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WO2024046984A1 - Procédé de fabrication d'un produit à base de fibres à partir de pâte de bois - Google Patents

Procédé de fabrication d'un produit à base de fibres à partir de pâte de bois Download PDF

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Publication number
WO2024046984A1
WO2024046984A1 PCT/EP2023/073535 EP2023073535W WO2024046984A1 WO 2024046984 A1 WO2024046984 A1 WO 2024046984A1 EP 2023073535 W EP2023073535 W EP 2023073535W WO 2024046984 A1 WO2024046984 A1 WO 2024046984A1
Authority
WO
WIPO (PCT)
Prior art keywords
blank
fiber
mold
pulp
dried
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.)
Ceased
Application number
PCT/EP2023/073535
Other languages
German (de)
English (en)
Inventor
Florian MÜLLER
Christian Preiss
Simon SEPPI
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.)
Alpla Werke Alwin Lehner GmbH and Co KG
Original Assignee
Alpla Werke Alwin Lehner GmbH and Co KG
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 Alpla Werke Alwin Lehner GmbH and Co KG filed Critical Alpla Werke Alwin Lehner GmbH and Co KG
Priority to CN202380062245.4A priority Critical patent/CN119790201A/zh
Priority to EP23764587.4A priority patent/EP4581208A1/fr
Publication of WO2024046984A1 publication Critical patent/WO2024046984A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • D21J3/10—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds of hollow bodies
    • 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

Definitions

  • the present invention relates to a method for producing a fiber-based product from pulp, in particular a container or a fiber-based closure element for a container, according to the preamble of the independent claim.
  • a fiber-based container was proposed in WO 2012/139590 Al.
  • so-called pulp is introduced into a mold arranged upside down by injection and pressed into this mold with a flexible balloon against a corresponding wall and compressed accordingly.
  • the pulp is compressed and heated to a temperature of around 180 ° C to dry the container.
  • Pulp is a mixture of fibers and water, especially natural fibers such as hemp fibers, cellulose fibers or flax fibers or a mixture thereof. If necessary, the pulp has additives which, for example, improve hardening of the compressed pulp or have an influence on the later appearance or generally change the properties of the pulp or the later container.
  • the injection process is also very difficult to control.
  • the type and amount of pulp deposition within the mold is largely left to chance. This is reflected in different properties of the finished container, for example in different wall thicknesses and thus in different strengths or in different surfaces, in particular also in different dimensions of the same elements of different containers.
  • the containers are formed in a negative mold, a very high degree of dimensional accuracy can be achieved in relation to their outer contour.
  • the inner contour or the inner surface of the container is subject to deviations of varying degrees, depending on the specific properties of the pulp from which the container is formed.
  • a method is to be provided that makes it possible to produce fiber-based containers with precise dimensions, in particular as independently as possible of material deviations of the container. It should preferably be possible to dispense with post-processing of the container.
  • a method according to the invention for producing a fiber-based product from pulp, in particular a container or a fiber-based closure element for a container comprises the following steps: - Providing a casting mold,
  • the product is preferably a container for liquids, in particular a beverage bottle.
  • the pulp can be introduced into the mold using the following steps:
  • the liquid supply provides a standing column that is essentially free of turbulence and/or turbulence.
  • the liquid supply is also made of water.
  • the pulp is also an essential water based mixture. So if the pulp is used on top of the liquid supply, these two media do not mix.
  • the liquid supply is practically replenished by the pulp.
  • the liquid supply therefore provides a standing column of water, which is merely lengthened by the application of pulp to this column of water.
  • a mold for producing a fiber-based blank is typically liquid-permeable and has two mold halves that can be separated from one another. These two mold halves provide a cavity into which the pulp is introduced.
  • the casting mold can be formed, for example, from a metal grid which has an outer boundary that is impermeable to liquid, so that a liquid supply can be provided within this casting mold.
  • the external boundary can be provided, for example, by a container, which container can be flooded.
  • the cavity essentially corresponds to a negative impression of the blank to be produced and, like the blank, has a mouth opening.
  • the pulp is introduced accordingly via the mouth opening.
  • the mouth opening is the pouring opening on the neck of the bottle.
