JP3569770B2 - Filter media and unit filters - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a filter medium and a unit-type filter used for, for example, a filter for general air purification or for collecting specific particles such as toner. More particularly, the present invention relates to a filter medium and a unit-type filter in which even if the filter medium shrinks in the mountain fold line direction, adjacent folds are unlikely to come into contact with each other and a region that does not contribute to filtration is hardly formed.
[0002]
Problems to be solved by the prior art and the invention
Conventionally, there has been known a unit type filter 1 in which a resin frame 3 is provided around a pleated filter medium 2 as shown in FIG. In this unit type filter 1, the resin frame 3 is formed using a molding die (not shown) on all four sides of the pleated filter medium 2 other than the surface where the gas inflow portion and the gas outflow portion are located. In the process of cooling, the filter media 2 may contract in the fold line direction of the filter media 2 to cause distortion. In this case, as shown in FIG. 4, the adjacent folds 2a of the filter media 2 bend and contact to contribute to filtration. There is a problem that a region (dead space) not to be formed is formed.
[0003]
The present invention has been made in view of such problems, and even if shrinkage occurs in the mountain fold line direction of the filter medium, it is difficult for adjacent folds to come into contact with each other, and it is difficult to form a filter medium that does not contribute to filtration. It is an object of the present invention to provide a unit type filter.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is a filter medium which is laminated and integrated so as to form one layer or substantially one layer and which is pleated, wherein a gas inflow portion and a gas outflow portion of the filter material are provided. A fold line is formed in the fold of the filter medium where the resin frame is formed using a molding die on all four sides other than the side with the ridge so as to intersect the mountain fold line, and shrinkage occurs in the mountain fold line direction of the filter medium. The gist of the present invention is to provide a filter medium characterized in that the folds are bent in the same direction along the fold lines when the folds are folded.
[0005]
According to a second aspect of the present invention, there is provided the filter medium, wherein a fold line is formed so as to intersect with a mountain fold line in a fold of the filter medium which is laminated and integrated so as to be a single layer or substantially a single layer, and which is pleated. When shrinkage occurs in the mountain fold line direction , the forming dies are formed on four sides other than the surface where the gas inflow portion and the gas outflow portion of the filter medium are bent in the same direction along the fold lines. The gist is a unit type filter characterized by using a resin frame .
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a filter medium and a unit filter according to the present invention will be described in detail with reference to the drawings. The unit type filter 11 shown in FIGS. 1 and 2 has a pleated filter medium 12 provided with a resin frame 13 on all four sides other than the surface where the gas inflow portion and the gas outflow portion are located.
[0007]
The filter medium 12 is made of a nonwoven fabric, paper, woven fabric, knitted fabric, net, or the like having a degree of elongation and strength such that the shape after folding is not easily collapsed. Depending on the size and application of the filter, such as those obtained by laminating multiple sheets of paper, or laminating different types of materials such as those obtained by laminating and integrating resin-bonded nonwoven fabric and melt-blown nonwoven fabric Can be designed freely. In particular, a resin-bonded nonwoven fabric and a melt-blown nonwoven fabric are preferably laminated and integrated.
[0008]
As a method of pleating the filter medium 12, a zigzag shape is imparted to the filter medium by a pleating machine such as a reciprocating system or a rotary system, or the filter medium is pressed by a pressing die formed in a zigzag shape, so that the filter medium is zigzag. A conventionally known method such as giving a shape can be used.
[0009]
A fold line 15 is formed substantially at the center of the fold 12a of the pleated filter medium 12 so as to intersect with the mountain fold line 14 of the filter medium 12, particularly preferably perpendicularly. Prior to the pleating, the fold line 15 is formed by linearly pressing a position where the fold line 15 of the filter medium 12 is to be formed to form a linear concave portion, or by pleating the filter medium 12 using a jig or the like. Can be formed by bending at a position where is to be formed.
