Method of making annealed door skins and composite door assemblies, and related articles
A method is provided for making an annealed door skin or composite door assembly. At least the door skin is formed of a composition comprising a thermoset binder and fiberglass. The door skin, alone or in combination with other parts of a door assembly, is subjected to annealing to make the annealed door skin. The process of annealing comprises the step of heating the door skin, alone or in combination with other parts of the door assembly, above the glass transition temperature yet below the thermal degradation temperature of the thermoset binder for a sufficient amount of time to cause release internal stresses in the door skin, then the step of cooling the door skin.
1. A method for making an annealed door skin, comprising:
annealing a door skin comprising a thermoset binder and fiberglass to make an annealed door skin, said annealing comprising
heating the door skin above the glass transition temperature yet below the thermal degradation temperature of the thermoset binder for a sufficient amount of time to release of internal stresses in the door skin; and
cooling the door skin.
2. The method as defined in claim 1 , wherein said heating is conducted at or above about 200° F.
3. The method as defined in claim 1 , wherein the sufficient amount of time is at least 24 hours.
4. The method as defined in claim 1 , wherein the sufficient amount of time is at least 48 hours.
5. The method as defined in claim 1 , wherein said cooling comprises cooling the door skin at a rate of about 50° F. or less per hour.
6. The method as defined in claim 1 , wherein said cooling comprises cooling the door skin at a rate of about 25° F. or less per hour.
7. The method as defined in claim 1 , wherein said cooling comprises cooling the door skin at a rate of about 15° F. per hour.
8. The method as defined in claim 1 , wherein said cooling comprises cooling the door skin to about 125° F. at a rate of about 15° F. per hour.
9. The method as defined in claim 1 , wherein said heating is conducted at or above about 180° F. for at least 48 hours, and wherein said cooling comprises cooling the door skin at a rate of about 50° F. or less per hour.
10. A method for making an annealed composite door, comprising:
annealing a composite door comprising a door frame and first and second door skins on opposite sides of the door frame to make an annealed composite door, at least the first door skin comprising a thermoset binder and fiberglass, said annealing comprising
heating the composite door above the glass transition temperature yet below the thermal degradation temperature of the thermoset binder for a sufficient amount of time to cause release internal stresses in the door skin; and
cooling the composite door.
11. The method as defined in claim 10 , wherein said heating is conducted at or above about 200° F.
12. The method as defined in claim 10 , wherein the sufficient amount of time is at least 24 hours.
13. The method as defined in claim 10 , wherein the sufficient amount of time is at least 48 hours.
14. The method as defined in claim 10 , wherein said cooling comprises cooling the door skin at a rate of about 50° F. or less per hour.
15. The method as defined in claim 10 , wherein said cooling comprises cooling the door skin at a rate of about 15° F. per hour.
16. The method as defined in claim 10 , wherein said heating is conducted at or above about 200° F. for at least 24 hours, and wherein said cooling comprises cooling the door skin at a rate of about 50° F. or less per hour.
17. The method as defined in claim 10 , wherein said heating is conducted at or above about 180° F. for at least 48 hours, and wherein said cooling comprises cooling the door skin at a rate of about 50° F. or less per hour.
18. The method as defined in claim 1 , wherein said heating is conducted at or above about 200° F. for at least 24 hours, and wherein said cooling comprises cooling the door skin at a rate of about 50° F. or less per hour.
19. A method for making an annealed composite door, comprising:
annealing a composite door comprising a door frame and first and second door skins on opposite sides of the door frame to make an annealed composite door, at least the first door skin comprising a thermoset binder and fiberglass, said annealing comprising
heating the composite door in a range of 180-220° F. for at least 24 hours; and
cooling the composite door at a rate of about 50° F. or less per hour.
20. The method as defined in claim 19 , wherein said heating is maintained for at least 48 hours.
21. The method as defined in claim 19 , wherein said cooling comprises cooling the first door skin at a rate of about 25° F. or less per hour.
22. The method as defined in claim 19 , wherein said cooling comprises cooling the first door skin at a rate of about 15° F. or less per hour.
23. The method as defined in claim 19 , wherein said cooling comprises cooling the first door skin to about 125° F. at a rate of about 15° F. per hour.
24. The method as defined in claim 1 , wherein the door skin is a door skin of a residential or commercial building.
25. The method as defined in claim 10 , wherein the door skin is a door skin of a residential or commercial building.
26. The method as defined in claim 19 , wherein the door skin is a door skin of a residential or commercial building.