JP6228571B2 - Sound-absorbing building material and manufacturing method thereof - Google Patents

Description

  The present invention relates to a sound-absorbing building material and a method for producing the same.

  As this type of sound-absorbing building material, conventionally, for example, those shown in Patent Document 1 and Patent Document 2 are known in order to obtain a decorative board in which sound-absorbing holes are not conspicuous. The sound-absorbing building material shown in Patent Document 1 has a large-diameter hole on the back surface of the substrate made of MDF, particle board, gypsum plate, calcium silicate plate, etc., and a small-diameter hole communicating with the large-diameter hole on the surface of the substrate. A resin film having a pinhole is laminated on the surface of the substrate, and the pinhole communicates with the large-diameter hole through the small-diameter hole of the substrate. The hole diameter of this pinhole is about 1 mm, and 1 mm or less is recommended.

  Patent Document 2 proposes that a nonwoven fabric made of glass fiber having air permeability is laminated on at least one of the front and back surfaces of a rock wool plate.

JP 2013-11156 A Japanese Patent Laid-Open No. Hei 6-297643

  However, in the thing of the said patent document 1, when the rock-wool board which has a sound absorptivity is used as a board | substrate, the sound absorption rate is only about 0.6 in NRC (Noise Reduction Coefficient). Can't get.

  Moreover, in the thing of patent document 2, it is inevitable that sound absorption performance is inhibited by the nonwoven fabric laminated | stacked on the surface of the rock wool board. Therefore, for example, it has been difficult to obtain a sound absorption property of about 0.7 with a sound absorption coefficient NRC.

  The present invention has been made in view of such various points, and the object thereof is to improve the structure of the sound-absorbing building material so that, for example, the sound absorption coefficient NRC is 0.7 or more even if a nonwoven fabric is laminated on the surface of the base material. This is to obtain a high sound absorption performance.

  In order to achieve the above object, in the present invention, the hole diameter of the pin hole formed on the surface of the rock wool plate is made larger than the usual 1 mm, and a non-woven sheet is laminated on the surface. .

Specifically, in the sound-absorbing building material of the first invention, a large number of bottomed pin holes having a hole diameter of 2.0 to 3.0 mm are formed at a constant pitch on the surface of a base material made of rock wool. A sheet made of non-woven fabric is laminated on the surface of the material, and a coating film for concealing the pin holes is formed on the surface of the sheet by painting with a breathable paint, and this breathable paint has a larger amount than the resin. It is characterized by having air permeability due to a gap formed between the pigments . The pin hole is formed, for example, by piercing a pin into the surface of a base material to make a hole.

  In the first invention, since the hole diameters of a large number of pin holes formed on the surface of the base material made of rock wool are 2.0 to 3.0 mm and larger than the usual 1 mm, Despite the lamination of the nonwoven fabric sheets, a high sound absorption performance of 0.7 or more can be obtained with a sound absorption coefficient NRC. Moreover, since the nonwoven fabric sheet is laminated | stacked on the base-material surface, while being able to obtain the design which cannot see a pin hole, the intensity | strength of a sound-absorbing building material can be made high.

In addition, since the coating film is formed on the surface of the non-woven sheet by applying a breathable paint, even if only the sheet is used, even if the pin hole of the base material is visible from the outside through the sheet, the pin The holes are surely concealed by the effect of concealing the coating film by the breathable paint, and the design can be improved without the pin holes being visible from the outside. In addition, since the paint forming the coating film contains a larger amount of pigment than the resin and has air permeability due to the gap formed between the pigments, the sound absorption performance is not greatly affected by the paint.

  If the hole diameter of each pin hole is less than 2.0 mm, sound absorption performance of NRC 0.7 or more cannot be obtained, while if it exceeds 3.0 mm, pin holes are formed on the surface of the base material by a large number of pins. Sometimes, when each pin comes out of the pin hole of the base material, cracks occur in the base material at the periphery of the pin hole.

  According to a second invention, in the first invention, the pitch of the plurality of pin holes is 5 to 10 mm.

  In the second aspect of the invention, the sound absorbing performance can be enhanced by forming a large number of large-diameter pin holes on the surface of the base material at a desired pitch. If this pitch is less than 5 mm, the space between the pin holes on the substrate surface becomes too narrow and cracks occur in the substrate, whereas if it exceeds 10 mm, the number of pin holes on the substrate surface decreases. Since the intended sound absorbing performance cannot be obtained, the thickness is set to 5 to 10 mm.

