JP2015160198A - filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter capable of enhancing the rigidity thereof and elongating the lifetime of the filter while suppressing the rise of a pressure loss at a suction time.SOLUTION: A multilayer structure filter 1 has a multilayer structure including an internal layer 2 made of a nonwoven fabric, and outer layers 30 and 31 laminated on the surface and back of the internal layer 2. This internal layer 2 includes: first layers 40 and 41 of two or more layers having a predetermined thickness and a predetermined basis weight; and a second layer 50 made thinner than said first layers 40 and 41, having a high basis weight and laminated between the first layers 40 and 41. The outer layers 30 and 31 are made thinner than the first layers 40 and 41, have a high basis weight, and are laminated on the outer surfaces of the first layers 40 and 41 thereby to form the surface and back of the internal layer 2.

Description

  The present invention relates to a disposable filter while capturing water vapor, oily smoke, dust, dust and the like.

  While collecting water vapor, oil smoke, dust, dust and the like, the disposable filter is composed of two surface layers and an intermediate layer interposed between the surface layers as described in Patent Document 1 below. Three-layer filters with layers are known.

  In this filter, the surface layer and the intermediate layer are composed of a nonwoven fabric made of glass fibers, the basis weight of the nonwoven fabric of the intermediate layer is lower than the basis weight of the nonwoven fabric of the surface layer, and the thickness of the nonwoven fabric of the intermediate layer is the surface layer It is thicker than the thickness of the nonwoven fabric.

JP 2002-136814 A

  According to the prior art of Patent Document 1, since the intermediate layer is a coarse low-weight layer and the surface layer is a fine high-weight layer, the appearance is good and a cheap impression is not received. Further, since the surface layer is a high basis weight layer, the constituent fibers are not easily dropped off, the handling property is excellent, and the steam resistance is also good. In addition, since the intermediate layer is a low-weight layer with a coarse mesh, an increase in pressure loss can be prevented, and the combination of a coarse low-weight layer and a fine high-weight layer provides a wide range of sizes. Particles can be collected efficiently.

  The filter according to the prior art of Patent Document 1 will be replaced with a new filter when the amount of collected water vapor, oil smoke, dust, dust, etc. (hereinafter referred to as a collected material) reaches a limit amount. Depending on the usage status of the filter, the replacement frequency of the filter becomes high, so that it has been required to extend the life of the filter.

  Further, since the filter is composed of a nonwoven fabric made of glass fiber, the rigidity is low, and there is a high possibility of damage such as bending or deformation during mounting.

  In order to increase the rigidity, it is conceivable to increase the thickness of the entire filter or increase the thickness of the surface layer. However, there is a limit to the thickness that can be used for a range hood, a ventilation fan, etc., and ensuring the collection efficiency. Therefore, this method has its limits.

  This invention makes it an example of a subject to cope with such a problem. That is, while suppressing an increase in the pressure loss of the filter, ensuring the necessary collection efficiency, and increasing the rigidity of the filter within the range of the thickness used for a normal range hood, ventilation fan, etc., the life of the filter It is an object of the invention to extend the length.

  In order to achieve such an object, the filter according to the present invention has at least the following configuration.

  A multi-layered filter comprising an inner layer made of a nonwoven fabric and an outer layer made of a nonwoven fabric and laminated on the front and back of the inner layer, the inner layer having a predetermined thickness and a predetermined basis weight and two or more first layers A second layer laminated between the first layers, the outer layer being thinner than the first layer and having a higher basis weight, the inner layer It is laminated | stacked on the outer surface of said 1st layer used as the front and back of this.

  By having such characteristics, the present invention has the following effects. That is, a filter having a multilayer structure comprising an inner layer made of nonwoven fabric and an outer layer made of nonwoven fabric and laminated on the front and back of the inner layer, wherein the inner layer has a predetermined thickness and a predetermined basis weight of two or more first layers And a second layer laminated between the first layer, and the outer layer is thinner than the first layer and has a high basis weight, Since the filter is characterized in that it is laminated on the outer surface of the first layer that is the front and back of the inner layer, while suppressing an increase in the pressure loss of the filter, ensuring the required collection efficiency, and normal Within the thickness range used for a range hood, a ventilation fan, etc., the rigidity of the filter can be increased and the life of the filter can be extended.

