EP4520496A1 - Vorrichtung zur trockenherstellung von steifen zelluloseprodukten - Google Patents

Vorrichtung zur trockenherstellung von steifen zelluloseprodukten Download PDF

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Publication number
EP4520496A1
EP4520496A1 EP23196469.3A EP23196469A EP4520496A1 EP 4520496 A1 EP4520496 A1 EP 4520496A1 EP 23196469 A EP23196469 A EP 23196469A EP 4520496 A1 EP4520496 A1 EP 4520496A1
Authority
EP
European Patent Office
Prior art keywords
mould part
cellulose
wall surface
cellulose blank
friction coefficient
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23196469.3A
Other languages
English (en)
French (fr)
Inventor
Adam Johansson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yangi AB
Original Assignee
Yangi AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yangi AB filed Critical Yangi AB
Priority to EP23196469.3A priority Critical patent/EP4520496A1/de
Priority to PCT/EP2024/074942 priority patent/WO2025056425A1/en
Publication of EP4520496A1 publication Critical patent/EP4520496A1/de
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/59—Shaping sheet material under pressure
    • B31B50/592—Shaping sheet material under pressure using punches or dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/20—Moulding or pressing characterised by using platen-presses
    • B27N3/203—Moulding or pressing characterised by using platen-presses with heating or cooling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N5/00—Manufacture of non-flat articles
    • B27N5/02—Hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/0077—Shaping by methods analogous to moulding, e.g. deep drawing techniques
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/12—Moulding of mats from fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/20—Moulding or pressing characterised by using platen-presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N5/00—Manufacture of non-flat articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2100/00—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs
    • B31B2100/002—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs characterised by the shape of the blank from which they are formed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2110/00—Shape of rigid or semi-rigid containers
    • B31B2110/10—Shape of rigid or semi-rigid containers having a cross section of varying size or shape, e.g. conical or pyramidal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2120/00—Construction of rigid or semi-rigid containers
    • B31B2120/002—Construction of rigid or semi-rigid containers having contracted or rolled necks, having shoulders

