Method for dry-forming a cellulose bottle, cellulose bottle forming unit and cellulose bottle

A bottle forming unit for dry-forming at least a part of a cellulose bottle from an air-formed cellulose blank structure, wherein the bottle forming unit comprises a feeding unit, a shaping unit and a first forming mould,

• wherein the shaping unit is configured for shaping the dry-formed cellulose blank structure into a shaped cellulose blank structure having a tube-like configuration with an inner surface and an outer surface,
• wherein the feeding unit is configured for feeding the shaped cellulose blank structure to the first forming mould, wherein the first forming mould is configured for forming a neck portion of a leading cellulose bottle simultaneously with forming a semi-closed bottom portion of a directly following trailing cellulose bottle from the shaped cellulose blank structure,
• wherein the bottle forming unit further comprises a second forming mould, wherein the feeding unit is configured for feeding the formed semi-closed bottom portion and an intermediate section of the shaped cellulose blank structure between the formed semi-closed bottom portion and a directly following formed trailing neck portion to the second forming mould, wherein the second forming mould is configured for forming a mid-portion from the intermediate section and forming a closed bottom portion from the semi-closed bottom portion,
• wherein the second forming mould comprises openable and closable second mould parts forming a second forming cavity, wherein a flexible membrane connected to and arranged in fluid communication with a pressure lance is arranged in the second forming cavity, wherein the feeding unit is configured for feeding the semi-closed bottom portion and the intermediate section around the pressure lance into the second forming mould when the first mould parts and the second mould parts are open,
• wherein the second mould parts together with the flexible membrane, when the second mould parts are closed around the semi-closed bottom portion and the intermediate section, are configured for forming the closed bottom portion and the mid-portion by inflating the flexible membrane with a pressure medium entering from the pressure lance, wherein the semi-closed bottom portion and the intermediate section are pressed against the second mould parts by means of the inflated flexible membrane.