kahe paralleelse, servapidi kokkukeevitatud plekist toorikutest mahutite lehtvormimine samaaegselt ülemisse ja alumisse vormiõõnde vedeliku surve tekitamisega toorikutevahelises vahemikus, forming complex sheet metal containers using pressurized fluid injected between the sheets welded around their periphery (or clamped between upper and lower die), simultaneously forming both upper and lower side profile