JP6715653B2 - Cylindrical filter - Google Patents

Description

The present invention relates to a tubular filter.

BACKGROUND ART Conventionally, a pleated filter is known in which a hot-melt resin is linearly applied to a filter medium folded in a pleated shape so as to maintain a corrugated shape (see Patent Document 1).
There has been a case where a pleated filter as described in Patent Document 1 is curved in a circular shape and used as a cylindrical filter of an overall closed cylinder type (see Patent Document 2).

JP, 2008-296124, A JP, 2010-162449, A

As shown in FIG. 8, in the pleat filter 44, the hot-melt resin 46 is applied to all of the folds 49 on the front side and the folds 48 on the back side of the filter medium 45 folded alternately. It is attached in the shape of a wavy shape and holds a wavy shape (pleated shape). As shown in FIG. 7, the pleated filter 44 was bent into an overall closed cylinder type to form a cylindrical filter 50.

However, in the manufacture of the tubular filter 50, when the pleat filter 44 is curvedly formed into a totally closed tubular type (cylindrical type), the fold portion 48 on the inner peripheral side receives a compressive force and no problem occurs. A large tensile force F acts in the circumferential direction on the side folds 49 (see FIG. 9).
Such a large tensile force F acts on the fold portion 49 on the outer peripheral side, and as shown in FIG. 9, the hot melt resin 46 attached to the fold portion 49 is broken (tipped) and damaged portions 47, 47. Was sometimes formed. Further, when the pleat filter 44 is formed into a closed cylinder type, it is very difficult to bond the pleated filter 44 at one place on the circumference, and the manufacturing efficiency is lowered.

When the cylindrical filter 50 is a dust collecting filter for removing very small substances and dust from the air, the filter medium 45 is often made of ultrafine fibers, and when the hot melt resin 46 is peeled off, In some cases, the filter medium 45 that is brittle and easily broken may be damaged, resulting in a break 45Z as shown in FIG. In the tubular filter 50, the occurrence of such a breakage portion 45Z of the filter medium 45 immediately causes a big problem that the efficiency of collecting dust and the like decreases.

Therefore, it is an object of the present invention to provide a tubular filter that can be reasonably bent into an overall closed-tube type and can prevent the occurrence of a damaged portion and a filter material ruptured portion. Further, it is possible to stably and efficiently manufacture a high-performance and high-quality cylindrical filter for collecting dust.

The tubular filter according to the present invention has a tubular body formed by folding a sheet-shaped filter medium into a pleated shape to form an overall closed tubular shape, and sequentially adhering the inner folds of the tubular body to the entire inner circumference. An inner peripheral side hot melt resin wire is provided, and an outer peripheral side hot melt resin wire is provided for each of the plurality of mountain folds forming the outer fold of the tubular body, and The mountain folds are independently adhered to each other and the outer folds are in a non-bonded state .

According to the tubular filter of the present invention, the outer folds adjacent to each other in the circumferential direction can be independently rocked, no excessive force is applied when bending, and partial damage can be prevented. Further, it is possible to prevent the fiber of the filter medium from being broken, and the dust collection performance (efficiency) of the dust collection filter is stable and excellent, and the dust collection efficiency can be kept good over a long period of use. When forming the entire closed-cylindrical type, it is easy to bond at one place on the circumference, and the manufacturing efficiency can be improved. At the time of transportation, a large number of cuboids can be compactly packed, and transportation efficiency can be improved.

It is a perspective view showing one embodiment of a cylindrical filter concerning the present invention. It is a principal part expanded sectional top view. It is a top view which shows the filter medium before being folded. It is a perspective view which shows the folded filter medium. It is an expanded sectional top view showing the reference example deeply related to the cylindrical filter concerning the present invention. Are diagrams for explaining a modification of the cylindrical filter of the present invention, (A) is a diagram showing a cylindrical state, (B) is a diagram showing a rectangular state. It is a perspective view which shows the conventional cylindrical filter. It is a perspective view which shows the pleat filter as a semi-finished product of the conventional cylindrical filter. It is a principal part expanded sectional top view of the conventional cylindrical filter.

