JP2003073971A - Method and apparatus for producing electret-finished product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus for producing an electret- finished product by which the electret-finished product having high quality and high performance can be produced at a low cost. SOLUTION: A suction nozzle 22 in a slit shape is brought into contact with a nonconductive fiber sheet S so as to cross the sheet S in the width direction while traveling the sheet S, and the surface of the sheet S at the reverse side of the contacting part is brought into contact with or soaked into a water surface. The water is sucked by the sucking nozzle 22 so that the water can pass through the sheet in the thickness direction of the sheet, and the resultant nonconductive fiber sheet S is dried to provide the objective electret finished product.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention
More details regarding the manufacturing method and apparatus
That enables the production of processed electret products at low cost
The present invention relates to a method and an apparatus for manufacturing a electret processed product. Conventionally, an electret processed fiber sheet has been used.
For air filters with excellent low pressure loss performance
Used as a material. This electretized fiber
As a sheet manufacturing method, a fiber sheet such as a synthetic fiber nonwoven fabric is used.
A high voltage is applied to the gate and electret is generated by corona discharge.
(See Japanese Patent Application Laid-Open No. 61-102476, etc.)
And high voltage is applied to the film sheet using wire electrodes.
And electretized by corona discharge
After that, the method of making the film sheet into a non-woven fabric
(See Japanese Patent Publication No. 57-14467)
ing. However, electrets by corona discharge
Method is to place a polymer material sheet on the ground electrode
Or moving the needle or wire on its surface
-By applying a high voltage from the electrode,
High electrification because it is more electretized
Unevenness due to gap accuracy between electrode and ground electrode
And electretized sheets may have uneven charging.
There was a problem such as damage to the sheet due to spark discharge.
It was. In addition, high voltage equipment is generally expensive.
In addition, it is expensive for safety maintenance management.
There was a problem of becoming. SUMMARY OF THE INVENTION The object of the present invention is to
Eliminates the problems of the prior art and provides high quality and high performance elect
Electret that enables low-cost production of lettuce products
It is to provide a manufacturing method and apparatus for a processed product. [0006] The present invention for solving the above-mentioned problems
The manufacturing method of the bright electret processed product is a non-conductive fiber
While the sheet is running, a slit-shaped suction nozzle is applied to the sheet.
While contacting the slip across the sheet width direction,
The sheet surface opposite the contact part is in contact with or immersed in the water surface.
And let water pass through the suction nozzle in the sheet thickness direction.
Sucking the water into the non-conductive fiber sheet,
Next, the non-conductive fiber sheet is dried.
Is. In this way, the non-conductive fiber sheet is caused to travel.
While making contact with the slit-like suction nozzle,
The sheet surface on the opposite side of the contact
Soak the water by sucking water from the suction nozzle
To move through the sheet in the thickness direction,
Water can penetrate throughout the thickness direction
The And so that the suction nozzle crosses the sheet width direction
Because it arranges and sucks while running the seat,
The entire sheet thickness direction of water penetration through the sheet
Spread evenly. So dry this sheet
Then, the charge was uniformly and densely charged on the entire sheet surface.
An electret sheet can be obtained. [0008] Further, the osmotic action is a slit-like suction.
Only where the nozzle is in contact with the non-conductive fiber sheet
Achieved with a small aquarium because only partial water suction is required
Large tanks can be dispensed with. Therefore,
The production equipment can be made as compact as possible,
Safe and low cost because conventional high voltage generation equipment is not required
You can Also, the electret processed product of the present invention is manufactured.
The manufacturing apparatus comprises a cloth making means for producing a non-conductive fiber sheet,
A slit-like suction nozzle is sealed on the non-conductive fiber sheet.
The contact portion across the width direction, and the contact portion
The sheet surface on the opposite side of the
For non-conductive fiber sheet that sucks water from suction nozzle
Water permeating means, and drying to dry the non-conductive fiber sheet.
It features a structure in which drying means are continuously arranged, and is compact.
Produce high-quality, high-performance electret processed products
Can. DETAILED DESCRIPTION OF THE INVENTION Non-conductive fiber system used in the present invention.
The sheet is special if it is a sheet made of non-conductive fiber material.
