JPH06218210A - Filter material for vacuum cleaner dust bag - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a filter material with lower pressure loss, higher dust collection, strength and flexibility than conventional filter materials, and a collection of high-power vacuum cleaners with a suction work rate of 300 to 400W. Applicable to dust bags. [Structure] The base paper wet-paper-made in one or two layers with less fiber than the conventional filter material and more synthetic fibers and synthetic binder fibers and micro glass fibers is impregnated with emulsion type binder. Filter material consisting of [Effect] A filter material with low pressure loss, high dust collection, strength and flexibility can be obtained, and as a dust bag for a high-power vacuum cleaner, there is no problem with suction work rate, dust collection direction ratio, opening, and bag tearing. It came to dust.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has a suction power of 300 to 40.
The present invention relates to a low pressure loss, high dust collection, and high strength filter material applicable to a dust collection bag of a 0 W high-power vacuum cleaner.

[0002]

2. Description of the Related Art Filter materials used in conventional vacuum cleaner dust collection bags include plant fibers such as hemp pulp, wood pulp and esparto pulp, recycled fibers such as rayon fibers, synthetic fibers such as vinylon fibers and polyester fibers, PVA fiber,
Synthetic binder fibers such as polyester binder fibers, and micro glass fibers are mixed at an appropriate ratio and wet papermaking is performed to provide sufficient strength, appropriate air permeability as a filter, and dust collection efficiency.

However, recent vacuum cleaner models of various manufacturers have developed a very high-power model with a suction power of 300 to 400 W, which is much higher than the conventional model of 200 W. This high-power model is becoming mainstream. This high power model is
Along with the improvement of the suction work rate, that is, the suction force, a high level of dust collection performance is required. When the conventional vacuum cleaner dust bag is used for a high-power model, there are many initial leaks, that is, dust inside the vacuum cleaner body is conspicuous at the time when about 20 g of dust is absorbed, and the air permeability is insufficient, The suction power does not reach 300 W due to high pressure loss, it does not swell even when receiving wind due to low flexibility of paper quality, that is, so-called poor opening, dust collection capacity is insufficient, paper quality is low elongation and high power It has the inconvenience of being easily broken when exposed to wind. In order to be applicable as a vacuum cleaner dust collection bag of a high-power model, so-called low pressure loss and high dust collection filter performance with less air resistance and excellent trapping of fine dust, and bag opening There is now a demand for a filter material that is good and has a property that the bag does not easily tear.

In order to make the above-mentioned dust bag having a low pressure loss and a high dust collecting efficiency, the filter material does not hinder the passage of air even with a considerably large air volume, that is, it has good air permeability. Further, it is necessary to simultaneously satisfy two mutually contradictory requirements that a large number of pores having extremely fine voids are present in the paper layer in order to capture ultrafine dust without leaking to the air discharge side. In order to satisfy these two requirements, as seen in the description of JP-A-62-191015, fibers contributing to the direction of improving air permeability, for example, synthetic fibers having no hydroxyl group such as polyester fibers, and dust collecting property. Since it is necessary to add a considerably larger amount of micro glass fiber than the conventional product in order to increase the amount, the amount of fiber that gives strength such as hemp pulp or wood pulp is significantly reduced. Since the strength is also required to be higher than that of conventional products, it is not possible to provide sufficient strength as a dust bag if the quality is designed so that both the pressure loss and the dust collection efficiency have satisfactory values. Therefore, it has not been possible to provide a dust bag filter material applied to an electric vacuum cleaner having a suction work rate of 300 to 400 W, only by a combination of fibers which has been used conventionally.

[0005]

As described above, the present invention enables a balanced quality of low pressure loss, high dust collection, and high strength, which cannot be achieved by the conventional techniques alone, and the suction work is performed. A filter material for a dust collecting bag applicable to an electric vacuum cleaner having a rate of 300 to 400 W.

[0006]

According to the present invention, a sheet composed of one layer or two layers of plant fiber, synthetic fiber, synthetic binder fiber, and micro glass fiber is impregnated with an emulsion type binder. A filter material for a dust collecting bag, which is characterized in that The details will be described below.

In the present invention, wood pulp is used as the plant fiber,
A fiber sheet is once formed by using hemp pulp, polyester fibers and vinylon fibers as synthetic fibers, polyester binder fibers as synthetic binder fibers, PVA fibers, and micro glass fibers having a fiber diameter of 1 μm or less. In the present invention, polyester fibers and polyester binder fibers are blended in a larger amount than conventional filter materials to improve air permeability,
The amount of micro glass fiber added to the filter material is higher than that of the conventional filter material to improve the dust collecting property, and the content of fibers that contribute to the strength of wood pulp, hemp pulp, etc. is reduced, and polyester fiber or micro glass fiber contributes to the strength. Therefore, the present invention provides a filter material for a dust bag having a low pressure loss, high dust collection, and high strength by impregnating a binder to have strength.

The fibers used in the present invention will be described. Wood pulp and hemp pulp give strength to the fiber sheet. Since hemp pulp is superior to wood pulp in both air permeability and strength, use hemp pulp when low pressure loss or high strength is required. . Manila hemp thermo-mechanical pulp (hereinafter abbreviated as TMP) is preferable as the hemp pulp, and NBKP is preferable as the wood pulp to impart strength.
Vinylon fibers and PVA fibers are blended only when particularly strong strength is required. As the PVA fiber, a fully melted type having a melting point of 60 to 70 ° C. is used. The PVA fiber melts and bonds the vinylon fiber and other fibers together, and the fiber sheet is reinforced by the binder effect of the PVA fiber and the strength of the vinylon fiber itself. The polyester binder fiber has a core-sheath structure in which the core is polyester and the outside is modified polyester, and the modified polyester on the outside has a melting point of 110 ° C. and 200 ° C.
There are types. The former is melted in the papermaking process, and the latter is melted in the processing process. By melting the sheath portion of the polyester binder fiber, the polyester fiber and other fibers are bonded. Regarding the fineness, the micro glass fiber is 1 μm or less,
Polyester fiber is 5 to 15 μm (0.5 to 2 denier), polyester binder fiber is 15 to 20 μm
(2-4 denier), 10 for vinylon fiber and PVA fiber
˜15 μm (1-2 denier). After the polyester binder fiber is melted, only the core portion remains, so that the cross-sectional area becomes about half and the fineness becomes 10 to 15 μm (1 to 2 denier). The polyester fibers and the polyester binder fibers after melting are blended with different fineness so that the fineness is in the range of 5 to 15 μm and three levels at equal intervals. In this way, the polyester fibers having different fineness are combined to complicate the cavities of the filter material and facilitate the capture of dust. The fiber length is preferably in the range of 3 to 7 mm in terms of paper-making property.

The type of binder used in the present invention is an acrylic type, an ethylene vinyl acetate type copolymer, an ethylene vinyl chloride type copolymer or the like, which is an emulsion type and does not form a large film, and has appropriate flexibility and strength. It is also preferable that they have both properties and have a good compatibility with the adhesive used for bag making, and the kind of the binder is not particularly limited. The glass transition point of the binder changes the flexibility of the filter material. The flexibility of the filter material affects pressure loss and dust collection efficiency, so it is necessary to select a binder having an appropriate glass transition point. In order to reduce the pressure loss, the air resistance is reduced. Therefore, it is better that the filter material is flexible, and thus a binder having a low glass transition point is used. In order to improve the dust collection efficiency, it is necessary to suppress the leakage of dust caused by the dust bag expanding by the wind and opening the eyes. The filter material should be hard, so a binder with a high glass transition point should be used. .

