SE545309C2

SE545309C2 - Forming mould system and method for forming three-dimensional cellulose products

Info

Publication number: SE545309C2
Application number: SE1851373A
Authority: SE
Inventors: Linus Larsson; Ove Larsson
Original assignee: Pulpac AB
Priority date: 2018-11-05
Filing date: 2018-11-05
Publication date: 2023-06-27
Also published as: SE1851373A1

Abstract

A forming mould system (1) for forming three-dimensional cellulose products (2) from an air-formed cellulose blank (3), comprising a forming mould (4) having a first mould part (5a), a second mould part (5b), a forming cavity (6), and a deformation element (7), wherein the first mould part (5a) and the second mould part (5b) are movable in relation to each other in a pressing direction (DP) and arranged to be pressed in relation towards each other during forming of the cellulose products (2), wherein the forming cavity (6) is formed and enclosed by the first mould part (5a) and the second mould part (5b) during forming of the cellulose products (2), and wherein the deformation element (7) during forming of the cellulose products (2) is arranged in the forming cavity (6) and is exerting a forming pressure (PF) on the cellulose blank (3), wherein a gap (G) is formed between the first mould part (5a) and the second mould part (5b) during forming of the cellulose products (2), wherein the system (1) further comprises a seal (8), wherein the seal (8) is sealing the gap (G) between the first mould part (5a) and the second mould part (5b) during forming of the cellulose products (2).

Description

FORMING MOULD SYSTEM AND METHOD FOR FORMING THREE- DIMENSIONAL CELLULOSE PRODUCTS TECHNICAL FIELD The present disclosure relates to a forming mould system for forming three- dimensional cellulose products from an air-formed cellulose blank, comprising a forming mould having a first mould part, a second mould part, a forming cavity, and a deformation element. The deformation element is during forming of the cellulose products arranged to exert a forming pressure on the cellulose blank. The disclosure further relates to a method for forming three-dimensional cellulose products from an air-formed cellulose blank.

BACKGROUND Cellulose fibres are often used as raw material for producing or manufacturing products. Products formed of cellulose fibres can be used in many different situations where there is a need for having sustainable products. A wide range of products can be produced from cellulose fibres and a few examples are disposable plates and cups, blank structures and packaging materials. Packages produced from cellulose fibres may for example be used for packaging of liquids, dry materials and other types of goods, where the packaging may be made in a three-dimensional shape or formed into a three- dimensional shape from a two-dimensional sheet material.

Forming moulds are commonly used when manufacturing cellulose products from raw materials including cellulose fibres, and traditionally the cellulose products have been produced with wet-forming techniques. A material commonly used for cellulose fibre products is moulded pulp. Moulded pulp has the advantage of being considered as a sustainable packaging material, since it is produced from biomaterials and can be recycled after use. As a consequence moulded pulp has been quickly increasing in popularity for different applications. Moulded pulp articles 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 techniques there is a need for drying of the moulded product, which is a time and energy consuming production step. 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, 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 recent development in the field of producing cellulose products is the forming of cellulose fibres without using wet-forming techniques. lnstead of forming the cellulose products from a liquid or semi liquid pulp suspension or slurry, an air-formed cellulose blank is used. The air-formed cellulose blank is inserted into a forming mould comprising a deformation element and during the forming of the cellulose products, the cellulose blank is subjected to a high forming pressure and a high forming temperature. The high forming pressure is demanding specific tolerances when constructing the forming mould when the deformation element is exerting the high forming pressure on the cellulose blank. There is a risk when forming the cellulose products that the deformation element is damaged or that an even pressure distribution on the cellulose blank is insufficient, which could result in products with poor quality.

There is thus a need for an improved forming mould system and method for forming cellulose products in a forming mould with a deformation element, where the cellulose products are produced from an air-formed cellulose blank, and where the products can be manufactured with high precision and with a high quality, and where the production is cost-efficient and rational.

SUMMARY An object of the present disclosure is to provide a forming mould system and a method for forming three-dimensional cellulose products from an air-formed cellulose blank 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 forming mould system.

The disclosure concerns a forming mould system according to cåašm "fier farmiag---th-reeaimerfsäenal---seäfulose---products--train----aif---a-iißfermed-»tseiluiese an:äf--arranged--te-be»pre-seed--âin--rfeiatien»-tewarešs--eaeh--attter»du-ršng--ferrrifšrtg--ef the--eeiEHiesfe--predslets;--wherein»the-fa»rming--eavity--is--f-errffaed--and-»enslesed--by Advantages with these features are that an efficient forming of the cellulose products can be achieved with the forming mould system. The forming mould is demanding specific tolerances when the deformation element is exerting the forming pressure on the cellulose blank, and the seal is securing that the gap is efficiently sealed. The sealing of the gap is ensuring an even pressure distribution in the forming process from the deformation element and a high durability of the deformation element. The efficient sealing of the gap is preventing that the deformation element is damaged in the forming process.

The even pressure distribution exerted on the cellulose blank by the deformation element is resulting in products manufactured with high precision and high quality. This also leads to a production of cellulose products that is cost-efficient and rational.

According to another aspect of the disclosure, the forming mould system further comprises the cellulose blank, and wherein during forming of the cellulose products the seal is formed by the cellulose blank arranged in the forming cavity between the first mould part and the second mould part. During the forming of the cellulose products in the forming mould the cellulose blank is positioned in the forming mould so that the gap is covered by the cellulose blank. The cellulose blank can in this way seal the gap during the forming process and establish an efficient sealing function so that a high pressure forming operation is achieved. To use the cellulose blank as the seal, a simple and efficient seal is achieved with the cellulose blank material being present in the forming operation. ïhe cellulose blank 3 has a material composition of 70-99.9% dry wt cellulose fibres and 0.1-30% dry wt of one or more additives, preferably 80-99.9% dry wt cellulose fibres and 0.1-20% dry wt of one or more additives, more preferably 90-99.9% dry wt cellulose fibres and 0.1 -1 0% dry wt of one or more additives. These material compositions are providing an efficient sealing function in the forming mould.

According»-te-»an---aspeet---e-f---tife--diselestæafey--tïhe seal is during forming of the cellulose products formed by the deformation element arranged in the forming cavity between the first mould part and the second mould part. The deformation element is when being deformed sealing the gap, wherein a high pressure forming can be achieved. To use the deformation element as the seal, a simple and efficient construction of the forming mould system is achieved.

According to an aspect of the disclosure, the seal is during forming of the cellulose products formed by a sealing element arranged between the first mould part and the second mould part. The sealing element is establishing a seal between the first mould part and the second mould part during forming of the cellulose products, wherein the gap is efficiently sealed.

According to an aspect of the disclosure, the sealing element is made of an elastomeric material. The elastomeric material is establishing an efficient seal between the mould parts.

According to an aspect of the disclosure, the first mould part comprises a first cutting edge and the second mould part comprises a second cutting edge, wherein the first cutting edge and the second cutting edge are arranged to cooperate to cut the cellulose blank. The cutting edges are providing an efficient way of cutting the cellulose blank into a desired shaped during the forming process. ln this way the cellulose blank may have any shape when arranged in the forming mould and when being pushed into the forming mould the cellulose blank is cut into a shape suitable for the cellulose products to be produced.

According to another aspect of the disclosure, the first mould part comprises an outer wall section, and the second mould part comprises a second side wall with an inner wall section. The outer wall section and the inner wall section are during forming of the cellulose products arranged to at least partly overlap each other, establishing an overlapping section in the pressing direction. The outer wall section and the inner wall section in the overlapping section have corresponding peripheral shapes in any plane perpendicular to the pressing direction. With this configuration, a simple construction of the forming mould is achieved, where the mould parts are designed with cooperating shapes for an efficient forming process.

According to a further aspect of the disclosure, the gap has an extension in a direction perpendicular to the pressing direction between the outer wall section and the inner wall section in the overlapping section. The gap is thus formed between the first mould part and the second mould part in a direction perpendicular to the pressing direction, which is providing a design of the forming mould where it is possible to have a gap with small dimensions in order to achieve an efficient forming of the cellulose products with desired temperatures and pressure levels. ïhe first mould part comprises an inner wall section, and the second mould part comprises a second side wall with an outer wall section. The inner wall section and the outer wall section are, during forming of the cellulose products, arranged to at least partly overlap each other, establishing an overlapping section in the pressing direction. The inner wall section and the outer wall section in the overlapping section have corresponding peripheral shapes in any plane perpendicular to the pressing direction. With this configuration, a simple construction of the forming mould is achieved, where the mould parts are designed with cooperate shapes for an efficient forming process.

Ihe gap has an extension in a direction perpendicular to the pressing direction between the inner wall section and the outer wall section in the overlapping section. The gap is thus formed between the first mould part and the second mould part in a direction perpendicular to the pressing direction, which is providing a design of the forming mould where it is possible to have a gap with small dimensions in order to achieve an efficient forming of the cellulose products with desired temperatures and pressure levels.

According to an aspect of the disclosure, wherein the gap has a width in a direction perpendicular to the pressing direction with a smallest dimension in the range 0.005-5 mm. With these smallest dimensions an efficient forming of the cellulose products is achieved.

According to another aspect of the disclosure, the outer wall section of the first mould part comprises a first cutting edge and the inner wall section of the second side wall comprises a second cutting edge, or the inner wall section of the first mould part comprises a first cutting edge and the outer wall section of the second side wall comprises a second cutting edge, wherein the first cutting edge and the second cutting edge are arranged to cooperate to cut the cellulose blank. With this arrangement of the cutting edges, the cellulose product can be cut into a desired shape directly in the forming process from the cellulose blank.