  • the blank can also take the shape of an open-topped container without a specific mouth, for example a bowl, a cup or a tray. These are provided with an opening that usually faces upwards when used as intended. Accordingly, the pulp is introduced via the opening cross section of the corresponding opening.
  • the casting mold in such wide-necked containers, such as a cup is closed with a lid in the area of the opening and a separate mouth is provided here in order to introduce the pulp into the casting mold.
  • the liquid supply can be replaced by selectively draining the liquid supply through the casting mold. By draining the liquid supply, the pulp flows into the casting mold.
  • the draining process can be controlled by an excess pressure that is applied to the pulp. Additionally or alternatively, provision can be made to remove the liquid supply in the casting mold using a vacuum so that the pulp is sucked into the casting mold.
  • the draining of the liquid supply can also be controlled, for example, by a diaphragm, so that the draining speed is limited or can be regulated by limiting the drain volume.
  • pulps can be introduced into the casting mold one after the other.
  • pulps can be used that differ in color or based on their properties, in particular their fiber properties or their functional properties, such as barrier properties. It can be provided that the liquid supply is drained from the casting mold at several points. These points can correspond to different segments or areas of the later blank and thus also to the casting mold.
  • the flow of the pulp within the mold can be directed so that the settling of the pulp can also be controlled and controlled. This allows the wall of the blank to be built up in a targeted manner and the quantity and location of the deposited or deposited pulp can be controlled in a targeted manner.
  • the settling of the pulp refers to the settling of the fibers in the pulp, in this case on the inner wall of the mold in the cavity.
  • liquid supply is drained from the casting mold through the several points in a specific time sequence.
  • the structure of the blank wall can be specifically controlled and a fiber distribution within the blank wall can be produced that meets specific requirements.
  • a thicker structure can be achieved than in the rest of the blank.
  • blanks can be created for containers that are optimized in terms of weight or stackability (top load) or the orientation of the fibers and much more.
  • top load weight or stackability
  • the wall thickness of the blank, and therefore of the container, typically always corresponds to the wall thickness is needed to absorb the highest force, since targeted control of the settling process of the fibers is not possible in the usual methods used.
  • a corresponding casting mold has several drain openings that are opened in a specific time sequence.
  • the term “draining” refers here to the discharge of liquid from the casting mold.
  • the pulp is preferably introduced into the casting mold with an excess pressure, in particular an excess pressure is generated after the pulp has been applied to the liquid supply, i.e. during the draining of the liquid supply.
  • the pressure can be built up in particular before the liquid supply is drained.
  • the mold Before introducing the pulp, the mold can be backwashed by filling it with process fluid.
  • the process liquid can be discharged through a mouth opening of the casting mold that corresponds to the opening of the blank. This allows the casting mold to be easily backwashed, with the backwash liquid and the process liquid preferably being identical.
  • the casting mold is already filled with a liquid supply as described here and the pulp can be immediately applied to the liquid supply.
  • the wet fiber-based blank can remain within the mold during the drying process, that is, during exposure to microwaves.
  • the container is therefore protected against external influences and damage or deformation is prevented.
  • the wet fiber-based blank within the microwave-permeable press mold, it can also be achieved that it is accessible to the microwaves from all sides and drying can therefore be accomplished from all sides. After this drying step, the wet fiber-based blank has a water content of approximately 5% to 12%.
  • the wet fiber-based blanks are typically formed as described herein.
  • pulp is placed in a porous mold or in a solid mold with water-draining channels, the entrances of which are covered with sieves or whose openings are small enough that the fibers of the pulp cannot penetrate, and on the inner wall of the mold form the fibers of the pulp washed up so that a wall of a container builds up.
  • the now present semi-finished product i.e. the wet fiber-based blank, is removed from the casting mold and placed into the microwave-permeable press mold and thus made available in the press mold.
  • the wet fiber-based blank has a water content of approximately 75% or less, so that it can be transported between the processing stations in a dimensionally stable manner.
  • the wet fiber-based blank is removed from the casting mold using a suitable transfer device.
  • the wet fiber-based blank is then placed into the opened press mold.
  • the press mold is preferably designed in two parts. Blowing out and/or suction using negative or positive pressure may be necessary for removal and insertion. Purely mechanical grippers can also be used for this transfer.
