JPH08159658A - Liquid absorbing roll - Google Patents

Abstract

PURPOSE: To provide a liquid absorbing roll which is constituted to have excellent liquid absorption ability for liquid and facilitate processing of contamination by liquid. CONSTITUTION: In a liquid absorbing roll consisting of a roll shaft 11 and a liquid absorbing member 12 at the periphery thereof, liquid absorption ability is further improved by the liquid absorbing roll having the liquid absorbing member formed of non-woven cloth formed of very fine fibers on which confounding processing is applied, the roll shaft 11, having fine holes formed in the surface of the roll shaft 11 and axial through-holes coupled to the fine holes, and through connection of a pressure reduction absorbing means to the roll shaft 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-absorbing roll, and more particularly to a liquid-absorbing roll which excels in liquid-absorbing property and can easily treat contamination by the liquid.

[0002]

2. Description of the Related Art Liquid absorbing rolls are liquids such as water and treatment liquids that are attached to or contained in the surface, irregularities, or holes of a substrate such as metal, plastic, glass, wood board, fiber products, rubber products, etc. Is used for the removal of

Liquid absorbing rolls generally have a structure in which a liquid absorbing member is provided around the roll shaft. As the liquid absorbing member, a synthetic resin foam, a natural sponge, a felt or the like has been used. These were very excellent in liquid retention, but in continuous use and high-speed use, the durability was insufficient, so the liquid absorbing member or liquid absorbing roll had to be frequently replaced. This has led to a reduction in the efficiency of the production process using liquid absorbing rolls.

A liquid absorbing roll using a non-woven fabric is used as a material which improves the durability of the liquid absorbing member and has excellent liquid absorbing and liquid retaining properties. In this liquid absorbing roll, the nonwoven fabric is wound around the roll shaft in a single layer or multiple layers, and the interface between the roll shaft and the nonwoven fabric and the winding end portion of the nonwoven fabric are generally fixed with an adhesive or the like. Since liquid absorption and liquid retention may not last for a long time with a single layer, a multiple winding structure is mainly used to increase the thickness of the liquid retention member.

In the multiple winding structure, a difference in the number of windings occurs at the winding start portion and the winding end portion, so that the liquid absorbing property changes before and after that, and stable and uniform liquid absorption cannot be performed. This step can be eliminated by reducing the thickness of the non-woven fabric, but since the strength of the non-woven fabric is reduced, tears, fluffs, stretching, etc. are seen during use, and the liquid-absorbing roll is used for a long time. It had the drawback of not being able to withstand.

In order to impart strength to the non-woven fabric, as described in Japanese Utility Model Publication No. Sho 50-10012, a lotus root-like porous fiber or a non-woven mat in which three-dimensionally entangled microfiber bundles are entangled. It has been necessary to use a non-woven fabric that has been subjected to a special process, such as a fibrous sheet in which voids are continuously filled with a polymeric substance in a porous structure. Special processing of such non-woven fabric is not only troublesome, but the liquid to be absorbed can be various types such as water, acidic aqueous solution, basic aqueous solution, organic solvent, etc., so select a polymer substance that suits the liquid property. In addition, there is a problem in that the fibers that can be used are limited due to the interaction with the fibers constituting the nonwoven fabric and the influence of the solvent used when filling the polymer substance.

The liquid-retaining property and the liquid-absorbing property of the non-woven fabric are largely due to the conditions such as the size of fine pores formed by the fibers and the directionality. In the case of a non-woven fabric filled with a polymer substance as described above or a conventional non-treated non-woven fabric, it is difficult to control the above conditions, and the absorbed liquid is absorbed from the outer periphery of the liquid absorbing member. It did not easily penetrate toward the center of the liquid roll. Therefore, although it has better liquid absorbability than the above-mentioned natural sponge, felt, etc., depending on the conditions such as the shape and material of the substrate to be liquid-absorbed, the type of liquid, the viscosity, the amount, etc. There were things I couldn't do.

[0008]

The present invention provides a liquid-absorbing roll having stable liquid-absorbing property, liquid-retaining property and strength capable of withstanding high-speed operation for a long time.

