JP4474171B2 - Silencer structure, manufacturing method thereof, silencer and manufacturing method thereof - Google Patents

Description

  The present invention relates to a muffler structure, a manufacturing method thereof, a silencer, and a manufacturing method thereof. More specifically, the present invention can prevent volume reduction of the sound deadening layer due to contraction of the sound deadening layer, loss of shape due to non-uniform packing density, etc., and can prevent deterioration of the sound deadening performance and improve heat resistance. The present invention relates to a silencing structure that can be used, a method for producing the same, a silencer, and a method for producing the same.

Conventionally, as a silencer structure provided in an exhaust pipe of an automobile internal combustion engine, an injection hole is formed in an end plate of a case constituting the silencer structure, and a glass fiber of long fiber is perforated from the injection hole ( There is known a silencing structure in which a silencing layer is formed by random injection into a space between an inner pipe and a case so as to form a silencing layer by the glass fiber (see, for example, FIG. 3 of Patent Document 1).
However, in the method of injecting the glass fiber in this way, there is a problem that the filling amount of the glass fiber is insufficient or the filling amount in the whole space is uneven, the filling density becomes uneven, and the sound deadening performance is lowered. There is.

  Therefore, there is a method for producing a sound deadening layer in which a bundled fiber in which a large number of glass fibers are bundled with a bundling material is defibrated to form a bulky fiber bundle, and this is wound around the perforated pipe to form a sound deadening layer. It is disclosed (for example, see Patent Document 1). According to such a method, the density of the entire sound deadening layer is equalized as compared with the conventional method in which the glass fiber is filled in the silencer space, and therefore the sound deadening performance is improved.

JP 2000-240426 A

  However, since the fiber bundles defibrated by the method described in Patent Document 1 are not fixed in position between single fibers, the volume of the sound deadening layer is reduced or non-uniform over time. The shape changed to, and the density was uneven. Therefore, the silencing performance tends to be lowered.

  The present invention solves the above-described problems, and prevents volume loss due to shrinkage of the sound deadening layer, loss of shape due to non-uniform packing density, etc., and prevention of sound deadening performance. It is another object of the present invention to provide a silencer structure that can improve heat resistance, a method for producing the same, a silencer, and a method for producing the same.

  As a result of various studies to solve the above problems, the present inventor has introduced an inorganic binder, a low-melting glass, a granular material, etc., thereby preventing adhesion between single fibers defibrated with the granular material. The volume of the sound deadening layer is reduced by the shrinkage of the sound deadening layer, the packing density is uneven, etc. The present inventors have found that it is possible to prevent the loss of shape due to, prevent the deterioration of the silencing performance and improve the heat resistance, and have completed the present invention.

The present invention is as follows.
( 1 ) A defibrated fiber containing a granular material treated with an inorganic binder by adding a granular material treated with an inorganic binder to a bundled fiber composed of a plurality of glass fibers in a bulky shape. A method for producing a sound deadening structure, comprising: obtaining a bundle, winding the defibrated fiber bundle around a material to be silenced, and then curing the inorganic binder contained in the defibrated fiber bundle.
( 2 ) A defibrated fiber bundle containing the inorganic binder and the granular material by adding the inorganic binder and the granular material sequentially or simultaneously while defibrating the converging fiber made of a plurality of glass fibers into a bulky shape. Then, the defibrated fiber bundle is wound around a sound deadening material, and then the inorganic binder contained in the defibrated fiber bundle is cured.
( 3 ) The method for producing a muffler structure according to (1) or (2) , wherein the inorganic binder contains silica and / or aluminosilicate.
( 4 ) The method for producing a muffler structure according to any one of (1) to ( 3 ), wherein a density of the defibrated fiber bundle obtained by curing the inorganic binder is 0.05 to 2.50 in terms of bulk specific gravity. .
( 5 ) The method for producing a muffler structure according to any one of (1) to ( 4 ), wherein an outer peripheral surface of the defibrated fiber bundle obtained by curing the inorganic binder is further impregnated or coated with an inorganic binder.
( 6 ) A bundle of fibers composed of a plurality of glass fibers is deflated in a bulky shape, and a low-melting glass having a softening temperature of 1000 ° C. or lower is added to obtain a defibrated fiber bundle containing the low-melting glass. Next, the defibrated fiber bundle is wound around a sound deadening material, and then the sound deadened material around which the defibrated fiber bundle is wound is heated to soften the low-melting glass to form the defibrated fiber bundle. A method for producing a muffler structure, characterized by being fixed.
( 7 ) The method for producing a muffler structure according to the above ( 6 ), wherein the density of the defibrated fiber bundle fixed is 0.05 to 2.50 in terms of bulk specific gravity.
( 8 ) The method for producing a muffler structure according to ( 6 ) or ( 7 ), wherein an outer peripheral surface of the fixed defibrated fiber bundle is further impregnated or coated with an inorganic binder.
( 9 ) The method for producing a muffler structure according to any one of (1) to ( 8 ), wherein the adding means is spray addition or roll coating.

( 10 ) A silencing structure obtained by the method for producing a silencing structure according to any one of (1) to ( 9 ).

( 11 ) [1] A granular material treated with a defibrated fiber bundle and an inorganic binder obtained by defusing a bundled fiber made of a plurality of glass fibers into a coated tube from one end side of the coated tube into a bulky shape. [2] A powder treated with a defibrated fiber bundle and an inorganic binder obtained by defusing a bundled fiber consisting of a plurality of glass fibers into a coated tube from one end side of the coated tube into a coated tube. While supplying the granules and sucking the gas in the cladding tube from the other end side of the cladding tube, or [3] focusing fibers made of a plurality of glass fibers from the one end side of the cladding tube into the cladding tube By blowing a defibrated fiber bundle obtained by defibrating into a bulky shape and a granular material treated with an inorganic binder, the defibrated fiber is sucked from the other end side of the covering tube by sucking the gas in the covering tube Maintenance And filling the coated tube with powder particles treated with the inorganic binder, and then curing the inorganic binder contained in the defibrated fiber bundle to form a sound deadening layer in the coated tube. A method for manufacturing a silencer.
( 12 ) [1] A defibrated fiber bundle, an inorganic binder and a granular material obtained by defusing a bundled fiber made of a plurality of glass fibers into a cladding tube from one end side of the cladding tube into a bulky shape are blown. [2] Supplying a defibrated fiber bundle, inorganic binder and powder obtained by defusing a bundled fiber consisting of a plurality of glass fibers into a cladding tube from one end side of the cladding tube into a bulky shape At the same time, the gas in the cladding tube is sucked from the other end side of the cladding tube, or [3] the converging fibers made up of a plurality of glass fibers from the one end side of the cladding tube into the cladding tube are broken into a bulky shape. The defibrated fiber bundle, the inorganic binder are obtained by blowing the defibrated fiber bundle, the inorganic binder, and the granular material obtained by fibering and sucking the gas in the coated tube from the other end side of the coated tube. as well as A silencer is formed by filling a powdered granule in the coated tube and then curing the inorganic binder contained in the defibrated fiber bundle to form a sound deadening layer in the coated tube. Method.
( 13 ) [1] A defibrated fiber bundle obtained by defusing a bundled fiber made of a plurality of glass fibers into a cladding tube from one end side of the cladding tube into a bulky shape and a softening temperature of 1000 ° C. or lower By blowing the melting point glass, [2] a defibrated fiber bundle obtained by defusing a bundled fiber made of a plurality of glass fibers into a coated tube from one end side of the coated tube in a bulky shape and a softening temperature of 1000 Supply low-melting glass at ℃ or lower and suck the gas in the cladding tube from the other end side of the cladding tube, or [3] From a plurality of glass fibers into the cladding tube from one end side of the cladding tube A bundle of defibrated fibers obtained by defibrating the resulting bundled fibers into a bulky shape and a low melting point glass having a softening temperature of 1000 ° C. or less are blown, and the gas in the cladding tube is sucked from the other end side of the cladding tube This Thus, the defibrated fiber bundle and the low melting point glass having a softening temperature of 1000 ° C. or less are filled in the cladding tube, and then the cladding tube is heated to soften the low melting point glass to form the defibrated fiber bundle. A muffler manufacturing method, wherein a muffler layer is formed in the cladding tube by fixing.
( 14 ) The method for manufacturing a silencer according to any one of ( 11 ) to ( 13 ), wherein the density of the sound deadening layer is 0.05 to 2.50 in terms of bulk specific gravity.
( 15 ) The method for producing a silencer according to any one of ( 11 ) to ( 14 ), wherein an outer peripheral coating layer is formed by further impregnating or coating an outer peripheral surface of the silencing layer with an inorganic binder.

