| 摘要 |
A molded insulating insert of expanded polystyrene has a central section and hingedly connected side sections which are bendable toward each other to bring the insert to a U-shaped configuration for insertion in a building block cavity. The hinges are formed to provide resistance to full ninety degree bending of the side sections so that the insert side sections are inclined slightly outwardly in a free condition. On flexing inwardly and insertion in a block cavity the side sections tend to spring outwardly and frictionally grip the walls of the cavity. Lug-notch connection means frictionally retain the inserts in the U-shaped configuration and prevent dislodgement of sections in the event of hinge rupture. In molding the inserts, a transfer process is employed with the hinges partially formed in a hot mold and thereafter fully formed in a cold mold. The polystyrene is compressed in the hinge area to a higher density for hinge integrity. Density in the hinge area is approximately doubled. Reflective foil is also applied to the inner surfaces of the side sections.
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