Dry-formed cellulose product, method for dry-forming a cellulose product and forming mould for dry-forming a cellulose product

Abstract

A dry-formed cellulose product comprising interconnected cellulose fibres. The cellulose product is arranged as a three-dimensional compressed fibre structure with an inner side and an outer side, where the inner side is delimiting an inner volume configured for holding one or more articles. The outer side comprises at least one structured zone, where the at least one structured zone is formed by a base surface and a plurality of grip elements.

Description

[0001] DRY-FORMED CELLULOSE PRODUCT, METHOD FOR DRY-FORMING A CELLULOSE PRODUCT AND FORMING MOULD FOR DRY-FORMING A CELLULOSE PRODUCT

[0002] TECHNICAL FIELD

[0003] The present disclosure relates to a dry-formed cellulose product comprising interconnected cellulose fibres. The cellulose product is arranged as a three- dimensional compressed fibre structure with an inner side and an outer side, where the inner side is delimiting an inner volume. The disclosure further relates to a method for dry-forming a cellulose product from cellulose fibres in a forming mould, and a forming mould for dry-forming a cellulose product from cellulose fibres.

[0004] BACKGROUND

[0005] Cellulose fibres are commonly used as raw material for producing or manufacturing cellulose products. Products formed of cellulose fibres can be used in many different situations where there is a need for sustainable products. A wide range of cellulose products can be produced from cellulose fibres, such as packagings for holding or storing articles, coffee pods, or containers for holding or storing articles.

[0006] Forming mould systems are commonly used when manufacturing cellulose products from raw materials including cellulose fibres, and traditionally the cellulose products have been produced by wet-forming methods. With the wet-forming methods, there is a need for drying of the wet moulded product, where the drying process is a time and energy consuming part of the production. One development in the field of producing cellulose products is dry-forming of cellulose products without using wetforming methods. Instead of forming the cellulose products from a liquid or semi liquid pulp suspension or slurry, an air-formed cellulose blank structure is used. The airformed cellulose blank structure is inserted into a forming mould, and during the dryforming of the cellulose products the cellulose blank is subjected to a high forming pressure and a high forming temperature. One issue with cellulose products is that they may be difficult to handle or grip by a user, especially when the products are small, or when the products are exerted to fluids making them slippery. There is thus a need for improving the handling ability of cellulose products.

[0007] SUMMARY

[0008] An object of the present disclosure is to provide a dry-formed cellulose product, a method for dry-forming a cellulose product, and a forming mould for dry-forming a cellulose product, 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 dry-formed cellulose product, the method for dry-forming a cellulose product, and the forming mould for dry-forming a cellulose product.

[0009] The disclosure concerns a dry-formed cellulose product comprising interconnected cellulose fibres. The cellulose product is arranged as a three-dimensional compressed fibre structure with an inner side and an outer side, where the inner side is delimiting an inner volume configured for holding one or more articles. The outer side comprises at least one structured zone, where the at least one structured zone is formed by a base surface and a plurality of grip elements.

[0010] Advantages with these features are that the structure zone is increasing the friction when gripping the cellulose product. The structured zone will improve the handling ability of the cellulose product, making it easier to handle or grip by a user. This may especially be beneficial when the product is small, or when the product is exerted to fluids making it slippery. Experiments have shown that, the structured zone has the further advantage that fibres from the cellulose product do not tend to loosen from a structured surface, i.e. loosen from the tip or top of the grip elements in the structured zone, as compared to a non-structured surface.

[0011] In one embodiment, the grip elements are arranged as protruding elements extending from the base surface. The protruding elements are increasing the friction when the cellulose product is gripped by a user. In one embodiment, the base surface is integrated in the compressed fibre structure of the cellulose product and arranged as compressed indentations between the grip elements. The compressed indentations are in this way efficiently forming the integrated base surface during the dry-forming operation in the forming mould. The integration of the base surface is providing a product design where the structured zone is fully integrated in the cellulose product.

[0012] In one embodiment, the compressed indentations have a higher density than the protruding elements. The higher density is enabling a durable design of the structured zone.

[0013] In one embodiment, the grip elements are integrated in the compressed fibre structure of the cellulose product. The integration of the grip elements is providing a product design where the structured zone is fully integrated in the cellulose product.

[0014] In one embodiment, the grip elements are arranged as tapered elements, each comprising a base structure, a top structure, and a side structure extending between the base structure and the top structure. The grip elements have a tapering configuration from the base structure towards the top structure. The tapered elements are efficiently increasing the friction, improving the handling ability of the cellulose product and making it easier to handle or grip by a user.

[0015] In one embodiment, the top structure is arranged as a flat surface, or an essentially flat surface. The flat surface is enabling efficient gripping of the cellulose product.

[0016] In one embodiment, the grip elements are configured as truncated pyramid structures. This configuration of the grip elements is efficiently increasing the friction when the cellulose product is gripped by a user.

[0017] In one embodiment, the base structure and the top structure are arranged with triangular shapes, and / or the base structure and the top structure are arranged with quadrangular shapes, and / or the base structure and the top structure are arranged with pentagonal shapes, and / or the base structure and the top structure are arranged with hexagonal shapes. These alternative configurations of the grip elements are efficiently increasing the friction when the cellulose product is gripped by a user. In one embodiment, the grip elements are configured as truncated cone structures. This configuration of the grip elements is efficiently increasing the friction when the cellulose product is gripped by a user.

[0018] In one embodiment, the base structure and the top structure are arranged with circular shapes, and / or the base structure and the top structure are arranged with oval shapes. These alternative configurations of the grip elements are efficiently increasing the friction when the cellulose product is gripped by a user.

[0019] In one embodiment, the top structure is arranged as a curved surface. This configuration of the grip elements is efficiently increasing the friction when the cellulose product is gripped by a user.

[0020] In one embodiment, the structured zone has an orange peel like structural configuration formed by the grip elements. This configuration of the grip elements is efficiently increasing the friction when the cellulose product is gripped by a user.

[0021] In one embodiment, the grip elements are configured as elongated ridge structures. This configuration of the grip elements is efficiently increasing the friction when the cellulose product is gripped by a user.

[0022] In one embodiment, the base surface is arranged in a fist plane. The top structures of the grip elements are forming a second plane arranged at a distance from the first plane. By arranging the base surface and the grip element in different planes, an efficient structure of the structured zone is achieved.

