EP1815066B1 - A method and a machine for making fibre products from stock - Google Patents

A method and a machine for making fibre products from stock Download PDF

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Publication number
EP1815066B1
EP1815066B1 EP05813364A EP05813364A EP1815066B1 EP 1815066 B1 EP1815066 B1 EP 1815066B1 EP 05813364 A EP05813364 A EP 05813364A EP 05813364 A EP05813364 A EP 05813364A EP 1815066 B1 EP1815066 B1 EP 1815066B1
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EP
European Patent Office
Prior art keywords
tool
fibre product
stock
fibre
tools
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.)
Not-in-force
Application number
EP05813364A
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German (de)
English (en)
French (fr)
Other versions
EP1815066A2 (en
Inventor
Björn Nilsson
Torbjörn Hansson
Lars Graffton
Leif BÅSKMAN
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Pakit International Trading Co Inc
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Pakit International Trading Co Inc
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Publication date
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Priority to PL05813364T priority Critical patent/PL1815066T3/pl
Publication of EP1815066A2 publication Critical patent/EP1815066A2/en
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Publication of EP1815066B1 publication Critical patent/EP1815066B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard
    • D21J1/06—Drying
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J7/00—Manufacture of hollow articles from fibre suspensions or papier-mâché by deposition of fibres in or on a wire-net mould
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1303—Paper containing [e.g., paperboard, cardboard, fiberboard, etc.]

Definitions

  • the invention relates to the production of fibre products from stock and especially to three-dimensional objects such as egg cartons, and other packaging products but also to objects such as drinking cups for beverages or trays, e.g. food trays.
  • Fibre products such as for example egg boxes can be made from stock in a process where a fibre layer is created and shaped to a desired form whereafter the so shaped fibre product is dewatered and possibly subjected to some form of post-processing operation.
  • US patent No. 6103179 discloses a method for producing a fibre product which is where a first male mould is immersed in a moulding tank containing stock. By means of vacuum, a fibre layer of predetermined thickness for the fibre product is formed. The first male mould is then removed from the moulding tank. A cyclical sequence of movements is performed with a female mould in which, in a first pressing stage, the female mould is brought under force against the male mould so that a first expressing of stock water occurs following which the fibre product is transferred to the female mould which is moved to a second position. The fibre product is then subjected to a second expressing whereafter the fibre product is subjected to final drying using microwave or IR radiation.
  • US patent No. 6451235 discloses a method for forming a three dimensional fibre truss from a fibre slurry.
  • a wet-forming station which comprises a substantially rigid moveable wet-forming die with a three-dimensional first forming surface and a substantially rigid fixed wet-forming die with a second forming surface.
  • a deckle comprises a substantially rigid impermeable frame that surrounds a deckle interior space comprising a prismatic volume including a cross-sectional outline that encompasses a peripheral surface of the first die so that the moveable wet-forming die can traverse an axial length of the prismatic volume of the deckle interior space.
  • the method includes adding a predetermined quantity of fibre slurry to the slurry space and compressing at a pre-selected rate the fibre slurry contained in the slurry space. A pre-form fibre truss is then removed from the deckle interior space and moved to a truss finishing station.
  • the moist pre-form fibre truss is compacted further and dried under pressurized constraint between heated forming dies to produce the finished fibre truss.
  • a caul carries the finished fibre truss to a post-processing station.
  • the post-processing is stated to include such operations as bonding to skins.
  • US patent No. 6582562 forms the preamble of present claims 1 and 12 and discloses a method for producing moulded parts from a slurry by the use of first and second mating porous molds.
  • the first mould is moved into the slurry and a vacuum is supplied to the first mold to cause the slurry to form onto the first mold to a desired thickness.
  • the second mold is heated by hot air from a hot air source and the first and second moild are mated and a vacuum is supplied to the first and second molds during mating of the first and second molds.
  • the molded part is ejected from the first mold and the molded part travels with the second mold.
