JP2003093290A - Dust collecting bag for vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust collecting bag having no possibility of the breakage of the wet bag during cleaning, which cannot be achieved by conventional dust collecting bags for vacuum cleaners. SOLUTION: The dust collecting bag for the vacuum cleaner has an inner bag and an outer bag, the inner bag is composed of a spunbonded nonwoven fabric which meets requirements (1) to (4): (1) the basis weight is 10-30 g/m<2> ; (2) the wet strengths in the longitudinal and the transverse directions are each >=10 N/5 cm; (3) the wet elongation percentages in the longitudinal and the transverse directions are each >=20%; and (4) the air permeability is >=50 cc/cm<2> s.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a dust bag for an electric vacuum cleaner.

[0002]

2. Description of the Related Art Conventionally, in a disposable dust bag for an electric vacuum cleaner, in order to improve the balance between dust collection efficiency and pressure loss, it has been proposed to use a filter paper having two layers, an inner layer and an outer layer. (For example, Japanese Utility Model Publication No. 6-48556). However, when such a laminated paper is used for the inner bag (inner layer), there is a problem that the inner bag gets wet due to moisture captured during use and the bag is broken, and the function as a dust collecting bag is lost. Was. That is, such a filter paper has a drawback that it does not have sufficient wet strength. Further, if the basis weight and the density are increased in order to improve the strength of the paper in the inner bag and the outer bag, there is a drawback that clogging occurs even in a short use and the pressure loss of the dust collecting bag increases. Also, utility model registration No. 301
No. 9283 proposes a method of using a dry non-woven fabric for the inner bag, but such a dry non-woven fabric is difficult to obtain sufficient strength and tear strength, and is likely to cause damage to the dust collecting bag.

[0003]

An object of the present invention is to provide an inner bag having an excellent balance between dust collection efficiency and pressure loss, and having sufficient wet strength so as not to be broken by moisture trapped during use. To provide a dust bag for an electric vacuum cleaner.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the above-mentioned problems can be solved by using a specific spunbonded nonwoven fabric as an inner bag. did.

That is, the present invention is a dust collecting bag for an electric vacuum cleaner having an inner bag and an outer bag, wherein the inner bag is made of spunbonded nonwoven fabric and satisfies the following (1) to (4). It is a dust collection bag. (1) The basis weight is 10 to 30 g / m ² , and (2) the wet strength in the vertical and horizontal directions is 10 N /
5 cm or more, (3) 20% or more in each of the wet elongations in the vertical and horizontal directions, (4)
The air permeability is 50 cc / cm ² · s or more.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below. The dust collecting bag for a vacuum cleaner of the present invention comprises an inner bag and an outer bag,
It is important to use spunbonded non-woven fabric for the inner bag.
Examples of fibers constituting the spunbonded nonwoven fabric include polyamides such as nylon 6 and nylon 66, polyesters such as polyethylene terephthalate and polybutylene terephthalate, and thermoplastic fibers such as polyolefins such as polyethylene and polypropylene. Polyolefin is preferable because of its excellent strength and heat-sealing property during bag making. Among these, polypropylene single fiber and polypropylene / polyethylene composite fiber are particularly preferable.

Further, as long as the effects of the present invention are not impaired, it is possible to add chemical agents such as antibacterial agents and antifungal agents to such thermoplastic fibers, or to post-treat them after forming them into a nonwoven fabric.

The fiber diameter of the fibers constituting the spunbonded nonwoven fabric is not particularly limited, but in order to secure a better dust collecting property, the average fiber diameter is preferably 10 to 35 μm, more preferably Is 15 to 30 μm. The average fiber diameter referred to in the present invention is an average value obtained by magnifying an image of a nonwoven fabric with a scanning electron microscope (SEM) and measuring the fiber diameter of any 100 fibers.

The unit weight of the spunbonded nonwoven fabric used for the inner bag is 10 to 30 g / m ² , and preferably 12
-25 g / m ² , and more preferably 15-20
g / m ² . If the basis weight is less than 10 g / m ² , the dust collection efficiency is poor and the clogging of the outer bag with dust is prematurely impaired, and the service life of the dust collection bag is significantly impaired. . On the other hand, the basis weight is 30g
If it exceeds / m ² , the pressure loss becomes too high and the filter performance deteriorates. The thickness of the spunbonded nonwoven fabric is 0.10 to 0.30 m from the viewpoint of air permeability.
m is preferred.

