JP3825369B2 - Non-woven - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a nonwoven fabric suitable for use as a water-absorbing kitchen paper, a dirt wiping sheet, or the like.
[0002]
[Prior art]
Conventionally, a nonwoven fabric obtained from thermoplastic synthetic fibers having a fineness of 1 to 10d and pulp fibers is embossed to form a large number of irregularities on the surface, and the nonwoven fabric is used as a water-absorbing kitchen paper or a sheet for wiping dirt. That is well known.
[0003]
[Problems to be solved by the invention]
In the prior art kitchen papers, since synthetic fibers have relatively high rigidity and elasticity, it is not always easy to form irregularities on the surface by embossing or the like. In particular, when a fine unevenness or an unevenness having a sharp contour shape is required, the tendency becomes strong.
[0004]
The subject of this invention is providing the nonwoven fabric which is excellent in a softness | flexibility and water absorption, and has a big wiping effect.
[0005]
[Means for Solving the Problems]
The features of the present invention for solving the above-described problems are as follows. 1stly, it is a nonwoven fabric which contains an ultrafine thermoplastic synthetic fiber, and has the 1st surface and the 2nd surface on the opposite side, Comprising: This nonwoven fabric is 7-30 mm in length, and fineness 0.1-0.8d Slanted slurry containing 0.5 to 20% by weight of a fiber component that is a mixture of 90:10 to 10:90 in a weight ratio of the above ultrafine thermoplastic synthetic fiber and 2 to 7 mm long pulp fiber A wet sheet obtained by feeding on an endless belt and then dewatering, mechanically entangles the fiber components mixed in the wet sheet substantially uniformly with each other under a jet of high-pressure columnar water ; dehydrated after scolding, dried by heating, lies in that it is formed in the form of the nonwoven fabric having a basis weight 10 to 80 g / m ^2, the second, the second surface to the nonwoven fabric in the form Many convex from the side to the first surface side The number of raised portions is that they are arranged at a constant pitch in the vertical and horizontal directions while maintaining the entangled state.
[0006]
Preferred embodiments of the present invention include the following points.
[0007]
The thermoplastic synthetic fiber is a meltblown fiber, the height of the raised portion is 0.2 to 5 mm, the pitch in the vertical and horizontal directions is 1 to 10 mm, and the nonwoven fabric is kitchen paper.
[0008]
In the present invention, “mechanical entanglement” means that fibers are entangled by jetting high-pressure water flow in obtaining a nonwoven fabric having a sheet form with fibers, and other means for forming sheet forms, that is, fibers It does not include bonding the fibers with a binder and fusion bonding the fibers with heating.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The details of the nonwoven fabric according to the present invention will be described below with reference to the accompanying drawings.
[0010]
The nonwoven fabric 1 shown by the top view in FIG. 1 can be used as a kitchen paper 1A described later, and has a basis weight of 10 to 80 g / m ² . The nonwoven fabric 1 includes 90 to 10% by weight of ultrafine thermoplastic synthetic fiber 3 having a length of 7 to 30 mm and a fineness of 0.1 to 0.8 d, and 10 to 10 μm of pulp fiber 4 (for example, NBKP) having a length of 2 to 7 mm. Contains ~ 90% by weight. These fibers 3 and 4 are mixed almost uniformly, and the form as a nonwoven fabric is maintained when the fibers are mechanically entangled. Each fiber is randomly distributed or slightly oriented in the machine direction in the post-production process of the nonwoven fabric 1. The nonwoven fabric 1 does not use poval or other binder agents.
[0011]
FIG. 2 is a perspective view of kitchen paper 1 </ b> A having a large number of raised portions 51 obtained by embossing or debossing the nonwoven fabric 1 of FIG. 1. The raised portion 51 is formed so as to protrude from the lower surface side to the upper surface side of the kitchen paper 1A having a first surface (upper surface) and a second surface (lower surface) on the opposite side. The raised portions 51 have a height h, and are arranged at pitches y and x in the vertical direction and the horizontal direction. The height h is in the range of 0.2 to 5 mm, and y and x are in the range of 1 to 10 mm. The synthetic fiber 3 and the pulp fiber 4 may be slightly oriented from the base of the raised portion 51 toward the top, but are distributed randomly between the raised portions 51 as in FIG. .
[0012]
FIG. 3 is an example of the manufacturing process of the nonwoven fabric 1 and the kitchen paper 1A obtained therefrom, and is configured as follows. On the left side of the figure, a slurry tank containing 0.5 to 20% by weight of a fiber component in which the thermoplastic synthetic fiber 3 and the pulp fiber 4 form a weight ratio of 10:90 to 90:10 is contained in the slurry tank through the liquid feeding pipe 11. Send to 12. The slurry in the tank 12 is supplied onto the belt 13 in the suction zone 14 where the first endless belt 13 is inclined to the upper right. In the zone 14, the slurry is dehydrated by the vacuum pump 16 to obtain a wet sheet 17. Next, in the first zone 18, the pressurized columnar water flow from the first nozzle 19 is sprayed onto the sheet 17 to stabilize the formation, and the sheet 17 is transferred to the rotating drum 23 in the second zone 22. The water jetted in the first zone 18 is sucked by the suction mechanism 20. In the second zone 22, the pressurized columnar water stream from the second nozzle 24 is sprayed onto the sheet 17 placed on the drum 23 having a smooth surface, and the constituent fibers of the sheet 17 are mechanically strongly entangled with each other. Let Further, the sheet 17 is transferred to the second endless belt 28, and in the third zone 26, the pressurized columnar water stream from the third nozzle 27 is sprayed onto the sheet 17, and then the sheet 17 is dehydrated by the dehydration dryer 29. Heat drying to obtain the nonwoven fabric 31. The nonwoven fabric 1 shown in FIG. 1 is obtained by cutting the nonwoven fabric 31 into an appropriate size. The nonwoven fabric 31 is continuously supplied between the pair of embossing rolls 32 and 33. On the surface of one of the rolls 32, a shaping element 34 composed of a large number of conical or pyramidal projections is formed, and this element 34 presses against the nonwoven fabric 31 to have the raised portion 51 of FIG. A continuous body of kitchen paper 1A can be obtained. The nonwoven fabric 31 or the continuous body of kitchen paper 1 </ b> A is wound up as a roll 36. Further, if necessary, the kitchen paper 1A can be made by forming a large number of holes having a hole diameter of about 0.5 to 5 mm in the nonwoven fabric 31 or the continuous body of the kitchen paper 1A using an embossing machine or the like.
[0013]
In this manufacturing process, the second and third zones 22 and 26 are preferably provided with a suction mechanism 20 similar to the first zone 18. The pressure of the pressurized columnar water flow in the first to third zones 18, 22, and 26 is preferably in the range of 50 to 200 kgf / cm ² . Further, it is not always necessary to use all of the first to third zones 18, 22, and 26, and any one of the zones can be omitted.
[0015]
The non-woven fabric 31 obtained from the process illustrated in FIG. 3 includes the forming elements 34 due to the fact that the constituent fibers 3 and 4 are both relatively short, the fineness of the synthetic fibers 3 is relatively low, and the rigidity is low. The shape can be copied relatively faithfully. When the shaping element 34 is a fine one having a height (h) of 1 to 3 mm or a polygon having a sharp ridgeline, the non-woven fabric 31 has a good formability. Is done. The basis weight of the nonwoven fabric 31 is in the range of 10 to 80 g / m ² , and the synthetic fiber 3 is preferably a meltblown fiber.
[0016]
In this manufacturing process, by supplying a slurry composed of relatively short fibers 3 and 4 to the endless belt 13 having an ascending gradient, the orientation of the fibers 3 and 4 in the traveling direction of the belt 13, that is, the machine direction is suppressed. Between the raised portions 51 of the kitchen paper 1A, the fibers 3 and 4 are slightly oriented in the machine direction or distributed in a disorderly manner, so that the kitchen paper 1A is relatively isotropic.
[0017]
By using the prior art, it is possible to process the web supplied from the card machine in the first zone 18 and thereafter in FIG. 3 to form a nonwoven fabric having raised portions. However, since the fiber that can be processed by a conventional card machine has a length exceeding approximately 30 mm, it is not possible to produce the non-woven fabric 1 or 31 having good formability based on the prior art as obtained in the present invention. Have difficulty.
[0018]
【The invention's effect】
The nonwoven fabric according to the present invention is maintained in the sheet form only by the mechanical entanglement of the fibers, that is, the sheet form is not maintained by the bonding of the fibers by binder or heat fusion, and the ridges are also the same. Therefore, it is excellent in flexibility, water absorption and wiping property over the entire region including the raised portion, and is particularly suitable as kitchen paper.
[Brief description of the drawings]
FIG. 1 is a plan view of a nonwoven fabric.
FIG. 2 is a perspective view of kitchen paper.
FIG. 3 is a manufacturing process diagram of a nonwoven fabric.
[Explanation of symbols]
1,31 Nonwoven fabric 3 Thermoplastic synthetic fiber 4 Pulp fiber 51 Raised part