It is a perspective view of the filter of a first embodiment concerning the present invention. FIG. 2 is a sectional view taken along line (2)-(2) in FIG. 1. It is sectional drawing of the filter of 2nd embodiment which concerns on this invention.

  The inner layer preferably includes two layers of the first layer and one layer of the second layer.

  Moreover, it is preferable that all said 1st layers are the same thickness and the same fabric weight.

  Moreover, it is preferable that all of the said outer layer and said 2nd layer are thickness and the same fabric weight.

  However, in the present invention, all or a part of the first layer has different thicknesses and different weights, and all or a part of the outer layer and the second layer have different thicknesses and different weights. It does not prevent it.

  The filter referred to in the present invention is suitable for a filter for a kitchen range hood or a ventilator with a large amount of collected matter, but can also be used as a filter for an industrial or industrial ventilator or an air purifier. it can.

  Hereinafter, the filter 1 of 1st embodiment which concerns on this invention is demonstrated based on FIG.1 and FIG.2. Note that the embodiments described below do not limit the present invention.

  The filter 1 includes an inner layer filter portion 2 that constitutes an inner layer of the filter 1 and outer layer filter portions 30 and 31 that constitute an outer layer of the filter 1.

  The inner layer filter unit 2 includes first layers 40 and 41 stacked on the outer layer filter units 30 and 31, respectively, and a second layer 50 stacked between the first layers 40 and 41. .

  That is, the filter 1 has a five-layer structure including two outer layer filter portions 30 and 31, two first layers 40 and 41, and one second layer 50.

  This filter 1 has a thickness corresponding to a normal range hood or a ventilation fan, specifically, a thickness of 10 mm to 30 mm, and a thickness suitable for the size and suction capacity of the range hood or the ventilation fan. You can choose one.

  Moreover, although the filter 1 is shape | molded by the front square shape in illustration, the thing of the shape which adapts according to the shape of a range hood or a ventilation fan can be selected for the front shape of the filter 1.

  The outer filter sections 30, 31, the first layers 40, 41, and the second layer 50 are each formed into a mat shape having a predetermined identical shape (front square in the drawing) using a glass fiber nonwoven fabric. .

  The outer layer filter portions 30 and 31 and the second layer 50 are formed such that the nonwoven fabric has the highest basis weight and the smallest thickness among the layers of the filter 1, and the first layers 40 and 41 have the basis weight of the nonwoven fabric. Is lower than the outer layer filter portions 30 and 31 and the second layer 50, and is formed to be thicker.

  Moreover, the outer layer filter parts 30 and 31 and the second layer 50 have substantially the same basis weight and the same thickness as each other nonwoven fabric, and the first layers 40 and 41 have substantially the same basis weight as each other nonwoven fabric, And it is made the same thickness.

  The outer layer filter portions 30 and 31 and the second layer 50 preferably have a thickness of 0.1 mm to 2.0 mm, and the first layers 40 and 41 preferably have a thickness of 2.0 mm to 27.7 mm. The thicknesses of the outer layer filter portions 30 and 31 and the first layers 40 and 41 and the second layer 50 can be selected so that the filter 1 has a thickness in the above-described range.

Basis weight of the nonwoven fabric of the outer layer filter portions 30 and 31, and the second layer ^{50, 10g / m 2 ~250g / m} 2, the basis weight of the nonwoven fabric of the first layer 40, 41, 5.0g / m ² ~180g / m ² is preferable, and in this range, the basis weight of each of the nonwoven fabrics of the outer layer filter portions 30 and 31, the first layers 40 and 41, and the second layer 50 can be selected.

  By laminating the inner layer filter portion 2 and the outer layer filter portions 30 and 31 as shown in the figure, the filter 1 has the outer layer filter portion 30 and the first layer 40 on one side with the second layer 50 as a boundary. The first filter unit 5 is configured, and the second filter unit 6 is configured by the outer layer filter unit 31 and the first layer 41 on the other side.

