JP2012115809A - Filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter which can reduce consumption (necessary amount) of a spacer (adhesive) and also reduce structural pressure loss and wind passing resistance.SOLUTION: In the filter 11, a filter base material 12 is folded in such a manner that the flat portions 12a stand in a row like a folding screen, intervals between the flat portions 12a are secured by spacers 13, and the flat portions 12a are fixedly connected to each other by the spacers 13. The spacers 13 are arranged on the valley side in which the flat portions 12a are valley-folded and also arranged in a zigzag manner in the direction in which the flat portions 12a stand in a row.

Description

  The present invention relates to a filter for capturing fine particles in the air.

  Air cleaners, dust collectors, and the like are provided with a filter for capturing fine particles in the air.

  This filter is manufactured as follows, for example.

First, after the filter base material is folded (folded) so that the plane portion is continuous in a folding screen, the folded filter base material is developed and temporarily returned to the flat shape.
And after apply | coating several strips of adhesives continuously in the direction where a plane part continues on the front and back of the filter base material (plane part) returned to planar shape, it folds a filter base material (plane part) again in a folding screen shape. (Fold).

  In this way, when the filter base material (flat part) coated with adhesive is folded in a folding screen, the adhesives are bonded together to connect and fix the flat parts, and the adhesive functions as a spacer, The space | interval of a plane part can be ensured to the space | interval according to the usage-amount of an adhesive agent, and a filter medium area can be ensured.

  Since the adhesive is continuously applied to the above-described filter, that is, the adhesive is also provided (arranged) on the outer portion where the filter base (planar portion) is folded, so the filter The effective filter medium area of the substrate is reduced, and the structural pressure loss is increased (increased).

  Therefore, in order to reduce the structural pressure loss of the filter and reduce the amount of use of the adhesive (spacer), the adhesive is applied to the fold portion of the filter substrate (plane portion), that is, the mountain fold portion and the valley fold portion. It has been proposed to be discontinuous (see, for example, Patent Document 1).

JP 2000-107539 A

  However, the filter proposed by Patent Document 1 has the following inconvenience because the adhesive is discontinuous only at the fold portion of the filter base (planar portion).

First, when the height (folding height) of the flat surface portion is increased, the attachment amount of the adhesive is increased due to an increase in the attachment length of the adhesive, and the usage amount (necessary amount) of the adhesive is increased.
In addition, when the height (folding height) of the plane portion is increased, it is necessary to reduce the resistance of the wind by increasing the interval between the plane portions, but as the interval between the plane portions is increased, that is, bonding As the height of the agent is increased, the width of the adhesive is increased, so that the amount of the adhesive used (necessary amount) is increased, and the structural pressure loss and the wind passage resistance are increased (increased).

  The present invention has been made to solve the above-mentioned disadvantages, and can reduce the amount of use (necessary amount) of the spacer (adhesive), as well as the structural pressure loss and the wind passage resistance. An object of the present invention is to provide a filter that can be used.

  (1) The filter of the present invention is a filter in which the filter base is folded so that the plane portions are connected in a folding screen, and the interval between the plane portions is secured with a spacer, and the plane portions are connected and fixed with the spacer. The spacer is arranged on the valley side where the flat portion is folded.

  (2) The filter according to the present invention is characterized in that, in the filter according to (1), the spacers are arranged in a zigzag manner in a direction in which the planar portions are continuous.

  (3) The filter according to the present invention is characterized in that, in the filter according to (1) or (2), the adjacent spacers are overlapped in a direction intersecting a direction in which the planar portions are continuous.

(4) The filter according to the present invention is characterized in that, in the filter according to (3), a length in which the spacers overlap each other is set to 5 mm to 200 mm.
It is a sign.

  According to the filter of the present invention, since the spacer is disposed on the valley side where the flat portion is folded, the amount of use (necessary amount) of the spacer (adhesive) can be reduced, and the structural pressure loss and wind can be reduced. The passage resistance can be reduced.

