Method for dry-forming a cellulose bottle, cellulose bottle forming unit and cellulose bottle
A bottle forming unit and method for dry-forming a cellulose bottle from an air-formed cellulose blank structure in a bottle forming unit. The dry-formed cellulose bottle comprises a neck portion, a closed bottom portion, and a mid-portion arranged between the closed bottom portion and the neck portion. The mid-portion is arranged in fluid communication with the neck portion. The dry-formed cellulose blank structure is shaped into a shaped cellulose blank structure, where the shaped cellulose blank structure has a tube-like configuration with an inner surface and an outer surface. A first section of the shaped cellulose blank structure is fed to a first forming mould and a semi-closed bottom portion of the cellulose bottle is formed from the first section in the first forming mould, simultaneously with forming the neck portion of a directly preceding cellulose bottle from the first section in the first forming mould. A following second section of the shaped cellulose blank structure is fed to the first forming mould and the neck portion of the cellulose bottle is formed from the second section in the first forming mould, simultaneously with forming a semi-closed bottom portion of a directly following cellulose bottle from the second section in the first forming mould.
1 . 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 first forming mould comprises openable and closable first mould parts arranged around a pressure lance, wherein a first forming cavity is formed between the first mould parts and the pressure lance, wherein the feeding unit is configured for feeding the shaped cellulose blank structure around the pressure lance and through the first mould parts when the first mould parts are open, wherein the first mould parts when closed are configured for pressing the shaped cellulose blank structure against the pressure lance for simultaneously forming the neck portion and the semi-closed bottom portion in the first forming cavity.
2 . The bottle forming unit according to claim 1 ,
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.
3 . The bottle forming unit according to claim 2 ,
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 the 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.
4 . The bottle forming unit according to claim 3 ,
wherein the pressure lance is extending to or partly into the second forming cavity.
5 . The bottle forming unit according to claim 3 ,
wherein the bottle forming unit comprises a fluid control device, wherein the pressure lance at a first end is arranged in fluid communication with the fluid control device, and wherein the pressure lance at a second end is arranged in fluid communication with the flexible membrane, wherein the fluid control device is configured for inflating the flexible membrane with the pressure medium via the pressure lance.
6 . The bottle forming unit according to claim 3 ,
wherein the bottle forming unit further comprises a cutting device arranged in the second mould parts or in connection to the second mould parts, wherein the cutting device is configured for cutting off the formed neck portion of a leading cellulose bottle from the semi-closed bottom portion of the directly following trailing cellulose bottle by means of the cutting device during the forming of the cellulose bottle in the second forming mould.
7 . The bottle forming unit according to claim 1 ,
wherein the first forming mould comprises a thread forming section configured for forming a threaded section of the neck portion upon forming of the neck portion in the first forming mould.
8 . 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.