JPH0830313B2 - Dehydrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to the manufacturing and processing steps of fiber or paper.
The present invention relates to a dehydrator that removes water from a water-containing sheet.

[Prior art] Water jet, non-woven fabric manufacturing by wet papermaking,
In the production and processing of fibers such as dyeing and washing of woven and non-woven fabrics, it is necessary to dehydrate the fibers containing a large amount of water. Also, in the papermaking process of the paper manufacturing industry, dehydration is required after rinsing the paper. As described above, dehydration work for removing water from a sheet-like material is performed in various fields including the textile industry and the paper manufacturing industry.

In this case, it is desired to remove water at a high dehydration rate from the viewpoint of speeding up the production line or reducing the fuel cost when drying the product.

For this reason, various dehydrating apparatuses such as those shown below have been conventionally proposed. That is, two rolls formed by tightening a large number of flanges with a narrow gap are provided, a sheet-like material is squeezed between the rolls to dehydrate, and a vacuum device is used to vacuum suction from the gap (JP-A-55-1316). ， The same 55-3044
No. 5). Dewatering device using rolls formed by stacking a number of non-woven fabrics between flanges in a crimped shape (Japanese Patent Publication No. 36502).
A sheet assembly in which a resin or the like is formed on the surface of a porous material such as a woven fabric, and small holes are formed in the resin foil with a laser or the like (JP-A-57-66193). A dewatering device provided with a pair of rolls having slits or small holes distributed through the inner vacuum through holes distributed elastically pressed on the entire outer peripheral surface (JP-A-55-6).
No. 6398).

[Problems to be Solved] The above-described conventional dehydrator can dehydrate from the surface of a roll that can be vacuum-sucked through small holes, slits, and the like, and has no significant problem in terms of dehydration efficiency.

However, in these dewatering devices, there is a problem that the shape of the dewatering small holes and slits provided in the roll is transferred to the product at the time of squeezing, which deteriorates the surface characteristics of the product, that is, smoothness and glossiness. . In particular, there is no practical one for dehydrating relatively thin products, and the advent of a new dehydrator is desired.

Further, it is technically difficult to form a minute hole so as not to cause transfer, and although it is partially performed by laser processing or the like, the manufacturing cost becomes very high, and its use range is limited. There was a problem that it was significantly limited.

The present invention has been made in view of the above problems,
An object of the present invention is to provide a dewatering device capable of efficiently dewatering sheet-like materials such as thin fibers and paper without deteriorating the smoothness and glossiness of the product.

[Means for Solving the Problems] In order to achieve the above object, the dehydrating apparatus of the present invention, in which a hydrous sheet-like material is pressed against the surface of a porous dehydrating body to dehydrate, the dehydrating body is provided with a large number of fine vent holes. It is composed of a cast body.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a dehydrator using an electroformed plate for only one of the pair of rolls. In FIG. 1, 10 and 20 are dewatering rolls (dehydrating bodies) that form the main part of the dewatering device, and are arranged facing each other vertically. At least one of the dewatering rolls 10 and 20 is rotated in a direction of feeding the water-containing sheet material between the rolls 10 and 20.
Further, these dewatering rolls 10 and 20 are pressed by at least one of them with an appropriate pressure so that the squeezing force of the water-containing sheet material fed between the rolls can be adjusted according to the thickness, the material, the water content, etc. I am doing it. Well-known drive means can be used as the means for rotating the roll and pressing the roll.

Of the pair of dewatering rolls 10 and 20, the upper dewatering roll 1
An ordinary roll is used for 0, and an electroformed roll is used for the lower dewatering roll 20.

The lower dewatering roll 20 is a roll body as shown in FIG.
21, a water passage plate 22 formed on the outer periphery of the roll body 21,
And a surface member 23 that comes into contact with the water-containing sheet-like material formed on the outer periphery of the water passage plate 22. Of these, the main drain hole 211 is provided in the center of the roll body 21, and
A plurality of drain holes 212 are arranged in the radial direction around the main drain hole 211.
Has been drilled. Further, a drain groove 213 communicating with the drain hole 212 is provided on the outer periphery of the roll body 21.

A ring-shaped water passage plate 22 provided around the outer circumference of the roll body 21.
Has a large number of drain holes 221 penetrating in the radial direction.
The water passage plate 22 is formed almost integrally with the surface member 23, and functions as an inner layer material that supports the surface member 23.

The surface member 23 has a number of fine water passage holes 231 and a thickness of 0.5.
An electroformed plate (body) of about 10 mm is formed into a ring shape (including a curved shape joined to form a ring shape).
The contact surface of this electroformed plate, that is, the surface excluding the fine water holes 231 has a surface roughness of 2S or less, preferably 1S or less, and more preferably 0.8S or less. By doing so, a product having excellent smoothness, transparency, and gloss can be obtained.

The size of the fine water passage holes 231 is usually 10 to 500μ, preferably 20 to 300μ, more preferably 30 to 200μ, and the number of fine water passage holes is usually 5 to 500 pieces / cm ² , if necessary. Depending on 50 ~
It is preferably about 100 pieces / cm ² . By doing so, it is possible to prevent transfer of the water passage holes and enhance the dehydration efficiency.

The surface roughness, the size of the fine water passage holes 231, and the perforation density described above are taken into consideration in consideration of the conditions such as the prevention of the transfer of the holes to the sheet-like melt and the type and thickness of the sheet-like article to be dehydrated. It is desirable to select from the above range.

A method for manufacturing an electroformed plate having such fine water passage holes,
A known method can be used (for example, JP-A-60-152).
No. 692, No. 61-253392). All of these known methods are intended to form a molding die, and are formed by an electroforming method (which is called plating in a broad sense in the present invention).
Although molds of various complicated shapes have been obtained, the present invention is different in that a ring-shaped or curved shape is obtained.