  • the press mold can have an inner wall which is designed with a greater surface quality compared to the inner wall of the casting mold.
  • an expandable tool is introduced into the fiber-based blank.
  • the water content of the fiber-based blank can be reduced in a first step by compressing a wall of the blank.
  • the wet fiber-based blank has a water content of approximately 50% - 60% at this point.
  • the press mold can be designed with a higher quality compared to the casting mold. It can be provided that the expandable tool remains in the expanded state during exposure to microwaves. In other words, the expansion of the expandable tool and the exposure of the pressed blank to microwaves occur simultaneously. The blank remains in the press mold.
  • the fiber-based blank can be introduced into a microwave-reflecting microwave chamber before being exposed to microwaves, in particular together with the press mold.
  • microwaves can thereby be increased.
  • Microwaves that are not directly absorbed by the wet fiber-based blank are typically reflected on the inner wall of the microwave chamber, increasing the likelihood that these microwaves will still hit the blank being dried.
  • Water for example, has a natural frequency of 2. 45GHz.
  • the microwaves are therefore preferably generated at this frequency.
  • the water is preferably heated until it evaporates and is accordingly diffused from the wet blank.
  • the press mold and/or the microwave chamber are placed on one Temperature is preheated which is higher than 60 ° C but preferably lower than 160 ° C.
  • the heating can be carried out, for example, via conventional resistance heating tongues. Additionally or alternatively, it is conceivable to blow in a correspondingly heated fluid, for example air, so that the respective elements reach the desired temperature.
  • a correspondingly heated fluid for example air
  • preheating the press mold could, for example, also occur through intentional, partial absorption of the microwave radiation in the press mold itself in the order of a maximum of 10%, preferably a maximum of 5% of the microwave radiation, or through the energy release of the Drying of generated steam to the press mold.
  • the moisture can be water vapor but also water in its liquid form.
  • the moisture within the device can be kept low and condensation of the moisture or renewed heating of the moisture, for example water drops caused by microwave radiation, can be prevented.
  • the blanks can each be rotated around their own axis and/or around a common axis. This enables the microwaves to be used more efficiently and enables a more even energy input into the blanks.
  • stirrer in particular within the microwave chamber or at the transition of a waveguide to the microwave chamber, and to use this to swirl the microwaves.
  • a stirrer can be used to disrupt the static propagation of microwaves within the drying chamber, i.e. the microwave chamber, and to minimize areas of high microwave intensity. Such an arrangement also has a positive effect in terms of uniform energy input.
  • Another way to improve quality is to apply the microwaves in a cycled manner depending on the water content of the wet fiber-based blank.
  • the performance can be reduced by the clocking.
  • the water content in the wet fiber-based blank is lower and too much energy can cause the blank to overheat in certain areas. This can be prevented by reducing the power.
  • the microwave-permeable mold can be made of a material selected from the list of materials including PEI, PI, PE, POM, PEEK, wood, PTFE, ceramic, glass and PP.
  • the press mold can be porous or solid with water-draining channels or made of a fine-mesh material.
  • the excess supernatant is separated off with a laser beam.
  • Moving the laser beam relative to the dried blank allows the laser beam to remain constant Distance to move in relation to the surface of the supernatant to be separated and also to maintain a specific angle of the laser beam in relation to the surface.
  • this configuration allows an angle of the cutting edge along the surface to be kept the same over the entire course of the cutting edge. This also leads to a very flat cutting edge. Waviness of the cut edge can be prevented.
  • the relative movement is preferably a rotational movement of the container in relation to the laser beam, rather than a movement of the laser beam in the circumferential direction of the blank.
  • a cutting device for assembling the dried blank has a holding device for holding the dried blank. It also has a cutting laser for generating a laser beam, the laser beam of the cutting laser and the dried blank being movable relative to one another by means of the laser beam in order to separate excess excess of the dried blank.
  • the laser beam is guided in a deflection device and this deflection device is rotated about a longitudinal axis of the dried blank in order to separate the excess excess material in order to generate the relative movement.
  • Such a process step can provide a simple process sequence that can be precisely adjusted and reproducible.