( 16 ) A silencer comprising the silencer structure according to ( 10 ) above.
( 17 ) A silencer characterized by being obtained by the method for producing a silencer according to any one of ( 11 ) to ( 15 ).

Oite the method for manufacturing a muffler structure by a fiber bundle which has been disintegrated by an inorganic binder for fixing at the junction of each single fiber, it is possible to suppress the volume of the fiber bundle or decrease, changes.
According to the method for producing a silencing structure of the first aspect of the present invention, the volume of the fiber bundle is reduced by keeping the single fibers at a predetermined distance by the granular material dispersed between the defibrated fiber bundles. Can be prevented.
Furthermore, according to the method for producing a silencing structure of the second aspect of the present invention, each single fiber is kept at a predetermined distance by the granular material dispersed between the defibrated fiber bundles, and the defibrated fiber by an inorganic binder. By fixing the bundle, it is possible to prevent a decrease in the volume of the fiber bundle. As a result, according to the method for producing a silencing structure of the first to second aspects of the present invention, it is possible to obtain a silencing structure that is less likely to lose its shape and that can prevent a decrease in silencing performance.
Moreover, in the manufacturing method of the sound deadening structure of the 1st- 2nd this invention, it is the penetration | invasion outstanding between the defibrated fiber bundles by making it into the inorganic binder containing a silica and / or an aluminosilicate as said inorganic binder. By exhibiting the properties and filling properties, it is possible to exert an excellent heat resistance and heat insulation effect.
Furthermore, in the manufacturing method of the silencing structure of the first to second inventions, the density of the defibrated fiber bundle obtained by curing the inorganic binder is set to 0.05 to 2.50 in terms of bulk specific gravity. In addition, the heat resistance can be improved.
Moreover, in the manufacturing method of the sound deadening structure of the 1st- 2nd this invention, it is further heat-resistant by impregnating or coaching an inorganic binder on the outer peripheral surface of the said defibrated fiber bundle which hardened the said inorganic binder. Can be improved.

According to the method for producing a silencing structure of the third aspect of the present invention, the low melting point glass dispersed between the defibrated fiber bundles is softened by heating, and the defibrated fiber bundle is fixed at the contact of each single fiber. can do. As a result, it is possible to obtain a silencing structure that suppresses a decrease or change in the volume of the fiber bundle, has little shape loss, and can prevent a decrease in the silencing performance.
In addition, in the method for producing a silencing structure of the third aspect of the present invention, the density of the fixed defibrated fiber bundle is set to 0.05 to 2.50 in bulk specific gravity, thereby maintaining strength and heat resistance. Can be improved.
Furthermore, in the method for producing a silencing structure of the third aspect of the present invention, the heat resistance can be further improved by impregnating or coating the outer peripheral surface of the fixed defibrated fiber bundle with an inorganic binder.

Furthermore, in the manufacturing method of the silencing structure of the first to third aspects of the present invention, by adding the means for adding by spraying, the position between the single fibers is not changed, and the defibrated fibers are uniform. An inorganic binder and / or a granular material can be applied.

  The silencing structure of the present invention has a structure obtained by the method for producing a silencing structure of any of the above inventions, and, as described in the manufacturing method of each of the inventions, is less deformed, A decrease in the silencing performance can be prevented.

According to the method for manufacturing a silencer of the present invention, a defibrated fiber bundle can be smoothly and uniformly filled in a cladding tube at a high density. As a result, it is possible to obtain a silencer that exhibits particularly good silence, heat insulation and heat resistance. Further, by fixing the defibrated fiber bundles or the defibrated fiber bundles and the granular material with an inorganic binder or the like, it is possible to obtain a silencer that is less likely to lose its shape and has excellent silencing performance.
Moreover, in the manufacturing method of the silencer of this invention, while maintaining the intensity | strength by making the density of the said silencer layer into a bulk specific gravity 0.05-2.50, heat resistance can be improved.
Furthermore, in the method for producing a silencer of the present invention, heat resistance can be further improved by impregnating or coating an outer peripheral surface of the silencer layer with an inorganic binder.
Further, as described above, the silencer of the present invention is less likely to lose its shape and excellent in silence performance.

The present invention will be described in detail below.
[1] Silencing Structure Manufacturing Method and Silencing Structure The “focusing fiber” of the present invention is composed of a plurality of glass fibers. The glass fiber is a fiber comprising SiO ₂ as a main component, as long as it contains SiO ₂ as a main component, may comprise other types of components. Examples of other components include Al ₂ O ₃ , Fe ₂ O ₃ , TiO ₂ , CaO, and Na ₂ O. Moreover, there is no limitation in particular about content of each component in the said glass fiber. For example, the content of SiO _{2 as} the main component is usually 30 to 99% by mass, preferably 40 to 99% by mass, more preferably 50 to 98% by mass, more preferably 60 to 95% by mass, and particularly preferably 70. It is -95 mass%. Specific examples of the glass fiber include glass roving such as “silica glass” and “E glass” by Nippon Glass Fiber Co., Ltd. In addition, the said glass fiber may be single 1 type, and may use 2 or more types together.

  There are no particular limitations on the length, fiber diameter, and number of bundles of the glass fibers constituting the bundled fibers. For example, the diameter of one fiber of the glass fiber is usually 2 to 30 μm, preferably 5 to 30 μm, more preferably 5 to 20 μm, and still more preferably 5 to 15 μm. Further, the length of one glass fiber is preferably a long fiber from the viewpoint of preventing the deformation of the shape, and is usually 10 mm or more, preferably 20 mm or more, more preferably 30 mm or more, and further preferably 50 mm or more. Of course, it is preferable that the lengths and fiber diameters of all the glass fibers constituting the bundling fiber are in the above range, but this need not be the case. Preferably, the number of glass fibers satisfying the above-mentioned length or fiber diameter is 30% or more, preferably 50% or more, more preferably 70% or more, more preferably 80% or more in all glass fibers.

  Further, the number of the glass fibers to be bundled can be appropriately selected according to the use and area to be used, but is usually 500 to 10,000, preferably 500 to 5,000, more preferably 1,000 to 5,000, and still more preferably. 1000 to 4000, still more preferably 1000 to 3000. The bundling fiber may be a bundle of a plurality of glass fibers with an appropriate bundling material, or may be a bunch of fibers by physically entwining them with each other. Good.

In the present invention, the bundling fibers are defibrated into a bulky shape. The phrase “unwrapping the bundled fibers into a bulky shape” means that the bundled glass fibers are unwound and made bulky in order to reduce the bulk density. Here, the bundled fibers are preferably defibrated to a uniform density, and particularly preferably defibrated to a low density. The density of the bundled fiber after the bundled fiber is deflated into a bulky shape is usually 30 to 1000 kg / m ³ , preferably 30 to 700 kg / m ³ , more preferably 30 to 500 kg / m ³ , and still more preferably 50 to 50-. 500 kg / m ³ . When the density is 30 kg / m ³ or more, it is preferable because the volume can be prevented from being increased and the sound deadening structure can be downsized. On the other hand, if the density is 1000 kg / m ³ or less, it is preferable because noise reduction can be improved.

