forming the groove portion on the surface of the paper layer 23 by the high-pressure water vapor is dispersed, and the groove portion is formed on the surface of the paper layer 23 or is broken. Wrinkle formed by paper layer 23 A situation in which energy efficiency deteriorates.

The water content of the paper layer 23 after the high-pressure water vapor is sprayed is preferably 40% or less, more preferably 30% or less. When the water content of the paper layer 23 after the high-pressure water vapor is sprayed is more than 40%, the water content of the paper layer 23 may be made difficult to be 5% or less by drying by a dryer described later. Further, in addition to the dryer to be described later, it is necessary to further add drying, and the manufacturing efficiency of the nonwoven fabric may be deteriorated.

Thereafter, as shown in FIG. 1, it is transferred to a dryer 22 different from the dryer 20. The dryer 22 is a nonwoven fabric which is sprayed with high-pressure water vapor and dried to a nonwoven fabric as a final product. The dryer 22 is, for example, a Yankee dryer. The dryer 22 adheres the paper layer 23 to the surface of a cylindrical dryer heated to about 150 ° C by steam, and the paper layer 23 is dried.

The paper layer 23 which has passed through the dryer 22 must be sufficiently dried. Specifically, the water content of the paper layer 23 after passing through the dryer 22 is preferably 5% or less. Further, when the water content of the paper layer 23 immediately after the high-pressure water vapor is sprayed is 5% or less, the paper layer 23 which has been sprayed with the high-pressure water vapor may be dried without using the dryer 22 or the like.

The dried paper layer 23 (non-woven fabric) is taken up by the winder 21.

A photomicrograph of the surface of the non-woven fabric manufactured as above is shown in Fig. 11. Fig. 11(a) is a photomicrograph of a surface of a non-woven fabric which is sprayed with high-pressure water vapor. Fig. 11(b) is a photomicrograph of the surface of the non-woven fabric on the opposite side of the surface on which the high-pressure water vapor is sprayed. It can be seen from Fig. 11 that there is no wrinkle on the surface of the high-pressure water jet, but it is steamed in high-pressure water. The opposite side of the face of the gas has wrinkles.

Further, if the step of forming the wrinkles is performed before the high-pressure water vapor is ejected, but after the high-pressure water vapor is ejected, the step of forming the wrinkles by spraying the water vapor on the paper layer may be destroyed, or A problem occurs in which the fiber is unwound to cause the fiber to fall off and the sheet to break.

The non-woven fabric produced is cut into a predetermined size as described above, whereby the nonwoven fabric can be used as a dry wiping paper. Further, the nonwoven fabric produced is cut into a predetermined size as described above, and the cut nonwoven fabric is immersed in a predetermined amount of the chemical liquid, whereby the nonwoven fabric can be used as a wet wipe paper.

By increasing the volume of the paper layer as described above, the ability of the nonwoven fabric to collect dirt is enhanced, so that the wipes produced by the nonwoven fabric can be carefully wiped off. Further, since the wrinkles 52 are formed on the paper layer 23, the wrinkles on one side of the paper layer are destroyed by the high-pressure water vapor, so that the wiping paper is produced from the non-woven fabric, for example, the step of cutting the non-woven fabric, and the non-woven fabric is used. The step of immersing in the chemical liquid or the like causes the wrinkles formed on the surface opposite to the side on which the high-pressure water vapor is sprayed to not disappear. Therefore, even in the surface on the opposite side to the surface on which the groove portion is formed by the high-pressure water vapor, the wiping paper can carefully remove the dirt.

The above description is only an example, and the invention is not limited to the above embodiment.

[Examples]

The invention will be explained in more detail below on the basis of examples. However, the invention is not limited by the embodiments.

In the examples and comparative examples, the moisture content of the paper layer before the steam is sprayed, the basis weight of the paper layer before the wrinkles, the basis weight of the paper layer after the wrinkles, the dry thickness, the density, the dry tensile strength, the dry tensile ductility, and the wetness. The tensile strength, the wet stretch ductility, the dirt removal rate of the high-pressure steam spray surface, and the dirt removal rate of the high-pressure water jet surface were measured as follows.

