JP2018055048A - Sound insulation material and method for producing sound insulation material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound insulation material capable of exhibiting high sound insulation performance and a method for producing the sound insulation material. SOLUTION: A sound absorbing layer composed of a fiber or foam material, a sound insulating layer composed of a soft plastic, and a portion of one surface side of the sound absorbing layer enter one surface side of the sound insulating layer. A sound insulation material provided with a high sound insulation layer in a state of being welded to the surface, and a method for producing the sound insulation material. [Selection] Figure 2

Description

  The present invention relates to a sound insulating material for suppressing sound propagation and a method for manufacturing the sound insulating material.

  Conventionally, a sound insulating material provided with a sound absorbing layer for attenuating sound and a sound insulating layer for preventing sound transmission, and bonded with an adhesive in a state where the sound absorbing layer and the sound insulating layer are overlapped is provided. Has been.

  Such a sound insulating material is used in a state where the sound absorbing layer is installed facing the sound source side, and the sound transmitted to the outside is suppressed by blocking the sound attenuated by the sound absorbing layer with the sound insulating layer (for example, Patent Documents). 1).

JP 2007-291642 A

  By the way, although the sound insulation performance (performance which suppresses the propagation of sound) which a consumer demands for the sound insulation material tends to increase year by year, the sound insulation performance has a limit in the configuration of Patent Document 1, and there is room for improvement. Although it is conceivable to increase the sound insulation performance by increasing the thickness of the sound insulation layer, this is not a preferable improvement measure because it leads to an increase in production cost and an increase in size of the sound insulation material.

  Then, in view of such a situation, this invention makes it a subject to provide the sound insulation material which can exhibit high sound insulation performance, and the manufacturing method of this sound insulation material.

  The sound insulating material of the present invention includes a sound absorbing layer made of a fiber or foam material, a sound insulating layer made of a soft plastic, and a portion on one surface side of the sound absorbing layer has entered one surface side of the sound insulating layer. And a high sound insulation layer welded in a state.

  According to such a configuration, in the high sound insulation layer, since the portion on one surface side of the sound absorption layer is welded in a state of entering the one surface side of the sound insulation layer facing this, the specific gravity of the high sound insulation layer is the specific gravity of the sound insulation layer. Higher than. Therefore, since the sound insulating material can further block the sound by the high sound insulating layer that is less likely to transmit sound than the conventional sound insulating layer, the sound insulating performance (performance for suppressing sound propagation) is enhanced.

  In the sound insulating material of the present invention, the high sound insulating layer may have a thickness of 0.05 mm to 0.5 mm. According to such a configuration, peeling between the sound insulating layer and the sound absorbing layer can be prevented by setting the thickness to 0.05 mm or more, and it is also possible to prevent deformation from becoming difficult by setting the thickness to 0.5 mm or less.

  In the sound insulating material of the present invention, the sound absorbing layer may be made of a fiber-based material, and the high sound insulating layer may be a layer in which fibers of the sound absorbing layer enter one side of the sound insulating layer.

  According to such a configuration, the high sound insulation layer is a layer in which the fibers of the sound absorption layer enter one side of the sound insulation layer, and therefore has a higher specific gravity than the sound insulation layer. Therefore, since the sound insulating material can further block the sound by the high sound insulating layer that is less likely to transmit sound than the conventional sound insulating layer, the sound insulating performance is enhanced.

  The method for producing a sound insulating material of the present invention is such that one side of the sound insulating sheet made of soft plastic is melted, and one side of the sound absorbing sheet made of a fiber-based or foamed material is provided on one side of the sound insulating sheet. And by applying a compressive force to the sound insulating sheet and the sound absorbing sheet, a portion on the one surface side of the sound absorbing sheet is integrated into the one surface side of the sound insulating sheet, thereby integrating a high sound insulating layer. Form.

  According to such a configuration, the high sound insulation layer formed by integrating a part of the sound absorbing sheet on one surface side of the sound insulating sheet is higher than the specific gravity of the sound insulating sheet. Therefore, in the method for manufacturing the sound insulating material, a high sound insulating layer that transmits less sound than the sound insulating sheet can be formed, so that a sound insulating material with high sound insulating performance can be obtained.

  In the method for producing a sound insulating material of the present invention, the one surface side of the sound absorbing sheet may be overlapped with the one surface side of the sound insulating sheet melted by heat. Even in such a configuration, a sound insulation layer having a high sound insulation performance can be obtained because a high sound insulation layer can be formed by inserting and integrating a portion on one surface side of the sound absorption sheet on one surface side of the sound insulation sheet.