According to a further aspect of the disclosure, the first mould part comprises a lower surface and the second side wall comprises an upper wall section, and wherein the gap has an extension in the pressing direction between the lower surface and the upper wall section. The gap is thus formed between the first mould part and the second mould part in the pressing direction, which is providing a design of the forming mould where it is possible to have a gap with small dimensions in order to achieve an efficient forming of the cellulose products with desired temperatures and pressure levels.

According to an aspect of the disclosure, the gap has a width in the pressing direction with a smallest dimension in the range 0.005-5 mm. With these smallest dimensions an efficient forming of the cellulose products is achieved. ïhe deformation element is during forming of the cellulose products arranged to exert an isostatic forming pressure on the cellulose blank. The isostatic pressure from the deformation element is establishing a uniform pressure in all directions in the forming mould on the cellulose blank. ln this way an efficient forming of the cellulose products is achieved, and the cellulose products can be produced with high quality.

Quring forming of the cellulose products the deformation element through deformation is arranged to establish a uniform pressure in all directions in the forming mould on the cellulose blank, wherein the deformation element during forming of the cellulose products is exerting an isostatic forming pressure on the cellulose blank in the range 1- 100 MPa. This pressure range is with the isostatic forming pressure providing an efficient forming of the cellulose products.

According to an aspect of the disclosure, the deformation element is releasably attached to the first mould part or the second mould part. With this configuration of the forming mould, the deformation is easy to remove and attach when needed. During forming of the cellulose products, the deformation element may become degraded or worn out, and to achieve an efficient forming process an easy replacement of the deformation element is needed.

According to another aspect of the disclosure, the deformation element is made of a structure of elastomeric material, or a flexible membrane and a pressing fluid. By using a structure of elastomeric material a relatively simple and cheap construction of the deformation element is achieved, where the deformation element can be designed with shapes that efficiently distributes the pressure in the forming cavity. By using a flexible membrane and a pressing fluid, a deformation element that is adaptable to different mould shapes is achieved.

According to an aspect of the disclosure, the deformation element is made of a massive structure of silicone rubber or rubber with a hardness in the range 20-90 Shore A. These material alternatives are suitable for the deformation element, and the hardness within the range is providing a deformation element with properties suitable for forming cellulose products with high pressure.

According to another aspect of the disclosure, the forming mould system further comprises a heating device arranged in relation to the first mould part and/or the second mould part, wherein during forming of the cellulose products the first mould part and/or the second mould part is heated to a forming mould temperature in the range 100°C to 500°C. The arrangement of the heating device in relation to the forming mould is providing a simple and reliable heating function of the forming mould.

According to an aspect of the disclosure, the forming mould system further comprises a pressing unit arranged to apply a pressure on the first mould part and/or the second mould part, wherein during forming of the cellulose products the deformation element is exerting a forming pressure on the cellulose blank in the range 1-100 MPa. The pressing unit is applying the pressure on the mould parts needed for forming the cellulose products. The pressure levels needed for an efficient forming of the cellulose products are within the range 1-100 MPa, and within this range the deformation element is deformed in the forming mould for an efficient forming of the cellulose products.

The disclosure further concerns a method for forming three-dimensional cellulose products from an air-formed cellulose blank in a forming mould system according to ciaim "i4,--wherein--trte--system-e-ernprfâses--a--f-eafnningf-rn-euid tt-äe--eeilu-iese--bredtalets,--wherein--the-deferrrifatâen--eieraent--durâng--ferra-irag-ef--trre seåtal-ese-predusts--is--a-rraifiged»in--the--feifrïfaing-eæwityæ--wherein--a-gap--is--ferrïfaeei part-dering-f-eafraingr-ef--tite--eeiEulese--preduets_ BRIEF DESCRIPTION OF DRAWINGS The disclosure will be described in greater detail in the following, with reference to the attached drawings, in which Fig.

Fig.

Fig. 2a-f 3a-b 4a-b shows schematically, a forming mould system in a perspective view according to the disclosure, show schematically, in a first embodiment that does not torrt: oart of the invoration, cross-sectional side views and views from above of a forming mould according to the disclosure, show schematically, in a second embodiment that does not form gart of the šrwefttioo, cross-sectional side views of the forming mould according to the disclosure, show schematically, in a third embodiment, cross-sectional side views of the forming mould according to the disclosure, shows schematically, in a fourth embodiment that does :tot 'form gart of the änventiort, a cross-sectional side view of the forming mould according to the disclosure, shows schematically, in a fifth embodiment, a cross-sectional side view of the forming mould according to the disclosure, shows schematically, in a sixth embodiment that does mot form ggart of the intfeotiost, a cross-sectional side view of the forming mould according to the disclosure, shows schematically, in a seventh embodiment, a cross-sectional side view of the forming mould according to the disclosure, shows schematically, in an eight embodiment that does not form ggart of the šrwentiort, a cross-sectional side view of the forming mould according to the disclosure, shows schematically, in a ninth embodiment that does not form ggart of the intfeotiost, a cross-sectional side view of the forming mould according to the disclosure,Fig. 11 shows schematically, in a tenth embodiment that does not forrn part of the inveotiort, a cross-sectional side view of the forming mould according to the disclosure, Fig.12 shows schematically, a cross-section of an alternative embodiment of a deformation element according to the disclosure that does not form part of the šotfertttors, Fig. 13a-b show schematically, cross-sectional side views of a forming mould with alternative embodiments of seals according to the disclosure that does not form oazt ot the irwontion, Fig 14a-j show schematically, enlarged cross sectional side views of gaps shown in figures 2d, 3b, 4b, and 5-11 according to the disclosure, and Fig. 15 shows schematically, a deformation element titat does not form part ot the ioventšon exerting an isostatic forming pressure according to the disclosure.

DESCRIPTION OF EXAMPLE EMBODIMENTS 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.

Figure 1 schematically shows in a perspective view a forming mould system 1 forforming three-dimensional cellulose products 2 from an air-formed cellulose blank.

With a cellulose blank is meant a fibre web structure produced from cellulose fibres. With air-forming of the cellulose blank is meant the formation of acellulose blank in a dry-forming process in which cellulose fibres are air-formed to produce the cellulose blank. When forming the cellulose blank in the air- forming process, the cellulose fibres are carried and formed to the fibre blank structure 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 product, but air is still used as carrying medium in the forming process. The cellulose blank may have a dryness that is mainly corresponding to the ambient humidity in the atmosphere surrounding the dry- formed cellulose blank.

As shown in the figures, the forming mould system 1 comprises a forming mould 4, where the forming mould 4 is having a first mould part 5a, a second mould part 5b, a forming cavity 6, and a deformation element 7. The deformation element 7 is during forming of the cellulose products 2 arranged to exert a forming pressure PF on the cellulose blank 3. During the forming, the deformation element 7 is deformed to exert a pressure on the cellulose blank 3 and through the deformation an even pressure distribution is achieved in the forming mould 4, even if the cellulose products 2 are having complex three- dimensional shapes or if the cellulose blank 3 is having a varied thickness.

The cellulose blank 3 may be formed of cellulose fibres in a conventional dry- forming process and be configured in different ways. For example, the cellulose blank 3 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, depending on the desired properties of the cellulose products 2. The cellulose fibres used in the cellulose blank 3 are during the forming of the cellulose products 2 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 ofcellulose fibres, such as natural cellulose fibres or manufactured cellulose fibres.

The cellulose blank 3 may comprise one or more additives that are altering the mechanical, hydrophobic, and/or oleophobic properties of the cellulose products 2. Tests have shown that if the cellulose blank 3 contains at least 70% of cellulose fibres, desired mechanical properties of the cellulose product 2 can be achieved. ln order to achieve the desired properties of the formed cellulose products 2, the cellulose fibres should be strongly bonded to each other through fibril aggregation in a way so that the resulting cellulose products 2 will have good mechanical properties. The additives used may therefore not impact the bonding of the cellulose fibres during the forming process to a high extent.

As a non-limiting example, the cellulose blank 3 may have a material composition of 70-99.9% dry wt cellulose fibres and 0.1 -30% dry wt of the one or more additives. ln another embodiment, the cellulose blank 3 may have a material composition of 80-99.9% dry wt cellulose fibres and 0.1-20% dry wt of the one or more additives. ln a further embodiment, the cellulose blank 3 may have a material composition of 90-99.9% dry wt cellulose fibres and 0.1- 10% dry vvt of the one or more additives. Depending on the amount of cellulose fibres and additives used in the cellulose blank 3, the cellulose products 2 can have different properties.