  According to the filter of the present invention, since the spacers are arranged in a zigzag manner in the direction in which the planar portions are continuous, the spacers are positioned on the valley side where the planar portions are folded, and the amount of spacer (adhesive) used (necessary amount) ) And the structural pressure loss and wind passage resistance can be reduced.

  According to the filter of the present invention, the adjacent spacers are overlapped in the direction intersecting with the direction in which the plane portions are continuous, so even if the speed of the passing wind (wind speed) increases, Since the tip (bottom of the valley fold, both ends in the front-rear direction of the flat part) does not move in the direction in which the flat part continues, it is not necessary to fix the mountain fold part of the filter, and the flat part is flat in the direction in which the flat part continues. The part will not be crushed (compressed).

  According to the filter of the present invention, since the length in which the spacers overlap each other is set to 5 mm to 200 mm, both the front and rear ends of the plane portion can be reliably prevented from moving in the direction in which the plane portions are continuous. It is possible to reliably prevent the flat portion from being crushed in the direction in which the flat portions are continuous.

It is a perspective view which shows the structure of the filter which is one Example of this invention. It is a fragmentary sectional view by the XX line of FIG. It is a schematic diagram which shows an example of the manufacturing method (manufacturing apparatus) of the filter shown in FIG. It is explanatory drawing which shows the manufacturing process of the filter in the manufacturing method (manufacturing apparatus) of the filter shown in FIG. It is explanatory drawing which shows the manufacturing process of the filter in the manufacturing method (manufacturing apparatus) of the filter shown in FIG. It is the figure which compared the pressure loss of the filter shown in FIG. 1, and the conventional filter. It is the figure which compared the dust holding amount of the filter shown in FIG. 1, and the conventional filter.

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

  FIG. 1 is a perspective view showing the structure of a filter according to an embodiment of the present invention, FIG. 2 is a partial sectional view taken along line XX of FIG. 1, and the arrows in FIG. 1 indicate the direction of wind passing through the filter. Show.

  As shown in these drawings, the filter 11 secures an interval between the filter base 12 that is folded (folded) so that the plane portion 12a is continuous in a folding screen, and the plane portion 12a of the filter base 12; It is comprised with the spacer (adhesive) 13 which connects and fixes the plane parts 12a.

  The filter base 12 is made of, for example, a glass fiber nonwoven fabric, an electret-treated polypropylene fiber nonwoven fabric, or a polytetrafluoroethylene in which a breathable support material (organic fiber nonwoven fabric such as polyethylene or polyester) is laminated on at least one surface. Nonwoven fabrics of natural fibers such as porous membranes, pulp and hemp, and nonwoven fabrics of organic fibers such as polyester, polyethylene, and polypropylene can be used.

The flat portion 12a formed by bending the filter base 12 is formed in a rectangular shape having a height (folding height) H of, for example, 125 mm and a length L of, for example, 610 mm.
And the space | interval (space | interval of a mountain fold line) D of the plane part 12a is 10 mm, for example.

  The spacer (adhesive) 13 is used by forming a hot melt adhesive (hot melt adhesive) containing a thermoplastic resin such as a polyolefin resin or a polyamide resin into a linear shape or a rod shape.

  FIG. 3 is a schematic diagram showing an example of a manufacturing method (manufacturing apparatus) of the filter shown in FIG. 1, and FIGS. 4 and 5 are explanations showing a manufacturing process of the filter in the manufacturing method (manufacturing apparatus) of the filter shown in FIG. FIG.

  Next, an example of a method for manufacturing the filter 11 will be described with reference to FIGS.

  First, as shown in FIG. 3, the filter base 12A is pulled out from the raw fabric roll 21, and the slit base 23 cuts the filter base 12A into a width of 610 mm (a length corresponding to the length L in FIG. 1). The filter base 12 is made by dropping the ear of the filter base 12A.

  Then, the filter substrate 12 was folded by the folding blades 28A and 28B of the first folding portion 27 so that the flat surface portion 12a having a height (folding height) H was continuous in a zigzag pattern. Then, the filter base material 12 folded at, for example, 60 ° C. to 120 ° C. is heated by the first heating unit 30.