  The means for “defining the bundled fibers into a bulky shape” is not particularly limited as long as the bundled fibers can be defibrated, and any method may be used as necessary. For example, the fibers may be physically defibrated by, for example, squeezing the bundling fibers, or by tapping with a needle-like or plate-like protrusion. In addition, the focused fiber is supplied into the nozzle, and compressed gas (compressed air or the like) is blown into the nozzle, and the focused fiber is loosened by the compressed gas and continuously deflated in a bulky shape from the nozzle. it can. The method of defibrating with a compressed gas such as compressed air is preferable because the density can be easily made uniform and the focused fibers can be defibrated at a low density. In this case, the shape of the nozzle may be any shape, but if the cross-sectional area is larger than the cross-sectional area of the focusing fiber, it is preferable because the fiber is easily defibrated. According to this method, the bundled fibers are continuously sent out from the nozzle while being continuously deflated in a bulky shape, whereby a fiber bundle defibrated in a bulky shape can be obtained continuously.

Next, in the production method (A) of the sound deadening structure, the bundled fibers are defibrated into a bulky shape and an inorganic binder is added to obtain a defibrated fiber bundle containing the inorganic binder. Normally, an inorganic binder is added to the bundled fibers that have been defibrated into a bulky shape at the same time as the bundled fibers are defibrated. However, the order of the defibration and addition of the inorganic binder and the time difference are not particularly limited. In addition, said manufacturing method (A) of a silencing structure is a method other than this invention.

  The “inorganic binder” is not particularly limited in type as long as it can fix a contact between single fibers constituting the defibrated fiber bundle. Specific examples of the inorganic binder include, but are not limited to, those containing silica and / or aluminosilicate. Silica and aluminosilicate are excellent in permeability and filling properties between defibrated fiber bundles and can exhibit heat resistance and heat insulation effects. That is, by covering the surface of the single fiber of the defibrated fiber bundle with an inorganic binder, the heat resistance can be improved, and since the crossing portion between the single fibers is point-bonded with the inorganic binder, As a result, the volume reduction of the entire fiber bundle can be suppressed, and the defibrated fiber bundle can be prevented from being deformed.

  For the above reasons, the inorganic binder is particularly preferably an inorganic binder mainly composed of silica and / or aluminosilicate. Here, “main component” means that the total amount of silica component and / or alumina silicate component is 30% by mass or more, preferably 50% by mass or more, more preferably 60% by mass when the total amount of the inorganic binder is 100% by mass. It means that it is more than%. Here, the silica and the aluminosilicate may contain only one of them or may contain both depending on the purpose. When silica and aluminosilicate are used in combination, a composite ceramic layer having heat resistance and heat insulation properties can be formed between the single fibers to obtain a higher heat resistance heat insulation layer. More specifically, examples of the “inorganic binder” include trade names “NK-bond GF-10” and “NK-bond GF-50” manufactured by Sankyo Pharmaceutical Co., Ltd., as silica-containing inorganic binders. . In addition, the said inorganic binder may be used individually by 1 type, and may be used together 2 or more types.

  The addition amount of the inorganic binder is not particularly limited. Usually, when the defibrated fiber bundle component is 100% by mass, the coating amount of the inorganic binder is usually 10 to 70% by weight, preferably 10 to 50% by mass. Preferably it is 20 to 50 weight%. If the added amount of the inorganic binder is 10% by weight or more, it is preferable that a portion that is not fixed is formed and deformation of the shape can be suppressed. On the other hand, if the added amount is 70% by weight or less, the above effect can be achieved economically. Is preferable. The addition amount of the inorganic binder can be controlled by adjusting the composition and concentration of the solution or slurry-like inorganic binder in addition to the weight to be added.

In the manufacturing method (B) of the silencing structure of the first aspect of the present invention, the bundling fiber is defibrated into a bulky shape, and the powder containing the powder is treated by adding the powder treated with an inorganic binder. Get a fiber bundle. Usually, the bundling fibers are defibrated into a bulky shape, and at the same time, the granular material treated with an inorganic binder is added to the bundling fibers that have been deflated into a bulky shape. There is no particular limitation.

  As long as the above-mentioned object can be achieved, the “powder and granule” is not limited in its type and properties, but is preferably heat resistant and does not shrink by heating. The size of the granular material is usually 5 to 1000 μm, preferably 10 to 700 μm, more preferably 10 to 300 μm, still more preferably 10 to 150 μm, and still more preferably 30 to 150 μm. When the particle size is 5 μm or more, it is preferable because it is easy to maintain a predetermined distance between the single fibers. On the other hand, it is preferable that the particle size is 1000 μm or less because it is easy to uniformly disperse between single fibers. Furthermore, the shape of the granular material is not particularly limited and may be any shape, for example, spherical shape, fibrous shape, flat plate shape, elliptical shape, cylindrical shape, polygonal shape, indefinite shape, etc. A spherical shape is preferable because it is easy to uniformly disperse. In addition, the said granular material may be used individually by 1 type, and may use together 2 or more types from which a material, a particle size, a property, a shape, etc. differ.

  Examples of the granular material include bead-like substances, crushed substances, and fibrous substances. Specific examples of the bead-like substance include spherical particles such as glass particles, particularly glass-based micro hollow spheres (such as “Cell Star” manufactured by Tokai Kogyo Co., Ltd., which is a glass micro hollow sphere of 10 to 250 μm). Of these substances. Examples of the crushed material include mica and other crushed materials having foaming properties such as obsidian, nacre, meteorite, and graphite. Furthermore, examples of the fibrous substance include fibrous substances such as asbestos, ceramic fiber, and potassium titanate (such as “Tofika” manufactured by Otsuka Chemical Co., Ltd., which is 0.5 to 20 μm potassium titanate).

  Although there is no limitation in particular about the addition amount of the said granular material, Usually, when the said defibrated fiber bundle component is 100 mass%, the addition amount of the said granular material is 5-80 mass% normally, Preferably it is 10- It is 50 mass%, More preferably, it is 20-50 mass%. When the added amount of the granular material is 5% by mass or more, as a result of sufficiently filling the granular material between the single fibers of the defibrated fiber bundle, it is possible to increase the volume and suppress the deformation due to shrinkage. On the other hand, when it is 80% by mass or less, the powder is economically sufficiently filled between the single fibers of the defibrated fiber bundle, so that the volume is increased and the deformation due to shrinkage is suppressed. This is preferable because it is possible to suppress the occurrence of problems such as scattering by the granular material used.

In the method for producing a silencing structure of the first aspect of the present invention, the powder is added after being treated with an inorganic binder. Thereby, the said granular material can be adhere | attached between the single fibers of the said defibrated fiber bundle. There is no particular limitation on the method for treating the powder particles with an inorganic binder as long as the powder particles that can be bonded between the single fibers of the defibrated fiber bundle can be obtained. For example, the method of spraying the said inorganic binder on the said granular material previously, and sprinkling the said inorganic binder on the surface of the said granular material is mentioned. Moreover, about the said inorganic binder, the inorganic binder explained in full detail by description of the manufacturing method (A) of the above-mentioned sound deadening structure can be used. In addition, the said inorganic binder may be used individually by 1 type, and may use 2 or more types together.

Furthermore, in the manufacturing method (C) of the silencing structure of the second aspect of the present invention, the bundled fibers are defibrated into a bulky shape, and the inorganic binder and the powder are added sequentially or simultaneously, whereby the inorganic binder and the powder are added. A defibrated fiber bundle containing granules is obtained. Normally, an inorganic binder and a granular material are added at the same time as the bundling fibers are defibrated into a bulky shape, but there is no particular limitation on the order of the defibration, the addition of the inorganic binder and the granular powder, and the time difference. In addition, the types and addition amounts of the inorganic binder and the granular material are described in detail in the description of the above-described method for producing a silencing structure (A) and the method for producing a silencing structure of the first invention (B). The inorganic binders and powders described can be used.

