JPS62225337A - Roll - 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 roll that can be used for a long period of time while maintaining extremely high liquid absorption power and persistence of liquid absorption power.

<Conventional technology> Conventionally, in order to remove liquids such as water and processing solutions that adhere to or are contained on the surfaces of various industrial products, rubber rolls, natural sponges, paper made from natural or synthetic fibers, and A liquid absorbent roll wrapped with ordinary felt is known.

A liquid-absorbing roll made by covering and adhering a fibrous sheet, in which the voids are filled with a polymeric material in a continuous and porous structure, on a non-woven mat in which fibers are intertwined three-dimensionally. is known, for example, from Japanese Utility Model Publication No. 50-10012. In such a liquid-absorbing roll, the above-mentioned fibrous sheet is wrapped around the roll surface in a single or multiple layers.

Such liquid-absorbing rolls have superior initial liquid-absorbing power compared to liquid-absorbing rolls made of natural sponge, paper made from natural or synthetic fibers, ordinary felt, etc. wrapped around the roll surface. Since there is a limit to the thickness of the liquid, it has the disadvantage that its liquid absorption capacity decreases significantly after a while of use. 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 has the disadvantage of significantly inferior morphological stability. However, if adhesive is applied between the wrapped fibrous sheets to prevent this, it will prevent the movement of liquid, making it impossible to expect the most important improvement in the suction power. It has the defect of being put away.

Generally speaking, in such a liquid-absorbing roll, the ends of the wound fibrous sheet are fixed with an adhesive, but the density, hardness, etc. of this part are different 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 make a wide liquid absorbing roll in the conventional example described above.

In order to improve these problems, the present applicant and others have stacked a large number of disc-shaped materials made of fibrous sheets filled with a porous structure of polymeric elastic material into the voids of a nonwoven fabric in which fibers are three-dimensionally entangled. We proposed a liquid absorbing roll (Japanese Patent Application No. 6O-104022).

The liquid absorption roll according to this invention has improved liquid absorption power and durability compared to conventional rolls, but when used for a long time, it becomes clogged, requiring frequent cleaning, and the surface of the roll is damaged. There are problems in that the diameter of the roll becomes smaller and unevenness occurs due to the impact.

<Problems to be Solved by the Invention> As a result of intensive studies by the present inventors to maintain liquid suction power and suction power sustainability (collectively referred to as liquid suction performance) for a long period of time, the present inventors have found that the liquid suction power Moreover, it has been possible to provide a roll that can be used for a long period of time while maintaining extremely high suction power.

<Means and actions for developing problems> i.e.
The present invention comprises a core formed by stacking a large number of disk-shaped fibrous sheets filled with polymeric elastic material in the voids of a nonwoven fabric in which fibers are three-dimensionally entangled, and This roll is composed of an outer layer made of a sheet-like material with good liquid absorption properties.

The core of the roll in the present invention is composed of a fiber sheet, and this woven fabric is a three-dimensional entanglement of fibers.
A nonwoven fabric in which ultrafine fibers are intertwined three-dimensionally is preferable in terms of both the liquid absorption power and the sustainability of the liquid absorption power.

In particular, it is more preferable that the nonwoven fabric is a non-R fabric in which ultrafine fibers are bundled and three-dimensionally intertwined, in terms of both the liquid absorbing power and the sustainability of the liquid absorbing power.

In this case, the capillary effect is further exhibited.

The polymer forming the fibers in the present invention 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 entangled three-dimensionally 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 wet coagulated. In the case of ultrafine fibers, for example, ultrafine fiber-forming fibers such as polymer arrays, mixed spun fibers, exfoliated composite fibers, etc. are made into a nonwoven fabric, and then ultrafine fabrication, impregnation with polyurethane elastomer, and wet coagulation are carried out in an appropriate order. It can be obtained by It can be obtained by inserting a knitted fabric between roughly two non-woven sheets, or by preparing ultrafine fibers in advance to form a non-woven fabric, and impregnating or wet coagulating with polyurethane in an appropriate order.

When 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 there are no discontinuities in the narrow continuous gap, and the capillary effect is maximized.

In the present invention, the sheet-like material to be wrapped around the surface of the core formed by stacking a large number of disk-like fiber sheets is not particularly limited as long as it has liquid absorbing properties, such as felt, sponge fiber, and polymeric elastic material. Although there are composites of fibers and polymeric elastic materials, preferred are composites of fibers and polymeric elastic materials.

