SE2350710A1

SE2350710A1 - Method for dry-forming a cellulose bottle, cellulose bottle forming unit and cellulose bottle

Info

Publication number: SE2350710A1
Application number: SE2350710A
Authority: SE
Inventors: Ove Larsson
Original assignee: Pulpac AB
Priority date: 2022-09-27
Filing date: 2023-06-12
Publication date: 2024-03-28

Abstract

ABSTRACT A bottle forming unit and method for dry-forming at least a part of a cellulose bottle from an air-formed cellulose blank structure in a bottle forming unit. The dry-formed cellulose blank structure is shaped into a shaped cellulose blank structure in a shaping unit comprising a forming shoulder, where the shaped cellulose blank structure has a tube-like configuration with an inner surface and an outer surface.

Description

METHOD FOR DRY-FORMING A CELLULOSE BOTTLE, CELLULOSE BOTTLE FOR|\/IING UNIT AND CELLULOSE BOTTLE TECHNICAL FIELD The present disclosure relates to a method for dry-forming at least a part of a cellulose bottle from an air-formed cellulose blank structure in a bottle forming unit. The disclosure further relates to a bottle forming unit for dry-forming at least a part of a cellulose bottle from an air-formed cellulose blank structure and a dry-formed cellulose bottle.

BACKGROUND Cellulose fibres are commonly used as raw material for producing or manufacturing cellulose products. Products formed of cellulose fibres can be used in many different situations where there is a need for sustainable products. A wide range of products can be produced from cellulose fibres and one specific product category relates to cellulose bottles.

Bottle forming units are used when manufacturing cellulose bottles from raw materials including cellulose fibres, and traditionally cellulose products have been produced by wet-forming methods. A material commonly used for wet-forming cellulose fibre products, such as cellulose bottles is wet moulded pulp. Wet-formed products are generally formed by immersing a suction forming mould into a liquid or semi liquid pulp suspension or slurry comprising cellulose fibres, and when suction is applied, a body of pulp is formed with the shape of the desired product by fibre deposition onto the forming mould. With all wet-forming methods, there is a need for drying of the wet moulded product, where the drying process is a time and energy consuming part of the production. The demands on aesthetical, chemical and mechanical properties of cellulose products are increasing, and due to the properties of wet-formed cellulose products, the mechanical strength, flexibility, freedom in material thickness, and chemical properties are limited. lt is also difficult in wet-forming processes to control the mechanical properties of the products with high precision.

One development in the field of producing cellulose products, such as cellulose bottles, is dry-forming of cellulose products without using wet-forming methods. lnstead of forming the cellulose products from a liquid or semi liquid pulp suspension or slurry, an air-formed cellulose blank structure is used. The air-formed cellulose blank structure is inserted into a forming mould and during the dry-forming of the cellulose products, the cellulose blank is subjected to a high forming pressure and a high forming temperature. One difficulty with bottle dry-forming methods is the problem with an efficient production process, where cellulose bottles with high quality can be produced at high speeds. The handling of the air-formed cellulose blank structure is a complicated and time-consuming process when dry-forming the cellulose bottles, and there is a need for producing bottles with high finish at increased production rates, and thus a more efficient bottle forming unit and method for producing high-quality cellulose bottles is desired.

SUMMARY An object of the present disclosure is to provide a method for dry-forming a cellulose at least a part of a bottle and ultimately a complete bottle, a cellulose bottle forming unit for dry-forming a cellulose at least a part of a bottle and ultimately a complete bottle, and at least a part of a dry-formed cellulose bottle and ultimately a cellulose bottle, where the previously mentioned problems are avoided. This object is at least partly achieved by the features of the independent claims. The dependent claims contain further developments of the method, the forming unit, and the dry-formed at least part of the cellulose bottle and ultimately a dry-formed cellulose bottle.

The disclosure concerns a method for dry-forming at least a part of a cellulose bottle from an air-formed cellulose blank structure in a bottle forming unit, wherein the method comprises the steps: shaping the dry-formed cellulose blank structure in a shaping unit into a shaped cellulose blank structure, wherein the shaped cellulose blank structure has a tube-like configuration with an inner surface and an outer surface; wherein the step of shaping the dry-formed cellulose blank structure into a shaped cellulose blank structure comprises the step of feeding the dry-formed cellulose blank structure to and over an upper surface of a forming shoulder of the shaping unit and then into a forming through channel of the forming shoulder and around a pressure lance extending through the forming through channel.

The shaping unit gives a smooth and highly efficient forming of the tube-like cellulose blank structure.

According to one example, the step of feeding the dry-formed cellulose blank structure to and over an upper surface of a forming shoulder and then into a forming through channel of the forming shoulder, comprises the step of feeding the cellulose blank structure over the upper surface perpendicular to through channel or at an angle to the through channel, dependent on type of cellulose fiber, thickness of the cellulose blank structure, degree of compaction of the cellulose blank structure, additional layers added to the cellulose blank structure.

According to one example, the step of feeding the dry-formed cellulose blank structure into the forming through channel of the forming shoulder and around the pressure lance extending through the forming through channel, comprises the step of folding the cellulose blank structure into an overlapping manner along an extension of the tube-like configuration with the inner surface overlapping the outer surface.

According to one example the at least a part of the dry-formed cellulose bottle comprises a neck portion, a semi-closed bottom portion, and a mid-portion arranged between the semi-closed bottom portion and the neck portion, wherein the mid-portion is arranged in fluid communication with the neck portion, wherein the method comprises the steps: feeding a first section of the shaped cellulose blank structure to a first forming mould and forming the semi-closed bottom portion ofthe cellulose bottle 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; feeding a following second section of the shaped cellulose blank structure to the first forming mould and forming the neck portion of the cellulose bottle 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.

Advantages with these features are that the method is enabling an efficient production process, where cellulose bottles with high quality can be produced at high speeds.

The handling of the air-formed cellulose blank structure is simplified through use of the forming shoulder for shaping the cellulose blank structure into the tube-like configuration, and the first forming mould is used for efficiently producing at least part of a bottle with a neck portion having high finish and a semi-closed bottom prepared for closing in a second step, at increased production rates. ln this way, a more efficient bottle forming method for producing high-quality cellulose bottles is achieved. The simultaneous forming of the semi-closed bottom portion of the cellulose bottle and the neck portion of a directly preceding cellulose bottle according to the above and the below is providing a unique and fast forming operation.

The disclosure further concerns a 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 method comprises the steps: shaping the dry-formed cellulose blank structure 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; feeding a first section of the shaped cellulose blank structure to a first forming mould and forming a semi-closed bottom portion of the cellulose bottle 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; feeding a following second section of the shaped cellulose blank structure to the first forming mould and forming the neck portion of the cellulose bottle 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.

Advantages with these features are that the method is enabling an efficient production process, where cellulose bottles with high quality can be produced at high speeds. The handling of the air-formed cellulose blank structure is simplified through use of the shaped cellulose blank structure having the tube-like configuration, and the first forming mould is used for efficiently producing bottles with high finish at increased production rates. ln this way, a more efficient bottle forming method for producing high-quality cellulose bottles is achieved. The simultaneous forming of the semi- closed bottom portion of the cellulose bottle and the neck portion of a directly preceding cellulose bottle is providing a unique and fast forming operation. ln one embodiment, the first forming mould comprises openable and closable first mould parts arranged around a pressure lance. A first forming cavity is formed bet\Neen the first mould parts and the pressure lance. The forming of the semi-closed bottom portion of the cellulose bottle in the first forming mould further comprises the steps: opening the first mould parts; feeding the shaped cellulose blank structure around the pressure lance and through the first mould parts; stopping the feeding of the shaped cellulose blank structure when the first section of the shaped cellulose blank structure is arranged in a position aligned with the first mould parts; closing the first mould parts and pressing the first section against the pressure lance by means of the first mould parts for forming the semi-closed bottom portion of the cellulose bottle in the first forming cavity, and simultaneously forming the neck portion of the directly preceding cellulose bottle in the first forming cavity. ln this way, a section of the pressure lance is extending through the first forming cavity and forming part of the first forming mould. The section of the pressure lance extending through the first forming cavity is together with the first mould parts used for an efficient forming of the neck portion and the semi-closed bottom portion in the first forming cavity. During the pressing operation, a first forming pressure and a first forming temperature are suitably applied onto the shaped cellulose blank structure in the first forming cavity, for an efficient forming operation in the first forming mould. ln one embodiment, the forming of the neck portion of the cellulose bottle in the first forming mould further comprises the steps: opening the first mould parts; feeding the shaped cellulose blank structure around the pressure lance and through the first mould parts; stopping the feeding of the shaped cellulose blank structure when the second section of the shaped cellulose blank structure is arranged in a position aligned with the first mould parts; closing thefirst mould parts and pressing the second section against the pressure lance by means of the first mould parts for forming the neck portion of the cellulose bottle in the first forming cavity, and simultaneously forming the semi-closed bottom portion of the directly following cellulose bottle in the first forming cavity. The simultaneous forming of the semi-closed bottom portion of the cellulose bottle and the neck portion of a directly preceding cellulose bottle is providing a unique and fast forming operation, and in this way, the semi-closed bottom portion of the cellulose bottle is efficiently formed. ln one embodiment, the forming of the neck portion of the cellulose bottle in the first forming mould further comprises the steps: applying the first forming pressure and the first forming temperature onto a part of the second section of the shaped cellulose blank structure for forming a structurally rigid neck portion. ln this way, the neck portion of the cellulose bottle is efficiently formed with a rigid structure for high structural strength and durability through the application of the first forming pressure and the first forming temperature onto the part of the second section used for forming the neck portion. ln one embodiment, the method further comprises the steps: feeding the formed semi- closed bottom portion of the cellulose bottle and an intermediate section ofthe shaped cellulose blank structure between the formed semi-closed bottom portion of the cellulose bottle and the formed neck portion of the cellulose bottle to a second forming mould; forming the mid-portion of the cellulose bottle from the intermediate section and forming the closed bottom portion of the cellulose bottle from the semi-closed bottom portion in the second forming mould. The second forming mould is in this way used for an efficient forming of the mid-portion of the cellulose bottle from the intermediate section and forming the closed bottom portion of the cellulose bottle from the semi-closed bottom portion after the forming operations in the first forming mould. ln one embodiment, the second forming mould comprises openable and closable second mould parts forming a second forming cavity. A flexible membrane connected to and arranged in fluid communication with the pressure lance is arranged in the second forming cavity. The forming of the mid-portion and the closed bottom portion in the second forming mould further comprises the steps: opening the first mould parts and opening the second mould parts; feeding the semi-closed bottom portion and the intermediate section around the pressure lance into the second forming mould; stopping the feeding of the semi-closed bottom portion and the intermediate section when positioned between the open second mould parts; closing the second mould parts around the semi-closed bottom portion and the intermediate section and inflating the flexible membrane with a pressure medium entering from the pressure lance and applying a second forming pressure onto the semi-closed bottom portion and the intermediate section by pressing the semi-closed bottom portion and the intermediate section against the second mould parts by means of the inflated flexible membrane, and applying a second forming temperature onto the semi-closed bottom portion and the intermediate section, for forming the closed bottom portion and the mid-portion; deflating the flexible membrane and opening the second mould parts; removing the formed ce||u|ose bottle from the second forming mould. ln this way, the flexible membrane when inflated by the pressure medium is applying the second forming pressure onto the intermediate section and the semi-closed bottom portion. Further, the applied second forming pressure together with the applied second forming temperature onto the semi-closed bottom portion and the intermediate section are efficiently forming the closed bottom portion and the mid-portion of the ce||u|ose bottle. ln one embodiment, upon forming of the semi-closed bottom portion in the first forming mould, a collar section of the semi-closed bottom portion is established by forces acting on the shaped ce||u|ose blank structure. The method further comprises the step: pushing the semi-closed bottom portion towards a closed configuration upon closing the second mould parts of the second forming mould around the semi-closed bottom portion, wherein the collar opening of the semi-closed bottom portion is closed by the forces exerted by the second mould parts. The closed configuration ofthe semi- closed bottom portion is enabling an efficient forming of the ce||u|ose bottle, where the semi-closed bottom portion can be formed into the fully closed bottom portion in the second forming mould upon application of the second forming pressure and second forming temperature. ln one embodiment, the method further comprises the step: closing the first mould parts simultaneously with closing the second mould parts. The simultaneous closing is securing synchronized movements of the mould parts for an increased production speed. ln one embodiment, the bottle forming unit further comprises a cutting device arranged in the second mould part or in connection to the second mould part. The method further comprises the step: cutting off the formed neck portion of the ce||u|ose bottle from the semi-closed bottom portion of the directly following ce||u|ose bottle by means of the cutting device during the forming of the ce||u|ose bottle in the second forming mould. The cutting device may be arranged with cutting edges on the outer second mould part and the inner second mould part respectively for an efficient cutting operation, Where the cutting edges are cutting off the formed neck portion of the cellulose bottle from the semi-closed bottom portion of the directly following cellulose bottle upon closing of the second forming mould. According to one example embodiment, where the pressure lance extends into the second forming mould, the cutting device may be arranged to work against and around the pressure lance such that the pressure lance acts as an anvil against which the cutting edges are pressed for separating the neck portion from the semi-closed bottom portion. Here, the pressure lance may comprise a reinforced portion that can withstand the pressure from the cutting edges. The reinforced portion can be arranged as a thicker material portion of the pressure lance and/or can be made from a different material than adjacent pressure lance portions. As an alternative, the entire pressure lance is made from a suitable material than can withstand pressure both in the first forming mould and the second forming mould. ln one embodiment, the first forming mould comprises a thread forming section. The method further comprises the step: forming a threaded section of the neck portion upon forming of the neck portion in the first forming mould by means of the thread forming section. The thread forming section comprises a threaded pattern enabling efficient forming of the threaded section of the neck portion in the first forming mould. ln one embodiment, the directly preceding cellulose bottle is a leading cellulose bottle to the dry-formed cellulose bottle, and the directly following cellulose bottle is a trailing cellulose bottle to the dry-formed cellulose bottle.