  • the second mold is moved and the vacuum on the second mold is released to permit the molded part to be separated from the second mold. This can be done in connection with a conveyor belt. It is stated that drying temperatures of 300°F can be used (corresponding to about 149°C).
  • US patent No. 6136150 discloses a method and a device for achieving a flow of stock in a moulding tank. It is stated that the moulding tank is used to produce a fibre product such as an egg carton or other packaging product. In this patent, is it proposed that a flow of stock in the moulding tank is pumped into the bottom of the moulding tank and allowed to flow up over the brim of the tank. It is stated that this results in a flow that is directed upwards and that this should be important for forming a fibre layer of even thickness on a male tool used in the method.
  • the shape of the final product can be controlled in a reliable way.
  • the final product has substantially even strength properties so that the final product does not bend easier in one direction than in another. If heat is used to dewater the fibre product, it is also desirable that the heat does not burn the surface of the fibre product. It is also desirable that vaporized water can be evacuated efficiently.
  • the method is carried out in such a way and the machine is so designed that improved control of the shape of the final product is achieved.
  • the final product also obtains substantially even properties of strength. Further objects of the invention include efficient dewatering and avoidance of burning of the surface of the final product.
  • the invention relates to a method for producing a fibre product from stock.
  • the inventive method comprises providing a first tool that is permeable to air and water and providing a second tool.
  • the second tool is heated to a surface temperature of at least 220°C.
  • a moulding tank is provided and stock is fed to the moulding tank.
  • the first tool is immersed in the stock in the tank and an embryonic fibre product is formed on the first tool by applying suction through the first tool.
  • the first tool is then removed from the stock and the first tool is brought against a second tool such that the formed fibre product is sandwiched between the first and the second tool.
  • the formed fibre product is heated by the second tool such that at least a part of the water in the formed fibre product is vaporized.
  • the formed fibre product may subsequently be subjected to at least one additional step of dewatering where the fibre product is sandwiched between a pairs of opposed tools. Water is removed from the fibre product until it has reached a dry solids content of preferably at least 70%. When the fibre product has reached a dry solids content of at least 70%, it may be subjected to final drying by microwaves. Prior to final drying by microwaves, the fibre product can be subjected to steam in order to achieve a more even moisture content.
  • no stock is fed to the moulding tank during the actual forming step by means of causing stock from a machine vat to by-pass the moulding tank during the forming step.
  • the stock from the machine vat can once again be fed to the moulding tank.
  • the forming step preferably takes 1 - 2 seconds.
  • the heating and vaporizing step that is carried out between the first tool and the second tool should preferably last for no more than 1 second.
  • the fibre product is suitably dewatered to a dry solids content of 18 - 22 % by weight, preferably 20 % by weight.
  • the stock used can suitably have a dry solids content of 0,4 - 0,7% by weight.
  • the stock has a dry solids content of 0,5% by weight.
  • a suitable stock can be made from chemithermomechanical pulp (CTMP).
  • the first tool and the second tool should preferably be pressed against each other with a force that generates an overpressure of no more than 1 MPa and preferably no more than 900 KPa. In fact, it can be suitable in some cases to use a very low pressure and the pressure may be in the range of 10 - 900 KPa. It is also conceivable that no mechanical pressure at all is applied.
  • Suction should preferably be applied to the first tool also when the fibre product is sandwiched between the first tool and the heated second tool.
  • the second tool is permeable to air and water. Suction is then applied also to the second tool when the fibre product is sandwiched between the tools so that steam and water is evacuated through both the first tool and the second tool.
  • the invention also relates to a machine for producing fibre products from stock.
  • the machine comprises a moulding tank for holding stock and a first tool that is permeable to air and water.
  • the machine further comprises a second tool that is permeable to air and water.
  • the machine has means connected to the first tool for lowering the first tool into the tank and lifting the first tool out of the tank and for bringing the first tool against the second tool.
  • a suction device i.e. a source of underpressure is connected to the first tool.