The method of impregnating the binder of the present invention is
The impregnation method using a tab size roll is generally used, but the method is not particularly limited. Regarding the drying after the impregnation, it is preferable to finish it in a porous manner with a hot air dryer in order to maintain the voids of fine pores due to the micro glass fiber.

The paper layer of the filter material of the present invention has a two-layer structure or a one-layer structure. In the case of a two-layer structure, a dust layer (hereinafter abbreviated as DS) that is an inlet side of air containing dust when used as a dust bag and a clean layer (hereinafter abbreviated as CS) that is an outlet side. Composed of layers. Since DS captures most of the dust, it is necessary to open the eyes and improve air permeability, and a fiber having a relatively large fineness is blended. C
Since S captures extremely fine dust of 2 μm or less, it is necessary to close the eyes, and fibers having a small fineness such as micro glass fibers are mixed to form a fine void structure. Although the conventional filter material also has a two-layer structure, the present invention is different from the conventional filter material in that the blending amount of the synthetic fiber and the micro glass fiber is large. The ratio of the basis weights of DS and CS is not particularly limited, but the ratio may be determined so that the compounding amount of the microglass fiber with respect to the entire sheet is an appropriate value. That is, when the ratio of CS is increased, the amount of microglass fiber mixed in the entire sheet is increased and the dust collection efficiency is increased, while on the other hand, DS is reduced and clogging increases pressure loss, so that the balance between dust collection efficiency and pressure loss is increased. Determine the ratio so that By having both DS and CS functions in one layer, increasing the amount of micro glass fiber compounded,
The one having a single-layer structure of the present invention has a high dust collection efficiency. Alternatively, the sheet may be composed of two layers, and the fiber composition of each layer may be the same as that of the one-layer structure of the present invention for papermaking.

The two-layer filter material of the present invention comprises 50 to 60% by weight of vegetable fiber, 30 to 40% by weight of synthetic fiber,
DS consisting of 10 to 15% by weight of synthetic binder fiber, 30 to 40% by weight of plant fiber, 30 to 50% by weight of synthetic fiber,
First, a fiber sheet is composed of two layers of CS composed of 10 to 15% by weight of synthetic binder fiber and 8 to 16% by weight of micro glass fiber. The ratio of the basis weights of the two layers may be determined so that the microglass fiber is 4 to 7% by weight with respect to the basis weight of the filter material. If it is less than 4% by weight, the dust collection efficiency will not be achieved, and if it is more than 7% by weight, clogging will occur and pressure loss will increase, which is not preferable. If the ratio of the basis weight of the two layers is such that DS is 50 to 60% by weight and CS is 40 to 50% by weight, the amount of microglass fibers is 4 to 7% by weight, and the dust collection efficiency is appropriate. The size of DS is also large enough to reduce the pressure loss. When the vegetable fiber of DS is less than 50% by weight, the strength is insufficient, which is not preferable, and when it is 60% by weight or more, clogging occurs and pressure loss becomes high, which is not preferable. DS synthetic fiber 3
If it is less than 0% by weight, the polyester fiber becomes insufficient, the air permeability is lowered, the flexibility is lost, and the opening is deteriorated, which is not preferable. If the synthetic fiber content is 40% by weight or more, the amount of the plant fiber or the synthetic binder fiber is insufficient, resulting in insufficient strength, which is not preferable. DS synthetic binder fiber 1
If it is less than 0% by weight, it will be insufficient for adhering the polyester fiber or the vinylon fiber, which is not preferable. If the synthetic binder fiber content is 15% by weight or more, the melted portion of the fiber will close the eyes, resulting in high pressure loss, which is not preferable. CS
With respect to the above, the range of the compounding amounts of the plant fiber, the synthetic fiber and the synthetic binder fiber was limited in the same way. Regarding the fineness, it is necessary to make CS small, so that polyester fibers having a fineness of 5 to 10 μm (0.4 to 0.6 denier) should be mainly used to close the eyes. Since the strength, dust collection efficiency, and pressure loss are balanced depending on the ratio of the fiber mixture in each layer, it is not preferable to deviate from the above range.

The basis weight of the two-layer filter material fiber sheet of the present invention is 35.0 to 49.0 g / m ² . Three
When the amount is 5.0 g / m ² or less, the strength as a filter material is reduced, and the thickness is also reduced to reduce the dust collection capacity, which is not preferable. When it is 49.0 g / m ² or more, the thickness is increased and the air permeability is lowered, which is not preferable.

The two-layer filter material of the present invention is obtained by impregnating an emulsion type binder having a glass transition point of 0 ° C. or higher with 11 to 18% by weight based on the weight of the fiber sheet.
An emulsion type binder having a glass transition point of 0 ° C. or lower is too soft, so that the filter material becomes soft, and when the bag is used as a dust bag, it stretches greatly due to the wind, and eyes open and dust leaks, which is preferable. Absent. If the amount of emulsion type binder attached is less than 11% by weight,
The dust collection bag does not have sufficient strength and is easy to tear during suction with an electric vacuum cleaner. In addition, the strength is weak and elongation is large. Is reduced, which is not preferable. If it is more than 18% by weight, the binder tightens the sheet in the Z direction,
It is not preferable because the voids between the fibers are crushed and the eyes are clogged, the space for capturing the dust is reduced, and the air permeability and the dust collection efficiency are adversely affected.

The Frazier air permeability of the two-layer filter material of the present invention is 10 according to the measuring method of JIS L1096.
cc / cm ² / s or more. The measurement method of the Frazier air permeability according to JIS L1096 is to obtain the air amount cc / cm ² / s when the differential pressure before and after the orifice is adjusted to 0.5 inch H ₂ O. The pressure difference before and after the orifice here is the pressure loss, and the principle of measuring the Frazier air permeability is to measure the amount of air when the pressure loss is constant. on the other hand,
The principle of pressure loss measurement is to measure the pressure loss when the amount of air is constant. That is, since the pressure loss and the Frazier air permeability show an inversely proportional relationship, a proper pressure loss value can be obtained if the Frazier air permeability of the filter material is an appropriate value. The higher the Frazier air permeability, the lower the air resistance, the lower the pressure loss, and the larger the air volume of the electric vacuum cleaner, so the suction power can be increased. In the present invention, micro glass fibers having a fiber diameter of 0.5 to 1.0 μm are mixed in at least 4% by weight with respect to the weight of the filter material so as to have a pore structure of fine pores as a filter material to improve the dust collection efficiency, Air permeability is 10cc / cm
A pressure of ² / s or more is secured to reduce the pressure loss as a dust bag. When the Frazier air permeability is less than 10 cc / cm ² / s, the pressure loss becomes high and the suction power is less than 300 W, which is not preferable.

