FIELD: packing industry.
SUBSTANCE: cast plastic cover comprises an upper wall and a circular skirt protruding from the specified upper wall and comprising inner thread. At the same time the skirt forms a row of alternate grooves and ledges that are distanced along the circumference, which altogether form multiple stiffening ribs that are distanced at the circumference on the inner surface of the specified skirt. At the same time grooves that are distanced along the circumference pass below the inner thread and are spaced from it. Besides, each of the specified grooves has a size along circumference that exceeds the size along the circumference of every specified ledge. The cover skirt forms multiple notches for gripping on its outer surface that are spaced along the circumference. Besides, the specified notches for gripping are accordingly combined with grooves spaced along the circumference formed on the inner surface of the specified skirt.
EFFECT: invention provides for development of a cover that has higher strength at longitudinal bend.
7 cl, 3 dwg
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