  • the laser beam can be focused on a surface of the excess supernatant to be separated using focusing optics, or the focus of the laser beam can be set to a specific distance from the surface. This can be zero or negative, so that the focal point lies within the material thickness. A clean cut can be made possible through such focusing optics and corresponding focusing.
  • the laser beam can be positioned and activated in the direction of the longitudinal axis above a final cut surface.
  • the laser cut has a vertical movement component up to a cutting position of the final cut surface.
  • a movement component directed in the circumferential direction of the fiber-based product is also superimposed on this vertical movement component, so that a substantially grinding cut is created.
  • the laser beam is moved in the direction of the longitudinal axis over the final cut surface before deactivating the laser beam.
  • the laser cut has a vertical movement component up to the final position in which the laser beam is deactivated.
  • the vertical movement component allows the burn mark to be kept away from the final cut surface.
  • the vertical movement component preferably has a superimposed movement component directed in the circumferential direction of the dried blank. A grinding cut is also created here.
  • Both turning on and turning off the laser beam can be done while the laser is moving downwards or downwards. moved upwards and the dried blank and the laser beam additionally already have the movement component directed in the circumferential direction of the dried blank. This also reduces the risk or at least the size of a localized burn.
  • a radial distance of a focusing optics from the longitudinal axis is initially set according to a product-specific parameter. This ensures that a focal point of the laser beam is always at the desired distance from the surface of the supernatant to be separated and thus creates a cut surface with a correspondingly high quality.
  • the product-specific parameter can be determined individually for each fiber-based product/dried blank. It is conceivable that each product is measured before the cutting process and the corresponding data is transferred to the cutting device and this carries out the cut accordingly with a static setting.
  • This parameter can also be set for entire batches, for example if they are manufactured within a narrow tolerance range.
  • a pre-written profile can be transferred to the cutting device, so that a radial adjustment of the focusing optics can be adjusted continuously and in accordance with the profile over the course of the cut.
  • the radial distance is continuously adapted to a contour of the dried blank during the separation process or the cutting process.
  • flushing gas can be blown into the dried blank using a flushing device during the cutting process.
  • purge gas By blowing in purge gas in this way, dirt and particles that arise during the cutting process can be blown out of the interior of the blank or are prevented from depositing in the interior of the dried blank.
  • exhaust air is sucked out of the dried blank, in particular from the interior of the dried blank, with a second suction device and/or from the area of an outlet nozzle with a first suction device.
  • the deflection device is supplied with flushing gas during the separation process.
  • a protective gas flow can in particular prevent dirt or dust particles from entering the laser beam.
  • the separated excess supernatant can be stripped off from the cutting device by means of a scraper ring.
  • the excess supernatant can thus be disposed of in a targeted manner, for example conveyed in the direction of a separately arranged funnel or container.
  • a powder coating can be applied to the assembled opening of the dried blank. Applying a powder coating makes it possible to seal the cutting edge.
  • a powder coating can also be applied to the inside of the dried blank after assembly. This allows the interior of the blank to be sealed and/or sealed.
  • a powder coating is applied to an outside of a neck area of the dried blank after assembly. However, at least part of the outside of the dried blank remains uncoated, so the outside is partially uncoated.
  • the outside of the neck area By coating the outside of the neck area, it can also be sealed and/or more durable during use.
  • the uncoated area on the outside of the blank allows the product to be recycled.
  • the uncoated area provides an attack surface on which the product can be broken up or softened using water. This makes it easier for the product to be recycled.
  • a meltable polymer can be applied as a powder coating.
  • Polymers have advantageous properties and are easy to process.
  • the powder coating it can be electrostatically charged.
  • a conductive mold which encases the press mold, is charged in the opposite polarity with respect to the powder. The powder then settles particularly on the inside of the blank and sticks there.
  • the powder coating can then be melted in an oven under the influence of heat to create a coherent film.
  • the applied powder coating is therefore subjected to thermal energy and the powder is transferred into a melt. Melting creates a homogeneous film that provides an appropriate seal. This film preferably extends from the inside over the finished opening to an outer area of the neck and forms a continuous seal in this area.
  • the dried blank is tested for leaks. This can prevent defective products from being sold.