[0009]

Means for Solving the Problems The inventors of the present invention have made extensive studies to solve the above problems, and as a result, a first aspect of the present invention is a liquid absorbing roll comprising a roll shaft and a liquid absorbing member around the roll shaft. It has been found that the member may be made of a non-woven fabric made of ultrafine fibers subjected to hydroentanglement treatment. Further, as a second invention, the roll shaft may have pores on the surface of the roll shaft and a permeation hole in the axial direction connected to the pores, and a vacuum suction means may be connected to the roll shaft. I found it.

[0010]

The liquid absorbing roll of the present invention comprises a roll shaft and a liquid absorbing member provided around the roll shaft. As the liquid absorbing member, a non-woven fabric made of ultrafine fibers subjected to hydroentangling treatment (hereinafter abbreviated as hydroentangled non-woven fabric) is used.

Since the nonwoven fabric, which is the liquid absorbing member used in the liquid absorbing roll of the present invention, has been subjected to hydroentangling treatment, fibers can be three-dimensionally formed without special processing using a polymer substance. Because it is fully entangled, it has much better strength than conventional nonwoven fabrics. Therefore, since the nonwoven fabric can be made thin, no level difference is generated when the nonwoven fabric is wound around the roll shaft, and a constant liquid absorbing property can be maintained over the entire surface of the substrate. In addition, since the fibers are entangled very strongly, defects such as fluffing do not occur, and the substrate is not contaminated with fibers or the like peeled from the nonwoven fabric.

The hydroentangled nonwoven fabric has a large number of through holes or non-through holes in the thickness direction. When the hydroentanglement-treated nonwoven fabric is wound around the roll shaft, fine pores are continuously present from the outer surface of the liquid absorbing member which is the outer periphery of the liquid absorbing roll toward the center of the liquid absorbing roll. The liquid absorption speed is greatly improved, and high-speed operation becomes possible.

FIG. 3 is a schematic view showing a liquid absorbing state using a liquid absorbing roll using the nonwoven fabric subjected to the hydroentangling treatment of the present invention. When the liquid absorption rolls 13 wound with the non-woven fabric subjected to the hydroentangling treatment are installed on the upper and lower sides, and the base 21 passes between them to absorb the liquid existing on the surface, the irregularities 22 and the holes 23, The nip pressure applied to the liquid absorbing roll pair near the center line of the liquid roll pair (FIG. 3 (a)) causes some of the fibers to penetrate into the pores and inside the unevenness, and the nip pressure on the downstream side of the center line relaxes. The liquid inside will be completely sucked out at the part where it was made. The liquid absorbed by the liquid-absorbent roll pair is squeezed backward from the hydroentangled nonwoven fabric when the substrate and the liquid-absorbent roll are pressed against each other on the upstream side of the center line, and the liquid-absorbent property of the liquid-absorbent roll is recovered for a long time. Liquid can be stably absorbed.

Further, since the roll shaft surface has pores and axial permeation holes connected to the pores, it is possible to install a vacuum suction means on the roll shaft, which is quicker and more powerful. Liquid absorption treatment can be performed.

Since the liquid-absorbent roll of the present invention has a structure in which a non-woven fabric having a hydroentanglement treatment is wound around the roll shaft, replacement of the non-woven fabric when it is deteriorated is very easy.

The hydroentangled nonwoven fabric according to the present invention will be described in detail. The fiber diameter of the hydroentangled nonwoven fabric according to the present invention is 1 to
It is 30 μm, and more preferably 2 to 20 μm. If the fiber diameter is smaller than 1 μm, the non-woven fabric becomes too dense, the porosity decreases, and the liquid retention capacity decreases. Conversely 30
If it becomes larger than μm, the porosity increases, but
The specific surface area decreases, and the liquid absorbing ability due to the capillary action decreases. The fiber length is 1 to 50 mm. Fiber length is 50
Those having a diameter of more than mm are not preferable because the fibers are entangled during the dispersion of the fibers at the time of forming the web described later. further,
3 considering the uniformity of the hydroentangled nonwoven fabric and the strength after the entanglement
A range of up to 30 mm is preferred.