Definitions

  • the present invention relates in general to the field of apparatus for dry manufacturing of rigid cellulose products having non-flat general shape from a cellulose blank.
  • the cellulose products may be used for packaging, storing, transporting and/or displaying other products such as electronics, tools, jewelry, food, dairy products, cosmetics, etc., and/or may be used as single/multiple use disposable articles.
  • the apparatus is defined to provide rigid cellulose products having a considerable depth.
  • the apparatus comprises a moulding tool having a male mould part and a female mould part having co-operating designs, wherein at least one of the male mould part and the female mould part is displaceable in an axial direction in relation to the other in order to press the cellulose blank therebetween into final shape by applying a predetermined pressure P in the axial direction of the moulding tool, wherein the male mould part comprises a main projection having a bottom surface, a wall surface extending essentially in the axial direction, and a transitional edge surface located between the bottom surface and the wall surface, and wherein the female mould part comprises a main recess having a bottom surface, a wall surface extending essentially in the axial direction, and a transitional edge surface located between the bottom surface and the wall surface.
  • a biomaterial commonly used for packaging and disposable articles is wet moulded pulp based on cellulose fibres.
  • Such wet moulded pulp has the advantage of being considered as a sustainable material, since it is produced from biomaterials and can be recycled after use.
  • Wet moulded pulp comprises more or less only water and separated cellulose fibers, and consequently, wet moulded pulp has been popular to use for primary packaging applications (packaging next to the article), for secondary packaging applications (assembly of such primary packages), as well as for manufacturing of disposable articles/products.
  • One advantage of using wet-forming techniques is that the moulding tool is filled with a wet cellulose slurry and thereafter the cellulose slurry is dried and obtains the shape of the moulding tool without any risk of cracking of the moulded cellulose product at the transitional edge portion between the bottom and the wall.
  • dry-forming techniques wherein rigid cellulose products are manufactured from separated cellulose fibres that are introduced into a product forming unit in the shape of a cellulose blank/web, wherein the cellulose blank is moulded/formed into the shape of the intended cellulose product and wherein the cellulose fibres are bonded to each other using heat and pressure.
  • the dry-forming techniques comprises different steps of generating an air-laid cellulose blank, that is fed into a product forming unit, i.e. a thermo-forming press.
  • One known way to try to solve the problem of cracked cellulose products is to provide a coating or the like to both the projection of the male mould part and the recess of the female mould part, in order to decrease the friction between the cellulose blank and the moulding tool in order to counteract material draw and elongation.
  • Such measures may have some positive effect during moulding/pressing of shallow cellulose products having uncomplicated design.
  • the inventors of the present invention have concluded by thorough research that such measures do not have any beneficial effect on the problem concerning material draw and elongation during moulding/pressing rigid cellulose products having non-flat general shape and a considerable depth, on the contrary it has negative effect resulting in more cracks in the transitional edge portion of the cellulose product.
  • the present invention aims at obviating the aforementioned and other disadvantages and failings of previously known apparatus for dry manufacturing rigid cellulose products, and at providing an improved apparatus for dry manufacturing rigid cellulose products having non-flat general shape and a considerable depth.
  • a primary object of the present invention is to provide an improved apparatus for dry forming/manufacturing rigid cellulose products having non-flat general shape and a considerable depth, wherein the environmental benefits as well as time and energy saving benefits of conventional dry-forming techniques are maintained. It is another object of the present invention to provide an improved apparatus for dry forming/manufacturing rigid cellulose products having non-flat general shape and a considerable depth, wherein the moulded/pressed rigid cellulose product is free from cracks at the bottom region and at the transitional edge regions between the bottom and the wall.
  • an apparatus of the initially defined type wherein the friction coefficient between the wall surface of the male mould part and the cellulose blank is higher than the friction coefficient between the wall surface of the female mould part and the cellulose blank.
  • the present invention is based on the insight that it is of uttermost importance to have different surface finish/friction at different parts of the moulding tool.
  • the inventors have discovered that it is important that the relative speed/displacement between the projection of the male mould part and the cellulose blank has to be less than the relative speed/displacement between the recess of the female mould part and the cellulose blank, in order to prevent the projection of the male mould part from generating cracks at the bottom region and the transitional edge region of the cellulose product.
  • the friction coefficient between the transitional edge surface of the male mould part and the cellulose blank is higher than the friction coefficient between the transitional edge surface of the female mould part and the cellulose blank.
  • the greatest mutual displacement between the projection of the male mould part and the recess of the female mould part in the direction perpendicular to the thickness of the cellulose blank is at the walls of the mould parts, but also at the transitional edge region of the cellulose product there is a mutual displacement between the projection of the male mould part and the recess of the female mould part in a direction perpendicular to the thickness of the cellulose blank and thereby it is further advantageous to have greater friction between the male mould part and the cellulose blank than between the female mould part and the cellulose blank also at the transitional edge region of the cellulose product.
  • the wall surface and the transitional edge surface of the male mould part is naked metal, and thereto it is preferred that the wall surface and the transitional edge surface of the female mould part comprises a surface treatment means in order to decrease the friction coefficient between the wall surface and the transitional edge surface of the female mould part and the cellulose blank.