[0023] In one embodiment, the distance between the first plane and the second plane is in the range of 0,08-0,2 mm. The grip elements can have any suitable shape or form, as mentioned in the description. The distance between the grip elements may vary dependent on form and shape of the grip elements, but is in the millimetre range. For example, the distance between the grip elements at the base structure plane, i.e. the first plane, of the gripping element may for example be in the range 0.1-4 mm. Dependent on shape and form, the distance between the grip elements at the top structure plane, i.e. the second plane, is advantageously larger than at the first plane since the side structures advantageously slants inwardly starting from the base structure towards the top structure, as mentioned in the description. The amount of grip elements per surface area can vary dependent on design of the pattern. As shown in the figures, the pattern can be in the form of diagonal grooves and ridges. In such a design a suitable pitch between the ridges are in the range 1-5 mm, preferably between 2-3 mm. In a pattern with diagonal groves and ridges running across each other, i.e. forming a web-like pattern on a surface extending in an X-Y- plane, the pitch can vary or be the same in X-direction and the Y-direction. In one example which has proven promising, the pitch in the X-direction is 3.8 mm and in the Y-direction 1 ,4mm in a grip element area, i.e. the structured zone, with around 20 grip elements per square centimetre. However, the above example numbers are a design choice and the pattern can typically have a pitch in the X-direction in the range 1-5 mm and a pitch in the Y-direction in the range 1-5 mm with 15-25 grip elements per square centimetre for a pattern similar to the web-like pattern.

[0024] In one embodiment, the grip elements have a height between the base structure and the top structure in the range of 0,08-0,2 mm. The base structure has a thickness that varies with the height of the grip elements. The thickness of the base structure is typically 50-90% of the total height, i.e. thickness, of the base structure and the height of the grip element in order not to jeopardize the overall strength of the product in the grip element area.

[0025] The disclosure further concerns a method for dry-forming a cellulose product from cellulose fibres in a forming mould. The method comprises the steps: providing the cellulose fibres and arranging the cellulose fibres in the forming mould; dry-forming the cellulose product in the forming mould by applying a forming pressure and a forming temperature onto the cellulose fibres for interconnecting the cellulose fibres into a three-dimensional compressed fibre structure. Upon dry-forming, the cellulose product is formed with an inner side and an outer side, where the inner side is delimiting an inner volume. The outer side is formed with at least one structured zone, where the at least one structured zone comprises a base surface and a plurality of grip elements.

[0026] Advantages with these features are that the dry-formed cellulose product can be provided with the at least one structure zone during the dry-forming operation, where the structured zone is increasing the friction when gripping the cellulose product. The structured zone will improve the handling ability of the cellulose product, making it easier to handle or grip by a user. This may especially be beneficial when the product is small, or when the product is exerted to fluids making it slippery.

[0027] In one embodiment, the method further comprises the steps: dry-forming the cellulose product into the three-dimensional compressed fibre structure by pressing and heating the cellulose fibres in the forming mould with a forming pressure in the range of 1-600 MPa, preferably in the range of 1-100 MPa, more preferably in the range of 4-20 MPa, and with a forming temperature in the range of 60-300 °C, preferably in the range of 100-200 °C, more preferably in the range of 120-170 °C. These parameters are enabling an efficient dry-forming process, and is enabling the forming of the at least one structured zone with high quality.

[0028] In one embodiment, the method further comprises the steps: forming the cellulose product into the three-dimensional compressed fibre structure in a single pressing operation by pressing and heating the cellulose fibres in the forming mould with the forming pressure and the forming temperature. The single pressing operation is enabling a fast and efficient dry-forming process, where the forming pressure and the forming temperature are applied onto the cellulose fibres during a single pressing operation upon forming of the cellulose product in the forming mould. With a single pressing operation is meant that the cellulose product is dry-formed from the cellulose fibres in one single pressing step in the forming mould. In the single pressing operation, the first mould part and the second mould part are interacting with each other for establishing the forming pressure and the forming temperature during a single operational engagement step. Thus, in the single pressing operation, the forming pressure and the forming temperature are not applied to the cellulose fibres in two or more repeated pressing steps.

[0029] In one embodiment, the cellulose fibres have a moisture content in the range of 4-20 wt%, preferably in the range of 6-15 wt%, when arranged in the forming mould. This moisture content is suitable for a fast and efficient dry-forming operation in the forming mould.

[0030] In one embodiment, the forming mould comprises at least one structured section, wherein the method further comprises the step: forming the at least one structured zone by means of at least one corresponding structured section. The structured section of the forming mould is enabling the forming of the structured zone. The structured section is suitably arranged as a patterned or structured part of the forming mould, and the structured or patterned part is corresponding to the configuration of the structured zone that is formed in the cellulose product during the dry-forming process in the forming mould.

[0031] In one embodiment, the method further comprises the step: forming the grip elements as protruding elements extending from the base surface by means of the structured section, where the structured section comprises shaping elements corresponding to the protruding elements and the base surface. In this embodiment, the structured section is arranged as a patterned or structured part of the forming mould, where the shaping elements have a structural shape that is forming the protruding elements. The protruding elements are increasing the friction when the cellulose product is gripped by a user.

[0032] In one embodiment, the method further comprises the steps: integrating the base surface into the compressed fibre structure of the cellulose product by compressing indentations between the grip elements upon dry-forming the cellulose product in the forming mould, wherein the compressed indentations have a higher density than the grip elements. The integration of the base surface is providing a product design where the structured zone is fully integrated in the cellulose product. The compressed indentations with higher density are efficiently forming the integrated base surface during the dry-forming operation in the forming mould, where the base surface can be formed with a high rigidity.

[0033] In one embodiment, the method further comprises the step: forming the grip elements as tapered elements, each comprising a base structure, a top structure, and a side structure extending between the base structure and the top structure, where the grip elements have a tapering configuration from the base structure towards the top structure. The tapered elements are efficiently increasing the friction, improving the handling ability of the cellulose product and making it easier to handle or grip by a user.

[0034] The disclosure further concerns a forming mould for dry-forming a cellulose product from cellulose fibres. The cellulose product is arranged as a three-dimensional compressed fibre structure with an inner side and an outer side. The forming mould comprises a first mould part and a second mould part configured for interacting with each other upon dry-forming of the cellulose product by applying a forming pressure and a forming temperature onto the cellulose fibres for interconnecting the cellulose fibres into the three-dimensional compressed fibre structure. The first mould part and / or the second mould part comprises at least one structured section configured for forming at least one structured zone having a base surface and a plurality of grip elements on the outer side of the cellulose product. The structured section of the forming mould is enabling the forming of the structured zone. The structured section is suitably arranged as a patterned or structured part of the forming mould, and the structured or patterned part is corresponding to the configuration of the structured zone that is formed in the cellulose product during the dry-forming process in the forming mould.