The fibers used are preferably those having resistance to the liquid used in the apparatus in which the liquid absorbing roll is installed, such as polyester type, polyolefin type, polyvinyl chloride type, polyacrylonitrile type, polyvinyl alcohol type, In addition to polyamide, regenerated fiber, semi-synthetic fiber, natural fiber and the like are preferable. Further, two or more kinds of these fibers may be mixed and used. The cross-sectional shape of the fiber is not particularly limited, and it is circular, oval, triangular, star-shaped, T-shaped, Y-shaped, U-shaped,
It may have an atypical cross-sectional shape such as a leaf shape. It is preferable to use fibers having a cross section other than a circular shape because the porosity and the specific surface area of the non-woven fabric 15 which affect the liquid absorption efficiency of the liquid absorbing roll are improved. Further, those having voids on the surface or those having a branched structure are preferable. You may use it. Depending on the case, the fibers may be subjected to hydrophilic treatment or lipophilic treatment.

In the method for producing a hydroentangled nonwoven fabric according to the present invention, a web is first formed, and then the web is placed on a support for three-dimensional entanglement treatment. As a method for forming the web, a card method, an air lay method, a spun bond method, a melt blow method, a wet papermaking method, or the like can be used. However, when good formation and uniformity are required, the web is formed by wet papermaking. It is necessary to use.

A web may be manufactured by combining the above-mentioned forming methods. It is also possible to use a web using a fiber or a forming method other than the above as long as the performance of the hydroentangled nonwoven fabric is not impaired.

The web obtained by the above method is placed in a single layer or multiple layers on a support and subjected to mechanical entanglement treatment.
Examples of the mechanical entanglement treatment include a needle punch method, a stitch method, a felt method, a water entanglement method, and the like. However, since the entanglement is uniformly performed and the production rate is high, the water absorption roll of the present invention has a water flow. It is preferable to use a non-woven fabric entangled by the entanglement method. In the hydroentanglement method, a waterflow is jetted from above the web to three-dimensionally entangle the fibers forming the web. This entanglement can be performed on both sides or one side.

The nozzle for jetting the water flow is 10 to 500 μm.
Any diameter within the range of m can be used. The nozzle interval is set to 10 to 1500 μm. Moreover, the shape of the nozzle is circular and a columnar water stream is jetted. The support for loading the web employs a porous material of 50-200 mesh.

The water pressure is set within the range of 10 to 250 kg / cm ² , more preferably 50 to 250 kg / cm ² , and the processing speed is set to 5 to 200 m / s at appropriate times.

In order to improve the surface quality of the hydroentangled nonwoven fabric, water pressure is gradually applied from the initial stage to the final stage, or
The nozzle diameter and / or the nozzle interval is gradually reduced. Also, depending on the case, rotating the header of the nozzle,
A wire is inserted between the nozzle and the web, and the wire is further vibrated to the left or right, or a fan-shaped water flow is used to improve the surface quality.

[0024]

EXAMPLES The present invention will be described with reference to illustrated examples, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded.

FIG. 1 is a schematic view of the liquid absorbing roll of the present invention. The liquid-absorbent roll of the present invention comprises a roll shaft 11 and a liquid-absorbent member 12 which is a non-woven fabric composed of ultrafine fibers subjected to hydroentangling treatment around the roll shaft 11.

1% of 100 parts by weight of polypropylene fiber having 0.1 denier (fiber diameter 3.5 μm) and fiber length 10 mm
After impregnating in a nonionic surfactant solution, stirring with an agitator, followed by high molecular weight acrylamide 0.1
% Solution was used to perform papermaking on a tilted short-net paper machine to form a web having a basis weight (dry weight) of 25 g / m ² .

Two layers of this web were laminated on a stainless steel 100 mesh support, and both surfaces were subjected to entanglement treatment with a columnar water flow using five nozzle heads having the conditions shown in Table 1. The entanglement speed is 20 m / min. Then, after confounding, it is dried at 130 ° C with a suction drum dryer,
A hydroentangled nonwoven was formed.

[0028]

[Table 1]

Nozzle head No. 5 in Table 1 used a thin water flow at low pressure for surface adjustment. By using such a water flow, the water flow trace can be eliminated or mitigated.