(water content of the paper layer before steam spraying)

A sample piece having a size of 30 cm × 30 cm was sampled from the paper layer dried by the dryer 20, and the weight (W1) of the sample piece was measured. Thereafter, the sample piece was allowed to stand in a constant temperature bath at 105 ° C for 1 hour and dried, and then the weight (D1) was measured. The moisture content of the paper layer before vapor deposition is the average of the measured values of N=10.

Moisture content of paper layer before steam spraying = (W1-D1) / W1 × 100 (%)

(basis weight of the paper layer before wrinkles)

The basis weight of the paper layer was measured by sampling a sample having a size of 30 cm × 30 cm from the paper layer before the wrinkles formed by drying in the dryer 20, and measuring the weight of the sample for measurement. The basis weight of the paper layer is the average of the measured values of N=10.

(basis weight of paper layer after wrinkling)

The basis weight of the paper layer was measured by sampling a sample having a size of 30 cm × 30 cm from the paper layer before the high-pressure steam was sprayed, and measuring the weight of the sample for measurement. The basis weight of the paper layer is the average of the measured values of N=10.

(dry thickness)

A sample for measurement of a size of 10 cm × 10 cm was sampled from the manufactured non-woven fabric. The thickness of the sample for measurement was measured using a thickness gauge (a model FS-60DS manufactured by Daiei Chemical Seiki Co., Ltd.) having a measuring instrument of 15 cm ² and measuring conditions of a load of ³ gf/cm ² . Three thicknesses were measured for one sample for measurement, and the average of three thicknesses was used as the dry thickness.

(density)

A sample for measurement of a size of 10 cm × 10 cm was sampled from the manufactured non-woven fabric. The weight of the sample for measurement was measured, and the density of the nonwoven fabric was calculated from the above-mentioned dry thickness.

(dry tensile strength)

From the non-woven fabric to be manufactured, a long strip test piece of 25 mm width in the machine direction of the paper layer in the longitudinal direction and a long strip test piece of 25 mm width in the width direction of the paper layer were cut out to prepare a sample for measurement. . The sample for measuring the machine direction and the width direction is used, and the maximum load capacity is used. A tensile tester for a 50N dynamometer (made by Shimadzu Corporation, a tabletop precision universal tester type AGS-1kNG), for each of the three test specimens, with a jig spacing of 100 mm, 100 mm/min. The tensile strength was measured under the conditions of the stretching speed. The average value of the tensile strengths of the three measurement samples of the sample for measurement in the machine direction and the width direction was defined as the dry tensile strength in the machine direction and the width direction.

(dry stretch ductility)

From the non-woven fabric to be manufactured, a long strip test piece of 25 mm width in the machine direction of the paper layer in the longitudinal direction and a long strip test piece of 25 mm width in the width direction of the paper layer were cut out to prepare a sample for measurement. . For the measurement of the machine direction and the width direction, a tensile tester (available from Shimadzu Corporation, a tabletop precision universal tester type AGS-1kNG) equipped with a dynamometer with a maximum load capacity of 50 N was used. For the measurement samples, the tensile ductility was measured under the conditions of a jig pitch of 100 mm and a tensile speed of 100 mm/min. Here, the tensile ductility refers to a value calculated by dividing the maximum spread (mm) when the measurement sample is pulled by the tensile tester by the jig pitch (100 mm). The average value of the tensile ductility of the three measurement samples of the sample for measurement in the machine direction and the width direction was defined as the dry stretch ductility in the machine direction and the width direction.

