FIELD: textiles; paper.
SUBSTANCE: corrugated cardboard tray contains the upper sheet (28), (28), base sheet (29) and at least one connective element (30, 31, 32, 35, 38) between the specified upper sheet (28) and base sheet (29). The connective element (30, 31, 32, 35, 38) may be removed to transform the tray between relatively flat and relatively straightened shapes. Each connective element (30, 31, 32, 35, 38) is made from a workpiece containing two basically parallel opposite mail body panels, two pairs of opposite side walls, middle panel between the main body panels and two end valve at the end of each main body panel. Each end valve has basically the same length as the middle panel. Each of one pair of opposite side walls is formed at least from two closing one onto the other parts to let each element change the condition from oblate or mounted into the straightened condition.
EFFECT: improvement of construction and increase of maintainability of corrugated cardboard trays.
23 cl, 9 dwg
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