JP2010221177A - Glass fiber filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass fiber filter, which occurs no clogging on filter surfaces of two sides, and in which a binder agent for fire-retardant adhesion is not sticky, and in addition the fire-retardant is applied optimally without increasing price costs. <P>SOLUTION: The filter body has a trilaminar structure of a surface fiber layer, a rear surface fiber layer, and an intermediate fiber layer, and has mass characteristics that when the sum mass of each layer represents M<SB>G</SB>(g), the mass of the fire-retardant represents M<SB>N</SB>(g), the mass of the binder agent represents M<SB>B</SB>(g), and the total mass of these represents M(M=M<SB>G</SB>+M<SB>N</SB>+M<SB>B</SB>), the mass ratio M<SB>B</SB>/M of the mass M<SB>B</SB>of the binder to the total mass M is 15 mass% or less (0<M<SB>B</SB>/M<15/100). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a glass fiber filter that is attached to a range hood or a ventilation fan installed in the vicinity of a kitchen, a kitchen, a cooker, and the like, and more specifically, a glass fiber filter in which a flame retardant is spray-coated on the front and back surfaces. It is about.

  Range hoods and ventilation fans that are driven by a fan are arranged in restaurants, cafeteria kitchens, and home kitchens. When oil content evaporates from cooking fats and oils, fish and meat, a large amount of oil and dust adhere to the surface of the range hood and ventilation fan, and it is necessary to remove it. For this reason, a fiber filter is attached to an appropriate place of a range hood or a ventilation fan, and oil and dust in the exhaust gas are collected by the filter, thereby simplifying the removal operation. This fiber filter is sold as a sold-out product, and has been practically used in a wide range as a rental product configured integrally with a mounting holder.

  As the filter material, a fiber filter that efficiently collects oil and dust in the exhaust is used. In particular, glass fibers are often used as the material for fiber filters in order to prevent deterioration and combustion due to high-temperature oil. Furthermore, in order to prevent the collected oil agent from burning, a flame retardant is carried on the filter surface. In order to support the flame retardant on the glass fiber surface, a mixed agent mixed with a binder agent for attaching the flame retardant is sprayed on the front and back surfaces of the filter material.

  Conventionally, many halogen-based flame retardants have been used as flame retardants, but there has been a problem in that halogen-based substances are scattered to cause environmental pollution. Therefore, recently, as disclosed in Patent Document 1, for example, a phosphoric flame retardant has been proposed as a flame retardant that does not contain halogen and does not cause environmental pollution.

  By the way, when the filter is used for a long time, the binder agent and the flame retardant carried on the fiber filter tend to be gradually peeled off. When the binder agent peels, the fibers constituting the filter are disconnected from each other and the shape of the fiber filter is not maintained. In particular, long-term use of the fiber filter causes many flame retardants to peel off, causing a risk that the oil adhering to the fiber surface burns due to ignition. Accordingly, it is an important matter in manufacturing the filter to firmly bond the fibers with the binder agent and to firmly support the flame retardant on the fiber surface.

Japanese Patent Laid-Open No. 11-253717

  In the case of a glass fiber filter, the fiber bonding binder agent is peeled off by spraying a binder agent when the glass fiber is entangled into a nonwoven fabric in the production stage of the filter fabric to form a binder. Can be prevented.

  On the other hand, the greater the amount of flame retardant applied, the better the flame retardancy, but the raw material costs will increase, so it is necessary to optimize the amount of flame retardant used. However, since the spraying state of the flame retardant changes depending on the amount of the binder agent mixed, there is a problem that it is difficult to optimize the adhesion of the flame retardant. In other words, when the amount of the binder agent is small, the amount of the flame retardant attached decreases in the manufacturing stage. On the other hand, if the binder agent is increased, the fibers on the front and back surfaces are excessively solidified, which may cause clogging. . In particular, even when using a phosphoric acid flame retardant that does not contain halogen and does not cause environmental pollution, the compatibility problem with the binder agent is still unsolved. Depending on the type of phosphoric acid flame retardant, the flame retardant The problem was that the sprayed state of the sticky sticky or the flame retardant component was raised.

