JPH0449032B2 - - Google Patents

Description

[Detailed description of the invention]

<Industrial Application Field> The present invention relates to a multi-pass liquid suction roll that can simultaneously absorb liquid on a plurality of objects to be treated or that can efficiently absorb liquid on long objects to be treated. <Prior art> Conventionally, for the purpose of improving liquid absorption,
A non-woven mat made of ultra-fine fiber bundles intertwined three-dimensionally,
For example, in the 1970s, a liquid-absorbing roll was produced by coating the roll surface with a fibrous sheet whose voids were filled with a polymeric substance in a continuous and porous structure.
It is known from the Publication No. 10012. In such a liquid-absorbing roll, the above-mentioned fibrous sheet is wrapped around the roll surface in a single or multiple layers.
This liquid-absorbing roll has superior initial liquid-absorbing power compared to liquid-absorbing rolls made of natural sponge, paper made from natural or synthetic fibers, or ordinary felt wrapped around the roll surface. It has the advantage of not damaging the surface of the object being treated. However, although it is true that such liquid-absorbing rolls have excellent initial liquid-absorbing power, rolls with a single layer of fibrous sheet wrapped around them have a limit to the thickness of the fibrous sheet. The disadvantage is that the power is extremely high. Also,
To prevent this, a liquid absorbing roll with a fibrous sheet wrapped multiple times around the roll surface is considered.
Although this product improves the suction power durability to some extent, it has the disadvantage of significantly inferior form stability.If an adhesive is applied between the wrapped fibrous sheets in order to prevent this, This has a drawback in that the movement of the liquid is hindered, making it impossible to expect an improvement in the durability of the liquid suction power, which is important. Furthermore, in the case of such a liquid-absorbing roll, the ends of the wound fibrous sheet are fixed with an adhesive, but this part has a different density, hardness, etc. from other parts, which causes uneven squeezing. Furthermore, since there is a manufacturing limit to the width of the fibrous sheet, it is difficult to manufacture a wide liquid absorbent roll in the conventional example described above. There is also a demand for efficient absorption of multiple objects to be treated at once or long objects to be treated, but nothing that satisfies this requirement has yet been put into practical use. <Problems to be Solved by the Invention> The present invention can perform liquid absorption treatment on a plurality of objects to be treated at the same time, can efficiently absorb liquid on long objects, and has excellent liquid absorption power and suction power sustainability. The purpose is to provide exceptionally superior rolls. <Means for Solving the Problems> In order to achieve the above object, the present invention provides a disk-shaped fibrous sheet in which the voids of a nonwoven fabric in which fibers are three-dimensionally entangled are filled with a polymeric elastic material. This liquid absorbing roll for multi-pulse is made up of a large number of stacked rolls, and disk-like objects of liquid-impermeable sheets are inserted at appropriate intervals in the width direction of the rolls. In the present invention, the polymer forming the fibers is not particularly limited, but polyester and polyamide are preferred. There are no particular limitations on the polymeric elastomer, but polyurethane elastomer is preferred. In the present invention, a fibrous sheet in which the voids of a nonwoven fabric in which fibers are three-dimensionally entangled are filled with an elastic polymer can be easily obtained by a conventionally known method. For example, a nonwoven fabric is produced from fibers by needle punching, water jetting, direct fabrication, etc., and then impregnated or coated with a polyurethane elastomer solution, dispersion, etc., and dry coagulated. In the case of ultrafine fibers, for example, ultrafine fiber-forming fibers such as polymer arrays, mixed spun fibers, and peelable composite fibers are used as a nonwoven fabric, and then ultrafine fabrication, impregnation with polyurethane elastomer, and wet coagulation are carried out in an appropriate order. It is obtained by Furthermore, a knitted fabric may be inserted between two nonwoven fabrics. It can also be obtained by producing ultrafine fibers in advance to form a nonwoven fabric, impregnating or coating with polyurethane, and performing wet coagulation in an appropriate order. If the fibers are ultrafine, the fibrous sheet has extremely thin continuous voids because it is made of ultrafine fibers and is filled with an elastic polymer having a porous structure. This is the so-called capillary effect, which gives the roll of the present invention excellent liquid absorption power. Also, by superimposing the disc-shaped fibrous sheets to form a roll,
This is preferable because no discontinuation points occur in the extremely thin continuous voids in the roll thickness direction, so that the capillary effect is maximized. In the present invention, liquid-impermeable sheets include materials impermeable to liquids such as rubber and plastic, as well as
Materials that are permeable to liquids, such as paper, fibers, and fabrics, can be used as long as they are made substantially impervious to liquids by inserting plastic, film, etc., impregnating them with polymeric resin, or coating them. The insertion ratio of the liquid-impermeable sheet may be appropriately set depending on the intended number of passes, the number of objects to be processed, etc. To explain the embodiment of the present invention with the drawings, FIG.
This is a multi-pass liquid absorbing roll consisting of a disk-like material 2 of a liquid-impermeable sheet inserted between each part of the roll. Wrap it in a shape to absorb liquid. In addition, as shown in FIG.
It is also possible to perform liquid absorption treatment by arranging them in parallel. In these cases, it is preferable to process it together with the same or other rolls 4 because the liquid absorption effect is further improved. The liquid-absorbing roll of the present invention is produced by cutting the fibrous sheet and the liquid-impermeable sheet into disk-shaped objects of a desired size, and placing the liquid-impermeable sheets at appropriate intervals in a large number of stacked fibrous sheets. It can be manufactured by inserting a sheet and forming it into a roll. When forming into a roll, usually a large number of the above-mentioned disc-like materials are stacked one on top of the other and then pressed in the stacking direction. This results in a tight roll. The roll of the present invention preferably has a shaft made of other material such as metal or plastic at the center of the roll. Preferably, this shaft has a cylindrical shape with holes around the shaft for removing liquid. In the liquid suction roll of the present invention having such a shaft, the liquid suction effect can be improved by reducing the pressure inside the cylindrical shaft. The liquid-absorbing roll of the present invention having a shaft made of another material can be obtained by passing a large number of the above disc-shaped materials through the shaft and pressing them so that they come into close contact with each other. In addition, the roll of the present invention does not necessarily need to secure the ends of the fibrous sheet with adhesive, unlike conventionally known liquid-absorbing rolls in which a fibrous sheet is simply wound around the roll, so the roll surface can be formed uniformly. Is possible. Furthermore, the roll of the present invention is
By increasing the number of superimposed disk-like materials, it is possible to easily make a wide roll, and the roll has extremely good morphological stability, so if the roll surface is damaged due to long-term use, the surface can be scraped. This makes it easy to obtain a good roll surface again. In comparison, in conventional liquid absorbent rolls in which a fibrous sheet is simply wound around a roll, the fibrous sheet repeatedly expands and contracts as the roll rotates, which not only shortens the life of the roll but also Regeneration by grinding is also impossible. The rolls of the present invention have liquid-impermeable sheets inserted between them at appropriate intervals, so liquid movement is blocked at these parts, so even one roll or a pair of rolls can have such excellent liquid absorption properties. A large number of objects to be treated can be treated at the same time, or a long object to be treated can be wound in multiple spirals to efficiently absorb liquid. <Examples and Comparative Examples> A fiber sheet (thickness 2 mm) and a T/C fabric (thickness 0.36 mm) made by filling the voids of a nonwoven fabric in which ultrafine polyester fibers are three-dimensionally intertwined with polyurethane in a porous structure. After coagulating the polyurethane, it was dry solidified to obtain a liquid-impermeable sheet material. Each outer diameter
Punch out a disk shape of 300 mm and inner diameter of 150 mm, and insert 5 liquid-impermeable sheets into the 140th and 280th sheets of 420 fibrous sheets on a metal shaft and overlap them to produce 50 kg/cm ² . Apply pressure to fix the roller end,
Next, the roller surface was polished to center and smooth the surface, and a roll was produced. As a comparative example, we used a liquid-absorbent roll and a rubber roll made only of fibrous sheets without superimposing a liquid-impermeable sheet, and dehydrated a rope-shaped knitted cotton material immersed in water. The results are shown in the table below. Indicated.

