Claims
- 1. A thermal insulating structure comprising:
- (1) a honeycomb spacer having notches on one edge of the honeycomb spacer;
- (2) cells of the honeycomb spacer partially filled with foam wherein
- (a) an empty space exists along portions of the honeycomb spacer having the notches;
- (b) an integral foam skin covers the other edge of the honeycomb spacer;
- (c) foam filling the remainder of the cells; and
- (3) the density of foam within a majority of the cells is between from about 2 pounds per cubic foot to about 20 pounds per cubic foot and the density of the integral foam skin is between from about 20 pounds per cubic foot to about 80 pounds per cubic foot.
- 2. The structure according to claim 1 wherein the foam is polyurethane.
- 3. A cryogenic insulating structure comprising:
- (a) a honeycomb spacer having notches on one edge of the honeycomb spacer;
- (b) cells of the honeycomb spacer partially filled with polyurethane foam wherein
- (1) an empty space exists along portions of the honeycomb spacer having the notches;
- (2) an integral polyurethane foam skin covers the other edge of the honeycomb spacer;
- (3) polyurethane foam filling the remainder of the cells; and
- (c) the density of the foam within a majority of the cells is between from about 2 pounds per cubic foot to about 20 pounds per cubic foot and the density of the integral foam skin is between from about 20 pounds per cubic foot to about 80 pounds per cubic foot.
CROSS REFERENCE TO RELATED APPLICATION
This is a division of application Ser. No. 661,907, filed Feb. 26, 1976, and now U.S. Pat. No. 4,088,723.
This application is a continuation-in-part of Ser. No. 500,966, filed Aug. 26, 1974, now abandoned.
US Referenced Citations (15)
Divisions (1)
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Number |
Date |
Country |
Parent |
661907 |
Feb 1976 |
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