JPH0730109Y2 - Filter material for bag-shaped air filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a bag-shaped (bag-shaped) filter material for an air filter.

[Prior Art] Conventionally, as a filter material for a bag-shaped air filter, those shown in FIGS. 5 to 6 and 7 have been known.

FIG. 5 is a perspective view showing a first conventional example of a bag-shaped filter material for an air filter, and FIG. 6 is a transverse sectional view of the same. The first conventional example will be described below.

A rectangular filter paper is bent into two equal parts to provide two bent pieces 21a, 21b and a bent edge 22, and upper and lower edge parts 23a, 23b of each bent piece 21a, 21b. Is sewn and fixed by sewing with a thread 24 to form a bag portion 26 having an opening 25 on the front surface, and a void portion 27 is provided without tightly contacting the bent pieces 21a and 21b of the bag portion 26. So that the folded pieces 21a, 21b can be equally divided in the vertical direction so that they can be held in a wedge-shaped cross section, a thread 28 is formed from the bent edge 22 of the bag 26 to the opening 25.
The length of the thread 28 inserted into the void portion 27 of the bag portion 26 is gradually increased from the bent edge 22 to the opening 25 by adjusting the length by The pieces 21a, 21b are sewn together over several lines, and the adhesive 29 is applied to the sutured portion by the threads 24, 28 exposed on the outer surface of each of the bent pieces 21a, 21b.
The sewn portion is reinforced and formed.

The length of the thread 28 inserted into the void portion 27 of the bag portion 26 is configured to gradually increase from the bent end edge 22 to the opening portion 25, which is a conventional configuration having the above configuration. When a plurality of bag-shaped filter media for air filters are connected in series at the ends of the openings 25 to form a filter unit, the bag parts 26 are inflated by the air blow, so that adjacent filter media come into contact with each other to effectively filter the air flow. This is to prevent the area from becoming small.

Further, FIG. 7 is a perspective view showing a second conventional example of a conventional bag-shaped filter medium for an air filter. The second conventional example will be described below.

A rectangular filter paper is bent into two equal parts to provide two bent pieces 31a and 31b and a bent edge 32, and upper and lower edges 33a and 33b of the bent pieces 31a and 31b. Is sewn and fixed with a thread 34 by sewing with a sewing machine to form a bag portion 36 having an opening edge 35 on the front surface.
Further, at the position where each of the bent pieces 31a and 31b is equally divided in the vertical direction in the vertical direction, sewing is performed by sewing with thread 37 from the bent end edge 32 to the open end edge 35 by sewing, and a small number is attached to the front surface. A plurality of small voids 39 having openings 38 are provided, and an adhesive 40 is applied to the sewn portions of the threads 34, 37 to reinforce the sewn portions.

[Problems to be Solved by the Invention] However, in the first conventional example, the manufacturing apparatus is required to have a complicated mechanism, and it is necessary to reinforce the sutured portion with the thread by applying an adhesive.

Further, although the second conventional example can be processed even with a household sewing machine, it is easy to cause hanging in the sewn state of each small void portion, and it is difficult to uniformly machine and finish. It is necessary to reinforce the sewn part by applying an adhesive in order to retain the space and prevent the pain of the filter medium.

From the above, the conventional one has a risk that the filter medium surface may be rubbed or damaged during its manufacturing process, resulting in a decrease in pressure resistance, a decrease in service life, and a decrease in work efficiency. There was a point.

The present invention is intended to provide a bag-shaped filter material for an air filter, which is intended to solve the conventional problems.

[Means for Solving the Problems] The present invention is to fold a rectangular filter paper made of synthetic fiber non-woven fabric into two equal parts to provide two bent pieces and a bent edge, and each bent piece. The upper and lower edges of each of the above are welded and fixed by an ultrasonic sewing machine or a high-frequency sewing machine to provide end welding lines to form a bag portion having an opening on the front surface, while each bent piece of the bag portion is moved up and down. At a position where it is equally divided in the horizontal direction, a plurality of long and short welding lines are alternately provided by welding and fixing with the ultrasonic sewing machine or the high-frequency sewing machine from the bent edge to a position slightly before the opening edge. The above-mentioned problem is solved by adopting a means of connecting large, medium and small voids in series from the opening side toward the bent edge to maintain the wedge-shaped cross section. Solved.

[Operation] According to the present invention having the above-described structure, a uniform filter medium having a substantially wedge-shaped cross section can be obtained by welding using an ultrasonic sewing machine or a high-frequency sewing machine without using sewing thread or adhesive. Large area can be maintained.

Friction and damage on the surface of the filter medium during the manufacture of the filter medium are prevented.

[Embodiment] To explain one embodiment of the present invention in detail with reference to the drawings, a rectangular filter paper made of synthetic fiber non-woven fabric is bent into two equal parts, and two folding pieces 1a, 1b and bent edge 2 are provided, and upper and lower edges 3a, 3b of each bent piece 1a, 1b are welded and fixed by an ultrasonic sewing machine or a high frequency sewing machine, and end welding lines 4a, 4b are provided. And a bag portion 6 having an opening 5 on the front surface.
To form.