The one or more additives of the cellulose blank 3 may as a non-limiting example be starch compounds, rosin compounds, butanetetracarboxylic acid, gelatin compounds, alkyl ketene dimer (AKD), Alkenyl Succinic Anhydride (ASA), and/or flourocarbons. These additives are commonly used in the forming of cellulose products and are therefore not described in detail. Starch compounds, gelatin compounds, butanetetracarboxylic acid, and fluorocarbons may for example be used for altering the mechanical properties, such as strength or stiffness, of the cellulose product. Rosin compounds, alkyl ketene dimer (AKD), Alkenyl Succinic Anhydride (ASA), and fluorocarbonsmay for example be used for altering the hydrophobic properties of the cellulose products. Fluorocarbons may for example be used also for altering the oleophobic properties of the cellulose product. The one or more additives of the cellulose blank 3 may be added to the cellulose blank 3 before forming the cellulose products, for example when dry-forming the cellulose blank The cellulose blank 3 may have a single-layer or a multi-layer structure. A cellulose blank 3 having a single-layer structure is referring to a cellulose blank structure that is formed of one layer containing cellulose fibres. A cellulose blank 3 having a multi-layer structure is referring to a cellulose blank structure that is formed of two or more layers containing cellulose fibres, where the layers may have the same or different compositions or configurations. ln order to form the cellulose products 2, the cellulose blank 3 is arranged in the forming mould 4, where the cellulose blank 3 is heated to a specific forming temperature and pressed with a specific forming pressure PF in the forming cavity 6 of the forming mould 4. When forming the cellulose products 2, a force F is applied to the first forming mould part 5a and/or the second forming mould part 5b, as illustrated in the figures. The applied force F is during the forming process establishing the forming pressure PF in the forming cavity 6 exerted on the cellulose blank 3. According to the disclosure, when forming the cellulose blank 3 in the forming mould 4, a forming pressure PF in the range 1- 100 MPa and a forming temperature TF in the range of 100°C to 300°C are applied to the cellulose blank 3. The cellulose fibres in the cellulose blank 3 will in the forming process be bonded to each other in a way so that the resulting cellulose products 2 will have good mechanical properties. Tests have shown that higher forming temperatures will give stronger bonding between the cellulose fibres when being pressed at a specific forming pressure. With forming temperatures above 100°C together with a forming pressure of at least 1 MPa, the cellulose fibres will be strongly bonded to each other with hydrogen bonds. A higherforming temperature will increase the fibril aggregation, water resistance, Young's modulus and the mechanical properties of the final cellulose product. The high pressure is important for fibril aggregation between the cellulose fibres in the cellulose products 2. At temperatures higher than 300°C, the cellulose fibres will be thermally degraded and therefore temperatures above 300°C should be avoided. The forming pressure and the forming temperature may be chosen to be suitable for the specific cellulose products 2 to be produced.

Tests have shown that when forming the cellulose products 2 from cellulose blanks 3, suitable forming pressure levels are, as described above, in the range of 1-100 MPa, and suitable forming temperature levels are in the range of 100°C to 300°C. However, pressure levels in the range of 4-20 MPa, and temperature levels in the range of 140°C to 200°C are often sufficient in order to achieve cellulose products 2 with desired properties.

The cellulose products 2 may be formed in the forming mould 4 during a forming time period in a range of 0.001 to 20 seconds. As an alternative, the forming time period may be in a range of 0.01 to 15.0 seconds or in a range of 0.1 to 10.0 seconds. The time period is chosen so that the desired properties of the cellulose products 2 are achieved. Longer forming time periods can be needed if the multi-layer cellulose blank 3 is heated in the forming mould 4, compared to a pre-heated cellulose blank By holding a specific forming pressure at a specific forming temperature for a certain period of time, the fibril aggregation in the cellulose fibres of the cellulose blank 3 will form the cellulose products 2, with a cellulose fibre structure having mechanical properties similar to thermoplastic materials. lf as a non-limiting example, the forming pressure is 4 MPa, the forming temperature is 150°C, and the forming time period is 5 seconds, cellulose products 2 with a fibre structure with mechanical properties close to thermoplastic materials can be achieved. The forming time period may as described above for example range from 0.001 seconds to several seconds, depending on the forming temperature of the cellulose blank 3 and the forming pressure applied to the cellulose blank 3 in the forming mouldThe dry forming of the cellulose blank 3 may take place as a separate process step, in which the cellulose blank 3 may be stacked in sheets or arranged as a rolled web, before forming of the cellulose products 2. As an alternative, the dry forming of the cellulose blank 3 may be part of a continuous process, in which the cellulose products 2 are formed in the forming mould 4, and the dry forming of the cellulose blank 3 will then be an initial process step before arranging, heating, and pressing the cellulose blank 3 in the forming mould The heating of the cellulose blank 3 may take place before the pressing in the forming mould 4 or at least partly before the pressing in the forming mould 4. As an alternative, the heating of the cellulose blank 3 may take place in the forming mould 4 when being pressed. The heating of the cellulose blank 3 may for example be accomplished through heating the forming mould 4 before pressing the cellulose blank 3. The pressure may also be applied before heating the cellulose blank 3, and for example the heating of the cellulose blank 3 may take place in the forming mould 4 during pressing.

The cellulose blank 3 may be arranged into the forming mould 4 in any suitable way, and as an example, the cellulose blank 3 may be manually arranged in the forming mould 4. Another alternative is to arrange a feeding device for the cellulose blank 3, which is transporting the cellulose blank 3 to the forming mould 4. The feeding device could for example be a conveyor belt, an industrial robot, or any other suitable manufacturing equipment. lf the dry forming of the cellulose blank 3 is part of a continuous manufacturing process in which the cellulose product is produced, the cellulose blank 3 may be fed to the forming mould 4 from a dry forming unit. More specifically, the cellulose blank 3 could be intermittently fed to the forming mould 4 by a feeding unit if desired.

The first mould part 5a and the second mould part 5b are movably arranged in relation to each other in a pressing direction Dp and further arranged to be pressed in relation towards each other during forming of the cellulose products 2 with the force F that may vary during the forming process and depend on the type of cellulose products 2 formed and the forming equipment used. Whenforming the cellulose products 2, the cellulose blank 3 is first arranged in the forming mould 4 when the forming mould is in an open state between the first mould part 5a and the second mould part 5b. The forming cavity 6 is arranged with a shape that is corresponding to the final shape of the cellulose products 2 that are formed in the forming mould 4, and the cellulose blank 3 is arranged in a way in the forming mould 4 so that during the forming the forming cavity 6 fully or partly is covered by the cellulose blank 3. When the cellulose blank 3 is arranged in the forming mould 4, the first mould part 5a and the second mould part 5b are moved in relation to each other during the forming process.