(wet tensile strength)

From the non-woven fabric manufactured, the strip test piece of 25 mm width in which the longitudinal direction is the mechanical direction of the paper layer, and the width direction of the paper layer in the longitudinal direction are cut. In the long test piece of 25 mm wide, a sample for measurement was prepared, and the sample for measurement was immersed in water (water-containing magnification, 250%) 2.5 times of the sample for measurement. Then, a tensile tester (available from Shimadzu Corporation, a tabletop precision universal tester type AGS-1kNG) equipped with a dynamometer having a maximum load capacity of 50 N was used for the measurement of the machine direction and the width direction. For each of the three measurement samples, the stretching speed was measured under the conditions of a jig pitch of 100 mm and a tensile speed of 100 mm/min. The average value of the tensile strength of each of the three measurement samples of the sample for measurement in the machine direction and the width direction was defined as the wet tensile strength in the machine direction and the width direction.

(wet stretch ductility)

From the non-woven fabric to be manufactured, a long strip test piece of 25 mm width in the machine direction of the paper layer in the longitudinal direction and a long strip test piece of 25 mm width in the width direction of the paper layer were cut out to prepare a sample for measurement. The sample for measurement was immersed in water (water content ratio, 250%) which was 2.5 times the mass of the sample for measurement. Then, a tensile tester (available from Shimadzu Corporation, a tabletop precision universal tester type AGS-1kNG) equipped with a dynamometer having a maximum load capacity of 50 N was used for the measurement of the machine direction and the width direction. Tensile ductility was measured for the three measurement samples under the conditions of a jig pitch of 100 mm and a tensile speed of 100 mm/min. The average value of the tensile ductility of the three measurement samples of the sample for measurement in the machine direction and the width direction was defined as the wet stretchability in the machine direction and the width direction.

(Fouling removal rate of high pressure steam spray surface)

The dirt removal rate of the high-pressure water vapor surface (high-pressure water vapor ejection surface) of the non-woven fabric was measured in the following order.

(1) A simulated soil paste containing the following components: 12.6% by weight of carbon black (Carbon Black, manufactured by Miyama Pharmaceutical Co., Ltd.), 20.8% by weight of tallow extremely hardened oil (manufactured by Nippon Oil & Fat Co., Ltd.), and 66.6. 5% by weight of mobile paraffin (manufactured by Nacalai Tesque Co., Ltd.). Soil paste: A simulated soil paste was prepared by diluting a simulated soil paste with hexane so as to have a weight ratio of 85:15 by hexane (manufactured by Nacalai Tesque Co., Ltd.).

(2) 0.05 ml of the simulated soiling agent was dropped on the product, and the article in which the simulated soiling agent was dropped was dried for 24 hours in a condition of a temperature of 20 ° C and a humidity of 60%.

(3) After drying, use a scanner (Calario GT-750, manufactured by Epson Co., Ltd.) for the type of original: film, type: positive film, image: 16-bit grayscale, quality: image quality priority, resolution: 1200 dpi, original size: 68.6 × 237 mm, output: The condition of the product was taken in, and the color of the range of 16.9 mm × 16.9 mm in the portion of the product to which the simulated simulated agent was attached was calculated from the image data of the image taken. Here, the hue is calculated as follows. Set the predetermined threshold to correct the image binarization of the grayscale. The threshold for binarization is set such that the gray scale of the portion to which the dirt adheres is 0 (black), and the gray scale of the portion where the dirt is not attached becomes 255 (white). Then, using Excel2007 (manufactured by Microsoft Corporation), the horizontal axis is gray. The order and vertical axis are histograms of frequency. The frequency of the gray scale of 0 is used as the hue.

(4) The simulated soiling agent adhered to the product by a non-woven fabric is applied by a plastic film-and-sheet-friction coefficient test method (JIS-K-7125:1999). The non-woven fabric produced was sampled with a sample of a size of 140 × 190 mm, and a sample for measurement was placed on a table of a friction coefficient measuring device (Test Machine Industry Co., Ltd.) with the high-pressure water vapor ejection surface facing upward. At this time, the measurement sample is placed in the direction in which the sample is wiped (machine direction (MD) or width direction (CD)) in the moving direction of the slider. The product to which the simulated soiling agent is attached is placed on the measurement sample so that the surface on which the simulated soiling agent is attached is placed in contact with the sample to be measured, and the sliding sheet and the measuring force are disposed on the opposite side of the surface of the product to which the simulated soiling agent is attached. meter. Then, the friction coefficient was measured once at a feed rate of 150 mm/min and a load of 60 g, whereby the simulated soil agent adhering to the product was wiped with the sample for measurement.