The non-woven fabric (80 cm) obtained was wound around a stainless steel roll shaft 11 to form a liquid absorbing roll I, and a squeezing device in which two liquid absorbing rolls were incorporated in a pair of aluminum plates (A4 size) Size, thickness 0.3m
m) and a 1.6 mm-thick copper clad laminate for printed wiring boards (A4 size) having 500 holes of 0.5 mmφ immersed in water, a nip pressure of 5 kg / cm ² was applied to the liquid absorbing roll pair. To 20 m / min. The solution was squeezed under the conditions.

A sponge roll II (manufactured by Kinyosha Co., Ltd.) in which sponge-like nitrile butyl rubber is wound as a liquid absorbing member around a roll shaft having the same design as that used above.
Then, the roll liquid was similarly subjected to the squeezing treatment by using the roll shaft III around which a non-woven fabric (web) which has not been subjected to the hydroentangling treatment is wound as the non-woven fabric.

The number of liquid-absorbing roll pairs required until the amount of water on the surface of the aluminum plate reaches 10%, water remaining in all the holes of the copper clad laminate and water adhering to the surface are removed. Table 2 shows the number of liquid-absorbing roll pairs required to achieve this.

[0033]

[Table 2]

The liquid-absorbent roll I using a hydroentangled nonwoven fabric as the liquid-absorbent member of the present invention removes water very quickly compared to other liquid-absorbent rolls on both an aluminum plate and a copper clad laminate. I was able to. With the sponge roll II, the holes of the copper-clad laminate were blocked by the liquid absorbing roll pair from above and below, so that the water in the holes could not be removed only by the liquid absorbing roll.

When the absorbent roll III was used for 100 hours, it was confirmed that the aluminum plate and the copper clad laminate were contaminated due to the fraying of the fibers forming the nonwoven fabric, but the absorbent roll I of the present invention was used for 300 hours. As described above, the squeezing treatment could be stably performed without such defects.

Further, the pores 14 are formed on the surface as shown in FIG.
And a vacuum suction means is connected to a liquid absorbing roll IV in which a hydroentangled non-woven fabric is wound around a stainless steel roll shaft having a permeation hole 15 in the axial direction connected to the fine pores 14 and the same set as the liquid absorbing roll I. The aluminum plate and the copper clad laminate were subjected to a squeezing treatment at a speed of 50 m / min. Could be up to.

[0037]

As described above, the use of the liquid absorbing roll using the nonwoven fabric composed of the ultrafine fibers subjected to the hydroentangling treatment of the present invention as the liquid absorbing member has a very excellent liquid absorbing property. Therefore, the squeezing process can be performed at a higher speed than the conventional liquid absorbing member. Also, because its strength is strong,
Defects such as tearing and fraying are unlikely to occur, and stable liquid absorption and liquid retention can be maintained for a long period of time. Further, the roll shaft has pores on the surface and a permeation hole in the axial direction connected to the pores, and by performing a squeezing process by connecting a vacuum suction means to the roll shaft, high speed and long time Can be operated.

[Brief description of drawings]

FIG. 1 is a schematic view of a liquid absorbing roll of the present invention.

FIG. 2 (a) of a roll shaft relating to the liquid absorbing roll of the present invention
Schematic drawing, and (b) schematic sectional view

FIG. 3 is a schematic view showing a liquid absorbing state using the liquid absorbing roll of the present invention.

[Explanation of symbols]

 11 Roll Shaft 12 Liquid Absorbing Member (Hydroentangled Nonwoven Fabric) 13 Liquid Absorbing Roll 14 Pore 15 Permeation Hole 21 Substrate 22 Concavo-convex 23 on Gas Surface 23 Hole

Claims (2)

[Claims] 1. A liquid-absorbing roll comprising a roll shaft and a liquid-absorbing member around the roll shaft, wherein the liquid-absorbing member is composed of a nonwoven fabric made of ultrafine fibers subjected to hydroentangling treatment. . 2. The liquid absorbent according to claim 1, wherein the roll shaft has pores on the surface of the roll shaft and permeation holes in the axial direction connected to the pores, and a vacuum suction means can be connected to the roll shaft. roll.