SEALED PACKAGE FOR BULK AND FLUID MATERIALS Russian patent published in 1994 - IPC

FIELD: package for keeping bulk and fluid materials. SUBSTANCE: package has a body provided with a narrow neck and beading and incorporates a cover made from a polymeric material and formed as a hood with a bead extending along the edge of its inner side. The hood has also an annular flange with an inner groove which makes an arc in its cross section. The mentioned neck has a tore beading. The groove ensures that the flange interacts with the beading and gives the latter a reduction. The groove is disposed so as to divide the bottom part of the flange into inner and outer annular members. The cover bead is arranged so that it can interact with the body beading. To secure a reliable sealing the outer member of the flange has its inner surface formed by a cylindrical section and a conic one disposed in succession. The first section is conjugated with the groove surface on the arc within the angle of - . The second conic section is followed by an outer surface of the member. The inner annular member of the flange has an inner surface which is conic and conjugated with that of the groove at an arc portion within O°- angle and also with the outer surface of the member. The groove is disposed in the flange at a distance of at least 2 R of the groove from the cover bottom. EFFECT: improved tightness and higher durability of package. 1 dwg