Hereinafter, the present invention will be described in detail with reference to the drawings showing an embodiment.
The tubular filter of the present invention is attached to an air purifier, a humidifier, a dust collector, a deodorizer, or the like, and is mainly used as an air filter for humidifying, dedusting, or deodorizing air.
As shown in FIGS. 1 and 2, the sheet-shaped filter medium 1 is folded in a pleat shape (alternately in the opposite direction) to have a tubular body 5 formed into an overall closed tubular shape. A large number of outer folds 2 are formed on the inner side, and a large number of inner folds 3 are formed on the inner peripheral side. An inner peripheral side hot-melt resin wire 4 is provided on the cylindrical body 5 so that the inner folds 3 are sequentially adhered and bonded over the entire inner periphery.

The outer fold portion 2 of the tubular body 5 is provided with an outer peripheral side hot-melt resin wire 6 apart from the outer fold portion 2 so that the outer fold portion 2 can be freely expanded or contracted without interfering with each other. Is possible. That is, the outer folds 2 are in a non-bonded state, and are supported by the joined part (the inner peripheral side hot melt resin wire 4) of the inner folds 3 so that they can swing independently.
The hot melt resin wires 4 and 6 on the inner and outer circumference sides are made of thermoplastic synthetic resin, and for example, polyolefin synthetic resin, polyurethane synthetic resin, polyamide synthetic resin or the like can be used.
As the filter medium 1, non-woven fabric, paper, woven fabric, or a laminated body in which these are combined can be used. FIG. 4 shows, as an example, a filter medium 1 made of a non-woven fabric having high water absorption and having a large number of through holes 9 for ventilation. The filter medium 1 is excellent in water absorption, has a small ventilation resistance, and is suitable for use as a humidifying filter.
When the tubular filter of the present invention is used as a dust collecting filter in a dust collector, a non-woven fabric (having no holes) made of ultrafine fibers of polyester synthetic resin or polypropylene synthetic resin is used as the filter medium 1. Are preferably formed.

As shown in FIG. 3, the filter medium 1 is in the state of a flat sheet, and the mountain-folding planned line portions 11 and the valley-folding planned line portions 12 are alternately formed in the longitudinal direction over the entire length in the width direction. Before the filter medium 1 is folded in a pleat shape, the hot melt resin 13 in a molten state is attached to the front surface side of the expected mountain fold line portion 11 one by one. The hot melt resins 13 each have an elongated shape and are arranged in a plurality of rows. The hot-melt resin 13 may be prepared by previously heating and melting a thermoplastic resin by a heating means, discharging it from a nozzle at a fixed interval, and adhering the hot-melt resin 13 on the planned mountain fold line portion 11 one by one. Although illustration is omitted, the hot melt resins 13 may be arranged in a zigzag pattern on the planned mountain fold line portion 11 by shifting the positions of the rows of the hot melt resins 13, 13 adjacent to each other in the width direction. The hot-melt resin 14 in a molten state is attached to the back surface side of all the planned valley-folding line portions 12. The hot melt resin 14 on the back surface side may be attached at intervals as shown in the figure, or may be continuously formed (not shown).

When the filter medium 1 is alternately folded in the opposite direction along the planned mountain fold line portion 11 and the planned valley fold line portion 12, as shown in FIG. 4, the pleats having the mountain fold portions 22 and the valley fold portions 23 alternately. The folded body 20 is formed.
In the folded body 20, the hot melt resin 13 attached to the planned mountain fold line portion 11 solidifies without sticking to the other hot melt resin 13 when the mountain fold portion 22 is formed. That is, the mountain folds 22 and 22 adjacent to each other are not in a coupled state, but are kept in an independent state. In addition, on the back surface side of the folded body 20, between the adjacent valley folds 23, 23, the hot melt resins 14, 14 are solidified (adhered) in a state of sticking to each other, and the adjacent valley folds 23, 23 are formed. 23 are connected. The folded body 20 is bent into a tubular shape with the mountain folds 22 facing outward and the valley folds 23 facing inward, and both ends of the folded body 20 are bonded to each other (using an adhesive). Then, the whole is formed into a closed cylinder type. When the folding body 20 is bent, the outer fold portion 2 (mountain fold portion 22) is opened freely, so it can be bent easily without undue force, and it is also easy to bond at one circumference. You can do it.