It is not limited to. For example, weave of synthetic fiber or natural fiber
Fiber sheets such as fabrics, knitted fabrics and non-woven fabrics
The Of these, a synthetic fiber sheet is particularly preferable, particularly a melt.
A blown nonwoven fabric or a spunbonded nonwoven fabric is preferred. Also,
For air filters, synthetic fiber nonwovens are preferred.
Especially, melt blown nonwoven fabric for high performance filters
Is preferred. The non-conductive fiber sheet used in the present invention
To fibrillate plastic film
A more fiberized sheet may be used. The material of the non-conductive fiber sheet is non-conductive.
The material is not particularly limited as long as it has a material. Like
Or a volume resistivity of 10 ¹² ・ Ω ・ cm or more, even better
Preferably 10 ¹⁴ · Mainly made of materials with Ω · cm or more
Should be used. For example, polyethylene, polypropylene, etc.
Polyolefin, polyethylene terephthalate, poly
Polyester such as lactic acid, polycarbonate, polystyrene
Polyphenylene sulfide, fluororesin, and
And mixtures thereof. these
Above all, it is mainly made of polyolefin or polylactic acid.
This is preferable in terms of electret performance. Poly
Among olefins, one mainly made of polypropylene is
Layer preferred. For the non-conductive fiber sheet used in the present invention,
Is a hindered amine additive or triazine additive
It is preferable to blend at least one kind. This additive
By adding non-conductive fiber sheet to
Is it possible to maintain high electret performance?
That's it. Of the above two types of additives, hindered arm
As an additive based on poly (poly ([(6- (1,1,3,
3, -Tetramethylbutyl) imino-1,3,5-tri
Azine-2,4-diyl) ((2,2,6,6, -teto
Lamethyl-4-piperidyl) imino) hexamethylene
((2,2,6,6, -tetramethyl-4-piperidi
Le) Imino)] (Ciba Geigy, Kima Soap 944L
D), dimethyl-1- (2-hydroxyethyl succinate)
L) -4-Hydroxy-2,2,6,6-tetramethyl
Piperidine polycondensate (Ciba Geigy, Tinupin 622)
LD), 2- (3,5-di-tert-butyl-4-hydroxy
Cibenzyl) -2-n-butylmalonate bis (1,2,
2,6,6-pentamethyl-4-piperidyl) (Cibaga
Iggy and chinupin 144). As the triazine-based additive, the above-mentioned
Poly [(((6- (1,1,3,3-tetramethylbutane
Til) imino-1,3,5-triazine-2,4-dii
) ((2,2,6,6, -tetramethyl-4-piperi
(Zyl) imino) hexamethylene ((2,2,6,6,-
Tetramethyl-4-piperidyl) imino)]
Gee, Kima Soap 944LD), 2- (4,6-Diff
Enyl-1,3,5-triazin-2-yl) -5
((Hexyl) oxy) -phenol (Ciba-Geigy
Manufactured, chinupin 1577FF)
The Of these, especially hindered amine additives
It is preferable to use it. For the non-conductive fiber sheet, in addition to the above additives
In general, electrification of heat stabilizers, weathering agents, polymerization inhibitors, etc.
Publicly used for non-conductive fiber sheets
Known additives may be added. The above hindered amine additive or tria
The addition amount of the gin-based additive is not particularly limited,
Preferably it is 0.5 to 5% by weight, and further
Preferably it is good to set it as the range of 0.7 to 3 weight%. Addition
If the amount is less than 0.5% by weight, the desired high level of electronics
It becomes difficult to obtain the cleret performance. 5 weight
If you add more than%, the spinning and film-forming properties will deteriorate.
However, it is not preferable because it is disadvantageous in terms of cost. Method for producing electret processed product of the present invention
While traveling a non-conductive fiber sheet,
Cross the slit-shaped suction nozzle in the sheet width direction.
And the sheet surface on the opposite side of the contact area is the water surface.