  A third invention is the sound absorbing building material according to the first or second invention, wherein a large number of pin holes are formed in a staggered arrangement.

  In the third invention, the sound absorbing performance can be enhanced by forming a large number of pin holes on the surface of the base material in a denser arrangement than the lattice arrangement.

The sound-absorbing building material of the fourth invention has a large number of bottomed pin holes having a hole diameter of 2.0 to 3.0 mm on the surface of the base material by pressing a large number of pins against the surface of the base material made of rock wool. Is formed at a constant pitch, and a sheet of non-woven fabric is laminated on the surface of the base material, and a coating film for concealing the pin holes is formed on the surface of the sheet by applying a breathable paint. The air-permeable coating material is characterized in that it contains a larger amount of pigment than the resin and has air permeability due to a gap formed between the pigments .

In this fourth invention, a large number of pins are pressed against the surface of the base material made of rock wool, and a large number of bottomed pin holes with a hole diameter of 2.0 to 3.0 mm are formed on the surface of the base material at a constant pitch. A sheet made of non-woven fabric is laminated on the surface of the base material to obtain a sound-absorbing building material. Also in this invention, the same effect as the first invention can be obtained .

According to a fifth aspect of the present invention, there is provided a method for producing a sound-absorbing building material, comprising pressing a pin of a pin hole processing device having a large number of pins projecting on a pressing surface against a surface of a base material made of rock wool. a number of bottomed pin hole of diameter 2.0~3.0mm the surface formed at a constant pitch, laminated sheet consisting of a nonwoven fabric on the surface of the substrate, the surface of the sheet, a resin A coating film for concealing the pin hole is formed on the surface of the sheet by coating with a breathable paint having a large amount of pigment and having a breathability due to gaps formed between the pigments. It is characterized by.

In this fifth invention, the pins of the pin hole machining apparatus are pressed against the surface of the base material, and a large number of bottomed pin holes with a hole diameter of 2.0 to 3.0 mm are formed on the surface of the base material at a constant pitch. Formed with. A sheet of non-woven fabric is laminated on the surface of this base material, and the surface of this sheet contains a larger amount of pigment than the resin and is coated with a breathable paint having a breathability due to gaps formed between the pigments. Te, coating for concealing pin holes Ru is formed. This makes it possible to easily obtain a sound-absorbing building material that is reinforced by a non-woven fabric, has high strength, conceals pin holes, has a good appearance, and has a high sound-absorbing performance with a sound absorption coefficient NRC of 0.7 or more.

As described above, according to the present invention, a large number of bottomed pin holes having a hole diameter of 2.0 to 3.0 mm are formed at a constant pitch on the surface of a base material made of rock wool, and a nonwoven fabric is formed on the surface of the base material. A coating of a sheet made of the above , and a coating film for concealing pin holes on the surface of the sheet is coated with a breathable paint having a larger amount of pigment than the resin and having a breathability due to a gap formed between the pigments. by forming by, while they nonwoven fabric laminated on the surface of the substrate, it is possible to obtain a sound absorbing building material having 0.7 or more higher sound absorption properties, for example, sound absorption coefficient NRC, a pin hole by insufflation paint The design of the sound-absorbing building material can be enhanced without hindering the sound-absorbing performance by reliably concealing the coating film by the concealing effect .

FIG. 1 is a perspective view showing a sound absorbing building material according to an embodiment of the present invention, partially broken away. FIG. 2 is an enlarged plan view showing the surface of the substrate. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a view corresponding to FIG. 2 showing a modification of the arrangement of pin holes. FIG. 5 is a diagram showing a manufacturing process of a method for manufacturing a sound-absorbing building material together with an apparatus. FIG. 6 is an enlarged front view showing a state where the pins of the pin hole processing apparatus are processing the pin holes on the surface of the base material. FIG. 7 is a diagram showing the results of Experiment 1. In FIG. FIG. 8 is a diagram showing the results of Experiment 2. In FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the embodiments is merely illustrative in nature and is not intended to limit the present invention, its application, or its use at all.

  FIG. 1 shows a sound-absorbing building material A according to an embodiment of the present invention. The sound-absorbing building material A is constructed, for example, as a sound-absorbing ceiling material on a ceiling portion of a building, or as a sound-absorbing wall material on a wall portion (particularly an upper portion). Needless to say, the sound-absorbing building material A may be applied to other parts of the building excluding the ceiling and walls.