The single-layer filter material of the present invention is a sheet comprising 5 to 20% by weight of plant fibers, 15 to 35% by weight of synthetic fibers, 35 to 60% by weight of synthetic binder fibers, and 15 to 18% by weight of micro glass fibers. First, it is made into paper. It is characterized by higher strength and higher dust collection efficiency than the two-layer filter material of the present invention, and contains a large amount of micro glass fiber. The vinylon fiber and PVA fiber improve the strength, and the polyester binder fiber (melting point) A hemp TMP having a high fineness (200 ° C.) is used to increase the air permeability by heat-treating it without applying a pressing pressure in the processing step. If the vegetable fiber content is less than 5% by weight, the amount of the polyester fiber and the polyester binder fiber compounded will be large, and the filter material will be elongated and the dust collection efficiency will be reduced, such being undesirable. 2 plant fibers
If it is 0% by weight or more, clogging occurs and pressure loss increases, which is not preferable. If the synthetic fiber content is less than 15% by weight, the polyester fiber becomes insufficient, the air permeability is lowered, the flexibility is lost, and the opening is deteriorated, which is not preferable. If the synthetic fiber is 35% by weight or more, the blending amount of the synthetic binder fiber for adhering the polyester fiber or the vinylon fiber becomes insufficient, resulting in hair loss or insufficient strength, which is not preferable. If the synthetic binder fiber is less than 35% by weight, it will be insufficient for adhering the polyester fiber or the vinylon fiber, and the fineness of 15-
20 μm (2 to 4 denier) polyester binder fibers are insufficient, and it becomes impossible to open the eyes, which is not preferable. If the synthetic binder fiber content is 60% by weight or more, the melted portion of the fiber will close the eyes, resulting in high pressure loss, which is not preferable. If the amount of the micro glass fiber is less than 15% by weight, the dust collection efficiency will not be achieved, which is not preferable. If it is 18% by weight or more, the pressure loss becomes too high, which is not preferable. Within the range of the above-mentioned fiber blending, strength, air permeability and dust collection efficiency can be balanced, so it is not preferable to deviate from the range.

The basis weight of the fiber sheet of the filter material comprising one layer of the present invention is 39.0 to 49.0 g / m ² . Three
If it is 9.0 g / m ² or less, the strength as a filter material is lowered, and the thickness is also reduced to lower the dust collecting capacity, which is not preferable. When it is 49.0 g / m ² or more, the thickness is increased and the air permeability is lowered, which is not preferable.

The one-layer filter material of the present invention is obtained by impregnating an emulsion type binder having a glass transition point of 33 ° C. or higher with 11 to 18% by weight based on the weight of the fiber sheet. To make a filter material with high dust collection, it is necessary to reduce the elongation and reduce the leakage of dust caused by the wind that stretches when used as a dust bag to open and eyes open. The emulsion type binder is not so preferable because it is too soft and the elongation becomes large. If the amount of emulsion type binder attached is less than 11% by weight,
As it cannot be given sufficient strength as a dust bag, it easily breaks during suction with an electric vacuum cleaner.Because of its weak strength, it stretches significantly, and its stretched eyes open and dust leaks, increasing dust collection efficiency. It is not preferable because it decreases. If it is more than 18% by weight, the sheet is tightened in the Z direction by the binder, the voids between the fibers are crushed and the eyes are clogged, the space for capturing dust becomes small, and the air permeability and the dust collection efficiency are adversely affected. .

The Frazier air permeability of the one-layer filter material of the present invention is 10 according to the measuring method of JIS L1096.
cc / cm ² / s or more. If it is lower than 10cc / cm ² / s,
The pressure loss as a dust bag increases and the suction work rate becomes less than 300 W, which is not preferable.

The filter material consisting of one layer of the present invention is J
According to the IS L1085 measuring method, the tensile width is 9 kg / 50 mm or more, and the breaking elongation is 7 to 9%. The reason why the problem is limited to the lateral direction is that the strength in the longitudinal direction is stronger than that in the lateral direction due to the fiber orientation of the paper machine, so that only the weaker lateral direction becomes a problem regarding bag tearing. The dust collecting bag catches the dust, and as the amount of the dust collecting increases, the dust collecting bag becomes clogged and the air permeability is lowered. The stronger the tensile strength of the filter material is, the more preferable it is in order to prevent the bag from being torn during dust collection. As a result of diligent studies on the relationship between the tensile strength of the filter material and the bag tear, it was confirmed that the bag tear did not occur even if 400 g or more of dust was sucked if the tensile width was 8 kg / 50 mm or more. In consideration of further safety, the tensile width is 9 kg / 50 mm or more.
In addition, the elongation at break was specified in order to have an appropriate hardness as a filter material. If the breaking elongation is less than 7%, it is too hard as a filter material, so that the opening of the dust collecting bag becomes poor and the dust collecting capacity decreases. If the breaking elongation is 9% or more, it is too soft as a filter material, so that it is stretched by the wind of an electric vacuum cleaner as a dust bag to open its eyes and dust easily leaks to lower the dust collection efficiency.

The dust collecting performance of the filter material of the present invention is higher than that of the conventional filter material, and it is about 1 micron when applied to a dust collecting bag of an electric vacuum cleaner having a suction power of 300 to 400 W. Even dust such as mites can be sufficiently captured. In addition, there are few initial leaks, and the advantage is that the inside of the main body of the electric vacuum cleaner does not get dirty. The most leakage of dust from the dust collecting bag occurs at the beginning of use, and after the initial stage, the filter material is clogged with dust and does not leak much, and the number of leaks does not change with any filter material. Therefore, the number of dust leaks up to the initial leak accounts for the majority of the total number of dust leaks in the life of the dust collection bag, and how to minimize the initial leak is the most important for improving the dust collection efficiency. That is. Regarding the method of measuring the dust collection efficiency of the present invention, a single sheet of filter material can be used according to JIS B9.
The measurement of the dust (particle size 0.5 to 2.0 μm) collection efficiency by 908 and the practical test performed by making a dust bag from the filter material and mounting it on the electric vacuum cleaner were performed. The former measurement method is suitable for observing the dust-capturing ability of the filter material in a new state, that is, it is an effective method for predicting the initial leakage. The latter measurement method is a method that allows comprehensive evaluation including the initial leakage up to the life of the dust bag. That is, it is possible to observe dust trapping under a condition in which considerable stress is generated as the filter material under the high power wind of the vacuum cleaner. The dust collection efficiency of the filter material of the present invention is 99.96% or more or 99.96% or more from the conventional 99.95% level by the latter measurement method.
It has improved to over 97%. Dust collection efficiency and initial leakage (leakage number up to 20 g of dust input), dust input amount of 30 g to 2
Table 1 shows the relationship between the number of leaks of 00 g and the total number of leaks up to the amount of dust input of 200 g. The dust is Portland cement and has a dust diameter of 0.5 to 1.0 μm. It can be seen from Table 1 that the dust collection efficiency of 99.985% and 99.950% has a difference of 6 times or more in the initial leakage.

[0022]

[Table 1]

The single-layer filter material of the present invention is most characterized in that it contains a large amount of microglass fibers to further enhance the dust collection efficiency. Good. That is, the basis weight ratio of the two layers is DS
30 to 50% by weight and CS 50 to 70% by weight, and the fiber composition of each layer is 5 to 20% by weight of plant fiber and 15 of synthetic fiber.
~ 35 wt%, synthetic binder fiber 35-60 wt%,
Micro glass fiber 11 to 18% by weight, basis weight 39.0
It is a filter material obtained by impregnating an emulsion type binder having a glass transition point of 33 ° C. or more with 11 to 18% by weight of a two-layer sheet of up to 49.0 g / m ² . The details will be described below.

Similar to the one-layer filter material of the present invention, when a filter material having high dust collection, low pressure loss, and high strength is manufactured with a two-layer structure, the fibers and binder to be blended are all the same, and the composition is the same. Is also the same. Make sure that DS has low density and open eyes, and that CS has high density and fine voids. 2
The feature is that the fiber composition is slightly different between DS and CS so that a density gradient is formed in the layer. That is, in DS, the ratio of polyester binder fibers having a large fineness is increased, and the ratio of microglass fibers is decreased to open the eyes, but CS has a completely opposite tendency to form a fine void structure. Therefore, the amount of CS micro glass fiber compounded is large,
It is more advantageous to increase the basis weight of CS. If the basis weight ratio of CS is less than 50%, the space for capturing fine dust is narrowed and the dust collection efficiency is reduced, which is not preferable. C
If the basis weight ratio of S is increased, it is advantageous for the dust collection efficiency, but since DS is decreased, the filter material cannot be opened, and the pressure loss increases. When the basis weight ratio of DS is less than 30%, the pressure loss becomes too high, which is not preferable.