Touch or immerse and in that state from the suction nozzle
Aspirate water. Aspirate water from the suction nozzle
And water on the opposite side of the part where the suction nozzle is in contact with the sheet
Moves through the sheet in the thickness direction,
Can penetrate into the sheet throughout the thickness direction
The Moreover, so that the suction nozzle crosses the sheet width direction
Placed and sucked while running the seat,
The state where water has penetrated throughout the sheet thickness direction
It can be spread evenly across the surface. Therefore,
When this sheet is dried, the electric charge is uniform over the entire sheet surface.
It becomes an electret sheet charged with high density. By the permeation action using the suction nozzle
The water penetration rate to the non-conductive fiber sheet is 500%
This can be done. The upper limit of the penetration rate is 1
It can be as large as 500%. Here, water is immersed in the non-conductive fiber sheet.
Permeability is defined by the following formula. P (%) = [(Wo-W) / W] × 100 where P: penetration rate Wo: weight of sheet infiltrated with water (g / m ² ) W: Sheet weight (g / m) ² ) Also, the above water penetration into non-conductive fiber sheet
Is the location where the slit-like suction nozzle is in contact with the sheet
A tank that supplies water because it only needs to be done locally
Can be of a small volume, eliminating the need for a large tank. Shi
Therefore, making the manufacturing equipment as compact as possible
it can. The slit width of the slit-like suction nozzle
Is preferably in the range of 0.1 to 5 mm, more preferably
Is 0.3-2 mm, most preferably 0.3-1.5 mm
Range. Slit suction with such slit width
By using a nozzle, a wide non-conductive fiber sheet
Even in the case of water, infiltrate the entire sheet with water to a uniform density.
Low pressure loss, high collection, and surface hair
To obtain electret processed products of good quality without wings
Can do. Suction when the slit width is smaller than 0.1 mm
Machining precision that increases resistance and processes slit width
And it is difficult to infiltrate water to a uniform density.
Become. In addition, if it is wider than 5 mm, it is not guided.
Uniformly infiltrate water in the width direction of the electric fiber sheet
Not only makes it difficult, but also reduces the suction power
Therefore, there is a disadvantage that the suction pump must be enlarged
is there. Also, since the slit width is wide, with suction water
Even non-conductive sheets are sucked and processed stably.
It becomes difficult. Non-conductive fibers of the slit-like suction nozzle
Placement relative to the fiber sheet is arranged across the sheet width direction.
It is not particularly limited as long as it is, but preferably the traveling direction
Making the length of the suction nozzle perpendicular to the (longitudinal direction)
This is preferable in that it can be shortened. More preferably, the sheet width
At the center of the direction is faster than the position of both ears
As is done, a suction slit with a convex curved shape
It is preferable to arrange. With such a configuration
It is possible to achieve uniform processing in the width direction without entering
Yes. In the present invention, the non-conductive fiber sheet
As a method for further improving the water penetration rate,
A dehydration step is interposed between the seepage step and the drying step, and
Repeat the see-through process and the dehydration process more than once.
Yes. Repeat the permeation process and the dehydration process twice or more.
After the drying process, the final infiltration process
Improves permeability and charges evenly with higher density
High quality electret sheet
The The dehydrating means is not particularly limited, but examples
For example, a nip roll, a water absorption roll, and a suction nozzle
Can be performed by suction. This dehydration process is
As mentioned above, it is possible to repeat the permeation process twice or more times.
With this, the non-conductive fiber sheet in the final infiltration process
In addition to improving the water penetration effect, the next drying process
It is also beneficial to improve the drying efficiency in The method for drying the non-conductive fiber sheet has been publicly known.
Any known drying method can be used. For example, hot air
Applying drying method, vacuum drying method, natural drying method, etc.
Yes. Among them, the hot air drying method enables continuous processing.
Therefore, it is preferable. When using hot air drying method, drying temperature
As a temperature that does not deactivate the electret
There is a need. The non-conductive fiber sheet is dried by non-conductive fibers.
Run until the moisture content in the fiber sheet reaches the official moisture content.
Yeah. The drying temperature is preferably 130 ° C. or lower.
Preferably it is 120 degrees C or less, More preferably, it is 100 degrees C or less
It should be down. The dried sheet is electret after drying.
Quickly inside the dryer so as not to deactivate
For example, a drying temperature of 100 ° C. or higher.
