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WO2023232996A1 - Moule de presse pour recevoir une ébauche à base de fibres, et procédé pour réduire la teneur en eau dans une ébauche à base de fibres - Google Patents

Moule de presse pour recevoir une ébauche à base de fibres, et procédé pour réduire la teneur en eau dans une ébauche à base de fibres Download PDF

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Publication number
WO2023232996A1
WO2023232996A1 PCT/EP2023/064816 EP2023064816W WO2023232996A1 WO 2023232996 A1 WO2023232996 A1 WO 2023232996A1 EP 2023064816 W EP2023064816 W EP 2023064816W WO 2023232996 A1 WO2023232996 A1 WO 2023232996A1
Authority
WO
WIPO (PCT)
Prior art keywords
press mold
mold
moisture
blank
fiber
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/EP2023/064816
Other languages
German (de)
English (en)
Inventor
Christian Preiss
Florian MÜLLER
Shaikh WASEEM
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
Priority claimed from CH000680/2022A external-priority patent/CH719750A1/de
Priority claimed from CH001008/2022A external-priority patent/CH719996A9/de
Application filed by Alpla Werke Alwin Lehner GmbH and Co KG filed Critical Alpla Werke Alwin Lehner GmbH and Co KG
Priority to US18/870,163 priority Critical patent/US20250341060A1/en
Priority to EP23729425.1A priority patent/EP4532836A1/fr
Priority to CN202380043948.2A priority patent/CN119301326A/zh
Publication of WO2023232996A1 publication Critical patent/WO2023232996A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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

