JPH057538A - Filter paper for dust collecting bag of vacuum cleaner - Google Patents

Abstract

PURPOSE:To provide a filter paper for dust collecting bag of a vacuum cleaner, which is economical, disposable and excellent in the rate of dust collection, permeability and strength. CONSTITUTION:A filter paper is made of 5-20wt.% of 1 denier or less synthetic or regenerated fibers, 20-50wt.% of 2 denier or less heat adhesive conjugate fibers, 10-65wt.% of wood pulp and 10-30wt.% of mercerized wood pulp and has characteristically 30-100g/m<2> of basis weight and 0.2-0.4cm<3>/cm<3> of fiber packing density (volume of fibers occupying unit volume).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter paper for a dust bag used by being attached to an electric vacuum cleaner.

[0002]

2. Description of the Related Art In recent years, electric vacuum cleaners using disposable dust collection bags have become widely used due to their ease of dust disposal and their ability to capture fine dust. Conventionally, filter paper for dust collecting bags used in this type of vacuum cleaner includes wood pulp, hemp pulp, glass fiber, synthetic or regenerated fiber of normal denier (1 denier (d) or more) and a small amount of PVA binder fiber. Is used.

The filter paper for such a dust bag expands the structure that is easily clogged with flat wood pulp or hemp pulp by blending synthetic or regenerated fibers of 1 d or more to collect efficiency (dust collection rate) and pressure loss. (Air permeability) and balance,
Furthermore, the hemp pulp and the PVA-based binder fiber are blended to impart strength to the paper.

[0004]

However, such filter bags for dust collecting bags have a large fineness of wood pulp, hemp pulp, synthetic or regenerated fibers to be used, and the flatness of the wood pulp and the hemp pulp is small despite the small number of constituents. Although the collection efficiency is good due to the effect, there is a drawback that the pressure loss is large.

Further, it is important that the disposable dust collecting bag is inexpensive, but there is a problem in that it is expensive because a large amount of synthetic or recycled fiber is used to expand the clogging structure of wood pulp and hemp pulp. This type of vacuum cleaner contributes to the slow spread of the vacuum cleaner while providing a comfortable environment and convenience.

Therefore, an object of the present invention is to provide a filter paper for an electric vacuum cleaner dust bag, which is excellent in all of dust collection rate, air permeability and strength, and is low in cost.

[0007]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventor has blended a mercerized wood pulp and an ultrafine denier synthetic or recycled fiber in a specific ratio and By setting the packing density (volume of fiber content per unit volume) within a specific range, it is possible to balance the dust collection rate and air permeability. Furthermore, the use of heat-fusible composite fibers reduces air permeability. The present invention has been completed to find that strength can be imparted without inviting.

That is, the filter paper for the vacuum cleaner dust-collecting bag of the present invention comprises 5 to 20% by weight of synthetic or regenerated fiber having a denier of less than 1 to 20% to 50% by weight of heat-fusible composite fiber of 2 denier or less, and 10% of wood pulp. ~ 65 wt%, mercerized wood pulp 10-30 wt%, basis weight 30-100 g /
m ^2, and characterized in that it has a (fiber content of volume occupied per unit volume) 0.2~0.4cm ³ / cm ³ fiber packing density.

According to the filter paper for the dust collecting bag of the present invention as described above, the following operational effects (1) to (4) can be obtained. (1) Wood pulp (eg NBKP and mercerized NBK
Since it is mainly based on P), it is inexpensive. (2) Since the fineness is small, the number of fibers per unit weight is large, and by using fine denier synthetic or regenerated fibers with a small diameter and by using mercerized wood pulp, the clogging structure of the wood pulp is appropriately expanded. In addition, the small mesh having a large number of three-dimensional structures formed between the fibers or pulp and the mercerized wood valp enhances the capturing power of fine dust and the initial pressure loss is small. (3) Since the heat-fusible composite fiber effectively adheres to the intersection of the synthetic or regenerated fiber and the pulp, it has high strength and high air permeability. (4) By setting the fiber packing density within a specific range, the ability to capture fine dust is high.

In the present invention, wood pulp, mercerized wood pulp, synthetic or regenerated fibers of fine denier, and heat-fusible composite fibers are blended in a specific ratio, and the basis weight and the fiber packing density are adjusted to specific ranges. It is essential to achieve the intended purpose, but the thickness and blending amount of fine or fine denier synthetic or regenerated fiber and the blending amount of mercerized wood pulp are the most important points.

The fineness of fine denier synthetic or regenerated fibers is less than 1d, preferably about 0.5d. 1
If it is more than d, the ability to capture fine dust is significantly reduced. In addition, the amount of synthetic or recycled fiber of this fine denier is 5
20% (% by weight, the same applies hereinafter). If it is less than 5%, the effect does not appear because the number of fine denier synthetic or regenerated fibers decreases. On the other hand, if it exceeds 20%, it should be possible to obtain a filter paper for a dust bag having a high collection efficiency and a small pressure loss, but the fine denier synthesis or the amount of regenerated fiber is too large and uneven texture is formed. It is not preferable because it causes a large variation in filtration performance, which lowers the commercial value, and is also expensive. A fiber having a fiber length of 1 to 6 mm, preferably 3 to 5 mm can be used.