(5) After wiping the simulated soiling agent attached to the product, the image of the product is taken in the same condition using the scanner, and the image of the image taken before is calculated to be the same as the range of the calculated color tone before the simulated soiling agent is wiped. The hue of the range.

(6) Wiping the color tone before the simulated soiling agent attached to the product minus the color tone after wiping the simulated soiling agent attached to the product, and calculating the color tone change rate by wiping the color tone before the simulated soiling agent attached to the product . This value is used as the dirt removal rate of the sample for measurement. When the wiping property of the sample for measurement is good, the simulated soiling agent adhering to the product can be wiped clean by the sample for measurement, and thus the rate of change in color tone, in other words, the degree of soil removal, is improved. another On the other hand, if the wiping property of the sample for measurement is inferior, since the simulated soiling agent remains in a large amount on the product in which the simulated soiling agent is wiped off by the measurement sample, the rate of change in color tone, in other words, the dirt removal rate, is lowered. By such a value of the dirt removal rate, the ability of the measurement sample to wipe the dirt can be evaluated. The soil removal rate was measured for the three measurement samples, and the average value thereof was used as the soil removal rate of the measurement sample.

(Foul removal rate of high pressure water jet surface)

In the table of the friction coefficient measuring device, the high-pressure water jet surface is measured in the same manner as the high-pressure water jet surface, except that the measurement sample is placed such that the high-pressure water jet surface (the surface on which the high-pressure water jet is sprayed) faces upward. The dirt removal rate.

Hereinafter, the production methods of the examples and the comparative examples will be described.

(Example 1)

The first embodiment was produced using the nonwoven fabric manufacturing apparatus 1 of one embodiment of the present invention. A papermaking raw material containing 70% by weight of conifer bleached kraft pulp (NBKP) and a fineness of 1.1 dtex and a fiber length of 7 mm of yttrium (manufactured by DAIWABO RAYON Co., Ltd., CORONA) was produced. Then, the papermaking raw material was supplied to a paper layer forming belt (OS80, manufactured by Japan Hier Kang Co., Ltd.) using a raw material head, and the papermaking raw material was dehydrated using a suction box to form a paper layer. At this time, the paper layer of the paper layer had a water content of 80%. Thereafter, two high pressure water jet nozzles were used to spray the high pressure water stream onto the paper layer. The high-pressure water flow energy of the high-pressure water jet sprayed on the paper layer using two high-pressure water jet nozzles was 0.2846 kW/m ² . Here, the high-pressure water flow energy is calculated by the following formula.

Energy (kW/m ² ) = 1.63 × injection pressure (kg/cm ² ) × injection flow rate (m ³ /min) / treatment speed (M / min) / 60

Here, the injection flow rate (cubic M/min) = 750 × total opening area of the orifice (m ² ) × injection pressure (kg/cm ² ) ^0.495

In addition, the distance between the front end of the high pressure water jet nozzle and the upper surface of the paper layer is 10 mm. Further, the nozzle hole of the high-pressure water jet nozzle has a hole diameter of 92 μm, and the nozzle hole has a hole pitch of 0.5 mm.

After being transferred to the two paper layer conveyance conveyors, the paper layer was transferred to a Yankee dryer heated to 160 ° C and dried. The line speed of this Yankee dryer is 80m/min. Then, the paper layer attached to the surface of the Yankee dryer is separated from the surface by a doctor blade to perform wrinkle processing to form wrinkles in the paper layer. The line speed of the Yankee dryer which dried the paper layer which sprayed the high pressure water vapor mentioned later was 68 m/min. With the speed difference of the line speeds of the two Yankee dryers, the wrinkle ratio of the formed wrinkles can be made 14%.