[0035] In one embodiment, the at least one structured section is configured for forming the grip elements as protruding elements extending from the base surface. The structured section comprises shaping elements corresponding to the protruding elements and the base surface. In this embodiment, the structured section is arranged as a patterned or structured part of the forming mould, where the shaping elements have a structural shape that is forming the protruding elements. The protruding elements are increasing the friction when the cellulose product is gripped by a user.

[0036] In one embodiment, the at least one structured section is configured for forming the grip elements as tapered elements, each comprising a base structure, a top structure, and a side structure extending between the base structure and the top structure. The grip elements have a tapering configuration from the base structure towards the top structure. The tapered elements are efficiently increasing the friction, improving the handling ability of the cellulose product and making it easier to handle or grip by a user.

[0037] BRIEF DESCRIPTION OF DRAWINGS

[0038] The disclosure will be described in detail in the following, with reference to the attached drawings, in which

[0039] Fig. 1a-d show schematically, in perspective views, in a view from above, and in a cross-sectional side view, a cellulose product arranged with a structured zone formed by a base surface and a plurality of grip elements,

[0040] Fig. 2a-c show schematically, in a view from above, in a cross-sectional side view, and in a perspective view, the structured zone formed by the base surface and the plurality of grip elements,

[0041] Fig. 3a-c show schematically, in perspective views, embodiments of cellulose products arranged with structured zones having alternative configurations,

[0042] Fig. 4a-b show schematically, in perspective views, embodiments of cellulose products arranged with structured zones having alternative configurations,

[0043] Fig. 5a-b show schematically, in a perspective view and in a partly cross-sectional side view, an embodiment of a cellulose product arranged with a structured zone having an alternative configuration,

[0044] Fig. 6a-b show schematically, in a perspective view and in a partly cross-sectional side view, an embodiment of a cellulose product arranged with a structured zone having an alternative configuration,

[0045] Fig. 7a-b show schematically, in a perspective view and in a partly cross-sectional side view, an embodiment of a cellulose product arranged with a structured zone having an alternative configuration,

[0046] Fig. 8a-d show schematically, in side views, a forming mould for dry-forming the cellulose product arranged with the structured zone formed by a base surface and a plurality of grip elements, and

[0047] Fig. 9a-b show schematically, in a perspective view, mould parts of the forming mould with a mould part comprising a structured section for forming the structured zone, and in a view from above, the mould part comprising the structured section for forming the structured zone.

[0048] DESCRIPTION OF EXAMPLE EMBODIMENTS

[0049] 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. Figures 1a-d show an embodiment of a dry-formed cellulose product 1 comprising interconnected cellulose fibres CF. The cellulose product 1 is arranged as a three- dimensional compressed fibre structure CSD with an inner side 1a and an outer side 1 b, where the inner side 1a is delimiting an inner volume 1c. The inner volume 1c is arranged for holding one or more articles A, as indicated with dotted lines in figures 1a and 1d. The article A may be of any suitable type and the cellulose product may be used for holding or storing the article A. The outer side 1b comprises a structured zone 3 formed by a base surface SB and a plurality of grip elements 4.

[0050] As shown in figures 1a-d and 2a-c, the grip elements 4 of the structured zone 3 are arranged as protruding elements P extending from the base surface SB. The base surface SB is integrated in the compressed fibre structure CSD of the cellulose product 1 , and the base surface SB may be arranged as compressed indentations I between the grip elements 4. Suitably, the compressed indentations I have a higher density than the protruding elements P. The grip elements 4 are in the shown embodiment integrated in the compressed fibre structure CSD of the cellulose product 1 . Through the arrangement of the base surface SB and the grip elements 4 integrated in the compressed fibre structure CSD of the cellulose product 1 , a fully integrated compressed fibre structure CSD is achieved.

[0051] The grip elements 4 are as understood from figures 1a-d and 2a-c arranged as tapered elements, each comprising a base structure 4a and a top structure 4b. A side structure 4c is extending between the base structure 4a and the top structure 4b, and in this way, the grip elements 4 have a tapering configuration from the base structure 4a towards the top structure 4b.

[0052] The grip elements 4 may have different configurations and shapes depending on the design of the cellulose product 1. Suitably, the top structure 4b is arranged as a flat surface, or an essentially flat surface, providing efficient gripping properties.

[0053] In embodiments, the cellulose products 1 are arranged with a structured zone 3 formed by a base surface SB and a plurality of grip elements 4 configured as truncated pyramid structures SPT, as illustrated in figures 2a-c and 3a-c. The grip elements 4 are arranged as tapered elements, each comprising a base structure 4a, a top structure 4b, and a side structure 4c extending between the base structure 4a and the top structure 4b. The grip elements 4 have a tapering configuration from the base structure 4a towards the top structure 4b, and the top structure 4b is arranged as a flat surface, or an essentially flat surface.

[0054] In the embodiment shown in figures 1a-d and 2a-c, the base structure 4a and the top structure 4b are arranged with quadrangular shapes. The top structure 4b is arranged as a flat surface, or an essentially flat surface. The side structure 4c is arranged with four side surfaces, extending from the base structure 4a to the top structure 4b. The base surface SB is in this embodiment arranged as a grid-like surface extending around the base structures 4a of the plurality of grip elements 4.

[0055] In the embodiment shown in figure 3a, the base structure 4a and the top structure 4b are arranged with triangular shapes with the top structure 4b configured as a flat surface, or an essentially flat surface. The side structure 4c is arranged with three side surfaces, extending from the base structure 4a to the top structure 4b. The base surface SB is in this embodiment arranged as a surface extending around the base structures 4a of the plurality of grip elements 4.

[0056] In the embodiment shown in figure 3b, the base structure 4a and the top structure 4b are arranged with pentagonal shapes with the top structure 4b configured as a flat surface, or an essentially flat surface. The side structure 4c is arranged with five side surfaces, extending from the base structure 4a to the top structure 4b. The base surface SB is in this embodiment arranged as a surface extending around the base structures 4a of the plurality of grip elements 4.