The disclosure further concerns 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 pressure lance, 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 shaping unit comprises a forming shoulder comprising an upper surface and a forming through channel, wherein the forming shoulder comprises a transition portion between the upper surface and the through channel, wherein the shaping unit is configured to guide the cellulose blank structure when fed to the forming unit over the upper surface then into the transition portion and then into the forming through channel and around the pressure lance extending through the forming through channeL The shaping unit gives a smooth and highly efficient forming of the tube-like cellulose blank structure.

According to one example, the shaping unit is configured to allow the guiding of the cellulose blank structure over the upper surface perpendicular to through channel or at an angle to the through channel, dependent on type of cellulose fiber, thickness of the cellulose blank structure, degree of compaction of the cellulose blank structure, additional layers added to the cellulose blank structure.

According to one example, the forming through channel comprises an open and overlapping portion extending in the feeding direction of the cellulose blank structure, wherein the overlapping portion is configured to guide the cellulose blank structure into a folded and overlapping manner along an extension ofthe tube-like configuration with the inner surface overlaps the outer surface when the cellulose blank structure is fed and guided into and through the forming through channel and around the pressure lance extending through the forming through channel.

According to one example, the at least a part of the dry-formed cellulose bottle comprises a neck portion, a semi-closed bottom portion, and a mid-portion arranged between the semi-closed bottom portion and the neck portion, wherein the mid-portion is arranged in fluid communication with the neck portion, wherein the bottle forming unit comprises a first forming mould, wherein the feeding unit is configured forfeeding 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.

Advantages with these features are that the bottle forming unit is enabling an efficient cellulose bottle production process, where cellulose bottles with high quality can be produced at high speeds. The handling of the air-formed cellulose blank structure is simplified through use ofthe forming shoulderfor shaping the cellulose blank structure into the tube-like configuration, and the first forming mould is used for efficiently producing bottles with high finish at increased production rates. ln this way, a more efficient bottle forming unit for producing high-quality at least part of a bottle with a neck portion having high finish and a semi-closed bottom prepared for closing in a second step, at increased production rates. The simultaneous forming of the semi- closed bottom portion of the cellulose and the neck portion of a directly preceding cellulose bottle according to the above and the below is providing a unique and fast forming operation.

The disclosure further concerns a bottle forming unit for dry-forming a cellulose bottle from an air-formed cellulose blank structure. 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 bottle forming unit comprises a feeding unit, a shaping unit and a first forming mould. 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. The feeding unit is configured for feeding the shaped cellulose blank structure to the first forming mould. 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.

Advantages with these features are that the bottle forming unit is enabling an efficient cellulose bottle production process, where cellulose bottles with high quality can be produced at high speeds. The handling of the air-formed cellulose blank structure is simplified through use of the shaped cellulose blank structure having the tube-like configuration, and the first forming mould is used for efficiently producing bottles with high finish at increased production rates. ln this way, a more efficient bottle forming unit for producing high-quality cellulose bottles is achieved. The simultaneous forming of the semi-closed bottom portion of the cellulose and the neck portion of a directly preceding cellulose bottle from is providing a unique and fast forming operation. 11 ln one embodiment, the first forming mould comprises openable and closable first mould parts arranged around a pressure lance. A first forming cavity is formed between the first mould parts and the pressure lance, and the feeding unit is configured forfeeding the shaped cellulose blank structure around the pressure lance and through the first mould parts when the first mould parts are open. The first mould parts are when closed 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. ln this way, a section of the pressure lance extending through the first forming cavity is forming part of the first forming mould, and the section of the pressure lance is used for an efficient forming of the neck portion and the semi-closed bottom portion in the first forming cavity. During the pressing operation, a first forming pressure and a first forming temperature are applied onto a part of the shaped cellulose blank structure used for forming the neck portion in the first forming cavity, for an efficient forming operation in the first forming mould. ln one embodiment, the bottle forming unit further comprises a second forming mould. The feeding unit is configured for feeding a formed semi-closed bottom portion and an intermediate section of the shaped cellulose blank structure bet\Neen the formed semi-closed bottom portion and a directly following formed trailing neck portion to the second forming mould. The second forming mould is configured for forming the mid- portion from the intermediate section and forming the closed bottom portion from the semi-closed bottom portion. The second forming mould is in this way used for an efficient forming of the mid-portion of the cellulose bottle from the intermediate section and forming the closed bottom portion of the cellulose bottle from the semi-closed bottom portion after the forming operations in the first forming mould ln one embodiment, the second forming mould comprises openable and closable second mould parts forming a second forming cavity. A flexible membrane connected to and arranged in fluid communication with the pressure lance is arranged in the second forming cavity. 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. 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 12 the flexible membrane with a pressure medium entering from the pressure lance, where the semi-closed bottom portion and the intermediate section are pressed against the second mould parts by means of the inflated flexible membrane. ln this way, the flexible membrane when inflated by the pressure medium is applying a second forming pressure onto the intermediate section and the semi-closed bottom portion. Further, the applied second forming pressure together with an applied second forming temperature onto the semi-closed bottom portion and the intermediate section are efficiently forming the closed bottom portion and the mid-portion of the cellulose bottle. ln one embodiment, the pressure lance is extending to or partly into the second forming cavity. The pressure lance is With these configurations efficiently providing the pressure medium to the flexible membrane arranged within the second forming cavity for inflating or deflating the flexible membrane in the forming operation process. ln one embodiment, the bottle forming unit comprises a fluid control device. The pressure lance is at a first end arranged in fluid communication with the fluid control device, and the pressure lance is at a second end arranged in fluid communication with the flexible membrane. The fluid control device is configured for inflating the flexible membrane with the pressure medium via the pressure lance upon forming the cellulose bottles in the second forming mould. The fluid control device is further arranged for deflating the flexible membrane via the pressure lance after the forming operation in the second forming mould. Thefluid control device may have any suitable configuration, and may comprise hydraulic or pneumatic cylinders, fluid pumps, compressors, or other pressure establishing devices for delivering pressurized pressure medium to the flexible membrane via the pressure lance. ln one embodiment, the bottle forming unit further comprises a cutting device arranged in the second mould part or in connection to the second mould part. The cutting device is configured for cutting off the formed neck portion of a leading cellulose bottle from the semi-closed bottom portion of a directly following trailing cellulose bottle by means of the cutting device during the forming of the cellulose bottle in the second forming mould. The cutting device may be arranged with cutting edges on the outer second mould part and the inner second mould part respectively for an efficient cutting operation, where the cutting edges are cutting off the formed 13 neck portion of the leading cellulose bottle from the semi-closed bottom portion of the directly following trailing cellulose bottle upon closing of the second forming mould. ln one embodiment, the first forming mould comprises a thread forming section configured forforming a threaded section of the neck portion upon forming of the neck portion in the first forming mould. The thread forming section comprises a threaded pattern for efficient forming of the threaded section of the neck portion in the first forming mould.

The disclosure further concerns a dry-formed cellulose bottle. The cellulose bottle has an extension in a longitudinal direction and comprises a neck portion, a closed bottom portion, and a mid-portion arranged in the longitudinal direction between the closed bottom portion and the neck portion. The mid-portion is arranged in fluid communication with the neck portion, and the cellulose bottle comprises a compressed seam section. The seam section is extending along the cellulose bottle through the neck portion, the mid-portion, and the closed bottom portion. The seam section is resulting from an overlapping tube-like configuration of the shaped cellulose blank structure when arranged in the forming moulds. The overlapping tube-like configuration is securing that the shaped cellulose blank structure is formed without any gaps or open passages in the feeding direction. The seam section is providing a rigid structural part of the cellulose bottle, and With the overlapping configuration resulting in the seam section the cellulose bottle can be formed without any residual parts of the cellulose blank structure after forming the cellulose bottle in the forming moulds. ln one embodiment, the seam section is extending in the longitudinal direction of the cellulose bottle, or extending essentially in the longitudinal direction of the cellulose bottle. The extension of the seam section is mainly determined by the overlapping tube-like configuration of the shaped cellulose blank structure, and the extension along the cellulose bottle is providing a rigid structural part along the length of the cellulose bottle. ln one embodiment, the seam section of the neck portion has a higher basis weight compared to at least adjacent parts of the neck portion outside the seam section, the seam section of the mid-portion has a higher basis weight compared to at least adjacent parts of the mid-portion outside the seam section, wherein the seam section 14 of the closed bottom portion has a higher basis weight compared to at least adjacent parts of the closed bottom portion outside the seam section. The higher basis weight is resulting from the accumulation of material in the overlapping tube-like configuration of the shaped cellulose blank structure, and the higher basis weight is used for providing the rigid structural part of the cellulose bottle formed by the seam section. ln one embodiment, the neck portion comprises a smooth inner surface and an outer surface arranged with a threaded section. The smooth inner surface is securing a surface structure suitable for preventing bacterial growth and for adding barrier structures, such as plastic films or additives. The threaded section is enabling use of caps for closing the cellulose bottle. ln one embodiment, the cellulose bottle comprises a shaped air-formed cellulose blank structure. ln one embodiment, the closed bottom portion comprises a centrally arranged closed collar section of compressed cellulose fibres. The centrally closed collar section is resulting from the forming process and is providing a rigid bottom structure of the cellulose bottle. ln one embodiment, the closed collar section is positioned at a distance above one or more lowest parts of the closed bottom portion in the longitudinal direction. With this configuration, the one or more lowest parts of the cellulose bottle can be used for providing a stable bottom structure of the cellulose bottle, where the bottom structure suitably has an inwardly curved surface configuration. The cellulose bottle has with this construction a high stability when placed on an object surface, such as for example a table surface or other surface. ln one embodiment, the neck portion has a higher average basis weight compared to the mid-portion, and the closed bottom portion has a higher average basis weight compared to the mid-portion. This configuration is providing high rigidity in the neck portion and the closed bottom portion. The higher average basis weight results from a higher amount of fibres per unit area in a certain section of the cellulose bottle compared to another comparable section of the cellulose bottle. ln the example embodiment where the cellulose blank structure has the same width and thickness when formed into the tube-like configuration and fed to the first and second forming moulds, and the neck portion has a smaller diameter than the mid-portion, then the same amount fibres are packed into a smaller unit area in the neck portion than in a comparable section of the mid-portion.

BRIEF DESCRIPTION OF DRAWINGS The disclosure will be described in detail in the following, with reference to the attached drawings, in which Fig.

Fig.

Fig. 1 2a-f 3a-e 4a-e 5a-f shows schematically, in a perspective view, a bottle forming unit with a first forming mould and a second forming mould, show schematically, in a perspective view from above and a perspective view from below, a cellulose bottle formed in the bottle forming unit; and in side views and in a perspective view, a shaped cellulose blank structure in different forming steps, show schematically, in perspective views from above, the first forming mould in different operational steps, show schematically, in side views, the second forming mould in different operational steps, show schematically, in perspective views, the bottle forming unit with the first forming mould and the second forming mould in different operational steps, shows schematically in a perspective view a transporting unit for transportation of formed cellulose bottles away from the second forming mould, and shows schematically, in a perspective view from below, a cellulose bottle comprising a seam section formed in the bottle forming unit. shows schematically, in a perspective view from above and side, a forming shoulder with a cellulose blank structure, shows schematically, in a perspective view from below and side, a forming shoulder with a cellulose blank structure, Fig.

