Food can and method for producing said can

摘要

The invention refers to packages for keeping food stuffs and may be used for producing small-sized packages (mainly for water, beer and other drinks) of a combined type of a polyethylentereftalat (PET)-jar with a metal lid. The jar for keeping food stuffs contains a vessel formed in the process of blowing up with the body part and the neck part, both made from polyethylentereftalat in one piece. There is a fitting girdle for an air-tight fitting of a metal lid with a valve for drinking in the top part of the jar neck. The fitting girdle has a Ã-shaped cross section and forms a flange with a projecting edge for air-tight fastening with the lid. The said lid has a C-shaped side edge for free putting it on the Ã-shaped side edge of the fitting girdle with the ability of their folding together and forming a five-fold air-tight package due to their plasticity while the outer diameters of the fitting girdle on the neck of the jar and of the lid make no less than 2/3 of the max. width of the casing in the middle part of the jar. A method of producing the jar from polyethylentereftalat presumes a jar casing production from a preliminary made cored finger-shaped half-finished product-preform with a neck for blowing air into it with further blowing up the said half-finished product into a press-form of a given configuration, thereafter a half-finished product being formed, the bottom part of the said product being made in the shape of a given jar and the top part before the neck having a stepped form with a projecting ring rib and an inner groove. Thereafter a ring cut along the side edge of the rib is made with forming a Ã-shaped fitting girdle. After filling the jar a metal lid is fastened to the said fitting girdle. Before cutting off the upper part of the half-finished product of the jar an aligning sizing head is put into the neck of the product, the top of the product being fixed against the cutting tool. The lid having a C-shaped edge is put on the Ã-shaped fitting girdle and the said unit is further reduced in its diameter from the lower and the upper sides thus forming a five-fold air-tight package.