[0057] In the embodiment shown in figure 3c, the base structure 4a and the top structure 4b are arranged with hexagonal shapes with the top structure 4b configured as a flat surface, or an essentially flat surface. The side structure 4c is arranged with six side surfaces, extending from the base structure 4a to the top structure 4b. The base surface SB is in this embodiment arranged as a surface extending around the base structures 4a of the plurality of grip elements 4.

[0058] In embodiments, the cellulose products 1 are arranged with a structured zone 3 formed by a base surface SB and a plurality of grip elements 4 configured as truncated cone structures SCT, as illustrated in figures 4a-b. The grip elements 4 are arranged as tapered elements, each comprising a base structure 4a, a top structure 4b, and a side structure 4c extending between the base structure 4a and the top structure 4b. The grip elements 4 have a tapering configuration from the base structure 4a towards the top structure 4b, and the top structure 4b is arranged as a flat surface, or an essentially flat surface.

[0059] In the embodiment shown in figure 4a, the base structure 4a and the top structure 4b are arranged with circular shapes, with the top structure 4b configured as a flat surface, or an essentially flat surface. The side structure 4c is arranged as a curved surface, extending from the base structure 4a to the top structure 4b. The base surface SB is in this embodiment arranged as a surface extending around the base structures 4a of the plurality of grip elements 4.

[0060] In the embodiment shown in figure 4b, the base structure 4a and the top structure 4b are arranged with oval shapes, with the top structure 4b configured as a flat surface, or an essentially flat surface. The side structure 4c is arranged as a curved surface, extending from the base structure 4a to the top structure 4b. The base surface SB is in this embodiment arranged as a surface extending around the base structures 4a of the plurality of grip elements 4.

[0061] In other embodiments, the cellulose products 1 are arranged with a structured zone 3 formed by a base surface SB and a plurality of grip elements 4 arranged as tapered elements, each comprising a base structure 4a, a top structure 4b, and a side structure 4c extending between the base structure 4a and the top structure 4b. The grip elements 4 have a tapering configuration from the base structure 4a towards the top structure 4b, and the top structure 4b is arranged as a curved surface.

[0062] In the embodiment illustrated in figures 5a-b, the structured zone 3 has an irregular structural configuration formed by the grip elements 4, where the top structure 4b is arranged as a curved surface, such as an orange peel like or similar structural configuration formed by the grip elements 4. The side structures 4c are arranged as irregular surfaces, extending from the base structure 4a to the top structure 4b. The base surface SB is in this embodiment arranged as a surface extending between the base structures 4a of the plurality of grip elements 4.

[0063] In other embodiments, the cellulose products 1 are arranged with a structured zone 3 formed by a base surface SB and a plurality of grip elements 4 arranged as tapered elements, each comprising a base structure 4a, a top structure 4b, and a side structure 4c extending between the base structure 4a and the top structure 4b. The grip elements 4 have a tapering configuration from the base structure 4a towards the top structure 4b, and the top structure 4b may be arranged as a flat surface, an essentially flat surface, or a curved surface.

[0064] In the embodiment illustrated in figure 6a-b, the grip elements 4 are configured as elongated ridge structures SER, with the top structure 4b arranged as a flat surface, or an essentially flat surface. The side structures 4c are arranged as elongated side surfaces, extending from the base structure 4a to the top structure 4b. The base surface SB is in this embodiment arranged as a surface extending between the base structures 4a of the plurality of grip elements 4.

[0065] In the embodiment illustrated in figure 7a-b, the grip elements 4 are configured as elongated ridge structures SER, with the top structure 4b arranged as a curved surface. The side structures 4c are arranged as elongated side surfaces, extending from the base structure 4a to the top structure 4b. The base surface SB is in this embodiment arranged as a surface extending between the base structures 4a of the plurality of grip elements 4.

[0066] For the different embodiments, the base surface SB is suitably arranged in a fist plane Pi, and the top structures 4b of the grip elements 4 are forming a second plane P2 arranged at a distance D from the first plane Pi. This configuration of the structured zone 3 is schematically illustrated in figures 2b, 5b, 6b and 7b.

[0067] Suitably, the distance D between the first plane Pi and the second plane P2 is in the range of 0,08-0,2 mm. The grip elements 4 can have any suitable shape or form, as mentioned in the description. The distance between the grip elements 4 may vary dependent on form and shape of the grip elements, but is in the millimetre range. For example, the distance between the grip elements 4 at the base structure 4a plane, i.e. the first plane P1 , of the gripping element may for example be in the range 0.1-4 mm. Dependent on shape and form, the distance between the grip elements 4 at the top structure 4b plane, i.e. the second plane P2, is advantageously larger than at the first plane P1 since the side structures 4c advantageously slants inwardly starting from the base structure 4a towards the top structure 4b, as mentioned in the description. The amount of grip elements per surface area can vary dependent on design of the pattern. As shown in the figures, the pattern can be in the form of diagonal grooves and ridges. In such a design a suitable pitch between the ridges are in the range 1-5 mm, preferably between 2-3 mm. In a pattern with diagonal groves and ridges running across each other, i.e. forming a web-like pattern on a surface extending in an X-Y- plane, the pitch can vary or be the same in X-direction and the Y-direction. In one example which has proven promising, the pitch in the X-direction is 3.8 mm and in the Y-direction 1 ,4mm in a grip element area, i.e. the structured zone, with around 20 grip elements per square centimetre. However, the above example numbers are a design choice and the pattern can typically have a pitch in the X-direction in the range 1-5 mm and a pitch in the Y-direction in the range 1-5 mm with 15-25 grip elements per square centimetre for a pattern similar to the web-like pattern.

[0068] The grip elements 4 suitably have a height H between the base structure 4a and the top structure 4b in the range of 0,08-0,2 mm. The base structure 4a has a thickness that varies with the height H of the grip elements 4. The thickness of the base structure 4a is typically 50-90% of the total height, i.e. thickness, of the base structure and the height H of the grip element in order not to jeopardize the overall strength of the product in the grip element area.

[0069] In other non-illustrated embodiments, the cellulose product 1 may be arranged with an outer side 1 b comprising two or more structured zones 3, each formed by a base surface SB and a plurality of grip elements 4.