  • the friction coefficient between the bottom surface of the male mould part and the cellulose blank is lower than the friction coefficient between the wall surface of the male mould part and the cellulose blank.
  • the male mould part comprises a brim surface at a distal end of the wall surface
  • the female mould part comprises a brim surface at a distal end of the wall surface, wherein the friction coefficient between the brim surface of the male mould part and the cellulose blank is lower than the friction coefficient between the brim surface of the female mould part and the cellulose blank.
  • air/dry moulding/forming or air/dry laying/laid means a well-known method according to which separated cellulose fibres are formed into a cellulose blank/sheet.
  • figure 1 disclose a schematic illustration of a generic production line/apparatus for dry manufacturing rigid cellulose products, generally designated 1.
  • the production line 1 is configured for manufacturing rigid cellulose products, generally designated 2, having essentially non-flat general shape from separated cellulose fibres.
  • Such a production line/apparatus 1 may be arranged and set-up according to different well-known ways.
  • the cross section of the wall 3 in the radial plane may have any suitable shape, circular, oval, rectangular, polygonal, etc., and may differ in shape and/or dimension along the axial extension of the tray 2.
  • the tray 2 may comprise a flat bottom 6, or the bottom may comprise local ribs, projections, etc., for strength and rigidity of the cellulose product 2.
  • the bottom 6 may be located at the very lower end of the wall 3, according to figure 5 embodiment, or be located at a distance from the lower end of the wall 3, or a combination thereof.
  • the walls of the moulding tool has to be inclined in order to obtain a release angle for the cellulose product 2, and in order to obtain adequate press force to the wall region of the cellulose product 2.
  • the release angle may be equal to or less than 1 degrees per millimetre depth of the cellulose product 2, preferably equal to or less than 0,75 degrees per millimetre depth.
  • the present invention entails that the release angle may be as small as 0,35 degrees per millimetre depth.
  • the release angle shall not be below 5 degrees independently on the depth of the cellulose product 2.
  • the depth of the cellulose product 2 can be up to at least 50 millimetres, and the problem of cracking is of rare occurrence at depths less than 10 millimetres.
  • the release angle of course may be much more than 1 degrees per millimetre depth, but for such designs the problem of cracking is of rare occurrence. It shall be pointed out that the present invention is applicable also for cellulose products having minor depth, such as 0-20 millimetres.
  • Cellulose raw material 7 is provided to the production line, and is fed to a separating/ disintegrating unit 8 in order to obtain individualized/separated cellulose fibres.
  • the separated cellulose fibres are thereafter transported by an air stream/flow to a dispenser of a cellulose blank/sheet forming unit 9.
  • the cellulose fibres are laid by the dispenser on a moving or stationary perforated surface of the cellulose blank forming unit 9.
  • the cellulose fibre carrying air flow may be generated by suitable device located upstream and/or downstream the perforated surface.
  • the generated cellulose blank generally designated 10 is transported/ transferred to a product forming unit 11, whereby rigid cellulose products 2 are formed and discharged from the product forming unit 11.
  • the cellulose blank forming unit 9 may be configured to generate a continuous cellulose blank 10 and/or discontinuous/discrete cellulose blanks 10. Preferably discontinuous/discrete cellulose blanks 10 are fed into the product forming unit 11.
  • the cellulose raw material 7 may be in the form of reeled pulp or paper, bale of cellulose pulp, paper, etc. and/or sheets of paper, cellulose pulp, etc. In case said cellulose raw material 7 is in the form of sheets and/or reeled pulp or paper, it can be fed directly into the separating unit 8. However, in case said cellulose raw material 7 is in the form of a bale or compact stacks of sheets, etc. one or more shredders and/or one or more additional separating/disintegrating units 8 may be necessary to be used for separating and dosing said cellulose raw material 7 from said bale or sheets in smaller quantities. The shredder(s) prepare cellulose raw material 7 to be accepted by said separating unit 8.
  • the separating unit 8 disintegrates the cellulose raw material 7 into separated cellulose fibres.
  • Said one or plurality of shredder(s) are arranged before said one or a plurality of separating unit(s) 8, so that an output of one of said shredder is connected to an input of one of said separating units 8.
  • the shredders may be arranged in parallel to each other or in series with each other, and the disintegrating units 8 may be arranged in parallel to each other or in series with each other.
  • the shredders and the disintegrating units 8 together constitute a cellulose fibre separating unit, arranged upstream the cellulose blank forming unit 9.
  • Said cellulose raw material 7 may be constituted by virgin cellulose fibres and/or recycled cellulose fibres and may originate from wood pulps such as kraft pulp, sulphite pulp, mechanical pulp, thermomechanical pulp (TMP), chemical treated mechanical pulp, chemi-thermomechanical pulp (CTMP), and/or from non-wood pulps such as bagasse, bamboo, abaca, hemp, flax, cotton.
  • wood pulps such as kraft pulp, sulphite pulp, mechanical pulp, thermomechanical pulp (TMP), chemical treated mechanical pulp, chemi-thermomechanical pulp (CTMP), and/or from non-wood pulps such as bagasse, bamboo, abaca, hemp, flax, cotton.
  • the separating unit 8 may according to various embodiments be constituted by a hammer mill.
  • said separating unit 8 the cellulose raw material is separated into fibres having a normal length in the range of 0,5-70 mm.
  • the length of said fibres may be customized by adjusting the internal properties of the separating unit 8 and/or by choosing a different separating unit 8 and/or choosing different cellulose raw material.
  • the fibre length for wood pulp is according to various embodiments in the range 0,5-4 mm, preferably in the range 1,7-3,6 mm.
  • the fibre length for non-wood pulp is in the range 0,5-70 mm.
  • Having a pre-heating unit 14 in combination with a heated press unit 13 will speed up the manufacturing process in the product forming unit 11, and improve the quality/rigidity of the final rigid cellulose product 2.
  • the cellulose blank 10 is heated to a temperature in the range 120 - 200 °C in order to obtain adequate rigidity and strength in the final cellulose product 2.