  In view of the above problems, the object of the present invention is that the flame retardant is optimally applied without clogging the front and back filter surfaces, without sticking the flame retardant adhesion binder, and without increasing the cost. It is to provide a coated glass fiber filter.

The first embodiment of the present invention is a glass having a three-layer fiber structure in which an intermediate fiber layer in which glass fibers are flexibly bonded is interposed between the front fiber layer and the back fiber layer in which the glass fibers are firmly bonded. In the fiber filter, a mixture of a flame retardant and a binder agent is sprayed and applied to the surface fiber layer and the back fiber layer, and the total mass of the surface fiber layer, the back fiber layer, and the intermediate fiber layer is represented by M _G ( g), when the mass of the flame retardant is M _N (g), the mass of the binder agent is M _B (g), and the total mass of these is M (M = M _G + M _N + M _B ), the binder agent Is a glass fiber filter in which the mass ratio M _B / M of the mass M _{B to} the total mass M is 15 mass% or less (0 <M _B / M <15/100).

According to a second aspect of the present invention, in the first aspect, the mass ratio M _B / M of the mass M _B of the binder agent to the total mass M is 10 mass% or less (0 <M _B / M <10/100). A glass fiber filter.

According to a third aspect of the present invention, in the first aspect, the mass ratio M _B / M of the mass M _B of the binder agent to the total mass M is 5 to 10 mass% (5/100 <M _B / M <10 / 100).

  A fourth aspect of the present invention is a glass fiber filter according to the first, second, or third aspect, wherein the flame retardant is a carbamate flame retardant.

  A fifth aspect of the present invention is the glass fiber filter according to the fourth aspect, wherein the carbamate flame retardant is a polyphosphate carbamate.

  A sixth aspect of the present invention is a glass fiber filter according to any one of the first to fifth aspects, wherein the binder agent is an acrylate ester.

  In the seventh aspect of the present invention, in any one of the first to sixth aspects, the molten glass fiber is ejected from a plurality of spinning nozzles and attached to the rotating roller surface, and the ejection fiber is wound around in a nonwoven fabric shape. After forming a filter material in which the amount of fibers in the front surface layer and the back surface layer is increased with respect to the intermediate layer by adjusting the amount of sprayed fibers and bonding by spraying a binder for binding fibers, it is peeled off from the surface of the rotating roller and dried. The glass fiber filter is formed by cutting a filter raw fabric manufactured in a predetermined shape, and forming the three-layer fiber structure with the surface layer, the back layer and the intermediate layer.

  In view of the above problems, as a result of earnestly examining the mixing conditions of a mixture of a flame retardant and a flame retardant adhesion binder agent, the present inventor, between the surface fiber layer and the back fiber layer firmly bonded together, The present inventors have succeeded in finding a mixing condition capable of obtaining a suitable flame retardant adhesion state in a glass fiber filter having a three-layer fiber structure in which an intermediate fiber layer in which glass fibers are flexibly bonded is interposed.

In the present invention, the surface fiber layer, wherein the total mass of the back surface fiber layer and the intermediate fibrous layer M _{G (g),} the mass of the flame retardant M _{N (g),} the mass of the binder agent M _B ( g) When the total mass of these is M (M = M _G + M _N + M _B ), the mass ratio M _B / M of the mass M _B of the binder agent to the total mass M is a basic parameter.

The present inventors have conducted detecting peel strength test the change of the filter peel strength to binder content, increasing the binder agent exceeds the first threshold value of the mass ratio M _B / M to (15 mass%) Peeling On the other hand, the test results showed that the strength decreased and did not improve. That is, when the mass ratio M _B / M exceeds the first critical value, the peel strength between the surface fiber layer and the back fiber layer decreases, and an extra binder agent is added between the fibers. A phenomenon occurs in which the bonding force is weakened and the form retention force of the three-layer structure is reduced. Therefore, according to the first aspect of the present invention, the mixed agent is mixed under the optimum mixing condition (0 <M _B / M <15/100) in which the mass ratio M _B / M is set to at least 15 mass% or less. Because it is spray-coated, it does not contain extra binder, the filter surfaces on the front and back are not clogged or sticky, and the flame retardant is optimally applied without affecting the form retention of the three-layer structure. It is possible to realize a glass fiber filter that is attached and does not increase the cost.