[0070] The cellulose product 1 is dry-formed from cellulose fibres CF in a forming mould M. Suitably, the cellulose fibres CF are arranged into a cellulose blank structure 2 before being inserted in the forming mould M for an efficient handling of the cellulose fibres CF. An embodiment of a forming mould M is illustrated in figures 8a-d and 9a-b.

[0071] The cellulose blank structure 2 is air-formed from the cellulose fibres CF. With an airformed cellulose blank structure 2 is meant an essentially air-formed fibrous web structure produced from cellulose fibres CF, where the cellulose fibres CF are carried and formed to the cellulose blank structure 2 by air as carrying medium. The cellulose blank structure 2 comprises loose and separated cellulose fibres CF that are compressed upon forming of the cellulose products 1 in the forming mould. With loose and separated cellulose fibres is meant cellulose fibres that are separated from each other, and where the cellulose fibres are loosely arranged relative to each other within the cellulose blank structure 2. The loose and separated cellulose fibres may include cellulose fibres or cellulose fibre bundles that are separated from each other and loosely arranged relative to each other within the cellulose blank structure 2.

[0072] The cellulose fibres CF may originate from a suitable cellulose raw material, such as a pulp material. Suitable pulp materials are for example fluff pulp, paper structures, or other cellulose fibre containing structures. The cellulose fibres CF may also be extracted from agricultural waste materials, for example wheat straws, fruit and vegetable peels, bagasse, or from other suitable sources. When for example using pulp as raw material for the cellulose blank structure 2, the pulp structure commonly needs to be separated in a separating unit, such as a suitable mill unit, before the airforming of the cellulose blank structure 2. In the separating unit, the pulp structure is separated into individual cellulose fibres, or into individual cellulose fibres and cellulose fibre bundles, and the better milling process the more individual cellulose fibres are produced. In other embodiments, only individual cellulose fibres may be used as raw material for the cellulose blank structure 2. With air-forming of the cellulose blank structure 2 is meant the formation of the cellulose blank structure in a dry and controlled fibre forming process in which the cellulose fibres CF are air-formed to produce the cellulose blank structure 2. When forming the cellulose blank structure 2 in the air-forming process, the cellulose fibres CF are carried and formed to the cellulose blank structure 2 by air as carrying medium. It should be understood that even if the cellulose blank structure 2 is slightly compacted before the forming of the cellulose products 1 in the forming mould M, such as compacting the cellulose blank structure 2 for feeding or transportation purposes, the cellulose blank structure 2 still comprises loose and separated cellulose fibres.

[0073] The air-forming process for forming the cellulose blank structure 2 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. In 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 products, but air is still used as carrying medium in the forming process. The cellulose blank structure 2 may, if suitable have a dryness that is mainly corresponding to the ambient humidity in the atmosphere surrounding the air-formed cellulose blank structure 2. As an alternative, the dryness of the cellulose blank structure 2 can be controlled in order to have a suitable dryness level when forming the cellulose products 1 in the forming mould M.

[0074] The air-formed cellulose blank structure 2 may be formed of cellulose fibres in a conventional air-forming process or in a cellulose blank air-forming module. The cellulose blank structure 2 may have a composition where the cellulose fibres CF are of the same origin or alternatively contain a mix of two or more types of cellulose fibres CF. The cellulose fibres CF used in the cellulose blank structure 2 are during the forming process of the cellulose products 1 in the forming mould M bonded or interconnected to each other with hydrogen bonds into the three-dimensional compressed fibre structure CSD, due to applied forming pressure and forming temperature together with adequate moist content in the cellulose blank structure 2. The cellulose fibres CF may be mixed with other substances to a certain amount. With cellulose fibres is meant any type of cellulose fibres, such as natural cellulose fibres or manufactured cellulose fibres. The cellulose blank structure 2 may specifically comprise at least 95% dry weight cellulose fibres, or more specifically at least 99% dry weight cellulose fibres.

[0075] The air-formed cellulose blank structure 2 may have a single-layer or a multi-layer configuration. A cellulose blank structure 2 having a single-layer configuration is referring to a structure that is formed of one layer containing cellulose fibres CF. A cellulose blank structure 2 having a multi-layer configuration is referring to a structure that is formed of two or more layers comprising cellulose fibres, where the layers may have the same or different compositions or configurations.

[0076] The one or more air-formed layers of the cellulose blank structure 2 are fluffy and airy structures, where the cellulose fibres CF forming the structures are arranged relatively loosely relative to each other. The fluffy cellulose blank structure 2 are used for an efficient dry-forming of the cellulose products 1 , allowing the cellulose fibres CF to form the cellulose products 1 in an efficient way during the dry-forming process in the forming mould M. To dry-form the cellulose products 1 from the air-formed cellulose blank structure 2 in the forming mould M, the cellulose blank structure 2 containing the cellulose fibres CF is first provided from a suitable source and thereafter arranged in the forming mould M. The cellulose blank structure 2 may be air-formed from cellulose fibres CF and arranged on rolls or in stacks. The rolls or stacks may thereafter be arranged in connection to the forming mould M. As an alternative, the cellulose blank structure 2 may be air-formed from cellulose fibres CF in a non-illustrated cellulose blank airforming module arranged in connection to the forming mould M.

[0077] Suitably, the forming mould M is operated intermittently for dry-forming the cellulose products 1 from the cellulose fibres CF in the cellulose blank structure 2. In the embodiment illustrated in figures 8a-d and 9a-b, the forming mould M comprises a first mould part Mi and a corresponding second mould part M2 that are cooperating for forming the cellulose products 1 from the cellulose fibres CF. The first mould part Mi and the second mould part M2 are movably arranged relative to each other, and the first mould part Mi and the second mould part M2 are configured for moving relative to each other in a pressing direction Dp.

[0078] In the embodiment shown in figures 8a-d, the second mould part M2 is stationary and the first mould part Mi is movably arranged in relation to the second mould part M2 in the pressing direction DP, during a pressing operation OP. The first mould part Mi is configured to move both towards the second mould part M2 and away from the second mould part M2 in linear movements along an axis extending in the pressing direction DP.

[0079] It should be understood that for all embodiments according to the disclosure, the expression moving in the pressing direction DP includes a movement in the pressing direction DP, and the movement may take place in opposite directions. The expression may further include both linear and non-linear movements of a mould part, where the result of the movement during forming is a repositioning of the mould part in the pressing direction Dp.