  The sound-absorbing building material A has a plate-like base material 1. The base material 1 is preferably a relatively light base material in order to obtain high sound absorption, and is made of, for example, a rock wool plate having a specific gravity of about 0.19 to 0.26, and the thickness t is particularly limited. You can choose from those that are commonly used.

  A number of bottomed pin holes 2, 2,... Are formed on the surface of the substrate 1 at a constant pitch p. This pin hole 2 is formed by piercing pins 14, 14,... (See FIG. 6) on the surface of the substrate 1, and this pin 14 is, for example, a pin hole processing device 12 as described later. It protrudes from the pressing surface (see FIG. 6). As shown in FIG. 2, the plurality of pin holes 2, 2,... Are formed in a lattice arrangement so as to be aligned in the vertical direction and the horizontal direction orthogonal to each other. In addition, as shown in FIG. 4, a large number of pin holes 2, 2,... Are arranged in rows along the vertical direction (or horizontal direction). Both pin holes 2 and 2 may be formed in a staggered arrangement so that they are not aligned along the horizontal direction (or vertical direction) but shifted in the vertical direction (or horizontal direction).

  As shown also in FIG. 3, each said pin hole 2 is a bottomed cylindrical thing, The hole diameter d shall be d = 2.0-3.0 mm. If the hole diameter d of each pin hole 2 is less than 2.0 mm, sound absorption performance of NRC 0.7 or more cannot be obtained, while if it exceeds 3.0 mm, as will be described later, When the pins 14 are pressed against the surface of the base material 1 to form the pin holes 2, cracks occur in the base material 1 at the periphery of the pin holes 2 when each pin 14 comes out of the pin hole 2 of the base material 1. 2.0 to 3.0 mm. NRC (Noise Reduction Coefficient) is an arithmetic average value of the sound absorption coefficient of each frequency.

  Further, the pitch p of the large number of pin holes 2, 2,. If the pitch p is less than 5 mm, the space between the pin holes 2 and 2 on the surface of the base material 1 becomes too narrow and the base material 1 is cracked. This is because the number of holes 2 is too small to achieve the intended sound absorption performance.

  Furthermore, the depth D of each pin hole 2 should just be the depth which does not penetrate to the back surface of the base material 1. FIG. For example, when the thickness t of the base material 1 is set to 9 to 25 mm, the depth D of the pin hole 2 is formed to be non-penetrating in accordance with the thickness of each base material 1.

  It is desirable that the opening ratio of such a large number of pin holes 2, 2,. When the aperture ratio of the pin holes 2, 2,... Is less than 3%, the number of pin holes 2 on the surface of the substrate 1 is too small to obtain the intended sound absorbing performance, but exceeds 40%. Then, since the number of pin holes 2 on the surface of the base material 1 increases and the pitch p of the pin holes 2 becomes too narrow, the base material 1 is cracked, so 3 to 40% is desirable.

On the surface of the base material 1, a non-woven fabric sheet 5 made of non-woven fabric is laminated and integrated by bonding from a number of pin holes 2, 2,. This nonwoven fabric sheet 5 consists of glass fiber nonwoven fabrics (glass nonwoven fabric) etc., for example, The weighed is about 70 g / m < ² >, for example. As an adhesive for adhering the nonwoven fabric sheet 5, any adhesive may be used as long as it can be generally used, such as vinyl acetate and acrylic.

In addition, a coating film 8 is formed on the surface of the non-woven fabric sheet 5 by applying a breathable paint. This breathable paint contains a large amount of pigment with respect to the resin, and a gap is formed between the pigments to provide breathability. As the breathable paint, for example, a paint having a composition having the following main components is used.
・ Resin (vinyl acetate, acrylic, PVA, etc.): 15 to 25% by weight
Pigment (inorganic powder such as calcium carbonate, titanium oxide, clay, porous inorganic powder such as pearlite): 75 to 85% by weight
Next, the manufacturing method of the said sound-absorbing building material A is demonstrated. FIG. 5 shows the steps of this manufacturing method together with the apparatus, and the manufacturing steps include a pin hole processing step, an adhesive application step, a nonwoven fabric sheet laminating step, a first drying step, a painting step, and a second drying step. . In FIG. 5, reference numeral 10 denotes a plurality of transport rollers installed along the transport direction of the base material 1, and the plurality of base materials 1, 1,... .. Are placed on the transport rollers 10, 10,... And sequentially transported from the left side to the right side in FIG.