The spunbonded non-woven fabric has a wet strength of 10 N / 5 cm in each of the vertical and horizontal directions.
It is above, preferably 15 N / 5 cm or above. If the wet strength is less than 10 N / 5 cm, it may cause bag breakage when sucking a wet product. The wet elongations of the spunbonded nonwoven fabric in the vertical and horizontal directions are 20% or more, and preferably 40% or more. If the wet elongation is less than 20%, bag breakage may occur when a metal piece or the like is inhaled. The vertical direction referred to in the present invention is the MD direction of the nonwoven fabric, and the horizontal direction is the CD direction.

The air permeability of the spunbonded nonwoven fabric is 5
0 / cm ² · s or more, preferably 100 to 70
It is 0 cc / cm ² · s. Air permeability is 50 cc / cm ²
-If it is less than s, the inner bag will be clogged quickly, and the pressure loss will increase greatly with the use time of the vacuum cleaner, which is not preferable. On the other hand, when the air permeability exceeds 700 cc / cm ² · s, the outer bag may be loaded and the pressure loss may increase faster. As described above, when the spunbonded non-woven fabric forming the inner bag of the dust collecting bag of the present invention has the wet strength and the wet elongation in the above range, it occurs when the cleaner sucks dust and water at the same time. It is possible to prevent the inner bag from breaking due to wetting. Furthermore, in the present invention, by using a spunbonded nonwoven fabric having a specific fabric weight and air permeability as the inner bag, an excellent dust collecting bag for a vacuum cleaner having a good balance of dust collecting efficiency and pressure loss can be obtained.

In the spunbonded non-woven fabric, the ratio of the wet strength in the vertical direction to the wet strength in the horizontal direction is
Horizontal = 1.4 to 5 is preferable, and 1.7 is more preferable.
~ 2.5. If the vertical / horizontal strength ratio exceeds 5, the spunbonded nonwoven fabric is likely to be torn, which may cause bag breakage. On the other hand, if the vertical / horizontal strength ratio is less than 1.4, there may be a cost disadvantage in producing the spunbonded nonwoven fabric.

The spunbonded non-woven fabric can be produced using a known apparatus. For example, each component is melt-extruded from an extruder, fibers are spun from a spinneret, and the spun fibers are air-sucker or the like. Of the fiber is collected by a web collecting device such as a net conveyor, and then the web is heated as necessary by using a heating device such as heated air or a heating roll, such as fusion bonding. It can be obtained by processing.

As the outer bag used in the present invention, commonly used filter papers, dry non-woven fabrics, wet non-woven fabrics and the like can be used. Among them, the non-woven fabrics, especially the non-woven fabrics, are excellent in the balance of dust collection efficiency and pressure loss. It is preferable to use a dry non-woven fabric. Above all, the basis weight is 30 to 70 g / m ² , and the air permeability is 5 to 5.
The range of 40 cc / cm ² · s is more preferable in order to balance the dust collection efficiency and the pressure loss. Weight is 30
If it is less than g / m ² , it may be difficult to obtain a sufficient collection capacity. On the other hand, when the basis weight exceeds 70 g / m ² , pressure loss may increase.

When a dry non-woven fabric is used for the outer bag, the material of the non-woven fabric is not particularly limited, and various thermoplastic polymers can be used. From the viewpoint, it is desirable to use the same material for the outer bag material and the inner bag material. Especially, when both materials are made of polypropylene, both can be firmly and economically bonded with heat or hot melt resin, so it is used. This is especially desirable in the sense of preventing the bag from being broken inside. It is also useful from the viewpoint of disposing of the dust collecting bag that the inner bag and the outer bag are all made of a biodegradable resin typified by an aliphatic polyester. In particular, in the present invention, it is preferable from the viewpoint of dust collection efficiency that the nonwoven fabric constituting the outer bag is a laminated nonwoven fabric in which a melt blown nonwoven fabric and a spunbonded nonwoven fabric are laminated on at least one surface thereof.