Claims (4)

A non-woven fabric comprising an ultrafine thermoplastic synthetic fiber and having a first side and a second side opposite thereto;
The fiber component which is a 90:10 to 10:90 weight ratio mixture of ultrafine thermoplastic synthetic fiber having a length of 7 to 30 mm and a fineness of 0.1 to 0.8 d and a pulp fiber having a length of 2 to 7 mm is 0. The slurry containing 5 to 20% by weight is fed onto an inclined endless belt and then dehydrated, and the resulting wet sheet has a high pressure applied to the fiber component that is almost uniformly mixed in the wet sheet. It is formed in the form of the nonwoven fabric having a basis weight of 10 to 80 g / m ² by mechanically entanglement with each other under the injection of columnar water flow, and then dehydrating and heating and drying .
The nonwoven fabric in the form is characterized in that a large number of raised portions protruding from the second surface side to the first surface side are arranged at a constant pitch in the vertical and horizontal directions while maintaining the entangled state. The non-woven fabric.   The nonwoven fabric according to claim 1, wherein the thermoplastic synthetic fiber is a meltblown fiber.   The nonwoven fabric according to claim 1 or 2, wherein a height of the raised portion is 0.2 to 5 mm, and a pitch in the vertical and horizontal directions is 1 to 10 mm.   The nonwoven fabric according to any one of claims 1 to 3, wherein the nonwoven fabric is kitchen paper.

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