PLASTIC BOTTLE AND MOLD FOR BOTTLE BOTTOM FORMING Russian patent published in 2005 - IPC

FIELD: packing equipment, particularly blow-molded plastic bottles with improved bottom structures.

SUBSTANCE: polymeric bottles made of biaxially-oriented polymer, for instance of polyethylene terephthalate is formed by blowing heated bottle blank in mould under heating temperature and time control performed for blank zones defined along height thereof. This allows change of bottle wall thickness along the full bottle height and provides necessary strength in different bottle parts. Bottle bottom is composed of two intersecting spheres, wherein line of sphere intersection formed as ring defines plane of bottle contact with horizontal surface. The ring is created during bottle bottom expansion. To expand bottle annular groove with predetermined height and width is made in lower mould part. Upper groove edge is offset from mould center.

EFFECT: increased strength, stability of the bottle, possibility to create bottle adapted to store beer and heavily carbonated drinks.

6 cl, 6 dwg