  • a product can be poured into the dried blank and the dried blank can then be closed with a closure. Accordingly, a closed body is created for transport and protection of liquid products.
  • a reliable seal can be created in this area with a corresponding sealing cone or sealing plane, for example made of a sealing material such as a liner.
  • Figure 1 A casting mold
  • FIGS. 2A to 2E individual process steps
  • FIG. 3 A device before exposure to microwaves
  • Figure 4 the device according to Figure 3 during exposure to microwaves
  • Figure 5 A perspective view of a
  • Figure 6 a sectional view through the cutting device according to Figure 5;
  • Figure 7 a detailed view from Figure 6;
  • Figure 8 a perspective view of a dried blank
  • Figure 9 a powder coating process
  • Figure 10 the drying step of the powder coating process
  • Figure 11 a leak test
  • Figure 12 the closing process
  • Figure 13 exemplary further typical products that can be produced using the method according to the invention
  • Figure 14 an example of a typical fiber-based
  • Figure 1 shows a casting mold 70 for a blank for a container in the shape of a bottle.
  • the casting mold 70 in the present case has two casting mold halves, although only one half is shown in FIG.
  • a cavity 72 is arranged within the casting mold 70 and is surrounded by a liquid-impermeable outer boundary 73.
  • the cavity 72 is water-permeable and, in the present case, formed from a metal grid or sieve.
  • the liquid-impermeable outer boundary 73 has a cavity 74 in which the cavity 72 is arranged.
  • the casting mold 70 has several drain openings 71.
  • the drain openings 71 connect an exterior of the mold 70 to the cavity 74.
  • the casting mold 70 also has an inlet opening 75 which opens directly into the interior of the cavity 72.
  • the drain openings 71 are arranged at different heights and can thus define different drain levels.
  • the position designation height is defined here based on the representation shown in Figure 1 and thus on the container in its intended position, i.e. in an upright form with a dispensing opening at the top and a container base at the bottom on which the container stands.
  • valves are arranged to close the respective openings.
  • the inlet opening 75 can, as shown here, be provided with a branch 76, which can also be closed.
  • FIGS. 2A to 2E show a simplified cross section through the casting mold 70 according to Figure 1.
  • the casting mold 70 is filled with a process liquid 95, so that a liquid reservoir 96 is formed within the casting mold 70.
  • the casting mold 70 is closed here, that is, the drain openings 71 are closed.
  • the liquid supply 96 completely fills the cavity 74 and also flows through the cavity
  • the casting mold 70 is connected with its inlet opening 75 to a corresponding reservoir or process tank in which pulp 90 is located.
  • the pulp 90 has already been applied to the liquid supply 96 in the casting mold 70.
  • the branch 76 at the inlet opening is closed.
  • the now open drain openings 71 can be closed and other drain openings 71 can be opened. This can be seen, for example, from the illustration in FIG. 2C.
  • the drain openings 71 located further down in relation to the open drain openings 71 according to FIG. 2B are opened.
  • the process liquid 95 now flows out of the mold in the direction of the arrows P2 and the pulp 90 settles at further points within the cavity 72. Wall 101 continues to be built up.
  • the drain opening 71 located furthest down can be opened. This is shown in Figure 2D.
  • the process liquid 95 still remaining in the casting mold 70 is now completely displaced by the pulp 90 and flows in the direction of arrow P3.
  • the construction of the wall 101 of the blank 60 is now finished.
  • a valve at the inlet opening 75 is then closed so that no further pulp can flow in.
  • the liquid still remaining in the casting mold 70 is drained off completely and the resulting blank 60 is removed from the mold.
  • the casting mold 70 is now empty, although fiber residues from the pulp 90 can still adhere to the cavity 72. These fiber residues can be backwashed.
  • Process liquid 95 is introduced into the mold 70 through the drain openings 71. This is shown in Figure 2E by the arrows P4. As the process liquid flows in, fiber residues are detached from the cavity 72 and discharged through the branch 76, which is shown by the arrow P5.
  • the inlet opening 75 is closed and the branch 76 is opened. This prevents the process liquid from being flushed into the pulp reservoir.
  • the drain openings 71 are closed and the rinsing process is ended.