The forming mould system 1 can for example be constructed so that the first mould part 5a or the second mould part 5b is movable and arranged to move towards the other mould part during the forming process, where the other mould part is stationary or non-movably arranged. ln an alternative solution, both the first mould part 5a and the second mould part 5b are movably arranged, where the first mould part 5a and the second mould part 5b are displaced in directions towards each other during the forming process. The moving mould part or alternatively moving mould parts may be displaced with a suitable actuator, such as a hydraulic, pneumatic, or electric actuator. A combination of different actuators may also be used. The relative speed between the first mould part 5a and the second mould part 5b during the forming process is chosen so that the cellulose blank 3 is evenly distributed in the forming cavity 6 during the forming process. The actuator or actuators used for moving the first mould part 5a, or alternatively the second mould part 5b, or both mould parts may for example be pressure controlled, wherein the relative movement of the first mould part 5a in relation to the second mould part 5b is stopped when the correct forming pressure is established in the forming mould. ln figures 2a-f, a first embodiment of the forming mould 4 of the forming mould system 1 is shown. ln figures 2a-d, the forming mould 4 is shown in cross- sectional side views of different forming steps of the forming process. ln figure2e, the forming mould 4 is shown in a view from above, and in figure 2f, the forming mould 4 is shown in a cross-sectional view from above along the plane P indicated in figure 2d. ln the first embodiment, the first mould part 5a comprises a first side wall 11, an upper surface 10a, and a lower surface 10b. The first side wall 11 comprises an outer wall section 11a that is surrounding the first mould part 5a. The deformation element 7 is attached to the lower surface 10b of the first mould part 5a with suitable attachment means, such as for example glue or mechanical fastening members. The second mould part 5b has a second side wall 12 with an outer wall section 12a, an inner wall section 12b, and an upper wall section 12c. The second mould part 5b has further a bottom wall 16 with an outer wall section 16a and an inner wall section 16b. ln this embodiment, the forming cavity 6 is arranged in the second mould part 5b and delimited by the inner wall section 12b of the second side wall 12 and the inner wall section 16b of the bottom wall ln the embodiment shown in figures 2a-f, the first mould part 5a is movably arranged in the pressing direction Dp and the second mould part 5b is stationary. The first mould part 5a and the second mould part 5b may be arranged in a suitable stand or frame structure to hold the mould parts, as shown schematically in figure 1, and an actuator arrangement may be used for moving the first mould part 5a. When forming the cellulose products 2, the cellulose blank 3 is arranged between the first mould part 5a and the second mould part 5b when the forming mould is in an open state, as shown in figure 2a. The cellulose blank 3 is in this embodiment arranged in a way between the first mould part 5a and the second mould part 5b so that an opening 6a of the forming cavity 6 is covered by the cellulose blank 3. When the cellulose blank 3 is arranged in the forming mould 4 as described above, the first mould part 5a and the second mould part 5b are ready to be moved in relation to each other during the forming process. ln the forming step when the first mould part 5a is moving in a direction towards the second mould part 5b, the deformationelement 7 is pushing the cellulose blank 3 into the forming cavity 6, as illustrated in figure 2b. When the deformation element 7 is moving further into the forming cavity 6 and pushing the cellulose blank 3 towards the inner wall section 16b of the bottom wall 16, the deformation element 7 is configured so that it is deformed when meeting the inner wall section 16b of the bottom wall 16 with the cellulose blank arranged between the deformation element 7 and the inner wall section 16b of the bottom wall 16, as illustrated in figure 2c. The deformation element 7 may also be designed and configured to deform in other ways if desired. ln the embodiment shown, through the configuration and deformation of the deformation element 7, the cellulose blank 3 is first pressed in a direction towards the inner wall section 16b of the bottom wall 16 and thereafter towards the inner wall section 12b of the second side wall 12. ln figures 2b and 2c intermediate steps in the forming process are shown, where the cellulose blank 3 is pushed into the forming cavity 6 by the deformation element 7. When the deformation element 7 is fully deformed, as shown in figure 2d, the forming of the cellulose product is taking place and the movement of the first mould part 5a in the pressing direction Dp towards the second mould part 5b is being stopped. When the forming of the cellulose product 2 from the cellulose blank 3 is completed, the first mould part 5a is moved in a direction away from the second mould part 5b, opposite the pressing direction Dp. When the forming mould 4 is moved into the open state, the formed cellulose product 2 is removed from the forming mould As shown in figure 2d, the forming cavity 6 is formed and enclosed by the first mould part 5a and the second mould part 5b during forming of the cellulose products 2. As described above, the, the forming cavity 6 is in this embodiment arranged in the second mould part 5b and delimited by the inner wall section 12b of the second side wall 12 and the inner wall section 16b of the bottom wall 16. During the forming process, the forming cavity 6 is further delimited by the lower surface 10b of the first mould part 5a, wherein the forming cavity is arranged as an enclosed volume in which the deformation element 7 is deformed, as shown in figure 2d. Thus, during forming of the cellulose products 2 the deformation element 7 is arranged in the forming cavity 6 and is exerting a forming pressure Pp on the cellulose blank As shown in figure 2d and 14a, a gap G is formed between the first mould part 5a and the second mould part 5b during forming of the cellulose products 2. The outer wall section 11a of the first side wall 11 and the inner wall section 12b of the second side wall 12 are during forming of the cellulose products 2 arranged to at least partly overlap each other, establishing an overlapping section S0 in the pressing direction Dp, as shown in figure 14a that does :tot form part ofthe inventioit. The outer wall section 11a and the inner wall section 12b in the overlapping section S0 have corresponding peripheral shapes in a direction parallel to any plane P perpendicular to the pressing direction Dp. ln this way, the gap G is established in the overlapping section S0 between the peripheries of the outer wall section 11a and the inner wall section 12b, and the gap G has an extension in a direction perpendicular to the pressing direction Dp between the outer wall section 11a and the inner wall section 12b in the overlapping section S0. The gap G may be arranged with a constant or essentially constant smallest dimension between the outer wall section 11a and the inner wall section 12b. The extension of the gap G in the direction perpendicular to the pressing direction Dp may vary depending on the type of cellulose products that are formed in the forming mould system 1. Test have shown that suitable size of the gap G is when the gap G has a width in a direction perpendicular to the pressing direction Dp with a smallest dimension in a range of 0.005-5 mm. With a smallest dimension is meant the smallest distance in a direction perpendicular to the pressing direction Dp between the outer wall section 11a of the first side wall 11 and the inner wall section 12b of the second side wall 12 in any point along the peripheries of the of the outer wall section 11a and the inner wall section 12b in any plane P in the overlapping section S0. ln the embodiment shown in figures 2a-d, the outer wall section 11a and the inner wall section 12b are arranged parallel oressentially parallel to each other. ln alternative configurations, the outer wall section 11a and the inner wall section 12b may be arranged non-parallel to each other or alternatively have curved or other non-Iinear shapes.