  Moreover, the 1st filter part 5 and the 2nd filter part 6 are mutually provided with the same structure (mesh and thickness of a nonwoven fabric) as mentioned above, and when attaching to a range hood or a ventilation fan, a collection thing is Even if the first filter part 5 or the second filter part 6 is directed to the upstream side (outside of the range hood or the ventilation fan) in the suction direction of the contained gas, the collecting function and the collecting effect of the collected matter are the same. Can be demonstrated.

  When the first filter portion 5 is directed upstream in the suction direction and the gas containing the collected matter is sucked, the collected matter contained in the gas sucked by the suction force of the range hood or the ventilation fan is removed. The outer layer filter unit 30 and the first layer 40 can collect and filter the gas.

  The gas passes through the second layer 50, the first layer 41, and the outer layer filter unit 31 in that order, and is exhausted. On the other hand, the collected matter is extracted from the first filter unit 5 (the outer layer filter unit 30 and the first layer 40. ) And the remaining collected matter that could not be collected by the first filter unit 5 is collected by the second layer 50 or a part of the collected product flows into the second filter unit 6. Is blocked, the inflow of the collected material into the second filter unit 6 is limited.

  That is, the inflow of the collected matter into the second filter portion 6 is gradually performed as the continuously sucked gas passes through the second layer 50, but is a high basis weight layer. Since the second layer 50 restricts the inflow of the collected matter to the second filter portion 6, the amount of the collected matter flowing from the first filter portion 5 to the second filter portion 6 is extremely small. can do.

  Thereby, the inflow amount of the collected matter from the first filter portion 5 to the second filter portion 6 at the time of sucking the gas can be suppressed, thereby preventing the collected matter from flowing out into the range hood or the ventilation fan. At the same time, it is possible to reduce the adhesion of dirt in the range hood, the fan of the ventilation fan and the inside.

  Moreover, by the restriction | limiting of the inflow to the 2nd filter part 6 of the collection thing by the 2nd layer 50, the collection amount of the collection thing in the 1st filter part 5 can be increased, Thereby, a 1st filter part The maximum collection capacity of 5 can be used.

  The collected matter collected by the first filter unit 5 is held by the nonwoven fabric of the outer layer filter unit 30, the first layer 40, and the second layer 50 in a state where the suction of gas is stopped, and the nonwoven fabric. Since the backflow of the collected matter is prevented by the outer layer filter portion 30 having a high basis weight, it is possible to prevent the collected matter from flowing out from the first filter portion 5 in the state where the suction of the gas is stopped. .

  When the collection capacity of the first filter unit 5 reaches its limit, the filter 1 is turned over and attached to a range hood or a ventilation fan so that the second filter unit 6 faces the upstream side in the suction direction. It is also possible to collect the collected matter by the second filter unit 6.

  The collected matter collected by the second filter portion 6 is held by the nonwoven fabric of the outer layer filter portion 31, the first layer 41, and the second layer 50 in a state where the suction of gas is stopped, and the nonwoven fabric. Since the outer layer filter part 31 having a high basis weight prevents the collected matter from flowing backward, it is possible to prevent the collected substance from flowing out from the second filter part 6 in a state where the suction of the gas is stopped. .

  Further, when the second filter unit 6 is directed upstream in the suction direction, the second layer 50 prevents the collected matter collected by the first filter unit 5 from flowing back to the second filter unit 6. be able to.

  In the above description, the filter 1 is mounted in the order of mounting from the first filter unit 5 toward the upstream side in the suction direction. However, the filter 1 is separated from the first filter unit 5 with the second layer 50 as a boundary. Since the second filter unit 6 has the same structure, when the filter 1 is mounted, it is mounted from the first filter unit 5 or the second filter unit 6 toward the upstream side in the suction direction. Moreover, the same collection effect can be obtained.

  The filter 1 includes a second layer 50 disposed in the innermost layer of the filter 1, and the second layer 50 is formed by a first filter unit 5 having a two-layer structure of a first layer 40 and an outer layer filter unit 30, and a first layer 50. Since it has a five-layer structure configured to be sandwiched between the layer 41 and the second filter part 6 having a two-layer structure of the outer layer filter part 31, it has high rigidity.