Above, it is preferable to discharge within 30 minutes. In the present invention, the non-conductive fiber sheet
As the water used for osmosis treatment, a liquid filter etc.
Remove dirt and make it as clean as possible
It is preferable to use it. Especially ion exchange water, distilled water,
Pure water such as filtered water permeated through a reverse osmosis membrane is preferred. Also,
The level of pure water is 10 in terms of conductivity. ^Three μS / m or less
Preferably, more preferably 10 ² μS / m or less
Things are good. The above water is mixed with a water-soluble organic solvent.
The water permeability to the non-conductive fiber sheet.
The layer can be improved. In this case, the water-soluble organic solvent
The concentration is usually 20% by weight or less. Mixed in water
As a water-soluble organic solvent, the boiling point is lower than the boiling point of water
Are preferred. That is, the water-soluble organic solvent is water
Because it is to improve the permeability to the sheet,
Once infiltrated into the sheet, vaporize and dry as soon as possible
This is because it is preferable. More preferably, with water
The thing whose boiling point difference is 10 degreeC or more low is good. The type of water-soluble organic solvent is a non-conductive type of mixed solution.
If the permeability to the electric fiber sheet is good, it is not particularly limited
Yes. For example, methyl alcohol, ethyl alcohol,
Alcohols such as propyl alcohol, acetone,
Cylethyl ketones, propyl acetate, acetate
Esters such as chill, other aldehydes, carboxylic acids
And the like. Especially in terms of permeability
Choles or ketones are preferred, especially acetone,
At least of propyl alcohol, ethanol
One type is preferably used. More preferably, isop
Those having propyl alcohol as the main component are preferred. FIGS. 1A and 1B show the elect of the present invention.
Non-conductive fiber sheet manufacturing process for manufacturing let processed products
From continuous to electret sheeting in a continuous process
The case where it does is illustrated. In FIGS. 1A and 1B, 1 is non-conductive.
Fabricator for producing conductive fiber sheet S, 2 is non-conductive fiber
Osmosis device for infiltrating water into the sheet S, 3 for excess water
Suction suction nozzle for suction suction, 4 is a drying device
is there. The cloth making apparatus 1 removes the molten polymer from the spinning hole.
Spinning into ultrafine short fibers with a jet of compressed heated air
And a melt blow machine 18 below it.
-Non-conductive sheet-like fiber spun from spinning machine 18
Equipped with net conveyor 19 that collects as fiber sheet S
Is configured to do. The permeation device 2 downstream of the cloth making device 1 is water.
A tank 21 and a slit-like suction nozzle 22 are provided.
Water for infiltration is supplied from the supply pipe 23 to the water tank 21.
After being temporarily stored in the tank 21, the overflow tank 24 starts from the upper edge.
Overflows and drains from the drain pipe 25. The drained water
It can be reused, and only the part taken out of the sheet is provided.
The so-called liquid level control method for supplying
Needless to say. Non-conductive continuously supplied from the cloth making apparatus 1
Fiber sheet S is guided on one side by guide rollers 26, 26.
Travel with the (bottom surface) in contact with the water surface of the tank 21.
On the upper surface side of the non-conductive fiber sheet S in contact with the water surface of
A cup-shaped suction nozzle 22 is in contact. The suction nozzle 22 is connected to a suction pump (not shown).
Bound and non-conductive fiber sheet S width direction
It touches so as to cross in the direction. Non-conductive fibers like this
The suction nozzle 22 in contact with the upper surface of the sheet S is a suction pump.
The lower surface side of the non-conductive fiber sheet S by the suction action of
Suck up the water. Water thicken non-conductive fiber sheet S
Thickness in the sheet S to move so as to penetrate through
Soak the entire surface evenly with water. The suction nozzle 22 is a non-conductive fiber sheet.
Crosses the width S in the width direction and the non-conductive fiber sheet
Since the sheet S runs in the longitudinal direction, the sheet thickness direction
The osmosis action is carried out every corner over the entire sheet surface.
As the shape that the suction nozzle 22 crosses, in the illustrated example,
In addition to the shape that crosses linearly, the central part on the upstream side is convex
Even if it is a shape that crosses in a tilted needle shape, bow shape, arc shape, etc.