Fig.

Fig. 11 12 13 14 16 17 16 shows schematically, in a perspective view from above and side, a forming shoulder with a cellulose blank structure, shows schematically, in a perspective view from below and side, a forming shoulder with a cellulose blank structure, shows schematically, in a perspective view from above and side, a forming shoulder, shows schematically, in a perspective view from below and side, a forming shoulder, shows schematically, in a perspective view from above and side, a forming shoulder with a cellulose blank structure, a pressure lance with a flexible membrane attached on one end and a second forming mould in an open state, shows schematically, a side view in cross-section of the second forming mould in an open state with a moveable pressure lance and a moveable bottom portion, shows schematically, the side view in figure 15 in a closed state with a cellulose web structure and expanded flexible membrane, and shows schematically a shaping unit comprising a forming shoulder configured to allow the guiding of the cellulose blank structure along and over an upper surface of the forming shoulder, where the upper surface is arranged at an angle to a through channel.

DESCRIPTION OF EXA|\/IPLE E|\/|BOD||\/IENTS Various aspects of the disclosure will hereinafter be described in conjunction with the appended drawings to illustrate and not to limit the disclosure, wherein like designations denote like elements, and variations of the described aspects are not restricted to the specifically shown embodiments, but are applicable on other variations of the disclosure. 17 Figure 1 schematically shows a bottle forming unit U for dry-forming a cellulose bottle 1 from an air-formed cellulose blank structure 2. The bottle forming unit U comprises a feeding unit F, a shaping unit S, a first forming mould M1, and a second forming mould M2. The bottle forming unit U is arranged for dry-forming the cellulose bottle 1 from the cellulose blank structure 2 in different operational steps in the first forming mould M1 and the second forming mould M2 for an efficient bottle forming process. ln the embodiment illustrated in figure 1, the first forming mould M1 is positioned above the second forming mould M2, and the first forming mould M1 is in this way arranged upstream the second forming mould M2. lt should however be understood that the bottle forming unit U in other non-illustrated embodiments may be positioned in other ways, where the first forming mould M1 is arranged upstream the second forming mould I\/|2.

With an air-formed cellulose blank structure 2 is meant an essentially air-formed fibrous web structure produced from cellulose fibres. The cellulose fibres may originate from a suitable cellulose raw material, such as a pulp material. Suitable pulp materials are for example fluff pulp, paper structures, or other cellulose fibre- containing structures. With air-forming of the cellulose blank structure 2 is meant the formation of a cellulose blank structure in a dry-forming process in Which the cellulose fibres are air-formed to produce the cellulose blank structure 2. When air-forming the cellulose blank structure 2 in the air-forming process, the cellulose fibres are carried and formed to the fibre blank structure 2 by air as carrying medium. This is different from a normal papermaking process or a traditional wet-forming process, where water is used as carrying medium for the cellulose fibres when forming the paper or fibre structure. ln the air-forming process, small amounts of water or other substances may if desired be added to the cellulose fibres in order to change the properties of the cellulose bottles, but air is still used as carrying medium in the forming process. The cellulose blank structure 2 may, if suitable have a dryness that is mainly corresponding to the ambient humidity in the atmosphere surrounding the air-formed cellulose blank structure 2. As an alternative, the dryness of the cellulose blank structure 2 can be controlled in order to have a suitable dryness level when forming the cellulose bottles 1.

The cellulose blank structure 2 may have a composition where the fibres are of the same origin or alternatively contain a mix of two or more types of cellulose fibres, 18 depending on the desired properties of the cellulose bottles 1. The cellulose fibres used in the cellulose blank structure 2 are during the forming process of the cellulose bottles 1 strongly bonded to each other with hydrogen bonds. The cellulose fibres may be mixed with other substances or compounds to a certain amount as will be further described below. With cellulose fibres is meant any type of cellulose fibres, such as natural cellulose fibres or manufactured cellulose fibres. The cellulose blank structure 2 may specifically comprise at least 95% cellulose fibres, or more specifically at least 99% cellulose fibres. However, the cellulose blank structure 2 may have other suitable configurations and cellulose fibre amounts.

The air-formed cellulose blank structure 2 may have a single-layer or a multi-layer configuration. A cellulose blank structure 2 having a single-layer configuration is referring to a structure that is formed of one layer containing cellulose fibres. A cellulose blank structure 2 having a multi-layer configuration is referring to a structure that is formed of t\No or more layers comprising cellulose fibres, where the layers may have the same or different compositions or configurations.

One or more reinforcement layers comprising cellulose fibres may be added to the cellulose blank structure 2. The one or more reinforcement layers may be arranged as carrying layers for the cellulose blank structure 2. The reinforcement layer may have a higher tensile strength than the cellulose blank structure 2. This is useful when one or more air-formed layers of the cellulose blank structure 2 have compositions with low tensile strength in order to avoid that the cellulose blank structure 2 will break during the forming of the cellulose bottles 1. The reinforcement layer with a higher tensile strength acts in this way as a supporting structure for the cellulose blank structure 2. The reinforcement layer may be of a different composition than the cellulose blank structure 2, such as for example a tissue layer containing cellulose fibres, an airlaid structure comprising cellulose fibres, or other suitable layer structures. lt is thus not necessary that the reinforcement layer is air-formed. The one or more reinforcement layers may be provided With graphical elements or patterns for enabling aesthetically attractive cellulose bottles 1.

The cellulose blank structure 2 may further comprise or be arranged in connection to one or more barrier layers giving the cellulose bottles 1 the ability to hold or withstand liquids, such as for example when the cellulose bottles 1 are used in contact with beverages, food, and other water-containing substances. The one or more barrier 19 layers may be of a different composition than the rest of the cellulose blank structure 2, such as for example a tissue barrier structure or a plastic film structure. The cellulose blank structure 2 may further comprise additives for achieving desired properties of the cellulose bottles 1. The one or more barrier layers may also be applied to the outside of the cellulose bottles 1, and the one or more barrier layers may be provided With graphical elements or patterns for enabling aesthetically attractive cellulose bottles 1.

The one or more air-formed layers of the cellulose blank structure 2 are fluffy and airy structures, where the cellulose fibres forming the structures are arranged relatively loosely in relation to each other. The fluffy cellulose blank structures 2 are used for an efficient forming of the cellulose bottles 1, allowing the cellulose fibres to form the cellulose bottles 1 in an efficient way during the forming process.

The shaping unit S is configured for shaping the dry-formed cellulose blank structure 2. This shaping of the cellulose blank structure 2 in the shaping unit S is enabling efficient transportation of the cellulose blank structure 2 and forming of the cellulose bottles 1 in the first forming mould M1 and the second forming mould M2. ln the shaping unit S, the cellulose blank structure 2 is shaped into a shaped cellulose blank structure 23 having a tube-like configuration with an inner surface 2a and an outer surface 2b. The cellulose blank structure 2 is provided to the bottle forming unit U in a flat shape, or essentially flat shape as understood from figure 1.

The cellulose blank structure 2 is transported to the feeding unit F for further transportation of the cellulose blank structure 2 to the shaping unit S and the forming moulds, and in the illustrated embodiment, the feeding unit F comprises a pair of feeding rollers. Thefeeding unit F is configured forfeeding the shaped cellulose blank structure 23 to the first forming mould M1 and the second forming mould M2. The feeding unit is further arranged to stop the feeding of the shaped cellulose blank structure 23 upon forming in the respective forming moulds. lt should however be understood that the feeding unit F may have any suitable configuration, such as conveyor belts or other transporting means. The feeding unit F may further be arranged with non-illustrated feeding rollers, feeding belts, or other transportation means arranged in connection to the first forming mould M1 and/or the second forming mould M2, for an efficient feeding, pulling and/or pushing of the shaped cellulose blank structure 23 through the bottle forming unit U. The feeding rollers, feeding belts, or other transportation means, may be arranged before and/or after the first forming mould M1 and/or the second forming mould M2, and provided with suitable gripping means forfeeding, pulling and/or pushing the shaped cellulose blank structure 23. The construction and layout of the feeding unit F may for example vary depending on the design of the bottle forming unit U, the size and design of the cellulose bottles 1 produced, and materials used in the cellulose blank structure 2. ln the illustrated embodiment, the shaping unit S comprises a plurality of deflecting rollers 8, as an alternative to the preferred forming shoulder in figs 8-14, for shaping the dry-formed cellulose blank structure 2 into the shaped cellulose blank structure 23. The deflecting rollers 8 are shaping the cellulose blank structure 2 upon feeding in a feeding direction DF through a deflecting movement of the cellulose blank structure 2 enabled by the deflecting rollers 8. When passing through the shaping unit S in thefeeding direction DF, the cellulose blank structure 2 is shaped into the shaped cellulose blank structure 23 with the tube-like configuration by the deflecting rollers 8, as understood from figure 1. The formed shaped cellulose blank structure 23 is suitably having an overlapping tube-like configuration O that is securing that the shaped cellulose blank structure 23 is formed without any gaps or open passages in the feeding direction DF. When being shaped, opposite side edges 2c of the cellulose blank structure 2 are overlapping each other in the shaped cellulose blank structure 23. The shaping unit S may in other non-illustrated embodiments be arranged with deflecting plates or similar arrangements instead of the deflecting rollers 8, or alternatively arranged with a combination of deflecting plates and deflecting rollers or as an alternative or in combination with the preferred forming shoulder in figs 8-14.

A dry-formed cellulose bottle 1 is schematically shown in figures 2a-b and 7. The cellulose bottle 1 has an extension in a longitudinal direction DLO and comprises a neck portion 1a, a closed bottom portion 1c, and a mid-portion 1b arranged in the longitudinal direction between the closed bottom portion 1c and the neck portion 1a. When the cellulose bottle 1 is arranged in the position shown in figures 2a-b and 7, the mid-portion 1b is arranged above the closed bottom portion 1c and the neck portion 1a is arranged above the mid-portion 1b. ln the following, when it is referred to relative positions of the cellulose bottle 1 when formed or upon forming, expressions such as above are referring to the positioning of the cellulose bottle 1 illustrated in figures 2a-b and 7, where the cellulose bottle 1 is arranged for being 21 placed on a surface in a standing position. The mid-portion 1b is arranged in fluid communication with the neck portion 1a, and the neck portion 1a is provided with a flow opening 1a0. The neck portion 1a suitably comprises a threaded section 1d for a secure attachment of a non-illustrated threaded cap.

The dry-formed cellulose bottle 1 is arranged as a rigid self-sustained cellulose-based bottle structure comprising compressed air-formed cellulose fibres. The neck portion 1a is in a conventional manner arranged with a through channel for transportation of liquids out from the cellulose bottle 1 via the flow opening 1a0. The closed bottom portion 1c and the mid-portion 1b are together forming a liquid holding space, and the mid-portion 1b has a hollow configuration.

The cellulose bottle 1 further comprises a compressed seam section 1e, as shown in figure 7. The seam section 1e is in the illustrated embodiment extending along the cellulose bottle 1 through the neck portion 1a, the mid-portion 1b and the closed bottom portion. The seam section is resulting from the overlapping tube-like configuration O of the shaped cellulose blank structure 23 when arranged in the forming moulds. The overlapping tube-like configuration O of the shaped cellulose blank structure 23 is securing that the cellulose bottle 1 is formed without any gaps or open passages. The seam section 1e is providing a rigid structural part ofthe cellulose bottle 1, and with the overlapping configuration resulting in the seam section 1e the cellulose bottle 1 can be formed without any residual parts of the cellulose blank structure 2 after forming of the cellulose bottle 1 in the first forming mould M1 and the second forming mould M2.

The seam section 1e is in the illustrated embodiment extending in the longitudinal direction of the cellulose bottle, or essentially in the longitudinal direction of the cellulose bottle, as shown in figure 7. The extension of the seam section is mainly determined by the overlapping tube-like configuration O of the shaped cellulose blank structure 23, and the extension of the seam section 1e along the cellulose bottle 1 is providing a rigid structural part along the length of the cellulose bottle 1. The seam section 1e of the neck portion 1a has a higher basis weight compared to at least adjacent parts of the neck portion 1a outside the seam section 1e. The seam section 1e of the mid-portion 1b has a higher basis weight compared to at least adjacent parts of the mid-portion 1b outside the seam section 1e. The seam section 1e of the closed bottom portion 1c has a higher basis weight compared to at least adjacent parts of 22 the closed bottom portion 1c outside the seam section 1e. The higher basis weight is resulting from the accumulation of material in the overlapping tube-like configuration O of the shaped cellulose blank structure 2S when forming the cellulose bottle 1. The higher basis weight is used for providing the rigid structural part of the cellulose bottle formed by the seam section 1e.