The fiber content of each layer is 5 to 20% by weight of plant fibers, 15 to 35% by weight of synthetic fibers, and 3 of synthetic binder fibers.
5-60% by weight, micro glass fiber 11-18% by weight
With a basis weight of 39.0 to 49.0 g / m ²
The base paper of is first made into paper. If the vegetable fiber content is less than 5% by weight, the amount of the polyester fiber and the polyester binder fiber compounded will be large, and the filter material will be elongated and the dust collection efficiency will be reduced, such being undesirable. When the content of the vegetable fiber is 20% by weight or more, the eyes are clogged and the pressure loss is increased, which is not preferable. If the synthetic fiber content is less than 15% by weight, the polyester fiber becomes insufficient, the air permeability is lowered, the flexibility is lost, and the opening is deteriorated, which is not preferable. If the synthetic fiber is 35% by weight or more, the blending amount of the synthetic binder fiber for adhering the polyester fiber or the vinylon fiber becomes insufficient, resulting in hair loss or insufficient strength, which is not preferable. Synthetic binder fiber 3
If it is less than 5% by weight, it will be insufficient for adhering the polyester fiber or vinylon fiber, and the fineness is 15 to 20.
It is not preferable because the polyester binder fiber of μm (2 to 4 denier) is insufficient and the eyes cannot be opened. If the synthetic binder fiber content is 60% by weight or more, the melted portion of the fiber will close the eyes, resulting in high pressure loss, which is not preferable. If the amount of the micro glass fiber is less than 11% by weight, the dust collection efficiency will not be achieved, which is not preferable. Above 18% by weight,
The pressure loss becomes too high, which is not preferable. Base paper weight is 3
If it is less than 9.0 g / m ² , the strength is insufficient, and the thickness is reduced to lower the dust collection efficiency, which is not preferable. When the basis weight of the base paper is 49.0 g / m ² or more, the pressure loss becomes high, which is not preferable.

The type and amount of the emulsion-type binder are exactly the same as those of the filter material constituted by one layer of the present invention, and the filter material has the Frazier air permeability, the tensile weft,
The same applies to the breaking elongation horizontal.

In order to satisfy the standards for both the Frazier air permeability and the dust collection efficiency of the filter material of the present invention, it is necessary to maintain the void structure, density, and air permeability of the filter material in appropriate states, and the balance of these states. If the value of the micro glass fiber falls, either the Frazier air permeability or the dust collection efficiency, which are in a mutually contradictory relationship, falls below the lower limit of the standard.
In addition to blending factors such as the amount of emulsion type binder attached, it is necessary to control various pressures at the press part and Yankee dryer inlet as process factors.

[0028]

The filter material of the present invention contains a large amount of fibers having excellent air permeability such as polyester fibers as compared with the conventional filter material to reduce pressure loss and to provide flexibility.
A large amount of micro glass fibers with a fiber diameter of 1.0 μm or less is mixed to improve the dust collection efficiency, while the amount of vegetable fibers such as wood pulp and hemp pulp is decreased, so the emulsion type binder is impregnated to give strength. It is a thing. The higher the glass transition point of this emulsion type binder,
The expansion of the filter material can be suppressed to a small level, and the dust collecting bag can be prevented from expanding under the influence of wind to open its eyes and prevent dust from leaking, improving the dust collecting efficiency. The lower the glass transition point of the emulsion type binder, the softer the filter material becomes, the lower the pressure loss and the better the opening, but the dust collection efficiency decreases. The layer structure may be one layer or two layers, and if the micro glass fiber is mixed to the maximum extent, the dust collection efficiency is further improved. Thus, the pressure loss is low, and the suction power is 300 W even when used in a dust bag of a high-power vacuum cleaner.
By providing the above, it is possible to provide a filter material that has little initial leakage, is less likely to tear the bag, and has a good opening.

[0029]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.
Tables 2 and 3 show the formulations and layer configurations of typical examples and comparative examples. Tables 4 to 6 show DS, CS plant fibers, synthetic fibers, synthetic binder fibers, micro glass fiber compounding ratios, DS and CS basis weight ratios, and micro glass fibers for all Examples and Comparative Examples. The blending ratio with respect to the filter material, the basis weight of the base paper, the glass transition point of the emulsion-type binder (hereinafter abbreviated as T _G ), and the adhesion amount (ratio to the base paper) are shown.

In the examples, all% are weight%.
It is due to. The measurement items of the filter material are basis weight,
Vacuum cleaner made by Matsushita Electric Co., Ltd. canister MC-S69P (suction work) The evaluation items performed by mounting and operating at a rate of 330 to 340 W are suction work rate, dust collection efficiency, initial leakage, opening, and bag tearing, and the results are shown in Tables 7 to 15.
Shown in. Tables 7-9 show two-layer filter materials, Tables 10-10
The results for the filter material having a one-layer structure are shown in Table 12, and the results for the filter material having a two-layer structure (DS and CS containing microglass fiber) are shown in Tables 13 to 15, respectively.

The basis weight / thickness / vertical length is JIS L-10.
85, Frazier air permeability, burst is JIS L-109
6 is JIS L-1068 for the horizontal and tensile elongation.
Was measured according to. Regarding the strength, since the fiber orientations are more aligned in the machine direction, tensile is sufficiently strong in the vertical direction, and tearing is sufficiently strong in the lateral direction, so there is no problem with both. Therefore, only the tensile width, the elongation at break and the tear length are included in the items.

A method for measuring the dust collection efficiency with a single filter material plate will be described. It is measured according to JIS B9908. Set the filter material (test piece) and let the air flow velocity 5.3 cm /
The number of dust particles in the air sampled before and after the test piece is passed through the test piece in seconds, and the number of particles in the air is measured by a light scattering type particle counter (K
C-11, manufactured by Rion Co., Ltd.), and the dust collection efficiency is calculated by the formula shown in Formula 1. The number of particles was measured as follows:
The dust collection efficiency was calculated by performing a range of 5 to 1.0 μm and a range of particle size of 1.0 to 2.0 μm, respectively.

[0033]

[Equation 1] A = (B−C) / B × 100 A: Dust collection efficiency (%) B: Number of particles before passage C: Number of particles after passage

A method of measuring the pressure loss of the filter material single plate will be described. In the measuring machine of Fig. 1, filter material (test piece)
Place 3 on the specimen mount 2 and clamp. The fan 1 for sucking in air is operated to suck in air and adjust it with the adjusting resistor 8 to adjust the head difference shown by the manometer 6 for measuring the air flow rate to 10
It was adjusted to 0 mmH ₂ O, and the reading of the head difference of the manometer 7 for measuring the pressure loss at that time was taken as the initial pressure loss. Next, JIS Z
The pressure loss after 5 g of the test dust type 4 defined in 8901 was charged from the dust charging port 5 at a rate of 0.5 g / sec was measured in the same manner, and this was taken as the pressure loss after charging 5 g.

The suction power was measured in accordance with JIS C9108 when the vacuum cleaner was idle at a rated voltage and the main body had no dust bag and the dust bag was attached. When the dust collecting bag is attached, the suction work rate decreases due to the pressure loss of the dust collecting bag itself. Therefore, those having a suction work rate of less than 300 W are marked with X, and those holding 300 W or more are marked with a circle.