Definitions

  • the present invention relates to a press mold for receiving a fiber-based blank, in particular for receiving a container or a fiber-based closure element, and a method for reducing the water content in a fiber-based blank, in particular in a container or in a fiber-based closure element for a container according to the Preamble of independent claims.
  • a fiber-based blank in the form of a container was disclosed 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. It is also known to produce closure elements for containers from pulp.
  • 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 aforementioned process is time-consuming and energy-intensive. It has therefore already been suggested to improve this.
  • WO 2018/020219 Al another method became known for drying wet, fiber-based blanks.
  • the blanks are containers.
  • the wet pulp is also placed inside the mold using a flexible balloon pressed together.
  • the container pre-processed in this way is then removed from the mold together with the balloon inside and placed on a conveyor belt.
  • the balloon is removed from the cold formed container.
  • the container is then exposed to microwaves to dry it.
  • the blank is very sensitive to force before drying and must be handled very carefully.
  • the container can deform, for example due to uneven drying or caused by a non-uniform layer thickness, or it can be damaged by external influences.
  • a device and a method are to be provided which make it possible to dry wet fiber-based blanks, in particular containers such as bottles, cups, bowls or trays or wet fiber-based closure elements, with little energy expenditure and thereby ensure that they remain dimensionally accurate.
  • a device is provided by a press mold for receiving a fiber-based blank.
  • the fiber-based blank can in particular be a container or a fiber-based closure element for a container.
  • the press mold is intended for use in a microwave chamber.
  • the press mold is microwave-permeable. When the press mold is closed, at least one gap is formed within the press mold through which moisture can escape.
  • the wet fiber-based blank By providing 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 already known in the art.
  • 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 the fibers of the pulp are washed up, so that a wall of a blank is built 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. After insertion, the press form is closed.
  • 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 at least one gap on the press mold allows the displaced moisture, which in the present case is essentially water, to escape from the press mold.
  • the press mold it is not necessary to design the press mold as such to be water-permeable. On the one hand, this makes it possible to produce the surfaces of the press mold with a higher quality, and on the other hand, any pores or channels in the press mold do not have to be laboriously cleaned after the press mold has been used.
  • the moisture can also be specifically removed through a gap, or the areas in which the moisture is removed can be specifically selected.
  • the gap also enables the removal of in a later step, namely when exposed to microwaves Humidity .
  • the moisture is typically in the form of vapor.
  • a gap in the sense of the present description is an opening with an elongated dimension.
  • the opening has a length whose dimension is several times larger than the dimension of the width, in particular more than twenty times.
  • a gap is also arranged in such a way that moisture can escape from the inside of the mold, i.e. from a cavity, to the outside.
  • the gap is an opening that provides a passage arranged radially in relation to a longitudinal axis of the mold.
  • the at least one gap is formed in a region of the mold that corresponds to a region on the fiber-based blank that is removed before using a product made from the fiber-based blank. Provision can be made to arrange additional columns on the press mold.
  • the gap can leave machining marks on the surface of the blank. If the gap is formed in an area that will later be separated from the blank, this fact remains unimportant. Any changes to the surface are not visible on the finished product because these areas are separated accordingly.
  • the at least one gap is formed on an area of the press mold that corresponds to a neck of the blank.
  • the neck of the blank can be made correspondingly longer in relation to the finished product and the protruding area can be easily separated.
  • the press mold can be designed in two or more parts. Accordingly, it has one or more mold separation planes. It can be provided that the gap is formed on at least one of the mold parting planes. This is an alternative or addition to a gap in an area that is later separated from the blank, as described herein.
  • the formation of the gap on a mold parting plane enables the gap to be manufactured easily, since the mold parting plane is easily accessible with tools during production.
  • a gap located on the mold parting plane can be cleaned easily and inexpensively.
  • the mold separation plane of the press mold extends in the same area as a corresponding mold separation plane of a casting mold, corresponding defects that arise on the blank after casting can be recorded in the press mold at the same location. This means that the blank is not put under unnecessary strain.
  • the press mold halves do not touch each other in the area of the cavity, i.e. on the inner wall of the cavity, but are in contact with each other through the gap.
  • this gap can widen and form a channel which becomes narrower again as the radial distance to a center of the mold increases.
  • the two halves of the mold then lie on top of each other so that the channel is closed.
  • the mold parting planes towards the inside of the press mold form the gap.
  • the at least one gap is formed circumferentially along the entire mold parting plane.
  • the gap increases the opening cross-section through which moisture can escape.