  • the cellulose blank 10 may be generated upstream the product forming unit 11 in the same apparatus/production line and provided/transferred to the product forming unit 11, or may be generated at a separate location and provided/transferred to the product forming unit 11 via intermediate handling and storage.
  • the second mould part 16 of the moulding tool is a female mould part, i.e. having a main recess 17 for receiving the cellulose blank 10
  • the first mould part 15 of the moulding tool is a male mould part, i.e. having a main projection 18 for cooperation with said main recess 17 of the female mould part by being inserted therein, such that during the pressing/forming step the cellulose blank 10 is pressed into a final rigid non-flat shape, which may be any conceivable non-flat design/shape.
  • the male mould part 15 is located above the female mould part 16.
  • the cellulose blank 10 Radially outside the final rigid cellulose product 2, the cellulose blank 10 comprises a scrap area 25 intended to be cut off during the pressing of the cellulose product 2 or after the pressing of the cellulose product 2.
  • the scrap area may be left entirely uncompressed in the moulding tool, be partially compressed by applying a predetermined partial pressure less than said predetermined pressure P, or be fully compressed by applying said predetermined pressure P.
  • the friction coefficient between the wall surface 20 of the male mould part 15 and the cellulose blank 10 is higher than the friction coefficient between the wall surface 23 of the female mould part 15 and the cellulose blank 10.
  • the frictional force between the male mould part 15 and the cellulose blank 10 is higher than the frictional force between the female mould part 16 and the cellulose blank 10 and thereby the mutual displacement/velocity at the specific location perpendicular to the thickness of the cellulose blank 10 is higher between the female mould part 16 and the cellulose blank 10 than between the male mould part 15 and the cellulose blank 10.
  • the difference in friction coefficient entails that the wall surface 20 of the male mould part 15 is rougher and/or generates higher friction than the wall surface 23 of the female mould part 16, or in other words that the wall surface 23 of the female mould part 16 is smoother and/or generates less friction than the wall surface 20 of the male mould part 15.
  • the wall surface 20 of the male mould part 15 is naked metal, and the male mould part 15 is for instance made of steel and/or aluminium.
  • the transitional edge surface 21 of the male mould part 15 is naked metal.
  • the wall surface 23 of the female mould part 16 comprises a surface treatment means and/or is machined in order to decrease the friction coefficient between the wall surface 23 of the female mould part 16 and the cellulose blank 10.
  • the transitional edge surface 24 of the female mould part 16 comprises a surface treatment means and/or is machined in order to decrease the friction coefficient between the transitional edge surface 24 of the female mould part 16 and the cellulose blank 10.
  • Surface treatment means is for instance constituted by a coating applied to the surface in question. The coating needs to be firmly connected to the surface of the female mould part 16 in order not to contaminate the cellulose product 2.
  • the surface roughness/finish of the wall surface 20 of the male mould part 15 is preferably in the range Ra 0,8-2 micrometres, and the machined/polished wall surface 23 of the female mould part 16 is preferably in the range Ra 0,1-0,4 micrometres. It shall be pointed out that said surface roughness relationship is applied mutatis mutandis to the other parts/surfaces of the male mould part 15 and of the female mould part 16.
  • the friction coefficient between the bottom surface 19 of the male mould part 15 and the cellulose blank 10 is lower than the friction coefficient between the wall surface 20 of the male mould part 15 and the cellulose blank 10.
  • the bottom surface 19 of the male mould part 15 may comprise a surface treatment means and/or be machined in order to decrease the friction coefficient between the bottom surface 19 of the male mould part 15 and the cellulose blank 10.
  • the friction coefficient between the bottom surface 19 of the male mould part 15 and the cellulose blank 10 is essentially equal to the friction coefficient between the bottom surface 22 of the female mould part 16 and the cellulose blank 10.
  • bottom surface 22 of the female mould part 16 comprises a surface treatment means and/or is machined in order to decrease the friction coefficient between the bottom surface 22 of the female mould part 16 and the cellulose blank 10.
  • the male mould part 15 comprises a brim surface 27 at a distal end of the wall surface 20 of the main projection 18, and the female mould part 16 comprises a corresponding brim surface 28 at a distal end of the wall surface 23 of the main recess 17, wherein the friction coefficient between the brim surface 27 of the male mould part 15 and the cellulose blank 10 is lower than the friction coefficient between the brim surface 28 of the female mould part 16 and the cellulose blank 10.
  • this friction coefficient interrelationship is the opposite to the friction coefficient interrelationship between the wall surfaces of the male and female mould parts.
  • the friction coefficient between the brim surface 27 of the male mould part 15 and the cellulose blank 10 is essentially equal to the friction coefficient between the wall surface 23 of the female mould part 16 and the cellulose blank 10.
  • the friction coefficient between the brim surface 28 of the female mould part 16 and the cellulose blank 10 is essentially equal to the friction coefficient between the wall surface 20 of the male mould part 15 and the cellulose blank 10.
  • the male mould part 15 comprises a scrap surface 29 arranged radially outside the brim surface 27, wherein the friction coefficient between the scrap surface 29 of the male mould part 15 and the cellulose blank 10 is lower than the friction coefficient between the wall surface 20 of the male mould part 15 and the cellulose blank 10.
  • the female mould part 16 comprises a scrap surface 30 arranged radially outside the brim surface 28, wherein the friction coefficient between the scrap surface 30 of the female mould part 16 and the cellulose blank 10 is lower than the friction coefficient between the wall surface 20 of the male mould part 15 and the cellulose blank 10.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
EP23196469.3A 2023-09-11 2023-09-11 Vorrichtung zur trockenherstellung von steifen zelluloseprodukten Pending EP4520496A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP23196469.3A EP4520496A1 (de) 2023-09-11 2023-09-11 Vorrichtung zur trockenherstellung von steifen zelluloseprodukten
PCT/EP2024/074942 WO2025056425A1 (en) 2023-09-11 2024-09-06 Apparatus for dry manufacturing rigid cellulose products