The present inventors have subjected to a tensile (tearing) strength test for detecting a change of the filter tensile strength to the binder content increases the binding agent exceeds a second threshold value of the mass ratio M _B / M to (10 mass%) However, the test result that the tensile strength did not increase was obtained. That is, when the mass ratio M _B / M exceeds the second critical value, the improvement in tensile strength is slow, and even if the binder agent is added further, the fibers in the entire filter are bound excessively. As a result, a phenomenon that causes clogging easily occurs. Therefore, according to the second aspect of the present invention, since the spray coating is performed with the mixed agent mixed under the optimum mixing condition in which the mass ratio M _B / M is set to at least 10 mass% or less, an extra binder agent is not included. In addition, it is possible to realize a glass fiber filter in which the filter surfaces on the front and back sides are not clogged or sticky, the flame retardant is optimally applied, and the cost is not increased.

The present inventors have flame retardant flaking on the binder content was subjected to a powder落量test for detecting the amount of (hereinafter overlooked also referred flour flaking), the mass ratio M _B / M is an upper limit value (10 mass% When the binder agent is increased beyond), the amount of powder fall of the flame retardant increases, and conversely, when the amount is less than the lower limit (5 mass%), the amount of powder fall decreases. That is, when the mass ratio M _B / M exceeds the upper limit, the amount of the flame retardant to peel off increases, whereas when the mass ratio M _B / M is less than the lower limit, the amount of the flame retardant attached decreases. Therefore, according to the third aspect of the present invention, the mixing is performed under the optimal mixing condition in which the mass ratio M _B / M is set in the predetermined range (5/100 <M _B / M <10/100). Because it is spray-coated with an agent, it does not contain extra binder agent, the filter surfaces of the front and back are not clogged, it is not sticky, and the flame retardant is optimally applied without falling off, and the cost A glass fiber filter that does not increase the cost can be realized.

  According to the fourth aspect of the present invention, since the flame retardant is a carbamate flame retardant, a glass fiber filter that does not contain halogen and does not affect the environment can be realized.

  For the flame retardant according to the present invention, polyphosphate carbamate, ammonium polyphosphate, guanidine phosphate, or the like can be used. In particular, according to the fifth aspect of the present invention, the carbamate-based flame retardant polyphosphate carbamate is used, so that the amount of dust fall is small compared to other flame retardants, and without stickiness. A good tactile sensation can be given and the quality of the filter product can be improved.

According to the sixth aspect of the present invention, since the acrylic ester which is a binder agent excellent in the binding action of the glass fiber and the flame retardant is used, it is not necessary to add an extra binder agent, cost reduction and filter Product quality can be improved.
The glass fiber filter according to the present invention is not limited to a frame-free filter obtained by cutting a glass fiber filter into a predetermined shape, and at least one pair of side edges along opposite sides. The present invention can also be applied to a filter having a frame with a reinforcing frame attached thereto.

According to the seventh aspect of the present invention, molten glass fibers are ejected from a plurality of spinning nozzles and adhered to the surface of the rotating roller, and the fibers are bonded by blowing a fiber binding binder while winding the ejected fibers in a nonwoven fabric shape. Further, after adjusting the amount of sprayed fibers to form a filter material in which the amount of fibers in the front and back layers is increased with respect to the intermediate layer, the filter original fabric produced by peeling off from the rotating roller surface and drying is formed into a predetermined shape. Since the three-layer fiber structure is formed by the front surface layer, the back surface layer, and the intermediate layer, the masses of the front surface fiber layer, the back surface fiber layer, and the intermediate fiber layer are determined as the filter raw material. It is possible to optimize the mixing condition of the mass ratio M _B / M without being affected by variation in the mass of the three-layer fiber structure by appropriately adjusting at the opposite manufacturing stage. The three-layer fiber structure according to the present invention is formed by separately forming at least one of the front surface layer, the intermediate layer, and the back surface layer and combining them at the time of molding to form a three-layer structure. May be.