  • the entire blank is also essentially accessible from all sides. This is also advantageous because a visible mark will appear on the product in this area due to the casting process. By arranging the gap in the same place, an additional editing mark can be prevented.
  • the press mold is designed in two parts in the area of a container body and additionally has a separate one-piece shoulder area and/or a separate one-piece bottom area.
  • the at least one gap can open into a moisture-dissipating channel which is arranged within a wall of the press mold.
  • the gap can spread and expand/enlarge towards the press mold, so that a corresponding channel is formed. Moisture can be removed within this moisture-removing channel.
  • a corresponding channel By providing a channel, it can be ensured that even larger amounts of moisture can be removed without causing a blockage to form in the area of the gap.
  • a corresponding channel also makes it possible to create a forced flow to remove moisture.
  • the at least one gap can have a width of 0. 04mm to 0. 1 mm, especially up to 0. 4 mm, have .
  • the preferred width is from 0 . 6mm to 0. 25mm.
  • the length of the gap is many times larger, preferably at least 20 times, preferably 100 times, than its width, in particular the length of the gap extends along the press mold over at least 25% of the inner contour, preferably axially Direction, i.e. in the direction of the longitudinal axis of the press form, or of the fiber-based blank formed therein.
  • the moisture-removing channel can be connected to a device for generating a negative pressure or an overpressure, so that a specific flow can be created in the moisture-removing channel. This allows the moisture to be removed more quickly and in a more targeted manner.
  • Openings can open into the moisture-draining channel, or holes or channels that have a direct connection to the outside, so that the moisture can be drained away more quickly.
  • appropriate channels enable also the removal of moisture at specific points of the moisture-removing channel, so that the moisture removal can be accelerated in preferred areas.
  • the press mold can have a substantially uniform wall thickness. This ensures that the blank in the press mold is essentially uniformly exposed to microwaves and that these have a correspondingly uniform effect on the blank.
  • Support elements can also be provided on the press mold in order to support the press mold.
  • a press mold as described here is relatively thin-walled and/or made of at least partially elastic materials. Deformation of the press mold can be prevented using appropriate support elements.
  • 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.
  • a method for reducing the water content in a fiber-based blank, in particular in a fiber-based container or a fiber-based closure element for a container comprises the steps:
  • the fiber-based blank is preferably provided in a microwave-permeable mold.
  • the wet fiber-based blank After being prepared in the press mold, the wet fiber-based blank is preferably exposed to microwaves.
  • the expandable tool remains in the expanded state during exposure to microwaves.
  • the blank is exposed to microwaves when the expandable tool is pressurized and expanded.
  • the moisture contained in the fibers can be brought into a vapor phase so that it can escape from the fibers.
  • This vaporous or gaseous phase is preferably removed through the at least one gap.
  • the moisture is removed with a forced flow. Forced flow can accelerate the removal of moisture.
  • the forced flow allows the moisture to be removed in particular from the microwave chamber.
  • a moisture-dissipating channel can be provided in the press mold, into which the at least one gap opens.
  • the flow can be generated by negative pressure or by positive pressure.
  • An area of the blank into which the at least one gap of the press mold opens can be separated from the blank after reducing the water content or moisture. Accordingly, any marks created can be removed from the finished product so that it has a uniform surface.
  • Openings can open into the moisture-draining channel, or holes or channels that have a direct connection to the outside, so that the moisture can be drained away more quickly.
  • appropriate openings also enable the removal of moisture at specific points of the moisture-removing channel, so that moisture removal can be accelerated in preferred areas.
  • the channel can be formed in the area of a parting plane.
  • 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.
  • molecules can be stimulated to oscillate by stimulation with microwaves and that this oscillation creates heat.
  • Water for example, has a natural frequency of 2.45 GHz. The microwaves are therefore preferably generated at this frequency.
  • the water is preferably excited and thus heated until it evaporates and accordingly diffuses out of the wet blank.
  • the press mold and/or the microwave chamber is preheated to a temperature that is higher than 60 °C but preferably lower than 160 °C.
  • the heating or preheating of the press mold and/or the microwave chamber can be carried out, for example, using conventional resistance heaters. 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
  • An additional or alternative way of preheating the mold could, for example, also occur through intentional, partial absorption of the microwave radiation in the mold itself in the order of a maximum of 10%, preferably a maximum of 5% of the microwave radiation, or by Energy release of the steam generated during drying to the press mold.
  • the moisture can be water vapor but also water in its liquid form.
  • the forced air flow can also or alternatively be formed in this channel.
  • the moisture within the device can be kept low and condensation of the moisture or renewed heating of the moisture, for example water drops by microwave radiation, can be prevented or at least reduced.
  • the energy input into the wet fiber-based blank becomes more uniform and overheating of individual parts of the blank can be avoided.