  Then, after the filter base material 12 folded in the development part 34 is once developed and returned to a flat shape, the spacer (adhesive) 13 is applied by the application nozzles 37A and 37B of the spacer application part 36 as shown in FIG. At predetermined locations on the front and back surfaces of the filter base 12 in the length direction (travel direction of the filter base 12) (locations where the spacer (adhesive) 13 is located on the valley side when the filter base 12 is folded) Apply (attach) several places (several lines).

  And after folding the filter base material 12 as shown in FIG. 5 along the line | wire (line) crooked by the 1st folding part 27 with the folding blades 42A and 42B of the 2nd folding part 41, it is 2nd By heating the spacer (adhesive) 13 to a temperature at which the spacer (adhesive) 13 is melted by the heating unit 44 to adhere the spacers (adhesive) 13 to each other, the filter 11A shown in FIGS. it can.

  In this way, when the spacer (adhesive) 13 is melted and the planar portions 12a are bonded to each other with the filter base material 12 folded, the spacer 13 expands, and as shown in FIGS. The spacer 13 is positioned on the valley side where the portion 12a is folded, the spacers 13 are arranged in a zigzag manner in the direction in which the planar portions 12a are continuous, and the adjacent spacers 13 intersect with the direction in which the planar portions 12a are continuous. overlap.

  Then, after the filter 11A is transported by the conveyor 46 and taken out, the depth (the length in the direction in which the planar portions 12a are continuous) can be cut into a predetermined length to form the filter 11.

  As described above, the length for applying the spacer 13 is changed depending on the height of the flat surface portion 12a.

In FIG. 3, 25A and 25B are first feed rollers, 32A to 32H are guide rollers, and 39A and 39B are second feed rollers.
In FIG. 4, Δ indicates a valley fold portion (valley fold line), and ▲ indicates a mountain fold portion (mountain fold line).

  The result of comparing the pressure loss between the filter of the present invention and the conventional filter (the filter described in Patent Document 1) is shown in FIG. 6, and the dust holding amount between the filter of the present invention and the conventional filter is shown in FIG. The comparison result is shown in FIG.

In FIG. 6, the horizontal axis indicates the wind speed (m / s), the vertical axis indicates the pressure loss (Pa), and both the horizontal axis and the vertical axis are logarithmic scales.
And the line A has shown the pressure loss with respect to the wind speed of the filter 11 of this invention, and the line B has shown the pressure loss with respect to the wind speed of the conventional filter.

In FIG. 7, the horizontal axis represents the dust holding amount (g), and the vertical axis represents the pressure loss (Pa).
And the line C has shown the pressure loss with respect to the dust holding amount of the filter 11 of this invention, and the line D has shown the pressure loss with respect to the dust holding amount of the conventional filter.
In the filter 11 of the present invention, the area of the filter medium used was 10 m ² .
In addition, the conventional filter has a filter medium area of 12 m ² .

As shown in FIG. 6, it can be seen that the filter 11 (line A) of the present invention has less pressure loss than the conventional filter (line B).
Thus, the pressure loss of the filter 11 of the present invention is smaller than that of the conventional filter because the spacer 13 is arranged on the valley side where the flat portion 12a is folded, and therefore the amount of the spacer 13 ( This is probably because the space between the flat portions 12a can be secured without increasing the width of the spacer 13 by the coating amount), that is, by reducing the ratio of reducing the effective filter medium area.

Further, since the spacer 13 is disposed on the valley side where the flat portion 12a is folded, the spacer 13 is not positioned on the mountain side where the flat portion 12a is folded, and the wind inlet portion is not blocked by the spacer 13. Wind can easily enter, and structural pressure loss can be reduced.
Thus, when the pressure loss and the structural pressure loss are reduced, dust can be efficiently collected as shown in FIG.

  Further, since the spacer 13 is arranged on the valley side where the flat portion 12a is folded, that is, the spacer 13 is arranged inside the mountain where the flat portion 12a is folded, the mountain folded portion is reinforced by the spacer 13. As a result, the mountain portion obtained by folding the flat surface portion 12a by the passing wind is not crushed, and the wind passage resistance does not increase.