The dust collection efficiency is (0.3) in a clean environment of air.
It is carried out in a dust-free room with a collection efficiency of μm particles of 99.97% or more. First, the vacuum cleaner is operated at the rated voltage with the dust bag removed from the main body of the vacuum cleaner. Next, 0.1 g of dried Portland cement as test dust was sucked through the tip pipe for 1 minute, and air containing dust was discharged from the exhaust port of the electric vacuum cleaner using a light scattering particle counter (KC-11, Lion Corporation). The number of dust particles having a diameter of 1.0 μm is measured, and this is defined as the dust leakage amount X ₀ . Next, attach a dust bag to the body of the electric vacuum cleaner, operate the electric vacuum cleaner at the rated voltage, allow 10 g of dried Portland cement to be sucked in from the tip pipe for 40 seconds, and let it stand for 1 minute. The number of particles of dust of 0.0 μm is measured, and this is defined as the dust leakage amount X ₁ . 20 as one cycle
Times repeated, that is, to smoke in a total of up to 200g same dust bag, measuring the X ₁ ~X _20. In addition, the inside of the vacuum cleaner is cleaned with high-pressure air after each cycle measurement. Here, the dust collection efficiency was calculated by Equation 1.

[0037]

[Equation 2] η = (A−B) / A × 100 (%) η: Dust collection efficiency A: X ₀ × 100 × 20 (total dust absorption) B: X ₁ + ... + X ₂₀ (Dust leakage total)

Regarding the initial leakage, the dirt of the main body after observing the dust collection efficiency to the electric vacuum cleaner up to 20 g of dust was observed, ⊚: not dirty, ◯: dirt was not noticeable,
Δ: Slightly conspicuous, x: Stain is conspicuously evaluated and recorded in four levels.

To open the dust collecting bag, attach the dust collecting bag to the main body of the electric vacuum cleaner, use Portland cement, and operate the electric vacuum cleaner for 2 minutes at the rated voltage to suck only air and stop the collection. Observing the opened state of the dust bag, it was marked with ◯ when it swelled to fill the space inside the main body, and with x when it did not bulge even a part.

As for the bag breakage, a dust bag is attached to the main body of the vacuum cleaner, and the vacuum cleaner is preliminarily operated for 30 minutes at the rated voltage. After allowing 200 g of Portland cement to be absorbed in 1 minute, it is left for 2 minutes. After that, Portland Cement 2
Sucking 0 g for 40 seconds and then leaving it for 2 minutes are repeated until the dust bag is broken. The input amount of Portland cement when the dust bag was broken was measured. ◎ if the input amount is 400 g or more, ○, 300 g if 300 g to 400 g
If less than, x is shown in Tables 5 and 8.

Comparative Example 1 As shown in Table 2, NBKP Arauco 36% as DS,
Polyester fiber (made by Kuraray, fineness 1.5 denier (=
11.5 μm), fiber length 5 mm) 20%, core-sheath type polyester binder fiber (Unitika Melty 408)
0, fineness 4 denier (= 20 μm), fiber length 5 mm, sheath melting point 110 ° C. 40%, PVA fiber (Kuraray VPB)
107-1 x 3, fineness 1 denier (= 10 μm), fiber length 3
mm, total melting at 70 ° C) 4% blended, CS as hemp TM
P (Toho straw pulp, hemp 1B1S) 12%, NBKP
Arauco 50%, polyester fiber (made by Teijin, fineness 0.
5 denier (= 7 μm), fiber length 5 mm 6%, polyester fiber (Kuraray, fineness 1.5 denier (= 11.
5 μm), fiber length 5 mm) 6%, core-sheath polyester binder fiber (Unitika Melty 4080, fineness 2
Denier (= 14μm), fiber length 5mm, sheath melting point 11
18%, PVA fiber (Kuraray VPB107-1 x 3)
, Fineness 1 denier (= 10 μm), fiber length 3 mm, 7
4% of total melting at 0 ° C., micro glass fiber (106-253 manufactured by Schuller, fineness 0.6 μm, hereinafter abbreviated as MG)
4% was blended, two layers were made by a cylinder paper machine at a basis weight ratio of 1: 1 and dried at 120 ° C. with a Yankee dryer, and wound as a filter material having a basis weight of 50 g / m ² . M. G
The compounding amount was 2% with respect to the filter material. A dust bag was made from this filter material and attached to an electric vacuum cleaner (Canister MC-S69P manufactured by Matsushita Electric Industrial Co., Ltd.) to evaluate the dust bag. The physical properties of the filter material and the evaluation results of the dust bag are shown in Tables 7-9.

Comparative Example 2 CS of M.S. G4% → 2%, polyester fiber (made by Teijin, fineness 0.5 denier (= 7 μm), fiber length 5 mm)
A filter material was produced in exactly the same manner as in Comparative Example 1 except that the ratio was changed from 6% to 8%. M. The content of G was 1% with respect to the filter material. The results are shown in Tables 7-9.

Example 1 As shown in Table 2, as DS, hemp TMP (Toho straw pulp, hemp 1B1S) 11%, NBKP Arauco 42%, polyester fiber (manufactured by Teijin, fineness 0.5 denier (= 7 μ)
m), fiber length 5 mm) 18%, polyester fiber (Kuraray, fineness 1.5 denier (= 11.5 μm), fiber length 5 mm) 18%, core-sheath type polyester binder fiber (Unitika Melty 4080, fineness 2 denier) (=
14 μm), fiber length 5 mm, sheath melting point 110 ° C.) 11%
As a CS, hemp TMP (Toho straw pulp, hemp 1B1S) 9%, NBKP Arauco 29%, polyester fiber (Teijin, fineness 0.5 denier (= 7 μm), fiber length 5 mm) 42%, core-sheath type Polyester binder fiber (Unitika Melty 4080, fineness 2 denier (= 14 μm), fiber length 5 mm, sheath melting point 110
C.) 11%, M.I. Blended with G9%, 2 with a cylinder paper machine
Paper is made with a basis weight ratio of 1: 1 and a Yankee dryer is used for 12
It was dried at 0 ° C. and wound up as a base paper having a basis weight of 44 g / m ² . This base paper is sent to a processing machine and ethylene vinyl acetate emulsion type binder (Sumitomo Chemical's Sumika Flex 7
02 (abbreviated as S-702), T _G 0 ° C.) to make the adhered amount as solid content to the base paper basis weight 13.6% in solid content, dry at 130 to 160 ° C. with a hot air dryer, and self weight with a machine calendar. It was pressurized and wound up as a filter material. M. The content of G was 4% with respect to the filter material. The results are shown in Table 7.
~ 9.

Example 2 Ethylene vinyl acetate emulsion binder (S-
A filter material was produced in exactly the same manner as in Example 1 except that the adhesion amount of 702) was 11.1% based on the solid content of the base paper. The results are shown in Tables 7-9.

Example 3 Ethylene vinyl acetate emulsion type binder (S-
A filter material was produced in exactly the same manner as in Example 1 except that the amount of adhered 702) was 17.7% of the basis weight of the base paper based on the solid content. The results are shown in Tables 7-9.

Comparative Example 3 Ethylene vinyl acetate emulsion type binder (S-
A filter material was produced in exactly the same manner as in Example 1 except that the amount of 702) adhered was 10.0% based on the solid content of the base paper. The results are shown in Tables 7-9.

Comparative Example 4 Ethylene vinyl acetate emulsion type binder (S-
A filter material was produced in exactly the same manner as in Example 1 except that the amount of 702) adhered was 19.1% based on the solid content of the base paper. The results are shown in Tables 7-9.

Comparative Example 5 An ethylene vinyl acetate emulsion binder (Sumikaflex 751 manufactured by Sumitomo Chemical Co., Ltd., T _G -15 ° C.) was impregnated and processed to obtain a solid content of 17.7% of the basis weight of the base paper. A filter material was produced exactly as in Example 1. The results are shown in Tables 7-9.

