Twin sheet thermoformed structure and method of making same.

摘要

In producing a twin sheet thermoformed structure, a mold is provided with major rib producing structures segregrated into discrete tabs with gaps between tabs. A first sheet of material is fused upon itself by drawing the material into the gaps (30) between tabs (28) from both sides of the gap. The material drawn into the gaps fuses upon contact with material being drawn into the gap from the other side forming a cross rib which tends to stabilize the side walls of the major rib. The first sheet is then fused to a second sheet of material to create a twin sheet structure.