FIELD: plastic processing.
SUBSTANCE: invention relates to a preform. Preform is made of plastic material for the manufacture of hollow bodies through a blow moulding process. Preform comprises a substantially cylindrical body having an open end and a closed end. Closed end has a varying-curvature outer surface which is entirely enveloped within a hemispherical surface having a radius equal to outer radius (R) of the cylindrical body of the preform. Varying-curvature outer surface is tangent to the hemispherical surface in which it is enveloped in correspondence of circular crown C and of the preform vertex.
EFFECT: providing a new-concept, lighter preform which allows to achieve the desired weight reduction in the central area of the bottom of the bottle obtained therefrom and which may be used also in the reconversion of existing plants for the production of traditional hemispherical closed-end preforms with reduced costs for modifying the moulds of the moulding machines meant for the production thereof.
12 cl, 3 dwg
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