Example 4 An example except that an ethylene vinyl acetate emulsion binder (Sumikaflex 701 manufactured by Sumitomo Chemical Co., Ltd., T _G 20 ° C.) was impregnated to obtain a solid content of 13.6% of the basis weight of the base paper. A filter material was manufactured in exactly the same manner as in 1. The results are shown in Tables 7-9.

Example 5 Example 5 except that an ethylene vinyl chloride emulsion type binder (Sumitomo Chemical's Sumielite 1310, T _G 30 ° C.) was impregnated to give a solid content of 13.6% of the basis weight of the base paper. A filter material was manufactured in exactly the same manner as in 1. The results are shown in Tables 7-9.

Example 6 Acrylic emulsion type binder (CX manufactured by Sumitomo Chemical
G-103B, T _G 33 ° C.) was impregnated and a filter material was produced in exactly the same manner as in Example 1 except that the adhered amount was 13.6% based on the solid content of the base paper. The results are shown in Tables 7-9.

Example 7 CS M.P. G9% → 16%, polyester fiber (made by Teijin, fineness 0.5 denier (= 7 μm), fiber length 5 m
m) A filter material was produced in exactly the same manner as in Example 1 except that 42% → 35%. M. The content of G in the filter material was 7%. The results are shown in Tables 7-9.

Comparative Example 6 CS of M. G9% → 7%, polyester fiber (made by Teijin, fineness 0.5 denier (= 7 μm), fiber length 5 mm)
A filter material was produced in exactly the same manner as in Example 1 except that the content was 42% → 44%. M. The content of G in the filter material was 3%. The results are shown in Tables 7-9.

Comparative Example 7 CS of M.S. G9% → 18%, polyester fiber (made by Teijin, fineness 0.5 denier (= 7 μm), fiber length 5 m
m) A filter material was produced in exactly the same manner as in Example 1 except that 42% → 33%. M. The content of G in the filter material was 8%. The results are shown in Tables 7-9.

Example 8 A filter material was manufactured in the same manner as in Example 1 except that the basis weight of the base paper was 49 g / m ² and the amount of the binder attached was 11.1% based on the solid content of the base paper. The results are shown in Tables 7-9.

Example 9 A filter material was manufactured in the same manner as in Example 1 except that the basis weight of the base paper was 35 g / m ² and the amount of the binder adhered was 17.7% based on the solid content of the base paper. The results are shown in Tables 7-9.

Comparative Example 8 A filter material was manufactured in the same manner as in Example 1 except that the basis weight of the base paper was 50 g / m ² and the amount of the binder attached was 11.1% based on the solid content of the base paper. The results are shown in Tables 7-9.

Comparative Example 9 A filter material was manufactured in the same manner as in Example 1 except that the basis weight of the base paper was 34 g / m ² and the amount of the binder attached was 17.7% based on the solid content of the base paper. The results are shown in Tables 7-9.

Example 10 As shown in Table 2, hemp TMP (made by Toho straw pulp, hemp 1B
1S) 16%, polyester fiber (made by Teijin, fineness 0.5
Denier (= 7μm), fiber length 5mm 16%, vinylon fiber (Kuraray RKW, fineness 2 denier (= 15μ)
m), fiber length 6 mm) 10%, core-sheath type polyester binder fiber (Unitika Melty 4080, fineness 2 denier (= 14 μm), fiber length 5 mm, sheath melting point 110
15%, core-sheath type polyester binder fiber (Unitika Melty 2080, fineness 4 denier (= 20μ)
m), fiber length 5 mm, sheath melting point 200 ° C.) 24%, PV
A fiber (VPB107-1 × 3 manufactured by Kuraray, fineness 1 denier (= 10 μm), fiber length 3 mm, sheath melting point 70 ° C.) 3
%, M.I. G16% was blended, a single layer was made with a cylinder paper machine, dried at 120 ° C with a Yankee dryer, and the basis weight was 4
It was wound up as a base paper of 4 g / m ² . This base paper is sent to a processing machine and impregnated with an acrylic emulsion binder (CXG-104 manufactured by Sumitomo Chemical Co., Ltd., T _G 40 ° C.) to make the adhered amount as solid content relative to the base paper basis weight of 13.6%, and 13 with a hot air dryer.
It was dried at 0 to 160 ° C., self-weighted with a machine calender, and wound as a filter material. The results are shown in Tables 10-1.
2 shows.

Example 11 A filter material was manufactured in exactly the same manner as in Example 10 except that the amount of the binder adhered to the basis weight of the base paper was 11.1% based on the solid content. The results are shown in Tables 10-12.

Example 12 A filter material was produced in the same manner as in Example 10 except that the amount of the binder adhered was 17.7% based on the solid content of the base paper. The results are shown in Tables 10-12.

Comparative Example 10 A filter material was produced in exactly the same manner as in Example 10 except that the amount of the binder adhered was 10.0% based on the solid content of the base paper. The results are shown in Tables 10-12.

Comparative Example 11 A filter material was manufactured in the same manner as in Example 10 except that the binder content was 19.1% based on the solid content of the base paper. The results are shown in Tables 10-12.

Example 13 Polyester fiber (manufactured by Teijin, fineness 0.5 denier (= 7)
μm), fiber length 5 mm) 16% → 17%, M. G16%
→ A filter material was manufactured in exactly the same manner as in Example 10 except that the content was changed to 15%. The results are shown in Tables 10-12.

Example 14 Polyester fiber (manufactured by Teijin, fineness 0.5 denier (= 7)
μm), fiber length 5 mm) 16% → 14%, M.P. G16%
A filter material was manufactured in the same manner as in Example 10 except that the content was changed to 18%. The results are shown in Tables 10-12.

Comparative Example 12 Polyester fiber (manufactured by Teijin, fineness 0.5 denier (= 7
μm), fiber length 5 mm) 16% → 18%, M.P. G16%
→ A filter material was manufactured in exactly the same manner as in Example 10 except that the content was changed to 14%. The results are shown in Tables 10-12.

Comparative Example 13 Polyester fiber (manufactured by Teijin, fineness 0.5 denier (= 7)
μm), fiber length 5 mm) 16% → 13%, M.P. G16%
→ A filter material was manufactured in exactly the same manner as in Example 10 except that the content was changed to 19%. The results are shown in Tables 10-12.

Example 15 A filter material was produced in the same manner as in Example 10 except that the basis weight of the base paper was 39 g / m ² and the amount of the binder adhered was 17.7% based on the solid content of the base paper. The results are shown in Tables 10 to 10.
12 shows.

Example 16 A filter material was produced in exactly the same manner as in Example 10 except that the basis weight of the base paper was 49 g / m ² and the amount of the binder adhered was 11.1% based on the solid content of the base paper. The results are shown in Tables 10 to 10.
12 shows.

Comparative Example 14 A filter material was produced in the same manner as in Example 10 except that the basis weight of the base paper was 38 g / m ² and the amount of the binder attached was 17.7% based on the solid content of the base paper. The results are shown in Tables 10 to 10.
12 shows.

Comparative Example 15 A filter material was produced in the same manner as in Example 10 except that the basis weight of the base paper was 50 g / m ² and the amount of the binder adhered was 11.1% based on the solid content of the base paper. The results are shown in Tables 10 to 10.
12 shows.

Example 17 Hemp TMP 16% → 5%, core-sheath type polyester binder fiber (Unitika Melty 4080, fineness 2 denier (= 14 μm), fiber length 5 mm, sheath melting point 110 ° C.) 1
A filter material was manufactured in exactly the same manner as in Example 10 except that the amount of the binder adhered was 5% → 26% and the solid content was 17.7% of the basis weight of the base paper. The results are shown in Tables 10-12.