Next, a reference example closely related to the present invention will be described.
As shown in FIG. 5, a sheet-shaped filter medium 1 is folded into a pleat shape to have a tubular body 5 which is formed into an overall closed tubular shape. The inner peripheral side hot melt resin wire 4 is provided so as to be connected to the outer fold portion 2, and the hot melt resin wire is omitted from the outer fold portion 2 to leave the outer fold portion 2 in a non-bonded state.
In FIG. 5, less hot melt resin is used (compared to FIG. 2), and the material cost can be kept low. Further, in the manufacturing process, since the hot melt resin only needs to be attached to the back surface side of the filter medium 1, the manufacturing apparatus can be simplified and the cost can be reduced.

The usage (action) of the above-described tubular filter of the present invention will be described.
When the tubular filter of the present invention is installed in an air purifier, a dust collector, or the like, an internal cylindrical body for maintaining a cylindrical shape or an outer ring body is attached (not shown).
As shown in FIG. 2, the outer folds 2 of the cylindrical body are held by the outer peripheral side hot-melt resin wire 6 so as not to come into close contact with each other. For example, even when the filter medium 1 absorbs water and is wet, it is at least equivalent to the thickness of the hot-melt resin wire 6 so that adjacent outer folds 2 and 2 do not come into close contact with each other to increase ventilation resistance. Keep the space between them to maintain breathability.

Further, the cylindrical filter of the present invention can be freely deformed into the cylindrical shape shown in FIG. 6(A) and the rectangular parallelepiped shape shown in FIG. 6(B). For example, when the tubular filter is transported, if it is packed in a cylindrical shape as shown in FIG. 6A, it may be bulky and the transportation efficiency may be reduced. However, as shown in FIG. It can be transported efficiently by transforming it into a shape and packing a large number of them into a compact package. In FIG. 6, the inner peripheral side hot melt resin wire 4 and the outer peripheral side hot melt resin wire 6 are omitted.

The present invention can be modified in design, and for example, the number of outer folds 2 and inner folds 3 can be freely changed by adjusting the number of times the filter medium 1 is folded.

As described above, the tubular filter according to the present invention has the tubular body 5 in which the sheet-shaped filter medium 1 is folded into a pleat shape to form an overall closed tubular shape, and the inner fold portion of the tubular body 5 is provided. The inner peripheral side hot-melt resin wire 4 for sequentially bonding and bonding the entire inner circumference is provided, and since the outer folds 2 of the tubular body 5 are in a non-bonded state to each other, the outer peripheral folds 2 are circumferentially bonded. Adjacent outer folds 2 and 2 can be independently rocked, no excessive force is applied during bending, partial damage can be prevented, and in particular, fiber breakage of the filter medium 1 can be prevented, As a dust collecting filter, the dust collecting performance (efficiency) is stable and excellent, and moreover, the dust collecting efficiency can be kept good over a long period of use. When forming the entire closed-cylindrical type, it is easy to bond at one place on the circumference, and the manufacturing efficiency can be improved. At the time of transportation, a large number of cuboids can be compactly packed, and transportation efficiency can be improved.

Further, since the outer peripheral fold portion 2 of the tubular body 5 is provided with the outer peripheral side hot melt resin wire 6 spaced apart from the outer fold portion 2 to bring the outer fold portion 2 into the non-bonded state, the adjacent outer fold portions 2 , 2 can be kept at a distance so that they do not come into close contact with each other, and ventilation can be maintained without increasing ventilation resistance.

Further, since the hot-melt resin wire is omitted in the outer fold portion 2 of the tubular body 5 to bring it into the non-bonded state, the hot-melt resin used can be reduced and the material cost can be kept low. Further, in the manufacturing process, since the hot melt resin only needs to be attached to the back surface side of the filter medium 1, the manufacturing apparatus can be simplified and the cost can be reduced.

1 Filter Material 2 Outer Folding Part 3 Inner Folding Part 4 Inner Circumferential Side Hot Melt Resin Wire 5 Cylindrical Body 6 Outer Circumferential Side Hot Melt Resin Wire
22 Mountain folding section

Claims (1)

A tubular body (5) formed by folding the sheet-shaped filter material (1) into a pleated shape to form an overall closed tubular shape,
An inner peripheral side hot-melt resin wire (4) for sequentially adhering the inner folds (3) of the tubular body (5) and bonding them together over the entire inner periphery is provided,
The plurality of mountain folds (22) forming the outer folds (2) of the tubular body (5) are provided with an outer peripheral side hot melt resin wire (6) at intervals of one, and moreover, a plurality of the above mountain fold portion (22), without being adhered to each other, each independently, cylindrical filter, wherein said outer fold portion (2) are uncoupled.

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