  • the blanks can each be rotated around their own axis and/or around a common axis. This enables the More efficient use of microwaves 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.
  • the microwaves can be applied 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 press mold can be porous or solid with water-draining channels or made of a fine-mesh material.
  • the method and the press mold, as described here, are preferably used in a combination with a device for reducing the water content in a fiber-based blank, in particular for reducing the water content in a fiber-based blank, as described here.
  • the device has a microwave chamber for introducing a wet fiber-based container and at least one device for generating microwaves.
  • the device also has a device for supplying and removing media from the microwave chamber. In particular, this involves the supply and removal of compressed air and moisture.
  • One or more devices for supplying and removing media can be arranged in such a way that, when used according to the invention, they are connected to the moisture-dissipating channel of the press mold.
  • the device for generating microwaves can be connected to the microwave chamber by means of a waveguide.
  • the device for generating microwaves can be arranged at a spatial distance from the microwave chamber and the microwave radiation generated by this device can be introduced into the microwave chamber in a targeted manner.
  • the waveguide preferably has a rectangular cross section, with its longer side typically in Direction of a longitudinal axis of the microwave chamber is aligned.
  • the longitudinal axis of the microwave chamber essentially corresponds to the longitudinal axis of the fiber-based blank or container. This is determined by a connection between a base of the blank and a pouring opening of the blank or the container.
  • openings can be arranged along the waveguide, which are connected to the microwave chamber and through which the microwaves can propagate into the microwave chamber. This enables a reduced size of the entire unit.
  • the device can have a lid for closing the microwave chamber.
  • an exhaust air opening can be arranged in the lid. This opening therefore corresponds to a device for supplying and removing a medium from the microwave chamber, in particular compressed air and moisture.
  • a lid allows the microwave chamber to be easily closed and the exhaust air opening to be precisely aligned, so that a targeted air flow can be generated within the device, i.e. within the microwave chamber.
  • the microwave chamber can be divided so that the microwave chamber consists of two identical housing parts or housing parts of different sizes and shapes. It can be provided that one press mold half is assigned to each half of the microwave chamber. For example, each press mold half can be connected to a corresponding half of the microwave chamber.
  • the microwave chamber can additionally or alternatively have a bottom.
  • a large number of openings are arranged in the base for supplying air to the microwave chamber. These openings therefore correspond to a device for supplying and removing a medium from the microwave chamber, in particular compressed air and moisture.
  • Such openings can also be designed as an integral part of the press mold.
  • the bottom of the microwave chamber can simultaneously form part of the press mold, in particular a bottom of the press mold.
  • This bottom of the press mold preferably ends in a microwave-tight tube. On the one hand, this prevents microwaves from escaping from the microwave chamber, and on the other hand, it simultaneously enables the removal of moisture and/or the supply of compressed air to create a forced flow.
  • the device for reducing the water content in a fiber-based container has several devices for generating microwaves.
  • Each of the plurality of devices for generating microwaves may be connected to the microwave chamber with a waveguide.
  • the individual devices for generating microwaves can therefore introduce their generated microwave radiation into the microwave chamber at different points.
  • each of the devices can be controlled separately and emit microwave radiation with a different power.
  • the drying of the blank can be carried out in a targeted manner, with different power being applied to it at different points if necessary can be made so that the overall drying process is even. In this case, uniform means that the wet fiber-based container reaches a predefined water content, which is achieved simultaneously across the entire container.
  • the waveguides are arranged at different angles and/or along the longitudinal axis at different heights and/or in relation to the longitudinal axis with different orientations of the longer side of the respective rectangular cross section of the waveguide.
  • the device preferably has a holding device for the microwave-permeable mold.
  • the microwave-permeable press mold can thus be arranged and/or supported within the device, in particular within the microwave chamber.
  • the device has several holding devices in order to hold several molds in the microwave chamber at the same time. This reduces the cycle time and enables more efficient use of the microwaves.
  • the holding devices can each be designed to rotate about their own axis and/or about a common axis. This enables the microwaves to be used more efficiently and enables a more even energy input into the blanks.
  • the holding device can also be designed in such a way that it is attached to the press mold with appropriate support elements is in operative connection so that the press mold is evenly supported and is not deformed.
  • a blank can be designed as a container, in particular as a bottle, bowl, cup, (coffee) capsule, tray or can. It is also possible to produce closures for containers using the method according to the invention and the device according to the invention.
  • Figure 1 A device with a press mold before exposure to microwaves
  • Figure 2 the device according to Figure 1 during exposure to microwaves