Example 18 Hemp TMP 16% → 20%, core-sheath type polyester binder fiber (Unitika Melty 4080, fineness 2 denier (= 14 μm), fiber length 5 mm, sheath melting point 110 ° C.)
A filter material was produced in exactly the same manner as in Example 10 except that the amount of the binder adhered was changed from 15% to 11% and the basis weight of the solid content was 11.1% with respect to the base paper. The results are shown in Tables 10-12.

Comparative Example 16 Hemp TMP 16% → 4%, core-sheath type polyester binder fiber (Unitika Melty 4080, fineness 2 denier (= 14 μm), fiber length 5 mm, sheath melting point 110 ° C.) 1
A filter material was produced in exactly the same manner as in Example 10 except that the amount of the binder adhered was changed from 5% to 27% and the solid content was set to 17.7% of the basis weight of the base paper. The results are shown in Tables 10-12.

Comparative Example 17 Hemp TMP 16% → 21%, core-sheath type polyester binder fiber (Unitika Melty 4080, fineness 2 denier (= 14 μm), fiber length 5 mm, sheath melting point 110 ° C.)
A filter material was manufactured in exactly the same manner as in Example 10 except that the amount of the binder adhered was changed from 15% to 10% and the basis weight of the base paper was 11.1% based on the solid content. The results are shown in Tables 10-12.

Example 19 Acrylic emulsion type binder (CX manufactured by Sumitomo Chemical Co., Ltd.
A filter material was produced in exactly the same manner as in Example 10 except that the impregnation with G-103B and T _G 33 ° C.) was performed. The results are shown in Tables 10-12.

Comparative Example 18 Acrylic emulsion type binder (CX manufactured by Sumitomo Chemical
A filter material was manufactured in exactly the same manner as in Example 10 except that impregnation with G-103A and T _G 26 ° C.) was performed. The results are shown in Tables 10-12.

Comparative Example 19 A filter material was produced in exactly the same manner as in Example 10 except that the ethylene-vinyl chloride emulsion type binder (Sumitomo Chemical's Sumielite 1310, T _G 30 ° C.) was impregnated. The results are shown in Tables 10-12.

[0079] The base paper composed 44 g / m ² in basis weight ratio of 50:50 of DS and CS in the fiber composition shown in Example 20 Table 2, processing to produce a filter material in the same manner as in Example 10 . The results are shown in Table 13.
~ 15.

Example 21 A filter material was produced in exactly the same manner as in Example 10 except that a base paper having a fiber composition shown in Table 2 and a basis weight ratio of DS and CS of 41:59 of 44 g / m ² was processed. . The results are shown in Table 13.
~ 15.

Example 22 A filter material was produced in exactly the same manner as in Example 10 except that a base paper having a fiber composition shown in Table 2 and a basis weight ratio of DS and CS of 32:68 of 44 g / m ² was processed. . The results are shown in Table 13.
~ 15.

Comparative Example 20 The fiber composition was exactly the same as in Example 20, and a base paper of 44 g / m ² having a basis weight ratio of DS and CS of 55:45 was used. The wood was manufactured. The results are shown in Tables 13-15.

Comparative Example 21 The fiber composition was exactly the same as in Example 22, except that a base paper of 44 g / m ² having a basis weight ratio of DS to CS of 27:73 was used, and the processing was carried out in the same manner as in Example 10 to obtain a filter. The wood was manufactured. The results are shown in Tables 13-15.

[0084]

[Table 2]

[0085]

[Table 3]

[0086]

[Table 4]

[0087]

[Table 5]

[0088]

[Table 6]

[0089]

[Table 7]

[0090]

[Table 8]

[0091]

[Table 9]

[0092]

[Table 10]

[0093]

[Table 11]

[0094]

[Table 12]

[0095]

[Table 13]

[0096]

[Table 14]

[0097]

[Table 15]

The results of all Examples and Comparative Examples will be described below. Comparative Examples 1-2 are conventional filter materials, Examples 1-9 are two-layer filter materials of the present invention, Example 1
Nos. 0 to 22 are filter materials with higher dust collection of the present invention, of which Examples 10 to 19 have one layer and Examples 20 to 22 have two layers.

Comparative Examples 3 to 9 for Examples 1 to 9, Comparative Examples 10 to 19 and Examples 20 to 22 for Examples 10 to 19
On the other hand, Comparative Examples 20-21 were put.

FIG. 2 shows the relationship between the Frazier air permeability of the filter material and the initial pressure loss and the pressure loss when 5 g of dust was charged, and FIG. 3 shows the relationship between the Frazier air permeability of the filter material and the suction power. It can be seen that the higher the Frazier air permeability of the filter material, the lower the initial pressure loss and the pressure loss when 5 g of dust are charged, and the suction work rate increases. Frazier air permeability is 1
It can be seen that if it is 0 cc / cm ² or more, the suction power becomes 300 W or more.

FIG. 4 shows the relationship between the dust collection efficiency of a single filter material plate and the dust collection efficiency of an electric vacuum cleaner as a dust collection bag.
If there is a positive correlation and the dust collection efficiency of the single plate is good, it can be seen that the dust collection bag has good dust collection efficiency.

Since Comparative Example 1 is a conventional filter material and the dust collection efficiency is not high, there are many initial leaks, the eyes are clogged and the paper quality is hard, so the suction power is less than 300 W, the opening is poor, and the bag tears quickly. In Comparative Example 2, since the micro glass fiber was reduced and the eyes were opened, the suction work rate was 300 W or more, but initial leakage, opening, and bag tearing were all unfavorable results, and as a dust bag for a high-powered vacuum cleaner. It wasn't right.

In Examples 1 to 3 and Comparative Examples 3 to 4, the influence of the amount of the adhered binder was observed. When the amount of the adhered binder was reduced, the elongation of the filter material was increased and the dust collection efficiency was lowered and the strength was increased. It is not preferable because it will fall and the bag will tear quickly. If the adhered amount is large, the filter material is clogged, and the suction work rate is reduced and the dust collection efficiency is reduced.

In Comparative Example 5 and Examples 4 to 6, the binder T was used.
The effect of _G was observed, and when a binder having a low T _G was used, the elongation of the filter material increased and the dust collection efficiency decreased. The higher the T _{G of the} binder, the smaller the elongation of the filter material and the higher the dust collection efficiency. No particular problem the higher the T _G but, T _G than 0 ℃
If a binder having a low value is used, the dust collection efficiency is unachieved, which is not preferable.

In Example 7 and Comparative Examples 6 to 7, the influence of the compounding amount of the micro glass fiber was observed. If the CS is up to 16%, the suction power of 300 W or more can be maintained, but if it is more than this, the eyes are too clogged. The suction work rate is not reached. 8 for CS
If it is less than%, the dust collection efficiency decreases and the initial leakage becomes conspicuous.

In Examples 8 to 9 and Comparative Examples 8 to 9, the influence of the grammage of the base paper was observed. When the grammage is increased, the pressure loss increases, so that it is necessary to reduce the amount of the binder adhered. Becomes easy to grow and the dust collection efficiency decreases. Since lowering the basis weight lowers the strength, it is necessary to increase the adhered amount of the binder, which causes clogging of the filter material and lowers the dust collection efficiency. When the basis weight of the base paper is out of the range of 35 to 49 g / m ² , the dust collection efficiency is unachievable, which is not preferable.