Good. The slit width of the suction nozzle is 0.1 to
A width of 5 mm is preferred, more preferably 0.3-2 m.
m, most preferably in the range of 0.3 to 1.5 mm. Non-conductive fiber sheet in which water is infiltrated
S is excessive due to the suction action of the suction nozzle 3 in advance.
After the water is squeezed out, it is transferred to the drying device 4. Dry clothes
In the device 4, a plurality of guide rollers 41 are provided in a zigzag shape.
Heated air is supplied from the supply port 42,
As a result, the inside is heated.
Therefore, the non-conductive fiber sheet transferred to the drying device 4
While the guide roller 41 moves the guide roller 41 in a zigzag shape,
Dried and electretized sheets are transported
The electret sheet 5 wound in a roll
Become. The permeation of water by the suction nozzle 22
The drawing nozzle 22 contacts one side of the non-conductive fiber sheet S;
The sheet surface on the opposite side is in contact with or immersed in water.
Therefore, the water sucked by the suction nozzle 22 is not electrically conductive fiber sheet.
The sheet S is penetrated in the thickness direction.
Just do it. In the embodiment of FIG. 2, the non-conductive fiber sheet S is
By pushing down the guide rollers 26, 26, the water surface
A state where the sheet is immersed for a distance D, and the immersed sheet
The suction nozzle 22 is brought into contact with the upper surface of the S
It is. Also in this case, the non-conductive fiber sheet S
As in the case of Fig. 1, water can penetrate in the sheet thickness direction.
You can. However, the non-conductive fiber sheet S from the water surface
If the immersion distance D is too deep, the workability of the sheet threading
Will be worse and the equipment will be larger, so 10-500mm
It is desirable to make it. More preferably 50-300
It should be mm. As described above, the non-conductive fiber sheet S is placed on the water surface.
When soaking in, the position where the suction nozzle 22 contacts
The non-conductive fiber sheet S as in the embodiment of FIG.
You may make it contact from the lower surface side. In the present invention, the non-conductive fiber sheet S is applied.
Only the part where the suction nozzle 22 contacts
Non-conductive fiber sheath
The distance that the contact S touches the water surface or the distance that it is immersed in the water surface
As always, use of guide rollers 26, 26, etc.
However, it is not necessary to secure a certain distance. Therefore, FIG.
As in the embodiment, the non-conductive fiber sheet S is in contact with the water surface.
The slit width where the suction nozzle 22 contacts the touched distance
It may be a substantial part. like this
Furthermore, the contact distance to the water surface of the non-conductive fiber sheet S is shortened.
As a result, the water tank 21 in the permeation apparatus 2 can be further reduced.
Can be reduced. Of course, the suction nozzle 22
The portion of the non-conductive fiber sheet S that comes into contact is as shown in FIG.
It may be immersed in the water surface. As shown in FIGS. 3 and 5, the non-conductive fiber sheet
When immersing S from the water surface, as in the case of FIG.
The immersion distance D is 10 to 500 mm, more preferable.
Preferably, it is 50 to 300 mm. EXAMPLES Characteristics used in the examples described below
The value is measured by the following measurement method. [Collection performance] Collection performance measuring apparatus shown in FIG.
Measured with This collection performance measuring device is a measurement sample M
Dust collection on the upstream side of the sample holder 11
Connected to the box 12, with a flow meter 13 and a flow adjustment valve on the downstream side
Are connected to each other. Sample
The rudder 11 is provided with a perkuru counter 16, which
Using the perkuturu counter 16 and switching cock 17
The number of dust on the upstream side of the measurement sample M and the downstream
The number of dust on each side can be measured. In measuring the collection performance, the diameter is 0.3 μm.
m standard polystyrene latex powder for dust storage
Fill box 12 and set sample M in holder 11
And the air flow rate will be 1.5m / min.
Adjust the flow rate adjustment valve 14 and adjust the dust concentration to 10,000 ~
40,000 pieces / 2.83 × 10 ^-Four m ^Three (0.01ft ^Three Stability in the range)
The number of dusts upstream of sample M and the dust downstream
N number of particles counter 16 (manufactured by Lion,
KC-01B), measured 5 times, to JIS K-0901
Based on the following formula, the collection performance (%) was obtained. Collection performance (%) = [1- (n / N)] × 100 where n: number of dusts downstream N: number of dusts upstream [average fiber diameter] 100 or more magnified by SEM photograph
The fiber diameter was measured and the average value was determined. EXAMPLE 1 Tria was used as a weathering agent using the continuous production apparatus of FIG.