Next, a steam nozzle is used to spray high-pressure water vapor on the opposite side of the paper layer from which the high-pressure water flow surface is sprayed (opposite side of the high-pressure water jet surface). At this time, the vapor pressure of the high pressure water vapor is 0.7 MPa, and the vapor The temperature is 210 °C. In addition, the distance between the front end of the vapor nozzle and the surface of the paper layer was 2.0 mm. The nozzle holes of the steam nozzle are arranged in two rows in the machine direction (MD). Further, the nozzle hole of the vapor nozzle has a pore diameter of 500 μm and a hole pitch of 2.0 mm. In addition, the attraction force of the suction roller for attracting the paper layer was -5.0 kPa. A stainless steel 18 mesh opening sleeve is used for the outer circumference of the suction cylinder. The water content of the paper layer after the high pressure water vapor was sprayed was 35%.

Then, the paper layer was transferred to a Yankee dryer heated to 150 ° C and dried to a moisture content of 5% or less. The dried paper layer became Example 1.

(Example 2)

In Example 2, except that the vapor pressure of the high-pressure steam was changed to 115 ° C and the vapor pressure was changed to 0.2 MPa, the other was produced by the same method as the production method of Example 1.

(Example 3)

In the third embodiment, except that the nozzle holes of the steam nozzles are arranged in six rows in the machine direction (MD), the hole diameter of the nozzle holes of the steam nozzle is set to 200 μm, and the hole pitch of the nozzle holes of the steam nozzle is set to 1.0 mm. The production was carried out by the same method as the production method of Example 1.

(Example 4)

In Example 4, the vapor pressure of the high pressure steam was set to 150 ° C, the vapor pressure was set to 0.5 MPa, the nozzle holes of the steam nozzle were arranged in the machine direction (MD) by 6 rows, and the nozzle hole of the steam nozzle was set to 200 μm. Further, the hole pitch of the nozzle holes of the steam nozzle was set to 1.0 mm, and the rest was produced by the same method as the production method of Example 1.

(Comparative Example 1)

In Comparative Example 1, except that no wrinkles were formed in the paper layer, the basis weight of the paper layer was adjusted to 50 g/m ^{2 in} order to obtain the same basis weight as the basis weight of the paper layer after the wrinkles of the Example, and no high-pressure water vapor was sprayed on the paper layer. The rest were produced by the same method as the production method of Example 1.

(Comparative Example 2)

In Comparative Example 2, except that wrinkles were not formed in the paper layer, and the basis weight of the paper layer was adjusted to 50 g/m ² in order to obtain the same basis weight as the basis weight of the wrinkled paper layer of the Example, The production method of Example 1 was carried out in the same manner as in the production.

(Comparative Example 3)

Comparative Example 3 was produced by the same method as the production method of Example 1, except that the paper layer was not sprayed with high-pressure water vapor.

(Comparative Example 4)

In Comparative Example 4, the basis weight of the paper layer was adjusted to 50 g/m ² and the vapor temperature of the high-pressure steam was set so as not to form wrinkles in the paper layer, to be the same basis weight as the basis weight of the paper layer after the wrinkles of the examples. The vapor pressure was set to 0.2 MPa at 115 ° C, and the rest was produced by the same method as the production method of Example 1.

(Comparative Example 5)

In Comparative Example 5, the basis weight of the paper layer was adjusted to 50 g/m ^{2 in} order to form a wrinkle in the paper layer, and the basis weight of the paper layer was the same as the basis weight of the paper layer after the wrinkle of the embodiment, and the nozzle hole of the steam nozzle was The machine direction (MD) is arranged in six rows, the hole diameter of the nozzle hole of the steam nozzle is set to 200 μm, and the hole pitch of the nozzle hole of the steam nozzle is set to 1.0 mm, and the rest is the same as the manufacturing method of the first embodiment. The method is manufactured.