In Examples 10 to 12 and Comparative Examples 10 to 11, the influence of the amount of the adhered binder was observed. When the amount of the adhered binder decreased, the elongation of the filter material increased, resulting in a decrease in dust collection efficiency and strength. It is not preferable because it will fall and the bag will tear quickly. If the adhered amount is large, the filter material is clogged, and the suction work rate is reduced and the dust collection efficiency is reduced.

In Examples 13 to 14 and Comparative Examples 12 to 13, the influence of the compounding amount of the micro glass fiber was observed, and it was 18%.
Up to this point, the suction power of 300 W or more can be maintained, but if it is higher than this, the eyes are clogged too much and the suction power of power cannot be reached. 1
If it is less than 5%, the dust collection efficiency decreases and the initial leakage becomes slightly visible.

In Examples 15 to 16 and Comparative Examples 14 to 15, the effect of the grammage of the base paper was observed. When the grammage is increased, the pressure loss increases, so it is necessary to reduce the amount of binder adhered. Becomes easy to grow and the dust collection efficiency decreases. Since lowering the basis weight lowers the strength, it is necessary to increase the adhered amount of the binder, which causes clogging of the filter material and lowers the dust collection efficiency. Base paper weight is 39-49
If it is out of the range of g / m ^2, the dust collection efficiency may not be achieved, which is not preferable.

In Examples 17 to 18 and Comparative Examples 16 to 17, the effect of the blending amount of the plant fiber was observed. To reduce the blending amount and increase the strength, polyester binder fibers were added and the amount of the binder attached was increased. Since the filter material is easily expanded, the filter material is easily stretched and the eyes are also clogged, so that both the dust collection efficiency and the suction work rate decrease. If the compounding amount is increased, the eyes will be clogged, so that it is necessary to reduce the amount of the binder adhered, so that the filter material is easily stretched and the dust collection efficiency is reduced. Compounding amount is 5
If it is less than%, the dust collection efficiency will not be achieved, and if it is more than 20%, the suction power will not be achieved.

In Example 19 and Comparative Examples 18 to 19, the effect of T _G of the binder was observed, and when a binder having a low T _G was used, the elongation of the filter material increased and the dust collection efficiency decreased. Although the dust collection efficiency can be achieved with a binder having a T _{G of} 33 ° C., the dust collection efficiency cannot be achieved with a binder having a lower T _G than that.

In Examples 20 to 22 and Comparative Examples 20 to 21, 2
The effect of the grammage ratio of DS and CS when manufacturing a filter material with a layered structure and high dust collection was observed. The larger the DS ratio, the lower the pressure loss but the worse the dust collection efficiency. The larger the ratio of CS, the better the dust collection efficiency and the higher the pressure loss. A minimum CS ratio of 50% is required to achieve dust collection efficiency, and a minimum DS ratio of 30% is required to achieve suction power.
Indicates that it is necessary.

When the elongation of the filter material is large, the dust collecting bag receives the wind of the electric vacuum cleaner and its eyes open, so that the dust leaks and the dust collecting efficiency decreases.
Described in. Comparative Example 18 has a binder T _G of 26 ° C.,
It is all the same in Example 10 except that it is 40 ° C. Since T _G is low, Comparative Example 18 is soft as a filter material and therefore has a large elongation. The effect of elongation began to appear after the amount of dust input exceeded 100 g, and the leakage of dust gradually increased due to the opening of the eyes. Therefore, although the initial leakage was small and good, the dust collection efficiency did not reach it. Table 16 shows the progress of leakage and dust collection efficiency of Example 10 and Comparative Example 18 up to a dust input amount of 200 g.

[0114]

[Table 16]

[0115]

EFFECTS OF THE INVENTION According to the present invention, it is possible to provide a filter material having good air permeability, fine void structure, high dust collection efficiency, strength and flexibility as compared with the conventional filter material. done. Therefore, a dust bag is made from the filter material of the present invention, and the suction power is 300 to 400 W.
When used with the high power shoe vacuum cleaner of No. 3, good results were obtained for all five items: suction work rate, dust collection efficiency, initial leakage, opening, and bag tearing. It was impossible to apply the conventional filter material to the dust bag of the high-power electric vacuum cleaner, but the filter material of the present invention made it possible.

[Brief description of drawings]

FIG. 1 is a schematic view of a pressure loss measuring device.

FIG. 2 shows the Frazier air permeability of the filter material of the present invention,
Relationship between initial pressure loss and pressure loss when 5 g is charged.

FIG. 3 shows the Frazier air permeability of the filter material of the present invention,
Relationship between suction work rate in a practical test of a vacuum cleaner dust bag.

FIG. 4 shows the relationship between the dust collection efficiency of a single plate of the filter material of the present invention and the dust collection efficiency in a practical test of a dust collection bag of an electric vacuum cleaner.

[Explanation of symbols]

 1 Air intake fan 2 Specimen mount 3 Specimen 4 Hepa filter 5 Dust inlet 6 Air flow rate measurement manometer 7 Pressure loss manometer 8 Adjusting resistor

Claims (9)

[Claims] 1. 50 to 60% by weight of vegetable fiber, 3 synthetic fibers
0-40% by weight, synthetic binder fiber 10-15% by weight
A dust layer consisting of 30 to 40% by weight of plant fibers, 30 to 50% by weight of synthetic fibers, 10 to 15% by weight of synthetic binder fibers, and a clean layer of 8 to 16% by weight of micro glass fibers. Amount 35.0-49.0g /
A filter material for a vacuum cleaner dust bag, which is obtained by impregnating a sheet of m ² with an emulsion type binder having a glass transition point of 0 ° C. or higher by 11 to 18% by weight. 2. The filter material for a vacuum cleaner dust bag according to claim 1, wherein the micro glass fiber is contained in an amount of 4 to 7% by weight based on the total weight of the filter material. 3. Frazier air permeability according to JIS L1096
The filter material for a vacuum cleaner dust bag according to claim 1 or 2, wherein the filter material has a density of 10 cc / cm ² / s or more according to the measuring method of. 4. Plant fiber 5 to 20% by weight, synthetic fiber 15
~ 35 wt%, synthetic binder fiber 35-60 wt%,
For a sheet having a basis weight of 39.0 to 49.0 g / m ² composed of one layer made of 15 to 18% of micro glass fiber,
A filter material for a vacuum cleaner dust bag, which is obtained by impregnating 11 to 18% by weight of an emulsion type binder having a glass transition point of 33 ° C or higher. 5. The filter material for a vacuum cleaner dust bag according to claim 4, which has a Frazier air permeability of 10 cc / cm ² / s or more according to the measurement method of JIS L1096. 6. The filter material for a vacuum cleaner dust bag according to claim 4, which has a tensile width of 9 kg / 50 mm or more and an elongation at break of 7 to 9% according to the measuring method of JIS L1085. 7. A dust layer of 30 to 50% by weight and a clean layer of 50 to 70% by weight, and the fiber composition of each layer is 5 to 20% by weight of plant fiber, 15 to 35% by weight of synthetic fiber, and synthetic. Binder fiber 35 to 60% by weight, micro glass fiber 11 to 18%, basis weight 39.0 to 49.0 g /
A filter material for a vacuum cleaner dust-collecting bag, characterized by comprising 11 to 18% by weight of an emulsion type binder having a glass transition point of 33 ° C. or more impregnated into a two-layer sheet of m ² . 8. The filter material for a vacuum cleaner dust bag according to claim 7, which has a Frazier air permeability of 10 cc / cm ² / s or more according to the measurement method of JIS L1096. 9. The filter material for a vacuum cleaner dust bag according to claim 7, which has a tensile width of 9 kg / 50 mm or more and an elongation at break of 7 to 9% according to the measurement method of JIS L1085.