Gin-based additive (Ciba Geigy, Kima Soap 944)
Made from polypropylene with MI = 700 containing 1%
The basis weight is 40 g / m by the melt blow method. ² , Average fiber
Produced melt blown non-woven fabric with a diameter of 2.0μm and continued
Supply to a permeation device to which pure water is supplied, and contact one side with the water surface
And suction with the suction nozzle in contact with the upper surface.
And soak in water, and finally dry with a drying device.
A lectret meltblown nonwoven was produced. The resulting electret meltblown nonwoven
The cloth collection performance was measured and found to be 99.99%.
It was. Comparative Example 1 The same melt blown nonwoven fabric as in Example 1 was used.
After soaking for a minute, it was drained and dried. Non-woven fabric after treatment
It was 59.7% when we measured collection performance of
Compared to the electret meltblown nonwoven fabric of Example 1
It was very low. Comparative Example 2 The same melt blown nonwoven fabric as in Example 1 was subjected to water penetration treatment and
The collection performance was measured as it was without drying.
However, it was as low as 57.5%. Example 2 The same equipment as in Example 1 was used, and the immersion depth D was 200 m.
set to m. In addition, triazine additives as weathering agents
(Ciba Geigy "Kimasoap 944") 1% included
Using polypropylene with M1 = 900 as a raw material,
40g / m ² , Average fiber diameter 2.2μm
Manufactures melt blown nonwoven fabric and continues to supply pure water
The suction nozzle is supplied to the immersion device and immersed in water.
Penetration of water while sucking (slit width 0.5 mm)
Electrified by dehydration and drying with a drying device.
A letmelt blown nonwoven fabric was produced. The resulting electret meltblown nonwoven
When the collection performance of the cloth was measured, it was as high as 99.999%.
Showed performance. Example 3 Polylactic acid (number average molecular weight 66,100, weight average)
According to Example 2 except that the amount is 120,000)
The basis weight is 40 g / m by the melt blow method. ² 2. Average fiber diameter
Manufacture 5μm melt blown nonwoven fabric and continue dipping equipment
And electret melt by processing in drying equipment
A blown nonwoven was produced. The collection performance of the obtained nonwoven fabric was measured.
The performance was as high as 99.99%. As described above, according to the present invention, non-conductive
While running the fiber sheet, slit the sheet
A suction nozzle in contact with the
The water surface is brought into contact with or immersed in the water surface and water is drawn from the suction nozzle.
By sucking, water penetrates in the sheet thickness direction.
In order to move the water in the thickness direction inside the sheet.
Can penetrate. Moreover, the suction nozzle is a sheet
Arrange across the width and do not run the seat
Since the suction is performed, the entire sheet thickness direction is immersed in water.
Permeability is spread evenly across the entire sheet. Therefore
When this sheet is dried, the charge is uniform over the entire sheet surface.
It is possible to obtain electretized sheets that are charged with high density.
You can. The osmotic action is a slit-like suction.
Only where the nozzle is in contact with the non-conductive fiber sheet
Achieved with a small aquarium because only partial water suction is required
Large tanks can be dispensed with. Therefore,
The production equipment can be made as compact as possible,
Safe and low cost because conventional high voltage generation equipment is not required
You can In the production method of the present invention, water is sucked.
Compared to the method of jetting water.
Small physical impact on fiber sheet, fuzzing, etc.
There is almost no loss of fiber sheet quality due to
The physical properties of the fiber sheet can be used as is.