The forming mould system 1 further comprises a seal 8, wherein the seal 8 is sealing the gap G between the first mould part 5a and the second mould part 5b during forming of the cellulose products 2. The seal 8 can be arranged in different ways depending on the type of cellulose products 2 formed in the forming mould 4, and further depending on the design of the forming mould. ln the embodiment shown in figures 2d and 14a, the seal 8 is sealing the gap G, where the gap G as described above is having an extension in a direction perpendicuiar to the pressing direction Dp in the overiapping section So between the peripheries of the outer wall section 11a of the first side wall 11 and the inner wall section 12b of the second side wall 12. As shown in figures 2a-e, the forming mould system 1 further comprises the cellulose blank 3, and during forming of the cellulose products 2 the seal 8 is formed by the cellulose blank 3, where the cellulose blank 3 is arranged in the forming cavity 6 between the first mould part 5a and the second mould part 5b. The use of the cellulose blank 3 as the seal 8 is a highly efficient way of providing the sealing function between the first mould part 5a and the second mould part 5b. During the forming of the cellulose products 2 in the forming mould 4, the cellulose blank 3 is positioned in the forming mould 4 so that the gap G is covered by the cellulose blank 3, as shown in figure 2d and 14a. The cellulose blank 3 can in this way seal the gap G during the forming process and establish an efficient sealing function so that a high pressure forming operation is achieved. To use the cellulose blank 3 as the seal 8, a simple and efficient sealing function is accomplished, where the cellulose blank 3 if forming part of the forming mould system ln figure 2e, the forming mould 4 is shown in a view from above and in figure 2f, a cross-sectional view from above of the forming mould 4 is shown. ln the schematically shown embodiment, the forming cavity 6, the first mould part 5a,and the second mould part 5b are having rectangular-like shapes. However, the forming cavity 6 and mould parts may have any desired shapes, such as circular, oval, or other regular or other non-regular shapes, depending on the shape of the cellulose products 2 produced. ln figures 3a-b, a second embodiment of the forming mould 4 of the forming mould system 1 is shown. The first mould part 5a comprises a first side wall 11, an upper surface 10a, and a lower surface 10b. The first side wall 11 comprises an outer wall section 11a. The deformation element 7 is attached to the lower surface 10b of the first mould part 5a with suitable attachment means, such as for example glue or mechanical fastening members. The second mould part 5b has a second side wall 12 with an outer wall section 12a, an inner wall section 12b, and an upper wall section 12c. The second mould part 5b has further a bottom wall 16 with an outer wall section 16a and an inner wall section 16b. ln this embodiment, the forming cavity 6 is arranged in the second mould part 5b and delimited by the inner wall section 12b of the second side wall 12 and the inner wall section 16b of the bottom wall ln the embodiment shown in figures 3a-b, the first mould part 5a is movably arranged and the second mould part 5b is stationary. When forming the cellulose products 2, the cellulose blank 3 is arranged between the first mould part 5a and the second mould part 5b when the forming mould is in an open state, as shown in figure 3a. The cellulose blank 3 is arranged in a way between the first mould part 5a and the second mould part 5b so that the opening 6a of the forming cavity 6 is covered by the cellulose blank The forming process is performed in the same way and the different elements have the same functions as described in the first embodiment above. Through the deformation of the deformation element 7, the cellulose blank 3 is first pressed in a direction towards the inner wall section 16b of the bottom wall and thereafter towards the inner wall section 12b of the second side wall 12. When the deformation element is fully deformed, as shown in figure 3b, the forming of the cellulose product is taking place and the movement of the first mouldpart 5a in the pressing direction Dp towards the second mould part 5b is being stopped. As shown in figure 3b, the forming cavity 6 is formed and enclosed by the first mould part 5a and the second mould part 5b during forming of the cellulose products 2. As described above, the forming cavity 6 is in this embodiment arranged in the second mould part 5b and delimited by the inner wall section 12b of the second side wall 12 and the inner wall section 16b of the bottom wall 16. During the forming, the forming cavity is further delimited by the lower surface 10b of the first mould part 5a, wherein the forming cavity is arranged as an enclosed volume in which the deformation element 7 is deformed. Thus, during forming of the cellulose products 2 the deformation element 7 is arranged in the forming cavity 6 and is exerting a forming pressure PF on the cellulose blank As shown in figures 3b and 14b that does not form part of the invention, a gap G is formed between the first mould part 5a and the second mould part 5b during forming of the cellulose products 2. ln the embodiment shown in figures 3a-b, the gap G has an extension in the pressing direction Dp between the lower surface 10b of the first mould part 5a and the upper wall section 12c of the second side wall 12, where the second side wall 12 is arranged in the second mould part 5b. As shown in figures 3b and 14b, the gap G has an extension in the pressing direction Dp along the upper wall section 12c where the upper wall section 12c and the lower surface 10b are overlapping each other. The gap G may be arranged with a constant or essentially constant smallest dimension between the lower surface 10b and the upper wall section 12c. The extension of the gap G in the pressing direction Dp may vary depending on the type of cellulose products that are formed in the forming mould system 1. Test have shown that suitable size of the gap G is when the gap G has a width in the pressing direction Dp with a smallest dimension in the range 0.005-5 mm. With a smallest dimension is in this embodiment meant the smallest distance in the pressing direction Dp between the lower surface 10b of the first mould part 5a and the upper wall section 12c of the second side wall 12. ln this embodiment, the upper wall section 12c of the second side wall12 and the lower surface 10b ofthe first mould part 5a may, as shown in figures 3a-b have planar cross-sectional shapes. Alternatively, the upper wall section 12c and the lower surface 10b may have curved cross-sectional shapes, or any other suitable cross-sectional shape. ln the embodiments shown in figures 3a-b, the forming mould system 1 further comprises the cellulose blank 3, and during forming of the cellulose products 2 the seal 8 is formed by the cellulose blank 3, where the cellulose blank 3 is arranged in the forming cavity 6 between the first mould part 5a and the second mould part 5b. During the forming of the cellulose products 2 in the forming mould 4, the cellulose blank 3 is positioned in the forming mould 4 so that the gap G is covered by the cellulose blank 3, as shown in figure 3b. The cellulose blank 3 can in this way seal the gap G during the forming process and establish an efficient sealing function so that a high pressure forming operation is achieved. ln figures 4a-b, a third embodiment of the forming mould 4 of the forming mould system 1 is shown. The first mould part 5a comprises a first side wall 11, an upper surface 10a, and a lower surface 10b. The first side wall 11 comprises an outer wall section 11a, an inner wall section 11b and a lower wall section 11c. The deformation element 7 is attached to the lower surface 10b of the first mould part 5a with suitable attachment means, such as for example glue or mechanical fastening members. The second mould part 5b has a second side wall 12 with an outer wall section 12a, an inner wall section 12b, and an upper wall section 12c. The second mould part 5b has further a bottom wall 16 with an outer wall section 16a and an inner wall section 16b. ln this embodiment, the forming cavity 6 is arranged in the second mould part 5b and delimited by the inner wall section 12b of the second side wall 12 and the inner wall section 16b of the bottom wall ln the embodiment shown in figures 4a-b, the first mould part 5a is movably arranged and the second mould part 5b is stationary. When forming the cellulose products 2, the cellulose blank 3 is arranged between the first mould part 5a and the second mould part 5b when the forming mould is in an open state, as shown in figure 4a. The cellulose blank 3 is arranged in a way between the first mould part 5a and the second mould part 5b so that the opening 6a of the forming cavity 6 is covered by the cellulose blank The forming process is performed in the same way and the different elements have the same functions as described in the first embodiment above. Through the deformation of the deformation element 7, the cellulose blank 3 is first pressed in a direction towards the inner wall section 16b of the bottom wall and thereafter towards the inner wall section 12b of the second side wall 12. When the deformation element is fully deformed, as shown in figure 4b, the forming of the cellulose product is taking place and the movement of the first mould part 5a in a the pressing direction Dp towards the second mould part 5b is being stopped. As shown in figure 4b, the forming cavity 6 is formed and enclosed by the first mould part 5a and the second mould part 5b during forming of the cellulose products 2. As described above, the forming cavity 6 is in this embodiment arranged in the second mould part 5b and delimited by the inner wall section 12b of the second side wall 12 and the inner wall section 16b of the bottom wall 16. During the forming, the forming cavity is further delimited by the lower surface 10b of the first mould part 5a, wherein the forming cavity is arranged as an enclosed volume in which the deformation element 7 is deformed. Thus, during forming of the cellulose products 2 the deformation element 7 is arranged in the forming cavity 6 and is exerting a forming pressure PF on the cellulose blank As shown in figure 4b, a gap G is formed between the first mould part 5a and the second mould part 5b during forming of the cellulose products 2. ln this embodiment, the gap G is formed with an extension both between the inner wall section 11b of the first side wall 11 and the outer wall section 12a of the second side wall 12, and between the lower surface 10b of the first mould part 5a and the upper wall section 12c of the second side wall 12. ln this way the gap comprises a first gap section G1 and a second gap section GAs shown in figures 4b and 14c, the first gap section G1 is formed between the first mould part 5a and the second mould part 5b during forming of the cellulose products 2. The inner wall section 11b of the first side wall 11 and the outer wall section 12a of the second side wall 12 are during forming of the cellulose products 2 arranged to at least partly overlap each other, establishing an overlapping section S0 in the pressing direction Dp, as shown in figure 14c. The inner wall section 11b and the outer wall section 12a in the overlapping section S0 have corresponding peripheral shapes in any plane P perpendicular to the pressing direction Dp. ln this way, the first gap section G1 is established in the overlapping section S0 between the peripheries of the outer wall section 12a and the inner wall section 11b, and the first gap section G1 has an extension in a direction perpendicular to the pressing direction Dp between the inner wall section 11b and the outer wall section 12a in the overlapping section S0. The first gap section G1 may be arranged with a constant or essentially constant smallest dimension between the outer wall section 12a and the inner wall section 11b. The extension of the first gap section G1 in the direction perpendicular to the pressing direction Dp may vary depending on the type of cellulose products 2 that are formed in the forming mould system 1. Test have shown that suitable size of the first gap section G1 is when the gap G has a width in a direction perpendicular to the pressing direction Dp with a smallest dimension in a range of 0.005-5 mm. With a smallest dimension is meant the smallest distance in a direction perpendicular to the pressing direction Dp between the inner wall section 11b of the first side wall 11 and the outer wall section 12a of the second side wall 12 in any point along the peripheries of the of the inner wall section 11b and the outer wall section 12a in any plane P in the overlapping section S0. ln the embodiment shown in figures 4a-b and 14c, the inner wall section 11b and the outer wall section 12a are arranged parallel or essentially parallel to each other. ln alternative configurations, the inner wall section 11a and the outer wall section 12a may be arranged non-parallel to each other or alternatively have curved or other non-linear shapes.As shown in figures 4b and 14c, a second gap section G2 is formed between the first mould part 5a and the second mould part 5b during forming of the cellulose products 2. The second gap section G2 has an extension in the pressing direction Dp between the lower surface 10b of the first mould part 5a and the upper wall section 12c of the second side wall 12, where the second side wall 12 is arranged in the second mould part 5b. As shown in figures 4b and 14c, the second gap section G2 has an extension in the pressing direction Dp along the upper wall section 12c where the upper wall section 12c and the lower surface 10b are overlapping each other. The second gap section G2 may be arranged with a constant or essentially constant smallest dimension between the lower surface 10b and the upper wall section 12c. The extension of the second gap section G2 in the pressing direction Dp may vary depending on the type of cellulose products that are formed in the forming mould system 1. Test have shown that suitable size of the second gap section G2 is when the second gap section G2 has a width in the pressing direction Dp with a smallest dimension in the range 0.005-5 mm. With a smallest dimension is in this embodiment meant the smallest distance in the pressing direction Dp between the lower surface 10b of the first mould part 5a and the upper wall section 12c of the second side wall 12. ln this embodiment, the upper wall section 12c of the second side wall 12 and the lower surface 10b of the first mould part 5a may, as shown in figures 4a-b have planar cross-sectional shapes. Alternatively, the upper wall section 12c and the lower surface 10b may have curved cross-sectional shapes, or any other suitable cross-sectional shape. ln the embodiments shown in figures 4a-b, the forming mould system 1 further comprises the cellulose blank 3, and during forming of the cellulose products 2 the seal 8 is formed by the cellulose blank 3, where the cellulose blank 3 is arranged in the forming cavity 6 between the first mould part 5a and the second mould part 5b. During the forming of the cellulose products 2 in the forming mould 4, the cellulose blank 3 is positioned in the forming mould 4 so that the first gap section G1 and the second gap section G2 are covered by thecellulose blank 3, as shown in figure 4b. The cellulose blank 3 can in this way seal the gap G with the first gap section G1 and the second gap section G2 during the forming process and establish an efficient sea|ing function so that a high pressure forming operation is achieved.

The forming mould 4 may have other designs and constructions compared to the ones described above. ln figures 5-11, a fourth to a tenth embodiment of the forming mould 4 ofthe forming mould system 1 shown. ln the embodiments shown in figures 5 and 6, the first mould part 5a comprises a recess 10c, which recess 10c is cooperating with the second side wall 12 to form the gap G during the forming of the cellulose products 2. ln the embodiments shown in figures 8 and 10, the second side wall 12 of the second mould part 5b comprises a recess 12d, which recess is cooperating with the first mould part 5a to form the gap G during the forming of the cellulose products 2. The forming process in the embodiments shown in figures 5-10 is performed with the deformation element 7 in the same way and the different elements have the same functions as described in the other embodiment above. ln the embodiment shown in figure 11, the deformation element 7 is instead attached to the second mould part 5b. ln figures 5 and 14d a fourth embodiment of the forming mould 4 is shownjhgt does not form part ofthe invention. A gap G is formed between the first mould part 5a and the second mould part 5b during forming of the cellulose products 2. More specifically, the gap G is formed between the second side wall 12 and walls of the recess 10c in the first mould part 5a. ln this alternative embodiment, the recess 10c of the first mould part 5a has an L-shaped cross- sectional configuration. The gap G comprises a first gap section G1, where the first gap section G1 is formed in the pressing direction Dp along the overlapping width of the upper wall section 12c of the second side wall 12 between the upper wall section 12c and a lower surface 10cLs of the recess 10c. The gap G comprises a second gap section G2, where the second gap section G2 is formed in the overlapping section S0 with an extension in a directionperpendicular to the pressing direction Dp between the inner wall section 12b of the second side wall 12 and an outer wall 10c0vv of the recess 10c. ln figures 6 and 14e, a fifth embodiment of the forming mould 4 is shown. A gap G is formed between the first mould part 5a and the second mould part 5b during forming of the cellulose products 2. More specifically, the gap G is formed between the second side wall 12 and the walls of the recess 10c in the first mould part 5a. ln this alternative embodiment, the recess 10c of the first mould part 5a has a U-shaped cross-sectional configuration. The gap G comprises a first gap section G1, where the first section G1 is formed in a first overlapping section S01 with an extension in a direction perpendicular to the pressing direction Dp between the outer wall section 12a of the second side wall 12 and an inner wall 10civv of the recess 10c. The gap G comprises a second gap section G2, where the second gap section G2 is formed in the pressing direction Dp between the upper wall section 12c of the second side wall 12 and a lower surface 10cLs of the recess 10c. The gap G comprises a third gap section G3, where the third gap section G3 is formed in a second overlapping section S02 with an extension in a direction perpendicular to the pressing direction Dp between the inner wall section 12b of the second side wall 12 and an outer wall 10c0vv of the recess 10c. ln the embodiments shown in figures 5 and 6, the gap G with the different gap sections may have a width in a direction perpendicular to the pressing direction Dp with a sma||est dimension in a range of 0.005-5 mm, and a width in the pressing direction Dp with a sma||est dimension in the range 0.005-5 mm. ln the embodiments shown in figures 5 and 6, the forming mould system 1 further comprises the cellulose blank 3, and during forming of the cellulose products 2 the seal 8 is formed by the cellulose blank 3, where the cellulose blank 3 is arranged in the forming cavity 6 between the first mould part 5a and the second mould part 5b.