  Further, even if the mountain fold side of the flat surface portion 12a tries to move in the direction in which the flat surface portion 12a continues due to an increase in the speed of the passing wind (wind speed), the adjacent spacers 13 intersect with the direction in which the flat surface portion 12a continues. By overlapping in the direction, the mountain fold side of the flat surface portion 12a does not move in the direction in which the flat surface portion 12a is continuous by the overlapping spacer 13, so that it is not necessary to fix the mountain fold portion of the filter 11 and the flat surface portion 12a is continuous. The plane portion 12a is not crushed in the direction (it is not compressed).

  In this way, the length of the overlap of the spacers 13 is only slightly so that the mountain fold side of the plane portion 12a may move in the direction in which the plane portions 12a are continuous. Therefore, the spacer 13 to be used is set to 5 mm to 200 mm. The both ends in the front-rear direction of the plane portion 12a can be reliably prevented from moving in the direction in which the plane portions 12a are connected while the plane portion 12a is connected in the direction in which the plane portions 12a are connected. It can prevent reliably that 12a is crushed.

In the above-described embodiment, as shown in FIG. 2, the example in which the spacer 13 is not provided at the bottom portion of the valley where the flat portion 12a is folded is shown, but the spacer is also provided at the bottom portion of the valley where the flat portion 12a is folded. By arranging 13, the flat portion 12 a can be reliably reinforced so as not to be crushed.
When the spacer 13 is also arranged at the bottom of the valley where the flat surface portion 12a is folded, the tip portion of the mountain where the flat surface portion 12a is folded is made an acute angle so as not to increase the wind passage resistance. Is desirable.

  Moreover, as shown in FIG. 4 and FIG. 5, the example in which the spacers (adhesive) 13 are applied to both sides of the inner side where the flat portion 12 a is valley-folded and the spacers 13 are bonded is shown. As long as (height) can be secured, the spacer 13 may be applied only to one side on the inner side where the flat portion 12a is folded.

  In addition, as shown in FIG. 4 and FIG. 5, the example in which the spacer (adhesive) 13 is continuously applied has been shown. However, if the amount (height) of the spacer 13 can be secured, the spacer 13 is formed in a dot shape. It may be applied discontinuously.

  Moreover, although the example which provided the 2nd heating part 44 between the 2nd folding part 41 and the conveyor 46 was shown, the position of the 2nd heating part 44 is not limited here, 2nd feed roller 39A, 39B and It may be provided between the second folding part 41. Further, by using a material having a long drying time for the spacer (adhesive) 13, it is possible to bond the spacers (adhesive) 13 to each other without providing the second heating unit 44.

DESCRIPTION OF SYMBOLS 11 Filter 11A Filter 12 Filter base material 12A Filter base material 12a Plane part 13 Spacer (adhesive)
DESCRIPTION OF SYMBOLS 21 Original fabric roll 23 Slitter 25A 1st feed roller 25B 1st feed roller 27 1st folding part 28A Folding blade 28B Folding blade 30 1st heating part 32A-32H Guide roller 34 Expanding part 36 Spacer application part 37A Application nozzle 37B Application nozzle 39A Second feed roller 39B Second feed roller 41 Second folding portion 42A Folding blade 42B Folding blade 44 Second heating portion 46 Conveyor H Height (folding height)
L length D interval (interval of mountain fold line)

Claims (4)

In the filter in which the filter substrate is folded so that the plane portions are connected in a folding screen, the interval between the plane portions is secured with a spacer, and the plane portions are connected and fixed with the spacer,
The spacer is disposed on the valley side where the plane portion is folded,
A filter characterized by that. The filter of claim 1,
The spacers are arranged in a zigzag manner in the direction in which the planar portions are continuous.
A filter characterized by that. The filter according to claim 1 or 2,
The adjacent spacers are overlapped with each other in a direction intersecting with the direction in which the planar portions are continuous,
A filter characterized by that. The filter according to claim 3.
The length in which the spacers overlap each other is 5 mm to 200 mm.
A filter characterized by that.

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