Here, an example of the procedure for forming such an electroformed plate is schematically shown as follows.

That is, a ring-shaped or curved base material such as glass, a resin-coated polished metal plate, or an epoxy resin is prepared (FIG. 3 (a)), and a metal having good conductivity is attached to the glossy surface (mirror surface) of the base material. Then, apply a mixture of materials with poor conductivity in a certain ratio. For example, spray a mixture of paste silver lacquer, butyl acetate, vinyl chloride lacquer onto the substrate
Substrate treatment is performed by forming a layer of a few tens of μ and drying it. Here, by changing the compounding amount of the vinyl chloride lacquer, the conductivity of the surface of the base material can be freely set, and as a result, the size and number of the fine water passage holes can be freely controlled.

Next, the plating material is electrolyzed together with the plating material such as nickel, chromium, iron, copper in a plating solution tank to form a plating layer having a large number of fine water passage holes (FIG. 3 (b)). In this case, a surfactant is not added to the plating solution to facilitate the formation of water passage holes. In addition, the diameter of the water passage hole increases with the progress of plating, which is excellent in terms of water passage and surface gloss. In the present invention, the thickness of the plated surface is usually about 0.5 to 10 mm.

After that, the plated layer is easily separated from the base material via the spray layer to form a ring-shaped or curved electroformed plate. (FIG. 3 (c)).

Nickel is preferably used as the plating material. This makes it possible to obtain an electroformed plate having a smooth surface, a glossy surface, and a large number of fine water passage holes. The electroformed plate thus obtained may be used as it is,
Further, it may be used after polishing the surface to make it a mirror surface.

Thus, the porous dehydrated body using the electroformed plate can be easily and inexpensively manufactured, and has excellent durability.

If a suction device is connected to the main drain hole 211 of the roll body 21 and the water is forcibly dehydrated from the fine ventilation holes 231 of the surface member 23, the dehydration efficiency can be further enhanced.

According to the dewatering device having such a configuration, the water-containing sheet-like material sent between the rolls is used as the upper and lower dewatering rollers 10 and 2.
It is squeezed and dehydrated as if it is sandwiched by 0,
The water is forcibly sucked and dehydrated from the surface of the lower dewatering roller 20 through the fine water passage holes 211. As a result, the water-containing sheet material such as fiber or paper can be efficiently dehydrated without deteriorating the surface characteristics of the product.

FIG. 4 shows a second embodiment of a dewatering device in which a surface member 23 made of an electroformed plate is attached to both the upper and lower dewatering rolls 20,20. According to the dehydrator of this embodiment, it is possible to perform forced dehydration from the upper and lower dehydration rolls 10 and 20 simultaneously with the pressing dehydration,
More efficient dehydration is possible.

Fig. 5 shows auxiliary dewatering rolls 31,3 around the main dewatering roll 20.
A dehydrator according to a third embodiment, in which a plurality of 2,33,34 are arranged, and an electroformed plate is used as the surface member 23 only for the main dewatering roll 20. According to the dewatering apparatus of this embodiment, the pressing dewatering can be performed over several stages, and the dewatering can be forcibly performed from the surface of the main dewatering roll 30 while it is in contact with the main dewatering roll 30.

Also, in the case of FIG. 5, auxiliary dewatering rolls 31,34
You can also hang an endless belt with no breathability between them.
With this, the dewatering efficiency when the pressure on the main dewatering roll side is reduced is significantly improved.

The present invention is not limited to the above embodiment, and includes, for example, the following modifications.

A dehydrator having a form other than rolls, for example, a conveyor-like or plate-like dehydrator, and a dehydrator comprising a combination of these and roll-like ones.

A dewatering device in which a dewatering body, for example, a dewatering roll is arranged in a mode other than the vertical direction and the circumferential direction (for example, horizontal direction, vertical direction).

 A dehydrator consisting of a single dehydrator.

A dehydrator using a dehydrator in which the water passage plate is removed and the surface member is directly attached to the roll body.

A dehydrator that does not connect a suction device to the main drainage hole of the dehydrator and allows natural drainage from the fine water passage hole.

A dehydrator that does not have the function of adjusting the pressing force according to the thickness, material, water content, etc. of the water-containing sheet.

The dewatering device of the present invention described above includes woven and non-woven fibers,
It can be used for dehydration of papers and many water-containing sheets, and also for dehydration of thin products.

[Effects of the Invention] As described above, according to the present invention, dehydration of a water-containing sheet-like product can be performed without being limited by the thickness, type, etc. of the product and without impairing surface properties such as smoothness and gloss. It can be done efficiently.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an apparatus according to a first embodiment of the present invention, FIG. 2 is an enlarged sectional view of an essential part of FIG. 1, and FIGS. 3 (a) to (c) are explanations when forming an electroformed body. FIG. 4 is a schematic configuration diagram of the second embodiment device, and FIG. 5 is a schematic configuration diagram of the third embodiment device. 20: Dewatering roll, 21: Roll body 211: Main drainage hole, 212: Drainage hole 22: Water passage plate, 221: Drainage hole 23: Surface member, 231: Fine water passage hole

Claims (3)

[Claims] 1. A device for dehydrating a hydrous sheet-like material by press-contacting the surface of a porous dehydrated body, wherein the porous dehydrated body is
A dehydrator comprising an electroformed body having a large number of fine ventilation holes. 2. The dehydrator according to claim 1, wherein the electroformed body has a mirror surface. 3. The dehydrator according to claim 1 or 2, wherein the fine vent holes of the electroformed body are connected to a suction device.