FIELD: process engineering.
SUBSTANCE: invention relates to construction materials, particularly, to sandwiched carbonate sheets. Extruded polycarbonate sandwiched sheet structure comprises at least two, or seven or more, in fact parallel spaced apart walls and multiple ribs extending over sheet length in direction of extrusion to separate adjacent walls. Said sheet structure features total height over 40 mm while polycarbonate has melt viscosity factor over 4.5 measured at 260°C making the ratio between viscosity at shear ratio of 0.1 c-1 and that at 100 c-1.
EFFECT: increased transparency, better insulation properties, higher strength.
11 cl, 7 dwg, 1 tbl
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