Then, at a position where each of the bent pieces 1a, 1b of the bag portion 6 is equally divided vertically in the vertical direction, from the bent edge 2 to a position slightly before the edge of the opening 5, the ultrasonic sewing machine or the high frequency sewing machine is used. , The bent pieces 1a, 1b are fixed by welding, and a plurality of long and short welding lines 7a, 7b are alternately provided, and the upper and lower ends from the opening 5 side toward the bent end edge 2 A large void portion 8 defined by the partial welding lines 4a, 4b, an intermediate void portion 9 defined by the end welding lines 4a, 4b and a long welding line 7a, and the end welding lines 4a, 4b and each length, Small void portions 10 defined by the short welding lines 7a and 7b are respectively provided in series so as to maintain a wedge-shaped cross section.

As described above, a synthetic fiber non-woven fabric is used as the material of the filter medium of the present invention. In the case of a synthetic fiber non-woven fabric, in addition to the welding process using the ultrasonic sewing machine or the high-frequency sewing machine, it is possible to sew with a thread as in the conventional case, but the welding process using the ultrasonic sewing machine or the high-frequency sewing machine is more suitable for the material of the filter medium, Since it is possible to adjust the optimum welding state according to the condition of the product, thickness, etc., and because it does not require a reinforcing adhesive, it is superior to the sewing process using threads. Welding process using ultrasonic sewing machine or high-frequency sewing machine was adopted for synthetic fiber nonwoven fabric.

In addition to the above, welding processing by heat is also possible,
Since this means may cause the temperature of the surface of the filter medium to become higher than that of the welded portion, and the filter medium may be melted to lower the strength, it is not so preferable and cannot be adopted in the present invention.

Next, the operation of the embodiment of the present invention will be described.

Since the large, medium and small voids 8, 9 and 10 are continuously formed, the filter medium according to the present invention maintains a wedge-shaped cross section as shown in FIG. When a plurality of devised filter media are connected to each other at the ends of the openings 5 to form a filter unit, even if the bag portion 6 swells due to the blown air, the adjacent filter media do not come into contact with each other and the effective filtration area during ventilation is small. Can be prevented.

[Advantages of the Invention] Since the present invention is as described above, by welding synthetic fiber non-woven fabric with an ultrasonic sewing machine or a high-frequency sewing machine, sewing thread and adhesive as in the prior art are not required, so that the entire filter medium is eliminated. Can be made to have a simple structure with a uniform material, and no dragging due to the yarn is generated during the manufacturing process, so that the number of working steps can be reduced and the working efficiency can be improved. In addition, there is no risk of friction or damage to the filter medium surface due to the thread,
The strength is the same as that of conventional products, and pressure resistance and service life can be improved. Furthermore, since each bent piece is fixed by welding and a plurality of long and short welding lines are provided, large, medium, and small voids are formed in the bag, respectively. When the filter unit is held in a substantially cross-sectional wedge shape, which is an ideal shape as a filter medium, and a plurality of these filter mediums are continuously connected and fixed at their opening portions to form a filter unit, even if the bag portion swells due to air blow, It is possible to prevent the effective filtration area when ventilation is reduced without the adjacent filter media coming into contact with each other.

[Brief description of drawings]

1 is an overall perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line I--I of FIG. 1, FIG. 3 is a plan view thereof, FIG. 4 is a right side view thereof, and FIG. The figure is an overall perspective view showing a first conventional example,
FIG. 6 is a sectional view taken along the line II-II in FIG. 5, and FIG. 7 is an overall perspective view showing a second conventional example. In the figure, 1a and 1b are bent pieces, 2 are bent edges, 3a and 3b are upper and lower edges, 4a and 4b are end welding lines, 5 is an opening, 6 is a bag, and 7a and 7b.
Indicates long and short welding lines, and 8, 9 and 10 indicate large, medium and small voids.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Hakama, 3-7-6 Oyama, Sagamihara-shi, Kanagawa Nakazato Apartment Room 201 (72) Creator Seiichi Takizawa 4--4, Kyowa, Sagamihara-shi, Kanagawa ( 56) References JP-A-57-197014 (JP, A) JP-A-49-101968 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A rectangular filter paper made of a synthetic fiber non-woven fabric is bent into two equal parts to provide two bent pieces and bent edges, and the upper and lower edges of each bent piece are An ultrasonic welding machine or a high-frequency sewing machine is used for welding and fixing to provide an end welding line to form a bag portion having an opening on the front surface, and at the position where each bent piece of the bag portion is equally divided vertically in the vertical direction. From the opening side, a plurality of long and short welding lines are alternately provided by welding and fixing with the ultrasonic sewing machine or the high frequency sewing machine from the bent edge to a position slightly before the opening edge. A bag-shaped filter medium for air filters, which is formed by connecting large, medium, and small voids in series toward the curved edges to maintain a wedge-shaped cross section.