JPH0616807B2 - Vacuum cleaner dust bag paper - Google Patents

Description

Detailed Description of the Invention A. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to dust-collecting bag paper used in vacuum cleaners and the like.

B. 2. Description of the Related Art In recent years, electric vacuum cleaners using disposable dust-collecting bag paper have been widely used in recent years because of the ease of waste disposal and the ability to capture fine dust.

Conventionally, as dust-collecting bag paper used for this type of vacuum cleaner, paper made of wood pulp, manila hemp, denier chemical fiber and a small amount of polyvinyl alcohol (hereinafter abbreviated as PVA) binder fiber is used. . Such dust-collecting bag paper has a structure in which flat wood pulp is filled with a structure which is usually made of denier compound fiber to balance collection efficiency with initial pressure loss (hereinafter abbreviated as pressure loss), and hemp, P
It is intended to impart strength to paper by using VA binder fiber.

However, such dust-collection bag paper uses pulp, hemp,
Due to the high fineness of the compound fiber, the flattening effect of pulp, hemp, etc., provides good collection efficiency for the number of components, but the lower limit diameter is about 2μ, which is harmful to the human body and has the ability to capture fine dust such as mold spores. Is insufficient and the pressure loss is large. Furthermore, it is important that the dust bag paper is inexpensive because it is disposable, but it is expensive due to the large amount of hemp and compound fibers used, and this type of vacuum cleaner provides a comfortable environment and convenience. It is one of the reasons why the rate of spread is slow compared to the provision.

In order to solve the above-mentioned problems, the inventors of the present invention have prepared a single-layered mixture of an inexpensive wood pulp-based ultrafine denier PVA fiber having a dissolution temperature in water of 90 to 110 ° C. and a small amount of PVA binder fiber. I proposed dust bag paper. That is, the flattened pulp packing structure is appropriately spread with an ultrafine denier PVA-based fiber having a large number per unit weight and a small diameter,
Moreover, the collection efficiency is increased and the pressure loss is reduced by the small number of small mesh structures formed by the fibers and the pulses. However, it was found that such an invention is cheaper than the conventional dust-collecting bag paper and has excellent collection efficiency and pressure loss, but has a short overlife and requires a little smaller pressure loss.

C. Means for Solving the Problems An object of the present invention is to provide a dust-collecting bag paper that is inexpensive, has a high collection efficiency, a small pressure loss, and a long life. That is, the present invention is a dust-collecting bag paper consisting of a paper shaving paper having a coarse and dense structure, more specifically, a fine denier PVA-based fiber of less than 0.5 denier whose dense layer has a dissolution temperature in water of 90 to 110 ° C ( Hereinafter, it is a paper layer having a basis weight of 10 to 30 g / m ² comprising 5 to 40% of ultrafine PVA fiber, 50 to 93% of wood pulp, and 2 to 20% of PVA binder fiber, and a rough layer of 0.5. ~ 5 denier compound fiber (hereinafter usually abbreviated as denier compound fiber) 20 to 70%, wood pulp 30 to 78%, PVA binder fiber 2 to 20%
There is provided a dust collecting bag sheet basis weight of該抄-out combined paper shall apply in conjunction sheet paper making consisting become more basis weight of 25 to 50 g / m ² of the paper layer is 35~60g / m ^2.

The present invention is characterized in that a relatively low basis weight paper layer consisting of ultrafine composite fibers mainly composed of wood pulp and a small amount of PVA-based binder fibers is used for the dense layer, and the dense layer is the dust collecting material of the present invention. It is deeply related to the collection efficiency and pressure loss of bag paper, and the number of fibers per unit weight is large, and the ultrafine composite fibers with a small diameter expand the flattened pulp clogging structure to an appropriate degree. By forming a large number of small mesh structures between the particles, it is possible to efficiently collect fine dust such as mold spores and to have a relatively low basis weight. Is also small. However, such a dense layer alone cannot provide sufficient collection efficiency.

As described above, the inventors of the present invention have proposed a dust collecting bag paper having the same composition as the dense layer as a prior application. However, a grammage of 35 g / m ² or more is required to obtain satisfactory collection efficiency. However, such a grammage caused a problem of excessive pressure loss. Therefore, the basis weight of the dense layer is 10 to 30 g / m ² which allows pressure loss.
In combination with the rough layer, the composition of the rough layer from the viewpoint of collection efficiency, pressure loss, over-life, cost, etc.
As a result of various studies on the basis weight, the present invention has been completed.