  That is, since the innermost second layer 50 also functions as a core (core material) of the filter 1 for ensuring the rigidity of the filter 1, it is normally used as described above without increasing the thickness of the filter 1. Sufficient rigidity can be given to the filter 1 within the thickness range.

  Next, the performance of the filter 1 will be described based on the test results. Here, the form of the filter 1 used is shown in Table 1 below.

  Here, the numerical values of the thicknesses of the filter 1, the outer layer filter portions 30 and 31, the first layers 40 and 41, and the second layer 50 are average values obtained by measuring the thicknesses at 10 different places.

  Here, the numerical values of the basis weights of the outer layer filter portions 30 and 31, the first layers 40 and 41, and the second layer 50 are average values obtained by measuring the basis weights at 10 different places.

  Since the outer layer filter parts 30, 31, the first layers 40, 41, and the second layer 50 are made of nonwoven fabric, the outer layer filter parts 30, 31, the first layers 40, 41, and the second layer 50 are combined. In addition, it is extremely difficult to obtain the same thickness and the same basis weight over the entire region, and it is inevitable that a site having a different thickness is generated and a site having a different basis weight is generated depending on the fiber amount of the nonwoven fabric.

  That is, the thickness and basis weight of the outer layer filter portions 30 and 31 shown in [Table 1], the thickness of the outer layer filter portions 30 and 31 and the second layer 50, and the basis weight, the thickness of the first layers 40 and 41, and the basis weight. The difference between the average values in the filter 1 is an acceptable range of error in the filter 1 product, and the outer layer filter portions 30 and 31 and the second layer 50 have substantially the same thickness and the same basis weight. The layers 40 and 41 have the same thickness and the same basis weight.

  For this reason, the average value was employ | adopted for the thickness of the filter 1 in the performance test of the filter 1, the inner layer filter part 2, the first layers 40 and 41, the outer layer filter parts 30 and 31, and the numerical value of a fabric weight.

  The performance test of the filter 1 includes (1) the pressure loss of the filter 1 [Table 2], (2) the collection rate of the collected material of the filter 1 [Table 3], and (3) the bending resistance of the filter 1 [Table 4]. ] Was performed in three types.

(1) Pressure loss test of filter 1 As shown in [Table 2], the pressure loss of filter 1 is the pressure loss at wind speed (m / s) 0.5, 1.0, 1.2, and 1.5. Was measured 30 times, and the average value was calculated.

  In general, if the pressure loss is 20.0 Pa or more, a large load is applied to the fan of the range hood or the ventilation fan, and if it is 5.0 Pa or less, the collected matter easily passes through and the collection efficiency is lowered. ing.

  That is, the pressure loss of the filter 1 is 18.5 Pa at the highest wind speed of 1.5 m / s as judged from the result (average value) of [Table 2], so a large load is applied to the fan of the range hood and the ventilation fan. The gas can be sucked without applying.

  Further, the pressure loss at the lowest wind speed of 0.5 m / s is 5.0 Pa, and this numerical value is a numerical value that makes it easy for the collected matter to pass through and lowers the collection efficiency. Since the fine collected matter is collected by the inner layer filter portion 2 and the outer layer filter portions 30 and 31 having a high basis weight of the nonwoven fabric, even when the pressure loss is low, the collection rate of the collected matter does not decrease.

(2) Collection rate test of the collected matter of the filter 1 As shown in [Table 3], the collection rate of the collected matter of the filter 1 was measured as a collection rate when the collected matter was oil smoke. . Specifically, the filter 1 was attached to the range hood with the frame mounted, and the collection rate when sucked at a wind speed of 0.8 to 1.5 m / s for 30 minutes was measured.

  Moreover, the same thickness as the filter 1, the same thickness as the outer layer filter parts 30 and 31 of the filter 1 and the basis weight of the same nonwoven fabric, and the same nonwoven fabric as the first layers 40 and 41 of the filter 1 The collection rate of a filter having a three-layer structure having an intermediate-layer filter portion as a basis weight was also measured under the same conditions as the filter 1.