[0080] The forming mould M is configured for dry-forming the cellulose product 1 into the three-dimensional compressed fibre structure CSD in the pressing operation OP from the cellulose fibres CF in the cellulose blank structure 2, by pressing and heating the cellulose fibres CF with a forming pressure Pp and applying a forming temperature Tp onto the cellulose fibres CF. The forming mould M is applying the forming pressure PF by pressing the cellulose blank structure 2 between the first mould part Mi and the second mould part M2, as shown in figure 8c. The forming mould M is further applying the forming temperature TF onto the cellulose blank structure 2 in the pressing operation OP.

[0081] With the expression pressing operation OP is meant the operation of the mould parts for forming a cellulose product 1 from the cellulose fibres CF. In the embodiment shown in figures 8a-d, the pressing operation OP starts when the first mould part Mi is moved from a stationary position. In this position, as illustrated in figure 8a, the first mould part Mi and the second mould part M2 are arranged at a distance from each other and a section of the cellulose blank structure 2 is fed into the forming mould M, as illustrated with the arrow in figure 8a. The cellulose blank structure 2 is in this way fed between the first mould part Mi and the second mould part M2, as shown in figure 8b into a position where the cellulose product 1 can be formed from the cellulose fibres CF in the cellulose blank structure 2. When the feeding of the cellulose blank structure 2 has been stopped in the position shown in figure 8b, the first mould part Mi is moved towards the second mould part M2 for applying the forming pressure PF and the forming temperature TF onto the cellulose fibres CF in the cellulose blank structure 2, as shown in figure 8c. When the forming pressure PF and forming temperature TF are applied onto the cellulose fibres CF, the cellulose product 1 is formed in the forming mould M. The cellulose product 1 may be formed into any suitable shape in the forming mould M, such as three-dimensional shapes.

[0082] When the cellulose product 1 has been formed in the forming mould M, the first mould part Mi is moved away from the second mould part M2 back to the stationary position, as shown in figure 8d. When the first mould part Mi has reached the stationary position again, the pressing operation OP is completed. The pressing operation OP is thus defined as a pressing cycle during which the cellulose fibres CF are exerted to the forming pressure PF, and the duration of the pressing operation OP is suitably calculated from the start of the movement of the first mould part Mi from the stationary position until the first mould part Mi has reached the stationary position again.

[0083] After a completed pressing operation OP, the cellulose product 1 is removed from the forming mould M, as shown in figure 8d. Thereafter a new section of the cellulose blank structure 2 is fed into the forming mould M between the first mould part Mi and the second mould part M2, and a new pressing operation OP is initiated for a repeated operation of the forming mould M. In this way, the forming mould M is intermittently operated in a sequence of pressing operations OP following each other and the cellulose blank structure 2 is intermittently fed to the forming mould M between the pressing operations OP.

[0084] The forming mould M is in the pressing operation OP dry-forming the cellulose product 1 into the three-dimensional compressed fibre structure CSD by pressing and heating the cellulose blank structure 2 with a forming pressure Pp in the range of 1-600 MPa, preferably in the range of 1-100 MPa, more preferably in the range of 4-20 MPa, and a forming temperature Tp in the range of 60-300 °C, preferably in the range of 100- 200 °C, more preferably in the range of 120-170 °C. In this way, the cellulose fibres CF in the cellulose blank structure 2 are integrated into the three-dimensional compressed fibre structure CSD.

[0085] The cellulose product 1 is dry-formed in the forming mould M by applying a forming pressure Pp and a forming temperature Tp onto the cellulose fibres CF for interconnecting the cellulose fibres CF into the three-dimensional compressed fibre structure CSD. Upon dry-forming in the forming mould M, the cellulose product 1 is formed with an inner side 1a and an outer side 1 b, where the inner side 1a is delimiting an inner volume 1c, as exemplified in the different embodiments above. The outer side 1 b of the cellulose product 1 is formed with at least one structured zone 3, and the at least one structured zone 3 comprises a base surface SB and a plurality of grip elements 4.

[0086] As described above, the forming mould M comprises a first mould part Mi and a second mould part M2 configured for interacting with each other upon dry-forming of the cellulose product 1 by applying a forming pressure Pp and a forming temperature Tp onto the cellulose fibres CF. By applying the forming pressure Pp and the forming temperature Tp onto the cellulose fibres CF the cellulose fibres CF are interconnected into the three-dimensional compressed fibre structure CSD.

[0087] The first mould part Mi and / or the second mould part M2 comprises at least one structured section 5 configured for forming at least one structured zone 3 on the outer side 1 b of the cellulose product 1 , with the structured zone 3 having a base surface SB and a plurality of grip elements 4. Thus, the at least one structured zone 3 is formed by means of at least one corresponding structured section 5. The structured section 5 of the forming mould M is enabling the forming of the structured zone 3. The structured section 5 is suitably arranged as a structured or patterned part of the forming mould M, and the structured or patterned part is corresponding to the configuration of the structured zone 3 that is formed in the cellulose product 1 during the dry-forming process in the forming mould M.

[0088] The at least one structured section 5 is configured for forming the grip elements 4 as protruding elements P extending from the base surface SB. The at least one structured section 5 comprises shaping elements 5a corresponding to the protruding elements P and the base surface SB. The structured section 5 is arranged as a patterned or structured part of the forming mould, where the structural shape of the shaping elements 5a is forming the protruding elements P.

[0089] An exemplified embodiment of a forming mould M is illustrated more in detail in figures 8a-d and 9a-b, where the forming mould M comprises a first mould part Mi and a second mould part M2 configured for interacting with each other upon dry-forming of the cellulose product 1. In this embodiment, the first mould part Mi comprises a first pressing surface 6a that is having a shape corresponding to the inner side 1a of the dry-formed cellulose product 1 , as shown in figure 8a. The second mould part M2 comprises a second pressing surface 6b that is having a shape corresponding to the outer side 1b of the dry-formed cellulose product 1 , as shown in figure 8a. The second pressing surface 6b of the second mould part M2 comprises a structured section 5 that is forming the structured zone 3 on the outer side 1 b of the cellulose product 1 , where the structured zone 3 comprises a base surface SB and a plurality of grip elements 4, as described in the embodiments above.

