Plaster boards and methods for making them
The present disclosure relates to plaster boards and methods for making them. For example, one aspect of the disclosure is a plaster board comprising one or more continuous layers of material disposed within a body of hardened plaster material, the first side and second side of each continuous layer of material being substantially covered by the hardened plaster material. In certain such embodiments, each continuous layer of material includes a polymer (e.g., a damping polymer) disposed on a carrier sheet. Another aspect of the disclosure relates to a method for making a plaster board that involves drying a wet body of plaster material while a continuous layer of material or precursor therefor is disposed within it.
1. A method for making a plaster board having a first surface and an opposed second surface the plaster board comprising
a body of hardened plaster material extending from the first surface of the plaster board to the second surface of the plaster board, and
one or more continuous layers of material disposed within the body and extending along a first axis to two opposed edges of the plaster board, each continuous layer of material having a first side and an opposed second side, the first side and second side of each continuous layer of material being covered by and in contact with the hardened plaster material, each continuous layer being a damping sheet having a damping loss factor that is greater than a damping loss factor of the hardened plaster material, the damping sheet comprising a viscoelastic polymer and having a damping loss factor of at least 5%,
the method comprising:
providing a wet plaster board precursor having a first surface and an opposed second surface, the wet plaster board precursor comprising:
a body of wet plaster material extending from the first surface of the wet plaster board precursor to the second surface of the wet plaster board precursor; and
one or more precursors of the continuous layers of material disposed within the body of wet plaster material, each precursor of the continuous layer of material being a damping precursor sheet comprising a carrier sheet and a thermally-curable formulation disposed thereon, each continuous layer of material or precursor therefor having a first side and an opposed second side, the first side and the second side of each continuous layer of material or precursor therefor being covered by and in contact with the wet plaster material; and
drying the wet plaster board precursor such that the wet plaster material hardens into the body of hardened plaster material, and such that heat provided during the hardening of the plaster material cures the thermally-curable formulation to form to the viscoelastic polymer, thereby forming the continuous layer of material within the body of hardened plaster material.
2. The method of claim 1 , wherein the plaster material comprises a base material that is a gypsum material.
3. The method of claim 1 , wherein the carrier sheet comprises a fiberglass mat or a fiberglass fabric.
4. The method of claim 1 , wherein the carrier sheet comprises a sheet of foamed polymer.
5. The method of claim 1 , wherein providing the damping precursor sheet comprises spraying the thermally-curable formulation onto the carrier sheet.
6. The method of claim 1 , wherein the damping polymer has a shear modulus in the range of 10 kPa to 100 MPa.
7. The method of claim 1 , wherein the damping loss factor for each damping sheet is at least 5%.
8. The method of claim 1 , wherein the one or more continuous layers of material are a single continuous layer of material.
9. The method of claim 1 , wherein the one or more continuous layers of material are a plurality of continuous layers of material, comprising at least
a first continuous layer of material that is elongated in parallel with a first axis of the plaster board, and
a second continuous layer of material that is elongated in parallel with the first axis of the plaster board.
10. The method of claim 1 , wherein providing the wet plaster board precursor comprises dispensing the body of wet plaster material onto a conveyer.
11. The method of claim 10 , wherein a sheet of backing material is disposed on the conveyor, such that the body of wet plaster material is disposed on the backing material.
12. The method of claim 1 , wherein providing the wet plaster board precursor comprises providing a first layer of wet plaster material, providing the one or more continuous layers of material or precursors therefor on the first layer of wet plaster material, and providing a second layer of wet plaster material on the one or more continuous layers of material or precursors therefor.
13. The method of claim 1 , wherein the viscoelastic damping polymer has a damping loss factor in the range 5% to 30%.
14. The method of claim 1 , wherein the viscoelastic damping polymer has a shear modulus in the range of 100 kPa to 100 mPa.
15. The method of claim 1 , wherein each damping sheet is at least 20% less rigid than the body of the hardened plaster material as measured by ASTM E75-05.
16. The method of claim 1 , wherein the thermally-curable formulation is a liquid or semiliquid.
17. The method of claim 1 , wherein the thermally-cured material is a viscoelastic glue.
18. The method of claim 1 , wherein the thermally-curable formulation is selected from GreenGlue, Weber Glue, or a heat-curable silicone or acrylic.
19. The method of claim 1 , wherein the heat provided during the hardening of the plaster material is about 100° C.
20. The method of claim 1 , wherein the heat provided during the hardening of the plaster material cures the thermally-curable formulation in about half an hour.