Yes. This is because the element obtained by the production method of the present invention is
Use ctretized fiber sheet as filter substrate
This is very desirable.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1A and 1B are a schematic side view and a plan view showing a manufacturing process of an electret processed product of the present invention. FIG. 2 is a schematic view showing another embodiment of the permeation device used in the present invention. FIG. 3 is a schematic view showing still another embodiment of the osmosis device used in the present invention. FIG. 4 is a schematic view showing still another embodiment of an osmosis device used in the present invention. FIG. 5 is a schematic view showing still another embodiment of an osmosis device used in the present invention. FIG. 6 is a schematic view showing a collection performance measuring apparatus used in an example of the present invention. [Explanation of Symbols] 1 Non-conductive fiber sheet fabricator 18 Melt blow spinning machine 19 Net conveyor 2 Penetration device 21 Water tank 22 Suction nozzle 3 Dehydration suction nozzle 4 Drying device 5 Electret sheet S Non-conductive fiber sheet

─────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme code (reference) D01F 6/92 301 D04H 3/16 D04H 3/16 D06M 101: 30 // D06M 101: 30 101: 32 101 : 32 7/02 A 5/08 F term (reference) 4D019 AA01 BA12 BA13 BB02 BB03 BC01 CB06 CB07 4L031 AA13 AA18 AB34 BA08 BA33 CA08 4L035 BB42 EE01 JJ19 JJ21 LA01 4L047 AA14 AA21 AA29 AB02 AB03 BA09 CB

Claims (1)

[Claims] [Claim 1] While running a non-conductive fiber sheet, the sheet-like suction nozzle is brought into contact with the sheet so as to cross in the sheet width direction, and the sheet surface on the opposite side of the contact portion is Manufacturing an electret processed product in which water is infiltrated into the non-conductive fiber sheet by allowing water to contact or immerse, sucking water from the suction nozzle so as to penetrate in the sheet thickness direction, and then drying the non-conductive fiber sheet Method. 2. The method of manufacturing an electret processed product according to claim 1, wherein a dehydration step is interposed between the water permeation step and the drying step. 3. At least two of the infiltration step and the dehydration step
The manufacturing method of the electret processed goods of Claim 2 repeated twice. 4. The method for producing an electret processed product according to claim 1, wherein a penetration rate of water into the non-conductive fiber sheet in the penetration step is 500% or more. 5. The method for producing an electret processed product according to claim 1, wherein the non-conductive fiber sheet contains 0.5 to 5% by weight of a hindered amine-based additive or a triazine-based additive. 6. The method of manufacturing an electret processed product according to claim 1, wherein the non-conductive fiber sheet is a sheet made of a synthetic fiber. 7. The method of manufacturing an electret processed product according to claim 6, wherein the sheet made of synthetic fiber is a melt blown nonwoven fabric. 8. The method of manufacturing an electret processed product according to claim 6, wherein the sheet made of synthetic fibers is a spunbonded nonwoven fabric. 9. The method of manufacturing an electret processed product according to claim 1, wherein the non-conductive fiber sheet is mainly composed of polyolefin. 10. The method for producing an electret processed product according to claim 9, wherein the polyolefin is mainly composed of polypropylene. 11. The method of manufacturing an electret processed product according to claim 1, wherein the non-conductive fiber sheet is mainly composed of polylactic acid. 12. The method of producing an electret processed product according to claim 1, wherein the water is ion-exchanged water, distilled water, or filtered water using a reverse osmosis membrane. 13. The method for producing an electret processed product according to claim 1, wherein the water contains a water-soluble organic solvent. 14. The method for producing an electret processed product according to claim 13, wherein the water-soluble organic solvent has a boiling point lower than that of water. 15. The method for producing an electret processed product according to claim 13, wherein the water-soluble organic solvent is mainly composed of alcohols or ketones. 16. The method of producing an electret processed product according to claim 15, wherein the water-soluble organic solvent is at least one of isopropyl alcohol, ethyl alcohol, and acetone. 17. A cloth-making means for producing a non-conductive fiber sheet, and a sheet surface opposite to the contact portion, wherein the non-conductive fiber sheet is brought into contact with the non-conductive fiber sheet so as to cross a slit-like suction nozzle in the sheet width direction. In contact with or immersed in the water surface,
And the manufacturing apparatus of the electret processed goods which consists of the structure which continuously arrange | positioned the water penetration means with respect to the nonelectroconductive fiber sheet which attracts | sucks water from this suction nozzle, and the drying means which dries this nonelectroconductive fiber sheet.