  Furthermore, when adding the said inorganic binder and a granular material, both can be added simultaneously, but either one may be added simultaneously with the defibration of a bundling fiber, and the other one may be added later. For example, the inorganic binder may be applied simultaneously with the defibration of the bundling fibers, and then the powder particles may be added. Or you may add the said granular material simultaneously with the fibrillation of bundling fiber, and add the said inorganic binder after that. In particular, when both the inorganic binder and the granular material are added simultaneously with the defibration of the bundled fibers, the production is easy and the inorganic binder and the granular material can be uniformly dispersed between the single fibers. preferable.

In the method for producing a silencing structure according to the third aspect of the present invention, the low-melting glass having a softening temperature of 1000 ° C. or lower is added to the low-melting glass having a softening temperature of 1000 ° C. or lower while defibrating the converging fiber composed of a plurality of glass fibers. An anti-fiber bundle having a melting point glass dispersed therein is obtained. Usually, the low melting point glass is added simultaneously with the defibration of the bundled fibers in a bulky shape, but there is no particular limitation on the order of addition of the defibration and the low melting point glass and the time difference.

The low melting point glass is not particularly limited in terms of its material, properties, etc., as long as it can be softened at the softening temperature by heating and the single fibers constituting the defibrated fiber bundle can be fixed at the contact points. The softening temperature is a temperature at which the single fibers constituting the defibrated fiber bundle can be fixed to each other at a contact point by being softened by heating. And in this invention, the said softening temperature is 1000 degrees C or less, Preferably it is 800 degrees C or less, More preferably, it is 700 degrees C or less, More preferably, it is 300-700 degreeC. Specific examples of the low-melting glass include amorphous low-melting glass (borate glass, hydrous phosphate glass, tellurite glass, chalcogenite glass, B ₂ O ₃ —PbO—ZnO, B ₂ O _3. -PbO-SiO ₂ system, and _{B 2 O 3 -PbO-SiO 2} -Al 2 O 3 -ZnO system, etc.) or a crystalline solder glass _(ZnO-B 2 O 3 -PbO based crystallized glass, ZnO-B ₂ O ₃ —SiO ₂ -based crystallized glass) and the like (see “Glass Handbook” [Issuing Office; Asakura Shoten Co., Ltd., 1981, 4th edition), pages 143 to 151]. In addition, the said low melting glass may be used individually by 1 type, and may be used together 2 or more types.

In the method for manufacturing a muffler structure of each invention like the above, a method of adding the inorganic binder, granule or low melting point glass is not particularly limited. Examples of the method for adding the inorganic binder, the granular material, or the low-melting glass include spraying, dipping, brushing, knife coating, and roll coating using various roll coaters. Among these, when the addition is performed by spraying or roll coating, the inorganic binder, the granular material, or the low melting point glass is added uniformly between the defibrated fibers while suppressing the change in the position between the single fibers. This is preferable. In particular, the method for adding the low-melting glass is usually to prepare a solution in which a binder and the low-melting glass are dispersed in a solvent such as water, and spray, dip, brush, or knife coat the solution. , And roll coating. Moreover, as a means to add an inorganic binder and a granular material simultaneously, you may add after mixing an inorganic binder and a granular material, or may add simultaneously by spraying etc. from a separate container, for example. Good.

In the manufacturing method of the muffling structure of the present invention such as described above, each fibrillated fiber bundle obtained as described above, is wound around the object to be sound-deadening material. By winding the defibrated fiber bundle around the sound deadening material, the sound deadened material can be easily wrapped with the defibrated fiber bundle, and the sound deadened material can be silenced with good performance. As a method for winding the defibrated fiber bundle, any means may be used, but the defibrated fiber bundle is supplied to the sound deadening material while rotating the sound deadened material around the axis of the sound deadened material. Then, it is preferable because a defibrated fiber bundle can be easily wound around the sound deadening material with a uniform density. In this case, the rotating means of the sound deadening material is not particularly limited, and it can be performed by a desired rotating means, and any means can be used as the supplying means of the defibrated fiber bundle, but the defibrated by the traverse mechanism in particular. Supplying the fiber bundle by reciprocating in the axial direction of the sound deadening material is preferable because the defibrated fiber bundle can be easily wound at a uniform density. The winding amount of the defibrated fiber bundle is appropriately selected according to the sound deadening material and application. In particular, if the number of reciprocations is appropriately set by a traverse mechanism, the winding amount of the defibrated fiber bundle can be easily changed to single, double, or triple or more.

  Further, when the defibrated fiber bundle is wound around the sound deadening material, the defibrated fiber bundle can be supplied with tension applied by a tension roller. For example, the defibrated fiber bundle is drawn by a supply roller or the like, the drawn fiber bundle is passed between tension rollers, and the tip is supplied to a sound deadening material and wound. By providing the tension roller in this way, the density and weight of the fiber bundle wound around the sound deadening material can be easily adjusted by adjusting the tension of the tension roller. Depending on the density required for the sound deadening structure, the tension roller may not be used. That is, only the friction between the defibrated fiber bundle and the member supplying the bundle may be used.

  Further, the defibrated fiber bundle may be wound in a single bundle shape, but may be wound by using a plurality of bundles such as two bundles and three bundles at the same time in consideration of productivity. Moreover, the installation form, layer thickness, shape, and the like of the silencing structure formed by winding the defibrated fiber bundle are not particularly limited as long as the silencing effect is exhibited. For example, examples of the shape of the silencing structure include a cylindrical shape, a rectangular tube shape, and a tapered tube shape. The thickness of the sound deadening structure can be appropriately selected according to the material to be silenced and the application, but is usually 1 to 80 mm, preferably 1 to 50 mm, more preferably 5 to 50 mm, and still more preferably 5 -30 mm, even more preferably 10-30 mm. Further, the sound deadening structure may be provided over the entire length of the sound deadening material in the axial direction, or may be provided in a part of the sound deadening material in the axial direction.

In the manufacturing method of the silencing structure of the first to second present inventions, after winding, the inorganic binder contained in the defibrated fiber bundle is cured. There is no particular limitation on the curing method, and various conditions may be used depending on the conditions such as the type of the inorganic binder used. In the above-described method (A) for producing a silencing structure, the position between the single fibers is fixed because the inorganic binder is used to fix the defibered fiber bundle at the contact points between the single fibers. As a result, the volume of the fiber bundle can be suppressed from decreasing or changing, and there is little loss of shape. As a result, it is possible to prevent a decrease in the silencing performance.
Moreover, in the manufacturing method of the silencing structure of 1st this invention, a granular material disperse | distributes between the single fibers of a defibrated fiber bundle by adding a granular material to the bundling fiber disentangled in the bulky shape. At the same time, the contact points between the powder particles and the defibrated single fibers are bonded and fixed by the inorganic binder, so that the distance between the single fibers can be kept at a predetermined distance by the powder particles. As a result, it is possible to prevent the volume of the fiber bundle from being reduced, to reduce the shape loss, and to prevent the noise reduction performance from being lowered.
Furthermore, in the method for producing a silencing structure of the second aspect of the present invention, the powder particles hold each single fiber at a predetermined distance, hold the entire defibrated fiber bundle, hold the volume, and lose shape. In addition, by suppressing clogging, it is possible to improve the silencing function.

In the method for producing a sound deadening structure according to the third aspect of the present invention, the sound deadening material around which the defibrated fiber bundle is wound is heated to soften the low-melting glass to fix the defibrated fiber bundle. The heating conditions and method are not particularly limited as long as the low-melting glass can be softened to fix the defibrated fiber bundle. According to the method for producing a silencing structure of the third aspect of the present invention, the low melting point glass is softened by heating, and the single fibers constituting the defibrated fiber bundle can be fixed at the contact points. It is possible to suppress the volume of the material from decreasing or changing, and there is little loss of shape. As a result, it is possible to prevent a decrease in the silencing performance.