1 is a schematic external view of a glass fiber filter according to the present invention. It is a figure for demonstrating the manufacturing process of the filter raw fabric of the said glass fiber filter. It is a table | surface which shows the test conditions of the peeling strength test implemented about the filter material of the said glass fiber filter. It is a graph which shows the change of the filter peeling strength with respect to a binder content in the said peeling strength test. It is a figure for demonstrating the test content of the said peeling strength test. It is a table | surface which shows the test conditions of the tension test implemented about the said filter material. It is a graph which shows the change of the filter tensile strength with respect to a binder content in the said tension test. It is a figure for demonstrating the test content of the said tension test. It is a table | surface which shows the test conditions of the dust fall amount test implemented about the said filter material. It is a graph which shows the change of the amount of powder falling of a flame retardant with respect to a binder content in the said amount of powder falling test. It is a figure for demonstrating the test content of the said dust fall test. It is a table | surface which shows the measurement result of the test condition of the dust fall test implemented using various flame retardants, and the powder fall quantity of various flame retardants. It is a bar graph for comparing the average value of the amount of powder falling of various flame retardants in the amount of powder falling test of FIG.

A glass fiber filter according to an embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic external view of a glass fiber filter 1 with a reinforcing frame according to the present embodiment. The glass fiber filter 1 is a range hood filter attached to a waste gas suction port of a range hood, and has a flat rectangular parallelepiped shape as a whole. The filter material is made of glass fiber, and the filter thickness is 5 to 30 mm, preferably 10 to 25 mm, and most preferably 14 to 20 mm. The glass fiber filter 1 is a non-woven fiber filter in which glass fibers are entangled as a whole and the entanglement density between fibers in the vertical direction and the horizontal direction is made different. In the present embodiment, at the stage of forming the base material (original fabric) of the filter body, the entanglement density in the left-right direction is formed to be larger than the up-down direction, and is reinforced on both side edges of the filter body along the up-down direction. Frame 2 is attached. The reinforcing frame 2 is a resin fixing frame formed by welding a resin material along the both side edges, and has a substantially U-shaped cross section covering the end of the side edge. As this resin material, a thermosetting resin such as an epoxy resin, a thermoplastic resin such as polycarbonate, polypropylene (PP), polyethylene (PE), polyphenylene sulfide (PPS), or vinyl chloride can be used.

  FIG. 2 is a view for explaining a manufacturing process of the filter fabric of the glass fiber filter 1. The filter manufacturing apparatus includes a winding roller 3, a plurality of spinning nozzles that are arranged to face the roller rotation surface of the winding roller 3, and eject a small-diameter molten fiber 6, and the spinning nozzles of the winding roller 3. A nozzle reciprocating device (not shown) that reciprocates along the roller axis direction and a binder spraying device that sprays the glass fiber binding binder toward the roller rotation surface are provided. As the winding roller 3, a long drum having a diameter of 1 to 2 m and a width of 2 to 4 m can be used. Several 10 to 500 spinning nozzles are arranged in the spinning nozzle unit 4 so as to face the roller rotation surface, and molten glass fibers 6 supplied from a molten glass fiber reservoir (not shown) are jetted from the spinning nozzles. . The nozzle injection diameter of the spinning nozzle is 2 to 40 μm.

The rotation speed of the winding roller 3 is 40 to 60 rpm. The spinning nozzle unit 4 is reciprocated at a speed of 6 to 10 m / min by a nozzle reciprocating device. The fiber injection speed from the spinning nozzle is 60 to 90 m / min. The binder spraying device comprises a binder spray nozzle 5 disposed so as to face the roller rotation surface. The binder injection nozzle 5 is disposed so as to be movable in parallel with the roller surface in conjunction with the reciprocation of the spinning nozzle unit 4. The binder injection amount by the glass fiber bonding binder injection nozzle 5 is 10 to 30 g / m ² .