The rough layer of the present invention comprises wood pulse, usually denier compound fiber,
A paper layer consisting of a small amount of PVA binder fiber,
A relatively thick, small number of ordinary denier compound fibers open the pulp packing structure relatively widely, and since the mesh structure that appears between such fibers or pulp is large, the pressure loss is small in the coarse layer alone, and the particles It is suitable for collecting dust with a large diameter and has a low collection efficiency for fine dust.

However, the inventors of the present invention are surprised that such a coarse layer has a significant effect of catching a decrease in the collection efficiency of fine dust associated with a decrease in the basis weight in the dense layer as compared with the prior application in combination with the dense layer of the present invention. I found a fact that should be. That is, the collection efficiency of the laminated paper comprising the coarse and dense layer of the present invention is sufficiently satisfactory, and the pressure loss is small because it is almost determined by the dense layer. Further, dust having a large particle size is trapped in the coarse layer and hardly reaches the dense layer, so that it has a long overlife and, in addition, is mainly composed of pulp, which is inexpensive.

Hereinafter, the configuration of the present invention will be described in detail.

The dense layer of the present invention has a basis weight of 10 to 40% of ultrafine PVA-based fibers having a dissolution temperature in water of 90 to 110 ° C and less than 0.5 denier, 50 to 93% of wood pulp, and 2 to 20% of PVA-based binder fibers. For 30 g / m ² paper, the fineness and blending amount of ultrafine PVA-based fibers are important points.

The fibers of the ultrafine PVA-based fiber should be less than 0.5 denier, preferably 0.1 to 0.4 denier.
If it exceeds 0.5 denier, the collection efficiency of fine dust is remarkably reduced, and it cannot be accepted in the market. The drop in collection efficiency above 0.5 denier was too rapid and far beyond expectations.

The amount of such ultrafine PVA-based fibers having a denier of less than 0.5 is 5
Must be ~ 40%. If it is less than 5%, extra fine PVA
The effect is not exhibited because the number of fibers is too small.
On the other hand, if it exceeds 40%, it should be possible to obtain dust-collecting bag paper with high collection efficiency and small pressure loss.
The amount of VA-based fibers is too large, and unevenness in the formation occurs due to formation of spots, and the commercial value is lowered, which is not preferable and is expensive. Fiber length is 1 to 6 mm, preferably 2
It is 4 mm.

In addition to the ultrafine PVA-based fiber, it may contain polyacrylonitrile-based fiber, polyester-based fiber, polypropylene fiber, polyamide-based fiber, or the like. 90 in water
The ultrafine PVA-based fibers having a temperature of ˜110 ° C. have an excellent affinity with the PVA-based binder fiber, and the PVA ultrafine fibers are adhered to each other, so that the strength is further increased.

The dense layer wood pulp content should be between 50 and 93%. If it is less than 50%, the texture of the paper is disturbed, the overperformance is varied, and the features of being inexpensive are lost. 93%
In the above case, the amount of the ultrafine PVA-based fiber is small, the effect is not exhibited, the pressure loss becomes large, and the collection efficiency is low, which is not preferable. Examples of the wood pulp include kraft pulp, sulfite pulp, ground pulp, semi-chemical pulp, thermomechanical pulp obtained from ordinary softwood or hardwood, and the beating degree is 300 to 750 in Canadian Standard Freeness (CSF).
ml is preferred.

The PVA binder fiber should be 2 to 20%, preferably not more than 7%.

If it is less than 2%, the strength of the dust-collecting bag paper is low, and if it exceeds 20%, the strength is high, but a large number of binder films are formed at the intersections of the constituent fibers, which is not preferable because the pressure loss becomes large. As the PVA-based binder fiber, a commercially available ordinary fiber may be used.

The basis weight of the dense layer should be 10 to 30 g / m ² , preferably 15 to 25 g / m ² . If it is less than 10 g / m ^2, it is too thin to reduce the collection efficiency of fine dust, and if it exceeds 30 g / m ² , the pressure loss becomes large, which is not preferable.