The forming mould 4 may further be arranged with a cutting device, wherein the cellulose blank 3 is cut into a desired shape in the forming mould 4 during the forming process. The gap G between the first mould part 5a and the second mould part 5b may be designed with a dimension where parts of the first mould part 5a and the second mould part 5b cooperate to establish a cutting function. Tests have shown that smaller gaps are providing a more precise cutting function. The forming mould may be designed so that the first mould part 5a comprises a first cutting edge 13 and the second mould part 5b comprises a second cutting edge 14, wherein the first cutting edge 13 and the second cutting edge 14 when meeting each other during the movement of the mould parts relative to each other are cooperating to cut the cellulose blank ln the embodiment shown in figures 2a-d the outer wall section 11a of the first side wall 11 and the inner wall section 12b of the second side wall 12 are arranged to cooperate with each other to cut the cellulose blank 3. The outer wall section 11a comprises a first cutting edge 13 and the inner wall section 12b comprises a second cutting edge 14, wherein the first cutting edge 13 and the second cutting edge 14 are cooperating to cut the cellulose blank 3. As shown in the figures, the first cutting edge 13 is arranged in a lower end of the outer wall section 11a, where the outer wall section 11a meets the lower surface 10b of the first mould part 5a. The first cutting edge 13 may be formed by an angled sharp transition between the outer wall section 11a and the lower surface 10b. The second cutting edge 14 is arranged in an upper end of the inner wall section 12b, where the inner wall section 12b meets the upper wall section 12c of the second side wall 12. The second cutting edge 14 may be formed by an angled sharp transition between the inner wall section 12b and the upper wall section 12c. The cutting edges may have any suitable shape or configuration to efficiently cut the cellulose blank. ln the embodiment shown in figures 4a-b the inner wall section 11b of the first side wall 11 and the outer wall section 12a of the second side wall 12 are arranged to cooperate with each other to cut the cellulose blank 3. The innerwall section 11b comprises a first cutting edge 13 and the outer wall section 12a comprises a second cutting edge 14, wherein the first cutting edge 13 and the second cutting edge 14 are cooperating to cut the cellulose blank 3. As shown in the figures, the first cutting edge 13 is arranged in a lower end of the inner wall section 11b, where the inner wall section 11b meets the lower wall section 11c of the first side wall 11. The first cutting edge 13 may be formed by an angled sharp transition between the inner wall section 11b and the lower wall section 11c. The second cutting edge 14 is arranged in an upper end of the outer wall section 12a, where the outer wall section 12a meets the upper wall section 12c of the second side wall 12. The second cutting edge 14 may be formed by an angled sharp transition between the outer wall section 12a and the upper wall section 12c. The cutting edges may have any suitable shape or configuration to efficiently cut the cellulose blank.