  • a source of heat i.e.
  • the machine further comprises a microwave heater for additional removal of water from a fibre product that has previously been dewatered between the first and the second tool. There are also means for transferring a fibre product from the second tool to the microwave heater.
  • a machine vat is arranged to supply stock to the moulding tank through a conduit.
  • a by-pass conduit that can be used selectively such that stock from the machine vat can be either passed directly to the moulding tank or pumped around in a looped flow.
  • a steam shower can be arranged before the microwave heater so that a fibre product to be passed through the microwave heater can be showered with steam before it is treated by the microwave heater.
  • the first tool comprises particles that have been sintered together to form a porous body.
  • the second tool comprises particles that have been sintered together to form a porous body.
  • other tools than sintered tools could be considered.
  • the first and second tools are mounted on holders that can be rotated between different angular positions.
  • additional tools may be arranged in a path from the pair of the first and second tool to the microwave heater, the additional tools forming cooperating pairs of tools where a fibre product may be subjected to additional dewatering and the additional tools further being arranged to convey a fibre product towards the microwave heater.
  • Fig. 1 a machine for producing fibre products is shown.
  • a stock preparation section is indicated where pulp bales 20 can be disintegrated and dissolved into stock in a pulper 22 and subsequently passed to a machine vat 7.
  • the stock can be kept in motion by an agitating device 21 to avoid flocculation.
  • the stock can be fed through a conduit 8 to a tank 6 which is used in the process according to the present invention. In the invention, no stock is fed to the moulding tank 6 during the actual forming step.
  • the fibre product After a fibre product has been formed on a tool 1 that is immersed in the stock that is kept in the tank 6, the fibre product is dewatered between opposing pairs of tools and subsequently passed to a microwave heating device 17 for final drying.
  • a conveyor belt 15 can be used to transport fibre products 10 to the microwave heater 17.
  • pick-up unit 23 At the end of the production line, there may be a pick-up unit 23 that is used to place the final products 10 in a stack 24.
  • the pick-up unit 23 may have a suction device (not shown) in order to be able to pick up the ready-dried products 10.
  • a first tool 1 is placed on a holder 14 which can pivot on an axle or pin 14.
  • the holder 13 has been pivoted or rotated to a position where the first tool 1 faces the stock 19 that is held in a tank 6.
  • the first tool 1 is mounted on the holder 13 in such a way that is can be lowered into the stock 19. This can be done by special means for lowering and raising the first tool 1 in relation to the holder 13.
  • Such means can include a telescoping hydraulically operated arm 18 which is indicated schematically in for example Fig. 2c .
  • the first tool 1 is now lowered into the stock 19 until it reaches the position indicated in Fig. 2d .
  • This position is showed in greater detail in Fig. 3 .
  • the first tool 1 has a profiled surface 25 that corresponds to the shape of a fibre product to be formed.
  • the first tool 1 is air and water permeable. It is also connected to a source of underpressure, i.e. a suction device 2 that can apply suction through the first tool 1 such that water and fibres are sucked towards the first tool 1.
  • the water will pass through the first tool 1 and can be passed back into the stock 19 through a return conduit (not shown).
  • the fibres will stay on the profiled surface 25 of the first tool 1 and form an embryonic fibre product 10 as indicated in Fig. 4 .
  • the first tool 1 serves as a forming tool for initial forming of the fibre products.
  • the stock used is preferably based on be chemithermomechanical pulp (CTMP) but also other pulp that CTMP can be contemplated.
  • CTMP is a preferred pulp in this context since it is relatively easy to dewater stock based on CTMP.
  • the consistency of the stock may be 0,5 % by weight or about 0,5 % by weight. However, other values for consistency may also be contemplated.
  • the initial forming step may take about 1- 2 seconds.
  • the first tool 1 (the forming tool) is lifted from the stock 19 as indicated in Fig. 2e .
