WO2023232995A1 - Verfahren und vorrichtung zur reduktion des wassergehaltes in einem faserbasierten rohling - Google Patents
Verfahren und vorrichtung zur reduktion des wassergehaltes in einem faserbasierten rohling Download PDFInfo
- Publication number
- WO2023232995A1 WO2023232995A1 PCT/EP2023/064815 EP2023064815W WO2023232995A1 WO 2023232995 A1 WO2023232995 A1 WO 2023232995A1 EP 2023064815 W EP2023064815 W EP 2023064815W WO 2023232995 A1 WO2023232995 A1 WO 2023232995A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fiber
- microwaves
- microwave
- microwave chamber
- based blank
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
- F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
- F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
- F26B11/0495—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis with provisions for drying by electro-magnetic means, e.g. radiation, microwaves
Definitions
- the present invention relates to a method and a device for reducing the water content in a fiber-based blank, in particular a container or in a fiber-based closure element for a container according to the preamble of the 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 inside the mold is also pressed together with a flexible balloon.
- 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 made from the Cold-formed container removed.
- 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 method and a device 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, while ensuring that they remain dimensionally accurate.
- a method according to the invention for reducing the water content in a fiber-based blank, in particular in a fiber-based container or closure element comprises the steps:
- the fiber-based blank is provided in a microwave-permeable mold.
- the wet fiber-based Blank By providing the fiber-based blank in a microwave-permeable mold, the wet fiber-based Blank remains within the mold during the drying process, i.e. during exposure to microwaves. The container is therefore protected against external influences and damage or deformation is prevented. 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 Form the fibers of the pulp are washed up, so that a wall of a container is built up. As soon as the wall is thick enough, the pulp washing stops.
- 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% at this point.
- 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. For removal and insertion, blowing out and/or suction using negative or positive pressure may be necessary be . 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 preferably introduced into the fiber-based blank.
- the water content of the fiber-based blank can be reduced in a first step.
- the wet fiber-based blank has a water content of approximately 50% - 60% at this point.
- the expandable tool remains in the expanded state during exposure to microwaves.
- 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 do not come directly from the wet fiber-based blank are absorbed, are typically reflected on the inner wall of the microwave chamber, so that this increases the probability that these microwaves will also hit the blank to be 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 can be preheated to a temperature that 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 in the press mold itself in the order of a maximum of 5% of the microwave radiation or through the energy release of the steam generated during drying to the press mold. Provision can be made to remove the moisture through a forced air flow.
- 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 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 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 can be achieved by applying 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 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.
- Such supply devices and discharge devices make it possible to generate a specific air flow within the microwave chamber, with which moisture that arises as a result of exposure to microwaves can be removed.
- 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 aligned in the direction of a longitudinal axis of the microwave chamber.
- 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 spread 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.
- 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.
- 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, whereby different power can be applied to it at different points, so that the overall drying process is uniform. 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 a microwave-permeable mold.
- the microwave-permeable press mold can thus be arranged 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.
- 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.
- FIG 1 A device before exposure to microwaves
- Figure 2 the device according to Figure 1 during exposure to microwaves
- Figure 3 exemplary further typical fiber-based containers that can be produced using the method according to the invention
- FIG. 4 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 can be used. 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 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 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 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 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.
- FIG 3 shows examples of 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. 4 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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Microbiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- Biomedical Technology (AREA)
- Biotechnology (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Paper (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP23728807.1A EP4532835A1 (de) | 2022-06-03 | 2023-06-02 | Verfahren und vorrichtung zur reduktion des wassergehaltes in einem faserbasierten rohling |
| CN202380043913.9A CN119301325A (zh) | 2022-06-03 | 2023-06-02 | 降低纤维质坯料含水量的方法和装置 |
| US18/870,143 US20250321051A1 (en) | 2022-06-03 | 2023-06-02 | Method and device for reducing the water content in a fibre-based blank |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH000680/2022A CH719750A1 (de) | 2022-06-03 | 2022-06-03 | Verfahren und Vorrichtung zur Reduktion des Wassergehaltes in einem faserbasierten Rohling. |
| CH000680/2022 | 2022-06-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2023232995A1 true WO2023232995A1 (de) | 2023-12-07 |
Family
ID=82019454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2023/064815 Ceased WO2023232995A1 (de) | 2022-06-03 | 2023-06-02 | Verfahren und vorrichtung zur reduktion des wassergehaltes in einem faserbasierten rohling |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20250321051A1 (de) |
| EP (1) | EP4532835A1 (de) |
| CN (1) | CN119301325A (de) |
| CH (1) | CH719750A1 (de) |
| WO (1) | WO2023232995A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4733015A1 (de) | 2024-10-23 | 2026-04-29 | Alpla-Werke Alwin Lehner GMBH & Co.KG | Greifvorrichtung |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999057373A1 (en) * | 1998-05-07 | 1999-11-11 | Kao Corporation | Formed body |
| WO2011158000A1 (en) * | 2010-06-18 | 2011-12-22 | Greenbottle Limited | Method and apparatus for forming an article from pulped material |
| WO2012139590A1 (en) | 2011-04-15 | 2012-10-18 | Ecoxpac A/S | Container |
| WO2018020219A1 (en) | 2016-07-26 | 2018-02-01 | Natural Resources (2000) Limited | Moulding of articles |
-
2022
- 2022-06-03 CH CH000680/2022A patent/CH719750A1/de unknown
-
2023
- 2023-06-02 CN CN202380043913.9A patent/CN119301325A/zh active Pending
- 2023-06-02 WO PCT/EP2023/064815 patent/WO2023232995A1/de not_active Ceased
- 2023-06-02 US US18/870,143 patent/US20250321051A1/en active Pending
- 2023-06-02 EP EP23728807.1A patent/EP4532835A1/de active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999057373A1 (en) * | 1998-05-07 | 1999-11-11 | Kao Corporation | Formed body |
| WO2011158000A1 (en) * | 2010-06-18 | 2011-12-22 | Greenbottle Limited | Method and apparatus for forming an article from pulped material |
| WO2012139590A1 (en) | 2011-04-15 | 2012-10-18 | Ecoxpac A/S | Container |
| WO2018020219A1 (en) | 2016-07-26 | 2018-02-01 | Natural Resources (2000) Limited | Moulding of articles |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4733015A1 (de) | 2024-10-23 | 2026-04-29 | Alpla-Werke Alwin Lehner GMBH & Co.KG | Greifvorrichtung |
Also Published As
| Publication number | Publication date |
|---|---|
| EP4532835A1 (de) | 2025-04-09 |
| CH719750A1 (de) | 2023-12-15 |
| CN119301325A (zh) | 2025-01-10 |
| US20250321051A1 (en) | 2025-10-16 |
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