  In the manufacturing method of the filter fabric using the filter manufacturing apparatus having the above-described configuration, first, the spinning nozzle is reciprocated along the roller axial direction from a plurality of spinning nozzles (spinning nozzle portion 4), The filter material 8 is formed by obliquely crossing and injecting the jet fibers in a non-woven form, and spraying and bonding and binding the binder agent 7. As the binder agent 7, acrylic resin, urea resin, melamine resin, phenol resin, or the like can be used. After the filter material 8 is formed, the filter material 8 is peeled off from the surface of the rotating roller and dried to produce a filter original. Furthermore, the filter body can be molded to form a filter main body to which no reinforcing material is attached.

The filter body of the glass fiber filter 1 adjusts the amount of attached fibers to the intermediate layer when the molten fibers 6 are ejected and adhered to the rotating surface of the winding roller 3 in the filter material forming step. On the other hand, the surface layer and the back layer are formed with an increased amount of fibers. The adjustment of the fiber amount of each layer, that is, the adjustment of the basis weight (g / m ² ) can be performed by varying the rotation speed of the winding roller 3, the injection speed of the spinning nozzle, or the moving speed of the spinning nozzle section 4. . Therefore, the filter main body has a three-layer fiber structure in which an intermediate fiber layer in which glass fibers are bonded flexibly is interposed between a front fiber layer and a back fiber layer in which glass fibers are bonded firmly. Moreover, in order to prevent combustion of the collected oil agent, the coating process which carries a flame retardant is given to each surface of the said surface fiber layer of the glass fiber filter 1, and the said back surface fiber layer. This coating process is performed by spraying and applying a mixture of a flame retardant and a binder to the front and back surfaces of the filter original. As the flame retardant, polyphosphate carbamate, which is one of the carbamate flame retardants, is used. Moreover, acrylic acid ester is used for the binder agent for a flame retardant coupling | bonding.

Said filter body, said surface fiber layer, the total mass of the back fiber layer and the intermediate fibrous layer M _{G (g),} the mass of the flame retardant M _{N (g),} the mass of the binder agent M _B ( g), when these total mass and _{M (M = M G + M} N + M B), the mass ratio _{M B} / M is less 15 mass% relative to the total mass M of the mass _{M B} of the binder agent (0 _{<M B} / M <15/100).

Further, the filter body comprises a second mass properties mass ratio _{M B} / M relative to the total mass M is less _{10mass% (0 <M B /} M <10/100) of the mass _{M B} of the binder agent To do.

Further, the filter body has a third mass in which a mass ratio M _B / M of the mass M _B of the binder agent to a total mass M is 5 to 10 mass% (5/100 <M _B / M <10/100). It has characteristics.

It will be explained by various verification experiments that the above first to third mass characteristics are useful in applying the flame retardant.
First, the usefulness of the first mass characteristic will be described. FIG. 3 shows test conditions for a peel strength test performed on the filter fabric of the glass fiber filter 1. FIG. 4 shows changes in filter peel strength with respect to binder content in the peel strength test. FIG. 5 shows the test contents of the peel strength test.

In the peel test, as shown in FIG. 5 (5A), a sample piece 10 made of a small filter piece taken from the original filter fabric is prepared, and the surface fiber layer 11 and the back fiber layer provided on the front and back of the intermediate fiber layer 13 are prepared. When a pair of tension assisting pieces 14 are fixed to the end portions of 12 (see FIG. 5B), and the sample pieces 10 are peeled off when the tension assisting pieces 14 are pulled from both sides (FIG. 5C). The peel strength (N) of (see) was determined. As shown in FIG. 3, the mass _{M B} of the binder agent 0,0.88g, 2.00g, 2.82g, 3.95g, sequentially increased to 4.62 g, the total mass of the mass _{M B} of the binder agent The peel strength was measured by changing the mass ratio M _B / M to M in 6 steps from 0% to 23.9%. The mass of the sample piece 10 produced from the raw fabric not subjected to the flame retardant coating treatment is 14.99 g.

