Patent ID: 7726162

Claim:
A method of reshaping a skirt ( 12 ) of a hollow metallic container ( 1 , 6 ) to form a shaped metallic container ( 1 ′, 6 ′), the hollow metallic container ( 1 , 6 ) having a top end ( 10 ) with an opening ( 11 ), and a bottom end ( 14 ), the method comprising the steps of: placing said container ( 1 , 6 ) in a two halves mould ( 2 ) having an internal shaped wall ( 21 ); building an internal pressure P of a first fluid during a span of time Δt within said hollow container to form a cavity ( 15 ) and to expand said skirt ( 12 ) against said shaped wall ( 21 ) such that said skirt is shaped by said shaped wall, said shaped wall ( 21 ) having an internal surface ( 210 ) defining a lateral space ( 211 ); and during said building step, applying an external pressure P′ of a second fluid in any of i) an upper space ( 101 ) contiguous to an external surface ( 100 ) of said top end ( 10 ) and ii) a lower space ( 141 ) contiguous to an external surface ( 140 ) of said bottom end ( 14 ), so as to have, during said span of time Δt, a pressure difference ΔP =|P−′| wherein a distortion of a shape of said top end ( 10 ) and/or a shape of said bottom end ( 14 ) is prevented as said first pressurized fluid acts upon said skirt ( 12 ).