  As described above, according to the sound insulating material of the present invention, it is possible to achieve an excellent effect that high sound insulating performance can be exhibited without changing / adding the constituent materials. Moreover, according to the method for producing a sound insulating material of the present invention, it is possible to obtain an excellent effect that a sound insulating material having high sound insulating performance can be obtained without changing / adding constituent materials or adding complicated processes.

FIG. 1 is a cross-sectional view of a sound insulating material according to an embodiment of the present invention. FIG. 2 is an enlarged view of the sound insulating material according to the embodiment, and is an enlarged view of a region A in FIG. FIG. 3 is an explanatory diagram of the method for manufacturing the sound insulating material according to the embodiment.

  Hereinafter, a sound insulating material according to an embodiment of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the sound insulating material includes a sound absorbing layer 2 that attenuates sound, a sound insulating layer 3 that suppresses sound transmission, and a high sound insulating layer 4 formed by welding the sound absorbing layer 2 and the sound insulating layer 3. (See FIG. 2).

  The sound absorbing layer 2 is made of a fiber-based material, and in this embodiment, is made of felt (for example, flame-retardant miscellaneous cotton felt, PET felt, or the like).

  The thickness T1 of the sound absorbing layer 2 may be set between 3 mm and 15 mm. The thickness T1 of the sound absorbing layer 2 is preferably set to 5 mm to 10 mm, and is set to 7 mm in the present embodiment.

Specific gravity of the backing layer 2 ^may be within the range of ^{0.03g / cm 3 ~0.1g / cm 3} , in the present embodiment has a 0.07 g / cm ^3.

  The sound insulation layer 3 is made of soft plastic. As the soft plastic, for example, a material such as polyvinyl chloride or polyethylene (in this embodiment, polyvinyl chloride) may be used.

  The thickness T2 of the sound insulation layer 3 only needs to be set between 1 mm and 3 mm, and is set to 2 mm in the present embodiment.

Further, the specific gravity of the sound insulation layer 3 ^may be within the range of ^{1.4g / cm 3 ~3.5g / cm 3} , in the present embodiment has a 1.8 g / cm ^3.

  The high sound insulation layer 4 is a layer formed by thermally fusing the sound absorption layer 2 to the sound insulation layer 3. More specifically, as shown in FIG. 2, the high sound insulation layer 4 has a surface 3a side with respect to one surface 3a side of the sound insulation layer 3 (region from one surface 3a to the predetermined depth of the sound insulation layer 3). Is a layer in which a portion on the one surface 2a side (a part of a region from the one surface 2a to a predetermined depth) enters and is welded (integrated). Note that the portion of the sound absorbing layer 2 on the one surface 2a side is a portion that enters the one surface 3a side of the sound insulating layer 3.

In the present embodiment, since the sound absorbing layer 2 is made of felt that is a fiber-based material, the fiber 2b of the sound absorbing layer 2 (felt) enters and is welded to the one surface 3a side of the sound insulating layer 3. It has become. Furthermore, the fiber 2b of the sound absorbing layer 2 enters the one surface 3a side of the sound insulating layer 3 while maintaining the regularity.

  The thickness T3 of the high sound insulation layer 4 can be set between 0.05 mm and 0.5 mm, and is set to 0.25 mm in this embodiment. The thickness T3 of the high sound insulation layer 4 refers to the depth at which the one surface 2a side of the sound absorbing layer 2 enters the one surface 3a side of the sound insulation layer 3 with respect to the surface of the sound insulation layer 3.

The specific gravity of the high sound insulation layer 4 ^has only to be set within a range of ^{1.43g / cm 3 ~3.6g / cm 3} , in the present embodiment has a 1.87 g / cm ^3. When the specific gravity of the high sound insulation layer 4 is S, the specific gravity of the sound insulation layer 3 is S1, and the specific gravity of the sound absorption layer 2 is S2, the specific gravity S of the high sound insulation layer 4 is obtained by the following equation (1).

S = S1 + S2 (1)

In the present embodiment, as described above, since a part of the sound absorbing layer 2 enters the sound insulating layer 3 to form the high sound insulating layer 4 between the sound insulating layer 3 and the sound absorbing layer 2, the high sound insulating layer 4 The specific gravity is larger than the specific gravity of the sound insulation layer 3. That is, the high sound insulation layer 4 is less likely to transmit sound than the sound insulation layer 3.

  The configuration of the sound insulating material 1 according to the present embodiment is the above configuration. Then, the manufacturing method of the sound insulating material 1 is demonstrated.

  In the method for manufacturing the sound insulating material 1, as shown in FIG. 3, a sound absorbing sheet 20 made of a fiber material and a sound insulating sheet 30 made of a soft plastic are overlapped and welded.