(Comparative Example 6)

In Comparative Example 6, except that the wrinkles were not formed in the paper layer, the basis weight of the paper layer was adjusted to 50 g/m ² in order to achieve the same basis weight as the basis weight of the paper layer after the wrinkles of the examples, and the vapor temperature of the high-pressure steam was set. The steam pressure was set to 0.5 MPa at 150 ° C, the nozzle holes of the steam nozzle were arranged in the machine direction (MD) in six rows, the nozzle hole diameter of the steam nozzle was set to 200 μm, and the nozzle pitch of the nozzle of the steam nozzle was set. The rest was 1.0 mm, and the rest was produced by the same method as the production method of Example 1.

The manufacturing conditions of the above examples and comparative examples are shown in Table 1.

The moisture content of the pre-vipping paper layer of the above examples and comparative examples, the basis weight of the paper layer before wrinkling, the basis weight of the paper layer after wrinkling, the dry thickness, the density, the dry tensile strength, the dry tensile ductility, and the wet drawing The tensile strength and wet tensile ductility are shown in Table 2.

The soil removal rate of the high pressure water vapor ejection surface of the above examples and comparative examples and the dirt removal rate of the high pressure water jet surface were shown in Table 3.

(1) Comparison of Examples 1 to 4 and Comparative Examples 1 to 6

The dry thicknesses of Examples 1 to 4 were all 0.55 mm or more. On the other hand, the dry thicknesses of Comparative Examples 1 to 6 were all less than 0.55 mm. Further, the densities of Examples 1 to 4 were all 010 g/m ³ or less. On the other hand, the density of Comparative Examples 1 to 6 was more than 10 g/m ³ except for Comparative Example 2. Therefore, it is understood that a non-woven fabric having a bulkiness and a low density can be produced by combining the steps of forming the wrinkles on the paper layer and the step of spraying the high-pressure water vapor on the paper layer.

(2) Comparison of Examples 1 to 4 and Comparative Examples 2 and 4 to 6

Main differences between Example 1 and Comparative Example 2, Example 2 and Comparative Example The main difference of 4, the main difference of Example 3 and Comparative Example 5, and the main difference between Example 4 and Comparative Example 6 are the steps for forming wrinkles in the paper layer. Thereby, it is understood that the step of forming the wrinkles on the paper layer is performed before the step of spraying the high-pressure water vapor on the paper layer, whereby the volume of the nonwoven fabric can be increased, and the density of the nonwoven fabric can be reduced.

(3) Comparison of Examples 1 to 4 and Comparative Example 1

In Comparative Example 1, the basis weight of the paper layer was adjusted to 50 g/m ^{2 in} order to obtain the same basis weight as the basis weight of the creped paper layer of the Example, and thus the basis weight was higher than that of the pleated front paper layer of the Example. In other words, the volume before the high-pressure water vapor was sprayed in Comparative Example 1 was higher than the volume before the formation of the wrinkles of Examples 1 to 4. If this point is taken into consideration, by comparing Examples 1 to 4 with Comparative Example 1, it is understood that the nonwoven fabric can be formed by the step of forming the wrinkles in the paper layer and the step of spraying the high-pressure water vapor on the paper layer. The volume is increased by about 60% or more.

(4) Comparison of Examples 1 to 4 and Comparative Example 3

In Comparative Example 3, the basis weight of the paper layer was adjusted to 50 g/m ^{2 in} order to achieve the same basis weight as the basis weight of the creped paper layer of the Example, and thus the basis weight was higher than that of the pleated front paper layer of the Example. In other words, the volume before the injection of the high-pressure water vapor of Comparative Example 3 was higher than the volume before the formation of the wrinkles of Examples 1 to 4. When this point is taken into consideration, by comparing Examples 1 to 4 with Comparative Example 3, it is understood that the volume of the nonwoven fabric can be increased by about 40% or more by spraying high-pressure steam on the paper layer.

(5) Comparison of the soil removal rate of Example 1 and the soil removal rate of Comparative Examples 2 and 3.

Comparing the soil removal rate of Example 1 with the soil removal rates of Comparative Examples 2 and 3, it is understood that the step of forming the wrinkles in the paper layer by the combination and the step of spraying the high-pressure water vapor on the paper layer are carried out. Non-woven wipeability.