Examples of such fine denier synthetic or regenerated fibers include PVA fibers, polyacrylonitrile fibers, polyester fibers, polyamide fibers, regenerated fibers such as rayon, and inorganic fibers such as glass fibers. It is not limited. The cross-sectional shape does not matter, and the presence or absence of crimps does not matter. A particularly preferable example is a polyester fiber, which has a strong affinity with the core polyethylene terephthalate / sheath modified polyester heat-fusible conjugate fiber which is preferably used as the heat-fusible conjugate fiber described later, and therefore has high strength and fineness. A filter paper for a dust bag having a high dust trapping power can be obtained.

The fineness of the heat-fusible composite fiber is 2d or less. If it is larger than this, the ability to capture fine dust is significantly reduced. The blending amount of the heat-fusible composite fiber is 20%.
Must be ~ 50%. When it is less than 20%, the number of the heat-fusible composite fibers is small, the crossing points between the fibers cannot be effectively adhered, and the strength development becomes low. Meanwhile, 5
When the content is more than 0%, the strength is improved, but a binder film is formed and the pressure loss is significantly increased, which is not preferable.
A fiber having a fiber length of 1 to 6 mm, preferably 3 to 5 mm can be used.

Examples of such heat-fusible conjugate fibers include core polyethylene terephthalate / sheath modified polyester, core polypropylene / sheath polyethylene, core polypropylene / sheath polyolefin copolymer, core polyester / sheath polyethylene. However, the present invention is not limited to these. Particularly preferred is a core polyethylene terephthalate / sheath modified polyester heat-fusible composite fiber.

The blending amount of mercerized wood pulp is 10 to 10.
30%. If it is less than 10%, the number of fibers is small and the decrease in fiber packing density, which is a characteristic of mercerized wood pulp, does not appear, and the feature of being inexpensive disappears.
When it is more than 30%, the fiber packing density is remarkably reduced and the pressure loss is sufficiently reduced, but the trapping of fine dust is lowered, which is not preferable as a filter paper for a vacuum cleaner dust bag.

The blending amount of wood pulp is 10 to 65%. If it is less than 10%, the fiber packing density becomes too low, the capturing power of fine dust is remarkably lowered, and it is not preferable, and the feature of being inexpensive disappears. When it is more than 65%, the fiber packing density becomes too high and the capturing power of fine dust increases but the pressure loss becomes large, which is not preferable. Other non-wood fibers such as hemp pulp can also be used in the present invention in place of wood pulp.

[0017] The basis weight of the vacuum cleaner dust bag filter paper of the present invention is a ^{30g / m 2 ~100g / m 2} . 30 g / m
^If it is less than ^2, it is too thin and the ability to capture fine dust is insufficient.
If it exceeds g / m ² , the thickness becomes too thick and the pressure loss increases, which is not preferable.

Further, the fiber packing density is 0.2 to 0.4 cm.
^{It is 3} / cm ³ . If it is less than 0.2 cm ³ / cm ³ , the fiber packing density is too low and the ability to capture fine dust is insufficient, resulting in 0.4 cm ³
If it exceeds / cm ³ , the pressure loss increases, which is not preferable.

The filter paper for the dust collecting bag of the present invention can be easily manufactured by an ordinary wet paper machine. The paper machine used may be any of a cylinder, a short-mesh, a fourdrinier, a birch former, a rotoformer, a hydroformer, etc., and the dryer may be any of a Yankee type, a multi-cylinder type and a through type.

[0020]

EXAMPLES The present invention will be specifically described below with reference to Examples and Comparative Examples, but the present invention is not of course limited thereto.

Examples 1 to 9 NBKP (manufactured by itself) was disintegrated and beaten up to 620 ml by a conventional method to give mercerized wood pulp (RAYONIER FOREST PRODUC).
"POROSANIER-J" manufactured by TS was treated in the same manner.

Polyethylene terephthalate fiber (hereinafter abbreviated as PET) as fine denier synthetic or recycled fiber
(Made by Teijin, "Tepyrus", 0.5d, fiber length 5mm), core polyethylene terephthalate fiber / sheath modified polyethylene terephthalate fiber (hereinafter abbreviated as PET / PET) as a heat-fusible composite fiber (Kuraray, "Sophito N72
0 ", 2d, fiber length 5 mm) was used.

Each of these raw materials was blended in the proportions shown in Table 1, and various types of basis weight filter papers for vacuum cleaner dust collecting bags were produced on a laboratory scale. The fiber packing density, air permeability (pressure loss), The dust collection rate and burst strength were measured. The results are shown in Table 1.