  In the method for manufacturing the sound insulating material 1 according to the present embodiment, the sound insulating sheet 30 and the sound absorbing sheet 20 are sent out, and the entire sheet is heated and semi-dissolved (that is, a state where the sheet is softened to the extent that thermoplasticity is generated). The one surface 20a side of the sound absorbing sheet 20 is overlapped with the one surface 30a side of the sound insulating sheet 30, and the sound insulating sheet 30 and the sound absorbing sheet 20 are compressed (compressed in the direction in which the sound insulating sheet 30 and the sound absorbing sheet 20 overlap).

  In the present embodiment, the one surface 20a side of the sound absorbing sheet 20 is overlapped with the one surface 30a side of the outer sound insulating sheet 30 before the one surface 30a side of the sound insulating sheet 30 melted by the heat generated during manufacture is cooled and solidified. Further, the outer sound insulating sheet 30 and the sound absorbing sheet 20 are sent out while being compressed by being sandwiched between the pair of rollers 5 and 5.

  As a result, the portion on the one surface 20a side of the sound absorbing sheet 20 (fibers 2b of the sound absorbing sheet 20) enters the inside from the one surface 30a of the sound insulating sheet 30 that is melted while maintaining the regularity.

  Then, when the sound insulation sheet 30 is cooled and solidified, as shown in FIG. 2, the portion of the sound absorbing sheet 20 on the one surface side 2a (fiber 2b) is integrated in a state of entering the one surface 30a side of the sound insulating sheet 30, thereby A high sound insulation layer 4 is formed. Accordingly, as shown in FIG. 1, the sound absorbing layer 2 is formed on one surface side of the high sound insulating layer 4, and the sound insulating layer 3 is formed on the other surface side of the high sound insulating layer 4. Is obtained.

  The sound insulating material 1 described above is used in a state where the sound absorbing layer 2 is installed facing the sound source side. The sound insulating layer 3 blocks the sound attenuated by the sound absorbing layer 2 from the sound absorbing layer 2 side and thereby the sound insulating layer 3. Propagation of sound into the space on the side (surface side opposite to the one surface 3a) can be suppressed.

  In addition, the sound insulating material 1 according to the present embodiment has a high sound insulating layer 4 (this embodiment) welded in a state in which the portion of the sound absorbing layer 2 facing the one surface 2a side enters the one surface 3a side of the sound insulating layer 3. Then, the fiber 2b of the sound absorbing layer 2 has a high sound insulating layer 4) welded in a state of entering the inside of the sound insulating layer 3 from the one surface 3a side of the sound insulating layer 3 while maintaining the regularity. For this reason, the sound insulating material 1 has a higher specific gravity than the sound insulating layer 3 (that is, the sound is more difficult to transmit than the sound insulating layer 3), so that the sound can be further blocked by the high sound insulating layer 4. An excellent effect that the sound insulation performance can be exhibited can be obtained.

  Moreover, in the sound insulation material 1, since the thickness of the high sound insulation layer 4 is set in the range of 0.05 mm to 0.5 mm, it is possible to suppress a decrease in the bonding strength between the sound insulation layer 3 and the sound absorption layer 2 and also the sound insulation material. The whole 1 can be set to an appropriate rigidity. Therefore, since the sound insulating material 1 can prevent the sound insulating layer 3 and the sound absorbing layer 2 from being peeled off and can be prevented from being difficult to be deformed, the workability is improved.

  If the thickness of the high sound insulation layer 4 is less than 0.05 mm, the sound insulation layer 3 and the sound absorption layer 2 are easy to peel off, and if it exceeds 0.5 mm, it is difficult to deform (becomes difficult to bend). .05 mm to 0.5 mm.

  And in the manufacturing method of the sound insulation material 1 which concerns on this embodiment, the state (in this embodiment the fiber 2b of the sound absorption sheet 20) has entered the part of the sound absorption sheet 20 on the one surface 30a side of the sound insulation sheet 30. Since the high sound insulation layer 4 is formed by integrating the sound insulation layer 4, the sound is less likely to be transmitted through the high sound insulation layer 4 having a higher specific gravity than the sound insulation sheet 30 (sound insulation layer 3), that is, the sound insulation sheet 30 (sound insulation layer 3). The sound insulating material 1 having the high sound insulating layer 4 can be obtained. Therefore, the manufacturing method of the sound insulating material 1 can have an excellent effect that the sound insulating material 1 having high sound insulating performance can be obtained.

  Further, in the method for manufacturing the sound insulating material 1, before the one surface 30a side of the sound insulating sheet 30 melted by the heat generated at the time of manufacturing the sound insulating sheet 30 cools and hardens, the one surface 20a of the sound absorbing sheet 20 is formed on the one surface 30a side of the sound insulating sheet 30. The sides are overlapped.