[Table] As shown in the table, the liquid absorption roll of the present invention exhibited superior dehydration effects at low roll linear pressures compared to other rolls. Furthermore, when we observed the occurrence of wrinkles in the rope-shaped cotton knitted material, it was confirmed that wrinkles occurred and damage occurred when treated with a rubber roll under a roll linear pressure of 6 kg/cm, but the liquid absorbent roll of the present invention With a liquid absorbent roll formed only from a fibrous sheet, dehydration treatment was possible without wrinkles. <Effects of the Invention> The roll of the present invention has excellent liquid absorption power and long-lasting liquid absorption ability, and is capable of uniform squeezing without damaging the workpiece, and can also squeeze multiple workpieces or long workpieces at the same time. It is possible to perform liquid removal treatment. For this reason, for example, metals, plastic products,
It can be used very effectively to remove water and processing liquids that adhere to or contain the surfaces of industrial products such as textile products. Furthermore, even in products that are prone to wrinkles, the use of the roll of the present invention has the effect that the wrinkles are extremely small.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the roll of the present invention, and FIGS. 2 and 3 are schematic diagrams showing an example of the use of the roll of the present invention. 1... Part where the fibrous sheets are superimposed, 2...
Liquid-impermeable sheet, 3... object to be treated, 4... roll.

Claims (1)

[Claims] 1 A roll in which a large number of disk-shaped fibrous sheets are stacked, each of which has a polymeric elastic material filled in the voids of a nonwoven fabric in which fibers are three-dimensionally entangled, and liquid is applied at appropriate intervals in the width direction of the roll. A multi-pass liquid absorbing roll with a disc-like impermeable sheet inserted.