Low heat build-up capstock system and extrusion technology for solid and foamed profiles in dark colors
A weatherable, low heat build-up capstock system comprising an acrylic cap, a pigment system that is IR transparent to a greater degree than existing pigment systems, an IR reflective substrate, and an extrusion system for same.
1. A method of producing a fenestration extrudate comprising the steps of:
forming a fenestration extrudate that is substantially reflective of solar infrared radiation; the fenestration extrudate being formed from a first thermoplastic resin having greater than about 8 parts TiO 2 per hundred parts resin;
extruding a dark-colored capstock over a portion of the fenestration extrudate with a capstocking extruder to provide a capstocked fenestration extrudate; the dark-colored capstock having an Lh value between 13 and 40; the dark-colored capstock having a thickness of between 4 and 30 thousandths of an inch and being made with a second thermoplastic resin having pigments that are transmissive of solar infrared radiation; and
wherein the capstocked fenestration extrudate exhibits a predicted horizontal heat build-up under ASTM D4803 of less than about 56 degrees Fahrenheit.
2. The method of claim 1 , further comprising the steps of moving the capstocked fenestration extrudate into a heating tube having upstream and downstream ends and blowing hot air from a heater into at least one end of the heating tube such that the surface of the extrudate is heated.
3. The method of claim 2 , further comprising the step of heating the extrudate until the surface temperature of the extrudate at the downstream end of the heating tube exceeds a temperature of 115 degrees Fahrenheit.
4. The method of claim 2 , further comprising the step of heating the extrudate until the surface temperature of the extrudate at the downstream end of the heating tube exceeds a temperature of 145 degrees Fahrenheit.
5. The method of claim 1 , further comprising the step of extruding the dark-colored capstock at a thickness of less than about 20 thousandths of an inch.
6. The method of claim 1 , further comprising the step of extruding the dark-colored capstock at a thickness of less than about 10 thousandths of an inch.
7. The method of claim 1 , further comprising the step of extruding the dark-colored capstock at a thickness of less than about 8 thousandths of an inch.
8. The method of claim 7 , further comprising the step of forming the fenestration extrudate from a first thermoplastic resin having between 8 and 11 parts TiO 2 per hundred parts resin.
9. The method of claim 1 , further comprising the step of forming the fenestration extrudate from a first thermoplastic resin having between 8 and 11 parts TiO 2 per hundred parts resin.
10. A method of producing a fenestration extrudate comprising the steps of:
forming a fenestration extrudate;
extruding an inner capstock onto the fenestration extrudate; the inner capstock being substantially reflective of solar infrared radiation; the inner capstock being formed from a first thermoplastic resin having greater than about 8 parts TiO 2 per hundred parts resin;
extruding a dark-colored capstock over a portion of the inner capstock with a capstocking extruder to provide a capstocked fenestration extrudate; the dark-colored capstock having an Lh value between 13 and 40; the dark-colored capstock having a thickness of between 4 and 30 thousandths of an inch and being made with a second thermoplastic resin having pigments that are transmissive of solar infrared radiation; and
wherein the capstocked fenestration extrudate exhibits a predicted horizontal heat build-up under ASTM D4803 of less than about 56 degrees Fahrenheit.
11. The method of claim 10 , further comprising the steps of moving the capstocked fenestration extrudate into a heating tube having upstream and downstream ends and blowing hot air from a heater into at least one end of the heating tube such that the surface of the extrudate is heated.
12. The method of claim 11 , further comprising the step of heating the extrudate until the surface temperature of the extrudate at the downstream end of the heating tube exceeds a temperature of 115 degrees Fahrenheit.
13. The method of claim 11 , further comprising the step of heating the extrudate until the surface temperature of the extrudate at the downstream end of the heating tube exceeds a temperature of 145 degrees Fahrenheit.
14. The method of claim 10 , further comprising the step of extruding the dark-colored capstock at a thickness of less than about 20 thousandths of an inch.
15. The method of claim 10 , further comprising the step of extruding the dark-colored capstock at a thickness of less than about 10 thousandths of an inch.
16. The method of claim 10 , further comprising the step of extruding the dark-colored capstock at a thickness of less than about 8 thousandths of an inch.
17. The method of claim 16 , further comprising the step of forming the inner capstock from a first thermoplastic resin having between 8 and 11 parts TiO 2 per hundred parts resin.
18. The method of claim 10 , further comprising the step of forming the inner capstock from a first thermoplastic resin having between 8 and 11 parts TiO 2 per hundred parts resin.