The neck portion 1a comprises a smooth inner surface 1a| and an outer surface 1aou arranged with the threaded section. The smooth inner surface 1a| is securing a surface structure suitable for preventing bacterial growth and for adding barrier structures, such as plastic films or additives. The threaded section 1d is enabling use of caps for closing the cellulose bottle 1.

As will be further described below, the closed bottom portion 1c comprises a centrally arranged closed collar section 1cC of compressed cellulose fibres. The centrally closed collar section 1cC is resulting from the bottle forming process in the first forming mould m1 and the second forming mould M2 and is providing a rigid bottom structure of the cellulose bottle 1.

The closed collar section 1cC is positioned at a distance above one or more lowest parts 1cL of the closed bottom portion 1c in the longitudinal direction, as understood from for example figure 7. With this configuration, the one or more lowest parts 1cL of the cellulose bottle 1 can be used for providing a stable bottom structure of the cellulose bottle 1, where the bottom structure suitably has an inwardly curved surface configuration. The cellulose bottle 1 has with this construction a high stability when placed on an object surface, such as for example a table surface or other surface. ln the embodiment illustrated in figure 7, the cellulose bottle 1 is arranged with several lowest parts 1cL for a high stability.

The neck portion 1a has a higher average basis weight compared to the mid-portion 1b, and the closed bottom portion 1c has a higher average basis weight compared to the mid-portion 1b. This configuration is providing high rigidity in the neck portion and the closed bottom portion, and is resulting from the bottle forming process where different parts of the shaped cellulose blank structure 23 are radially compressed to different degrees, as will be understood from the details of the bottle forming process described below. 23 The cellulose bottle 1 is formed in different forming steps in the first forming mould M1 and the second forming mould M2. The first forming mould M1 is used for forming the neck portion 1a of the cellulose bottle 1, and partly forming the closed bottom portion 1c of the cellulose bottle 1 into a semi-closed bottom portion 1cS. The second forming mould M2 is used for forming the mid-portion 1b of the cellulose bottle 1 and forming the closed bottom portion 1c from the semi-closed bottom portion 1cs. Upon forming of the semi-closed bottom portion 1cs in the first forming mould, a collar section 1cC of the semi-closed bottom portion 1cs is established by forces acting on the shaped cellulose blank structure 23.

Each individual cellulose bottle 1 is formed in main sequential forming steps in the first forming mould M1 and the second forming mould M2. The semi-closed bottom portion 1cs is formed in a first sequential forming step in the first forming mould M1, the neck portion 1a is formed in a second sequential forming step in the first forming mould M1, and the mid-portion 1b together with the closed bottom portion 1c is formed in a third sequential forming step in the second forming mould M2, as will be further described below.

The first forming mould M1 has a dual configuration for simultaneous forming of a neck portion 1a and a semi-closed bottom portion 1cs, and as understood from the illustrated configuration of the bottle forming unit U, the simultaneous forming in the first forming mould M1 is resulting in the forming of a neck portion 1a and a semi- closed bottom portion 1cS of different bottles. ln this way, the first forming mould M1 is configured for forming a neck portion 1a of a leading cellulose bottle 1L simultaneously with forming a semi-closed bottom portion 1cs of a directly following trailing cellulose bottle 1T from the shaped cellulose blank structure 23, as will be further described below.

The first forming mould M1 is schematically illustrated in figures 3a-e. ln figures 3a-e, the shaped cellulose blank structure 23 is sectioned for illustrative purposes, where only a part of the shaped cellulose blank structure 23 is shown. The first forming mould M1 comprises openable and closable first mould parts 3a,3b arranged around a pressure lance 5. An outer first mould part 3a is movably arranged relative to the pressure lance 5 as indicated with the arrow in figure 3a. The outer first mould part 3a is suitably displaceable in reciprocating linear movements towards and away from the pressure lance 5. An inner first mould part 3b comprises clamping arm sections 24 pivotably arranged relative to each other around a pivoting axis A, as indicated with arrows in figure 3a. The inner first mould part 3b is extending partly around the pressure lance 5. The inner first mould part 3a is suitably displaceable in pivoting movements around the pivoting axis A towards and away from the pressure lance 5. ln figure 3a, the first forming mould M1 is arranged in an open state S0, where the first mould parts 3a,3b have been displaced away from the pressure lance, allowing the shaped cellulose blank structure 23 to be fed around the pressure lance 5 and through the first mould parts 3a,3b, as shown in figure 3b.

The first forming mould M1 comprises a first forming cavity C1 formed between the first mould parts 3a,3b and the pressure lance 5, as shown in figures 3a-e. The feeding unit F is feeding the shaped cellulose blank structure 23 around the pressure lance 5 and through the first mould parts 3a,3b when the first mould parts 3a,3b are arranged in the open state S0. When the shaped cellulose blank structure 23 is arranged in the position shown in figure 3b, where the shaped cellulose blank structure 23 is positioned between the pressure lance 5 and the first mould parts 3a,3b, the first mould parts may be displaced towards the pressure lance 5, as indicated with arrows in figure 3c. Suitably, the inner first mould part 3b is pivoted towards the pressure lance 5 in a movement faster than the displacement of the outer first mould part 3b for an efficient forming process. When the inner first mould part 3b is closed, as shown in figure 3c, the outer first mould part 3a may be further pushed towards the pressure lance 5 with a suitable pushing force Fpto a closed state Se of the first forming mould M1, as indicated with the arrow in figure 3d. When closed, the first mould parts 3a,3b are pressing the shaped cellulose blank structure 23 radially against the pressure lance 5 for simultaneously forming the neck portion 1a and the semi-closed bottom portion 1cs in the first forming cavity C1. During the pressing operation, a first forming pressure Pm and a first forming temperature TF1 are at least applied onto the part of the shaped cellulose blank structure 23 used for forming the neck portion 1a in the first forming cavity C1. After the forming operation the first forming mould M1 is returned to the open state S0, as shown in figure 3e. ln figure 3e, the formed neck portion 1a and the semi-closed bottom portion 1cS with the collar section 1cC is schematically shown, where the collar section 1cC is the most narrow portion of the semi-closed bottom portion 1cs that is transitioning towards the neck portion 1a. As understood from the figure, the collar section 1cC has a collar opening 1c0 that is corresponding to the flow opening 1a0 of the neck portion 1a.

The first forming mould M1 suitably comprises a thread forming section 3c, as shown in for example figure 3a. The thread forming section 3c is forming the threaded section 1d of the neck portion 1a upon forming of the neck portion 1a in the first forming mould M1. The thread forming section is arranged With a threaded pattern for efficient forming of threads of the threaded section on the outside surface of the neck portion 1a in the first forming mould, as understood from the figures.

The applied second forming pressure PF2 is suitably in the range of 1-100 MPa, preferably 4-20 MPa, and the applied second forming temperature TF2 is suitably in the range of 100-300 °C, preferably 100-200 °C.

The first mould parts 3a,3b of the first forming mould M1 are suitably arranged as stiff mould parts. With stiff mould parts is meant that the mould parts are made of a stiff material with limited deformation capabilities, such as for example steel, aluminium, composite materials or a combination of different materials. The section of the pressure lance 5 extending through the first forming mould M1 is suitably made of a stiff material with limited deformation capabilities, such as for example steel, aluminium, composite materials or a combination of different materials. This section of the pressure lance 6 may be stiffer than the other parts of the pressure lance 6 to withstand the high forming pressure in the first forming mould M1. ln one embodiment, the section of the pressure lance 5 extending through the first forming mould M1 is reinforced with an outer structural piece of material surrounding the pressure lance 5, establishing a strong structural part around the pressure lance 5. The pressure lance 5 can be heated to support heating the cellulose web structure 2 when forming the neck portion in the first forming mould M1.

The first mould part M1 may further comprise a heating unit. The heating unit is configured for applying the first forming temperature TF1 onto the shaped cellulose blank structure 23 in the first forming cavity C1 during the forming operation in the first forming mould M1. The heating unit may have any suitable configuration. The heating unit may be integrated in or cast into the first mould parts 3a,3b, and suitable heating devices are e.g. electrical heaters, such as resistor elements, or fluid heaters. Other suitable heat sources may also be used.

The shaped cellulose blank structure 23 may in other non-illustrated embodiments be pre-shaped into an hourglass-shape before being inserted into thefirstforming mould 26 M1 forfacilitating the forming operation in the first forming mould M1. Suitable shaping elements may be used for delimiting the radial extension of sections of the pre-shaped cellulose blank structure 23 for enabling the hourglass shape. The shaping elements may for example be arranged as a snare structure or snare-like element arranged around the shaped cellulose blank structure 23 upstream the first forming mould M1, where the snare structure or snare-like element upon constriction is delimiting the radial extension of a section of the shaped cellulose blank structure 23. After pre- shaping, the snare structure or snare-like element is returning to a non-constricted state for feeding of the pre-shaped section of the shaped cellulose blank structure 23 to the first forming mould M1.

As described above, each individual cellulose bottle 1 is formed in sequential steps in the first forming mould M1 and the second forming mould M2. When the semi-closed bottom portion 1c3 and the neck portion 1a for an individual bottle 1 have been formed in the first sequential and second sequential forming steps in the first forming mould M1, the semi-closed bottom portion 1c3 and the neck portion 1a together with an intermediate section Sim of the shaped cellulose blank structure 23 between the formed semi-closed bottom portion1c3 and the neck portion 1a is transported to the second forming mould M2. The mid-portion 1b together with the closed bottom portion is formed in a third sequential forming step in the second forming mould M2, as will be further described below.

A shaped cellulose blank structure 23 is schematically shown in figure 2c. The shaped cellulose blank structure 23 is during the forming operation transported in the feeding direction DF through the first forming mould M1 and thereafter through the second forming mould M2. ln figure 2c, the shaped cellulose blank structure 23 is divided in a first section S1, an intermediate section Sim, and a second section S2, as illustrated in figure 2d, where the different sections are used for forming different parts of each cellulose bottle 1. ln the first sequential forming step, the first section S1 is fed to the first forming mould M1. The first section S1 of the shaped cellulose blank structure 2S is used forforming the semi-closed portion 1c3 of the cellulose bottle 1 simultaneously with forming the neck portion 1a of a directly preceding cellulose bottle 1P, as understood from figure 2e. Thereafter, in the second sequential forming step, the following second section S2 arranged at a distance from the first section S1 is fed to the first forming mould M1. The second section S2 of the shaped cellulose blank 27 structure ZS is used for forming the neck portion 1a of the cellulose bottle 1 simultaneously with forming the semi-closed portion 1cS of a directly following cellulose bottle 1F, as understood from figure Ze. The part of the shaped cellulose blank structure ZS shown in figure Ze is illustrating the configuration after the two sequential forming steps of forming operations in the first forming mould M1. As understood from figure Ze, the intermediate section S|NT has not yet been shaped or formed in a forming mould after the two sequential steps of forming operations in the first forming mould M1. As described above, upon forming of the semi-closed bottom portion 1cS in the first forming mould, the collar section 1cC of the semi-closed bottom portion 1cS is established by forces acting on the shaped cellulose blank structure ZS. The collar section 1cC is defined as the most narrow portion of the semi-closed bottom portion 1cS that is transitioning towards the neck portion 1a, as for example shown in figure Ze.

A row of cellulose bottles 1 are produced after each other from the shaped cellulose blank structure ZS, as understood from for example figure Ze. As indicated in figure Ze, consecutive cellulose bottles can be formed from the shaped cellulose blank structure ZS, which in the figure has been pre-shaped in the first forming mould M1 as described above. ln figure Zf, the relationship between following cellulose bottles is illustrated, where a leading cellulose bottle 1L is directly followed by a trailing cellulose bottle 1T. The expressions leading and trailing are in this respect referring to the feeding direction DF, and a leading cellulose bottle 1L is thus formed before a trailing cellulose bottle 1T in the first and second forming moulds. lf referring to figures Ze-f, the preceding cellulose bottle 1P illustrated in figure Ze is a leading cellulose bottle 1L relative to the directly succeeding cellulose bottle 1, and the cellulose bottle 1 is a trailing bottle relative to the preceding cellulose bottle 1P. lf again referring to figures Ze-f, the cellulose bottle 1 illustrated in figure Ze is a leading cellulose bottle 1L relative to the directly succeeding following cellulose bottle 1F, and the following cellulose bottle 1F is a trailing bottle relative to the cellulose bottle 1. The expressions above will be used in the following to define relationships in the cellulose bottle forming flow.

