Insulation board and process of making
AssigneeUnion Carbide Corporation
InventorsJeffert J. Nowobilski, William J. Owens
Life of this patent
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Abstract
Insulation board capable of bearing a load without significant loss of insulating capacity due to compression, produced by a method wherein the board is made in compliance with specified conditions of time, temperature and pressure.
Claims19
Insulation board having a density less than 30 pounds per cubic foot and capable of bearing a load, produced by a process comprising:
- (a) providing a stack of substantially binderless glass fiber sheets in an amount sufficient to achieve insulation board of desired density less than 30 pounds per cubic foot;
- (b) providing a press to compress the stack;
- (c) heating the stack and the press to a temperature in the range of from the glass strain temperature to less than the glass softening temperature for a time period sufficient to achieve thermal equilibration of the stack and the press surface;
- (d) thereafter compressing the stack by applying a light vertically compressive force of from 0.2 to 5.0 pounds per square inch to the stack with the press, at said thermal equilibrium for a time period sufficient to produce insulation board of desired density and to substantially relieve stress within the board;
- and
- (e) cooling the compressed glass fiber stack to ambient temperature.
Insulation board having a density less than 30 pounds per cubic foot and capable of bearing a load, produced by a process comprising:
- (a) heating binder-containing glass fiber sheets at a temperature in the range of from equal to, to 400.degree. F. below, the glass strain temperature for a time period sufficient to remove essentially all of the binder material in the glass fiber sheets and providing a stack of said binderless glass fiber sheets in an amount sufficient to achieve insulation board of desired density less than 30 pounds per cubic foot;
- (b) providing a press to compress the stack;
- (c) heating the stack and the press to a temperature in the range of from the glass strain temperature to less than the glass softening temperature for a time period sufficient to achieve thermal equilibration of the stack and the press surface;
- (d) thereafter compressing the stack by applying a light vertically compressive force of from 0.2 to 5.0 pounds per square inch to the stack with the press, at said thermal equilibrium for a time period sufficient to produce insulation board of desired density and to substantially relieve stress within the board;
- and
- (e) cooling the compressed glass fiber stack to ambient temperature.
A process for producing insulation board having a density of less than 30 pounds per cubic foot and capable of bearing a load comprising:
- (a) providing a stack of substantially binderless glass fiber sheets in an amount sufficient to achieve insulation board of desired density less than 30 pounds per cubic foot;
- (b) providing a press to compress the stack;
- (c) heating the stack and the press to a temperature in the range of from the glass strain temperature to less than the glass softening temperature for a time period sufficient to achieve thermal equilibration of the stack and the press surface;
- (d) thereafter compressing the stack by applying a light vertically compressive force of from 0.2 to 5.0 pounds per square inch to the stack with the press, at said thermal equilibrium for a time period sufficient to produce insulation board of desired density and to substantially relieve stress within the board;
- and
- (e) cooling the compressed glass fiber stack to ambient temperature.
A process for producing insulation board having a density of less than 30 pounds per cubic foot and capable of bearing a load comprising:
- (a) heat binder-containing glass fiber sheets at a temperature in the range of from equal to, to 400.degree. F. below, the glass strain temperature for a time period sufficient to remove essentially all of the binder material in the glass fiber sheets and providing a stack of said binderless glass fiber sheets in an amount sufficient to achieve insulation board of desired density less than 30 pounds per cubic foot;
- (b) providing a press to compress the stack;
- (c) heating the stack and the press to a temperature in the range of from the glass strain temperature to less than the glass softening temperature for a time period sufficient to achieve thermal equilibration of the stack and the press surface;
- (d) thereafter compressing the stack by applying a light vertically compressive force of from 0.2 to 5.0 pounds per square inch to the stack with the press, at said thermal equilibrium for a time period sufficient to produce insulation board of desired density and to substantially relieve stress within the board;
- and
- (e) cooling the compressed glass fiber stack to ambient temperature.
Insulation board essentially free of binder, capable of bearing a load and having a density less than 30 pounds per cubic foot comprised of compressed glass fibers oriented essentially in planes parallel to one another so as to have substantially only point contact between fibers.
Dependencies are inferred from the claim text.