  In the pin hole processing step, the pin hole processing device 12 forms a large number of pin holes 2, 2,. The pin hole processing device 12 has a processing flat plate 13 provided so as to be movable up and down with respect to the base material 1 on the transport rollers 10, 10,. As shown in FIG. 6, the lower surface of the processed flat plate 13 is a flat pressing surface, and a large number of cylindrical pins 14, 14,... Project from the pressing surface at a constant pitch p1. The arrangement of the pins 14, 14,... Is the same lattice arrangement (or zigzag arrangement) as the pin holes 2, 2,... Formed on the surface of the base material 1 of the sound absorbing building material A. The pitch p1 is the same as the pitch p of the pin holes 2, 2,. The outer diameter d1 of the pin 14 is substantially the same as the hole diameter d of the pin hole 2, and the protruding height h of the pin 14 is substantially the same as the depth D of the pin hole 2. Then, the processed flat plate 13 is moved downward with respect to each base material 1 made of rock wool placed on the conveying rollers 10, 10,..., And a large number of pins 14, 14,. A plurality of bottomed pin holes 2 having a hole diameter d of 2.0 to 3.0 mm on the entire surface of the substrate 1 by pressing the substrate 1 on the surface of the substrate 1 and repeating this several times while shifting the substrate 1 in the conveying direction. , 2,... Are formed at a constant pitch p.

  In the adhesive application step, the adhesive 17 is applied to the surface of the substrate 1 on which the pin holes 2 are formed by the adhesive application device 16. The adhesive application device 16 includes a receiving roll 18 having a conveying surface that is the same height as the conveying rollers 10, 10,... And a horizontal rotation axis, and is slightly above the thickness of the substrate 1 on the upper side of the receiving roll 18. An applicator roll 19 that is disposed at a large interval and has the same diameter as the receiving roll 18 and a horizontal rotation axis is provided. On the upper side of the coating roll 19, for example, an auxiliary roll 20 having a smaller diameter than the coating roll 19 and having a horizontal rotation axis is disposed. The outer circumferential surface of the auxiliary roll 20 and the outer circumferential surface of the coating roll 19 are not in contact with each other. An adhesive reservoir 21 for accommodating the adhesive 17 is formed between the two rolls 19 and 20 in contact therewith. Then, the base 1 is passed between the receiving roll 18 and the coating roll 19 while rotating the receiving roll 18 and the auxiliary roll 20 in the clockwise direction in the drawing and the coating roll 19 in the counterclockwise direction in the drawing. The adhesive 17 in the adhesive reservoir 21 is placed on the outer peripheral surface of the application roll 19 and applied to the surface of the base material 1.

  In the non-woven fabric sheet laminating step, the non-woven fabric sheet 5 is bonded to the surface of the base material 1 by the laminating apparatus 23 and laminated. The laminating device 23 includes a pressing roll 24 having a horizontal rotation axis disposed on the upper side of the conveying rollers 10, 10,... With a space slightly larger than the thickness of the base material 1. On the upper side of the pressing roll 24, a supply roll 25 around which the long nonwoven fabric sheet 5 is wound is disposed. The nonwoven fabric sheet 5 fed from the supply roll 25 is drawn to the pressing roll 24 and the pressing roll 24 and the substrate. The nonwoven fabric sheet 5 is sandwiched between one surface, the nonwoven fabric sheet 5 is pressed against the surface of the base material 1 by the pressing roll 24, and both are adhered by the adhesive 17 on the surface of the base material 1, and the nonwoven fabric sheet 5 is adhered to the surface of the base material 1. Is laminated and integrated. The non-woven fabric sheet 5 is bonded to the surface of the base material 1 and then cut into the size of the base material 1 by a cutting device (not shown).

  In the first drying step, the base material 1 having the nonwoven fabric sheet 5 laminated on the surface as described above is dried together with the nonwoven fabric sheet 5 by the dryer 27 to solidify the adhesive 17.

  In the painting process, the surface of the nonwoven fabric sheet 5 is coated by, for example, a spray-type coating device 29, and the coating device 29 sprays a breathable paint on the surface of the nonwoven fabric sheet 5 conveyed through the first drying step. Then, the surface of the sheet 5 is painted with a breathable paint.

  In the second drying step, the breathable paint applied to the surface of the nonwoven fabric sheet 5 as described above is dried by the dryer 27 and solidified.