The second forming mould MZ is schematically illustrated in figures 4a-e. The second forming mould MZ comprises openable and closable second mould parts 4a,4b forming a second forming cavity CZ. Aflexible membrane 6 is arranged in the second 28 forming cavity C2, and the flexible membrane 6 is connected to and arranged in fluid communication with the pressure lance 5. The pressure lance 5 is suitably extending to or partly into the second forming cavity C2.

An outer second mould part 4a and an inner second mould part 4b are movably arranged relative to each other and relative to the flexible membrane 6, as indicated with the double arrows in figures 1 and 4a. The outer second mould part 4a is suitably displaceable in reciprocating |inear movements towards and away from the inner second mould part 4b and the flexible membrane 6. The inner second mould part 4b is suitably displaceable in reciprocating |inear movements towards and away from the outer second mould part 4a and the flexible membrane 6. ln figure 4a, the second forming mould M2 is arranged in an open state S0, where the outer second mould part 4a and the inner second mould part 4b have been disp|aced in directions away from each other and away from the flexible membrane 6, allowing the shaped cellulose blank structure 23 to be fed around the flexible membrane 6 and received between the second mould parts 4a,4b, as shown in figure 4a. ln other non-illustrated embodiments, one of the outer second mould part 4a and the inner second mould part 4b may be arranged as a stationary mould part, where the other mould part is movably arranged.

The second forming mould M2 is forming the mid-portion 1b of the cellulose bottle 1 from the intermediate section Sim, and the closed bottom portion 1c of the cellulose bottle 1 from the semi-closed bottom portion 1cS in the second forming cavity C2. The feeding unit F is feeding the formed semi-closed bottom portion 1cS, the intermediate section Sim, and the formed neck portion 1a around the pressure lance 5 in the feeding direction DF from the first forming mould M1 towards the second forming mould M2 when the first mould parts 3a,3b and the second mould parts 4a,4b are arranged in open states S0. The feeding unit F is in this way feeding the formed semi- closed bottom portion 1cs and the intermediate section Sim of the shaped cellulose blank structure 23 between the formed semi-closed bottom portion 1cs and a directly following formed trailing neck portion 1aT to the second forming mould M2, as shown in figure 4a.

When the semi-closed bottom portion 1cS and the intermediate section Sim is arranged in the position shown in figure 4a, and thus positioned between the outer second mould part 4a and the inner second mould part 4b, with the flexible membrane 29 6 arranged inside the shaped cellulose blank structure 23, the outer second mould part 4a and the inner second mould part 4b are displaced towards each other for arranging the second forming mould M2 into a closed state SC, as shown in figures 4b-c. Upon displacement of the outer second mould part 4a and the inner second mould part 4b towards each other, the mould parts are pushing the semi-closed bottom portion 1cS towards a closed configuration, as shown in figures 4b-c and illustrated more in detail in figure 4e. The outer second mould part 4a and the inner second mould part 4b are gripping the collar section 1cC of the semi-closed bottom portion 1cs when moved towards each other for an efficient forming process. ln this way, the collar opening 1c0 of the semi-closed bottom portion 1cs is closed by the forces exerted by the second mould parts 4a,4b.

The movements of the outer second mould part 4a and the inner second mould part 4b towards the closed state SC are indicated with arrows in figure 4b. The outer second mould part 4a and the inner second mould part 4b are in this way pushed towards each otherfor closing the second forming mould M2. Upon further movement of the outer second mould part 4a and the inner second mould part 4b the second mould parts are arranged in contact with each other, and the second forming mould M2 is arranged in the closed state SC, as shown in figure 4c. To secure the closed state SC ofthe second forming mould M2 during the forming process, the outer second mould part 4a and the inner second mould part 4b are pushed towards each other with suitable pushing forces Fp, as shown in figure 4c. During the movements of the outer second mould part 4a and the inner second mould part 4b, the semi-closed bottom portion 1cs is further closed by the second mould parts, as described above and understood from figures 4b-c. ln the closed state SC, the second mould parts 4a,4b together with the flexible membrane 6 are forming the closed bottom portion 1c and the mid-portion 1c of the cellulose bottle 1 by inflating theflexible membrane 6 towards the second mould parts 4a,4b as understood from figure 4c. The flexible membrane 6 is inflated with a pressure medium P entering from the pressure lance 5, as indicated with the arrow in figure 4c. Thus, when the second mould parts 4a,4b are closed around the semi- closed bottom portion 1cS and the intermediate section SW, the further closed semi- closed bottom portion 1cs and the intermediate section Sim are pressed against the second mould parts 4a,4b by means of the inflated flexible membrane 6 for forming the cellulose bottle 1. ln this way, the flexible membrane 6 when inflated by the pressure medium P is applying a second forming pressure PF2 onto the intermediate section Sim and the further closed semi-closed bottom portion 1cS. Further, the applied second forming pressure PF2 together with an applied second forming temperature TF2 onto the further closed semi-closed bottom portion 1cs and the intermediate section Sim are forming the closed bottom portion 1c and the mid-portion 1c of the cellulose bottle 1 into rigid structures.

The bottom of the formed rigid closed bottom portion 1c of the cellulose bottle has an inwardly curved surface configuration, as understood from for example figures 1b, 4c, and 4e. The closed collar section 1cC of the semi-closed bottom portion 1cs is in this way arranged above the lowermost portions of the cellulose bottle 1, as shown in figure 4e. The inwardly curved surface configuration is enabled by the shape of the second mould parts 4a,4b and the inflation of the flexible membrane 6 upon forming in the second forming mould M2, where the flexible membrane is pushing the semi- closed bottom portion 1cs towards the second forming moulds 4a,4b. The inwardly curved surface configuration is providing a stable bottom structure of the cellulose bottle 1. The cellulose bottle 1 has with this construction a high stability when placed on an object surface, such as for example a table surface or other surface.

The already formed upper portion 1a is as understood from figures 4a-e arranged within the second forming mould M2 during the forming operation. lt should however be understood that no forming pressure is applied to the upper portion 1a in the second forming mould M2 during the forming of the cellulose bottle 1.

After the forming operation, the second forming mould M2 is returned to the open state S0, as shown in figure 4d, for an easy removal of the cellulose bottle 1 and for repeating the forming operation.

The second mould parts 4a,4b of the second forming mould M2 are suitably arranged as stiff mould parts. With stiff mould parts is meant that the mould parts are made of 31 a stiff material with limited deformation capabilities, such as for example steel, aluminium, composite materials or a combination of different materials.

The second mould part M2 may further comprise a heating unit. The heating unit is configured for applying the second forming temperature TF2 onto the shaped cellulose blank structure 23 and the semi-closed bottom portion 1cs during the forming operation in the second forming mould M2. The heating unit may have any suitable configuration. The heating unit may be integrated in or cast into the second mould parts 4a,4b, and suitable heating devices are e.g. electrical heaters, such as resistor elements, or fluid heaters. Other suitable heat sources may also be used.

The flexible membrane 6 is made of a material that is allowed to deform when being inflated upon forming of the cellulose bottles 1 in the second forming mould M2. Suitable materials are for elastomeric compositions, such as for example rubber, or other elastomers exhibiting elastic or rubber-like properties. The material used in the flexible membrane 6 suitably withstands high pressure levels from the pressure medium P when being inflated, as well as repeated inflation and deflation cycles.

The pressure medium P is used for establishing the second forming pressure PF2 in the second forming cavity C2 upon inflating the flexible membrane 6. The pressure medium P used in the forming operation in the second forming mould M2 may be a liquid composition or a gas, such as for example oil, water, or air.

The bottle forming unit U comprises a fluid control device D, as schematically indicated in figure 1. The pressure lance 5 is at a first end 5a arranged in fluid communication with thefluid control device D, and the pressure lance 5 is at a second end 5b arranged in fluid communication with the flexible membrane 6. The fluid control device D is configured for inflating the flexible membrane 6 with the pressure medium P via the pressure lance 5 upon forming in the second forming mould M2. The fluid control device D is further arranged for deflating the flexible membrane 6 via the pressure lance 5 after the forming operation in the second forming mould M2. The fluid control device may have any suitable configuration, and may comprise hydraulic or pneumatic cylinders, fluid pumps, compressors, or other pressure establishing devices for delivering pressurized pressure medium to the flexible membrane via the pressure lance 5. The bottle forming unit U may further comprise a control unit for controlling the forming operation. 32 The bottle forming unit U further comprises a cutting device 7 arranged in the second mould part M2 or in connection to the second mould part M2. ln the embodiment illustrated in figures 4a-e, the cutting device 7 is arranged in the second mould part M2. The cutting device 7 may be arranged with cutting edges 7a on the outer second mould part 4a and the inner second mould part 4b respectively as shown in figure 4e. The cutting device 7 is cutting off the formed neck portion 1a of a leading cellulose bottle 1L from the semi-closed bottom portion 1cs of a directly following trailing cellulose bottle 1T by means of the cutting device 7 upon closing of the second forming mould M2 during the forming operation of the cellulose bottle 1 in the second forming mould M2, as shown in figure 4e. ln figure 4e, the second forming mould M2 is illustrated in the closed state before the inflation of the flexible membrane 6 with the pressure medium P, and the cutting operation is suitably completed when the second mould part M2 is closed.

According to the embodiment shown in figures 4a-d, the pressure lance 5 extends into the second forming mould M2. The cutting device 7 may be arranged to work against and around the pressure lance 5 such that the pressure lance 5 acts as an anvil against which the cutting edges 7a are pressed, and the neck portion 1a is in this way separated from the semi-closed bottom portion 1cs accordingly. Here, the pressure lance 5 may comprise a reinforced portion that can withstand the pressure from the cutting edge. The reinforced portion can be arranged as a thicker material portion of the pressure lance 5 and/or can be made from a different material than adjacent portions of the pressure lance 5. As an alternative, the entire pressure lance 5 is made from a suitable material than can withstand pressure, both in the first forming mould M1 and the second forming mould M2. The reinforced portion can alternatively be arranged as a separate piece of material arranged around the pressure lance 5. The pressure lance 5 shall thus be able to withstand a high external pressure from the neck forming parts of the first forming mould parts as well as a high internal pressure from the pressure medium.

The bottle forming unit U may further comprise an auxiliary cutting device 9 arranged in the second mould part M2, as illustrated in figure 4e. The auxiliary cutting device 9 may be arranged with cutting edges 9a on the outer second mould part 4a and the inner second mould part 4b respectively as indicated in figure 4e. The auxiliary cutting device 9 is cutting off residual parts 1cR of the closed collar section 1cc of the semi- 33 closed bottom portion 1c3 that may extend out from the second forming mould M2 when arranged in the closed state SC.

