Sound-insulating sheet member and sound-insulating structure provided with same
To provide a sound-insulating sheet member capable of being installed in a location with a limited installation space and allowing for insulation of low-frequency sound, and a sound-insulating structure body including the sound-insulating sheet member. A sound-insulating sheet member including a sheet portion having rubber elasticity, and a plurality of protrusion portions that is provided on at least one face of the sheet portion and that has rubber elasticity, in which at least one of the protrusion portions and a region of the sheet portion, where the protrusion portions are provided, contains a space portion.
1 . A sound-insulating sheet member comprising:
A sheet portion having rubber elasticity; and
A plurality of protrusion portions that is provided on at least one face of the sheet portion and that has rubber elasticity,
Wherein a region of the sheet portion, where the protrusion portion are provided, contains a space portion,
The space portion of the sheet portion extends to the protrusion portions such that the protrusion portion contains the space portion, and
The space portion of the sheet portion penetrates through a face of the sheet portion, the face being opposite to a face where the protrusion portions are provided.
2 . The sound-insulating sheet member according to claim 1 wherein the protrusion portions do no contain a though-hole connecting the space portion and an external.
3 . The sound-insulating sheet member according to claim 1 wherein, in a cross section where an area proportion occupied by the space portion is maximum in a cross section of the protrusion portions in a planar direction of the sheet portion, the proportion is 90% or less.
4 . The sound-insulating sheet member according to claim 1 wherein, in a cross section where an area proportion occupied by the space portion is maximum in a cross section of the protrusion portions in a planar direction of the sheet portion, the proportion is 20% or more.
5 . The sound-insulating sheet member according to claim 1 wherein a volume proportion occupied by the space portion in the protrusion portion is 10% or more.
6 . The sound-insulating sheet member according to claim 1 wherein one part of the space portion of the protrusion portions is provided so as to reach at least any face of a tip face and a side face of the protrusion portions.
7 . The sound-insulating sheet member according to claim 1 , wherein the protrusion portions contain a weight portion at a tip.
8 . The sound-insulating sheet member according to claim 7 , wherein a ratio (DP/DW) of an equivalent diameter DP of the protrusion portions, represented by the following expression, to an equivalent diameter DW of the weight portion, represented by the following expression, is 1.25 or more:
DP= 4 AP/pP
DW= 4 AW/pW
DP: the equivalent diameter of the protrusion portions
DW: the equivalent diameter of the weight portion
AP: an area of a region formed from an outer perimeter of a cross section of the protrusion portions in the planar direction of the sheet portion
AW: an area of a region formed from an outer perimeter of a cross section of the weight portion in the planar direction of the sheet portion
pP: a length of an outer perimeter of a cross section of the protrusion portions in the planar direction of the sheet portion
pW: a length of an outer perimeter of a cross section of the weight portion in the planar direction of the sheet portion.
9 . The sound-insulating sheet member according to claim 7 , wherein a ratio (H/DP) of a total value H of a height of the protrusion portions and a thickness of the sheet portion, to DP represented by the following expression, is 2.1 or less:
DP= 4 AP/pP
DP: the equivalent diameter of the protrusion portions
AP: an area of a region formed from an outer perimeter of a cross section of the protrusion portions in the planar direction of the sheet portion
pP: a length of an outer perimeter of a cross section of the protrusion portions in the planar direction of the sheet portion.
10 . The sound-insulating sheet member according to claim 7 , wherein at least a part of the weight portion is embedded in the protrusion portions.
11 . The sound-insulating sheet member according to claim 1 , wherein the sound-insulating sheet member is an integrated molded article.
12 . A sound-insulating structure body comprising at least the sound-insulating sheet member according to claim 1 , and a support supporting the sound-insulating sheet member.
13 . The sound-insulating structure body according to claim 12 , wherein the sheet portion and the protrusion portions independently comprise at least one selected from the group consisting of a thermosetting elastomer, a photo-curable elastomer, and a thermoplastic elastomer.
14 . The sound-insulating sheet member according to claim 1 ,
wherein only the sheet portion contains the space portion, and
the space portion of the sheet portion penetrates through a face of the sheet portion, the face being opposite to a face where the protrusion portions are provided.
15 . The sound-insulating sheet member according to claim 1 ,
wherein the space portion of the sheet portion extends to the protrusion portions such that the protrusion portion contains the space portion,
the space portion of the sheet portion penetrates through a face of the sheet portion, the face being opposite to a face where the protrusion portions are provided, and
a cross section width of the space portion of the sheet portion is the same as a cross section width of the space portion of the protrusion portion.
16 . The sound-insulating sheet member according to claim 1 ,
wherein the space portion of the sheet portion extends to the protrusion portions such that the protrusion portion contains the space portion,
the space portion of the sheet portion penetrates through a face of the sheet portion, the face being opposite to a face where the protrusion portions are provided, and
a cross section width of the space portion of the sheet portion is smaller than a cross section width of the space portion of the protrusion portion.