Impact-cushioning sheets and direct-applying restraint type floor damping structures using the same
AssigneeHayakawa Rubber Company Limited
InventorsHirofumi Kakimoto, Osamu Kiso, Shinya Shimada
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Abstract
An impact-cushioning sheet comprises an air enclosed film base having concave portions or a perforated base material composed of fiberboard and/or foamed body and a crosslinked viscoelastic body filled in the concave portions or holes and having specified properties. A direct-applying restraint type floor damping structure is manufactured by adhering a floor component part to at least one surface of the impact-cushioning sheet.
Claims9
An impact-cushioning sheet, comprising:
- a film base constituted by alternately arranging convex portions having air enclosed therein and concave portions made only of a film;
- and
- a crosslinked viscoelastic body filled in the concave portions of the film base and/or over the whole surface of the film base abd obtained by curing a viscoelastomeric substance at room temperature;
- said crosslinked viscoelastic body retaining its shape even when being warmed at 80.degree. C. and having a hardness at 20.degree. C. of not more than 50 as measured by a C-type hardness tester according to a standard SRIS-0101 in The Society of Rubber Industry, Japan, wherein a ratio of total air volume in the convex portions of the film base to total viscoelastic body volume filled in the concave portions of the film base is within a range of convex portion:
- concave portion of 2:8 to about 8:2, and a height of the convex portion is not more than 6 mm.
An impact-cushioning sheet, comprising:
- a perforated base material composed of fiberboard or foamed body, or a laminate thereof, having a hole area of 0.03 to about 13 cm.sup.2 and a thickness of 2 to about 20 mm;
- and
- a crosslinked viscoelastic body filled in hole portions in said hole area and/or over the whole surface of the base material, and obtained by curing a viscoelastomeric substance at room temperature;
- said crosslinked viscoelastic body retaining its shape even when being warmed at 80.degree. C. and having a hardness at 20.degree. C. of not more than 50 as measured by a C-type hardness tester according to a standard SRIS-0101 in The Society of Rubber Industry, Japan, wherein a rttio of total hole area to whole area of the base material other than the hole portions is within a range of 2:8 to about 8:2.
A direct-applying resistant type floor damping structure, comprising an impact-cushioning sheet and a floor component part adhered to at least one surface of the sheet, said impact-cushioning sheet comprising:
- a film base constituted by alternately arranging convex portions having air enclosed therein and concave portions made only of a film;
- and
- a crosslinked viscoelastic body filled in the concave portions of the film base and/or over the whole surface of the film base, and obtained by curing a viscoelastomeric substance at room temperature;
- said crosslinked viscoelastic body retaining its shape even when being warmed at 80.degree. C. and having a hardness at 20.degree. C. of not more than 50 as measured by a C-type hardness tester according to a standard SRIS-0101 in The Society of Rubber Industry, Japan, wherein a ratio of total air volume in the convex portions of the film base to total viscoelastic body volume filled in the concave portions of the film base is within a range of convex portion:
- concave portion of 2:8 to about 8:2 and a height of the convex portion is not more than 6 mm.
A direct-applying restraint type floor damping structure, comprising an impact-cushioning sheet and a floor component part adhered to at least one surface of the sheet, said impact-cushioning sheet comprising:
- a perforated base material composed of fiberboard or foamed body, or a laminate thereof, having a hole area of 0.03 to about 13 cm.sup.2 and a thickness of 2 to about 20 mm;
- and
- a crosslinked viscoelastic body filled in the hole portions and/or over the whole surface of the base material, and obtained by curing a viscoelastomeric substance at room temperature;
- said crosslinked viscoelastic body retaining its shape eve when being warmed at 80.degree. C. and having a hardness of 20.degree. C. of not more than 50 as measured by a C-type hardness tester according to a standard SRIS-0101 in The Society of Rubber Industry, Japan, wherein a ratio of total hole area to whole area of the base material other than the hole portions is within a range of 2:8 to about 8:2.
Dependencies are inferred from the claim text.