  • the formed fibre product 10 now has a dry solids content of about 20% but dry solids content can also be somewhat lower or somewhat higher, realistically in the range of, for example, 18 - 22 %.
  • the holder 13 may then be rotated and the first tool 1 once again moved by the arm 18 away from the body of the holder 13.
  • the first tool 1 is moved horizontally and to the right in the figures.
  • other directions and patterns of movement are also possible.
  • the first tool is moved in order to mate with a second tool 3 as indicated symbolically in Fig. 2h and in greater detail in Fig. 5 .
  • the suction device 2 continues to be active so that the embryonic fibre product 10 is firmly held by the first tool 1.
  • the second tool 3 has a profiled surface 26 that matches the profiled surface 25 of the first tool 1.
  • the formed fibre product 10 is held between the tools 1,3.
  • the first tool 1 is shown as a male tool while the second tool 3 is shown as a female tool. This is believed to the most suitable solution since it makes the forming process easier but the first tool 1 can also be a female tool.
  • a heating device 5 is arranged to heat the second tool 3 such that the profiled surface 26 of the second tool 3 reaches a temperature of preferably at least 220°C. Also temperatures considerably higher than 220°C can be used. A realistic interval for the surface temperature of the second tool 3 may be 220°C - 400°C. Although the surface temperature for the second tool 3 should preferably be at least 220°C in order to achieve effective dewatering, it should be understood that temperatures below 220°C can be contemplated. For example, the temperature could be as low as 200°C. Hence, an interval for the temperature can be 200°C - 400°C.
  • the second tool 3 is also a permeable tool and a suction device 4 may also be connected to the second tool 3 to apply suction through the second tool 3 when the second tool 3 mates with the first tool 1. Due to the high temperature of the second tool 3, water in the fibre product 10 is vaporized. Since at least the first tool 1 is permeable, vapour can escape through the first tool 1. If the suction device 2 of the first tool is active, this will facilitate evacuation of vapour. If the second tool 3 is also permeable, vapour can also be evacuated through the second tool 3 and this is made more efficient if the suction device 4 of the second tool is active. The fibre product 10 is held between the tools 1, 3 during the vaporization.
  • the time in the nip between the tools 1, 3 should preferably be quite short and a time of no more than 1 second can be suitable. In some cases, a time which is less than 1 second can be suitable.
  • the pressure in the nip between the tools 1, 3 should preferably not be higher than 1 MPa.
  • the mechanical pressure should not be higher than 900 KPa.
  • the mechanical pressure may be in the range of 10 - 900 MPa. In some cases, the pressure could actually be zero.
  • each tool holder 13 is pivotable and has an axle 14 for this purpose.
  • the axle 14 may be rotatable together with the tool holder or the tool holder 13 may pivot on the axle 14.
  • Each of the tools 11, 12 can form a nip together with at least one other tool on an adjacent tool holder 13.
  • Each of the tools 11, 12 may be permeable and connected to a suction device just like the first tool 1 and the second tool 3.
  • the tools 11, 12 can be mounted on one or several telescoping arms 18 or on some other actuator to move the tools 11, 12 away from or towards their respective holders 13. In this way, a tool 11 on one holder 13 may be moved horizontally towards a tool 12 on an adjacent holder 13 in order to dewater a fibre product held between the tools 11, 12.
  • the tools 11, 12 and there tool holders 13 also serve as a conveyor for conveying the fibre product 10 towards the microwave heater 17. This functions in the following way.
  • a fibre product 10 is held on a male tool 1, 11 or on a female tool 3, 12 by means of suction through the permeable tool 1, 3, 11, 12.
  • the fibre product 10 is initially held on a male tool 1, 11.
  • the arm 18 moves the male tool 1,11 towards the female tool 3, 12.
  • the fibre product 10 is dewatered.
  • the suction through the male tool 1, 11 is released and the fibre product 10 is now held by suction through the female tool 3, 12.
  • the male tool 1, 11 returns to its original position.