  • the interior of the mold i.e. the cavity 74 and the cavity 72, is again filled with process liquid 95, as shown in FIG. 2A.
  • the branch 76 can be closed and new pulp can be added to the liquid supply by opening the inlet valve 75.
  • the wet fiber-based blank 60 is removed from the mold 70 using a suitable transfer device.
  • the mold 70 is opened.
  • the wet fiber-based blank 60 is then placed into the opened mold 20, which is designed in two parts.
  • Figure 3 shows a device 200 for reducing the water content in a fiber-based blank before exposure to microwaves.
  • the fiber-based blank 60 in the present case is a container in the form of a bottle.
  • This process is the drying step. In the present case, this is carried out using microwave radiation. This step is described below with reference to the device 200.
  • the device 200 has a microwave chamber 40 which is closed with a lid 41. In the lid 41 there is an exhaust opening 42 through which compressed air and / or moisture, such as water or water vapor, can be removed.
  • the microwave chamber 40 also has a floor 43. A large number of openings 44 are arranged in the floor through which supply air can be introduced into the microwave chamber 40.
  • the device 200 also has a device 50 for generating microwaves. In the present case, this is designed as a magnetron.
  • the device 50 for generating microwaves is connected to the microwave chamber 40 with a waveguide 51.
  • the waveguide 51 is rectangular.
  • a press mold 20 is arranged within the microwave chamber 40.
  • a wet fiber-based blank 60 is arranged within the press mold 20. This was removed from a casting mold before being placed in the press mold 20 and currently has a water content of approximately 75%. After placing the wet fiber-based blank 60 into the mold 20, an expandable tool 30 was placed inside the wet fiber-based container 100.
  • the wall of the blank 60 is pressed onto the inner wall of the press mold 20 and the water in the wet fiber-based blank 60, or the moisture therein, is partially pressed out of it.
  • the press mold 20 is designed to be water-permeable. Water permeability can be achieved with porosity; alternatively, individual channels or openings can be provided in the press mold. The water can also be drained away through gaps or openings at the separation point of the press mold. The escaping water, or the escaping moisture, is shown stylized by water drops in the illustration according to FIG. These water drops can drip onto the bottom 43 of the microwave chamber and be discharged through the openings 44. After this step, the fiber-based container 100 has a water content of approximately 50%.
  • FIG 4 shows the device according to Figure 3 during the exposure of the wet fiber-based blank 60 to microwaves.
  • Figure 4 shows the actual drying process.
  • Microwaves are correspondingly generated in the device 50 for generating microwaves and are introduced into the microwave chamber 40 through the waveguide 51 .
  • the microwaves heat up the moisture contained in the fiber-based blank 60, in other words, the molecules begin to vibrate.
  • the moisture begins to evaporate and emerges from the blank 60 through the microwave-permeable press mold 20.
  • 4 shows the expandable tool 30 in the non-expanded state, but it is possible for the expandable tool 30 to remain expanded even during the process shown here.
  • the moisture shown here stylized by wavy lines, enters the microwave chamber 40.
  • the press mold 20 is provided with a moisture-dissipating channel, into which a gap opens, which is arranged on or in the mold separation plane of the press mold 20.
  • the moisture does not come out of the mold 20 and into the microwave chamber 40 as shown, but is collected in the moisture-removing channel. Accordingly, the moisture can be removed directly from the press mold 20 to outside the microwave chamber 40. Corresponding exhaust openings of the microwave chamber 40 are then connected directly to the moisture-removing channel.
  • a holding device for the microwave-permeable press mold 20 is designed as an integral part of the lid 41.
  • the device 200 is designed in two parts, i.e. consists of two halves and, if necessary, a separate base.
  • the press mold 20 can be held and pressed together by appropriate elements on the respective halves of the device 200.
  • the now dried blank 61 is removed from the press mold 20. This will be opened for this purpose.
  • a suitable transfer device for example a gripper
  • the dried blank 61 is fed to a device for assembly and the dried blank is assembled accordingly. This step is explained below with reference to a cutting device 400.
  • FIG. 5 shows a perspective view of a cutting device 400.
  • the cutting device 400 includes a holding device 450 for holding a dried blank 61.
  • the cutting device 400 also includes a cutting laser 420 which, in the present case, is arranged in a fixed location on the cutting device 400.