  In the method for producing a sound deadening structure of the present invention, the density of the defibrated fiber bundle obtained by curing the inorganic binder or the fixed defibrated fiber bundle is not particularly limited, and may be various ranges as necessary. Can do. Usually, the density of the defibrated fiber bundle obtained by curing the inorganic binder or the fixed defibrated fiber bundle is 0.05 to 2.50, preferably 0.05 to 2.0, more preferably 0 in terms of bulk specific gravity. 0.1 to 1.8, more preferably 0.1 to 1.5. By setting the density within the above range, it is preferable because strength can be maintained and heat resistance and heat insulation can be improved.

  In the method for producing a sound deadening structure of the present invention, the outer surface of the defibrated fiber bundle obtained by curing the inorganic binder or the fixed defibrated fiber bundle can be further impregnated or coated with an inorganic binder. Thereby, the heat resistance and heat insulation of a sound deadening structure can be improved further. This is presumed to be due to the formation of an outer peripheral coating layer on the outer peripheral surface of the defibrated fiber bundle by impregnating or coating the outer peripheral surface of the defibrated fiber bundle with an inorganic binder. There is no intention to limit the present invention. The kind of the inorganic binder is not particularly limited, and normally, as already described in detail, the inorganic binder capable of fixing the contact between the single fibers constituting the defibrated fiber bundle can be used.

The silencing structure of the present invention is obtained by the method for producing a silencing structure of the present invention. For this reason, as described in the manufacturing methods of the above inventions, the volume of the sound deadening layer is reduced due to the shrinkage of the sound deadening layer, the deformation due to uneven packing density, etc. is prevented, the sound deadening performance is prevented from being lowered, and the heat resistance is reduced. Can be improved.
As the above-mentioned “sound-reducing material” on which the sound deadening structure of the present invention is formed, any material for which a sound deadening effect is desired can be used. In particular, in the case of an exhaust pipe of an internal combustion engine used at a high temperature, it can be used particularly advantageously because it can exhibit good silencing, heat insulation and heat resistance.

Examples of the “internal combustion engine” include engines such as vehicles, airplanes and ships, and generators such as power plants. Examples of the vehicle include automobiles, motorcycles, heavy construction machines, snowmobiles, weeders, and cleaners. Examples of the power plant include thermal power, hydraulic power, and nuclear power plant. The “exhaust pipe” is not particularly limited as long as it is connected to the internal combustion engine and allows exhaust gas to pass therethrough. The exhaust pipe can be, for example, a pipe having a through hole for a sound deadening function on a peripheral surface. Examples of the exhaust pipe include a main muffler and a pre-muffler (also referred to as a chamber). Further, the exhaust pipe may be an exhaust pipe in which a through hole for a silencing function is not formed on the peripheral surface, for example. Examples of such an exhaust pipe include an exhaust manifold, a front pipe, a rear pipe, and the like. For example, the silencer structure of the present invention can be installed on the manifold and the surrounding high-temperature part to form a heat-resistant heat insulating layer. The exhaust pipe is usually made of stainless steel.
As the “sound silenced material” in which the sound deadening structure of the present invention is used, a vehicle pre-muffler or a main muffler is particularly preferable.

[2] Silencer Manufacturing Method and Silencer The silencer manufacturing method of the present invention is as follows: [1] A bundled fiber made of a plurality of glass fibers from one end side of the cladding tube into the cladding tube is defibrated into a bulky shape. The defibrated fiber bundle obtained and <2> a granular material treated with an inorganic binder, <3> an inorganic binder and a granular material, or <4> a low-melting glass inorganic binder (hereinafter, < 2 > to <4 > Is collectively referred to as “inorganic binder, etc.”) [2] By bundling a bundled fiber consisting of a plurality of glass fibers from one end side of the cladding tube into the cladding tube. By supplying the defibrated fiber bundle and inorganic binder, and sucking the gas in the cladding tube from the other end side of the cladding tube, or [3] A plurality of fibers from one end side of the cladding tube into the cladding tube Consist of glass fibers Blowing the fiber bundle and inorganic binder obtained by defibrating the fiber into a bulky shape, and sucking the gas in the cladding tube from the other end side of the cladding tube, The inorganic binder or the like is filled in the cladding tube.
The material and shape of the cladding tube are not particularly limited, and various materials and shapes of cladding tubes can be used as necessary. For example, the material is made of stainless steel, and examples of the shape include a cylindrical shape, a rectangular tube shape, and a tapered tube shape. Furthermore, the axial direction end side of the said cladding tube can be a taper surface shape, or a flat plate surface shape, for example.

  In the method for producing a sound deadening structure according to the present invention, the clad tube is filled with a fibrillated fiber bundle, an inorganic binder, and the like by any one of the methods [1] to [3]. In the method of [1], the disentanglement fiber, the inorganic binder, and the like are filled into the cladding tube by blowing the disentanglement fiber, the inorganic binder, and the like from the one end side of the cladding tube into the cladding tube. . The blowing method and means are not particularly limited, and the blowing is usually performed with compressed gas (compressed air or the like).

  Further, in the method for producing a silencer structure of the present invention, as shown in the above [2], a bundled fiber made of a plurality of glass fibers is defibrated into a bulky shape from one end side of the cladding tube into the cladding tube. The defibrated fiber bundle and the like can be filled into the cladding tube by supplying the defibrated fiber bundle and the inorganic binder obtained and sucking the gas in the cladding tube from the other end side of the cladding tube. . In the method [2], there is no particular limitation on the method of supplying the defibrated fiber bundle and the inorganic binder from the one end side of the cladding tube into the cladding tube. That is, as long as it can be supplied, it is not necessarily supplied by blowing.

The suction method is not particularly limited as long as the air in the cladding tube can be removed by suction, and is usually performed by applying vacuum from the outside of the cladding tube. As a method of “suctioning the gas in the cladding tube from the other end side of the cladding tube”, as long as the gas (air etc.) in the cladding tube can be suctioned and removed from the “other end side of the cladding tube” There is no particular limitation. For example, a vacuum may be installed on the other end side of the cladding tube, and air in the cladding tube may be sucked and removed from the other end side of the cladding tube, and as shown in FIGS. 4 and 5, With respect to the cladding tube having a hollow pipe-like sound deadening material having a through hole in the peripheral surface, the gas in the cladding tube is sucked and removed through the through hole from the other end side of the sound deadening material by vacuum or the like. Cases are also included.
The suction conditions are not particularly limited as long as the gas in the cladding tube can be sucked and removed, and various conditions may be used as necessary.

  Furthermore, in the method for producing a muffler structure of the present invention, as shown in [3] above, gas is blown into the cladding tube from one end side of the cladding tube, and the other end side of the cladding tube is inserted into the cladding tube. The defibrated fiber bundle or the like may be filled in the cladding tube by sucking the gas. In this way, while blowing with gas (compressed air or the like) from one end side of the cladding tube, the air flow is reduced by sucking the gas in the cladding tube from the other end side of the cladding tube. It can be made regular from the one end side of the cladding tube to the other end side. As a result, the defibrated fiber bundle can be filled into the cladding tube smoothly, and the defibrated fiber bundle can be filled into the cladding tube with higher density and uniformity. In this case, the gas blowing method / condition and the suction method / condition are as described above.

  In the silencer manufacturing method of the present invention, a defibrated fiber bundle obtained by defusing a bundled fiber made of a plurality of glass fibers into a bulky shape by any one of the methods [1] to [3] above. When filling the coated tube, the bundled fibers are defibrated in a bulky form in advance to obtain a defibrated fiber bundle, and the defibrated fiber bundle is then coated by the method according to any one of [1] to [3]. The tube may be filled, or the coated tube may be filled simultaneously with defibration by performing any one of the above methods [1] to [3] using a bundled fiber.

