Polymer Sheeting
Disclosed herein is polymer sheeting articles. In one embodiment a multiwall sheet is disclosed. The multiwall sheet comprises: a top layer, a bottom layer, a web disposed between the top layer and the bottom layer, and two or more air gaps in a perpendicular line between the top layer and the bottom layer. The multiwall sheet exhibits a U-value of less than or equal to 2.3 W/m 2 K, and has an AgUT ratio of greater than or equal to about 0.168.
1 . A multiwall sheet, comprising:
a top layer;
a bottom layer;
a web disposed between the top layer and the bottom layer; and
two or more air gaps in a perpendicular line between the top layer and the bottom layer;
wherein the multiwall sheet exhibits a U-value of less than or equal to 2.3 W/m 2 K, and has an AgUT ratio of greater than or equal to about 0.168.
2 . The multiwall sheet according to claim 1 , wherein the ratio of the total thickness to the number of air gaps is greater than or equal to about 2.0 and less than or equal to about 2.5.
3 . The multiwall sheet according to claim 1 , wherein the multiwall sheet is formed from polycarbonate.
4 . The multiwall sheet according to claim 3 , wherein the polycarbonate comprises an ultraviolet light absorber.
5 . The multiwall sheet according to claim 1 , comprising a total thickness that is less than or equal to about 32 mm.
6 . The multiwall sheet according to claim 1 , wherein the multiwall sheet has a ratio of total thickness to U-value of greater than or equal to about 4.3.
7 . A multiwall sheet, comprising:
a top layer;
a bottom layer;
a first rib disposed between and connected to the top layer and to the bottom layer;
a second rib disposed between and connected to the top layer and the bottom layer;
a web connected to the first rib and connected to the second rib, wherein the web has a wall thickness that is less than or equal to about 0.05 mm; and
a number of air gaps in a perpendicular line between the top layer and the bottom layer,
wherein the multiwall sheet comprises a total thickness, and wherein the ratio of the total thickness to the number of air gaps is less than or equal to about 2.5.
8 . The multiwall sheet according to claim 7 , wherein the ratio of the total thickness to the number of air gaps is greater than or equal to about 2.0 and less than or equal to about 2.5.
9 . The multiwall sheet according to claim 7 , wherein the multiwall sheet has a U-value that is less than or equal to 2.3 W/m 2 K.
10 . The multiwall sheet according to claim 7 , wherein the total thickness is equal to or less than about 32 mm.
11 . The multiwall sheet according to claim 7 , wherein the multiwall sheet has an AgUT ratio of greater than or equal to about 0.168.
12 . The multiwall sheet according to claim 7 , further comprising a gap height of greater than or equal to about 1.76 mm.
13 . The multiwall sheet according to claim 7 , wherein the multiwall sheet is formed from polycarbonate.
14 . The multiwall sheet according to claim 13 , wherein the polycarbonate comprises an ultraviolet light absorber.
15 . The multiwall sheet of claim 7 , further comprising a coating and/or coextrusion layer disposed on the top layer and/or bottom layer.
16 . The multiwall sheet of claim 15 , wherein the coating and coextrusion layer are, independently chosen from the group consisting of antifungal coatings, hydrophobic coatings, hydrophilic coatings, light dispersion coatings, anti-condensation coatings, scratch resistant coatings, ultraviolet absorbing coatings, light stabilizer coatings, and combinations comprising at least one of the foregoing.
17 . A multiwall sheet, comprising:
a top layer;
a bottom layer;
a first rib disposed between and connected to the top layer and to the bottom layer;
a second rib disposed between and connected to the top layer and the bottom layer;
a web connected to the first rib and connected to the second rib;
a total thickness that is less than or equal to about 32 mm; and
two or more air gaps in a perpendicular line between the top layer and the bottom layer;
wherein the multiwall sheet exhibits a U-value of less than or equal to about 2.3 W/m 2 K, and has an AgUT ratio of greater than or equal to about 0.168.
18 . The multiwall sheet according to claim 17 , wherein the ratio of the total thickness to the number of air gaps is greater than or equal to about 2.0 and less than or equal to about 2.5.
19 . The multiwall sheet according to claim 18 , wherein the multiwall sheet is formed from polycarbonate comprising an ultraviolet light absorber.
20 . The multiwall sheet according to claim 17 , wherein the multiwall sheet has a ratio of total thickness to U-value of greater than or equal to about 4.3.