  By passing through the above steps, a non-woven sheet 5 is laminated on the surface of the base material 1 having a number of bottomed pin holes 2, 2,... Formed at a constant pitch p on the surface. 5 is manufactured. Thereby, it is reinforced by the nonwoven fabric sheet 5 and has high strength, the pin holes 2, 2,... Are concealed by the coating film 8 and have a good appearance, and has a high sound absorption performance of 0.7 or more with a sound absorption coefficient NRC. The sound-absorbing building material A is easily obtained.

  That is, the sound absorbing building material A has a hole diameter d of 2. on the surface of the base material 1 by pressing a large number of pins 14, 14,... Of the pin hole processing device 12 against the surface of the base material 1 made of rock wool. A large number of bottomed pin holes 2, 2,... Of 0 to 3.0 mm are formed at a constant pitch p, and a nonwoven fabric sheet 5 made of a nonwoven fabric is laminated on the surface of the substrate 1.

  Therefore, in the said embodiment, many pin holes 2, 2, ... are formed in the surface of the base material 1 which consists of rock wool, and the hole diameter d of each pin hole 2 is 2.0-3.0 mm. Therefore, although the nonwoven fabric sheet 5 is laminated on the surface of the base material 1, a high sound absorption performance of 0.7 or more is obtained with a sound absorption coefficient NRC. Moreover, since the nonwoven fabric sheet 5 is laminated | stacked on the base material 1 surface, while the design which cannot see the pin hole 2 is obtained, the intensity | strength of the sound-absorbing building material A can be made high.

  Moreover, since the pitch p of many pin holes 2, 2, ... formed in the base material 1 surface is 5-10 mm, even if the pin hole 2 is 2.0-3.0 mm and a large diameter, the A large number of pin holes 2 having a large diameter can be formed on the surface of the base material 1 at a desired pitch to enhance sound absorption performance.

  Moreover, since the opening ratio of the pin holes 2, 2,... Relative to the surface of the base material 1 is 3 to 40%, a large number of large-diameter pin holes 2, 2,. Thus, the sound absorption performance can be improved.

  Further, when a large number of pin holes 2, 2,... Are formed in a lattice arrangement or a staggered arrangement, a large number of pin holes 2, 2,. be able to. In particular, in the staggered arrangement, the pin holes 2, 2,... Can be arranged by slightly reducing the distance only in the diagonal direction while keeping the pitch p of the adjacent pin holes 2, 2 as it is. There is an advantage that can be increased.

  Further, since the surface of the non-woven sheet 5 is coated with a breathable paint, even if the sheet 5 alone is used, even if the pin hole 2 of the base material 1 is visible from the outside through the sheet 5, the pin The hole 2 is reliably concealed by the concealing effect by the coating film 8 of the breathable paint, and the design can be enhanced without the pin hole 2 being visible from the outside. Further, since the paint has air permeability, the sound absorption performance is not greatly affected by the coating film 8.

  And by constructing the sound-absorbing building material A on the ceiling of the building to make a sound-absorbing ceiling material, or by constructing it on the wall of the building and making it a sound-absorbing wall material, it has a high sound-absorbing performance of 0.7 or more in terms of the sound absorption coefficient NRC. A sound absorbing ceiling material or a sound absorbing wall material can be easily obtained.

(Other embodiments)
In the above embodiment, the pin hole processing device 12 is a flat plate type having a processed flat plate 13 in which a large number of pins 14, 14,... You may use the pin hole processing roll by which the pin protruded with the fixed pitch, and it passes on the surface of the base material 1 by passing the base material 1 through a pin hole processing roll, rotating this pin hole processing roll. A large number of bottomed pin holes 2, 2,... Having a hole diameter d of 2.0 to 3.0 mm may be formed at a constant pitch p.

  Next, specific examples will be described.

(Experiment 1)
Using a base material composed of three types of rock wool with specific gravity of ρ = 0.260, ρ = 0.205, ρ = 0.188, a flat plate with a hole diameter of 1.6 mm on the surface of these base materials. The pin hole was processed, or two types of pin holes having a hole diameter of 1.6 mm and 1.2 mm were processed manually. Then, the nonwoven fabric sheet was adhere | attached on the surface of the base material in which the pin hole was formed, and also coating was given on the sheet | seat.

  And the base material itself in a state in which no pin hole is formed, the base material in which the pin hole is formed, the non-woven fabric sheet, and the coated one are set as Examples 1 to 10, and the sound absorption coefficient NRC is measured for each example. did. The result is shown in FIG. In the figure, a circle indicates that the corresponding part or the corresponding process has been performed. The rigid wall NRC is measured by placing a test specimen directly on the floor of the reverberation room, and is a sound absorption coefficient in a structure having no air layer on the back side. E400 NRC is measured from the surface of the test specimen on the floor. It is a sound absorption coefficient in a structure in which an air layer is provided on the back side so that the floor is 400 mm.

