JPS62225338A - Liquid suction roll for multi-pass - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 from a plurality of objects to be treated or can efficiently absorb liquid from long objects to be treated.

<Prior art> Conventionally, ultra-fine 18
A liquid-absorbing roll is made of a nonwoven mat in which M bundles are three-dimensionally entangled, and a fibrous sheet in which the voids are filled with a polymeric material in a continuous and porous structure is coated and adhered to the roll surface.
For example, it is known from Japanese Utility Model Publication No. 50-10012.

In such a liquid-absorbing roll, the above-mentioned fibrous sheet is wound 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 a liquid absorbing roll has excellent initial liquid absorbing power, there is a limit to the thickness of the fibrous sheet in a roll wrapped with a single layer of fibrous sheet.
It has the disadvantage that the liquid absorption capacity decreases significantly after using it for a while. In addition, to prevent this, a liquid absorbing roll in which a fibrous sheet is wrapped multiple times around the roll surface has been considered, but although this improves the sustainability of liquid absorbing power to some extent, it is said that the morphological stability is significantly inferior. It has drawbacks,
If an adhesive is applied between the wrapped fibrous sheets in order to prevent this, the problem is that it will impede the movement of the liquid, making it impossible to expect an improvement in the sustainability of the liquid absorption power. .

In the case of such a liquid absorbing roll, the ends of the rolled fiber sheet are fixed with adhesive, but the density and hardness of this part are different from the part of the roll, which causes uneven squeezing. Also, since there is a manufacturing limit to the width of the fibrous sheet,
It is difficult to make a wide liquid absorbing roll in the above conventional example.

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 an elastic polymer. This is a multi-pass liquid absorbing roll which is made up of a large number of stacked rolls, and disk-shaped 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.
Obtained by wet coagulation. 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 Alternatively, 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 results in the so-called capillary effect, which gives the roll of the present invention excellent liquid absorption ability.Also, by superimposing the disc-shaped fibrous sheets to form a roll, the above-mentioned extremely This is preferable because no discontinuation points occur in the narrow continuous gap, and the gear pillar effect is maximized.

In the present invention, liquid-impermeable sheets include materials impermeable to liquids such as rubber and plastics, as well as paper, fibers, and other materials.
Even if the material is permeable to liquids, such as cloth, it can be used as long as it is made substantially impermeable to liquids by inserting plastic, film, etc., impregnating it with polymer resin, coating, etc.

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 using the drawings, FIG. 1 shows a section 1 in which disk-shaped fibrous sheets are overlapped, and a disk-shaped section 2 of a liquid-impermeable sheet inserted between the sections. This is a multi-pass liquid absorption roll, and when this is used, for example, as shown in FIG. 2, the object to be treated 3 is wound spirally to perform liquid absorption treatment. Further, as shown in FIG. 3, a plurality of objects 3 to be treated can be arranged in parallel and subjected to liquid absorption treatment at once. In these cases, it is preferable to process the rollers in pairs with the same or other rolls 4, as this further improves the liquid absorption effect.

The liquid-absorbing roll of the present invention cuts the fibrous sheet and liquid-impermeable sheet into disk-shaped objects of desired size, and
These can be manufactured by stacking a large number of fibrous sheets and inserting liquid-impermeable sheets at appropriate intervals to form a roll. When forming into a roll, usually a large number of the above disc-shaped 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 another 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-mentioned disk-like 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 can be easily made into a wider roll by increasing the number of superimposed disc-like materials,
In addition, the morphological stability is extremely good, and if the roll surface is damaged due to long-term use, it is easy to make the roll surface good again by scraping the surface.

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 Reproduction by grinding is also impossible.

The rolls of the present invention have liquid-impermeable sheets inserted at appropriate intervals between the rolls, so liquid movement is blocked at these parts, so even one roll or a pair of rolls can have such excellent properties. Due to its liquid absorption properties, it is possible to simultaneously treat a large number of objects to be treated, or to efficiently absorb liquid by winding long objects in a spiral manner.

<Example and Comparative Example> Nonwoven fabric in which polyester ultrafine fibers are three-dimensionally entangled (7)
A fibrous sheet (thickness 2 mm) made by filling the void with polyurethane in a porous structure and a T/C fabric (thickness 0
．． The polyurethane was coagulated to a thickness of 36 mm and then dry solidified to obtain a liquid-impermeable sheet. Each has an outer diameter of 300 mm and an inner diameter of 1
It was processed into a 50 mm disk shape, and 5 liquid-impermeable sheets were inserted into the 140th and 280th sheets of the 420 fibrous sheets on a metal shaft and overlapped to form a 50 km cm.
A pressure of 2 was applied to fix the roller end, and then the roller surface was ground to center and smooth the surface, thereby producing a roll.

As a comparative example, a liquid-impermeable sheet was inserted and a rubber roll and a liquid-absorbing roll formed only from a fibrous sheet that does not get too hot were used to dehydrate a rope-like fine knitted material immersed in water.The results are shown in the table below. It was shown to.

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 fabric, it was confirmed that wrinkles were generated and damage occurred when treated with a rubber roll under a roll linear pressure of 6 kMCm. The liquid absorbent roll formed only from the quality sheet could be dehydrated without any wrinkles and no problems.

<Effects of the Invention> The roll of the present invention has excellent liquid absorption power and long-lasting liquid absorption ability, and can perform uniform squeezing without damaging the objects to be processed, and can roughly squeeze multiple objects or long objects at the same time. It is possible to perform dewatering treatment. Therefore, it can be used very effectively for removing water and processing liquids that are attached to or contained in the surfaces of industrial products such as metals, plastic products, and textile products. Further, even in products that are prone to wrinkles, the use of the roll of the present invention has the effect of significantly reducing the occurrence of wrinkles.

[Brief explanation of drawings]

It is a schematic diagram. 1. Part 2 where the $ii Textile Sheet is superimposed, Liquid Impermeable Sheet 3, Workpiece 4, Roll

Claims (1)

[Claims] A roll consisting of a large number of disk-shaped fibrous sheets filled with a polymeric elastic material in the voids of a nonwoven fabric in which fibers are three-dimensionally entangled. A multi-pass liquid absorbing roll with a disc-shaped transparent sheet inserted.