JP2733819B2 - Filter media and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter medium filled for wastewater treatment or for gas washing and gas mixing reactions, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, there is a hollow cylindrical filter medium. However, in such a structure, the fluid easily flows through the hollow portion and hardly flows from the outside into the hollow portion. There was a problem that the balance was poor due to the deviation in the direction, and the processing ability as a filter medium could not be fully exhibited.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention is to provide a filter medium in which fluids can flow in a balanced manner in the vertical and horizontal directions and can exert a sufficient processing capacity, and to provide such a filter medium easily and efficiently at low cost. It is an object of the present invention to provide a manufacturing method capable of producing well.

[0004]

In order to achieve the first object, a filter medium of the present invention is composed of a plurality of synthetic resin-made linear bodies 1 which are bent and gathered together with their contacts in a three-dimensional network. The dense wall 2 that has become a structure and the dense wall 2
A linear body 1 identical to the linear body to be formed is continuously formed on the dense wall portion 2.
Sparse wall portion 3 formed by being arranged in a substantially straight state
And characterized in that:

Further, in order to achieve the second object, the method for producing a filter medium of the present invention comprises a method of extruding a plurality of linear plastics formed by extruding a synthetic resin in a molten state from a plurality of nozzles 5 of an extruder 4. A step of continuously lowering the body 1 and pulling the linear body 1 at a speed lower than the lowering speed by a take-off device arranged below the main body 1;
And the step of taking off at substantially the same speed, the dense walls 2 having a three-dimensional net-like structure in which the linear bodies 1 meander and assemble while attaching contacts to each other.
And the same linear body 1 as the linear body forming the dense wall portion 2
The sparse wall part 3 which is arranged in a substantially straight state continuously to the dense wall part 2
And solidified by cooling.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 shows a filter medium 6 of the present invention.
The filter medium 6 has a cylindrical shape as a whole, and its peripheral wall is constituted by the dense wall portion 2 and the sparse wall portion 3. The dense wall portion 2 is a three-dimensional net-like structure in which a plurality of linear bodies 1 made of a synthetic resin such as polypropylene meander and gather together while attaching their contacts to each other. Are a plurality of linear members 1 which are the same as the linear members 1 of the dense wall portion 2
Are arranged in a substantially straight state without being bent. Of course, the dense wall portion 2 has a higher density of the linear body 1 than the sparse wall portion 3, and the sparse wall portion 3 has a dense wall. The aperture ratio is larger than that of the part 2. Therefore, at the position where the dense wall portion 2 exists, the fluid easily flows in the hollow portion inside in the vertical direction, but at the position where the sparse wall portion 3 exists, the fluid passes through the sparse wall portion 3 and also flows laterally. Therefore, the fluid flows in the vertical direction and the horizontal direction in a well-balanced manner, and the processing capacity as the filter medium 6 is fully exhibited.

Next, FIG. 2 shows a manufacturing process of the above-mentioned filter medium 6. That is, the above-mentioned filter medium 6 is
A plurality of linear members 1 formed by extruding a synthetic resin such as polypropylene in a molten state from a plurality of nozzles 5 provided in a circular arrangement on the lower surface of a plurality of linear members 1 are continuously lowered, and a take-off device provided with a transmission 7 below the linear members 1 is provided. Roller 8 is disposed, and the take-off roller 8
The rotational speed of the linear member 1 is adjusted to be lower than or substantially equal to the descending speed of the linear member 1 by the transmission 7, and the respective linear members 1 are meandered in the former state, so that the contact points of each other are adjusted. They are assembled while being attached to form a cylindrical dense wall portion 2 having a three-dimensional net structure, and in the latter state, the linear bodies 1 are arranged in a cylindrical shape while being kept in a substantially straight state to form a sparse wall portion 3, which is cooled. It is obtained by immersing it in water 9, cooling and solidifying, and then cutting it to an appropriate length.

Although the filter medium 6 of the above embodiment is cylindrical, the shape of the filter medium of the present invention is not limited to this, and may be a square or any other shape. To change the shape, the arrangement of the nozzle 5 on the lower surface of the extruder 4 may be changed.

[0009]

Since the filter medium 6 of the present invention has the dense wall portion 2 and the sparse wall portion 3 as described above, the fluid can flow in the vertical and horizontal directions in a well-balanced manner, and the processing capacity as the filter medium can be fully achieved. There is an operational effect that can be exerted. In addition, the method for manufacturing a filter medium of the present invention comprises the above-described dense wall portion 2 and sparse wall portion 3.
There is an operational effect that the filter medium 6 having the above can be easily and efficiently manufactured. In particular, when an attempt is made to form a filter medium having such a structure by an injection molding method, a mold for forming the dense wall portion 2 and a mold for forming the sparse wall portion 3 must be provided, which is extremely costly. However, in the manufacturing method of the present invention, the dense wall portion 2 and the sparse wall portion 3 can be formed together without changing the manufacturing equipment, which is extremely advantageous in terms of cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a filter medium.

FIG. 2 is a manufacturing process diagram of a filter medium.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Linear body 2 Closed wall part 3 Sparse wall part 4 Extruder 5 Nozzle 6 Filter medium 7 Transmission 8 Take-off roller 9 Cooling water

Claims (2)

(57) [Claims] 1. A dense wall portion 2 in which a plurality of linear members 1 made of synthetic resin meander and gather while adhering to each other to form a three-dimensional net-like structure, and a linear member forming the dense wall portion 2
The same linear body 1 is continuous with the dense wall 2 and is substantially straight
And a sparse wall portion 3 formed by arranging the filter media in a line. 2. A plurality of linear bodies 1 formed by extruding a synthetic resin in a molten state from a plurality of nozzles 5 of an extruder 4 are continuously lowered, and the above-mentioned wire is drawn by a take-off device arranged below the plurality of linear bodies. By combining the step of pulling the linear bodies 1 at a speed lower than the descending speed and the step of shifting the take-off device to pull the linear bodies 1 at substantially the same speed as the descending speed of the linear bodies 1, the respective linear bodies 1 meander and contact each other. The dense wall part 2 which gathers together and forms a three-dimensional net-like structure, and the dense wall part 2
A linear body 1 identical to the linear body forming
Forming a sparse wall portion 3 arranged in a substantially straight state and cooling and solidifying the sparse wall portion 3.