[0090] In the embodiment shown in figures 8a-d and 9a-b, the second mould part M2 of the forming mould M is arranged with the structured section 5 comprising the shaping elements 5a for forming the plurality of grip elements 4 configured as truncated pyramid structures SPT. The grip elements 4 are, as exemplified above in connection to figures 2a-c, arranged as tapered elements, each comprising a base structure 4a, a top structure 4b, and a side structure 4c extending between the base structure 4a and the top structure 4b. The grip elements 4 have a tapering configuration from the base structure 4a towards the top structure 4b, and the top structure 4b is arranged as a flat surface, or an essentially flat surface. The structured section 5 of the second pressing surface 6b is in the shown embodiment is forming a base surface SB and a plurality of grip elements 4, where the plurality of grip elements 4 comprise a base structure 4a and a top structure 4b arranged with quadrangular shapes, and a side structure 4c extending between the base structure 4a and the top structure 4b, as exemplified in figure 2a-c. The formed grip elements 4 have a tapering configuration from the base structure 4a towards the top structure 4b.

[0091] During the pressing operation OP in the forming mould M, the grip elements 4 are formed as protruding elements P extending from the base surface SB by means of the structured section 5 The structured section 5 comprises the shaping elements 5a corresponding to the protruding elements P and the base surface SB, as illustrated in figures 9a-b.

[0092] During the pressing operation OP, the base surface SB is integrated into the compressed fibre structure CSD of the cellulose product 1 by compressing the indentations I between the grip elements 4 upon dry-forming the cellulose product 1 in the forming mould M, where the compressed indentations I suitably have a higher density than the grip elements 4.

[0093] For the different embodiments, a suitable forming mould M is used, where the forming mould M comprises at least one structured section 5 configured for forming the grip elements 4 as tapered elements, each comprising a base structure 4a, a top structure 4b, and a side structure 4c extending between the base structure 4a and the top structure 4b, where the grip elements 4 have a tapering configuration from the base structure 4a towards the top structure 4b. The cellulose product 1 is dry-formed into the three-dimensional compressed fibre structure CSD by pressing and heating the cellulose fibres CF in the forming mould M with a forming pressure Pp in the range of 1-600 MPa, preferably in the range of 1-100 MPa, more preferably in the range of 4- 20 MPa, and with a forming temperature Tp in the range of 60-300 °C, preferably in the range of 100-200 °C, more preferably in the range of 120-170 °C.

[0094] Suitably, the cellulose product 1 is dry-formed into the three-dimensional compressed fibre structure CSD in a single pressing operation by pressing and heating the cellulose fibres CF in the forming mould M with the forming pressure Pp and the forming temperature Tp. In this way, the forming pressure Pp and the forming temperature Tp are applied onto the cellulose fibres CF during a single pressing operation upon forming of the cellulose product 1 in the forming mould M. With a single pressing operation is meant that the cellulose product 1 is formed from the cellulose fibres CF in one single pressing step in the forming mould M. In the single pressing operation, the first mould part Mi and the second mould part M2 are interacting with each other for establishing the forming pressure PF and the forming temperature TF during a single operational engagement step. Thus, in the single pressing operation, the forming pressure PF and the forming temperature TF are not applied to the cellulose fibres CF in two or more repeated pressing steps. The cellulose fibres CF have a moisture content in the range of 4-20 wt%, preferably in the range of 6-15 wt%, when arranged in the forming mould M.

[0095] It will be appreciated that the above description is merely exemplary in nature and is not intended to limit the present disclosure, its application or uses. While specific examples have been described in the specification and illustrated in the drawings, it will be understood by those of ordinary skill in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present disclosure as defined in the claims. Furthermore, modifications may be made to adapt a particular situation or material to the teachings of the present disclosure without departing from the essential scope thereof. Therefore, it is intended that the present disclosure not be limited to the particular examples illustrated by the drawings and described in the specification as the best mode presently contemplated for carrying out the teachings of the present disclosure, 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.

[0096] REFERENCE SIGNS

[0097] 1 : Cellulose product

[0098] 1a: Inner side

[0099] 1b: Outer side

[0100] 1c: Inner volume

[0101] 2: Cellulose blank structure

[0102] 3: Structured zone

[0103] 4: Grip elements

[0104] 4a: Base structure

[0105] 4b: Top structure

[0106] 4c: Side structure

[0107] 5: Structured section

[0108] 5a: Shaping elements

[0109] 6a: First pressing surface

[0110] 6b: Second pressing surface

[0111] A: Article

[0112] CSD: Compressed fibre structure

[0113] CF: Cellulose fibre

[0114] D: Distance

[0115] Dp: Pressing direction

[0116] H: Height

[0117] M: Forming mould

[0118] M First mould part

[0119] M2: Second mould part

[0120] SB: Base surface

[0121] P: Protruding elements

[0122] PF: Forming pressure

[0123] P1 : First plane

[0124] P2: Second plane

[0125] SER: Elongated ridge structure

[0126] SCT: Truncated cone structure

[0127] SPT: Truncated pyramid structure

[0128] Tp: Forming temperature

Claims

CLAIMS1. A dry-formed cellulose product (1) comprising interconnected cellulose fibres (CF), wherein the cellulose product (1) is arranged as a three-dimensional compressed fibre structure (CSD) with an inner side (1a) and an outer side (1 b), wherein the inner side (1a) is delimiting an inner volume (1c) configured for holding one or more articles (A), wherein the outer side (1b) comprises at least one structured zone (3), wherein the at least one structured zone (3) is formed by a base surface (SB) and a plurality of grip elements (4).

2. The dry-formed cellulose product (1) according to claim 1 , wherein the grip elements (4) are arranged as protruding elements (P) extending from the base surface (SB).

3. The dry-formed cellulose product (1) according to claim 2, wherein the base surface (SB) is integrated in the compressed fibre structure (CSD) of the cellulose product (1) and arranged as compressed indentations (I) between the grip elements (4).

4. The dry-formed cellulose product (1) according to claim 3, wherein the compressed indentations (I) have a higher density than the protruding elements (P).

5. The dry-formed cellulose product (1) according to any preceding claim, wherein the grip elements (4) are integrated in the compressed fibre structure (CSD) of the cellulose product (1).

6. The dry-formed cellulose product (1) according to any preceding claim, wherein the grip elements (4) are arranged as tapered elements, each comprising a base structure (4a), a top structure (4b), and a side structure (4c) extending between the base structure (4a) and the top structure (4b), wherein the grip elements (4) have a tapering configuration from the base structure (4a) towards the top structure (4b).

7. The dry-formed cellulose product (1) according to claim 6, wherein the top structure (4b) is arranged as a flat surface, or an essentially flat surface.