  That is, in the method for manufacturing the sound insulating material 1, since the high sound insulating layer 4 is formed using the fact that the one surface 30 a side of the sound insulating sheet 30 is melted when the sound insulating sheet 30 is manufactured, the sound insulating sheet 30 is manufactured after the sound insulating sheet 30 is manufactured. The high sound insulation layer 4 can be formed without requiring the step of remelting the one surface 30a side of the sheet 30 (step of heating the sound insulation sheet 30).

  Note that the sound insulating material according to the present embodiment is not limited to the above-described one embodiment, and various changes may be made without departing from the scope of the present invention.

  In the said embodiment, although the sound absorption layer 2 was provided only in the one surface 3a side of the sound insulation layer 3, it is not limited to this structure, For example, the sound absorption layer 2 may be provided in both surfaces of the sound insulation layer 3. . In this case, the high sound insulation layer 4 is formed between each sound absorption layer 2 and the sound insulation layer 3.

  In the said embodiment, although the sound absorption layer 2 was comprised with the fiber-type material, it is not limited to this structure, For example, it is comprised with foaming (porous) materials, such as a urethane chip and sponge. Also good.

  In the above embodiment, felt is adopted as the fiber material constituting the sound absorbing layer 2, but the structure is not limited to this, and for example, glass wool, rock wool, non-woven fabric, etc. are adopted as the fiber material. May be.

  In the said embodiment, although the sound insulation layer 3 was comprised with the soft plastic, it is not limited to this structure, For example, you may be comprised with asphalt, an olefin type, and a rubber-type material.

  Moreover, in the manufacturing method of the sound insulating material 1 of the above embodiment, the one surface 20a side of the sound absorbing sheet 20 is overlapped with the one surface 30a side of the sound insulating sheet 30 melted by heat. The one surface 20a side of the sound-absorbing sheet 20 may be superimposed on the one surface 30a side of the sound-insulating sheet 30 that has been applied and melted.

  Further, in the method for manufacturing the sound insulating material 1 of the above embodiment, before the one surface 30a side of the sound insulating sheet 30 melted by the heat generated during the manufacture of the sound insulating sheet 30 cools and hardens, the one surface 20a side of the sound absorbing sheet 20 is formed on the one surface 30a. However, the present invention is not limited to this configuration. For example, after the surface 30a side of the sound insulating sheet 30 that has been once cooled and solidified is melted again, the surface 20a side of the sound absorbing sheet 20 is disposed on the surface 30a side of the sound insulating sheet 30. May be superimposed. That is, in the method for manufacturing the sound insulating material 1, the one surface 30 a side of the sound insulating sheet 30 only needs to be in a melted state when being compressed together with the sound absorbing sheet 20 by the rollers 5 and 5.

  DESCRIPTION OF SYMBOLS 1 ... Sound insulation material, 2 ... Sound absorption layer, 2a ... One side of sound absorption layer, 2b ... Sound absorption layer fiber, 3 ... Sound insulation layer, 3a ... One side of sound insulation layer, 4 ... High sound insulation layer, 20 ... Sound absorption sheet, 20a ... one side of sound absorbing sheet, 30 ... sound insulating sheet, 30a ... one side of sound insulating sheet, T1 ... thickness of sound absorbing layer, T2 ... thickness of sound insulating layer, T3 ... thickness of high sound insulating layer

Claims (5)

  A sound absorbing layer made of a fiber-based or foamed material, a sound insulating layer made of soft plastic, and a portion of one side of the sound absorbing layer that is welded in a state of entering one side of the sound insulating layer A sound insulation material comprising a sound insulation layer.   The sound insulating material according to claim 1, wherein the high sound insulating layer has a thickness of 0.05 mm to 0.5 mm.   3. The sound insulating material according to claim 1, wherein the sound absorbing layer is made of a fiber-based material, and the high sound insulating layer is a layer in which fibers of the sound absorbing layer enter one side of the sound insulating layer.   In a state where one side of the sound insulating sheet made of soft plastic is melted, one side of the sound absorbing sheet made of a fiber-based or foamed material is superimposed on one side of the sound insulating sheet, and the sound insulating sheet and the sound absorbing A method for producing a sound insulation material, wherein a high sound insulation layer is formed by applying a compressive force to a sheet so that the one surface side portion of the sound absorbing sheet is integrated into the one surface side of the sound insulation sheet.   The method for producing a sound insulating material according to claim 4, wherein the one surface side of the sound absorbing sheet is superposed on the one surface side of the sound insulating sheet melted by heat.

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