When the laminated non-woven fabric is used in the outer bag of the present invention, the basis weight of the melt blown non-woven fabric is preferably 5 to 20 g / m ² . If the basis weight is less than 5 g / m ^2, processing may be difficult, and conversely, if the basis weight exceeds 20 g / m ² , pressure loss may increase. Such a melt-blown nonwoven fabric forms a yarn by heating a predetermined thermoplastic polymer to a melting temperature or higher and extruding it under pressure from a nozzle, and further ejecting heated air from the periphery of the polymer nozzle hole while thinning the yarn. It can be manufactured by a general melt blown technique of collecting on a wire mesh.

The basis weight of the spunbonded nonwoven fabric laminated on the meltblown nonwoven fabric is preferably 15 to 30 g / m ² . If the basis weight is less than 15 g / m ² , unevenness may occur on the web, resulting in uneven performance. The basis weight is 30 g / m ^2.
If it exceeds m ² , pressure loss may increase. In addition,
The spunbonded nonwoven fabric has excellent dust collection efficiency when laminated on one or both sides of a meltblown nonwoven fabric,
Lamination on both sides is preferable in order to protect the meltblown nonwoven fabric. By using such a laminated nonwoven fabric as an outer bag,
The dense meltblown nonwoven fabric provides excellent dust collection properties, and the spunbonded nonwoven fabric, which is relatively porous, has excellent dry and wet strength, provides a dust collection bag for a vacuum cleaner having excellent strength and durability.

As a method for producing a laminated non-woven fabric for an outer bag, there are methods of laminating the respective non-woven fabrics and adhering them by hot embossing using a pattern roll, calendering with a flat roll, and the like. Adhesion by embossing is preferable from the viewpoint of maintaining high dust collection efficiency and low pressure loss. The processing temperature at that time is affected by the processing speed, but 10
0 to 150 ° C. is preferable because good adhesion can be achieved. Also, when performing embossing, the embossed area 5 to 25
% Is preferable, and 7 to 15% is more preferable. When the embossed area is less than 5%, a sufficient adhesive effect may not be obtained, and when the embossed area exceeds 25%, the pressure loss may increase due to a decrease in the filtration area. When the laminated nonwoven fabric is used as the outer bag, it is preferable to arrange the spunbonded nonwoven fabric as the outermost layer.

[0019]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. In addition, each physical-property value in an Example is measured by the following method. 1. Pressure loss and collection efficiency The measurement was performed using a suction power measuring device described in JIS C9108-1992. As a vacuum cleaner, a commercially available vacuum cleaner (MC-S62P manufactured by Matsushita Electric Industrial Co., Ltd.) was used, and high-speed wind speed was applied to perform suction and measurement was performed. The pressure loss was defined as the pressure difference between the windward side and the leeward side of the dust bag after 30 g of wheat flour had been charged into the measuring device. The collection efficiency (%) was determined as follows after adding 30 g of wheat flour. Collection efficiency (%) = [Increase in weight of dust bag before and after collection (g)
/ 30 (g)] x 100

2. Wet strength It was measured according to JIS L1906.

3. Wet elongation It was measured according to JIS L1906.

4. Air permeability Measured according to JIS L1096 A method (Fragille type method).

Example 1 Polypropylene resin (MFR = 12 g / 1
0 minutes, JIS K 6758 compliant; 230 ° C, 2.16
(kg load) as a raw material and using a spunbond spinning machine, an average fiber diameter of 21 μm, a basis weight of 17 g / m ² , and a thickness of 0.17 m.
m polypropylene spunbond nonwoven fabric was prepared. The average fiber diameter of 3.5 [mu] m, on both sides of the polypropylene meltblown nonwoven fabric having a basis weight 15 g / ^{m 2,} average fiber diameter of 3.5 [mu] m, basis weight 45 g ^{/ m} 2 formed by laminating a polypropylene spunbonded nonwoven) having a basis weight of 15 g / ^{m 2,} Thickness 0.
A 34 mm laminated non-woven fabric was prepared. The laminated nonwoven fabric was heat-bonded at 125 ° C. with a hot embossing machine having an embossing area of 7% to obtain a laminated nonwoven fabric for outer bag.

The obtained non-woven fabric for inner and outer bags was processed into a dust collecting bag for an electric vacuum cleaner by a usual method. An air inlet having a diameter of 5.2 cm and a support made of hard paper were attached to the outer bag by hot melt to obtain a dust bag for an electric vacuum cleaner of the present invention. The adhesive parts required for bag making were efficiently and firmly integrated by thermocompression bonding.
The results are shown in Table 1.