The dry-forming process of the cellulose bottle 1 will be described below in connection to figures 5a-f. Throughout the dry-forming process, the dry-formed cellulose blank structure 2 is shaped into a shaped cellulose blank structure 23, where the shaped cellulose blank structure 23 has a tube-like configuration as described above. ln figure 5a, the first forming mould M1 is arranged in the open state So and the second forming mould M2 is arranged in the open state S0. The position in figure 5a is illustrating a position after the first sequential forming step in the first forming mould M1 and before the second sequential forming step in the first forming mould M1 for forming the cellulose bottle 1. ln this position shown in figure 5a, the first section S1 of the shaped cellulose blank structure 23 has already been fed to and further transported from the first forming mould M1, where the semi-closed bottom portion 1c3 of the cellulose bottle 1 together with the neck portion 1a of the directly preceding cellulose bottle 1P were simultaneously formed from the first section S1 in the first forming mould M1. ln the first sequential forming step, the shaped cellulose blank structure 23 was fed around the pressure lance 5 and through the first mould parts 3a,3b. Thereafter, the feeding of the shaped cellulose blank structure 23 was stopped when the first section S1 of the shaped cellulose blank structure 23 was arranged in a position aligned with the first mould parts 3a,3b. Then, the first mould parts 3a,3b were closed and the first section S1 was pressed against the pressure lance 5 by means of the first mould parts 3a,3b for forming the semi-closed bottom portion 1c3 of the cellulose bottle 1 in the first forming cavity C1, and simultaneously forming the neck portion 1a of the directly preceding cellulose bottle 1P in the first forming cavity C1. Upon forming of the semi-closed bottom portion 1c3 of the cellulose bottle 1 in the first forming mould M1, the first forming pressure PF1 and the first forming temperature TF1 were applied onto at least the part of the first section S1 of the shaped cellulose blank structure 23 used for forming the neck portion 1a of the preceding cellulose bottle 1P. lt should be understood that the first forming pressure PF1 and the first forming temperature TF1 also may be applied to at least a part of the first section S1 used for forming the semi-closed bottom portion 1c3 for a more structurally rigid formation of the semi-closed bottom portion 1c3. The first forming pressure PF1 and 34 the first forming temperature TF1 may for example be applied to the established collar section 1cC of the semi-closed bottom portion 1cs. ln the position shown in figure 5a, the following second section S2 of the shaped cellulose blank structure 23 has been fed to the first forming mould M1, and at the same time the formed neck portion 1a, the intermediate section Sim, and the semi- closed bottom portion 1cs, of the preceding cellulose bottle 1P have been fed to the second forming mould M2. When opening the first mould parts 3a,3b, the shaped cellulose blank structure 23 was fed around the pressure lance 5 and through the first mould parts 3a,3b. Thereafter, the feeding of the shaped cellulose blank structure 23 was stopped when the second section S2 of the shaped cellulose blank structure 23 is arranged in a position aligned with the first mould parts 3a,3b, as understood from figure 5a. ln figure 5b, the first forming mould M1 is arranged in the closed state SC and the second forming mould M2 is arranged in the closed state SC. The position of the shaped cellulose blank structure 23 in figure 5b, is illustrating a position in the first forming mould M1 during the second sequential forming step for forming the neck portion 1a of the cellulose bottle 1 and the semi-closed bottom portion 1cS of a directly following cellulose bottle 1F, and a position in the second forming mould M2 where the preceding bottle 1P is formed. ln this position shown in figure 5b, the neck portion 1a of the cellulose bottle 1 is formed simultaneously with the semi-closed bottom portion 1cs of a directly following cellulose bottle 1F from the second section S2 in the first forming mould M1. After closing of the first mould parts 3a,3b, the second section S2 is pressed against the pressure lance 5 by means of the first mould parts 3a,3b for forming the neck portion 1a of the cellulose bottle 1 in the first forming cavity C1, simultaneously with forming the semi-closed bottom portion 1cS of the directly following cellulose bottle 1F in the first forming cavity C1. Upon forming of the neck portion 1a of the cellulose bottle 1 in the first forming mould M1, the first forming pressure PF1 and the first forming temperature TF1 are applied onto at least the part of the second section S2 of the shaped cellulose blank structure 23 used for forming a structurally rigid neck portion 1a of the cellulose bottle 1. The threaded section 1d of the neck portion 1a is established by the threaded section 3c upon forming of the neck portion 1a in the first forming mould M1. lt should be understood that the first forming pressure PF1 and the first forming temperature TF1 also may be applied to the at least a part of the second section S2 used for forming the semi-closed bottom portion 1cs of the directly following cellulose bottle 1F for a more structurally rigid formation of the semi-closed bottom portion 1cs. The first forming pressure Pri and the first forming temperature TFi may for example be applied to the established collar section 1cc of the semi-closed bottom portion 1cS of the directly following cellulose bottle 1F. ln figure 5c, the first forming mould M1 and the second forming mould M2 have returned to the open states S0. ln figure 5c, the formed preceding bottle 1P can be removed from the second forming mould M2, as indicated with the arrow. Thereafter, the formed semi-closed bottom portion 1cs of the cellulose bottle 1 and an intermediate section Sim of the shaped cellulose blank structure 23 between the formed semi-closed bottom portion 1cs of the cellulose bottle 1 and the formed neck portion 1a of the cellulose bottle 1 is fed to the second forming mould M2, as shown in figure 5d. ln the second forming mould M2, the mid-portion 1b of the cellulose bottle 1 is formed from the intermediate section Sim and the closed bottom portion 1c of the cellulose bottle 1 is formed from the semi-closed bottom portion 1cs. To form the cellulose bottle 1 in the third sequential forming step in the second forming mould M2, the semi-closed bottom portion 1cs and the intermediate section Sim is fed around the pressure lance 5 into the second forming mould M2, as shown in figure 5d. The feeding of the semi- closed bottom portion 1cs and the intermediate section Sim is stopped when positioned between the open second mould parts 4a,4b, as shown in figure 5d. Thereafter the second mould parts 4a,4b are closed around the semi-closed bottom portion 1cs and the intermediate section Sim and the flexible membrane 6 is inflated with the pressure medium P entering from the pressure lance 5, as shown in figure 5e. The second forming pressure PF2 is applied onto the semi-closed bottom portion 1cs and the intermediate section Sim by pressing the semi-closed bottom portion 1cs and the intermediate section Sim against the second mould parts 4a,4b by means of the inflated flexible membrane 6. The second forming temperature TF2 is applied onto the semi-closed bottom portion 1cs and the intermediate section Sim, for forming the closed bottom portion 1c and the mid-portion 1c of the cellulose bottle 1 into rigid structures. The earlier formed neck portion 1a of the cellulose bottle 1 is cut off from the semi-closed bottom portion 1cs of the directly following cellulose bottle 1F by means of the cutting device 7 during the forming of the cellulose bottle 1 in the second 36 forming mould M2. ln figure 5e, the neck portion 1a of the following bottle 1F is formed in the first forming mould M1 together with the semi-closed bottom portion of a further following cellulose bottle 1FF. After the forming operation, the flexible membrane 6 is deflated and the second mould parts 4a,4b are opened for removal of the formed cellulose bottle 1 from the second forming mould M2, as shown in figure 5f. A negative pressure may be applied to the flexible membrane 6 for an efficient deflating operation. ln one embodiment, the first mould parts 3a,3b and the second mould parts 4a,4b are simultaneously closed. ln other embodiments, the first mould parts 3a,3b and the second mould parts 4a,4b are non-simultaneously closed.

The bottle forming unit U may further be arranged with a transporting unit T for transportation of formed cellulose bottles 1 away from the second forming mould M2, as shown in figure 6.

Fig. 10 schematically shows, in a perspective view from above and side, a forming shoulder with a cellulose blank structure.

Fig. 11 schematically shows, in a perspective view from below and side, a forming shoulder with a cellulose blank structure.

Fig. 12 schematically shows, in a perspective view from above and side, a forming shoulder.

Fig. 13 schematically shows, in a perspective view from below and side, a forming shoulder.

Fig. 14 schematically shows, in a perspective view from above and side, a forming shoulder with a cellulose blank structure, a pressure lance with a flexible membrane attached on one end and a second forming mould in an open state.

Fig. 15 schematically shows, a side view in cross-section of the second forming mould in an open state with a moveable pressure lance and a moveable bottom portion. 37 Figure 15 shows that the forming mould M2 comprises a first mould part 4a and a second mould part 4b that together are forming a forming cavity C2. The first mould part 4a and/or the second mould part 4b are movably arranged at least in the lateral direction DLA of the forming mould M2 for displacing the forming mould M2 between an open state S0 and a closed state S0, fig 16. ln the open state S0, the forming mould M2 is configured for receiving cellulose fibres CF into the forming cavity C2, and in the closed state S0 the forming mould M2 is configured for being closed around the cellulose fibres CF in the forming cavity C2.

The product forming unit U further comprises a pressure lance 5 having a first end 5a and a second end 5b. The second end 5b of the pressure lance 5 is extending to or partly into the forming cavity C2, and the second end 5b is connected to and arranged in fluid communication with a flexible membrane 6 arranged in the forming cavity C2. A pressure medium P is used for inflating the flexible membrane 6 when dry-forming the cellulose products 1, as explained above. ln the embodiment shown in figure 15, the first mould part 4a is movably arranged in the lateral direction DLA of the forming mould M2, as indicated with the double arrow in figure 1a. The first mould part 4a is when moved displacing the forming mould M2 between the open state S0, as illustrated in figure 4a, and the closed state S0, as illustrated in figure 4b. The second mould part 4b is arranged as a stationary or non- movable mould part.

This configuration of the forming mould M2 illustrated in figures 15 and 16, where the second mould part 4b is arranged as a stationary mould part and the first mould part 4a is movably arranged relative to the second mould part 4b upon displacement of the forming mould M2 between the open state S0 and the closed state S0, is enabling an efficient and rigid construction of the forming mould M2 where only one mould part needs to be displaced. Upon displacement of the forming mould M2 from the open state S0 to the closed state S0, the first mould part 4a and the second end 5b of the pressure lance 5 are configured for being displaced towards the second mould part 4b, as understood from figures 1a-b. Upon displacement of the forming mould M2 from the closed state S0 to the open state S0 the first mould part 4a and the second end 5b of the pressure lance 5 are configured for being displaced away from the second mould part 4b. 38 Fig. 16 schematically shows, the side view in figure 15 in a closed state With a cellulose web structure and expanded flexible membrane.

Figure 16 shows the forming mould arranged in the closed state SC, the flexible membrane 6 is further inflated into a fully inflated state for establishing a forming pressure PF2 for an efficient dry-forming operation of the cellulose product 1 in the forming mould M2, as shown in figure 1g. Thus, when the forming mould M2 is closed around the cellulose fibres CF, the flexible membrane 6 is fully inflated with the pressure medium P for applying the forming pressure PF2 onto the cellulose fibres CF. The flexible membrane 6 is inflated With the pressure medium P entering from the pressure lance 5, and the forming pressure PF2 is applied onto the cellulose fibres CF by pressing the cellulose fibres CF against the upper mould parts 4a,4b and lower mould parts 4c,4d by means of the inflated flexible membrane 6. A forming temperature TF2 is applied onto the cellulose fibres CF in the forming mould M2. ln this way the forming pressure PF2 and the forming temperature TF2 are enabling the dry-forming of the cellulose product 1 into a three-dimensional compressed fibre structure CFCS having a closed bottom portion 1c and an upper portion 1b.

The applied forming pressure PF2 in the forming mould M2 is suitably in the range of 1-100 MPa, preferably 4-20 MPa, and the applied forming temperature TF2 is suitably in the range of 60-300 °C, preferably 100-200 °C.

The disclosure in figures 8-14 concerns a method for dry-forming at least a part of a cellulose bottle 1 from an air-formed cellulose blank structure 2 in a bottle forming unit U, wherein the method comprises the steps: shaping the dry-formed cellulose blank structure 2 in a shaping unit S into a shaped cellulose blank structure 23, wherein the shaped cellulose blank structure 23 has a tube-like configuration with an inner surface 2a and an outer surface 2b; wherein the step of shaping the dry-formed cellulose blank structure 2 into a shaped cellulose blank structure 23 comprises the step of feeding the dry-formed cellulose blank structure 2 to and over an upper surface 12 of a forming shoulder 10 of the shaping unit S and then into a forming through channel 11 of the forming shoulder 10 and around a pressure lance 5 extending through the forming through channel 11. 39 lt should be noted that the disclosure in connection to figures 8-14, could be read together with the disclosure in connection to figures 1-7 and 15 and 16, where the deflecting rollers 8 in the shaping unit S in figures 1-7 have been replaced at least in part with a forming shou|der 10 according to figures 8-14.

Advantages with these features are that the method is enabling an efficient production process, where ce||u|ose bottles with high quality can be produced at high speeds. The handling of the air-formed ce||u|ose blank structure is simplified through use of the forming shou|der for shaping the ce||u|ose blank structure into the tube-like configuration, and the first forming mould is used for efficiently producing at least part of a bottle with a neck portion having high finish and a semi-closed bottom prepared for closing in a second step, at increased production rates. ln this way, a more efficient bottle forming method for producing high-quality ce||u|ose bottles is achieved. The simultaneous forming of the semi-closed bottom portion of the ce||u|ose bottle and the neck portion of a directly preceding ce||u|ose bottle is providing a unique and fast forming operation.

According to one example shown in figures 8-14, the step of feeding the dry-formed ce||u|ose blank structure 2 to and over an upper surface 12 of a forming shou|der 10 and then into a forming through channel 11 of the forming shou|der 10, comprises the step of feeding the ce||u|ose blank structure, over the upper surface 12 perpendicular to the through channel 11,fig. 8, or at an angle, figs. 10 and 17, to the through channel 11, dependent on e.g. type of ce||u|ose fiber, thickness of the ce||u|ose blank structure 2, degree of compaction of the ce||u|ose blank structure 2, additional layers added to the ce||u|ose blank structure. The angle is important for allowing the ce||u|ose blank structure 2 to fold into the opening and into the tube-like form, with or without other layers. The other layers can be a layer that should serve as an inside barrier of the bottle made from any suitable material that gives a leak proof bottle. The inside barrier can be attached the inside ce||u|ose fiber wall of the bottle partly or wholly or can also be part a separate bag like part that can be removed from the bottle upon recycling. The inside barrier can comprise on ore many layers chosen from various suitable materials, e.g. a plastic layer, rubber layer, metal layer, additive treated ce||u|ose layer, etc. dependent on type of content in the bottle, e.g. still or carbonated water, alcohol beverages, etc. lt should be noted that in figure 10, it is depicted a ce||u|ose blank structure 2 at an angle to the through channel 11 and also an alternative perpendicular feeding of the cellulose blank structure 2x in relation to the through channel. The cellulose blank structure 2 can be fed with or without additional layer or layers. The expression “at an angle” refers to when the cellulose blank structure 2, with or without additional layer or layers, is fed at an angle to the through channel 11, wherein the angle can be negative or positive.