  In this test, as shown in [Table 3], although the collection rate of the filter 1 was a five-layer structure, the result was higher than that of the three-layer structure filter.

  According to this test result, it is effective to collect the collected matter by the outer layer filter portions 30 and 31 and the second layer 50 having a high basis weight of the nonwoven fabric, and the first layers 40 and 41 having a low basis weight of the nonwoven fabric. It has been proved that the filter 1 having the configuration can secure the collection rate of the collected matter even when the pressure loss is low.

(3) Bending test of filter 1 The bending resistance of the filter 1 was measured using a sample formed by cutting the filter 1 shown in [Table 1] into the size shown in [Table 4]. Two types of samples were used, one having a surface coated with a flame retardant (sample 1) and one not coated with a flame retardant (sample 2).

  In addition, in this test, a conventional filter having a three-layer structure used as a comparison target in the above-mentioned (2) collection rate test of the collected matter of the filter 1 is shown in Table 4 as a comparison target. Two types of sample 3 (applied with flame retardant) and sample 4 (not applied with flame retardant) formed by cutting into the same size as samples 1 and 2 were used.

  In the test in [Table 4], using the samples 1 to 4, the Gurley stiffness test was performed 30 times each to obtain the average value of the scale values of the samples 1 to 4, and the average of the scale values. The bending resistance of samples 1 to 4 was obtained from the measured values. (ASTM D6125-1997 Gurley Flexibility Test)

  In this test, as shown in [Table 4], in the comparison of the bending resistance between the sample 1 and the sample 3, and in the comparison of the bending resistance between the sample 2 and the sample 4, both of the samples 1 and 2 The result that the bending resistance greatly exceeded the bending resistance of Sample 3 and Sample 4 was obtained.

  According to this test result, the filter 1 is arranged in a five-layer structure by arranging the second layer 50 in the innermost layer of the filter 1 so that the flame retardant is applied or not applied. It has been proved that the rigidity under the same conditions is extremely high as compared with a conventional filter having a three-layer structure.

  As described above, since the filter 1 having the five-layer structure has a pressure loss of less than 20.0 Pa at the maximum, the collected matter is collected so as not to apply a large load to the fan of the range hood or the ventilation fan. In addition, although the pressure loss is 5.0 Pa, which is assumed to decrease the collection rate with a minimum pressure loss, even with such a low pressure loss, without reducing the collection rate of the collected matter, The collected material can be collected efficiently.

  Further, the filter 1 suctions gas toward the upstream side in the suction direction alternately one side of the first filter part 5 and the second filter part 6 with the innermost filter part 2 as the boundary, Since the collected material can be collected, when the collected amount of one collected material reaches the limit, by turning the filter 1 upside down and mounting the other toward the upstream side in the suction direction, The gas can be sucked again and the collected matter can be collected.

  In addition, the filter 1 has a five-layer structure by the innermost filter section 2 and has the same thickness as the three-layer filter and has high rigidity, so the same frame as the three-layer filter, The same range hood and ventilation fan can be used, and in addition, deformation when the filter 1 is attached or when gas is sucked can be suppressed.

  Therefore, the filter 1 can increase the life of the filter 1 and reduce the replacement frequency of the filter 1 while suppressing an increase in pressure loss at the time of suction, and can improve durability by high rigidity.

  In addition, the conventional filter is bent at the time of mounting, and it takes time to mount the filter. However, in the filter 1 in this embodiment, it is difficult to bend by suppressing deformation due to high rigidity. In addition, the mounting speed is greatly improved, and in addition, damage due to bending during mounting can be prevented.

  Next, a second embodiment of the filter 1 'will be described with reference to FIG. In addition, description about the site | part which overlaps with 1st embodiment is abbreviate | omitted by attaching | subjecting the same code | symbol.

  The filter 1 ′ has the same thickness and the same weight as the three layers of the first layers 40, 41, and 42, and the outer layer filter portions 30 and 31, the inner layer filter portion 2 having the same thickness and the same weight. It has a seven-layer structure composed of two second layers 50 and 51 which are thinner than 40, 41 and 42 and have a high basis weight.