The coarse layer of the present invention is usually composed of 20 to 70% denier compound fibers, 30 to 78% wood pulp, and 2 to 2 PVA binder fibers.
In a paper layer having a grammage of 0% and a basis weight of 25 to 50 g / m ² , the denier and blending amount of the denier compound fiber are usually important.

Generally, the fineness of the denier compound fiber should be 0.5 to 5.0 denier. If it is less than 0.5 denier, the pressure loss increases, and if it exceeds 5.0 denier, even a relatively large amount of dust reaches the dense layer and the overlife is shortened. The amount of such fibers should be 20-70%. If it is less than 20%, the pressure loss is large because the filling structure formed of the wood pulp and the PVA binder fiber cannot be sufficiently expanded.
Not preferable. Alternatively, if it exceeds 70%, the collection efficiency is lowered, the over-life is shortened, and more expensive raw material is used as compared with the pulp, so that the cost is increased, which is not preferable. Fiber length is 1
10 mm is preferable.

Examples of such compound fibers include, but are not limited to, recycled fibers such as rayon and various composite fibers in addition to the compound fibers described in the above-mentioned ultrafine compound fibers.
Although the cross-sectional shape is not limited, irregular shapes such as a Y shape and a star shape are more preferable because they have smaller pressure loss than a circular shape. Although it is unknown whether the shape of the cross-section affects it, rayon is an example of a preferable fiber. 30-78% wood pulp
Must. If it is less than 30%, the amount of denier compound fiber is usually large, and as described above, the fine dust is insufficiently captured and the cost is high. If it is more than 78%, the flat wood pulp is large and the clogging is severe and the pressure is high. The loss will increase. As the wood pulp, the wood pulp described in the dense layer may be used.

The PVA type binder fiber should be 2 to 20%, preferably not more than 10%. If it is less than 2%, the strength of the dust-collecting bag paper is weak, and if it exceeds 20%, the pressure loss becomes large as described in the dense layer, which is not preferable. P
As the VA-based binder fiber, a commercially available ordinary fiber may be used.

The basis weight of the rough layer should be 25 to 50 g / m ² . Two
If it is less than 5 g / m ² , the trapping efficiency of fine dust is reduced, and even relatively large dust cannot be sufficiently trapped by the coarse layer and reaches the dense layer, shortening the overlife, and exceeding 50 g / m ^2. Since the basis weight of the dust-collecting bag paper combined with the dense layer becomes large, the pressure loss becomes large, which is not preferable or expensive. The basis weight of the dust collecting bag made by combining the dense layer and the rough layer is 35 to 60 g / m ²
Must. If it is less than 35 g / m ² , the paper layer becomes too thin to capture fine dust, and if it exceeds 60 g / m ² , too much pressure causes excessive pressure loss and is expensive.

The dust-collecting bag paper of the present invention can be easily manufactured by a conventional wet-type paper machine capable of making paper. The wire nets used are circular nets, short nets,
It may be any of Perch-Omer, Moroph-Omer, Hydroformer, etc., and the dryer may be any of Yankee type, foot cylinder type, through type and the like.

D. EFFECTS OF THE INVENTION The dust-collecting bag paper of the present invention has a dense layer composed of ultrafine PVA-based fibers having a melting temperature in water of 90 to 110 ° C., wood pulp, PVA-based binder fibers, and usually denier compound fibers, wood pulp, PVA-based binder fibers. It is a rough-layered laminated paper made of, which is inexpensive and has a small pressure loss,
With the ability to almost completely capture even fine dust,
Even if a large amount of dust is sucked in, the pressure loss is unlikely to increase, so the paper has a long life and is strong enough to withstand use.

The collection effect of this product is JIS-Z89 at a flow rate of 0.85 m ³ / hr.
0.5g of 11 kinds of test dust specified in 01 is inhaled, and it is calculated by the following formula from the amount of dust captured and the amount of dust passing when a sample with a diameter of 10 cm captures dust.

The test dust used in such measurement has a median diameter of about 2 μ, which is comparable to the fine dust such as mold spores whose lower limit diameter is said to be about 2 μ. The pressure loss is the pressure difference (mmH ₂ when the wind speed is 4.3 cm / sec when the sample before dust is attached to the Frazier type tester indicated by JIS-L1018.
O).

The percentages in the present invention are weight percentages unless otherwise stated.

The present invention will be described below with reference to examples.