The dust collection rate is JI at a flow velocity of 0.2 m / min.
Using 4 types of test dust specified by S-Z8901, diameter 0.
It was calculated by the following formula from the number of dusts at the sample inlet and the number of dusts at the sample outlet that passed the sample when the dust of 3 μm to 10 μm was generated and passed through the sample. Dust collection rate (%) = (1−A / B) × 100 A: sample outlet dust number B: sample inlet dust number

Pressure loss is replaced by air permeability, JIS-L1004
Attach the sample to the Frazier type breathability tester shown in,
The amount of air (cm ³ / cm ² / sec) passing through 1 cm ² of the sample for 1 ^second when a pressure loss of 1.27 cmH ₂ O was generated. The burst strength was measured by using the Murren burst strength measuring machine indicated by JIS-P8112.

Comparative Examples 1 to 12 The respective raw materials prepared under the same pretreatment conditions as in Examples 1 to 9 were mixed in the proportions shown in Table 2, and various filter papers for vacuum cleaner dust collecting bags were tested. Fabrication was performed on a room scale, and the fiber packing density, air permeability (pressure loss), dust collection rate, and burst strength were measured. The results are shown in Table 2.

[0027]

[0028]

The filter paper for the vacuum cleaner dust bag of the present invention obtained in Examples 1 to 3 is a low basis weight product of Comparative Example 1 (20 g / g).
compared to m ^2), the dust collecting rate was confirmed that over significantly.
It was also confirmed that the air permeability was significantly superior to that of the high basis weight product (120 g / m ² ) of Comparative Example 2.

The filter paper for the vacuum cleaner dust bag of the present invention obtained in Example 3 has a significantly higher dust collection rate than the filter paper of Comparative Example 3 in which the PET fiber diameter is changed from 0.5d to 1.5d. It was confirmed to be superior to.

The filter papers for vacuum cleaner dust collecting bags of the present invention obtained in Examples 3 to 4 are significantly superior in air permeability and dust collecting rate to those of Comparative Example 4 in which the PET fiber content is reduced. It was confirmed that the dust collection rate and burst strength were superior to those of Comparative Example 5 in which the PET fiber content was increased.

The filter papers for the vacuum cleaner dust bag of the present invention obtained in Examples 5 to 6 were more collected than those of Comparative Example 6 in which the fiber diameter of the heat fusible composite fiber was changed from 2d to 4d. It was confirmed that the dust rate was significantly superior. Further, the air permeability is significantly superior to that of Comparative Example 7 in which the blending ratio of the heat-fusible conjugate fiber is increased, and further compared to the product of Comparative Example 8 in which the blending ratio of the heat-fusible conjugate fiber is lowered. It was confirmed that the burst strength was significantly superior.

The filter papers for the vacuum cleaner dust bag of the present invention obtained in Examples 7 to 9 are superior in air permeability as compared with those of Comparative Example 9 in which the blending ratio of the mercerized NBKP is lowered, but further comparison is made. It was confirmed that the dust collection rate and burst strength were superior to those of Example 10 in which the compounding rate of the mercerized NBKP was increased.

Further, it was confirmed that the dust collection rate was significantly superior to that of the product of Comparative Example 11 having a reduced fiber packing density (0.19 cm ³ / cm ³ ), and further the product of Comparative Example 12 having an increased fiber packing density (0 It was confirmed that the air permeability was significantly superior to that of 0.42 cm ³ / cm ³ ).

[0035]

As is apparent from the above description, according to the present invention, synthetic or regenerated fibers of less than 1d 5-2
0%, 2d or less 20 to 50% of heat-fusible composite fiber, 10 to 65% of wood pulp, and 10 to mercerized wood pulp
30% is mixed and the basis weight is 30 to 100 g /
m ² and fiber packing density of 0.2 to 0.4 cm ³ / cm ³ make it an inexpensive vacuum cleaner with high performance of capturing fine dust, low pressure loss and strong strength. A filter paper for a dust bag is obtained.

As described above, the present invention provides a filter paper for an electric vacuum cleaner dust collecting bag, which has extremely excellent filter performance, particularly dust collection rate and air permeability, and is inexpensive, and its industrial value is extremely large. is there.

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[Procedure amendment]

[Submission date] July 15, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction content]

The dust collection rate is JI at a flow velocity of 0.2 m / sec.
Using 4 types of test dust specified by S-Z8901, diameter 0.
It was calculated by the following formula from the number of dusts at the sample inlet and the number of dusts at the sample outlet that passed the sample when the dust of 3 μm to 10 μm was generated and passed through the sample. Dust collection rate (%) = (1−A / B) × 100 A: sample outlet dust number B: sample inlet dust number

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

[0027]

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

[0028]

Claims (1)

Claims: 1. Synthetic or regenerated fiber 5 having a denier of less than 1.
20 wt%, 2 denier or less of heat-fusible composite fiber 20
-50 wt%, wood pulp 10-65 wt%, mercerized wood pulp 10-30 wt%, basis weight 30-1
00g / m ^2, the fiber packing density (fiber content of volume occupied per unit volume) 0.2~0.4cm ³ / cm ³ and to the vacuum cleaner dust bag filter paper, characterized in that the.