  Further, the filling method is not particularly limited as long as the defibrated fiber bundle can be filled. For example, simply performing the method in any one of [1] to [3] above, and supplying the defibrated fiber bundle and the inorganic binder continuously from the nozzle, the defibrated fiber bundle and the inorganic binder are randomly Alternatively, the defibrated fiber bundle is supplied and filled in a spiral shape by rotating a nozzle or a coating tube that supplies the defibrated fiber bundle. This method is preferable because the defibrated fiber bundle can be filled in the cladding tube at a higher density and more uniformly.

  In the silencer manufacturing method of the present invention, the cladding tube is filled with the inorganic binder and the like together with the defibrated fiber bundle. Thereby, as described above, it is possible to prevent a decrease in the volume of the sound deadening layer, to obtain a silencer that is less deformed and excellent in sound deadening performance. The inorganic binder or the like is usually supplied at the same time as the defibrated fiber bundle, but there are no particular limitations on conditions such as the order of supply. For example, the defibrated fiber bundle and the inorganic binder may be supplied into the nozzle and simultaneously blown into the cladding tube, or may be blown into the cladding tube from separate nozzles. In addition, the above-mentioned thing can be used for the kind of the said inorganic binder, a granular material, and low melting glass.

  In the method for producing a silencer of the present invention, after the defibrated fiber bundle and the powder treated with the inorganic binder, or the inorganic binder and the granular material are filled in the cladding tube, the defibrated fiber bundles or the above A sound deadening layer is formed by adhering the defibrated fiber bundle and the granular material. There is no particular limitation on the method of fixing, and various conditions can be set according to the conditions such as the type of the inorganic binder used. For example, heat treatment may be performed after filling, or heat curing may be performed using the heat of engine exhaust gas. Thereby, it is possible to suppress the volume of the sound deadening layer from being reduced or changed, and it is possible to obtain a silencer with less deformation.

  In the silencer manufacturing method of the present invention, when the low melting point glass is blown together with the defibrated fiber bundle, the defibrated fiber bundle is filled after the defibrated fiber bundle is filled in the cladding tube. The cladding tube is heated. Thereby, the low melting point glass dispersed in the defibrated fiber bundle can be softened, and the single fibers constituting the defibrated fiber bundle can be fixed to each other at the contact point to form a sound deadening layer. As a result, it is possible to obtain a silencer that is less likely to lose the shape of the sound deadening layer and has excellent sound deadening performance. The heating conditions and method are not particularly limited as long as the low-melting glass dispersed in the defibrated fiber bundle is softened and the single fibers constituting the defibrated fiber bundle can be fixed to each other with a contact point. For example, heat treatment may be performed after filling, or heat curing may be performed using the heat of engine exhaust gas.

  In the method for manufacturing a silencer of the present invention, the density of the silencer layer is not particularly limited, and can be set in various ranges as necessary. Usually, the sound deadening layer has a bulk specific gravity of 0.05 to 2.50, preferably 0.05 to 2.0, more preferably 0.1 to 1.8, and more preferably 0.1 to 1.5. It is. By setting the density within the above range, it is preferable because strength can be maintained and heat resistance and heat insulation can be improved.

  In the method for producing a sound deadening structure of the present invention, the outer peripheral surface of the sound deadening layer can be further impregnated or coated with an inorganic binder. Thereby, the heat resistance and heat insulation of a sound deadening structure can be improved further. This is presumed to be due to the formation of an outer peripheral coating layer on the outer peripheral surface of the sound deadening layer by impregnating or coating the outer peripheral surface of the sound deadening layer with an inorganic binder. There is no intention to limit. The kind of the inorganic binder is not particularly limited, and normally, as already described in detail, the inorganic binder capable of fixing the contact between the single fibers constituting the defibrated fiber bundle can be used.

The silencer of the present invention includes the silencer structure of the present invention. Thereby, it is possible to suppress the volume of the sound deadening layer from being reduced or changed, and there is an effect that there is little loss of shape and excellent sound deadening effect and heat resistance.
As long as the silencer of the present invention includes the above-described silencer structure of the present invention, the other configurations are not particularly limited. For example, when the silencing structure is an exhaust pipe of an internal combustion engine, for example, a structure including a cladding tube that further covers the outer peripheral side of the silencing structure according to the present invention can be employed. As a method of obtaining a silencer having such a structure, as shown in FIG. 3, the wound defibrated fiber bundle portion of the silencer structure of the present invention is usually accommodated in a cladding tube. It is formed by housing the sound deadening structure of the present invention and then closing both ends of the cladding tube. There is no particular limitation on the material and shape of the cladding tube. For example, the material is made of stainless steel, and examples of the shape include a cylindrical shape, a rectangular tube shape, and a tapered tube shape. Furthermore, the axial direction end side of the said cladding tube can be a taper surface shape, or a flat plate surface shape, for example. In addition, when applying a silencing structure to an exhaust manifold, this cladding tube is not usually provided.

  Examples of the “internal combustion engine” include engines such as vehicles, airplanes and ships, and generators such as power plants. Examples of the vehicle include an automobile, a two-wheeled vehicle, a heavy construction machine, a snowmobile, a weeder, and a cleaner. Examples of the power plant include thermal power, hydraulic power, and nuclear power plant. The “exhaust pipe” is not particularly limited as long as it is connected to the internal combustion engine and allows exhaust gas to pass therethrough. The exhaust pipe can be, for example, a pipe having a through hole for a sound deadening function on a peripheral surface. Examples of the exhaust pipe include a main muffler and a pre-muffler (also referred to as a chamber). Further, the exhaust pipe may be an exhaust pipe in which a through hole for a silencing function is not formed on the peripheral surface, for example. Examples of such an exhaust pipe include an exhaust manifold, a front pipe, a rear pipe, and the like. The exhaust pipe is usually made of stainless steel.

  Another silencer of the present invention is obtained by the silencer manufacturing method of the present invention. As with the silencer of the present invention, the other silencer of the present invention can also suppress the volume of the silencer layer from being reduced or changed, and is excellent in the silencing effect with little deformation, and excellent in heat resistance. There is an operational effect.

Hereinafter, the present invention will be described in detail with reference to the drawings and the like.
(1) Reference Example This example relates to a silencer structure in which a defibrated fiber bundle is fixed with an inorganic binder, a method of manufacturing the silencer, and the silencer structure and silencer.
In this embodiment, the bundled fiber is supplied into the nozzle and compressed air is blown into the nozzle. At the same time, an inorganic binder (silica-containing inorganic binder; “NK-bond GF” manufactured by Sankyo Pharmaceutical Co., Ltd.) is applied by a spray coating device. by blowing -10 "), at the same time the density of the fiber bundles are defibrated the focused fiber single fiber such that 300 kg / m ^3, the inorganic binder is applied to the defibrated fiber bundle, A defibrated fiber bundle containing an inorganic binder was obtained. In this example, 35% by weight of an inorganic binder was used with respect to 100% by weight of the defibrated fiber bundle.

Next, as shown in FIG. 1, the defibrated fiber bundle 2 containing the inorganic binder is traversed or the like while rotating the inner pipe 3, which is a material to be silenced, with an appropriate rotating means around its axis. By reciprocating in the axial direction of the inner pipe 3, the defibrated fiber bundle 2 containing the inorganic binder was wound around the outer peripheral surface of the inner pipe 3 to form a sound deadening layer. Thereby, as shown in FIG. 2, the sound deadening structure 1 in which the sound deadening layer 4 is formed on the outer periphery of the inner pipe 3 was manufactured. Thereafter, the silencer structure 1 was inserted into the cladding tube 5, and then the opening of the cladding tube 5 was closed, thereby producing a silencer 6 including the silencer structure 1 of the present invention as shown in FIG. The cladding tube 5 is made of stainless steel, and the sound deadening layer 4 formed by the defibrated fiber bundle has a thickness of 20 mm. After the production, the whole was treated at 200 ° C. for 30 minutes to cure the inorganic binder. In this reference example, the heat treatment is performed after the manufacture in order to cure the inorganic binder. However, the heat treatment can be performed by utilizing the heat of the exhaust gas of the engine.