  • the tool holder 13 of the female tool 3, 12 is now rotated 180° such that the fibre product will be facing a new male tool 12. It can now be understood that this process can be repeated in such a way that the fibre product 10 is transferred to the next male tool and further towards the microwave dryer.
  • the tools 11, 12 and their holders 13 are thus arranged to convey a fibre product 10 towards the microwave heater.
  • Fig. 7 For additional clarification of the arrangement of the additional tools 11, 12, reference is also made to Fig. 7 .
  • each tool holder 13 can have a plurality of tools 12 arranged next to each other so that a plurality of fibre products 10 can be produced and finished simultaneously.
  • each of the additional pairs of tools 11, 12 can function in the same way as the first tool 1 (the forming tool) and the second tool 3 and that further dewatering can take place in the nips formed between the pairs of additional tools 11, 12.
  • the additional tools 11, 12 this serve both the purpose of dewatering and the purpose of conveying the fibre product(s) 10.
  • the pressure between the first tool 1 and the second tool 3 may be kept relatively low while a higher pressure and a lower temperature is used between following tool pairs 11, 12.
  • the higher pressure of up to 1 MPa can be used in a press nip between the last pair of tools 11, 12. It should be understood that, normally, additional dewatering takes place in press nips between the additional tools 11, 12.
  • the pressure in the nips could increase from nip to nip such that the lowest pressure is used in the first nip, a higher pressure is used in following nips and the highest pressure in the last nip. The pressure may thus increase in steps from nip to nip.
  • a conveyor belt 15 may be located at the end of the tool path.
  • Fig. 9a shows how the last tool holder 13 is in a horizontal position. It should be understood that a fibre product 10 is held by suction to the male tool 11. The tool holder 13 is located above the conveyor belt 15.
  • Fig. 9b the tool holder 13 has been rotated so that the tool 11 now faces the conveyor belt 15. The tool 11 moves downwards as indicated in Fig. 9c and the suction is deactivated causing the fibre product to be dropped on the conveyor belt 15. Possibly, air could also be blown through the tool 11 to help the fibre product 10 to leave the tool 11. The fibre product will then be transported towards the microwave heater while the tool 11 returns to its original position as indicated in Fig 9e - 9h .
  • Fig. 10 it can be seen how the microwave heater 17 can be preceded by a steam shower 16 that blows steam on the fibre product 10.
  • the purpose of this is to achieve a more even moisture distribution in the fibre product 10.
  • steam is an optional feature of the invention and it is possible to envisage embodiments of the invention where steam is not used.
  • the fibre product has been dewatered to a dry solids content of at least 70% before it reaches the microwave heater 17.
  • Fig. 11 is an exploded view of the first tool 1 and the second tool 3.
  • a heater 5 may be placed close to the second tool 3, possibly directly connected to the tool 3 or at a certain distance from the second tool 3.
  • both tools 1, 3 are provided with channels 27 through which water and air can pass.
  • the tools 1, 3 may comprise different layers 28, 29, 30. These layers are parts of the tool structure that have different permeability.
  • An inner layer 28 forms a base structure with a relatively high degree of permeability.
  • An intermediate layer 29 has a relatively lower permeability and a thin surface layer 30 may have an even lower permeability.
  • the tools may advantageously be made of small metal spheres that have been sintered together to form the different layers.
  • the surface layer 30 may be formed of small spheres 31 while the intermediate layer 29 may be formed by somewhat larger metal spheres 32.
  • the base structure 28 is formed by the largest spheres 33.
  • the smallest particles 31 may have a diameter in the range of 0,01mm - 0,18 mm while the particles 32 in the intermediate layer 29 may have a diameter in the range of 0,18mm - 0,25 mm.
  • the larger particles or spheres 33 in the base layer may have a diameter of 0,71mm - 1 mm.
  • the particles 31, 32, 33 may be the kind of particles that are sold in the form of metal powder and can be obtained from CALLO AB, Poppelgatan 15, 571 39 Nässjö, Sweden.