Figure 17 schematically shows when the cellulose structure 2 is fed by a feeding unit F by feeding rollers FR over and along the upper surface 12, wherein the upper surface 12 is arranged at positive angle to the transition portion 13 and thus to the through channel 11. A negative angle refers to when the cellulose blank structure 2 is fed over and along the upper surface 12, wherein the upper surface is at a negative angle to the transition portion 13 and thus the through channel 11, not illustrated. ln figures 14 and 17, the forming shoulder 10 is depicted as feeding the tube-like configurated cellulose web structure 2 directly to the second forming mould M2 and that is a possibility only if the first forming mould M1 is omitted and adequate alterations are made regarding cutting and forming the intended cellulose bottle 1, but figures 14 and 17 should be read in conjunction with figures 1-7 for best performance of a two-step bottle forming.

According to one example shown in figures 8-14, the step of feeding the dry-formed cellulose blank structure 2 into the forming through channel 11 of the forming shoulder 10 and around the pressure lance 5 extending through the forming through channel , comprises the step of folding the cellulose blank structure 2 into an overlapping manner along an extension of the tube-like configuration with the inner surface 2a overlapping the outer surface 2b.

According to one example shown in figures 1-16 the at least a part of the dry-formed cellulose bottle 1 comprises a neck portion 1a, a semi-closed bottom portion 1c, and a mid-portion 1b arranged between the semi-closed bottom portion 1c and the neck portion 1a, wherein the mid-portion 1b is arranged in fluid communication with the neck portion 1a, wherein the method comprises the steps: feeding a first section S1 of the shaped cellulose blank structure 23 to a first forming mould M1 and forming the semi-closed bottom portion 1cS of the cellulose bottle 1 from thefirst section S1 in the first forming mould M1, simultaneously with forming the 41 neck portion 1a of a directly preceding cellulose bottle 1P from the first section S1 in the first forming mould M1; feeding a following second section S2 of the shaped cellulose blank structure 23 to the first forming mould M1 and forming the neck portion 1a of the cellulose bottle 1 from the second section S2 in the first forming mould M1, simultaneously with forming a semi-closed bottom portion 1cS of a directly following cellulose bottle 1F from the second section S2 in the first forming mould M1.

As shown in figures 1-16, the disclosure further concerns a bottle forming unit U for dry-forming at least a part of a cellulose bottle 1 from an air-formed cellulose blank structure 2, wherein the bottle forming unit U comprises a feeding unit F, a shaping unit S and a pressure lance 5, wherein the shaping unit S is configured for shaping the dry-formed cellulose blank structure 2 into a shaped cellulose blank structure 23 having a tube-like configuration with an inner surface 2a and an outer surface 2b, wherein the shaping unit S comprises a forming shoulder 10 comprising an upper surface 12 and a forming through channel 11, wherein the forming shoulder 10 comprises a transition portion 13 between the upper surface 12 and the through channel 11, wherein the shaping unit S is configured to guide the cellulose blank structure 2 when fed to the forming unit S over the upper surface 12 then into the transition portion 13 and then into the forming through channel 11 and around the pressure lance 5 extending through the forming through channel 11.

According to one example, the shaping unit S is configured to allow the guiding of the cellulose blank structure 2 along and over the upper surface 12, wherein the upper surface 12 is arranged perpendicular, fig. 8, to the through channel, or wherein the upper surface 12 is arranged at an angle to the through channel, figs. 10 and 17, dependent on type of cellulose fiber, thickness of the cellulose blank structure 2, degree of compaction of the cellulose blank structure 2, additional layers added to the cellulose blank structure, etc.

According to one example shown in figures 8-14, the forming through channel 11 comprises an open and overlapping portion 14 extending in the feeding direction of the cellulose blank structure 2, wherein the overlapping portion 14 is configured to 42 guide the cellulose blank structure 2 into a folded and overlapping manner along an extension of the tube-like configuration with the inner surface 2a overlapping the outer surface 2b when the cellulose blank structure is fed and guided into and through the forming through channel 11 and around the pressure lance 5 extending through the forming through channel 11. Figs. 10-13 The open and overlapping portion 14 comprises two opposing and overlapping end portions configured with a predetermined gap G between them. The size of the gap G is determined on the thickness of the cellulose web structure and additional material layers if applicable. The open and overlapping portion 14 can be described as slitting open a cylindrical tube along its longitudinal extension, cylindrical coordinates, creating two opposing end portions which are then worked such that one end portion, inner end portion, becomes less in a radial direction compared to the other end portion, outer end portion, and then squeezing the cylindrical tube to a lesser diameter than before slitting, and thus forcing the end portion with lesser radius in behind the other and more radially outward end portion. ln this way, the end portions overlap with a predetermined gap G between them in the radial direction. When the cellulose web structure, with or without additional layers, is guided properly into the through opening of the forming shoulder, one side portion of the cellulose web structure enters into the gap G and an opposite side portion of the cellulose web structure will follow the inner curvature of the inner end portion of the through channel, and when the cellulose web structure exits the through opening the side portions will overlap in the then created tube-like configuration. Here, side portions of the cellulose web structure refers to the portions of the cellulose web portion that restricts the cellulose web portion in width, wherein width is perpendicular to the feeding direction.

According to one example shown in figures 1-7, the at least a part of the dry-formed cellulose bottle 1 comprises a neck portion 1a, a semi-closed bottom portion 1c, and a mid-portion 1b arranged between the semi-closed bottom portion 1c and the neck portion 1a, wherein the mid-portion 1b is arranged in fluid communication with the neck portion 1a, wherein the bottle forming unit U comprises a first forming mould M1, wherein the feeding unit F is configured for feeding the shaped cellulose blank structure 23 to the first forming mould M1, wherein the first forming mould M1 is configured for forming a neck portion 1a of a leading cellulose bottle 1L 43 simultaneously with forming a semi-closed bottom portion 1cs of a directly following trailing cellulose bottle 1T from the shaped cellulose blank structure 23. lt should be noted that the upper surface 12 can in its entirety or partly be flat and/or concave and/or convex and/or undulating or any suitable shape that enables and improves material handling of the cellulose Web structure, With or without additional layers, over the upper surface.

The transition portion can have any suitable shape and form dependent on the cellulose web structure, with or without additional layers, that enables and improves the folding of the cellulose web structure into the tub-like shape in the through channel. For example, the transition portion can be funnel shaped, a sharp edge between the upper surface and the through channel, The cellulose web structure can comprise additional layers as mentioned above. Since the web then, with additional layers, will be shaped into the tube-like shape according to the above, the additional layers can be made wider than the cellulose web structure at least over the outside of the cellulose web structure in order to comply with the fact that the outside of the tub-like shaped cellulose web structure has a longer peripheral length on the outside than on the inside of the tube. The additional outer layer may also be so wide that an overlapping part overlaps directly onto itself after folding, which is suitable since the additional layer then can be attached to itself and thus give a seam the e.g. prevents moist from reaching the cellulose web stru ctu re. lt will be appreciated that the above description is merely exemplary in nature and is not intended to limit the present disclosure, its application or uses. While specific examples have been described in the specification and illustrated in the drawings, it will be understood by those of ordinary skill in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present disclosure as defined in the claims. Furthermore, modifications may be made to adapt a particular situation or material to the teachings of the present disclosure Without departing from the essential scope thereof. Therefore, it is intended that the present disclosure not be limited to the particular examples illustrated by the drawings and described in the specification as the best mode presently contemplated for carrying out the teachings of the present disclosure, 44 but that the scope of the present disclosure will include any embodiments falling within the foregoing description and the appended claims. Reference signs mentioned in the claims should not be seen as limiting the extent of the matter protected by the claims, and their sole function is to make claims easier to understand.

Claims

1. A method for dry-forming at least a part of a cellulose bottle (1) from an air-formed cellulose blank structure (2) in a bottle forming unit (U), wherein the method comprises the steps: shaping the dry-formed cellulose blank structure (2) in a shaping unit (S) into a shaped cellulose blank structure (23), wherein the shaped cellulose blank structure (23) has a tube-like configuration with an inner surface (2a) and an outer surface (2b); wherein the step of shaping the dry-formed cellulose blank structure (2) into a shaped cellulose blank structure (23) comprises the step of feeding the dry-formed cellulose blank structure (2) to and over an upper surface (12) of a forming shoulder (10) of the shaping unit (S) and then into a forming through channel (1 1) of the forming shoulder (10) and around a pressure lance (5) extending through the forming through channel (11).

2. The method according to claim 1, wherein the step of feeding the dry-formed cellulose blank structure (2) to and over an upper surface (12) of a forming shoulder (10) and then into a forming through channel (11) of the forming shoulder (10), comprises the step of feeding the cellulose blank structure (2) over the upper surface (12) perpendicularto through channel (11) or at an angle to the through channel (11).

3. The method according to claim 1 or 2, wherein the step of feeding the dry-formed cellulose blank structure (2) into the forming through channel (11) of the forming shoulder (10) and around the pressure lance (5) extending through the forming through channel (11), comprises the step of folding the cellulose blank structure (2) into an overlapping manner along an extension of the tube-like configuration with the inner surface (2a) overlapping the outer surface (2b).

4. The method according to any one of claims 1-3, wherein the at least a part of the dry-formed cellulose bottle (1) comprises a neck portion (1a), a semi-closed bottom portion (1c), and a mid-portion (1b) arranged between the semi-closed bottom portion (1c) and the neck portion (1a), wherein the mid-portion (1 b) is arranged in fluid communication with the neck portion (1 a), wherein the method comprises the steps:feeding a first section (S1 ) of the shaped cellulose blank structure (23) to a first forming mould (M1) and forming the semi-closed bottom portion (1c3) of the cellulose bottle (1) from the first section (S1) in the first forming mould (M1), simultaneously with forming the neck portion (1a) of a directly preceding cellulose bottle (1 P) from the first section (S1) in the first forming mould (M1); feeding a following second section (S2) of the shaped cellulose blank structure (23) to thefirstforming mould (M1) and forming the neck portion (1a) of the cellulose bottle (1)from the second section (S2) in the first forming mould (M1), simultaneously with forming a semi-closed bottom portion (1c3) of a directly following cellulose bottle (1 F) from the second section (S2) in the first forming mould (M1).

5. The method according to claim 4, wherein the first forming mould (M1) comprises openable and closable first mould parts (3a,3b) arranged around the pressure lance (5), wherein a first forming cavity (C1) is formed between the first mould parts (3a,3b) and the pressure lance (5), wherein the forming of the semi-closed bottom portion (1c3) of the cellulose bottle (1) in the first forming mould (M1) further comprises the steps: opening the first mould parts (3a,3b); feeding the shaped cellulose blank structure (23) around the pressure lance (5) and through the first mould parts (3a,3b); stopping the feeding of the shaped cellulose blank structure (23) when the first section (S1) of the shaped cellulose blank structure (23) is arranged in a position aligned with the first mould parts (3a,3b); closing the first mould parts (3a,3b) and pressing the first section (S1) against the pressure lance (5) by means of the first mould parts (3a,3b) for forming the semi- closed bottom portion (1c3) of the cellulose bottle (1) in the first forming cavity (C1), and simultaneously forming the neck portion (1a) of the directly preceding cellulose bottle (1 P) in the first forming cavity (C1).

6. The method according to claim 5, wherein the forming of the neck portion (1a) of the cellulose bottle (1) in the first forming mould (M1)further comprises the steps: opening the first mould parts (3a,3b); feeding the shaped cellulose blank structure (23) around the pressure lance (5) and through the first mould parts (3a,3b); stopping the feeding of the shaped cellulose blank structure (23) when the second section (S2) of the shaped cellulose blank structure (23) is arranged in a position aligned with the first mould parts (3a,3b); closing the first mould parts (3a,3b) and pressing the second section (S2) against the pressure |ance (5) by means of the first mould parts (3a,3b) for forming the neck portion (1a) of the cellulose bottle (1) in the first forming cavity (C1), and simultaneously forming the semi-closed bottom portion (1c3) of the directly following cellulose bottle (1 F) in the first forming cavity (C1).