1‧‧‧Nonwoven manufacturing equipment

11‧‧‧Material supply head

12‧‧‧High pressure water jet nozzle

13‧‧‧Attraction roller

14‧‧‧Vapor nozzle

15‧‧‧Attraction box

16‧‧‧Paper layer forming conveyor

17‧‧‧Attracting pickers

18,19‧‧‧Paper handling conveyor belt

20,22‧‧‧dryer

21‧‧‧Winding machine

23‧‧‧paper layer

25‧‧‧ symbol position

24‧‧‧ symbol position

26‧‧‧Scraper

Claims (12)

A non-woven fabric manufacturing method comprising: supplying a water-containing papermaking raw material to a unidirectional moving belt to form a paper layer on the belt; and spraying a high-pressure water jet on the paper layer to form a surface on the surface toward the machine a step of extending the direction and arranging the recesses spaced apart in the width direction; and adhering the paper layer that has been sprayed with the high-pressure water stream to the surface of the rotating cylindrical dryer, thereby drying the paper layer that has been sprayed with the high-pressure water stream into 10 a step of moisture content of ~45%; the step of separating the paper layer adhered to the surface of the cylindrical dryer from the surface by a doctor blade, thereby forming a wrinkle in the paper layer; and from the steam nozzle, The surface on which one of the wrinkled paper layers is formed is sprayed with high-pressure water vapor, thereby causing wrinkles on the other side of the paper layer while ruining the wrinkles on one side of the paper layer, and will have A step in which the width of the concave portion is larger and the groove extending in the machine direction is formed on one of the surfaces of the paper layer. The method of manufacturing a non-woven fabric according to claim 1, wherein a nozzle pitch of the nozzle of the steam nozzle is 1.0 to 2.5 mm. The method for producing a nonwoven fabric according to the first or second aspect of the invention, wherein the high-pressure steam has a vapor pressure of 0.2 to 1.5 MPa. Manufacture of non-woven fabrics as described in claim 1 or 2 In the method, when the high-pressure steam is injected from the steam nozzle, the paper layer is attracted by an attractive force of -1 to -12 kPa. The method for producing a non-woven fabric according to claim 1 or 2, wherein the water content of the paper layer after the high-pressure steam is sprayed is 40% or less. The method for producing a non-woven fabric according to claim 5, wherein the water content of the paper layer after the high-pressure steam is sprayed is lower than a moisture content of the paper layer before the high-pressure steam is sprayed by 5% or more. The method for producing a nonwoven fabric according to the first or second aspect of the invention, wherein the distance between the front end of the vapor nozzle and the surface of the paper layer is 1.0 to 10 mm. The method for producing a nonwoven fabric according to claim 1 or 2, further comprising the step of drying the paper layer on which the second groove is formed and drying it to a moisture content of 5% or less. The method for producing a nonwoven fabric according to claim 1 or 2, wherein the step of forming a wrinkle in the paper layer forms a wrinkle on the paper layer at a wrinkle ratio of 5 to 50%. The method for producing a nonwoven fabric according to the first or second aspect of the invention, wherein the steam nozzle includes a plurality of nozzle hole rows of nozzle holes arranged in the width direction in the machine direction. A non-woven fabric having a longitudinal direction, a transverse direction intersecting the longitudinal direction, a thickness direction perpendicular to the longitudinal direction and the lateral direction, a plane perpendicular to the thickness direction, and One of the faces of the one surface facing the other in the thickness direction has the above-mentioned one surface, and the groove extending in the longitudinal direction and arranged in the lateral direction, and having the other surface extending in the longitudinal direction Further, the concave portions that are arranged at intervals in the lateral direction have wrinkles that extend in the lateral direction and are arranged in the longitudinal direction on the other surface, and do not have the wrinkles on the one surface. The non-woven fabric according to claim 11, wherein the fiber contained in the nonwoven fabric has a fiber length of 20 mm or less and is raised on the one surface.