Examples 1 to 3 and Comparative Examples 1 to 5 are ordinary short-strip-paper machines that can be combined with short-strips.
0.3 denier, 3 mm fiber length, PVA fiber with a melting temperature of 102 ° C in water (hereinafter referred to as VPB032 × 3), 0.6 denier, 3 mm fiber length, PVA fiber with a melting temperature of 102 ° C in water (hereinafter referred to as VBP062 × 3), 1 denier, fiber length 3 mm,
PVA fiber having a melting temperature of 101 ° C. in water (hereinafter referred to as VPB102 × 3), 1.5 denier, rayon obtained by viscose method with a fiber length of 5 mm (hereinafter referred to as rayon 1.5 × 5), 1 denier, fiber length of 3 mm , PVA-based binder fiber having a melting temperature of 60 ° C in water (hereinafter referred to as VPB105-2 x 3),
NBKP with a beating degree of 670 ml (CSF) (hereinafter NBKP (670 m
l)) is used to prepare a dust collecting bag paper having a composition and a basis weight shown in Table 1 (Examples 1 to 3 and Comparative Examples 3 to 5) and a single layer (Comparative Examples 1 and 2). Each was made into paper. Collection efficiency of such dust collecting bag paper, pressure loss, JIS-P-8113
Table 1 shows the measurement results of the tensile strength defined by

In Examples 1 and 2, VPB032 × which is a fine denier dense layer
3 is mixed, and the coarse layer is usually made of denier rayon 1.5 x 5
It is a dust-collecting bag paper consisting of a coarse and dense layer of the present invention, and the collection efficiency, thickness loss, and tensile strength are all satisfactory. Example 3 is a dust collecting paper in which VPB102 × 3 is used instead of the rayon 1.5 × 5 of the rough layer of Example 1, and the pressure loss is slightly increased, but there is no problem in practical use and the tensile strength is Very strong.

In Comparative Example 1, the raw materials for the dense layer and the rough layer of Example 1 were mixed,
Although it is a single-layered paper and the pressure loss does not change much, the collection efficiency is considerably low and it becomes a practical problem. Therefore, it is not possible to obtain a dust-collecting bag paper with good performance simply by mixing the raw materials of Example 1, and it is clear how important it is to combine the dense layer and the rough layer.

In Comparative Example 2, the dense layer of Example 1 is the same as the basis weight of the laminated paper of Example 1, and the collection efficiency is satisfactory, but the pressure loss is large, which is not preferable. In order to compare the over-life, the dust-collecting bag papers of Example 1 and the single-layered Comparative Example 2 which are papermaking sheets having almost the same repair efficiency were mounted on a vacuum cleaner, and a practical test was conducted. As a result, Comparative Example 4 In contrast to the case where the suction force decreased earlier, in Example 1, the suction force did not decrease even when used for a long time, and it was clear that the life was long.

Comparative Example 3 is a dense layer of Example 1 of ultrafine PVA fiber 0.3dr
Instead of (VPB032 × 3), 0.6 dr PVA fiber (V
Although PB062 × 3) is used, the collection efficiency is significantly reduced, and the importance of less than 0.5 dr is clearly shown.

Comparative Example 4 is the one in which the basis weight of the dense layer of Example 1 is low, and Comparative Example 5 is the one in which the amount of ultrafine vinylon in this Example is small, and any of them is collected because it is outside the range of the present invention. Inefficient.

Through the above Examples and Comparative Examples, it is clear how the dust-collecting bag paper according to the present invention has excellent performance.

Claims (2)

[Claims] 1. A laminated paper having a coarse and dense structure,
5-40 finely denier polyvinyl alcohol-based fibers with a dense layer having a dissolution temperature in water of 90-110 ° C and a denier of less than 0.5 denier
%, Wood pulp 50-93%, polyvinyl alcohol-based binder fiber 2-20%, and the basis weight of such layer is 10-30.
g / m ² and coarse layer 0.5-5.0 denier compound fiber
20-70%, wood pulp 30-78%, polyvinyl alcohol binder fiber 2-20%.
25 to 50 g / m ^2, and vacuum cleaners precipitator bag paper is basis weight of the dense layer and the combination papers consisting Araso is 35~60g / m ^2. 2. The vacuum cleaner dust-collecting bag paper according to claim 1, wherein the compound fiber having a denier of 0.5 to 5.0 is rayon.