7. The method according to claim 6, wherein the forming of the neck portion (1a) of the cellulose bottle (1) in the first forming mould (M1 ) further comprises the steps: applying a first forming pressure (PF1) and a first forming temperature (TF1) onto a part of the second section (S2) of the shaped cellulose blank structure (23) for forming a structurally rigid neck portion (1a).

8. The method according to any preceding claim, wherein the method further comprises the steps: feeding the formed semi-closed bottom portion (1c3) of the cellulose bottle (1) and an intermediate section (Sim) of the shaped cellulose blank structure (23) between the formed semi-closed bottom portion (1 c3) ofthe cellulose bottle (1 ) and the formed neck portion (1 a) ofthe cellulose bottle (1 ) to a second forming mould (M2); forming the mid-portion (1b) of the cellulose bottle (1) from the intermediate section (Sim) and forming the closed bottom portion (1c) of the cellulose bottle (1) from the semi-closed bottom portion (1c3) in the second forming mould (M2).

9. The method according to claim 8, wherein the second forming mould (M2) comprises openable and closable second mould parts (4a,4b) forming a second forming cavity (C2), wherein a flexible membrane (6) connected to and arranged in fluid communication with the pressure |ance (5) is arranged in the second forming cavity (C2), wherein the forming of the mid-portion (1b) and the closed bottom portion (1c) in the second forming mould (M2) further comprises the steps: opening the first mould parts (3a,3b) and opening the second mould parts (4a,4b); feeding the semi-closed bottom portion (1cs) and the intermediate section (Sim) around the pressure lance (5) into the second forming mould (M2); stopping the feeding of the semi-closed bottom portion (1cs) and the intermediate section (Sim) when positioned between the open second mould parts (4a,4b); closing the second mould parts (4a,4b) around the semi-closed bottom portion (1cs) and the intermediate section (Sim) and inflating the flexible membrane (6) with a pressure medium (P) entering from the pressure lance (5) and applying a second forming pressure (PF2) onto the semi-closed bottom portion (1cs) and the intermediate section (Sim) by pressing the semi-closed bottom portion (1cs) and the intermediate section (Sim) against the second mould parts (4a,4b) by means of the inf|ated flexible membrane (6), and applying a second forming temperature (TF2) onto the semi-closed bottom portion (1cS) and the intermediate section (Sim), for forming the closed bottom portion (1c) and the mid-portion (1c); deflating the flexible membrane (6) and opening the second mould parts (4a,4b); removing the formed cellulose bottle (1) from the second forming mould (M2).

10. The method according to any preceding claim, wherein upon forming of the semi-closed bottom portion (1cs) in the first forming mould (M1), a collar section (1cC) of the semi-closed bottom portion (1cs) is established by forces acting on the shaped cellulose blank structure (23), wherein the method further comprises the step: pushing the semi-closed bottom portion (1cs) towards a closed configuration upon closing the second mould parts (4a,4b) of the second forming mould (M2) around the semi-closed bottom portion (1cs), wherein the collar opening (1c0) of the semi-closed bottom portion (1cs) is closed by the forces exerted by the second mould parts (4a,4b).

11. The method according to claim 9 or 10, wherein the method further comprises the step: closing the first mould parts (3a,3b) simultaneously with closing the second mould parts (4a,4b).

12. The method according to any of claims 8 to 11, wherein the bottle forming unit (U) further comprises a cutting device (7) arranged in the second mould part (M2) or in connection to the second mould part (M2), wherein the method further comprises the step: cutting off the formed neck portion (1a) of the cellulose bottle (1) from the semi-closed bottom portion (1cS) of the directly following cellulose bottle (1F) by means of the cutting device (7) during the forming of the cellulose bottle (1) in the second forming mould (M2).

13. The method according to any preceding claim, wherein thefirstforming mould (M1) comprises a thread forming section (3c), wherein the method further comprises the step: forming a threaded section (1d) of the neck portion (1a) upon forming of the neck portion (1a) in the first forming mould (M1) by means of the thread forming section (3c).

14. The method according to any preceding claim, wherein the directly preceding cellulose bottle (1 P) is a leading cellulose bottle (1 L) to the dry-formed cellulose bottle (1 ), and wherein the directly following cellulose bottle (1 F) is a trailing cellulose bottle (1T) to the dry-formed cellulose bottle (1 ).

15. A bottle forming unit (U) for dry-forming at least a part of a cellulose bottle (1 ) from an air-formed cellulose blank structure (2), wherein the bottle forming unit (U) comprises a feeding unit (F), a shaping unit (S) and a pressure lance (5), wherein the shaping unit (S) is configured for shaping the dry-formed cellulose blank structure (2) into a shaped cellulose blank structure (23) having a tube-like configuration with an inner surface (2a) and an outer surface (2b), wherein the shaping unit (S) comprises a forming shoulder (10) comprising an upper surface (12) and a forming through channel (11), wherein the forming shoulder (10) comprises a transition portion (13) between the upper surface (12) and the through channel, wherein the shaping unit (S) is configured to guide the cellulose blank structure (2) when fed to the forming unit (S) over the upper surface (12) then into the transition portion (13) and then into the forming through channel (11) and around the pressure lance (5) extending through the forming through channel (11).

16. The bottle forming unit (U) according to claim 15, wherein the shaping unit (S) is configured to allow the guiding of the cellulose blank structure (2) over the upper surface (12) perpendicular to the through channel (11) or at an angle to the through channel (11).

17. The bottle forming unit (U) according to claim 15 or 16, wherein the forming through channel (11) comprises an open and overlapping portion (14) extending in the feeding direction of the cellulose blank structure (2), wherein the overlapping portion (14) is configured to guide the cellulose blank structure (2) into a folded and overlapping manner along an extension of the tube-like configuration with the inner surface (2a) overlapping the outer surface (2b) when the cellulose blank structure is fed and guided into and through the forming through channel (11) and around the pressure lance (5) extending through the forming through channel (11).

18. The bottle forming unit (U) according to any one of claims 15-17, wherein the at least a part of the dry-formed cellulose bottle (1) comprises a neck portion (1a), a semi-closed bottom portion (1c), and a mid-portion (1b) arranged between the semi-closed bottom portion (1c) and the neck portion (1a), wherein the mid-portion (1 b) is arranged in fluid communication with the neck portion (1 a), wherein the bottle forming unit (U) comprises a first forming mould (M1), wherein the feeding unit (F) is configured for feeding the shaped cellulose blank structure (23) to the first forming mould (M1), wherein the first forming mould (M1) is configured for forming a neck portion (1a) of a leading cellulose bottle (1L) simultaneously with forming a semi-closed bottom portion (1c3) of a directly following trailing cellulose bottle (1T) from the shaped cellulose blank structure (23).

19. The bottle forming unit (U) according to claim 18, wherein the first forming mould (M1) comprises openable and closable first mould parts (3a,3b) arranged around a pressure lance (5), wherein a first forming cavity (C1) is formed between the first mould parts (3a,3b) and the pressure lance (5), wherein the feeding unit (F) is configured for feeding the shaped cellulose blank structure (23) around the pressure lance (5) and through the first mould parts (3a,3b) when the first mould parts (3a,3b) are open, wherein the first mould parts (3a,3b) when closed are configured for pressing the shaped cellulose blank structure (23) against the pressure lance (5) for simultaneously forming the neck portion (1a) and the semi-closed bottom portion (1c3) in the first forming cavity (C1).

20. The bottle forming unit (U) according to claim 18 or 19, wherein the bottle forming unit (U) further comprises a second forming mould (M2), wherein the feeding unit (F) is configured for feeding a formed semi-closed bottom portion (1 cs) and an intermediate section (Sim) of the shaped cellulose blank structure (23) between the formed semi-closed bottom portion (1cs) and a directly following formed trailing neck portion (1aT) to the second forming mould (M2), wherein the second forming mould (M2) is configured for forming the mid-portion (1b) from the intermediate section (Sim) and forming the closed bottom portion (1c) from the semi- closed bottom portion (1cs).

21. The bottle forming unit (U) according to claim 20, wherein the second forming mould (M2) comprises openable and closable second mould parts (4a,4b) forming a second forming cavity (C2), wherein a flexible membrane (6) connected to and arranged in fluid communication with the pressure lance (5) is arranged in the second forming cavity (C2), wherein the feeding unit (F) is configured for feeding the semi-closed bottom portion (1cs) and the intermediate section (Sim) around the pressure lance (5) into the second forming mould (M2) when the first mould parts (3a,3b) and the second mould parts (4a,4b) are open, wherein the second mould parts (4a,4b) together with theflexible membrane (6), when the second mould parts (4a,4b) are closed around the semi-closed bottom portion (1 cs) and the intermediate section (Sim), are configured forforming the closed bottom portion (1c) and the mid-portion (1c) by inflating the flexible membrane (6) with a pressure medium (P) entering from the pressure lance (5), wherein the semi-closed bottom portion (1cs) and the intermediate section (Sim) are pressed against the second mould parts (4a,4b) by means of the inflated flexible membrane (6).

22. The bottle forming unit (U) according to claim 21, wherein the pressure lance (5) is extending to or partly into the second forming cavity (C2).

23. The bottle forming unit (U) according to claim 21 or 22, wherein the bottle forming unit (U) comprises a fluid control device (D), wherein the pressure lance (5) at a first end (5a) is arranged in fluid communication with the fluid control device (D), and wherein the pressure lance (5) at a second end (5b) is arranged in fluid communication with the flexible membrane (6), wherein the fluid control device (D) is configured for inflating the flexible membrane (6) with the pressure medium (P) via the pressure lance (5).

24. The bottle forming unit (U) according to any of claims 20 to 23, wherein the bottle forming unit (U) further comprises a cutting device (7) arranged in the second mould part (M2) or in connection to the second mould part (M2), wherein the cutting device (7) is configured for cutting off the formed neck portion (1a) of a leading cellulose bottle (1L) from the semi-closed bottom portion (1cs) of a directly following trailing cellulose bottle (1T) by means of the cutting device (7) during the forming of the cellulose bottle (1) in the second forming mould (M2).

25. The bottle forming unit (U) according to any of claims 15 to 24, wherein the first forming mould (M1) comprises a thread forming section (3c) configured for forming a threaded section (1d) of the neck portion (1a) upon forming of the neck portion (1a) in the first forming mould (M1).

26. A dry-formed cellulose bottle (1 ), wherein the cellulose bottle (1) has an extension in a longitudinal direction (DLO) and comprises a neck portion (1a), a closed bottom portion (1c), and a mid-portion (1b) arranged in the longitudinal direction (DLo) between the closed bottom portion (1c) and the neck portion (1a), wherein the mid-portion (1b) is arranged in fluid communication with the neck portion (1a), wherein the cellulose bottle (1) comprises a compressed seam section (1e), wherein the seam section (1e) is extending along the cellulose bottle (1) through the neck portion (1a), the mid-portion (1b), and the closed bottom portion (1c).

27. The dry-formed cellulose bottle (1) according to claim 26, wherein the seam section (1e) is extending in the longitudinal direction (DLo) of the cellulose bottle (1), or extending essentially in the longitudinal direction (DLo) of the cellulose bottle (1 ).

28. The dry-formed cellulose bottle (1) according to claim 26 or 27, wherein the seam section (1e) of the neck portion (1a) has a higher basis weight compared to at least adjacent parts of the neck portion (1a) outside the seam section (1e), wherein the seam section (1e) of the mid-portion (1 b) has a higher basis weight compared to at least adjacent parts of the mid-portion (1 b) outside the seam section (1e), and wherein the seam section (1e) of the closed bottom portion (1c) has a higher basis weight compared to at least adjacent parts of the closed bottom portion (1c) outside the seam section (1e).

29. The dry-formed cellulose bottle (1) according to any of claims 26 to 28, wherein the neck portion (1a) comprises a smooth inner surface (1a|) and an outer surface (1aou) arranged with a threaded section (1d).

30. The dry-formed cellulose bottle (1) according to any of claims 26 to 29, wherein the cellulose bottle (1) comprises a shaped air-formed cellulose blank structure (23).

31. The dry-formed cellulose bottle (1) according to any of claims 26 to 29, wherein the closed bottom portion (1c) comprises a centrally arranged closed collar section (1 cc) of compressed cellulose fibres.

32. The dry-formed cellulose bottle (1) according to claim 31, wherein the closed collar section (1cC) is positioned at a distance above one or more lowest part (1cL) of the closed bottom portion (1c) in the longitudinal direction (DLo).

33. The dry-formed cellulose bottle (1) according to any of claims 26 to 32, wherein the neck portion (1a) has a higher average basis weight compared to the mid- portion (1b), and wherein the closed bottom portion (1c) has a higher average basis weight compared to the mid-portion (1 b).