  • the support 432 can be moved vertically along the longitudinal axis X.
  • feeding devices for feeding the dried blanks 61 and for removing the dried blanks 61 are not shown.
  • Figure 6 shows a sectional view through the cutting device 400 according to Figure 5.
  • the cut extends transversely Longitudinal extension of the laser 420 through the longitudinal axis X.
  • the holding device 450 is arranged, by means of which a dried blank 61 is held in the cutting device 400.
  • a deflection device 430 for guiding the laser beam 421 is arranged on the pivot bearing 431.
  • the laser beam 421 is generated by the laser 420.
  • the laser beam 421 is generated in such a way that it radiates essentially on the output side of the laser 420 in the direction of the longitudinal axis X.
  • the laser beam 421 is deflected by means of the deflection device 430 so that it is directed essentially at right angles to the dried blank 61. This will be explained in detail below with reference to FIG. 7.
  • the pivot bearing 431 is arranged such that the deflection device 430 is movable about the longitudinal axis X, with the longitudinal axis X and the center of rotation essentially lying one above the other.
  • the deflection device comprises individual tubes 424, 425, 426 and 427, each of which is arranged at an angle to one another. At the respective interfaces of the individual tubes, deflecting mirrors 423 for deflecting the laser beam 421 are arranged within the tubes. Their function is explained below with reference to FIG. 7.
  • the tube 424 of the deflection device 30 is variable in size, so that the support can be moved vertically together with the pivot bearing 431 and the remaining elements of the deflection device 430.
  • the length of the tube 425 of the deflection device 430 is also variable, so that a radial distance between the tubes 426 and 427 with respect to the longitudinal axis X can be adjusted.
  • Figure 7 shows a detailed view of Figure 6.
  • deflection mirrors 422 are arranged in the deflection device 430.
  • a security element 423 is arranged for each deflection mirror 422, which in the present case is designed as a metal plate.
  • a focusing optics 440 is arranged on the deflection device 430 for focusing the laser beam and subsequently an exit nozzle 428 in the beam direction.
  • the radial distance of the deflection device, or the elements of the deflection device, following the pivot bearing 431 is adjustable.
  • an actuator 433 is arranged below the pivot bearing 431.
  • the distance between the focusing optics 440 and the longitudinal axis X can be adjusted. This makes it possible to set a distance of the focal point of the laser beam 421 in relation to the surface of the supernatant 62 to be separated (see FIG. 8).
  • the deflection device 430 forms a substantially closed system into which a purge gas can be introduced, which flows through the outlet nozzle 428 during operation.
  • the holding device 450 is also visible in the illustration according to FIG. This has two grippers 451 and 452, which hold a dried blank 61 from two sides.
  • a flushing device 480 is introduced into the dried blank 61, through which a flushing gas can be introduced into the interior of the dried blank 61. During operation or during the cutting process, the introduction of purging gas can prevent dirt or dust particles from settling inside the dried blank 61.
  • Integrally formed in the flushing device 480 is a second suction device 481, which suctions off the flushing gas introduced into the dried blank 61 together with any dirt particles contained therein above the dried blank 61, or above an opening in the dried blank 61.
  • a first suction device 460 is arranged outside the dried blank 61, specifically in the area of the outlet nozzle 28. The first suction device 460, on the one hand, sucks away dirt and dust particles that form outside the dried blank 61, and on the other hand, at least one Part of the purge gas from the deflection device 430 is collected again.
  • FIG. 7 shows the cutting device 400 during operation. Before this state is reached, both the deflection device 430 and the first suction device 460 and the rinsing device 480 are arranged vertically above the dried blank 61. All of these elements are attached together to the pivot bearing 431 and can be moved vertically with the support 432.
  • these aforementioned elements are moved in the vertical direction towards the dried blank 61, during the vertical movement the pivot bearing 431 together with the deflection device 430 and all on the pivot bearing 431 arranged elements begin to rotate about the longitudinal axis X.
  • the laser is also started up at this point in time, so that it already reaches its preset power during the vertical displacement process and also during the rotation and shoots through the dried blank 61 above the final cutting edge 65 (see FIG. 8).