As shown in the peel strength measurement results of FIG. 3, the raw fabric peel strength in the case of a sample piece made from a raw fabric not subjected to the flame retardant coating treatment is 8.02 N, whereas the flame retardant the mass _{M N,} and a substantially constant 3.21G～3.62G, when the binder agent gradually increased, raw peel strength higher peel strength (14.8~37.7N) was obtained. It should be noted that, as shown in the graph of change in filter peel strength with respect to the binder content (FIG. 4), the peel strength decreases when the mass ratio M _B / M exceeds the first critical value (15 mass%). . That is, a test result was obtained that, even when the binder agent was increased beyond the first critical value (15 mass%) of the mass ratio M _B / M, the peel strength was lowered and not improved.

According to this peel strength test, when the mass ratio M _B / M exceeds the first critical value, the peel strength between the front fiber layer and the back fiber layer decreases, and an excess binder agent As a result, the bonding force between the fibers is weakened, resulting in a phenomenon that the form retention force of the three-layer structure is lowered. Accordingly, in the glass fiber filter coated with the flame retardant, an extra binder is provided by having the first mass characteristic in which the mass ratio M _B / M is set to at least the first critical value (15 mass%) or less. Glass that does not contain chemicals, does not clog or stick on the front and back filter surfaces, and is optimally coated with a flame retardant without affecting the form retention of the three-layer structure. A fiber filter can be constructed.

  Next, the usefulness of the second mass characteristic will be described. FIG. 6 shows test conditions for a tensile strength test performed on the filter fabric of the glass fiber filter 1. FIG. 7 shows changes in filter tensile strength with respect to binder content in the tensile strength test. FIG. 8 shows the test contents of the tensile strength test.

In the tensile test, as shown in FIG. 8 (8A), when the upper and lower ends of the sample piece 10 are respectively held by a pair of holding members 15 and each holding member 15 is pulled from both sides, the sample piece 10 The tensile (tear) strength (N) at the time of breaking (see (8B) in the figure) was determined. As shown in FIG. 6, as in the case of peel strength test, the mass _{M B} of the binder agent 0,0.88g, 2.00g, 2.82g, 3.95g, was sequentially increased to 4.62 g, the mass ratio M _B / M to the total mass M of the mass M _B of the binder agent were measured to a tensile strength varying in 6 stages from 0% ～23.9%. The mass of the sample piece 10 produced from the raw fabric not subjected to the flame retardant coating treatment is 14.99 g.

As shown in the measurement results of the tensile strength in FIG. 6, the raw fabric tensile strength in the case of a sample piece made from a raw fabric not subjected to the flame retardant coating treatment is 11.13 N, whereas the flame retardant the mass _{M N,} and a substantially constant 3.21G～3.62G, when the binder agent gradually increased, higher tensile strength than the raw tensile strength (14.13~27.33N) was obtained. It should be noted that the tensile strength does not change up to 20 mass% beyond the second critical value (10 mass%) of the mass ratio M _B / M, as shown in the graph of change in filter tensile strength against binder content (FIG. 7). Is a point. That is, even if the binder agent is increased beyond the second critical value (10 mass%), the tensile strength does not increase, but rather, the fibers of the entire filter are excessively bound to cause clogging. The test results were obtained.

According to this tensile strength test, when the mass ratio M _B / M exceeds the second critical value, the improvement in tensile strength is dull. Even if the binder agent is further added, the entire filter is rather This causes a phenomenon in which the fibers are excessively bound to cause clogging. Accordingly, in the glass fiber filter coated with the flame retardant, an extra binder is provided by providing the second mass characteristic in which the mass ratio M _B / M is set to at least the second critical value (10 mass%) or less. A glass fiber filter that does not contain an agent, does not clog or stick to the front and back filter surfaces, is optimally coated with a flame retardant, and does not increase cost costs can be configured.

