초록 ▼

A multilayered, sound-insulating, mechanically strong sandwich element comprising two facing layers ( 1 ) substantially attached to a plastic foam core consisting of at least two layers ( 2 ) which are joined through contact points (also called bridges) ( 3 ) creating a gap or gaps ( 4 ) between the

A multilayered, sound-insulating, mechanically strong sandwich element comprising two facing layers ( 1 ) substantially attached to a plastic foam core consisting of at least two layers ( 2 ) which are joined through contact points (also called bridges) ( 3 ) creating a gap or gaps ( 4 ) between the core layers ( 2 ), and in case of long spans and/or thin facing layers, travel stops inside the gap/gaps ( 4 ) to keep the core layers ( 2 ) at a certain distance from each other, wherein the core layer material is a semi-rigid, cellular material containing more tan 50 percent open cells, and has a tensile strength of more than 50 kPa, and has a compressive strength from 5 to 200 kPa, at 10 percent deformation. The distance between the contact points or bridges ( 3 ) is at least 350 mm. The new sandwich element can be used as a sound-insulating door, a partition element or a construction unit.

대표청구항 ▼

1. A multilayered, sound-insulating sandwich element comprising facing layers and a plastic foam core located between the facing layers and attached to the facing layers, the plastic foam core presenting at least one cavity, characterized in that each cavity is a gap which is positioned parallel to

1. A multilayered, sound-insulating sandwich element comprising facing layers and a plastic foam core located between the facing layers and attached to the facing layers, the plastic foam core presenting at least one cavity, characterized in that each cavity is a gap which is positioned parallel to the facings and is located within the core, the core material is a semi-rigid, cellular material containing more than 50 percent open cells and having a tensile strength of more than 50 kPa and a compressive strength from 5 kPa to 200 kPa at 10 percent deformation, wherein each gap is defined by two plastic foam core layers and contact points providing structural junctions between the two plastic foam core layers while keeping the plastic foam core layers separated. 2. The element according to claim 1 wherein the plastic foam core material has more than 90 percent open cells. 3. The element according to claim 1 wherein the plastic foam core material has a tensile strength of more than 90 kPa. 4. The element according to claim 1 wherein the plastic foam core material has a compressive strength from 15 kPa to 80 kPa at 10 percent deformation. 5. The element according to claim 1 wherein the distance between the contact points is at least 350 mm. 6. The element according to claim 5 wherein the distance is at least 450 mm. 7. The element according to claim 5 wherein the distance is at least 600 mm. 8. The element according to claim 1 wherein the plastic foam core layer comprises more than one type of foam. 9. The element according to claim 1 wherein each facing layer has a thickness in the range from 0.5 mm to 200 mm and the plastic foam core layer has a thickness in the range from 20 mm to 200 mm. 10. The element according to claim 1 wherein the plastic foam core layers are different in thickness. 11. The element according to claim 1 wherein the plastic foam core layer material has an air flow resistivity from 5000 Ns/m 4 to 300,000 Ns/m 4 . 12. The element according to claim 1 wherein the plastic foam core layer material has a loss factor of more than 0.2. 13. The element according to claim 1 wherein travel stops are provided at least one of the core layers and within the gap in order to keep the core layers at a certain distance from each other. 14. The element according to claim 13 wherein the distance of the travel stops from the opposite core layer or the distance of the core layers from each other, at 0 percent deformation, ranges from 2 to 10 mm. 15. The element according to claim 1 wherein the total contact points area is related to the total area of the sandwich element in a ratio of less than 30 percent. 16. The element according to claim 15 wherein the said ratio is less than 15 percent. 17. The element according to claim 1 wherein the facing layer material is metal sheet. 18. The element according to claim 17 wherein the facing layer is steel. 19. The element according to claim 17 wherein the facing layer is aluminum. 20. The element according to claim 17 wherein the facing layer is wood sheet. 21. The element according to claim 1 wherein the contact points are plastic foam, plastic, metal or wood strips of a thickness of from 0.5 mm to 100 mm and a width from 10 mm to 100 mm. 22. The element according to claim 1 wherein the element is a door, a partition element or a construction unit. 23. The element according to claim 1 wherein the element is a clay brick or gypsum plaster stone.