Abstract: Bottom (1) to a container, box, basket, barrel, cask or the like (8) made of a polymeric material and preferably produced by injection moulding. Material thickening and essentially scalloped, jagged and/or wave-like elevations (5) constitute an integrated part of the upper (3) and/or lower (4) surface of the bottom (1). The height (FIG. 12, A-B) of the elevations (5) is 0.5-20 mm representing at least 20% of the maximum thickness of the bottom (1). Intervening spaces (6) are formed between the material thickening elevations (5). A container (8) including a bottom (1) is produced by injection moulding and is cooled in the mould in such a way that the elevations (5) hold a core temperature exceeding the surface temperature to such an extent that the core shrinkage is larger than the surface shrinkage. A strong inner tensile stress is obtained, whereby the elevations (5) work as pretensioned reinforcing bars.

Abstract: Storage container, preferably a storage tray (1) of plastic having detachable partition walls (2), the container being provided with opposite vertical recesses or pairs of vertical ledges (5) along the inner side of the two long sides (3, 4). The container (1) comprises an inwards directed horizontal ledge (6) at the top along the inner side of each of the two long sides (3, 4), locking means (7) arranged in the upper edge of the ledges (6) on the two long sides (3, 4) of the container (1) in connection with each recess or pair of ledges (5), partition walls (2) including a lower part (8) and an upper part (9) connected to each other by an integrated hinge (10), whereby the parts (8, 9 and 10) are made of plastic in one piece, the upper part (9) being provided with locking means (11) along each short side which locking means (1 1) arc intended to co-operate with the locking means (7) on the container (1).