8. The dry-formed cellulose product (1) according to claim 7, wherein the grip elements (4) are configured as truncated pyramid structures (SPT).

9. The dry-formed cellulose product (1) according to claim 8, wherein the base structure (4a) and the top structure (4b) are arranged with triangular shapes, and / or wherein the base structure (4a) and the top structure (4b) are arranged with quadrangular shapes, and / or wherein the base structure (4a) and the top structure (4b) are arranged with pentagonal shapes, and / or wherein the base structure (4a) and the top structure (4b) are arranged with hexagonal shapes.

10. The dry-formed cellulose product (1) according to any of claims 7 to 9, wherein the grip elements (4) are configured as truncated cone structures (SCT).

11. The dry-formed cellulose product (1) according to claim 10, wherein the base structure (4a) and the top structure (4b) are arranged with circular shapes, and / or wherein the base structure (4a) and the top structure (4b) are arranged with oval shapes.

12. The dry-formed cellulose product (1) according to claim 6, wherein the top structure (4b) is arranged as a curved surface.

13. The dry-formed cellulose product (1) according to claim 12, wherein the structured zone (3) has an orange peel like structural configuration formed by the grip elements (4).

14. The dry-formed cellulose product (1) according to any of claims 6 to 13,wherein the grip elements (4) are configured as elongated ridge structures (SER).

15. The dry-formed cellulose product (1) according to any of claims 6 to 14, wherein the base surface (SB) is arranged in a fist plane (Pi), wherein the top structures (4b) of the grip elements (4) are forming a second plane (P2) arranged at a distance (D) from the first plane (Pi).

16. The dry-formed cellulose product (1) according to claim 15, wherein the distance (D) between the first plane (Pi) and the second plane (P2) is in the range of 0,08-0,2 mm.

17. The dry-formed cellulose product (1) according to any of claims 6 to 16, wherein the grip elements (4) have a height (H) between the base structure (4a) and the top structure (4b) in the range of 0,08-0,2 mm.

18. A method for dry-forming a cellulose product (1) from cellulose fibres (CF) in a forming mould (M), wherein the method comprises the steps: providing the cellulose fibres (CF) and arranging the cellulose fibres (CF) in the forming mould (M); dry-forming the cellulose product (1) in the forming mould (M) by applying a forming pressure (PF) and a forming temperature (TF) onto the cellulose fibres (CF) for interconnecting the cellulose fibres (CF) into a three- dimensional compressed fibre structure (CSD), wherein upon dry-forming the cellulose product (1) is formed with an inner side (1a) and an outer side (1 b), wherein the inner side (1a) is delimiting an inner volume (1c), and wherein the outer side (1 b) is formed with at least one structured zone (3), wherein the at least one structured zone (3) comprises a base surface (SB) and a plurality of grip elements (4).

19. The method according to claim 18, wherein the method further comprises the steps: dry-forming the cellulose product (1) into the three-dimensional compressed fibre structure (CSD) by pressing and heating the cellulose fibres (CF) in the forming mould (M) with aforming pressure (PF) in the range of 1-600 MPa, preferably in the range of 1-100 MPa, more preferably in the range of 4-20 MPa, and with a forming temperature (TF) in the range of 60-300 °C, preferably in the range of 100-200 °C, more preferably in the range of 120-170 °C.

20. The method according to claim 18 or 19, wherein the method further comprises the steps: forming the cellulose product (1) into the three-dimensional compressed fibre structure (CSD) in a single pressing operation by pressing and heating the cellulose fibres (CF) in the forming mould (M) with the forming pressure (PF) and the forming temperature (TF).

21. The method according to any of claims 18 to 20, wherein the cellulose fibres (CF) have a moisture content in the range of 4-20 wt%, preferably in the range of 6-15 wt%, when arranged in the forming mould (M).

22. The method according to any of claims 18 to 21 , wherein the forming mould (M) comprises at least one structured section (5), wherein the method further comprises the step: forming the at least one structured zone (3) by means of at least one corresponding structured section (5).

23. The method according to claim 22, wherein the method further comprises the step: forming the grip elements (4) as protruding elements (P) extending from the base surface (SB) by means of the structured section (5), wherein the structured section (5) comprises shaping elements (5a) corresponding to the protruding elements (P) and the base surface (SB).

24. The method according to any of claims 18 to 23, wherein the method further comprises the steps: integrating the base surface (SB) into the compressed fibre structure (CSD) of the cellulose product (1) by compressing indentations (I) between the grip elements (4) upon dry-formingthe cellulose product (1) in the forming mould (M), wherein the compressed indentations (I) have a higher density than the grip elements (4).

25. The method according to any preceding claim, wherein the method further comprises the step: forming the grip elements (4) as tapered elements, each comprising a base structure (4a), a top structure (4b), and a side structure (4c) extending between the base structure (4a) and the top structure (4b), wherein the grip elements (4) have a tapering configuration from the base structure (4a) towards the top structure (4b).

26. A forming mould (M) for dry-forming a cellulose product (1) from cellulose fibres (CF), wherein the cellulose product (1) is arranged as a three-dimensional compressed fibre structure (CSD) with an inner side (1a) and an outer side (1b), wherein the forming mould (M) comprises a first mould part (Mi) and a second mould part (M2) configured for interacting with each other upon dryforming of the cellulose product (1) by applying a forming pressure (PF) and a forming temperature (TF) onto the cellulose fibres (CF) for interconnecting the cellulose fibres (CF) into the three-dimensional compressed fibre structure (CSD), wherein the first mould part (Mi) and / or the second mould part (M2) comprises at least one structured section (5) configured for forming at least one structured zone (3) having a base surface (SB) and a plurality of grip elements (4) on the outer side (1b) of the cellulose product (1).

27. The forming mould (M) according to claim 26, wherein the at least one structured section (5) is configured for forming the grip elements (4) as protruding elements (P) extending from the base surface (SB), wherein the structured section (5) comprises shaping elements (5a) corresponding to the protruding elements (P) and the base surface (SB).

28. The forming mould (M) according to claim 26 or 27, wherein the at least one structured section (5) is configured for forming the grip elements (4) as tapered elements, each comprising a base structure (4a), a top structure (4b), and a side structure (4c) extending between the basestructure (4a) and the top structure (4b), wherein the grip elements (4) have a tapering configuration from the base structure (4a) towards the top structure (4b).

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