JPH057714A - Filter for dust collecting bag of vacuum cleaner - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a filter paper for an electric vacuum cleaner dust collecting bag, which is excellent in all of dust collection rate, air permeability and strength and is low in cost. [Structure] Synthetic or regenerated fiber of less than 1 denier 5-2
0% by weight, PVA-based binder fiber 2 to 20% by weight, wood pulp 10 to 65% by weight and mercerized wood pulp 1
0 to 30% by weight, basis weight 30 to 100 g / m ² ,
Fiber packing density (volume of fiber content per unit volume)
The feature is that it is 0.2 to 0.4 cm ³ / cm ³ .

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 Recently, electric vacuum cleaners using disposable dust collection bags have been widely used due to their ease of dust disposal and their excellent ability to capture fine dust. Conventionally, filter papers for dust collecting bags used in this type of vacuum cleaner include wood pulp, hemp pulp, glass fiber, synthetic or recycled 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 which 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. Balance loss (air permeability),
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 a vacuum cleaner dust-collecting bag which is excellent in all of dust collection rate, air permeability and strength, and is inexpensive.

[0007]

DISCLOSURE OF THE INVENTION As a result of intensive studies to achieve the above object, the present inventor has found that mercerized wood pulp has a flat clogged structure of wood pulp using expensive synthetic or regenerated fibers. It can be spread without any pressure, and it is possible to maintain the pressure loss (air permeability). It is possible to combine synthetic or recycled fibers of ultrafine denier in a specific ratio and to fill the fiber with a density (fiber content per unit volume). It has been found that the dust collection rate can be improved by defining the (volume) in a specific range, and that strength can be imparted without lowering the air permeability by specifying the compounding amount of the PVA-based binder fiber. It has been completed.

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, 2 to 20% by weight of PVA binder fiber, 10 to 65% by weight of wood pulp, and mercer. Chemical wood pulp 10-3
0% by weight, basis weight 30 to 100 g / m ² , fiber packing density (volume of fiber content per unit volume) 0.2 to
The feature is that it is 0.4 cm ³ / cm ³ .

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) Synthetic or regenerated fibers have been used in the past in order to balance the trapping efficiency (dust collection rate) and pressure loss (air permeability) by expanding the flattened wood pulp clogging structure. In the present invention, this is replaced with an inexpensive mercerized pulp, so that wood pulp (for example, NBKP and mercerized NBKP) can be used as a main component, which 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 pulp enhances the capturing power of fine dust and the initial pressure loss is small. (3) By blending a specific amount of PVA-based binder fiber, it is possible to effectively bond the intersection point with synthetic or regenerated fiber or pulp without forming a film that impairs air permeability, resulting in 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, fine denier synthetic or recycled fiber, P
In order to achieve the intended purpose, it is indispensable to mix the VA-based binder fiber in a specific ratio and to set the basis weight and the fiber packing density in a specific range. The thickness and blending amount and the blending amount of mercerized wood pulp are the most important points.

The fineness of fine denier synthetic or recycled fibers is less than 1d, preferably about 0.3d. 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). Below 5%,
Since the number of fine denier synthetic or recycled fibers is reduced, the effect does not appear. On the other hand, if it exceeds 20%, it should be possible to obtain a filter paper for a dust bag that has 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 occurs. This is not preferable because the variation in filtration performance increases and the commercial value decreases, which is more effective. 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 preferred example is PVA fiber, which has good affinity with PVA-based binder fibers described later, and thus provides a filter paper for a dust collecting bag that has high strength and high ability to capture fine dust.

The amount of the PVA binder fiber blended is 2 to
20%. If it is less than 2%, the strength is not sufficiently developed, which is a problem. When the content is more than 20%, the strength is exhibited, but a film is formed, which significantly impairs air permeability. As the PVA-based binder fiber, an ordinary commercially available product can be used.

The blending amount of mercerized wood pulp is 10 to 10.
Must be 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.

[0016] 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.

[0019]

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.

PVA fibers (Kuraray, "VPB032 × 30", 3d, fiber length 3 mm) as fine denier synthetic or recycled fibers, and PVA-based binder fibers (Kuraray, "
VPB105 ^-2 x 3 ", 1d, fiber length 3 mm) was used.

Each of these raw materials was blended in the proportions shown in Table 1, and various kinds 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 in 1 ^second when the 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 11 The respective raw materials prepared under the same pretreatment conditions as in Examples 1 to 9 were blended in the ratios 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.

[0026]

[0027]

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 PVA fiber diameter is changed from 0.3d to 1d. It was confirmed.

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 PVA 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 PVA fiber content was increased.

The filter paper for the vacuum cleaner dust bag of the present invention obtained in Examples 5 to 6 is significantly superior in air permeability to the filter paper of Comparative Example 6 in which the compounding ratio of the PVA binder fiber is increased. Was confirmed. It was also confirmed that the burst strength was significantly superior to that of Comparative Example 7 in which the blending ratio of the PVA-based binder fiber was lowered.

The filter papers for vacuum cleaner dust collecting bags of the present invention obtained in Examples 7 to 9 are superior in air permeability as compared with those of Comparative Example 8 in which the blending ratio of the mercerized NBKP is lowered, and further comparison is made. It was confirmed that the dust collection rate and burst strength were superior to those of Example 9 in which the compounding rate of the mercerized NBKP was increased.

Further, it was confirmed that the dust collection rate and the burst strength were significantly superior to those of Comparative Example 10 having a reduced fiber packing density (0.19 cm ³ / cm ³ ), and the fiber packing density of Comparative Example 11 was increased. It was confirmed that the air permeability was significantly superior to that of the product (0.42 cm ³ / cm ³ ).

[0034]

As is apparent from the above description, according to the present invention, synthetic or regenerated fibers of less than 1d 5-2
0%, PVA binder fiber 2-20%, wood pulp 10-65%, and mercerized wood pulp 10-30%
While混抄the basis weight 30 to 100 g / m ^2, by set in the fiber packing density 0.2~0.4cm ³ / cm ^3, inexpensive high trapping force of the fine dust, the pressure loss is small,
A filter paper for a vacuum cleaner dust bag having high strength and excellent performance is obtained.

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

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 15, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

PVA fibers (Kuraray, "VPB032 x 3", 0.3d, fiber length 3 mm) as fine denier synthetic or recycled fibers, and PVA binder fibers (Kuraray,
"VPB105 ^-2 x 3", 1d, fiber length 3 mm) was used.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[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 3]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction content]

[0026]

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

[0027]

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location D21H 13/16 15/00 27/00

Claims (1)

Claims: 1. Synthetic or regenerated fiber 5 having a denier of less than 1.
-20 wt%, PVA-based binder fiber 2-20 wt%, wood pulp 10-65 wt%, mercerized wood pulp 10-30 wt%, basis weight 30-100 g / 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.