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23196469.3A EP4520496A1 (de) 2023-09-11 2023-09-11 Vorrichtung zur trockenherstellung von steifen zelluloseprodukten

Publications (1)

Publication Number Publication Date
EP4520496A1 true EP4520496A1 (de) 2025-03-12

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EP23196469.3A Pending EP4520496A1 (de) 2023-09-11 2023-09-11 Vorrichtung zur trockenherstellung von steifen zelluloseprodukten

Country Status (2)

Country Link
EP (1) EP4520496A1 (de)
WO (1) WO2025056425A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020068108A1 (en) * 2000-12-06 2002-06-06 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Press die
WO2010000945A1 (en) * 2008-07-04 2010-01-07 Stora Enso Oyj Method of manufacturing a cardboard-based shaped piece and a mould suitable for the manufacture
WO2021156222A1 (en) * 2020-02-07 2021-08-12 Pulpac AB A forming mould system and a method for forming a cellulose product in a forming mould system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020068108A1 (en) * 2000-12-06 2002-06-06 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Press die
WO2010000945A1 (en) * 2008-07-04 2010-01-07 Stora Enso Oyj Method of manufacturing a cardboard-based shaped piece and a mould suitable for the manufacture
WO2021156222A1 (en) * 2020-02-07 2021-08-12 Pulpac AB A forming mould system and a method for forming a cellulose product in a forming mould system

Also Published As

Publication number Publication date
WO2025056425A1 (en) 2025-03-20

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