The embodiments shown in figures 3, 5 and 6 may also be provided with first and second cutting edges in a similar way as described above in relation to the embodiments shown in figures 2a-d and 4a-b. ln figures 7 and 14f a sixth embodiment of the forming mould 4 is shownihgj does :tot form part of tite inventšon. ln this embodiment, the forming mould 4 has a configuration similar to the forming mould shown in figures 2a-f but illustrated with a smaller or narrower gap G between the first side wall 11a of the first mould part 5a and the inner wall section 12b of the second side wall 12. ln the same way as described in embodiments above, the gap G has a width in a direction perpendicular to the pressing direction Dp with a smallest dimension in a range of 0.005-5 mm. A gap with small dimensions is for example desirable when using a cutting device in order to achieve an efficient cutting of the cellulose blank 3. ln this embodiment the forming mould 4 is provided with a cutting device in a similar way as described in connection to figures 2a-f above, where the outer wall section 11a comprises the first cutting edge 13 and the inner wall section 12b comprises a second cutting edge The first cutting edge 13 is arranged in a lower end of the outer wall section11a, and the second cutting edge 14 is arranged in an upper end of the inner wall section 12b. As illustrated in figures 7 and 14f, the cellulose blank 3 has been cut and after the cutting process the cellulose blank 3 has been pushed into the forming mould 4 by the deformation element 7. Since the gap G has a small dimension, the cellulose blank 3 is when being pushed into the forming mould 4 arranged below the first mould part 5a and therefore the gap G is sealed from below by the cellulose blank 3. Thus, the upper edge of the cellulose blank 3 that has been cut is in this embodiment arranged below the lower surface 10b of the first mould part 5a and the upper edge is sealing the gap G from below when being pushed towards the second mould part 5b by the deformation element ln figures 8 and 14g a seventh embodiment of the forming mould 4 is shown. ln this embodiment, the second side wall 12 comprises a recess 12d arranged at an upper part of the second side wall 12 in connection to the outer wall section 12a. A gap G is formed between the first mould part 5a and the second mould part 5b during forming of the cellulose products 2. ln the same way as described in embodiments above, the gap G has a width in a direction perpendicular to the pressing direction Dp with a smallest dimension in a range of 0.005-5 mm. More specifically, the gap G is formed between the inner wall section 11b of the first side wall 11 and an outer wall section 12dow of the recess 12d. ln this alternative embodiment, the recess 12d of the second mould part 5b has an L-shaped cross-sectional configuration. As further illustrated in figures 8 and 14g, the deformation element 7 has a step-like cross-sectional configuration with an outer part of the deformation element 7 arranged above the upper wall section 12c of the second side wall 12. ln this way, a part of the deformation element 7 is arranged between the lower surface 10b of the first mould part 5a and the upper wall section 12c of the second side wall 12. The forming mould 4 is provided with a cutting device, where the inner wall section 11b comprises the first cutting edge 13 and the outer wall section 12dow of the recess 12d comprises the second cutting edge 14. The first cutting edge 13 is arranged in a lower end of the inner wall section 11b, andthe second cutting edge 14 is arranged in an upper end of the outer wall section 12d0w of the recess 12d. Also in this embodiment the gap G has a small dimension, and the gap G is sealed from above by the cellulose blank ln figures 9 and 14h an eight embodiment of the forming mould 4 is shownjïaﬁ does not form part of the inventioaw. ln this embodiment, the forming mould 4 has a configuration similar to the forming mould shown in figure 7 with a small or narrow gap between the first side wall 11a of the first mould part 5a and the inner wall section 12b of the second side wall 12. ln the same way as described in embodiments above, the gap G has a width in a direction perpendicular to the pressing direction Dp with a smallest dimension in a range of 0.005-5 mm. ln this embodiment however, the forming mould 4 is not provided with a cutting device. lnstead of cutting the cellulose blank 3 in the forming process, the cellulose blank has been pre-formed into a desired shape before being arranged in the forming mould 4. The pre-formed cellulose blank 3 is when arranged in the forming mould 4 pushed into the forming mould 4 by the deformation element 7. Since the gap G has a small dimension, the pre-formed cellulose blank 3 is when being pushed into the forming mould 4 arranged below the first mould part 5a and therefore the gap G is sealed from below by the cellulose blank 3. Thus, the upper edge of the pre-formed cellulose blank 3 is in this embodiment arranged below the lower surface 10b of the first mould part 5a and the upper edge is sealing the gap G from below when being pushed towards the second mould part 5b by the deformation element 7. As shown in the figures, the inner wall section 12b of the second side wall 12 has an upper rounded edge to simplify the insertion of the cellulose blank 3 into the forming mould 4 when being pushed by the deformation element ln figures 10 and 14i a ninth embodiment of the forming mould 4 is shownjhgt does not form part of the inventiort. ln this embodiment, the second side wall 12 comprises a recess 12d arranged at an upper part of the second side wall 12 in connection to the inner wall section 12b. A gap G is formed between the first mould part 5a and the second mould part 5b during forming of the celluloseproducts 2. ln the same way as described in embodiments above, the gap G has a width in a direction perpendicular to the pressing direction Dp with a smallest dimension in a range of 0.005-5 mm. More specifically, the gap G is formed between the outer wall section 11a and an inner wall section 12diw of the recess 12d. ln this alternative embodiment, the recess 12d of the second mould part 5b has an L-shaped cross-sectional configuration with an upper wall section 12duvv and the inner wall section 12divv. As further i||ustrated in figures 10 and 14i, the deformation element 7 has a step-like cross-sectional configuration with an outer part of the deformation element 7 arranged above the upper wall section 12duvv of the recess 12d. ln this way, a part of the deformation element 7 is arranged between the lower surface 10b of the first mould part 5a and the upper wall section 12duw of the recess 12d. ln this embodiment the forming mould 4 is provided with a cutting device, where the outer wall section 11a comprises the first cutting edge 13 and the inner wall section 12d|w of the recess 12d comprises the second cutting edge 14. The first cutting edge 13 is arranged at a lower end of the outer wall section 11a, and the second cutting edge 14 is arranged at an upper end of the inner wall section 12d|w of the recess 12d. ln this embodiment the gap G is sealed from below by the deformation element ln figures 11 and 14j a tenth embodiment of the forming mould 4 is shown that does not form part of the šrtvention. ln this embodiment, the deformation element 7 is instead attached to the second mould part 5b. As shown in figure 11, the deformation element 7 is attached to the inner wall section 16b of the bottom wall 16 and the inner wall section 12b of the second side wall 12. The deformation element 7 may be attached to the second mould part 5b with suitable attachment means, such as for example glue or mechanical fastening members. The first mould part 5a has in this embodiment a step-like cross- sectional configuration corresponding to the shape of the cellulose products 2. A gap G is formed between the first mould part 5a and the second mould part 5b during forming of the cellulose products 2. ln the same way as described in embodiments above, the gap G has a width in a direction perpendicular to the pressing direction DF with a smallest dimension in a range of 0.005-5 mm. More specifically, the gap G is formed between the outer wall section 11a and the inner wall section 12b. As further illustrated in figures 11 and 14j, the deformation element 7 has a U-shaped cross-sectional configuration. However, the deformation element 7 may have any suitable shape depending on the type of cellulose products. ln this embodiment the forming mould 4 is provided with a cutting device, where the outer wall section 11a comprises the first cutting edge 13 and the inner wall section 12b of the recess 12d comprises the second cutting edge 14. The first cutting edge 13 is arranged at a lower end of the outer wall section 11a, and the second cutting edge 14 is arranged at an upper end of the inner wall section 12b. Also in this embodiment the gap G is sealed from below by the cellulose blank As described above, the deformation element 7 is being deformed during the forming process, and the deformation element 7 is during forming of the cellulose products 2 arranged to exert a forming pressure PF on the cellulose blank 3. To exert a required forming pressure PF on the cellulose blank 3, the deformation element 7 is made of a material that can be deformed when a force or pressure is applied. For example, the deformation element 7 can be made of an elastic material capable of recovering size and shape after deformation. The deformation element 7 may further be made of a material with suitable properties that is withstanding the high forming pressure and temperature levels used when forming the cellulose products 2 in the forming mould During the forming process, the deformation element 7 is deformed to exert the forming pressure PF on the cellulose blank 3 and through the deformation an even pressure distribution can be achieved in the forming mould 4, even if the cellulose products 2 are having complex three-dimensional shapes or if the cellulose blank 3 used is having varying density, thickness, or grammage levels.Certain elastic or deformable materials have fluid-like properties when being exposed to high pressure levels. lf the deformation element 7 is made of such a material, an even pressure distribution in the forming mould 4 can be achieved in the forming process, where the pressure exerted on the cellulose blank 3 from the deformation element 7 is equal or essentially equal in all directions in the forming mould 4. When the deformation element 7 during pressure is in its fluid-like state, a uniform fluid-like pressure distribution is achieved in the forming mould 4. The forming pressure is with such a material thus applied to the cellulose blank 3 from all directions, and the deformation element 7 is in this way during the forming of the cellulose products 2 exerting an isostatic forming pressure Piso on the cellulose blank 3, as illustrated with arrows in figure 15. The isostatic forming pressure Piso from the deformation element 7 is establishing a uniform pressure in all directions in the forming mould 4 on the cellulose blank 3. The isostatic forming pressure Piso is providing an efficient forming process of the cellulose products 2 in the forming mould 4, and the cellulose products 2 can be produced with high quality even if having complex shapes. As shown in figure 15, the second mould part 5b has a configuration with the inner side wall section 12b of the side wall 12 with a curved shape, and the deformation element 7 is exerting an isostatic forming pressure Piso as described above on the cellulose blank 3 arranged in the forming mould 4 between the deformation element 7 and the side wall section 12b and the inner wall section 16b of the bottom wall The deformation element 7 may be made of a suitable structure of elastomeric material, where the material has the ability to establish a uniform pressure on the cellulose blank 3 in the forming mould 4 during the forming process. As an example, the deformation element 7 is made of a massive structure or an essentially massive structure of silicone rubber, polyurethane, polychloroprene, or rubber with a hardness in the range 20-90 Shore A. Other materials for the deformation element 7 may for example be suitable gel materials, liquid crystal elastomers, and MR fluids.As described above, the deformation element 7 is through deformation during forming of the cellulose products 2 establishing a uniform pressure in all directions in the forming mould 4 on the cellulose blank 3, and the deformation element 7 is during forming of the cellulose products 2 exerting an isostatic forming pressure Piso on the cellulose blank 3. A suitable isostatic forming pressure Plso when forming the cellulose products 2 is within the range 1-100 MPa. ln the different embodiments described above, the deformation element 7 may be releasably attached to the first mould part 5a or the second mould part 5b. The deformation element 7 is shaped into a shape suitable for the forming mould 4, wherein the deformation element 7 during the forming of the cellulose product 2 is enabling an efficient pressure distribution on the cellulose blank The forming mould system 1 in the different embodiments described above is further comprising a heating device 17 arranged in relation to the first mould part 5a and/or the second mould part 5b. During forming of the cellulose products 2 the first mould part 5a and/or the second mould part 5b is heated to a forming mould temperature in the range 100-500 °C to establish the forming temperature TF in the range of 100°C to 300°C that needs to be applied to the cellulose blank 3. The heating device may be integrated in the first mould part 5a and/or the second mould part 5b, and suitable heating devices 17 are e.g. an electrical heater or a fluid heater in which a heated fluid medium is flowing in channels in the forming mould parts. Other suitable heat sources may also be used.

The forming mould system 1 in the different embodiments described above is further comprising a pressing unit 18 arranged to apply a pressure on the first mould part 5a and/or the second mould part 5b, wherein during forming of the cellulose products 2 the deformation element 7 is exerting a forming pressure PF on the cellulose blank 3 in the range 1-100 MPa. The pressing unit may also be used for displacing the first mould part 5a and /or the second mould part 5b. The moving mould part or alternatively moving mould parts may bedisplaced with a suitable pressing actuator, such as a hydraulic, pneumatic, or electric actuator.

As described above, the deformation element 7 may be made of a structure of elastomeric material, and as an example the deformation element 7 is made of a massive structure or an essentially massive structure of silicone rubber, polyurethane or rubber. ln an alternative embodiment shown in figure 12, the deformation element 7 instead comprises a flexible membrane 15a and a pressure media 15b. With this construction, the deformation element 7 during the forming of the cellulose product 2 is enabling an efficient pressure distribution on the cellulose blank ln the example embodiment shown in figure 12, the deformation element 7 is arranged in connection to the first mould part 5a and the pressure media 15b may for example be hydraulic oil exerting a pressure on the flexible membrane 15a during the forming of the cellulose products 2. An outer part of the flexible membrane 15a may for example be attached to the lower surface 10b of the first mould part 5a, wherein a sealed volume 15c is formed between the flexible membrane 15a and the lower surface 10b. The pressure media 15b may for example, as shown in figure 12, flow into and out from the sealed volume 15c through a channel 15d arranged in the first mould part 5a. Through the pressure media 15b the deformation element is exerting a forming pressure PF on the cellulose blank 3. During the forming process the pressure media 15b is allowed to flow into the sealed volume 15c, wherein the flexible membrane 15a is being deformed and is exerting a forming pressure PF on the cellulose blank 3 arranged in the forming cavity 6 of the forming mould 4. As described above, a suitable forming pressure PF when forming the cellulose products 2 is within the range 1-100 MPa. By applying a suitable pressure on the cellulose blank with the flexible membrane 15a, the cellulose fibres in the cellulose blank 3 are compressed in the forming mould 4. The applied pressure on the cellulose blank 3 from the pressure media 15b and the flexible membrane 15a may be isostatic in order to compress the cellulose fibres evenly regardless oftheir relative position on the forming mould 4 and regardless of the actual local amount of fibres. The isostatic pressure from the deformation element 7 is establishing a uniform pressure in all directions in the forming mould 4 on the cellulose blank 3. ln this way an efficient forming of the cellulose products 2 is achieved, and the cellulose products 2 can be produced with high quality. The pressure media 15b and/or the forming mould parts may be heated to establish a suitable forming temperature TF. ln the embodiment shown in figure 12, the forming mould system 1 may comprise a fluid control device (not shown in the figures) for the pressure media 15b, and the fluid control device may be an actuator or similar arrangement compressing and transporting the pressure media 15b into the sealed volume 15c, and also transporting the pressure media 15b out from the sealed volume 15c after the forming process. The pressure media used in the forming process may be any suitable fluid, such as for example hydraulic oil, water and air.