Example 2 3.3 dtex composite fiber having a core component of polypropylene and a sheath component of polyethylene and having a basis weight of 20 g /
A spunbonded nonwoven fabric having m ² and a thickness of 0.18 mm was prepared as an inner bag. In addition, the weight is 20 g / m ^{2 on} both sides of the polypropylene meltblown nonwoven fabric having a weight of 15 g / m ^2.
Two polypropylene spunbonds were placed and integrated by hot pressing to obtain a laminated nonwoven fabric for outer bag having a basis weight of 55 g / m ² and a thickness of 0.39 mm. These non-woven fabrics were processed in the same manner as in Example 1 to obtain a dust bag for an electric vacuum cleaner.
(Table 1)

Example 3 An outer bag having a basis weight of 51 g / m ² and a thickness of 0.31 mm consisting of 70% by mass of pulp, 25% by mass of short polyethylene terephthalate fibers and 5% by mass of polyvinyl alcohol binder fiber (VPB101 manufactured by Kuraray Co., Ltd.) A dust bag was obtained in the same manner as in Example 1 except that wet paper was used.
(Table 1)

Comparative Example 1 64% by weight pulp, polyethylene terephthalate as inner bag
30% by weight short staple fiber and polyvinyl alcohol bar
20 g / m 2 basis weight consisting of 6% by weight of inder fiber ^Two, Thickness
Same as Example 1 except that 0.13 mm wet paper was used.
In this way, a dust bag was obtained. (Table 1)

Comparative Example 2 As an inner bag, a composite short fiber (3.3 dte) whose core component is polyethylene terephthalate and whose sheath component is polyethylene.
x, 51 mm cut length), embossed basis weight 20 g / m ² with an adhesion area of 20%, thickness 0.20 m
A dust bag was obtained in the same manner as in Example 3 except that the dry nonwoven fabric of m was used. (Table 1)

[0029]

[Table 1]

The dust bag for the vacuum cleaner of the present invention was excellent in both pressure loss and collection efficiency. Also, diameter 9c
m, 2 cm deep ashtray with 3 cigarette butts and 50 cc of water
In addition, a suction test was conducted using an electric vacuum cleaner equipped with the dust collecting bags of the above-mentioned Examples and Comparative Examples. 10 for each dust bag
When the test was performed one by one, no bag was broken when the dust bag of the example was used. On the other hand, when the dust collecting bag of Comparative Example 1 was used, the inner bag was broken in 6 out of 10 bags. Regarding the dust collection bag of Comparative Example 2, 2 out of 10 bags were broken due to peeling of the glued portion.

[0031]

EFFECTS OF THE INVENTION The dust collecting bag for an electric vacuum cleaner of the present invention has a sufficient wet strength of the inner bag so that there is no risk of bag breakage due to water captured during use, and low pressure loss together with the outer bag, Since it has a high dust collection efficiency and a large dust collection capacity, it is extremely useful as a dust bag for an electric vacuum cleaner.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Osamu Nakanishi             3-1, Nihonbashi, Chuo-ku, Tokyo Stocks             Inside the company Kuraray F-term (reference) 3B062 AA08 AB34

Claims (4)

[Claims] 1. A dust collection bag for an electric vacuum cleaner having an inner bag and an outer bag, wherein the inner bag is made of spunbonded nonwoven fabric and satisfies the following (1) to (4). bag. (1) The basis weight is 10 to 30 g / m ² , and (2) the wet strength in the vertical and horizontal directions is 10 N /
5 cm or more, (3) 20% or more in each of the wet elongations in the vertical and horizontal directions, (4)
The air permeability is 50 cc / cm ² · s or more. 2. The outer bag is made of a non-woven fabric having a basis weight of 30 to 70 g / m ² and an air permeability of 5 to 40 cc / cm ² · s.
The dust collection bag for the electric vacuum cleaner described in. 3. The dust collecting bag for an electric vacuum cleaner according to claim 1, wherein the non-woven fabric constituting the outer bag is a melt-blown non-woven fabric and a non-woven fabric in which a spunbonded non-woven fabric is laminated on at least one surface thereof. 4. An electric vacuum cleaner comprising the dust collecting bag for an electric vacuum cleaner according to claim 1.