(2) Example 1
In this embodiment, the defibrated fiber bundle and the inorganic binder are blown from one end side of the cladding tube, and the air in the cladding tube is sucked and removed from the other end side of the cladding tube, whereby the defibrated fiber bundle It is related with the manufacturing method of the silencer which fills up.
In this embodiment, as shown in FIG. 4, the bundled fiber is supplied into the nozzle, and compressed air is blown into the nozzle. At the same time, an inorganic binder (silica-containing inorganic binder; Sankyo Pharmaceutical Co., Ltd.) is sprayed by a spray coating device. by blowing company made "NK- bond GF-10"), at the same time the density of the fiber bundles and defibrated fiber bundle 2 by fibrillating focusing fibers 2 'in the form of single fibers so that 300 kg / m ³ Then, the defibrated fiber bundle 2 and the inorganic binder were blown from the nozzle to the one end side of the cladding tube 5. In this example, 35% by weight of an inorganic binder was used with respect to 100% by weight of the defibrated fiber bundle.

The stainless steel cladding tube 5 used in the first embodiment has an inner pipe 3 as a hollow pipe-like sound deadening material having a through hole on the peripheral surface. The other end side of the inner pipe 3 penetrates through an end plate provided on the other end side of the cladding tube 5 and is exposed to the outside. And as shown in FIG.4 and FIG.5, the said defibrated fiber bundle 2 was supplied from the one end part side of the cladding tube 5 by the said blowing. At the same time, a known vacuum (not shown) was used from the other end side of the inner pipe 3 and the air in the cladding tube 5 was removed by suction through a through-hole on the peripheral surface. The arrows in FIGS. 4 and 5 indicate the flow of air. By blowing from one end side of the cladding tube 5 and suctioning from the other end side, the air flow is indicated by the arrow. The flow is almost constant as in the direction. After the defibrated fiber bundle and the inorganic binder were filled in the cladding tube 5 by this method, an end plate was attached to one end portion side of the cladding tube 5, thereby producing a sound deadening structure of Example 1 . After the production, the inorganic binder in the defibrated fiber bundle was cured by treating the whole at 200 ° C. for 30 minutes. In this embodiment, too, the heat treatment is performed after the manufacture in order to cure the inorganic binder. However, the heat can be cured by using the heat of the exhaust gas of the engine.

(3) Example 2
The following experiment was conducted in order to confirm the heat resistance and sound absorption of the defibrated fiber bundle constituting the silencer structure and silencer of the present invention by impregnation and solidification with an inorganic binder.
(A) Sound absorption test Glass fiber heat insulating plate (density: 12 kg / m ³ ) processed using short fibers (fiber diameter 9 μm) of glass fibers (JIS R-3413) as a defibrated fiber bundle. It was used. The glass fiber heat insulating plate was impregnated with an aluminosilicate inorganic binder (“GF Bond S-250” manufactured by Sankyo Pharmaceutical Co., Ltd.) and solidified (inorganic binder adhesion rate [weight of the above-mentioned glass fiber heat insulating plate of the solidified inorganic binder) 70%). And the sound absorption coefficient (%) was measured by the sound transmission loss method (back air layer; 0 mm, frequency; 125-4000 C / S) using the said glass fiber heat insulating board after solidification. In addition, the same applies to a 50 mm thick glass fiber heat insulating plate (density: 48 kg / m ³ , untreated with inorganic binder) processed using short fibers (fiber diameter 9 μm) of glass fibers (JIS R-3413). The sound absorption coefficient (%) was measured. The results are shown in Table 1 below and FIG. In Table 1, “No. 1” is an inorganic binder-untreated glass fiber heat insulating plate (density: 12 kg / m ³ ), and “No. 2” is an inorganic binder untreated glass fiber heat insulating plate (density; 48 kg / ^{m 3)} and is, "No.3" is fiberglass insulation board inorganic binder treated (density; is 12kg / ^{m 3).}

  From Table 1 and FIG. No. 3 is No. of inorganic binder untreated. No. 1 having a sound absorption rate superior to that of No. 1 and substantially four times the density. It can be seen that the sound absorption coefficient is about the same as 2. Moreover, No. which performed the inorganic binder process. It can be seen that No. 3 shows good sound absorption characteristics particularly in the middle to high sound range of 500 C / S or more with a short wavelength. In general, the sound insulation property follows the law of mass, and as the weight of the material increases, the sound insulation effect is greater. It is thought to have improved. This is a guess, and there is no intention to limit the scope of the present invention.

(B) Heat resistance test 1
As a defibrated fiber bundle, a short fiber (fiber diameter 9 μm) of glass fiber (JIS R-3413) and “RO99 5134” (manufactured by SAINT-GOBAIN / VETROTEX, fiber diameter 23 μm) are used to form a mat having a thickness of 5 mm. Samples that were processed and cut to 50 × 50 mm were used. The sample is impregnated with an aluminosilicate inorganic binder (“GF Bond S-800” manufactured by Sankyo Pharmaceutical Co., Ltd.) and dried at 200 ° C. for 5 hours so that the inorganic binder adhesion rate is 30, 70 and 200%. Solidified. And the said sample after solidification was each heated at 600-1000 degreeC for 4 hours with the electric furnace, and the shrinkage | contraction rate (%) of the vertical / horizontal direction was measured. The results are shown in Table 2 below, FIG. 7 and FIG.

From Table 2, FIG. 7 and FIG. 8, the sample not treated with the inorganic binder started to harden at around 700 ° C., began to shrink at 750 ° C., further cured at 800 ° C., and melted to vitrify at 850 ° C. . In contrast, in the inorganic binder-treated sample, the dimensional stability increases in proportion to the amount of inorganic binder attached, and when the amount of attachment reaches 100 to 200%, the non-shrinkable state is maintained even at 1000 ° C. It can be seen that shrinkage can be prevented.
As mentioned above, it turns out that heat resistance can be improved by performing an inorganic binder process. Presuming this reason, the heat-resistant inorganic binder wraps the glass fiber, fixes the contact point of the single fiber, suppresses shrinkage, and changes in composition to a high melting point composition. This is thought to be due to the fact that the shrinkage due to melting is suppressed. This is a guess, and there is no intention to limit the scope of the present invention.

(C) Heat resistance test 2
As the defibrated fiber bundle, a sample processed into a mat shape having a thickness of 3 mm and 5 mm using short fibers (fiber diameter 9 μm) of glass fiber (JIS R-3413) was used. The sample was impregnated with an aluminosilicate inorganic binder (“GF bond S-800”) and solidified (inorganic binder adhesion rate: 120%). The sample after solidification was heated with a burner (1500 ° C.). 9 to 11. The results are shown in Fig. 9 to Fig. 11. Fig. 9 is a sample before solidification and heating with an inorganic binder, and Fig. 10 is the result of using a sample having a thickness of 3 mm. (Left side: inorganic binder untreated, right side: inorganic binder treatment), FIG. 11 shows the results of using a 5 mm thick sample (left side: inorganic binder untreated, right side: inorganic binder treatment).

  As a result of the above test, all the samples not treated with the inorganic binder melted within 5 seconds and opened holes (left side in FIG. 10 and left side in FIG. 11), whereas the samples treated with the inorganic binder Since the sample did not melt or shrink even when heated for 3 minutes (right side of FIG. 10 and right side of FIG. 11), it can be seen that heat resistance is improved by solidification with an inorganic binder.

  The present invention is not limited to the specific examples described above, and various modifications can be made within the scope of the present invention depending on the purpose and application.