The forming mould 4 in the embodiment shown in figure 12 may in the same way as described in embodiments above be designed so that the first mould part 5a comprises a first cutting edge 13 and the second mould part 5b comprises a second cutting edge 14, wherein the first cutting edge 13 and the second cutting edge 14 when meeting each other during the movement of the mould parts relative to each other are cooperating to cut the cellulose blank As an alternative to use the cellulose blank 3 as the seal 8 described in the different embodiments above, the seal 8 may instead during forming of the cellulose products 2 be formed by the deformation element 7 arranged in the forming cavity 6 between the first mould part 5a and the second mould part 5b. This alternative seal 8 formed by the deformation element 7 is illustrated in figure 13a, where the forming mould 4 has a configuration similar to the embodiment described in relation to figure 2a-d. When the deformation element 7 is compressed during the forming of the cellulose products 2, the deformation element 7 is ﬂoating out and sealing the gap G, as shown in figure 13a. ln the embodiment shown in figure 13a, the upper part of the deformation element is sealing the gap G. The same function can be achieved in the other mould configurations described. ln a further alternative embodiment, the seal 8 may be formed by a separate sealing element 9, where during forming of the cellulose products 2 the sealing element 9 is arranged between the first mould part 5a and the second mould part 5b. This alternative sealing element 9 is illustrated in figure 13b, where the forming mould 4 has a configuration similar to the embodiment described in relation to figure 2a-d. The sealing element 9 is during the forming of the cellulose products 2 sealing the gap, as shown in figure 13b. The sealing element 9 may have any suitable configuration and be made of a suitable elastomeric material, such as for example silicone materials, rubber materials, polyurethane, or other elastic or elastomeric materials. The sealing element may have a shape corresponding to the peripheries of the outer wall section 11a of the first side wall 11 and the inner wall section 12b of the second side wall 12. The sealing element may further have a suitable cross-sectional shape, such as for example a flat, round, rectangular, oval, or other regular and irregular shapes. The sealing element 9 may be attached to the first mould part 5a or the second mould part 5b depending on the design of the forming mould. The mould parts may be provided with a groove or other suitable means for holding the sealing element 9 to the mould part. Further, as an alternative, two or more sealing elements 9 may be attached to the first mould part 5a and/or the second mould part 5b to establish the sealing function between the mould parts. lt should be understood that the gap G may have an extension in any suitable direction in relation to the pressing direction Dp. The gap may for example be curved or inclined depending on the construction of the forming mould 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 inthe 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, 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.Claims A forming mould system (1) for forming three-dimensional cellulose products (2) from an air-formed cellulose blank (3), comprising a forming mould (4) having a first mould part (5a), a second mould part (5b), a forming cavity (6), and a deformation element (7), wherein the deformation element (7) is attached to a lower surface (1 Ob) of the first mould part (5a), wherein the first mould part (5a) and the second mould part (5b) are movable in relation to each other in a pressing direction (Dp) and arranged to be pressed in relation towards each other during forming of the cellulose products (2), wherein the forming cavity (6) is formed and enclosed by the first mould part (5a) and the second mould part (5b) during forming of the cellulose products (2), and wherein the deformation element (7) during forming of the cellulose products (2) is arranged in the forming cavity (6) and is exerting a forming pressure (PF) on the cellulose blank (3), \\\\\\\ .\ wherein the first mould part (5a) comprises :ff t . an inner wall section (11b,10clW), and the second mould part (5b) comprises a second side wall (12) with an outer wall section (12a,12dow),(¿;§ f-“Å 'Üšﬂ "§~'~\.-$ -\ m ::-*\\\'\-:§~“' H-”ÜÉ ;“<:§«“\53=“\~^\ SW "§~^\\ ~ :_-:,\.~'_=, :xt crt: :“~:,-*.\.«\.-: won \\\.-\..-:.:\.~=: \ .~.<:.\.-\ wherein the inner wall section (11b,10clW) and the outer wall section (12a,12d0w) during forming of the cellulose products (2) are arranged to at least partly overlap each other establishing an overlapping section (So) in the pressing direction (DP), wherein the inner wall section (11b,10clW) and the outer wall section (12a,12dow) in the overlapping section (So) have corresponding peripheral shapes in any plane (P) perpendicular to the pressing direction (DP), wherein a gap (G) is formed between the first mould part (5a) and the second mould part (5b) during forming of the cellulose products (2), wherein the gap (G) has an extension in a direction perpendicular to the pressing direction (Dp) between the inner wall section (11b,10ciw) and the outer wall section (12a,12d0vv) in the overlapping section (So), wherein the system (1) further comprises a sea| (8), wherein the sea| (8) is sealing the gap (G) between the first mould part (5a) and the second mould part (5b) during forming of the cellulose products (2), wherein during forming of the cellulose products (2) the sea| (8) is formed by the deformation element (7) arranged in the forming cavity (6) between the first mould part (5a) and the second mould part .»-\.\ <-« =-.~\ ~ ._ * : wherein the deformation element (7) during forming of the cellulose products (2) is arranged to exert an isostatic forming pressure (Piso) on the cellulose blank (3), wherein during forming of the cellulose products (2) the deformation element (7) through deformation is arranged to establish a uniform pressure in all directions in the forming mould (4) on the cellulose blank (3), wherein the deformation element during forming of the cellulose products (2) is exerting an isostatic forming pressure (Piso) on the cellulose blank (3) in the range 1-100 MPa. system (1) according to any of the preceding claims _A system (1) according to any of claims 1 or wherein the first mould part (5a) comprises a first cutting edge (13) and the second mould part (5b) comprises a second cutting edge (14), wherein the first cutting edge (13) and the second cutting edge (14) are arranged to cooperate to cut the cellulose blank (3). system (1) according to any of the preceding claims, wherein the first mould part (5a) comprises an outer wall section (11a,10covv)¿g. second side wall (12) with an inner wall section (12b,12d|vv), and the second mould part (5b) comprisesjﬁg \ wherein the outer wall section (11a,10covv) and the inner wall section (12b,12divv) during forming of the cellulose products (2) are arranged to at least partly over|ap each other establishing an over|apping section (So) in the pressing direction (Dp), wherein the outer wall section (11a,10covv) and the inner wall section (12b,12divv) in the over|apping section (So) have corresponding periphera| shapes in any p|ane (P) perpendicu|ar to the pressing direction (Dp). ~ *LA system (1) according to claim wherein the gap (G) has an extension in a direction perpendicu|ar to the pressing direction (Dp) between the outer wall section (11a,10cow) and the inner wall section (12b,12divv) in the over|apping section (So). wherein the gap (G) has a width in a direction perpendicu|ar to the pressing direction (Dp) with a sma||est dimension in the range 0.005-5 mm. (A system (1) according to claims :ïrr-:rí :xfvi :xfñy ~':ï::âr~;:;: wherein the outer wall section (1 1a,10c0w) of the first mould part (5a) comprises the first cutting edge (13) and the inner wall section (12b,12divv) of the second side wall (12) comprises the second cutting edge (14), or wherein the inner wall section (11b,10civv) of the first mould part (5a) comprises the first cutting edge (13) and the outer wall section (12a,12d0vv) of the second side wall (12) comprises the second cutting edge (14), wherein the first cutting edge (13) and the second cutting edge (14) are arranged to cooperate to cut the cellulose blank (3). system (1) according to any of the preceding claims, wherein the first mould part (5a) comprises a lower surface (10b,10cLs) and the second side wall (12) comprises an upper wall section (12c), and wherein the gap (G) has an extension in the pressing direction (DP) between the lower surface (10b,10cLs) and the upper wall section (12c). A system (1) according to claim wherein the gap (G) has a width in the pressing direction (DP) with a smallest dimension in the range 0.005-5 mm. A system (1) according to any of the preceding claims, wherein the deformation element (7) is releasably attached to the < \ first mould part (5a) ïïï-:z ;:^1:::::f*ï:>í nr; gr-:ïz-i A system (1) according to any of the preceding claims, wherein the deformation element (7) is made of a structure of elastomeric material, or a flexible membrane (15a) and a pressing fluid (15b). A system (1) according to claim wherein the deformation element (7) is made of a massive structure of silicone rubber or rubber with a hardness in the range 20-90 Shore A. (A system (1) according to any of the preceding claims, wherein the system (1) further comprises a heating device (17) arranged in relation to the first mould part (5a) and/or the second mould part (5b), wherein during forming of the cellulose products (2) the first mould part (5a) and/or the second mould part (5b) is heated to a forming mould temperature in the range 100°C to 500°C. A system (1) according to any of the preceding claims, wherein the system (1) further comprises a pressing unit (18) arranged to apply a pressure on the first mould part (5a) and/or the second mould part (5b), wherein during forming of the cellulose products (2) the deformation element (7) is exerting a forming pressure (PF) on the cellulose blank (3) in the range 1-100 MPa. A method for forming three-dimensional cellulose products (2) from an air-formed cellulose blank (3) in a forming mould system (1) wherein the system (1) comprises a forming mould (4) having a first mould part (5a), a second mould part (5b), a forming cavity (6), and a deformation element (7)_“ wherein the method comprises the steps: moving the first mould part (5a) and the second mould part (5b) in relation to each other in a pressing direction (DP), pressing the first mould part (5a) and the second mould part (5b) in relation towards each other during forming of the cellulose products (2), wherein the forming cavity (6) is formed and enclosed by the first mould part (5a) and the second mould part (5b) during forming of the cellulose products (2), exerting ag; forming pressure (PF) än on the cellulose blank (3) by the deformation element (7) during forming of the cellulose products (2), wherein the deformation element (7) during forming of the cellulose products (2) is arranged in the forming cavity (6), wherein a gap (G) is formed between the first mould part (5a) and the second mould part (5b) during forming of the cellulose products (2), and wherein the system (1) further comprises a seal (8), wherein the seal (8) is sealing the gap (G) between the first mould part (5a) and the second mould part (5b) during forming of the cellulose products (2):