  Further, the usefulness of the third mass characteristic will be described. FIG. 9 shows test conditions for a dust fall test performed on the filter fabric of the glass fiber filter 1. FIG. 10 shows the change in the amount of powdered flame retardant with respect to the binder content in the amount of powdered test. FIG. 11 shows the test contents of the dust fall test.

In the dust falling test, as shown in FIG. 11, when the sample piece 10 is passed between a pair of rollers 16 arranged so that the gap between them is extremely smaller than the thickness of the original filter, and the number of passes is 10 times. The substance peeled off from the sample piece 10 by each passage was distributed to a flame retardant and a binder agent, and the amount of powdered flame retardant was measured. As shown in FIG. 9, as in the case of peel strength test and the tensile strength test, sequentially mass _{M B} of the binder agent 0,0.88g, 2.00g, 2.82g, 3.95g, to 4.62g increases were measured powder落量mass ratio M _B / M to the total mass M of the mass M _B of the binder agent in the variable to 6 stages from 0% ～23.9%. The mass of the sample piece 10 produced from the raw fabric not subjected to the flame retardant coating treatment is 14.99 g.

As shown in the measurement results of the tensile strength shown in FIG. 9, in the case of a sample piece made from a raw material that is not subjected to a flame retardant coating treatment, of course, there is no dust fall, but the mass _{MN of the} flame retardant is The amount of dust falling increased as the binder agent was gradually increased to a constant value of 3.21 g to 3.62 g. In the change graph of the amount of dust falling with respect to the binder content (FIG. 10), the absolute amount of the amount of dust falling is not used, and the amount of dust falling when 3,21 g of the flame retardant alone is added when the binder agent is not contained. The amount of powder dust converted based on the above is used. It should be noted that if the mass ratio M _B / M exceeds the upper limit (10 mass%) and the binder agent is increased, the amount of flame retardant powder increases, and conversely if it is less than the lower limit (5 mass%) It is a point that is reduced.

According to this powder落量test, when the mass ratio M _B / M exceeds the upper limit value increases the amount of the flame retardant is flaking, whereas it is less than the lower limit value decreases adhesion amount of the flame retardant The phenomenon that occurs. Accordingly, in the glass fiber filter flame retardant is Nurigi, comprises a third mass characteristics set the mass ratio _{M B} / M in a predetermined range _{(5/100 <M B / M <} 10/100) By doing so, no extra binder agent is contained, the filter surfaces of the front and back are not clogged, sticky, and the flame retardant is optimally applied without falling off and raising the cost cost A glass fiber filter can be constructed.

  In order to constitute a glass fiber filter that does not affect the environment, it is preferable to use a flame retardant that does not contain halogen as the flame retardant. Specifically, examples of the flame retardant according to the present invention include polyphosphate carbamate, polyphosphorus Ammonium acid or guanidine phosphate can be used.

  Here, it was verified whether or not there was a difference in the amount of powder falling between these three types of phosphoric acid flame retardants. This verification experiment was performed in the same manner as the above-mentioned dust fall experiment, using an acrylic ester as a binder for binding a flame retardant. FIG. 12 shows the test conditions of the dust fall test performed using various flame retardants and the measurement results of the dust fall performed three times for each flame retardant. FIG. 13 is a bar graph for comparing the average values of the amounts of powders of various flame retardants in the powder amount test of FIG.

As shown in (12A) of FIG. 12, when a mixture of polyphosphate carbamate and a binder is used, the mass ratio M _B / M is blended to 7.3 to 7.9%. Further, when a mixture of ammonium polyphosphate and a binder is used, the mass ratio M _B / M is blended to 7.8 to 8.1%. Furthermore, when a mixture of guanidine phosphate and a binder is used, the mass ratio M _B / M is blended to 6.8 to 7.9%. Therefore, any flame retardant satisfies the first to third mass characteristics in the binder formulation.

