JPH0251648B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a filter material for a vacuum cleaner using bag-like paper.

Prior Art Conventional filter materials for vacuum cleaners of this type have used manila hemp, wood pulp, rayon fiber, esparto fiber, and glass fiber as papermaking raw materials. The manila hemp and wood pulp ensure the strength of the paper, the rayon and esparto fibers ensure breathability, and the glass fiber mainly functions to trap dust.

Typical blending ratios of papermaking raw materials are shown below.

Manila hemp 40.9% by weight Wood pulp fiber 13.7 Rayon fiber 33.1 (fiber diameter approximately 12 μm) Esparto fiber 9.8 (approximately 10 μm) Glass fiber 2.6 (approximately 1 to 2 μm) Problems to be solved by the invention Using paper When using filter materials in vacuum cleaners, many conditions are required in terms of their performance. One of the typical characteristics is high dust collection efficiency, and the other is low pressure loss.

Dust collection efficiency is determined by the quotient of the amount of dust remaining in the exhaust air relative to the amount of dust contained in the suction airflow, and therefore,
The better the filter material can capture dust, the higher the dust collection efficiency will be. The dust collection efficiency of the above-mentioned conventional filter materials mainly depends on the diameter of the glass fibers. In other words, the smaller the diameter of the glass fibers, the denser the pores of the paper and the better the ability to trap dust. However, the above-mentioned dust collection efficiency and pressure loss have a contradictory relationship, and as the dust collection efficiency is increased, the pressure loss also increases. For this reason, in the past, rayon or esparto fibers were mixed in to ensure breathability and prevent an increase in pressure loss, but this had a very limited diameter, and in the end, the diameter of the glass fiber was only 1 to 2 μm. It was unusable. As mentioned above, the diameter of the glass fiber affects the diameter dust collection efficiency, and reducing the fiber diameter in order to improve the dust collection efficiency has been impractical due to the relationship with pressure loss.

The inventors investigated and analyzed the reason why the pressure loss suppression effect of rayon and esparto fibers is limited, and found that the fibers cause a hydrogen bond phenomenon. That is, the fibers have hydroxyl groups, and the fibers bond together during the papermaking process, and this bond creates a factor that inhibits air permeability.

The present invention solves these conventional problems, and aims to provide a filter material for a vacuum cleaner that has high dust collection efficiency and low pressure loss.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention has the following features:
At least hemp, glass fiber, and synthetic fibers without hydroxyl groups are used as papermaking raw materials for the paper forming the filter material, and the proportion of the synthetic fibers is set at 10 to 30% by weight.

Effects According to the present invention, since the synthetic fibers do not have hydroxyl groups, there is no hydrogen bonding between the synthetic fibers after paper making, and the original effect of improving air permeability is fully exhibited. Therefore, even if the diameter of the glass fiber is reduced to improve the dust trapping performance, that is, the dust collection efficiency, the pressure loss can be kept below a certain level.

In addition, if the mixing ratio of the above synthetic fibers is less than 10% by weight, it will be difficult to ensure breathability;
If it exceeds 30% by weight, the blending ratio of hemp, which ensures strength, decreases accordingly, making it impossible to ensure strength as a filter material.

Embodiments Hereinafter, embodiments will be described with reference to the accompanying drawings.

In FIG. 1, a filter material 1 is obtained by attaching a mouth plate 4 made of cardboard or the like and having an air intake port 3 to the mouth of a paper 2 formed into a bag shape.

The filter material 1 is installed on the suction side of an electric blower in a vacuum cleaner, specifically in a dust collection chamber,
The mouth plate 4 is set at a predetermined portion with the intake port 3 communicating with a hose insertion port of a vacuum cleaner.

By the way, paper 2 is made by dispersing papermaking raw materials in water to form a suspension, making paper from this to make a sheet, and then processing this into a bag.

To give specific examples of papermaking raw materials, Manila hemp is used to ensure strength, polyester fibers with a length of 2 to 5 mm are used to ensure breathability, and glass fibers with a length of 2 to 3 mm are used to form voids to trap dust. do.

As mentioned above, glass fiber determines the size of the voids that directly contribute to dust capture, and Figure 2 shows the dust collection efficiency ( This figure shows the relationship between pressure loss (white circles) and pressure loss (black circles). In this case, the glass fiber has a diameter of 0.5
~1 mm and 2 to 3 mm in length were blended.

As is clear from the figure, when looking only at the dust collection efficiency, the dust collection efficiency reaches nearly 100% at a value of 5% by weight or more, and drops sharply below that value. Further, even if the amount is 15% by weight or more, there is no change in dust collection efficiency.

On the other hand, the pressure loss is more than 15% by weight, about 200mmAg
It's something that comes close.

From the above, from the viewpoint of dust collection efficiency, the glass fiber blending ratio is preferably 5 to 15% by weight.

Next, in FIG. 3, the glass fiber blending ratio was set to a constant value within the above-mentioned range of 5 to 15% by weight, and the polyester fiber blending ratio was varied under this condition. First, the dust collection efficiency is almost constant and shows a good condition. On the other hand, the pressure loss decreases in inverse proportion to the blending ratio, and hardly changes when it exceeds 30% by weight. The dust collection efficiency that is suitable for practical use as a vacuum cleaner is around 90%, so the minimum blending ratio is
10% is preferred. In addition, the upper limit is set at 30% by weight in order to suppress pressure loss and ensure that the blending ratio of Manila hemp, which guarantees the strength of the filter material, is above a certain level.

The reason why the pressure drop is reduced by blending polyester fibers is thought to be that the fibers do not have hydroxyl groups and do not form hydrogen bonds during paper making. In other words, since there are no hydrogen bonds, the paper as a whole becomes fluffy (high porosity), and its air permeability is significantly increased compared to conventional paper.

Therefore, even if the diameter of the glass fiber is reduced to increase the dust capture rate, that is, the dust collection efficiency, it is possible to maintain a low pressure loss.

It was confirmed that a synthetic fiber other than polyester, such as acrylic, may be used as the synthetic fiber without hydroxyl groups, and the effects in terms of dust collection efficiency and pressure loss would hardly change.

Effects of the Invention As explained above, according to the present invention, there is no increase in pressure loss even if the dust collection efficiency is increased by using glass fibers with a small diameter, and a filter with superior characteristics and high strength can be obtained. It is a material that can be obtained and can be used in a vacuum cleaner for reliable cleaning.

[Brief explanation of drawings]

Figure 1 is a perspective view of a filter material for a vacuum cleaner.
FIG. 2 is a characteristic diagram showing the relationship between dust collection efficiency and pressure loss with respect to the glass fiber blending ratio, and FIG. 3 is a characteristic diagram showing the relationship between dust collection efficiency and pressure loss with respect to the polyester fiber blending ratio. 1...Filter material, 2...Paper.

Claims (1)

[Scope of Claims] 1. At least hemp, glass fiber, and synthetic fibers without hydroxyl groups are used as papermaking raw materials for the paper forming the filter material, and the proportion of the synthetic fibers is 10 to 10.
Filter material for vacuum cleaners set at 30% by weight. 2. The filter material for a vacuum cleaner according to claim 1, which contains 5 to 15% by weight of glass fibers having a fiber diameter of 0.5 to 1 μm. 3. A filter material for a vacuum cleaner according to claim 1, which uses polyester fiber as the synthetic fiber.