  The second layer 50 is laminated between the first layers 40, 41, and the second layer 51 is laminated between the first layers 41, 42, whereby the outer layer filter unit 30 to the outer layer filter unit 31. The first layer 40, 41, 42 and the second layer 50, 51 can be formed as a filter 1 ′ alternately stacked.

  Further, the filter 1 ′ includes a first filter portion 5 composed of an outer layer 30 and a first layer 40, and a second filter portion 6 composed of an outer layer 31 and a first layer 41. Between the one filter part 5 and the second filter part 6, a third filter part 7 comprising a second layer 50, 51 and a first layer 41 disposed between the second layer 50, 51 is provided. Yes.

  When such a filter 1 ′ is mounted with the first filter portion 5 facing upstream in the gas suction direction, the first filter is used to collect the collected matter contained in the gas sucked by the suction force of the range hood or the ventilation fan. Part (outer layer filter unit 30 and first layer 40) 5 can collect and filter the gas.

  The gas passes through the third filter part (first layer 41 and second layers 50 and 51) 7 and the second filter part (outer layer filter part 31 and first layer 42) 6 in this order, and is exhausted. On the other hand, the collected matter is collected by the first filter unit 5 and the remaining collected matter that could not be collected by the first filter unit 5 is collected by the third filter unit 7. The inflow of the collected matter into the second filter unit 6 can be restricted.

  Furthermore, the remaining collected matter that could not be collected by the first filter unit 5 and the third filter unit 7 is collected from the second filter unit 6 by the second filter unit 6 to the outside (range hood or It is possible to limit the outflow of collected matter to the inside of the ventilation fan.

  That is, the inflow of the collected matter into the third filter part 7 and the second filter part 6 is gradually caused by the continuously sucked gas passing through the second layers 50 and 51 and the first layer 40. However, the second layer 50, which is a high basis weight layer, restricts the inflow of the collected matter into the third filter portion 7, and the second layer 51, which is also a high basis weight layer, is the second filter. Since the inflow of the collected matter to the portion 6 is restricted, the amount of the collected matter flowing from the first filter portion 5 to the third filter portion 7 and the second filter portion 6 should be extremely small. Can do.

  Further, when the amount of collected matter in the first filter part (one side) 5 reaches a limit, the filter 1 is turned over and the second filter part (the other side) 6 is mounted toward the upstream side in the suction direction. Thus, the gas can be sucked again and the collected matter can be collected.

  As a result, the filter 1 ′ can be expected to have the same action and effect as the filter 1, and further, the second layer 50, 51 of two layers can be expected to improve the rigidity of the filter 1 ′. Therefore, improvement in the collection efficiency of the collected material can be expected.

  In addition, the thickness of the filter 1, the outer layer filter parts 30 and 31, the first layers 40, 41, and 42, and the second layers 50 and 51 illustrated and the basis weight are not limited to those illustrated, and are within the above-described preferable range. And the fabric weight of the nonwoven fabric of the 1st layers 40, 41, and 42 can be arbitrarily determined in the form lower than the outer layer filter parts 30 and 31 and the 2nd layers 50 and 51.

1: Filter 1 ': Filter 2: Inner layer filter section (inner layer)
30: Outer filter part (outer layer)
31: Outer filter part (outer layer)
40: First layer 41: First layer 42: First layer 50: Second layer 51: Second layer

Claims (4)

A multilayer filter comprising an inner layer made of nonwoven fabric and an outer layer made of nonwoven fabric and laminated on the front and back of the inner layer,
The inner layer includes a first layer of two or more layers having a predetermined thickness and a predetermined basis weight, and a second layer that is thinner than the first layer and has a high basis weight and is laminated between the first layers. ,
The outer layer is thinner than the first layer and has a high basis weight, and is laminated on the outer surface of the first layer which is the front and back of the inner layer.   The filter according to claim 1, wherein the inner layer includes two first layers and one second layer.   The filter according to claim 1, wherein all of the first layers have the same thickness and the same basis weight.   The filter according to any one of claims 1 to 3, wherein all of the outer layer and the second layer have the same thickness and the same basis weight.

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