  • Figure 3 a perspective view of a press mold in an alternative device
  • Figure 4 a sectional view through a press mold
  • Figure 5 a perspective view of an alternative
  • Figure 6 a perspective view of an alternative
  • Figure 7 a perspective view of an alternative
  • Figure 8 exemplary further typical fiber-based containers that can be produced using the method according to the invention
  • 9 shows an example of a typical fiber-based closure that can be produced using the method according to the invention.
  • Figure 1 shows a device 200 for reducing the water content in a fiber-based blank before exposure to microwaves.
  • the fiber-based blank is a container 100 in the form of a bottle.
  • the device 200 has a microwave chamber 40 which is closed with a lid 41.
  • 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.
  • 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 container 100 is disposed within the 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 container 100 into the mold 20, an expandable tool 30 was placed inside the wet fiber-based container 100.
  • the wall of the container 100 is pressed onto the inner wall of the press mold 20 and the water in the wet fiber-based container 100, or the moisture in it, is partially pressed out of it.
  • the press form 20 is used for this purpose water-permeable. Water permeability can be achieved with porosity; in this case, individual channels or openings are provided in the form of a gap in the press mold. The water can therefore 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.
  • the fiber-based container 100 has a water content of approximately 50%.
  • FIG 2 shows the device according to Figure 1 during the exposure of the wet fiber-based container 100 to microwaves.
  • Figure 2 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 container 100, in other words, the molecules begin to vibrate.
  • the moisture begins to evaporate and exits the container 100 through the microwave-permeable mold 20.
  • the expandable tool 30 is shown 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.
  • a holding device for the microwave-permeable 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 on the respective halves of the device 200 by appropriate elements.
  • a corresponding training is shown in Figure 3.
  • Figure 3 shows a perspective view of a press mold 20 in an alternative device 200.
  • a press mold 20 is arranged within the device 200.
  • the press mold 20 is designed in three parts. Shown is a first half of the press mold 20A, which is connected at a mold parting plane T to a second half of the press mold 20B (see Figure 4), not shown here.
  • a base part 24 is arranged which has a mold separation plane to both mold halves 20A and 20B of the mold 20.
  • the device 200 has, analogous to FIG. 1, a microwave chamber 40 which is closed with a lid 41.
  • the upper end of the mold 20 extends through the cover 41.
  • the bottom 24 of the mold 20 also forms the bottom end of the microwave chamber 40.
  • the base part 24 merges into a microwave-tight tube 25.
  • Figure 3 shows the mold separation plane on the press mold half 20A with a moisture-dissipating channel 22 arranged therein, which opens into a gap 21 (see Figure 4), which is not specified here.
  • openings 23 open into the moisture-removing channel 22 through which the moisture collected in the channel 22 can be removed.
  • the channel 22 can also be pressurized through these openings 23.
  • openings 23 in the base 24 can also be seen.
  • the openings 23 also open into a moisture-dissipating channel 22 which is arranged in the area of the mold parting plane between the base part 24 and the press mold halves 20A and 20B in the base part 24.
  • the channel 22 is arranged circumferentially in the base part 24.
  • the channel 22 in the press mold half 20A is also designed to run along the entire mold parting plane and opens into a corresponding gap.
  • Moisture can also be removed through the openings 23 on the bottom 24 and/or the channel 22 can be pressurized.
  • Figure 4 shows a detail of a sectional view through the press mold 20 from Figure 3.
  • the sectional view extends parallel to the mold parting plane between the base 24 and the mold halves 20A and 20B (see FIG. 3).
  • Visible and shown in the figure are the two press mold halves 20A and 20B, which rest against one another along the mold parting plane T. It can be seen that the two press mold halves 20A and 20B form a cavity for receiving a corresponding blank.
  • a gap 21 is formed on the mold parting plane in the area of the cavity, which opens into a moisture-dissipating channel 22 in the direction into the press mold 20, i.e. into a wall of the press mold 20.
  • Both the gap 21 and the channel 22 are each formed in half in the mold halves 20A and 20B.
  • the interior of the mold i.e. the cavity, is connected to the channel 22 in a radially outward direction through the gap 21.
  • the mold halves 20A and 20B lie close to one another in the same direction behind the channel 22.
  • All molds 20 have two mold halves 20A and 20B (not shown) and a base 24.
  • the bottom 24 opens into a microwave-tight tube 25.
  • the bottom 24 is designed identically to the bottom 24 described in FIG. 3.
  • the moisture removal channel 22 in the mold half 20A has no further openings.
  • the moisture-dissipating channel 22 has openings 23 in an upper region. These correspond to the openings 23 which are described in FIG.
  • the embodiment according to Figure 6 corresponds to that according to Figure 3.
  • the embodiment according to Figure 7 corresponds in relation to the moisture-dissipating channel
  • FIG 8 shows, by way of example, further typical fiber-based containers that can be produced using the method described here.
  • a container 100 can be seen, which corresponds to the container 100 from the description of Figures 1 and 2.
  • This container 100 is also in the shape of a bottle and 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. 9 shows an example of a typical fiber-based closure 300 that can be produced using the method described here.