  When the result of FIG. 7 is seen, the comparison between Example 1 and Example 2 or Example 3, the comparison between Example 6 and Example 7, and the comparison between Example 8 and Example 9 reveals that the surface of the base material made of rock wool By forming a pin hole having a hole diameter of 1.6 mm or 1.2 mm, the sound absorption coefficient is higher than that of the base material itself. However, as shown in Example 4, Example 5 and Example 10, the sound absorption is achieved by laminating a non-woven sheet on the surface of the base material on which the pin hole having such a hole diameter is formed, and applying a coating thereon. It can be seen that the rate has declined.

(Experiment 2)
Unlike Experiment 1, a base material made of rock wool with a specific gravity of 0.19 was used, and a number of pin holes with a hole diameter of 2.0 mm and a depth of 18 mm were machined on the surface of this base material, After the non-woven fabric sheet was adhered to the surface, the surface of the non-woven fabric sheet was painted. This was used as the sample of Example 1. The area of the sample is 6.48 m ² .

Similarly, a large number of pin holes having a flat hole diameter of 2.4 mm and a depth of 17 mm were processed on the surface of a base material made of rock wool having the same specific gravity of 0.19, and a nonwoven fabric sheet was adhered thereon. Then, the surface of the nonwoven fabric sheet was painted. This was used as the sample of Example 2. The area of the sample is 6.48 m ² .

  For these examples, the sound absorption coefficient for each of 18 frequencies out of the frequency range of 100 to 5 KHz was measured, and NRC was obtained as an average value thereof. The result is as shown in FIG.

  From the result of FIG. 8, even if a non-woven sheet is laminated on the surface of the base material by forming pin holes with a hole diameter of 2.0 mm or more on the surface of the base material as in the present invention, the NRC Is 0.7 or more.

  INDUSTRIAL APPLICABILITY Since the present invention can obtain a sound-absorbing building material having a high sound-absorbing property with a sound absorption coefficient NRC of 0.7 or more while a nonwoven fabric is laminated on the surface of the base material, it is extremely useful and has industrial applicability. Is expensive.

A Sound absorbing building material 1 Base material t Thickness 2 Pin hole d Hole diameter p Pitch D Depth 5 Non-woven sheet 8 Coating film 12 Pin hole processing device 14 Pin d1 Outer diameter p1 Pitch h Projection height 16 Adhesive application device 23 Laminating device 29 Coating equipment

Claims (5)

A number of bottomed pin holes with a hole diameter of 2.0 to 3.0 mm are formed at a constant pitch on the surface of the base material made of rock wool,
A sheet of non-woven fabric is laminated on the surface of the base material ,
On the surface of the sheet, a coating film for concealing the pin hole is formed by applying a breathable paint,
The sound-absorbing building material , wherein the air-permeable paint contains a larger amount of pigment than the resin and has air permeability due to a gap formed between the pigments . In claim 1,
A sound-absorbing building material characterized in that the pitch of many pin holes is 5 to 10 mm. In claim 1 or 2,
A sound-absorbing building material in which a large number of pin holes are formed in a staggered arrangement. By pressing a large number of pins against the surface of a base material made of rock wool, a number of bottomed pin holes having a hole diameter of 2.0 to 3.0 mm are formed at a constant pitch on the surface of the base material. ,
A sheet of non-woven fabric is laminated on the surface of the base material ,
On the surface of the sheet, a coating film for concealing the pin hole is formed by applying a breathable paint,
The sound-absorbing building material , wherein the air-permeable paint contains a larger amount of pigment than the resin and has air permeability due to a gap formed between the pigments . By pressing a pin of a pin hole processing device in which a large number of pins protrude from the pressing surface at a constant pitch against the surface of the base material made of rock wool, a hole diameter of 2.0 to 3.0 mm is applied to the surface of the base material. A large number of bottomed pin holes are formed at a constant pitch,
Laminate a sheet of non-woven fabric on the surface of the base material by adhesion,
The pin hole is concealed on the surface of the sheet by coating the surface of the sheet with a breathable paint containing a larger amount of pigment than the resin and having a breathability due to a gap formed between the pigments. A method for producing a sound-absorbing building material, characterized in that a coating film is formed .

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