  • CALLO AB sells a metal powder under the name Callo 25 which is a spherical metal powder with particles having a diameter of 0,09 - 0,18mm.
  • the chemical composition is 89% Cu and 11% Sn. Suitable particles can also be obtained from Makin Metal Powders Limited, Buckley Road, Rochdale, Lancashire OL12 9DT England.
  • the porosity of the tool 1 may be about 40%.
  • the value of 40% porosity can apply to all layers. Embodiments of the invention can also be envisaged where different layers of the tool have different porosity.
  • the smaller spheres 31 form a fine surface layer that contributes to giving the fibre product a smooth surface while the interior layers 29, 28 improve permeability.
  • the channels 27 that pass through the sintered structure may have pointed tips that reach the surface of the tool which improves permeability.
  • a part 34 of the surface 25 of the first tool 1 has been covered or coated so as to be impermeable or substantially impermeable.
  • the impermeable spot 34 no layer of fibres will form.
  • the fibre product will have a hole with a shape corresponding to the impermeable spot 34.
  • the impermeable spot 34 can be achieved by for example painting a part of the surface 25 or by covering a part of the surface 25 with a sheet of an impermeable material. It should be understood that this feature (an impermeable spot) is entirely optional and that the invention can be practiced without this optional feature.
  • the invention can be understood as including the (optional) step of using a tool with an impermeable spot 34.
  • the idea of using a tool with an impermeable spot can be used independently of how the tool, the machine or the method is otherwise designed or performed.
  • the porous structure provided by the sintered metal particles 31, 32, 33 has the advantage that water and vapour can escape easily through the tools 1, 3,11, 12. This reduces the risk of delamination during the vaporization process.
  • the sintered structure also has the advantage that steam can escape in a very even way over the whole surface of the tool.
  • the high temperature entails the advantage that an efficient dewatering is achieved. Pressing with a relatively high pressure before the microwave heater (when the fibre product is wet) entails the advantage that good surface properties can be achieved before microwave drying. Therefore, it will not be necessary to press the fibre product after microwave drying which could be harmful to the fibre product.
  • the microwave heating step entails the advantage of improved hygiene.
  • the use of the high temperature also entails the advantage that the surface of the fibre product becomes more compact which is advantageous in view of bending stiffness.
  • the microwave heating can be deleted or replaced by some other heating method, for example IR heating.
  • the invention also relates to a fibre product that can be obtained by the above described method.
  • Figs. 15A-15C there are shown properties of a moulded product produced in accordance with the invention.
  • Fig. 15A demonstrates that quality aspects (being of importance in many fields where moulded fibre pulp products are used, e.g. the packaging industry) can be remarkably better for the invention in relation to prior art products, e.g. produced by thermo moulding or conventional pulp moulding. It is believed that one reason for the high quality of a product according to the invention is that a high density can be achieved, in the range of 600 - 900 kg/m 3 , without causing any weakness in the fibre net work.
  • thermo formed pulp products may obtain a level above 500 kg/ m 3 .
  • thermo forming which includes hot after pressing
  • the fibre net work will be partly disrupted that drastically decreases some quality aspects, e.g. tensile index.
  • corners and other areas of the body that presents sharp bends/curves will be negatively affected by such hot after pressing, whereas according to the invention corners and areas having a sharp radius also present substantially the same kind of continuous, homogenous web structure as substantially flat areas of the body, which in turn provides equally good quality aspects in substantially all parts of the product.
  • the fibre web of the product is of even thickness or substantially even thickness.
  • fibre products obtained by the method described may, at least in certain cases, have a density lower than 600 kg/m 3 or higher than 900 kg/m 3 .
  • a further major advantage according to the invention is that very smooth surfaces on both sides of the body may be produced.