In particular, fiber sheets in which the voids of a nonwoven fabric in which fibers are three-dimensionally entangled are filled with a porous structure of polymeric elastic material, and fiber sheets that are the same as those forming the core have good liquid absorption performance. Moreover, it is preferable because the core part and the outer layer part fit well.

The number of times the sheet material of the outer layer is wound is not particularly limited, but it is preferably determined as appropriate depending on the type of object to be treated, the liquid content, the size of the core roll, liquid absorption performance, etc. Further, in order to fully demonstrate the liquid absorption performance of the core, it is preferable to adjust the thickness of the outer layer. For this reason, the number of windings is usually about 3 to 7 times.

Fixing of the sheet-like material in the outer layer portion is not particularly limited, but may be carried out using means such as sewing or adhesive.

However, it is not preferable to apply the adhesive to the entire surface to be bonded, since this will impede the adsorption performance of the core. If the sheet-like material on the outer layer is fixed in such a way that it can be easily attached and detached, when the liquid absorption performance of the roll decreases due to clogging, etc., the outer layer can be easily removed from the roll, and it can be used as a washed or other sheet material. This is preferable because the sheet-like material can be fixed and reused as a high-performance roll.

Since the roll of the present invention has an outer layer made of a sheet-like material, the diameter becomes smaller due to clogging of the core or damage from objects to be processed. Since it is protected from troubles such as unevenness, it is possible to maintain excellent liquid absorption performance over a long period of time while the shape of the core is maintained.

The roll of the present invention consists of a core made of a large number of stacked disk-like fibrous sheets, an outer layer made of sheet-like material wound around the surface of the core, and has a structure in which the core has a shaft inside. It can be used effectively.

The roll of the present invention is produced by cutting such a fibrous sheet into disc-shaped objects of a desired size, stacking a large number of these discs to form a roll shape, and wrapping the sheet-like material around the surface of the core of this roll. It can be manufactured by 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 dense roll core.

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 a hole for removing liquid around the shaft.

In the roll of the present invention having such a shaft, the liquid absorption effect can be improved by reducing the pressure inside the cylindrical shaft.

The roll of the present invention having a shaft made of another material can be obtained by passing a large number of the above disk-shaped materials through the shaft and pressing them so that they come into close contact with each other.

<Example> A fibrous sheet (thickness 2 mm) made by filling the voids of a non-woven fabric made of ultrafine polyester fibers with polyurethane in a porous structure was pounded into a disk shape with an outer diameter of 245 mm and an inner diameter of 200 mm, and was placed on a metal shaft. 60 sheets superimposed, 50k
A pressure of g/cm2 was applied to fix the roller end.

On this day, after polishing the surface, centering and smoothing the surface,
The fibrous sheet was wound twice to produce a liquid absorbent roll.

As a comparative example, a pair of liquid absorbent rolls formed only by overlapping fibrous sheets and a pair of nonwoven fabric rolls made of ordinary fibers were prepared.
During this time, dehydration treatment was performed through an acrylic blanket and a water-containing wool fabric, and the results are shown in the table below in terms of moisture content (%).

(1) Measurement conditions: cloth speed 20+n/min, roll linear pressure
3 kmcm Number of squeezes: 1 time (2) Moisture content (%) - (W2-Wl) Wl; Weight of the object to be treated when drying W2; Weight after being immersed in water and dehydrated As shown in the table, the roll of the present invention Compared to a liquid-absorbing roll formed only by superimposing fibrous sheets, the liquid-absorbing property did not decrease, and it exhibited a superior dewatering effect compared to a non-woven fabric roll made of ordinary fibers.

When the liquid absorbent roll of the present invention was used for surface dehydration treatment, it was observed that mud, etc. had adhered to the roll surface, but the fibrous sheet wrapped around it was removed and washed with water. The core was wound again to obtain a roll. This roll exhibited almost the same liquid absorption performance as the original roll.

<Effects of the Invention> Since the roll of the present invention has a sheet-like material with good liquid absorption properties wrapped around the surface layer, it can be used without impairing the excellent liquid absorption power and sustainability of the liquid absorption power of the core part. It absorbs problems such as clogging and damage that tend to occur with core-only rolls, and can be easily removed and regenerated, allowing the rolls to be used for long periods of time with high performance.

The roll of the present invention can be used very effectively for removing liquids such as water and processing liquids adhering to or contained in the surfaces of various industrial products.

Claims (1)

[Claims] A core formed by stacking a number of disc-shaped fibrous sheets filled with polymeric elastic material in the voids of a nonwoven fabric made of three-dimensionally entangled fibers, and a liquid absorbent wound around the surface of the core. A roll consisting of an outer layer made of a sheet-like material with good properties.