초록

An extruded, coalesced foam strand propylene polymer material that is either open-celled and useful for sound insulation applications or close celled and useful for thermal insulation applications. An apparatus suitable for preparing such foams with an expanded cross-section.

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1. An extruded, open-cell, coalesced foam strand material that comprises a propylene polymer material and has a density of 20 kilograms per cubic meter or less, an open-cell content of at least 20 percent and a cell size of two millimeters or less. 2. An extruded, open-cell, acoustically active, coa

1. An extruded, open-cell, coalesced foam strand material that comprises a propylene polymer material and has a density of 20 kilograms per cubic meter or less, an open-cell content of at least 20 percent and a cell size of two millimeters or less. 2. An extruded, open-cell, acoustically active, coalesced foam strand material that comprises a propylene polymer material and has a density of 100 kilograms per cubic meter or less, an open-cell content of at least 50 percent, a cell size of two millimeters or less and, in its extrusion direction, a noise reduction coefficient of at least 0.3, the foam having defined therein a plurality of perforation channels, the channels being oriented in a direction generally perpendicular to the extrusion direction. 3. An extruded, open-cell, coalesced foam strand material that comprises a propylene polymer material and has a density ≤22 kg/m3and an open-cell content ≥80 percent. 4. The material of claim 1 having an open-cell content of at least 50 percent. 5. The material of claim 1 having an airflow resistivity less than 25 kilopascal seconds per square meter. 6. The material of claim 2 having an airflow resistivity less than 25 kilopascal seconds per square meter. 7. The material of claim 1 having an open-cell content of at least 80 percent. 8. The material of claim 2 having an open-cell content of at least 80 percent. 9. The material of claim 2, wherein the perforation channels occur at a frequency of at least one bole per square centimeter with a spacing between holes of about 10 millimeters. 10. The material of claim 2, wherein the perforation channels occur at a frequency of at least four holes per square centimeter with a spacing between holes of about 5 millimeters. 11. The material of claim 2, wherein the perforation channels are mechanically induced. 12. The material of claim 2, wherein the material, following elastification, has a dynamic modulus of less than 1 Newton per square millimeter. 13. The material of claim 12, wherein the dynamic modulus is less than 0.6 Newton per square millimeter. 14. The material of claim 4, wherein the dynamic modulus is less than 1 Newton per square millimeter. 15. The material of claim 4, wherein the dynamic modulus is less than 0.6 Newton per square millimeter. 16. A sound insulation structure comprising at least one layer of the material of claim 12. 17. A sound insulation structure comprising at least one layer of the material of claim 14. 18. The material of claim 1, wherein the material has an open cell content less than 80 percent and a thermal conductivity of no more than 45 milliwatts per meter ° Kelvin. 19. The material of claim 18 wherein the material has an open cell content less than 70 percent and a thermal conductivity of no more than 40 milliwatts per meter ° Kelvin. 20. The material of claim 18 wherein the material has an open cell content less than 60 percent and a thermal conductivity is no more than 35 milliwatts per meter ° Kelvin.