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Abstract

L'invention concerne un moule de presse (20) pour recevoir une ébauche à base de fibres, en particulier un récipient (100, 100', 100'') ou un élément de fermeture à base de fibres (300) pour un récipient (100), destiné à être utilisé dans une chambre à micro-ondes (40). Le moule de presse (20) est perméable aux micro-ondes, et au moins un espace (21) à travers lequel l'humidité peut s'échapper est formé sur le moule de presse (20) dans l'état fermé du moule de presse (20). L'invention concerne en outre un procédé de réduction de la teneur en eau dans une ébauche à base de fibres.
PCT/EP2023/064816 2022-06-03 2023-06-02 Moule de presse pour recevoir une ébauche à base de fibres, et procédé pour réduire la teneur en eau dans une ébauche à base de fibres Ceased WO2023232996A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US18/870,163 US20250341060A1 (en) 2022-06-03 2023-06-02 Press mold for receiving a fiber-based blank, and method for reducing the water content in a fiber-based blank
EP23729425.1A EP4532836A1 (fr) 2022-06-03 2023-06-02 Moule de presse pour recevoir une ébauche à base de fibres, et procédé pour réduire la teneur en eau dans une ébauche à base de fibres
CN202380043948.2A CN119301326A (zh) 2022-06-03 2023-06-02 用于装填纤维质坯料的压模和一种降低纤维质坯料含水量的方法

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CH000680/2022A CH719750A1 (de) 2022-06-03 2022-06-03 Verfahren und Vorrichtung zur Reduktion des Wassergehaltes in einem faserbasierten Rohling.
CHCH000680/2022 2022-06-03
CH001008/2022A CH719996A9 (de) 2022-08-30 2022-08-30 Pressform zur Aufnahme eines faserbasierten Rohlings und Verfahren zur Reduktion des Wassergehaltes in einem faserbasierten Rohling.
CHCH001008/2022 2022-08-30

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WO2023232996A1 true WO2023232996A1 (fr) 2023-12-07

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EP (1) EP4532836A1 (fr)
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19736642A1 (de) * 1997-06-10 1999-01-07 Daewon Paptin Foam Co Verfahren zur Herstellung von einem Dämpfungs- und Wärmeisolationsmaterial aus geschäumtem zellulosehaltigen Stoff
US7074302B2 (en) * 2003-12-05 2006-07-11 Sonoco Development, Inc. Apparatus and process for forming three-dimensional fibrous panels
WO2011157999A2 (fr) * 2010-06-18 2011-12-22 Greenbottle Limited Procédé et appareil de formation d'un article à partir de pâte cellulosique
WO2012139590A1 (fr) 2011-04-15 2012-10-18 Ecoxpac A/S Récipient
WO2018020219A1 (fr) 2016-07-26 2018-02-01 Natural Resources (2000) Limited Moulage d'articles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19736642A1 (de) * 1997-06-10 1999-01-07 Daewon Paptin Foam Co Verfahren zur Herstellung von einem Dämpfungs- und Wärmeisolationsmaterial aus geschäumtem zellulosehaltigen Stoff
US7074302B2 (en) * 2003-12-05 2006-07-11 Sonoco Development, Inc. Apparatus and process for forming three-dimensional fibrous panels
WO2011157999A2 (fr) * 2010-06-18 2011-12-22 Greenbottle Limited Procédé et appareil de formation d'un article à partir de pâte cellulosique
WO2012139590A1 (fr) 2011-04-15 2012-10-18 Ecoxpac A/S Récipient
WO2018020219A1 (fr) 2016-07-26 2018-02-01 Natural Resources (2000) Limited Moulage d'articles

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CN119301326A (zh) 2025-01-10
US20250341060A1 (en) 2025-11-06

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