  • the rotary bearing 431 is moved by a further 360° and then the support 433 is moved upwards again in the vertical direction and the laser 420 is then switched off.
  • a protective plate is also shown opposite the outlet nozzle 428, which prevents the uncontrolled spread of the laser beam in the event of failure.
  • Figure 8 shows a perspective view of a dried blank 61.
  • the dried blank 61 is shown cut so that the view becomes clear of the cut edge 65. The cut therefore only extends through the excess projection 62.
  • the cutting edge 65 forms a final upper edge or upper opening of the dried blank 61, onto which a corresponding cover can be applied.
  • the dried blank 61 which is now assembled and is therefore already in the form of a fiber-based product, can be sent to further processing steps.
  • the interior of the dried blank 61 can be coated and/or the dried blank 61 can be fed to a filling system.
  • a coating step is explained below with reference to FIG. 9.
  • the now assembled blank 61 is fed to a powder coating system, not shown here.
  • an electrostatically charged lance 35 is introduced into the finished blank 61. This is located in an oppositely charged envelope which is also not shown here. Due to the electrostatic charge of the dispensed powder, it sticks to the inside 63 of the finished blank 61.
  • the now coated finished blank 61 is, as can be seen in FIG. 10, transferred into an oven and subjected to thermal energy. This causes the powder coating to melt, creating a continuous, homogeneous film. The blank 61 is thus sealed.
  • the blank 61 can then be tested for leaks using a corresponding testing device 500, as shown in Figure 11.
  • FIG. 13 shows examples of further typical fiber-based products that can be produced using the method described here.
  • a container 100 is shown in the form of a bottle. This also has a thread on the bottle neck.
  • the container 100' is in the form of a bowl, the container 100'' is in the form of a cup.
  • FIG. 14 shows an example of a typical fiber-based closure 300 that can be produced using the method described here.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Paper (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un produit à base de fibres à partir de pâte de bois, en particulier un récipient ou un élément de fermeture à base de fibres pour un récipient. Le procédé comprend les étapes suivantes: l'utilisation d'un moule; l'introduction de pâte dans le moule de sorte qu'une préforme à base de fibres humides (60) est formée; le séchage de la préforme à base de fibres humides; la découpe de la préforme séchée (61) à dimension par découpe d'une longueur excédentaire (62).
PCT/EP2023/073535 2022-08-30 2023-08-28 Procédé de fabrication d'un produit à base de fibres à partir de pâte de bois Ceased WO2024046984A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202380062245.4A CN119790201A (zh) 2022-08-30 2023-08-28 由纸浆制造基于纤维的产品的方法
EP23764587.4A EP4581208A1 (fr) 2022-08-30 2023-08-28 Procédé de fabrication d'un produit à base de fibres à partir de pâte de bois

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CHCH001009/2022 2022-08-30
CH001009/2022A CH719997A9 (de) 2022-08-30 2022-08-30 Verfahren zur Herstellung eines faserbasierten Produktes aus Pulpe.

Publications (1)

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WO2024046984A1 true WO2024046984A1 (fr) 2024-03-07

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PCT/EP2023/073535 Ceased WO2024046984A1 (fr) 2022-08-30 2023-08-28 Procédé de fabrication d'un produit à base de fibres à partir de pâte de bois

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Country Link
EP (1) EP4581208A1 (fr)
CN (1) CN119790201A (fr)
CH (1) CH719997A9 (fr)
WO (1) WO2024046984A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012139590A1 (fr) 2011-04-15 2012-10-18 Ecoxpac A/S Récipient
EP1266998B1 (fr) * 2000-02-17 2014-07-02 Kao Corporation Procede de fabrication d'un corps forme par moulage de pulpe agglomeree

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1266998B1 (fr) * 2000-02-17 2014-07-02 Kao Corporation Procede de fabrication d'un corps forme par moulage de pulpe agglomeree
WO2012139590A1 (fr) 2011-04-15 2012-10-18 Ecoxpac A/S Récipient

Also Published As

Publication number Publication date
CH719997A1 (de) 2024-03-15
EP4581208A1 (fr) 2025-07-09
CH719997A9 (de) 2024-05-31
CN119790201A (zh) 2025-04-08

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