  • Products produced according to the invention may easily obtain a roughness in the range of about 750 -1.000 ml/min. (ISO 8791-2, Bendtsen), whereas conventional moulded pulp products at least on one side normally have a roughness well above 1.500 ml/min. It may be mentioned that one of the reasons why conventional products normally present a higher roughness is that most conventional techniques do use a wire mesh to form the surface.
  • a further advantage according to the invention is that the product will achieve a high tensile index, normally in the range of 65-100 kNm/kg., which indeed is a significant advantage compared to traditional moulded pulp products. (see Fig 15 B) Moreover also a good tear index is achieved.
  • Another advantage is that the bonding strength of the surface layer will be somehow higher than the bonding strength of an intermediate layer near the centre portion of the web forming the body, since the inventive method will achieve a higher amount of bindings between the fibres in the surface layer. As a consequence there is achieved a similar function as with an I-beam, i.e. the stiffness and the bending resistance is improved.
  • a product according to the invention may be achieved without any after pressing which otherwise will increased production costs and as has been mentioned above also negatively effect the at least some or one quality aspect/s.
  • Fig. 15B it is shown that thanks to all of the advantages mentioned above the tensile index for a product produced according to the invention may have high values independent on the shape of the body, whereas according to conventional methods the products will present decreasing tensile index with increasing complexity of the shape of the body.
  • table 15C there are presented some empirically found average values for two prior art methods, i.e. conventional pulp moulding and thermo forming, in comparison with the invention. As is evident from this table, products according to the invention may have numerous advantages in relation to quality aspects compared with prior art products.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Nonwoven Fabrics (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Wrappers (AREA)
  • Preliminary Treatment Of Fibers (AREA)
EP05813364A 2004-11-26 2005-11-25 A method and a machine for making fibre products from stock Not-in-force EP1815066B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05813364T PL1815066T3 (pl) 2004-11-26 2005-11-25 Sposób i maszyna do wytwarzania produktów włóknistych z zapasu masy

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0402900A SE528685C2 (sv) 2004-11-26 2004-11-26 Metod och maskin för att tillverka fiberprodukter av mäld
PCT/SE2005/001772 WO2006057610A2 (en) 2004-11-26 2005-11-25 A method and a machine for making fibre products from stock and a new type of fibre product

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US11905101B2 (en) 2018-07-19 2024-02-20 Celwise Ab Method of making double-walled structure, and structure formed by the method

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SE544857C2 (en) * 2018-07-19 2022-12-13 Celwise Ab Sealed package and method of making such a sealed package
US20230392322A1 (en) * 2018-07-19 2023-12-07 Celwise Ab Method of producing a pulp product
US11905101B2 (en) 2018-07-19 2024-02-20 Celwise Ab Method of making double-walled structure, and structure formed by the method

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ATE526458T1 (de) 2011-10-15
CN101111640A (zh) 2008-01-23
RU2384664C2 (ru) 2010-03-20
CA2589465C (en) 2013-06-25
CN101111640B (zh) 2013-06-26
PL1815066T3 (pl) 2012-02-29
CA2589465A1 (en) 2006-06-01
JP4854672B2 (ja) 2012-01-18
AU2005310066B2 (en) 2011-11-10
EP1815066A2 (en) 2007-08-08
AU2005310066A1 (en) 2006-06-01
ZA200704907B (en) 2008-09-25
KR20070104536A (ko) 2007-10-26
RU2007119429A (ru) 2009-01-10
SE528685C2 (sv) 2007-01-23
SE0402900D0 (sv) 2004-11-26
ES2374710T3 (es) 2012-02-21
SE0402900L (sv) 2006-05-27
US20090142523A1 (en) 2009-06-04
BRPI0518028B1 (pt) 2017-03-07
KR101295024B1 (ko) 2013-08-09
BRPI0518028A (pt) 2008-11-04
JP2008522045A (ja) 2008-06-26
CN2832893Y (zh) 2006-11-01
WO2006057610A2 (en) 2006-06-01
WO2006057610A3 (en) 2006-11-02

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