  According to the silencing structure and the manufacturing method thereof and the silencer and the manufacturing method thereof according to the present invention, the volume of the silencing layer is reduced due to the contraction of the silencing layer, the deformation due to uneven packing density, etc. is prevented, and the silencing performance is improved. A decrease can be prevented. The silencing structure and the silencing device of the present invention can be widely used for exhaust pipes of internal combustion engines, in particular, a pre-muffler or a main muffler.

It is explanatory drawing which shows the winding process to the inner pipe 3 in a reference example. It is a side view of the sound deadening structure obtained in the reference example. It is a longitudinal cross-sectional view of the cladding tube 5 and the silencing layer 4 of the silencing structure obtained in the reference example. It is explanatory drawing which shows the filling process in the sheath tube 5 of the fibrillation of the bundling fiber 2 'in this Example 1, and the defibrated fiber bundle 2. FIG. It is explanatory drawing which shows the filling process in the cladding tube 5 of the defibrated fiber bundle 2 in the present Example 1. FIG. It is the graph which plotted the result in the sound-absorbing property test of the present Example 2 . It is the graph which plotted the shrinkage rate (%) of the sample using the short fiber of the glass fiber (JIS R-3413) in the heat resistance test 1 of the present Example 2 . It is the graph which plotted the shrinkage | contraction rate (%) of the sample using "NSGV 5134" in the heat resistance test 1 of the present Example 2 . It is the figure which copied the photograph which image | photographed the sample before solidifying and heating with the inorganic binder in the heat resistance test 2 of the present Example 2. FIG. It is a result using the sample of thickness 3mm in the heat resistance test 2 of the present Example 2 (left side: untreated inorganic binder, right side: treated with inorganic binder). It is a result using the sample of thickness 5mm in the heat resistance test 2 of the present Example 2 (left side: untreated inorganic binder, right side: treated with inorganic binder).

DESCRIPTION OF SYMBOLS 1; Silencer structure, 2; Disentanglement fiber bundle, 2 '; Converging fiber, 3; Inner pipe, 4; Silencer layer, 5;

Claims (17)

  A bundle of fibers made of a plurality of glass fibers is defibrated into a bulky shape, and a pulverized fiber bundle containing the granular material treated with the inorganic binder is obtained by adding the granular material treated with the inorganic binder. Next, the method for producing a sound deadening structure is characterized in that the defibrated fiber bundle is wound around a sound deadening material, and then the inorganic binder contained in the defibrated fiber bundle is cured.   A bundle of fibers composed of a plurality of glass fibers is defibrated into a bulky shape, and an inorganic binder and a granular material are added sequentially or simultaneously to obtain a defibrated fiber bundle containing the inorganic binder and the granular material. Subsequently, the method for producing a sound deadening structure is characterized in that the defibrated fiber bundle is wound around a sound deadening material, and then the inorganic binder contained in the defibrated fiber bundle is cured. The method for producing a sound deadening structure according to claim 1 or 2 , wherein the inorganic binder contains silica and / or aluminosilicate. The method for producing a muffler structure according to any one of claims 1 to 3 , wherein a density of the defibrated fiber bundle obtained by curing the inorganic binder is 0.05 to 2.50 in terms of bulk specific gravity. The method for producing a silencing structure according to any one of claims 1 to 4 , wherein an outer peripheral surface of the defibrated fiber bundle obtained by curing the inorganic binder is further impregnated or coated with an inorganic binder.   The fiber bundles made of a plurality of glass fibers are defibrated into a bulky shape, and a low melting glass having a softening temperature of 1000 ° C. or lower is added to obtain a defibrated fiber bundle containing the low melting glass, Winding the defibrated fiber bundle around the sound-dissipating material, and then heating the sound-dissipating material wound with the defibrated fiber bundle to soften the low-melting glass and fix the defibrated fiber bundle. A method for producing a silencing structure characterized by the above. The method for producing a muffler structure according to claim 6 , wherein the density of the defibrated fiber bundle adhered is 0.05 to 2.50 in bulk specific gravity. The method for producing a muffler structure according to claim 6 or 7, wherein an inorganic binder is further impregnated or coated on the outer peripheral surface of the fixed defibrated fiber bundle. The method for producing a muffler structure according to any one of claims 1 to 8 , wherein the adding means is spray addition or roll coating. A muffler structure obtained by the method for producing a muffler structure according to any one of claims 1 to 9 .   [1] Blowing a defibrated fiber bundle obtained by defusing a bundled fiber made of a plurality of glass fibers into a cladding tube from one end side of the cladding tube into a bulky tube and a granular material treated with an inorganic binder [2] A granular material treated with a defibrated fiber bundle and an inorganic binder obtained by defusing a bundled fiber consisting of a plurality of glass fibers into a cladding tube from one end side of the cladding tube into a bulky shape. While feeding, the gas in the cladding tube is sucked from the other end side of the cladding tube, or [3] The converging fibers made of a plurality of glass fibers into the cladding tube from the one end side of the cladding tube into a bulky shape While blowing the defibrated fiber bundle obtained by defibration and the granular material treated with the inorganic binder, by sucking the gas in the cladding tube from the other end side of the cladding tube, The above Silencer characterized by forming a silencing layer in the cladding tube by filling the coated tube with powder particles and then curing the inorganic binder contained in the defibrated fiber bundle Manufacturing method.   [1] By blowing a defibrated fiber bundle, an inorganic binder and a granular material obtained by defusing a bundled fiber composed of a plurality of glass fibers into a cladding tube from one end side of the cladding tube into a bulky shape, [2] While supplying a defibrated fiber bundle, an inorganic binder and a granular material obtained by defusing a bundled fiber made of a plurality of glass fibers into a cladding tube from one end side of the cladding tube into a bulky shape, By sucking the gas in the cladding tube from the other end side of the cladding tube, or [3] defusing the converging fiber made of a plurality of glass fibers into the cladding tube from the one end side of the cladding tube into a bulky shape The defibrated fiber bundle, the inorganic binder, and the powder are blown in and the gas in the cladding tube is sucked from the other end side of the cladding tube, thereby blowing the defibrated fiber bundle, the inorganic binder, and the powder. Granule The cladding tube was filled, then the by curing the inorganic binder contained in the defibrated fiber bundle production method of the muffler and forming a muffling layer on the cladding tube.   [1] A defibrated fiber bundle obtained by defusing a bundled fiber made of a plurality of glass fibers into a cladding tube from one end side of the cladding tube into a bulky shape and a low melting point glass having a softening temperature of 1000 ° C. or less. When blown, [2] a defibrated fiber bundle obtained by defusing a bundled fiber consisting of a plurality of glass fibers into a cladding tube from one end side of the cladding tube into a bulky shape and a softening temperature of 1000 ° C. or less Supplying low-melting glass and sucking the gas in the cladding tube from the other end side of the cladding tube, or [3] Converging fiber composed of a plurality of glass fibers from one end side of the cladding tube to the cladding tube By blowing a defibrated fiber bundle obtained by defibrating into a bulky shape and a low melting point glass having a softening temperature of 1000 ° C. or less, and sucking the gas in the cladding tube from the other end side of the cladding tube, Fill the inside of the cladding tube with a low melting point glass with a melting fiber bundle and a softening temperature of 1000 ° C. or less, and then heat the cladding tube to soften the low melting point glass and fix the fiber bundle. Thus, a silencing layer is formed in the cladding tube. The method for producing a silencer according to any one of claims 11 to 13 , wherein the density of the sound deadening layer is 0.05-2.50 in terms of bulk specific gravity. The method for producing a silencer according to any one of claims 11 to 14 , wherein an outer peripheral coating layer is formed by further impregnating or coating an outer peripheral surface of the silencing layer with an inorganic binder. A silencer comprising the silencer structure according to claim 10 . A muffler obtained by the method for producing a muffler according to any one of claims 11 to 15 .