  (12B) of FIG. 12 shows the amount of dust fall of each flame retardant obtained by the measurement of the amount of dust explained with reference to FIG. The average amount of powdered guanidine phosphate, carbamate polyphosphate, and ammonium polyphosphate is 0.029 g, 0.035 g, and 0.060 g, respectively, and the amount of powdered powder in the order of guanidine phosphate, carbamate polyphosphate, and ammonium polyphosphate. Increased. According to the appearance or texture inspection by the material of the flame retardant, guanidine phosphate has a hygroscopic property and has a sticky feeling, and may be attached to the bag when stored in the filter storage bag. In the case of carbamate polyphosphate, the amount of dust fall is small (0.04 g or less) like guanidine phosphate, and there is no wettability and a clear feel is obtained, which is suitable for a filter flame retardant. In the case of ammonium polyphosphate, the amount of powder falling was large and the powdery touch was obtained. Therefore, among these three types, the polyphosphate carbamate used in the present embodiment has a relatively small amount of dust fall, and can obtain a good tactile feeling without being sticky, improving the quality of the filter product. It can be said that it contributes to.

  It should be noted that the present invention is not limited to the above-described embodiment, and various modifications, design changes and the like within the scope not departing from the technical idea of the present invention are included in the technical scope. Nor.

  According to the present invention, the first to third mass characteristics are provided, the front and back filter surfaces are not clogged, the flame retardant adhering binder agent is not sticky, and the cost is not increased. In addition, a glass fiber filter having a three-layer fiber structure in which a flame retardant is optimally applied can be provided.

DESCRIPTION OF SYMBOLS 1 Glass fiber filter 2 Reinforcement frame 3 Winding roller 4 Spinning nozzle part 5 Binder injection nozzle 6 Molten fiber 7 Binder agent 8 Filter material 10 Sample piece 11 Surface fiber layer 12 Back surface fiber layer 13 Intermediate fiber layer 14 Tension auxiliary piece 15 Gripping member 16 Laura

Claims (7)

In a glass fiber filter having a three-layer fiber structure in which an intermediate fiber layer in which glass fibers are flexibly bonded is interposed between the surface fiber layer and the back fiber layer in which glass fibers are firmly bonded, the surface fiber layer and The back fiber layer is spray-coated with a mixture of a flame retardant and a binder, and the total mass of the surface fiber layer, the back fiber layer and the intermediate fiber layer is M _G (g), and the mass of the flame retardant is When M _N (g), the mass of the binder agent is M _B (g), and the total mass of these is M (M = M _G + M _N + M _B ), the mass M _B of the binder agent with respect to the total mass M glass fiber filters, wherein the mass ratio _{M B} / M is less _{15mass% (0 <M B /} M <15/100). 2. The glass fiber filter according to claim 1, wherein a mass ratio M _B / M of a mass M _B of the binder agent to a total mass M is 10 mass% or less (0 <M _B / M <10/100). 2. The glass fiber filter according to claim 1, wherein a mass ratio M _B / M of a mass M _B of the binder agent to a total mass M is 5 to 10 mass% (5/100 <M _B / M <10/100). The glass fiber filter according to claim 1, 2 or 3, wherein the flame retardant is a carbamate flame retardant. The glass fiber filter according to claim 4, wherein the carbamate flame retardant is a polyphosphate carbamate. The glass fiber filter according to any one of claims 1 to 5, wherein the binder agent is an acrylic ester. The molten glass fibers are ejected from a plurality of spinning nozzles and adhered to the surface of the rotating roller. While the ejection fibers are wound around the nonwoven fabric, the binder is blown and bonded, and the amount of the ejection fibers is adjusted to the intermediate layer. On the other hand, after forming a filter material having an increased amount of fibers in the front surface layer and the back surface layer, the filter raw material produced by peeling off from the rotating roller surface and drying is cut into a predetermined shape, and the three-layer fiber is formed. The glass fiber filter according to any one of claims 1 to 6, wherein a structure is formed by the front surface layer, the back surface layer, and the intermediate layer.

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