[0010]
The position of the fold line 15 is formed at the center of the fold 12a in FIGS. 1 and 2, but is not limited thereto and may be on the side. However, the filter media 12 is best formed at the central portion of the fold 12a in order to absorb the distortion caused by the contraction of the filter medium 12 in the direction of the mountain fold line 14 in a well-balanced manner.
[0011]
In addition, the fold line 15 may be formed on at least one surface of the left and right folds 12 a bordering the mountain fold line 14 of the filter medium 12.
[0012]
The resin frames 13 are provided on the four sides of the filter medium 12 on which the fold line 15 is formed, except for the gas inflow portion and the gas outflow portion . The resin frame 13 is made of a resin such as a polypropylene resin, a polystyrene resin, an acrylonitrile-butadiene-styrene copolymer (ABS resin), and these resins are formed using a molding die at the gas inlet and the gas outlet of the filter medium 12 . It is formed by pouring into four sides other than a certain surface and cooling.
[0013]
When the resin frame 13 is formed on the four sides of the filter medium 12 other than the plane where the gas inflow section and the gas outflow section are provided , the resin shrinks in the process of cooling the resin, and the filter medium 12 is distorted in the direction of the mountain fold line 14. Sometimes. At this time, since the folds 12a of the filter medium 12 are bent in the same direction along the fold line 15 as shown in FIG. 1, the adjacent folds 12a hardly come into contact with each other and do not contribute to filtration. Regions are difficult to form.
[0014]
The embodiment shown in FIG. 3 is applied to a wide unit filter 11, in which each fold is bent in the same direction along a fold line 15a and in the opposite direction along a fold line 15b. The filter medium 12 is arranged so as to be bent. In this case, when the filter medium 12 contracts in the direction of the mountain fold line 14 in the process of cooling the resin, the filter medium 12 bends in the direction along the fold line 15a and the direction along the fold line 15b. The bending angle of each fold of the filter medium 12 becomes shallower than in the case where the filter medium is folded, so that distortion due to contraction of the filter medium 12 in the direction of the mountain fold line 14 can be more stably absorbed.
[0015]
【The invention's effect】
In the filter medium according to the first aspect, even if shrinkage occurs in the direction of the mountain fold line of the filter medium, each fold is identical along a fold line formed so as to intersect the mountain fold line in the fold of the filter medium. Since it is bent in the direction, it is difficult for adjacent folded folds to come into contact with each other, and it is difficult to form a region that does not contribute to filtration.
[0016]
In the unit-type filter according to the second aspect, even if the filter medium contracts in the mountain fold line direction, each fold is formed along a fold line formed so as to intersect the mountain fold line in the fold of the filter medium. Uses a filter medium that is bent in the same direction, and a resin frame is provided around this filter medium, so that adjacent folding folds are not in contact with each other, there is no area that does not contribute to filtration, and more efficient Filtration can be performed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a unit-type filter of the present invention.
FIG. 2 is an enlarged front view of a main part of the filter medium as viewed from the side.
FIG. 3 is a perspective view showing another example of the unit-type filter of the present invention.
FIG. 4 is a perspective view showing a conventional unit-type filter.
[Explanation of symbols]
12 filter medium 13 resin frame 14 mountain fold line 15 fold line

Claims (2)

A filter material which is laminated and integrated so as to form a single layer or substantially a single layer, and which is pleated. A fold line is formed in the fold of the filter medium to be formed so as to intersect the mountain fold line, and when shrinkage occurs in the mountain fold line direction of the filter medium, the folds are the same along the fold line. A filter medium characterized by being bent in a direction. A fold line is formed so as to intersect the mountain fold line in the fold of the filter medium which is laminated and integrated so as to be one layer or substantially one layer, and is pleated. When it occurs, a resin frame is formed using a molding die on all four sides other than the surface where the gas inflow portion and the gas outflow portion of the filter medium are bent in the same direction along the fold lines. A unit type filter characterized by the above-mentioned.

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